1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
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)
140 tname = spool_fname(US"input", message_subdir,
141 string_sprintf("hdr.%d", (int)getpid()), US"");
143 if ((fd = spool_open_temp(tname)) < 0)
144 return spool_write_error(where, errmsg, US"open", NULL, NULL);
145 f = fdopen(fd, "wb");
146 DEBUG(D_receive|D_deliver) debug_printf("Writing spool header file: %s\n", tname);
148 /* We now have an open file to which the header data is to be written. Start
149 with the file's leaf name, to make the file self-identifying. Continue with the
150 identity of the submitting user, followed by the sender's address. The sender's
151 address is enclosed in <> because it might be the null address. Then write the
152 received time and the number of warning messages that have been sent. */
154 fprintf(f, "%s-H\n", message_id);
155 fprintf(f, "%.63s %ld %ld\n", originator_login, (long int)originator_uid,
156 (long int)originator_gid);
157 fprintf(f, "<%s>\n", sender_address);
158 fprintf(f, "%d %d\n", received_time, warning_count);
160 /* If there is information about a sending host, remember it. The HELO
161 data can be set for local SMTP as well as remote. */
163 if (sender_helo_name != NULL)
164 fprintf(f, "-helo_name %s\n", sender_helo_name);
166 if (sender_host_address != NULL)
168 fprintf(f, "-host_address %s.%d\n", sender_host_address, sender_host_port);
169 if (sender_host_name != NULL)
170 fprintf(f, "-host_name %s\n", sender_host_name);
171 if (sender_host_authenticated != NULL)
172 fprintf(f, "-host_auth %s\n", sender_host_authenticated);
175 /* Also about the interface a message came in on */
177 if (interface_address != NULL)
178 fprintf(f, "-interface_address %s.%d\n", interface_address, interface_port);
180 if (smtp_active_hostname != primary_hostname)
181 fprintf(f, "-active_hostname %s\n", smtp_active_hostname);
183 /* Likewise for any ident information; for local messages this is
184 likely to be the same as originator_login, but will be different if
185 the originator was root, forcing a different ident. */
187 if (sender_ident != NULL) fprintf(f, "-ident %s\n", sender_ident);
189 /* Ditto for the received protocol */
191 if (received_protocol != NULL)
192 fprintf(f, "-received_protocol %s\n", received_protocol);
194 /* Preserve any ACL variables that are set. */
196 tree_walk(acl_var_c, &acl_var_write, f);
197 tree_walk(acl_var_m, &acl_var_write, f);
199 /* Now any other data that needs to be remembered. */
201 fprintf(f, "-body_linecount %d\n", body_linecount);
202 fprintf(f, "-max_received_linelength %d\n", max_received_linelength);
204 if (body_zerocount > 0) fprintf(f, "-body_zerocount %d\n", body_zerocount);
206 if (authenticated_id != NULL)
207 fprintf(f, "-auth_id %s\n", authenticated_id);
208 if (authenticated_sender != NULL)
209 fprintf(f, "-auth_sender %s\n", authenticated_sender);
211 if (allow_unqualified_recipient) fprintf(f, "-allow_unqualified_recipient\n");
212 if (allow_unqualified_sender) fprintf(f, "-allow_unqualified_sender\n");
213 if (deliver_firsttime) fprintf(f, "-deliver_firsttime\n");
214 if (deliver_freeze) fprintf(f, "-frozen " TIME_T_FMT "\n", deliver_frozen_at);
215 if (dont_deliver) fprintf(f, "-N\n");
216 if (host_lookup_deferred) fprintf(f, "-host_lookup_deferred\n");
217 if (host_lookup_failed) fprintf(f, "-host_lookup_failed\n");
218 if (sender_local) fprintf(f, "-local\n");
219 if (local_error_message) fprintf(f, "-localerror\n");
220 if (local_scan_data != NULL) fprintf(f, "-local_scan %s\n", local_scan_data);
221 #ifdef WITH_CONTENT_SCAN
222 if (spam_bar) fprintf(f,"-spam_bar %s\n", spam_bar);
223 if (spam_score) fprintf(f,"-spam_score %s\n", spam_score);
224 if (spam_score_int) 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_in.certificate_verified) fprintf(f, "-tls_certificate_verified\n");
235 if (tls_in.cipher) fprintf(f, "-tls_cipher %s\n", tls_in.cipher);
238 (void) tls_export_cert(big_buffer, big_buffer_size, tls_in.peercert);
239 fprintf(f, "-tls_peercert %s\n", CS big_buffer);
241 if (tls_in.peerdn) fprintf(f, "-tls_peerdn %s\n", string_printing(tls_in.peerdn));
