89c5dc0030b8857e1aed31489eb7c94208d34e65
[exim.git] / src / src / log.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 /* Functions for writing log files. The code for maintaining datestamped
9 log files was originally contributed by Tony Sheen. */
10
11
12 #include "exim.h"
13
14 #define LOG_NAME_SIZE 256
15 #define MAX_SYSLOG_LEN 870
16
17 #define LOG_MODE_FILE 1
18 #define LOG_MODE_SYSLOG 2
19
20 enum { lt_main, lt_reject, lt_panic, lt_debug };
21
22 static uschar *log_names[] = { US"main", US"reject", US"panic", US"debug" };
23
24
25
26 /*************************************************
27 * Local static variables *
28 *************************************************/
29
30 static uschar mainlog_name[LOG_NAME_SIZE];
31 static uschar rejectlog_name[LOG_NAME_SIZE];
32 static uschar debuglog_name[LOG_NAME_SIZE];
33
34 static uschar *mainlog_datestamp = NULL;
35 static uschar *rejectlog_datestamp = NULL;
36
37 static int mainlogfd = -1;
38 static int rejectlogfd = -1;
39 static ino_t mainlog_inode = 0;
40 static ino_t rejectlog_inode = 0;
41
42 static uschar *panic_save_buffer = NULL;
43 static BOOL panic_recurseflag = FALSE;
44
45 static BOOL syslog_open = FALSE;
46 static BOOL path_inspected = FALSE;
47 static int logging_mode = LOG_MODE_FILE;
48 static uschar *file_path = US"";
49
50 static size_t pid_position[2];
51
52
53 /* These should be kept in-step with the private delivery error
54 number definitions in macros.h */
55
56 static const uschar * exim_errstrings[] = {
57 US"",
58 US"unknown error",
59 US"user slash",
60 US"exist race",
61 US"not regular",
62 US"not directory",
63 US"bad ugid",
64 US"bad mode",
65 US"inode changed",
66 US"lock failed",
67 US"bad address2",
68 US"forbid pipe",
69 US"forbid file",
70 US"forbid reply",
71 US"missing pipe",
72 US"missing file",
73 US"missing reply",
74 US"bad redirect",
75 US"smtp closed",
76 US"smtp format",
77 US"spool format",
78 US"not absolute",
79 US"Exim-imposed quota",
80 US"held",
81 US"Delivery filter process failure",
82 US"Delivery add/remove header failure",
83 US"Delivery write incomplete error",
84 US"Some expansion failed",
85 US"Failed to get gid",
86 US"Failed to get uid",
87 US"Unset or non-existent transport",
88 US"MBX length mismatch",
89 US"Lookup failed routing or in smtp tpt",
90 US"Can't match format in appendfile",
91 US"Creation outside home in appendfile",
92 US"Can't check a list; lookup defer",
93 US"DNS lookup defer",
94 US"Failed to start TLS session",
95 US"Mandatory TLS session not started",
96 US"Failed to chown a file",
97 US"Failed to create a pipe",
98 US"When verifying",
99 US"When required by client",
100 US"Used internally in smtp transport",
101 US"RCPT gave 4xx error",
102 US"MAIL gave 4xx error",
103 US"DATA gave 4xx error",
104 US"Negotiation failed for proxy configured host",
105 US"Authenticator 'other' failure",
106 US"target not supporting SMTPUTF8",
107 US"",
108
109 US"Not time for routing",
110 US"Not time for local delivery",
111 US"Not time for any remote host",
112 US"Local-only delivery",
113 US"Domain in queue_domains",
114 US"Transport concurrency limit",
115 US"Event requests alternate response",
116 };
117
118
119 /************************************************/
120 const uschar *
121 exim_errstr(int err)
122 {
123 return err < 0 ? exim_errstrings[-err] : CUS strerror(err);
124 }
125
126 /*************************************************
127 * Write to syslog *
128 *************************************************/
129
130 /* The given string is split into sections according to length, or at embedded
131 newlines, and syslogged as a numbered sequence if it is overlong or if there is
132 more than one line. However, if we are running in the test harness, do not do
133 anything. (The test harness doesn't use syslog - for obvious reasons - but we
134 can get here if there is a failure to open the panic log.)
135
136 Arguments:
137 priority syslog priority
138 s the string to be written
139
140 Returns: nothing
141 */
142
143 static void
144 write_syslog(int priority, const uschar *s)
145 {
146 int len;
147 int linecount = 0;
148
149 if (!syslog_pid && LOGGING(pid))
150 s = string_sprintf("%.*s%s", (int)pid_position[0], s, s + pid_position[1]);
151 if (!syslog_timestamp)
152 {
153 len = log_timezone ? 26 : 20;
154 if (LOGGING(millisec)) len += 4;
155 s += len;
156 }
157
158 len = Ustrlen(s);
159
160 #ifndef NO_OPENLOG
161 if (!syslog_open && !f.running_in_test_harness)
162 {
163 # ifdef SYSLOG_LOG_PID
164 openlog(CS syslog_processname, LOG_PID|LOG_CONS, syslog_facility);
165 # else
166 openlog(CS syslog_processname, LOG_CONS, syslog_facility);
167 # endif
168 syslog_open = TRUE;
169 }
170 #endif
171
172 /* First do a scan through the message in order to determine how many lines
173 it is going to end up as. Then rescan to output it. */
174
175 for (int pass = 0; pass < 2; pass++)
176 {
177 const uschar * ss = s;
178 for (int i = 1, tlen = len; tlen > 0; i++)
179 {
180 int plen = tlen;
181 uschar *nlptr = Ustrchr(ss, '\n');
182 if (nlptr != NULL) plen = nlptr - ss;
183 #ifndef SYSLOG_LONG_LINES
184 if (plen > MAX_SYSLOG_LEN) plen = MAX_SYSLOG_LEN;
185 #endif
186 tlen -= plen;
187 if (ss[plen] == '\n') tlen--; /* chars left */
188
189 if (pass == 0)
190 linecount++;
191 else if (f.running_in_test_harness)
192 if (linecount == 1)
193 fprintf(stderr, "SYSLOG: '%.*s'\n", plen, ss);
194 else
195 fprintf(stderr, "SYSLOG: '[%d%c%d] %.*s'\n", i,
196 ss[plen] == '\n' && tlen != 0 ? '\\' : '/',
197 linecount, plen, ss);
198 else
199 if (linecount == 1)
200 syslog(priority, "%.*s", plen, ss);
201 else
202 syslog(priority, "[%d%c%d] %.*s", i,
203 ss[plen] == '\n' && tlen != 0 ? '\\' : '/',
204 linecount, plen, ss);
205
206 ss += plen;
207 if (*ss == '\n') ss++;
208 }
209 }
210 }
211
212
213
214 /*************************************************
215 * Die tidily *
216 *************************************************/
217
218 /* This is called when Exim is dying as a result of something going wrong in
219 the logging, or after a log call with LOG_PANIC_DIE set. Optionally write a
220 message to debug_file or a stderr file, if they exist. Then, if in the middle
221 of accepting a message, throw it away tidily by calling receive_bomb_out();
222 this will attempt to send an SMTP response if appropriate. Passing NULL as the
223 first argument stops it trying to run the NOTQUIT ACL (which might try further
224 logging and thus cause problems). Otherwise, try to close down an outstanding
