src/src/spool_in.c

   1 /* $Cambridge: exim/src/src/spool_in.c,v 1.13 2005/08/09 13:31:53 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2005 */
   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 for (n = 0; n < ACL_C_MAX + ACL_M_MAX; n++) acl_var[n] = NULL;
 240
 241 authenticated_id = NULL;
 242 authenticated_sender = NULL;
 243 allow_unqualified_recipient = FALSE;
 244 allow_unqualified_sender = FALSE;
 245 body_linecount = 0;
 246 body_zerocount = 0;
 247 deliver_firsttime = FALSE;
 248 deliver_freeze = FALSE;
 249 deliver_frozen_at = 0;
 250 deliver_manual_thaw = FALSE;
 251 /* dont_deliver must NOT be reset */
 252 header_list = header_last = NULL;
 253 host_lookup_deferred = FALSE;
 254 host_lookup_failed = FALSE;
 255 interface_address = NULL;
 256 interface_port = 0;
 257 local_error_message = FALSE;
 258 local_scan_data = NULL;
 259 message_linecount = 0;
 260 received_protocol = NULL;
 261 received_count = 0;
 262 recipients_list = NULL;
 263 sender_address = NULL;
 264 sender_fullhost = NULL;
 265 sender_helo_name = NULL;
 266 sender_host_address = NULL;
 267 sender_host_name = NULL;
 268 sender_host_port = 0;
 269 sender_host_authenticated = NULL;
 270 sender_ident = NULL;
 271 sender_local = FALSE;
 272 sender_set_untrusted = FALSE;
 273 smtp_active_hostname = primary_hostname;
 274 tree_nonrecipients = NULL;
 275
 276 #ifdef EXPERIMENTAL_BRIGHTMAIL
 277 bmi_run = 0;
 278 bmi_verdicts = NULL;
 279 #endif
 280
 281 #ifdef EXPERIMENTAL_DOMAINKEYS
 282 dk_do_verify = 0;
 283 #endif
 284
 285 #ifdef SUPPORT_TLS
 286 tls_certificate_verified = FALSE;
 287 tls_cipher = NULL;
 288 tls_peerdn = NULL;
 289 #endif
 290
 291 #ifdef WITH_CONTENT_SCAN
 292 spam_score_int = NULL;
 293 #endif
 294
 295 /* Generate the full name and open the file. If message_subdir is already
 296 set, just look in the given directory. Otherwise, look in both the split
 297 and unsplit directories, as for the data file above. */
 298
 299 for (n = 0; n < 2; n++)
 300   {
 301   if (!subdir_set)
 302     message_subdir[0] = (split_spool_directory == (n == 0))? name[5] : 0;
 303   sprintf(CS big_buffer, "%s/input/%s/%s", spool_directory, message_subdir,
 304     name);
 305   f = Ufopen(big_buffer, "rb");
 306   if (f != NULL) break;
 307   if (n != 0 || subdir_set || errno != ENOENT) return spool_read_notopen;
 308   }
 309
 310 errno = 0;
 311
 312 #ifndef COMPILE_UTILITY
 313 DEBUG(D_deliver) debug_printf("reading spool file %s\n", name);
 314 #endif  /* COMPILE_UTILITY */
 315
 316 /* The first line of a spool file contains the message id followed by -H (i.e.
 317 the file name), in order to make the file self-identifying. */
 318
 319 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 320 if (Ustrlen(big_buffer) != MESSAGE_ID_LENGTH + 3 ||
 321     Ustrncmp(big_buffer, name, MESSAGE_ID_LENGTH + 2) != 0)
 322   goto SPOOL_FORMAT_ERROR;
 323
 324 /* The next three lines in the header file are in a fixed format. The first
 325 contains the login, uid, and gid of the user who caused the file to be written.
