src/src/spool_in.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2009 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8 /* Functions for reading spool files. When compiling for a utility (eximon),
   9 not all are needed, and some functionality can be cut out. */
  10
  11
  12 #include "exim.h"
  13
  14
  15
  16 #ifndef COMPILE_UTILITY
  17 /*************************************************
  18 *           Open and lock data file              *
  19 *************************************************/
  20
  21 /* The data file is the one that is used for locking, because the header file
  22 can get replaced during delivery because of header rewriting. The file has
  23 to opened with write access so that we can get an exclusive lock, but in
  24 fact it won't be written to. Just in case there's a major disaster (e.g.
  25 overwriting some other file descriptor with the value of this one), open it
  26 with append.
  27
  28 Argument: the id of the message
  29 Returns:  TRUE if file successfully opened and locked
  30
  31 Side effect: deliver_datafile is set to the fd of the open file.
  32 */
  33
  34 BOOL
  35 spool_open_datafile(uschar *id)
  36 {
  37 int i;
  38 struct stat statbuf;
  39 flock_t lock_data;
  40 uschar spoolname[256];
  41
  42 /* If split_spool_directory is set, first look for the file in the appropriate
  43 sub-directory of the input directory. If it is not found there, try the input
  44 directory itself, to pick up leftovers from before the splitting. If split_
  45 spool_directory is not set, first look in the main input directory. If it is
  46 not found there, try the split sub-directory, in case it is left over from a
  47 splitting state. */
  48
  49 for (i = 0; i < 2; i++)
  50   {
  51   int save_errno;
  52   message_subdir[0] = (split_spool_directory == (i == 0))? id[5] : 0;
  53   sprintf(CS spoolname, "%s/input/%s/%s-D", spool_directory, message_subdir, id);
  54   deliver_datafile = Uopen(spoolname, O_RDWR | O_APPEND, 0);
  55   if (deliver_datafile >= 0) break;
  56   save_errno = errno;
  57   if (errno == ENOENT)
  58     {
  59     if (i == 0) continue;
  60     if (!queue_running)
  61       log_write(0, LOG_MAIN, "Spool file %s-D not found", id);
  62     }
  63   else log_write(0, LOG_MAIN, "Spool error for %s: %s", spoolname,
  64     strerror(errno));
  65   errno = save_errno;
  66   return FALSE;
  67   }
  68
  69 /* File is open and message_subdir is set. Set the close-on-exec flag, and lock
  70 the file. We lock only the first line of the file (containing the message ID)
  71 because this apparently is needed for running Exim under Cygwin. If the entire
  72 file is locked in one process, a sub-process cannot access it, even when passed
  73 an open file descriptor (at least, I think that's the Cygwin story). On real
  74 Unix systems it doesn't make any difference as long as Exim is consistent in
  75 what it locks. */
  76
  77 (void)fcntl(deliver_datafile, F_SETFD, fcntl(deliver_datafile, F_GETFD) |
  78   FD_CLOEXEC);
  79
  80 lock_data.l_type = F_WRLCK;
  81 lock_data.l_whence = SEEK_SET;
  82 lock_data.l_start = 0;
  83 lock_data.l_len = SPOOL_DATA_START_OFFSET;
  84
  85 if (fcntl(deliver_datafile, F_SETLK, &lock_data) < 0)
  86   {
  87   log_write(L_skip_delivery,
  88             LOG_MAIN,
  89             "Spool file is locked (another process is handling this message)");
  90   (void)close(deliver_datafile);
  91   deliver_datafile = -1;
  92   errno = 0;
  93   return FALSE;
  94   }
  95
  96 /* Get the size of the data; don't include the leading filename line
  97 in the count, but add one for the newline before the data. */
  98
  99 if (fstat(deliver_datafile, &statbuf) == 0)
 100   {
 101   message_body_size = statbuf.st_size - SPOOL_DATA_START_OFFSET;
 102   message_size = message_body_size + 1;
 103   }
 104
 105 return TRUE;
 106 }
 107 #endif  /* COMPILE_UTILITY */
 108
 109
 110
 111 /*************************************************
 112 *    Read non-recipients tree from spool file    *
 113 *************************************************/
 114
 115 /* The tree of non-recipients is written to the spool file in a form that
 116 makes it easy to read back into a tree. The format is as follows:
 117
 118    . Each node is preceded by two letter(Y/N) indicating whether it has left
 119      or right children. There's one space after the two flags, before the name.
