1 $Cambridge: exim/doc/doc-txt/ChangeLog,v 1.207 2005/08/22 14:01:37 ph10 Exp $
3 Change log file for Exim from version 4.21
4 -------------------------------------------
9 TK/01 Added the "success_on_redirect" address verification option. See
10 NewStuff for rationale and an example.
12 PH/01 Added support for SQLite, basic code supplied by David Woodhouse.
14 PH/02 Patch to exigrep to allow it to work on syslog lines.
16 PH/03 When creating an mbox file for a virus/spam scan, use fseek() instead of
17 fread() to skip over the body file's header line, because in Cygwin the
18 header line is locked and is inaccessible.
20 PH/04 Added $message_exim_id, ultimately to replace $message_id (they will both
21 co-exist for some time) to make it clear that it is the Exim ID that is
22 referenced, not the Message-ID: header line.
24 PH/05 Replaced all Tom's calls to snprintf() with calls to the internal
25 string_format() function, because snprintf() does not exist on all
28 PH/06 The use of forbid_filter_existstest now also locks out the use of the
29 ${stat: expansion item.
31 PH/07 Changed "SMTP protocol violation: synchronization error" into "SMTP
32 protocol synchronization error", to keep the pedants happy.
34 PH/08 Arrange for USE_INET_NTOA_FIX to be set in config.h for AIX systems as
35 well as for IRIX systems, when gcc is being used. See the host.c source
38 PH/09 Installed latest Cygwin configuration files from the Cygwin maintainer.
40 PH/10 Named domain lists were not working if used in a queue_smtp_domains
43 PH/11 Added support for the IGNOREQUOTA extension to LMTP, both to the lmtp
44 transport and to the smtp transport in LMTP mode.
46 TK/02 Remove one case of BASE64 error detection FTTB (undocumented anyway).
48 PH/12 There was a missing call to search_tidyup() before the fork() in rda.c to
49 run a filter in a subprocess. This could lead to confusion in subsequent
50 lookups in the parent process. There should also be a search_tidyup() at
51 the end of the subprocess.
53 PH/13 Previously, if "verify = helo" was set in an ACL, the condition was true
54 only if the host matched helo_try_verify_hosts, which caused the
55 verification to occur when the EHLO/HELO command was issued. The ACL just
56 tested the remembered result. Now, if a previous verification attempt has
57 not happened, "verify = helo" does it there and then.
59 JJ/01 exipick: added $message_exim_id variable (see 4.53-PH/04)
61 TK/03 Fix log output including CR from clamd.
63 PH/14 A reference to $reply_address when Reply-to: was empty and From: did not
64 exist provoked a memory error which could cause a segfault.
66 PH/15 Installed PCRE 6.2
68 PH/17 Defined BIND_8_COMPAT in the Darwin os.h file.
70 PH/18 Reversed 4.52/PH/17 because the HP-UX user found it wasn't the cause
71 of the problem. Specifically, suggested +O2 rather than +O1 for the
74 PH/19 Added sqlite_lock_timeout option (David Woodhouse's patch).
76 PH/20 If a delivery was routed to a non-standard port by means of an SRV
77 record, the port was not correctly logged when the outgoing_port log
78 selector was set (it logged the transort's default port).
80 PH/21 Added support for host-specific ports to manualroute, queryprogram,
81 fallback_hosts, and "hosts" in the smtp transport.
83 PH/22 If the log selector "outgoing_port" is set, the port is now also given on
84 host errors such as "Connection refused".
86 PH/23 Applied a patch to fix problems with exim-4.52 while doing radius
87 authentication with radiusclient 0.4.9:
89 - Error returned from rc_read_config was caught wrongly
90 - Username/password not passed on to radius server due to wrong length.
92 The presumption is that some radiusclient API changes for 4.51/PH/17
93 were not taken care of correctly. The code is still untested by me (my
94 Linux distribution still has 0.3.2 of radiusclient), but it was
95 contributed by a Radius user.
97 PH/24 When doing a callout, the value of $domain wasn't set correctly when
98 expanding the "port" option of the smtp transport.
100 TK/04 MIME ACL: Fix buffer underrun that occurs when EOF condition is met
101 while reading a MIME header. Thanks to Tom Hughes for a patch.
103 PH/24 Include config.h inside local_scan.h so that configuration settings are
106 PH/25 Make $smtp_command_argument available after all SMTP commands. This means
107 that in an ACL for RCPT (for example), you can examine exactly what was
114 TF/01 Added support for Client SMTP Authorization. See NewStuff for details.
116 PH/01 When a transport filter timed out in a pipe delivery, and the pipe
117 command itself ended in error, the underlying message about the transport
118 filter timeout was being overwritten with the pipe command error. Now the
119 underlying error message should be appended to the second error message.
121 TK/01 Fix poll() being unavailable on Mac OSX 10.2.
123 PH/02 Reduce the amount of output that "make" produces by default. Full output
124 can still be requested.
126 PH/03 The warning log line about a condition test deferring for a "warn" verb
127 was being output only once per connection, rather than after each
128 occurrence (because it was using the same function as for successful
129 "warn" verbs). This seems wrong, so I have changed it.
131 TF/02 Two buglets in acl.c which caused Exim to read a few bytes of memory that
132 it should not have, which might have caused a crash in the right
133 circumstances, but probably never did.
135 PH/04 Installed a modified version of Tony Finch's patch to make submission
136 mode fix the return path as well as the Sender: header line, and to
137 add a /name= option so that you can make the user's friendly name appear
140 TF/03 Added the control = fakedefer ACL modifier.
142 TF/04 Added the ratelimit ACL condition. See NewStuff for details. Thanks to
143 Mark Lowes for thorough testing.
145 TK/02 Rewrote SPF support to work with libspf2 versions >1.2.0.
147 TK/03 Merged latest SRS patch from Miles Wilton.
149 PH/05 There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
150 with the definition in sysexits.h (which is #included earlier).
151 Fortunately, Exim does not actually use EX_OK. The code used to try to
152 preserve the sysexits.h value, by assumimg that macro definitions were
153 scanned for macro replacements. I have been disabused of this notion,
154 so now the code just undefines EX_OK before #including unistd.h.
156 PH/06 There is a timeout for writing blocks of data, set by, e.g. data_timeout
157 in the smtp transport. When a block could not be written in a single
158 write() function, the timeout was being re-applied to each part-write.
159 This seems wrong - if the receiver was accepting one byte at a time it
160 would take for ever. The timeout is now adjusted when this happens. It
161 doesn't have to be particularly precise.
163 TK/04 Added simple SPF lookup method in EXPERIMENTAL_SPF. See NewStuff for
164 details. Thanks to Chris Webb <chris@arachsys.com> for the patch!
166 PH/07 Added "fullpostmaster" verify option, which does a check to <postmaster>
167 without a domain if the check to <postmaster@domain> fails.
169 SC/01 Eximstats: added -xls and the ability to specify output files
170 (patch written by Frank Heydlauf).
172 SC/02 Eximstats: use FileHandles for outputing results.
174 SC/03 Eximstats: allow any combination of xls, txt, and html output.
176 SC/04 Eximstats: fixed display of large numbers with -nvr option
178 SC/05 Eximstats: fixed merging of reports with empty tables.
180 SC/06 Eximstats: added the -include_original_destination flag
182 SC/07 Eximstats: removed tabs and trailing whitespace.
184 TK/05 Malware: Improve on aveserver error handling. Patch from Alex Miller.
186 TK/06 MBOX spool code: Add real "From " MBOX separator line
187 so the .eml file is really in mbox format (even though
188 most programs do not really care). Patch from Alex Miller.
190 TK/07 MBOX spool code: Add X-Envelope-From: and X-Envelope-To: headers.
191 The latter is generated from $received_to and is only set if the
192 message has one envelope recipient. SA can use these headers,
193 obviously out-of-the-box. Patch from Alex Miller.
195 PH/08 The ${def test on a variable was returning false if the variable's
196 value was "0", contrary to what the specification has always said!
197 The result should be true unless the variable is empty.
199 PH/09 The syntax error of a character other than { following "${if
200 def:variable_name" (after optional whitespace) was not being diagnosed.
201 An expansion such as ${if def:sender_ident:{xxx}{yyy}} in which an
202 accidental colon was present, for example, could give incorrect results.
204 PH/10 Tidied the code in a number of places where the st_size field of a stat()
205 result is used (not including appendfile, where other changes are about
208 PH/11 Upgraded appendfile so that quotas larger than 2G are now supported.
209 This involved changing a lot of size variables from int to off_t. It
210 should work with maildirs and everything.
212 TK/08 Apply fix provided by Michael Haardt to prevent deadlock in case of
213 spamd dying while we are connected to it.
215 TF/05 Fixed a ${extract error message typo reported by Jeremy Harris
218 PH/12 Applied Alex Kiernan's patch for the API change for the error callback
219 function for BDB 4.3.
221 PH/13 Changed auto_thaw such that it does not apply to bounce messages.
223 PH/14 Imported PCRE 6.0; this was more than just a trivial operation because
224 the sources for PCRE have been re-arranged and more files are now
227 PH/15 The code I had for printing potentially long long variables in PH/11
228 above was not the best (it lost precision). The length of off_t variables
229 is now inspected at build time, and an appropriate printing format (%ld
230 or %lld) is chosen and #defined by OFF_T_FMT. We also define LONGLONG_T
231 to be "long long int" or "long int". This is needed for the internal
232 formatting function string_vformat().
234 PH/16 Applied Matthew Newton's patch to exicyclog: "If log_file_path is set in
235 the configuration file to be ":syslog", then the script "guesses" where
236 the logs files are, rather than using the compiled in default. In our
237 case the guess is not the same as the compiled default, so the script
238 suddenly stopped working when I started to use syslog. The patch checks
239 to see if log_file_path is "". If so, it attempts to read it from exim
240 with no configuration file to get the compiled in version, before it
241 falls back to the previous guessing code."
243 TK/09 Added "prvs" and "prvscheck" expansion items. These help a lot with
244 implementing BATV in an Exim configuration. See NewStuff for the gory
247 PH/17 Applied Michael Haardt's patch for HP-UX, affecting only the os.h and
248 Makefile that are specific to HP-UX.
250 PH/18 If the "use_postmaster" option was set for a recipient callout together
251 with the "random" option, the postmaster address was used as the MAIL
252 FROM address for the random test, but not for the subsequent recipient
253 test. It is now used for both.
255 PH/19 Applied Michael Haardt's patch to update Sieve to RFC3028bis. "The
256 patch removes a few documentation additions to RFC 3028, because the
257 latest draft now contains them. It adds the new en;ascii-case comparator
258 and a new error check for 8bit text in MIME parts. Comparator and
259 require names are now matched exactly. I enabled the subaddress
260 extension, but it is not well tested yet (read: it works for me)."
262 PH/20 Added macros for time_t as for off_t (see PH/15 above) and used them to
263 rework some of the code of TK/09 above to avoid the hardwired use of
264 "%lld" and "long long". Replaced the call to snprintf() with a call to
267 PH/21 Added some other messages to those in 4.51/PH/42, namely "All relevant MX
268 records point to non-existent hosts", "retry timeout exceeded", and
269 "retry time not reached for any host after a long failure period".
271 PH/22 Fixed some oversights/typos causing bugs when Exim is compiled with
272 experimental DomainKeys support:
274 (1) The filter variables $n0-$n9 and $sn0-$sn9 were broken.
275 (2) On an error such as an illegally used "control", the wrong name for
276 the control was given.
278 These problems did NOT occur unless DomainKeys support was compiled.
280 PH/23 Added daemon_startup_retries and daemon_startup_sleep.
282 PH/24 Added ${if match_ip condition.
284 PH/25 Put debug statements on either side of calls to EXIM_DBOPEN() for hints
285 databases so that it will be absolutely obvious if a crash occurs in the
286 DB library. This is a regular occurrence (often caused by mis-matched
289 PH/26 Insert a lot of missing (void) casts for functions such as chown(),
290 chmod(), fcntl(), sscanf(), and other functions from stdio.h. These were
291 picked up on a user's system that detects such things. There doesn't seem
292 to be a gcc warning option for this - only an attribute that has to be
293 put on the function's prototype. It seems that in Fedora Core 4 they have
294 set this on a number of new functions. No doubt there will be more in due
297 PH/27 If a dnslookup or manualroute router is set with verify=only, it need not
298 specify a transport. However, if an address that was verified by such a
299 router was the subject of a callout, Exim crashed because it tried to
300 read the rcpt_include_affixes from the non-existent transport. Now it
301 just assumes that the setting of that option is false. This bug was
302 introduced by 4.51/PH/31.
304 PH/28 Changed -d+all to exclude +memory, because that information is very
305 rarely of interest, but it makes the output a lot bigger. People tend to
306 do -d+all out of habit.
308 PH/29 Removed support for the Linux-libc5 build, as it is obsolete and the
309 code in os-type was giving problems when libc.so lives in lib64, like on
312 PH/30 Exim's DNS code uses the original T_xxx names for DNS record times. These
313 aren't the modern standard, and it seems that some systems' include files
314 don't always have them. Exim was already checking for some of the newer
315 ones like T_AAAA, and defining it itself. I've added checks for all the
316 record types that Exim uses.
318 PH/31 When using GnuTLS, if the parameters cache file did not exist, Exim was
319 not automatically generating a new one, as it is supposed to. This
320 prevented TLS from working. If the file did exist, but contained invalid
321 data, a new version was generated, as expected. It was only the case of a
322 non-existent file that was broken.
324 TK/10 Domainkeys: Fix a bug in verification that caused a crash in conjunction
325 with a change in libdomainkeys > 0.64.
327 TK/11 Domainkeys: Change the logic how the "testing" policy flag is retrieved
328 from DNS. If the selector record carries the flag, it now has
329 precedence over the domain-wide flag.
331 TK/12 Cleared some compiler warnings related to SPF, SRS and DK code.
333 PH/32 In mua_wrapper mode, if an smtp transport configuration error (such as
334 the use of a port name that isn't defined in /etc/services) occurred, the
335 message was deferred as in a normal delivery, and thus remained on the
336 spool, instead of being failed because of the mua_wrapper setting. This
337 is now fixed, and I tidied up some of the mua_wrapper messages at the
340 SC/08 Eximstats: whilst parsing the mainlog(s), store information about
341 the messages in a hash of arrays rather than using individual hashes.
342 This is a bit cleaner and results in dramatic memory savings, albeit
343 at a slight CPU cost.
345 SC/09 Eximstats: added the -show_rt<list> and the -show_dt<list> flags
346 as requested by Marc Sherman.
348 SC/10 Eximstats: added histograms for user specified patterns as requested
351 SC/11 Eximstats: v1.43 - bugfix for pattern histograms with -h0 specified.
353 PH/33 Patch from the Cygwin maintainer to add "b" to all occurences of
354 fopen() in the content-scanning modules that did not already have it.
360 TK/01 Added Yahoo DomainKeys support via libdomainkeys. See
361 doc/experimental-spec.txt for details. (http://domainkeys.sf.net)
363 TK/02 Fix ACL "control" statement not being available in MIME ACL.
365 TK/03 Fix ACL "regex" condition not being available in MIME ACL.
367 PH/01 Installed a patch from the Sieve maintainer that allows -bf to be used
368 to test Sieve filters that use "vacation".
370 PH/02 Installed a slightly modified version of Nikos Mavrogiannopoulos' patch
371 that changes the way the GnuTLS parameters are stored in the cache file.
372 The new format can be generated externally. For backward compatibility,
373 if the data in the cache doesn't make sense, Exim assumes it has read an
374 old-format file, and it generates new data and writes a new file. This
375 means that you can't go back to an older release without removing the
378 PH/03 A redirect router that has both "unseen" and "one_time" set does not
379 work if there are any delivery delays because "one_time" forces the
380 parent to be marked "delivered", so its unseen clone is never tried
381 again. For this reason, Exim now forbids the simultaneous setting of
384 PH/04 Change 4.11/85 fixed an obscure bug concerned with addresses that are
385 redirected to themselves ("homonym" addresses). Read the long ChangeLog
386 entry if you want to know the details. The fix, however, neglected to
387 consider the case when local delivery batching is involved. The test for
388 "previously delivered" was not happening when checking to see if an
389 address could be batched with a previous (undelivered) one; under
390 certain circumstances this could lead to multiple deliveries to the same
393 PH/05 Renamed the macro SOCKLEN_T as EXIM_SOCKLEN_T because AIX uses SOCKLEN_T
394 in its include files, and this causes problems building Exim.
396 PH/06 A number of "verify =" ACL conditions have no options (e.g. verify =
397 header_syntax) but Exim was just ignoring anything given after a slash.
398 In particular, this caused confusion with an attempt to use "verify =
399 reverse_host_lookup/defer_ok". An error is now given when options are
400 supplied for verify items that do not have them. (Maybe reverse_host_
401 lookup should have a defer_ok option, but that's a different point.)
403 PH/07 Increase the size of the buffer for incoming SMTP commands from 512 (as
404 defined by RFC 821) to 2048, because there were problems with some AUTH
405 commands, and RFC 1869 says the size should be increased for extended
406 SMTP commands that take arguments.
408 PH/08 Added ${dlfunc dynamically loaded function for expansion (code from Tony
411 PH/09 Previously, an attempt to use ${perl when it wasn't compiled gave an
412 "unknown" error; now it says that the functionality isn't in the binary.
