Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /* $Cambridge: exim/src/src/log.c,v 1.1 2004/10/07 10:39:01 ph10 Exp $ */ |
2 | ||
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
7 | /* Copyright (c) University of Cambridge 1995 - 2004 */ | |
8 | /* See the file NOTICE for conditions of use and distribution. */ | |
9 | ||
10 | /* Functions for writing log files. The code for maintaining datestamped | |
11 | log files was originally contributed by Tony Sheen. */ | |
12 | ||
13 | ||
14 | #include "exim.h" | |
15 | ||
16 | #define LOG_NAME_SIZE 256 | |
17 | #define MAX_SYSLOG_LEN 870 | |
18 | ||
19 | #define LOG_MODE_FILE 1 | |
20 | #define LOG_MODE_SYSLOG 2 | |
21 | ||
22 | enum { lt_main, lt_reject, lt_panic, lt_process }; | |
23 | ||
24 | static uschar *log_names[] = { US"main", US"reject", US"panic", US"process" }; | |
25 | ||
26 | ||
27 | ||
28 | /************************************************* | |
29 | * Local static variables * | |
30 | *************************************************/ | |
31 | ||
32 | static uschar mainlog_name[LOG_NAME_SIZE]; | |
33 | static uschar rejectlog_name[LOG_NAME_SIZE]; | |
34 | ||
35 | static uschar *mainlog_datestamp = NULL; | |
36 | static uschar *rejectlog_datestamp = NULL; | |
37 | ||
38 | static int mainlogfd = -1; | |
39 | static int rejectlogfd = -1; | |
40 | static ino_t mainlog_inode = 0; | |
41 | static ino_t rejectlog_inode = 0; | |
42 | ||
43 | static uschar *panic_save_buffer = NULL; | |
44 | static BOOL panic_recurseflag = FALSE; | |
45 | ||
46 | static BOOL syslog_open = FALSE; | |
47 | static BOOL path_inspected = FALSE; | |
48 | static int logging_mode = LOG_MODE_FILE; | |
49 | static uschar *file_path = US""; | |
50 | ||
51 | ||
52 | ||
53 | ||
54 | /************************************************* | |
55 | * Write to syslog * | |
56 | *************************************************/ | |
57 | ||
58 | /* The given string is split into sections according to length, or at embedded | |
59 | newlines, and syslogged as a numbered sequence if it is overlong or if there is | |
60 | more than one line. | |
61 | ||
62 | Arguments: | |
63 | priority syslog priority | |
64 | s the string to be written | |
65 | ||
66 | Returns: nothing | |
67 | */ | |
68 | ||
69 | static void | |
70 | write_syslog(int priority, uschar *s) | |
71 | { | |
72 | int len, pass; | |
73 | int linecount = 0; | |
74 | ||
75 | if (!syslog_timestamp) s += log_timezone? 26 : 20; | |
76 | ||
77 | len = Ustrlen(s); | |
78 | ||
79 | #ifndef NO_OPENLOG | |
80 | if (!syslog_open) | |
81 | { | |
82 | #ifdef SYSLOG_LOG_PID | |
83 | openlog(CS syslog_processname, LOG_PID|LOG_CONS, syslog_facility); | |
84 | #else | |
85 | openlog(CS syslog_processname, LOG_CONS, syslog_facility); | |
86 | #endif | |
87 | syslog_open = TRUE; | |
88 | } | |
89 | #endif | |
90 | ||
91 | /* First do a scan through the message in order to determine how many lines | |
92 | it is going to end up as. Then rescan to output it. */ | |
93 | ||
94 | for (pass = 0; pass < 2; pass++) | |
95 | { | |
96 | int i; | |
97 | int tlen; | |
98 | uschar *ss = s; | |
99 | for (i = 1, tlen = len; tlen > 0; i++) | |
100 | { | |
101 | int plen = tlen; | |
102 | uschar *nlptr = Ustrchr(ss, '\n'); | |
103 | if (nlptr != NULL) plen = nlptr - ss; | |
104 | #ifndef SYSLOG_LONG_LINES | |
105 | if (plen > MAX_SYSLOG_LEN) plen = MAX_SYSLOG_LEN; | |
106 | #endif | |
107 | tlen -= plen; | |
108 | if (ss[plen] == '\n') tlen--; /* chars left */ | |
109 | ||
110 | if (pass == 0) linecount++; else | |
111 | { | |
112 | if (linecount == 1) | |
113 | syslog(priority, "%.*s", plen, ss); | |
114 | else | |
115 | syslog(priority, "[%d%c%d] %.*s", i, | |
116 | (ss[plen] == '\n' && tlen != 0)? '\\' : '/', | |
117 | linecount, plen, ss); | |
118 | } | |
119 | ss += plen; | |
120 | if (*ss == '\n') ss++; | |
121 | } | |
122 | } | |
123 | } | |
124 | ||
125 | ||
126 | ||
127 | /************************************************* | |
128 | * Die tidily * | |
129 | *************************************************/ | |
130 | ||
131 | /* This is called when Exim is dying as a result of something going wrong in | |
132 | the logging, or after a log call with LOG_PANIC_DIE set. Optionally write a | |
133 | message to debug_file or a stderr file, if they exist. Then, if in the middle | |
134 | of accepting a message, throw it away tidily; this will attempt to send an SMTP | |
135 | response if appropriate. Otherwise, try to close down an outstanding SMTP call | |
136 | tidily. | |
137 | ||
138 | Arguments: | |
139 | s1 Error message to write to debug_file and/or stderr and syslog | |
140 | s2 Error message for any SMTP call that is in progress | |
141 | Returns: The function does not return | |
142 | */ | |
143 | ||
144 | static void | |
145 | die(uschar *s1, uschar *s2) | |
146 | { | |
147 | if (s1 != NULL) | |
148 | { | |
149 | write_syslog(LOG_CRIT, s1); | |
150 | if (debug_file != NULL) debug_printf("%s\n", s1); | |
151 | if (log_stderr != NULL && log_stderr != debug_file) | |