 326 There are known cases where a negative gid is used, so we allow for both
 327 negative uids and gids. The second contains the mail address of the message's
 328 sender, enclosed in <>. The third contains the time the message was received,
 329 and the number of warning messages for delivery delays that have been sent. */
 330
 331 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 332
 333 p = big_buffer + Ustrlen(big_buffer);
 334 while (p > big_buffer && isspace(p[-1])) p--;
 335 *p = 0;
 336 if (!isdigit(p[-1])) goto SPOOL_FORMAT_ERROR;
 337 while (p > big_buffer && (isdigit(p[-1]) || '-' == p[-1])) p--;
 338 gid = Uatoi(p);
 339 if (p <= big_buffer || *(--p) != ' ') goto SPOOL_FORMAT_ERROR;
 340 *p = 0;
 341 if (!isdigit(p[-1])) goto SPOOL_FORMAT_ERROR;
 342 while (p > big_buffer && (isdigit(p[-1]) || '-' == p[-1])) p--;
 343 uid = Uatoi(p);
 344 if (p <= big_buffer || *(--p) != ' ') goto SPOOL_FORMAT_ERROR;
 345 *p = 0;
 346
 347 originator_login = string_copy(big_buffer);
 348 originator_uid = (uid_t)uid;
 349 originator_gid = (gid_t)gid;
 350
 351 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 352 n = Ustrlen(big_buffer);
 353 if (n < 3 || big_buffer[0] != '<' || big_buffer[n-2] != '>')
 354   goto SPOOL_FORMAT_ERROR;
 355
 356 sender_address = store_get(n-2);
 357 Ustrncpy(sender_address, big_buffer+1, n-3);
 358 sender_address[n-3] = 0;
 359
 360 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 361 if (sscanf(CS big_buffer, "%d %d", &received_time, &warning_count) != 2)
 362   goto SPOOL_FORMAT_ERROR;
 363
 364 message_age = time(NULL) - received_time;
 365
 366 #ifndef COMPILE_UTILITY
 367 DEBUG(D_deliver) debug_printf("user=%s uid=%ld gid=%ld sender=%s\n",
 368   originator_login, (long int)originator_uid, (long int)originator_gid,
 369   sender_address);
 370 #endif  /* COMPILE_UTILITY */
 371
 372 /* Now there may be a number of optional lines, each starting with "-".
 373 If you add a new setting here, make sure you set the default above. */
 374
 375 for (;;)
 376   {
 377   if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 378   if (big_buffer[0] != '-') break;
 379
 380   big_buffer[Ustrlen(big_buffer) - 1] = 0;
 381   if (Ustrncmp(big_buffer, "-acl ", 5) == 0)
 382     {
 383     int index, count;
 384     if (sscanf(CS big_buffer + 5, "%d %d", &index, &count) != 2)
 385       goto SPOOL_FORMAT_ERROR;
 386     /* Ignore if index too big - might be if a later release with more
 387     variables built this spool file. */
 388     if (index < ACL_C_MAX + ACL_M_MAX)
 389       {
 390       acl_var[index] = store_get(count + 1);
 391       if (fread(acl_var[index], 1, count+1, f) < count) goto SPOOL_READ_ERROR;
 392       acl_var[index][count] = 0;
 393       }
 394     }
 395   else if (Ustrcmp(big_buffer, "-local") == 0) sender_local = TRUE;
 396   else if (Ustrcmp(big_buffer, "-localerror") == 0)
 397     local_error_message = TRUE;
 398   else if (Ustrncmp(big_buffer, "-local_scan ", 12) == 0)
 399     local_scan_data = string_copy(big_buffer + 12);
 400 #ifdef WITH_CONTENT_SCAN
 401   else if (Ustrncmp(big_buffer, "-spam_score_int ", 16) == 0)
 402     spam_score_int = string_copy(big_buffer + 16);
 403 #endif
 404 #ifdef EXPERIMENTAL_BRIGHTMAIL
 405   else if (Ustrncmp(big_buffer, "-bmi_verdicts ", 14) == 0)
 406     bmi_verdicts = string_copy(big_buffer + 14);
 407 #endif
 408   else if (Ustrcmp(big_buffer, "-host_lookup_deferred") == 0)
 409     host_lookup_deferred = TRUE;