414 PH/10 Added a nasty fudge to try to recognize and flatten LDAP passwords in
415 an address' error message when a string expansion fails (syntax or
416 whatever). Otherwise the password may appear in the log. Following change
417 PH/42 below, there is no longer a chance of it appearing in a bounce
420 PH/11 Installed exipick version 20050225.0 from John Jetmore.
422 PH/12 If the last host in a fallback_hosts list was multihomed, only the first
423 of its addresses was ever tried. (Bugzilla bug #2.)
425 PH/13 If "headers_add" in a transport didn't end in a newline, Exim printed
426 the result incorrectly in the debug output. (It correctly added a newline
427 to what was transported.)
429 TF/01 Added $received_time.
431 PH/14 Modified the default configuration to add an acl_smtp_data ACL, with
432 commented out examples of how to interface to a virus scanner and to
433 SpamAssassin. Also added commented examples of av_scanner and
434 spamd_address settings.
436 PH/15 Further to TK/02 and TK/03 above, tidied up the tables of what conditions
437 and controls are allowed in which ACLs. There were a couple of minor
438 errors. Some of the entries in the conditions table (which is a table of
439 where they are NOT allowed) were getting very unwieldy; rewrote them as a
440 negation of where the condition IS allowed.
442 PH/16 Installed updated OS/os.c-cygwin from the Cygwin maintainer.
444 PH/17 The API for radiusclient changed at release 0.4.0. Unfortunately, the
445 header file does not have a version number, so I've had to invent a new
446 value for RADIUS_LIB_TYPE, namely "RADIUSCLIENTNEW" to request the new
447 API. The code is untested by me (my Linux distribution still has 0.3.2 of
448 radiusclient), but it was contributed by a Radius user.
450 PH/18 Installed Lars Mainka's patch for the support of CRL collections in
451 files or directories, for OpenSSL.
453 PH/19 When an Exim process that is running as root has to create an Exim log
454 file, it does so in a subprocess that runs as exim:exim so as to get the
455 ownership right at creation (otherwise, other Exim processes might see
456 the file with the wrong ownership). There was no test for failure of this
457 fork() call, which would lead to the process getting stuck as it waited
458 for a non-existent subprocess. Forks do occasionally fail when resources
459 run out. I reviewed all the other calls to fork(); they all seem to check
462 PH/20 When checking for unexpected SMTP input at connect time (before writing
463 the banner), Exim was not dealing correctly with a non-positive return
464 from the read() function. If the client had disconnected by this time,
465 the result was a log entry for a synchronization error with an empty
466 string after "input=" when read() returned zero. If read() returned -1
467 (an event I could not check), uninitialized data bytes were printed.
468 There were reports of junk text (parts of files, etc) appearing after
471 PH/21 Added acl_not_smtp_mime to allow for MIME scanning for non-SMTP messages.
473 PH/22 Added support for macro redefinition, and (re)definition in between
474 driver and ACL definitions.
476 PH/23 The cyrus_sasl authenticator was expanding server_hostname, but then
477 forgetting to use the resulting value; it was using the unexpanded value.
479 PH/24 The cyrus_sasl authenticator was advertising mechanisms for which it
480 hadn't been configured. The fix is from Juergen Kreileder, who
481 understands it better than I do:
483 "Here's what I see happening with three configured cyrus_sasl
484 authenticators configured (plain, login, cram-md5):
486 On startup auth_cyrus_sasl_init() gets called for each of these.
487 This means three calls to sasl_listmech() without a specified mech_list.
488 => SASL tests which mechs of all available mechs actually work
489 => three warnings about OTP not working
490 => the returned list contains: plain, login, cram-md5, digest-md5, ...
492 With the patch, sasl_listmech() also gets called three times. But now
493 SASL's mech_list option is set to the server_mech specified in the the
494 authenticator. Or in other words, the answer from sasl_listmech()
495 gets limited to just the mech you're testing for (which is different
497 => the return list contains just 'plain' or 'login', 'cram-md5' or
498 nothing depending on the value of ob->server_mech.
500 I've just tested the patch: Authentication still works fine,
501 unavailable mechs specified in the exim configuration are still
502 caught, and the auth.log warnings about OTP are gone."
504 PH/25 When debugging is enabled, the contents of the command line are added
505 to the debugging output, even when log_selector=+arguments is not
508 PH/26 Change scripts/os-type so that when "uname -s" returns just "GNU", the
509 answer is "GNU", and only if the return is "GNU/something" is the answer
512 PH/27 $acl_verify_message is now set immediately after the failure of a
513 verification in an ACL, and so is available in subsequent modifiers. In
514 particular, the message can be preserved by coding like this:
516 warn !verify = sender
517 set acl_m0 = $acl_verify_message
519 Previously, $acl_verify_message was set only while expanding "message"
520 and "log_message" when a very denied access.
522 PH/28 Modified OS/os.c-Linux with
524 -#ifndef OS_LOAD_AVERAGE
525 +#if !defined(OS_LOAD_AVERAGE) && defined(__linux__)
527 to make Exim compile on kfreebsd-gnu. (I'm totally confused about the
528 nomenclature these days.)
530 PH/29 Installed patch from the Sieve maintainer that adds the options
531 sieve_useraddress and sieve_subaddress to the redirect router.
533 PH/30 In these circumstances:
534 . Two addresses routed to the same list of hosts;
535 . First host does not offer TLS;
536 . First host accepts first address;
537 . First host gives temporary error to second address;
538 . Second host offers TLS and a TLS session is established;
539 . Second host accepts second address.
540 Exim incorrectly logged both deliveries with the TLS parameters (cipher
541 and peerdn, if requested) that were in fact used only for the second
544 PH/31 When doing a callout as part of verifying an address, Exim was not paying
545 attention to any local part prefix or suffix that was matched by the
546 router that accepted the address. It now behaves in the same way as it
547 does for delivery: the affixes are removed from the local part unless
548 rcpt_include_affixes is set on the transport.
550 PH/32 Add the sender address, as F=<...>, to the log line when logging a
551 timeout during the DATA phase of an incoming message.
553 PH/33 Sieve envelope tests were broken for match types other than :is. I have
554 applied a patch sanctioned by the Sieve maintainer.
556 PH/34 Change 4.50/80 broke Exim in that it could no longer handle cases where
557 the uid or gid is negative. A case of a negative gid caused this to be
558 noticed. The fix allows for either to be negative.
560 PH/35 ACL_WHERE_MIME is now declared unconditionally, to avoid too much code
561 clutter, but the tables that are indexed by ACL_WHERE_xxx values had been
564 PH/36 The change PH/12 above was broken. Fixed it.
566 PH/37 Exim used to check for duplicate addresses in the middle of routing, on
567 the grounds that routing the same address twice would always produce the
568 same answer. This might have been true once, but it is certainly no
569 longer true now. Routing a child address may depend on the previous
570 routing that produced that child. Some complicated redirection strategies
571 went wrong when messages had multiple recipients, and made Exim's
572 behaviour dependent on the order in which the addresses were given.
574 I have moved the duplicate checking until after the routing is complete.
575 Exim scans the addresses that are assigned to local and remote
576 transports, and removes any duplicates. This means that more work will be
577 done, as duplicates will always all be routed, but duplicates are
578 presumably rare, so I don't expect this is of any significance.
580 For deliveries to pipes, files, and autoreplies, the duplicate checking
581 still happens during the routing process, since they are not going to be
584 PH/38 Installed a patch from Ian Freislich, with the agreement of Tom Kistner.
585 It corrects a timeout issue with spamd. This is Ian's comment: "The
586 background is that sometimes spamd either never reads data from a
587 connection it has accepted, or it never writes response data. The exiscan
588 spam.[ch] uses a 3600 second timeout on spamd socket reads, further, it
589 blindly assumes that writes won't block so it may never time out."
591 PH/39 Allow G after quota size as well as K and M.
593 PH/40 The value set for $authenticated_id in an authenticator may not contain
594 binary zeroes or newlines because the value is written to log lines and
595 to spool files. There was no check on this. Now the value is run through
596 the string_printing() function so that such characters are converted to
597 printable escape sequences.
599 PH/41 $message_linecount is a new variable that contains the total number of
600 lines in the message. Compare $body_linecount, which is the count for the
603 PH/42 Exim no longer gives details of delivery errors for specific addresses in
604 bounce and delay warning messages, except in certain special cases, which
607 (a) An SMTP error message from a remote host;
608 (b) A message specified in a :fail: redirection;
609 (c) A message specified in a "fail" command in a system filter;
610 (d) A message specified in a FAIL return from the queryprogram router;
611 (e) A message specified by the cannot_route_message router option.
613 In these cases only, Exim does include the error details in bounce and
614 warning messages. There are also a few cases where bland messages such
615 as "unrouteable address" or "local delivery error" are given.
617 PH/43 $value is now also set for the "else" part of a ${run expansion.
619 PH/44 Applied patch from the Sieve maintainer: "The vacation draft is still
620 being worked on, but at least Exim now implements the latest version to
623 PH/45 In a pipe transport, although a timeout while waiting for the pipe
624 process to complete was treated as a delivery failure, a timeout while
625 writing the message to the pipe was logged, but erroneously treated as a
626 successful delivery. Such timeouts include transport filter timeouts. For
627 consistency with the overall process timeout, these timeouts are now
628 treated as errors, giving rise to delivery failures by default. However,
629 there is now a new Boolean option for the pipe transport called
630 timeout_defer, which, if set TRUE, converts the failures into defers for
631 both kinds of timeout. A transport filter timeout is now identified in
634 PH/46 The "scripts/Configure-config.h" script calls "make" at one point. On
635 systems where "make" and "gmake" are different, calling "gmake" at top
636 level broke things. I've arranged for the value of $(MAKE) to be passed
637 from the Makefile to this script so that it can call the same version of
641 A note about Exim versions 4.44 and 4.50
642 ----------------------------------------
644 Exim 4.50 was meant to be the next release after 4.43. It contains a lot of
645 changes of various kinds. As a consequence, a big documentation update was
646 needed. This delayed the release for rather longer than seemed good, especially
647 in the light of a couple of (minor) security issues. Therefore, the changes
648 that fixed bugs were backported into 4.43, to create a 4.44 maintenance
649 release. So 4.44 and 4.50 are in effect two different branches that both start
652 I have left the 4.50 change log unchanged; it contains all the changes since
653 4.43. The change log for 4.44 is below; many of its items are identical to
654 those for 4.50. This seems to be the most sensible way to preserve the
655 historical information.
661 1. Minor wording change to the doc/README.SIEVE file.
663 2. Change 4.43/35 introduced a bug: if quota_filecount was set, the
664 computation of the current number of files was incorrect.
666 3. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
667 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
670 4. Give more explanation in the error message when the command for a transport
671 filter fails to execute.
673 5. There are several places where Exim runs a non-Exim command in a
674 subprocess. The SIGUSR1 signal should be disabled for these processes. This
675 was being done only for the command run by the queryprogram router. It is
676 now done for all such subprocesses. The other cases are: ${run, transport
677 filters, and the commands run by the lmtp and pipe transports.
679 6. Added CONFIGURE_GROUP build-time option.
681 7. Some older OS have a limit of 256 on the maximum number of file
682 descriptors. Exim was using setrlimit() to set 1000 as a large value
683 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
684 systems. I've change it so that if it can't get 1000, it tries for 256.
686 8. "control=submission" was allowed, but had no effect, in a DATA ACL. This
687 was an oversight, and furthermore, ever since the addition of extra
688 controls (e.g. 4.43/32), the checks on when to allow different forms of
689 "control" were broken. There should now be diagnostics for all cases when a
690 control that does not make sense is encountered.
692 9. Added the /retain_sender option to "control=submission".
694 10. $recipients is now available in the predata ACL (oversight).
696 11. Tidy the search cache before the fork to do a delivery from a message
697 received from the command line. Otherwise the child will trigger a lookup
698 failure and thereby defer the delivery if it tries to use (for example) a
699 cached ldap connection that the parent has called unbind on.
701 12. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
702 of $address_data from the recipient verification was clobbered by the
705 13. The value of address_data from a sender verification is now available in
706 $sender_address_data in subsequent conditions in the ACL statement.
708 14. Added forbid_sieve_filter and forbid_exim_filter to the redirect router.
710 15. Added a new option "connect=<time>" to callout options, to set a different
713 16. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
714 was its contents. (It was OK if the option was not defined at all.)
716 17. A "Completed" log line is now written for messages that are removed from
717 the spool by the -Mrm option.
719 18. New variables $sender_verify_failure and $recipient_verify_failure contain
720 information about exactly what failed.
722 19. Added -dd to debug only the daemon process.
724 20. Incorporated Michael Haardt's patch to ldap.c for improving the way it
725 handles timeouts, both on the server side and network timeouts. Renamed the
726 CONNECT parameter as NETTIMEOUT (but kept the old name for compatibility).
728 21. The rare case of EHLO->STARTTLS->HELO was setting the protocol to "smtp".
729 It is now set to "smtps".
731 22. $host_address is now set to the target address during the checking of
734 23. When checking ignore_target_hosts for an ipliteral router, no host name was
735 being passed; this would have caused $sender_host_name to have been used if
736 matching the list had actually called for a host name (not very likely,
737 since this list is usually IP addresses). A host name is now passed as
740 24. Changed the calls that set up the SIGCHLD handler in the daemon to use the
741 code that specifies a non-restarting handler (typically sigaction() in
742 modern systems) in an attempt to fix a rare and obscure crash bug.
744 25. Narrowed the window for a race in the daemon that could cause it to ignore
745 SIGCHLD signals. This is not a major problem, because they are used only to
746 wake it up if nothing else does.
748 26. A malformed maildirsize file could cause Exim to calculate negative values
749 for the mailbox size or file count. Odd effects could occur as a result.
750 The maildirsize information is now recalculated if the size or filecount
753 27. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
754 support for a long time. Removed HAVE_SYS_VFS_H.
756 28. Installed the latest version of exipick from John Jetmore.
758 29. In an address list, if the pattern was not a regular expression, an empty
759 subject address (from a bounce message) matched only if the pattern was an
760 empty string. Non-empty patterns were not even tested. This was the wrong
761 because it is perfectly reasonable to use an empty address as part of a
762 database query. An empty address is now tested by patterns that are
763 lookups. However, all the other forms of pattern expect the subject to
764 contain a local part and a domain, and therefore, for them, an empty
765 address still always fails if the pattern is not itself empty.
767 30. Exim went into a mad DNS loop when attempting to do a callout where the
768 host was specified on an smtp transport, and looking it up yielded more
771 31. Re-factored the code for checking spool and log partition space into a
772 function that finds that data and another that does the check. The former
773 is then used to implement four new variables: $spool_space, $log_space,
774 $spool_inodes, and $log_inodes.
776 32. The RFC2047 encoding function was originally intended for short strings
777 such as real names; it was not keeping to the 75-character limit for
778 encoded words that the RFC imposes. It now respects the limit, and
779 generates multiple encoded words if necessary. To be on the safe side, I
780 have increased the buffer size for the ${rfc2047: expansion operator from
783 33. It is now permitted to omit both strings after an "if" condition; if the
784 condition is true, the result is "true". As before, when the second string
785 is omitted, a false condition yields an empty string. This makes it less
786 cumbersome to write custom ACL and router conditions.
788 34. Failure to deliver a bounce message always caused it to be frozen, even if
789 there was an errors_to setting on the router. The errors_to setting is now
792 35. If an IPv6 address is given for -bh or -bhc, it is now converted to the
793 canonical form (fully expanded) before being placed in
794 $sender_host_address.
796 36. The table in the code that translates DNS record types into text (T_A to
797 "A" for instance) was missing entries for NS and CNAME. It is just possible
798 that this could have caused confusion if both these types were looked up
799 for the same domain, because the text type is used as part of Exim's
800 per-process caching. But the chance of anyone hitting this buglet seems
803 37. The dnsdb lookup has been extended in a number of ways.
805 (1) There is a new type, "zns", which walks up the domain tree until it
806 finds some nameserver records. It should be used with care.
808 (2) There is a new type, "mxh", which is like "mx" except that it returns
809 just the host names, not the priorities.
811 (3) It is now possible to give a list of domains (or IP addresses) to be
812 looked up. The behaviour when one of the lookups defers can be
813 controlled by a keyword.
815 (4) It is now possible to specify the separator character for use when
816 multiple records are returned.
818 38. The dnslists ACL condition has been extended: it is now possible to supply
819 a list of IP addresses and/or domains to be looked up in a particular DNS
822 39. Added log_selector=+queue_time_overall.
824 40. When running the queue in the test harness, wait just a tad after forking a
825 delivery process, to get repeatability of debugging output.
827 41. Include certificate and key file names in error message when GnuTLS fails
828 to set them up, because the GnuTLS error message doesn't include the name
829 of the failing file when there is a problem reading it.
831 42. Allow both -bf and -bF in the same test run.
833 43. Did the same fix as 41 above for OpenSSL, which had the same infelicity.
835 44. The "Exiscan patch" is now merged into the mainline Exim source.
837 45. Sometimes the final signoff response after QUIT could fail to get
838 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
839 < 0 before doing a fflush(). This bug looks as though it goes back to the
840 introduction of TLS in release 3.20, but "sometimes" must have been rare
841 because the tests only now provoked it.
