| 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 */ |