src/src/spool_in.c

   1 /* $Cambridge: exim/src/src/spool_in.c,v 1.16 2006/09/19 11:28:45 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2006 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10 /* Functions for reading spool files. When compiling for a utility (eximon),
  11 not all are needed, and some functionality can be cut out. */
  12
  13
  14 #include "exim.h"
  15
  16
  17
  18 #ifndef COMPILE_UTILITY
  19 /*************************************************
  20 *           Open and lock data file              *
  21 *************************************************/
  22
  23 /* The data file is the one that is used for locking, because the header file
  24 can get replaced during delivery because of header rewriting. The file has
  25 to opened with write access so that we can get an exclusive lock, but in
  26 fact it won't be written to. Just in case there's a major disaster (e.g.
  27 overwriting some other file descriptor with the value of this one), open it
  28 with append.
  29
  30 Argument: the id of the message
  31 Returns:  TRUE if file successfully opened and locked
  32
  33 Side effect: deliver_datafile is set to the fd of the open file.
  34 */
  35
  36 BOOL
  37 spool_open_datafile(uschar *id)
  38 {
  39 int i;
  40 struct stat statbuf;
  41 flock_t lock_data;
  42 uschar spoolname[256];
  43
  44 /* If split_spool_directory is set, first look for the file in the appropriate
  45 sub-directory of the input directory. If it is not found there, try the input
  46 directory itself, to pick up leftovers from before the splitting. If split_
  47 spool_directory is not set, first look in the main input directory. If it is
  48 not found there, try the split sub-directory, in case it is left over from a
  49 splitting state. */
  50
  51 for (i = 0; i < 2; i++)
  52   {
  53   int save_errno;
  54   message_subdir[0] = (split_spool_directory == (i == 0))? id[5] : 0;
  55   sprintf(CS spoolname, "%s/input/%s/%s-D", spool_directory, message_subdir, id);
  56   deliver_datafile = Uopen(spoolname, O_RDWR | O_APPEND, 0);
  57   if (deliver_datafile >= 0) break;
  58   save_errno = errno;
  59   if (errno == ENOENT)
  60     {
  61     if (i == 0) continue;
  62     if (!queue_running)
  63       log_write(0, LOG_MAIN, "Spool file %s-D not found", id);
  64     }
  65   else log_write(0, LOG_MAIN, "Spool error for %s: %s", spoolname,
  66     strerror(errno));
  67   errno = save_errno;
  68   return FALSE;
  69   }
  70
  71 /* File is open and message_subdir is set. Set the close-on-exec flag, and lock
  72 the file. We lock only the first line of the file (containing the message ID)
  73 because this apparently is needed for running Exim under Cygwin. If the entire
  74 file is locked in one process, a sub-process cannot access it, even when passed
  75 an open file descriptor (at least, I think that's the Cygwin story). On real
  76 Unix systems it doesn't make any difference as long as Exim is consistent in
  77 what it locks. */
  78
  79 (void)fcntl(deliver_datafile, F_SETFD, fcntl(deliver_datafile, F_GETFD) |
  80   FD_CLOEXEC);
  81
  82 lock_data.l_type = F_WRLCK;
  83 lock_data.l_whence = SEEK_SET;
  84 lock_data.l_start = 0;
  85 lock_data.l_len = SPOOL_DATA_START_OFFSET;
  86
  87 if (fcntl(deliver_datafile, F_SETLK, &lock_data) < 0)
  88   {
  89   log_write(L_skip_delivery,
  90             LOG_MAIN,
  91             "Spool file is locked (another process is handling this message)");
  92   (void)close(deliver_datafile);
  93   deliver_datafile = -1;
  94   errno = 0;
  95   return FALSE;
  96   }
  97
  98 /* Get the size of the data; don't include the leading filename line
  99 in the count, but add one for the newline before the data. */
 100
 101 if (fstat(deliver_datafile, &statbuf) == 0)
 102   {
 103   message_body_size = statbuf.st_size - SPOOL_DATA_START_OFFSET;
 104   message_size = message_body_size + 1;
 105   }
 106
 107 return TRUE;
 108 }
 109 #endif  /* COMPILE_UTILITY */
 110
 111
 112
 113 /*************************************************
 114 *    Read non-recipients tree from spool file    *
 115 *************************************************/
 116
 117 /* The tree of non-recipients is written to the spool file in a form that
 118 makes it easy to read back into a tree. The format is as follows:
 119
 120    . Each node is preceded by two letter(Y/N) indicating whether it has left
 121      or right children. There's one space after the two flags, before the name.