843 46. Reset the locale to "C" after calling embedded Perl, in case it was changed
844 (this can affect the format of dates).
846 47. exim_tidydb, when checking for the continued existence of a message for
847 which it has found a message-specific retry record, was not finding
848 messages that were in split spool directories. Consequently, it was
849 deleting retry records that should have stayed in existence.
851 48. Steve fixed some bugs in eximstats.
853 49. The SPA authentication driver was not abandoning authentication and moving
854 on to the next authenticator when an expansion was forced to fail,
855 contradicting the general specification for all authenticators. Instead it
856 was generating a temporary error. It now behaves as specified.
858 50. The default ordering of permitted cipher suites for GnuTLS was pessimal
859 (the order specifies the preference for clients). The order is now AES256,
860 AES128, 3DES, ARCFOUR128.
862 51. Small patch to Sieve code - explicitly set From: when generating an
865 52. Exim crashed if a remote delivery caused a very long error message to be
866 recorded - for instance if somebody sent an entire SpamAssassin report back
867 as a large number of 550 error lines. This bug was coincidentally fixed by
868 increasing the size of one of Exim's internal buffers (big_buffer) that
869 happened as part of the Exiscan merge. However, to be on the safe side, I
870 have made the code more robust (and fixed the comments that describe what
873 53. Now that there can be additional text after "Completed" in log lines (if
874 the queue_time_overall log selector is set), a one-byte patch to exigrep
875 was needed to allow it to recognize "Completed" as not the last thing in
878 54. The LDAP lookup was not handling a return of LDAP_RES_SEARCH_REFERENCE. A
879 patch that reportedly fixes this has been added. I am not expert enough to
880 create a test for it. This is what the patch creator wrote:
882 "I found a little strange behaviour of ldap code when working with
883 Windows 2003 AD Domain, where users was placed in more than one
884 Organization Units. When I tried to give exim partial DN, the exit code
885 of ldap_search was unknown to exim because of LDAP_RES_SEARCH_REFERENCE.
886 But simultaneously result of request was absolutely normal ldap result,
887 so I produce this patch..."
889 Later: it seems that not all versions of LDAP support LDAP_RES_SEARCH_
890 REFERENCE, so I have modified the code to exclude the patch when that macro
893 55. Some experimental protocols are using DNS PTR records for new purposes. The
894 keys for these records are domain names, not reversed IP addresses. The
895 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
896 leaves it alone. Component reversal etc. now happens only for IP addresses.
899 56. Improve error message when ldap_search() fails in OpenLDAP or Solaris LDAP.
901 57. Double the size of the debug message buffer (to 2048) so that more of very
902 long debug lines gets shown.
904 58. The exicyclog utility now does better if the number of log files to keep
905 exceeds 99. In this case, it numbers them 001, 002 ... instead of 01, 02...
907 59. Two changes related to the smtp_active_hostname option:
909 (1) $smtp_active_hostname is now available as a variable.
910 (2) The default for smtp_banner uses $smtp_active_hostname instead
911 of $primary_hostname.
913 60. The host_aton() function is supposed to be passed a string that is known
914 to be a valid IP address. However, in the case of IPv6 addresses, it was
915 not checking this. This is a hostage to fortune. Exim now panics and dies
916 if the condition is not met. A case was found where this could be provoked
917 from a dnsdb PTR lookup with an IPv6 address that had more than 8
918 components; fortuitously, this particular loophole had already been fixed
919 by change 4.50/55 above.
921 If there are any other similar loopholes, the new check in host_aton()
922 itself should stop them being exploited. The report I received stated that
923 data on the command line could provoke the exploit when Exim was running as
924 exim, but did not say which command line option was involved. All I could
925 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
929 61. There was a buffer overflow vulnerability in the SPA authentication code
930 (which came originally from the Samba project). I have added a test to the
931 spa_base64_to_bits() function which I hope fixes it.
934 62. Configuration update for GNU/Hurd and variations. Updated Makefile-GNU and
935 os.h-GNU, and added configuration files for GNUkFreeBSD and GNUkNetBSD.
937 63. The daemon start-up calls getloadavg() while still root for those OS that
938 need the first call to be done as root, but it missed one case: when
939 deliver_queue_load_max is set with deliver_drop_privilege. This is
940 necessary for the benefit of the queue runner, because there is no re-exec
941 when deliver_drop_privilege is set.
943 64. A call to exiwhat cut short delays set up by "delay" modifiers in ACLs.
946 65. Caching of lookup data for "hosts =" ACL conditions, when a named host list
947 was in use, was not putting the data itself into the right store pool;
948 consequently, it could be overwritten for a subsequent message in the same
949 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
952 66. Added hosts_max_try_hardlimit to the smtp transport, default 50.
954 67. The string_is_ip_address() function returns 0, 4, or 6, for "no an IP
955 address", "IPv4 address", and "IPv6 address", respectively. Some calls of
956 the function were treating the return as a boolean value, which happened to
957 work because 0=false and not-0=true, but is not correct code.
959 68. The host_aton() function was not handling scoped IPv6 addresses (those
960 with, for example, "%eth0" on the end) correctly.
962 69. Fixed some compiler warnings in acl.c for the bitmaps specified with
963 negated items (that is, ~something) in unsigned ints. Some compilers
964 apparently mutter when there is no cast.
966 70. If an address verification called from an ACL failed, and did not produce a
967 user-specific message (i.e. there was only a "system" message), nothing was
968 put in $acl_verify_message. In this situation, it now puts the system
971 71. Change 4.23/11 added synchronization checking at the start of an SMTP
972 session; change 4.31/43 added the unwanted input to the log line - except
973 that it did not do this in the start of session case. It now does.
975 72. After a timeout in a callout SMTP session, Exim still sent a QUIT command.
976 This is wrong and can cause the other end to generate a synchronization
977 error if it is another Exim or anything else that does the synchronization
978 check. A QUIT command is no longer sent after a timeout.
980 73. $host_lookup_deferred has been added, to make it easier to detect DEFERs
983 74. The defer_ok option of callout verification was not working if it was used
984 when verifying addresses in header lines, that is, for this case:
986 verify = header_sender/callout=defer_ok
988 75. A backgrounded daemon closed stdin/stdout/stderr on entry; this meant that
989 those file descriptors could be used for SMTP connections. If anything
990 wrote to stderr (the example that came up was "warn" in embedded Perl), it
991 could be sent to the SMTP client, causing chaos. The daemon now opens
992 stdin, stdout, and stderr to /dev/null when it puts itself into the
995 76. Arrange for output from Perl's "warn" command to be written to Exim's main
996 log by default. The user can override this with suitable Perl magic.
998 77. The use of log_message on a "discard" ACL verb, which is supposed to add to
999 the log message when discard triggers, was not working for the DATA ACL or
1000 for the non-SMTP ACL.
1002 78. Error message wording change in sieve.c.
1004 79. If smtp_accept_max_per_host was set, the number of connections could be
1005 restricted to fewer than expected, because the daemon was trying to set up
1006 a new connection before checking whether the processes handling previous
1007 connections had finished. The check for completed processes is now done
1008 earlier. On busy systems, this bug wouldn't be noticed because something
1009 else would have woken the daemon, and it would have reaped the completed
1012 80. If a message was submitted locally by a user whose login name contained one
1013 or more spaces (ugh!), the spool file that Exim wrote was not re-readable.
1014 It caused a spool format error. I have fixed the spool reading code. A
1015 related problem was that the "from" clause in the Received: line became
1016 illegal because of the space(s). It is now covered by ${quote_local_part.
1018 81. Included the latest eximstats from Steve (adds average sizes to HTML Top
1021 82. Updated OS/Makefile-AIX as per message from Mike Meredith.
1023 83. Patch from Sieve maintainer to fix unterminated string problem in
1024 "vacation" handling.
1026 84. Some minor changes to the Linux configuration files to help with other
1027 OS variants using glibc.
1029 85. One more patch for Sieve to update vacation handling to latest spec.
1032 ----------------------------------------------------
1033 See the note above about the 4.44 and 4.50 releases.
1034 ----------------------------------------------------
1040 1. Change 4.43/35 introduced a bug that caused file counts to be
1041 incorrectly computed when quota_filecount was set in an appendfile
1044 2. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
1045 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
1048 3. Give more explanation in the error message when the command for a transport
1049 filter fails to execute.
1051 4. There are several places where Exim runs a non-Exim command in a
1052 subprocess. The SIGUSR1 signal should be disabled for these processes. This
1053 was being done only for the command run by the queryprogram router. It is
1054 now done for all such subprocesses. The other cases are: ${run, transport
1055 filters, and the commands run by the lmtp and pipe transports.
1057 5. Some older OS have a limit of 256 on the maximum number of file
1058 descriptors. Exim was using setrlimit() to set 1000 as a large value
1059 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
1060 systems. I've change it so that if it can't get 1000, it tries for 256.
1062 6. "control=submission" was allowed, but had no effect, in a DATA ACL. This
1063 was an oversight, and furthermore, ever since the addition of extra
1064 controls (e.g. 4.43/32), the checks on when to allow different forms of
1065 "control" were broken. There should now be diagnostics for all cases when a
1066 control that does not make sense is encountered.
1068 7. $recipients is now available in the predata ACL (oversight).
1070 8. Tidy the search cache before the fork to do a delivery from a message
1071 received from the command line. Otherwise the child will trigger a lookup
1072 failure and thereby defer the delivery if it tries to use (for example) a
1073 cached ldap connection that the parent has called unbind on.
1075 9. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
1076 of $address_data from the recipient verification was clobbered by the
1077 sender verification.
1079 10. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
1080 was its contents. (It was OK if the option was not defined at all.)
1082 11. A "Completed" log line is now written for messages that are removed from
1083 the spool by the -Mrm option.
1085 12. $host_address is now set to the target address during the checking of
1086 ignore_target_hosts.
1088 13. When checking ignore_target_hosts for an ipliteral router, no host name was
1089 being passed; this would have caused $sender_host_name to have been used if
1090 matching the list had actually called for a host name (not very likely,
1091 since this list is usually IP addresses). A host name is now passed as
1094 14. Changed the calls that set up the SIGCHLD handler in the daemon to use the
1095 code that specifies a non-restarting handler (typically sigaction() in
1096 modern systems) in an attempt to fix a rare and obscure crash bug.
1098 15. Narrowed the window for a race in the daemon that could cause it to ignore
1099 SIGCHLD signals. This is not a major problem, because they are used only to
1100 wake it up if nothing else does.
1102 16. A malformed maildirsize file could cause Exim to calculate negative values
1103 for the mailbox size or file count. Odd effects could occur as a result.
1104 The maildirsize information is now recalculated if the size or filecount
1107 17. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
1108 support for a long time. Removed HAVE_SYS_VFS_H.
1110 18. Updated exipick to current release from John Jetmore.
1112 19. Allow an empty sender to be matched against a lookup in an address list.
1113 Previously the only cases considered were a regular expression, or an
1116 20. Exim went into a mad DNS lookup loop when doing a callout where the
1117 host was specified on the transport, if the DNS lookup yielded more than
1120 21. The RFC2047 encoding function was originally intended for short strings
1121 such as real names; it was not keeping to the 75-character limit for
1122 encoded words that the RFC imposes. It now respects the limit, and
1123 generates multiple encoded words if necessary. To be on the safe side, I
1124 have increased the buffer size for the ${rfc2047: expansion operator from
1127 22. Failure to deliver a bounce message always caused it to be frozen, even if
1128 there was an errors_to setting on the router. The errors_to setting is now
1131 23. If an IPv6 address is given for -bh or -bhc, it is now converted to the
1132 canonical form (fully expanded) before being placed in
1133 $sender_host_address.
1135 24. Updated eximstats to version 1.33
1137 25. Include certificate and key file names in error message when GnuTLS fails
1138 to set them up, because the GnuTLS error message doesn't include the name
1139 of the failing file when there is a problem reading it.
1141 26. Expand error message when OpenSSL has problems setting up cert/key files.
1144 27. Reset the locale to "C" after calling embedded Perl, in case it was changed
1145 (this can affect the format of dates).
1147 28. exim_tidydb, when checking for the continued existence of a message for
1148 which it has found a message-specific retry record, was not finding
1149 messages that were in split spool directories. Consequently, it was
1150 deleting retry records that should have stayed in existence.
1152 29. eximstats updated to version 1.35
1153 1.34 - allow eximstats to parse syslog lines as well as mainlog lines
1154 1.35 - bugfix such that pie charts by volume are generated correctly
1156 30. The SPA authentication driver was not abandoning authentication and moving
1157 on to the next authenticator when an expansion was forced to fail,
1158 contradicting the general specification for all authenticators. Instead it
1159 was generating a temporary error. It now behaves as specified.
1161 31. The default ordering of permitted cipher suites for GnuTLS was pessimal
1162 (the order specifies the preference for clients). The order is now AES256,
1163 AES128, 3DES, ARCFOUR128.
1165 31. Small patch to Sieve code - explicitly set From: when generating an
1168 32. Exim crashed if a remote delivery caused a very long error message to be
1169 recorded - for instance if somebody sent an entire SpamAssassin report back
1170 as a large number of 550 error lines. This bug was coincidentally fixed by
1171 increasing the size of one of Exim's internal buffers (big_buffer) that
1172 happened as part of the Exiscan merge. However, to be on the safe side, I
1173 have made the code more robust (and fixed the comments that describe what
1176 33. Some experimental protocols are using DNS PTR records for new purposes. The
1177 keys for these records are domain names, not reversed IP addresses. The
1178 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
1179 leaves it alone. Component reversal etc. now happens only for IP addresses.
1182 34. The host_aton() function is supposed to be passed a string that is known
1183 to be a valid IP address. However, in the case of IPv6 addresses, it was
1184 not checking this. This is a hostage to fortune. Exim now panics and dies
1185 if the condition is not met. A case was found where this could be provoked
1186 from a dnsdb PTR lookup with an IPv6 address that had more than 8
1187 components; fortuitously, this particular loophole had already been fixed
1188 by change 4.50/55 or 4.44/33 above.
1190 If there are any other similar loopholes, the new check in host_aton()
1191 itself should stop them being exploited. The report I received stated that
1192 data on the command line could provoke the exploit when Exim was running as
1193 exim, but did not say which command line option was involved. All I could
1194 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
1195 running as the user.
1198 35. There was a buffer overflow vulnerability in the SPA authentication code
1199 (which came originally from the Samba project). I have added a test to the
1200 spa_base64_to_bits() function which I hope fixes it.
1203 36. The daemon start-up calls getloadavg() while still root for those OS that
1204 need the first call to be done as root, but it missed one case: when
1205 deliver_queue_load_max is set with deliver_drop_privilege. This is
1206 necessary for the benefit of the queue runner, because there is no re-exec
1207 when deliver_drop_privilege is set.
1209 37. Caching of lookup data for "hosts =" ACL conditions, when a named host list
1210 was in use, was not putting the data itself into the right store pool;
1211 consequently, it could be overwritten for a subsequent message in the same
1212 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
1215 38. Sometimes the final signoff response after QUIT could fail to get
1216 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
1217 < 0 before doing a fflush(). This bug looks as though it goes back to the
1218 introduction of TLS in release 3.20, but "sometimes" must have been rare
1219 because the tests only now provoked it.
1225 1. Fixed a longstanding but relatively impotent bug: a long time ago, before
1226 PIPELINING, the function smtp_write_command() used to return TRUE or FALSE.
1227 Now it returns an integer. A number of calls were still expecting a T/F
1228 return. Fortuitously, in all cases, the tests worked in OK situations,
1229 which is the norm. However, things would have gone wrong on any write
1230 failures on the smtp file descriptor. This function is used when sending
1231 messages over SMTP and also when doing verify callouts.
1233 2. When Exim is called to do synchronous delivery of a locally submitted
1234 message (the -odf or -odi options), it no longer closes stderr before doing
1237 3. Implemented the mua_wrapper option.
1239 4. Implemented mx_fail_domains and srv_fail_domains for the dnslookup router.
1241 5. Implemented the functions header_remove(), header_testname(),
1242 header_add_at_position(), and receive_remove_recipient(), and exported them
1245 6. If an ACL "warn" statement specified the addition of headers, Exim already
1246 inserted X-ACL-Warn: at the start if there was no header name. However, it
1247 was not making this test for the second and subsequent header lines if
1248 there were newlines in the string. This meant that an invalid header could
1249 be inserted if Exim was badly configured.
1251 7. Allow an ACL "warn" statement to add header lines at the start or after all
1252 the Received: headers, as well as at the end.
1254 8. Added the rcpt_4xx retry error code.
1256 9. Added postmaster_mailfrom=xxx to callout verification option.
1258 10. Added mailfrom=xxxx to the callout verification option, for verify=
1261 11. ${substr_1_:xxxx} and ${substr__3:xxxx} are now diagnosed as syntax errors
1262 (they previously behaved as ${substr_1_0:xxxx} and ${substr:_0_3:xxxx}).
1264 12. Inserted some casts to stop certain compilers warning when using pointer
1265 differences as field lengths or precisions in printf-type calls (mostly
1266 affecting debugging statements).
1268 13. Added optional readline() support for -be (dynamically loaded).
