1 /* $Cambridge: exim/src/src/spool_out.c,v 1.6 2005/02/17 11:58:26 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2005 */
8 /* See the file NOTICE for conditions of use and distribution. */
10 /* Functions for writing spool files, and moving them about. */
17 /*************************************************
18 * Deal with header writing errors *
19 *************************************************/
21 /* This function is called immediately after errors in writing the spool, with
22 errno still set. It creates and error message, depending on the circumstances.
23 If errmsg is NULL, it logs the message and panic-dies. Otherwise errmsg is set
24 to point to the message, and -1 is returned. This function makes the code of
25 spool_write_header() a bit neater.
28 where SW_RECEIVING, SW_DELIVERING, or SW_MODIFYING
29 errmsg where to put the message; NULL => panic-die
30 s text to add to log string
31 temp_name name of temp file to unlink
32 f FILE to close, if not NULL
34 Returns: -1 if errmsg is not NULL; otherwise doesn't return
38 spool_write_error(int where, uschar **errmsg, uschar *s, uschar *temp_name,
41 uschar *msg = (where == SW_RECEIVING)?
42 string_sprintf("spool file %s error while receiving from %s: %s", s,
43 (sender_fullhost != NULL)? sender_fullhost : sender_ident,
46 string_sprintf("spool file %s error while %s: %s", s,
47 (where == SW_DELIVERING)? "delivering" : "modifying",
50 if (temp_name != NULL) Uunlink(temp_name);
51 if (f != NULL) fclose(f);
54 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", msg);
63 /*************************************************
64 * Open file under temporary name *
65 *************************************************/
67 /* This is used for opening spool files under a temporary name,
68 with a single attempt at deleting if they already exist.
70 Argument: temporary name for spool header file
71 Returns: file descriptor of open file, or < 0 on failure, with errno unchanged
75 spool_open_temp(uschar *temp_name)
77 int fd = Uopen(temp_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
79 /* If the file already exists, something has gone wrong. This process may well
80 have previously created the file if it is delivering more than one address, but
81 it should have renamed it almost immediately. A file could, however, be left
82 around as a result of a system crash, and by coincidence this process might
83 have the same pid. We therefore have one go at unlinking it before giving up.
86 if (fd < 0 && errno == EEXIST)
88 DEBUG(D_any) debug_printf("%s exists: unlinking\n", temp_name);
90 fd = Uopen(temp_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
93 /* If the file has been opened, make sure the file's group is the Exim gid, and
94 double-check the mode because the group setting doesn't always get set
99 fchown(fd, exim_uid, exim_gid);
100 fchmod(fd, SPOOL_MODE);
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. Because the values may contain
194 newlines, we use an explicit length. */
196 for (i = 0; i < ACL_C_MAX + ACL_M_MAX; i++)
198 if (acl_var[i] != NULL)
199 fprintf(f, "-acl %d %d\n%s\n", i, Ustrlen(acl_var[i]), acl_var[i]);
202 /* Now any other data that needs to be remembered. */
204 fprintf(f, "-body_linecount %d\n", body_linecount);
206 if (body_zerocount > 0) fprintf(f, "-body_zerocount %d\n", body_zerocount);
208 if (authenticated_id != NULL)
209 fprintf(f, "-auth_id %s\n", authenticated_id);
210 if (authenticated_sender != NULL)
211 fprintf(f, "-auth_sender %s\n", authenticated_sender);
213 if (allow_unqualified_recipient) fprintf(f, "-allow_unqualified_recipient\n");
214 if (allow_unqualified_sender) fprintf(f, "-allow_unqualified_sender\n");
215 if (deliver_firsttime) fprintf(f, "-deliver_firsttime\n");
