1 $Cambridge: exim/doc/doc-txt/ChangeLog,v 1.118 2005/04/06 16:26:42 ph10 Exp $
3 Change log file for Exim from version 4.21
4 -------------------------------------------
10 TK/01 Added Yahoo DomainKeys support via libdomainkeys. See
11 doc/experimental-spec.txt for details. (http://domainkeys.sf.net)
13 TK/02 Fix ACL "control" statement not being available in MIME ACL.
15 TK/03 Fix ACL "regex" condition not being available in MIME ACL.
17 PH/01 Installed a patch from the Sieve maintainer that allows -bf to be used
18 to test Sieve filters that use "vacation".
20 PH/02 Installed a slightly modified version of Nikos Mavrogiannopoulos' patch
21 that changes the way the GnuTLS parameters are stored in the cache file.
22 The new format can be generated externally. For backward compatibility,
23 if the data in the cache doesn't make sense, Exim assumes it has read an
24 old-format file, and it generates new data and writes a new file. This
25 means that you can't go back to an older release without removing the
28 PH/03 A redirect router that has both "unseen" and "one_time" set does not
29 work if there are any delivery delays because "one_time" forces the
30 parent to be marked "delivered", so its unseen clone is never tried
31 again. For this reason, Exim now forbids the simultaneous setting of
34 PH/04 Change 4.11/85 fixed an obscure bug concerned with addresses that are
35 redirected to themselves ("homonym" addresses). Read the long ChangeLog
36 entry if you want to know the details. The fix, however, neglected to
37 consider the case when local delivery batching is involved. The test for
38 "previously delivered" was not happening when checking to see if an
39 address could be batched with a previous (undelivered) one; under
40 certain circumstances this could lead to multiple deliveries to the same
43 PH/05 Renamed the macro SOCKLEN_T as EXIM_SOCKLEN_T because AIX uses SOCKLEN_T
44 in its include files, and this causes problems building Exim.
46 PH/06 A number of "verify =" ACL conditions have no options (e.g. verify =
47 header_syntax) but Exim was just ignoring anything given after a slash.
48 In particular, this caused confusion with an attempt to use "verify =
49 reverse_host_lookup/defer_ok". An error is now given when options are
50 supplied for verify items that do not have them. (Maybe reverse_host_
51 lookup should have a defer_ok option, but that's a different point.)
53 PH/07 Increase the size of the buffer for incoming SMTP commands from 512 (as
54 defined by RFC 821) to 2048, because there were problems with some AUTH
55 commands, and RFC 1869 says the size should be increased for extended
56 SMTP commands that take arguments.
58 PH/08 Added ${dlfunc dynamically loaded function for expansion (code from Tony
61 PH/09 Previously, an attempt to use ${perl when it wasn't compiled gave an
62 "unknown" error; now it says that the functionality isn't in the binary.
64 PH/10 Added a nasty fudge to try to recognize and flatten LDAP passwords in
65 an address' error message when a string expansion fails (syntax or
66 whatever). Otherwise not only does the password appear in the log, it may
67 also be put in a bounce message.
69 PH/11 Installed exipick version 20050225.0 from John Jetmore.
71 PH/12 If the last host in a fallback_hosts list was multihomed, only the first
72 of its addresses was ever tried. (Bugzilla bug #2.)
74 PH/13 If "headers_add" in a transport didn't end in a newline, Exim printed
75 the result incorrectly in the debug output. (It correctly added a newline
76 to what was transported.)
78 TF/01 Added $received_time.
80 PH/14 Modified the default configuration to add an acl_smtp_data ACL, with
81 commented out examples of how to interface to a virus scanner and to
82 SpamAssassin. Also added commented examples of av_scanner and
83 spamd_address settings.
85 PH/15 Further to TK/02 and TK/03 above, tidied up the tables of what conditions
86 and controls are allowed in which ACLs. There were a couple of minor
87 errors. Some of the entries in the conditions table (which is a table of
88 where they are NOT allowed) were getting very unwieldy; rewrote them as a
89 negation of where the condition IS allowed.
91 PH/16 Installed updated OS/os.c-cygwin from the Cygwin maintainer.
93 PH/17 The API for radiusclient changed at release 0.4.0. Unfortunately, the
94 header file does not have a version number, so I've had to invent a new
95 value for RADIUS_LIB_TYPE, namely "RADIUSCLIENTNEW" to request the new
96 API. The code is untested by me (my Linux distribution still has 0.3.2 of
97 radiusclient), but it was contributed by a Radius user.
99 PH/18 Installed Lars Mainka's patch for the support of CRL collections in
100 files or directories, for OpenSSL.
102 PH/19 When an Exim process that is running as root has to create an Exim log
103 file, it does so in a subprocess that runs as exim:exim so as to get the
104 ownership right at creation (otherwise, other Exim processes might see
105 the file with the wrong ownership). There was no test for failure of this
106 fork() call, which would lead to the process getting stuck as it waited
107 for a non-existent subprocess. Forks do occasionally fail when resources
108 run out. I reviewed all the other calls to fork(); they all seem to check
111 PH/20 When checking for unexpected SMTP input at connect time (before writing
112 the banner), Exim was not dealing correctly with a non-positive return
113 from the read() function. If the client had disconnected by this time,
114 the result was a log entry for a synchronization error with an empty
115 string after "input=" when read() returned zero. If read() returned -1
116 (an event I could not check), uninitialized data bytes were printed.
117 There were reports of junk text (parts of files, etc) appearing after
120 PH/21 Added acl_not_smtp_mime to allow for MIME scanning for non-SMTP messages.
122 PH/22 Added support for macro redefinition, and (re)definition in between
123 driver and ACL definitions.
125 PH/23 The cyrus_sasl authenticator was expanding server_hostname, but then
126 forgetting to use the resulting value; it was using the unexpanded value.
128 PH/24 The cyrus_sasl authenticator was advertising mechanisms for which it
129 hadn't been configured. The fix is from Juergen Kreileder, who
130 understands it better than I do:
132 "Here's what I see happening with three configured cyrus_sasl
133 authenticators configured (plain, login, cram-md5):
135 On startup auth_cyrus_sasl_init() gets called for each of these.
136 This means three calls to sasl_listmech() without a specified mech_list.
137 => SASL tests which mechs of all available mechs actually work
138 => three warnings about OTP not working
139 => the returned list contains: plain, login, cram-md5, digest-md5, ...
141 With the patch, sasl_listmech() also gets called three times. But now
142 SASL's mech_list option is set to the server_mech specified in the the
143 authenticator. Or in other words, the answer from sasl_listmech()
144 gets limited to just the mech you're testing for (which is different
146 => the return list contains just 'plain' or 'login', 'cram-md5' or
147 nothing depending on the value of ob->server_mech.
149 I've just tested the patch: Authentication still works fine,
150 unavailable mechs specified in the exim configuration are still
151 caught, and the auth.log warnings about OTP are gone."
153 PH/25 When debugging is enabled, the contents of the command line are added
154 to the debugging output, even when log_selector=+arguments is not
157 PH/26 Change scripts/os-type so that when "uname -s" returns just "GNU", the
158 answer is "GNU", and only if the return is "GNU/something" is the answer
161 PH/27 $acl_verify_message is now set immediately after the failure of a
162 verification in an ACL, and so is available in subsequent modifiers. In
163 particular, the message can be preserved by coding like this:
165 warn !verify = sender
166 set acl_m0 = $acl_verify_message
168 Previously, $acl_verify_message was set only while expanding "message"
169 and "log_message" when a very denied access.
171 PH/28 Modified OS/os.c-Linux with
173 -#ifndef OS_LOAD_AVERAGE
174 +#if !defined(OS_LOAD_AVERAGE) && defined(__linux__)
176 to make Exim compile on kfreebsd-gnu. (I'm totally confused about the
177 nomenclature these days.)
179 PH/29 Installed patch from the Sieve maintainer that adds the options
180 sieve_useraddress and sieve_subaddress to the redirect router.
182 PH/30 In these circumstances:
183 . Two addresses routed to the same list of hosts;
184 . First host does not offer TLS;
185 . First host accepts first address;
186 . First host gives temporary error to second address;
187 . Second host offers TLS and a TLS session is established;
188 . Second host accepts second address.
189 Exim incorrectly logged both deliveries with the TLS parameters (cipher
190 and peerdn, if requested) that were in fact used only for the second
193 PH/31 When doing a callout as part of verifying an address, Exim was not paying
194 attention to any local part prefix or suffix that was matched by the
195 router that accepted the address. It now behaves in the same way as it
196 does for delivery: the affixes are removed from the local part unless
197 rcpt_include_affixes is set on the transport.
201 A note about Exim versions 4.44 and 4.50
202 ----------------------------------------
204 Exim 4.50 was meant to be the next release after 4.43. It contains a lot of
205 changes of various kinds. As a consequence, a big documentation update was
206 needed. This delayed the release for rather longer than seemed good, especially
207 in the light of a couple of (minor) security issues. Therefore, the changes
208 that fixed bugs were backported into 4.43, to create a 4.44 maintenance
209 release. So 4.44 and 4.50 are in effect two different branches that both start
212 I have left the 4.50 change log unchanged; it contains all the changes since
213 4.43. The change log for 4.44 is below; many of its items are identical to
214 those for 4.50. This seems to be the most sensible way to preserve the
215 historical information.
221 1. Minor wording change to the doc/README.SIEVE file.
223 2. Change 4.43/35 introduced a bug: if quota_filecount was set, the
224 computation of the current number of files was incorrect.
226 3. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
227 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
230 4. Give more explanation in the error message when the command for a transport
231 filter fails to execute.
233 5. There are several places where Exim runs a non-Exim command in a
234 subprocess. The SIGUSR1 signal should be disabled for these processes. This
235 was being done only for the command run by the queryprogram router. It is
236 now done for all such subprocesses. The other cases are: ${run, transport
237 filters, and the commands run by the lmtp and pipe transports.
239 6. Added CONFIGURE_GROUP build-time option.
241 7. Some older OS have a limit of 256 on the maximum number of file
242 descriptors. Exim was using setrlimit() to set 1000 as a large value
243 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
244 systems. I've change it so that if it can't get 1000, it tries for 256.
246 8. "control=submission" was allowed, but had no effect, in a DATA ACL. This
247 was an oversight, and furthermore, ever since the addition of extra
248 controls (e.g. 4.43/32), the checks on when to allow different forms of
249 "control" were broken. There should now be diagnostics for all cases when a
250 control that does not make sense is encountered.
252 9. Added the /retain_sender option to "control=submission".
254 10. $recipients is now available in the predata ACL (oversight).
256 11. Tidy the search cache before the fork to do a delivery from a message
257 received from the command line. Otherwise the child will trigger a lookup
258 failure and thereby defer the delivery if it tries to use (for example) a
259 cached ldap connection that the parent has called unbind on.
261 12. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
262 of $address_data from the recipient verification was clobbered by the
265 13. The value of address_data from a sender verification is now available in
266 $sender_address_data in subsequent conditions in the ACL statement.
268 14. Added forbid_sieve_filter and forbid_exim_filter to the redirect router.
270 15. Added a new option "connect=<time>" to callout options, to set a different
273 16. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
274 was its contents. (It was OK if the option was not defined at all.)
276 17. A "Completed" log line is now written for messages that are removed from
277 the spool by the -Mrm option.
279 18. New variables $sender_verify_failure and $recipient_verify_failure contain
280 information about exactly what failed.
282 19. Added -dd to debug only the daemon process.
284 20. Incorporated Michael Haardt's patch to ldap.c for improving the way it
285 handles timeouts, both on the server side and network timeouts. Renamed the
286 CONNECT parameter as NETTIMEOUT (but kept the old name for compatibility).
288 21. The rare case of EHLO->STARTTLS->HELO was setting the protocol to "smtp".
289 It is now set to "smtps".
291 22. $host_address is now set to the target address during the checking of
294 23. When checking ignore_target_hosts for an ipliteral router, no host name was
295 being passed; this would have caused $sender_host_name to have been used if
296 matching the list had actually called for a host name (not very likely,
297 since this list is usually IP addresses). A host name is now passed as
300 24. Changed the calls that set up the SIGCHLD handler in the daemon to use the
301 code that specifies a non-restarting handler (typically sigaction() in
302 modern systems) in an attempt to fix a rare and obscure crash bug.
304 25. Narrowed the window for a race in the daemon that could cause it to ignore
305 SIGCHLD signals. This is not a major problem, because they are used only to
306 wake it up if nothing else does.
308 26. A malformed maildirsize file could cause Exim to calculate negative values
309 for the mailbox size or file count. Odd effects could occur as a result.
310 The maildirsize information is now recalculated if the size or filecount
313 27. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
314 support for a long time. Removed HAVE_SYS_VFS_H.
316 28. Installed the latest version of exipick from John Jetmore.
318 29. In an address list, if the pattern was not a regular expression, an empty
319 subject address (from a bounce message) matched only if the pattern was an
320 empty string. Non-empty patterns were not even tested. This was the wrong
321 because it is perfectly reasonable to use an empty address as part of a
322 database query. An empty address is now tested by patterns that are
323 lookups. However, all the other forms of pattern expect the subject to
324 contain a local part and a domain, and therefore, for them, an empty
325 address still always fails if the pattern is not itself empty.
327 30. Exim went into a mad DNS loop when attempting to do a callout where the
328 host was specified on an smtp transport, and looking it up yielded more
331 31. Re-factored the code for checking spool and log partition space into a
332 function that finds that data and another that does the check. The former
333 is then used to implement four new variables: $spool_space, $log_space,
334 $spool_inodes, and $log_inodes.
336 32. The RFC2047 encoding function was originally intended for short strings
337 such as real names; it was not keeping to the 75-character limit for
338 encoded words that the RFC imposes. It now respects the limit, and
339 generates multiple encoded words if necessary. To be on the safe side, I
340 have increased the buffer size for the ${rfc2047: expansion operator from
343 33. It is now permitted to omit both strings after an "if" condition; if the
344 condition is true, the result is "true". As before, when the second string
345 is omitted, a false condition yields an empty string. This makes it less
346 cumbersome to write custom ACL and router conditions.
348 34. Failure to deliver a bounce message always caused it to be frozen, even if
349 there was an errors_to setting on the router. The errors_to setting is now
352 35. If an IPv6 address is given for -bh or -bhc, it is now converted to the
353 canonical form (fully expanded) before being placed in
354 $sender_host_address.
356 36. The table in the code that translates DNS record types into text (T_A to
357 "A" for instance) was missing entries for NS and CNAME. It is just possible
358 that this could have caused confusion if both these types were looked up
359 for the same domain, because the text type is used as part of Exim's
360 per-process caching. But the chance of anyone hitting this buglet seems
363 37. The dnsdb lookup has been extended in a number of ways.
365 (1) There is a new type, "zns", which walks up the domain tree until it
366 finds some nameserver records. It should be used with care.