 122
 123    . The left subtree (if any) then follows, then the right subtree (if any).
 124
 125 This function is entered with the next input line in the buffer. Note we must
 126 save the right flag before recursing with the same buffer.
 127
 128 Once the tree is read, we re-construct the balance fields by scanning the tree.
 129 I forgot to write them out originally, and the compatible fix is to do it this
 130 way. This initial local recursing function does the necessary.
 131
 132 Arguments:
 133   node      tree node
 134
 135 Returns:    maximum depth below the node, including the node itself
 136 */
 137
 138 static int
 139 count_below(tree_node *node)
 140 {
 141 int nleft, nright;
 142 if (node == NULL) return 0;
 143 nleft = count_below(node->left);
 144 nright = count_below(node->right);
 145 node->balance = (nleft > nright)? 1 : ((nright > nleft)? 2 : 0);
 146 return 1 + ((nleft > nright)? nleft : nright);
 147 }
 148
 149 /* This is the real function...
 150
 151 Arguments:
 152   connect      pointer to the root of the tree
 153   f            FILE to read data from
 154   buffer       contains next input line; further lines read into it
 155   buffer_size  size of the buffer
 156
 157 Returns:       FALSE on format error
 158 */
 159
 160 static BOOL
 161 read_nonrecipients_tree(tree_node **connect, FILE *f, uschar *buffer,
 162   int buffer_size)
 163 {
 164 tree_node *node;
 165 int n = Ustrlen(buffer);
 166 BOOL right = buffer[1] == 'Y';
 167
 168 if (n < 5) return FALSE;    /* malformed line */
 169 buffer[n-1] = 0;            /* Remove \n */
 170 node = store_get(sizeof(tree_node) + n - 3);
 171 *connect = node;
 172 Ustrcpy(node->name, buffer + 3);
 173 node->data.ptr = NULL;
 174
 175 if (buffer[0] == 'Y')
 176   {
 177   if (Ufgets(buffer, buffer_size, f) == NULL ||
 178     !read_nonrecipients_tree(&node->left, f, buffer, buffer_size))
 179       return FALSE;
 180   }
 181 else node->left = NULL;
 182
 183 if (right)
 184   {
 185   if (Ufgets(buffer, buffer_size, f) == NULL ||
 186     !read_nonrecipients_tree(&node->right, f, buffer, buffer_size))
 187       return FALSE;
 188   }
 189 else node->right = NULL;
 190
 191 (void) count_below(*connect);
 192 return TRUE;
 193 }
 194
 195
 196
 197
 198 /*************************************************
 199 *             Read spool header file             *
 200 *************************************************/
 201
 202 /* This function reads a spool header file and places the data into the
 203 appropriate global variables. The header portion is always read, but header
 204 structures are built only if read_headers is set true. It isn't, for example,
 205 while generating -bp output.
 206
 207 It may be possible for blocks of nulls (binary zeroes) to get written on the
 208 end of a file if there is a system crash during writing. It was observed on an
 209 earlier version of Exim that omitted to fsync() the files - this is thought to
 210 have been the cause of that incident, but in any case, this code must be robust
 211 against such an event, and if such a file is encountered, it must be treated as
 212 malformed.