225 SMTP call tidily.
226
227 Arguments:
228 s1 Error message to write to debug_file and/or stderr and syslog
229 s2 Error message for any SMTP call that is in progress
230 Returns: The function does not return
231 */
232
233 static void
234 die(uschar *s1, uschar *s2)
235 {
236 if (s1)
237 {
238 write_syslog(LOG_CRIT, s1);
239 if (debug_file) debug_printf("%s\n", s1);
240 if (log_stderr && log_stderr != debug_file)
241 fprintf(log_stderr, "%s\n", s1);
242 }
243 if (f.receive_call_bombout) receive_bomb_out(NULL, s2); /* does not return */
244 if (smtp_input) smtp_closedown(s2);
245 exim_exit(EXIT_FAILURE, NULL);
246 }
247
248
249
250 /*************************************************
251 * Create a log file *
252 *************************************************/
253
254 /* This function is called to create and open a log file. It may be called in a
255 subprocess when the original process is root.
256
257 Arguments:
258 name the file name
259
260 The file name has been build in a working buffer, so it is permissible to
261 overwrite it temporarily if it is necessary to create the directory.
262
263 Returns: a file descriptor, or < 0 on failure (errno set)
264 */
265
266 int
267 log_create(uschar *name)
268 {
269 int fd = Uopen(name,
270 #ifdef O_CLOEXEC
271 O_CLOEXEC |
272 #endif
273 O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
274
275 /* If creation failed, attempt to build a log directory in case that is the
276 problem. */
277
278 if (fd < 0 && errno == ENOENT)
279 {
280 BOOL created;
281 uschar *lastslash = Ustrrchr(name, '/');
282 *lastslash = 0;
283 created = directory_make(NULL, name, LOG_DIRECTORY_MODE, FALSE);
284 DEBUG(D_any) debug_printf("%s log directory %s\n",
285 created ? "created" : "failed to create", name);
286 *lastslash = '/';
287 if (created) fd = Uopen(name,
288 #ifdef O_CLOEXEC
289 O_CLOEXEC |
290 #endif
291 O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
292 }
293
294 return fd;
295 }
296
297
298
299 /*************************************************
300 * Create a log file as the exim user *
301 *************************************************/
302
303 /* This function is called when we are root to spawn an exim:exim subprocess
304 in which we can create a log file. It must be signal-safe since it is called
305 by the usr1_handler().
306
307 Arguments:
308 name the file name
309
310 Returns: a file descriptor, or < 0 on failure (errno set)
311 */
312
313 int
314 log_create_as_exim(uschar *name)
315 {
316 pid_t pid = exim_fork(US"logfile create");
317 int status = 1;
318 int fd = -1;
319
320 /* In the subprocess, change uid/gid and do the creation. Return 0 from the
321 subprocess on success. If we don't check for setuid failures, then the file
322 can be created as root, so vulnerabilities which cause setuid to fail mean
323 that the Exim user can use symlinks to cause a file to be opened/created as
324 root. We always open for append, so can't nuke existing content but it would
325 still be Rather Bad. */
326
327 if (pid == 0)
328 {
329 if (setgid(exim_gid) < 0)
330 die(US"exim: setgid for log-file creation failed, aborting",
331 US"Unexpected log failure, please try later");
332 if (setuid(exim_uid) < 0)
333 die(US"exim: setuid for log-file creation failed, aborting",
334 US"Unexpected log failure, please try later");
335 _exit((log_create(name) < 0)? 1 : 0);
336 }
337
338 /* If we created a subprocess, wait for it. If it succeeded, try the open. */
339
340 while (pid > 0 && waitpid(pid, &status, 0) != pid);
341 if (status == 0) fd = Uopen(name,
342 #ifdef O_CLOEXEC
343 O_CLOEXEC |
344 #endif
345 O_APPEND|O_WRONLY, LOG_MODE);
346
347 /* If we failed to create a subprocess, we are in a bad way. We return
348 with fd still < 0, and errno set, letting the caller handle the error. */
349
350 return fd;
351 }
352
353
354
355
356 /*************************************************
357 * Open a log file *
358 *************************************************/
359
360 /* This function opens one of a number of logs, creating the log directory if
361 it does not exist. This may be called recursively on failure, in order to open
362 the panic log.
363
364 The directory is in the static variable file_path. This is static so that it
365 the work of sorting out the path is done just once per Exim process.
366
367 Exim is normally configured to avoid running as root wherever possible, the log
368 files must be owned by the non-privileged exim user. To ensure this, first try
369 an open without O_CREAT - most of the time this will succeed. If it fails, try
370 to create the file; if running as root, this must be done in a subprocess to
371 avoid races.
372
373 Arguments:
374 fd where to return the resulting file descriptor
375 type lt_main, lt_reject, lt_panic, or lt_debug
376 tag optional tag to include in the name (only hooked up for debug)
377
378 Returns: nothing
379 */
380
381 static void
382 open_log(int *fd, int type, uschar *tag)
383 {
384 uid_t euid;
385 BOOL ok, ok2;
386 uschar buffer[LOG_NAME_SIZE];
387
388 /* The names of the log files are controlled by file_path. The panic log is
389 written to the same directory as the main and reject logs, but its name does
390 not have a datestamp. The use of datestamps is indicated by %D/%M in file_path.