 120
 121    . The left subtree (if any) then follows, then the right subtree (if any).
 122
 123 This function is entered with the next input line in the buffer. Note we must
 124 save the right flag before recursing with the same buffer.
 125
 126 Once the tree is read, we re-construct the balance fields by scanning the tree.
 127 I forgot to write them out originally, and the compatible fix is to do it this
 128 way. This initial local recursing function does the necessary.
 129
 130 Arguments:
 131   node      tree node
 132
 133 Returns:    maximum depth below the node, including the node itself
 134 */
 135
 136 static int
 137 count_below(tree_node *node)
 138 {
 139 int nleft, nright;
 140 if (node == NULL) return 0;
 141 nleft = count_below(node->left);
 142 nright = count_below(node->right);
 143 node->balance = (nleft > nright)? 1 : ((nright > nleft)? 2 : 0);
 144 return 1 + ((nleft > nright)? nleft : nright);
 145 }
 146
 147 /* This is the real function...
 148
 149 Arguments:
 150   connect      pointer to the root of the tree
 151   f            FILE to read data from
 152   buffer       contains next input line; further lines read into it
 153   buffer_size  size of the buffer
 154
 155 Returns:       FALSE on format error
 156 */
 157
 158 static BOOL
 159 read_nonrecipients_tree(tree_node **connect, FILE *f, uschar *buffer,
 160   int buffer_size)
 161 {
 162 tree_node *node;
 163 int n = Ustrlen(buffer);
 164 BOOL right = buffer[1] == 'Y';
 165
 166 if (n < 5) return FALSE;    /* malformed line */
 167 buffer[n-1] = 0;            /* Remove \n */
 168 node = store_get(sizeof(tree_node) + n - 3);
 169 *connect = node;
 170 Ustrcpy(node->name, buffer + 3);
 171 node->data.ptr = NULL;
 172
 173 if (buffer[0] == 'Y')
 174   {
 175   if (Ufgets(buffer, buffer_size, f) == NULL ||
 176     !read_nonrecipients_tree(&node->left, f, buffer, buffer_size))
 177       return FALSE;
 178   }
 179 else node->left = NULL;
 180
 181 if (right)
 182   {
 183   if (Ufgets(buffer, buffer_size, f) == NULL ||
 184     !read_nonrecipients_tree(&node->right, f, buffer, buffer_size))
 185       return FALSE;
 186   }
 187 else node->right = NULL;
 188
 189 (void) count_below(*connect);
 190 return TRUE;
 191 }
 192
 193
 194
 195
 196 /*************************************************
 197 *             Read spool header file             *
 198 *************************************************/
 199
 200 /* This function reads a spool header file and places the data into the
 201 appropriate global variables. The header portion is always read, but header
 202 structures are built only if read_headers is set true. It isn't, for example,
 203 while generating -bp output.
 204
 205 It may be possible for blocks of nulls (binary zeroes) to get written on the
 206 end of a file if there is a system crash during writing. It was observed on an
 207 earlier version of Exim that omitted to fsync() the files - this is thought to
 208 have been the cause of that incident, but in any case, this code must be robust
 209 against such an event, and if such a file is encountered, it must be treated as
 210 malformed.