 213
 214 Arguments:
 215   name          name of the header file, including the -H
 216   read_headers  TRUE if in-store header structures are to be built
 217   subdir_set    TRUE is message_subdir is already set
 218
 219 Returns:        spool_read_OK        success
 220                 spool_read_notopen   open failed
 221                 spool_read_enverror  error in the envelope portion
 222                 spool_read_hdrdrror  error in the header portion
 223 */
 224
 225 int
 226 spool_read_header(uschar *name, BOOL read_headers, BOOL subdir_set)
 227 {
 228 FILE *f = NULL;
 229 int n;
 230 int rcount = 0;
 231 long int uid, gid;
 232 BOOL inheader = FALSE;
 233 uschar *p;
 234
 235 /* Reset all the global variables to their default values. However, there is
 236 one exception. DO NOT change the default value of dont_deliver, because it may
 237 be forced by an external setting. */
 238
 239 acl_var_c = acl_var_m = NULL;
 240 authenticated_id = NULL;
 241 authenticated_sender = NULL;
 242 allow_unqualified_recipient = FALSE;
 243 allow_unqualified_sender = FALSE;
 244 body_linecount = 0;
 245 body_zerocount = 0;
 246 deliver_firsttime = FALSE;
 247 deliver_freeze = FALSE;
 248 deliver_frozen_at = 0;
 249 deliver_manual_thaw = FALSE;
 250 /* dont_deliver must NOT be reset */
 251 header_list = header_last = NULL;
 252 host_lookup_deferred = FALSE;
 253 host_lookup_failed = FALSE;
 254 interface_address = NULL;
 255 interface_port = 0;
 256 local_error_message = FALSE;
 257 local_scan_data = NULL;
 258 message_linecount = 0;
 259 received_protocol = NULL;
 260 received_count = 0;
 261 recipients_list = NULL;
 262 sender_address = NULL;
 263 sender_fullhost = NULL;
 264 sender_helo_name = NULL;
 265 sender_host_address = NULL;
 266 sender_host_name = NULL;
 267 sender_host_port = 0;
 268 sender_host_authenticated = NULL;
 269 sender_ident = NULL;
 270 sender_local = FALSE;
 271 sender_set_untrusted = FALSE;
 272 smtp_active_hostname = primary_hostname;
 273 tree_nonrecipients = NULL;
 274
 275 #ifdef EXPERIMENTAL_BRIGHTMAIL
 276 bmi_run = 0;
 277 bmi_verdicts = NULL;
 278 #endif
 279
 280 #ifdef EXPERIMENTAL_DOMAINKEYS
 281 dk_do_verify = 0;
 282 #endif
 283
 284 #ifdef SUPPORT_TLS
 285 tls_certificate_verified = FALSE;
 286 tls_cipher = NULL;
 287 tls_peerdn = NULL;
 288 #endif
 289
 290 #ifdef WITH_CONTENT_SCAN
 291 spam_score_int = NULL;
 292 #endif
 293
 294 /* Generate the full name and open the file. If message_subdir is already
 295 set, just look in the given directory. Otherwise, look in both the split
 296 and unsplit directories, as for the data file above. */
 297
 298 for (n = 0; n < 2; n++)
 299   {
 300   if (!subdir_set)
 301     message_subdir[0] = (split_spool_directory == (n == 0))? name[5] : 0;
 302   sprintf(CS big_buffer, "%s/input/%s/%s", spool_directory, message_subdir,
 303     name);
 304   f = Ufopen(big_buffer, "rb");
 305   if (f != NULL) break;
 306   if (n != 0 || subdir_set || errno != ENOENT) return spool_read_notopen;
 307   }
 308
 309 errno = 0;
 310
 311 #ifndef COMPILE_UTILITY
 312 DEBUG(D_deliver) debug_printf("reading spool file %s\n", name);
 313 #endif  /* COMPILE_UTILITY */
 314
 315 /* The first line of a spool file contains the message id followed by -H (i.e.