152 | fprintf(log_stderr, "%s\n", s1); | |
153 | } | |
154 | if (receive_call_bombout) receive_bomb_out(s2); /* does not return */ | |
155 | if (smtp_input) smtp_closedown(s2); | |
156 | exim_exit(EXIT_FAILURE); | |
157 | } | |
158 | ||
159 | ||
160 | ||
161 | /************************************************* | |
162 | * Create a log file * | |
163 | *************************************************/ | |
164 | ||
165 | /* This function is called to create and open a log file. It may be called in a | |
166 | subprocess when the original process is root. | |
167 | ||
168 | Arguments: | |
169 | name the file name | |
170 | ||
171 | The file name has been build in a working buffer, so it is permissible to | |
172 | overwrite it temporarily if it is necessary to create the directory. | |
173 | ||
174 | Returns: a file descriptor, or < 0 on failure (errno set) | |
175 | */ | |
176 | ||
177 | static int | |
178 | create_log(uschar *name) | |
179 | { | |
180 | int fd = Uopen(name, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE); | |
181 | ||
182 | /* If creation failed, attempt to build a log directory in case that is the | |
183 | problem. */ | |
184 | ||
185 | if (fd < 0 && errno == ENOENT) | |
186 | { | |
187 | BOOL created; | |
188 | uschar *lastslash = Ustrrchr(name, '/'); | |
189 | *lastslash = 0; | |
190 | created = directory_make(NULL, name, LOG_DIRECTORY_MODE, FALSE); | |
191 | DEBUG(D_any) debug_printf("%s log directory %s\n", | |
192 | created? "created" : "failed to create", name); | |
193 | *lastslash = '/'; | |
194 | if (created) fd = Uopen(name, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE); | |
195 | } | |
196 | ||
197 | return fd; | |
198 | } | |
199 | ||
200 | ||
201 | ||
202 | ||
203 | /************************************************* | |
204 | * Open a log file * | |
205 | *************************************************/ | |
206 | ||
207 | /* This function opens one of a number of logs, which all (except for the | |
208 | "process log") reside in the same directory, creating the directory if it does | |
209 | not exist. This may be called recursively on failure, in order to open the | |
210 | panic log. | |
211 | ||
212 | The directory is in the static variable file_path. This is static so that it | |
213 | the work of sorting out the path is done just once per Exim process. | |
214 | ||
215 | Exim is normally configured to avoid running as root wherever possible, the log | |
216 | files must be owned by the non-privileged exim user. To ensure this, first try | |
217 | an open without O_CREAT - most of the time this will succeed. If it fails, try | |
218 | to create the file; if running as root, this must be done in a subprocess to | |
219 | avoid races. | |
220 | ||
221 | Arguments: | |
222 | fd where to return the resulting file descriptor | |
223 | type lt_main, lt_reject, lt_panic, or lt_process | |
224 | ||
225 | Returns: nothing | |
226 | */ | |
227 | ||
228 | static void | |
229 | open_log(int *fd, int type) | |
230 | { | |
231 | uid_t euid; | |
232 | BOOL ok; | |
233 | uschar buffer[LOG_NAME_SIZE]; | |
234 | ||
235 | /* Sort out the file name. This depends on the type of log we are opening. The | |
236 | process "log" is written in the spool directory by default, but a path name can | |
237 | be specified in the configuration. */ | |
238 | ||
239 | if (type == lt_process) | |
240 | { | |
241 | if (process_log_path == NULL) | |
242 | ok = string_format(buffer, sizeof(buffer), "%s/exim-process.info", | |
243 | spool_directory); | |
244 | else | |
245 | ok = string_format(buffer, sizeof(buffer), "%s", process_log_path); | |
246 | } | |
247 | ||
248 | /* The names of the other three logs are controlled by file_path. The panic log | |
249 | is written to the same directory as the main and reject logs, but its name does | |
250 | not have a datestamp. The use of datestamps is indicated by %D in file_path. | |
251 | When opening the panic log, if %D is present, we remove the datestamp from the | |
252 | generated name; if it is at the start, remove a following non-alphameric | |
253 | character as well; otherwise, remove a preceding non-alphameric character. This | |
254 | is definitely kludgy, but it sort of does what people want, I hope. */ | |
255 | ||
256 | else | |
257 | { | |
258 | ok = string_format(buffer, sizeof(buffer), CS file_path, log_names[type]); | |
259 | ||
260 | /* Save the name of the mainlog for rollover processing. Without a datestamp, | |
261 | it gets statted to see if it has been cycled. With a datestamp, the datestamp | |
262 | will be compared. The static slot for saving it is the same size as buffer, | |
263 | and the text has been checked above to fit, so this use of strcpy() is OK. */ | |
264 | ||
265 | if (type == lt_main) | |
266 | { | |
267 | Ustrcpy(mainlog_name, buffer); | |
268 | mainlog_datestamp = mainlog_name + string_datestamp_offset; | |
269 | } | |
270 | ||
271 | /* Ditto for the reject log */ | |
272 | ||
273 | else if (type == lt_reject) | |
274 | { | |