 410   else if (Ustrcmp(big_buffer, "-host_lookup_failed") == 0)
 411     host_lookup_failed = TRUE;
 412   else if (Ustrncmp(big_buffer, "-body_linecount", 15) == 0)
 413     body_linecount = Uatoi(big_buffer + 15);
 414   else if (Ustrncmp(big_buffer, "-body_zerocount", 15) == 0)
 415     body_zerocount = Uatoi(big_buffer + 15);
 416   else if (Ustrncmp(big_buffer, "-frozen", 7) == 0)
 417     {
 418     deliver_freeze = TRUE;
 419     deliver_frozen_at = Uatoi(big_buffer + 7);
 420     }
 421   else if (Ustrcmp(big_buffer, "-allow_unqualified_recipient") == 0)
 422     allow_unqualified_recipient = TRUE;
 423   else if (Ustrcmp(big_buffer, "-allow_unqualified_sender") == 0)
 424     allow_unqualified_sender = TRUE;
 425   else if (Ustrcmp(big_buffer, "-deliver_firsttime") == 0)
 426     deliver_firsttime = TRUE;
 427   else if (Ustrcmp(big_buffer, "-manual_thaw") == 0)
 428     deliver_manual_thaw = TRUE;
 429   else if (Ustrncmp(big_buffer, "-auth_id", 8) == 0)
 430     authenticated_id = string_copy(big_buffer + 9);
 431   else if (Ustrncmp(big_buffer, "-auth_sender", 12) == 0)
 432     authenticated_sender = string_copy(big_buffer + 13);
 433   else if (Ustrncmp(big_buffer, "-sender_set_untrusted", 21) == 0)
 434     sender_set_untrusted = TRUE;
 435
 436   #ifdef SUPPORT_TLS
 437   else if (Ustrncmp(big_buffer, "-tls_certificate_verified", 25) == 0)
 438     tls_certificate_verified = TRUE;
 439   else if (Ustrncmp(big_buffer, "-tls_cipher", 11) == 0)
 440     tls_cipher = string_copy(big_buffer + 12);
 441   else if (Ustrncmp(big_buffer, "-tls_peerdn", 11) == 0)
 442     tls_peerdn = string_copy(big_buffer + 12);
 443   #endif
 444
 445   /* We now record the port number after the address, separated by a
 446   dot. For compatibility during upgrading, do nothing if there
 447   isn't a value (it gets left at zero). */
 448
 449   else if (Ustrncmp(big_buffer, "-host_address", 13) == 0)
 450     {
 451     sender_host_port = host_address_extract_port(big_buffer + 14);
 452     sender_host_address = string_copy(big_buffer + 14);
 453     }
 454
 455   else if (Ustrncmp(big_buffer, "-interface_address", 18) == 0)
 456     {
 457     interface_port = host_address_extract_port(big_buffer + 19);
 458     interface_address = string_copy(big_buffer + 19);
 459     }
 460
 461   else if (Ustrncmp(big_buffer, "-active_hostname", 16) == 0)
 462     smtp_active_hostname = string_copy(big_buffer + 17);
 463   else if (Ustrncmp(big_buffer, "-host_auth", 10) == 0)
 464     sender_host_authenticated = string_copy(big_buffer + 11);
 465   else if (Ustrncmp(big_buffer, "-host_name", 10) == 0)
 466     sender_host_name = string_copy(big_buffer + 11);
 467   else if (Ustrncmp(big_buffer, "-helo_name", 10) == 0)
 468     sender_helo_name = string_copy(big_buffer + 11);
 469   else if (Ustrncmp(big_buffer, "-ident", 6) == 0)
 470     sender_ident = string_copy(big_buffer + 7);
 471   else if (Ustrncmp(big_buffer, "-received_protocol", 18) == 0)
 472     received_protocol = string_copy(big_buffer + 19);
 473   else if (Ustrncmp(big_buffer, "-N", 2) == 0)
 474     dont_deliver = TRUE;
 475
 476   /* To allow new versions of Exim that add additional flags to interwork
 477   with older versions that do not understand them, just ignore any flagged
 478   lines that we don't recognize. Otherwise it wouldn't be possible to back
 479   off a new version that left new-style flags written on the spool. That's
 480   why the following line is commented out. */
 481