 316 the file name), in order to make the file self-identifying. */
 317
 318 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 319 if (Ustrlen(big_buffer) != MESSAGE_ID_LENGTH + 3 ||
 320     Ustrncmp(big_buffer, name, MESSAGE_ID_LENGTH + 2) != 0)
 321   goto SPOOL_FORMAT_ERROR;
 322
 323 /* The next three lines in the header file are in a fixed format. The first
 324 contains the login, uid, and gid of the user who caused the file to be written.
 325 There are known cases where a negative gid is used, so we allow for both
 326 negative uids and gids. The second contains the mail address of the message's
 327 sender, enclosed in <>. The third contains the time the message was received,
 328 and the number of warning messages for delivery delays that have been sent. */
 329
 330 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 331
 332 p = big_buffer + Ustrlen(big_buffer);
 333 while (p > big_buffer && isspace(p[-1])) p--;
 334 *p = 0;
 335 if (!isdigit(p[-1])) goto SPOOL_FORMAT_ERROR;
 336 while (p > big_buffer && (isdigit(p[-1]) || '-' == p[-1])) p--;
 337 gid = Uatoi(p);
 338 if (p <= big_buffer || *(--p) != ' ') goto SPOOL_FORMAT_ERROR;
 339 *p = 0;
 340 if (!isdigit(p[-1])) goto SPOOL_FORMAT_ERROR;
 341 while (p > big_buffer && (isdigit(p[-1]) || '-' == p[-1])) p--;
 342 uid = Uatoi(p);
 343 if (p <= big_buffer || *(--p) != ' ') goto SPOOL_FORMAT_ERROR;
 344 *p = 0;
 345
 346 originator_login = string_copy(big_buffer);
 347 originator_uid = (uid_t)uid;
 348 originator_gid = (gid_t)gid;
 349
 350 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 351 n = Ustrlen(big_buffer);
 352 if (n < 3 || big_buffer[0] != '<' || big_buffer[n-2] != '>')
 353   goto SPOOL_FORMAT_ERROR;
 354
 355 sender_address = store_get(n-2);
 356 Ustrncpy(sender_address, big_buffer+1, n-3);
 357 sender_address[n-3] = 0;
 358
 359 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 360 if (sscanf(CS big_buffer, "%d %d", &received_time, &warning_count) != 2)
 361   goto SPOOL_FORMAT_ERROR;
 362
 363 message_age = time(NULL) - received_time;
 364
 365 #ifndef COMPILE_UTILITY
 366 DEBUG(D_deliver) debug_printf("user=%s uid=%ld gid=%ld sender=%s\n",
 367   originator_login, (long int)originator_uid, (long int)originator_gid,
 368   sender_address);
 369 #endif  /* COMPILE_UTILITY */
 370
 371 /* Now there may be a number of optional lines, each starting with "-".
 372 If you add a new setting here, make sure you set the default above. */
 373
 374 for (;;)
 375   {
 376   if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 377   if (big_buffer[0] != '-') break;
 378   big_buffer[Ustrlen(big_buffer) - 1] = 0;
 379
 380   /* For long-term backward compatibility, we recognize "-acl", which was used
 381   before the number of ACL variables changed from 10 to 20. This was before the
 382   subsequent change to an arbitrary number of named variables. This code is
 383   retained so that upgrades from very old versions can still handle old-format
 384   spool files. The value given after "-acl" is a number that is 0-9 for
 385   connection variables, and 10-19 for message variables. */
 386
 387   if (Ustrncmp(big_buffer, "-acl ", 5) == 0)
 388     {
 389     int index, count;
 390     uschar name[4];
 391     tree_node *node;
 392
 393     if (sscanf(CS big_buffer + 5, "%d %d", &index, &count) != 2)
 394       goto SPOOL_FORMAT_ERROR;
 395
 396     (void) string_format(name, 4, "%c%d", (index < 10 ? 'c' : 'm'), index);
 397     node = acl_var_create(name);
 398     node->data.ptr = store_get(count + 1);
 399
 400     if (fread(node->data.ptr, 1, count+1, f) < count) goto SPOOL_READ_ERROR;
 401     ((uschar*)node->data.ptr)[count] = 0;
 402     }
 403
 404   /* Nowadays we use "-aclc" and "-aclm" for the different types of ACL
 405   variable, because Exim allows any number of them, with arbitrary names.
