1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2012 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Functions for writing spool files, and moving them about. */
15 /*************************************************
16 * Deal with header writing errors *
17 *************************************************/
19 /* This function is called immediately after errors in writing the spool, with
20 errno still set. It creates and error message, depending on the circumstances.
21 If errmsg is NULL, it logs the message and panic-dies. Otherwise errmsg is set
22 to point to the message, and -1 is returned. This function makes the code of
23 spool_write_header() a bit neater.
26 where SW_RECEIVING, SW_DELIVERING, or SW_MODIFYING
27 errmsg where to put the message; NULL => panic-die
28 s text to add to log string
29 temp_name name of temp file to unlink
30 f FILE to close, if not NULL
32 Returns: -1 if errmsg is not NULL; otherwise doesn't return
36 spool_write_error(int where, uschar **errmsg, uschar *s, uschar *temp_name,
39 uschar *msg = (where == SW_RECEIVING)?
40 string_sprintf("spool file %s error while receiving from %s: %s", s,
41 (sender_fullhost != NULL)? sender_fullhost : sender_ident,
44 string_sprintf("spool file %s error while %s: %s", s,
45 (where == SW_DELIVERING)? "delivering" : "modifying",
48 if (temp_name != NULL) Uunlink(temp_name);
49 if (f != NULL) (void)fclose(f);
52 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", msg);
61 /*************************************************
62 * Open file under temporary name *
63 *************************************************/
65 /* This is used for opening spool files under a temporary name,
66 with a single attempt at deleting if they already exist.
68 Argument: temporary name for spool header file
69 Returns: file descriptor of open file, or < 0 on failure, with errno unchanged
73 spool_open_temp(uschar *temp_name)
75 int fd = Uopen(temp_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
77 /* If the file already exists, something has gone wrong. This process may well
78 have previously created the file if it is delivering more than one address, but
79 it should have renamed it almost immediately. A file could, however, be left
80 around as a result of a system crash, and by coincidence this process might
81 have the same pid. We therefore have one go at unlinking it before giving up.
84 if (fd < 0 && errno == EEXIST)
86 DEBUG(D_any) debug_printf("%s exists: unlinking\n", temp_name);
88 fd = Uopen(temp_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
91 /* If the file has been opened, make sure the file's group is the Exim gid, and
92 double-check the mode because the group setting doesn't always get set
96 if (fchown(fd, exim_uid, exim_gid) || fchmod(fd, SPOOL_MODE))
98 DEBUG(D_any) debug_printf("failed setting perms on %s\n", temp_name);
99 (void) close(fd); fd = -1;
108 /*************************************************
109 * Write the header spool file *
110 *************************************************/
112 /* Returns the size of the file for success; zero for failure. The file is
113 written under a temporary name, and then renamed. It's done this way so that it
114 works with re-writing the file on message deferral as well as for the initial
115 write. Whenever this function is called, the data file for the message should
116 be open and locked, thus preventing any other exim process from working on this
121 where SW_RECEIVING, SW_DELIVERING, or SW_MODIFYING
122 errmsg where to put an error message; if NULL, panic-die on error
124 Returns: the size of the header texts on success;
125 negative on writing failure, unless errmsg == NULL
129 spool_write_header(uschar *id, int where, uschar **errmsg)
138 uschar temp_name[256];
140 sprintf(CS temp_name, "%s/input/%s/hdr.%d", spool_directory, message_subdir,
142 fd = spool_open_temp(temp_name);
143 if (fd < 0) return spool_write_error(where, errmsg, US"open", NULL, NULL);
