1 $Cambridge: exim/doc/doc-txt/ChangeLog,v 1.95 2005/03/22 14:50:10 ph10 Exp $
3 Change log file for Exim from version 4.21
4 -------------------------------------------
10 TK/01 Added Yahoo DomainKeys support via libdomainkeys. See
11 doc/experimental-spec.txt for details. (http://domainkeys.sf.net)
13 TK/02 Fix ACL "control" statment not being available in MIME ACL.
15 TK/03 Fix ACL "regex" condition not being available in MIME ACL.
17 PH/01 Installed a patch from the Sieve maintainer that allows -bf to be used
18 to test Sieve filters that use "vacation".
20 PH/02 Installed a slightly modified version of Nikos Mavrogiannopoulos' patch
21 that changes the way the GnuTLS parameters are stored in the cache file.
22 The new format can be generated externally. For backward compatibility,
23 if the data in the cache doesn't make sense, Exim assumes it has read an
24 old-format file, and it generates new data and writes a new file. This
25 means that you can't go back to an older release without removing the
28 PH/03 A redirect router that has both "unseen" and "one_time" set does not
29 work if there are any delivery delays because "one_time" forces the
30 parent to be marked "delivered", so its unseen clone is never tried
31 again. For this reason, Exim now forbids the simultaneous setting of
34 PH/04 Change 4.11/85 fixed an obscure bug concerned with addresses that are
35 redirected to themselves ("homonym" addresses). Read the long ChangeLog
36 entry if you want to know the details. The fix, however, neglected to
37 consider the case when local delivery batching is involved. The test for
38 "previously delivered" was not happening when checking to see if an
39 address could be batched with a previous (undelivered) one; under
40 certain circumstances this could lead to multiple deliveries to the same
41 address. A one-line patch to add the appropriate test fixes the bug.
43 PH/05 Renamed the macro SOCKLEN_T as EXIM_SOCKLEN_T because AIX uses SOCKLEN_T
44 in its include files, and this causes problems building Exim.
46 PH/06 A number of "verify =" ACL conditions have no options (e.g. verify =
47 header_syntax) but Exim was just ignoring anything given after a slash.
48 In particular, this caused confusion with an attempt to use "verify =
49 reverse_host_lookup/defer_ok". An error is now given when options are
50 supplied for verify items that do not have them. (Maybe reverse_host_
51 lookup should have a defer_ok option, but that's a different point.)
53 PH/07 Increase the size of the buffer for incoming SMTP commands from 512 (as
54 defined by RFC 821) to 2048, because there were problems with some AUTH
55 commands, and RFC 1869 says the size should be increased for extended
56 SMTP commands that take arguments.
58 PH/08 Added ${dlfunc dynamically loaded function for expansion (code from Tony
61 PH/09 Previously, an attempt to use ${perl when it wasn't compiled gave an
62 "unknown" error; now it says that the functionality isn't in the binary.
64 PH/10 Added a nasty fudge to try to recognize and flatten LDAP passwords in
65 an address' error message when a string expansion fails (syntax or
66 whatever). Otherwise not only does the password appear in the log, it may
67 also be put in a bounce message.
70 A note about Exim versions 4.44 and 4.50
71 ----------------------------------------
73 Exim 4.50 was meant to be the next release after 4.43. It contains a lot of
74 changes of various kinds. As a consequence, a big documentation update was
75 needed. This delayed the release for rather longer than seemed good, especially
76 in the light of a couple of (minor) security issues. Therefore, the changes
77 that fixed bugs were backported into 4.43, to create a 4.44 maintenance
78 release. So 4.44 and 4.50 are in effect two different branches that both start
81 I have left the 4.50 change log unchanged; it contains all the changes since
82 4.43. The change log for 4.44 is below; many of its items are identical to
83 those for 4.50. This seems to be the most sensible way to preserve the
84 historical information.
90 1. Minor wording change to the doc/README.SIEVE file.
92 2. Change 4.43/35 introduced a bug: if quota_filecount was set, the
93 computation of the current number of files was incorrect.
95 3. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
96 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
99 4. Give more explanation in the error message when the command for a transport
100 filter fails to execute.
102 5. There are several places where Exim runs a non-Exim command in a
103 subprocess. The SIGUSR1 signal should be disabled for these processes. This
104 was being done only for the command run by the queryprogram router. It is
105 now done for all such subprocesses. The other cases are: ${run, transport
106 filters, and the commands run by the lmtp and pipe transports.
108 6. Added CONFIGURE_GROUP build-time option.
110 7. Some older OS have a limit of 256 on the maximum number of file
111 descriptors. Exim was using setrlimit() to set 1000 as a large value
112 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
113 systems. I've change it so that if it can't get 1000, it tries for 256.
115 8. "control=submission" was allowed, but had no effect, in a DATA ACL. This
116 was an oversight, and furthermore, ever since the addition of extra
117 controls (e.g. 4.43/32), the checks on when to allow different forms of
118 "control" were broken. There should now be diagnostics for all cases when a
119 control that does not make sense is encountered.
121 9. Added the /retain_sender option to "control=submission".
123 10. $recipients is now available in the predata ACL (oversight).
125 11. Tidy the search cache before the fork to do a delivery from a message
126 received from the command line. Otherwise the child will trigger a lookup
127 failure and thereby defer the delivery if it tries to use (for example) a
128 cached ldap connection that the parent has called unbind on.
130 12. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
131 of $address_data from the recipient verification was clobbered by the
134 13. The value of address_data from a sender verification is now available in
135 $sender_address_data in subsequent conditions in the ACL statement.
137 14. Added forbid_sieve_filter and forbid_exim_filter to the redirect router.
139 15. Added a new option "connect=<time>" to callout options, to set a different
142 16. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
143 was its contents. (It was OK if the option was not defined at all.)
145 17. A "Completed" log line is now written for messages that are removed from
146 the spool by the -Mrm option.
148 18. New variables $sender_verify_failure and $recipient_verify_failure contain
149 information about exactly what failed.
151 19. Added -dd to debug only the daemon process.
153 20. Incorporated Michael Haardt's patch to ldap.c for improving the way it
154 handles timeouts, both on the server side and network timeouts. Renamed the
155 CONNECT parameter as NETTIMEOUT (but kept the old name for compatibility).
157 21. The rare case of EHLO->STARTTLS->HELO was setting the protocol to "smtp".
158 It is now set to "smtps".
160 22. $host_address is now set to the target address during the checking of
163 23. When checking ignore_target_hosts for an ipliteral router, no host name was
164 being passed; this would have caused $sender_host_name to have been used if
165 matching the list had actually called for a host name (not very likely,
166 since this list is usually IP addresses). A host name is now passed as
169 24. Changed the calls that set up the SIGCHLD handler in the daemon to use the
170 code that specifies a non-restarting handler (typically sigaction() in
171 modern systems) in an attempt to fix a rare and obscure crash bug.
173 25. Narrowed the window for a race in the daemon that could cause it to ignore
174 SIGCHLD signals. This is not a major problem, because they are used only to
175 wake it up if nothing else does.
177 26. A malformed maildirsize file could cause Exim to calculate negative values
178 for the mailbox size or file count. Odd effects could occur as a result.
179 The maildirsize information is now recalculated if the size or filecount
182 27. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
183 support for a long time. Removed HAVE_SYS_VFS_H.
185 28. Installed the latest version of exipick from John Jetmore.
187 29. In an address list, if the pattern was not a regular expression, an empty
188 subject address (from a bounce message) matched only if the pattern was an
189 empty string. Non-empty patterns were not even tested. This was the wrong
190 because it is perfectly reasonable to use an empty address as part of a
191 database query. An empty address is now tested by patterns that are
192 lookups. However, all the other forms of pattern expect the subject to
193 contain a local part and a domain, and therefore, for them, an empty
194 address still always fails if the pattern is not itself empty.
196 30. Exim went into a mad DNS loop when attempting to do a callout where the
197 host was specified on an smtp transport, and looking it up yielded more
200 31. Re-factored the code for checking spool and log partition space into a
201 function that finds that data and another that does the check. The former
202 is then used to implement four new variables: $spool_space, $log_space,
203 $spool_inodes, and $log_inodes.
205 32. The RFC2047 encoding function was originally intended for short strings
206 such as real names; it was not keeping to the 75-character limit for
207 encoded words that the RFC imposes. It now respects the limit, and
208 generates multiple encoded words if necessary. To be on the safe side, I
209 have increased the buffer size for the ${rfc2047: expansion operator from
212 33. It is now permitted to omit both strings after an "if" condition; if the
213 condition is true, the result is "true". As before, when the second string
214 is omitted, a false condition yields an empty string. This makes it less
215 cumbersome to write custom ACL and router conditions.
217 34. Failure to deliver a bounce message always caused it to be frozen, even if
218 there was an errors_to setting on the router. The errors_to setting is now
221 35. If an IPv6 address is given for -bh or -bhc, it is now converted to the
222 canonical form (fully expanded) before being placed in
223 $sender_host_address.
225 36. The table in the code that translates DNS record types into text (T_A to
226 "A" for instance) was missing entries for NS and CNAME. It is just possible
227 that this could have caused confusion if both these types were looked up
228 for the same domain, because the text type is used as part of Exim's
229 per-process caching. But the chance of anyone hitting this buglet seems
232 37. The dnsdb lookup has been extended in a number of ways.
234 (1) There is a new type, "zns", which walks up the domain tree until it
235 finds some nameserver records. It should be used with care.
237 (2) There is a new type, "mxh", which is like "mx" except that it returns
238 just the host names, not the priorities.
240 (3) It is now possible to give a list of domains (or IP addresses) to be
241 looked up. The behaviour when one of the lookups defers can be
242 controlled by a keyword.
244 (4) It is now possible to specify the separator character for use when
245 multiple records are returned.
247 38. The dnslists ACL condition has been extended: it is now possible to supply
248 a list of IP addresses and/or domains to be looked up in a particular DNS
251 39. Added log_selector=+queue_time_overall.
253 40. When running the queue in the test harness, wait just a tad after forking a
254 delivery process, to get repeatability of debugging output.
256 41. Include certificate and key file names in error message when GnuTLS fails
257 to set them up, because the GnuTLS error message doesn't include the name
258 of the failing file when there is a problem reading it.
260 42. Allow both -bf and -bF in the same test run.
262 43. Did the same fix as 41 above for OpenSSL, which had the same infelicity.
264 44. The "Exiscan patch" is now merged into the mainline Exim source.
266 45. Sometimes the final signoff response after QUIT could fail to get
267 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
268 < 0 before doing a fflush(). This bug looks as though it goes back to the
269 introduction of TLS in release 3.20, but "sometimes" must have been rare
270 because the tests only now provoked it.
272 46. Reset the locale to "C" after calling embedded Perl, in case it was changed
273 (this can affect the format of dates).
275 47. exim_tidydb, when checking for the continued existence of a message for
276 which it has found a message-specific retry record, was not finding
277 messages that were in split spool directories. Consequently, it was
278 deleting retry records that should have stayed in existence.
280 48. Steve fixed some bugs in eximstats.
282 49. The SPA authentication driver was not abandoning authentication and moving
283 on to the next authenticator when an expansion was forced to fail,
284 contradicting the general specification for all authenticators. Instead it
285 was generating a temporary error. It now behaves as specified.
287 50. The default ordering of permitted cipher suites for GnuTLS was pessimal
288 (the order specifies the preference for clients). The order is now AES256,
289 AES128, 3DES, ARCFOUR128.
291 51. Small patch to Sieve code - explicitly set From: when generating an
294 52. Exim crashed if a remote delivery caused a very long error message to be
295 recorded - for instance if somebody sent an entire SpamAssassin report back
296 as a large number of 550 error lines. This bug was coincidentally fixed by
297 increasing the size of one of Exim's internal buffers (big_buffer) that
298 happened as part of the Exiscan merge. However, to be on the safe side, I
299 have made the code more robust (and fixed the comments that describe what
302 53. Now that there can be additional text after "Completed" in log lines (if
303 the queue_time_overall log selector is set), a one-byte patch to exigrep
304 was needed to allow it to recognize "Completed" as not the last thing in
307 54. The LDAP lookup was not handling a return of LDAP_RES_SEARCH_REFERENCE. A
308 patch that reportedly fixes this has been added. I am not expert enough to
309 create a test for it. This is what the patch creator wrote:
311 "I found a little strange behaviour of ldap code when working with
312 Windows 2003 AD Domain, where users was placed in more than one
313 Organization Units. When I tried to give exim partial DN, the exit code
314 of ldap_search was unknown to exim because of LDAP_RES_SEARCH_REFERENCE.
315 But simultaneously result of request was absolutely normal ldap result,
316 so I produce this patch..."
318 Later: it seems that not all versions of LDAP support LDAP_RES_SEARCH_
319 REFERENCE, so I have modified the code to exclude the patch when that macro
322 55. Some experimental protocols are using DNS PTR records for new purposes. The
323 keys for these records are domain names, not reversed IP addresses. The
324 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
325 leaves it alone. Component reversal etc. now happens only for IP addresses.
328 56. Improve error message when ldap_search() fails in OpenLDAP or Solaris LDAP.
330 57. Double the size of the debug message buffer (to 2048) so that more of very
331 long debug lines gets shown.
333 58. The exicyclog utility now does better if the number of log files to keep
334 exceeds 99. In this case, it numbers them 001, 002 ... instead of 01, 02...
336 59. Two changes related to the smtp_active_hostname option:
338 (1) $smtp_active_hostname is now available as a variable.
339 (2) The default for smtp_banner uses $smtp_active_hostname instead
340 of $primary_hostname.
342 60. The host_aton() function is supposed to be passed a string that is known
343 to be a valid IP address. However, in the case of IPv6 addresses, it was
344 not checking this. This is a hostage to fortune. Exim now panics and dies
345 if the condition is not met. A case was found where this could be provoked
346 from a dnsdb PTR lookup with an IPv6 address that had more than 8
347 components; fortuitously, this particular loophole had already been fixed
348 by change 4.50/55 above.
350 If there are any other similar loopholes, the new check in host_aton()
351 itself should stop them being exploited. The report I received stated that
352 data on the command line could provoke the exploit when Exim was running as
353 exim, but did not say which command line option was involved. All I could
354 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
358 61. There was a buffer overflow vulnerability in the SPA authentication code
359 (which came originally from the Samba project). I have added a test to the
360 spa_base64_to_bits() function which I hope fixes it.
