1 $Cambridge: exim/doc/doc-txt/ChangeLog,v 1.17 2004/11/05 14:59:12 ph10 Exp $
3 Change log file for Exim from version 4.21
4 -------------------------------------------
10 1. Minor wording change to the doc/README.SIEVE file.
12 2. Change 4.43/35 introduced a bug: if quota_filecount was set, the
13 computation of the current number of files was incorrect.
15 3. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
16 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
19 4. Give more explanation in the error message when the command for a transport
20 filter fails to execute.
22 5. There are several places where Exim runs a non-Exim command in a
23 subprocess. The SIGUSR1 signal should be disabled for these processes. This
24 was being done only for the command run by the queryprogram router. It is
25 now done for all such subprocesses. The other cases are: ${run, transport
26 filters, and the commands run by the lmtp and pipe transports.
28 6. Added CONFIGURE_GROUP build-time option.
30 7. Some older OS have a limit of 256 on the maximum number of file
31 descriptors. Exim was using setrlimit() to set 1000 as a large value
32 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
33 systems. I've change it so that if it can't get 1000, it tries for 256.
35 8. "control=submission" was allowed, but had no effect, in a DATA ACL. This
36 was an oversight, and furthermore, ever since the addition of extra
37 controls (e.g. 4.43/32), the checks on when to allow different forms of
38 "control" were broken. There should now be diagnostics for all cases when a
39 control that does not make sense is encountered.
41 9. Added the /retain_sender option to "control=submission".
43 10. $recipients is now available in the predata ACL (oversight).
45 11. Tidy the search cache before the fork to do a delivery from a message
46 received from the command line. Otherwise the child will trigger a lookup
47 failure and thereby defer the delivery if it tries to use (for example) a
48 cached ldap connection that the parent has called unbind on.
50 12. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
51 of $address_data from the recipient verification was clobbered by the
54 13. The value of address_data from a sender verification is now available in
55 $sender_address_data in subsequent conditions in the ACL statement.
57 14. Added forbid_sieve_filter and forbid_exim_filter to the redirect router.
59 15. Added a new option "connect=<time>" to callout options, to set a different
62 16. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
63 was its contents. (It was OK if the option was not defined at all.)
65 17. A "Completed" log line is now written for messages that are removed from
66 the spool by the -Mrm option.
72 1. Fixed a longstanding but relatively impotent bug: a long time ago, before
73 PIPELINING, the function smtp_write_command() used to return TRUE or FALSE.
74 Now it returns an integer. A number of calls were still expecting a T/F
75 return. Fortuitously, in all cases, the tests worked in OK situations,
76 which is the norm. However, things would have gone wrong on any write
77 failures on the smtp file descriptor. This function is used when sending
78 messages over SMTP and also when doing verify callouts.
80 2. When Exim is called to do synchronous delivery of a locally submitted
81 message (the -odf or -odi options), it no longer closes stderr before doing
84 3. Implemented the mua_wrapper option.
86 4. Implemented mx_fail_domains and srv_fail_domains for the dnslookup router.
88 5. Implemented the functions header_remove(), header_testname(),
89 header_add_at_position(), and receive_remove_recipient(), and exported them
92 6. If an ACL "warn" statement specified the addition of headers, Exim already
93 inserted X-ACL-Warn: at the start if there was no header name. However, it
94 was not making this test for the second and subsequent header lines if
95 there were newlines in the string. This meant that an invalid header could
96 be inserted if Exim was badly configured.
98 7. Allow an ACL "warn" statement to add header lines at the start or after all
99 the Received: headers, as well as at the end.
101 8. Added the rcpt_4xx retry error code.
103 9. Added postmaster_mailfrom=xxx to callout verification option.
105 10. Added mailfrom=xxxx to the callout verification option, for verify=
108 11. ${substr_1_:xxxx} and ${substr__3:xxxx} are now diagnosed as syntax errors
109 (they previously behaved as ${substr_1_0:xxxx} and ${substr:_0_3:xxxx}).
111 12. Inserted some casts to stop certain compilers warning when using pointer
112 differences as field lengths or precisions in printf-type calls (mostly
113 affecting debugging statements).
115 13. Added optional readline() support for -be (dynamically loaded).
117 14. Obscure bug fix: if a message error (e.g. 4xx to MAIL) happened within the
118 same clock tick as a message's arrival, so that its received time was the
119 same as the "first fail" time on the retry record, and that message
120 remained on the queue past the ultimate address timeout, every queue runner
121 would try a delivery (because it was past the ultimate address timeout) but
122 after another failure, the ultimate address timeout, which should have then
123 bounced the address, did not kick in. This was a "< instead of <=" error;
124 in most cases the first failure would have been in the next clock tick
125 after the received time, and all would be well.
127 15. The special items beginning with @ in domain lists (e.g. @mx_any) were not
128 being recognized when the domain list was tested by the match_domain
129 condition in an expansion string.
131 16. Added the ${str2b64: operator.
133 17. Exim was always calling setrlimit() to set a large limit for the number of
134 processes, without checking whether the existing limit was already
135 adequate. (It did check for the limit on file descriptors.) Furthermore,
136 errors from getrlimit() and setrlimit() were being ignored. Now they are
137 logged to the main and panic logs, but Exim does carry on, to try to do its
138 job under whatever limits there are.
140 18. Imported PCRE 5.0.
142 19. Trivial typo in log message " temporarily refused connection" (the leading
145 20. If the log selector return_path_on_delivery was set and an address was
146 redirected to /dev/null, the delivery process crashed because it assumed
147 that a return path would always be set for a "successful" delivery. In this
148 case, the whole delivery is bypassed as an optimization, and therefore no
151 21. Internal re-arrangement: the function for sending a challenge and reading
152 a response while authentication was assuming a zero-terminated challenge
153 string. It's now changed to take a pointer and a length, to allow for
154 binary data in such strings.
156 22. Added the cyrus_sasl authenticator (code supplied by MBM).
158 23. Exim was not respecting finduser_retries when seeking the login of the
159 uid under which it was called; it was always trying 10 times. (The default
160 setting of finduser_retries is zero.) Also, it was sleeping after the final
161 failure, which is pointless.
163 24. Implemented tls_on_connect_ports.
165 25. Implemented acl_smtp_predata.
167 26. If the domain in control=submission is set empty, Exim assumes that the
168 authenticated id is a complete email address when it generates From: or
169 Sender: header lines.
171 27. Added "#define SOCKLEN_T int" to OS/os.h-SCO and OS/os.h-SCO_SV. Also added
172 definitions to OS/Makefile-SCO and OS/Makefile-SCO_SV that put basename,
173 chown and chgrp in /bin and hostname in /usr/bin.
175 28. Exim was keeping the "process log" file open after each use, just as it
176 does for the main log. This opens the possibility of it remaining open for
177 long periods when the USR1 signal hits a daemon. Occasional processlog
178 errors were reported, that could have been caused by this. Anyway, it seems
179 much more sensible not to leave this file open at all, so that is what now
182 29. The long-running daemon process does not normally write to the log once it
183 has entered its main loop, and it closes the log before doing so. This is
184 so that log files can straightforwardly be renamed and moved. However,
185 there are a couple of unusual error situations where the daemon does write
186 log entries, and I had neglected to close the log afterwards.
188 30. The text of an SMTP error response that was received during a remote
189 delivery was being truncated at 512 bytes. This is too short for some of
190 the long messages that one sometimes sees. I've increased the limit to
193 31. It is now possible to make retry rules that apply only when a message has a
194 specific sender, in particular, an empty sender.
196 32. Added "control = enforce_sync" and "control = no_enforce_sync". This makes
197 it possible to be selective about when SMTP synchronization is enforced.
199 33. Added "control = caseful_local_part" and "control = "caselower_local_part".
201 32. Implemented hosts_connection_nolog.
203 33. Added an ACL for QUIT.
205 34. Setting "delay_warning=" to disable warnings was not working; it gave a
208 35. Added mailbox_size and mailbox_filecount to appendfile.
210 36. Added control = no_multiline_responses to ACLs.
212 37. There was a bug in the logic of the code that waits for the clock to tick
213 in the case where the clock went backwards by a substantial amount such
214 that the microsecond fraction of "now" was more than the microsecond
215 fraction of "then" (but the whole seconds number was less).
217 38. Added support for the libradius Radius client library this is found on
218 FreeBSD (previously only the radiusclient library was supported).
224 1. When certain lookups returned multiple values in the form name=value, the
225 quoting of the values was not always being done properly. Specifically:
226 (a) If the value started with a double quote, but contained no whitespace,
228 (b) If the value contained whitespace other than a space character (i.e.
229 tabs or newlines or carriage returns) it was not quoted.
230 This fix has been applied to the mysql and pgsql lookups by writing a
231 separate quoting function and calling it from the lookup code. The fix
232 should probably also be applied to nisplus, ibase and oracle lookups, but
233 since I cannot test any of those, I have not disturbed their existing code.
235 2. A hit in the callout cache for a specific address caused a log line with no
236 reason for rejecting RCPT. Now it says "Previous (cached) callout
237 verification failure".
239 3. There was an off-by-one bug in the queryprogram router. An over-long
240 return line was truncated at 256 instead of 255 characters, thereby
241 overflowing its buffer with the terminating zero. As well as fixing this, I
242 have increased the buffer size to 1024 (and made a note to document this).
244 4. If an interrupt, such as the USR1 signal that is send by exiwhat, arrives
245 when Exim is waiting for an SMTP response from a remote server, Exim
246 restarts its select() call on the socket, thereby resetting its timeout.
247 This is not a problem when such interrupts are rare. Somebody set up a cron
248 job to run exiwhat every 2 minutes, which is less than the normal select()
249 timeout (5 or 10 minutes). This meant that the select() timeout never
250 kicked in because it was always reset. I have fixed this by comparing the
251 time when an interrupt arrives with the time at the start of the first call
252 to select(). If more time than the timeout has elapsed, the interrupt is
253 treated as a timeout.
255 5. Some internal re-factoring in preparation for the addition of Sieve
256 extensions (by MH). In particular, the "personal" test is moved to a
257 separate function, and given an option for scanning Cc: and Bcc: (which is
258 not set for Exim filters).
260 6. When Exim created an email address using the login of the caller as the
261 local part (e.g. when creating a From: or Sender: header line), it was not
262 quoting the local part when it contained special characters such as @.
264 7. Installed new OpenBSD configuration files.
266 8. Reworded some messages for syntax errors in "and" and "or" conditions to
267 try to make them clearer.
269 9. Callout options, other than the timeout value, were being ignored when
270 verifying sender addresses in header lines. For example, when using
272 verify = header_sender/callout=no_cache
274 the cache was (incorrectly) being used.
276 10. Added a missing instance of ${EXE} to the exim_install script; this affects
277 only the Cygwin environment.
279 11. When return_path_on_delivery was set as a log selector, if different remote
280 addresses in the same message used different return paths and parallel
281 remote delivery occurred, the wrong values would sometimes be logged.
282 (Whenever a remote delivery process finished, the return path value from
283 the most recently started remote delivery process was logged.)