368 (2) There is a new type, "mxh", which is like "mx" except that it returns
369 just the host names, not the priorities.
371 (3) It is now possible to give a list of domains (or IP addresses) to be
372 looked up. The behaviour when one of the lookups defers can be
373 controlled by a keyword.
375 (4) It is now possible to specify the separator character for use when
376 multiple records are returned.
378 38. The dnslists ACL condition has been extended: it is now possible to supply
379 a list of IP addresses and/or domains to be looked up in a particular DNS
382 39. Added log_selector=+queue_time_overall.
384 40. When running the queue in the test harness, wait just a tad after forking a
385 delivery process, to get repeatability of debugging output.
387 41. Include certificate and key file names in error message when GnuTLS fails
388 to set them up, because the GnuTLS error message doesn't include the name
389 of the failing file when there is a problem reading it.
391 42. Allow both -bf and -bF in the same test run.
393 43. Did the same fix as 41 above for OpenSSL, which had the same infelicity.
395 44. The "Exiscan patch" is now merged into the mainline Exim source.
397 45. Sometimes the final signoff response after QUIT could fail to get
398 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
399 < 0 before doing a fflush(). This bug looks as though it goes back to the
400 introduction of TLS in release 3.20, but "sometimes" must have been rare
401 because the tests only now provoked it.
403 46. Reset the locale to "C" after calling embedded Perl, in case it was changed
404 (this can affect the format of dates).
406 47. exim_tidydb, when checking for the continued existence of a message for
407 which it has found a message-specific retry record, was not finding
408 messages that were in split spool directories. Consequently, it was
409 deleting retry records that should have stayed in existence.
411 48. Steve fixed some bugs in eximstats.
413 49. The SPA authentication driver was not abandoning authentication and moving
414 on to the next authenticator when an expansion was forced to fail,
415 contradicting the general specification for all authenticators. Instead it
416 was generating a temporary error. It now behaves as specified.
418 50. The default ordering of permitted cipher suites for GnuTLS was pessimal
419 (the order specifies the preference for clients). The order is now AES256,
420 AES128, 3DES, ARCFOUR128.
422 51. Small patch to Sieve code - explicitly set From: when generating an
425 52. Exim crashed if a remote delivery caused a very long error message to be
426 recorded - for instance if somebody sent an entire SpamAssassin report back
427 as a large number of 550 error lines. This bug was coincidentally fixed by
428 increasing the size of one of Exim's internal buffers (big_buffer) that
429 happened as part of the Exiscan merge. However, to be on the safe side, I
430 have made the code more robust (and fixed the comments that describe what
433 53. Now that there can be additional text after "Completed" in log lines (if
434 the queue_time_overall log selector is set), a one-byte patch to exigrep
435 was needed to allow it to recognize "Completed" as not the last thing in
438 54. The LDAP lookup was not handling a return of LDAP_RES_SEARCH_REFERENCE. A
439 patch that reportedly fixes this has been added. I am not expert enough to
440 create a test for it. This is what the patch creator wrote:
442 "I found a little strange behaviour of ldap code when working with
443 Windows 2003 AD Domain, where users was placed in more than one
444 Organization Units. When I tried to give exim partial DN, the exit code
445 of ldap_search was unknown to exim because of LDAP_RES_SEARCH_REFERENCE.
446 But simultaneously result of request was absolutely normal ldap result,
447 so I produce this patch..."
449 Later: it seems that not all versions of LDAP support LDAP_RES_SEARCH_
450 REFERENCE, so I have modified the code to exclude the patch when that macro
453 55. Some experimental protocols are using DNS PTR records for new purposes. The
454 keys for these records are domain names, not reversed IP addresses. The
455 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
456 leaves it alone. Component reversal etc. now happens only for IP addresses.
459 56. Improve error message when ldap_search() fails in OpenLDAP or Solaris LDAP.
461 57. Double the size of the debug message buffer (to 2048) so that more of very
462 long debug lines gets shown.
464 58. The exicyclog utility now does better if the number of log files to keep
465 exceeds 99. In this case, it numbers them 001, 002 ... instead of 01, 02...
467 59. Two changes related to the smtp_active_hostname option:
469 (1) $smtp_active_hostname is now available as a variable.
470 (2) The default for smtp_banner uses $smtp_active_hostname instead
471 of $primary_hostname.
473 60. The host_aton() function is supposed to be passed a string that is known
474 to be a valid IP address. However, in the case of IPv6 addresses, it was
475 not checking this. This is a hostage to fortune. Exim now panics and dies
476 if the condition is not met. A case was found where this could be provoked
477 from a dnsdb PTR lookup with an IPv6 address that had more than 8
478 components; fortuitously, this particular loophole had already been fixed
479 by change 4.50/55 above.
481 If there are any other similar loopholes, the new check in host_aton()
482 itself should stop them being exploited. The report I received stated that
483 data on the command line could provoke the exploit when Exim was running as
484 exim, but did not say which command line option was involved. All I could
485 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
489 61. There was a buffer overflow vulnerability in the SPA authentication code
490 (which came originally from the Samba project). I have added a test to the
491 spa_base64_to_bits() function which I hope fixes it.
494 62. Configuration update for GNU/Hurd and variations. Updated Makefile-GNU and
495 os.h-GNU, and added configuration files for GNUkFreeBSD and GNUkNetBSD.
497 63. The daemon start-up calls getloadavg() while still root for those OS that
498 need the first call to be done as root, but it missed one case: when
499 deliver_queue_load_max is set with deliver_drop_privilege. This is
500 necessary for the benefit of the queue runner, because there is no re-exec
501 when deliver_drop_privilege is set.
503 64. A call to exiwhat cut short delays set up by "delay" modifiers in ACLs.
506 65. Caching of lookup data for "hosts =" ACL conditions, when a named host list
507 was in use, was not putting the data itself into the right store pool;
508 consequently, it could be overwritten for a subsequent message in the same
509 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
512 66. Added hosts_max_try_hardlimit to the smtp transport, default 50.
514 67. The string_is_ip_address() function returns 0, 4, or 6, for "no an IP
515 address", "IPv4 address", and "IPv6 address", respectively. Some calls of
516 the function were treating the return as a boolean value, which happened to
517 work because 0=false and not-0=true, but is not correct code.
519 68. The host_aton() function was not handling scoped IPv6 addresses (those
520 with, for example, "%eth0" on the end) correctly.
522 69. Fixed some compiler warnings in acl.c for the bitmaps specified with
523 negated items (that is, ~something) in unsigned ints. Some compilers
524 apparently mutter when there is no cast.
526 70. If an address verification called from an ACL failed, and did not produce a
527 user-specific message (i.e. there was only a "system" message), nothing was
528 put in $acl_verify_message. In this situation, it now puts the system
531 71. Change 4.23/11 added synchronization checking at the start of an SMTP
532 session; change 4.31/43 added the unwanted input to the log line - except
533 that it did not do this in the start of session case. It now does.
535 72. After a timeout in a callout SMTP session, Exim still sent a QUIT command.
536 This is wrong and can cause the other end to generate a synchronization
537 error if it is another Exim or anything else that does the synchronization
538 check. A QUIT command is no longer sent after a timeout.
540 73. $host_lookup_deferred has been added, to make it easier to detect DEFERs
543 74. The defer_ok option of callout verification was not working if it was used
544 when verifying addresses in header lines, that is, for this case:
546 verify = header_sender/callout=defer_ok
548 75. A backgrounded daemon closed stdin/stdout/stderr on entry; this meant that
549 those file descriptors could be used for SMTP connections. If anything
550 wrote to stderr (the example that came up was "warn" in embedded Perl), it
551 could be sent to the SMTP client, causing chaos. The daemon now opens
552 stdin, stdout, and stderr to /dev/null when it puts itself into the
555 76. Arrange for output from Perl's "warn" command to be written to Exim's main
556 log by default. The user can override this with suitable Perl magic.
558 77. The use of log_message on a "discard" ACL verb, which is supposed to add to
559 the log message when discard triggers, was not working for the DATA ACL or
560 for the non-SMTP ACL.
562 78. Error message wording change in sieve.c.
564 79. If smtp_accept_max_per_host was set, the number of connections could be
565 restricted to fewer than expected, because the daemon was trying to set up
566 a new connection before checking whether the processes handling previous
567 connections had finished. The check for completed processes is now done
568 earlier. On busy systems, this bug wouldn't be noticed because something
569 else would have woken the daemon, and it would have reaped the completed
572 80. If a message was submitted locally by a user whose login name contained one
573 or more spaces (ugh!), the spool file that Exim wrote was not re-readable.
574 It caused a spool format error. I have fixed the spool reading code. A
575 related problem was that the "from" clause in the Received: line became
576 illegal because of the space(s). It is now covered by ${quote_local_part.
578 81. Included the latest eximstats from Steve (adds average sizes to HTML Top
581 82. Updated OS/Makefile-AIX as per message from Mike Meredith.
583 83. Patch from Sieve maintainer to fix unterminated string problem in
586 84. Some minor changes to the Linux configuration files to help with other
587 OS variants using glibc.
589 85. One more patch for Sieve to update vacation handling to latest spec.
592 ----------------------------------------------------
593 See the note above about the 4.44 and 4.50 releases.
594 ----------------------------------------------------
600 1. Change 4.43/35 introduced a bug that caused file counts to be
601 incorrectly computed when quota_filecount was set in an appendfile
604 2. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
605 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
608 3. Give more explanation in the error message when the command for a transport
609 filter fails to execute.
611 4. There are several places where Exim runs a non-Exim command in a
612 subprocess. The SIGUSR1 signal should be disabled for these processes. This
613 was being done only for the command run by the queryprogram router. It is
614 now done for all such subprocesses. The other cases are: ${run, transport
615 filters, and the commands run by the lmtp and pipe transports.
617 5. Some older OS have a limit of 256 on the maximum number of file
618 descriptors. Exim was using setrlimit() to set 1000 as a large value
619 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
620 systems. I've change it so that if it can't get 1000, it tries for 256.
622 6. "control=submission" was allowed, but had no effect, in a DATA ACL. This
623 was an oversight, and furthermore, ever since the addition of extra
624 controls (e.g. 4.43/32), the checks on when to allow different forms of
625 "control" were broken. There should now be diagnostics for all cases when a
626 control that does not make sense is encountered.
628 7. $recipients is now available in the predata ACL (oversight).
630 8. Tidy the search cache before the fork to do a delivery from a message
631 received from the command line. Otherwise the child will trigger a lookup
632 failure and thereby defer the delivery if it tries to use (for example) a
633 cached ldap connection that the parent has called unbind on.
635 9. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
636 of $address_data from the recipient verification was clobbered by the
639 10. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
640 was its contents. (It was OK if the option was not defined at all.)
642 11. A "Completed" log line is now written for messages that are removed from
643 the spool by the -Mrm option.
645 12. $host_address is now set to the target address during the checking of
648 13. When checking ignore_target_hosts for an ipliteral router, no host name was
649 being passed; this would have caused $sender_host_name to have been used if
650 matching the list had actually called for a host name (not very likely,
651 since this list is usually IP addresses). A host name is now passed as
654 14. Changed the calls that set up the SIGCHLD handler in the daemon to use the
655 code that specifies a non-restarting handler (typically sigaction() in
656 modern systems) in an attempt to fix a rare and obscure crash bug.
658 15. Narrowed the window for a race in the daemon that could cause it to ignore
659 SIGCHLD signals. This is not a major problem, because they are used only to
660 wake it up if nothing else does.
662 16. A malformed maildirsize file could cause Exim to calculate negative values
663 for the mailbox size or file count. Odd effects could occur as a result.
664 The maildirsize information is now recalculated if the size or filecount
667 17. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
668 support for a long time. Removed HAVE_SYS_VFS_H.
670 18. Updated exipick to current release from John Jetmore.
672 19. Allow an empty sender to be matched against a lookup in an address list.
673 Previously the only cases considered were a regular expression, or an
676 20. Exim went into a mad DNS lookup loop when doing a callout where the
677 host was specified on the transport, if the DNS lookup yielded more than
680 21. The RFC2047 encoding function was originally intended for short strings
681 such as real names; it was not keeping to the 75-character limit for
682 encoded words that the RFC imposes. It now respects the limit, and
683 generates multiple encoded words if necessary. To be on the safe side, I
684 have increased the buffer size for the ${rfc2047: expansion operator from
687 22. Failure to deliver a bounce message always caused it to be frozen, even if
688 there was an errors_to setting on the router. The errors_to setting is now
691 23. If an IPv6 address is given for -bh or -bhc, it is now converted to the
692 canonical form (fully expanded) before being placed in
693 $sender_host_address.
695 24. Updated eximstats to version 1.33
697 25. Include certificate and key file names in error message when GnuTLS fails
698 to set them up, because the GnuTLS error message doesn't include the name
699 of the failing file when there is a problem reading it.
701 26. Expand error message when OpenSSL has problems setting up cert/key files.
704 27. Reset the locale to "C" after calling embedded Perl, in case it was changed
705 (this can affect the format of dates).
707 28. exim_tidydb, when checking for the continued existence of a message for
708 which it has found a message-specific retry record, was not finding
709 messages that were in split spool directories. Consequently, it was
710 deleting retry records that should have stayed in existence.
712 29. eximstats updated to version 1.35
713 1.34 - allow eximstats to parse syslog lines as well as mainlog lines
714 1.35 - bugfix such that pie charts by volume are generated correctly
716 30. The SPA authentication driver was not abandoning authentication and moving
717 on to the next authenticator when an expansion was forced to fail,
718 contradicting the general specification for all authenticators. Instead it
719 was generating a temporary error. It now behaves as specified.
721 31. The default ordering of permitted cipher suites for GnuTLS was pessimal
722 (the order specifies the preference for clients). The order is now AES256,
723 AES128, 3DES, ARCFOUR128.
725 31. Small patch to Sieve code - explicitly set From: when generating an
728 32. Exim crashed if a remote delivery caused a very long error message to be
729 recorded - for instance if somebody sent an entire SpamAssassin report back
730 as a large number of 550 error lines. This bug was coincidentally fixed by
731 increasing the size of one of Exim's internal buffers (big_buffer) that
732 happened as part of the Exiscan merge. However, to be on the safe side, I
733 have made the code more robust (and fixed the comments that describe what
736 33. Some experimental protocols are using DNS PTR records for new purposes. The
737 keys for these records are domain names, not reversed IP addresses. The
738 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
739 leaves it alone. Component reversal etc. now happens only for IP addresses.
742 34. The host_aton() function is supposed to be passed a string that is known
743 to be a valid IP address. However, in the case of IPv6 addresses, it was
744 not checking this. This is a hostage to fortune. Exim now panics and dies
745 if the condition is not met. A case was found where this could be provoked
746 from a dnsdb PTR lookup with an IPv6 address that had more than 8
747 components; fortuitously, this particular loophole had already been fixed
748 by change 4.50/55 or 4.44/33 above.