363 62. Configuration update for GNU/Hurd and variations. Updated Makefile-GNU and
364 os.h-GNU, and added configuration files for GNUkFreeBSD and GNUkNetBSD.
366 63. The daemon start-up calls getloadavg() while still root for those OS that
367 need the first call to be done as root, but it missed one case: when
368 deliver_queue_load_max is set with deliver_drop_privilege. This is
369 necessary for the benefit of the queue runner, because there is no re-exec
370 when deliver_drop_privilege is set.
372 64. A call to exiwhat cut short delays set up by "delay" modifiers in ACLs.
375 65. Caching of lookup data for "hosts =" ACL conditions, when a named host list
376 was in use, was not putting the data itself into the right store pool;
377 consequently, it could be overwritten for a subsequent message in the same
378 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
381 66. Added hosts_max_try_hardlimit to the smtp transport, default 50.
383 67. The string_is_ip_address() function returns 0, 4, or 6, for "no an IP
384 address", "IPv4 address", and "IPv6 address", respectively. Some calls of
385 the function were treating the return as a boolean value, which happened to
386 work because 0=false and not-0=true, but is not correct code.
388 68. The host_aton() function was not handling scoped IPv6 addresses (those
389 with, for example, "%eth0" on the end) correctly.
391 69. Fixed some compiler warnings in acl.c for the bitmaps specified with
392 negated items (that is, ~something) in unsigned ints. Some compilers
393 apparently mutter when there is no cast.
395 70. If an address verification called from an ACL failed, and did not produce a
396 user-specific message (i.e. there was only a "system" message), nothing was
397 put in $acl_verify_message. In this situation, it now puts the system
400 71. Change 4.23/11 added synchronization checking at the start of an SMTP
401 session; change 4.31/43 added the unwanted input to the log line - except
402 that it did not do this in the start of session case. It now does.
404 72. After a timeout in a callout SMTP session, Exim still sent a QUIT command.
405 This is wrong and can cause the other end to generate a synchronization
406 error if it is another Exim or anything else that does the synchronization
407 check. A QUIT command is no longer sent after a timeout.
409 73. $host_lookup_deferred has been added, to make it easier to detect DEFERs
412 74. The defer_ok option of callout verification was not working if it was used
413 when verifying addresses in header lines, that is, for this case:
415 verify = header_sender/callout=defer_ok
417 75. A backgrounded daemon closed stdin/stdout/stderr on entry; this meant that
418 those file descriptors could be used for SMTP connections. If anything
419 wrote to stderr (the example that came up was "warn" in embedded Perl), it
420 could be sent to the SMTP client, causing chaos. The daemon now opens
421 stdin, stdout, and stderr to /dev/null when it puts itself into the
424 76. Arrange for output from Perl's "warn" command to be written to Exim's main
425 log by default. The user can override this with suitable Perl magic.
427 77. The use of log_message on a "discard" ACL verb, which is supposed to add to
428 the log message when discard triggers, was not working for the DATA ACL or
429 for the non-SMTP ACL.
431 78. Error message wording change in sieve.c.
433 79. If smtp_accept_max_per_host was set, the number of connections could be
434 restricted to fewer than expected, because the daemon was trying to set up
435 a new connection before checking whether the processes handling previous
436 connections had finished. The check for completed processes is now done
437 earlier. On busy systems, this bug wouldn't be noticed because something
438 else would have woken the daemon, and it would have reaped the completed
441 80. If a message was submitted locally by a user whose login name contained one
442 or more spaces (ugh!), the spool file that Exim wrote was not re-readable.
443 It caused a spool format error. I have fixed the spool reading code. A
444 related problem was that the "from" clause in the Received: line became
445 illegal because of the space(s). It is now covered by ${quote_local_part.
447 81. Included the latest eximstats from Steve (adds average sizes to HTML Top
450 82. Updated OS/Makefile-AIX as per message from Mike Meredith.
452 83. Patch from Sieve maintainer to fix unterminated string problem in
455 84. Some minor changes to the Linux configuration files to help with other
456 OS variants using glibc.
458 85. One more patch for Sieve to update vacation handling to latest spec.
461 ----------------------------------------------------
462 See the note above about the 4.44 and 4.50 releases.
463 ----------------------------------------------------
469 1. Change 4.43/35 introduced a bug that caused file counts to be
470 incorrectly computed when quota_filecount was set in an appendfile
473 2. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
474 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
477 3. Give more explanation in the error message when the command for a transport
478 filter fails to execute.
480 4. There are several places where Exim runs a non-Exim command in a
481 subprocess. The SIGUSR1 signal should be disabled for these processes. This
482 was being done only for the command run by the queryprogram router. It is
483 now done for all such subprocesses. The other cases are: ${run, transport
484 filters, and the commands run by the lmtp and pipe transports.
486 5. Some older OS have a limit of 256 on the maximum number of file
487 descriptors. Exim was using setrlimit() to set 1000 as a large value
488 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
489 systems. I've change it so that if it can't get 1000, it tries for 256.
491 6. "control=submission" was allowed, but had no effect, in a DATA ACL. This
492 was an oversight, and furthermore, ever since the addition of extra
493 controls (e.g. 4.43/32), the checks on when to allow different forms of
494 "control" were broken. There should now be diagnostics for all cases when a
495 control that does not make sense is encountered.
497 7. $recipients is now available in the predata ACL (oversight).
499 8. Tidy the search cache before the fork to do a delivery from a message
500 received from the command line. Otherwise the child will trigger a lookup
501 failure and thereby defer the delivery if it tries to use (for example) a
502 cached ldap connection that the parent has called unbind on.
504 9. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
505 of $address_data from the recipient verification was clobbered by the
508 10. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
509 was its contents. (It was OK if the option was not defined at all.)
511 11. A "Completed" log line is now written for messages that are removed from
512 the spool by the -Mrm option.
514 12. $host_address is now set to the target address during the checking of
517 13. When checking ignore_target_hosts for an ipliteral router, no host name was
518 being passed; this would have caused $sender_host_name to have been used if
519 matching the list had actually called for a host name (not very likely,
520 since this list is usually IP addresses). A host name is now passed as
523 14. Changed the calls that set up the SIGCHLD handler in the daemon to use the
524 code that specifies a non-restarting handler (typically sigaction() in
525 modern systems) in an attempt to fix a rare and obscure crash bug.
527 15. Narrowed the window for a race in the daemon that could cause it to ignore
528 SIGCHLD signals. This is not a major problem, because they are used only to
529 wake it up if nothing else does.
531 16. A malformed maildirsize file could cause Exim to calculate negative values
532 for the mailbox size or file count. Odd effects could occur as a result.
533 The maildirsize information is now recalculated if the size or filecount
536 17. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
537 support for a long time. Removed HAVE_SYS_VFS_H.
539 18. Updated exipick to current release from John Jetmore.
541 19. Allow an empty sender to be matched against a lookup in an address list.
542 Previously the only cases considered were a regular expression, or an
545 20. Exim went into a mad DNS lookup loop when doing a callout where the
546 host was specified on the transport, if the DNS lookup yielded more than
549 21. The RFC2047 encoding function was originally intended for short strings
550 such as real names; it was not keeping to the 75-character limit for
551 encoded words that the RFC imposes. It now respects the limit, and
552 generates multiple encoded words if necessary. To be on the safe side, I
553 have increased the buffer size for the ${rfc2047: expansion operator from
556 22. Failure to deliver a bounce message always caused it to be frozen, even if
557 there was an errors_to setting on the router. The errors_to setting is now
560 23. If an IPv6 address is given for -bh or -bhc, it is now converted to the
561 canonical form (fully expanded) before being placed in
562 $sender_host_address.
564 24. Updated eximstats to version 1.33
566 25. Include certificate and key file names in error message when GnuTLS fails
567 to set them up, because the GnuTLS error message doesn't include the name
568 of the failing file when there is a problem reading it.
570 26. Expand error message when OpenSSL has problems setting up cert/key files.
573 27. Reset the locale to "C" after calling embedded Perl, in case it was changed
574 (this can affect the format of dates).
576 28. exim_tidydb, when checking for the continued existence of a message for
577 which it has found a message-specific retry record, was not finding
578 messages that were in split spool directories. Consequently, it was
579 deleting retry records that should have stayed in existence.
581 29. eximstats updated to version 1.35
582 1.34 - allow eximstats to parse syslog lines as well as mainlog lines
583 1.35 - bugfix such that pie charts by volume are generated correctly
585 30. The SPA authentication driver was not abandoning authentication and moving
586 on to the next authenticator when an expansion was forced to fail,
587 contradicting the general specification for all authenticators. Instead it
588 was generating a temporary error. It now behaves as specified.
590 31. The default ordering of permitted cipher suites for GnuTLS was pessimal
591 (the order specifies the preference for clients). The order is now AES256,
592 AES128, 3DES, ARCFOUR128.
594 31. Small patch to Sieve code - explicitly set From: when generating an
597 32. Exim crashed if a remote delivery caused a very long error message to be
598 recorded - for instance if somebody sent an entire SpamAssassin report back
599 as a large number of 550 error lines. This bug was coincidentally fixed by
600 increasing the size of one of Exim's internal buffers (big_buffer) that
601 happened as part of the Exiscan merge. However, to be on the safe side, I
602 have made the code more robust (and fixed the comments that describe what
605 33. Some experimental protocols are using DNS PTR records for new purposes. The
606 keys for these records are domain names, not reversed IP addresses. The
607 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
608 leaves it alone. Component reversal etc. now happens only for IP addresses.
611 34. The host_aton() function is supposed to be passed a string that is known
612 to be a valid IP address. However, in the case of IPv6 addresses, it was
613 not checking this. This is a hostage to fortune. Exim now panics and dies
614 if the condition is not met. A case was found where this could be provoked
615 from a dnsdb PTR lookup with an IPv6 address that had more than 8
616 components; fortuitously, this particular loophole had already been fixed
617 by change 4.50/55 or 4.44/33 above.
619 If there are any other similar loopholes, the new check in host_aton()
620 itself should stop them being exploited. The report I received stated that
621 data on the command line could provoke the exploit when Exim was running as
622 exim, but did not say which command line option was involved. All I could
623 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
627 35. There was a buffer overflow vulnerability in the SPA authentication code
628 (which came originally from the Samba project). I have added a test to the
629 spa_base64_to_bits() function which I hope fixes it.
632 36. The daemon start-up calls getloadavg() while still root for those OS that
633 need the first call to be done as root, but it missed one case: when
634 deliver_queue_load_max is set with deliver_drop_privilege. This is
635 necessary for the benefit of the queue runner, because there is no re-exec
636 when deliver_drop_privilege is set.
638 37. Caching of lookup data for "hosts =" ACL conditions, when a named host list
639 was in use, was not putting the data itself into the right store pool;
640 consequently, it could be overwritten for a subsequent message in the same
641 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
644 38. Sometimes the final signoff response after QUIT could fail to get
645 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
646 < 0 before doing a fflush(). This bug looks as though it goes back to the
647 introduction of TLS in release 3.20, but "sometimes" must have been rare
648 because the tests only now provoked it.
654 1. Fixed a longstanding but relatively impotent bug: a long time ago, before
655 PIPELINING, the function smtp_write_command() used to return TRUE or FALSE.
656 Now it returns an integer. A number of calls were still expecting a T/F
657 return. Fortuitously, in all cases, the tests worked in OK situations,
658 which is the norm. However, things would have gone wrong on any write
659 failures on the smtp file descriptor. This function is used when sending
660 messages over SMTP and also when doing verify callouts.
662 2. When Exim is called to do synchronous delivery of a locally submitted
663 message (the -odf or -odi options), it no longer closes stderr before doing
666 3. Implemented the mua_wrapper option.
668 4. Implemented mx_fail_domains and srv_fail_domains for the dnslookup router.
670 5. Implemented the functions header_remove(), header_testname(),
671 header_add_at_position(), and receive_remove_recipient(), and exported them
674 6. If an ACL "warn" statement specified the addition of headers, Exim already
675 inserted X-ACL-Warn: at the start if there was no header name. However, it
676 was not making this test for the second and subsequent header lines if
677 there were newlines in the string. This meant that an invalid header could
678 be inserted if Exim was badly configured.
680 7. Allow an ACL "warn" statement to add header lines at the start or after all
681 the Received: headers, as well as at the end.
683 8. Added the rcpt_4xx retry error code.
685 9. Added postmaster_mailfrom=xxx to callout verification option.
687 10. Added mailfrom=xxxx to the callout verification option, for verify=
690 11. ${substr_1_:xxxx} and ${substr__3:xxxx} are now diagnosed as syntax errors
691 (they previously behaved as ${substr_1_0:xxxx} and ${substr:_0_3:xxxx}).
693 12. Inserted some casts to stop certain compilers warning when using pointer
694 differences as field lengths or precisions in printf-type calls (mostly
695 affecting debugging statements).
697 13. Added optional readline() support for -be (dynamically loaded).
699 14. Obscure bug fix: if a message error (e.g. 4xx to MAIL) happened within the
700 same clock tick as a message's arrival, so that its received time was the
701 same as the "first fail" time on the retry record, and that message
702 remained on the queue past the ultimate address timeout, every queue runner
703 would try a delivery (because it was past the ultimate address timeout) but
704 after another failure, the ultimate address timeout, which should have then
705 bounced the address, did not kick in. This was a "< instead of <=" error;
706 in most cases the first failure would have been in the next clock tick
707 after the received time, and all would be well.
709 15. The special items beginning with @ in domain lists (e.g. @mx_any) were not
710 being recognized when the domain list was tested by the match_domain
711 condition in an expansion string.
713 16. Added the ${str2b64: operator.
715 17. Exim was always calling setrlimit() to set a large limit for the number of
716 processes, without checking whether the existing limit was already
717 adequate. (It did check for the limit on file descriptors.) Furthermore,
718 errors from getrlimit() and setrlimit() were being ignored. Now they are
719 logged to the main and panic logs, but Exim does carry on, to try to do its
720 job under whatever limits there are.
722 18. Imported PCRE 5.0.