1270 14. Obscure bug fix: if a message error (e.g. 4xx to MAIL) happened within the
1271 same clock tick as a message's arrival, so that its received time was the
1272 same as the "first fail" time on the retry record, and that message
1273 remained on the queue past the ultimate address timeout, every queue runner
1274 would try a delivery (because it was past the ultimate address timeout) but
1275 after another failure, the ultimate address timeout, which should have then
1276 bounced the address, did not kick in. This was a "< instead of <=" error;
1277 in most cases the first failure would have been in the next clock tick
1278 after the received time, and all would be well.
1280 15. The special items beginning with @ in domain lists (e.g. @mx_any) were not
1281 being recognized when the domain list was tested by the match_domain
1282 condition in an expansion string.
1284 16. Added the ${str2b64: operator.
1286 17. Exim was always calling setrlimit() to set a large limit for the number of
1287 processes, without checking whether the existing limit was already
1288 adequate. (It did check for the limit on file descriptors.) Furthermore,
1289 errors from getrlimit() and setrlimit() were being ignored. Now they are
1290 logged to the main and panic logs, but Exim does carry on, to try to do its
1291 job under whatever limits there are.
1293 18. Imported PCRE 5.0.
1295 19. Trivial typo in log message " temporarily refused connection" (the leading
1298 20. If the log selector return_path_on_delivery was set and an address was
1299 redirected to /dev/null, the delivery process crashed because it assumed
1300 that a return path would always be set for a "successful" delivery. In this
1301 case, the whole delivery is bypassed as an optimization, and therefore no
1304 21. Internal re-arrangement: the function for sending a challenge and reading
1305 a response while authentication was assuming a zero-terminated challenge
1306 string. It's now changed to take a pointer and a length, to allow for
1307 binary data in such strings.
1309 22. Added the cyrus_sasl authenticator (code supplied by MBM).
1311 23. Exim was not respecting finduser_retries when seeking the login of the
1312 uid under which it was called; it was always trying 10 times. (The default
1313 setting of finduser_retries is zero.) Also, it was sleeping after the final
1314 failure, which is pointless.
1316 24. Implemented tls_on_connect_ports.
1318 25. Implemented acl_smtp_predata.
1320 26. If the domain in control=submission is set empty, Exim assumes that the
1321 authenticated id is a complete email address when it generates From: or
1322 Sender: header lines.
1324 27. Added "#define SOCKLEN_T int" to OS/os.h-SCO and OS/os.h-SCO_SV. Also added
1325 definitions to OS/Makefile-SCO and OS/Makefile-SCO_SV that put basename,
1326 chown and chgrp in /bin and hostname in /usr/bin.
1328 28. Exim was keeping the "process log" file open after each use, just as it
1329 does for the main log. This opens the possibility of it remaining open for
1330 long periods when the USR1 signal hits a daemon. Occasional processlog
1331 errors were reported, that could have been caused by this. Anyway, it seems
1332 much more sensible not to leave this file open at all, so that is what now
1335 29. The long-running daemon process does not normally write to the log once it
1336 has entered its main loop, and it closes the log before doing so. This is
1337 so that log files can straightforwardly be renamed and moved. However,
1338 there are a couple of unusual error situations where the daemon does write
1339 log entries, and I had neglected to close the log afterwards.
1341 30. The text of an SMTP error response that was received during a remote
1342 delivery was being truncated at 512 bytes. This is too short for some of
1343 the long messages that one sometimes sees. I've increased the limit to
1346 31. It is now possible to make retry rules that apply only when a message has a
1347 specific sender, in particular, an empty sender.
1349 32. Added "control = enforce_sync" and "control = no_enforce_sync". This makes
1350 it possible to be selective about when SMTP synchronization is enforced.
1352 33. Added "control = caseful_local_part" and "control = "caselower_local_part".
1354 32. Implemented hosts_connection_nolog.
1356 33. Added an ACL for QUIT.
1358 34. Setting "delay_warning=" to disable warnings was not working; it gave a
1361 35. Added mailbox_size and mailbox_filecount to appendfile.
1363 36. Added control = no_multiline_responses to ACLs.
1365 37. There was a bug in the logic of the code that waits for the clock to tick
1366 in the case where the clock went backwards by a substantial amount such
1367 that the microsecond fraction of "now" was more than the microsecond
1368 fraction of "then" (but the whole seconds number was less).
1370 38. Added support for the libradius Radius client library this is found on
1371 FreeBSD (previously only the radiusclient library was supported).
1377 1. When certain lookups returned multiple values in the form name=value, the
1378 quoting of the values was not always being done properly. Specifically:
1379 (a) If the value started with a double quote, but contained no whitespace,
1381 (b) If the value contained whitespace other than a space character (i.e.
1382 tabs or newlines or carriage returns) it was not quoted.
1383 This fix has been applied to the mysql and pgsql lookups by writing a
1384 separate quoting function and calling it from the lookup code. The fix
1385 should probably also be applied to nisplus, ibase and oracle lookups, but
1386 since I cannot test any of those, I have not disturbed their existing code.
1388 2. A hit in the callout cache for a specific address caused a log line with no
1389 reason for rejecting RCPT. Now it says "Previous (cached) callout
1390 verification failure".
1392 3. There was an off-by-one bug in the queryprogram router. An over-long
1393 return line was truncated at 256 instead of 255 characters, thereby
1394 overflowing its buffer with the terminating zero. As well as fixing this, I
1395 have increased the buffer size to 1024 (and made a note to document this).
1397 4. If an interrupt, such as the USR1 signal that is send by exiwhat, arrives
1398 when Exim is waiting for an SMTP response from a remote server, Exim
1399 restarts its select() call on the socket, thereby resetting its timeout.
1400 This is not a problem when such interrupts are rare. Somebody set up a cron
1401 job to run exiwhat every 2 minutes, which is less than the normal select()
1402 timeout (5 or 10 minutes). This meant that the select() timeout never
1403 kicked in because it was always reset. I have fixed this by comparing the
1404 time when an interrupt arrives with the time at the start of the first call
1405 to select(). If more time than the timeout has elapsed, the interrupt is
1406 treated as a timeout.
1408 5. Some internal re-factoring in preparation for the addition of Sieve
1409 extensions (by MH). In particular, the "personal" test is moved to a
1410 separate function, and given an option for scanning Cc: and Bcc: (which is
1411 not set for Exim filters).
1413 6. When Exim created an email address using the login of the caller as the
1414 local part (e.g. when creating a From: or Sender: header line), it was not
1415 quoting the local part when it contained special characters such as @.
1417 7. Installed new OpenBSD configuration files.
1419 8. Reworded some messages for syntax errors in "and" and "or" conditions to
1420 try to make them clearer.
1422 9. Callout options, other than the timeout value, were being ignored when
1423 verifying sender addresses in header lines. For example, when using
1425 verify = header_sender/callout=no_cache
1427 the cache was (incorrectly) being used.
1429 10. Added a missing instance of ${EXE} to the exim_install script; this affects
1430 only the Cygwin environment.
1432 11. When return_path_on_delivery was set as a log selector, if different remote
1433 addresses in the same message used different return paths and parallel
1434 remote delivery occurred, the wrong values would sometimes be logged.
1435 (Whenever a remote delivery process finished, the return path value from
1436 the most recently started remote delivery process was logged.)
1438 12. RFC 3848 specifies standard names for the "with" phrase in Received: header
1439 lines when AUTH and/or TLS are in use. This is the "received protocol"
1440 field. Exim used to use "asmtp" for authenticated SMTP, without any
1441 indication (in the protocol name) for TLS use. Now it follows the RFC and
1442 uses "esmtpa" if the connection is authenticated, "esmtps" if it is
1443 encrypted, and "esmtpsa" if it is both encrypted and authenticated. These
1444 names appear in log lines as well as in Received: header lines.
1446 13. Installed MH's patches for Sieve to add the "copy" and "vacation"
1447 extensions, and comparison tests, and to fix some bugs.
1449 14. Changes to the "personal" filter test:
1451 (1) The test was buggy in that it was just doing the equivalent of
1452 "contains" tests on header lines. For example, if a user's address was
1453 anne@some.where, the "personal" test would incorrectly be true for
1455 To: susanne@some.where
1457 This test is now done by extracting each address from the header in turn,
1458 and checking the entire address. Other tests that are part of "personal"
1459 are now done using regular expressions (for example, to check local parts
1460 of addresses in From: header lines).
1462 (2) The list of non-personal local parts in From: addresses has been
1463 extended to include "listserv", "majordomo", "*-request", and "owner-*",
1464 taken from the Sieve specification recommendations.
1466 (3) If the message contains any header line starting with "List-" it is
1467 treated as non-personal.
1469 (4) The test for "circular" in the Subject: header line has been removed
1470 because it now seems ill-conceived.
1472 15. Minor typos in src/EDITME comments corrected.
1474 16. Installed latest exipick from John Jetmore.
1476 17. If headers_add on a router specified a text string that was too long for
1477 string_sprintf() - that is, longer than 8192 bytes - Exim panicked. The use
1478 of string_sprintf() is now avoided.
1480 18. $message_body_size was not set (it was always zero) when running the DATA
1481 ACL and the local_scan() function.
1483 19. For the "mail" command in an Exim filter, no default was being set for
1484 the once_repeat time, causing a random time value to be used if "once" was
1485 specified. (If the value happened to be <= 0, no repeat happened.) The
1486 default is now 0s, meaning "never repeat". The "vacation" command was OK
1487 (its default is 7d). It's somewhat surprising nobody ever noticed this bug
1488 (I found it when inspecting the code).
1490 20. There is now an overall timeout for performing a callout verification. It
1491 defaults to 4 times the callout timeout, which applies to individual SMTP
1492 commands during the callout. The overall timeout applies when there is more
1493 than one host that can be tried. The timeout is checked before trying the
1494 next host. This prevents very long delays if there are a large number of
1495 hosts and all are timing out (e.g. when the network connections are timing
1496 out). The value of the overall timeout can be changed by specifying an
1497 additional sub-option for "callout", called "maxwait". For example:
1499 verify = sender/callout=5s,maxwait=20s
1501 21. Add O_APPEND to the open() call for maildirsize files (Exim already seeks
1502 to the end before writing, but this should make it even safer).
1504 22. Exim was forgetting that it had advertised PIPELINING for the second and
1505 subsequent messages on an SMTP connection. It was also not resetting its
1506 memory on STARTTLS and an internal HELO.
1508 23. When Exim logs an SMTP synchronization error within a session, it now
1509 records whether PIPELINING has been advertised or not.
1511 24. Added 3 instances of "(long int)" casts to time_t variables that were being
1512 formatted using %ld, because on OpenBSD (and perhaps others), time_t is int
1513 rather than long int.
1515 25. Installed the latest Cygwin configuration files from the Cygwin maintainer.
1517 26. Added the never_mail option to autoreply.
1523 1. A reorganization of the code in order to implement 4.40/8 caused a daemon
1524 crash if the getsockname() call failed; this can happen if a connection is
1525 closed very soon after it is established. The problem was simply in the
1526 order in which certain operations were done, causing Exim to try to write
1527 to the SMTP stream before it had set up the file descriptor. The bug has
1528 been fixed by making things happen in the correct order.
1534 1. If "drop" was used in a DATA ACL, the SMTP output buffer was not flushed
1535 before the connection was closed, thus losing the rejection response.
1537 2. Commented out the definition of SOCKLEN_T in os.h-SunOS5. It is needed for
1538 some early Solaris releases, but causes trouble in current releases where
1539 socklen_t is defined.
1541 3. When std{in,out,err} are closed, re-open them to /dev/null so that they
1544 4. Minor refactoring of os.c-Linux to avoid compiler warning when IPv6 is not
1547 5. Refactoring in expand.c to improve memory usage. Pre-allocate a block so
1548 that releasing the top of it at the end releases what was used for sub-
1549 expansions (unless the block got too big). However, discard this block if
1550 the first thing is a variable or header, so that we can use its block when
1551 it is dynamic (useful for very large $message_headers, for example).
1553 6. Lookups now cache *every* query, not just the most recent. A new, separate
1554 store pool is used for this. It can be recovered when all lookup caches are
1555 flushed. Lookups now release memory at the end of their result strings.
1556 This has involved some general refactoring of the lookup sources.
1558 7. Some code has been added to the store_xxx() functions to reduce the amount
1559 of flapping under certain conditions.
1561 8. log_incoming_interface used to affect only the <= reception log lines. Now
1562 it causes the local interface and port to be added to several more SMTP log
1563 lines, for example "SMTP connection from", and rejection lines.
1565 9. The Sieve author supplied some patches for the doc/README.SIEVE file.
1567 10. Added a conditional definition of _BSD_SOCKLEN_T to os.h-Darwin.
1569 11. If $host_data was set by virtue of a hosts lookup in an ACL, its value
1570 could be overwritten at the end of the current message (or the start of a
1571 new message if it was set in a HELO ACL). The value is now preserved for
1572 the duration of the SMTP connection.
1574 12. If a transport had a headers_rewrite setting, and a matching header line
1575 contained an unqualified address, that address was qualified, even if it
1576 did not match any rewriting rules. The underlying bug was that the values
1577 of the flags that permit the existence of unqualified sender and recipient
1578 addresses in header lines (set by {sender,recipient}_unqualified_hosts for
1579 non-local messages, and by -bnq for local messages) were not being
1580 preserved with the message after it was received.
1582 13. When Exim was logging an SMTP synchronization error, it could sometimes log
1583 "next input=" as part of the text comprising the host identity instead of
1584 the correct text. The code was using the same buffer for two different
1585 strings. However, depending on which order the printing function evaluated
1586 its arguments, the bug did not always show up. Under Linux, for example, my
1587 test suite worked just fine.
1589 14. Exigrep contained a use of Perl's "our" scoping after change 4.31/70. This
1590 doesn't work with some older versions of Perl. It has been changed to "my",
1591 which in any case is probably the better facility to use.
1593 15. A really picky compiler found some instances of statements for creating
1594 error messages that either had too many or two few arguments for the format
1597 16. The size of the buffer for calls to the DNS resolver has been increased
1598 from 1024 to 2048. A larger buffer is needed when performing PTR lookups
1599 for addresses that have a lot of PTR records. This alleviates a problem; it
1600 does not fully solve it.
1602 17. A dnsdb lookup for PTR records that receives more data than will fit in the
1603 buffer now truncates the list and logs the incident, which is the same
1604 action as happens when Exim is looking up a host name and its aliases.
1605 Previously in this situation something unpredictable would happen;
1606 sometimes it was "internal error: store_reset failed".
1608 18. If a server dropped the connection unexpectedly when an Exim client was
1609 using GnuTLS and trying to read a response, the client delivery process
1610 crashed while trying to generate an error log message.
1612 19. If a "warn" verb in an ACL added multiple headers to a message in a single
1613 string, for example:
1615 warn message = H1: something\nH2: something
1617 the text was added as a single header line from Exim's point of view
1618 though it ended up OK in the delivered message. However, searching for the
1619 second and subsequent header lines using $h_h2: did not work. This has been
1620 fixed. Similarly, if a system filter added multiple headers in this way,
1621 the routers could not see them.
1623 20. Expanded the error message when iplsearch is called with an invalid key to
1624 suggest using net-iplsearch in a host list.
1626 21. When running tests using -bh, any delays imposed by "delay" modifiers in
1627 ACLs are no longer actually imposed (and a message to that effect is
1630 22. If a "gecos" field in a passwd entry contained escaped characters, in
1631 particular, if it contained a \" sequence, Exim got it wrong when building
1632 a From: or a Sender: header from that name. A second bug also caused
1633 incorrect handling when an unquoted " was present following a character
1634 that needed quoting.
1636 23. "{crypt}" as a password encryption mechanism for a "crypteq" expansion item
1637 was not being matched caselessly.
1639 24. Arranged for all hyphens in the exim.8 source to be escaped with
1642 25. Change 16 of 4.32, which reversed 71 or 4.31 didn't quite do the job
1643 properly. Recipient callout cache records were still being keyed to include
1644 the sender, even when use_sender was set false. This led to far more
1645 callouts that were necessary. The sender is no longer included in the key
1646 when use_sender is false.
1648 26. Added "control = submission" modifier to ACLs.
1650 27. Added the ${base62d: operator to decode base 62 numbers.
1652 28. dnsdb lookups can now access SRV records.
1654 29. CONFIGURE_OWNER can be set at build time to define an alternative owner for
1655 the configuration file.
1657 30. The debug message "delivering xxxxxx-xxxxxx-xx" is now output in verbose
1658 (-v) mode. This makes the output for a verbose queue run more intelligible.
1660 31. Added a use_postmaster feature to recipient callouts.
1662 32. Added the $body_zerocount variable, containing the number of binary zero
1663 bytes in the message body.
1665 33. The time of last modification of the "new" subdirectory is now used as the
1666 "mailbox time last read" when there is a quota error for a maildir
1669 34. Added string comparison operators lt, lti, le, lei, gt, gti, ge, gei.
1671 35. Added +ignore_unknown as a special item in host lists.
1673 36. Code for decoding IPv6 addresses in host lists is now included, even if
1674 IPv6 support is not being compiled. This fixes a bug in which an IPv6
1675 address was recognized as an IP address, but was then not correctly decoded
1676 into binary, causing unexpected and incorrect effects when compared with
1683 1. Very minor rewording of debugging text in manualroute to say "list of
1684 hosts" instead of "hostlist".