750 If there are any other similar loopholes, the new check in host_aton()
751 itself should stop them being exploited. The report I received stated that
752 data on the command line could provoke the exploit when Exim was running as
753 exim, but did not say which command line option was involved. All I could
754 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
758 35. There was a buffer overflow vulnerability in the SPA authentication code
759 (which came originally from the Samba project). I have added a test to the
760 spa_base64_to_bits() function which I hope fixes it.
763 36. The daemon start-up calls getloadavg() while still root for those OS that
764 need the first call to be done as root, but it missed one case: when
765 deliver_queue_load_max is set with deliver_drop_privilege. This is
766 necessary for the benefit of the queue runner, because there is no re-exec
767 when deliver_drop_privilege is set.
769 37. Caching of lookup data for "hosts =" ACL conditions, when a named host list
770 was in use, was not putting the data itself into the right store pool;
771 consequently, it could be overwritten for a subsequent message in the same
772 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
775 38. Sometimes the final signoff response after QUIT could fail to get
776 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
777 < 0 before doing a fflush(). This bug looks as though it goes back to the
778 introduction of TLS in release 3.20, but "sometimes" must have been rare
779 because the tests only now provoked it.
785 1. Fixed a longstanding but relatively impotent bug: a long time ago, before
786 PIPELINING, the function smtp_write_command() used to return TRUE or FALSE.
787 Now it returns an integer. A number of calls were still expecting a T/F
788 return. Fortuitously, in all cases, the tests worked in OK situations,
789 which is the norm. However, things would have gone wrong on any write
790 failures on the smtp file descriptor. This function is used when sending
791 messages over SMTP and also when doing verify callouts.
793 2. When Exim is called to do synchronous delivery of a locally submitted
794 message (the -odf or -odi options), it no longer closes stderr before doing
797 3. Implemented the mua_wrapper option.
799 4. Implemented mx_fail_domains and srv_fail_domains for the dnslookup router.
801 5. Implemented the functions header_remove(), header_testname(),
802 header_add_at_position(), and receive_remove_recipient(), and exported them
805 6. If an ACL "warn" statement specified the addition of headers, Exim already
806 inserted X-ACL-Warn: at the start if there was no header name. However, it
807 was not making this test for the second and subsequent header lines if
808 there were newlines in the string. This meant that an invalid header could
809 be inserted if Exim was badly configured.
811 7. Allow an ACL "warn" statement to add header lines at the start or after all
812 the Received: headers, as well as at the end.
814 8. Added the rcpt_4xx retry error code.
816 9. Added postmaster_mailfrom=xxx to callout verification option.
818 10. Added mailfrom=xxxx to the callout verification option, for verify=
821 11. ${substr_1_:xxxx} and ${substr__3:xxxx} are now diagnosed as syntax errors
822 (they previously behaved as ${substr_1_0:xxxx} and ${substr:_0_3:xxxx}).
824 12. Inserted some casts to stop certain compilers warning when using pointer
825 differences as field lengths or precisions in printf-type calls (mostly
826 affecting debugging statements).
828 13. Added optional readline() support for -be (dynamically loaded).
830 14. Obscure bug fix: if a message error (e.g. 4xx to MAIL) happened within the
831 same clock tick as a message's arrival, so that its received time was the
832 same as the "first fail" time on the retry record, and that message
833 remained on the queue past the ultimate address timeout, every queue runner
834 would try a delivery (because it was past the ultimate address timeout) but
835 after another failure, the ultimate address timeout, which should have then
836 bounced the address, did not kick in. This was a "< instead of <=" error;
837 in most cases the first failure would have been in the next clock tick
838 after the received time, and all would be well.
840 15. The special items beginning with @ in domain lists (e.g. @mx_any) were not
841 being recognized when the domain list was tested by the match_domain
842 condition in an expansion string.
844 16. Added the ${str2b64: operator.
846 17. Exim was always calling setrlimit() to set a large limit for the number of
847 processes, without checking whether the existing limit was already
848 adequate. (It did check for the limit on file descriptors.) Furthermore,
849 errors from getrlimit() and setrlimit() were being ignored. Now they are
850 logged to the main and panic logs, but Exim does carry on, to try to do its
851 job under whatever limits there are.
853 18. Imported PCRE 5.0.
855 19. Trivial typo in log message " temporarily refused connection" (the leading
858 20. If the log selector return_path_on_delivery was set and an address was
859 redirected to /dev/null, the delivery process crashed because it assumed
860 that a return path would always be set for a "successful" delivery. In this
861 case, the whole delivery is bypassed as an optimization, and therefore no
864 21. Internal re-arrangement: the function for sending a challenge and reading
865 a response while authentication was assuming a zero-terminated challenge
866 string. It's now changed to take a pointer and a length, to allow for
867 binary data in such strings.
869 22. Added the cyrus_sasl authenticator (code supplied by MBM).
871 23. Exim was not respecting finduser_retries when seeking the login of the
872 uid under which it was called; it was always trying 10 times. (The default
873 setting of finduser_retries is zero.) Also, it was sleeping after the final
874 failure, which is pointless.
876 24. Implemented tls_on_connect_ports.
878 25. Implemented acl_smtp_predata.
880 26. If the domain in control=submission is set empty, Exim assumes that the
881 authenticated id is a complete email address when it generates From: or
882 Sender: header lines.
884 27. Added "#define SOCKLEN_T int" to OS/os.h-SCO and OS/os.h-SCO_SV. Also added
885 definitions to OS/Makefile-SCO and OS/Makefile-SCO_SV that put basename,
886 chown and chgrp in /bin and hostname in /usr/bin.
888 28. Exim was keeping the "process log" file open after each use, just as it
889 does for the main log. This opens the possibility of it remaining open for
890 long periods when the USR1 signal hits a daemon. Occasional processlog
891 errors were reported, that could have been caused by this. Anyway, it seems
892 much more sensible not to leave this file open at all, so that is what now
895 29. The long-running daemon process does not normally write to the log once it
896 has entered its main loop, and it closes the log before doing so. This is
897 so that log files can straightforwardly be renamed and moved. However,
898 there are a couple of unusual error situations where the daemon does write
899 log entries, and I had neglected to close the log afterwards.
901 30. The text of an SMTP error response that was received during a remote
902 delivery was being truncated at 512 bytes. This is too short for some of
903 the long messages that one sometimes sees. I've increased the limit to
906 31. It is now possible to make retry rules that apply only when a message has a
907 specific sender, in particular, an empty sender.
909 32. Added "control = enforce_sync" and "control = no_enforce_sync". This makes
910 it possible to be selective about when SMTP synchronization is enforced.
912 33. Added "control = caseful_local_part" and "control = "caselower_local_part".
914 32. Implemented hosts_connection_nolog.
916 33. Added an ACL for QUIT.
918 34. Setting "delay_warning=" to disable warnings was not working; it gave a
921 35. Added mailbox_size and mailbox_filecount to appendfile.
923 36. Added control = no_multiline_responses to ACLs.
925 37. There was a bug in the logic of the code that waits for the clock to tick
926 in the case where the clock went backwards by a substantial amount such
927 that the microsecond fraction of "now" was more than the microsecond
928 fraction of "then" (but the whole seconds number was less).
930 38. Added support for the libradius Radius client library this is found on
931 FreeBSD (previously only the radiusclient library was supported).
937 1. When certain lookups returned multiple values in the form name=value, the
938 quoting of the values was not always being done properly. Specifically:
939 (a) If the value started with a double quote, but contained no whitespace,
941 (b) If the value contained whitespace other than a space character (i.e.
942 tabs or newlines or carriage returns) it was not quoted.
943 This fix has been applied to the mysql and pgsql lookups by writing a
944 separate quoting function and calling it from the lookup code. The fix
945 should probably also be applied to nisplus, ibase and oracle lookups, but
946 since I cannot test any of those, I have not disturbed their existing code.
948 2. A hit in the callout cache for a specific address caused a log line with no
949 reason for rejecting RCPT. Now it says "Previous (cached) callout
950 verification failure".
952 3. There was an off-by-one bug in the queryprogram router. An over-long
953 return line was truncated at 256 instead of 255 characters, thereby
954 overflowing its buffer with the terminating zero. As well as fixing this, I
955 have increased the buffer size to 1024 (and made a note to document this).
957 4. If an interrupt, such as the USR1 signal that is send by exiwhat, arrives
958 when Exim is waiting for an SMTP response from a remote server, Exim
959 restarts its select() call on the socket, thereby resetting its timeout.
960 This is not a problem when such interrupts are rare. Somebody set up a cron
961 job to run exiwhat every 2 minutes, which is less than the normal select()
962 timeout (5 or 10 minutes). This meant that the select() timeout never
963 kicked in because it was always reset. I have fixed this by comparing the
964 time when an interrupt arrives with the time at the start of the first call
965 to select(). If more time than the timeout has elapsed, the interrupt is
966 treated as a timeout.
968 5. Some internal re-factoring in preparation for the addition of Sieve
969 extensions (by MH). In particular, the "personal" test is moved to a
970 separate function, and given an option for scanning Cc: and Bcc: (which is
971 not set for Exim filters).
973 6. When Exim created an email address using the login of the caller as the
974 local part (e.g. when creating a From: or Sender: header line), it was not
975 quoting the local part when it contained special characters such as @.
977 7. Installed new OpenBSD configuration files.
979 8. Reworded some messages for syntax errors in "and" and "or" conditions to
980 try to make them clearer.
982 9. Callout options, other than the timeout value, were being ignored when
983 verifying sender addresses in header lines. For example, when using
985 verify = header_sender/callout=no_cache
987 the cache was (incorrectly) being used.
989 10. Added a missing instance of ${EXE} to the exim_install script; this affects
990 only the Cygwin environment.
992 11. When return_path_on_delivery was set as a log selector, if different remote
993 addresses in the same message used different return paths and parallel
994 remote delivery occurred, the wrong values would sometimes be logged.
995 (Whenever a remote delivery process finished, the return path value from
996 the most recently started remote delivery process was logged.)
998 12. RFC 3848 specifies standard names for the "with" phrase in Received: header
999 lines when AUTH and/or TLS are in use. This is the "received protocol"
1000 field. Exim used to use "asmtp" for authenticated SMTP, without any
1001 indication (in the protocol name) for TLS use. Now it follows the RFC and
1002 uses "esmtpa" if the connection is authenticated, "esmtps" if it is
1003 encrypted, and "esmtpsa" if it is both encrypted and authenticated. These
1004 names appear in log lines as well as in Received: header lines.
1006 13. Installed MH's patches for Sieve to add the "copy" and "vacation"
1007 extensions, and comparison tests, and to fix some bugs.
1009 14. Changes to the "personal" filter test:
1011 (1) The test was buggy in that it was just doing the equivalent of
1012 "contains" tests on header lines. For example, if a user's address was
1013 anne@some.where, the "personal" test would incorrectly be true for
1015 To: susanne@some.where
1017 This test is now done by extracting each address from the header in turn,
1018 and checking the entire address. Other tests that are part of "personal"
1019 are now done using regular expressions (for example, to check local parts
1020 of addresses in From: header lines).
1022 (2) The list of non-personal local parts in From: addresses has been
1023 extended to include "listserv", "majordomo", "*-request", and "owner-*",
1024 taken from the Sieve specification recommendations.
1026 (3) If the message contains any header line starting with "List-" it is
1027 treated as non-personal.
1029 (4) The test for "circular" in the Subject: header line has been removed
1030 because it now seems ill-conceived.
1032 15. Minor typos in src/EDITME comments corrected.
1034 16. Installed latest exipick from John Jetmore.
1036 17. If headers_add on a router specified a text string that was too long for
1037 string_sprintf() - that is, longer than 8192 bytes - Exim panicked. The use
1038 of string_sprintf() is now avoided.
1040 18. $message_body_size was not set (it was always zero) when running the DATA
1041 ACL and the local_scan() function.
1043 19. For the "mail" command in an Exim filter, no default was being set for
1044 the once_repeat time, causing a random time value to be used if "once" was
1045 specified. (If the value happened to be <= 0, no repeat happened.) The
1046 default is now 0s, meaning "never repeat". The "vacation" command was OK
1047 (its default is 7d). It's somewhat surprising nobody ever noticed this bug
1048 (I found it when inspecting the code).
1050 20. There is now an overall timeout for performing a callout verification. It
1051 defaults to 4 times the callout timeout, which applies to individual SMTP
1052 commands during the callout. The overall timeout applies when there is more
1053 than one host that can be tried. The timeout is checked before trying the
1054 next host. This prevents very long delays if there are a large number of
1055 hosts and all are timing out (e.g. when the network connections are timing
1056 out). The value of the overall timeout can be changed by specifying an
1057 additional sub-option for "callout", called "maxwait". For example:
1059 verify = sender/callout=5s,maxwait=20s
1061 21. Add O_APPEND to the open() call for maildirsize files (Exim already seeks
1062 to the end before writing, but this should make it even safer).
1064 22. Exim was forgetting that it had advertised PIPELINING for the second and
1065 subsequent messages on an SMTP connection. It was also not resetting its
1066 memory on STARTTLS and an internal HELO.
1068 23. When Exim logs an SMTP synchronization error within a session, it now
1069 records whether PIPELINING has been advertised or not.
1071 24. Added 3 instances of "(long int)" casts to time_t variables that were being
1072 formatted using %ld, because on OpenBSD (and perhaps others), time_t is int
1073 rather than long int.
1075 25. Installed the latest Cygwin configuration files from the Cygwin maintainer.
1077 26. Added the never_mail option to autoreply.
1083 1. A reorganization of the code in order to implement 4.40/8 caused a daemon
1084 crash if the getsockname() call failed; this can happen if a connection is
1085 closed very soon after it is established. The problem was simply in the
1086 order in which certain operations were done, causing Exim to try to write
1087 to the SMTP stream before it had set up the file descriptor. The bug has
1088 been fixed by making things happen in the correct order.
1094 1. If "drop" was used in a DATA ACL, the SMTP output buffer was not flushed
1095 before the connection was closed, thus losing the rejection response.
1097 2. Commented out the definition of SOCKLEN_T in os.h-SunOS5. It is needed for
1098 some early Solaris releases, but causes trouble in current releases where
1099 socklen_t is defined.
1101 3. When std{in,out,err} are closed, re-open them to /dev/null so that they
1104 4. Minor refactoring of os.c-Linux to avoid compiler warning when IPv6 is not
1107 5. Refactoring in expand.c to improve memory usage. Pre-allocate a block so
1108 that releasing the top of it at the end releases what was used for sub-
1109 expansions (unless the block got too big). However, discard this block if
1110 the first thing is a variable or header, so that we can use its block when
1111 it is dynamic (useful for very large $message_headers, for example).
1113 6. Lookups now cache *every* query, not just the most recent. A new, separate
1114 store pool is used for this. It can be recovered when all lookup caches are
1115 flushed. Lookups now release memory at the end of their result strings.
1116 This has involved some general refactoring of the lookup sources.
1118 7. Some code has been added to the store_xxx() functions to reduce the amount
1119 of flapping under certain conditions.