 406   The line in the spool file is "-acl[cm] <name> <length>". The name excludes
 407   the c or m. */
 408
 409   else if (Ustrncmp(big_buffer, "-aclc ", 6) == 0 ||
 410            Ustrncmp(big_buffer, "-aclm ", 6) == 0)
 411     {
 412     uschar *name, *endptr;
 413     int count;
 414     tree_node *node;
 415
 416     endptr = Ustrchr(big_buffer + 6, ' ');
 417     if (endptr == NULL) goto SPOOL_FORMAT_ERROR;
 418     name = string_sprintf("%c%.*s", big_buffer[4], endptr - big_buffer - 6,
 419       big_buffer + 6);
 420     if (sscanf(CS endptr, " %d", &count) != 1) goto SPOOL_FORMAT_ERROR;
 421
 422     node = acl_var_create(name);
 423     node->data.ptr = store_get(count + 1);
 424     if (fread(node->data.ptr, 1, count+1, f) < count) goto SPOOL_READ_ERROR;
 425     ((uschar*)node->data.ptr)[count] = 0;
 426     }
 427
 428   /* Other values */
 429
 430   else if (Ustrcmp(big_buffer, "-local") == 0) sender_local = TRUE;
 431   else if (Ustrcmp(big_buffer, "-localerror") == 0)
 432     local_error_message = TRUE;
 433   else if (Ustrncmp(big_buffer, "-local_scan ", 12) == 0)
 434     local_scan_data = string_copy(big_buffer + 12);
 435 #ifdef WITH_CONTENT_SCAN
 436   else if (Ustrncmp(big_buffer, "-spam_score_int ", 16) == 0)
 437     spam_score_int = string_copy(big_buffer + 16);
 438 #endif
 439 #ifdef EXPERIMENTAL_BRIGHTMAIL
 440   else if (Ustrncmp(big_buffer, "-bmi_verdicts ", 14) == 0)
 441     bmi_verdicts = string_copy(big_buffer + 14);
 442 #endif
 443   else if (Ustrcmp(big_buffer, "-host_lookup_deferred") == 0)
 444     host_lookup_deferred = TRUE;
 445   else if (Ustrcmp(big_buffer, "-host_lookup_failed") == 0)
 446     host_lookup_failed = TRUE;
 447   else if (Ustrncmp(big_buffer, "-body_linecount", 15) == 0)
 448     body_linecount = Uatoi(big_buffer + 15);
 449   else if (Ustrncmp(big_buffer, "-body_zerocount", 15) == 0)
 450     body_zerocount = Uatoi(big_buffer + 15);
 451   else if (Ustrncmp(big_buffer, "-frozen", 7) == 0)
 452     {
 453     deliver_freeze = TRUE;
 454     deliver_frozen_at = Uatoi(big_buffer + 7);
 455     }
 456   else if (Ustrcmp(big_buffer, "-allow_unqualified_recipient") == 0)
 457     allow_unqualified_recipient = TRUE;
 458   else if (Ustrcmp(big_buffer, "-allow_unqualified_sender") == 0)
 459     allow_unqualified_sender = TRUE;
 460   else if (Ustrcmp(big_buffer, "-deliver_firsttime") == 0)
 461     deliver_firsttime = TRUE;
 462   else if (Ustrcmp(big_buffer, "-manual_thaw") == 0)
 463     deliver_manual_thaw = TRUE;
 464   else if (Ustrncmp(big_buffer, "-auth_id", 8) == 0)
 465     authenticated_id = string_copy(big_buffer + 9);
 466   else if (Ustrncmp(big_buffer, "-auth_sender", 12) == 0)
 467     authenticated_sender = string_copy(big_buffer + 13);
 468   else if (Ustrncmp(big_buffer, "-sender_set_untrusted", 21) == 0)
 469     sender_set_untrusted = TRUE;
 470
 471   #ifdef SUPPORT_TLS
 472   else if (Ustrncmp(big_buffer, "-tls_certificate_verified", 25) == 0)
 473     tls_certificate_verified = TRUE;
 474   else if (Ustrncmp(big_buffer, "-tls_cipher", 11) == 0)
 475     tls_cipher = string_copy(big_buffer + 12);
 476   else if (Ustrncmp(big_buffer, "-tls_peerdn", 11) == 0)
 477     tls_peerdn = string_copy(big_buffer + 12);
 478   #endif
 479