724 19. Trivial typo in log message " temporarily refused connection" (the leading
727 20. If the log selector return_path_on_delivery was set and an address was
728 redirected to /dev/null, the delivery process crashed because it assumed
729 that a return path would always be set for a "successful" delivery. In this
730 case, the whole delivery is bypassed as an optimization, and therefore no
733 21. Internal re-arrangement: the function for sending a challenge and reading
734 a response while authentication was assuming a zero-terminated challenge
735 string. It's now changed to take a pointer and a length, to allow for
736 binary data in such strings.
738 22. Added the cyrus_sasl authenticator (code supplied by MBM).
740 23. Exim was not respecting finduser_retries when seeking the login of the
741 uid under which it was called; it was always trying 10 times. (The default
742 setting of finduser_retries is zero.) Also, it was sleeping after the final
743 failure, which is pointless.
745 24. Implemented tls_on_connect_ports.
747 25. Implemented acl_smtp_predata.
749 26. If the domain in control=submission is set empty, Exim assumes that the
750 authenticated id is a complete email address when it generates From: or
751 Sender: header lines.
753 27. Added "#define SOCKLEN_T int" to OS/os.h-SCO and OS/os.h-SCO_SV. Also added
754 definitions to OS/Makefile-SCO and OS/Makefile-SCO_SV that put basename,
755 chown and chgrp in /bin and hostname in /usr/bin.
757 28. Exim was keeping the "process log" file open after each use, just as it
758 does for the main log. This opens the possibility of it remaining open for
759 long periods when the USR1 signal hits a daemon. Occasional processlog
760 errors were reported, that could have been caused by this. Anyway, it seems
761 much more sensible not to leave this file open at all, so that is what now
764 29. The long-running daemon process does not normally write to the log once it
765 has entered its main loop, and it closes the log before doing so. This is
766 so that log files can straightforwardly be renamed and moved. However,
767 there are a couple of unusual error situations where the daemon does write
768 log entries, and I had neglected to close the log afterwards.
770 30. The text of an SMTP error response that was received during a remote
771 delivery was being truncated at 512 bytes. This is too short for some of
772 the long messages that one sometimes sees. I've increased the limit to
775 31. It is now possible to make retry rules that apply only when a message has a
776 specific sender, in particular, an empty sender.
778 32. Added "control = enforce_sync" and "control = no_enforce_sync". This makes
779 it possible to be selective about when SMTP synchronization is enforced.
781 33. Added "control = caseful_local_part" and "control = "caselower_local_part".
783 32. Implemented hosts_connection_nolog.
785 33. Added an ACL for QUIT.
787 34. Setting "delay_warning=" to disable warnings was not working; it gave a
790 35. Added mailbox_size and mailbox_filecount to appendfile.
792 36. Added control = no_multiline_responses to ACLs.
794 37. There was a bug in the logic of the code that waits for the clock to tick
795 in the case where the clock went backwards by a substantial amount such
796 that the microsecond fraction of "now" was more than the microsecond
797 fraction of "then" (but the whole seconds number was less).
799 38. Added support for the libradius Radius client library this is found on
800 FreeBSD (previously only the radiusclient library was supported).
806 1. When certain lookups returned multiple values in the form name=value, the
807 quoting of the values was not always being done properly. Specifically:
808 (a) If the value started with a double quote, but contained no whitespace,
810 (b) If the value contained whitespace other than a space character (i.e.
811 tabs or newlines or carriage returns) it was not quoted.
812 This fix has been applied to the mysql and pgsql lookups by writing a
813 separate quoting function and calling it from the lookup code. The fix
814 should probably also be applied to nisplus, ibase and oracle lookups, but
815 since I cannot test any of those, I have not disturbed their existing code.
817 2. A hit in the callout cache for a specific address caused a log line with no
818 reason for rejecting RCPT. Now it says "Previous (cached) callout
819 verification failure".
821 3. There was an off-by-one bug in the queryprogram router. An over-long
822 return line was truncated at 256 instead of 255 characters, thereby
823 overflowing its buffer with the terminating zero. As well as fixing this, I
824 have increased the buffer size to 1024 (and made a note to document this).
826 4. If an interrupt, such as the USR1 signal that is send by exiwhat, arrives
827 when Exim is waiting for an SMTP response from a remote server, Exim
828 restarts its select() call on the socket, thereby resetting its timeout.
829 This is not a problem when such interrupts are rare. Somebody set up a cron
830 job to run exiwhat every 2 minutes, which is less than the normal select()
831 timeout (5 or 10 minutes). This meant that the select() timeout never
832 kicked in because it was always reset. I have fixed this by comparing the
833 time when an interrupt arrives with the time at the start of the first call
834 to select(). If more time than the timeout has elapsed, the interrupt is
835 treated as a timeout.
837 5. Some internal re-factoring in preparation for the addition of Sieve
838 extensions (by MH). In particular, the "personal" test is moved to a
839 separate function, and given an option for scanning Cc: and Bcc: (which is
840 not set for Exim filters).
842 6. When Exim created an email address using the login of the caller as the
843 local part (e.g. when creating a From: or Sender: header line), it was not
844 quoting the local part when it contained special characters such as @.
846 7. Installed new OpenBSD configuration files.
848 8. Reworded some messages for syntax errors in "and" and "or" conditions to
849 try to make them clearer.
851 9. Callout options, other than the timeout value, were being ignored when
852 verifying sender addresses in header lines. For example, when using
854 verify = header_sender/callout=no_cache
856 the cache was (incorrectly) being used.
858 10. Added a missing instance of ${EXE} to the exim_install script; this affects
859 only the Cygwin environment.
861 11. When return_path_on_delivery was set as a log selector, if different remote
862 addresses in the same message used different return paths and parallel
863 remote delivery occurred, the wrong values would sometimes be logged.
864 (Whenever a remote delivery process finished, the return path value from
865 the most recently started remote delivery process was logged.)
867 12. RFC 3848 specifies standard names for the "with" phrase in Received: header
868 lines when AUTH and/or TLS are in use. This is the "received protocol"
869 field. Exim used to use "asmtp" for authenticated SMTP, without any
870 indication (in the protocol name) for TLS use. Now it follows the RFC and
871 uses "esmtpa" if the connection is authenticated, "esmtps" if it is
872 encrypted, and "esmtpsa" if it is both encrypted and authenticated. These
873 names appear in log lines as well as in Received: header lines.
875 13. Installed MH's patches for Sieve to add the "copy" and "vacation"
876 extensions, and comparison tests, and to fix some bugs.
878 14. Changes to the "personal" filter test:
880 (1) The test was buggy in that it was just doing the equivalent of
881 "contains" tests on header lines. For example, if a user's address was
882 anne@some.where, the "personal" test would incorrectly be true for
884 To: susanne@some.where
886 This test is now done by extracting each address from the header in turn,
887 and checking the entire address. Other tests that are part of "personal"
888 are now done using regular expressions (for example, to check local parts
889 of addresses in From: header lines).
891 (2) The list of non-personal local parts in From: addresses has been
892 extended to include "listserv", "majordomo", "*-request", and "owner-*",
893 taken from the Sieve specification recommendations.
895 (3) If the message contains any header line starting with "List-" it is
896 treated as non-personal.
898 (4) The test for "circular" in the Subject: header line has been removed
899 because it now seems ill-conceived.
901 15. Minor typos in src/EDITME comments corrected.
903 16. Installed latest exipick from John Jetmore.
905 17. If headers_add on a router specified a text string that was too long for
906 string_sprintf() - that is, longer than 8192 bytes - Exim panicked. The use
907 of string_sprintf() is now avoided.
909 18. $message_body_size was not set (it was always zero) when running the DATA
910 ACL and the local_scan() function.
912 19. For the "mail" command in an Exim filter, no default was being set for
913 the once_repeat time, causing a random time value to be used if "once" was
914 specified. (If the value happened to be <= 0, no repeat happened.) The
915 default is now 0s, meaning "never repeat". The "vacation" command was OK
916 (its default is 7d). It's somewhat surprising nobody ever noticed this bug
917 (I found it when inspecting the code).
919 20. There is now an overall timeout for performing a callout verification. It
920 defaults to 4 times the callout timeout, which applies to individual SMTP
921 commands during the callout. The overall timeout applies when there is more
922 than one host that can be tried. The timeout is checked before trying the
923 next host. This prevents very long delays if there are a large number of
924 hosts and all are timing out (e.g. when the network connections are timing
925 out). The value of the overall timeout can be changed by specifying an
926 additional sub-option for "callout", called "maxwait". For example:
928 verify = sender/callout=5s,maxwait=20s
930 21. Add O_APPEND to the open() call for maildirsize files (Exim already seeks
931 to the end before writing, but this should make it even safer).
933 22. Exim was forgetting that it had advertised PIPELINING for the second and
934 subsequent messages on an SMTP connection. It was also not resetting its
935 memory on STARTTLS and an internal HELO.
937 23. When Exim logs an SMTP synchronization error within a session, it now
938 records whether PIPELINING has been advertised or not.
940 24. Added 3 instances of "(long int)" casts to time_t variables that were being
941 formatted using %ld, because on OpenBSD (and perhaps others), time_t is int
942 rather than long int.
944 25. Installed the latest Cygwin configuration files from the Cygwin maintainer.
946 26. Added the never_mail option to autoreply.
952 1. A reorganization of the code in order to implement 4.40/8 caused a daemon
953 crash if the getsockname() call failed; this can happen if a connection is
954 closed very soon after it is established. The problem was simply in the
955 order in which certain operations were done, causing Exim to try to write
956 to the SMTP stream before it had set up the file descriptor. The bug has
957 been fixed by making things happen in the correct order.
963 1. If "drop" was used in a DATA ACL, the SMTP output buffer was not flushed
964 before the connection was closed, thus losing the rejection response.
966 2. Commented out the definition of SOCKLEN_T in os.h-SunOS5. It is needed for
967 some early Solaris releases, but causes trouble in current releases where
968 socklen_t is defined.
970 3. When std{in,out,err} are closed, re-open them to /dev/null so that they
973 4. Minor refactoring of os.c-Linux to avoid compiler warning when IPv6 is not
976 5. Refactoring in expand.c to improve memory usage. Pre-allocate a block so
977 that releasing the top of it at the end releases what was used for sub-
978 expansions (unless the block got too big). However, discard this block if
979 the first thing is a variable or header, so that we can use its block when
980 it is dynamic (useful for very large $message_headers, for example).
982 6. Lookups now cache *every* query, not just the most recent. A new, separate
983 store pool is used for this. It can be recovered when all lookup caches are
984 flushed. Lookups now release memory at the end of their result strings.
985 This has involved some general refactoring of the lookup sources.
987 7. Some code has been added to the store_xxx() functions to reduce the amount
988 of flapping under certain conditions.
990 8. log_incoming_interface used to affect only the <= reception log lines. Now
991 it causes the local interface and port to be added to several more SMTP log
992 lines, for example "SMTP connection from", and rejection lines.
994 9. The Sieve author supplied some patches for the doc/README.SIEVE file.
996 10. Added a conditional definition of _BSD_SOCKLEN_T to os.h-Darwin.
998 11. If $host_data was set by virtue of a hosts lookup in an ACL, its value
999 could be overwritten at the end of the current message (or the start of a
1000 new message if it was set in a HELO ACL). The value is now preserved for
1001 the duration of the SMTP connection.
1003 12. If a transport had a headers_rewrite setting, and a matching header line
1004 contained an unqualified address, that address was qualified, even if it
1005 did not match any rewriting rules. The underlying bug was that the values
1006 of the flags that permit the existence of unqualified sender and recipient
1007 addresses in header lines (set by {sender,recipient}_unqualified_hosts for
1008 non-local messages, and by -bnq for local messages) were not being
1009 preserved with the message after it was received.
1011 13. When Exim was logging an SMTP synchronization error, it could sometimes log
1012 "next input=" as part of the text comprising the host identity instead of
1013 the correct text. The code was using the same buffer for two different
1014 strings. However, depending on which order the printing function evaluated
1015 its arguments, the bug did not always show up. Under Linux, for example, my
1016 test suite worked just fine.
1018 14. Exigrep contained a use of Perl's "our" scoping after change 4.31/70. This
1019 doesn't work with some older versions of Perl. It has been changed to "my",
1020 which in any case is probably the better facility to use.
1022 15. A really picky compiler found some instances of statements for creating
1023 error messages that either had too many or two few arguments for the format
1026 16. The size of the buffer for calls to the DNS resolver has been increased
1027 from 1024 to 2048. A larger buffer is needed when performing PTR lookups
1028 for addresses that have a lot of PTR records. This alleviates a problem; it
1029 does not fully solve it.
1031 17. A dnsdb lookup for PTR records that receives more data than will fit in the
1032 buffer now truncates the list and logs the incident, which is the same
1033 action as happens when Exim is looking up a host name and its aliases.
1034 Previously in this situation something unpredictable would happen;
1035 sometimes it was "internal error: store_reset failed".
1037 18. If a server dropped the connection unexpectedly when an Exim client was
1038 using GnuTLS and trying to read a response, the client delivery process
1039 crashed while trying to generate an error log message.
1041 19. If a "warn" verb in an ACL added multiple headers to a message in a single
1042 string, for example:
1044 warn message = H1: something\nH2: something
1046 the text was added as a single header line from Exim's point of view
1047 though it ended up OK in the delivered message. However, searching for the
1048 second and subsequent header lines using $h_h2: did not work. This has been
1049 fixed. Similarly, if a system filter added multiple headers in this way,
1050 the routers could not see them.
1052 20. Expanded the error message when iplsearch is called with an invalid key to
1053 suggest using net-iplsearch in a host list.
1055 21. When running tests using -bh, any delays imposed by "delay" modifiers in
1056 ACLs are no longer actually imposed (and a message to that effect is
1059 22. If a "gecos" field in a passwd entry contained escaped characters, in
1060 particular, if it contained a \" sequence, Exim got it wrong when building
1061 a From: or a Sender: header from that name. A second bug also caused
1062 incorrect handling when an unquoted " was present following a character
1063 that needed quoting.
1065 23. "{crypt}" as a password encryption mechanism for a "crypteq" expansion item
1066 was not being matched caselessly.