1686 2. If verify=header_syntax was set, and a header line with an unqualified
1687 address (no domain) and a large number of spaces between the end of the
1688 name and the colon was received, the reception process suffered a buffer
1689 overflow, and (when I tested it) crashed. This was caused by some obsolete
1690 code that should have been removed. The fix is to remove it!
1692 3. When running in the test harness, delay a bit after writing a bounce
1693 message to get a bit more predictability in the log output.
1695 4. Added a call to search_tidyup() just before forking a reception process. In
1696 theory, someone could use a lookup in the expansion of smtp_accept_max_
1697 per_host which, without the tidyup, could leave open a database connection.
1699 5. Added the variables $recipient_data and $sender_data which get set from a
1700 lookup success in an ACL "recipients" or "senders" condition, or a router
1701 "senders" option, similar to $domain_data and $local_part_data.
1703 6. Moved the writing of debug_print from before to after the "senders" test
1706 7. Change 4.31/66 (moving the time when the Received: is generated) caused
1707 problems for message scanning, either using a data ACL, or using
1708 local_scan() because the Received: header was not generated till after they
1709 were called (in order to set the time as the time of reception completion).
1710 I have revised the way this works. The header is now generated after the
1711 body is received, but before the ACL or local_scan() are called. After they
1712 are run, the timestamp in the header is updated.
1718 1. Change 4.24/6 introduced a bug because the SIGALRM handler was disabled
1719 before starting a queue runner without re-exec. This happened only when
1720 deliver_drop_privilege was set or when the Exim user was set to root. The
1721 effect of the bug was that timeouts during subsequent deliveries caused
1722 crashes instead of being properly handled. The handler is now left at its
1723 default (and expected) setting.
1725 2. The other case in which a daemon avoids a re-exec is to deliver an incoming
1726 message, again when deliver_drop_privilege is set or Exim is run as root.
1727 The bug described in (1) was not present in this case, but the tidying up
1728 of the other signals was missing. I have made the two cases consistent.
1730 3. The ignore_target_hosts setting on a manualroute router was being ignored
1731 for hosts that were looked up using the /MX notation.
1733 4. Added /ignore=<ip list> feature to @mx_any, @mx_primary, and @mx_secondary
1736 5. Change 4.31/55 was buggy, and broke when there was a rewriting rule that
1737 operated on the sender address. After changing the $sender_address to <>
1738 for the sender address verify, Exim was re-instated it as the original
1739 (before rewriting) address, but remembering that it had rewritten it, so it
1740 wasn't rewriting it again. This bug also had the effect of breaking the
1741 sender address verification caching when the sender address was rewritten.
1743 6. The ignore_target_hosts option was being ignored by the ipliteral router.
1744 This has been changed so that if the ip literal address matches
1745 ignore_target_hosts, the router declines.
1747 7. Added expansion conditions match_domain, match_address, and match_local_
1748 part (NOT match_host).
1750 8. The placeholder for the Received: header didn't have a length field set.
1752 9. Added code to Exim itself and to exim_lock to test for a specific race
1753 condition that could lead to file corruption when using MBX delivery. The
1754 issue is with the lockfile that is created in /tmp. If this file is removed
1755 after a process has opened it but before that process has acquired a lock,
1756 there is the potential for a second process to recreate the file and also
1757 acquire a lock. This could lead to two Exim processes writing to the file
1758 at the same time. The added code performs the same test as UW imapd; it
1759 checks after acquiring the lock that its file descriptor still refers to
1760 the same named file.
1762 10. The buffer for building added header lines was of fixed size, 8192 bytes.
1763 It is now parameterized by HEADER_ADD_BUFFER_SIZE and this can be adjusted
1766 11. Added the smtp_active_hostname option. If used, this will typically be made
1767 to depend on the incoming interface address. Because $interface_address is
1768 not set up until the daemon has forked a reception process, error responses
1769 that can happen earlier (such as "too many connections") no longer contain
1772 12. If an expansion in a condition on a "warn" statement fails because a lookup
1773 defers, the "warn" statement is abandoned, and the next ACL statement is
1774 processed. Previously this caused the whole ACL to be aborted.
1776 13. Added the iplsearch lookup type.
1778 14. Added ident_timeout as a log selector.
1780 15. Added tls_certificate_verified as a log selector.
1782 16. Added a global option tls_require_ciphers (compare the smtp transport
1783 option of the same name). This controls incoming TLS connections.
1785 17. I finally figured out how to make tls_require_ciphers do a similar thing
1786 in GNUtls to what it does in OpenSSL, that is, set up an appropriate list
1787 before starting the TLS session.
1789 18. Tabs are now shown as \t in -bP output.
1791 19. If the log selector return_path_on_delivery was set, Exim crashed when
1792 bouncing a message because it had too many Received: header lines.
1794 20. If two routers both had headers_remove settings, and the first one included
1795 a superfluous trailing colon, the final name in the first list and the
1796 first name in the second list were incorrectly joined into one item (with a
1797 colon in the middle).
1803 1. Added -C and -D options to the exinext utility, mainly to make it easier
1804 to include in the automated testing, but these could be helpful when
1805 multiple configurations are in use.
1807 2. The exinext utility was not formatting the output nicely when there was
1808 an alternate port involved in the retry record key, nor when there was a
1809 message id as well (for retries that were specific to a specific message
1810 and a specific host). It was also confused by IPv6 addresses, because of
1811 the additional colons they contain. I have fixed the IPv4 problem, and
1812 patched it up to do a reasonable job for IPv6.
1814 3. When there is an error after a MAIL, RCPT, or DATA SMTP command during
1815 delivery, the log line now contains "pipelined" if PIPELINING was used.
1817 4. An SMTP transport process used to panic and die if the bind() call to set
1818 an explicit outgoing interface failed. This has been changed; it is now
1819 treated in the same way as a connect() failure.
1821 5. A reference to $sender_host_name in the part of a conditional expansion
1822 that was being skipped was still causing a DNS lookup. This no longer
1825 6. The def: expansion condition was not recognizing references to header lines
1826 that used bh_ and bheader_.
1828 7. Added the _cache feature to named lists.
1830 8. The code for checking quota_filecount in the appendfile transport was
1831 allowing one more file than it should have been.
1833 9. For compatibility with Sendmail, the command line option
1841 and sets the incoming protocol and host name (for trusted callers). The
1842 host name and its colon can be omitted when only the protocol is to be set.
1843 Note the Exim already has two private options, -pd and -ps, that refer to
1844 embedded Perl. It is therefore impossible to set a protocol value of "d" or
1845 "s", but I don't think that's a major issue.
1847 10. A number of refactoring changes to the code, none of which should affect
1850 (a) The number of logging options was getting close to filling up the
1851 32-bit word that was used as a bit map. I have split them into two classes:
1852 those that are passed in the argument to log_write(), and those that are
1853 only ever tested independently outside of that function. These are now in
1854 separate 32-bit words, so there is plenty of room for expansion again.
1855 There is no change in the user interface or the logging behaviour.
1857 (b) When building, for example, log lines, the code previously used a
1858 macro that called string_cat() twice, in order to add two strings. This is
1859 not really sufficiently general. Furthermore, there was one instance where
1860 it was actually wrong because one of the argument was used twice, and in
1861 one call a function was used. (As it happened, calling the function twice
1862 did not affect the overall behaviour.) The macro has been replaced by a
1863 function that can join an arbitrary number of extra strings onto a growing
1866 (c) The code for expansion conditions now uses a table and a binary chop
1867 instead of a serial search (which was left over from when there were very
1868 few conditions). Also, it now recognizes conditions like "pam" even when
1869 the relevant support is not compiled in: a suitably worded error message is
1870 given if an attempt is made to use such a condition.
1872 11. Added ${time_interval:xxxxx}.
1874 12. A bug was causing one of the ddress fields not to be passed back correctly
1875 from remote delivery subprocesses. The field in question was not being
1876 subsequently used, so this caused to problems in practice.
1878 13. Added new log selectors queue_time and deliver_time.
1880 14. Might have fixed a bug in maildirsizefile handling that threw up
1881 "unexpected character" debug warnings, and recalculated the data
1882 unnecessarily. In any case, I expanded the warning message to give more
1885 15. Added the message "Restricted characters in address" to the statements in
1886 the default ACL that block characters like @ and % in local parts.
1888 16. Change 71 for release 4.31 proved to be much less benign that I imagined.
1889 Three changes have been made:
1891 (a) There was a serious bug; a negative response to MAIL caused the whole
1892 recipient domain to be cached as invalid, thereby blocking all messages
1893 to all local parts at the same domain, from all senders. This bug has
1894 been fixed. The domain is no longer cached after a negative response to
1895 MAIL if the sender used is not empty.
1897 (b) The default behaviour of using MAIL FROM:<> for recipient callouts has
1900 (c) A new callout option, "use_sender" has been added for people who want
1901 the modified behaviour.
1907 1. Removed "EXTRALIBS=-lwrap" from OS/Makefile-Unixware7 on the advice of
1910 2. Removed "LIBS = -lresolv" from OS/Makefile-Darwin as it is not needed, and
1911 indeed breaks things for older releases.
1913 3. Added additional logging to the case where there is a problem reading data
1914 from a filter that is running in a subprocess using a pipe, in order to
1915 try to track down a specific problem.
1917 4. Testing facility fudge: when running in the test harness and attempting
1918 to connect to 10.x.x.x (expecting a connection timeout) I'm now sometimes
1919 getting "No route to host". Convert this to a timeout.
1921 5. Define ICONV_ARG2_TYPE as "char **" for Unixware7 to avoid compiler
1924 6. Some OS don't have socklen_t but use size_t instead. This affects the
1925 fifth argument of getsockopt() amongst other things. This is now
1926 configurable by a macro called SOCKLEN_T which defaults to socklen_t, but
1927 can be set for individual OS. I have set it for SunOS5, OSF1, and
1928 Unixware7. Current versions of SunOS5 (aka Solaris) do have socklen_t, but
1929 some earlier ones do not.
1931 7. Change 4.30/15 was not doing the test caselessly.
1933 8. The standard form for an IPv6 address literal was being rejected by address
1934 parsing in, for example, MAIL and RCPT commands. An example of this kind of
1935 address is [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
1936 this, as well as the form without the "IPv6" on the front (but only when
1937 address literals are enabled, of course).
1939 9. Added some casts to avoid compiler warnings in OS/os.c-Linux.
1941 10. Exim crashed if a message with an empty sender address specified by -f
1942 encountered a router with an errors_to setting. This could be provoked only
1943 by a command such as
1947 where an empty string was supplied; "<>" did not hit this bug.
1949 11. Installed PCRE release 4.5.
1951 12. If EHLO/HELO was rejected by an ACL, the value of $sender_helo_name
1952 remained set. It is now erased.
1954 13. exiqgrep wasn't working on MacOS X because it didn't correctly compute
1955 times from message ids (which are base 36 rather than the normal 62).
1957 14. "Expected" SMTP protocol errors that can arise when PIPELINING is in use
1958 were being counted as actual protocol errors, and logged if the log
1959 selector +smtp_protocol_error was set. One cannot be perfect in this test,
1960 but now, if PIPELINING has been advertised, RCPT following a rejected MAIL,
1961 and DATA following a set of rejected RCPTs do not count as protocol errors.
1962 In other words, Exim assumes they were pipelined, though this may not
1963 actually be the case. Of course, in all cases the client gets an
1964 appropriate error code.
1966 15. If a lookup fails in an ACL condition, a message about the failure may
1967 be available; it is used if testing the ACL cannot continue, because most
1968 such messages specify what the cause of the deferral is. However, some
1969 messages (e.g. "MYSQL: no data found") do not cause a defer. There was bug
1970 that caused an old message to be retained and used if a later statement
1971 caused a defer, replacing the real cause of the deferral.
1973 16. If an IP address had so many PTR records that the DNS lookup buffer
1974 was not large enough to hold them, Exim could crash while trying to process
1975 the truncated data. It now detects and logs this case.
1977 17. Further to 4.21/58, another change has been made: if (and only if) the
1978 first line of a message (the first header line) ends with CRLF, a bare LF
1979 in a subsequent header line has a space inserted after it, so as not to
1980 terminate the header.
1982 18. Refactoring: tidied an ugly bit of code in appendfile that copied data
1983 unnecessarily, used atoi() instead of strtol(), and didn't check the
1984 termination when getting file sizes from file names by regex.
1986 19. Completely re-implemented the support for maildirsize files, in the light
1987 of a number of problems with the previous contributed implementation
1988 (4.30/29). In particular:
1990 . If the quota is zero, the maildirsize file is maintained, but no quota is
1993 . If the maildir directory does not exist, it is created before any attempt
1994 to write a maildirsize file.
1996 . The quota value in the file is just a cache; if the quota is changed in
1997 the transport, the new value overrides.
1999 . A regular expression is available for excluding directories from the
2002 20. The autoreply transport checks the characters in options that define the
2003 message's headers; it allows continued headers, but it was checking with
2004 isspace() after an embedded newline instead of explicitly looking for a
2007 21. If all the "regular" hosts to which an address was routed had passed their
2008 expiry times, and had not reached their retry times, the address was
2009 bounced, even if fallback hosts were defined. Now Exim should go on to try
2012 22. Increased buffer sizes in the callout code from 1024 to 4096 to match the
2013 equivalent code in the SMTP transport. Some hosts send humungous responses
2014 to HELO/EHLO, more than 1024 it seems.
2016 23. Refactoring: code in filter.c used (void *) for "any old type" but this
2017 gives compiler warnings in some environments. I've now done it "properly",
2020 24. The replacement for inet_ntoa() that is used with gcc on IRIX systems
2021 (because of problems with the built-in one) was declared to return uschar *
2022 instead of char *, causing compiler failure.
2024 25. Fixed a file descriptor leak when processing alias/forward files.
2026 26. Fixed a minor format string issue in dbfn.c.
2028 27. Typo in exim.c: ("dmbnz" for "dbmnz").
2030 28. If a filter file refered to $h_xxx or $message_headers, and the headers
2031 contained RFC 2047 "words", Exim's memory could, under certain conditions,
2034 29. When a sender address is verified, it is cached, to save repeating the test
2035 when there is more than one recipient in a message. However, when the
2036 verification involves a callout, it is possible for different callout
2037 options to be set for different recipients. It is too complicated to keep
2038 track of this in the cache, so now Exim always runs a verification when a
2039 callout is required, relying on the callout cache for the optimization.
2040 The overhead is duplication of the address routing, but this should not be
2043 30. Fixed a bug in callout caching. If a RCPT command caused the sender address
2044 to be verified with callout=postmaster, and the main callout worked but the
2045 postmaster check failed, the verification correctly failed. However, if a
2046 subsequent RCPT command asked for sender verification *without* the
2047 postmaster check, incorrect caching caused this verification also to fail,
2050 31. Exim caches DNS lookup failures so as to avoid multiple timeouts; however,
2051 it was not caching the DNS options (qualify_single, search_parents) that
2052 were used when the lookup failed. A subsequent lookup with different
2053 options therefore always gave the same answer, though there were cases
2054 where it should not have. (Example: a "domains = !$mx_any" option on a
2055 dnslookup router: the "domains" option is always processed without any
2056 widening, but the router might have qualify_single set.) Now Exim uses the
2057 cached value only when the same options are set.
2059 32. Added John Jetmore's "exipick" utility to the distribution.
2061 33. GnuTLS: When an attempt to start a TLS session fails for any reason other
2062 than a timeout (e.g. a certificate is required, and is not provided), an
2063 Exim server now closes the connection immediately. Previously it waited for
2064 the client to close - but if the client is SSL, it seems that they each
2065 wait for each other, leading to a delay before one of them times out.
2067 34: GnuTLS: Updated the code to use the new GnuTLS 1.0.0 API. I have not
2068 maintained 0.8.x compatibility because I don't think many are using it, and
2069 it is clearly obsolete.
2071 35. Added TLS support for CRLs: a tls_crl global option and one for the smtp
2074 36. OpenSSL: $tls_certificate_verified was being set to 1 even if the
2075 client certificate was expired. A simple patch fixes this, though I don't
2076 understand the full logic of why the verify callback is called multiple
2079 37. OpenSSL: a patch from Robert Roselius: "Enable client-bug workaround.
2080 Versions of OpenSSL as of 0.9.6d include a 'CBC countermeasure' feature,
2081 which causes problems with some clients (such as the Certicom SSL Plus
2082 library used by Eudora). This option, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS,
2083 disables the coutermeasure allowing Eudora to connect."
2085 38. Exim was not checking that a write() to a log file succeeded. This could
2086 lead to Bad Things if a log got too big, in particular if it hit a file
2087 size limit. Exim now panics and dies if it cannot write to a log file, just
2088 as it does if it cannot open a log file.
2090 39. Modified OS/Makefile-Linux so that it now contains
2092 CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
2094 The two -D definitions ensure that Exim is compiled with large file
2095 support, which makes it possible to handle log files that are bigger than
2098 40. Fixed a subtle caching bug: if (in an ACL or a set of routers, for
2099 instance) a domain was checked against a named list that involved a lookup,
2100 causing $domain_data to be set, then another domain was checked against the
2101 same list, then the first domain was re-checked, the value of $domain_data
2102 after the final check could be wrong. In particular, if the second check
2103 failed, it could be set empty. This bug probably also applied to
2106 41. The strip_trailing_dot option was not being applied to the address given
2107 with the -f command-line option.