391 When opening the panic log, if %D or %M is present, we remove the datestamp
392 from the generated name; if it is at the start, remove a following
393 non-alphanumeric character as well; otherwise, remove a preceding
394 non-alphanumeric character. This is definitely kludgy, but it sort of does what
395 people want, I hope. */
396
397 ok = string_format(buffer, sizeof(buffer), CS file_path, log_names[type]);
398
399 /* Save the name of the mainlog for rollover processing. Without a datestamp,
400 it gets statted to see if it has been cycled. With a datestamp, the datestamp
401 will be compared. The static slot for saving it is the same size as buffer,
402 and the text has been checked above to fit, so this use of strcpy() is OK. */
403
404 if (type == lt_main && string_datestamp_offset >= 0)
405 {
406 Ustrcpy(mainlog_name, buffer);
407 mainlog_datestamp = mainlog_name + string_datestamp_offset;
408 }
409
410 /* Ditto for the reject log */
411
412 else if (type == lt_reject && string_datestamp_offset >= 0)
413 {
414 Ustrcpy(rejectlog_name, buffer);
415 rejectlog_datestamp = rejectlog_name + string_datestamp_offset;
416 }
417
418 /* and deal with the debug log (which keeps the datestamp, but does not
419 update it) */
420
421 else if (type == lt_debug)
422 {
423 Ustrcpy(debuglog_name, buffer);
424 if (tag)
425 {
426 /* this won't change the offset of the datestamp */
427 ok2 = string_format(buffer, sizeof(buffer), "%s%s",
428 debuglog_name, tag);
429 if (ok2)
430 Ustrcpy(debuglog_name, buffer);
431 }
432 }
433
434 /* Remove any datestamp if this is the panic log. This is rare, so there's no
435 need to optimize getting the datestamp length. We remove one non-alphanumeric
436 char afterwards if at the start, otherwise one before. */
437
438 else if (string_datestamp_offset >= 0)
439 {
440 uschar * from = buffer + string_datestamp_offset;
441 uschar * to = from + string_datestamp_length;
442
443 if (from == buffer || from[-1] == '/')
444 {
445 if (!isalnum(*to)) to++;
446 }
447 else
448 if (!isalnum(from[-1])) from--;
449
450 /* This copy is ok, because we know that to is a substring of from. But
451 due to overlap we must use memmove() not Ustrcpy(). */
452 memmove(from, to, Ustrlen(to)+1);
453 }
454
455 /* If the file name is too long, it is an unrecoverable disaster */
456
457 if (!ok)
458 die(US"exim: log file path too long: aborting",
459 US"Logging failure; please try later");
460
461 /* We now have the file name. Try to open an existing file. After a successful
462 open, arrange for automatic closure on exec(), and then return. */
463
464 *fd = Uopen(buffer,
465 #ifdef O_CLOEXEC
466 O_CLOEXEC |
467 #endif
468 O_APPEND|O_WRONLY, LOG_MODE);
469
470 if (*fd >= 0)
471 {
472 #ifndef O_CLOEXEC
473 (void)fcntl(*fd, F_SETFD, fcntl(*fd, F_GETFD) | FD_CLOEXEC);
474 #endif
475 return;
476 }
477
478 /* Open was not successful: try creating the file. If this is a root process,
479 we must do the creating in a subprocess set to exim:exim in order to ensure
480 that the file is created with the right ownership. Otherwise, there can be a
481 race if another Exim process is trying to write to the log at the same time.
482 The use of SIGUSR1 by the exiwhat utility can provoke a lot of simultaneous
483 writing. */
484
485 euid = geteuid();
486
487 /* If we are already running as the Exim user (even if that user is root),
488 we can go ahead and create in the current process. */
489
490 if (euid == exim_uid) *fd = log_create(buffer);
491
492 /* Otherwise, if we are root, do the creation in an exim:exim subprocess. If we
493 are neither exim nor root, creation is not attempted. */
494
495 else if (euid == root_uid) *fd = log_create_as_exim(buffer);
496
497 /* If we now have an open file, set the close-on-exec flag and return. */
498
499 if (*fd >= 0)
500 {
501 #ifndef O_CLOEXEC
502 (void)fcntl(*fd, F_SETFD, fcntl(*fd, F_GETFD) | FD_CLOEXEC);
503 #endif
504 return;
505 }
506
507 /* Creation failed. There are some circumstances in which we get here when
508 the effective uid is not root or exim, which is the problem. (For example, a
509 non-setuid binary with log_arguments set, called in certain ways.) Rather than
510 just bombing out, force the log to stderr and carry on if stderr is available.
511 */
512
513 if (euid != root_uid && euid != exim_uid && log_stderr)
514 {
515 *fd = fileno(log_stderr);
516 return;
517 }
518
519 /* Otherwise this is a disaster. This call is deliberately ONLY to the panic
520 log. If possible, save a copy of the original line that was being logged. If we
521 are recursing (can't open the panic log either), the pointer will already be
522 set. Also, when we had to use a subprocess for the create we didn't retrieve
523 errno from it, so get the error from the open attempt above (which is often
524 meaningful enough, so leave it). */
525
526 if (!panic_save_buffer)
527 if ((panic_save_buffer = US malloc(LOG_BUFFER_SIZE)))
528 memcpy(panic_save_buffer, log_buffer, LOG_BUFFER_SIZE);
529
530 log_write(0, LOG_PANIC_DIE, "Cannot open %s log file \"%s\": %s: "
531 "euid=%d egid=%d", log_names[type], buffer, strerror(errno), euid, getegid());
532 /* Never returns */
533 }
534
535
536 static void
537 unlink_log(int type)
538 {
539 if (type == lt_debug) unlink(CS debuglog_name);
540 }
541
542
543
544 /*************************************************
545 * Add configuration file info to log line *
546 *************************************************/
547
548 /* This is put in a function because it's needed twice (once for debugging,
549 once for real).
550
551 Arguments:
552 ptr pointer to the end of the line we are building
553 flags log flags
554
555 Returns: updated pointer
556 */
557
558 static gstring *
559 log_config_info(gstring * g, int flags)
560 {
561 g = string_cat(g, US"Exim configuration error");
562
563 if (flags & (LOG_CONFIG_FOR & ~LOG_CONFIG))
564 return string_cat(g, US" for ");
565
566 if (flags & (LOG_CONFIG_IN & ~LOG_CONFIG))
567 g = string_fmt_append(g, " in line %d of %s", config_lineno, config_filename);
568
569 return string_catn(g, US":\n ", 4);
570 }
571
572
573 /*************************************************
574 * A write() operation failed *
575 *************************************************/
576
577 /* This function is called when write() fails on anything other than the panic
578 log, which can happen if a disk gets full or a file gets too large or whatever.