144 f = fdopen(fd, "wb");
145 DEBUG(D_receive|D_deliver) debug_printf("Writing spool header file\n");
147 /* We now have an open file to which the header data is to be written. Start
148 with the file's leaf name, to make the file self-identifying. Continue with the
149 identity of the submitting user, followed by the sender's address. The sender's
150 address is enclosed in <> because it might be the null address. Then write the
151 received time and the number of warning messages that have been sent. */
153 fprintf(f, "%s-H\n", message_id);
154 fprintf(f, "%.63s %ld %ld\n", originator_login, (long int)originator_uid,
155 (long int)originator_gid);
156 fprintf(f, "<%s>\n", sender_address);
157 fprintf(f, "%d %d\n", received_time, warning_count);
159 /* If there is information about a sending host, remember it. The HELO
160 data can be set for local SMTP as well as remote. */
162 if (sender_helo_name != NULL)
163 fprintf(f, "-helo_name %s\n", sender_helo_name);
165 if (sender_host_address != NULL)
167 fprintf(f, "-host_address %s.%d\n", sender_host_address, sender_host_port);
168 if (sender_host_name != NULL)
169 fprintf(f, "-host_name %s\n", sender_host_name);
170 if (sender_host_authenticated != NULL)
171 fprintf(f, "-host_auth %s\n", sender_host_authenticated);
174 /* Also about the interface a message came in on */
176 if (interface_address != NULL)
177 fprintf(f, "-interface_address %s.%d\n", interface_address, interface_port);
179 if (smtp_active_hostname != primary_hostname)
180 fprintf(f, "-active_hostname %s\n", smtp_active_hostname);
182 /* Likewise for any ident information; for local messages this is
183 likely to be the same as originator_login, but will be different if
184 the originator was root, forcing a different ident. */
186 if (sender_ident != NULL) fprintf(f, "-ident %s\n", sender_ident);
188 /* Ditto for the received protocol */
190 if (received_protocol != NULL)
191 fprintf(f, "-received_protocol %s\n", received_protocol);
193 /* Preserve any ACL variables that are set. */
195 tree_walk(acl_var_c, &acl_var_write, f);
196 tree_walk(acl_var_m, &acl_var_write, f);
198 /* Now any other data that needs to be remembered. */
200 fprintf(f, "-body_linecount %d\n", body_linecount);
201 fprintf(f, "-max_received_linelength %d\n", max_received_linelength);
203 if (body_zerocount > 0) fprintf(f, "-body_zerocount %d\n", body_zerocount);
205 if (authenticated_id != NULL)
206 fprintf(f, "-auth_id %s\n", authenticated_id);
207 if (authenticated_sender != NULL)
208 fprintf(f, "-auth_sender %s\n", authenticated_sender);
210 if (allow_unqualified_recipient) fprintf(f, "-allow_unqualified_recipient\n");
211 if (allow_unqualified_sender) fprintf(f, "-allow_unqualified_sender\n");
212 if (deliver_firsttime) fprintf(f, "-deliver_firsttime\n");
213 if (deliver_freeze) fprintf(f, "-frozen %d\n", deliver_frozen_at);
214 if (dont_deliver) fprintf(f, "-N\n");
215 if (host_lookup_deferred) fprintf(f, "-host_lookup_deferred\n");
216 if (host_lookup_failed) fprintf(f, "-host_lookup_failed\n");
217 if (sender_local) fprintf(f, "-local\n");
218 if (local_error_message) fprintf(f, "-localerror\n");
219 if (local_scan_data != NULL) fprintf(f, "-local_scan %s\n", local_scan_data);
220 #ifdef WITH_CONTENT_SCAN
221 if (spam_score_int != NULL) fprintf(f,"-spam_score_int %s\n", spam_score_int);
223 if (deliver_manual_thaw) fprintf(f, "-manual_thaw\n");
224 if (sender_set_untrusted) fprintf(f, "-sender_set_untrusted\n");
226 #ifdef EXPERIMENTAL_BRIGHTMAIL
227 if (bmi_verdicts != NULL) fprintf(f, "-bmi_verdicts %s\n", bmi_verdicts);
231 if (tls_in.certificate_verified) fprintf(f, "-tls_certificate_verified\n");
232 if (tls_in.cipher) fprintf(f, "-tls_cipher %s\n", tls_in.cipher);
235 (void) tls_export_cert(big_buffer, big_buffer_size, tls_in.peercert);
236 fprintf(f, "-tls_peercert %s\n", CS big_buffer);
238 if (tls_in.peerdn) fprintf(f, "-tls_peerdn %s\n", string_printing(tls_in.peerdn));