1121 8. log_incoming_interface used to affect only the <= reception log lines. Now
1122 it causes the local interface and port to be added to several more SMTP log
1123 lines, for example "SMTP connection from", and rejection lines.
1125 9. The Sieve author supplied some patches for the doc/README.SIEVE file.
1127 10. Added a conditional definition of _BSD_SOCKLEN_T to os.h-Darwin.
1129 11. If $host_data was set by virtue of a hosts lookup in an ACL, its value
1130 could be overwritten at the end of the current message (or the start of a
1131 new message if it was set in a HELO ACL). The value is now preserved for
1132 the duration of the SMTP connection.
1134 12. If a transport had a headers_rewrite setting, and a matching header line
1135 contained an unqualified address, that address was qualified, even if it
1136 did not match any rewriting rules. The underlying bug was that the values
1137 of the flags that permit the existence of unqualified sender and recipient
1138 addresses in header lines (set by {sender,recipient}_unqualified_hosts for
1139 non-local messages, and by -bnq for local messages) were not being
1140 preserved with the message after it was received.
1142 13. When Exim was logging an SMTP synchronization error, it could sometimes log
1143 "next input=" as part of the text comprising the host identity instead of
1144 the correct text. The code was using the same buffer for two different
1145 strings. However, depending on which order the printing function evaluated
1146 its arguments, the bug did not always show up. Under Linux, for example, my
1147 test suite worked just fine.
1149 14. Exigrep contained a use of Perl's "our" scoping after change 4.31/70. This
1150 doesn't work with some older versions of Perl. It has been changed to "my",
1151 which in any case is probably the better facility to use.
1153 15. A really picky compiler found some instances of statements for creating
1154 error messages that either had too many or two few arguments for the format
1157 16. The size of the buffer for calls to the DNS resolver has been increased
1158 from 1024 to 2048. A larger buffer is needed when performing PTR lookups
1159 for addresses that have a lot of PTR records. This alleviates a problem; it
1160 does not fully solve it.
1162 17. A dnsdb lookup for PTR records that receives more data than will fit in the
1163 buffer now truncates the list and logs the incident, which is the same
1164 action as happens when Exim is looking up a host name and its aliases.
1165 Previously in this situation something unpredictable would happen;
1166 sometimes it was "internal error: store_reset failed".
1168 18. If a server dropped the connection unexpectedly when an Exim client was
1169 using GnuTLS and trying to read a response, the client delivery process
1170 crashed while trying to generate an error log message.
1172 19. If a "warn" verb in an ACL added multiple headers to a message in a single
1173 string, for example:
1175 warn message = H1: something\nH2: something
1177 the text was added as a single header line from Exim's point of view
1178 though it ended up OK in the delivered message. However, searching for the
1179 second and subsequent header lines using $h_h2: did not work. This has been
1180 fixed. Similarly, if a system filter added multiple headers in this way,
1181 the routers could not see them.
1183 20. Expanded the error message when iplsearch is called with an invalid key to
1184 suggest using net-iplsearch in a host list.
1186 21. When running tests using -bh, any delays imposed by "delay" modifiers in
1187 ACLs are no longer actually imposed (and a message to that effect is
1190 22. If a "gecos" field in a passwd entry contained escaped characters, in
1191 particular, if it contained a \" sequence, Exim got it wrong when building
1192 a From: or a Sender: header from that name. A second bug also caused
1193 incorrect handling when an unquoted " was present following a character
1194 that needed quoting.
1196 23. "{crypt}" as a password encryption mechanism for a "crypteq" expansion item
1197 was not being matched caselessly.
1199 24. Arranged for all hyphens in the exim.8 source to be escaped with
1202 25. Change 16 of 4.32, which reversed 71 or 4.31 didn't quite do the job
1203 properly. Recipient callout cache records were still being keyed to include
1204 the sender, even when use_sender was set false. This led to far more
1205 callouts that were necessary. The sender is no longer included in the key
1206 when use_sender is false.
1208 26. Added "control = submission" modifier to ACLs.
1210 27. Added the ${base62d: operator to decode base 62 numbers.
1212 28. dnsdb lookups can now access SRV records.
1214 29. CONFIGURE_OWNER can be set at build time to define an alternative owner for
1215 the configuration file.
1217 30. The debug message "delivering xxxxxx-xxxxxx-xx" is now output in verbose
1218 (-v) mode. This makes the output for a verbose queue run more intelligible.
1220 31. Added a use_postmaster feature to recipient callouts.
1222 32. Added the $body_zerocount variable, containing the number of binary zero
1223 bytes in the message body.
1225 33. The time of last modification of the "new" subdirectory is now used as the
1226 "mailbox time last read" when there is a quota error for a maildir
1229 34. Added string comparison operators lt, lti, le, lei, gt, gti, ge, gei.
1231 35. Added +ignore_unknown as a special item in host lists.
1233 36. Code for decoding IPv6 addresses in host lists is now included, even if
1234 IPv6 support is not being compiled. This fixes a bug in which an IPv6
1235 address was recognized as an IP address, but was then not correctly decoded
1236 into binary, causing unexpected and incorrect effects when compared with
1243 1. Very minor rewording of debugging text in manualroute to say "list of
1244 hosts" instead of "hostlist".
1246 2. If verify=header_syntax was set, and a header line with an unqualified
1247 address (no domain) and a large number of spaces between the end of the
1248 name and the colon was received, the reception process suffered a buffer
1249 overflow, and (when I tested it) crashed. This was caused by some obsolete
1250 code that should have been removed. The fix is to remove it!
1252 3. When running in the test harness, delay a bit after writing a bounce
1253 message to get a bit more predictability in the log output.
1255 4. Added a call to search_tidyup() just before forking a reception process. In
1256 theory, someone could use a lookup in the expansion of smtp_accept_max_
1257 per_host which, without the tidyup, could leave open a database connection.
1259 5. Added the variables $recipient_data and $sender_data which get set from a
1260 lookup success in an ACL "recipients" or "senders" condition, or a router
1261 "senders" option, similar to $domain_data and $local_part_data.
1263 6. Moved the writing of debug_print from before to after the "senders" test
1266 7. Change 4.31/66 (moving the time when the Received: is generated) caused
1267 problems for message scanning, either using a data ACL, or using
1268 local_scan() because the Received: header was not generated till after they
1269 were called (in order to set the time as the time of reception completion).
1270 I have revised the way this works. The header is now generated after the
1271 body is received, but before the ACL or local_scan() are called. After they
1272 are run, the timestamp in the header is updated.
1278 1. Change 4.24/6 introduced a bug because the SIGALRM handler was disabled
1279 before starting a queue runner without re-exec. This happened only when
1280 deliver_drop_privilege was set or when the Exim user was set to root. The
1281 effect of the bug was that timeouts during subsequent deliveries caused
1282 crashes instead of being properly handled. The handler is now left at its
1283 default (and expected) setting.
1285 2. The other case in which a daemon avoids a re-exec is to deliver an incoming
1286 message, again when deliver_drop_privilege is set or Exim is run as root.
1287 The bug described in (1) was not present in this case, but the tidying up
1288 of the other signals was missing. I have made the two cases consistent.
1290 3. The ignore_target_hosts setting on a manualroute router was being ignored
1291 for hosts that were looked up using the /MX notation.
1293 4. Added /ignore=<ip list> feature to @mx_any, @mx_primary, and @mx_secondary
1296 5. Change 4.31/55 was buggy, and broke when there was a rewriting rule that
1297 operated on the sender address. After changing the $sender_address to <>
1298 for the sender address verify, Exim was re-instated it as the original
1299 (before rewriting) address, but remembering that it had rewritten it, so it
1300 wasn't rewriting it again. This bug also had the effect of breaking the
1301 sender address verification caching when the sender address was rewritten.
1303 6. The ignore_target_hosts option was being ignored by the ipliteral router.
1304 This has been changed so that if the ip literal address matches
1305 ignore_target_hosts, the router declines.
1307 7. Added expansion conditions match_domain, match_address, and match_local_
1308 part (NOT match_host).
1310 8. The placeholder for the Received: header didn't have a length field set.
1312 9. Added code to Exim itself and to exim_lock to test for a specific race
1313 condition that could lead to file corruption when using MBX delivery. The
1314 issue is with the lockfile that is created in /tmp. If this file is removed
1315 after a process has opened it but before that process has acquired a lock,
1316 there is the potential for a second process to recreate the file and also
1317 acquire a lock. This could lead to two Exim processes writing to the file
1318 at the same time. The added code performs the same test as UW imapd; it
1319 checks after acquiring the lock that its file descriptor still refers to
1320 the same named file.
1322 10. The buffer for building added header lines was of fixed size, 8192 bytes.
1323 It is now parameterized by HEADER_ADD_BUFFER_SIZE and this can be adjusted
1326 11. Added the smtp_active_hostname option. If used, this will typically be made
1327 to depend on the incoming interface address. Because $interface_address is
1328 not set up until the daemon has forked a reception process, error responses
1329 that can happen earlier (such as "too many connections") no longer contain
1332 12. If an expansion in a condition on a "warn" statement fails because a lookup
1333 defers, the "warn" statement is abandoned, and the next ACL statement is
1334 processed. Previously this caused the whole ACL to be aborted.
1336 13. Added the iplsearch lookup type.
1338 14. Added ident_timeout as a log selector.
1340 15. Added tls_certificate_verified as a log selector.
1342 16. Added a global option tls_require_ciphers (compare the smtp transport
1343 option of the same name). This controls incoming TLS connections.
1345 17. I finally figured out how to make tls_require_ciphers do a similar thing
1346 in GNUtls to what it does in OpenSSL, that is, set up an appropriate list
1347 before starting the TLS session.
1349 18. Tabs are now shown as \t in -bP output.
1351 19. If the log selector return_path_on_delivery was set, Exim crashed when
1352 bouncing a message because it had too many Received: header lines.
1354 20. If two routers both had headers_remove settings, and the first one included
1355 a superfluous trailing colon, the final name in the first list and the
1356 first name in the second list were incorrectly joined into one item (with a
1357 colon in the middle).
1363 1. Added -C and -D options to the exinext utility, mainly to make it easier
1364 to include in the automated testing, but these could be helpful when
1365 multiple configurations are in use.
1367 2. The exinext utility was not formatting the output nicely when there was
1368 an alternate port involved in the retry record key, nor when there was a
1369 message id as well (for retries that were specific to a specific message
1370 and a specific host). It was also confused by IPv6 addresses, because of
1371 the additional colons they contain. I have fixed the IPv4 problem, and
1372 patched it up to do a reasonable job for IPv6.
1374 3. When there is an error after a MAIL, RCPT, or DATA SMTP command during
1375 delivery, the log line now contains "pipelined" if PIPELINING was used.
1377 4. An SMTP transport process used to panic and die if the bind() call to set
1378 an explicit outgoing interface failed. This has been changed; it is now
1379 treated in the same way as a connect() failure.
1381 5. A reference to $sender_host_name in the part of a conditional expansion
1382 that was being skipped was still causing a DNS lookup. This no longer
1385 6. The def: expansion condition was not recognizing references to header lines
1386 that used bh_ and bheader_.
1388 7. Added the _cache feature to named lists.
1390 8. The code for checking quota_filecount in the appendfile transport was
1391 allowing one more file than it should have been.
1393 9. For compatibility with Sendmail, the command line option
1401 and sets the incoming protocol and host name (for trusted callers). The
1402 host name and its colon can be omitted when only the protocol is to be set.
1403 Note the Exim already has two private options, -pd and -ps, that refer to
1404 embedded Perl. It is therefore impossible to set a protocol value of "d" or
1405 "s", but I don't think that's a major issue.
1407 10. A number of refactoring changes to the code, none of which should affect
1410 (a) The number of logging options was getting close to filling up the
1411 32-bit word that was used as a bit map. I have split them into two classes:
1412 those that are passed in the argument to log_write(), and those that are
1413 only ever tested independently outside of that function. These are now in
1414 separate 32-bit words, so there is plenty of room for expansion again.
1415 There is no change in the user interface or the logging behaviour.
1417 (b) When building, for example, log lines, the code previously used a
1418 macro that called string_cat() twice, in order to add two strings. This is
1419 not really sufficiently general. Furthermore, there was one instance where
1420 it was actually wrong because one of the argument was used twice, and in
1421 one call a function was used. (As it happened, calling the function twice
1422 did not affect the overall behaviour.) The macro has been replaced by a
1423 function that can join an arbitrary number of extra strings onto a growing
1426 (c) The code for expansion conditions now uses a table and a binary chop
1427 instead of a serial search (which was left over from when there were very
1428 few conditions). Also, it now recognizes conditions like "pam" even when
1429 the relevant support is not compiled in: a suitably worded error message is
1430 given if an attempt is made to use such a condition.
1432 11. Added ${time_interval:xxxxx}.
1434 12. A bug was causing one of the ddress fields not to be passed back correctly
1435 from remote delivery subprocesses. The field in question was not being
1436 subsequently used, so this caused to problems in practice.
1438 13. Added new log selectors queue_time and deliver_time.
1440 14. Might have fixed a bug in maildirsizefile handling that threw up
1441 "unexpected character" debug warnings, and recalculated the data
1442 unnecessarily. In any case, I expanded the warning message to give more
1445 15. Added the message "Restricted characters in address" to the statements in
1446 the default ACL that block characters like @ and % in local parts.
1448 16. Change 71 for release 4.31 proved to be much less benign that I imagined.
1449 Three changes have been made:
1451 (a) There was a serious bug; a negative response to MAIL caused the whole
1452 recipient domain to be cached as invalid, thereby blocking all messages
1453 to all local parts at the same domain, from all senders. This bug has
1454 been fixed. The domain is no longer cached after a negative response to
1455 MAIL if the sender used is not empty.
1457 (b) The default behaviour of using MAIL FROM:<> for recipient callouts has
1460 (c) A new callout option, "use_sender" has been added for people who want
1461 the modified behaviour.
1467 1. Removed "EXTRALIBS=-lwrap" from OS/Makefile-Unixware7 on the advice of
1470 2. Removed "LIBS = -lresolv" from OS/Makefile-Darwin as it is not needed, and
1471 indeed breaks things for older releases.
1473 3. Added additional logging to the case where there is a problem reading data
1474 from a filter that is running in a subprocess using a pipe, in order to
1475 try to track down a specific problem.
1477 4. Testing facility fudge: when running in the test harness and attempting
1478 to connect to 10.x.x.x (expecting a connection timeout) I'm now sometimes
1479 getting "No route to host". Convert this to a timeout.
1481 5. Define ICONV_ARG2_TYPE as "char **" for Unixware7 to avoid compiler
1484 6. Some OS don't have socklen_t but use size_t instead. This affects the
1485 fifth argument of getsockopt() amongst other things. This is now
1486 configurable by a macro called SOCKLEN_T which defaults to socklen_t, but
1487 can be set for individual OS. I have set it for SunOS5, OSF1, and
1488 Unixware7. Current versions of SunOS5 (aka Solaris) do have socklen_t, but
1489 some earlier ones do not.