 211
 212 Arguments:
 213   name          name of the header file, including the -H
 214   read_headers  TRUE if in-store header structures are to be built
 215   subdir_set    TRUE is message_subdir is already set
 216
 217 Returns:        spool_read_OK        success
 218                 spool_read_notopen   open failed
 219                 spool_read_enverror  error in the envelope portion
 220                 spool_read_hdrdrror  error in the header portion
 221 */
 222
 223 int
 224 spool_read_header(uschar *name, BOOL read_headers, BOOL subdir_set)
 225 {
 226 FILE *f = NULL;
 227 int n;
 228 int rcount = 0;
 229 long int uid, gid;
 230 BOOL inheader = FALSE;
 231 uschar *p;
 232
 233 /* Reset all the global variables to their default values. However, there is
 234 one exception. DO NOT change the default value of dont_deliver, because it may
 235 be forced by an external setting. */
 236
 237 acl_var_c = acl_var_m = NULL;
 238 authenticated_id = NULL;
 239 authenticated_sender = NULL;
 240 allow_unqualified_recipient = FALSE;
 241 allow_unqualified_sender = FALSE;
 242 body_linecount = 0;
 243 body_zerocount = 0;
 244 deliver_firsttime = FALSE;
 245 deliver_freeze = FALSE;
 246 deliver_frozen_at = 0;
 247 deliver_manual_thaw = FALSE;
 248 /* dont_deliver must NOT be reset */
 249 header_list = header_last = NULL;
 250 host_lookup_deferred = FALSE;
 251 host_lookup_failed = FALSE;
 252 interface_address = NULL;
 253 interface_port = 0;
 254 local_error_message = FALSE;
 255 local_scan_data = NULL;
 256 max_received_linelength = 0;
 257 message_linecount = 0;
 258 received_protocol = NULL;
 259 received_count = 0;
 260 recipients_list = NULL;
 261 sender_address = NULL;
 262 sender_fullhost = NULL;
 263 sender_helo_name = NULL;
 264 sender_host_address = NULL;
 265 sender_host_name = NULL;
 266 sender_host_port = 0;
 267 sender_host_authenticated = NULL;
 268 sender_ident = NULL;
 269 sender_local = FALSE;
 270 sender_set_untrusted = FALSE;
 271 smtp_active_hostname = primary_hostname;
 272 tree_nonrecipients = NULL;
 273
 274 #ifdef EXPERIMENTAL_BRIGHTMAIL
 275 bmi_run = 0;
 276 bmi_verdicts = NULL;
 277 #endif
 278
 279 #ifndef DISABLE_DKIM
 280 dkim_signers = NULL;
 281 dkim_disable_verify = FALSE;
 282 dkim_collect_input = FALSE;
 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 "-". If you
 373 add a new setting here, make sure you set the default above.
 374
 375 Because there are now quite a number of different possibilities, we use a
 376 switch on the first character to avoid too many failing tests. Thanks to Nico
 377 Erfurth for the patch that implemented this. I have made it even more efficient
 378 by not re-scanning the first two characters.
 379
 380 To allow new versions of Exim that add additional flags to interwork with older
 381 versions that do not understand them, just ignore any lines starting with "-"
 382 that we don't recognize. Otherwise it wouldn't be possible to back off a new
 383 version that left new-style flags written on the spool. */
 384
 385 p = big_buffer + 2;
 386 for (;;)
 387   {
 388   if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 389   if (big_buffer[0] != '-') break;
 390   big_buffer[Ustrlen(big_buffer) - 1] = 0;
 391
 392   switch(big_buffer[1])
 393     {
 394     case 'a':
 395
 396     /* Nowadays we use "-aclc" and "-aclm" for the different types of ACL
 397     variable, because Exim allows any number of them, with arbitrary names.