285 12. RFC 3848 specifies standard names for the "with" phrase in Received: header
286 lines when AUTH and/or TLS are in use. This is the "received protocol"
287 field. Exim used to use "asmtp" for authenticated SMTP, without any
288 indication (in the protocol name) for TLS use. Now it follows the RFC and
289 uses "esmtpa" if the connection is authenticated, "esmtps" if it is
290 encrypted, and "esmtpsa" if it is both encrypted and authenticated. These
291 names appear in log lines as well as in Received: header lines.
293 13. Installed MH's patches for Sieve to add the "copy" and "vacation"
294 extensions, and comparison tests, and to fix some bugs.
296 14. Changes to the "personal" filter test:
298 (1) The test was buggy in that it was just doing the equivalent of
299 "contains" tests on header lines. For example, if a user's address was
300 anne@some.where, the "personal" test would incorrectly be true for
302 To: susanne@some.where
304 This test is now done by extracting each address from the header in turn,
305 and checking the entire address. Other tests that are part of "personal"
306 are now done using regular expressions (for example, to check local parts
307 of addresses in From: header lines).
309 (2) The list of non-personal local parts in From: addresses has been
310 extended to include "listserv", "majordomo", "*-request", and "owner-*",
311 taken from the Sieve specification recommendations.
313 (3) If the message contains any header line starting with "List-" it is
314 treated as non-personal.
316 (4) The test for "circular" in the Subject: header line has been removed
317 because it now seems ill-conceived.
319 15. Minor typos in src/EDITME comments corrected.
321 16. Installed latest exipick from John Jetmore.
323 17. If headers_add on a router specified a text string that was too long for
324 string_sprintf() - that is, longer than 8192 bytes - Exim panicked. The use
325 of string_sprintf() is now avoided.
327 18. $message_body_size was not set (it was always zero) when running the DATA
328 ACL and the local_scan() function.
330 19. For the "mail" command in an Exim filter, no default was being set for
331 the once_repeat time, causing a random time value to be used if "once" was
332 specified. (If the value happened to be <= 0, no repeat happened.) The
333 default is now 0s, meaning "never repeat". The "vacation" command was OK
334 (its default is 7d). It's somewhat surprising nobody ever noticed this bug
335 (I found it when inspecting the code).
337 20. There is now an overall timeout for performing a callout verification. It
338 defaults to 4 times the callout timeout, which applies to individual SMTP
339 commands during the callout. The overall timeout applies when there is more
340 than one host that can be tried. The timeout is checked before trying the
341 next host. This prevents very long delays if there are a large number of
342 hosts and all are timing out (e.g. when the network connections are timing
343 out). The value of the overall timeout can be changed by specifying an
344 additional sub-option for "callout", called "maxwait". For example:
346 verify = sender/callout=5s,maxwait=20s
348 21. Add O_APPEND to the open() call for maildirsize files (Exim already seeks
349 to the end before writing, but this should make it even safer).
351 22. Exim was forgetting that it had advertised PIPELINING for the second and
352 subsequent messages on an SMTP connection. It was also not resetting its
353 memory on STARTTLS and an internal HELO.
355 23. When Exim logs an SMTP synchronization error within a session, it now
356 records whether PIPELINING has been advertised or not.
358 24. Added 3 instances of "(long int)" casts to time_t variables that were being
359 formatted using %ld, because on OpenBSD (and perhaps others), time_t is int
360 rather than long int.
362 25. Installed the latest Cygwin configuration files from the Cygwin maintainer.
364 26. Added the never_mail option to autoreply.
370 1. A reorganization of the code in order to implement 4.40/8 caused a daemon
371 crash if the getsockname() call failed; this can happen if a connection is
372 closed very soon after it is established. The problem was simply in the
373 order in which certain operations were done, causing Exim to try to write
374 to the SMTP stream before it had set up the file descriptor. The bug has
375 been fixed by making things happen in the correct order.
381 1. If "drop" was used in a DATA ACL, the SMTP output buffer was not flushed
382 before the connection was closed, thus losing the rejection response.
384 2. Commented out the definition of SOCKLEN_T in os.h-SunOS5. It is needed for
385 some early Solaris releases, but causes trouble in current releases where
386 socklen_t is defined.
388 3. When std{in,out,err} are closed, re-open them to /dev/null so that they
391 4. Minor refactoring of os.c-Linux to avoid compiler warning when IPv6 is not
394 5. Refactoring in expand.c to improve memory usage. Pre-allocate a block so
395 that releasing the top of it at the end releases what was used for sub-
396 expansions (unless the block got too big). However, discard this block if
397 the first thing is a variable or header, so that we can use its block when
398 it is dynamic (useful for very large $message_headers, for example).
400 6. Lookups now cache *every* query, not just the most recent. A new, separate
401 store pool is used for this. It can be recovered when all lookup caches are
402 flushed. Lookups now release memory at the end of their result strings.
403 This has involved some general refactoring of the lookup sources.
405 7. Some code has been added to the store_xxx() functions to reduce the amount
406 of flapping under certain conditions.
408 8. log_incoming_interface used to affect only the <= reception log lines. Now
409 it causes the local interface and port to be added to several more SMTP log
410 lines, for example "SMTP connection from", and rejection lines.
412 9. The Sieve author supplied some patches for the doc/README.SIEVE file.
414 10. Added a conditional definition of _BSD_SOCKLEN_T to os.h-Darwin.
416 11. If $host_data was set by virtue of a hosts lookup in an ACL, its value
417 could be overwritten at the end of the current message (or the start of a
418 new message if it was set in a HELO ACL). The value is now preserved for
419 the duration of the SMTP connection.
421 12. If a transport had a headers_rewrite setting, and a matching header line
422 contained an unqualified address, that address was qualified, even if it
423 did not match any rewriting rules. The underlying bug was that the values
424 of the flags that permit the existence of unqualified sender and recipient
425 addresses in header lines (set by {sender,recipient}_unqualified_hosts for
426 non-local messages, and by -bnq for local messages) were not being
427 preserved with the message after it was received.
429 13. When Exim was logging an SMTP synchronization error, it could sometimes log
430 "next input=" as part of the text comprising the host identity instead of
431 the correct text. The code was using the same buffer for two different
432 strings. However, depending on which order the printing function evaluated
433 its arguments, the bug did not always show up. Under Linux, for example, my
434 test suite worked just fine.
436 14. Exigrep contained a use of Perl's "our" scoping after change 4.31/70. This
437 doesn't work with some older versions of Perl. It has been changed to "my",
438 which in any case is probably the better facility to use.
440 15. A really picky compiler found some instances of statements for creating
441 error messages that either had too many or two few arguments for the format
444 16. The size of the buffer for calls to the DNS resolver has been increased
445 from 1024 to 2048. A larger buffer is needed when performing PTR lookups
446 for addresses that have a lot of PTR records. This alleviates a problem; it
447 does not fully solve it.
449 17. A dnsdb lookup for PTR records that receives more data than will fit in the
450 buffer now truncates the list and logs the incident, which is the same
451 action as happens when Exim is looking up a host name and its aliases.
452 Previously in this situation something unpredictable would happen;
453 sometimes it was "internal error: store_reset failed".
455 18. If a server dropped the connection unexpectedly when an Exim client was
456 using GnuTLS and trying to read a response, the client delivery process
457 crashed while trying to generate an error log message.
459 19. If a "warn" verb in an ACL added multiple headers to a message in a single
462 warn message = H1: something\nH2: something
464 the text was added as a single header line from Exim's point of view
465 though it ended up OK in the delivered message. However, searching for the
466 second and subsequent header lines using $h_h2: did not work. This has been
467 fixed. Similarly, if a system filter added multiple headers in this way,
468 the routers could not see them.
470 20. Expanded the error message when iplsearch is called with an invalid key to
471 suggest using net-iplsearch in a host list.
473 21. When running tests using -bh, any delays imposed by "delay" modifiers in
474 ACLs are no longer actually imposed (and a message to that effect is
477 22. If a "gecos" field in a passwd entry contained escaped characters, in
478 particular, if it contained a \" sequence, Exim got it wrong when building
479 a From: or a Sender: header from that name. A second bug also caused
480 incorrect handling when an unquoted " was present following a character
483 23. "{crypt}" as a password encryption mechanism for a "crypteq" expansion item
484 was not being matched caselessly.
486 24. Arranged for all hyphens in the exim.8 source to be escaped with
489 25. Change 16 of 4.32, which reversed 71 or 4.31 didn't quite do the job
490 properly. Recipient callout cache records were still being keyed to include
491 the sender, even when use_sender was set false. This led to far more
492 callouts that were necessary. The sender is no longer included in the key
493 when use_sender is false.
495 26. Added "control = submission" modifier to ACLs.
497 27. Added the ${base62d: operator to decode base 62 numbers.
499 28. dnsdb lookups can now access SRV records.
501 29. CONFIGURE_OWNER can be set at build time to define an alternative owner for
502 the configuration file.
504 30. The debug message "delivering xxxxxx-xxxxxx-xx" is now output in verbose
505 (-v) mode. This makes the output for a verbose queue run more intelligible.
507 31. Added a use_postmaster feature to recipient callouts.
509 32. Added the $body_zerocount variable, containing the number of binary zero
510 bytes in the message body.
512 33. The time of last modification of the "new" subdirectory is now used as the
513 "mailbox time last read" when there is a quota error for a maildir
516 34. Added string comparison operators lt, lti, le, lei, gt, gti, ge, gei.
518 35. Added +ignore_unknown as a special item in host lists.
520 36. Code for decoding IPv6 addresses in host lists is now included, even if
521 IPv6 support is not being compiled. This fixes a bug in which an IPv6
522 address was recognized as an IP address, but was then not correctly decoded
523 into binary, causing unexpected and incorrect effects when compared with
530 1. Very minor rewording of debugging text in manualroute to say "list of
531 hosts" instead of "hostlist".
533 2. If verify=header_syntax was set, and a header line with an unqualified
534 address (no domain) and a large number of spaces between the end of the
535 name and the colon was received, the reception process suffered a buffer
536 overflow, and (when I tested it) crashed. This was caused by some obsolete
537 code that should have been removed. The fix is to remove it!
539 3. When running in the test harness, delay a bit after writing a bounce
540 message to get a bit more predictability in the log output.
542 4. Added a call to search_tidyup() just before forking a reception process. In
543 theory, someone could use a lookup in the expansion of smtp_accept_max_
544 per_host which, without the tidyup, could leave open a database connection.
546 5. Added the variables $recipient_data and $sender_data which get set from a
547 lookup success in an ACL "recipients" or "senders" condition, or a router
548 "senders" option, similar to $domain_data and $local_part_data.
550 6. Moved the writing of debug_print from before to after the "senders" test
553 7. Change 4.31/66 (moving the time when the Received: is generated) caused
554 problems for message scanning, either using a data ACL, or using
555 local_scan() because the Received: header was not generated till after they
556 were called (in order to set the time as the time of reception completion).
557 I have revised the way this works. The header is now generated after the
558 body is received, but before the ACL or local_scan() are called. After they
559 are run, the timestamp in the header is updated.
565 1. Change 4.24/6 introduced a bug because the SIGALRM handler was disabled
566 before starting a queue runner without re-exec. This happened only when
567 deliver_drop_privilege was set or when the Exim user was set to root. The
568 effect of the bug was that timeouts during subsequent deliveries caused
569 crashes instead of being properly handled. The handler is now left at its
570 default (and expected) setting.