 480   /* We now record the port number after the address, separated by a
 481   dot. For compatibility during upgrading, do nothing if there
 482   isn't a value (it gets left at zero). */
 483
 484   else if (Ustrncmp(big_buffer, "-host_address", 13) == 0)
 485     {
 486     sender_host_port = host_address_extract_port(big_buffer + 14);
 487     sender_host_address = string_copy(big_buffer + 14);
 488     }
 489
 490   else if (Ustrncmp(big_buffer, "-interface_address", 18) == 0)
 491     {
 492     interface_port = host_address_extract_port(big_buffer + 19);
 493     interface_address = string_copy(big_buffer + 19);
 494     }
 495
 496   else if (Ustrncmp(big_buffer, "-active_hostname", 16) == 0)
 497     smtp_active_hostname = string_copy(big_buffer + 17);
 498   else if (Ustrncmp(big_buffer, "-host_auth", 10) == 0)
 499     sender_host_authenticated = string_copy(big_buffer + 11);
 500   else if (Ustrncmp(big_buffer, "-host_name", 10) == 0)
 501     sender_host_name = string_copy(big_buffer + 11);
 502   else if (Ustrncmp(big_buffer, "-helo_name", 10) == 0)
 503     sender_helo_name = string_copy(big_buffer + 11);
 504   else if (Ustrncmp(big_buffer, "-ident", 6) == 0)
 505     sender_ident = string_copy(big_buffer + 7);
 506   else if (Ustrncmp(big_buffer, "-received_protocol", 18) == 0)
 507     received_protocol = string_copy(big_buffer + 19);
 508   else if (Ustrncmp(big_buffer, "-N", 2) == 0)
 509     dont_deliver = TRUE;
 510
 511   /* To allow new versions of Exim that add additional flags to interwork
 512   with older versions that do not understand them, just ignore any flagged
 513   lines that we don't recognize. Otherwise it wouldn't be possible to back
 514   off a new version that left new-style flags written on the spool. That's
 515   why the following line is commented out. */
 516
 517     /* else goto SPOOL_FORMAT_ERROR; */
 518   }
 519
 520 /* Build sender_fullhost if required */
 521
 522 #ifndef COMPILE_UTILITY
 523 host_build_sender_fullhost();
 524 #endif  /* COMPILE_UTILITY */
 525
 526 #ifndef COMPILE_UTILITY
 527 DEBUG(D_deliver)
 528   debug_printf("sender_local=%d ident=%s\n", sender_local,
 529     (sender_ident == NULL)? US"unset" : sender_ident);
 530 #endif  /* COMPILE_UTILITY */
 531
 532 /* We now have the tree of addresses NOT to deliver to, or a line
 533 containing "XX", indicating no tree. */
 534
 535 if (Ustrncmp(big_buffer, "XX\n", 3) != 0 &&
 536   !read_nonrecipients_tree(&tree_nonrecipients, f, big_buffer, big_buffer_size))
 537     goto SPOOL_FORMAT_ERROR;
 538
 539 #ifndef COMPILE_UTILITY
 540 DEBUG(D_deliver)
 541   {
 542   debug_printf("Non-recipients:\n");
 543   debug_print_tree(tree_nonrecipients);
 544   }
 545 #endif  /* COMPILE_UTILITY */
 546
 547 /* After reading the tree, the next line has not yet been read into the
 548 buffer. It contains the count of recipients which follow on separate lines. */
 549
 550 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 551 if (sscanf(CS big_buffer, "%d", &rcount) != 1) goto SPOOL_FORMAT_ERROR;
 552
 553 #ifndef COMPILE_UTILITY
 554 DEBUG(D_deliver) debug_printf("recipients_count=%d\n", rcount);
 555 #endif  /* COMPILE_UTILITY */
 556
 557 recipients_list_max = rcount;
 558 recipients_list = store_get(rcount * sizeof(recipient_item));
 559