1491 7. Change 4.30/15 was not doing the test caselessly.
1493 8. The standard form for an IPv6 address literal was being rejected by address
1494 parsing in, for example, MAIL and RCPT commands. An example of this kind of
1495 address is [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
1496 this, as well as the form without the "IPv6" on the front (but only when
1497 address literals are enabled, of course).
1499 9. Added some casts to avoid compiler warnings in OS/os.c-Linux.
1501 10. Exim crashed if a message with an empty sender address specified by -f
1502 encountered a router with an errors_to setting. This could be provoked only
1503 by a command such as
1507 where an empty string was supplied; "<>" did not hit this bug.
1509 11. Installed PCRE release 4.5.
1511 12. If EHLO/HELO was rejected by an ACL, the value of $sender_helo_name
1512 remained set. It is now erased.
1514 13. exiqgrep wasn't working on MacOS X because it didn't correctly compute
1515 times from message ids (which are base 36 rather than the normal 62).
1517 14. "Expected" SMTP protocol errors that can arise when PIPELINING is in use
1518 were being counted as actual protocol errors, and logged if the log
1519 selector +smtp_protocol_error was set. One cannot be perfect in this test,
1520 but now, if PIPELINING has been advertised, RCPT following a rejected MAIL,
1521 and DATA following a set of rejected RCPTs do not count as protocol errors.
1522 In other words, Exim assumes they were pipelined, though this may not
1523 actually be the case. Of course, in all cases the client gets an
1524 appropriate error code.
1526 15. If a lookup fails in an ACL condition, a message about the failure may
1527 be available; it is used if testing the ACL cannot continue, because most
1528 such messages specify what the cause of the deferral is. However, some
1529 messages (e.g. "MYSQL: no data found") do not cause a defer. There was bug
1530 that caused an old message to be retained and used if a later statement
1531 caused a defer, replacing the real cause of the deferral.
1533 16. If an IP address had so many PTR records that the DNS lookup buffer
1534 was not large enough to hold them, Exim could crash while trying to process
1535 the truncated data. It now detects and logs this case.
1537 17. Further to 4.21/58, another change has been made: if (and only if) the
1538 first line of a message (the first header line) ends with CRLF, a bare LF
1539 in a subsequent header line has a space inserted after it, so as not to
1540 terminate the header.
1542 18. Refactoring: tidied an ugly bit of code in appendfile that copied data
1543 unnecessarily, used atoi() instead of strtol(), and didn't check the
1544 termination when getting file sizes from file names by regex.
1546 19. Completely re-implemented the support for maildirsize files, in the light
1547 of a number of problems with the previous contributed implementation
1548 (4.30/29). In particular:
1550 . If the quota is zero, the maildirsize file is maintained, but no quota is
1553 . If the maildir directory does not exist, it is created before any attempt
1554 to write a maildirsize file.
1556 . The quota value in the file is just a cache; if the quota is changed in
1557 the transport, the new value overrides.
1559 . A regular expression is available for excluding directories from the
1562 20. The autoreply transport checks the characters in options that define the
1563 message's headers; it allows continued headers, but it was checking with
1564 isspace() after an embedded newline instead of explicitly looking for a
1567 21. If all the "regular" hosts to which an address was routed had passed their
1568 expiry times, and had not reached their retry times, the address was
1569 bounced, even if fallback hosts were defined. Now Exim should go on to try
1572 22. Increased buffer sizes in the callout code from 1024 to 4096 to match the
1573 equivalent code in the SMTP transport. Some hosts send humungous responses
1574 to HELO/EHLO, more than 1024 it seems.
1576 23. Refactoring: code in filter.c used (void *) for "any old type" but this
1577 gives compiler warnings in some environments. I've now done it "properly",
1580 24. The replacement for inet_ntoa() that is used with gcc on IRIX systems
1581 (because of problems with the built-in one) was declared to return uschar *
1582 instead of char *, causing compiler failure.
1584 25. Fixed a file descriptor leak when processing alias/forward files.
1586 26. Fixed a minor format string issue in dbfn.c.
1588 27. Typo in exim.c: ("dmbnz" for "dbmnz").
1590 28. If a filter file refered to $h_xxx or $message_headers, and the headers
1591 contained RFC 2047 "words", Exim's memory could, under certain conditions,
1594 29. When a sender address is verified, it is cached, to save repeating the test
1595 when there is more than one recipient in a message. However, when the
1596 verification involves a callout, it is possible for different callout
1597 options to be set for different recipients. It is too complicated to keep
1598 track of this in the cache, so now Exim always runs a verification when a
1599 callout is required, relying on the callout cache for the optimization.
1600 The overhead is duplication of the address routing, but this should not be
1603 30. Fixed a bug in callout caching. If a RCPT command caused the sender address
1604 to be verified with callout=postmaster, and the main callout worked but the
1605 postmaster check failed, the verification correctly failed. However, if a
1606 subsequent RCPT command asked for sender verification *without* the
1607 postmaster check, incorrect caching caused this verification also to fail,
1610 31. Exim caches DNS lookup failures so as to avoid multiple timeouts; however,
1611 it was not caching the DNS options (qualify_single, search_parents) that
1612 were used when the lookup failed. A subsequent lookup with different
1613 options therefore always gave the same answer, though there were cases
1614 where it should not have. (Example: a "domains = !$mx_any" option on a
1615 dnslookup router: the "domains" option is always processed without any
1616 widening, but the router might have qualify_single set.) Now Exim uses the
1617 cached value only when the same options are set.
1619 32. Added John Jetmore's "exipick" utility to the distribution.
1621 33. GnuTLS: When an attempt to start a TLS session fails for any reason other
1622 than a timeout (e.g. a certificate is required, and is not provided), an
1623 Exim server now closes the connection immediately. Previously it waited for
1624 the client to close - but if the client is SSL, it seems that they each
1625 wait for each other, leading to a delay before one of them times out.
1627 34: GnuTLS: Updated the code to use the new GnuTLS 1.0.0 API. I have not
1628 maintained 0.8.x compatibility because I don't think many are using it, and
1629 it is clearly obsolete.
1631 35. Added TLS support for CRLs: a tls_crl global option and one for the smtp
1634 36. OpenSSL: $tls_certificate_verified was being set to 1 even if the
1635 client certificate was expired. A simple patch fixes this, though I don't
1636 understand the full logic of why the verify callback is called multiple
1639 37. OpenSSL: a patch from Robert Roselius: "Enable client-bug workaround.
1640 Versions of OpenSSL as of 0.9.6d include a 'CBC countermeasure' feature,
1641 which causes problems with some clients (such as the Certicom SSL Plus
1642 library used by Eudora). This option, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS,
1643 disables the coutermeasure allowing Eudora to connect."
1645 38. Exim was not checking that a write() to a log file succeeded. This could
1646 lead to Bad Things if a log got too big, in particular if it hit a file
1647 size limit. Exim now panics and dies if it cannot write to a log file, just
1648 as it does if it cannot open a log file.
1650 39. Modified OS/Makefile-Linux so that it now contains
1652 CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
1654 The two -D definitions ensure that Exim is compiled with large file
1655 support, which makes it possible to handle log files that are bigger than
1658 40. Fixed a subtle caching bug: if (in an ACL or a set of routers, for
1659 instance) a domain was checked against a named list that involved a lookup,
1660 causing $domain_data to be set, then another domain was checked against the
1661 same list, then the first domain was re-checked, the value of $domain_data
1662 after the final check could be wrong. In particular, if the second check
1663 failed, it could be set empty. This bug probably also applied to
1666 41. The strip_trailing_dot option was not being applied to the address given
1667 with the -f command-line option.
1669 42. The code for reading a message's header from the spool was incrementing
1670 $received_count, but never initializing it. This meant that the value was
1671 incorrect (doubled) while delivering a message in the same process in which
1672 it was received. In the most common configuration of Exim, this never
1673 happens - a fresh exec is done - but it can happen when
1674 deliver_drop_privilege is set.
1676 43. When Exim logs an SMTP synchronization error - client data sent too soon -
1677 it now includes up to 150 characters of the unexpected data in the log
1680 44. The exim_dbmbuild utility uses fixed size buffers for reading input lines
1681 and building data strings. The size of both of these buffers was 10 000
1682 bytes - far larger than anybody would *ever* want, thought I. Needless to
1683 say, somebody hit the limit. I have increased the maximum line length to
1684 20 000 and the maximum data length of concatenated lines to 100 000. I have
1685 also fixed two bugs, because there was no checking on these buffers. Tsk,
1686 tsk. Now exim_dbmbuild gives a message and exits with an error code if a
1687 buffer is too small.
1689 45. The exim_dbmbuild utility did not support quoted keys, as Exim does in
1690 lsearch lookups. Now it does.
1692 46. When parsing a route_list item in a manualroute router, a fixed-length
1693 buffer was used for the list of hosts. I made this 1024 bytes long,
1694 thinking that nobody would ever have a list of hosts that long. Wrong.
1695 Somebody had a whole pile of complicated expansion conditions, and the
1696 string was silently truncated, leading to an expansion error. It turns out
1697 that it is easier to change to an unlimited length (owing to other changes
1698 that have happened since this code was originally written) than to build
1699 structure for giving a limitation error. The length of the item that
1700 expands into the list of hosts is now unlimited.
1702 47. The lsearch lookup could not handle data where the length of text line was
1703 more than 4095 characters. Such lines were truncated, leading to shortened
1704 data being returned. It should now handle lines of any length.
1706 48. Minor wording revision: "cannot test xxx in yyy ACL" becomes "cannot test
1707 xxx condition in yyy ACL" (e.g. "cannot test domains condition in DATA
1710 49. Cosmetic tidy to scripts like exicyclog that are generated by globally
1711 replacing strings such as BIN_DIRECTORY in a source file: the replacement
1712 no longer happens in comment lines. A list of replacements is now placed
1713 at the head of all of the source files, except those whose only change is
1714 to replace PERL_COMMAND in the very first #! line.
1716 50. Replaced the slow insertion sort in queue.c, for sorting the list of
1717 messages on the queue, with a bottom-up merge sort, using code contributed
1718 by Michael Haardt. This should make operations like -bp somewhat faster on
1719 large queues. It won't affect queue runners, except when queue_run_in_order
1722 51. Installed eximstats 1.31 in the distribution.
1724 52. Added support for SRV lookups to the dnslookup router.
1726 53. If an ACL referred to $message_body or $message_body_end, the value was not
1727 reset for any messages that followed in the same SMTP session.
1729 54. The store-handling optimization for building very long strings was not
1730 differentiating between the different store pools. I don't think this
1731 actually made any difference in practice, but I've tidied it.
1733 55. While running the routers to verify a sender address, $sender_address
1734 was still set to the sender address. This is wrong, because when routing to
1735 send a bounce to the sender, it would be empty. Therefore, I have changed
1736 it so that, while verifying a sender address, $sender_address is set to <>.
1737 (There is no change to what happens when verifying a recipient address.)
1739 56. After finding MX (or SRV) records, Exim was doing a DNS lookup for the
1740 target A or AAAA records (if not already returned) without resetting the
1741 qualify_single or search_parents options of the DNS resolver. These are
1742 inappropriate in this case because the targets of MX and SRV records must
1743 be FQDNs. A broken DNS record could cause trouble if it happened to have a
1744 target that, when qualified, matched something in the local domain. These
1745 two options are now turned off when doing these lookups.
1747 57. It seems that at least some releases of Reiserfs (which does not have the
1748 concept of a fixed number of inodes) returns zero and not -1 for the
1749 number of available inodes. This interacted badly with check_spool_inodes,
1750 which assumed that -1 was the "no such thing" setting. What I have done is
1751 to check that the total number of inodes is greater than zero before doing
1752 the test of how many are available.
1754 58. When a "warn" ACL statement has a log_message modifier, the message is
1755 remembered, and not repeated. This is to avoid a lot of repetition when a
1756 message has many recipients that cause the same warning to be written.
1757 Howewer, Exim was preserving the list of already written lines for an
1758 entire SMTP session, which doesn't seem right. The memory is now reset if a
1759 new message is started.
1761 59. The "rewrite" debugging flag was not showing the result of rewriting in the
1762 debugging output unless log_rewrite was also set.
1764 60. Avoid a compiler warning on 64-bit systems in dsearch.c by avoiding the use
1765 of (int)(handle) when we know that handle contains (void *)(-1).
1767 61. The Exim daemon panic-logs an error return when it closes the incoming
1768 connection. However "connection reset by peer" seems to be common, and
1769 isn't really an error worthy of noting specially, so that particular error
1772 62. When Exim is trying to find all the local interfaces, it used to panic and
1773 die if the ioctl to get the interface flags failed. However, it seems that
1774 on at least one OS (Solaris 9) it is possible to have an interface that is
1775 included in the list of interfaces, but for which you get a failure error
1776 for this call. This happens when the interface is not "plumbed" into a
1777 protocol (i.e. neither IPv4 nor IPv6). I've changed the code so that a
1778 failure of the "get flags" call assumes that the interface is down.
1780 63. Added a ${eval10: operator, which assumes all numbers are decimal. This
1781 makes life easier for people who are doing arithmetic on fields extracted
1782 from dates, where you often get leading zeros that should not be
1783 interpreted as octal.
1785 64. Added qualify_domain to the redirect router, to override the global
1788 65. If a pathologically long header line contained very many addresses (the
1789 report of this problem mentioned 10 000) and each of them was rewritten,
1790 Exim could use up a very large amount of memory. (It kept on making new
1791 copies of the header line as it rewrote, and never released the old ones.)
1792 At the expense of a bit more processing, the header rewriting function has
1793 been changed so that it no longer eats memory in this way.
1795 66. The generation of the Received: header has been moved from the time that a
1796 message starts to be received, to the time that it finishes. The timestamp
1797 in the Received: header should now be very close to that of the <= log
1798 line. There are two side-effects of this change:
1800 (a) If a message is rejected by a DATA or non-SMTP ACL or local_scan(), the
1801 logged header lines no longer include the local Received: line, because
1802 it has not yet been created. The same applies to a copy of the message
1803 that is returned to a non-SMTP sender when a message is rejected.
1805 (b) When a filter file is tested using -bf, no additional Received: header
1806 is added to the test message. After some thought, I decided that this
1809 This change does not affect the value of $received_for. It is still set
1810 after address rewriting, but before local_scan() is called.
1812 67. Installed the latest Cygwin-specific files from the Cygwin maintainer.
1814 68. GnuTLS: If an empty file is specified for tls_verify_certificates, GnuTLS
1815 gave an unhelpful panic error message, and a defer error. I have managed to
1816 change this behaviour so that it now rejects any supplied certificate,
1817 which seems right, as the list of acceptable certificates is empty.
