src/src/spool_in.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2012 */
   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_in.certificate_verified = FALSE;
 287 tls_in.cipher = NULL;
 288 tls_in.ourcert = NULL;
 289 tls_in.peercert = NULL;
 290 tls_in.peerdn = NULL;
 291 tls_in.sni = NULL;
 292 #endif
 293
 294 #ifdef WITH_CONTENT_SCAN
 295 spam_score_int = NULL;
 296 #endif
 297
 298 /* Generate the full name and open the file. If message_subdir is already
 299 set, just look in the given directory. Otherwise, look in both the split
 300 and unsplit directories, as for the data file above. */
 301
 302 for (n = 0; n < 2; n++)
 303   {
 304   if (!subdir_set)
 305     message_subdir[0] = (split_spool_directory == (n == 0))? name[5] : 0;
 306   sprintf(CS big_buffer, "%s/input/%s/%s", spool_directory, message_subdir,
 307     name);
 308   f = Ufopen(big_buffer, "rb");
 309   if (f != NULL) break;
 310   if (n != 0 || subdir_set || errno != ENOENT) return spool_read_notopen;
 311   }
 312
 313 errno = 0;
 314
 315 #ifndef COMPILE_UTILITY
 316 DEBUG(D_deliver) debug_printf("reading spool file %s\n", name);
 317 #endif  /* COMPILE_UTILITY */
 318
 319 /* The first line of a spool file contains the message id followed by -H (i.e.
 320 the file name), in order to make the file self-identifying. */
 321
 322 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 323 if (Ustrlen(big_buffer) != MESSAGE_ID_LENGTH + 3 ||
 324     Ustrncmp(big_buffer, name, MESSAGE_ID_LENGTH + 2) != 0)
 325   goto SPOOL_FORMAT_ERROR;
 326
 327 /* The next three lines in the header file are in a fixed format. The first
 328 contains the login, uid, and gid of the user who caused the file to be written.
 329 There are known cases where a negative gid is used, so we allow for both
 330 negative uids and gids. The second contains the mail address of the message's
 331 sender, enclosed in <>. The third contains the time the message was received,
 332 and the number of warning messages for delivery delays that have been sent. */
 333
 334 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 335
 336 p = big_buffer + Ustrlen(big_buffer);
 337 while (p > big_buffer && isspace(p[-1])) p--;
 338 *p = 0;
 339 if (!isdigit(p[-1])) goto SPOOL_FORMAT_ERROR;
 340 while (p > big_buffer && (isdigit(p[-1]) || '-' == p[-1])) p--;
 341 gid = Uatoi(p);
 342 if (p <= big_buffer || *(--p) != ' ') goto SPOOL_FORMAT_ERROR;
 343 *p = 0;
 344 if (!isdigit(p[-1])) goto SPOOL_FORMAT_ERROR;
 345 while (p > big_buffer && (isdigit(p[-1]) || '-' == p[-1])) p--;
 346 uid = Uatoi(p);
 347 if (p <= big_buffer || *(--p) != ' ') goto SPOOL_FORMAT_ERROR;
 348 *p = 0;
 349
 350 originator_login = string_copy(big_buffer);
 351 originator_uid = (uid_t)uid;
 352 originator_gid = (gid_t)gid;
 353
 354 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 355 n = Ustrlen(big_buffer);
 356 if (n < 3 || big_buffer[0] != '<' || big_buffer[n-2] != '>')
 357   goto SPOOL_FORMAT_ERROR;
 358
 359 sender_address = store_get(n-2);
 360 Ustrncpy(sender_address, big_buffer+1, n-3);
 361 sender_address[n-3] = 0;
 362
 363 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 364 if (sscanf(CS big_buffer, "%d %d", &received_time, &warning_count) != 2)
 365   goto SPOOL_FORMAT_ERROR;
 366
 367 message_age = time(NULL) - received_time;
 368
 369 #ifndef COMPILE_UTILITY
 370 DEBUG(D_deliver) debug_printf("user=%s uid=%ld gid=%ld sender=%s\n",
 371   originator_login, (long int)originator_uid, (long int)originator_gid,
 372   sender_address);
 373 #endif  /* COMPILE_UTILITY */
 374
 375 /* Now there may be a number of optional lines, each starting with "-". If you
 376 add a new setting here, make sure you set the default above.
 377
 378 Because there are now quite a number of different possibilities, we use a
 379 switch on the first character to avoid too many failing tests. Thanks to Nico
 380 Erfurth for the patch that implemented this. I have made it even more efficient
 381 by not re-scanning the first two characters.