579 We try to save the relevant message in the panic_save buffer before crashing
580 out.
581
582 The potential invoker should probably not call us for EINTR -1 writes. But
583 otherwise, short writes are bad as we don't do non-blocking writes to fds
584 subject to flow control. (If we do, that's new and the logic of this should
585 be reconsidered).
586
587 Arguments:
588 name the name of the log being written
589 length the string length being written
590 rc the return value from write()
591
592 Returns: does not return
593 */
594
595 static void
596 log_write_failed(uschar *name, int length, int rc)
597 {
598 int save_errno = errno;
599
600 if (!panic_save_buffer)
601 if ((panic_save_buffer = US malloc(LOG_BUFFER_SIZE)))
602 memcpy(panic_save_buffer, log_buffer, LOG_BUFFER_SIZE);
603
604 log_write(0, LOG_PANIC_DIE, "failed to write to %s: length=%d result=%d "
605 "errno=%d (%s)", name, length, rc, save_errno,
606 (save_errno == 0)? "write incomplete" : strerror(save_errno));
607 /* Never returns */
608 }
609
610
611
612 /*************************************************
613 * Write to an fd, retrying after signals *
614 *************************************************/
615
616 /* Basic write to fd for logs, handling EINTR.
617
618 Arguments:
619 fd the fd to write to
620 buf the string to write
621 length the string length being written
622
623 Returns:
624 length actually written, persisting an errno from write()
625 */
626 ssize_t
627 write_to_fd_buf(int fd, const uschar *buf, size_t length)
628 {
629 ssize_t wrote;
630 size_t total_written = 0;
631 const uschar *p = buf;
632 size_t left = length;
633
634 while (1)
635 {
636 wrote = write(fd, p, left);
637 if (wrote == (ssize_t)-1)
638 {
639 if (errno == EINTR) continue;
640 return wrote;
641 }
642 total_written += wrote;
643 if (wrote == left)
644 break;
645 else
646 {
647 p += wrote;
648 left -= wrote;
649 }
650 }
651 return total_written;
652 }
653
654
655
656 static void
657 set_file_path(void)
658 {
659 int sep = ':'; /* Fixed separator - outside use */
660 uschar *t;
661 const uschar *tt = US LOG_FILE_PATH;
662 while ((t = string_nextinlist(&tt, &sep, log_buffer, LOG_BUFFER_SIZE)))
663 {
664 if (Ustrcmp(t, "syslog") == 0 || t[0] == 0) continue;
665 file_path = string_copy(t);
666 break;
667 }
668 }
669
670
671 void
672 mainlog_close(void)
673 {
674 if (mainlogfd < 0) return;
675 (void)close(mainlogfd);
676 mainlogfd = -1;
677 mainlog_inode = 0;
678 }
679
680 /*************************************************
681 * Write message to log file *
682 *************************************************/
683
684 /* Exim can be configured to log to local files, or use syslog, or both. This
685 is controlled by the setting of log_file_path. The following cases are
686 recognized:
687
688 log_file_path = "" write files in the spool/log directory
689 log_file_path = "xxx" write files in the xxx directory
690 log_file_path = "syslog" write to syslog
691 log_file_path = "syslog : xxx" write to syslog and to files (any order)
692
693 The message always gets '\n' added on the end of it, since more than one
694 process may be writing to the log at once and we don't want intermingling to
695 happen in the middle of lines. To be absolutely sure of this we write the data
696 into a private buffer and then put it out in a single write() call.
697
698 The flags determine which log(s) the message is written to, or for syslogging,
699 which priority to use, and in the case of the panic log, whether the process
700 should die afterwards.
701
702 The variable really_exim is TRUE only when exim is running in privileged state
703 (i.e. not with a changed configuration or with testing options such as -brw).
704 If it is not, don't try to write to the log because permission will probably be
705 denied.
706
707 Avoid actually writing to the logs when exim is called with -bv or -bt to
708 test an address, but take other actions, such as panicking.
709
710 In Exim proper, the buffer for building the message is got at start-up, so that
711 nothing gets done if it can't be got. However, some functions that are also
712 used in utilities occasionally obey log_write calls in error situations, and it
713 is simplest to put a single malloc() here rather than put one in each utility.
714 Malloc is used directly because the store functions may call log_write().
715
716 If a message_id exists, we include it after the timestamp.
717
718 Arguments:
719 selector write to main log or LOG_INFO only if this value is zero, or if
720 its bit is set in log_selector[0]
721 flags each bit indicates some independent action:
722 LOG_SENDER add raw sender to the message
723 LOG_RECIPIENTS add raw recipients list to message
724 LOG_CONFIG add "Exim configuration error"
725 LOG_CONFIG_FOR add " for " instead of ":\n "
726 LOG_CONFIG_IN add " in line x[ of file y]"
727 LOG_MAIN write to main log or syslog LOG_INFO
728 LOG_REJECT write to reject log or syslog LOG_NOTICE
729 LOG_PANIC write to panic log or syslog LOG_ALERT
730 LOG_PANIC_DIE write to panic log or LOG_ALERT and then crash
731 format a printf() format
732 ... arguments for format
733
734 Returns: nothing
735 */
736
737 void
738 log_write(unsigned int selector, int flags, const char *format, ...)