2109 42. The code for reading a message's header from the spool was incrementing
2110 $received_count, but never initializing it. This meant that the value was
2111 incorrect (doubled) while delivering a message in the same process in which
2112 it was received. In the most common configuration of Exim, this never
2113 happens - a fresh exec is done - but it can happen when
2114 deliver_drop_privilege is set.
2116 43. When Exim logs an SMTP synchronization error - client data sent too soon -
2117 it now includes up to 150 characters of the unexpected data in the log
2120 44. The exim_dbmbuild utility uses fixed size buffers for reading input lines
2121 and building data strings. The size of both of these buffers was 10 000
2122 bytes - far larger than anybody would *ever* want, thought I. Needless to
2123 say, somebody hit the limit. I have increased the maximum line length to
2124 20 000 and the maximum data length of concatenated lines to 100 000. I have
2125 also fixed two bugs, because there was no checking on these buffers. Tsk,
2126 tsk. Now exim_dbmbuild gives a message and exits with an error code if a
2127 buffer is too small.
2129 45. The exim_dbmbuild utility did not support quoted keys, as Exim does in
2130 lsearch lookups. Now it does.
2132 46. When parsing a route_list item in a manualroute router, a fixed-length
2133 buffer was used for the list of hosts. I made this 1024 bytes long,
2134 thinking that nobody would ever have a list of hosts that long. Wrong.
2135 Somebody had a whole pile of complicated expansion conditions, and the
2136 string was silently truncated, leading to an expansion error. It turns out
2137 that it is easier to change to an unlimited length (owing to other changes
2138 that have happened since this code was originally written) than to build
2139 structure for giving a limitation error. The length of the item that
2140 expands into the list of hosts is now unlimited.
2142 47. The lsearch lookup could not handle data where the length of text line was
2143 more than 4095 characters. Such lines were truncated, leading to shortened
2144 data being returned. It should now handle lines of any length.
2146 48. Minor wording revision: "cannot test xxx in yyy ACL" becomes "cannot test
2147 xxx condition in yyy ACL" (e.g. "cannot test domains condition in DATA
2150 49. Cosmetic tidy to scripts like exicyclog that are generated by globally
2151 replacing strings such as BIN_DIRECTORY in a source file: the replacement
2152 no longer happens in comment lines. A list of replacements is now placed
2153 at the head of all of the source files, except those whose only change is
2154 to replace PERL_COMMAND in the very first #! line.
2156 50. Replaced the slow insertion sort in queue.c, for sorting the list of
2157 messages on the queue, with a bottom-up merge sort, using code contributed
2158 by Michael Haardt. This should make operations like -bp somewhat faster on
2159 large queues. It won't affect queue runners, except when queue_run_in_order
2162 51. Installed eximstats 1.31 in the distribution.
2164 52. Added support for SRV lookups to the dnslookup router.
2166 53. If an ACL referred to $message_body or $message_body_end, the value was not
2167 reset for any messages that followed in the same SMTP session.
2169 54. The store-handling optimization for building very long strings was not
2170 differentiating between the different store pools. I don't think this
2171 actually made any difference in practice, but I've tidied it.
2173 55. While running the routers to verify a sender address, $sender_address
2174 was still set to the sender address. This is wrong, because when routing to
2175 send a bounce to the sender, it would be empty. Therefore, I have changed
2176 it so that, while verifying a sender address, $sender_address is set to <>.
2177 (There is no change to what happens when verifying a recipient address.)
2179 56. After finding MX (or SRV) records, Exim was doing a DNS lookup for the
2180 target A or AAAA records (if not already returned) without resetting the
2181 qualify_single or search_parents options of the DNS resolver. These are
2182 inappropriate in this case because the targets of MX and SRV records must
2183 be FQDNs. A broken DNS record could cause trouble if it happened to have a
2184 target that, when qualified, matched something in the local domain. These
2185 two options are now turned off when doing these lookups.
2187 57. It seems that at least some releases of Reiserfs (which does not have the
2188 concept of a fixed number of inodes) returns zero and not -1 for the
2189 number of available inodes. This interacted badly with check_spool_inodes,
2190 which assumed that -1 was the "no such thing" setting. What I have done is
2191 to check that the total number of inodes is greater than zero before doing
2192 the test of how many are available.
2194 58. When a "warn" ACL statement has a log_message modifier, the message is
2195 remembered, and not repeated. This is to avoid a lot of repetition when a
2196 message has many recipients that cause the same warning to be written.
2197 Howewer, Exim was preserving the list of already written lines for an
2198 entire SMTP session, which doesn't seem right. The memory is now reset if a
2199 new message is started.
2201 59. The "rewrite" debugging flag was not showing the result of rewriting in the
2202 debugging output unless log_rewrite was also set.
2204 60. Avoid a compiler warning on 64-bit systems in dsearch.c by avoiding the use
2205 of (int)(handle) when we know that handle contains (void *)(-1).
2207 61. The Exim daemon panic-logs an error return when it closes the incoming
2208 connection. However "connection reset by peer" seems to be common, and
2209 isn't really an error worthy of noting specially, so that particular error
2212 62. When Exim is trying to find all the local interfaces, it used to panic and
2213 die if the ioctl to get the interface flags failed. However, it seems that
2214 on at least one OS (Solaris 9) it is possible to have an interface that is
2215 included in the list of interfaces, but for which you get a failure error
2216 for this call. This happens when the interface is not "plumbed" into a
2217 protocol (i.e. neither IPv4 nor IPv6). I've changed the code so that a
2218 failure of the "get flags" call assumes that the interface is down.
2220 63. Added a ${eval10: operator, which assumes all numbers are decimal. This
2221 makes life easier for people who are doing arithmetic on fields extracted
2222 from dates, where you often get leading zeros that should not be
2223 interpreted as octal.
2225 64. Added qualify_domain to the redirect router, to override the global
2228 65. If a pathologically long header line contained very many addresses (the
2229 report of this problem mentioned 10 000) and each of them was rewritten,
2230 Exim could use up a very large amount of memory. (It kept on making new
2231 copies of the header line as it rewrote, and never released the old ones.)
2232 At the expense of a bit more processing, the header rewriting function has
2233 been changed so that it no longer eats memory in this way.
2235 66. The generation of the Received: header has been moved from the time that a
2236 message starts to be received, to the time that it finishes. The timestamp
2237 in the Received: header should now be very close to that of the <= log
2238 line. There are two side-effects of this change:
2240 (a) If a message is rejected by a DATA or non-SMTP ACL or local_scan(), the
2241 logged header lines no longer include the local Received: line, because
2242 it has not yet been created. The same applies to a copy of the message
2243 that is returned to a non-SMTP sender when a message is rejected.
2245 (b) When a filter file is tested using -bf, no additional Received: header
2246 is added to the test message. After some thought, I decided that this
2249 This change does not affect the value of $received_for. It is still set
2250 after address rewriting, but before local_scan() is called.
2252 67. Installed the latest Cygwin-specific files from the Cygwin maintainer.
2254 68. GnuTLS: If an empty file is specified for tls_verify_certificates, GnuTLS
2255 gave an unhelpful panic error message, and a defer error. I have managed to
2256 change this behaviour so that it now rejects any supplied certificate,
2257 which seems right, as the list of acceptable certificates is empty.
2259 69. OpenSSL: If an empty file is specified for tls_verify_certificates, OpenSSL
2260 gave an unhelpful defer error. I have not managed to make this reject any
2261 supplied certificates, but the error message it gives is "no certificate
2262 supplied", which is not helpful.
2264 70. exigrep's output now also includes lines that are not associated with any
2265 message, but which match the given pattern. Implemented by a patch from
2266 Martin Sluka, which also tidied up the Perl a bit.
2268 71. Recipient callout verification, like sender verification, was using <> in
2269 the MAIL FROM command. This isn't really the right thing, since the actual
2270 sender may affect whether the remote host accepts the recipient or not. I
2271 have changed it to use the actual sender in the callout; this means that
2272 the cache record is now keyed on a recipient/sender pair, not just the
2273 recipient address. There doesn't seem to be a real danger of callout loops,
2274 since a callout by the remote host to check the sender would use <>.
2275 [SEE ABOVE: changed after hitting problems.]
2277 72. Exim treats illegal SMTP error codes that do not begin with 4 or 5 as
2278 temporary errors. However, in the case of such a code being given after
2279 the end of a data transmission (i.e. after ".") Exim was failing to write
2280 a retry record for the message. (Yes, there was some broken host that was
2281 actually sending 8xx at this point.)
2283 73. An unknown lookup type in a host list could cause Exim to panic-die when
2284 the list was checked. (An example that provoked this was putting <; in the
2285 middle of a list instead of at the start.) If this happened during a DATA
2286 ACL check, a -D file could be left lying around. This kind of configuration
2287 error no longer causes Exim to die; instead it causes a defer errror. The
2288 incident is still logged to the main and panic logs.
2290 74. Buglet left over from Exim 3 conversion. The message "too many messages
2291 in one connection" was written to the rejectlog but not the mainlog, except
2292 when address rewriting (yes!) was being logged.
2294 75. Added write_rejectlog option.
2296 76. When a system filter was run not as root (that is, when system_filter_user
2297 was set), the values of the $n variables were not being returned to the
2298 main process; thus, they were not subsequently available in the $sn
2301 77. Added +return_path_on_delivery log selector.
2303 78. A connection timeout was being treated differently from recipients deferred
2304 when testing hosts_max_try with a message that was older than the host's
2305 retry timeout. (The host should not be counted, thus allowing all hosts to
2306 be tried at least once before bouncing.) This may have been the cause of an
2307 occasionally reported bug whereby a message would remain on the queue
2308 longer than the retry timeout, but would be bounced if a delivery was
2309 forced. I say "may" because I never totally pinned down the problem;
2310 setting up timeout/retry tests is difficult. See also the next item.
2312 79. The ultimate address timeout was not being applied to errors that involved
2313 a combination of host plus message (for example, a timeout on a MAIL
2314 command). When an address resolved to a number of possible hosts, and they
2315 were not all tried for each delivery (e.g. because of hosts_max_try), a
2316 message could remain on the queue longer than the retry timeout.
2318 80. Sieve bug: "stop" inside "elsif" was broken. Applied a patch from Michael
2321 81. Fixed an obscure SMTP outgoing bug which required at least the following
2322 conditions: (a) there was another message waiting for the same server;
2323 (b) the server returned 5xx to all RCPT commands in the first message so
2324 that the message was not completed; (c) the server dropped the connection
2325 or gave a negative response to the RSET that Exim sends to abort the
2326 transaction. The observed case was a dropped connection after DATA that had
2327 been sent in pipelining mode. That is, the server had advertised PIPELINING
2328 but was not implementing it correctly. The effect of the bug was incorrect
2329 behaviour, such as trying another host, and this could lead to a crash.
2335 1. The 3rd arguments to getsockname(), getpeername(), and accept() in exim.c
2336 and daemon.c were passed as pointers to ints; they should have been
2337 pointers to socklen_t variables (which are typically unsigned ints).
2339 2. Some signed/unsigned type warnings in the os.c file for Linux have been
2342 3. Fixed a really odd bug that affected only the testing scheme; patching a
2343 certain fixed string in the binary changed the value of another string that
2344 happened to be identical to the end of the original first string.
2346 4. When gethostbyname() (or equivalent) is passed an IP address as a "host
2347 name", it returns that address as the IP address. On some operating
2348 systems (e.g. Solaris), it also passes back the IP address string as the
2349 "host name". However, on others (e.g. Linux), it passes back an empty
2350 string. Exim wasn't checking for this, and was changing the host name to an
2351 empty string, assuming it had been canonicized.
2353 5. Although rare, it is permitted to have more than one PTR record for a given
2354 IP address. I thought that gethostbyaddr() or getipnodebyaddr() always gave
2355 all the names associated with an address, because they do in Solaris.
2356 However, it seems that they do not in Linux for data that comes from the
2357 DNS. If an address in /etc/hosts has multiple names, they _are_ all given.
2358 I found this out when I moved to a new Linux workstation and tried to run
2359 the Exim test suite.
2361 To get round this problem I have changed the code so that it now does its
2362 own call to the DNS to look up PTR records when searching for a host name.
2363 If nothing can be found in the DNS, it tries gethostbyaddr(), so that
2364 addresses that are only in /etc/hosts are still found.
2366 This behaviour is, however, controlled by an option called host_lookup_
2367 order, which defaults to "bydns:byaddr". If people want to use the other
2368 order, or indeed, just use one or the other means of lookup, they can
2369 specify it in this variable.
2371 6. If a PTR record yields an empty name, Exim treats it as non-existent. In
2372 some operating systems, this comes back from gethostbyaddr() as an empty
2373 string, and this is what Exim used to test for. However, it seems that in
2374 other systems, "." is yielded. Exim now tests for this case too.
2376 7. The values of check_spool_space and check_log_space are now held internally
2377 as a number of kilobytes instead of an absolute number of bytes. If a
2378 numbers is specified without 'K' or 'M', it is rounded up to the nearest
2379 kilobyte. This means that much larger values can be stored.
2381 8. Exim monitor: an attempt to get the action menu when not actually pointing
2382 at a message produces an empty menu entitled "No message selected". This
2383 works on Solaris (OpenWindows). However, XFree86 does not like a menu with
2384 no entries in it ("Shell widget menu has zero width and/or height"). So I
2385 have added a single, blank menu entry in this case.
2387 9. Added ${quote_local_part.
2389 10. MIME decoding is now applied to the contents of Subject: header lines when
2392 11. Now that a reference to $sender_host_address automatically causes a reverse
2393 lookup to occur if necessary (4.13/18), there is no need to arrange for a
2394 host lookup before query-style lookups in lists that might use this
2395 variable. This has therefore been abolished, and the "net-" prefix is no
2396 longer necessary for query-style lookups.
2398 12. The Makefile for SCO_SV contained a setting of LDFLAGS. This appears to
2399 have been a typo for LFLAGS, so it has been changed.
2401 13. The install script calls Exim with "-C /dev/null" in order to find the
2402 version number. If ALT_CONFIG_PREFIX was set, this caused an error message
2403 to be output. Howeve, since Exim outputs its version number before the
2404 error, it didn't break the script. It just looked ugly. I fixed this by
2405 always allowing "-C /dev/null" if the caller is root.
2407 14. Ignore overlarge ACL variable number when reading spool file - insurance
2408 against a later release with more variables having written the file.
2410 15. The standard form for an IPv6 address literal was being rejected by EHLO.
2411 Example: [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
2412 this, as well as the form without the "IPv6" on the front.
2414 16. Added CHOWN_COMMAND=/usr/sbin/chown and LIBS=-lresolv to the
2415 OS/Makefile-Darwin file.
2417 17. Fixed typo in lookups/ldap.c: D_LOOKUP should be D_lookup. This applied
2418 only to LDAP libraries that do not have LDAP_OPT_DEREF.
2420 18. After change 4.21/52, "%ld" was used to format the contents of the $inode
2421 variable. However, some OS use ints for inodes. I've added cast to long int
2422 to get rid of the compiler warning.
2424 19. I had forgotten to lock out "/../" in configuration file names when
2425 ALT_CONFIG_PREFIX was set.
2427 20. Routers used for verification do not need to specify transports. However,
2428 if such a router generated a host list, and callout was configured, Exim
2429 crashed, because it could not find a port number from the (non-existent)
2430 transport. It now assumes port 25 in this circumstance.
2432 21. Added the -t option to exigrep.
2434 22. If LOOKUP_LSEARCH is defined, all three linear search methods (lsearch,
2435 wildlsearch, nwildlsearch) are compiled. LOOKUP_WILDLSEARCH and LOOKUP_
2436 NWILDLSEARCH are now obsolete, but retained for compatibility. If either of
2437 them is set, LOOKUP_LSEARCH is forced.
2439 23. "exim -bV" now outputs a list of lookups that are included in the binary.
2441 24. Added sender and host information to the "rejected by local_scan()" log
2442 line; previously there was no indication of these.
2444 25. Added .include_if_exists.
2446 26. Change 3.952/11 added an explicit directory sync on top of a file sync for
2447 Linux. It turns out that not all file systems support this. Apparently some
2448 versions of NFS do not. (It's rare to put Exim's spool on NFS, but people
2449 do it.) To cope with this, the error EINVAL, which means that sync-ing is
2450 not supported on the file descriptor, is now ignored when Exim is trying to
2451 sync a directory. This applies only to Linux.
2453 27. Added -DBIND_8_COMPAT to the CLFAGS setting for Darwin.
2455 28. In Darwin (MacOS X), the PAM headers are in /usr/include/pam and not in
2456 /usr/include/security. There's now a flag in OS/os.h-Darwin to cope with
2459 29. Added support for maildirsize files from supplied patch (modified a bit).
2461 30. The use of :fail: followed by an empty string could lead Exim to respond to
2462 sender verification failures with (e.g.):
2464 550 Verification failed for <xxx>
2465 550 Sender verify failed
2467 where the first response line was missing the '-' that indicates it is not
2468 the final line of the response.
2470 31. The loop for finding the name of the user that called Exim had a hardwired
2471 limit of 10; it now uses the value of finduser_retries, which is used for
2472 all other user lookups.