 482     /* else goto SPOOL_FORMAT_ERROR; */
 483   }
 484
 485 /* Build sender_fullhost if required */
 486
 487 #ifndef COMPILE_UTILITY
 488 host_build_sender_fullhost();
 489 #endif  /* COMPILE_UTILITY */
 490
 491 #ifndef COMPILE_UTILITY
 492 DEBUG(D_deliver)
 493   debug_printf("sender_local=%d ident=%s\n", sender_local,
 494     (sender_ident == NULL)? US"unset" : sender_ident);
 495 #endif  /* COMPILE_UTILITY */
 496
 497 /* We now have the tree of addresses NOT to deliver to, or a line
 498 containing "XX", indicating no tree. */
 499
 500 if (Ustrncmp(big_buffer, "XX\n", 3) != 0 &&
 501   !read_nonrecipients_tree(&tree_nonrecipients, f, big_buffer, big_buffer_size))
 502     goto SPOOL_FORMAT_ERROR;
 503
 504 #ifndef COMPILE_UTILITY
 505 DEBUG(D_deliver)
 506   {
 507   debug_printf("Non-recipients:\n");
 508   debug_print_tree(tree_nonrecipients);
 509   }
 510 #endif  /* COMPILE_UTILITY */
 511
 512 /* After reading the tree, the next line has not yet been read into the
 513 buffer. It contains the count of recipients which follow on separate lines. */
 514
 515 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 516 if (sscanf(CS big_buffer, "%d", &rcount) != 1) goto SPOOL_FORMAT_ERROR;
 517
 518 #ifndef COMPILE_UTILITY
 519 DEBUG(D_deliver) debug_printf("recipients_count=%d\n", rcount);
 520 #endif  /* COMPILE_UTILITY */
 521
 522 recipients_list_max = rcount;
 523 recipients_list = store_get(rcount * sizeof(recipient_item));
 524
 525 for (recipients_count = 0; recipients_count < rcount; recipients_count++)
 526   {
 527   int nn;
 528   int pno = -1;
 529   uschar *errors_to = NULL;
 530   uschar *p;
 531
 532   if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 533   nn = Ustrlen(big_buffer);
 534   if (nn < 2) goto SPOOL_FORMAT_ERROR;
 535
 536   /* Remove the newline; this terminates the address if there is no additional
 537   data on the line. */
 538
 539   p = big_buffer + nn - 1;
 540   *p-- = 0;
 541
 542   /* Look back from the end of the line for digits and special terminators.
 543   Since an address must end with a domain, we can tell that extra data is
 544   present by the presence of the terminator, which is always some character
 545   that cannot exist in a domain. (If I'd thought of the need for additional
 546   data early on, I'd have put it at the start, with the address at the end. As
 547   it is, we have to operate backwards. Addresses are permitted to contain
 548   spaces, you see.)
 549
 550   This code has to cope with various versions of this data that have evolved
 551   over time. In all cases, the line might just contain an address, with no
 552   additional data. Otherwise, the possibilities are as follows:
 553
 554   Exim 3 type:       <address><space><digits>,<digits>,<digits>
 555
 556     The second set of digits is the parent number for one_time addresses. The
 557     other values were remnants of earlier experiments that were abandoned.
 558
 559   Exim 4 first type: <address><space><digits>
 560
 561     The digits are the parent number for one_time addresses.
 562
 563   Exim 4 new type:   <address><space><data>#<type bits>
 564
 565     The type bits indicate what the contents of the data are.
 566
 567     Bit 01 indicates that, reading from right to left, the data
 568       ends with <errors_to address><space><len>,<pno> where pno is
 569       the parent number for one_time addresses, and len is the length
 570       of the errors_to address (zero meaning none).