739 {
740 int paniclogfd;
741 ssize_t written_len;
742 gstring gs = { .size = LOG_BUFFER_SIZE-1, .ptr = 0, .s = log_buffer };
743 gstring * g;
744 va_list ap;
745
746 /* If panic_recurseflag is set, we have failed to open the panic log. This is
747 the ultimate disaster. First try to write the message to a debug file and/or
748 stderr and also to syslog. If panic_save_buffer is not NULL, it contains the
749 original log line that caused the problem. Afterwards, expire. */
750
751 if (panic_recurseflag)
752 {
753 uschar *extra = panic_save_buffer ? panic_save_buffer : US"";
754 if (debug_file) debug_printf("%s%s", extra, log_buffer);
755 if (log_stderr && log_stderr != debug_file)
756 fprintf(log_stderr, "%s%s", extra, log_buffer);
757 if (*extra) write_syslog(LOG_CRIT, extra);
758 write_syslog(LOG_CRIT, log_buffer);
759 die(US"exim: could not open panic log - aborting: see message(s) above",
760 US"Unexpected log failure, please try later");
761 }
762
763 /* Ensure we have a buffer (see comment above); this should never be obeyed
764 when running Exim proper, only when running utilities. */
765
766 if (!log_buffer)
767 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
768 {
769 fprintf(stderr, "exim: failed to get store for log buffer\n");
770 exim_exit(EXIT_FAILURE, NULL);
771 }
772
773 /* If we haven't already done so, inspect the setting of log_file_path to
774 determine whether to log to files and/or to syslog. Bits in logging_mode
775 control this, and for file logging, the path must end up in file_path. This
776 variable must be in permanent store because it may be required again later in
777 the process. */
778
779 if (!path_inspected)
780 {
781 BOOL multiple = FALSE;
782 int old_pool = store_pool;
783
784 store_pool = POOL_PERM;
785
786 /* If nothing has been set, don't waste effort... the default values for the
787 statics are file_path="" and logging_mode = LOG_MODE_FILE. */
788
789 if (*log_file_path)
790 {
791 int sep = ':'; /* Fixed separator - outside use */
792 uschar *s;
793 const uschar *ss = log_file_path;
794
795 logging_mode = 0;
796 while ((s = string_nextinlist(&ss, &sep, log_buffer, LOG_BUFFER_SIZE)))
797 {
798 if (Ustrcmp(s, "syslog") == 0)
799 logging_mode |= LOG_MODE_SYSLOG;
800 else if (logging_mode & LOG_MODE_FILE)
801 multiple = TRUE;
802 else
803 {
804 logging_mode |= LOG_MODE_FILE;
805
806 /* If a non-empty path is given, use it */
807
808 if (*s)
809 file_path = string_copy(s);
810
811 /* If the path is empty, we want to use the first non-empty, non-
812 syslog item in LOG_FILE_PATH, if there is one, since the value of
813 log_file_path may have been set at runtime. If there is no such item,
814 use the ultimate default in the spool directory. */
815
816 else
817 set_file_path(); /* Empty item in log_file_path */
818 } /* First non-syslog item in log_file_path */
819 } /* Scan of log_file_path */
820 }
821
822 /* If no modes have been selected, it is a major disaster */
823
824 if (logging_mode == 0)
825 die(US"Neither syslog nor file logging set in log_file_path",
826 US"Unexpected logging failure");
827
828 /* Set up the ultimate default if necessary. Then revert to the old store
829 pool, and record that we've sorted out the path. */
830
831 if (logging_mode & LOG_MODE_FILE && !file_path[0])
832 file_path = string_sprintf("%s/log/%%slog", spool_directory);
833 store_pool = old_pool;
834 path_inspected = TRUE;
835
836 /* If more than one file path was given, log a complaint. This recursive call
837 should work since we have now set up the routing. */
838
839 if (multiple)
840 log_write(0, LOG_MAIN|LOG_PANIC,
841 "More than one path given in log_file_path: using %s", file_path);
842 }
843
844 /* If debugging, show all log entries, but don't show headers. Do it all
845 in one go so that it doesn't get split when multi-processing. */
846
847 DEBUG(D_any|D_v)
848 {
849 int i;
850
851 g = string_catn(&gs, US"LOG:", 4);
852
853 /* Show the selector that was passed into the call. */
854
855 for (i = 0; i < log_options_count; i++)
856 {
857 unsigned int bitnum = log_options[i].bit;
858 if (bitnum < BITWORDSIZE && selector == BIT(bitnum))
859 g = string_fmt_append(g, " %s", log_options[i].name);
860 }
861
862 g = string_fmt_append(g, "%s%s%s%s\n ",
863 flags & LOG_MAIN ? " MAIN" : "",
864 flags & LOG_PANIC ? " PANIC" : "",
865 (flags & LOG_PANIC_DIE) == LOG_PANIC_DIE ? " DIE" : "",
866 flags & LOG_REJECT ? " REJECT" : "");
867
868 if (flags & LOG_CONFIG) g = log_config_info(g, flags);
869
870 /* We want to be able to log tainted info, but log_buffer is directly
871 malloc'd. So use deliberately taint-nonchecking routines to build into
872 it, trusting that we will never expand the results. */
873
874 va_start(ap, format);
875 i = g->ptr;
876 if (!string_vformat(g, SVFMT_TAINT_NOCHK, format, ap))
877 {
878 g->ptr = i;
879 g = string_cat(g, US"**** log string overflowed log buffer ****");
880 }
881 va_end(ap);
882
883 g->size = LOG_BUFFER_SIZE;
884 g = string_catn(g, US"\n", 1);
885 debug_printf("%s", string_from_gstring(g));
886
887 gs.size = LOG_BUFFER_SIZE-1; /* Having used the buffer for debug output, */
888 gs.ptr = 0; /* reset it for the real use. */
889 gs.s = log_buffer;
890 }
891 /* If no log file is specified, we are in a mess. */
892
893 if (!(flags & (LOG_MAIN|LOG_PANIC|LOG_REJECT)))
894 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "log_write called with no log "
895 "flags set");
896
897 /* There are some weird circumstances in which logging is disabled. */
898
899 if (f.disable_logging)
900 {
901 DEBUG(D_any) debug_printf("log writing disabled\n");
902 return;
903 }
904
905 /* Handle disabled reject log */
906
907 if (!write_rejectlog) flags &= ~LOG_REJECT;
908
909 /* Create the main message in the log buffer. Do not include the message id
910 when called by a utility. */
911
912 g = string_fmt_append(&gs, "%s ", tod_stamp(tod_log));
913
914 if (LOGGING(pid))
915 {
916 if (!syslog_pid) pid_position[0] = g->ptr; /* remember begin … */
917 g = string_fmt_append(g, "[%d] ", (int)getpid());
918 if (!syslog_pid) pid_position[1] = g->ptr; /* … and end+1 of the PID */
919 }
920
921 if (f.really_exim && message_id[0] != 0)
922 g = string_fmt_append(g, "%s ", message_id);
923
924 if (flags & LOG_CONFIG)
925 g = log_config_info(g, flags);
926
927 va_start(ap, format);
928 {
929 int i = g->ptr;
930
931 /* We want to be able to log tainted info, but log_buffer is directly
932 malloc'd. So use deliberately taint-nonchecking routines to build into
933 it, trusting that we will never expand the results. */
934
935 if (!string_vformat(g, SVFMT_TAINT_NOCHK, format, ap))
936 {
937 g->ptr = i;
938 g = string_cat(g, US"**** log string overflowed log buffer ****\n");
939 }
940 }
941 va_end(ap);
942
943 /* Add the raw, unrewritten, sender to the message if required. This is done
944 this way because it kind of fits with LOG_RECIPIENTS. */
945
946 if ( flags & LOG_SENDER
947 && g->ptr < LOG_BUFFER_SIZE - 10 - Ustrlen(raw_sender))
948 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " from <%s>", raw_sender);
949
950 /* Add list of recipients to the message if required; the raw list,
951 before rewriting, was saved in raw_recipients. There may be none, if an ACL
952 discarded them all. */
953
954 if ( flags & LOG_RECIPIENTS
955 && g->ptr < LOG_BUFFER_SIZE - 6
956 && raw_recipients_count > 0)
957 {
958 int i;
959 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " for", NULL);
960 for (i = 0; i < raw_recipients_count; i++)
961 {
962 uschar * s = raw_recipients[i];
963 if (LOG_BUFFER_SIZE - g->ptr < Ustrlen(s) + 3) break;
964 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " %s", s);
965 }
966 }
967
968 g = string_catn(g, US"\n", 1);
969 string_from_gstring(g);
970
971 /* Handle loggable errors when running a utility, or when address testing.