 398     The line in the spool file is "-acl[cm] <name> <length>". The name excludes
 399     the c or m. */
 400
 401     if (Ustrncmp(p, "clc ", 4) == 0 ||
 402         Ustrncmp(p, "clm ", 4) == 0)
 403       {
 404       uschar *name, *endptr;
 405       int count;
 406       tree_node *node;
 407       endptr = Ustrchr(big_buffer + 6, ' ');
 408       if (endptr == NULL) goto SPOOL_FORMAT_ERROR;
 409       name = string_sprintf("%c%.*s", big_buffer[4], endptr - big_buffer - 6,
 410         big_buffer + 6);
 411       if (sscanf(CS endptr, " %d", &count) != 1) goto SPOOL_FORMAT_ERROR;
 412       node = acl_var_create(name);
 413       node->data.ptr = store_get(count + 1);
 414       if (fread(node->data.ptr, 1, count+1, f) < count) goto SPOOL_READ_ERROR;
 415       ((uschar*)node->data.ptr)[count] = 0;
 416       }
 417
 418     else if (Ustrcmp(p, "llow_unqualified_recipient") == 0)
 419       allow_unqualified_recipient = TRUE;
 420     else if (Ustrcmp(p, "llow_unqualified_sender") == 0)
 421       allow_unqualified_sender = TRUE;
 422
 423     else if (Ustrncmp(p, "uth_id", 6) == 0)
 424       authenticated_id = string_copy(big_buffer + 9);
 425     else if (Ustrncmp(p, "uth_sender", 10) == 0)
 426       authenticated_sender = string_copy(big_buffer + 13);
 427     else if (Ustrncmp(p, "ctive_hostname", 14) == 0)
 428       smtp_active_hostname = string_copy(big_buffer + 17);
 429
 430     /* For long-term backward compatibility, we recognize "-acl", which was
 431     used before the number of ACL variables changed from 10 to 20. This was
 432     before the subsequent change to an arbitrary number of named variables.
 433     This code is retained so that upgrades from very old versions can still
 434     handle old-format spool files. The value given after "-acl" is a number
 435     that is 0-9 for connection variables, and 10-19 for message variables. */
 436
 437     else if (Ustrncmp(p, "cl ", 3) == 0)
 438       {
 439       int index, count;
 440       uschar name[20];   /* Need plenty of space for %d format */
 441       tree_node *node;
 442       if (sscanf(CS big_buffer + 5, "%d %d", &index, &count) != 2)
 443         goto SPOOL_FORMAT_ERROR;
 444       if (index < 10)
 445         (void) string_format(name, sizeof(name), "%c%d", 'c', index);
 446       else if (index < 20) /* ignore out-of-range index */
 447         (void) string_format(name, sizeof(name), "%c%d", 'm', index - 10);
 448       node = acl_var_create(name);
 449       node->data.ptr = store_get(count + 1);
 450       if (fread(node->data.ptr, 1, count+1, f) < count) goto SPOOL_READ_ERROR;
 451       ((uschar*)node->data.ptr)[count] = 0;
 452       }
 453     break;
 454
 455     case 'b':
 456     if (Ustrncmp(p, "ody_linecount", 13) == 0)
 457       body_linecount = Uatoi(big_buffer + 15);
 458     else if (Ustrncmp(p, "ody_zerocount", 13) == 0)
 459       body_zerocount = Uatoi(big_buffer + 15);
 460     #ifdef EXPERIMENTAL_BRIGHTMAIL
 461     else if (Ustrncmp(p, "mi_verdicts ", 12) == 0)
 462       bmi_verdicts = string_copy(big_buffer + 14);
 463     #endif
 464     break;
 465
 466     case 'd':
 467     if (Ustrcmp(p, "eliver_firsttime") == 0)
 468       deliver_firsttime = TRUE;
 469     break;
 470
 471     case 'f':
 472     if (Ustrncmp(p, "rozen", 5) == 0)
 473       {
 474       deliver_freeze = TRUE;
 475       deliver_frozen_at = Uatoi(big_buffer + 7);
 476       }
 477     break;
 478
 479     case 'h':
 480     if (Ustrcmp(p, "ost_lookup_deferred") == 0)
 481       host_lookup_deferred = TRUE;
 482     else if (Ustrcmp(p, "ost_lookup_failed") == 0)