1819 69. OpenSSL: If an empty file is specified for tls_verify_certificates, OpenSSL
1820 gave an unhelpful defer error. I have not managed to make this reject any
1821 supplied certificates, but the error message it gives is "no certificate
1822 supplied", which is not helpful.
1824 70. exigrep's output now also includes lines that are not associated with any
1825 message, but which match the given pattern. Implemented by a patch from
1826 Martin Sluka, which also tidied up the Perl a bit.
1828 71. Recipient callout verification, like sender verification, was using <> in
1829 the MAIL FROM command. This isn't really the right thing, since the actual
1830 sender may affect whether the remote host accepts the recipient or not. I
1831 have changed it to use the actual sender in the callout; this means that
1832 the cache record is now keyed on a recipient/sender pair, not just the
1833 recipient address. There doesn't seem to be a real danger of callout loops,
1834 since a callout by the remote host to check the sender would use <>.
1835 [SEE ABOVE: changed after hitting problems.]
1837 72. Exim treats illegal SMTP error codes that do not begin with 4 or 5 as
1838 temporary errors. However, in the case of such a code being given after
1839 the end of a data transmission (i.e. after ".") Exim was failing to write
1840 a retry record for the message. (Yes, there was some broken host that was
1841 actually sending 8xx at this point.)
1843 73. An unknown lookup type in a host list could cause Exim to panic-die when
1844 the list was checked. (An example that provoked this was putting <; in the
1845 middle of a list instead of at the start.) If this happened during a DATA
1846 ACL check, a -D file could be left lying around. This kind of configuration
1847 error no longer causes Exim to die; instead it causes a defer errror. The
1848 incident is still logged to the main and panic logs.
1850 74. Buglet left over from Exim 3 conversion. The message "too many messages
1851 in one connection" was written to the rejectlog but not the mainlog, except
1852 when address rewriting (yes!) was being logged.
1854 75. Added write_rejectlog option.
1856 76. When a system filter was run not as root (that is, when system_filter_user
1857 was set), the values of the $n variables were not being returned to the
1858 main process; thus, they were not subsequently available in the $sn
1861 77. Added +return_path_on_delivery log selector.
1863 78. A connection timeout was being treated differently from recipients deferred
1864 when testing hosts_max_try with a message that was older than the host's
1865 retry timeout. (The host should not be counted, thus allowing all hosts to
1866 be tried at least once before bouncing.) This may have been the cause of an
1867 occasionally reported bug whereby a message would remain on the queue
1868 longer than the retry timeout, but would be bounced if a delivery was
1869 forced. I say "may" because I never totally pinned down the problem;
1870 setting up timeout/retry tests is difficult. See also the next item.
1872 79. The ultimate address timeout was not being applied to errors that involved
1873 a combination of host plus message (for example, a timeout on a MAIL
1874 command). When an address resolved to a number of possible hosts, and they
1875 were not all tried for each delivery (e.g. because of hosts_max_try), a
1876 message could remain on the queue longer than the retry timeout.
1878 80. Sieve bug: "stop" inside "elsif" was broken. Applied a patch from Michael
1881 81. Fixed an obscure SMTP outgoing bug which required at least the following
1882 conditions: (a) there was another message waiting for the same server;
1883 (b) the server returned 5xx to all RCPT commands in the first message so
1884 that the message was not completed; (c) the server dropped the connection
1885 or gave a negative response to the RSET that Exim sends to abort the
1886 transaction. The observed case was a dropped connection after DATA that had
1887 been sent in pipelining mode. That is, the server had advertised PIPELINING
1888 but was not implementing it correctly. The effect of the bug was incorrect
1889 behaviour, such as trying another host, and this could lead to a crash.
1895 1. The 3rd arguments to getsockname(), getpeername(), and accept() in exim.c
1896 and daemon.c were passed as pointers to ints; they should have been
1897 pointers to socklen_t variables (which are typically unsigned ints).
1899 2. Some signed/unsigned type warnings in the os.c file for Linux have been
1902 3. Fixed a really odd bug that affected only the testing scheme; patching a
1903 certain fixed string in the binary changed the value of another string that
1904 happened to be identical to the end of the original first string.
1906 4. When gethostbyname() (or equivalent) is passed an IP address as a "host
1907 name", it returns that address as the IP address. On some operating
1908 systems (e.g. Solaris), it also passes back the IP address string as the
1909 "host name". However, on others (e.g. Linux), it passes back an empty
1910 string. Exim wasn't checking for this, and was changing the host name to an
1911 empty string, assuming it had been canonicized.
1913 5. Although rare, it is permitted to have more than one PTR record for a given
1914 IP address. I thought that gethostbyaddr() or getipnodebyaddr() always gave
1915 all the names associated with an address, because they do in Solaris.
1916 However, it seems that they do not in Linux for data that comes from the
1917 DNS. If an address in /etc/hosts has multiple names, they _are_ all given.
1918 I found this out when I moved to a new Linux workstation and tried to run
1919 the Exim test suite.
1921 To get round this problem I have changed the code so that it now does its
1922 own call to the DNS to look up PTR records when searching for a host name.
1923 If nothing can be found in the DNS, it tries gethostbyaddr(), so that
1924 addresses that are only in /etc/hosts are still found.
1926 This behaviour is, however, controlled by an option called host_lookup_
1927 order, which defaults to "bydns:byaddr". If people want to use the other
1928 order, or indeed, just use one or the other means of lookup, they can
1929 specify it in this variable.
1931 6. If a PTR record yields an empty name, Exim treats it as non-existent. In
1932 some operating systems, this comes back from gethostbyaddr() as an empty
1933 string, and this is what Exim used to test for. However, it seems that in
1934 other systems, "." is yielded. Exim now tests for this case too.
1936 7. The values of check_spool_space and check_log_space are now held internally
1937 as a number of kilobytes instead of an absolute number of bytes. If a
1938 numbers is specified without 'K' or 'M', it is rounded up to the nearest
1939 kilobyte. This means that much larger values can be stored.
1941 8. Exim monitor: an attempt to get the action menu when not actually pointing
1942 at a message produces an empty menu entitled "No message selected". This
1943 works on Solaris (OpenWindows). However, XFree86 does not like a menu with
1944 no entries in it ("Shell widget menu has zero width and/or height"). So I
1945 have added a single, blank menu entry in this case.
1947 9. Added ${quote_local_part.
1949 10. MIME decoding is now applied to the contents of Subject: header lines when
1952 11. Now that a reference to $sender_host_address automatically causes a reverse
1953 lookup to occur if necessary (4.13/18), there is no need to arrange for a
1954 host lookup before query-style lookups in lists that might use this
1955 variable. This has therefore been abolished, and the "net-" prefix is no
1956 longer necessary for query-style lookups.
1958 12. The Makefile for SCO_SV contained a setting of LDFLAGS. This appears to
1959 have been a typo for LFLAGS, so it has been changed.
1961 13. The install script calls Exim with "-C /dev/null" in order to find the
1962 version number. If ALT_CONFIG_PREFIX was set, this caused an error message
1963 to be output. Howeve, since Exim outputs its version number before the
1964 error, it didn't break the script. It just looked ugly. I fixed this by
1965 always allowing "-C /dev/null" if the caller is root.
1967 14. Ignore overlarge ACL variable number when reading spool file - insurance
1968 against a later release with more variables having written the file.
1970 15. The standard form for an IPv6 address literal was being rejected by EHLO.
1971 Example: [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
1972 this, as well as the form without the "IPv6" on the front.
1974 16. Added CHOWN_COMMAND=/usr/sbin/chown and LIBS=-lresolv to the
1975 OS/Makefile-Darwin file.
1977 17. Fixed typo in lookups/ldap.c: D_LOOKUP should be D_lookup. This applied
1978 only to LDAP libraries that do not have LDAP_OPT_DEREF.
1980 18. After change 4.21/52, "%ld" was used to format the contents of the $inode
1981 variable. However, some OS use ints for inodes. I've added cast to long int
1982 to get rid of the compiler warning.
1984 19. I had forgotten to lock out "/../" in configuration file names when
1985 ALT_CONFIG_PREFIX was set.
1987 20. Routers used for verification do not need to specify transports. However,
1988 if such a router generated a host list, and callout was configured, Exim
1989 crashed, because it could not find a port number from the (non-existent)
1990 transport. It now assumes port 25 in this circumstance.
1992 21. Added the -t option to exigrep.
1994 22. If LOOKUP_LSEARCH is defined, all three linear search methods (lsearch,
1995 wildlsearch, nwildlsearch) are compiled. LOOKUP_WILDLSEARCH and LOOKUP_
1996 NWILDLSEARCH are now obsolete, but retained for compatibility. If either of
1997 them is set, LOOKUP_LSEARCH is forced.
1999 23. "exim -bV" now outputs a list of lookups that are included in the binary.
2001 24. Added sender and host information to the "rejected by local_scan()" log
2002 line; previously there was no indication of these.
2004 25. Added .include_if_exists.
2006 26. Change 3.952/11 added an explicit directory sync on top of a file sync for
2007 Linux. It turns out that not all file systems support this. Apparently some
2008 versions of NFS do not. (It's rare to put Exim's spool on NFS, but people
2009 do it.) To cope with this, the error EINVAL, which means that sync-ing is
2010 not supported on the file descriptor, is now ignored when Exim is trying to
2011 sync a directory. This applies only to Linux.
2013 27. Added -DBIND_8_COMPAT to the CLFAGS setting for Darwin.
2015 28. In Darwin (MacOS X), the PAM headers are in /usr/include/pam and not in
2016 /usr/include/security. There's now a flag in OS/os.h-Darwin to cope with
2019 29. Added support for maildirsize files from supplied patch (modified a bit).
2021 30. The use of :fail: followed by an empty string could lead Exim to respond to
2022 sender verification failures with (e.g.):
2024 550 Verification failed for <xxx>
2025 550 Sender verify failed
2027 where the first response line was missing the '-' that indicates it is not
2028 the final line of the response.
2030 31. The loop for finding the name of the user that called Exim had a hardwired
2031 limit of 10; it now uses the value of finduser_retries, which is used for
2032 all other user lookups.
2034 32. Added $received_count variable, available in data and not_smtp ACLs, and at
2037 33. Exim was neglecting to zero errno before one call of strtol() when
2038 expanding a string and expecting an integer value. On some systems this
2039 resulted in spurious "integer overflow" errors. Also, it was casting the
2040 result into an int without checking.
2042 34. Testing for a connection timeout using "timeout_connect" in the retry rules
2043 did not work. The code looks as if it has *never* worked, though it appears
2044 to have been documented since at least releast 1.62. I have made it work.
2046 35. The "timeout_DNS" error in retry rules, also documented since at least
2047 1.62, also never worked. As it isn't clear exactly what this means, and
2048 clearly it isn't a major issue, I have abolished the feature by treating it
2049 as "timeout", and writing a warning to the main and panic logs.
2051 36. The display of retry rules for -brt wasn't always showing the error code
2054 37. Added new error conditions to retry rules: timeout_A, timeout_MX,
2055 timeout_connect_A, timeout_connect_MX.
2057 38. Rewriting the envelope sender at SMTP time did not allow it to be rewritten
2058 to the empty sender.
2060 39. The daemon was not analysing the content of -oX till after it had closed
2061 stderr and disconnected from the controlling terminal. This meant that any
2062 syntax errors were only noted on the panic log, and the return code from
2063 the command was 0. By re-arranging the code a little, I've made the
2064 decoding happen first, so such errors now appear on stderr, and the return
2065 code is 1. However, the actual setting up of the sockets still happens in
2066 the disconnected process, so errors there are still only recorded on the
2069 40. A daemon listener on a wildcard IPv6 socket that also accepts IPv4
2070 connections (as happens on some IP stacks) was logged at start up time as
2071 just listening for IPv6. It now logs "IPv6 with IPv4". This differentiates
2072 it from "IPv6 and IPv4", which means that two separate sockets are being
2075 41. The debug output for gethostbyname2() or getipnodebyname() failures now
2076 says whether AF_INET or AF_INET6 was passed as an argument.
2078 42. Exiwhat output was messed up when time zones were included in log
2081 43. Exiwhat now gives more information about the daemon's listening ports,
2082 and whether -tls-on-connect was used.
2084 44. The "port" option of the smtp transport is now expanded.
2086 45. A "message" modifier in a "warn" statement in a non-message ACL was being
2087 silently ignored. Now an error message is written to the main and panic
2090 46. There's a new ACL modifier called "logwrite" which writes to a log file
2091 as soon as it is encountered.
2093 47. Added $local_user_uid and $local_user_gid at routing time.
2095 48. Exim crashed when trying to verify a sender address that was being
2098 49. Exim was recognizing only a space character after ".include". It now also
2099 recognizes a tab character.
2101 50. Fixed several bugs in the Perl script that creates the exim.8 man page by
2102 extracting the relevant information from the specification. The man page no
2103 longer contains scrambled data for the -d option, and I've added a section
2104 at the front about calling Exim under different names.
2106 51. Added "extra_headers" argument to the "mail" command in filter files.
2108 52. Redirecting mail to an unqualified address in a Sieve filter caused Exim to
2111 53. Installed eximstats 1.29.
2113 54. Added transport_filter_timeout as a generic transport option.
2115 55. Exim no longer adds an empty Bcc: header to messages that have no To: or
2116 Cc: header lines. This was required by RFC 822, but it not required by RFC
2119 56. Exim used to add From:, Date:, and Message-Id: header lines to any
2120 incoming messages that did not have them. Now it does so only if the
2121 message originates locally, that is, if there is no associated remote host
2122 address. When Resent- header lines are present, this applies to the Resent-
2123 lines rather than the non-Resent- lines.
2125 57. Drop incoming SMTP connection after too many syntax or protocol errors. The
2126 limit is controlled by smtp_max_synprot_errors, defaulting to 3.
2128 58. Messages for configuration errors now include the name of the main
2129 configuration file - useful now that there may be more than one file in a
2130 list (.included file names were always shown).
2132 59. Change 4.21/82 (run initgroups() when starting the daemon) causes problems
2133 for those rare installations that do not start the daemon as root or run it
2134 setuid root. I've cut out the call to initgroups() if the daemon is not
2137 60. The Exim user and group can now be bound into the binary as text strings
2138 that are looked up at the start of Exim's processing.
2140 61. Applied a small patch for the Interbase code, supplied by Ard Biesheuvel.
2142 62. Added $mailstore_basename variable.
2144 63. Installed patch to sieve.c from Michael Haardt.
2146 64. When Exim failed to open the panic log after failing to open the main log,
2147 the original message it was trying to log was written to stderr and debug
2148 output, but if they were not available (the usual case in production), it
2149 was lost. Now it is written to syslog before the two lines that record the
2150 failures to open the logs.
2152 65. Users' Exim filters run in subprocesses under the user's uid. It is
2153 possible for a "deliver" command or an alias in a "personal" command to
2154 provoke an address rewrite. If logging of address rewriting is configured,
2155 this fails because the process is not running as root or exim. There may be
2156 a better way of dealing with this, but for the moment (because 4.30 needs
2157 to be released), I have disabled address rewrite logging when running a
2158 filter in a non-root, non-exim process.