242 if (tls_in.sni) fprintf(f, "-tls_sni %s\n", string_printing(tls_in.sni));
245 (void) tls_export_cert(big_buffer, big_buffer_size, tls_in.ourcert);
246 fprintf(f, "-tls_ourcert %s\n", CS big_buffer);
248 if (tls_in.ocsp) fprintf(f, "-tls_ocsp %d\n", tls_in.ocsp);
252 if (message_smtputf8)
254 fprintf(f, "-smtputf8\n");
255 if (message_utf8_downconvert)
256 fprintf(f, "-utf8_%sdowncvt\n", message_utf8_downconvert < 0 ? "opt" : "");
260 /* Write the dsn flags to the spool header file */
261 DEBUG(D_deliver) debug_printf("DSN: Write SPOOL :-dsn_envid %s\n", dsn_envid);
262 if (dsn_envid != NULL) fprintf(f, "-dsn_envid %s\n", dsn_envid);
263 DEBUG(D_deliver) debug_printf("DSN: Write SPOOL :-dsn_ret %d\n", dsn_ret);
264 if (dsn_ret != 0) fprintf(f, "-dsn_ret %d\n", dsn_ret);
266 /* To complete the envelope, write out the tree of non-recipients, followed by
267 the list of recipients. These won't be disjoint the first time, when no
268 checking has been done. If a recipient is a "one-time" alias, it is followed by
269 a space and its parent address number (pno). */
271 tree_write(tree_nonrecipients, f);
272 fprintf(f, "%d\n", recipients_count);
273 for (i = 0; i < recipients_count; i++)
275 recipient_item *r = recipients_list + i;
277 DEBUG(D_deliver) debug_printf("DSN: Flags :%d\n", r->dsn_flags);
279 if (r->pno < 0 && r->errors_to == NULL && r->dsn_flags == 0)
280 fprintf(f, "%s\n", r->address);
283 uschar * errors_to = r->errors_to ? r->errors_to : US"";
284 /* for DSN SUPPORT extend exim 4 spool in a compatible way by
285 adding new values upfront and add flag 0x02 */
286 uschar * orcpt = r->orcpt ? r->orcpt : US"";
288 fprintf(f, "%s %s %d,%d %s %d,%d#3\n", r->address, orcpt, Ustrlen(orcpt),
289 r->dsn_flags, errors_to, Ustrlen(errors_to), r->pno);
292 DEBUG(D_deliver) debug_printf("DSN: **** SPOOL_OUT - "
293 "address: |%s| errorsto: |%s| orcpt: |%s| dsn_flags: %d\n",
294 r->address, r->errors_to, r->orcpt, r->dsn_flags);
297 /* Put a blank line before the headers */
301 /* Save the size of the file so far so we can subtract it from the final length
302 to get the actual size of the headers. */
305 if (fstat(fd, &statbuf))
306 return spool_write_error(where, errmsg, US"fstat", tname, f);
307 size_correction = statbuf.st_size;
309 /* Finally, write out the message's headers. To make it easier to read them
310 in again, precede each one with the count of its length. Make the count fixed
311 length to aid human eyes when debugging and arrange for it not be included in
312 the size. It is followed by a space for normal headers, a flagging letter for
313 various other headers, or an asterisk for old headers that have been rewritten.
314 These are saved as a record for debugging. Don't included them in the message's
317 for (h = header_list; h != NULL; h = h->next)
319 fprintf(f, "%03d%c %s", h->slen, h->type, h->text);
320 size_correction += 5;
321 if (h->type == '*') size_correction += h->slen;
324 /* Flush and check for any errors while writing */
326 if (fflush(f) != 0 || ferror(f))
327 return spool_write_error(where, errmsg, US"write", tname, f);
329 /* Force the file's contents to be written to disk. Note that fflush()
330 just pushes it out of C, and fclose() doesn't guarantee to do the write
331 either. That's just the way Unix works... */
333 if (EXIMfsync(fileno(f)) < 0)
334 return spool_write_error(where, errmsg, US"sync", tname, f);
336 /* Get the size of the file, and close it. */
338 if (fstat(fd, &statbuf) != 0)
339 return spool_write_error(where, errmsg, US"fstat", tname, NULL);
341 return spool_write_error(where, errmsg, US"close", tname, NULL);
343 /* Rename the file to its correct name, thereby replacing any previous
346 fname = spool_fname(US"input", message_subdir, id, US"-H");
347 DEBUG(D_receive|D_deliver) debug_printf("Renaming spool header file: %s\n", fname);
349 if (Urename(tname, fname) < 0)
350 return spool_write_error(where, errmsg, US"rename", tname, NULL);
352 /* Linux (and maybe other OS?) does not automatically sync a directory after
353 an operation like rename. We therefore have to do it forcibly ourselves in
354 these cases, to make sure the file is actually accessible on disk, as opposed