572 2. The other case in which a daemon avoids a re-exec is to deliver an incoming
573 message, again when deliver_drop_privilege is set or Exim is run as root.
574 The bug described in (1) was not present in this case, but the tidying up
575 of the other signals was missing. I have made the two cases consistent.
577 3. The ignore_target_hosts setting on a manualroute router was being ignored
578 for hosts that were looked up using the /MX notation.
580 4. Added /ignore=<ip list> feature to @mx_any, @mx_primary, and @mx_secondary
583 5. Change 4.31/55 was buggy, and broke when there was a rewriting rule that
584 operated on the sender address. After changing the $sender_address to <>
585 for the sender address verify, Exim was re-instated it as the original
586 (before rewriting) address, but remembering that it had rewritten it, so it
587 wasn't rewriting it again. This bug also had the effect of breaking the
588 sender address verification caching when the sender address was rewritten.
590 6. The ignore_target_hosts option was being ignored by the ipliteral router.
591 This has been changed so that if the ip literal address matches
592 ignore_target_hosts, the router declines.
594 7. Added expansion conditions match_domain, match_address, and match_local_
595 part (NOT match_host).
597 8. The placeholder for the Received: header didn't have a length field set.
599 9. Added code to Exim itself and to exim_lock to test for a specific race
600 condition that could lead to file corruption when using MBX delivery. The
601 issue is with the lockfile that is created in /tmp. If this file is removed
602 after a process has opened it but before that process has acquired a lock,
603 there is the potential for a second process to recreate the file and also
604 acquire a lock. This could lead to two Exim processes writing to the file
605 at the same time. The added code performs the same test as UW imapd; it
606 checks after acquiring the lock that its file descriptor still refers to
609 10. The buffer for building added header lines was of fixed size, 8192 bytes.
610 It is now parameterized by HEADER_ADD_BUFFER_SIZE and this can be adjusted
613 11. Added the smtp_active_hostname option. If used, this will typically be made
614 to depend on the incoming interface address. Because $interface_address is
615 not set up until the daemon has forked a reception process, error responses
616 that can happen earlier (such as "too many connections") no longer contain
619 12. If an expansion in a condition on a "warn" statement fails because a lookup
620 defers, the "warn" statement is abandoned, and the next ACL statement is
621 processed. Previously this caused the whole ACL to be aborted.
623 13. Added the iplsearch lookup type.
625 14. Added ident_timeout as a log selector.
627 15. Added tls_certificate_verified as a log selector.
629 16. Added a global option tls_require_ciphers (compare the smtp transport
630 option of the same name). This controls incoming TLS connections.
632 17. I finally figured out how to make tls_require_ciphers do a similar thing
633 in GNUtls to what it does in OpenSSL, that is, set up an appropriate list
634 before starting the TLS session.
636 18. Tabs are now shown as \t in -bP output.
638 19. If the log selector return_path_on_delivery was set, Exim crashed when
639 bouncing a message because it had too many Received: header lines.
641 20. If two routers both had headers_remove settings, and the first one included
642 a superfluous trailing colon, the final name in the first list and the
643 first name in the second list were incorrectly joined into one item (with a
644 colon in the middle).
650 1. Added -C and -D options to the exinext utility, mainly to make it easier
651 to include in the automated testing, but these could be helpful when
652 multiple configurations are in use.
654 2. The exinext utility was not formatting the output nicely when there was
655 an alternate port involved in the retry record key, nor when there was a
656 message id as well (for retries that were specific to a specific message
657 and a specific host). It was also confused by IPv6 addresses, because of
658 the additional colons they contain. I have fixed the IPv4 problem, and
659 patched it up to do a reasonable job for IPv6.
661 3. When there is an error after a MAIL, RCPT, or DATA SMTP command during
662 delivery, the log line now contains "pipelined" if PIPELINING was used.
664 4. An SMTP transport process used to panic and die if the bind() call to set
665 an explicit outgoing interface failed. This has been changed; it is now
666 treated in the same way as a connect() failure.
668 5. A reference to $sender_host_name in the part of a conditional expansion
669 that was being skipped was still causing a DNS lookup. This no longer
672 6. The def: expansion condition was not recognizing references to header lines
673 that used bh_ and bheader_.
675 7. Added the _cache feature to named lists.
677 8. The code for checking quota_filecount in the appendfile transport was
678 allowing one more file than it should have been.
680 9. For compatibility with Sendmail, the command line option
688 and sets the incoming protocol and host name (for trusted callers). The
689 host name and its colon can be omitted when only the protocol is to be set.
690 Note the Exim already has two private options, -pd and -ps, that refer to
691 embedded Perl. It is therefore impossible to set a protocol value of "d" or
692 "s", but I don't think that's a major issue.
694 10. A number of refactoring changes to the code, none of which should affect
697 (a) The number of logging options was getting close to filling up the
698 32-bit word that was used as a bit map. I have split them into two classes:
699 those that are passed in the argument to log_write(), and those that are
700 only ever tested independently outside of that function. These are now in
701 separate 32-bit words, so there is plenty of room for expansion again.
702 There is no change in the user interface or the logging behaviour.
704 (b) When building, for example, log lines, the code previously used a
705 macro that called string_cat() twice, in order to add two strings. This is
706 not really sufficiently general. Furthermore, there was one instance where
707 it was actually wrong because one of the argument was used twice, and in
708 one call a function was used. (As it happened, calling the function twice
709 did not affect the overall behaviour.) The macro has been replaced by a
710 function that can join an arbitrary number of extra strings onto a growing
713 (c) The code for expansion conditions now uses a table and a binary chop
714 instead of a serial search (which was left over from when there were very
715 few conditions). Also, it now recognizes conditions like "pam" even when
716 the relevant support is not compiled in: a suitably worded error message is
717 given if an attempt is made to use such a condition.
719 11. Added ${time_interval:xxxxx}.
721 12. A bug was causing one of the ddress fields not to be passed back correctly
722 from remote delivery subprocesses. The field in question was not being
723 subsequently used, so this caused to problems in practice.
725 13. Added new log selectors queue_time and deliver_time.
727 14. Might have fixed a bug in maildirsizefile handling that threw up
728 "unexpected character" debug warnings, and recalculated the data
729 unnecessarily. In any case, I expanded the warning message to give more
732 15. Added the message "Restricted characters in address" to the statements in
733 the default ACL that block characters like @ and % in local parts.
735 16. Change 71 for release 4.31 proved to be much less benign that I imagined.
736 Three changes have been made:
738 (a) There was a serious bug; a negative response to MAIL caused the whole
739 recipient domain to be cached as invalid, thereby blocking all messages
740 to all local parts at the same domain, from all senders. This bug has
741 been fixed. The domain is no longer cached after a negative response to
742 MAIL if the sender used is not empty.
744 (b) The default behaviour of using MAIL FROM:<> for recipient callouts has
747 (c) A new callout option, "use_sender" has been added for people who want
748 the modified behaviour.
754 1. Removed "EXTRALIBS=-lwrap" from OS/Makefile-Unixware7 on the advice of
757 2. Removed "LIBS = -lresolv" from OS/Makefile-Darwin as it is not needed, and
758 indeed breaks things for older releases.
760 3. Added additional logging to the case where there is a problem reading data
761 from a filter that is running in a subprocess using a pipe, in order to
762 try to track down a specific problem.
764 4. Testing facility fudge: when running in the test harness and attempting
765 to connect to 10.x.x.x (expecting a connection timeout) I'm now sometimes
766 getting "No route to host". Convert this to a timeout.
768 5. Define ICONV_ARG2_TYPE as "char **" for Unixware7 to avoid compiler
771 6. Some OS don't have socklen_t but use size_t instead. This affects the
772 fifth argument of getsockopt() amongst other things. This is now
773 configurable by a macro called SOCKLEN_T which defaults to socklen_t, but
774 can be set for individual OS. I have set it for SunOS5, OSF1, and
775 Unixware7. Current versions of SunOS5 (aka Solaris) do have socklen_t, but
776 some earlier ones do not.
778 7. Change 4.30/15 was not doing the test caselessly.
780 8. The standard form for an IPv6 address literal was being rejected by address
781 parsing in, for example, MAIL and RCPT commands. An example of this kind of
782 address is [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
783 this, as well as the form without the "IPv6" on the front (but only when
784 address literals are enabled, of course).
786 9. Added some casts to avoid compiler warnings in OS/os.c-Linux.
788 10. Exim crashed if a message with an empty sender address specified by -f
789 encountered a router with an errors_to setting. This could be provoked only
794 where an empty string was supplied; "<>" did not hit this bug.
796 11. Installed PCRE release 4.5.
798 12. If EHLO/HELO was rejected by an ACL, the value of $sender_helo_name
799 remained set. It is now erased.
801 13. exiqgrep wasn't working on MacOS X because it didn't correctly compute
802 times from message ids (which are base 36 rather than the normal 62).
804 14. "Expected" SMTP protocol errors that can arise when PIPELINING is in use
805 were being counted as actual protocol errors, and logged if the log
806 selector +smtp_protocol_error was set. One cannot be perfect in this test,
807 but now, if PIPELINING has been advertised, RCPT following a rejected MAIL,
808 and DATA following a set of rejected RCPTs do not count as protocol errors.
809 In other words, Exim assumes they were pipelined, though this may not
810 actually be the case. Of course, in all cases the client gets an
811 appropriate error code.
813 15. If a lookup fails in an ACL condition, a message about the failure may
814 be available; it is used if testing the ACL cannot continue, because most
815 such messages specify what the cause of the deferral is. However, some
816 messages (e.g. "MYSQL: no data found") do not cause a defer. There was bug
817 that caused an old message to be retained and used if a later statement
818 caused a defer, replacing the real cause of the deferral.
820 16. If an IP address had so many PTR records that the DNS lookup buffer
821 was not large enough to hold them, Exim could crash while trying to process
822 the truncated data. It now detects and logs this case.
824 17. Further to 4.21/58, another change has been made: if (and only if) the
825 first line of a message (the first header line) ends with CRLF, a bare LF
826 in a subsequent header line has a space inserted after it, so as not to
827 terminate the header.
829 18. Refactoring: tidied an ugly bit of code in appendfile that copied data
830 unnecessarily, used atoi() instead of strtol(), and didn't check the
831 termination when getting file sizes from file names by regex.
833 19. Completely re-implemented the support for maildirsize files, in the light
834 of a number of problems with the previous contributed implementation
835 (4.30/29). In particular:
837 . If the quota is zero, the maildirsize file is maintained, but no quota is
840 . If the maildir directory does not exist, it is created before any attempt
841 to write a maildirsize file.
843 . The quota value in the file is just a cache; if the quota is changed in
844 the transport, the new value overrides.
846 . A regular expression is available for excluding directories from the
849 20. The autoreply transport checks the characters in options that define the
850 message's headers; it allows continued headers, but it was checking with
851 isspace() after an embedded newline instead of explicitly looking for a
854 21. If all the "regular" hosts to which an address was routed had passed their
855 expiry times, and had not reached their retry times, the address was
856 bounced, even if fallback hosts were defined. Now Exim should go on to try
859 22. Increased buffer sizes in the callout code from 1024 to 4096 to match the
860 equivalent code in the SMTP transport. Some hosts send humungous responses
861 to HELO/EHLO, more than 1024 it seems.