2164 1. The buildconfig auxiliary program wasn't quoting the value set for
2165 HEADERS_CHARSET. This caused a compilation error complaining that 'ISO' was
2166 not defined. This bug was masked in 4.22 by the effect that was fixed in
2169 2. Some messages that were rejected after a message id was allocated were
2170 shown as "incomplete" by exigrep. It no longer does this for messages that
2171 are rejected by local_scan() or the DATA or non-SMTP ACLs.
2173 3. If a Message-ID: header used a domain literal in the ID, and Exim did not
2174 have allow_domain_literals set, the ID did not get logged in the <= line.
2175 Domain literals are now always recognized in Message-ID: header lines.
2177 4. The first argument for a ${extract expansion item is the key name or field
2178 number. Leading and trailing spaces in this item were not being ignored,
2179 causing some misleading effects.
2181 5. When deliver_drop_privilege was set, single queue runner processes started
2182 manually (i.e. by the command "exim -q") or by the daemon (which uses the
2183 same command in the process it spins off) were not dropping privilege.
2185 6. When the daemon running as "exim" started a queue runner, it always
2186 re-executed Exim in the spun-off process. This is a waste of effort when
2187 deliver_drop_privilege is set. The new process now just calls the
2188 queue-runner function directly.
2194 1. Typo in the src/EDITME file: it referred to HEADERS_DECODE_TO instead of
2197 2. Change 4.21/73 introduced a bug. The pid file path set by -oP was being
2198 ignored. Though the use of -oP was forcing the writing of a pid file, it
2199 was always written to the default place.
2201 3. If the message "no IP address found for host xxxx" is generated during
2202 incoming verification, it is now followed by identification of the incoming
2203 connection (so you can more easily find what provoked it).
2205 4. Bug fix for Sieve filters: "stop" inside a block was not working properly.
2207 5. Added some features to "harden" Exim a bit more against certain attacks:
2209 (a) There is now a build-time option called FIXED_NEVER_USERS that can
2210 be put in Local/Makefile. This is like the never_users runtime option,
2211 but it cannot be overridden. The default setting is "root".
2213 (b) If ALT_CONFIG_PREFIX is defined in Local/Makefile, it specifies a
2214 prefix string with which any file named in a -C command line option
2217 (c) If ALT_CONFIG_ROOT_ONLY is defined in Local/Makefile, root privilege
2218 is retained for -C and -D only if the caller of Exim is root. Without
2219 it, the exim user may also use -C and -D and retain privilege.
2221 (d) If DISABLE_D_OPTION is defined in Local/Makefile, the use of the -D
2222 command line option is disabled.
2224 6. Macro names set by the -D option must start with an upper case letter, just
2225 like macro names defined in the configuration file.
2227 7. Added "dereference=" facility to LDAP.
2229 8. Two instances of the typo "uknown" in the source files are fixed.
2231 9. If a PERL_COMMAND setting in Local/Makefile was not at the start of a line,
2232 the Configure-Makefile script screwed up while processing it.
2234 10. Incorporated PCRE 4.4.
2236 11. The SMTP synchronization check was not operating right at the start of an
2237 SMTP session. For example, it could not catch a HELO sent before the client
2238 waited for the greeting. There is now a check for outstanding input at the
2239 point when the greeting is written. Because of the duplex, asynchronous
2240 nature of TCP/IP, it cannot be perfect - the incorrect input may be on its
2241 way, but not yet received, when the check is performed.
2243 12. Added tcp_nodelay to make it possible to turn of the setting of TCP_NODELAY
2244 on TCP/IP sockets, because this apparently causes some broken clients to
2247 13. Installed revised OS/Makefile-CYGWIN and OS/os.c-cygwin (the .h file was
2248 unchanged) from the Cygwin maintainer.
2250 14. The code for -bV that shows what is in the binary showed "mbx" when maildir
2251 was supported instead of testing for mbx. Effectively a typo.
2253 15. The spa authenticator server code was not checking that the input it
2254 received was valid base64.
2256 16. The debug output line for the "set" modifier in ACLs was not showing the
2257 name of the variable that was being set.
2259 17. Code tidy: the variable type "vtype_string" was never used. Removed it.
2261 18. Previously, a reference to $sender_host_name did not cause a DNS reverse
2262 lookup on its own. Something else was needed to trigger the lookup. For
2263 example, a match in host_lookup or the need for a host name in a host list.
2264 Now, if $sender_host_name is referenced and the host name has not yet been
2265 looked up, a lookup is performed. If the lookup fails, the variable remains
2266 empty, and $host_lookup_failed is set to "1".
2268 19. Added "eqi" as a case-independent comparison operator.
2270 20. The saslauthd authentication condition could segfault if neither service
2271 nor realm was specified.
2273 21. If an overflowing value such as "2048M" was set for message_size_limit, the
2274 error message that was logged was misleading, and incoming SMTP
2275 connections were dropped. The message is now more accurate, and temporary
2276 errors are given to SMTP connections.
2278 22. In some error situations (such as 21 above) Exim rejects all SMTP commands
2279 (except RSET) with a 421 error, until QUIT is received. However, it was
2280 failing to send a response to QUIT.
2282 23. The HELO ACL was being run before the code for helo_try_verify_hosts,
2283 which made it impossible to use "verify = helo" in the HELO ACL. The HELO
2284 ACL is now run after the helo_try_verify_hosts code.
2286 24. "{MD5}" and "{SHA1}" are now recognized as equivalent to "{md5"} and
2287 "{sha1}" in the "crypteq" expansion condition (in fact the comparison is
2288 case-independent, so other case variants are also recognized). Apparently
2289 some systems use these upper case variants.
2291 25. If more than two messages were waiting for the same host, and a transport
2292 filter was specified for the transport, Exim sent two messages over the
2293 same TCP/IP connection, and then failed with "socket operation on non-
2294 socket" when it tried to send the third.
2296 26. Added Exim::debug_write and Exim::log_write for embedded Perl use.
2298 27. The extern definition of crypt16() in expand.c was not being excluded when
2299 the OS had its own crypt16() function.
2301 28. Added bounce_return_body as a new option, and bounce_return_size_limit
2302 as a preferred synonym for return_size_limit, both as an option and as an
2305 29. Added LIBS=-liconv to OS/Makefile-OSF1.
2307 30. Changed the default configuration ACL to relax the local part checking rule
2308 for addresses that are not in any local domains. For these addresses,
2309 slashes and pipe symbols are allowed within local parts, but the sequence
2310 /../ is explicitly forbidden.
2312 31. SPA server authentication was not clearing the challenge buffer before
2315 32. log_message in a "warn" ACL statement was writing to the reject log as
2316 well as to the main log, which contradicts the documentation and doesn't
2317 seem right (because no rejection is happening). So I have stopped it.
2319 33. Added Ard Biesheuvel's lookup code for accessing an Interbase database.
2320 However, I am unable to do any testing of this.
2322 34. Fixed an infelicity in the appendfile transport. When checking directories
2323 for a mailbox, to see if any needed to be created, it was accidentally
2324 using path names with one or more superfluous leading slashes; tracing
2325 would show up entries such as stat("///home/ph10", 0xFFBEEA48).
2327 35. If log_message is set on a "discard" verb in a MAIL or RCPT ACL, its
2328 contents are added to the log line that is written for every discarded
2329 recipient. (Previously a log_message setting was ignored.)
2331 36. The ${quote: operator now quotes the string if it is empty.
2333 37. The install script runs exim in order to find its version number. If for
2334 some reason other than non-existence or emptiness, which it checks, it
2335 could not run './exim', it was installing it with an empty version number,
2336 i.e. as "exim-". This error state is now caught, and the installation is
2339 38. An argument was missing from the function that creates an error message
2340 when Exim fails to connect to the socket for saslauthd authentication.
2341 This could cause Exim to crash, or give a corrupted message.
2343 39. Added isip, isip4, and isip6 to ${if conditions.
2345 40. The ACL variables $acl_xx are now saved with the message, and can be
2346 accessed later in routers, transports, and filters.
2348 41. The new lookup type nwildlsearch is like wildlsearch, except that the key
2349 strings in the file are not string-expanded.
2351 42. If a MAIL command specified a SIZE value that was too large to fit into an
2352 int variable, the check against message_size_limit failed. Such values are
2353 now forced to INT_MAX, which is around 2Gb for a 32-bit variable. Maybe one
2354 day this will have to be increased, but I don't think I want to be around
2355 when emails are that large.
2362 1. Removed HAVE_ICONV=yes from OS/Makefile-FreeBSD, since it seems that
2363 iconv() is not standard in FreeBSD.
2365 2. Change 4.21/17 was buggy and could cause stack overwriting on a system with
2366 IPv6 enabled. The observed symptom was a segmentation fault on return from
2367 the function os_common_find_running_interfaces() in src/os.c.
2369 3. In the check_special_case() function in daemon.c I had used "errno" as an
2370 argument name, which causes warnings on some systems. This was basically a
2371 typo, since it was named "eno" in the comments!
2373 4. The code that waits for the clock to tick (at a resolution of some fraction
2374 of a second) so as to ensure message-id uniqueness was always waiting for
2375 at least one whole tick, when it could have waited for less. [This is
2376 almost certainly not relevant at current processor speeds, where it is
2377 unlikely to ever wait at all. But we try to future-proof.]
2379 5. The function that sleeps for a time interval that includes fractions of a
2380 second contained a race. It did not block SIGALRM between setting the
2381 timer, and suspending (a couple of lines later). If the interval was short
2382 and the sigsuspend() was delayed until after it had expired, the suspension
2383 never ended. On busy systems this could lead to processes getting stuck for
2386 6. Some uncommon configurations may cause a lookup to happen in a queue runner
2387 process, before it forks any delivery processes. The open lookup caching
2388 mechanism meant that the open file or database connection was passed into
2389 the delivery process. The problem was that delivery processes always tidy
2390 up cached lookup data. This could cause a problem for the next delivery
2391 process started by the queue runner, because the external queue runner
2392 process does not know about the closure. So the next delivery process
2393 still has data in the lookup cache. In the case of a file lookup, there was
2394 no problem because closing a file descriptor in a subprocess doesn't affect
2395 the parent. However, if the lookup was caching a connection to a database,
2396 the connection was closed, and the second delivery process was likely to
2397 see errors such as "PGSQL: query failed: server closed the connection
2398 unexpectedly". The problem has been fixed by closing all cached lookups
2399 in a queue runner before running a delivery process.
2401 7. Compiler warning on Linux for the second argument of iconv(), which doesn't
2402 seem to have the "const" qualifier which it has on other OS. I've
2405 8. Change 4.21/2 was too strict. It is only if there are two authenticators
2406 *of the same type* (client or server) with the same public name that an
2407 error should be diagnosed.
2409 9. When Exim looked up a host name for an IP address, but failed to find the
2410 original IP address when looking up the host name (a safety check), it
2411 output the message "<ip address> does not match any IP for NULL", which was
2412 confusing, to say the least. The bug was that the host name should have
2413 appeared instead of "NULL".
2415 10. Since release 3.03, if Exim is called by a uid other than root or the Exim
2416 user that is built into the binary, and the -C or -D options is used, root
2417 privilege is dropped before the configuration file is read. In addition,
2418 logging is switched to stderr instead of the normal log files. If the
2419 configuration then re-defines the Exim user, the unprivileged environment
2420 is probably not what is expected, so Exim logs a panic warning message (but
2423 However, if deliver_drop_privilege is set, the unprivileged state may well
2424 be exactly what is intended, so the warning has been cut out in that case,
2425 and Exim is allowed to try to write to its normal log files.
2431 1. smtp_return_error_details was not giving details for temporary sender
2432 or receiver verification errors.
2434 2. Diagnose a configuration error if two authenticators have the same public
2437 3. Exim used not to create the message log file for a message until the first
2438 delivery attempt. This could be confusing when incoming messages were held
2439 for policy or load reasons. The message log file is now created at the time
2440 the message is received, and an initial "Received" line is written to it.
2442 4. The automatically generated man page for command line options had a minor
2443 bug that caused no ill effects; however, a more serious problem was that
2444 the procedure for building the man page automatically didn't always
2445 operate. Consequently, release 4.20 contains an out-of-date version. This
2446 shouldn't happen again.
2448 5. When building Exim with embedded Perl support, the script that builds the
2449 Makefile was calling 'perl' to find its compile-time parameters, ignoring
2450 any setting of PERL_COMMAND in Local/Makefile. This is now fixed.
2452 6. The freeze_tell option was not being used for messages that were frozen on
2453 arrival, either by an ACL or by local_scan().
2455 7. Added the smtp_incomplete_transaction log selector.
2457 8. After STARTTLS, Exim was not forgetting that it had advertised AUTH, so it
2458 was accepting AUTH without a new EHLO.
2460 9. Added tls_remember_esmtp to cope with YAEB. This allows AUTH and other
2461 ESMTP extensions after STARTTLS without a new EHLO, in contravention of the
2464 10. Logging of TCP/IP connections (when configured) now happens in the main
2465 daemon process instead of the child process, so that the TCP/IP connection
2466 count is more accurate (but it can never be perfect).
2468 11. The use of "drop" in a nested ACL was not being handled correctly in the
2469 outer ACL. Now, if condition failure induced by the nested "drop" causes
2470 the outer ACL verb to deny access ("accept" or "discard" after "endpass",
2471 or "require"), the connection is dropped.
2473 12. Similarly, "discard" in a nested ACL wasn't being handled. A nested ACL
2474 that yield "discard" can now be used with an "accept" or a "discard" verb,
2475 but an error is generated for any others (because I can't see a useful way
2476 to define what should happen).
2478 13. When an ACL is read dynamically from a file (or anywhere else), the lines
2479 are now processed in the same way as lines in the Exim configuration file.
2480 In particular, continuation lines are supported.
2482 14. Added the "dnslists = a.b.c!=n.n.n.n" feature.
2484 15. Added -ti meaning -t -i.
2486 16. Check for letters, digits, hyphens, and dots in the names of dnslist
2487 domains, and warn by logging if others are found.
2489 17. At least on BSD, alignment is not guarenteed for the array of ifreq's
2490 returned from GIFCONF when Exim is trying to find the list of interfaces on
2491 a host. The code in os.c has been modified to copy each ifreq to an aligned
2492 structure in all cases.
2494 Also, in some cases, the returned ifreq's were being copied to a 'struct
2495 ifreq' on the stack, which was subsequently passed to host_ntoa(). That
2496 means the last couple of bytes of an IPv6 address could be chopped if the
2497 ifreq contained only a normal sockaddr (14 bytes storage).
2499 18. Named domain lists were not supported in the hosts_treat_as_local option.