2474 32. Added $received_count variable, available in data and not_smtp ACLs, and at
2477 33. Exim was neglecting to zero errno before one call of strtol() when
2478 expanding a string and expecting an integer value. On some systems this
2479 resulted in spurious "integer overflow" errors. Also, it was casting the
2480 result into an int without checking.
2482 34. Testing for a connection timeout using "timeout_connect" in the retry rules
2483 did not work. The code looks as if it has *never* worked, though it appears
2484 to have been documented since at least releast 1.62. I have made it work.
2486 35. The "timeout_DNS" error in retry rules, also documented since at least
2487 1.62, also never worked. As it isn't clear exactly what this means, and
2488 clearly it isn't a major issue, I have abolished the feature by treating it
2489 as "timeout", and writing a warning to the main and panic logs.
2491 36. The display of retry rules for -brt wasn't always showing the error code
2494 37. Added new error conditions to retry rules: timeout_A, timeout_MX,
2495 timeout_connect_A, timeout_connect_MX.
2497 38. Rewriting the envelope sender at SMTP time did not allow it to be rewritten
2498 to the empty sender.
2500 39. The daemon was not analysing the content of -oX till after it had closed
2501 stderr and disconnected from the controlling terminal. This meant that any
2502 syntax errors were only noted on the panic log, and the return code from
2503 the command was 0. By re-arranging the code a little, I've made the
2504 decoding happen first, so such errors now appear on stderr, and the return
2505 code is 1. However, the actual setting up of the sockets still happens in
2506 the disconnected process, so errors there are still only recorded on the
2509 40. A daemon listener on a wildcard IPv6 socket that also accepts IPv4
2510 connections (as happens on some IP stacks) was logged at start up time as
2511 just listening for IPv6. It now logs "IPv6 with IPv4". This differentiates
2512 it from "IPv6 and IPv4", which means that two separate sockets are being
2515 41. The debug output for gethostbyname2() or getipnodebyname() failures now
2516 says whether AF_INET or AF_INET6 was passed as an argument.
2518 42. Exiwhat output was messed up when time zones were included in log
2521 43. Exiwhat now gives more information about the daemon's listening ports,
2522 and whether -tls-on-connect was used.
2524 44. The "port" option of the smtp transport is now expanded.
2526 45. A "message" modifier in a "warn" statement in a non-message ACL was being
2527 silently ignored. Now an error message is written to the main and panic
2530 46. There's a new ACL modifier called "logwrite" which writes to a log file
2531 as soon as it is encountered.
2533 47. Added $local_user_uid and $local_user_gid at routing time.
2535 48. Exim crashed when trying to verify a sender address that was being
2538 49. Exim was recognizing only a space character after ".include". It now also
2539 recognizes a tab character.
2541 50. Fixed several bugs in the Perl script that creates the exim.8 man page by
2542 extracting the relevant information from the specification. The man page no
2543 longer contains scrambled data for the -d option, and I've added a section
2544 at the front about calling Exim under different names.
2546 51. Added "extra_headers" argument to the "mail" command in filter files.
2548 52. Redirecting mail to an unqualified address in a Sieve filter caused Exim to
2551 53. Installed eximstats 1.29.
2553 54. Added transport_filter_timeout as a generic transport option.
2555 55. Exim no longer adds an empty Bcc: header to messages that have no To: or
2556 Cc: header lines. This was required by RFC 822, but it not required by RFC
2559 56. Exim used to add From:, Date:, and Message-Id: header lines to any
2560 incoming messages that did not have them. Now it does so only if the
2561 message originates locally, that is, if there is no associated remote host
2562 address. When Resent- header lines are present, this applies to the Resent-
2563 lines rather than the non-Resent- lines.
2565 57. Drop incoming SMTP connection after too many syntax or protocol errors. The
2566 limit is controlled by smtp_max_synprot_errors, defaulting to 3.
2568 58. Messages for configuration errors now include the name of the main
2569 configuration file - useful now that there may be more than one file in a
2570 list (.included file names were always shown).
2572 59. Change 4.21/82 (run initgroups() when starting the daemon) causes problems
2573 for those rare installations that do not start the daemon as root or run it
2574 setuid root. I've cut out the call to initgroups() if the daemon is not
2577 60. The Exim user and group can now be bound into the binary as text strings
2578 that are looked up at the start of Exim's processing.
2580 61. Applied a small patch for the Interbase code, supplied by Ard Biesheuvel.
2582 62. Added $mailstore_basename variable.
2584 63. Installed patch to sieve.c from Michael Haardt.
2586 64. When Exim failed to open the panic log after failing to open the main log,
2587 the original message it was trying to log was written to stderr and debug
2588 output, but if they were not available (the usual case in production), it
2589 was lost. Now it is written to syslog before the two lines that record the
2590 failures to open the logs.
2592 65. Users' Exim filters run in subprocesses under the user's uid. It is
2593 possible for a "deliver" command or an alias in a "personal" command to
2594 provoke an address rewrite. If logging of address rewriting is configured,
2595 this fails because the process is not running as root or exim. There may be
2596 a better way of dealing with this, but for the moment (because 4.30 needs
2597 to be released), I have disabled address rewrite logging when running a
2598 filter in a non-root, non-exim process.
2604 1. The buildconfig auxiliary program wasn't quoting the value set for
2605 HEADERS_CHARSET. This caused a compilation error complaining that 'ISO' was
2606 not defined. This bug was masked in 4.22 by the effect that was fixed in
2609 2. Some messages that were rejected after a message id was allocated were
2610 shown as "incomplete" by exigrep. It no longer does this for messages that
2611 are rejected by local_scan() or the DATA or non-SMTP ACLs.
2613 3. If a Message-ID: header used a domain literal in the ID, and Exim did not
2614 have allow_domain_literals set, the ID did not get logged in the <= line.
2615 Domain literals are now always recognized in Message-ID: header lines.
2617 4. The first argument for a ${extract expansion item is the key name or field
2618 number. Leading and trailing spaces in this item were not being ignored,
2619 causing some misleading effects.
2621 5. When deliver_drop_privilege was set, single queue runner processes started
2622 manually (i.e. by the command "exim -q") or by the daemon (which uses the
2623 same command in the process it spins off) were not dropping privilege.
2625 6. When the daemon running as "exim" started a queue runner, it always
2626 re-executed Exim in the spun-off process. This is a waste of effort when
2627 deliver_drop_privilege is set. The new process now just calls the
2628 queue-runner function directly.
2634 1. Typo in the src/EDITME file: it referred to HEADERS_DECODE_TO instead of
2637 2. Change 4.21/73 introduced a bug. The pid file path set by -oP was being
2638 ignored. Though the use of -oP was forcing the writing of a pid file, it
2639 was always written to the default place.
2641 3. If the message "no IP address found for host xxxx" is generated during
2642 incoming verification, it is now followed by identification of the incoming
2643 connection (so you can more easily find what provoked it).
2645 4. Bug fix for Sieve filters: "stop" inside a block was not working properly.
2647 5. Added some features to "harden" Exim a bit more against certain attacks:
2649 (a) There is now a build-time option called FIXED_NEVER_USERS that can
2650 be put in Local/Makefile. This is like the never_users runtime option,
2651 but it cannot be overridden. The default setting is "root".
2653 (b) If ALT_CONFIG_PREFIX is defined in Local/Makefile, it specifies a
2654 prefix string with which any file named in a -C command line option
2657 (c) If ALT_CONFIG_ROOT_ONLY is defined in Local/Makefile, root privilege
2658 is retained for -C and -D only if the caller of Exim is root. Without
2659 it, the exim user may also use -C and -D and retain privilege.
2661 (d) If DISABLE_D_OPTION is defined in Local/Makefile, the use of the -D
2662 command line option is disabled.
2664 6. Macro names set by the -D option must start with an upper case letter, just
2665 like macro names defined in the configuration file.
2667 7. Added "dereference=" facility to LDAP.
2669 8. Two instances of the typo "uknown" in the source files are fixed.
2671 9. If a PERL_COMMAND setting in Local/Makefile was not at the start of a line,
2672 the Configure-Makefile script screwed up while processing it.
2674 10. Incorporated PCRE 4.4.
2676 11. The SMTP synchronization check was not operating right at the start of an
2677 SMTP session. For example, it could not catch a HELO sent before the client
2678 waited for the greeting. There is now a check for outstanding input at the
2679 point when the greeting is written. Because of the duplex, asynchronous
2680 nature of TCP/IP, it cannot be perfect - the incorrect input may be on its
2681 way, but not yet received, when the check is performed.
2683 12. Added tcp_nodelay to make it possible to turn of the setting of TCP_NODELAY
2684 on TCP/IP sockets, because this apparently causes some broken clients to
2687 13. Installed revised OS/Makefile-CYGWIN and OS/os.c-cygwin (the .h file was
2688 unchanged) from the Cygwin maintainer.
2690 14. The code for -bV that shows what is in the binary showed "mbx" when maildir
2691 was supported instead of testing for mbx. Effectively a typo.
2693 15. The spa authenticator server code was not checking that the input it
2694 received was valid base64.
2696 16. The debug output line for the "set" modifier in ACLs was not showing the
2697 name of the variable that was being set.
2699 17. Code tidy: the variable type "vtype_string" was never used. Removed it.
2701 18. Previously, a reference to $sender_host_name did not cause a DNS reverse
2702 lookup on its own. Something else was needed to trigger the lookup. For
2703 example, a match in host_lookup or the need for a host name in a host list.
2704 Now, if $sender_host_name is referenced and the host name has not yet been
2705 looked up, a lookup is performed. If the lookup fails, the variable remains
2706 empty, and $host_lookup_failed is set to "1".
2708 19. Added "eqi" as a case-independent comparison operator.
2710 20. The saslauthd authentication condition could segfault if neither service
2711 nor realm was specified.
2713 21. If an overflowing value such as "2048M" was set for message_size_limit, the
2714 error message that was logged was misleading, and incoming SMTP
2715 connections were dropped. The message is now more accurate, and temporary
2716 errors are given to SMTP connections.
2718 22. In some error situations (such as 21 above) Exim rejects all SMTP commands
2719 (except RSET) with a 421 error, until QUIT is received. However, it was
2720 failing to send a response to QUIT.
2722 23. The HELO ACL was being run before the code for helo_try_verify_hosts,
2723 which made it impossible to use "verify = helo" in the HELO ACL. The HELO
2724 ACL is now run after the helo_try_verify_hosts code.
2726 24. "{MD5}" and "{SHA1}" are now recognized as equivalent to "{md5"} and
2727 "{sha1}" in the "crypteq" expansion condition (in fact the comparison is
2728 case-independent, so other case variants are also recognized). Apparently
2729 some systems use these upper case variants.
2731 25. If more than two messages were waiting for the same host, and a transport
2732 filter was specified for the transport, Exim sent two messages over the
2733 same TCP/IP connection, and then failed with "socket operation on non-
2734 socket" when it tried to send the third.
2736 26. Added Exim::debug_write and Exim::log_write for embedded Perl use.
2738 27. The extern definition of crypt16() in expand.c was not being excluded when
2739 the OS had its own crypt16() function.
2741 28. Added bounce_return_body as a new option, and bounce_return_size_limit
2742 as a preferred synonym for return_size_limit, both as an option and as an
2745 29. Added LIBS=-liconv to OS/Makefile-OSF1.
2747 30. Changed the default configuration ACL to relax the local part checking rule
2748 for addresses that are not in any local domains. For these addresses,
2749 slashes and pipe symbols are allowed within local parts, but the sequence
2750 /../ is explicitly forbidden.
2752 31. SPA server authentication was not clearing the challenge buffer before
2755 32. log_message in a "warn" ACL statement was writing to the reject log as
2756 well as to the main log, which contradicts the documentation and doesn't
2757 seem right (because no rejection is happening). So I have stopped it.
2759 33. Added Ard Biesheuvel's lookup code for accessing an Interbase database.
2760 However, I am unable to do any testing of this.
2762 34. Fixed an infelicity in the appendfile transport. When checking directories
2763 for a mailbox, to see if any needed to be created, it was accidentally
2764 using path names with one or more superfluous leading slashes; tracing
2765 would show up entries such as stat("///home/ph10", 0xFFBEEA48).
2767 35. If log_message is set on a "discard" verb in a MAIL or RCPT ACL, its
2768 contents are added to the log line that is written for every discarded
2769 recipient. (Previously a log_message setting was ignored.)
2771 36. The ${quote: operator now quotes the string if it is empty.
2773 37. The install script runs exim in order to find its version number. If for
2774 some reason other than non-existence or emptiness, which it checks, it
2775 could not run './exim', it was installing it with an empty version number,
2776 i.e. as "exim-". This error state is now caught, and the installation is
2779 38. An argument was missing from the function that creates an error message
2780 when Exim fails to connect to the socket for saslauthd authentication.
2781 This could cause Exim to crash, or give a corrupted message.
2783 39. Added isip, isip4, and isip6 to ${if conditions.
2785 40. The ACL variables $acl_xx are now saved with the message, and can be
2786 accessed later in routers, transports, and filters.
2788 41. The new lookup type nwildlsearch is like wildlsearch, except that the key
2789 strings in the file are not string-expanded.
2791 42. If a MAIL command specified a SIZE value that was too large to fit into an
2792 int variable, the check against message_size_limit failed. Such values are
2793 now forced to INT_MAX, which is around 2Gb for a 32-bit variable. Maybe one
2794 day this will have to be increased, but I don't think I want to be around
2795 when emails are that large.
2802 1. Removed HAVE_ICONV=yes from OS/Makefile-FreeBSD, since it seems that
2803 iconv() is not standard in FreeBSD.
2805 2. Change 4.21/17 was buggy and could cause stack overwriting on a system with
2806 IPv6 enabled. The observed symptom was a segmentation fault on return from
2807 the function os_common_find_running_interfaces() in src/os.c.
2809 3. In the check_special_case() function in daemon.c I had used "errno" as an
2810 argument name, which causes warnings on some systems. This was basically a
2811 typo, since it was named "eno" in the comments!
2813 4. The code that waits for the clock to tick (at a resolution of some fraction
2814 of a second) so as to ensure message-id uniqueness was always waiting for
2815 at least one whole tick, when it could have waited for less. [This is
2816 almost certainly not relevant at current processor speeds, where it is
2817 unlikely to ever wait at all. But we try to future-proof.]
2819 5. The function that sleeps for a time interval that includes fractions of a
2820 second contained a race. It did not block SIGALRM between setting the
2821 timer, and suspending (a couple of lines later). If the interval was short
2822 and the sigsuspend() was delayed until after it had expired, the suspension
2823 never ended. On busy systems this could lead to processes getting stuck for
2826 6. Some uncommon configurations may cause a lookup to happen in a queue runner
2827 process, before it forks any delivery processes. The open lookup caching
2828 mechanism meant that the open file or database connection was passed into
2829 the delivery process. The problem was that delivery processes always tidy
2830 up cached lookup data. This could cause a problem for the next delivery
2831 process started by the queue runner, because the external queue runner
2832 process does not know about the closure. So the next delivery process
2833 still has data in the lookup cache. In the case of a file lookup, there was
2834 no problem because closing a file descriptor in a subprocess doesn't affect
2835 the parent. However, if the lookup was caching a connection to a database,
2836 the connection was closed, and the second delivery process was likely to
2837 see errors such as "PGSQL: query failed: server closed the connection
2838 unexpectedly". The problem has been fixed by closing all cached lookups
2839 in a queue runner before running a delivery process.
2841 7. Compiler warning on Linux for the second argument of iconv(), which doesn't
2842 seem to have the "const" qualifier which it has on other OS. I've
2845 8. Change 4.21/2 was too strict. It is only if there are two authenticators
2846 *of the same type* (client or server) with the same public name that an
2847 error should be diagnosed.
2849 9. When Exim looked up a host name for an IP address, but failed to find the
2850 original IP address when looking up the host name (a safety check), it
2851 output the message "<ip address> does not match any IP for NULL", which was
2852 confusing, to say the least. The bug was that the host name should have
2853 appeared instead of "NULL".
2855 10. Since release 3.03, if Exim is called by a uid other than root or the Exim
2856 user that is built into the binary, and the -C or -D options is used, root
2857 privilege is dropped before the configuration file is read. In addition,
2858 logging is switched to stderr instead of the normal log files. If the
2859 configuration then re-defines the Exim user, the unprivileged environment
2860 is probably not what is expected, so Exim logs a panic warning message (but
2863 However, if deliver_drop_privilege is set, the unprivileged state may well
2864 be exactly what is intended, so the warning has been cut out in that case,
2865 and Exim is allowed to try to write to its normal log files.
2871 1. smtp_return_error_details was not giving details for temporary sender
2872 or receiver verification errors.
2874 2. Diagnose a configuration error if two authenticators have the same public
2877 3. Exim used not to create the message log file for a message until the first
2878 delivery attempt. This could be confusing when incoming messages were held
2879 for policy or load reasons. The message log file is now created at the time
2880 the message is received, and an initial "Received" line is written to it.
2882 4. The automatically generated man page for command line options had a minor
2883 bug that caused no ill effects; however, a more serious problem was that
2884 the procedure for building the man page automatically didn't always
2885 operate. Consequently, release 4.20 contains an out-of-date version. This
2886 shouldn't happen again.