355 to just the data being accessible from a file in lost+found. Linux also has
356 O_DIRECTORY, for opening a directory.
358 However, it turns out that some file systems (some versions of NFS?) do not
359 support directory syncing. It seems safe enough to ignore EINVAL to cope with
360 these cases. One hack on top of another... but that's life. */
362 #ifdef NEED_SYNC_DIRECTORY
364 tname = spool_fname(US"input", message_subdir, US".", US"");
367 # define O_DIRECTORY 0
370 if ((fd = Uopen(tname, O_RDONLY|O_DIRECTORY, 0)) < 0)
371 return spool_write_error(where, errmsg, US"directory open", fname, NULL);
373 if (EXIMfsync(fd) < 0 && errno != EINVAL)
374 return spool_write_error(where, errmsg, US"directory sync", fname, NULL);
377 return spool_write_error(where, errmsg, US"directory close", fname, NULL);
379 #endif /* NEED_SYNC_DIRECTORY */
381 /* Return the number of characters in the headers, which is the file size, less
382 the prelimary stuff, less the additional count fields on the headers. */
384 DEBUG(D_receive) debug_printf("Size of headers = %d\n",
385 (int)(statbuf.st_size - size_correction));
387 return statbuf.st_size - size_correction;
391 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
393 /************************************************
395 ************************************************/
397 /* Used by spool_move_message() below. Note re the use of sprintf(): the value
398 of spool_directory is checked to ensure that it is less than 200 characters at
402 dir base directory name
403 subdir subdirectory name
405 suffix suffix to add to id
406 from source directory prefix
407 to destination directory prefix
408 noentok if TRUE, absence of file is not an error
410 Returns: TRUE if all went well
411 FALSE, having panic logged if not
415 make_link(uschar *dir, uschar *subdir, uschar *id, uschar *suffix, uschar *from,
416 uschar *to, BOOL noentok)
418 uschar * fname = spool_fname(string_sprintf("%s%s", from, dir), subdir, id, suffix);
419 uschar * tname = spool_fname(string_sprintf("%s%s", to, dir), subdir, id, suffix);
420 if (Ulink(fname, tname) < 0 && (!noentok || errno != ENOENT))
422 log_write(0, LOG_MAIN|LOG_PANIC, "link(\"%s\", \"%s\") failed while moving "
423 "message: %s", fname, tname, strerror(errno));
431 /************************************************
433 ************************************************/
435 /* Used by spool_move_message() below. Note re the use of sprintf(): the value
436 of spool_directory is checked to ensure that it is less than 200 characters at
440 dir base directory name
441 subdir subdirectory name
443 suffix suffix to add to id
444 from source directory prefix
445 noentok if TRUE, absence of file is not an error
447 Returns: TRUE if all went well
448 FALSE, having panic logged if not
452 break_link(uschar *dir, uschar *subdir, uschar *id, uschar *suffix, uschar *from,
455 uschar * fname = spool_fname(string_sprintf("%s%s", from, dir), subdir, id, suffix);
456 if (Uunlink(fname) < 0 && (!noentok || errno != ENOENT))
458 log_write(0, LOG_MAIN|LOG_PANIC, "unlink(\"%s\") failed while moving "
459 "message: %s", fname, strerror(errno));
467 /************************************************
468 * Move message files *
469 ************************************************/
471 /* Move the files for a message (-H, -D, and msglog) from one directory (or
472 hierarchy) to another. It is assume that there is no -J file in existence when
473 this is done. At present, this is used only when move_frozen_messages is set,
474 so compile it only when that support is configured.
477 id the id of the message to be delivered
478 subdir the subdirectory name, or an empty string
479 from a prefix for "input" or "msglog" for where the message is now
480 to a prefix for "input" or "msglog" for where the message is to go
482 Returns: TRUE if all is well
483 FALSE if not, with error logged in panic and main logs
487 spool_move_message(uschar *id, uschar *subdir, uschar *from, uschar *to)
489 /* Create any output directories that do not exist. */
491 (void) directory_make(spool_directory,
492 spool_sname(string_sprintf("%sinput", to), subdir),
493 INPUT_DIRECTORY_MODE, TRUE);
494 (void) directory_make(spool_directory,
495 spool_sname(string_sprintf("%smsglog", to), subdir),
496 INPUT_DIRECTORY_MODE, TRUE);
498 /* Move the message by first creating new hard links for all the files, and
499 then removing the old links. When moving messages onto the main spool, the -H
500 file should be set up last, because that's the one that tells Exim there is a
501 message to be delivered, so we create its new link last and remove its old link
502 first. Programs that look at the alternate directories should follow the same
503 rule of waiting for a -H file before doing anything. When moving messages off
504 the mail spool, the -D file should be open and locked at the time, thus keeping
507 if (!make_link(US"msglog", subdir, id, US"", from, to, TRUE) ||
508 !make_link(US"input", subdir, id, US"-D", from, to, FALSE) ||
509 !make_link(US"input", subdir, id, US"-H", from, to, FALSE))
512 if (!break_link(US"input", subdir, id, US"-H", from, FALSE) ||
513 !break_link(US"input", subdir, id, US"-D", from, FALSE) ||
514 !break_link(US"msglog", subdir, id, US"", from, TRUE))
517 log_write(0, LOG_MAIN, "moved from %sinput, %smsglog to %sinput, %smsglog",
525 /* End of spool_out.c */