972 Write to log_stderr unless debugging (when it will already have been written),
973 or unless there is no log_stderr (expn called from daemon, for example). */
974
975 if (!f.really_exim || f.log_testing_mode)
976 {
977 if ( !debug_selector
978 && log_stderr
979 && (selector == 0 || (selector & log_selector[0]) != 0)
980 )
981 if (host_checking)
982 fprintf(log_stderr, "LOG: %s", CS(log_buffer + 20)); /* no timestamp */
983 else
984 fprintf(log_stderr, "%s", CS log_buffer);
985
986 if ((flags & LOG_PANIC_DIE) == LOG_PANIC_DIE) exim_exit(EXIT_FAILURE, US"");
987 return;
988 }
989
990 /* Handle the main log. We know that either syslog or file logging (or both) is
991 set up. A real file gets left open during reception or delivery once it has
992 been opened, but we don't want to keep on writing to it for too long after it
993 has been renamed. Therefore, do a stat() and see if the inode has changed, and
994 if so, re-open. */
995
996 if ( flags & LOG_MAIN
997 && (!selector || selector & log_selector[0]))
998 {
999 if ( logging_mode & LOG_MODE_SYSLOG
1000 && (syslog_duplication || !(flags & (LOG_REJECT|LOG_PANIC))))
1001 write_syslog(LOG_INFO, log_buffer);
1002
1003 if (logging_mode & LOG_MODE_FILE)
1004 {
1005 struct stat statbuf;
1006
1007 /* Check for a change to the mainlog file name when datestamping is in
1008 operation. This happens at midnight, at which point we want to roll over
1009 the file. Closing it has the desired effect. */
1010
1011 if (mainlog_datestamp)
1012 {
1013 uschar *nowstamp = tod_stamp(string_datestamp_type);
1014 if (Ustrncmp (mainlog_datestamp, nowstamp, Ustrlen(nowstamp)) != 0)
1015 {
1016 (void)close(mainlogfd); /* Close the file */
1017 mainlogfd = -1; /* Clear the file descriptor */
1018 mainlog_inode = 0; /* Unset the inode */
1019 mainlog_datestamp = NULL; /* Clear the datestamp */
1020 }
1021 }
1022
1023 /* Otherwise, we want to check whether the file has been renamed by a
1024 cycling script. This could be "if else", but for safety's sake, leave it as
1025 "if" so that renaming the log starts a new file even when datestamping is
1026 happening. */
1027
1028 if (mainlogfd >= 0)
1029 if (Ustat(mainlog_name, &statbuf) < 0 || statbuf.st_ino != mainlog_inode)
1030 mainlog_close();
1031
1032 /* If the log is closed, open it. Then write the line. */
1033
1034 if (mainlogfd < 0)
1035 {
1036 open_log(&mainlogfd, lt_main, NULL); /* No return on error */
1037 if (fstat(mainlogfd, &statbuf) >= 0) mainlog_inode = statbuf.st_ino;
1038 }
1039
1040 /* Failing to write to the log is disastrous */
1041
1042 written_len = write_to_fd_buf(mainlogfd, g->s, g->ptr);
1043 if (written_len != g->ptr)
1044 {
1045 log_write_failed(US"main log", g->ptr, written_len);
1046 /* That function does not return */
1047 }
1048 }
1049 }
1050
1051 /* Handle the log for rejected messages. This can be globally disabled, in
1052 which case the flags are altered above. If there are any header lines (i.e. if
1053 the rejection is happening after the DATA phase), log the recipients and the
1054 headers. */
1055
1056 if (flags & LOG_REJECT)
1057 {
1058 if (header_list && LOGGING(rejected_header))
1059 {
1060 gstring * g2;
1061 int i;
1062
1063 if (recipients_count > 0)
1064 {
1065 /* List the sender */
1066
1067 g2 = string_fmt_append_f(g, SVFMT_TAINT_NOCHK,
1068 "Envelope-from: <%s>\n", sender_address);
1069 if (g2) g = g2;
1070
1071 /* List up to 5 recipients */
1072
1073 g2 = string_fmt_append_f(g, SVFMT_TAINT_NOCHK,
1074 "Envelope-to: <%s>\n", recipients_list[0].address);
1075 if (g2) g = g2;
1076
1077 for (i = 1; i < recipients_count && i < 5; i++)
1078 {
1079 g2 = string_fmt_append_f(g, SVFMT_TAINT_NOCHK,
1080 " <%s>\n", recipients_list[i].address);
1081 if (g2) g = g2;
1082 }
1083
1084 if (i < recipients_count)
1085 {
1086 g2 = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " ...\n", NULL);
1087 if (g2) g = g2;
1088 }
1089 }
1090
1091 /* A header with a NULL text is an unfilled in Received: header */
1092
1093 for (header_line * h = header_list; h; h = h->next) if (h->text)
1094 {
1095 g2 = string_fmt_append_f(g, SVFMT_TAINT_NOCHK,
1096 "%c %s", h->type, h->text);
1097 if (g2)
1098 g = g2;
1099 else /* Buffer is full; truncate */
1100 {
1101 g->ptr -= 100; /* For message and separator */
1102 if (g->s[g->ptr-1] == '\n') g->ptr--;
1103 g = string_cat(g, US"\n*** truncated ***\n");
1104 break;
1105 }
1106 }
1107 }
1108
1109 /* Write to syslog or to a log file */
1110
1111 if ( logging_mode & LOG_MODE_SYSLOG
1112 && (syslog_duplication || !(flags & LOG_PANIC)))
1113 write_syslog(LOG_NOTICE, string_from_gstring(g));
1114
1115 /* Check for a change to the rejectlog file name when datestamping is in
1116 operation. This happens at midnight, at which point we want to roll over
1117 the file. Closing it has the desired effect. */
1118
1119 if (logging_mode & LOG_MODE_FILE)