863 23. Refactoring: code in filter.c used (void *) for "any old type" but this
864 gives compiler warnings in some environments. I've now done it "properly",
867 24. The replacement for inet_ntoa() that is used with gcc on IRIX systems
868 (because of problems with the built-in one) was declared to return uschar *
869 instead of char *, causing compiler failure.
871 25. Fixed a file descriptor leak when processing alias/forward files.
873 26. Fixed a minor format string issue in dbfn.c.
875 27. Typo in exim.c: ("dmbnz" for "dbmnz").
877 28. If a filter file refered to $h_xxx or $message_headers, and the headers
878 contained RFC 2047 "words", Exim's memory could, under certain conditions,
881 29. When a sender address is verified, it is cached, to save repeating the test
882 when there is more than one recipient in a message. However, when the
883 verification involves a callout, it is possible for different callout
884 options to be set for different recipients. It is too complicated to keep
885 track of this in the cache, so now Exim always runs a verification when a
886 callout is required, relying on the callout cache for the optimization.
887 The overhead is duplication of the address routing, but this should not be
890 30. Fixed a bug in callout caching. If a RCPT command caused the sender address
891 to be verified with callout=postmaster, and the main callout worked but the
892 postmaster check failed, the verification correctly failed. However, if a
893 subsequent RCPT command asked for sender verification *without* the
894 postmaster check, incorrect caching caused this verification also to fail,
897 31. Exim caches DNS lookup failures so as to avoid multiple timeouts; however,
898 it was not caching the DNS options (qualify_single, search_parents) that
899 were used when the lookup failed. A subsequent lookup with different
900 options therefore always gave the same answer, though there were cases
901 where it should not have. (Example: a "domains = !$mx_any" option on a
902 dnslookup router: the "domains" option is always processed without any
903 widening, but the router might have qualify_single set.) Now Exim uses the
904 cached value only when the same options are set.
906 32. Added John Jetmore's "exipick" utility to the distribution.
908 33. GnuTLS: When an attempt to start a TLS session fails for any reason other
909 than a timeout (e.g. a certificate is required, and is not provided), an
910 Exim server now closes the connection immediately. Previously it waited for
911 the client to close - but if the client is SSL, it seems that they each
912 wait for each other, leading to a delay before one of them times out.
914 34: GnuTLS: Updated the code to use the new GnuTLS 1.0.0 API. I have not
915 maintained 0.8.x compatibility because I don't think many are using it, and
916 it is clearly obsolete.
918 35. Added TLS support for CRLs: a tls_crl global option and one for the smtp
921 36. OpenSSL: $tls_certificate_verified was being set to 1 even if the
922 client certificate was expired. A simple patch fixes this, though I don't
923 understand the full logic of why the verify callback is called multiple
926 37. OpenSSL: a patch from Robert Roselius: "Enable client-bug workaround.
927 Versions of OpenSSL as of 0.9.6d include a 'CBC countermeasure' feature,
928 which causes problems with some clients (such as the Certicom SSL Plus
929 library used by Eudora). This option, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS,
930 disables the coutermeasure allowing Eudora to connect."
932 38. Exim was not checking that a write() to a log file succeeded. This could
933 lead to Bad Things if a log got too big, in particular if it hit a file
934 size limit. Exim now panics and dies if it cannot write to a log file, just
935 as it does if it cannot open a log file.
937 39. Modified OS/Makefile-Linux so that it now contains
939 CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
941 The two -D definitions ensure that Exim is compiled with large file
942 support, which makes it possible to handle log files that are bigger than
945 40. Fixed a subtle caching bug: if (in an ACL or a set of routers, for
946 instance) a domain was checked against a named list that involved a lookup,
947 causing $domain_data to be set, then another domain was checked against the
948 same list, then the first domain was re-checked, the value of $domain_data
949 after the final check could be wrong. In particular, if the second check
950 failed, it could be set empty. This bug probably also applied to
953 41. The strip_trailing_dot option was not being applied to the address given
954 with the -f command-line option.
956 42. The code for reading a message's header from the spool was incrementing
957 $received_count, but never initializing it. This meant that the value was
958 incorrect (doubled) while delivering a message in the same process in which
959 it was received. In the most common configuration of Exim, this never
960 happens - a fresh exec is done - but it can happen when
961 deliver_drop_privilege is set.
963 43. When Exim logs an SMTP synchronization error - client data sent too soon -
964 it now includes up to 150 characters of the unexpected data in the log
967 44. The exim_dbmbuild utility uses fixed size buffers for reading input lines
968 and building data strings. The size of both of these buffers was 10 000
969 bytes - far larger than anybody would *ever* want, thought I. Needless to
970 say, somebody hit the limit. I have increased the maximum line length to
971 20 000 and the maximum data length of concatenated lines to 100 000. I have
972 also fixed two bugs, because there was no checking on these buffers. Tsk,
973 tsk. Now exim_dbmbuild gives a message and exits with an error code if a
976 45. The exim_dbmbuild utility did not support quoted keys, as Exim does in
977 lsearch lookups. Now it does.
979 46. When parsing a route_list item in a manualroute router, a fixed-length
980 buffer was used for the list of hosts. I made this 1024 bytes long,
981 thinking that nobody would ever have a list of hosts that long. Wrong.
982 Somebody had a whole pile of complicated expansion conditions, and the
983 string was silently truncated, leading to an expansion error. It turns out
984 that it is easier to change to an unlimited length (owing to other changes
985 that have happened since this code was originally written) than to build
986 structure for giving a limitation error. The length of the item that
987 expands into the list of hosts is now unlimited.
989 47. The lsearch lookup could not handle data where the length of text line was
990 more than 4095 characters. Such lines were truncated, leading to shortened
991 data being returned. It should now handle lines of any length.
993 48. Minor wording revision: "cannot test xxx in yyy ACL" becomes "cannot test
994 xxx condition in yyy ACL" (e.g. "cannot test domains condition in DATA
997 49. Cosmetic tidy to scripts like exicyclog that are generated by globally
998 replacing strings such as BIN_DIRECTORY in a source file: the replacement
999 no longer happens in comment lines. A list of replacements is now placed
1000 at the head of all of the source files, except those whose only change is
1001 to replace PERL_COMMAND in the very first #! line.
1003 50. Replaced the slow insertion sort in queue.c, for sorting the list of
1004 messages on the queue, with a bottom-up merge sort, using code contributed
1005 by Michael Haardt. This should make operations like -bp somewhat faster on
1006 large queues. It won't affect queue runners, except when queue_run_in_order
1009 51. Installed eximstats 1.31 in the distribution.
1011 52. Added support for SRV lookups to the dnslookup router.
1013 53. If an ACL referred to $message_body or $message_body_end, the value was not
1014 reset for any messages that followed in the same SMTP session.
1016 54. The store-handling optimization for building very long strings was not
1017 differentiating between the different store pools. I don't think this
1018 actually made any difference in practice, but I've tidied it.
1020 55. While running the routers to verify a sender address, $sender_address
1021 was still set to the sender address. This is wrong, because when routing to
1022 send a bounce to the sender, it would be empty. Therefore, I have changed
1023 it so that, while verifying a sender address, $sender_address is set to <>.
1024 (There is no change to what happens when verifying a recipient address.)
1026 56. After finding MX (or SRV) records, Exim was doing a DNS lookup for the
1027 target A or AAAA records (if not already returned) without resetting the
1028 qualify_single or search_parents options of the DNS resolver. These are
1029 inappropriate in this case because the targets of MX and SRV records must
1030 be FQDNs. A broken DNS record could cause trouble if it happened to have a
1031 target that, when qualified, matched something in the local domain. These
1032 two options are now turned off when doing these lookups.
1034 57. It seems that at least some releases of Reiserfs (which does not have the
1035 concept of a fixed number of inodes) returns zero and not -1 for the
1036 number of available inodes. This interacted badly with check_spool_inodes,
1037 which assumed that -1 was the "no such thing" setting. What I have done is
1038 to check that the total number of inodes is greater than zero before doing
1039 the test of how many are available.
1041 58. When a "warn" ACL statement has a log_message modifier, the message is
1042 remembered, and not repeated. This is to avoid a lot of repetition when a
1043 message has many recipients that cause the same warning to be written.
1044 Howewer, Exim was preserving the list of already written lines for an
1045 entire SMTP session, which doesn't seem right. The memory is now reset if a
1046 new message is started.
1048 59. The "rewrite" debugging flag was not showing the result of rewriting in the
1049 debugging output unless log_rewrite was also set.
1051 60. Avoid a compiler warning on 64-bit systems in dsearch.c by avoiding the use
1052 of (int)(handle) when we know that handle contains (void *)(-1).
1054 61. The Exim daemon panic-logs an error return when it closes the incoming
1055 connection. However "connection reset by peer" seems to be common, and
1056 isn't really an error worthy of noting specially, so that particular error
1059 62. When Exim is trying to find all the local interfaces, it used to panic and
1060 die if the ioctl to get the interface flags failed. However, it seems that
1061 on at least one OS (Solaris 9) it is possible to have an interface that is
1062 included in the list of interfaces, but for which you get a failure error
1063 for this call. This happens when the interface is not "plumbed" into a
1064 protocol (i.e. neither IPv4 nor IPv6). I've changed the code so that a
1065 failure of the "get flags" call assumes that the interface is down.
1067 63. Added a ${eval10: operator, which assumes all numbers are decimal. This
1068 makes life easier for people who are doing arithmetic on fields extracted
1069 from dates, where you often get leading zeros that should not be
1070 interpreted as octal.
1072 64. Added qualify_domain to the redirect router, to override the global
1075 65. If a pathologically long header line contained very many addresses (the
1076 report of this problem mentioned 10 000) and each of them was rewritten,
1077 Exim could use up a very large amount of memory. (It kept on making new
1078 copies of the header line as it rewrote, and never released the old ones.)
1079 At the expense of a bit more processing, the header rewriting function has
1080 been changed so that it no longer eats memory in this way.
1082 66. The generation of the Received: header has been moved from the time that a
1083 message starts to be received, to the time that it finishes. The timestamp
1084 in the Received: header should now be very close to that of the <= log
1085 line. There are two side-effects of this change:
1087 (a) If a message is rejected by a DATA or non-SMTP ACL or local_scan(), the
1088 logged header lines no longer include the local Received: line, because
1089 it has not yet been created. The same applies to a copy of the message
1090 that is returned to a non-SMTP sender when a message is rejected.
1092 (b) When a filter file is tested using -bf, no additional Received: header
1093 is added to the test message. After some thought, I decided that this
1096 This change does not affect the value of $received_for. It is still set
1097 after address rewriting, but before local_scan() is called.
1099 67. Installed the latest Cygwin-specific files from the Cygwin maintainer.
1101 68. GnuTLS: If an empty file is specified for tls_verify_certificates, GnuTLS
1102 gave an unhelpful panic error message, and a defer error. I have managed to
1103 change this behaviour so that it now rejects any supplied certificate,
1104 which seems right, as the list of acceptable certificates is empty.