1068 24. Arranged for all hyphens in the exim.8 source to be escaped with
1071 25. Change 16 of 4.32, which reversed 71 or 4.31 didn't quite do the job
1072 properly. Recipient callout cache records were still being keyed to include
1073 the sender, even when use_sender was set false. This led to far more
1074 callouts that were necessary. The sender is no longer included in the key
1075 when use_sender is false.
1077 26. Added "control = submission" modifier to ACLs.
1079 27. Added the ${base62d: operator to decode base 62 numbers.
1081 28. dnsdb lookups can now access SRV records.
1083 29. CONFIGURE_OWNER can be set at build time to define an alternative owner for
1084 the configuration file.
1086 30. The debug message "delivering xxxxxx-xxxxxx-xx" is now output in verbose
1087 (-v) mode. This makes the output for a verbose queue run more intelligible.
1089 31. Added a use_postmaster feature to recipient callouts.
1091 32. Added the $body_zerocount variable, containing the number of binary zero
1092 bytes in the message body.
1094 33. The time of last modification of the "new" subdirectory is now used as the
1095 "mailbox time last read" when there is a quota error for a maildir
1098 34. Added string comparison operators lt, lti, le, lei, gt, gti, ge, gei.
1100 35. Added +ignore_unknown as a special item in host lists.
1102 36. Code for decoding IPv6 addresses in host lists is now included, even if
1103 IPv6 support is not being compiled. This fixes a bug in which an IPv6
1104 address was recognized as an IP address, but was then not correctly decoded
1105 into binary, causing unexpected and incorrect effects when compared with
1112 1. Very minor rewording of debugging text in manualroute to say "list of
1113 hosts" instead of "hostlist".
1115 2. If verify=header_syntax was set, and a header line with an unqualified
1116 address (no domain) and a large number of spaces between the end of the
1117 name and the colon was received, the reception process suffered a buffer
1118 overflow, and (when I tested it) crashed. This was caused by some obsolete
1119 code that should have been removed. The fix is to remove it!
1121 3. When running in the test harness, delay a bit after writing a bounce
1122 message to get a bit more predictability in the log output.
1124 4. Added a call to search_tidyup() just before forking a reception process. In
1125 theory, someone could use a lookup in the expansion of smtp_accept_max_
1126 per_host which, without the tidyup, could leave open a database connection.
1128 5. Added the variables $recipient_data and $sender_data which get set from a
1129 lookup success in an ACL "recipients" or "senders" condition, or a router
1130 "senders" option, similar to $domain_data and $local_part_data.
1132 6. Moved the writing of debug_print from before to after the "senders" test
1135 7. Change 4.31/66 (moving the time when the Received: is generated) caused
1136 problems for message scanning, either using a data ACL, or using
1137 local_scan() because the Received: header was not generated till after they
1138 were called (in order to set the time as the time of reception completion).
1139 I have revised the way this works. The header is now generated after the
1140 body is received, but before the ACL or local_scan() are called. After they
1141 are run, the timestamp in the header is updated.
1147 1. Change 4.24/6 introduced a bug because the SIGALRM handler was disabled
1148 before starting a queue runner without re-exec. This happened only when
1149 deliver_drop_privilege was set or when the Exim user was set to root. The
1150 effect of the bug was that timeouts during subsequent deliveries caused
1151 crashes instead of being properly handled. The handler is now left at its
1152 default (and expected) setting.
1154 2. The other case in which a daemon avoids a re-exec is to deliver an incoming
1155 message, again when deliver_drop_privilege is set or Exim is run as root.
1156 The bug described in (1) was not present in this case, but the tidying up
1157 of the other signals was missing. I have made the two cases consistent.
1159 3. The ignore_target_hosts setting on a manualroute router was being ignored
1160 for hosts that were looked up using the /MX notation.
1162 4. Added /ignore=<ip list> feature to @mx_any, @mx_primary, and @mx_secondary
1165 5. Change 4.31/55 was buggy, and broke when there was a rewriting rule that
1166 operated on the sender address. After changing the $sender_address to <>
1167 for the sender address verify, Exim was re-instated it as the original
1168 (before rewriting) address, but remembering that it had rewritten it, so it
1169 wasn't rewriting it again. This bug also had the effect of breaking the
1170 sender address verification caching when the sender address was rewritten.
1172 6. The ignore_target_hosts option was being ignored by the ipliteral router.
1173 This has been changed so that if the ip literal address matches
1174 ignore_target_hosts, the router declines.
1176 7. Added expansion conditions match_domain, match_address, and match_local_
1177 part (NOT match_host).
1179 8. The placeholder for the Received: header didn't have a length field set.
1181 9. Added code to Exim itself and to exim_lock to test for a specific race
1182 condition that could lead to file corruption when using MBX delivery. The
1183 issue is with the lockfile that is created in /tmp. If this file is removed
1184 after a process has opened it but before that process has acquired a lock,
1185 there is the potential for a second process to recreate the file and also
1186 acquire a lock. This could lead to two Exim processes writing to the file
1187 at the same time. The added code performs the same test as UW imapd; it
1188 checks after acquiring the lock that its file descriptor still refers to
1189 the same named file.
1191 10. The buffer for building added header lines was of fixed size, 8192 bytes.
1192 It is now parameterized by HEADER_ADD_BUFFER_SIZE and this can be adjusted
1195 11. Added the smtp_active_hostname option. If used, this will typically be made
1196 to depend on the incoming interface address. Because $interface_address is
1197 not set up until the daemon has forked a reception process, error responses
1198 that can happen earlier (such as "too many connections") no longer contain
1201 12. If an expansion in a condition on a "warn" statement fails because a lookup
1202 defers, the "warn" statement is abandoned, and the next ACL statement is
1203 processed. Previously this caused the whole ACL to be aborted.
1205 13. Added the iplsearch lookup type.
1207 14. Added ident_timeout as a log selector.
1209 15. Added tls_certificate_verified as a log selector.
1211 16. Added a global option tls_require_ciphers (compare the smtp transport
1212 option of the same name). This controls incoming TLS connections.
1214 17. I finally figured out how to make tls_require_ciphers do a similar thing
1215 in GNUtls to what it does in OpenSSL, that is, set up an appropriate list
1216 before starting the TLS session.
1218 18. Tabs are now shown as \t in -bP output.
1220 19. If the log selector return_path_on_delivery was set, Exim crashed when
1221 bouncing a message because it had too many Received: header lines.
1223 20. If two routers both had headers_remove settings, and the first one included
1224 a superfluous trailing colon, the final name in the first list and the
1225 first name in the second list were incorrectly joined into one item (with a
1226 colon in the middle).
1232 1. Added -C and -D options to the exinext utility, mainly to make it easier
1233 to include in the automated testing, but these could be helpful when
1234 multiple configurations are in use.
1236 2. The exinext utility was not formatting the output nicely when there was
1237 an alternate port involved in the retry record key, nor when there was a
1238 message id as well (for retries that were specific to a specific message
1239 and a specific host). It was also confused by IPv6 addresses, because of
1240 the additional colons they contain. I have fixed the IPv4 problem, and
1241 patched it up to do a reasonable job for IPv6.
1243 3. When there is an error after a MAIL, RCPT, or DATA SMTP command during
1244 delivery, the log line now contains "pipelined" if PIPELINING was used.
1246 4. An SMTP transport process used to panic and die if the bind() call to set
1247 an explicit outgoing interface failed. This has been changed; it is now
1248 treated in the same way as a connect() failure.
1250 5. A reference to $sender_host_name in the part of a conditional expansion
1251 that was being skipped was still causing a DNS lookup. This no longer
1254 6. The def: expansion condition was not recognizing references to header lines
1255 that used bh_ and bheader_.
1257 7. Added the _cache feature to named lists.
1259 8. The code for checking quota_filecount in the appendfile transport was
1260 allowing one more file than it should have been.
1262 9. For compatibility with Sendmail, the command line option
1270 and sets the incoming protocol and host name (for trusted callers). The
1271 host name and its colon can be omitted when only the protocol is to be set.
1272 Note the Exim already has two private options, -pd and -ps, that refer to
1273 embedded Perl. It is therefore impossible to set a protocol value of "d" or
1274 "s", but I don't think that's a major issue.
1276 10. A number of refactoring changes to the code, none of which should affect
1279 (a) The number of logging options was getting close to filling up the
1280 32-bit word that was used as a bit map. I have split them into two classes:
1281 those that are passed in the argument to log_write(), and those that are
1282 only ever tested independently outside of that function. These are now in
1283 separate 32-bit words, so there is plenty of room for expansion again.
1284 There is no change in the user interface or the logging behaviour.
1286 (b) When building, for example, log lines, the code previously used a
1287 macro that called string_cat() twice, in order to add two strings. This is
1288 not really sufficiently general. Furthermore, there was one instance where
1289 it was actually wrong because one of the argument was used twice, and in
1290 one call a function was used. (As it happened, calling the function twice
1291 did not affect the overall behaviour.) The macro has been replaced by a
1292 function that can join an arbitrary number of extra strings onto a growing
1295 (c) The code for expansion conditions now uses a table and a binary chop
1296 instead of a serial search (which was left over from when there were very
1297 few conditions). Also, it now recognizes conditions like "pam" even when
1298 the relevant support is not compiled in: a suitably worded error message is
1299 given if an attempt is made to use such a condition.
1301 11. Added ${time_interval:xxxxx}.
1303 12. A bug was causing one of the ddress fields not to be passed back correctly
1304 from remote delivery subprocesses. The field in question was not being
1305 subsequently used, so this caused to problems in practice.
1307 13. Added new log selectors queue_time and deliver_time.
1309 14. Might have fixed a bug in maildirsizefile handling that threw up
1310 "unexpected character" debug warnings, and recalculated the data
1311 unnecessarily. In any case, I expanded the warning message to give more
1314 15. Added the message "Restricted characters in address" to the statements in
1315 the default ACL that block characters like @ and % in local parts.
1317 16. Change 71 for release 4.31 proved to be much less benign that I imagined.
1318 Three changes have been made:
1320 (a) There was a serious bug; a negative response to MAIL caused the whole
1321 recipient domain to be cached as invalid, thereby blocking all messages
1322 to all local parts at the same domain, from all senders. This bug has
1323 been fixed. The domain is no longer cached after a negative response to
1324 MAIL if the sender used is not empty.
1326 (b) The default behaviour of using MAIL FROM:<> for recipient callouts has
1329 (c) A new callout option, "use_sender" has been added for people who want
1330 the modified behaviour.
1336 1. Removed "EXTRALIBS=-lwrap" from OS/Makefile-Unixware7 on the advice of
1339 2. Removed "LIBS = -lresolv" from OS/Makefile-Darwin as it is not needed, and
1340 indeed breaks things for older releases.
1342 3. Added additional logging to the case where there is a problem reading data
1343 from a filter that is running in a subprocess using a pipe, in order to
1344 try to track down a specific problem.
1346 4. Testing facility fudge: when running in the test harness and attempting
1347 to connect to 10.x.x.x (expecting a connection timeout) I'm now sometimes
1348 getting "No route to host". Convert this to a timeout.
1350 5. Define ICONV_ARG2_TYPE as "char **" for Unixware7 to avoid compiler
1353 6. Some OS don't have socklen_t but use size_t instead. This affects the
1354 fifth argument of getsockopt() amongst other things. This is now
1355 configurable by a macro called SOCKLEN_T which defaults to socklen_t, but
1356 can be set for individual OS. I have set it for SunOS5, OSF1, and
1357 Unixware7. Current versions of SunOS5 (aka Solaris) do have socklen_t, but
1358 some earlier ones do not.
1360 7. Change 4.30/15 was not doing the test caselessly.
1362 8. The standard form for an IPv6 address literal was being rejected by address
1363 parsing in, for example, MAIL and RCPT commands. An example of this kind of
1364 address is [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
1365 this, as well as the form without the "IPv6" on the front (but only when
1366 address literals are enabled, of course).
1368 9. Added some casts to avoid compiler warnings in OS/os.c-Linux.
1370 10. Exim crashed if a message with an empty sender address specified by -f
1371 encountered a router with an errors_to setting. This could be provoked only
1372 by a command such as
1376 where an empty string was supplied; "<>" did not hit this bug.
1378 11. Installed PCRE release 4.5.
1380 12. If EHLO/HELO was rejected by an ACL, the value of $sender_helo_name
1381 remained set. It is now erased.
1383 13. exiqgrep wasn't working on MacOS X because it didn't correctly compute
1384 times from message ids (which are base 36 rather than the normal 62).
1386 14. "Expected" SMTP protocol errors that can arise when PIPELINING is in use
1387 were being counted as actual protocol errors, and logged if the log
1388 selector +smtp_protocol_error was set. One cannot be perfect in this test,
1389 but now, if PIPELINING has been advertised, RCPT following a rejected MAIL,
1390 and DATA following a set of rejected RCPTs do not count as protocol errors.
1391 In other words, Exim assumes they were pipelined, though this may not
1392 actually be the case. Of course, in all cases the client gets an
1393 appropriate error code.
1395 15. If a lookup fails in an ACL condition, a message about the failure may
1396 be available; it is used if testing the ACL cannot continue, because most
1397 such messages specify what the cause of the deferral is. However, some
1398 messages (e.g. "MYSQL: no data found") do not cause a defer. There was bug
1399 that caused an old message to be retained and used if a later statement
1400 caused a defer, replacing the real cause of the deferral.
1402 16. If an IP address had so many PTR records that the DNS lookup buffer
1403 was not large enough to hold them, Exim could crash while trying to process
1404 the truncated data. It now detects and logs this case.
1406 17. Further to 4.21/58, another change has been made: if (and only if) the
1407 first line of a message (the first header line) ends with CRLF, a bare LF
1408 in a subsequent header line has a space inserted after it, so as not to
1409 terminate the header.
1411 18. Refactoring: tidied an ugly bit of code in appendfile that copied data
1412 unnecessarily, used atoi() instead of strtol(), and didn't check the
1413 termination when getting file sizes from file names by regex.
1415 19. Completely re-implemented the support for maildirsize files, in the light
1416 of a number of problems with the previous contributed implementation
1417 (4.30/29). In particular:
1419 . If the quota is zero, the maildirsize file is maintained, but no quota is
1422 . If the maildir directory does not exist, it is created before any attempt
1423 to write a maildirsize file.