1120 {
1121 struct stat statbuf;
1122
1123 if (rejectlog_datestamp)
1124 {
1125 uschar *nowstamp = tod_stamp(string_datestamp_type);
1126 if (Ustrncmp (rejectlog_datestamp, nowstamp, Ustrlen(nowstamp)) != 0)
1127 {
1128 (void)close(rejectlogfd); /* Close the file */
1129 rejectlogfd = -1; /* Clear the file descriptor */
1130 rejectlog_inode = 0; /* Unset the inode */
1131 rejectlog_datestamp = NULL; /* Clear the datestamp */
1132 }
1133 }
1134
1135 /* Otherwise, we want to check whether the file has been renamed by a
1136 cycling script. This could be "if else", but for safety's sake, leave it as
1137 "if" so that renaming the log starts a new file even when datestamping is
1138 happening. */
1139
1140 if (rejectlogfd >= 0)
1141 if (Ustat(rejectlog_name, &statbuf) < 0 ||
1142 statbuf.st_ino != rejectlog_inode)
1143 {
1144 (void)close(rejectlogfd);
1145 rejectlogfd = -1;
1146 rejectlog_inode = 0;
1147 }
1148
1149 /* Open the file if necessary, and write the data */
1150
1151 if (rejectlogfd < 0)
1152 {
1153 open_log(&rejectlogfd, lt_reject, NULL); /* No return on error */
1154 if (fstat(rejectlogfd, &statbuf) >= 0) rejectlog_inode = statbuf.st_ino;
1155 }
1156
1157 written_len = write_to_fd_buf(rejectlogfd, g->s, g->ptr);
1158 if (written_len != g->ptr)
1159 {
1160 log_write_failed(US"reject log", g->ptr, written_len);
1161 /* That function does not return */
1162 }
1163 }
1164 }
1165
1166
1167 /* Handle the panic log, which is not kept open like the others. If it fails to
1168 open, there will be a recursive call to log_write(). We detect this above and
1169 attempt to write to the system log as a last-ditch try at telling somebody. In
1170 all cases except mua_wrapper, try to write to log_stderr. */
1171
1172 if (flags & LOG_PANIC)
1173 {
1174 if (log_stderr && log_stderr != debug_file && !mua_wrapper)
1175 fprintf(log_stderr, "%s", CS string_from_gstring(g));
1176
1177 if (logging_mode & LOG_MODE_SYSLOG)
1178 write_syslog(LOG_ALERT, log_buffer);
1179
1180 /* If this panic logging was caused by a failure to open the main log,
1181 the original log line is in panic_save_buffer. Make an attempt to write it. */
1182
1183 if (logging_mode & LOG_MODE_FILE)
1184 {
1185 panic_recurseflag = TRUE;
1186 open_log(&paniclogfd, lt_panic, NULL); /* Won't return on failure */
1187 panic_recurseflag = FALSE;
1188
1189 if (panic_save_buffer)
1190 {
1191 int i = write(paniclogfd, panic_save_buffer, Ustrlen(panic_save_buffer));
1192 i = i; /* compiler quietening */
1193 }
1194
1195 written_len = write_to_fd_buf(paniclogfd, g->s, g->ptr);
1196 if (written_len != g->ptr)
1197 {
1198 int save_errno = errno;
1199 write_syslog(LOG_CRIT, log_buffer);
1200 sprintf(CS log_buffer, "write failed on panic log: length=%d result=%d "
1201 "errno=%d (%s)", g->ptr, (int)written_len, save_errno, strerror(save_errno));
1202 write_syslog(LOG_CRIT, string_from_gstring(g));
1203 flags |= LOG_PANIC_DIE;
1204 }
1205
1206 (void)close(paniclogfd);
1207 }
1208
1209 /* Give up if the DIE flag is set */
1210
1211 if ((flags & LOG_PANIC_DIE) != LOG_PANIC)
1212 die(NULL, US"Unexpected failure, please try later");
1213 }
1214 }
1215
1216
1217
1218 /*************************************************
1219 * Close any open log files *
1220 *************************************************/
1221
1222 void
1223 log_close_all(void)
1224 {
1225 if (mainlogfd >= 0)
1226 { (void)close(mainlogfd); mainlogfd = -1; }
1227 if (rejectlogfd >= 0)
1228 { (void)close(rejectlogfd); rejectlogfd = -1; }
1229 closelog();
1230 syslog_open = FALSE;
1231 }
1232
1233
1234
1235 /*************************************************
1236 * Multi-bit set or clear *
1237 *************************************************/
1238
1239 /* These functions take a list of bit indexes (terminated by -1) and
1240 clear or set the corresponding bits in the selector.
1241
1242 Arguments:
1243 selector address of the bit string
1244 selsize number of words in the bit string
1245 bits list of bits to set
1246 */
1247
1248 void
1249 bits_clear(unsigned int *selector, size_t selsize, int *bits)
1250 {
1251 for(; *bits != -1; ++bits)
1252 BIT_CLEAR(selector, selsize, *bits);
1253 }
1254
1255 void
1256 bits_set(unsigned int *selector, size_t selsize, int *bits)
1257 {
1258 for(; *bits != -1; ++bits)
1259 BIT_SET(selector, selsize, *bits);
1260 }
1261
1262
1263
1264 /*************************************************
1265 * Decode bit settings for log/debug *
1266 *************************************************/
1267
1268 /* This function decodes a string containing bit settings in the form of +name
1269 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
1270 also recognizes a numeric setting of the form =<number>, but this is not
1271 intended for user use. It's an easy way for Exim to pass the debug settings
1272 when it is re-exec'ed.