 571    */
 572
 573   while (isdigit(*p)) p--;
 574
 575   /* Handle Exim 3 spool files */
 576
 577   if (*p == ',')
 578     {
 579     int dummy;
 580     while (isdigit(*(--p)) || *p == ',');
 581     if (*p == ' ')
 582       {
 583       *p++ = 0;
 584       (void)sscanf(CS p, "%d,%d", &dummy, &pno);
 585       }
 586     }
 587
 588   /* Handle early Exim 4 spool files */
 589
 590   else if (*p == ' ')
 591     {
 592     *p++ = 0;
 593     (void)sscanf(CS p, "%d", &pno);
 594     }
 595
 596   /* Handle current format Exim 4 spool files */
 597
 598   else if (*p == '#')
 599     {
 600     int flags;
 601     (void)sscanf(CS p+1, "%d", &flags);
 602
 603     if ((flags & 0x01) != 0)      /* one_time data exists */
 604       {
 605       int len;
 606       while (isdigit(*(--p)) || *p == ',' || *p == '-');
 607       (void)sscanf(CS p+1, "%d,%d", &len, &pno);
 608       *p = 0;
 609       if (len > 0)
 610         {
 611         p -= len;
 612         errors_to = string_copy(p);
 613         }
 614       }
 615
 616     *(--p) = 0;   /* Terminate address */
 617     }
 618
 619   recipients_list[recipients_count].address = string_copy(big_buffer);
 620   recipients_list[recipients_count].pno = pno;
 621   recipients_list[recipients_count].errors_to = errors_to;
 622   }
 623
 624 /* The remainder of the spool header file contains the headers for the message,
 625 separated off from the previous data by a blank line. Each header is preceded
 626 by a count of its length and either a certain letter (for various identified
 627 headers), space (for a miscellaneous live header) or an asterisk (for a header
 628 that has been rewritten). Count the Received: headers. We read the headers
 629 always, in order to check on the format of the file, but only create a header
 630 list if requested to do so. */
 631
 632 inheader = TRUE;
 633 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 634 if (big_buffer[0] != '\n') goto SPOOL_FORMAT_ERROR;
 635
 636 while ((n = fgetc(f)) != EOF)
 637   {
 638   header_line *h;
 639   uschar flag[4];
 640   int i;
 641
 642   if (!isdigit(n)) goto SPOOL_FORMAT_ERROR;
 643   (void)ungetc(n, f);
 644   (void)fscanf(f, "%d%c ", &n, flag);
 645   if (flag[0] != '*') message_size += n;  /* Omit non-transmitted headers */
 646
 647   if (read_headers)
 648     {
 649     h = store_get(sizeof(header_line));
 650     h->next = NULL;
 651     h->type = flag[0];
 652     h->slen = n;
 653     h->text = store_get(n+1);
 654
 655     if (h->type == htype_received) received_count++;
 656
 657     if (header_list == NULL) header_list = h;
 658       else header_last->next = h;
 659     header_last = h;
 660
 661     for (i = 0; i < n; i++)
 662       {
 663       int c = fgetc(f);
 664       if (c == 0 || c == EOF) goto SPOOL_FORMAT_ERROR;
 665       if (c == '\n' && h->type != htype_old) message_linecount++;
 666       h->text[i] = c;
 667       }
 668     h->text[i] = 0;
 669     }
 670
 671   /* Not requiring header data, just skip through the bytes */
 672
 673   else for (i = 0; i < n; i++)
 674     {
 675     int c = fgetc(f);
 676     if (c == 0 || c == EOF) goto SPOOL_FORMAT_ERROR;
 677     }
 678   }
 679
 680 /* We have successfully read the data in the header file. Update the message
 681 line count by adding the body linecount to the header linecount. Close the file
 682 and give a positive response. */
 683
 684 #ifndef COMPILE_UTILITY
 685 DEBUG(D_deliver) debug_printf("body_linecount=%d message_linecount=%d\n",
 686   body_linecount, message_linecount);
 687 #endif  /* COMPILE_UTILITY */
 688
 689 message_linecount += body_linecount;
 690
 691 fclose(f);
 692 return spool_read_OK;
 693
 694
 695 /* There was an error reading the spool or there was missing data,
 696 or there was a format error. A "read error" with no errno means an
 697 unexpected EOF, which we treat as a format error. */
 698
 699 SPOOL_READ_ERROR:
 700 if (errno != 0)
 701   {
 702   n = errno;
 703
 704   #ifndef COMPILE_UTILITY
 705   DEBUG(D_any) debug_printf("Error while reading spool file %s\n", name);
 706   #endif  /* COMPILE_UTILITY */
 707
 708   fclose(f);
 709   errno = n;
 710   return inheader? spool_read_hdrerror : spool_read_enverror;
 711   }
 712
 713 SPOOL_FORMAT_ERROR:
 714
 715 #ifndef COMPILE_UTILITY
 716 DEBUG(D_any) debug_printf("Format error in spool file %s\n", name);
 717 #endif  /* COMPILE_UTILITY */
 718
 719 fclose(f);
 720 errno = ERRNO_SPOOLFORMAT;
 721 return inheader? spool_read_hdrerror : spool_read_enverror;
 722 }
 723
 724 /* End of spool_in.c */