src/src/spool_in.c

   1 /* $Cambridge: exim/src/src/spool_in.c,v 1.15 2006/02/07 11:19:00 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 for (n = 0; n < ACL_CVARS + ACL_MVARS; 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   big_buffer[Ustrlen(big_buffer) - 1] = 0;
 380
 381   /* For backward compatibility, we recognize "-acl", which was used before the
 382   number of ACL variables changed. Its variable number is 0-9 for connection
 383   variables, and 10-19 for message variables. */
 384
 385   if (Ustrncmp(big_buffer, "-acl ", 5) == 0)
 386     {
 387     int index, count;
 388     if (sscanf(CS big_buffer + 5, "%d %d", &index, &count) != 2)
 389       goto SPOOL_FORMAT_ERROR;
 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   /* Nowadays we use "-aclc" and "-aclm" for the different types of ACL
 396   variable, because Exim may be built with different numbers of them. */
 397
 398   else if (Ustrncmp(big_buffer, "-aclc ", 6) == 0)
 399     {
 400     int index, count;
 401     if (sscanf(CS big_buffer + 6, "%d %d", &index, &count) != 2)
 402       goto SPOOL_FORMAT_ERROR;
 403     if (index < ACL_CVARS)
 404       {
 405       acl_var[index] = store_get(count + 1);
 406       if (fread(acl_var[index], 1, count+1, f) < count) goto SPOOL_READ_ERROR;
 407       acl_var[index][count] = 0;
 408       }
 409     }
 410
 411   else if (Ustrncmp(big_buffer, "-aclm ", 6) == 0)
 412     {
 413     int index, count;
 414     if (sscanf(CS big_buffer + 6, "%d %d", &index, &count) != 2)
 415       goto SPOOL_FORMAT_ERROR;
 416     if (index < ACL_MVARS)
 417       {
 418       index += ACL_CVARS;
 419       acl_var[index] = store_get(count + 1);
 420       if (fread(acl_var[index], 1, count+1, f) < count) goto SPOOL_READ_ERROR;
 421       acl_var[index][count] = 0;
 422       }
 423     }
 424
 425   /* Other values */
 426
 427   else if (Ustrcmp(big_buffer, "-local") == 0) sender_local = TRUE;
 428   else if (Ustrcmp(big_buffer, "-localerror") == 0)
 429     local_error_message = TRUE;
 430   else if (Ustrncmp(big_buffer, "-local_scan ", 12) == 0)
 431     local_scan_data = string_copy(big_buffer + 12);
 432 #ifdef WITH_CONTENT_SCAN
 433   else if (Ustrncmp(big_buffer, "-spam_score_int ", 16) == 0)
 434     spam_score_int = string_copy(big_buffer + 16);
 435 #endif
 436 #ifdef EXPERIMENTAL_BRIGHTMAIL
 437   else if (Ustrncmp(big_buffer, "-bmi_verdicts ", 14) == 0)
 438     bmi_verdicts = string_copy(big_buffer + 14);
 439 #endif
 440   else if (Ustrcmp(big_buffer, "-host_lookup_deferred") == 0)
 441     host_lookup_deferred = TRUE;
 442   else if (Ustrcmp(big_buffer, "-host_lookup_failed") == 0)
 443     host_lookup_failed = TRUE;
 444   else if (Ustrncmp(big_buffer, "-body_linecount", 15) == 0)
 445     body_linecount = Uatoi(big_buffer + 15);
 446   else if (Ustrncmp(big_buffer, "-body_zerocount", 15) == 0)
 447     body_zerocount = Uatoi(big_buffer + 15);
 448   else if (Ustrncmp(big_buffer, "-frozen", 7) == 0)
 449     {
 450     deliver_freeze = TRUE;
 451     deliver_frozen_at = Uatoi(big_buffer + 7);
 452     }
 453   else if (Ustrcmp(big_buffer, "-allow_unqualified_recipient") == 0)
 454     allow_unqualified_recipient = TRUE;