275 | Ustrcpy(rejectlog_name, buffer); | |
276 | rejectlog_datestamp = rejectlog_name + string_datestamp_offset; | |
277 | } | |
278 | ||
279 | /* Remove any datestamp if this is the panic log. This is rare, so there's no | |
280 | need to optimize getting the datestamp length. We remove one non-alphanumeric | |
281 | char afterwards if at the start, otherwise one before. */ | |
282 | ||
283 | else if (string_datestamp_offset >= 0) | |
284 | { | |
285 | uschar *from = buffer + string_datestamp_offset; | |
286 | uschar *to = from + Ustrlen(tod_stamp(tod_log_datestamp)); | |
287 | if (from == buffer || from[-1] == '/') | |
288 | { | |
289 | if (!isalnum(*to)) to++; | |
290 | } | |
291 | else | |
292 | { | |
293 | if (!isalnum(from[-1])) from--; | |
294 | } | |
295 | ||
296 | /* This strcpy is ok, because we know that to is a substring of from. */ | |
297 | ||
298 | Ustrcpy(from, to); | |
299 | } | |
300 | } | |
301 | ||
302 | /* If the file name is too long, it is an unrecoverable disaster */ | |
303 | ||
304 | if (!ok) | |
305 | { | |
306 | die(US"exim: log file path too long: aborting", | |
307 | US"Logging failure; please try later"); | |
308 | } | |
309 | ||
310 | /* We now have the file name. Try to open an existing file. After a successful | |
311 | open, arrange for automatic closure on exec(), and then return. */ | |
312 | ||
313 | *fd = Uopen(buffer, O_APPEND|O_WRONLY, LOG_MODE); | |
314 | ||
315 | if (*fd >= 0) | |
316 | { | |
317 | fcntl(*fd, F_SETFD, fcntl(*fd, F_GETFD) | FD_CLOEXEC); | |
318 | return; | |
319 | } | |
320 | ||
321 | /* Open was not successful: try creating the file. If this is a root process, | |
322 | we must do the creating in a subprocess set to exim:exim in order to ensure | |
323 | that the file is created with the right ownership. Otherwise, there can be a | |
324 | race if an exim process is trying to write to the log at the same time. The use | |
325 | of SIGUSR1 by the exiwhat utility can provoke a lot of simultaneous writing. */ | |
326 | ||
327 | euid = geteuid(); | |
328 | ||
329 | /* If we are already running as the Exim user (even if that user is root), | |
330 | we can go ahead and create in the current process. */ | |
331 | ||
332 | if (euid == exim_uid) *fd = create_log(buffer); | |
333 | ||
334 | /* Otherwise, if we are root, do the creation in an exim:exim subprocess. If we | |
335 | are neither exim nor root, creation is not attempted. */ | |
336 | ||
337 | else if (euid == root_uid) | |
338 | { | |
339 | int status; | |
340 | pid_t pid = fork(); | |
341 | ||
342 | /* In the subprocess, change uid/gid and do the creation. Return 0 from the | |
343 | subprocess on success. There doesn't seem much point in testing for setgid | |
344 | and setuid errors. */ | |
345 | ||
346 | if (pid == 0) | |
347 | { | |
348 | (void)setgid(exim_gid); | |
349 | (void)setuid(exim_uid); | |
350 | _exit((create_log(buffer) < 0)? 1 : 0); | |
351 | } | |
352 | ||
353 | /* Wait for the subprocess. If it succeeded retry the open. */ | |
354 | ||
355 | while (waitpid(pid, &status, 0) != pid); | |
356 | if (status == 0) *fd = Uopen(buffer, O_APPEND|O_WRONLY, LOG_MODE); | |
357 | } | |
358 | ||
359 | /* If we now have an open file, set the close-on-exec flag and return. */ | |
360 | ||
361 | if (*fd >= 0) | |
362 | { | |
363 | fcntl(*fd, F_SETFD, fcntl(*fd, F_GETFD) | FD_CLOEXEC); | |
364 | return; | |
365 | } | |
366 | ||
367 | /* Creation failed. There are some circumstances in which we get here when | |
368 | the effective uid is not root or exim, which is the problem. (For example, a | |
369 | non-setuid binary with log_arguments set, called in certain ways.) Rather than | |
370 | just bombing out, force the log to stderr and carry on if stderr is available. | |
371 | */ | |
372 | ||
373 | if (euid != root_uid && euid != exim_uid && log_stderr != NULL) | |
374 | { | |
375 | *fd = fileno(log_stderr); | |
376 | return; | |
377 | } | |
378 | ||
379 | /* Otherwise this is a disaster. This call is deliberately ONLY to the panic | |
380 | log. If possible, save a copy of the original line that was being logged. If we | |
381 | are recursing (can't open the panic log either), the pointer will already be | |
382 | set. */ | |
383 | ||
384 | if (panic_save_buffer == NULL) | |
385 | { | |
386 | panic_save_buffer = (uschar *)malloc(LOG_BUFFER_SIZE); | |
387 | if (panic_save_buffer != NULL) | |
388 | memcpy(panic_save_buffer, log_buffer, LOG_BUFFER_SIZE); | |
389 | } | |
390 | ||
391 | log_write(0, LOG_PANIC_DIE, "Cannot open %s log file \"%s\": %s: " | |
392 | "euid=%d egid=%d", log_names[type], buffer, strerror(errno), euid, getegid()); | |
393 | /* Never returns */ | |
394 | } | |
395 | ||
396 | ||
397 | ||
398 | /************************************************* | |
399 | * Add configuration file info to log line * | |
400 | *************************************************/ | |
401 | ||
402 | /* This is put in a function because it's needed twice (once for debugging, | |
403 | once for real). | |
404 | ||
405 | Arguments: | |