2888 5. When building Exim with embedded Perl support, the script that builds the
2889 Makefile was calling 'perl' to find its compile-time parameters, ignoring
2890 any setting of PERL_COMMAND in Local/Makefile. This is now fixed.
2892 6. The freeze_tell option was not being used for messages that were frozen on
2893 arrival, either by an ACL or by local_scan().
2895 7. Added the smtp_incomplete_transaction log selector.
2897 8. After STARTTLS, Exim was not forgetting that it had advertised AUTH, so it
2898 was accepting AUTH without a new EHLO.
2900 9. Added tls_remember_esmtp to cope with YAEB. This allows AUTH and other
2901 ESMTP extensions after STARTTLS without a new EHLO, in contravention of the
2904 10. Logging of TCP/IP connections (when configured) now happens in the main
2905 daemon process instead of the child process, so that the TCP/IP connection
2906 count is more accurate (but it can never be perfect).
2908 11. The use of "drop" in a nested ACL was not being handled correctly in the
2909 outer ACL. Now, if condition failure induced by the nested "drop" causes
2910 the outer ACL verb to deny access ("accept" or "discard" after "endpass",
2911 or "require"), the connection is dropped.
2913 12. Similarly, "discard" in a nested ACL wasn't being handled. A nested ACL
2914 that yield "discard" can now be used with an "accept" or a "discard" verb,
2915 but an error is generated for any others (because I can't see a useful way
2916 to define what should happen).
2918 13. When an ACL is read dynamically from a file (or anywhere else), the lines
2919 are now processed in the same way as lines in the Exim configuration file.
2920 In particular, continuation lines are supported.
2922 14. Added the "dnslists = a.b.c!=n.n.n.n" feature.
2924 15. Added -ti meaning -t -i.
2926 16. Check for letters, digits, hyphens, and dots in the names of dnslist
2927 domains, and warn by logging if others are found.
2929 17. At least on BSD, alignment is not guarenteed for the array of ifreq's
2930 returned from GIFCONF when Exim is trying to find the list of interfaces on
2931 a host. The code in os.c has been modified to copy each ifreq to an aligned
2932 structure in all cases.
2934 Also, in some cases, the returned ifreq's were being copied to a 'struct
2935 ifreq' on the stack, which was subsequently passed to host_ntoa(). That
2936 means the last couple of bytes of an IPv6 address could be chopped if the
2937 ifreq contained only a normal sockaddr (14 bytes storage).
2939 18. Named domain lists were not supported in the hosts_treat_as_local option.
2940 An entry such as +xxxx was not recognized, and was treated as a literal
2943 19. Ensure that header lines added by a DATA ACL are included in the reject log
2944 if the ACL subsequently rejects the message.
2946 20. Upgrade the cramtest.pl utility script to use Digest::MD5 instead of just
2947 MD5 (which is deprecated).
2949 21. When testing a filter file using -bf, Exim was writing a message when it
2950 took the sender from a "From " line in the message, but it was not doing so
2951 when it took $return_path from a Return-Path: header line. It now does.
2953 22. If the contents of a "message" modifier for a "warn" ACL verb do not begin
2954 with a valid header line field name (a series of printing characters
2955 terminated by a colon, Exim now inserts X-ACL-Warn: at the beginning.
2957 23. Changed "disc" in the source to "disk" to conform to the documentation and
2958 the book and for uniformity.
2960 24. Ignore Sendmail's -Ooption=value command line item.
2962 25. When execve() failed while trying to run a command in a pipe transport,
2963 Exim was returning EX_UNAVAILBLE (69) from the subprocess. However, this
2964 could be confused with a return value of 69 from the command itself. This
2965 has been changed to 127, the value the shell returns if it is asked to run
2966 a non-existent command. The wording for the related log line suggests a
2967 non-existent command as the problem.
2969 26. If received_header_text expands to an empty string, do not add a Received:
2970 header line to the message. (Well, it adds a token one on the spool, but
2971 marks it "old" so that it doesn't get used or transmitted.)
2973 27. Installed eximstats 1.28 (addition of -nt option).
2975 28. There was no check for failure on the call to getsockname() in the daemon
2976 code. This can fail if there is a shortage of resources on the system, with
2977 ENOMEM, for example. A temporary error is now given on failure.
2979 29. Contrary to the C standard, it seems that in some environments, the
2980 equivalent of setlocale(LC_ALL, "C") is not obeyed at the start of a C
2981 program. Exim now does this explicitly; it affects the formatting of
2982 timestamps using strftime().
2984 30. If exiqsumm was given junk data, it threw up some uninitialized variable
2985 complaints. I've now initialized all the variables, to avoid this.
2987 32. Header lines added by a system filter were not being "seen" during
2988 transport-time rewrites.
2990 33. The info_callback() function passed to OpenSSL is set up with type void
2991 (*)(SSL *, int, int), as described somewhere. However, when calling the
2992 function (actually a macro) that sets it up, the type void(*)() is
2993 expected. I've put in a cast to prevent warnings from picky compilers.
2995 34. If a DNS black list lookup found a CNAME record, but there were no A
2996 records associated with the domain it pointed at, Exim crashed.
2998 35. If a DNS black list lookup returned more than one A record, Exim ignored
2999 all but the first. It now scans all returned addresses if a particular IP
3000 value is being sought. In this situation, the contents of the
3001 $dnslist_value variable are a list of all the addresses, separated by a
3004 36. Tightened up the rules for host name lookups using reverse DNS. Exim used
3005 to accept a host name and all its aliases if the forward lookup for any of
3006 them yielded the IP address of the incoming connection. Now it accepts only
3007 those names whose forward lookup yields the correct IP address. Any other
3008 names are discarded. This closes a loophole whereby a rogue DNS
3009 administrator could create reverse DNS records to break through a
3010 wildcarded host restriction in an ACL.
3012 37. If a user filter or a system filter that ran in a subprocess used any of
3013 the numerical variables ($1, $2 etc), or $thisaddress, in a pipe command,
3014 the wrong values were passed to the pipe command ($thisaddress had the
3015 value of $0, $0 had the value of $1, etc). This bug was introduced by
3016 change 4.11/101, and not discovered because I wrote an inadequate test. :-(
3018 38. Improved the line breaking for long SMTP error messages from ACLs.
3019 Previously, if there was no break point between 40 and 75 characters, Exim
3020 left the rest of the message alone. Two changes have been made: (a) I've
3021 reduced the minimum length to 35 characters; (b) if it can't find a break
3022 point between 35 and 75 characters, it looks ahead and uses the first one
3023 that it finds. This may give the occasional overlong line, but at least the
3024 remaining text gets split now.
3026 39. Change 82 of 4.11 was unimaginative. It assumed the limit on the number of
3027 file descriptors might be low, and that setting 1000 would always raise it.
3028 It turns out that in some environments, the limit is already over 1000 and
3029 that lowering it causes trouble. So now Exim takes care not to decrease it.
3031 40. When delivering a message, the value of $return_path is set to $sender_
3032 address at the start of routing (routers may change the value). By an
3033 oversight, this default was not being set up when an address was tested by
3034 -bt or -bv, which affected the outcome if any router or filter referred to
3037 41. The idea of the "warn" ACL verb is that it adds a header or writes to the
3038 log only when "message" or "log_message" are set. However, if one of the
3039 conditions was an address verification, or a call to a nested ACL, the
3040 messages generated by the underlying test were being passed through. This
3041 no longer happens. The underlying message is available in $acl_verify_
3042 message for both "message" and "log_message" expansions, so it can be
3043 passed through if needed.
3045 42. Added RFC 2047 interpretation of header lines for $h_ expansions, with a
3046 new expansion $bh_ to give the encoded byte string without charset
3047 translation. Translation happens only if iconv() is available; HAVE_ICONV
3048 indicates this at build time. HEADERS_CHARSET gives the charset to
3049 translate to; headers_charset can change it in the configuration, and
3050 "headers charset" can change it in an individual filter file.
3052 43. Now that we have a default RFC 2047 charset (see above), the code in Exim
3053 that creates RFC 2047 encoded "words" labels them as that charset instead
3054 of always using iso-8859-1. The cases are (i) the explicit ${rfc2047:
3055 expansion operator; (ii) when Exim creates a From: line for a local
3056 message; (iii) when a header line is rewritten to include a "phrase" part.
3058 44. Nasty bug in exiqsumm: the regex to skip already-delivered addresses was
3059 buggy, causing it to skip the first lines of messages whose message ID
3060 ended in 'D'. This would not have bitten before Exim release 4.14, because
3061 message IDs were unlikely to end in 'D' before then. The effect was to have
3062 incorrect size information for certain domains.
3064 45. #include "config.h" was missing at the start of the crypt16.c module. This
3065 caused trouble on Tru64 (aka OSF1) systems, because HAVE_CRYPT16 was not
3068 46. If there was a timeout during a "random" callout check, Exim treated it as
3069 a failure of the random address, and carried on sending RSET and the real
3070 address. If the delay was just some slowness somewhere, the response to the
3071 original RCPT would be taken as a response to RSET and so on, causing
3072 mayhem of various kinds.
3074 47. Change 50 for 4.20 was a heap of junk. I don't know what I was thinking
3075 when I implemented it. It didn't allow for the fact that some option values
3076 may legitimatetly be negative (e.g. size_addition), and it didn't even do
3077 the right test for positive values.
3079 48. Domain names in DNS records are case-independent. Exim always looks them up
3080 in lower case. Some resolvers return domain names in exactly the case they
3081 appear in the zone file, that is, they may contain uppercase letters. Not
3082 all resolvers do this - some return always lower case. Exim was treating a
3083 change of case by a resolver as a change of domain, similar to a widening
3084 of a domain abbreviation. This triggered its re-routing code and so it was
3085 trying to route what was effectively the same domain again. This normally
3086 caused routing to fail (because the router wouldn't handle the domain
3087 twice). Now Exim checks for this case specially, and just changes the
3088 casing of the domain that it ultimately uses when it transmits the message
3091 49. Added Sieve (RFC 3028) support, courtesy of Michael Haardt's contributed
3094 50. If a filter generated a file delivery with a non-absolute name (possible if
3095 no home directory exists for the router), the forbid_file option was not
3098 51. Added '&' feature to dnslists, to provide bit mask matching in addition to
3099 the existing equality matching.
3101 52. Exim was using ints instead of ino_t variables in some places where it was
3102 dealing with inode numbers.
3104 53. If TMPDIR is defined in Local/Makefile (default in src/EDITME is
3105 TMPDIR="/tmp"), Exim checks for the presence of an environment variable
3106 called TMPDIR, and if it finds it is different, it changes its value.
3108 54. The smtp_printf() function is now made available to local_scan() so
3109 additional output lines can be written before returning. There is also an
3110 smtp_fflush() function to enable the detection of a dropped connection.
3111 The variables smtp_input and smtp_batched_input are exported to
3114 55. Changed the default runtime configuration: the message "Unknown user"
3115 has been removed from the ACL, and instead placed on the localuser router,
3116 using the cannot_route_message feature. This means that any verification
3117 failures that generate their own messages won't get overridden. Similarly,
3118 the "Unrouteable address" message that was in the ACL for unverifiable
3119 relay addresses has also been removed.
3121 56. Added hosts_avoid_esmtp to the smtp transport.
3123 57. The exicyclog script was not checking for the esoteric option
3124 CONFIGURE_FILE_USE_EUID in the Local/Makefile. It now does this, but it
3125 will work only if exicyclog is run under the appropriate euid.
3127 58. Following a discussion on the list, the rules by which Exim recognises line
3128 endings on incoming messages have been changed. The -dropcr and drop_cr
3129 options are now no-ops, retained only for backwards compatibility. The
3130 following line terminators are recognized: LF CRLF CR. However, special
3131 processing applies to CR:
3133 (i) The sequence CR . CR does *not* terminate an incoming SMTP message,
3134 nor a local message in the state where . is a terminator.
3136 (ii) If a bare CR is encountered in a header line, an extra space is added
3137 after the line terminator so as not to end the header. The reasoning
3138 behind this is that bare CRs in header lines are most likely either
3139 to be mistakes, or people trying to play silly games.
3141 59. The size of a message, as listed by "-bp" or in the Exim monitor window,
3142 was being incorrectly given as 18 bytes larger than it should have been.
3143 This is a VOB (very old bug).
3145 60. This may never have affected anything current, but just in case it has:
3146 When the local host is found other than at the start of a list of hosts,
3147 the local host, those with the same MX, and any that follow, are discarded.
3148 When the list in question was part of a longer list of hosts, the following
3149 hosts (not currently being processed) were also being discarded. This no
3150 longer happens. I'm not sure if this situation could ever has previously
3153 61. Added the "/MX" feature to lists of hosts in the manualroute and query
3156 62. Whenever Exim generates a new message, it now adds an Auto-Submitted:
3157 header. This is something that is recommended in a new Internet Draft, and
3158 is something that is documented as being done by Sendmail. There are two
3159 possible values. For messages generated by the autoreply transport, Exim
3162 Auto-Submitted: auto-replied
3164 whereas for all other generated messages (e.g. bounces) it adds
3166 Auto-Submitted: auto-generated
3168 63. The "personal" condition in filters now includes a test for the
3169 Auto-Submitted: header. If it contains the string "auto-" the message it
3170 not considered personal.
3172 64. Added rcpt_include_affixes as a generic transport option.
3174 65. Added queue_only_override (default true).
3176 66. Added the syslog_duplication option.
3178 67. If what should have been the first header line of a message consisted of
3179 a space followed by a colon, Exim was mis-interpreting it as a header line.
3180 It isn't of course - it is syntactically invalid and should therefore be
3181 treated as the start of the message body. The misbehaviour could have
3182 caused a number of strange effects, including loss of data in subsequent
3183 header lines, and spool format errors.
3185 68. Formerly, the AUTH parameter on a MAIL command was trusted only if the
3186 client host had authenticated. This control can now be exercised by an ACL
3187 for more flexibility.
3189 69. By default, callouts do not happen when testing with -bh. There is now a
3190 variant, -bhc, which does actually run the callout code, including
3191 consulting and updating the callout cache.
3193 70. Added support for saslauthd authentication, courtesy of Alexander
3196 71. If statvfs() failed on the spool or log directories while checking their
3197 size for availability, Exim confusingly gave the error "space shortage".
3198 Furthermore, in debugging mode it crashed with a floating point exception.
3199 These checks are done if check_{spool,log}_{space,inodes} are set, and when
3200 an SMTP message arrives with SIZE= on the MAIL command. As this is a really
3201 serious problem, Exim now writes to the main and panic logs when this
3202 happens, with details of the failure. It then refuses to accept the
3203 incoming message, giving the message "spool directory problem" or "log
3204 directory problem" with a 421 code for SMTP messages.
3206 72. When Exim is about to re-exec itself, it ensures that the file descriptors
3207 0, 1, and 2 exist, because some OS complain for execs without them (see
3208 ChangeLog 4.05/30). If necessary, Exim opens /dev/null to use for these
3209 descriptors. However, the code omitted to check that the open succeeded,
3210 causing mysterious errors if for some reason the permissions on /dev/null
3211 got screwed. Now Exim writes a message to the main and panic logs, and
3212 bombs out if it can't open /dev/null.
3214 73. Re-vamped the way daemon_smtp_port, local_interfaces, and -oX work and
3215 interact so that it is all more flexible. It is supposed to remain
3216 backwards compatible. Also added extra_local_interfaces.
3218 74. Invalid data sent to a SPA (NTLM) server authenticator could cause the code
3219 to bomb out with an assertion failure - to the client this appears as a
3220 connection drop. This problem occurs in the part of the code that was taken
3221 from the Samba project. Fortunately, the assertion is in a very simple
3222 function, so I have fixed this by reproducing the function inline in the
3223 one place where it is called, and arranging for authentication to fail
3224 instead of killing the process with assert().
3226 75. The SPA client code was not working when the server requested OEM rather
3227 than Unicode encoding.
3229 76. Added code to make require_files with a specific uid setting more usable in
3230 the case where statting the file as root fails - usually a non-root-mounted
3231 NFS file system. When this happens and the failure is EACCES, Exim now
3232 forks a subprocess and does the per-uid checking as the relevant uid.
3234 77. Added process_log_path.
3236 78. If log_file_path was not explicitly set, a setting of check_log_space or
3237 check_log_inodes was ignored.
3239 79. If a space check for the spool or log partitions fails, the incident is now
3240 logged. Of course, in the latter case the data may get lost...
3242 80. Added the %p formatting code to string_format() so that it can be used to
3243 print addresses in debug_print(). Adjusted all the address printing in the
3244 debugging in store.c to use %p rather than %d.
3246 81. There was a concern that a line of code in smtp_in.c could overflow a
3247 buffer if a HELO/EHLO command was given followed by 500 or so spaces. As
3248 initially expressed, the concern was not well-founded, because trailing
3249 spaces are removed early. However, if the trailing spaces were followed by
3250 a NULL, they did not get removed, so the overflow was possible. Two fixes
3253 (a) I re-wrote the offending code in a cleaner fashion.
3254 (b) If an incoming SMTP command contains a NULL character, it is rejected
3257 82. When Exim changes uid/gid to the Exim user at daemon start time, it now
3258 runs initgroups(), so that if the Exim user is in any additional groups,
3259 they will be used during message reception.
3265 The change log for 4.20 and earlier releases has been archived.
git://git.exim.org / users / jgh / exim.git / blob