239 if (tls_in.sni) fprintf(f, "-tls_sni %s\n", string_printing(tls_in.sni));
242 (void) tls_export_cert(big_buffer, big_buffer_size, tls_in.ourcert);
243 fprintf(f, "-tls_ourcert %s\n", CS big_buffer);
245 if (tls_in.ocsp) fprintf(f, "-tls_ocsp %d\n", tls_in.ocsp);
248 #ifdef EXPERIMENTAL_DSN
249 /* Write the dsn flags to the spool header file */
250 DEBUG(D_deliver) debug_printf("DSN: Write SPOOL :-dsn_envid %s\n", dsn_envid);
251 if (dsn_envid != NULL) fprintf(f, "-dsn_envid %s\n", dsn_envid);
252 DEBUG(D_deliver) debug_printf("DSN: Write SPOOL :-dsn_ret %d\n", dsn_ret);
253 if (dsn_ret != 0) fprintf(f, "-dsn_ret %d\n", dsn_ret);
256 /* To complete the envelope, write out the tree of non-recipients, followed by
257 the list of recipients. These won't be disjoint the first time, when no
258 checking has been done. If a recipient is a "one-time" alias, it is followed by
259 a space and its parent address number (pno). */
261 tree_write(tree_nonrecipients, f);
262 fprintf(f, "%d\n", recipients_count);
263 for (i = 0; i < recipients_count; i++)
265 recipient_item *r = recipients_list + i;
266 #ifdef EXPERIMENTAL_DSN
267 DEBUG(D_deliver) debug_printf("DSN: Flags :%d\n", r->dsn_flags);
269 if (r->pno < 0 && r->errors_to == NULL
270 #ifdef EXPERIMENTAL_DSN
274 fprintf(f, "%s\n", r->address);
277 uschar *errors_to = (r->errors_to == NULL)? US"" : r->errors_to;
278 #ifdef EXPERIMENTAL_DSN
279 /* for DSN SUPPORT extend exim 4 spool in a compatible way by
280 adding new values upfront and add flag 0x02 */
281 uschar *orcpt = (r->orcpt == NULL)? US"" : r->orcpt;
282 fprintf(f, "%s %s %d,%d %s %d,%d#3\n", r->address, orcpt, Ustrlen(orcpt), r->dsn_flags,
283 errors_to, Ustrlen(errors_to), r->pno);
285 fprintf(f, "%s %s %d,%d#1\n", r->address, errors_to,
286 Ustrlen(errors_to), r->pno);
290 #ifdef EXPERIMENTAL_DSN
291 DEBUG(D_deliver) debug_printf("DSN: **** SPOOL_OUT - address: |%s| errorsto: |%s| orcpt: |%s| dsn_flags: %d\n",
292 r->address, r->errors_to, r->orcpt, r->dsn_flags);
296 /* Put a blank line before the headers */
300 /* Save the size of the file so far so we can subtract it from the final length
301 to get the actual size of the headers. */
305 size_correction = statbuf.st_size;
307 /* Finally, write out the message's headers. To make it easier to read them
308 in again, precede each one with the count of its length. Make the count fixed
309 length to aid human eyes when debugging and arrange for it not be included in
310 the size. It is followed by a space for normal headers, a flagging letter for
311 various other headers, or an asterisk for old headers that have been rewritten.
312 These are saved as a record for debugging. Don't included them in the message's
315 for (h = header_list; h != NULL; h = h->next)
317 fprintf(f, "%03d%c %s", h->slen, h->type, h->text);
318 size_correction += 5;
319 if (h->type == '*') size_correction += h->slen;
322 /* Flush and check for any errors while writing */
324 if (fflush(f) != 0 || ferror(f))
325 return spool_write_error(where, errmsg, US"write", temp_name, f);
327 /* Force the file's contents to be written to disk. Note that fflush()
328 just pushes it out of C, and fclose() doesn't guarantee to do the write
329 either. That's just the way Unix works... */
331 if (EXIMfsync(fileno(f)) < 0)
332 return spool_write_error(where, errmsg, US"sync", temp_name, f);
334 /* Get the size of the file, and close it. */
338 return spool_write_error(where, errmsg, US"close", temp_name, NULL);
340 /* Rename the file to its correct name, thereby replacing any previous
343 sprintf(CS name, "%s/input/%s/%s-H", spool_directory, message_subdir, id);
345 if (Urename(temp_name, name) < 0)
346 return spool_write_error(where, errmsg, US"rename", temp_name, NULL);
348 /* Linux (and maybe other OS?) does not automatically sync a directory after
349 an operation like rename. We therefore have to do it forcibly ourselves in
350 these cases, to make sure the file is actually accessible on disk, as opposed