1106 69. OpenSSL: If an empty file is specified for tls_verify_certificates, OpenSSL
1107 gave an unhelpful defer error. I have not managed to make this reject any
1108 supplied certificates, but the error message it gives is "no certificate
1109 supplied", which is not helpful.
1111 70. exigrep's output now also includes lines that are not associated with any
1112 message, but which match the given pattern. Implemented by a patch from
1113 Martin Sluka, which also tidied up the Perl a bit.
1115 71. Recipient callout verification, like sender verification, was using <> in
1116 the MAIL FROM command. This isn't really the right thing, since the actual
1117 sender may affect whether the remote host accepts the recipient or not. I
1118 have changed it to use the actual sender in the callout; this means that
1119 the cache record is now keyed on a recipient/sender pair, not just the
1120 recipient address. There doesn't seem to be a real danger of callout loops,
1121 since a callout by the remote host to check the sender would use <>.
1122 [SEE ABOVE: changed after hitting problems.]
1124 72. Exim treats illegal SMTP error codes that do not begin with 4 or 5 as
1125 temporary errors. However, in the case of such a code being given after
1126 the end of a data transmission (i.e. after ".") Exim was failing to write
1127 a retry record for the message. (Yes, there was some broken host that was
1128 actually sending 8xx at this point.)
1130 73. An unknown lookup type in a host list could cause Exim to panic-die when
1131 the list was checked. (An example that provoked this was putting <; in the
1132 middle of a list instead of at the start.) If this happened during a DATA
1133 ACL check, a -D file could be left lying around. This kind of configuration
1134 error no longer causes Exim to die; instead it causes a defer errror. The
1135 incident is still logged to the main and panic logs.
1137 74. Buglet left over from Exim 3 conversion. The message "too many messages
1138 in one connection" was written to the rejectlog but not the mainlog, except
1139 when address rewriting (yes!) was being logged.
1141 75. Added write_rejectlog option.
1143 76. When a system filter was run not as root (that is, when system_filter_user
1144 was set), the values of the $n variables were not being returned to the
1145 main process; thus, they were not subsequently available in the $sn
1148 77. Added +return_path_on_delivery log selector.
1150 78. A connection timeout was being treated differently from recipients deferred
1151 when testing hosts_max_try with a message that was older than the host's
1152 retry timeout. (The host should not be counted, thus allowing all hosts to
1153 be tried at least once before bouncing.) This may have been the cause of an
1154 occasionally reported bug whereby a message would remain on the queue
1155 longer than the retry timeout, but would be bounced if a delivery was
1156 forced. I say "may" because I never totally pinned down the problem;
1157 setting up timeout/retry tests is difficult. See also the next item.
1159 79. The ultimate address timeout was not being applied to errors that involved
1160 a combination of host plus message (for example, a timeout on a MAIL
1161 command). When an address resolved to a number of possible hosts, and they
1162 were not all tried for each delivery (e.g. because of hosts_max_try), a
1163 message could remain on the queue longer than the retry timeout.
1165 80. Sieve bug: "stop" inside "elsif" was broken. Applied a patch from Michael
1168 81. Fixed an obscure SMTP outgoing bug which required at least the following
1169 conditions: (a) there was another message waiting for the same server;
1170 (b) the server returned 5xx to all RCPT commands in the first message so
1171 that the message was not completed; (c) the server dropped the connection
1172 or gave a negative response to the RSET that Exim sends to abort the
1173 transaction. The observed case was a dropped connection after DATA that had
1174 been sent in pipelining mode. That is, the server had advertised PIPELINING
1175 but was not implementing it correctly. The effect of the bug was incorrect
1176 behaviour, such as trying another host, and this could lead to a crash.
1182 1. The 3rd arguments to getsockname(), getpeername(), and accept() in exim.c
1183 and daemon.c were passed as pointers to ints; they should have been
1184 pointers to socklen_t variables (which are typically unsigned ints).
1186 2. Some signed/unsigned type warnings in the os.c file for Linux have been
1189 3. Fixed a really odd bug that affected only the testing scheme; patching a
1190 certain fixed string in the binary changed the value of another string that
1191 happened to be identical to the end of the original first string.
1193 4. When gethostbyname() (or equivalent) is passed an IP address as a "host
1194 name", it returns that address as the IP address. On some operating
1195 systems (e.g. Solaris), it also passes back the IP address string as the
1196 "host name". However, on others (e.g. Linux), it passes back an empty
1197 string. Exim wasn't checking for this, and was changing the host name to an
1198 empty string, assuming it had been canonicized.
1200 5. Although rare, it is permitted to have more than one PTR record for a given
1201 IP address. I thought that gethostbyaddr() or getipnodebyaddr() always gave
1202 all the names associated with an address, because they do in Solaris.
1203 However, it seems that they do not in Linux for data that comes from the
1204 DNS. If an address in /etc/hosts has multiple names, they _are_ all given.
1205 I found this out when I moved to a new Linux workstation and tried to run
1206 the Exim test suite.
1208 To get round this problem I have changed the code so that it now does its
1209 own call to the DNS to look up PTR records when searching for a host name.
1210 If nothing can be found in the DNS, it tries gethostbyaddr(), so that
1211 addresses that are only in /etc/hosts are still found.
1213 This behaviour is, however, controlled by an option called host_lookup_
1214 order, which defaults to "bydns:byaddr". If people want to use the other
1215 order, or indeed, just use one or the other means of lookup, they can
1216 specify it in this variable.
1218 6. If a PTR record yields an empty name, Exim treats it as non-existent. In
1219 some operating systems, this comes back from gethostbyaddr() as an empty
1220 string, and this is what Exim used to test for. However, it seems that in
1221 other systems, "." is yielded. Exim now tests for this case too.
1223 7. The values of check_spool_space and check_log_space are now held internally
1224 as a number of kilobytes instead of an absolute number of bytes. If a
1225 numbers is specified without 'K' or 'M', it is rounded up to the nearest
1226 kilobyte. This means that much larger values can be stored.
1228 8. Exim monitor: an attempt to get the action menu when not actually pointing
1229 at a message produces an empty menu entitled "No message selected". This
1230 works on Solaris (OpenWindows). However, XFree86 does not like a menu with
1231 no entries in it ("Shell widget menu has zero width and/or height"). So I
1232 have added a single, blank menu entry in this case.
1234 9. Added ${quote_local_part.
1236 10. MIME decoding is now applied to the contents of Subject: header lines when
1239 11. Now that a reference to $sender_host_address automatically causes a reverse
1240 lookup to occur if necessary (4.13/18), there is no need to arrange for a
1241 host lookup before query-style lookups in lists that might use this
1242 variable. This has therefore been abolished, and the "net-" prefix is no
1243 longer necessary for query-style lookups.
1245 12. The Makefile for SCO_SV contained a setting of LDFLAGS. This appears to
1246 have been a typo for LFLAGS, so it has been changed.
1248 13. The install script calls Exim with "-C /dev/null" in order to find the
1249 version number. If ALT_CONFIG_PREFIX was set, this caused an error message
1250 to be output. Howeve, since Exim outputs its version number before the
1251 error, it didn't break the script. It just looked ugly. I fixed this by
1252 always allowing "-C /dev/null" if the caller is root.
1254 14. Ignore overlarge ACL variable number when reading spool file - insurance
1255 against a later release with more variables having written the file.
1257 15. The standard form for an IPv6 address literal was being rejected by EHLO.
1258 Example: [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
1259 this, as well as the form without the "IPv6" on the front.
1261 16. Added CHOWN_COMMAND=/usr/sbin/chown and LIBS=-lresolv to the
1262 OS/Makefile-Darwin file.
1264 17. Fixed typo in lookups/ldap.c: D_LOOKUP should be D_lookup. This applied
1265 only to LDAP libraries that do not have LDAP_OPT_DEREF.
1267 18. After change 4.21/52, "%ld" was used to format the contents of the $inode
1268 variable. However, some OS use ints for inodes. I've added cast to long int
1269 to get rid of the compiler warning.
1271 19. I had forgotten to lock out "/../" in configuration file names when
1272 ALT_CONFIG_PREFIX was set.
1274 20. Routers used for verification do not need to specify transports. However,
1275 if such a router generated a host list, and callout was configured, Exim
1276 crashed, because it could not find a port number from the (non-existent)
1277 transport. It now assumes port 25 in this circumstance.
1279 21. Added the -t option to exigrep.
1281 22. If LOOKUP_LSEARCH is defined, all three linear search methods (lsearch,
1282 wildlsearch, nwildlsearch) are compiled. LOOKUP_WILDLSEARCH and LOOKUP_
1283 NWILDLSEARCH are now obsolete, but retained for compatibility. If either of
1284 them is set, LOOKUP_LSEARCH is forced.
1286 23. "exim -bV" now outputs a list of lookups that are included in the binary.
1288 24. Added sender and host information to the "rejected by local_scan()" log
1289 line; previously there was no indication of these.
1291 25. Added .include_if_exists.
1293 26. Change 3.952/11 added an explicit directory sync on top of a file sync for
1294 Linux. It turns out that not all file systems support this. Apparently some
1295 versions of NFS do not. (It's rare to put Exim's spool on NFS, but people
1296 do it.) To cope with this, the error EINVAL, which means that sync-ing is
1297 not supported on the file descriptor, is now ignored when Exim is trying to
1298 sync a directory. This applies only to Linux.
1300 27. Added -DBIND_8_COMPAT to the CLFAGS setting for Darwin.
1302 28. In Darwin (MacOS X), the PAM headers are in /usr/include/pam and not in
1303 /usr/include/security. There's now a flag in OS/os.h-Darwin to cope with
1306 29. Added support for maildirsize files from supplied patch (modified a bit).
1308 30. The use of :fail: followed by an empty string could lead Exim to respond to
1309 sender verification failures with (e.g.):
1311 550 Verification failed for <xxx>
1312 550 Sender verify failed
1314 where the first response line was missing the '-' that indicates it is not
1315 the final line of the response.
1317 31. The loop for finding the name of the user that called Exim had a hardwired
1318 limit of 10; it now uses the value of finduser_retries, which is used for
1319 all other user lookups.
1321 32. Added $received_count variable, available in data and not_smtp ACLs, and at
1324 33. Exim was neglecting to zero errno before one call of strtol() when
1325 expanding a string and expecting an integer value. On some systems this
1326 resulted in spurious "integer overflow" errors. Also, it was casting the
1327 result into an int without checking.
1329 34. Testing for a connection timeout using "timeout_connect" in the retry rules
1330 did not work. The code looks as if it has *never* worked, though it appears
1331 to have been documented since at least releast 1.62. I have made it work.
1333 35. The "timeout_DNS" error in retry rules, also documented since at least
1334 1.62, also never worked. As it isn't clear exactly what this means, and
1335 clearly it isn't a major issue, I have abolished the feature by treating it
1336 as "timeout", and writing a warning to the main and panic logs.
1338 36. The display of retry rules for -brt wasn't always showing the error code
1341 37. Added new error conditions to retry rules: timeout_A, timeout_MX,
1342 timeout_connect_A, timeout_connect_MX.
1344 38. Rewriting the envelope sender at SMTP time did not allow it to be rewritten
1345 to the empty sender.