 560 for (recipients_count = 0; recipients_count < rcount; recipients_count++)
 561   {
 562   int nn;
 563   int pno = -1;
 564   uschar *errors_to = NULL;
 565   uschar *p;
 566
 567   if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 568   nn = Ustrlen(big_buffer);
 569   if (nn < 2) goto SPOOL_FORMAT_ERROR;
 570
 571   /* Remove the newline; this terminates the address if there is no additional
 572   data on the line. */
 573
 574   p = big_buffer + nn - 1;
 575   *p-- = 0;
 576
 577   /* Look back from the end of the line for digits and special terminators.
 578   Since an address must end with a domain, we can tell that extra data is
 579   present by the presence of the terminator, which is always some character
 580   that cannot exist in a domain. (If I'd thought of the need for additional
 581   data early on, I'd have put it at the start, with the address at the end. As
 582   it is, we have to operate backwards. Addresses are permitted to contain
 583   spaces, you see.)
 584
 585   This code has to cope with various versions of this data that have evolved
 586   over time. In all cases, the line might just contain an address, with no
 587   additional data. Otherwise, the possibilities are as follows:
 588
 589   Exim 3 type:       <address><space><digits>,<digits>,<digits>
 590
 591     The second set of digits is the parent number for one_time addresses. The
 592     other values were remnants of earlier experiments that were abandoned.
 593
 594   Exim 4 first type: <address><space><digits>
 595
 596     The digits are the parent number for one_time addresses.
 597
 598   Exim 4 new type:   <address><space><data>#<type bits>
 599
 600     The type bits indicate what the contents of the data are.
 601
 602     Bit 01 indicates that, reading from right to left, the data
 603       ends with <errors_to address><space><len>,<pno> where pno is
 604       the parent number for one_time addresses, and len is the length
 605       of the errors_to address (zero meaning none).
 606    */
 607
 608   while (isdigit(*p)) p--;
 609
 610   /* Handle Exim 3 spool files */
 611
 612   if (*p == ',')
 613     {
 614     int dummy;
 615     while (isdigit(*(--p)) || *p == ',');
 616     if (*p == ' ')
 617       {
 618       *p++ = 0;
 619       (void)sscanf(CS p, "%d,%d", &dummy, &pno);
 620       }
 621     }
 622
 623   /* Handle early Exim 4 spool files */
 624
 625   else if (*p == ' ')
 626     {
 627     *p++ = 0;
 628     (void)sscanf(CS p, "%d", &pno);
 629     }
 630
 631   /* Handle current format Exim 4 spool files */
 632
 633   else if (*p == '#')
 634     {
 635     int flags;
 636     (void)sscanf(CS p+1, "%d", &flags);
 637
 638     if ((flags & 0x01) != 0)      /* one_time data exists */
 639       {
 640       int len;
 641       while (isdigit(*(--p)) || *p == ',' || *p == '-');
 642       (void)sscanf(CS p+1, "%d,%d", &len, &pno);
 643       *p = 0;
 644       if (len > 0)
 645         {
 646         p -= len;
 647         errors_to = string_copy(p);
 648         }
 649       }
 650
 651     *(--p) = 0;   /* Terminate address */
 652     }
 653
 654   recipients_list[recipients_count].address = string_copy(big_buffer);
 655   recipients_list[recipients_count].pno = pno;
 656   recipients_list[recipients_count].errors_to = errors_to;