 483       host_lookup_failed = TRUE;
 484     else if (Ustrncmp(p, "ost_auth", 8) == 0)
 485       sender_host_authenticated = string_copy(big_buffer + 11);
 486     else if (Ustrncmp(p, "ost_name", 8) == 0)
 487       sender_host_name = string_copy(big_buffer + 11);
 488     else if (Ustrncmp(p, "elo_name", 8) == 0)
 489       sender_helo_name = string_copy(big_buffer + 11);
 490
 491     /* We now record the port number after the address, separated by a
 492     dot. For compatibility during upgrading, do nothing if there
 493     isn't a value (it gets left at zero). */
 494
 495     else if (Ustrncmp(p, "ost_address", 11) == 0)
 496       {
 497       sender_host_port = host_address_extract_port(big_buffer + 14);
 498       sender_host_address = string_copy(big_buffer + 14);
 499       }
 500     break;
 501
 502     case 'i':
 503     if (Ustrncmp(p, "nterface_address", 16) == 0)
 504       {
 505       interface_port = host_address_extract_port(big_buffer + 19);
 506       interface_address = string_copy(big_buffer + 19);
 507       }
 508     else if (Ustrncmp(p, "dent", 4) == 0)
 509       sender_ident = string_copy(big_buffer + 7);
 510     break;
 511
 512     case 'l':
 513     if (Ustrcmp(p, "ocal") == 0) sender_local = TRUE;
 514     else if (Ustrcmp(big_buffer, "-localerror") == 0)
 515       local_error_message = TRUE;
 516     else if (Ustrncmp(p, "ocal_scan ", 10) == 0)
 517       local_scan_data = string_copy(big_buffer + 12);
 518     break;
 519
 520     case 'm':
 521     if (Ustrcmp(p, "anual_thaw") == 0) deliver_manual_thaw = TRUE;
 522     else if (Ustrncmp(p, "ax_received_linelength", 22) == 0)
 523       max_received_linelength = Uatoi(big_buffer + 24);
 524     break;
 525
 526     case 'N':
 527     if (*p == 0) dont_deliver = TRUE;   /* -N */
 528     break;
 529
 530     case 'r':
 531     if (Ustrncmp(p, "eceived_protocol", 16) == 0)
 532       received_protocol = string_copy(big_buffer + 19);
 533     break;
 534
 535     case 's':
 536     if (Ustrncmp(p, "ender_set_untrusted", 19) == 0)
 537       sender_set_untrusted = TRUE;
 538     #ifdef WITH_CONTENT_SCAN
 539     else if (Ustrncmp(p, "pam_score_int ", 14) == 0)
 540       spam_score_int = string_copy(big_buffer + 16);
 541     #endif
 542     break;
 543
 544     #ifdef SUPPORT_TLS
 545     case 't':
 546     if (Ustrncmp(p, "ls_certificate_verified", 23) == 0)
 547       tls_certificate_verified = TRUE;
 548     else if (Ustrncmp(p, "ls_cipher", 9) == 0)
 549       tls_cipher = string_copy(big_buffer + 12);
 550     else if (Ustrncmp(p, "ls_peerdn", 9) == 0)
 551       tls_peerdn = string_copy(big_buffer + 12);
 552     break;
 553     #endif
 554
 555     default:    /* Present because some compilers complain if all */
 556     break;      /* possibilities are not covered. */
 557     }
 558   }
 559
 560 /* Build sender_fullhost if required */
 561
 562 #ifndef COMPILE_UTILITY
 563 host_build_sender_fullhost();
 564 #endif  /* COMPILE_UTILITY */
 565
 566 #ifndef COMPILE_UTILITY
 567 DEBUG(D_deliver)
 568   debug_printf("sender_local=%d ident=%s\n", sender_local,
 569     (sender_ident == NULL)? US"unset" : sender_ident);
 570 #endif  /* COMPILE_UTILITY */
 571
 572 /* We now have the tree of addresses NOT to deliver to, or a line
 573 containing "XX", indicating no tree. */
 574
 575 if (Ustrncmp(big_buffer, "XX\n", 3) != 0 &&
 576   !read_nonrecipients_tree(&tree_nonrecipients, f, big_buffer, big_buffer_size))
 577     goto SPOOL_FORMAT_ERROR;
 578
 579 #ifndef COMPILE_UTILITY
 580 DEBUG(D_deliver)
 581   {
 582   debug_printf("Non-recipients:\n");