1347 39. The daemon was not analysing the content of -oX till after it had closed
1348 stderr and disconnected from the controlling terminal. This meant that any
1349 syntax errors were only noted on the panic log, and the return code from
1350 the command was 0. By re-arranging the code a little, I've made the
1351 decoding happen first, so such errors now appear on stderr, and the return
1352 code is 1. However, the actual setting up of the sockets still happens in
1353 the disconnected process, so errors there are still only recorded on the
1356 40. A daemon listener on a wildcard IPv6 socket that also accepts IPv4
1357 connections (as happens on some IP stacks) was logged at start up time as
1358 just listening for IPv6. It now logs "IPv6 with IPv4". This differentiates
1359 it from "IPv6 and IPv4", which means that two separate sockets are being
1362 41. The debug output for gethostbyname2() or getipnodebyname() failures now
1363 says whether AF_INET or AF_INET6 was passed as an argument.
1365 42. Exiwhat output was messed up when time zones were included in log
1368 43. Exiwhat now gives more information about the daemon's listening ports,
1369 and whether -tls-on-connect was used.
1371 44. The "port" option of the smtp transport is now expanded.
1373 45. A "message" modifier in a "warn" statement in a non-message ACL was being
1374 silently ignored. Now an error message is written to the main and panic
1377 46. There's a new ACL modifier called "logwrite" which writes to a log file
1378 as soon as it is encountered.
1380 47. Added $local_user_uid and $local_user_gid at routing time.
1382 48. Exim crashed when trying to verify a sender address that was being
1385 49. Exim was recognizing only a space character after ".include". It now also
1386 recognizes a tab character.
1388 50. Fixed several bugs in the Perl script that creates the exim.8 man page by
1389 extracting the relevant information from the specification. The man page no
1390 longer contains scrambled data for the -d option, and I've added a section
1391 at the front about calling Exim under different names.
1393 51. Added "extra_headers" argument to the "mail" command in filter files.
1395 52. Redirecting mail to an unqualified address in a Sieve filter caused Exim to
1398 53. Installed eximstats 1.29.
1400 54. Added transport_filter_timeout as a generic transport option.
1402 55. Exim no longer adds an empty Bcc: header to messages that have no To: or
1403 Cc: header lines. This was required by RFC 822, but it not required by RFC
1406 56. Exim used to add From:, Date:, and Message-Id: header lines to any
1407 incoming messages that did not have them. Now it does so only if the
1408 message originates locally, that is, if there is no associated remote host
1409 address. When Resent- header lines are present, this applies to the Resent-
1410 lines rather than the non-Resent- lines.
1412 57. Drop incoming SMTP connection after too many syntax or protocol errors. The
1413 limit is controlled by smtp_max_synprot_errors, defaulting to 3.
1415 58. Messages for configuration errors now include the name of the main
1416 configuration file - useful now that there may be more than one file in a
1417 list (.included file names were always shown).
1419 59. Change 4.21/82 (run initgroups() when starting the daemon) causes problems
1420 for those rare installations that do not start the daemon as root or run it
1421 setuid root. I've cut out the call to initgroups() if the daemon is not
1424 60. The Exim user and group can now be bound into the binary as text strings
1425 that are looked up at the start of Exim's processing.
1427 61. Applied a small patch for the Interbase code, supplied by Ard Biesheuvel.
1429 62. Added $mailstore_basename variable.
1431 63. Installed patch to sieve.c from Michael Haardt.
1433 64. When Exim failed to open the panic log after failing to open the main log,
1434 the original message it was trying to log was written to stderr and debug
1435 output, but if they were not available (the usual case in production), it
1436 was lost. Now it is written to syslog before the two lines that record the
1437 failures to open the logs.
1439 65. Users' Exim filters run in subprocesses under the user's uid. It is
1440 possible for a "deliver" command or an alias in a "personal" command to
1441 provoke an address rewrite. If logging of address rewriting is configured,
1442 this fails because the process is not running as root or exim. There may be
1443 a better way of dealing with this, but for the moment (because 4.30 needs
1444 to be released), I have disabled address rewrite logging when running a
1445 filter in a non-root, non-exim process.
1451 1. The buildconfig auxiliary program wasn't quoting the value set for
1452 HEADERS_CHARSET. This caused a compilation error complaining that 'ISO' was
1453 not defined. This bug was masked in 4.22 by the effect that was fixed in
1456 2. Some messages that were rejected after a message id was allocated were
1457 shown as "incomplete" by exigrep. It no longer does this for messages that
1458 are rejected by local_scan() or the DATA or non-SMTP ACLs.
1460 3. If a Message-ID: header used a domain literal in the ID, and Exim did not
1461 have allow_domain_literals set, the ID did not get logged in the <= line.
1462 Domain literals are now always recognized in Message-ID: header lines.
1464 4. The first argument for a ${extract expansion item is the key name or field
1465 number. Leading and trailing spaces in this item were not being ignored,
1466 causing some misleading effects.
1468 5. When deliver_drop_privilege was set, single queue runner processes started
1469 manually (i.e. by the command "exim -q") or by the daemon (which uses the
1470 same command in the process it spins off) were not dropping privilege.
1472 6. When the daemon running as "exim" started a queue runner, it always
1473 re-executed Exim in the spun-off process. This is a waste of effort when
1474 deliver_drop_privilege is set. The new process now just calls the
1475 queue-runner function directly.
1481 1. Typo in the src/EDITME file: it referred to HEADERS_DECODE_TO instead of
1484 2. Change 4.21/73 introduced a bug. The pid file path set by -oP was being
1485 ignored. Though the use of -oP was forcing the writing of a pid file, it
1486 was always written to the default place.
1488 3. If the message "no IP address found for host xxxx" is generated during
1489 incoming verification, it is now followed by identification of the incoming
1490 connection (so you can more easily find what provoked it).
1492 4. Bug fix for Sieve filters: "stop" inside a block was not working properly.
1494 5. Added some features to "harden" Exim a bit more against certain attacks:
1496 (a) There is now a build-time option called FIXED_NEVER_USERS that can
1497 be put in Local/Makefile. This is like the never_users runtime option,
1498 but it cannot be overridden. The default setting is "root".
1500 (b) If ALT_CONFIG_PREFIX is defined in Local/Makefile, it specifies a
1501 prefix string with which any file named in a -C command line option
1504 (c) If ALT_CONFIG_ROOT_ONLY is defined in Local/Makefile, root privilege
1505 is retained for -C and -D only if the caller of Exim is root. Without
1506 it, the exim user may also use -C and -D and retain privilege.
1508 (d) If DISABLE_D_OPTION is defined in Local/Makefile, the use of the -D
1509 command line option is disabled.
1511 6. Macro names set by the -D option must start with an upper case letter, just
1512 like macro names defined in the configuration file.
1514 7. Added "dereference=" facility to LDAP.
1516 8. Two instances of the typo "uknown" in the source files are fixed.
1518 9. If a PERL_COMMAND setting in Local/Makefile was not at the start of a line,
1519 the Configure-Makefile script screwed up while processing it.
1521 10. Incorporated PCRE 4.4.
1523 11. The SMTP synchronization check was not operating right at the start of an
1524 SMTP session. For example, it could not catch a HELO sent before the client
1525 waited for the greeting. There is now a check for outstanding input at the
1526 point when the greeting is written. Because of the duplex, asynchronous
1527 nature of TCP/IP, it cannot be perfect - the incorrect input may be on its
1528 way, but not yet received, when the check is performed.
1530 12. Added tcp_nodelay to make it possible to turn of the setting of TCP_NODELAY
1531 on TCP/IP sockets, because this apparently causes some broken clients to
1534 13. Installed revised OS/Makefile-CYGWIN and OS/os.c-cygwin (the .h file was
1535 unchanged) from the Cygwin maintainer.
1537 14. The code for -bV that shows what is in the binary showed "mbx" when maildir
1538 was supported instead of testing for mbx. Effectively a typo.
1540 15. The spa authenticator server code was not checking that the input it
1541 received was valid base64.
1543 16. The debug output line for the "set" modifier in ACLs was not showing the
1544 name of the variable that was being set.
1546 17. Code tidy: the variable type "vtype_string" was never used. Removed it.
1548 18. Previously, a reference to $sender_host_name did not cause a DNS reverse
1549 lookup on its own. Something else was needed to trigger the lookup. For
1550 example, a match in host_lookup or the need for a host name in a host list.
1551 Now, if $sender_host_name is referenced and the host name has not yet been
1552 looked up, a lookup is performed. If the lookup fails, the variable remains
1553 empty, and $host_lookup_failed is set to "1".
1555 19. Added "eqi" as a case-independent comparison operator.
1557 20. The saslauthd authentication condition could segfault if neither service
1558 nor realm was specified.
1560 21. If an overflowing value such as "2048M" was set for message_size_limit, the
1561 error message that was logged was misleading, and incoming SMTP
1562 connections were dropped. The message is now more accurate, and temporary
1563 errors are given to SMTP connections.
1565 22. In some error situations (such as 21 above) Exim rejects all SMTP commands
1566 (except RSET) with a 421 error, until QUIT is received. However, it was
1567 failing to send a response to QUIT.
1569 23. The HELO ACL was being run before the code for helo_try_verify_hosts,
1570 which made it impossible to use "verify = helo" in the HELO ACL. The HELO
1571 ACL is now run after the helo_try_verify_hosts code.
1573 24. "{MD5}" and "{SHA1}" are now recognized as equivalent to "{md5"} and
1574 "{sha1}" in the "crypteq" expansion condition (in fact the comparison is
1575 case-independent, so other case variants are also recognized). Apparently
1576 some systems use these upper case variants.
1578 25. If more than two messages were waiting for the same host, and a transport
1579 filter was specified for the transport, Exim sent two messages over the
1580 same TCP/IP connection, and then failed with "socket operation on non-
1581 socket" when it tried to send the third.
1583 26. Added Exim::debug_write and Exim::log_write for embedded Perl use.
1585 27. The extern definition of crypt16() in expand.c was not being excluded when
1586 the OS had its own crypt16() function.
1588 28. Added bounce_return_body as a new option, and bounce_return_size_limit
1589 as a preferred synonym for return_size_limit, both as an option and as an
1592 29. Added LIBS=-liconv to OS/Makefile-OSF1.
1594 30. Changed the default configuration ACL to relax the local part checking rule
1595 for addresses that are not in any local domains. For these addresses,
1596 slashes and pipe symbols are allowed within local parts, but the sequence
1597 /../ is explicitly forbidden.
1599 31. SPA server authentication was not clearing the challenge buffer before
1602 32. log_message in a "warn" ACL statement was writing to the reject log as
1603 well as to the main log, which contradicts the documentation and doesn't
1604 seem right (because no rejection is happening). So I have stopped it.
1606 33. Added Ard Biesheuvel's lookup code for accessing an Interbase database.
1607 However, I am unable to do any testing of this.
1609 34. Fixed an infelicity in the appendfile transport. When checking directories
1610 for a mailbox, to see if any needed to be created, it was accidentally
1611 using path names with one or more superfluous leading slashes; tracing
1612 would show up entries such as stat("///home/ph10", 0xFFBEEA48).
1614 35. If log_message is set on a "discard" verb in a MAIL or RCPT ACL, its
1615 contents are added to the log line that is written for every discarded
1616 recipient. (Previously a log_message setting was ignored.)