 657   }
 658
 659 /* The remainder of the spool header file contains the headers for the message,
 660 separated off from the previous data by a blank line. Each header is preceded
 661 by a count of its length and either a certain letter (for various identified
 662 headers), space (for a miscellaneous live header) or an asterisk (for a header
 663 that has been rewritten). Count the Received: headers. We read the headers
 664 always, in order to check on the format of the file, but only create a header
 665 list if requested to do so. */
 666
 667 inheader = TRUE;
 668 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 669 if (big_buffer[0] != '\n') goto SPOOL_FORMAT_ERROR;
 670
 671 while ((n = fgetc(f)) != EOF)
 672   {
 673   header_line *h;
 674   uschar flag[4];
 675   int i;
 676
 677   if (!isdigit(n)) goto SPOOL_FORMAT_ERROR;
 678   (void)ungetc(n, f);
 679   (void)fscanf(f, "%d%c ", &n, flag);
 680   if (flag[0] != '*') message_size += n;  /* Omit non-transmitted headers */
 681
 682   if (read_headers)
 683     {
 684     h = store_get(sizeof(header_line));
 685     h->next = NULL;
 686     h->type = flag[0];
 687     h->slen = n;
 688     h->text = store_get(n+1);
 689
 690     if (h->type == htype_received) received_count++;
 691
 692     if (header_list == NULL) header_list = h;
 693       else header_last->next = h;
 694     header_last = h;
 695
 696     for (i = 0; i < n; i++)
 697       {
 698       int c = fgetc(f);
 699       if (c == 0 || c == EOF) goto SPOOL_FORMAT_ERROR;
 700       if (c == '\n' && h->type != htype_old) message_linecount++;
 701       h->text[i] = c;
 702       }
 703     h->text[i] = 0;
 704     }
 705
 706   /* Not requiring header data, just skip through the bytes */
 707
 708   else for (i = 0; i < n; i++)
 709     {
 710     int c = fgetc(f);
 711     if (c == 0 || c == EOF) goto SPOOL_FORMAT_ERROR;
 712     }
 713   }
 714
 715 /* We have successfully read the data in the header file. Update the message
 716 line count by adding the body linecount to the header linecount. Close the file
 717 and give a positive response. */
 718
 719 #ifndef COMPILE_UTILITY
 720 DEBUG(D_deliver) debug_printf("body_linecount=%d message_linecount=%d\n",
 721   body_linecount, message_linecount);
 722 #endif  /* COMPILE_UTILITY */
 723
 724 message_linecount += body_linecount;
 725
 726 fclose(f);
 727 return spool_read_OK;
 728
 729
 730 /* There was an error reading the spool or there was missing data,
 731 or there was a format error. A "read error" with no errno means an
 732 unexpected EOF, which we treat as a format error. */
 733
 734 SPOOL_READ_ERROR:
 735 if (errno != 0)
 736   {
 737   n = errno;
 738
 739   #ifndef COMPILE_UTILITY
 740   DEBUG(D_any) debug_printf("Error while reading spool file %s\n", name);
 741   #endif  /* COMPILE_UTILITY */
 742
 743   fclose(f);
 744   errno = n;
 745   return inheader? spool_read_hdrerror : spool_read_enverror;
 746   }
 747
 748 SPOOL_FORMAT_ERROR:
 749
 750 #ifndef COMPILE_UTILITY
 751 DEBUG(D_any) debug_printf("Format error in spool file %s\n", name);
 752 #endif  /* COMPILE_UTILITY */
 753
 754 fclose(f);
 755 errno = ERRNO_SPOOLFORMAT;
 756 return inheader? spool_read_hdrerror : spool_read_enverror;
 757 }
 758
 759 /* End of spool_in.c */