216 if (deliver_freeze) fprintf(f, "-frozen %d\n", deliver_frozen_at);
217 if (dont_deliver) fprintf(f, "-N\n");
218 if (host_lookup_deferred) fprintf(f, "-host_lookup_deferred\n");
219 if (host_lookup_failed) fprintf(f, "-host_lookup_failed\n");
220 if (sender_local) fprintf(f, "-local\n");
221 if (local_error_message) fprintf(f, "-localerror\n");
222 if (local_scan_data != NULL) fprintf(f, "-local_scan %s\n", local_scan_data);
223 #ifdef WITH_CONTENT_SCAN
224 if (spam_score_int != NULL) fprintf(f,"-spam_score_int %s\n", spam_score_int);
226 if (deliver_manual_thaw) fprintf(f, "-manual_thaw\n");
227 if (sender_set_untrusted) fprintf(f, "-sender_set_untrusted\n");
229 #ifdef EXPERIMENTAL_BRIGHTMAIL
230 if (bmi_verdicts != NULL) fprintf(f, "-bmi_verdicts %s\n", bmi_verdicts);
234 if (tls_certificate_verified) fprintf(f, "-tls_certificate_verified\n");
235 if (tls_cipher != NULL) fprintf(f, "-tls_cipher %s\n", tls_cipher);
236 if (tls_peerdn != NULL) fprintf(f, "-tls_peerdn %s\n", tls_peerdn);
239 /* To complete the envelope, write out the tree of non-recipients, followed by
240 the list of recipients. These won't be disjoint the first time, when no
241 checking has been done. If a recipient is a "one-time" alias, it is followed by
242 a space and its parent address number (pno). */
244 tree_write(tree_nonrecipients, f);
245 fprintf(f, "%d\n", recipients_count);
246 for (i = 0; i < recipients_count; i++)
248 recipient_item *r = recipients_list + i;
249 if (r->pno < 0 && r->errors_to == NULL)
250 fprintf(f, "%s\n", r->address);
253 uschar *errors_to = (r->errors_to == NULL)? US"" : r->errors_to;
254 fprintf(f, "%s %s %d,%d#1\n", r->address, errors_to,
255 Ustrlen(errors_to), r->pno);
259 /* Put a blank line before the headers */
263 /* Save the size of the file so far so we can subtract it from the final length
264 to get the actual size of the headers. */
268 size_correction = statbuf.st_size;
270 /* Finally, write out the message's headers. To make it easier to read them
271 in again, precede each one with the count of its length. Make the count fixed
272 length to aid human eyes when debugging and arrange for it not be included in
273 the size. It is followed by a space for normal headers, a flagging letter for
274 various other headers, or an asterisk for old headers that have been rewritten.
275 These are saved as a record for debugging. Don't included them in the message's
278 for (h = header_list; h != NULL; h = h->next)
280 fprintf(f, "%03d%c %s", h->slen, h->type, h->text);
281 size_correction += 5;
282 if (h->type == '*') size_correction += h->slen;
285 /* Flush and check for any errors while writing */
287 if (fflush(f) != 0 || ferror(f))
288 return spool_write_error(where, errmsg, US"write", temp_name, f);
290 /* Force the file's contents to be written to disk. Note that fflush()
291 just pushes it out of C, and fclose() doesn't guarantee to do the write
292 either. That's just the way Unix works... */
294 if (fsync(fileno(f)) < 0)
295 return spool_write_error(where, errmsg, US"sync", temp_name, f);
297 /* Get the size of the file, and close it. */
301 return spool_write_error(where, errmsg, US"close", temp_name, NULL);
303 /* Rename the file to its correct name, thereby replacing any previous
306 sprintf(CS name, "%s/input/%s/%s-H", spool_directory, message_subdir, id);
308 if (Urename(temp_name, name) < 0)
309 return spool_write_error(where, errmsg, US"rename", temp_name, NULL);
311 /* Linux (and maybe other OS?) does not automatically sync a directory after
312 an operation like rename. We therefore have to do it forcibly ourselves in
313 these cases, to make sure the file is actually accessible on disk, as opposed