1425 . The quota value in the file is just a cache; if the quota is changed in
1426 the transport, the new value overrides.
1428 . A regular expression is available for excluding directories from the
1431 20. The autoreply transport checks the characters in options that define the
1432 message's headers; it allows continued headers, but it was checking with
1433 isspace() after an embedded newline instead of explicitly looking for a
1436 21. If all the "regular" hosts to which an address was routed had passed their
1437 expiry times, and had not reached their retry times, the address was
1438 bounced, even if fallback hosts were defined. Now Exim should go on to try
1441 22. Increased buffer sizes in the callout code from 1024 to 4096 to match the
1442 equivalent code in the SMTP transport. Some hosts send humungous responses
1443 to HELO/EHLO, more than 1024 it seems.
1445 23. Refactoring: code in filter.c used (void *) for "any old type" but this
1446 gives compiler warnings in some environments. I've now done it "properly",
1449 24. The replacement for inet_ntoa() that is used with gcc on IRIX systems
1450 (because of problems with the built-in one) was declared to return uschar *
1451 instead of char *, causing compiler failure.
1453 25. Fixed a file descriptor leak when processing alias/forward files.
1455 26. Fixed a minor format string issue in dbfn.c.
1457 27. Typo in exim.c: ("dmbnz" for "dbmnz").
1459 28. If a filter file refered to $h_xxx or $message_headers, and the headers
1460 contained RFC 2047 "words", Exim's memory could, under certain conditions,
1463 29. When a sender address is verified, it is cached, to save repeating the test
1464 when there is more than one recipient in a message. However, when the
1465 verification involves a callout, it is possible for different callout
1466 options to be set for different recipients. It is too complicated to keep
1467 track of this in the cache, so now Exim always runs a verification when a
1468 callout is required, relying on the callout cache for the optimization.
1469 The overhead is duplication of the address routing, but this should not be
1472 30. Fixed a bug in callout caching. If a RCPT command caused the sender address
1473 to be verified with callout=postmaster, and the main callout worked but the
1474 postmaster check failed, the verification correctly failed. However, if a
1475 subsequent RCPT command asked for sender verification *without* the
1476 postmaster check, incorrect caching caused this verification also to fail,
1479 31. Exim caches DNS lookup failures so as to avoid multiple timeouts; however,
1480 it was not caching the DNS options (qualify_single, search_parents) that
1481 were used when the lookup failed. A subsequent lookup with different
1482 options therefore always gave the same answer, though there were cases
1483 where it should not have. (Example: a "domains = !$mx_any" option on a
1484 dnslookup router: the "domains" option is always processed without any
1485 widening, but the router might have qualify_single set.) Now Exim uses the
1486 cached value only when the same options are set.
1488 32. Added John Jetmore's "exipick" utility to the distribution.
1490 33. GnuTLS: When an attempt to start a TLS session fails for any reason other
1491 than a timeout (e.g. a certificate is required, and is not provided), an
1492 Exim server now closes the connection immediately. Previously it waited for
1493 the client to close - but if the client is SSL, it seems that they each
1494 wait for each other, leading to a delay before one of them times out.
1496 34: GnuTLS: Updated the code to use the new GnuTLS 1.0.0 API. I have not
1497 maintained 0.8.x compatibility because I don't think many are using it, and
1498 it is clearly obsolete.
1500 35. Added TLS support for CRLs: a tls_crl global option and one for the smtp
1503 36. OpenSSL: $tls_certificate_verified was being set to 1 even if the
1504 client certificate was expired. A simple patch fixes this, though I don't
1505 understand the full logic of why the verify callback is called multiple
1508 37. OpenSSL: a patch from Robert Roselius: "Enable client-bug workaround.
1509 Versions of OpenSSL as of 0.9.6d include a 'CBC countermeasure' feature,
1510 which causes problems with some clients (such as the Certicom SSL Plus
1511 library used by Eudora). This option, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS,
1512 disables the coutermeasure allowing Eudora to connect."
1514 38. Exim was not checking that a write() to a log file succeeded. This could
1515 lead to Bad Things if a log got too big, in particular if it hit a file
1516 size limit. Exim now panics and dies if it cannot write to a log file, just
1517 as it does if it cannot open a log file.
1519 39. Modified OS/Makefile-Linux so that it now contains
1521 CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
1523 The two -D definitions ensure that Exim is compiled with large file
1524 support, which makes it possible to handle log files that are bigger than
1527 40. Fixed a subtle caching bug: if (in an ACL or a set of routers, for
1528 instance) a domain was checked against a named list that involved a lookup,
1529 causing $domain_data to be set, then another domain was checked against the
1530 same list, then the first domain was re-checked, the value of $domain_data
1531 after the final check could be wrong. In particular, if the second check
1532 failed, it could be set empty. This bug probably also applied to
1535 41. The strip_trailing_dot option was not being applied to the address given
1536 with the -f command-line option.
1538 42. The code for reading a message's header from the spool was incrementing
1539 $received_count, but never initializing it. This meant that the value was
1540 incorrect (doubled) while delivering a message in the same process in which
1541 it was received. In the most common configuration of Exim, this never
1542 happens - a fresh exec is done - but it can happen when
1543 deliver_drop_privilege is set.
1545 43. When Exim logs an SMTP synchronization error - client data sent too soon -
1546 it now includes up to 150 characters of the unexpected data in the log
1549 44. The exim_dbmbuild utility uses fixed size buffers for reading input lines
1550 and building data strings. The size of both of these buffers was 10 000
1551 bytes - far larger than anybody would *ever* want, thought I. Needless to
1552 say, somebody hit the limit. I have increased the maximum line length to
1553 20 000 and the maximum data length of concatenated lines to 100 000. I have
1554 also fixed two bugs, because there was no checking on these buffers. Tsk,
1555 tsk. Now exim_dbmbuild gives a message and exits with an error code if a
1556 buffer is too small.
1558 45. The exim_dbmbuild utility did not support quoted keys, as Exim does in
1559 lsearch lookups. Now it does.
1561 46. When parsing a route_list item in a manualroute router, a fixed-length
1562 buffer was used for the list of hosts. I made this 1024 bytes long,
1563 thinking that nobody would ever have a list of hosts that long. Wrong.
1564 Somebody had a whole pile of complicated expansion conditions, and the
1565 string was silently truncated, leading to an expansion error. It turns out
1566 that it is easier to change to an unlimited length (owing to other changes
1567 that have happened since this code was originally written) than to build
1568 structure for giving a limitation error. The length of the item that
1569 expands into the list of hosts is now unlimited.
1571 47. The lsearch lookup could not handle data where the length of text line was
1572 more than 4095 characters. Such lines were truncated, leading to shortened
1573 data being returned. It should now handle lines of any length.
1575 48. Minor wording revision: "cannot test xxx in yyy ACL" becomes "cannot test
1576 xxx condition in yyy ACL" (e.g. "cannot test domains condition in DATA
1579 49. Cosmetic tidy to scripts like exicyclog that are generated by globally
1580 replacing strings such as BIN_DIRECTORY in a source file: the replacement
1581 no longer happens in comment lines. A list of replacements is now placed
1582 at the head of all of the source files, except those whose only change is
1583 to replace PERL_COMMAND in the very first #! line.
1585 50. Replaced the slow insertion sort in queue.c, for sorting the list of
1586 messages on the queue, with a bottom-up merge sort, using code contributed
1587 by Michael Haardt. This should make operations like -bp somewhat faster on
1588 large queues. It won't affect queue runners, except when queue_run_in_order
1591 51. Installed eximstats 1.31 in the distribution.
1593 52. Added support for SRV lookups to the dnslookup router.
1595 53. If an ACL referred to $message_body or $message_body_end, the value was not
1596 reset for any messages that followed in the same SMTP session.
1598 54. The store-handling optimization for building very long strings was not
1599 differentiating between the different store pools. I don't think this
1600 actually made any difference in practice, but I've tidied it.
1602 55. While running the routers to verify a sender address, $sender_address
1603 was still set to the sender address. This is wrong, because when routing to
1604 send a bounce to the sender, it would be empty. Therefore, I have changed
1605 it so that, while verifying a sender address, $sender_address is set to <>.
1606 (There is no change to what happens when verifying a recipient address.)
1608 56. After finding MX (or SRV) records, Exim was doing a DNS lookup for the
1609 target A or AAAA records (if not already returned) without resetting the
1610 qualify_single or search_parents options of the DNS resolver. These are
1611 inappropriate in this case because the targets of MX and SRV records must
1612 be FQDNs. A broken DNS record could cause trouble if it happened to have a
1613 target that, when qualified, matched something in the local domain. These
1614 two options are now turned off when doing these lookups.
1616 57. It seems that at least some releases of Reiserfs (which does not have the
1617 concept of a fixed number of inodes) returns zero and not -1 for the
1618 number of available inodes. This interacted badly with check_spool_inodes,
1619 which assumed that -1 was the "no such thing" setting. What I have done is
1620 to check that the total number of inodes is greater than zero before doing
1621 the test of how many are available.
1623 58. When a "warn" ACL statement has a log_message modifier, the message is
1624 remembered, and not repeated. This is to avoid a lot of repetition when a
1625 message has many recipients that cause the same warning to be written.
1626 Howewer, Exim was preserving the list of already written lines for an
1627 entire SMTP session, which doesn't seem right. The memory is now reset if a
1628 new message is started.
1630 59. The "rewrite" debugging flag was not showing the result of rewriting in the
1631 debugging output unless log_rewrite was also set.
1633 60. Avoid a compiler warning on 64-bit systems in dsearch.c by avoiding the use
1634 of (int)(handle) when we know that handle contains (void *)(-1).
1636 61. The Exim daemon panic-logs an error return when it closes the incoming
1637 connection. However "connection reset by peer" seems to be common, and
1638 isn't really an error worthy of noting specially, so that particular error
1641 62. When Exim is trying to find all the local interfaces, it used to panic and
1642 die if the ioctl to get the interface flags failed. However, it seems that
1643 on at least one OS (Solaris 9) it is possible to have an interface that is
1644 included in the list of interfaces, but for which you get a failure error
1645 for this call. This happens when the interface is not "plumbed" into a
1646 protocol (i.e. neither IPv4 nor IPv6). I've changed the code so that a
1647 failure of the "get flags" call assumes that the interface is down.
1649 63. Added a ${eval10: operator, which assumes all numbers are decimal. This
1650 makes life easier for people who are doing arithmetic on fields extracted
1651 from dates, where you often get leading zeros that should not be
1652 interpreted as octal.
1654 64. Added qualify_domain to the redirect router, to override the global
1657 65. If a pathologically long header line contained very many addresses (the
1658 report of this problem mentioned 10 000) and each of them was rewritten,
1659 Exim could use up a very large amount of memory. (It kept on making new
1660 copies of the header line as it rewrote, and never released the old ones.)
1661 At the expense of a bit more processing, the header rewriting function has
1662 been changed so that it no longer eats memory in this way.
1664 66. The generation of the Received: header has been moved from the time that a
1665 message starts to be received, to the time that it finishes. The timestamp
1666 in the Received: header should now be very close to that of the <= log
1667 line. There are two side-effects of this change:
1669 (a) If a message is rejected by a DATA or non-SMTP ACL or local_scan(), the
1670 logged header lines no longer include the local Received: line, because
1671 it has not yet been created. The same applies to a copy of the message
1672 that is returned to a non-SMTP sender when a message is rejected.
1674 (b) When a filter file is tested using -bf, no additional Received: header
1675 is added to the test message. After some thought, I decided that this
1678 This change does not affect the value of $received_for. It is still set
1679 after address rewriting, but before local_scan() is called.
1681 67. Installed the latest Cygwin-specific files from the Cygwin maintainer.
1683 68. GnuTLS: If an empty file is specified for tls_verify_certificates, GnuTLS
1684 gave an unhelpful panic error message, and a defer error. I have managed to
1685 change this behaviour so that it now rejects any supplied certificate,
1686 which seems right, as the list of acceptable certificates is empty.
1688 69. OpenSSL: If an empty file is specified for tls_verify_certificates, OpenSSL
1689 gave an unhelpful defer error. I have not managed to make this reject any
1690 supplied certificates, but the error message it gives is "no certificate
1691 supplied", which is not helpful.
1693 70. exigrep's output now also includes lines that are not associated with any
1694 message, but which match the given pattern. Implemented by a patch from
1695 Martin Sluka, which also tidied up the Perl a bit.
1697 71. Recipient callout verification, like sender verification, was using <> in
1698 the MAIL FROM command. This isn't really the right thing, since the actual
1699 sender may affect whether the remote host accepts the recipient or not. I
1700 have changed it to use the actual sender in the callout; this means that
1701 the cache record is now keyed on a recipient/sender pair, not just the
1702 recipient address. There doesn't seem to be a real danger of callout loops,
1703 since a callout by the remote host to check the sender would use <>.
1704 [SEE ABOVE: changed after hitting problems.]
1706 72. Exim treats illegal SMTP error codes that do not begin with 4 or 5 as
1707 temporary errors. However, in the case of such a code being given after
1708 the end of a data transmission (i.e. after ".") Exim was failing to write
1709 a retry record for the message. (Yes, there was some broken host that was
1710 actually sending 8xx at this point.)
1712 73. An unknown lookup type in a host list could cause Exim to panic-die when
1713 the list was checked. (An example that provoked this was putting <; in the
1714 middle of a list instead of at the start.) If this happened during a DATA
1715 ACL check, a -D file could be left lying around. This kind of configuration
1716 error no longer causes Exim to die; instead it causes a defer errror. The
1717 incident is still logged to the main and panic logs.
1719 74. Buglet left over from Exim 3 conversion. The message "too many messages
1720 in one connection" was written to the rejectlog but not the mainlog, except
1721 when address rewriting (yes!) was being logged.
1723 75. Added write_rejectlog option.
1725 76. When a system filter was run not as root (that is, when system_filter_user
1726 was set), the values of the $n variables were not being returned to the
1727 main process; thus, they were not subsequently available in the $sn
1730 77. Added +return_path_on_delivery log selector.
