src/src/spool_out.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2016 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8 /* Functions for writing spool files, and moving them about. */
   9
  10
  11 #include "exim.h"
  12
  13
  14
  15 /*************************************************
  16 *       Deal with header writing errors          *
  17 *************************************************/
  18
  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.
  24
  25 Arguments:
  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
  31
  32 Returns:      -1 if errmsg is not NULL; otherwise doesn't return
  33 */
  34
  35 static int
  36 spool_write_error(int where, uschar **errmsg, uschar *s, uschar *temp_name,
  37   FILE *f)
  38 {
  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,
  42     strerror(errno))
  43   :
  44   string_sprintf("spool file %s error while %s: %s", s,
  45     (where == SW_DELIVERING)? "delivering" : "modifying",
  46     strerror(errno));
  47
  48 if (temp_name != NULL) Uunlink(temp_name);
  49 if (f != NULL) (void)fclose(f);
  50
  51 if (errmsg == NULL)
  52   log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", msg);
  53 else
  54   *errmsg = msg;
  55
  56 return -1;
  57 }
  58
  59
  60
  61 /*************************************************
  62 *            Open file under temporary name      *
  63 *************************************************/
  64
  65 /* This is used for opening spool files under a temporary name,
  66 with a single attempt at deleting if they already exist.
  67
  68 Argument: temporary name for spool header file
  69 Returns:  file descriptor of open file, or < 0 on failure, with errno unchanged
  70 */
  71
  72 int
  73 spool_open_temp(uschar *temp_name)
  74 {
  75 int fd = Uopen(temp_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
  76
  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.
  82 */
  83
  84 if (fd < 0 && errno == EEXIST)
  85   {
  86   DEBUG(D_any) debug_printf("%s exists: unlinking\n", temp_name);
  87   Uunlink(temp_name);
  88   fd = Uopen(temp_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
  89   }
  90
  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
  93 automatically. */
  94
  95 if (fd >= 0)
  96   if (fchown(fd, exim_uid, exim_gid) || fchmod(fd, SPOOL_MODE))
  97     {
  98     DEBUG(D_any) debug_printf("failed setting perms on %s\n", temp_name);
  99     (void) close(fd); fd = -1;
 100     Uunlink(temp_name);
 101     }
 102
 103 return fd;
 104 }
 105
 106
 107
 108 /*************************************************
 109 *          Write the header spool file           *
 110 *************************************************/
 111
 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
 117 message.
 118
 119 Argument:
 120   id      the message id
 121   where   SW_RECEIVING, SW_DELIVERING, or SW_MODIFYING
 122   errmsg  where to put an error message; if NULL, panic-die on error
 123
 124 Returns:  the size of the header texts on success;
 125           negative on writing failure, unless errmsg == NULL
 126 */
 127
 128 int
 129 spool_write_header(uschar *id, int where, uschar **errmsg)
 130 {
 131 int fd;
 132 int i;
 133 int size_correction;
 134 FILE *f;
 135 header_line *h;
 136 struct stat statbuf;
 137 uschar * tname;
 138 uschar * fname;
 139
 140 tname = spool_fname(US"input", message_subdir,
 141                     string_sprintf("hdr.%d", (int)getpid()), US"");
 142
 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);
 147
 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. */
 153
 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);
 159
 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. */
 162
 163 if (sender_helo_name != NULL)
 164   fprintf(f, "-helo_name %s\n", sender_helo_name);
 165
 166 if (sender_host_address != NULL)
 167   {
 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);
 173   }
 174
 175 /* Also about the interface a message came in on */
 176
 177 if (interface_address != NULL)
 178   fprintf(f, "-interface_address %s.%d\n", interface_address, interface_port);
 179
 180 if (smtp_active_hostname != primary_hostname)
 181   fprintf(f, "-active_hostname %s\n", smtp_active_hostname);