406 | ptr pointer to the end of the line we are building | |
407 | flags log flags | |
408 | ||
409 | Returns: updated pointer | |
410 | */ | |
411 | ||
412 | static uschar * | |
413 | log_config_info(uschar *ptr, int flags) | |
414 | { | |
415 | Ustrcpy(ptr, "Exim configuration error"); | |
416 | ptr += 24; | |
417 | ||
418 | if ((flags & (LOG_CONFIG_FOR & ~LOG_CONFIG)) != 0) | |
419 | { | |
420 | Ustrcpy(ptr, " for "); | |
421 | return ptr + 5; | |
422 | } | |
423 | ||
424 | if ((flags & (LOG_CONFIG_IN & ~LOG_CONFIG)) != 0) | |
425 | { | |
426 | sprintf(CS ptr, " in line %d of %s", config_lineno, config_filename); | |
427 | while (*ptr) ptr++; | |
428 | } | |
429 | ||
430 | Ustrcpy(ptr, ":\n "); | |
431 | return ptr + 4; | |
432 | } | |
433 | ||
434 | ||
435 | /************************************************* | |
436 | * A write() operation failed * | |
437 | *************************************************/ | |
438 | ||
439 | /* This function is called when write() fails on anything other than the panic | |
440 | log, which can happen if a disk gets full or a file gets too large or whatever. | |
441 | We try to save the relevant message in the panic_save buffer before crashing | |
442 | out. | |
443 | ||
444 | Arguments: | |
445 | name the name of the log being written | |
446 | length the string length being written | |
447 | rc the return value from write() | |
448 | ||
449 | Returns: does not return | |
450 | */ | |
451 | ||
452 | static void | |
453 | log_write_failed(uschar *name, int length, int rc) | |
454 | { | |
455 | int save_errno = errno; | |
456 | ||
457 | if (panic_save_buffer == NULL) | |
458 | { | |
459 | panic_save_buffer = (uschar *)malloc(LOG_BUFFER_SIZE); | |
460 | if (panic_save_buffer != NULL) | |
461 | memcpy(panic_save_buffer, log_buffer, LOG_BUFFER_SIZE); | |
462 | } | |
463 | ||
464 | log_write(0, LOG_PANIC_DIE, "failed to write to %s: length=%d result=%d " | |
465 | "errno=%d (%s)", name, length, rc, save_errno, | |
466 | (save_errno == 0)? "write incomplete" : strerror(save_errno)); | |
467 | /* Never returns */ | |
468 | } | |
469 | ||
470 | ||
471 | ||
472 | /************************************************* | |
473 | * Write message to log file * | |
474 | *************************************************/ | |
475 | ||
476 | /* Exim can be configured to log to local files, or use syslog, or both. This | |
477 | is controlled by the setting of log_file_path. The following cases are | |
478 | recognized: | |
479 | ||
480 | log_file_path = "" write files in the spool/log directory | |
481 | log_file_path = "xxx" write files in the xxx directory | |
482 | log_file_path = "syslog" write to syslog | |
483 | log_file_path = "syslog : xxx" write to syslog and to files (any order) | |
484 | ||
485 | The one exception to this is messages containing LOG_PROCESS. These are always | |
486 | written to exim-process.info in the spool directory. They aren't really log | |
487 | messages in the same sense as the others. | |
488 | ||
489 | The message always gets '\n' added on the end of it, since more than one | |
490 | process may be writing to the log at once and we don't want intermingling to | |
491 | happen in the middle of lines. To be absolutely sure of this we write the data | |
492 | into a private buffer and then put it out in a single write() call. | |
493 | ||
494 | The flags determine which log(s) the message is written to, or for syslogging, | |
495 | which priority to use, and in the case of the panic log, whether the process | |
496 | should die afterwards. | |
497 | ||
498 | The variable really_exim is TRUE only when exim is running in privileged state | |
499 | (i.e. not with a changed configuration or with testing options such as -brw). | |
500 | If it is not, don't try to write to the log because permission will probably be | |
501 | denied. | |
502 | ||
503 | Avoid actually writing to the logs when exim is called with -bv or -bt to | |
504 | test an address, but take other actions, such as panicing. | |
505 | ||
506 | In Exim proper, the buffer for building the message is got at start-up, so that | |
507 | nothing gets done if it can't be got. However, some functions that are also | |
508 | used in utilities occasionally obey log_write calls in error situations, and it | |
509 | is simplest to put a single malloc() here rather than put one in each utility. | |
510 | Malloc is used directly because the store functions may call log_write(). | |
511 | ||
512 | If a message_id exists, we include it after the timestamp. | |
513 | ||
514 | Arguments: | |
515 | selector write to main log or LOG_INFO only if this value is zero, or if | |
516 | its bit is set in log_write_selector | |
517 | flags each bit indicates some independent action: | |
518 | LOG_SENDER add raw sender to the message | |
519 | LOG_RECIPIENTS add raw recipients list to message | |
520 | LOG_CONFIG add "Exim configuration error" | |
521 | LOG_CONFIG_FOR add " for " instead of ":\n " | |
522 | LOG_CONFIG_IN add " in line x[ of file y]" | |