 455   else if (Ustrcmp(big_buffer, "-allow_unqualified_sender") == 0)
 456     allow_unqualified_sender = TRUE;
 457   else if (Ustrcmp(big_buffer, "-deliver_firsttime") == 0)
 458     deliver_firsttime = TRUE;
 459   else if (Ustrcmp(big_buffer, "-manual_thaw") == 0)
 460     deliver_manual_thaw = TRUE;
 461   else if (Ustrncmp(big_buffer, "-auth_id", 8) == 0)
 462     authenticated_id = string_copy(big_buffer + 9);
 463   else if (Ustrncmp(big_buffer, "-auth_sender", 12) == 0)
 464     authenticated_sender = string_copy(big_buffer + 13);
 465   else if (Ustrncmp(big_buffer, "-sender_set_untrusted", 21) == 0)
 466     sender_set_untrusted = TRUE;
 467
 468   #ifdef SUPPORT_TLS
 469   else if (Ustrncmp(big_buffer, "-tls_certificate_verified", 25) == 0)
 470     tls_certificate_verified = TRUE;
 471   else if (Ustrncmp(big_buffer, "-tls_cipher", 11) == 0)
 472     tls_cipher = string_copy(big_buffer + 12);
 473   else if (Ustrncmp(big_buffer, "-tls_peerdn", 11) == 0)
 474     tls_peerdn = string_copy(big_buffer + 12);
 475   #endif
 476
 477   /* We now record the port number after the address, separated by a
 478   dot. For compatibility during upgrading, do nothing if there
 479   isn't a value (it gets left at zero). */
 480
 481   else if (Ustrncmp(big_buffer, "-host_address", 13) == 0)
 482     {
 483     sender_host_port = host_address_extract_port(big_buffer + 14);
 484     sender_host_address = string_copy(big_buffer + 14);
 485     }
 486
 487   else if (Ustrncmp(big_buffer, "-interface_address", 18) == 0)
 488     {
 489     interface_port = host_address_extract_port(big_buffer + 19);
 490     interface_address = string_copy(big_buffer + 19);
 491     }
 492
 493   else if (Ustrncmp(big_buffer, "-active_hostname", 16) == 0)
 494     smtp_active_hostname = string_copy(big_buffer + 17);
 495   else if (Ustrncmp(big_buffer, "-host_auth", 10) == 0)
 496     sender_host_authenticated = string_copy(big_buffer + 11);
 497   else if (Ustrncmp(big_buffer, "-host_name", 10) == 0)
 498     sender_host_name = string_copy(big_buffer + 11);
 499   else if (Ustrncmp(big_buffer, "-helo_name", 10) == 0)
 500     sender_helo_name = string_copy(big_buffer + 11);
 501   else if (Ustrncmp(big_buffer, "-ident", 6) == 0)
 502     sender_ident = string_copy(big_buffer + 7);
 503   else if (Ustrncmp(big_buffer, "-received_protocol", 18) == 0)
 504     received_protocol = string_copy(big_buffer + 19);
 505   else if (Ustrncmp(big_buffer, "-N", 2) == 0)
 506     dont_deliver = TRUE;
 507
 508   /* To allow new versions of Exim that add additional flags to interwork
 509   with older versions that do not understand them, just ignore any flagged
 510   lines that we don't recognize. Otherwise it wouldn't be possible to back
 511   off a new version that left new-style flags written on the spool. That's
 512   why the following line is commented out. */
 513
 514     /* else goto SPOOL_FORMAT_ERROR; */
 515   }
 516
 517 /* Build sender_fullhost if required */
 518
 519 #ifndef COMPILE_UTILITY
 520 host_build_sender_fullhost();
 521 #endif  /* COMPILE_UTILITY */
 522
 523 #ifndef COMPILE_UTILITY
 524 DEBUG(D_deliver)
 525   debug_printf("sender_local=%d ident=%s\n", sender_local,