 583   debug_print_tree(tree_nonrecipients);
 584   }
 585 #endif  /* COMPILE_UTILITY */
 586
 587 /* After reading the tree, the next line has not yet been read into the
 588 buffer. It contains the count of recipients which follow on separate lines. */
 589
 590 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 591 if (sscanf(CS big_buffer, "%d", &rcount) != 1) goto SPOOL_FORMAT_ERROR;
 592
 593 #ifndef COMPILE_UTILITY
 594 DEBUG(D_deliver) debug_printf("recipients_count=%d\n", rcount);
 595 #endif  /* COMPILE_UTILITY */
 596
 597 recipients_list_max = rcount;
 598 recipients_list = store_get(rcount * sizeof(recipient_item));
 599
 600 for (recipients_count = 0; recipients_count < rcount; recipients_count++)
 601   {
 602   int nn;
 603   int pno = -1;
 604   uschar *errors_to = NULL;
 605   uschar *p;
 606
 607   if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 608   nn = Ustrlen(big_buffer);
 609   if (nn < 2) goto SPOOL_FORMAT_ERROR;
 610
 611   /* Remove the newline; this terminates the address if there is no additional
 612   data on the line. */
 613
 614   p = big_buffer + nn - 1;
 615   *p-- = 0;
 616
 617   /* Look back from the end of the line for digits and special terminators.
 618   Since an address must end with a domain, we can tell that extra data is
 619   present by the presence of the terminator, which is always some character
 620   that cannot exist in a domain. (If I'd thought of the need for additional
 621   data early on, I'd have put it at the start, with the address at the end. As
 622   it is, we have to operate backwards. Addresses are permitted to contain
 623   spaces, you see.)
 624
 625   This code has to cope with various versions of this data that have evolved
 626   over time. In all cases, the line might just contain an address, with no
 627   additional data. Otherwise, the possibilities are as follows:
 628
 629   Exim 3 type:       <address><space><digits>,<digits>,<digits>
 630
 631     The second set of digits is the parent number for one_time addresses. The
 632     other values were remnants of earlier experiments that were abandoned.
 633
 634   Exim 4 first type: <address><space><digits>
 635
 636     The digits are the parent number for one_time addresses.
 637
 638   Exim 4 new type:   <address><space><data>#<type bits>
 639
 640     The type bits indicate what the contents of the data are.
 641
 642     Bit 01 indicates that, reading from right to left, the data
 643       ends with <errors_to address><space><len>,<pno> where pno is
 644       the parent number for one_time addresses, and len is the length
 645       of the errors_to address (zero meaning none).
 646    */
 647
 648   while (isdigit(*p)) p--;
 649
 650   /* Handle Exim 3 spool files */
 651
 652   if (*p == ',')
 653     {
 654     int dummy;
 655     while (isdigit(*(--p)) || *p == ',');
 656     if (*p == ' ')
 657       {
 658       *p++ = 0;
 659       (void)sscanf(CS p, "%d,%d", &dummy, &pno);
 660       }
 661     }
 662
 663   /* Handle early Exim 4 spool files */
 664
 665   else if (*p == ' ')
 666     {
 667     *p++ = 0;
 668     (void)sscanf(CS p, "%d", &pno);
 669     }
 670
 671   /* Handle current format Exim 4 spool files */
 672
 673   else if (*p == '#')
 674     {
 675     int flags;
 676     (void)sscanf(CS p+1, "%d", &flags);
 677
 678     if ((flags & 0x01) != 0)      /* one_time data exists */
 679       {
 680       int len;
 681       while (isdigit(*(--p)) || *p == ',' || *p == '-');
 682       (void)sscanf(CS p+1, "%d,%d", &len, &pno);
 683       *p = 0;
 684       if (len > 0)
 685         {
 686         p -= len;