523 | LOG_MAIN write to main log or syslog LOG_INFO | |
524 | LOG_REJECT write to reject log or syslog LOG_NOTICE | |
525 | LOG_PANIC write to panic log or syslog LOG_ALERT | |
526 | LOG_PANIC_DIE write to panic log or LOG_ALERT and then crash | |
527 | LOG_PROCESS write to process log (always a file) | |
528 | format a printf() format | |
529 | ... arguments for format | |
530 | ||
531 | Returns: nothing | |
532 | */ | |
533 | ||
534 | void | |
535 | log_write(unsigned int selector, int flags, char *format, ...) | |
536 | { | |
537 | uschar *ptr; | |
538 | int length, rc; | |
539 | int paniclogfd; | |
540 | va_list ap; | |
541 | ||
542 | /* If panic_recurseflag is set, we have failed to open the panic log. This is | |
543 | the ultimate disaster. First try to write the message to a debug file and/or | |
544 | stderr and also to syslog. If panic_save_buffer is not NULL, it contains the | |
545 | original log line that caused the problem. Afterwards, expire. */ | |
546 | ||
547 | if (panic_recurseflag) | |
548 | { | |
549 | uschar *extra = (panic_save_buffer == NULL)? US"" : panic_save_buffer; | |
550 | if (debug_file != NULL) debug_printf("%s%s", extra, log_buffer); | |
551 | if (log_stderr != NULL && log_stderr != debug_file) | |
552 | fprintf(log_stderr, "%s%s", extra, log_buffer); | |
553 | if (*extra != 0) write_syslog(LOG_CRIT, extra); | |
554 | write_syslog(LOG_CRIT, log_buffer); | |
555 | die(US"exim: could not open panic log - aborting: see message(s) above", | |
556 | US"Unexpected log failure, please try later"); | |
557 | } | |
558 | ||
559 | /* Ensure we have a buffer (see comment above); this should never be obeyed | |
560 | when running Exim proper, only when running utilities. */ | |
561 | ||
562 | if (log_buffer == NULL) | |
563 | { | |
564 | log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE); | |
565 | if (log_buffer == NULL) | |
566 | { | |
567 | fprintf(stderr, "exim: failed to get store for log buffer\n"); | |
568 | exim_exit(EXIT_FAILURE); | |
569 | } | |
570 | } | |
571 | ||
572 | /* If we haven't already done so, inspect the setting of log_file_path to | |
573 | determine whether to log to files and/or to syslog. Bits in logging_mode | |
574 | control this, and for file logging, the path must end up in file_path. This | |
575 | variable must be in permanent store because it may be required again later in | |
576 | the process. */ | |
577 | ||
578 | if (!path_inspected) | |
579 | { | |
580 | BOOL multiple = FALSE; | |
581 | int old_pool = store_pool; | |
582 | ||
583 | store_pool = POOL_PERM; | |
584 | ||
585 | /* If nothing has been set, don't waste effort... the default values for the | |
586 | statics are file_path="" and logging_mode = LOG_MODE_FILE. */ | |
587 | ||
588 | if (log_file_path[0] != 0) | |
589 | { | |
590 | int sep = ':'; /* Fixed separator - outside use */ | |
591 | uschar *s; | |
592 | uschar *ss = log_file_path; | |
593 | logging_mode = 0; | |
594 | while ((s = string_nextinlist(&ss,&sep,log_buffer,LOG_BUFFER_SIZE)) != NULL) | |
595 | { | |
596 | if (Ustrcmp(s, "syslog") == 0) | |
597 | logging_mode |= LOG_MODE_SYSLOG; | |
598 | else if ((logging_mode & LOG_MODE_FILE) != 0) multiple = TRUE; | |
599 | else | |
600 | { | |
601 | logging_mode |= LOG_MODE_FILE; | |
602 | ||
603 | /* If a non-empty path is given, use it */ | |
604 | ||
605 | if (s[0] != 0) | |
606 | { | |
607 | file_path = string_copy(s); | |
608 | } | |
609 | ||
610 | /* If the path is empty, we want to use the first non-empty, non- | |
611 | syslog item in LOG_FILE_PATH, if there is one, since the value of | |
612 | log_file_path may have been set at runtime. If there is no such item, | |
613 | use the ultimate default in the spool directory. */ | |
614 | ||
615 | else | |
616 | { | |
617 | uschar *t; | |
618 | uschar *tt = US LOG_FILE_PATH; | |
619 | while ((t = string_nextinlist(&tt,&sep,log_buffer,LOG_BUFFER_SIZE)) | |
620 | != NULL) | |
621 | { | |
622 | if (Ustrcmp(t, "syslog") == 0 || t[0] == 0) continue; | |
623 | file_path = string_copy(t); | |
624 | break; | |
625 | } | |
626 | } /* Empty item in log_file_path */ | |
627 | } /* First non-syslog item in log_file_path */ | |
628 | } /* Scan of log_file_path */ | |
629 | } | |
630 | ||
631 | /* If no modes have been selected, it is a major disaster */ | |
632 | ||
633 | if (logging_mode == 0) | |
634 | die(US"Neither syslog nor file logging set in log_file_path", | |
635 | US"Unexpected logging failure"); | |
636 | ||
637 | /* Set up the ultimate default if necessary. Then revert to the old store | |
638 | pool, and record that we've sorted out the path. */ | |
639 | ||
640 | if ((logging_mode & LOG_MODE_FILE) != 0 && file_path[0] == 0) | |
641 | file_path = string_sprintf("%s/log/%%slog", spool_directory); | |
642 | store_pool = old_pool; | |
643 | path_inspected = TRUE; | |
644 | ||
645 | /* If more than one file path was given, log a complaint. This recursive call | |
646 | should work since we have now set up the routing. */ | |
647 | ||
648 | if (multiple) | |
649 | { | |