314 to just the data being accessible from a file in lost+found. Linux also has
315 O_DIRECTORY, for opening a directory.
317 However, it turns out that some file systems (some versions of NFS?) do not
318 support directory syncing. It seems safe enough to ignore EINVAL to cope with
319 these cases. One hack on top of another... but that's life. */
321 #ifdef NEED_SYNC_DIRECTORY
323 sprintf(CS temp_name, "%s/input/%s/.", spool_directory, message_subdir);
326 #define O_DIRECTORY 0
329 if ((fd = Uopen(temp_name, O_RDONLY|O_DIRECTORY, 0)) < 0)
330 return spool_write_error(where, errmsg, US"directory open", name, NULL);
332 if (fsync(fd) < 0 && errno != EINVAL)
333 return spool_write_error(where, errmsg, US"directory sync", name, NULL);
336 return spool_write_error(where, errmsg, US"directory close", name, NULL);
338 #endif /* NEED_SYNC_DIRECTORY */
340 /* Return the number of characters in the headers, which is the file size, less
341 the prelimary stuff, less the additional count fields on the headers. */
343 DEBUG(D_receive) debug_printf("Size of headers = %d\n",
344 (int)(statbuf.st_size - size_correction));
346 return statbuf.st_size - size_correction;
350 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
352 /************************************************
354 ************************************************/
356 /* Used by spool_move_message() below. Note re the use of sprintf(): the value
357 of spool_directory is checked to ensure that it is less than 200 characters at
361 dir base directory name
362 subdir subdirectory name
364 suffix suffix to add to id
365 from source directory prefix
366 to destination directory prefix
367 noentok if TRUE, absence of file is not an error
369 Returns: TRUE if all went well
370 FALSE, having panic logged if not
374 make_link(uschar *dir, uschar *subdir, uschar *id, uschar *suffix, uschar *from,
375 uschar *to, BOOL noentok)
377 uschar f[256], t[256];
378 sprintf(CS f, "%s/%s%s/%s/%s%s", spool_directory, from, dir, subdir, id, suffix);
379 sprintf(CS t, "%s/%s%s/%s/%s%s", spool_directory, to, dir, subdir, id, suffix);
380 if (Ulink(f, t) < 0 && (!noentok || errno != ENOENT))
382 log_write(0, LOG_MAIN|LOG_PANIC, "link(\"%s\", \"%s\") failed while moving "
383 "message: %s", f, t, strerror(errno));
391 /************************************************
393 ************************************************/
395 /* Used by spool_move_message() below. Note re the use of sprintf(): the value
396 of spool_directory is checked to ensure that it is less than 200 characters at
400 dir base directory name
401 subdir subdirectory name
403 suffix suffix to add to id
404 from source directory prefix
405 noentok if TRUE, absence of file is not an error
407 Returns: TRUE if all went well
408 FALSE, having panic logged if not
412 break_link(uschar *dir, uschar *subdir, uschar *id, uschar *suffix, uschar *from,
416 sprintf(CS f, "%s/%s%s/%s/%s%s", spool_directory, from, dir, subdir, id, suffix);
417 if (Uunlink(f) < 0 && (!noentok || errno != ENOENT))
419 log_write(0, LOG_MAIN|LOG_PANIC, "unlink(\"%s\") failed while moving "
420 "message: %s", f, strerror(errno));
428 /************************************************
429 * Move message files *
430 ************************************************/
432 /* Move the files for a message (-H, -D, and msglog) from one directory (or
433 hierarchy) to another. It is assume that there is no -J file in existence when
434 this is done. At present, this is used only when move_frozen_messages is set,
435 so compile it only when that support is configured.
438 id the id of the message to be delivered
439 subdir the subdirectory name, or an empty string
440 from a prefix for "input" or "msglog" for where the message is now
441 to a prefix for "input" or "msglog" for where the message is to go
443 Returns: TRUE if all is well
444 FALSE if not, with error logged in panic and main logs
448 spool_move_message(uschar *id, uschar *subdir, uschar *from, uschar *to)
450 /* Create any output directories that do not exist. */
452 sprintf(CS big_buffer, "%sinput/%s", to, subdir);
453 (void)directory_make(spool_directory, big_buffer, INPUT_DIRECTORY_MODE, TRUE);
454 sprintf(CS big_buffer, "%smsglog/%s", to, subdir);
455 (void)directory_make(spool_directory, big_buffer, INPUT_DIRECTORY_MODE, TRUE);
457 /* Move the message by first creating new hard links for all the files, and
458 then removing the old links. When moving messages onto the main spool, the -H
459 file should be set up last, because that's the one that tells Exim there is a
460 message to be delivered, so we create its new link last and remove its old link
461 first. Programs that look at the alternate directories should follow the same
462 rule of waiting for a -H file before doing anything. When moving messsages off
463 the mail spool, the -D file should be open and locked at the time, thus keeping
466 if (!make_link(US"msglog", subdir, id, US"", from, to, TRUE) ||
467 !make_link(US"input", subdir, id, US"-D", from, to, FALSE) ||
468 !make_link(US"input", subdir, id, US"-H", from, to, FALSE))
471 if (!break_link(US"input", subdir, id, US"-H", from, FALSE) ||
472 !break_link(US"input", subdir, id, US"-D", from, FALSE) ||
473 !break_link(US"msglog", subdir, id, US"", from, TRUE))
476 log_write(0, LOG_MAIN, "moved from %sinput, %smsglog to %sinput, %smsglog",
484 /* End of spool_out.c */