1618 36. The ${quote: operator now quotes the string if it is empty.
1620 37. The install script runs exim in order to find its version number. If for
1621 some reason other than non-existence or emptiness, which it checks, it
1622 could not run './exim', it was installing it with an empty version number,
1623 i.e. as "exim-". This error state is now caught, and the installation is
1626 38. An argument was missing from the function that creates an error message
1627 when Exim fails to connect to the socket for saslauthd authentication.
1628 This could cause Exim to crash, or give a corrupted message.
1630 39. Added isip, isip4, and isip6 to ${if conditions.
1632 40. The ACL variables $acl_xx are now saved with the message, and can be
1633 accessed later in routers, transports, and filters.
1635 41. The new lookup type nwildlsearch is like wildlsearch, except that the key
1636 strings in the file are not string-expanded.
1638 42. If a MAIL command specified a SIZE value that was too large to fit into an
1639 int variable, the check against message_size_limit failed. Such values are
1640 now forced to INT_MAX, which is around 2Gb for a 32-bit variable. Maybe one
1641 day this will have to be increased, but I don't think I want to be around
1642 when emails are that large.
1649 1. Removed HAVE_ICONV=yes from OS/Makefile-FreeBSD, since it seems that
1650 iconv() is not standard in FreeBSD.
1652 2. Change 4.21/17 was buggy and could cause stack overwriting on a system with
1653 IPv6 enabled. The observed symptom was a segmentation fault on return from
1654 the function os_common_find_running_interfaces() in src/os.c.
1656 3. In the check_special_case() function in daemon.c I had used "errno" as an
1657 argument name, which causes warnings on some systems. This was basically a
1658 typo, since it was named "eno" in the comments!
1660 4. The code that waits for the clock to tick (at a resolution of some fraction
1661 of a second) so as to ensure message-id uniqueness was always waiting for
1662 at least one whole tick, when it could have waited for less. [This is
1663 almost certainly not relevant at current processor speeds, where it is
1664 unlikely to ever wait at all. But we try to future-proof.]
1666 5. The function that sleeps for a time interval that includes fractions of a
1667 second contained a race. It did not block SIGALRM between setting the
1668 timer, and suspending (a couple of lines later). If the interval was short
1669 and the sigsuspend() was delayed until after it had expired, the suspension
1670 never ended. On busy systems this could lead to processes getting stuck for
1673 6. Some uncommon configurations may cause a lookup to happen in a queue runner
1674 process, before it forks any delivery processes. The open lookup caching
1675 mechanism meant that the open file or database connection was passed into
1676 the delivery process. The problem was that delivery processes always tidy
1677 up cached lookup data. This could cause a problem for the next delivery
1678 process started by the queue runner, because the external queue runner
1679 process does not know about the closure. So the next delivery process
1680 still has data in the lookup cache. In the case of a file lookup, there was
1681 no problem because closing a file descriptor in a subprocess doesn't affect
1682 the parent. However, if the lookup was caching a connection to a database,
1683 the connection was closed, and the second delivery process was likely to
1684 see errors such as "PGSQL: query failed: server closed the connection
1685 unexpectedly". The problem has been fixed by closing all cached lookups
1686 in a queue runner before running a delivery process.
1688 7. Compiler warning on Linux for the second argument of iconv(), which doesn't
1689 seem to have the "const" qualifier which it has on other OS. I've
1692 8. Change 4.21/2 was too strict. It is only if there are two authenticators
1693 *of the same type* (client or server) with the same public name that an
1694 error should be diagnosed.
1696 9. When Exim looked up a host name for an IP address, but failed to find the
1697 original IP address when looking up the host name (a safety check), it
1698 output the message "<ip address> does not match any IP for NULL", which was
1699 confusing, to say the least. The bug was that the host name should have
1700 appeared instead of "NULL".
1702 10. Since release 3.03, if Exim is called by a uid other than root or the Exim
1703 user that is built into the binary, and the -C or -D options is used, root
1704 privilege is dropped before the configuration file is read. In addition,
1705 logging is switched to stderr instead of the normal log files. If the
1706 configuration then re-defines the Exim user, the unprivileged environment
1707 is probably not what is expected, so Exim logs a panic warning message (but
1710 However, if deliver_drop_privilege is set, the unprivileged state may well
1711 be exactly what is intended, so the warning has been cut out in that case,
1712 and Exim is allowed to try to write to its normal log files.
1718 1. smtp_return_error_details was not giving details for temporary sender
1719 or receiver verification errors.
1721 2. Diagnose a configuration error if two authenticators have the same public
1724 3. Exim used not to create the message log file for a message until the first
1725 delivery attempt. This could be confusing when incoming messages were held
1726 for policy or load reasons. The message log file is now created at the time
1727 the message is received, and an initial "Received" line is written to it.
1729 4. The automatically generated man page for command line options had a minor
1730 bug that caused no ill effects; however, a more serious problem was that
1731 the procedure for building the man page automatically didn't always
1732 operate. Consequently, release 4.20 contains an out-of-date version. This
1733 shouldn't happen again.
1735 5. When building Exim with embedded Perl support, the script that builds the
1736 Makefile was calling 'perl' to find its compile-time parameters, ignoring
1737 any setting of PERL_COMMAND in Local/Makefile. This is now fixed.
1739 6. The freeze_tell option was not being used for messages that were frozen on
1740 arrival, either by an ACL or by local_scan().
1742 7. Added the smtp_incomplete_transaction log selector.
1744 8. After STARTTLS, Exim was not forgetting that it had advertised AUTH, so it
1745 was accepting AUTH without a new EHLO.
1747 9. Added tls_remember_esmtp to cope with YAEB. This allows AUTH and other
1748 ESMTP extensions after STARTTLS without a new EHLO, in contravention of the
1751 10. Logging of TCP/IP connections (when configured) now happens in the main
1752 daemon process instead of the child process, so that the TCP/IP connection
1753 count is more accurate (but it can never be perfect).
1755 11. The use of "drop" in a nested ACL was not being handled correctly in the
1756 outer ACL. Now, if condition failure induced by the nested "drop" causes
1757 the outer ACL verb to deny access ("accept" or "discard" after "endpass",
1758 or "require"), the connection is dropped.
1760 12. Similarly, "discard" in a nested ACL wasn't being handled. A nested ACL
1761 that yield "discard" can now be used with an "accept" or a "discard" verb,
1762 but an error is generated for any others (because I can't see a useful way
1763 to define what should happen).
1765 13. When an ACL is read dynamically from a file (or anywhere else), the lines
1766 are now processed in the same way as lines in the Exim configuration file.
1767 In particular, continuation lines are supported.
1769 14. Added the "dnslists = a.b.c!=n.n.n.n" feature.
1771 15. Added -ti meaning -t -i.
1773 16. Check for letters, digits, hyphens, and dots in the names of dnslist
1774 domains, and warn by logging if others are found.
1776 17. At least on BSD, alignment is not guarenteed for the array of ifreq's
1777 returned from GIFCONF when Exim is trying to find the list of interfaces on
1778 a host. The code in os.c has been modified to copy each ifreq to an aligned
1779 structure in all cases.
1781 Also, in some cases, the returned ifreq's were being copied to a 'struct
1782 ifreq' on the stack, which was subsequently passed to host_ntoa(). That
1783 means the last couple of bytes of an IPv6 address could be chopped if the
1784 ifreq contained only a normal sockaddr (14 bytes storage).
1786 18. Named domain lists were not supported in the hosts_treat_as_local option.
1787 An entry such as +xxxx was not recognized, and was treated as a literal
1790 19. Ensure that header lines added by a DATA ACL are included in the reject log
1791 if the ACL subsequently rejects the message.
1793 20. Upgrade the cramtest.pl utility script to use Digest::MD5 instead of just
1794 MD5 (which is deprecated).
1796 21. When testing a filter file using -bf, Exim was writing a message when it
1797 took the sender from a "From " line in the message, but it was not doing so
1798 when it took $return_path from a Return-Path: header line. It now does.
1800 22. If the contents of a "message" modifier for a "warn" ACL verb do not begin
1801 with a valid header line field name (a series of printing characters
1802 terminated by a colon, Exim now inserts X-ACL-Warn: at the beginning.
1804 23. Changed "disc" in the source to "disk" to conform to the documentation and
1805 the book and for uniformity.
1807 24. Ignore Sendmail's -Ooption=value command line item.
1809 25. When execve() failed while trying to run a command in a pipe transport,
1810 Exim was returning EX_UNAVAILBLE (69) from the subprocess. However, this
1811 could be confused with a return value of 69 from the command itself. This
1812 has been changed to 127, the value the shell returns if it is asked to run
1813 a non-existent command. The wording for the related log line suggests a
1814 non-existent command as the problem.
1816 26. If received_header_text expands to an empty string, do not add a Received:
1817 header line to the message. (Well, it adds a token one on the spool, but
1818 marks it "old" so that it doesn't get used or transmitted.)
1820 27. Installed eximstats 1.28 (addition of -nt option).
1822 28. There was no check for failure on the call to getsockname() in the daemon
1823 code. This can fail if there is a shortage of resources on the system, with
1824 ENOMEM, for example. A temporary error is now given on failure.
1826 29. Contrary to the C standard, it seems that in some environments, the
1827 equivalent of setlocale(LC_ALL, "C") is not obeyed at the start of a C
1828 program. Exim now does this explicitly; it affects the formatting of
1829 timestamps using strftime().
1831 30. If exiqsumm was given junk data, it threw up some uninitialized variable
1832 complaints. I've now initialized all the variables, to avoid this.
1834 32. Header lines added by a system filter were not being "seen" during
1835 transport-time rewrites.
1837 33. The info_callback() function passed to OpenSSL is set up with type void
1838 (*)(SSL *, int, int), as described somewhere. However, when calling the
1839 function (actually a macro) that sets it up, the type void(*)() is
1840 expected. I've put in a cast to prevent warnings from picky compilers.
1842 34. If a DNS black list lookup found a CNAME record, but there were no A
1843 records associated with the domain it pointed at, Exim crashed.
1845 35. If a DNS black list lookup returned more than one A record, Exim ignored
1846 all but the first. It now scans all returned addresses if a particular IP
1847 value is being sought. In this situation, the contents of the
1848 $dnslist_value variable are a list of all the addresses, separated by a
1851 36. Tightened up the rules for host name lookups using reverse DNS. Exim used
1852 to accept a host name and all its aliases if the forward lookup for any of
1853 them yielded the IP address of the incoming connection. Now it accepts only
1854 those names whose forward lookup yields the correct IP address. Any other
1855 names are discarded. This closes a loophole whereby a rogue DNS
1856 administrator could create reverse DNS records to break through a
1857 wildcarded host restriction in an ACL.
1859 37. If a user filter or a system filter that ran in a subprocess used any of
1860 the numerical variables ($1, $2 etc), or $thisaddress, in a pipe command,
1861 the wrong values were passed to the pipe command ($thisaddress had the
1862 value of $0, $0 had the value of $1, etc). This bug was introduced by
1863 change 4.11/101, and not discovered because I wrote an inadequate test. :-(
1865 38. Improved the line breaking for long SMTP error messages from ACLs.