 526     (sender_ident == NULL)? US"unset" : sender_ident);
 527 #endif  /* COMPILE_UTILITY */
 528
 529 /* We now have the tree of addresses NOT to deliver to, or a line
 530 containing "XX", indicating no tree. */
 531
 532 if (Ustrncmp(big_buffer, "XX\n", 3) != 0 &&
 533   !read_nonrecipients_tree(&tree_nonrecipients, f, big_buffer, big_buffer_size))
 534     goto SPOOL_FORMAT_ERROR;
 535
 536 #ifndef COMPILE_UTILITY
 537 DEBUG(D_deliver)
 538   {
 539   debug_printf("Non-recipients:\n");
 540   debug_print_tree(tree_nonrecipients);
 541   }
 542 #endif  /* COMPILE_UTILITY */
 543
 544 /* After reading the tree, the next line has not yet been read into the
 545 buffer. It contains the count of recipients which follow on separate lines. */
 546
 547 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 548 if (sscanf(CS big_buffer, "%d", &rcount) != 1) goto SPOOL_FORMAT_ERROR;
 549
 550 #ifndef COMPILE_UTILITY
 551 DEBUG(D_deliver) debug_printf("recipients_count=%d\n", rcount);
 552 #endif  /* COMPILE_UTILITY */
 553
 554 recipients_list_max = rcount;
 555 recipients_list = store_get(rcount * sizeof(recipient_item));
 556
 557 for (recipients_count = 0; recipients_count < rcount; recipients_count++)
 558   {
 559   int nn;
 560   int pno = -1;
 561   uschar *errors_to = NULL;
 562   uschar *p;
 563
 564   if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 565   nn = Ustrlen(big_buffer);
 566   if (nn < 2) goto SPOOL_FORMAT_ERROR;
 567
 568   /* Remove the newline; this terminates the address if there is no additional
 569   data on the line. */
 570
 571   p = big_buffer + nn - 1;
 572   *p-- = 0;
 573
 574   /* Look back from the end of the line for digits and special terminators.
 575   Since an address must end with a domain, we can tell that extra data is
 576   present by the presence of the terminator, which is always some character
 577   that cannot exist in a domain. (If I'd thought of the need for additional
 578   data early on, I'd have put it at the start, with the address at the end. As
 579   it is, we have to operate backwards. Addresses are permitted to contain
 580   spaces, you see.)
 581
 582   This code has to cope with various versions of this data that have evolved
 583   over time. In all cases, the line might just contain an address, with no
 584   additional data. Otherwise, the possibilities are as follows:
 585
 586   Exim 3 type:       <address><space><digits>,<digits>,<digits>
 587
 588     The second set of digits is the parent number for one_time addresses. The
 589     other values were remnants of earlier experiments that were abandoned.
 590
 591   Exim 4 first type: <address><space><digits>
 592
 593     The digits are the parent number for one_time addresses.
 594
 595   Exim 4 new type:   <address><space><data>#<type bits>
 596
 597     The type bits indicate what the contents of the data are.
 598
 599     Bit 01 indicates that, reading from right to left, the data
 600       ends with <errors_to address><space><len>,<pno> where pno is
 601       the parent number for one_time addresses, and len is the length
 602       of the errors_to address (zero meaning none).