 182
 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. */
 186
 187 if (sender_ident != NULL) fprintf(f, "-ident %s\n", sender_ident);
 188
 189 /* Ditto for the received protocol */
 190
 191 if (received_protocol != NULL)
 192   fprintf(f, "-received_protocol %s\n", received_protocol);
 193
 194 /* Preserve any ACL variables that are set. */
 195
 196 tree_walk(acl_var_c, &acl_var_write, f);
 197 tree_walk(acl_var_m, &acl_var_write, f);
 198
 199 /* Now any other data that needs to be remembered. */
 200
 201 fprintf(f, "-body_linecount %d\n", body_linecount);
 202 fprintf(f, "-max_received_linelength %d\n", max_received_linelength);
 203
 204 if (body_zerocount > 0) fprintf(f, "-body_zerocount %d\n", body_zerocount);
 205
 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);
 210
 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);
 225 #endif
 226 if (deliver_manual_thaw) fprintf(f, "-manual_thaw\n");
 227 if (sender_set_untrusted) fprintf(f, "-sender_set_untrusted\n");
 228
 229 #ifdef EXPERIMENTAL_BRIGHTMAIL
 230 if (bmi_verdicts != NULL) fprintf(f, "-bmi_verdicts %s\n", bmi_verdicts);
 231 #endif
 232
 233 #ifdef SUPPORT_TLS
 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);
 236 if (tls_in.peercert)
 237   {
 238   (void) tls_export_cert(big_buffer, big_buffer_size, tls_in.peercert);
 239   fprintf(f, "-tls_peercert %s\n", CS big_buffer);
 240   }
 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));
 243 if (tls_in.ourcert)
 244   {
 245   (void) tls_export_cert(big_buffer, big_buffer_size, tls_in.ourcert);
 246   fprintf(f, "-tls_ourcert %s\n", CS big_buffer);
 247   }
 248 if (tls_in.ocsp)         fprintf(f, "-tls_ocsp %d\n",   tls_in.ocsp);
 249 #endif
 250
 251 #ifdef SUPPORT_I18N
 252 if (message_smtputf8)
 253   {
 254   fprintf(f, "-smtputf8\n");
 255   if (message_utf8_downconvert)
 256     fprintf(f, "-utf8_%sdowncvt\n", message_utf8_downconvert < 0 ? "opt" : "");
 257   }
 258 #endif
 259
 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);
 265
 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). */
 270
 271 tree_write(tree_nonrecipients, f);
 272 fprintf(f, "%d\n", recipients_count);
 273 for (i = 0; i < recipients_count; i++)
 274   {
 275   recipient_item *r = recipients_list + i;
 276
 277   DEBUG(D_deliver) debug_printf("DSN: Flags :%d\n", r->dsn_flags);
 278
 279   if (r->pno < 0 && r->errors_to == NULL && r->dsn_flags == 0)
 280     fprintf(f, "%s\n", r->address);
 281   else
 282     {
 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"";
 287
 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);
 290     }
 291
 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);
 295   }
 296
 297 /* Put a blank line before the headers */
 298
 299 fprintf(f, "\n");
 300
 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. */
 303
 304 fflush(f);
 305 if (fstat(fd, &statbuf))
 306   return spool_write_error(where, errmsg, US"fstat", tname, f);
 307 size_correction = statbuf.st_size;
 308
 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
 315 size. */
 316
 317 for (h = header_list; h != NULL; h = h->next)
 318   {
 319   fprintf(f, "%03d%c %s", h->slen, h->type, h->text);
 320   size_correction += 5;
 321   if (h->type == '*') size_correction += h->slen;
 322   }
 323
 324 /* Flush and check for any errors while writing */
 325
 326 if (fflush(f) != 0 || ferror(f))
 327   return spool_write_error(where, errmsg, US"write", tname, f);
 328
 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... */
 332
 333 if (EXIMfsync(fileno(f)) < 0)
 334   return spool_write_error(where, errmsg, US"sync", tname, f);
 335
 336 /* Get the size of the file, and close it. */
 337
 338 if (fstat(fd, &statbuf) != 0)
 339   return spool_write_error(where, errmsg, US"fstat", tname, NULL);
 340 if (fclose(f) != 0)
 341   return spool_write_error(where, errmsg, US"close", tname, NULL);
 342
 343 /* Rename the file to its correct name, thereby replacing any previous
 344 incarnation. */
 345
 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);
 348
 349 if (Urename(tname, fname) < 0)
 350   return spool_write_error(where, errmsg, US"rename", tname, NULL);
 351
 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.