650 | log_write(0, LOG_MAIN|LOG_PANIC, | |
651 | "More than one path given in log_file_path: using %s", file_path); | |
652 | } | |
653 | } | |
654 | ||
655 | /* If debugging, show all log entries, but don't show headers. Do it all | |
656 | in one go so that it doesn't get split when multi-processing. */ | |
657 | ||
658 | DEBUG(D_any|D_v) | |
659 | { | |
660 | int i; | |
661 | ptr = log_buffer; | |
662 | ||
663 | Ustrcpy(ptr, "LOG:"); | |
664 | ptr += 4; | |
665 | ||
666 | /* Show the options that were passed into the call. These are those whose | |
667 | flag values do not have the 0x80000000 bit in them. Note that this | |
668 | automatically exclude the "all" setting. */ | |
669 | ||
670 | for (i = 0; i < log_options_count; i++) | |
671 | { | |
672 | unsigned int bit = log_options[i].bit; | |
673 | if ((bit & 0x80000000) != 0) continue; | |
674 | if ((selector & bit) != 0) | |
675 | { | |
676 | *ptr++ = ' '; | |
677 | Ustrcpy(ptr, log_options[i].name); | |
678 | while (*ptr) ptr++; | |
679 | } | |
680 | } | |
681 | ||
682 | sprintf(CS ptr, "%s%s%s%s%s\n ", | |
683 | ((flags & LOG_MAIN) != 0)? " MAIN" : "", | |
684 | ((flags & LOG_PANIC) != 0)? " PANIC" : "", | |
685 | ((flags & LOG_PANIC_DIE) == LOG_PANIC_DIE)? " DIE" : "", | |
686 | ((flags & LOG_PROCESS) != 0)? " PROCESS": "", | |
687 | ((flags & LOG_REJECT) != 0)? " REJECT" : ""); | |
688 | ||
689 | while(*ptr) ptr++; | |
690 | if ((flags & LOG_CONFIG) != 0) ptr = log_config_info(ptr, flags); | |
691 | ||
692 | va_start(ap, format); | |
693 | if (!string_vformat(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer)-1, format, ap)) | |
694 | Ustrcpy(ptr, "**** log string overflowed log buffer ****"); | |
695 | va_end(ap); | |
696 | ||
697 | while(*ptr) ptr++; | |
698 | Ustrcat(ptr, "\n"); | |
699 | debug_printf("%s", log_buffer); | |
700 | } | |
701 | ||
702 | /* If no log file is specified, we are in a mess. */ | |
703 | ||
704 | if ((flags & (LOG_MAIN|LOG_PANIC|LOG_REJECT|LOG_PROCESS)) == 0) | |
705 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "log_write called with no log " | |
706 | "flags set"); | |
707 | ||
708 | /* There are some weird circumstances in which logging is disabled. */ | |
709 | ||
710 | if (disable_logging) | |
711 | { | |
712 | DEBUG(D_any) debug_printf("log writing disabled\n"); | |
713 | return; | |
714 | } | |
715 | ||
716 | /* Create the main message in the log buffer, including the message | |
717 | id except for the process log and when called by a utility. */ | |
718 | ||
719 | ptr = log_buffer; | |
720 | if (really_exim && (flags & LOG_PROCESS) == 0 && message_id[0] != 0) | |
721 | sprintf(CS ptr, "%s %s ", tod_stamp(tod_log), message_id); | |
722 | else sprintf(CS ptr, "%s ", tod_stamp(tod_log)); | |
723 | ||
724 | while(*ptr) ptr++; | |
725 | if ((flags & LOG_CONFIG) != 0) ptr = log_config_info(ptr, flags); | |
726 | ||
727 | va_start(ap, format); | |
728 | if (!string_vformat(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer)-1, format, ap)) | |
729 | Ustrcpy(ptr, "**** log string overflowed log buffer ****\n"); | |
730 | while(*ptr) ptr++; | |
731 | va_end(ap); | |
732 | ||
733 | /* Add the raw, unrewritten, sender to the message if required. This is done | |
734 | this way because it kind of fits with LOG_RECIPIENTS. */ | |
735 | ||
736 | if ((flags & LOG_SENDER) != 0 && | |
737 | ptr < log_buffer + LOG_BUFFER_SIZE - 8 - Ustrlen(raw_sender)) | |
738 | { | |
739 | sprintf(CS ptr, " from <%s>", raw_sender); | |
740 | while (*ptr) ptr++; | |
741 | } | |
742 | ||
743 | /* Add list of recipients to the message if required; the raw list, | |
744 | before rewriting, was saved in raw_recipients. There may be none, if an ACL | |
745 | discarded them all. */ | |
746 | ||
747 | if ((flags & LOG_RECIPIENTS) != 0 && ptr < log_buffer + LOG_BUFFER_SIZE - 6 && | |
748 | raw_recipients_count > 0) | |
749 | { | |
750 | int i; | |
751 | sprintf(CS ptr, " for"); | |
752 | while (*ptr) ptr++; | |
753 | for (i = 0; i < raw_recipients_count; i++) | |
754 | { | |
755 | uschar *s = raw_recipients[i]; | |
756 | if (log_buffer + LOG_BUFFER_SIZE - ptr < Ustrlen(s) + 3) break; | |
757 | sprintf(CS ptr, " %s", s); | |
758 | while (*ptr) ptr++; | |
759 | } | |
760 | } | |
761 | ||
762 | sprintf(CS ptr, "\n"); | |
763 | while(*ptr) ptr++; | |
764 | length = ptr - log_buffer; | |
765 | ||
766 | /* Handle loggable errors when running a utility, or when address testing. | |
767 | Write to log_stderr unless debugging (when it will already have been written), | |
768 | or unless there is no log_stderr (expn called from daemon, for example). */ | |
769 | ||
770 | if (!really_exim || log_testing_mode) | |
771 | { | |
772 | if (debug_selector == 0 && log_stderr != NULL && | |
773 | (selector == 0 || (selector & log_write_selector) != 0)) | |
774 | { | |
775 | if (host_checking) | |
776 | fprintf(log_stderr, "LOG: %s", CS(log_buffer + 20)); /* no timestamp */ | |
777 | else | |
778 | fprintf(log_stderr, "%s", CS log_buffer); | |
779 | } | |