1732 78. A connection timeout was being treated differently from recipients deferred
1733 when testing hosts_max_try with a message that was older than the host's
1734 retry timeout. (The host should not be counted, thus allowing all hosts to
1735 be tried at least once before bouncing.) This may have been the cause of an
1736 occasionally reported bug whereby a message would remain on the queue
1737 longer than the retry timeout, but would be bounced if a delivery was
1738 forced. I say "may" because I never totally pinned down the problem;
1739 setting up timeout/retry tests is difficult. See also the next item.
1741 79. The ultimate address timeout was not being applied to errors that involved
1742 a combination of host plus message (for example, a timeout on a MAIL
1743 command). When an address resolved to a number of possible hosts, and they
1744 were not all tried for each delivery (e.g. because of hosts_max_try), a
1745 message could remain on the queue longer than the retry timeout.
1747 80. Sieve bug: "stop" inside "elsif" was broken. Applied a patch from Michael
1750 81. Fixed an obscure SMTP outgoing bug which required at least the following
1751 conditions: (a) there was another message waiting for the same server;
1752 (b) the server returned 5xx to all RCPT commands in the first message so
1753 that the message was not completed; (c) the server dropped the connection
1754 or gave a negative response to the RSET that Exim sends to abort the
1755 transaction. The observed case was a dropped connection after DATA that had
1756 been sent in pipelining mode. That is, the server had advertised PIPELINING
1757 but was not implementing it correctly. The effect of the bug was incorrect
1758 behaviour, such as trying another host, and this could lead to a crash.
1764 1. The 3rd arguments to getsockname(), getpeername(), and accept() in exim.c
1765 and daemon.c were passed as pointers to ints; they should have been
1766 pointers to socklen_t variables (which are typically unsigned ints).
1768 2. Some signed/unsigned type warnings in the os.c file for Linux have been
1771 3. Fixed a really odd bug that affected only the testing scheme; patching a
1772 certain fixed string in the binary changed the value of another string that
1773 happened to be identical to the end of the original first string.
1775 4. When gethostbyname() (or equivalent) is passed an IP address as a "host
1776 name", it returns that address as the IP address. On some operating
1777 systems (e.g. Solaris), it also passes back the IP address string as the
1778 "host name". However, on others (e.g. Linux), it passes back an empty
1779 string. Exim wasn't checking for this, and was changing the host name to an
1780 empty string, assuming it had been canonicized.
1782 5. Although rare, it is permitted to have more than one PTR record for a given
1783 IP address. I thought that gethostbyaddr() or getipnodebyaddr() always gave
1784 all the names associated with an address, because they do in Solaris.
1785 However, it seems that they do not in Linux for data that comes from the
1786 DNS. If an address in /etc/hosts has multiple names, they _are_ all given.
1787 I found this out when I moved to a new Linux workstation and tried to run
1788 the Exim test suite.
1790 To get round this problem I have changed the code so that it now does its
1791 own call to the DNS to look up PTR records when searching for a host name.
1792 If nothing can be found in the DNS, it tries gethostbyaddr(), so that
1793 addresses that are only in /etc/hosts are still found.
1795 This behaviour is, however, controlled by an option called host_lookup_
1796 order, which defaults to "bydns:byaddr". If people want to use the other
1797 order, or indeed, just use one or the other means of lookup, they can
1798 specify it in this variable.
1800 6. If a PTR record yields an empty name, Exim treats it as non-existent. In
1801 some operating systems, this comes back from gethostbyaddr() as an empty
1802 string, and this is what Exim used to test for. However, it seems that in
1803 other systems, "." is yielded. Exim now tests for this case too.
1805 7. The values of check_spool_space and check_log_space are now held internally
1806 as a number of kilobytes instead of an absolute number of bytes. If a
1807 numbers is specified without 'K' or 'M', it is rounded up to the nearest
1808 kilobyte. This means that much larger values can be stored.
1810 8. Exim monitor: an attempt to get the action menu when not actually pointing
1811 at a message produces an empty menu entitled "No message selected". This
1812 works on Solaris (OpenWindows). However, XFree86 does not like a menu with
1813 no entries in it ("Shell widget menu has zero width and/or height"). So I
1814 have added a single, blank menu entry in this case.
1816 9. Added ${quote_local_part.
1818 10. MIME decoding is now applied to the contents of Subject: header lines when
1821 11. Now that a reference to $sender_host_address automatically causes a reverse
1822 lookup to occur if necessary (4.13/18), there is no need to arrange for a
1823 host lookup before query-style lookups in lists that might use this
1824 variable. This has therefore been abolished, and the "net-" prefix is no
1825 longer necessary for query-style lookups.
1827 12. The Makefile for SCO_SV contained a setting of LDFLAGS. This appears to
1828 have been a typo for LFLAGS, so it has been changed.
1830 13. The install script calls Exim with "-C /dev/null" in order to find the
1831 version number. If ALT_CONFIG_PREFIX was set, this caused an error message
1832 to be output. Howeve, since Exim outputs its version number before the
1833 error, it didn't break the script. It just looked ugly. I fixed this by
1834 always allowing "-C /dev/null" if the caller is root.
1836 14. Ignore overlarge ACL variable number when reading spool file - insurance
1837 against a later release with more variables having written the file.
1839 15. The standard form for an IPv6 address literal was being rejected by EHLO.
1840 Example: [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
1841 this, as well as the form without the "IPv6" on the front.
1843 16. Added CHOWN_COMMAND=/usr/sbin/chown and LIBS=-lresolv to the
1844 OS/Makefile-Darwin file.
1846 17. Fixed typo in lookups/ldap.c: D_LOOKUP should be D_lookup. This applied
1847 only to LDAP libraries that do not have LDAP_OPT_DEREF.
1849 18. After change 4.21/52, "%ld" was used to format the contents of the $inode
1850 variable. However, some OS use ints for inodes. I've added cast to long int
1851 to get rid of the compiler warning.
1853 19. I had forgotten to lock out "/../" in configuration file names when
1854 ALT_CONFIG_PREFIX was set.
1856 20. Routers used for verification do not need to specify transports. However,
1857 if such a router generated a host list, and callout was configured, Exim
1858 crashed, because it could not find a port number from the (non-existent)
1859 transport. It now assumes port 25 in this circumstance.
1861 21. Added the -t option to exigrep.
1863 22. If LOOKUP_LSEARCH is defined, all three linear search methods (lsearch,
1864 wildlsearch, nwildlsearch) are compiled. LOOKUP_WILDLSEARCH and LOOKUP_
1865 NWILDLSEARCH are now obsolete, but retained for compatibility. If either of
1866 them is set, LOOKUP_LSEARCH is forced.
1868 23. "exim -bV" now outputs a list of lookups that are included in the binary.
1870 24. Added sender and host information to the "rejected by local_scan()" log
1871 line; previously there was no indication of these.
1873 25. Added .include_if_exists.
1875 26. Change 3.952/11 added an explicit directory sync on top of a file sync for
1876 Linux. It turns out that not all file systems support this. Apparently some
1877 versions of NFS do not. (It's rare to put Exim's spool on NFS, but people
1878 do it.) To cope with this, the error EINVAL, which means that sync-ing is
1879 not supported on the file descriptor, is now ignored when Exim is trying to
1880 sync a directory. This applies only to Linux.
1882 27. Added -DBIND_8_COMPAT to the CLFAGS setting for Darwin.
1884 28. In Darwin (MacOS X), the PAM headers are in /usr/include/pam and not in
1885 /usr/include/security. There's now a flag in OS/os.h-Darwin to cope with
1888 29. Added support for maildirsize files from supplied patch (modified a bit).
1890 30. The use of :fail: followed by an empty string could lead Exim to respond to
1891 sender verification failures with (e.g.):
1893 550 Verification failed for <xxx>
1894 550 Sender verify failed
1896 where the first response line was missing the '-' that indicates it is not
1897 the final line of the response.
1899 31. The loop for finding the name of the user that called Exim had a hardwired
1900 limit of 10; it now uses the value of finduser_retries, which is used for
1901 all other user lookups.
1903 32. Added $received_count variable, available in data and not_smtp ACLs, and at
1906 33. Exim was neglecting to zero errno before one call of strtol() when
1907 expanding a string and expecting an integer value. On some systems this
1908 resulted in spurious "integer overflow" errors. Also, it was casting the
1909 result into an int without checking.
1911 34. Testing for a connection timeout using "timeout_connect" in the retry rules
1912 did not work. The code looks as if it has *never* worked, though it appears
1913 to have been documented since at least releast 1.62. I have made it work.
1915 35. The "timeout_DNS" error in retry rules, also documented since at least
1916 1.62, also never worked. As it isn't clear exactly what this means, and
1917 clearly it isn't a major issue, I have abolished the feature by treating it
1918 as "timeout", and writing a warning to the main and panic logs.
1920 36. The display of retry rules for -brt wasn't always showing the error code
1923 37. Added new error conditions to retry rules: timeout_A, timeout_MX,
1924 timeout_connect_A, timeout_connect_MX.
1926 38. Rewriting the envelope sender at SMTP time did not allow it to be rewritten
1927 to the empty sender.
1929 39. The daemon was not analysing the content of -oX till after it had closed
1930 stderr and disconnected from the controlling terminal. This meant that any
1931 syntax errors were only noted on the panic log, and the return code from
1932 the command was 0. By re-arranging the code a little, I've made the
1933 decoding happen first, so such errors now appear on stderr, and the return
1934 code is 1. However, the actual setting up of the sockets still happens in
1935 the disconnected process, so errors there are still only recorded on the
1938 40. A daemon listener on a wildcard IPv6 socket that also accepts IPv4
1939 connections (as happens on some IP stacks) was logged at start up time as
1940 just listening for IPv6. It now logs "IPv6 with IPv4". This differentiates
1941 it from "IPv6 and IPv4", which means that two separate sockets are being
1944 41. The debug output for gethostbyname2() or getipnodebyname() failures now
1945 says whether AF_INET or AF_INET6 was passed as an argument.
1947 42. Exiwhat output was messed up when time zones were included in log
1950 43. Exiwhat now gives more information about the daemon's listening ports,
1951 and whether -tls-on-connect was used.
1953 44. The "port" option of the smtp transport is now expanded.
1955 45. A "message" modifier in a "warn" statement in a non-message ACL was being
1956 silently ignored. Now an error message is written to the main and panic
1959 46. There's a new ACL modifier called "logwrite" which writes to a log file
1960 as soon as it is encountered.
1962 47. Added $local_user_uid and $local_user_gid at routing time.
1964 48. Exim crashed when trying to verify a sender address that was being
1967 49. Exim was recognizing only a space character after ".include". It now also
1968 recognizes a tab character.
1970 50. Fixed several bugs in the Perl script that creates the exim.8 man page by
1971 extracting the relevant information from the specification. The man page no
1972 longer contains scrambled data for the -d option, and I've added a section
1973 at the front about calling Exim under different names.
1975 51. Added "extra_headers" argument to the "mail" command in filter files.
1977 52. Redirecting mail to an unqualified address in a Sieve filter caused Exim to
1980 53. Installed eximstats 1.29.
1982 54. Added transport_filter_timeout as a generic transport option.
1984 55. Exim no longer adds an empty Bcc: header to messages that have no To: or
1985 Cc: header lines. This was required by RFC 822, but it not required by RFC
1988 56. Exim used to add From:, Date:, and Message-Id: header lines to any
1989 incoming messages that did not have them. Now it does so only if the
1990 message originates locally, that is, if there is no associated remote host
1991 address. When Resent- header lines are present, this applies to the Resent-
1992 lines rather than the non-Resent- lines.
1994 57. Drop incoming SMTP connection after too many syntax or protocol errors. The
1995 limit is controlled by smtp_max_synprot_errors, defaulting to 3.
1997 58. Messages for configuration errors now include the name of the main
1998 configuration file - useful now that there may be more than one file in a
1999 list (.included file names were always shown).
2001 59. Change 4.21/82 (run initgroups() when starting the daemon) causes problems
2002 for those rare installations that do not start the daemon as root or run it
2003 setuid root. I've cut out the call to initgroups() if the daemon is not
2006 60. The Exim user and group can now be bound into the binary as text strings
2007 that are looked up at the start of Exim's processing.
2009 61. Applied a small patch for the Interbase code, supplied by Ard Biesheuvel.
2011 62. Added $mailstore_basename variable.
2013 63. Installed patch to sieve.c from Michael Haardt.
2015 64. When Exim failed to open the panic log after failing to open the main log,
2016 the original message it was trying to log was written to stderr and debug
2017 output, but if they were not available (the usual case in production), it
2018 was lost. Now it is written to syslog before the two lines that record the
2019 failures to open the logs.
2021 65. Users' Exim filters run in subprocesses under the user's uid. It is
2022 possible for a "deliver" command or an alias in a "personal" command to
2023 provoke an address rewrite. If logging of address rewriting is configured,
2024 this fails because the process is not running as root or exim. There may be
2025 a better way of dealing with this, but for the moment (because 4.30 needs
2026 to be released), I have disabled address rewrite logging when running a
2027 filter in a non-root, non-exim process.
2033 1. The buildconfig auxiliary program wasn't quoting the value set for
2034 HEADERS_CHARSET. This caused a compilation error complaining that 'ISO' was
2035 not defined. This bug was masked in 4.22 by the effect that was fixed in
2038 2. Some messages that were rejected after a message id was allocated were
2039 shown as "incomplete" by exigrep. It no longer does this for messages that
2040 are rejected by local_scan() or the DATA or non-SMTP ACLs.
2042 3. If a Message-ID: header used a domain literal in the ID, and Exim did not
2043 have allow_domain_literals set, the ID did not get logged in the <= line.
2044 Domain literals are now always recognized in Message-ID: header lines.
2046 4. The first argument for a ${extract expansion item is the key name or field
2047 number. Leading and trailing spaces in this item were not being ignored,
2048 causing some misleading effects.
2050 5. When deliver_drop_privilege was set, single queue runner processes started
2051 manually (i.e. by the command "exim -q") or by the daemon (which uses the
2052 same command in the process it spins off) were not dropping privilege.
2054 6. When the daemon running as "exim" started a queue runner, it always
2055 re-executed Exim in the spun-off process. This is a waste of effort when
2056 deliver_drop_privilege is set. The new process now just calls the
2057 queue-runner function directly.