 687         errors_to = string_copy(p);
 688         }
 689       }
 690
 691     *(--p) = 0;   /* Terminate address */
 692     }
 693
 694   recipients_list[recipients_count].address = string_copy(big_buffer);
 695   recipients_list[recipients_count].pno = pno;
 696   recipients_list[recipients_count].errors_to = errors_to;
 697   }
 698
 699 /* The remainder of the spool header file contains the headers for the message,
 700 separated off from the previous data by a blank line. Each header is preceded
 701 by a count of its length and either a certain letter (for various identified
 702 headers), space (for a miscellaneous live header) or an asterisk (for a header
 703 that has been rewritten). Count the Received: headers. We read the headers
 704 always, in order to check on the format of the file, but only create a header
 705 list if requested to do so. */
 706
 707 inheader = TRUE;
 708 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 709 if (big_buffer[0] != '\n') goto SPOOL_FORMAT_ERROR;
 710
 711 while ((n = fgetc(f)) != EOF)
 712   {
 713   header_line *h;
 714   uschar flag[4];
 715   int i;
 716
 717   if (!isdigit(n)) goto SPOOL_FORMAT_ERROR;
 718   (void)ungetc(n, f);
 719   (void)fscanf(f, "%d%c ", &n, flag);
 720   if (flag[0] != '*') message_size += n;  /* Omit non-transmitted headers */
 721
 722   if (read_headers)
 723     {
 724     h = store_get(sizeof(header_line));
 725     h->next = NULL;
 726     h->type = flag[0];
 727     h->slen = n;
 728     h->text = store_get(n+1);
 729
 730     if (h->type == htype_received) received_count++;
 731
 732     if (header_list == NULL) header_list = h;
 733       else header_last->next = h;
 734     header_last = h;
 735
 736     for (i = 0; i < n; i++)
 737       {
 738       int c = fgetc(f);
 739       if (c == 0 || c == EOF) goto SPOOL_FORMAT_ERROR;
 740       if (c == '\n' && h->type != htype_old) message_linecount++;
 741       h->text[i] = c;
 742       }
 743     h->text[i] = 0;
 744     }
 745
 746   /* Not requiring header data, just skip through the bytes */
 747
 748   else for (i = 0; i < n; i++)
 749     {
 750     int c = fgetc(f);
 751     if (c == 0 || c == EOF) goto SPOOL_FORMAT_ERROR;
 752     }
 753   }
 754
 755 /* We have successfully read the data in the header file. Update the message
 756 line count by adding the body linecount to the header linecount. Close the file
 757 and give a positive response. */
 758
 759 #ifndef COMPILE_UTILITY
 760 DEBUG(D_deliver) debug_printf("body_linecount=%d message_linecount=%d\n",
 761   body_linecount, message_linecount);
 762 #endif  /* COMPILE_UTILITY */
 763
 764 message_linecount += body_linecount;
 765
 766 fclose(f);
 767 return spool_read_OK;
 768
 769
 770 /* There was an error reading the spool or there was missing data,
 771 or there was a format error. A "read error" with no errno means an
 772 unexpected EOF, which we treat as a format error. */
 773
 774 SPOOL_READ_ERROR:
 775 if (errno != 0)
 776   {
 777   n = errno;
 778
 779   #ifndef COMPILE_UTILITY
 780   DEBUG(D_any) debug_printf("Error while reading spool file %s\n", name);
 781   #endif  /* COMPILE_UTILITY */
 782
 783   fclose(f);
 784   errno = n;
 785   return inheader? spool_read_hdrerror : spool_read_enverror;
 786   }
 787
 788 SPOOL_FORMAT_ERROR:
 789
 790 #ifndef COMPILE_UTILITY
 791 DEBUG(D_any) debug_printf("Format error in spool file %s\n", name);
 792 #endif  /* COMPILE_UTILITY */
 793
 794 fclose(f);
 795 errno = ERRNO_SPOOLFORMAT;
 796 return inheader? spool_read_hdrerror : spool_read_enverror;
 797 }
 798
 799 /* End of spool_in.c */