780 | if ((flags & LOG_PANIC_DIE) == LOG_PANIC_DIE) exim_exit(EXIT_FAILURE); | |
781 | return; | |
782 | } | |
783 | ||
784 | /* Handle the main log. We know that either syslog or file logging (or both) is | |
785 | set up. A real file gets left open during reception or delivery once it has | |
786 | been opened, but we don't want to keep on writing to it for too long after it | |
787 | has been renamed. Therefore, do a stat() and see if the inode has changed, and | |
788 | if so, re-open. */ | |
789 | ||
790 | if ((flags & LOG_MAIN) != 0 && | |
791 | (selector == 0 || (selector & log_write_selector) != 0)) | |
792 | { | |
793 | if ((logging_mode & LOG_MODE_SYSLOG) != 0 && | |
794 | (syslog_duplication || (flags & (LOG_REJECT|LOG_PANIC)) == 0)) | |
795 | write_syslog(LOG_INFO, log_buffer); | |
796 | ||
797 | if ((logging_mode & LOG_MODE_FILE) != 0) | |
798 | { | |
799 | struct stat statbuf; | |
800 | ||
801 | /* Check for a change to the mainlog file name when datestamping is in | |
802 | operation. This happens at midnight, at which point we want to roll over | |
803 | the file. Closing it has the desired effect. */ | |
804 | ||
805 | if (mainlog_datestamp != NULL) | |
806 | { | |
807 | uschar *nowstamp = tod_stamp(tod_log_datestamp); | |
808 | if (Ustrncmp (mainlog_datestamp, nowstamp, Ustrlen(nowstamp)) != 0) | |
809 | { | |
810 | close(mainlogfd); /* Close the file */ | |
811 | mainlogfd = -1; /* Clear the file descriptor */ | |
812 | mainlog_inode = 0; /* Unset the inode */ | |
813 | mainlog_datestamp = NULL; /* Clear the datestamp */ | |
814 | } | |
815 | } | |
816 | ||
817 | /* Otherwise, we want to check whether the file has been renamed by a | |
818 | cycling script. This could be "if else", but for safety's sake, leave it as | |
819 | "if" so that renaming the log starts a new file even when datestamping is | |
820 | happening. */ | |
821 | ||
822 | if (mainlogfd >= 0) | |
823 | { | |
824 | if (Ustat(mainlog_name, &statbuf) < 0 || statbuf.st_ino != mainlog_inode) | |
825 | { | |
826 | close(mainlogfd); | |
827 | mainlogfd = -1; | |
828 | mainlog_inode = 0; | |
829 | } | |
830 | } | |
831 | ||
832 | /* If the log is closed, open it. Then write the line. */ | |
833 | ||
834 | if (mainlogfd < 0) | |
835 | { | |
836 | open_log(&mainlogfd, lt_main); /* No return on error */ | |
837 | if (fstat(mainlogfd, &statbuf) >= 0) mainlog_inode = statbuf.st_ino; | |
838 | } | |
839 | ||
840 | /* Failing to write to the log is disastrous */ | |
841 | ||
842 | if ((rc = write(mainlogfd, log_buffer, length)) != length) | |
843 | { | |
844 | log_write_failed(US"main log", length, rc); | |
845 | /* That function does not return */ | |
846 | } | |
847 | } | |
848 | } | |
849 | ||
850 | /* Handle the log for rejected messages. This can be globally disabled. If | |
851 | there are any header lines (i.e. if the rejection is happening after the DATA | |
852 | phase), log the recipients and the headers. */ | |
853 | ||
854 | if (write_rejectlog && (flags & LOG_REJECT) != 0) | |
855 | { | |
856 | header_line *h; | |
857 | ||
858 | if (header_list != NULL && (log_extra_selector & LX_rejected_header) != 0) | |
859 | { | |
860 | if (recipients_count > 0) | |
861 | { | |
862 | int i; | |
863 | ||
864 | /* List the sender */ | |
865 | ||
866 | string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer), | |
867 | "Envelope-from: <%s>\n", sender_address); | |
868 | while (*ptr) ptr++; | |
869 | ||
870 | /* List up to 5 recipients */ | |
871 | ||
872 | string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer), | |
873 | "Envelope-to: <%s>\n", recipients_list[0].address); | |
874 | while (*ptr) ptr++; | |
875 | ||
876 | for (i = 1; i < recipients_count && i < 5; i++) | |
877 | { | |
878 | string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer), " <%s>\n", | |
879 | recipients_list[i].address); | |
880 | while (*ptr) ptr++; | |
881 | } | |
882 | ||
883 | if (i < recipients_count) | |
884 | { | |
885 | (void)string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer), | |
886 | " ...\n"); | |
887 | while (*ptr) ptr++; | |
888 | } | |
889 | } | |
890 | ||
891 | /* A header with a NULL text is an unfilled in Received: header */ | |
892 | ||
893 | for (h = header_list; h != NULL; h = h->next) | |
894 | { | |
895 | BOOL fitted; | |
896 | if (h->text == NULL) continue; | |
897 | fitted = string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer), | |
898 | "%c %s", h->type, h->text); | |
899 | while(*ptr) ptr++; | |
900 | if (!fitted) /* Buffer is full; truncate */ | |
901 | { | |
902 | ptr -= 100; /* For message and separator */ | |
903 | if (ptr[-1] == '\n') ptr--; | |
904 | Ustrcpy(ptr, "\n*** truncated ***\n"); | |
905 | while (*ptr) ptr++; | |
906 | break; | |
907 | } | |
908 | } | |
909 | ||
910 | length = ptr - log_buffer; | |
911 | } | |
912 | ||
913 | /* Write to syslog or to a log file */ | |
914 | ||
915 | if ((logging_mode & LOG_MODE_SYSLOG) != 0 && | |
916 | (syslog_duplication || (flags & LOG_PANIC) == 0)) | |
917 | write_syslog(LOG_NOTICE, log_buffer); | |
918 | ||