2063 1. Typo in the src/EDITME file: it referred to HEADERS_DECODE_TO instead of
2066 2. Change 4.21/73 introduced a bug. The pid file path set by -oP was being
2067 ignored. Though the use of -oP was forcing the writing of a pid file, it
2068 was always written to the default place.
2070 3. If the message "no IP address found for host xxxx" is generated during
2071 incoming verification, it is now followed by identification of the incoming
2072 connection (so you can more easily find what provoked it).
2074 4. Bug fix for Sieve filters: "stop" inside a block was not working properly.
2076 5. Added some features to "harden" Exim a bit more against certain attacks:
2078 (a) There is now a build-time option called FIXED_NEVER_USERS that can
2079 be put in Local/Makefile. This is like the never_users runtime option,
2080 but it cannot be overridden. The default setting is "root".
2082 (b) If ALT_CONFIG_PREFIX is defined in Local/Makefile, it specifies a
2083 prefix string with which any file named in a -C command line option
2086 (c) If ALT_CONFIG_ROOT_ONLY is defined in Local/Makefile, root privilege
2087 is retained for -C and -D only if the caller of Exim is root. Without
2088 it, the exim user may also use -C and -D and retain privilege.
2090 (d) If DISABLE_D_OPTION is defined in Local/Makefile, the use of the -D
2091 command line option is disabled.
2093 6. Macro names set by the -D option must start with an upper case letter, just
2094 like macro names defined in the configuration file.
2096 7. Added "dereference=" facility to LDAP.
2098 8. Two instances of the typo "uknown" in the source files are fixed.
2100 9. If a PERL_COMMAND setting in Local/Makefile was not at the start of a line,
2101 the Configure-Makefile script screwed up while processing it.
2103 10. Incorporated PCRE 4.4.
2105 11. The SMTP synchronization check was not operating right at the start of an
2106 SMTP session. For example, it could not catch a HELO sent before the client
2107 waited for the greeting. There is now a check for outstanding input at the
2108 point when the greeting is written. Because of the duplex, asynchronous
2109 nature of TCP/IP, it cannot be perfect - the incorrect input may be on its
2110 way, but not yet received, when the check is performed.
2112 12. Added tcp_nodelay to make it possible to turn of the setting of TCP_NODELAY
2113 on TCP/IP sockets, because this apparently causes some broken clients to
2116 13. Installed revised OS/Makefile-CYGWIN and OS/os.c-cygwin (the .h file was
2117 unchanged) from the Cygwin maintainer.
2119 14. The code for -bV that shows what is in the binary showed "mbx" when maildir
2120 was supported instead of testing for mbx. Effectively a typo.
2122 15. The spa authenticator server code was not checking that the input it
2123 received was valid base64.
2125 16. The debug output line for the "set" modifier in ACLs was not showing the
2126 name of the variable that was being set.
2128 17. Code tidy: the variable type "vtype_string" was never used. Removed it.
2130 18. Previously, a reference to $sender_host_name did not cause a DNS reverse
2131 lookup on its own. Something else was needed to trigger the lookup. For
2132 example, a match in host_lookup or the need for a host name in a host list.
2133 Now, if $sender_host_name is referenced and the host name has not yet been
2134 looked up, a lookup is performed. If the lookup fails, the variable remains
2135 empty, and $host_lookup_failed is set to "1".
2137 19. Added "eqi" as a case-independent comparison operator.
2139 20. The saslauthd authentication condition could segfault if neither service
2140 nor realm was specified.
2142 21. If an overflowing value such as "2048M" was set for message_size_limit, the
2143 error message that was logged was misleading, and incoming SMTP
2144 connections were dropped. The message is now more accurate, and temporary
2145 errors are given to SMTP connections.
2147 22. In some error situations (such as 21 above) Exim rejects all SMTP commands
2148 (except RSET) with a 421 error, until QUIT is received. However, it was
2149 failing to send a response to QUIT.
2151 23. The HELO ACL was being run before the code for helo_try_verify_hosts,
2152 which made it impossible to use "verify = helo" in the HELO ACL. The HELO
2153 ACL is now run after the helo_try_verify_hosts code.
2155 24. "{MD5}" and "{SHA1}" are now recognized as equivalent to "{md5"} and
2156 "{sha1}" in the "crypteq" expansion condition (in fact the comparison is
2157 case-independent, so other case variants are also recognized). Apparently
2158 some systems use these upper case variants.
2160 25. If more than two messages were waiting for the same host, and a transport
2161 filter was specified for the transport, Exim sent two messages over the
2162 same TCP/IP connection, and then failed with "socket operation on non-
2163 socket" when it tried to send the third.
2165 26. Added Exim::debug_write and Exim::log_write for embedded Perl use.
2167 27. The extern definition of crypt16() in expand.c was not being excluded when
2168 the OS had its own crypt16() function.
2170 28. Added bounce_return_body as a new option, and bounce_return_size_limit
2171 as a preferred synonym for return_size_limit, both as an option and as an
2174 29. Added LIBS=-liconv to OS/Makefile-OSF1.
2176 30. Changed the default configuration ACL to relax the local part checking rule
2177 for addresses that are not in any local domains. For these addresses,
2178 slashes and pipe symbols are allowed within local parts, but the sequence
2179 /../ is explicitly forbidden.
2181 31. SPA server authentication was not clearing the challenge buffer before
2184 32. log_message in a "warn" ACL statement was writing to the reject log as
2185 well as to the main log, which contradicts the documentation and doesn't
2186 seem right (because no rejection is happening). So I have stopped it.
2188 33. Added Ard Biesheuvel's lookup code for accessing an Interbase database.
2189 However, I am unable to do any testing of this.
2191 34. Fixed an infelicity in the appendfile transport. When checking directories
2192 for a mailbox, to see if any needed to be created, it was accidentally
2193 using path names with one or more superfluous leading slashes; tracing
2194 would show up entries such as stat("///home/ph10", 0xFFBEEA48).
2196 35. If log_message is set on a "discard" verb in a MAIL or RCPT ACL, its
2197 contents are added to the log line that is written for every discarded
2198 recipient. (Previously a log_message setting was ignored.)
2200 36. The ${quote: operator now quotes the string if it is empty.
2202 37. The install script runs exim in order to find its version number. If for
2203 some reason other than non-existence or emptiness, which it checks, it
2204 could not run './exim', it was installing it with an empty version number,
2205 i.e. as "exim-". This error state is now caught, and the installation is
2208 38. An argument was missing from the function that creates an error message
2209 when Exim fails to connect to the socket for saslauthd authentication.
2210 This could cause Exim to crash, or give a corrupted message.
2212 39. Added isip, isip4, and isip6 to ${if conditions.
2214 40. The ACL variables $acl_xx are now saved with the message, and can be
2215 accessed later in routers, transports, and filters.
2217 41. The new lookup type nwildlsearch is like wildlsearch, except that the key
2218 strings in the file are not string-expanded.
2220 42. If a MAIL command specified a SIZE value that was too large to fit into an
2221 int variable, the check against message_size_limit failed. Such values are
2222 now forced to INT_MAX, which is around 2Gb for a 32-bit variable. Maybe one
2223 day this will have to be increased, but I don't think I want to be around
2224 when emails are that large.
2231 1. Removed HAVE_ICONV=yes from OS/Makefile-FreeBSD, since it seems that
2232 iconv() is not standard in FreeBSD.
2234 2. Change 4.21/17 was buggy and could cause stack overwriting on a system with
2235 IPv6 enabled. The observed symptom was a segmentation fault on return from
2236 the function os_common_find_running_interfaces() in src/os.c.
2238 3. In the check_special_case() function in daemon.c I had used "errno" as an
2239 argument name, which causes warnings on some systems. This was basically a
2240 typo, since it was named "eno" in the comments!
2242 4. The code that waits for the clock to tick (at a resolution of some fraction
2243 of a second) so as to ensure message-id uniqueness was always waiting for
2244 at least one whole tick, when it could have waited for less. [This is
2245 almost certainly not relevant at current processor speeds, where it is
2246 unlikely to ever wait at all. But we try to future-proof.]
2248 5. The function that sleeps for a time interval that includes fractions of a
2249 second contained a race. It did not block SIGALRM between setting the
2250 timer, and suspending (a couple of lines later). If the interval was short
2251 and the sigsuspend() was delayed until after it had expired, the suspension
2252 never ended. On busy systems this could lead to processes getting stuck for
2255 6. Some uncommon configurations may cause a lookup to happen in a queue runner
2256 process, before it forks any delivery processes. The open lookup caching
2257 mechanism meant that the open file or database connection was passed into
2258 the delivery process. The problem was that delivery processes always tidy
2259 up cached lookup data. This could cause a problem for the next delivery
2260 process started by the queue runner, because the external queue runner
2261 process does not know about the closure. So the next delivery process
2262 still has data in the lookup cache. In the case of a file lookup, there was
2263 no problem because closing a file descriptor in a subprocess doesn't affect
2264 the parent. However, if the lookup was caching a connection to a database,
2265 the connection was closed, and the second delivery process was likely to
2266 see errors such as "PGSQL: query failed: server closed the connection
2267 unexpectedly". The problem has been fixed by closing all cached lookups
2268 in a queue runner before running a delivery process.
2270 7. Compiler warning on Linux for the second argument of iconv(), which doesn't
2271 seem to have the "const" qualifier which it has on other OS. I've
2274 8. Change 4.21/2 was too strict. It is only if there are two authenticators
2275 *of the same type* (client or server) with the same public name that an
2276 error should be diagnosed.
2278 9. When Exim looked up a host name for an IP address, but failed to find the
2279 original IP address when looking up the host name (a safety check), it
2280 output the message "<ip address> does not match any IP for NULL", which was
2281 confusing, to say the least. The bug was that the host name should have
2282 appeared instead of "NULL".
2284 10. Since release 3.03, if Exim is called by a uid other than root or the Exim
2285 user that is built into the binary, and the -C or -D options is used, root
2286 privilege is dropped before the configuration file is read. In addition,
2287 logging is switched to stderr instead of the normal log files. If the
2288 configuration then re-defines the Exim user, the unprivileged environment
2289 is probably not what is expected, so Exim logs a panic warning message (but
2292 However, if deliver_drop_privilege is set, the unprivileged state may well
2293 be exactly what is intended, so the warning has been cut out in that case,
2294 and Exim is allowed to try to write to its normal log files.
2300 1. smtp_return_error_details was not giving details for temporary sender
2301 or receiver verification errors.
2303 2. Diagnose a configuration error if two authenticators have the same public
2306 3. Exim used not to create the message log file for a message until the first
2307 delivery attempt. This could be confusing when incoming messages were held
2308 for policy or load reasons. The message log file is now created at the time
2309 the message is received, and an initial "Received" line is written to it.
2311 4. The automatically generated man page for command line options had a minor
2312 bug that caused no ill effects; however, a more serious problem was that
2313 the procedure for building the man page automatically didn't always
2314 operate. Consequently, release 4.20 contains an out-of-date version. This
2315 shouldn't happen again.
2317 5. When building Exim with embedded Perl support, the script that builds the
2318 Makefile was calling 'perl' to find its compile-time parameters, ignoring
2319 any setting of PERL_COMMAND in Local/Makefile. This is now fixed.
2321 6. The freeze_tell option was not being used for messages that were frozen on
2322 arrival, either by an ACL or by local_scan().
2324 7. Added the smtp_incomplete_transaction log selector.
2326 8. After STARTTLS, Exim was not forgetting that it had advertised AUTH, so it
2327 was accepting AUTH without a new EHLO.
2329 9. Added tls_remember_esmtp to cope with YAEB. This allows AUTH and other
2330 ESMTP extensions after STARTTLS without a new EHLO, in contravention of the
2333 10. Logging of TCP/IP connections (when configured) now happens in the main
2334 daemon process instead of the child process, so that the TCP/IP connection
2335 count is more accurate (but it can never be perfect).
2337 11. The use of "drop" in a nested ACL was not being handled correctly in the
2338 outer ACL. Now, if condition failure induced by the nested "drop" causes
2339 the outer ACL verb to deny access ("accept" or "discard" after "endpass",
2340 or "require"), the connection is dropped.
2342 12. Similarly, "discard" in a nested ACL wasn't being handled. A nested ACL
2343 that yield "discard" can now be used with an "accept" or a "discard" verb,
2344 but an error is generated for any others (because I can't see a useful way
2345 to define what should happen).
2347 13. When an ACL is read dynamically from a file (or anywhere else), the lines
2348 are now processed in the same way as lines in the Exim configuration file.
2349 In particular, continuation lines are supported.
2351 14. Added the "dnslists = a.b.c!=n.n.n.n" feature.
2353 15. Added -ti meaning -t -i.
2355 16. Check for letters, digits, hyphens, and dots in the names of dnslist
2356 domains, and warn by logging if others are found.
2358 17. At least on BSD, alignment is not guarenteed for the array of ifreq's
2359 returned from GIFCONF when Exim is trying to find the list of interfaces on
2360 a host. The code in os.c has been modified to copy each ifreq to an aligned
2361 structure in all cases.
2363 Also, in some cases, the returned ifreq's were being copied to a 'struct
2364 ifreq' on the stack, which was subsequently passed to host_ntoa(). That
2365 means the last couple of bytes of an IPv6 address could be chopped if the
2366 ifreq contained only a normal sockaddr (14 bytes storage).
2368 18. Named domain lists were not supported in the hosts_treat_as_local option.
2369 An entry such as +xxxx was not recognized, and was treated as a literal
2372 19. Ensure that header lines added by a DATA ACL are included in the reject log
2373 if the ACL subsequently rejects the message.
2375 20. Upgrade the cramtest.pl utility script to use Digest::MD5 instead of just
2376 MD5 (which is deprecated).
2378 21. When testing a filter file using -bf, Exim was writing a message when it
2379 took the sender from a "From " line in the message, but it was not doing so
2380 when it took $return_path from a Return-Path: header line. It now does.
2382 22. If the contents of a "message" modifier for a "warn" ACL verb do not begin
2383 with a valid header line field name (a series of printing characters
2384 terminated by a colon, Exim now inserts X-ACL-Warn: at the beginning.
2386 23. Changed "disc" in the source to "disk" to conform to the documentation and
2387 the book and for uniformity.