1273
1274 The option table is a list of names and bit indexes. The index -1
1275 means "set all bits, except for those listed in notall". The notall
1276 list is terminated by -1.
1277
1278 The action taken for bad values varies depending upon why we're here.
1279 For log messages, or if the debugging is triggered from config, then we write
1280 to the log on the way out. For debug setting triggered from the command-line,
1281 we treat it as an unknown option: error message to stderr and die.
1282
1283 Arguments:
1284 selector address of the bit string
1285 selsize number of words in the bit string
1286 notall list of bits to exclude from "all"
1287 string the configured string
1288 options the table of option names
1289 count size of table
1290 which "log" or "debug"
1291 flags DEBUG_FROM_CONFIG
1292
1293 Returns: nothing on success - bomb out on failure
1294 */
1295
1296 void
1297 decode_bits(unsigned int *selector, size_t selsize, int *notall,
1298 uschar *string, bit_table *options, int count, uschar *which, int flags)
1299 {
1300 uschar *errmsg;
1301 if (string == NULL) return;
1302
1303 if (*string == '=')
1304 {
1305 char *end; /* Not uschar */
1306 memset(selector, 0, sizeof(*selector)*selsize);
1307 *selector = strtoul(CS string+1, &end, 0);
1308 if (*end == 0) return;
1309 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
1310 string);
1311 goto ERROR_RETURN;
1312 }
1313
1314 /* Handle symbolic setting */
1315
1316 else for(;;)
1317 {
1318 BOOL adding;
1319 uschar *s;
1320 int len;
1321 bit_table *start, *end;
1322
1323 while (isspace(*string)) string++;
1324 if (*string == 0) return;
1325
1326 if (*string != '+' && *string != '-')
1327 {
1328 errmsg = string_sprintf("malformed %s_selector setting: "
1329 "+ or - expected but found \"%s\"", which, string);
1330 goto ERROR_RETURN;
1331 }
1332
1333 adding = *string++ == '+';
1334 s = string;
1335 while (isalnum(*string) || *string == '_') string++;
1336 len = string - s;
1337
1338 start = options;
1339 end = options + count;
1340
1341 while (start < end)
1342 {
1343 bit_table *middle = start + (end - start)/2;
1344 int c = Ustrncmp(s, middle->name, len);
1345 if (c == 0)
1346 {
1347 if (middle->name[len] != 0) c = -1; else
1348 {
1349 unsigned int bit = middle->bit;
1350
1351 if (bit == -1)
1352 {
1353 if (adding)
1354 {
1355 memset(selector, -1, sizeof(*selector)*selsize);
1356 bits_clear(selector, selsize, notall);
1357 }
1358 else
1359 memset(selector, 0, sizeof(*selector)*selsize);
1360 }
1361 else if (adding)
1362 BIT_SET(selector, selsize, bit);
1363 else
1364 BIT_CLEAR(selector, selsize, bit);
1365
1366 break; /* Out of loop to match selector name */
1367 }
1368 }
1369 if (c < 0) end = middle; else start = middle + 1;
1370 } /* Loop to match selector name */
1371
1372 if (start >= end)
1373 {
1374 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
1375 adding? '+' : '-', len, s);
1376 goto ERROR_RETURN;
1377 }
1378 } /* Loop for selector names */
1379
1380 /* Handle disasters */
1381
1382 ERROR_RETURN:
1383 if (Ustrcmp(which, "debug") == 0)
1384 {
1385 if (flags & DEBUG_FROM_CONFIG)
1386 {
1387 log_write(0, LOG_CONFIG|LOG_PANIC, "%s", errmsg);
1388 return;
1389 }
1390 fprintf(stderr, "exim: %s\n", errmsg);
1391 exit(EXIT_FAILURE);
1392 }
1393 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
1394 }
1395
1396
1397
1398 /*************************************************
1399 * Activate a debug logfile (late) *
1400 *************************************************/
1401
1402 /* Normally, debugging is activated from the command-line; it may be useful
1403 within the configuration to activate debugging later, based on certain
1404 conditions. If debugging is already in progress, we return early, no action
1405 taken (besides debug-logging that we wanted debug-logging).
1406
1407 Failures in options are not fatal but will result in paniclog entries for the
1408 misconfiguration.
1409
1410 The first use of this is in ACL logic, "control = debug/tag=foo/opts=+expand"
1411 which can be combined with conditions, etc, to activate extra logging only
1412 for certain sources. The second use is inetd wait mode debug preservation. */
1413
1414 void
1415 debug_logging_activate(uschar *tag_name, uschar *opts)
1416 {
1417 int fd = -1;
1418
1419 if (debug_file)
1420 {
1421 debug_printf("DEBUGGING ACTIVATED FROM WITHIN CONFIG.\n"
1422 "DEBUG: Tag=\"%s\" opts=\"%s\"\n", tag_name, opts ? opts : US"");
1423 return;
1424 }
1425
1426 if (tag_name != NULL && (Ustrchr(tag_name, '/') != NULL))
1427 {
1428 log_write(0, LOG_MAIN|LOG_PANIC, "debug tag may not contain a '/' in: %s",
1429 tag_name);
1430 return;
1431 }
1432
1433 debug_selector = D_default;
1434 if (opts)
1435 decode_bits(&debug_selector, 1, debug_notall, opts,
1436 debug_options, debug_options_count, US"debug", DEBUG_FROM_CONFIG);
1437
1438 /* When activating from a transport process we may never have logged at all
1439 resulting in certain setup not having been done. Hack this for now so we
1440 do not segfault; note that nondefault log locations will not work */
1441
1442 if (!*file_path) set_file_path();
1443
1444 open_log(&fd, lt_debug, tag_name);
1445
1446 if (fd != -1)
1447 debug_file = fdopen(fd, "w");
1448 else
1449 log_write(0, LOG_MAIN|LOG_PANIC, "unable to open debug log");
1450 }
1451
1452
1453 void
1454 debug_logging_stop(void)
1455 {
1456 if (!debug_file || !debuglog_name[0]) return;
1457
1458 debug_selector = 0;
1459 fclose(debug_file);
1460 debug_file = NULL;
1461 unlink_log(lt_debug);
1462 }
1463
1464
1465 /* End of log.c */