2500 An entry such as +xxxx was not recognized, and was treated as a literal
2503 19. Ensure that header lines added by a DATA ACL are included in the reject log
2504 if the ACL subsequently rejects the message.
2506 20. Upgrade the cramtest.pl utility script to use Digest::MD5 instead of just
2507 MD5 (which is deprecated).
2509 21. When testing a filter file using -bf, Exim was writing a message when it
2510 took the sender from a "From " line in the message, but it was not doing so
2511 when it took $return_path from a Return-Path: header line. It now does.
2513 22. If the contents of a "message" modifier for a "warn" ACL verb do not begin
2514 with a valid header line field name (a series of printing characters
2515 terminated by a colon, Exim now inserts X-ACL-Warn: at the beginning.
2517 23. Changed "disc" in the source to "disk" to conform to the documentation and
2518 the book and for uniformity.
2520 24. Ignore Sendmail's -Ooption=value command line item.
2522 25. When execve() failed while trying to run a command in a pipe transport,
2523 Exim was returning EX_UNAVAILBLE (69) from the subprocess. However, this
2524 could be confused with a return value of 69 from the command itself. This
2525 has been changed to 127, the value the shell returns if it is asked to run
2526 a non-existent command. The wording for the related log line suggests a
2527 non-existent command as the problem.
2529 26. If received_header_text expands to an empty string, do not add a Received:
2530 header line to the message. (Well, it adds a token one on the spool, but
2531 marks it "old" so that it doesn't get used or transmitted.)
2533 27. Installed eximstats 1.28 (addition of -nt option).
2535 28. There was no check for failure on the call to getsockname() in the daemon
2536 code. This can fail if there is a shortage of resources on the system, with
2537 ENOMEM, for example. A temporary error is now given on failure.
2539 29. Contrary to the C standard, it seems that in some environments, the
2540 equivalent of setlocale(LC_ALL, "C") is not obeyed at the start of a C
2541 program. Exim now does this explicitly; it affects the formatting of
2542 timestamps using strftime().
2544 30. If exiqsumm was given junk data, it threw up some uninitialized variable
2545 complaints. I've now initialized all the variables, to avoid this.
2547 32. Header lines added by a system filter were not being "seen" during
2548 transport-time rewrites.
2550 33. The info_callback() function passed to OpenSSL is set up with type void
2551 (*)(SSL *, int, int), as described somewhere. However, when calling the
2552 function (actually a macro) that sets it up, the type void(*)() is
2553 expected. I've put in a cast to prevent warnings from picky compilers.
2555 34. If a DNS black list lookup found a CNAME record, but there were no A
2556 records associated with the domain it pointed at, Exim crashed.
2558 35. If a DNS black list lookup returned more than one A record, Exim ignored
2559 all but the first. It now scans all returned addresses if a particular IP
2560 value is being sought. In this situation, the contents of the
2561 $dnslist_value variable are a list of all the addresses, separated by a
2564 36. Tightened up the rules for host name lookups using reverse DNS. Exim used
2565 to accept a host name and all its aliases if the forward lookup for any of
2566 them yielded the IP address of the incoming connection. Now it accepts only
2567 those names whose forward lookup yields the correct IP address. Any other
2568 names are discarded. This closes a loophole whereby a rogue DNS
2569 administrator could create reverse DNS records to break through a
2570 wildcarded host restriction in an ACL.
2572 37. If a user filter or a system filter that ran in a subprocess used any of
2573 the numerical variables ($1, $2 etc), or $thisaddress, in a pipe command,
2574 the wrong values were passed to the pipe command ($thisaddress had the
2575 value of $0, $0 had the value of $1, etc). This bug was introduced by
2576 change 4.11/101, and not discovered because I wrote an inadequate test. :-(
2578 38. Improved the line breaking for long SMTP error messages from ACLs.
2579 Previously, if there was no break point between 40 and 75 characters, Exim
2580 left the rest of the message alone. Two changes have been made: (a) I've
2581 reduced the minimum length to 35 characters; (b) if it can't find a break
2582 point between 35 and 75 characters, it looks ahead and uses the first one
2583 that it finds. This may give the occasional overlong line, but at least the
2584 remaining text gets split now.
2586 39. Change 82 of 4.11 was unimaginative. It assumed the limit on the number of
2587 file descriptors might be low, and that setting 1000 would always raise it.
2588 It turns out that in some environments, the limit is already over 1000 and
2589 that lowering it causes trouble. So now Exim takes care not to decrease it.
2591 40. When delivering a message, the value of $return_path is set to $sender_
2592 address at the start of routing (routers may change the value). By an
2593 oversight, this default was not being set up when an address was tested by
2594 -bt or -bv, which affected the outcome if any router or filter referred to
2597 41. The idea of the "warn" ACL verb is that it adds a header or writes to the
2598 log only when "message" or "log_message" are set. However, if one of the
2599 conditions was an address verification, or a call to a nested ACL, the
2600 messages generated by the underlying test were being passed through. This
2601 no longer happens. The underlying message is available in $acl_verify_
2602 message for both "message" and "log_message" expansions, so it can be
2603 passed through if needed.
2605 42. Added RFC 2047 interpretation of header lines for $h_ expansions, with a
2606 new expansion $bh_ to give the encoded byte string without charset
2607 translation. Translation happens only if iconv() is available; HAVE_ICONV
2608 indicates this at build time. HEADERS_CHARSET gives the charset to
2609 translate to; headers_charset can change it in the configuration, and
2610 "headers charset" can change it in an individual filter file.
2612 43. Now that we have a default RFC 2047 charset (see above), the code in Exim
2613 that creates RFC 2047 encoded "words" labels them as that charset instead
2614 of always using iso-8859-1. The cases are (i) the explicit ${rfc2047:
2615 expansion operator; (ii) when Exim creates a From: line for a local
2616 message; (iii) when a header line is rewritten to include a "phrase" part.
2618 44. Nasty bug in exiqsumm: the regex to skip already-delivered addresses was
2619 buggy, causing it to skip the first lines of messages whose message ID
2620 ended in 'D'. This would not have bitten before Exim release 4.14, because
2621 message IDs were unlikely to end in 'D' before then. The effect was to have
2622 incorrect size information for certain domains.
2624 45. #include "config.h" was missing at the start of the crypt16.c module. This
2625 caused trouble on Tru64 (aka OSF1) systems, because HAVE_CRYPT16 was not
2628 46. If there was a timeout during a "random" callout check, Exim treated it as
2629 a failure of the random address, and carried on sending RSET and the real
2630 address. If the delay was just some slowness somewhere, the response to the
2631 original RCPT would be taken as a response to RSET and so on, causing
2632 mayhem of various kinds.
2634 47. Change 50 for 4.20 was a heap of junk. I don't know what I was thinking
2635 when I implemented it. It didn't allow for the fact that some option values
2636 may legitimatetly be negative (e.g. size_addition), and it didn't even do
2637 the right test for positive values.
2639 48. Domain names in DNS records are case-independent. Exim always looks them up
2640 in lower case. Some resolvers return domain names in exactly the case they
2641 appear in the zone file, that is, they may contain uppercase letters. Not
2642 all resolvers do this - some return always lower case. Exim was treating a
2643 change of case by a resolver as a change of domain, similar to a widening
2644 of a domain abbreviation. This triggered its re-routing code and so it was
2645 trying to route what was effectively the same domain again. This normally
2646 caused routing to fail (because the router wouldn't handle the domain
2647 twice). Now Exim checks for this case specially, and just changes the
2648 casing of the domain that it ultimately uses when it transmits the message
2651 49. Added Sieve (RFC 3028) support, courtesy of Michael Haardt's contributed
2654 50. If a filter generated a file delivery with a non-absolute name (possible if
2655 no home directory exists for the router), the forbid_file option was not
2658 51. Added '&' feature to dnslists, to provide bit mask matching in addition to
2659 the existing equality matching.
2661 52. Exim was using ints instead of ino_t variables in some places where it was
2662 dealing with inode numbers.
2664 53. If TMPDIR is defined in Local/Makefile (default in src/EDITME is
2665 TMPDIR="/tmp"), Exim checks for the presence of an environment variable
2666 called TMPDIR, and if it finds it is different, it changes its value.
2668 54. The smtp_printf() function is now made available to local_scan() so
2669 additional output lines can be written before returning. There is also an
2670 smtp_fflush() function to enable the detection of a dropped connection.
2671 The variables smtp_input and smtp_batched_input are exported to
2674 55. Changed the default runtime configuration: the message "Unknown user"
2675 has been removed from the ACL, and instead placed on the localuser router,
2676 using the cannot_route_message feature. This means that any verification
2677 failures that generate their own messages won't get overridden. Similarly,
2678 the "Unrouteable address" message that was in the ACL for unverifiable
2679 relay addresses has also been removed.
2681 56. Added hosts_avoid_esmtp to the smtp transport.
2683 57. The exicyclog script was not checking for the esoteric option
2684 CONFIGURE_FILE_USE_EUID in the Local/Makefile. It now does this, but it
2685 will work only if exicyclog is run under the appropriate euid.
2687 58. Following a discussion on the list, the rules by which Exim recognises line
2688 endings on incoming messages have been changed. The -dropcr and drop_cr
2689 options are now no-ops, retained only for backwards compatibility. The
2690 following line terminators are recognized: LF CRLF CR. However, special
2691 processing applies to CR:
2693 (i) The sequence CR . CR does *not* terminate an incoming SMTP message,
2694 nor a local message in the state where . is a terminator.
2696 (ii) If a bare CR is encountered in a header line, an extra space is added
2697 after the line terminator so as not to end the header. The reasoning
2698 behind this is that bare CRs in header lines are most likely either
2699 to be mistakes, or people trying to play silly games.
2701 59. The size of a message, as listed by "-bp" or in the Exim monitor window,
2702 was being incorrectly given as 18 bytes larger than it should have been.
2703 This is a VOB (very old bug).
2705 60. This may never have affected anything current, but just in case it has:
2706 When the local host is found other than at the start of a list of hosts,
2707 the local host, those with the same MX, and any that follow, are discarded.
2708 When the list in question was part of a longer list of hosts, the following
2709 hosts (not currently being processed) were also being discarded. This no
2710 longer happens. I'm not sure if this situation could ever has previously
2713 61. Added the "/MX" feature to lists of hosts in the manualroute and query
2716 62. Whenever Exim generates a new message, it now adds an Auto-Submitted:
2717 header. This is something that is recommended in a new Internet Draft, and
2718 is something that is documented as being done by Sendmail. There are two
2719 possible values. For messages generated by the autoreply transport, Exim
2722 Auto-Submitted: auto-replied
2724 whereas for all other generated messages (e.g. bounces) it adds
2726 Auto-Submitted: auto-generated
2728 63. The "personal" condition in filters now includes a test for the
2729 Auto-Submitted: header. If it contains the string "auto-" the message it
2730 not considered personal.
2732 64. Added rcpt_include_affixes as a generic transport option.
2734 65. Added queue_only_override (default true).
2736 66. Added the syslog_duplication option.
2738 67. If what should have been the first header line of a message consisted of
2739 a space followed by a colon, Exim was mis-interpreting it as a header line.
2740 It isn't of course - it is syntactically invalid and should therefore be
2741 treated as the start of the message body. The misbehaviour could have
2742 caused a number of strange effects, including loss of data in subsequent
2743 header lines, and spool format errors.
2745 68. Formerly, the AUTH parameter on a MAIL command was trusted only if the
2746 client host had authenticated. This control can now be exercised by an ACL
2747 for more flexibility.
2749 69. By default, callouts do not happen when testing with -bh. There is now a
2750 variant, -bhc, which does actually run the callout code, including
2751 consulting and updating the callout cache.
2753 70. Added support for saslauthd authentication, courtesy of Alexander
2756 71. If statvfs() failed on the spool or log directories while checking their
2757 size for availability, Exim confusingly gave the error "space shortage".
2758 Furthermore, in debugging mode it crashed with a floating point exception.
2759 These checks are done if check_{spool,log}_{space,inodes} are set, and when
2760 an SMTP message arrives with SIZE= on the MAIL command. As this is a really
2761 serious problem, Exim now writes to the main and panic logs when this
2762 happens, with details of the failure. It then refuses to accept the
2763 incoming message, giving the message "spool directory problem" or "log
2764 directory problem" with a 421 code for SMTP messages.
2766 72. When Exim is about to re-exec itself, it ensures that the file descriptors
2767 0, 1, and 2 exist, because some OS complain for execs without them (see
2768 ChangeLog 4.05/30). If necessary, Exim opens /dev/null to use for these
2769 descriptors. However, the code omitted to check that the open succeeded,
2770 causing mysterious errors if for some reason the permissions on /dev/null
2771 got screwed. Now Exim writes a message to the main and panic logs, and
2772 bombs out if it can't open /dev/null.
2774 73. Re-vamped the way daemon_smtp_port, local_interfaces, and -oX work and
2775 interact so that it is all more flexible. It is supposed to remain
2776 backwards compatible. Also added extra_local_interfaces.
2778 74. Invalid data sent to a SPA (NTLM) server authenticator could cause the code
2779 to bomb out with an assertion failure - to the client this appears as a
2780 connection drop. This problem occurs in the part of the code that was taken
2781 from the Samba project. Fortunately, the assertion is in a very simple
2782 function, so I have fixed this by reproducing the function inline in the
2783 one place where it is called, and arranging for authentication to fail
2784 instead of killing the process with assert().
2786 75. The SPA client code was not working when the server requested OEM rather
2787 than Unicode encoding.
2789 76. Added code to make require_files with a specific uid setting more usable in
2790 the case where statting the file as root fails - usually a non-root-mounted
2791 NFS file system. When this happens and the failure is EACCES, Exim now
2792 forks a subprocess and does the per-uid checking as the relevant uid.
2794 77. Added process_log_path.
2796 78. If log_file_path was not explicitly set, a setting of check_log_space or
2797 check_log_inodes was ignored.
2799 79. If a space check for the spool or log partitions fails, the incident is now
2800 logged. Of course, in the latter case the data may get lost...
2802 80. Added the %p formatting code to string_format() so that it can be used to
2803 print addresses in debug_print(). Adjusted all the address printing in the
2804 debugging in store.c to use %p rather than %d.
2806 81. There was a concern that a line of code in smtp_in.c could overflow a
2807 buffer if a HELO/EHLO command was given followed by 500 or so spaces. As
2808 initially expressed, the concern was not well-founded, because trailing
2809 spaces are removed early. However, if the trailing spaces were followed by
2810 a NULL, they did not get removed, so the overflow was possible. Two fixes
2813 (a) I re-wrote the offending code in a cleaner fashion.
2814 (b) If an incoming SMTP command contains a NULL character, it is rejected
2817 82. When Exim changes uid/gid to the Exim user at daemon start time, it now
2818 runs initgroups(), so that if the Exim user is in any additional groups,
2819 they will be used during message reception.
2825 The change log for 4.20 and earlier releases has been archived.
git://git.exim.org / users / jgh / exim.git / blob