919 | /* Check for a change to the rejectlog file name when datestamping is in | |
920 | operation. This happens at midnight, at which point we want to roll over | |
921 | the file. Closing it has the desired effect. */ | |
922 | ||
923 | if ((logging_mode & LOG_MODE_FILE) != 0) | |
924 | { | |
925 | struct stat statbuf; | |
926 | ||
927 | if (rejectlog_datestamp != NULL) | |
928 | { | |
929 | uschar *nowstamp = tod_stamp(tod_log_datestamp); | |
930 | if (Ustrncmp (rejectlog_datestamp, nowstamp, Ustrlen(nowstamp)) != 0) | |
931 | { | |
932 | close(rejectlogfd); /* Close the file */ | |
933 | rejectlogfd = -1; /* Clear the file descriptor */ | |
934 | rejectlog_inode = 0; /* Unset the inode */ | |
935 | rejectlog_datestamp = NULL; /* Clear the datestamp */ | |
936 | } | |
937 | } | |
938 | ||
939 | /* Otherwise, we want to check whether the file has been renamed by a | |
940 | cycling script. This could be "if else", but for safety's sake, leave it as | |
941 | "if" so that renaming the log starts a new file even when datestamping is | |
942 | happening. */ | |
943 | ||
944 | if (rejectlogfd >= 0) | |
945 | { | |
946 | if (Ustat(rejectlog_name, &statbuf) < 0 || | |
947 | statbuf.st_ino != rejectlog_inode) | |
948 | { | |
949 | close(rejectlogfd); | |
950 | rejectlogfd = -1; | |
951 | rejectlog_inode = 0; | |
952 | } | |
953 | } | |
954 | ||
955 | /* Open the file if necessary, and write the data */ | |
956 | ||
957 | if (rejectlogfd < 0) | |
958 | { | |
959 | open_log(&rejectlogfd, lt_reject); /* No return on error */ | |
960 | if (fstat(rejectlogfd, &statbuf) >= 0) rejectlog_inode = statbuf.st_ino; | |
961 | } | |
962 | ||
963 | if ((rc = write(rejectlogfd, log_buffer, length)) != length) | |
964 | { | |
965 | log_write_failed(US"reject log", length, rc); | |
966 | /* That function does not return */ | |
967 | } | |
968 | } | |
969 | } | |
970 | ||
971 | ||
972 | /* Handle the process log file, where exim processes can be made to dump | |
973 | details of what they are doing by sending them a USR1 signal. Note that | |
974 | a message id is not automatically added above. This information is always | |
975 | written to a file - never to syslog. */ | |
976 | ||
977 | if ((flags & LOG_PROCESS) != 0) | |
978 | { | |
979 | int processlogfd; | |
980 | open_log(&processlogfd, lt_process); /* No return on error */ | |
981 | if ((rc = write(processlogfd, log_buffer, length)) != length) | |
982 | { | |
983 | log_write_failed(US"process log", length, rc); | |
984 | /* That function does not return */ | |
985 | } | |
986 | (void)close(processlogfd); | |
987 | } | |
988 | ||
989 | ||
990 | /* Handle the panic log, which is not kept open like the others. If it fails to | |
991 | open, there will be a recursive call to log_write(). We detect this above and | |
992 | attempt to write to the system log as a last-ditch try at telling somebody. In | |
993 | all cases, try to write to log_stderr. */ | |
994 | ||
995 | if ((flags & LOG_PANIC) != 0) | |
996 | { | |
997 | if (log_stderr != NULL && log_stderr != debug_file) | |
998 | fprintf(log_stderr, "%s", CS log_buffer); | |
999 | ||
1000 | if ((logging_mode & LOG_MODE_SYSLOG) != 0) | |
1001 | { | |
1002 | write_syslog(LOG_ALERT, log_buffer); | |
1003 | } | |
1004 | ||
1005 | /* If this panic logging was caused by a failure to open the main log, | |
1006 | the original log line is in panic_save_buffer. Make an attempt to write it. */ | |
1007 | ||
1008 | if ((logging_mode & LOG_MODE_FILE) != 0) | |
1009 | { | |
1010 | panic_recurseflag = TRUE; | |
1011 | open_log(&paniclogfd, lt_panic); /* Won't return on failure */ | |
1012 | panic_recurseflag = FALSE; | |
1013 | ||
1014 | if (panic_save_buffer != NULL) | |
1015 | (void) write(paniclogfd, panic_save_buffer, Ustrlen(panic_save_buffer)); | |
1016 | ||
1017 | if ((rc = write(paniclogfd, log_buffer, length)) != length) | |
1018 | { | |
1019 | int save_errno = errno; | |
1020 | write_syslog(LOG_CRIT, log_buffer); | |
1021 | sprintf(CS log_buffer, "write failed on panic log: length=%d result=%d " | |
1022 | "errno=%d (%s)", length, rc, save_errno, strerror(save_errno)); | |
1023 | write_syslog(LOG_CRIT, log_buffer); | |
1024 | flags |= LOG_PANIC_DIE; | |
1025 | } | |
1026 | ||
1027 | close(paniclogfd); | |
1028 | } | |
1029 | ||
1030 | /* Give up if the DIE flag is set */ | |
1031 | ||
1032 | if ((flags & LOG_PANIC_DIE) != LOG_PANIC) | |
1033 | die(NULL, US"Unexpected failure, please try later"); | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | ||
1038 | ||
1039 | /************************************************* | |
1040 | * Close any open log files * | |
1041 | *************************************************/ | |
1042 | ||
1043 | void | |
1044 | log_close_all(void) | |
1045 | { | |
1046 | if (mainlogfd >= 0) | |
1047 | { close(mainlogfd); mainlogfd = -1; } | |
1048 | if (rejectlogfd >= 0) | |
1049 | { close(rejectlogfd); rejectlogfd = -1; } | |
1050 | closelog(); | |
1051 | syslog_open = FALSE; | |
1052 | } | |
1053 | ||
1054 | /* End of log.c */ |