1866 Previously, if there was no break point between 40 and 75 characters, Exim
1867 left the rest of the message alone. Two changes have been made: (a) I've
1868 reduced the minimum length to 35 characters; (b) if it can't find a break
1869 point between 35 and 75 characters, it looks ahead and uses the first one
1870 that it finds. This may give the occasional overlong line, but at least the
1871 remaining text gets split now.
1873 39. Change 82 of 4.11 was unimaginative. It assumed the limit on the number of
1874 file descriptors might be low, and that setting 1000 would always raise it.
1875 It turns out that in some environments, the limit is already over 1000 and
1876 that lowering it causes trouble. So now Exim takes care not to decrease it.
1878 40. When delivering a message, the value of $return_path is set to $sender_
1879 address at the start of routing (routers may change the value). By an
1880 oversight, this default was not being set up when an address was tested by
1881 -bt or -bv, which affected the outcome if any router or filter referred to
1884 41. The idea of the "warn" ACL verb is that it adds a header or writes to the
1885 log only when "message" or "log_message" are set. However, if one of the
1886 conditions was an address verification, or a call to a nested ACL, the
1887 messages generated by the underlying test were being passed through. This
1888 no longer happens. The underlying message is available in $acl_verify_
1889 message for both "message" and "log_message" expansions, so it can be
1890 passed through if needed.
1892 42. Added RFC 2047 interpretation of header lines for $h_ expansions, with a
1893 new expansion $bh_ to give the encoded byte string without charset
1894 translation. Translation happens only if iconv() is available; HAVE_ICONV
1895 indicates this at build time. HEADERS_CHARSET gives the charset to
1896 translate to; headers_charset can change it in the configuration, and
1897 "headers charset" can change it in an individual filter file.
1899 43. Now that we have a default RFC 2047 charset (see above), the code in Exim
1900 that creates RFC 2047 encoded "words" labels them as that charset instead
1901 of always using iso-8859-1. The cases are (i) the explicit ${rfc2047:
1902 expansion operator; (ii) when Exim creates a From: line for a local
1903 message; (iii) when a header line is rewritten to include a "phrase" part.
1905 44. Nasty bug in exiqsumm: the regex to skip already-delivered addresses was
1906 buggy, causing it to skip the first lines of messages whose message ID
1907 ended in 'D'. This would not have bitten before Exim release 4.14, because
1908 message IDs were unlikely to end in 'D' before then. The effect was to have
1909 incorrect size information for certain domains.
1911 45. #include "config.h" was missing at the start of the crypt16.c module. This
1912 caused trouble on Tru64 (aka OSF1) systems, because HAVE_CRYPT16 was not
1915 46. If there was a timeout during a "random" callout check, Exim treated it as
1916 a failure of the random address, and carried on sending RSET and the real
1917 address. If the delay was just some slowness somewhere, the response to the
1918 original RCPT would be taken as a response to RSET and so on, causing
1919 mayhem of various kinds.
1921 47. Change 50 for 4.20 was a heap of junk. I don't know what I was thinking
1922 when I implemented it. It didn't allow for the fact that some option values
1923 may legitimatetly be negative (e.g. size_addition), and it didn't even do
1924 the right test for positive values.
1926 48. Domain names in DNS records are case-independent. Exim always looks them up
1927 in lower case. Some resolvers return domain names in exactly the case they
1928 appear in the zone file, that is, they may contain uppercase letters. Not
1929 all resolvers do this - some return always lower case. Exim was treating a
1930 change of case by a resolver as a change of domain, similar to a widening
1931 of a domain abbreviation. This triggered its re-routing code and so it was
1932 trying to route what was effectively the same domain again. This normally
1933 caused routing to fail (because the router wouldn't handle the domain
1934 twice). Now Exim checks for this case specially, and just changes the
1935 casing of the domain that it ultimately uses when it transmits the message
1938 49. Added Sieve (RFC 3028) support, courtesy of Michael Haardt's contributed
1941 50. If a filter generated a file delivery with a non-absolute name (possible if
1942 no home directory exists for the router), the forbid_file option was not
1945 51. Added '&' feature to dnslists, to provide bit mask matching in addition to
1946 the existing equality matching.
1948 52. Exim was using ints instead of ino_t variables in some places where it was
1949 dealing with inode numbers.
1951 53. If TMPDIR is defined in Local/Makefile (default in src/EDITME is
1952 TMPDIR="/tmp"), Exim checks for the presence of an environment variable
1953 called TMPDIR, and if it finds it is different, it changes its value.
1955 54. The smtp_printf() function is now made available to local_scan() so
1956 additional output lines can be written before returning. There is also an
1957 smtp_fflush() function to enable the detection of a dropped connection.
1958 The variables smtp_input and smtp_batched_input are exported to
1961 55. Changed the default runtime configuration: the message "Unknown user"
1962 has been removed from the ACL, and instead placed on the localuser router,
1963 using the cannot_route_message feature. This means that any verification
1964 failures that generate their own messages won't get overridden. Similarly,
1965 the "Unrouteable address" message that was in the ACL for unverifiable
1966 relay addresses has also been removed.
1968 56. Added hosts_avoid_esmtp to the smtp transport.
1970 57. The exicyclog script was not checking for the esoteric option
1971 CONFIGURE_FILE_USE_EUID in the Local/Makefile. It now does this, but it
1972 will work only if exicyclog is run under the appropriate euid.
1974 58. Following a discussion on the list, the rules by which Exim recognises line
1975 endings on incoming messages have been changed. The -dropcr and drop_cr
1976 options are now no-ops, retained only for backwards compatibility. The
1977 following line terminators are recognized: LF CRLF CR. However, special
1978 processing applies to CR:
1980 (i) The sequence CR . CR does *not* terminate an incoming SMTP message,
1981 nor a local message in the state where . is a terminator.
1983 (ii) If a bare CR is encountered in a header line, an extra space is added
1984 after the line terminator so as not to end the header. The reasoning
1985 behind this is that bare CRs in header lines are most likely either
1986 to be mistakes, or people trying to play silly games.
1988 59. The size of a message, as listed by "-bp" or in the Exim monitor window,
1989 was being incorrectly given as 18 bytes larger than it should have been.
1990 This is a VOB (very old bug).
1992 60. This may never have affected anything current, but just in case it has:
1993 When the local host is found other than at the start of a list of hosts,
1994 the local host, those with the same MX, and any that follow, are discarded.
1995 When the list in question was part of a longer list of hosts, the following
1996 hosts (not currently being processed) were also being discarded. This no
1997 longer happens. I'm not sure if this situation could ever has previously
2000 61. Added the "/MX" feature to lists of hosts in the manualroute and query
2003 62. Whenever Exim generates a new message, it now adds an Auto-Submitted:
2004 header. This is something that is recommended in a new Internet Draft, and
2005 is something that is documented as being done by Sendmail. There are two
2006 possible values. For messages generated by the autoreply transport, Exim
2009 Auto-Submitted: auto-replied
2011 whereas for all other generated messages (e.g. bounces) it adds
2013 Auto-Submitted: auto-generated
2015 63. The "personal" condition in filters now includes a test for the
2016 Auto-Submitted: header. If it contains the string "auto-" the message it
2017 not considered personal.
2019 64. Added rcpt_include_affixes as a generic transport option.
2021 65. Added queue_only_override (default true).
2023 66. Added the syslog_duplication option.
2025 67. If what should have been the first header line of a message consisted of
2026 a space followed by a colon, Exim was mis-interpreting it as a header line.
2027 It isn't of course - it is syntactically invalid and should therefore be
2028 treated as the start of the message body. The misbehaviour could have
2029 caused a number of strange effects, including loss of data in subsequent
2030 header lines, and spool format errors.
2032 68. Formerly, the AUTH parameter on a MAIL command was trusted only if the
2033 client host had authenticated. This control can now be exercised by an ACL
2034 for more flexibility.
2036 69. By default, callouts do not happen when testing with -bh. There is now a
2037 variant, -bhc, which does actually run the callout code, including
2038 consulting and updating the callout cache.
2040 70. Added support for saslauthd authentication, courtesy of Alexander
2043 71. If statvfs() failed on the spool or log directories while checking their
2044 size for availability, Exim confusingly gave the error "space shortage".
2045 Furthermore, in debugging mode it crashed with a floating point exception.
2046 These checks are done if check_{spool,log}_{space,inodes} are set, and when
2047 an SMTP message arrives with SIZE= on the MAIL command. As this is a really
2048 serious problem, Exim now writes to the main and panic logs when this
2049 happens, with details of the failure. It then refuses to accept the
2050 incoming message, giving the message "spool directory problem" or "log
2051 directory problem" with a 421 code for SMTP messages.
2053 72. When Exim is about to re-exec itself, it ensures that the file descriptors
2054 0, 1, and 2 exist, because some OS complain for execs without them (see
2055 ChangeLog 4.05/30). If necessary, Exim opens /dev/null to use for these
2056 descriptors. However, the code omitted to check that the open succeeded,
2057 causing mysterious errors if for some reason the permissions on /dev/null
2058 got screwed. Now Exim writes a message to the main and panic logs, and
2059 bombs out if it can't open /dev/null.
2061 73. Re-vamped the way daemon_smtp_port, local_interfaces, and -oX work and
2062 interact so that it is all more flexible. It is supposed to remain
2063 backwards compatible. Also added extra_local_interfaces.
2065 74. Invalid data sent to a SPA (NTLM) server authenticator could cause the code
2066 to bomb out with an assertion failure - to the client this appears as a
2067 connection drop. This problem occurs in the part of the code that was taken
2068 from the Samba project. Fortunately, the assertion is in a very simple
2069 function, so I have fixed this by reproducing the function inline in the
2070 one place where it is called, and arranging for authentication to fail
2071 instead of killing the process with assert().
2073 75. The SPA client code was not working when the server requested OEM rather
2074 than Unicode encoding.
2076 76. Added code to make require_files with a specific uid setting more usable in
2077 the case where statting the file as root fails - usually a non-root-mounted
2078 NFS file system. When this happens and the failure is EACCES, Exim now
2079 forks a subprocess and does the per-uid checking as the relevant uid.
2081 77. Added process_log_path.
2083 78. If log_file_path was not explicitly set, a setting of check_log_space or
2084 check_log_inodes was ignored.
2086 79. If a space check for the spool or log partitions fails, the incident is now
2087 logged. Of course, in the latter case the data may get lost...
2089 80. Added the %p formatting code to string_format() so that it can be used to
2090 print addresses in debug_print(). Adjusted all the address printing in the
2091 debugging in store.c to use %p rather than %d.
2093 81. There was a concern that a line of code in smtp_in.c could overflow a
2094 buffer if a HELO/EHLO command was given followed by 500 or so spaces. As
2095 initially expressed, the concern was not well-founded, because trailing
2096 spaces are removed early. However, if the trailing spaces were followed by
2097 a NULL, they did not get removed, so the overflow was possible. Two fixes
2100 (a) I re-wrote the offending code in a cleaner fashion.
2101 (b) If an incoming SMTP command contains a NULL character, it is rejected
2104 82. When Exim changes uid/gid to the Exim user at daemon start time, it now
2105 runs initgroups(), so that if the Exim user is in any additional groups,
2106 they will be used during message reception.
2112 The change log for 4.20 and earlier releases has been archived.
git://git.exim.org / users / heiko / exim.git / blob