351 to just the data being accessible from a file in lost+found. Linux also has
352 O_DIRECTORY, for opening a directory.
354 However, it turns out that some file systems (some versions of NFS?) do not
355 support directory syncing. It seems safe enough to ignore EINVAL to cope with
356 these cases. One hack on top of another... but that's life. */
358 #ifdef NEED_SYNC_DIRECTORY
360 sprintf(CS temp_name, "%s/input/%s/.", spool_directory, message_subdir);
363 #define O_DIRECTORY 0
366 if ((fd = Uopen(temp_name, O_RDONLY|O_DIRECTORY, 0)) < 0)
367 return spool_write_error(where, errmsg, US"directory open", name, NULL);
369 if (EXIMfsync(fd) < 0 && errno != EINVAL)
370 return spool_write_error(where, errmsg, US"directory sync", name, NULL);
373 return spool_write_error(where, errmsg, US"directory close", name, NULL);
375 #endif /* NEED_SYNC_DIRECTORY */
377 /* Return the number of characters in the headers, which is the file size, less
378 the prelimary stuff, less the additional count fields on the headers. */
380 DEBUG(D_receive) debug_printf("Size of headers = %d\n",
381 (int)(statbuf.st_size - size_correction));
383 return statbuf.st_size - size_correction;
387 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
389 /************************************************
391 ************************************************/
393 /* Used by spool_move_message() below. Note re the use of sprintf(): the value
394 of spool_directory is checked to ensure that it is less than 200 characters at
398 dir base directory name
399 subdir subdirectory name
401 suffix suffix to add to id
402 from source directory prefix
403 to destination directory prefix
404 noentok if TRUE, absence of file is not an error
406 Returns: TRUE if all went well
407 FALSE, having panic logged if not
411 make_link(uschar *dir, uschar *subdir, uschar *id, uschar *suffix, uschar *from,
412 uschar *to, BOOL noentok)
414 uschar f[256], t[256];
415 sprintf(CS f, "%s/%s%s/%s/%s%s", spool_directory, from, dir, subdir, id, suffix);
416 sprintf(CS t, "%s/%s%s/%s/%s%s", spool_directory, to, dir, subdir, id, suffix);
417 if (Ulink(f, t) < 0 && (!noentok || errno != ENOENT))
419 log_write(0, LOG_MAIN|LOG_PANIC, "link(\"%s\", \"%s\") failed while moving "
420 "message: %s", f, t, strerror(errno));
428 /************************************************
430 ************************************************/
432 /* Used by spool_move_message() below. Note re the use of sprintf(): the value
433 of spool_directory is checked to ensure that it is less than 200 characters at
437 dir base directory name
438 subdir subdirectory name
440 suffix suffix to add to id
441 from source directory prefix
442 noentok if TRUE, absence of file is not an error
444 Returns: TRUE if all went well
445 FALSE, having panic logged if not
449 break_link(uschar *dir, uschar *subdir, uschar *id, uschar *suffix, uschar *from,
453 sprintf(CS f, "%s/%s%s/%s/%s%s", spool_directory, from, dir, subdir, id, suffix);
454 if (Uunlink(f) < 0 && (!noentok || errno != ENOENT))
456 log_write(0, LOG_MAIN|LOG_PANIC, "unlink(\"%s\") failed while moving "
457 "message: %s", f, strerror(errno));
465 /************************************************
466 * Move message files *
467 ************************************************/
469 /* Move the files for a message (-H, -D, and msglog) from one directory (or
470 hierarchy) to another. It is assume that there is no -J file in existence when
471 this is done. At present, this is used only when move_frozen_messages is set,
472 so compile it only when that support is configured.
475 id the id of the message to be delivered
476 subdir the subdirectory name, or an empty string
477 from a prefix for "input" or "msglog" for where the message is now
478 to a prefix for "input" or "msglog" for where the message is to go
480 Returns: TRUE if all is well
481 FALSE if not, with error logged in panic and main logs
485 spool_move_message(uschar *id, uschar *subdir, uschar *from, uschar *to)
487 /* Create any output directories that do not exist. */
489 sprintf(CS big_buffer, "%sinput/%s", to, subdir);
490 (void)directory_make(spool_directory, big_buffer, INPUT_DIRECTORY_MODE, TRUE);
491 sprintf(CS big_buffer, "%smsglog/%s", to, subdir);
492 (void)directory_make(spool_directory, big_buffer, INPUT_DIRECTORY_MODE, TRUE);
494 /* Move the message by first creating new hard links for all the files, and
495 then removing the old links. When moving messages onto the main spool, the -H
496 file should be set up last, because that's the one that tells Exim there is a
497 message to be delivered, so we create its new link last and remove its old link
498 first. Programs that look at the alternate directories should follow the same
499 rule of waiting for a -H file before doing anything. When moving messsages off
500 the mail spool, the -D file should be open and locked at the time, thus keeping
503 if (!make_link(US"msglog", subdir, id, US"", from, to, TRUE) ||
504 !make_link(US"input", subdir, id, US"-D", from, to, FALSE) ||
505 !make_link(US"input", subdir, id, US"-H", from, to, FALSE))
508 if (!break_link(US"input", subdir, id, US"-H", from, FALSE) ||
509 !break_link(US"input", subdir, id, US"-D", from, FALSE) ||
510 !break_link(US"msglog", subdir, id, US"", from, TRUE))
513 log_write(0, LOG_MAIN, "moved from %sinput, %smsglog to %sinput, %smsglog",
521 /* End of spool_out.c */