 603    */
 604
 605   while (isdigit(*p)) p--;
 606
 607   /* Handle Exim 3 spool files */
 608
 609   if (*p == ',')
 610     {
 611     int dummy;
 612     while (isdigit(*(--p)) || *p == ',');
 613     if (*p == ' ')
 614       {
 615       *p++ = 0;
 616       (void)sscanf(CS p, "%d,%d", &dummy, &pno);
 617       }
 618     }
 619
 620   /* Handle early Exim 4 spool files */
 621
 622   else if (*p == ' ')
 623     {
 624     *p++ = 0;
 625     (void)sscanf(CS p, "%d", &pno);
 626     }
 627
 628   /* Handle current format Exim 4 spool files */
 629
 630   else if (*p == '#')
 631     {
 632     int flags;
 633     (void)sscanf(CS p+1, "%d", &flags);
 634
 635     if ((flags & 0x01) != 0)      /* one_time data exists */
 636       {
 637       int len;
 638       while (isdigit(*(--p)) || *p == ',' || *p == '-');
 639       (void)sscanf(CS p+1, "%d,%d", &len, &pno);
 640       *p = 0;
 641       if (len > 0)
 642         {
 643         p -= len;
 644         errors_to = string_copy(p);
 645         }
 646       }
 647
 648     *(--p) = 0;   /* Terminate address */
 649     }
 650
 651   recipients_list[recipients_count].address = string_copy(big_buffer);
 652   recipients_list[recipients_count].pno = pno;
 653   recipients_list[recipients_count].errors_to = errors_to;
 654   }
 655
 656 /* The remainder of the spool header file contains the headers for the message,
 657 separated off from the previous data by a blank line. Each header is preceded
 658 by a count of its length and either a certain letter (for various identified
 659 headers), space (for a miscellaneous live header) or an asterisk (for a header
 660 that has been rewritten). Count the Received: headers. We read the headers
 661 always, in order to check on the format of the file, but only create a header
 662 list if requested to do so. */
 663
 664 inheader = TRUE;
 665 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 666 if (big_buffer[0] != '\n') goto SPOOL_FORMAT_ERROR;
 667
 668 while ((n = fgetc(f)) != EOF)
 669   {
 670   header_line *h;
 671   uschar flag[4];
 672   int i;
 673
 674   if (!isdigit(n)) goto SPOOL_FORMAT_ERROR;
 675   (void)ungetc(n, f);
 676   (void)fscanf(f, "%d%c ", &n, flag);
 677   if (flag[0] != '*') message_size += n;  /* Omit non-transmitted headers */
 678
 679   if (read_headers)
 680     {
 681     h = store_get(sizeof(header_line));
 682     h->next = NULL;
 683     h->type = flag[0];
 684     h->slen = n;
 685     h->text = store_get(n+1);
 686
 687     if (h->type == htype_received) received_count++;
 688
 689     if (header_list == NULL) header_list = h;
 690       else header_last->next = h;
 691     header_last = h;
 692
 693     for (i = 0; i < n; i++)
 694       {
 695       int c = fgetc(f);
 696       if (c == 0 || c == EOF) goto SPOOL_FORMAT_ERROR;
 697       if (c == '\n' && h->type != htype_old) message_linecount++;
 698       h->text[i] = c;
 699       }
 700     h->text[i] = 0;
 701     }
 702
 703   /* Not requiring header data, just skip through the bytes */
 704
 705   else for (i = 0; i < n; i++)
 706     {
 707     int c = fgetc(f);
 708     if (c == 0 || c == EOF) goto SPOOL_FORMAT_ERROR;
 709     }
 710   }
 711
 712 /* We have successfully read the data in the header file. Update the message
 713 line count by adding the body linecount to the header linecount. Close the file
 714 and give a positive response. */
 715
 716 #ifndef COMPILE_UTILITY
 717 DEBUG(D_deliver) debug_printf("body_linecount=%d message_linecount=%d\n",
 718   body_linecount, message_linecount);
 719 #endif  /* COMPILE_UTILITY */
 720
 721 message_linecount += body_linecount;
 722
 723 fclose(f);
 724 return spool_read_OK;
 725
 726
 727 /* There was an error reading the spool or there was missing data,
 728 or there was a format error. A "read error" with no errno means an
 729 unexpected EOF, which we treat as a format error. */
 730
 731 SPOOL_READ_ERROR:
 732 if (errno != 0)
 733   {
 734   n = errno;
 735
 736   #ifndef COMPILE_UTILITY
 737   DEBUG(D_any) debug_printf("Error while reading spool file %s\n", name);
 738   #endif  /* COMPILE_UTILITY */
 739
 740   fclose(f);
 741   errno = n;
 742   return inheader? spool_read_hdrerror : spool_read_enverror;
 743   }
 744
 745 SPOOL_FORMAT_ERROR:
 746
 747 #ifndef COMPILE_UTILITY
 748 DEBUG(D_any) debug_printf("Format error in spool file %s\n", name);
 749 #endif  /* COMPILE_UTILITY */
 750
 751 fclose(f);
 752 errno = ERRNO_SPOOLFORMAT;
 753 return inheader? spool_read_hdrerror : spool_read_enverror;
 754 }
 755
 756 /* End of spool_in.c */