 357
 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. */
 361
 362 #ifdef NEED_SYNC_DIRECTORY
 363
 364 tname = spool_fname(US"input", message_subdir, US".", US"");
 365
 366 # ifndef O_DIRECTORY
 367 #  define O_DIRECTORY 0
 368 # endif
 369
 370 if ((fd = Uopen(tname, O_RDONLY|O_DIRECTORY, 0)) < 0)
 371   return spool_write_error(where, errmsg, US"directory open", fname, NULL);
 372
 373 if (EXIMfsync(fd) < 0 && errno != EINVAL)
 374   return spool_write_error(where, errmsg, US"directory sync", fname, NULL);
 375
 376 if (close(fd) < 0)
 377   return spool_write_error(where, errmsg, US"directory close", fname, NULL);
 378
 379 #endif  /* NEED_SYNC_DIRECTORY */
 380
 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. */
 383
 384 DEBUG(D_receive) debug_printf("Size of headers = %d\n",
 385   (int)(statbuf.st_size - size_correction));
 386
 387 return statbuf.st_size - size_correction;
 388 }
 389
 390
 391 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
 392
 393 /************************************************
 394 *              Make a hard link                 *
 395 ************************************************/
 396
 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
 399 start-up time.
 400
 401 Arguments:
 402   dir        base directory name
 403   subdir     subdirectory name
 404   id         message id
 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
 409
 410 Returns:     TRUE if all went well
 411              FALSE, having panic logged if not
 412 */
 413
 414 static BOOL
 415 make_link(uschar *dir, uschar *subdir, uschar *id, uschar *suffix, uschar *from,
 416   uschar *to, BOOL noentok)
 417 {
 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))
 421   {
 422   log_write(0, LOG_MAIN|LOG_PANIC, "link(\"%s\", \"%s\") failed while moving "
 423     "message: %s", fname, tname, strerror(errno));
 424   return FALSE;
 425   }
 426 return TRUE;
 427 }
 428
 429
 430
 431 /************************************************
 432 *                Break a link                   *
 433 ************************************************/
 434
 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
 437 start-up time.
 438
 439 Arguments:
 440   dir        base directory name
 441   subdir     subdirectory name
 442   id         message id
 443   suffix     suffix to add to id
 444   from       source directory prefix
 445   noentok    if TRUE, absence of file is not an error
 446
 447 Returns:     TRUE if all went well
 448              FALSE, having panic logged if not
 449 */
 450
 451 static BOOL
 452 break_link(uschar *dir, uschar *subdir, uschar *id, uschar *suffix, uschar *from,
 453   BOOL noentok)
 454 {
 455 uschar * fname = spool_fname(string_sprintf("%s%s", from, dir), subdir, id, suffix);
 456 if (Uunlink(fname) < 0 && (!noentok || errno != ENOENT))
 457   {
 458   log_write(0, LOG_MAIN|LOG_PANIC, "unlink(\"%s\") failed while moving "
 459     "message: %s", fname, strerror(errno));
 460   return FALSE;
 461   }
 462 return TRUE;
 463 }
 464
 465
 466
 467 /************************************************
 468 *            Move message files                 *
 469 ************************************************/
 470
 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.
 475
 476 Arguments:
 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
 481
 482 Returns:      TRUE if all is well
 483               FALSE if not, with error logged in panic and main logs
 484 */
 485
 486 BOOL
 487 spool_move_message(uschar *id, uschar *subdir, uschar *from, uschar *to)
 488 {
 489 /* Create any output directories that do not exist. */
 490
 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);
 497
 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
 505 Exim's hands off. */
 506
 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))
 510   return FALSE;
 511
 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))
 515   return FALSE;
 516
 517 log_write(0, LOG_MAIN, "moved from %sinput, %smsglog to %sinput, %smsglog",
 518    from, from, to, to);
 519
 520 return TRUE;
 521 }
 522
 523 #endif
 524
 525 /* End of spool_out.c */
 526 /* vi: aw ai sw=2
 527 */