2389 24. Ignore Sendmail's -Ooption=value command line item.
2391 25. When execve() failed while trying to run a command in a pipe transport,
2392 Exim was returning EX_UNAVAILBLE (69) from the subprocess. However, this
2393 could be confused with a return value of 69 from the command itself. This
2394 has been changed to 127, the value the shell returns if it is asked to run
2395 a non-existent command. The wording for the related log line suggests a
2396 non-existent command as the problem.
2398 26. If received_header_text expands to an empty string, do not add a Received:
2399 header line to the message. (Well, it adds a token one on the spool, but
2400 marks it "old" so that it doesn't get used or transmitted.)
2402 27. Installed eximstats 1.28 (addition of -nt option).
2404 28. There was no check for failure on the call to getsockname() in the daemon
2405 code. This can fail if there is a shortage of resources on the system, with
2406 ENOMEM, for example. A temporary error is now given on failure.
2408 29. Contrary to the C standard, it seems that in some environments, the
2409 equivalent of setlocale(LC_ALL, "C") is not obeyed at the start of a C
2410 program. Exim now does this explicitly; it affects the formatting of
2411 timestamps using strftime().
2413 30. If exiqsumm was given junk data, it threw up some uninitialized variable
2414 complaints. I've now initialized all the variables, to avoid this.
2416 32. Header lines added by a system filter were not being "seen" during
2417 transport-time rewrites.
2419 33. The info_callback() function passed to OpenSSL is set up with type void
2420 (*)(SSL *, int, int), as described somewhere. However, when calling the
2421 function (actually a macro) that sets it up, the type void(*)() is
2422 expected. I've put in a cast to prevent warnings from picky compilers.
2424 34. If a DNS black list lookup found a CNAME record, but there were no A
2425 records associated with the domain it pointed at, Exim crashed.
2427 35. If a DNS black list lookup returned more than one A record, Exim ignored
2428 all but the first. It now scans all returned addresses if a particular IP
2429 value is being sought. In this situation, the contents of the
2430 $dnslist_value variable are a list of all the addresses, separated by a
2433 36. Tightened up the rules for host name lookups using reverse DNS. Exim used
2434 to accept a host name and all its aliases if the forward lookup for any of
2435 them yielded the IP address of the incoming connection. Now it accepts only
2436 those names whose forward lookup yields the correct IP address. Any other
2437 names are discarded. This closes a loophole whereby a rogue DNS
2438 administrator could create reverse DNS records to break through a
2439 wildcarded host restriction in an ACL.
2441 37. If a user filter or a system filter that ran in a subprocess used any of
2442 the numerical variables ($1, $2 etc), or $thisaddress, in a pipe command,
2443 the wrong values were passed to the pipe command ($thisaddress had the
2444 value of $0, $0 had the value of $1, etc). This bug was introduced by
2445 change 4.11/101, and not discovered because I wrote an inadequate test. :-(
2447 38. Improved the line breaking for long SMTP error messages from ACLs.
2448 Previously, if there was no break point between 40 and 75 characters, Exim
2449 left the rest of the message alone. Two changes have been made: (a) I've
2450 reduced the minimum length to 35 characters; (b) if it can't find a break
2451 point between 35 and 75 characters, it looks ahead and uses the first one
2452 that it finds. This may give the occasional overlong line, but at least the
2453 remaining text gets split now.
2455 39. Change 82 of 4.11 was unimaginative. It assumed the limit on the number of
2456 file descriptors might be low, and that setting 1000 would always raise it.
2457 It turns out that in some environments, the limit is already over 1000 and
2458 that lowering it causes trouble. So now Exim takes care not to decrease it.
2460 40. When delivering a message, the value of $return_path is set to $sender_
2461 address at the start of routing (routers may change the value). By an
2462 oversight, this default was not being set up when an address was tested by
2463 -bt or -bv, which affected the outcome if any router or filter referred to
2466 41. The idea of the "warn" ACL verb is that it adds a header or writes to the
2467 log only when "message" or "log_message" are set. However, if one of the
2468 conditions was an address verification, or a call to a nested ACL, the
2469 messages generated by the underlying test were being passed through. This
2470 no longer happens. The underlying message is available in $acl_verify_
2471 message for both "message" and "log_message" expansions, so it can be
2472 passed through if needed.
2474 42. Added RFC 2047 interpretation of header lines for $h_ expansions, with a
2475 new expansion $bh_ to give the encoded byte string without charset
2476 translation. Translation happens only if iconv() is available; HAVE_ICONV
2477 indicates this at build time. HEADERS_CHARSET gives the charset to
2478 translate to; headers_charset can change it in the configuration, and
2479 "headers charset" can change it in an individual filter file.
2481 43. Now that we have a default RFC 2047 charset (see above), the code in Exim
2482 that creates RFC 2047 encoded "words" labels them as that charset instead
2483 of always using iso-8859-1. The cases are (i) the explicit ${rfc2047:
2484 expansion operator; (ii) when Exim creates a From: line for a local
2485 message; (iii) when a header line is rewritten to include a "phrase" part.
2487 44. Nasty bug in exiqsumm: the regex to skip already-delivered addresses was
2488 buggy, causing it to skip the first lines of messages whose message ID
2489 ended in 'D'. This would not have bitten before Exim release 4.14, because
2490 message IDs were unlikely to end in 'D' before then. The effect was to have
2491 incorrect size information for certain domains.
2493 45. #include "config.h" was missing at the start of the crypt16.c module. This
2494 caused trouble on Tru64 (aka OSF1) systems, because HAVE_CRYPT16 was not
2497 46. If there was a timeout during a "random" callout check, Exim treated it as
2498 a failure of the random address, and carried on sending RSET and the real
2499 address. If the delay was just some slowness somewhere, the response to the
2500 original RCPT would be taken as a response to RSET and so on, causing
2501 mayhem of various kinds.
2503 47. Change 50 for 4.20 was a heap of junk. I don't know what I was thinking
2504 when I implemented it. It didn't allow for the fact that some option values
2505 may legitimatetly be negative (e.g. size_addition), and it didn't even do
2506 the right test for positive values.
2508 48. Domain names in DNS records are case-independent. Exim always looks them up
2509 in lower case. Some resolvers return domain names in exactly the case they
2510 appear in the zone file, that is, they may contain uppercase letters. Not
2511 all resolvers do this - some return always lower case. Exim was treating a
2512 change of case by a resolver as a change of domain, similar to a widening
2513 of a domain abbreviation. This triggered its re-routing code and so it was
2514 trying to route what was effectively the same domain again. This normally
2515 caused routing to fail (because the router wouldn't handle the domain
2516 twice). Now Exim checks for this case specially, and just changes the
2517 casing of the domain that it ultimately uses when it transmits the message
2520 49. Added Sieve (RFC 3028) support, courtesy of Michael Haardt's contributed
2523 50. If a filter generated a file delivery with a non-absolute name (possible if
2524 no home directory exists for the router), the forbid_file option was not
2527 51. Added '&' feature to dnslists, to provide bit mask matching in addition to
2528 the existing equality matching.
2530 52. Exim was using ints instead of ino_t variables in some places where it was
2531 dealing with inode numbers.
2533 53. If TMPDIR is defined in Local/Makefile (default in src/EDITME is
2534 TMPDIR="/tmp"), Exim checks for the presence of an environment variable
2535 called TMPDIR, and if it finds it is different, it changes its value.
2537 54. The smtp_printf() function is now made available to local_scan() so
2538 additional output lines can be written before returning. There is also an
2539 smtp_fflush() function to enable the detection of a dropped connection.
2540 The variables smtp_input and smtp_batched_input are exported to
2543 55. Changed the default runtime configuration: the message "Unknown user"
2544 has been removed from the ACL, and instead placed on the localuser router,
2545 using the cannot_route_message feature. This means that any verification
2546 failures that generate their own messages won't get overridden. Similarly,
2547 the "Unrouteable address" message that was in the ACL for unverifiable
2548 relay addresses has also been removed.
2550 56. Added hosts_avoid_esmtp to the smtp transport.
2552 57. The exicyclog script was not checking for the esoteric option
2553 CONFIGURE_FILE_USE_EUID in the Local/Makefile. It now does this, but it
2554 will work only if exicyclog is run under the appropriate euid.
2556 58. Following a discussion on the list, the rules by which Exim recognises line
2557 endings on incoming messages have been changed. The -dropcr and drop_cr
2558 options are now no-ops, retained only for backwards compatibility. The
2559 following line terminators are recognized: LF CRLF CR. However, special
2560 processing applies to CR:
2562 (i) The sequence CR . CR does *not* terminate an incoming SMTP message,
2563 nor a local message in the state where . is a terminator.
2565 (ii) If a bare CR is encountered in a header line, an extra space is added
2566 after the line terminator so as not to end the header. The reasoning
2567 behind this is that bare CRs in header lines are most likely either
2568 to be mistakes, or people trying to play silly games.
2570 59. The size of a message, as listed by "-bp" or in the Exim monitor window,
2571 was being incorrectly given as 18 bytes larger than it should have been.
2572 This is a VOB (very old bug).
2574 60. This may never have affected anything current, but just in case it has:
2575 When the local host is found other than at the start of a list of hosts,
2576 the local host, those with the same MX, and any that follow, are discarded.
2577 When the list in question was part of a longer list of hosts, the following
2578 hosts (not currently being processed) were also being discarded. This no
2579 longer happens. I'm not sure if this situation could ever has previously
2582 61. Added the "/MX" feature to lists of hosts in the manualroute and query
2585 62. Whenever Exim generates a new message, it now adds an Auto-Submitted:
2586 header. This is something that is recommended in a new Internet Draft, and
2587 is something that is documented as being done by Sendmail. There are two
2588 possible values. For messages generated by the autoreply transport, Exim
2591 Auto-Submitted: auto-replied
2593 whereas for all other generated messages (e.g. bounces) it adds
2595 Auto-Submitted: auto-generated
2597 63. The "personal" condition in filters now includes a test for the
2598 Auto-Submitted: header. If it contains the string "auto-" the message it
2599 not considered personal.
2601 64. Added rcpt_include_affixes as a generic transport option.
2603 65. Added queue_only_override (default true).
2605 66. Added the syslog_duplication option.
2607 67. If what should have been the first header line of a message consisted of
2608 a space followed by a colon, Exim was mis-interpreting it as a header line.
2609 It isn't of course - it is syntactically invalid and should therefore be
2610 treated as the start of the message body. The misbehaviour could have
2611 caused a number of strange effects, including loss of data in subsequent
2612 header lines, and spool format errors.
2614 68. Formerly, the AUTH parameter on a MAIL command was trusted only if the
2615 client host had authenticated. This control can now be exercised by an ACL
2616 for more flexibility.
2618 69. By default, callouts do not happen when testing with -bh. There is now a
2619 variant, -bhc, which does actually run the callout code, including
2620 consulting and updating the callout cache.
2622 70. Added support for saslauthd authentication, courtesy of Alexander
2625 71. If statvfs() failed on the spool or log directories while checking their
2626 size for availability, Exim confusingly gave the error "space shortage".
2627 Furthermore, in debugging mode it crashed with a floating point exception.
2628 These checks are done if check_{spool,log}_{space,inodes} are set, and when
2629 an SMTP message arrives with SIZE= on the MAIL command. As this is a really
2630 serious problem, Exim now writes to the main and panic logs when this
2631 happens, with details of the failure. It then refuses to accept the
2632 incoming message, giving the message "spool directory problem" or "log
2633 directory problem" with a 421 code for SMTP messages.
2635 72. When Exim is about to re-exec itself, it ensures that the file descriptors
2636 0, 1, and 2 exist, because some OS complain for execs without them (see
2637 ChangeLog 4.05/30). If necessary, Exim opens /dev/null to use for these
2638 descriptors. However, the code omitted to check that the open succeeded,
2639 causing mysterious errors if for some reason the permissions on /dev/null
2640 got screwed. Now Exim writes a message to the main and panic logs, and
2641 bombs out if it can't open /dev/null.
2643 73. Re-vamped the way daemon_smtp_port, local_interfaces, and -oX work and
2644 interact so that it is all more flexible. It is supposed to remain
2645 backwards compatible. Also added extra_local_interfaces.
2647 74. Invalid data sent to a SPA (NTLM) server authenticator could cause the code
2648 to bomb out with an assertion failure - to the client this appears as a
2649 connection drop. This problem occurs in the part of the code that was taken
2650 from the Samba project. Fortunately, the assertion is in a very simple
2651 function, so I have fixed this by reproducing the function inline in the
2652 one place where it is called, and arranging for authentication to fail
2653 instead of killing the process with assert().
2655 75. The SPA client code was not working when the server requested OEM rather
2656 than Unicode encoding.
2658 76. Added code to make require_files with a specific uid setting more usable in
2659 the case where statting the file as root fails - usually a non-root-mounted
2660 NFS file system. When this happens and the failure is EACCES, Exim now
2661 forks a subprocess and does the per-uid checking as the relevant uid.
2663 77. Added process_log_path.
2665 78. If log_file_path was not explicitly set, a setting of check_log_space or
2666 check_log_inodes was ignored.
2668 79. If a space check for the spool or log partitions fails, the incident is now
2669 logged. Of course, in the latter case the data may get lost...
2671 80. Added the %p formatting code to string_format() so that it can be used to
2672 print addresses in debug_print(). Adjusted all the address printing in the
2673 debugging in store.c to use %p rather than %d.
2675 81. There was a concern that a line of code in smtp_in.c could overflow a
2676 buffer if a HELO/EHLO command was given followed by 500 or so spaces. As
2677 initially expressed, the concern was not well-founded, because trailing
2678 spaces are removed early. However, if the trailing spaces were followed by
2679 a NULL, they did not get removed, so the overflow was possible. Two fixes
2682 (a) I re-wrote the offending code in a cleaner fashion.
2683 (b) If an incoming SMTP command contains a NULL character, it is rejected
2686 82. When Exim changes uid/gid to the Exim user at daemon start time, it now
2687 runs initgroups(), so that if the Exim user is in any additional groups,
2688 they will be used during message reception.
2694 The change log for 4.20 and earlier releases has been archived.
git://git.exim.org / users / heiko / exim.git / blob