 382
 383 To allow new versions of Exim that add additional flags to interwork with older
 384 versions that do not understand them, just ignore any lines starting with "-"
 385 that we don't recognize. Otherwise it wouldn't be possible to back off a new
 386 version that left new-style flags written on the spool. */
 387
 388 p = big_buffer + 2;
 389 for (;;)
 390   {
 391   if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 392   if (big_buffer[0] != '-') break;
 393   big_buffer[Ustrlen(big_buffer) - 1] = 0;
 394
 395   switch(big_buffer[1])
 396     {
 397     case 'a':
 398
 399     /* Nowadays we use "-aclc" and "-aclm" for the different types of ACL
 400     variable, because Exim allows any number of them, with arbitrary names.
 401     The line in the spool file is "-acl[cm] <name> <length>". The name excludes
 402     the c or m. */
 403
 404     if (Ustrncmp(p, "clc ", 4) == 0 ||
 405         Ustrncmp(p, "clm ", 4) == 0)
 406       {
 407       uschar *name, *endptr;
 408       int count;
 409       tree_node *node;
 410       endptr = Ustrchr(big_buffer + 6, ' ');
 411       if (endptr == NULL) goto SPOOL_FORMAT_ERROR;
 412       name = string_sprintf("%c%.*s", big_buffer[4], endptr - big_buffer - 6,
 413         big_buffer + 6);
 414       if (sscanf(CS endptr, " %d", &count) != 1) goto SPOOL_FORMAT_ERROR;
 415       node = acl_var_create(name);
 416       node->data.ptr = store_get(count + 1);
 417       if (fread(node->data.ptr, 1, count+1, f) < count) goto SPOOL_READ_ERROR;
 418       ((uschar*)node->data.ptr)[count] = 0;
 419       }
 420
 421     else if (Ustrcmp(p, "llow_unqualified_recipient") == 0)
 422       allow_unqualified_recipient = TRUE;
 423     else if (Ustrcmp(p, "llow_unqualified_sender") == 0)
 424       allow_unqualified_sender = TRUE;
 425
 426     else if (Ustrncmp(p, "uth_id", 6) == 0)
 427       authenticated_id = string_copy(big_buffer + 9);
 428     else if (Ustrncmp(p, "uth_sender", 10) == 0)
 429       authenticated_sender = string_copy(big_buffer + 13);
 430     else if (Ustrncmp(p, "ctive_hostname", 14) == 0)
 431       smtp_active_hostname = string_copy(big_buffer + 17);
 432
 433     /* For long-term backward compatibility, we recognize "-acl", which was
 434     used before the number of ACL variables changed from 10 to 20. This was
 435     before the subsequent change to an arbitrary number of named variables.
 436     This code is retained so that upgrades from very old versions can still
 437     handle old-format spool files. The value given after "-acl" is a number
 438     that is 0-9 for connection variables, and 10-19 for message variables. */
 439
 440     else if (Ustrncmp(p, "cl ", 3) == 0)
 441       {
 442       int index, count;
 443       uschar name[20];   /* Need plenty of space for %d format */
 444       tree_node *node;
 445       if (sscanf(CS big_buffer + 5, "%d %d", &index, &count) != 2)
 446         goto SPOOL_FORMAT_ERROR;
 447       if (index < 10)
 448         (void) string_format(name, sizeof(name), "%c%d", 'c', index);
 449       else if (index < 20) /* ignore out-of-range index */
 450         (void) string_format(name, sizeof(name), "%c%d", 'm', index - 10);
 451       node = acl_var_create(name);
 452       node->data.ptr = store_get(count + 1);
 453       if (fread(node->data.ptr, 1, count+1, f) < count) goto SPOOL_READ_ERROR;
 454       ((uschar*)node->data.ptr)[count] = 0;
 455       }
 456     break;
 457
 458     case 'b':
 459     if (Ustrncmp(p, "ody_linecount", 13) == 0)
 460       body_linecount = Uatoi(big_buffer + 15);
 461     else if (Ustrncmp(p, "ody_zerocount", 13) == 0)
 462       body_zerocount = Uatoi(big_buffer + 15);
 463     #ifdef EXPERIMENTAL_BRIGHTMAIL
 464     else if (Ustrncmp(p, "mi_verdicts ", 12) == 0)
 465       bmi_verdicts = string_copy(big_buffer + 14);
 466     #endif
 467     break;
 468
 469     case 'd':
 470     if (Ustrcmp(p, "eliver_firsttime") == 0)
 471       deliver_firsttime = TRUE;
 472     break;
 473
 474     case 'f':
 475     if (Ustrncmp(p, "rozen", 5) == 0)
 476       {
 477       deliver_freeze = TRUE;
 478       deliver_frozen_at = Uatoi(big_buffer + 7);
 479       }
 480     break;
 481
 482     case 'h':
 483     if (Ustrcmp(p, "ost_lookup_deferred") == 0)
 484       host_lookup_deferred = TRUE;
 485     else if (Ustrcmp(p, "ost_lookup_failed") == 0)
 486       host_lookup_failed = TRUE;
 487     else if (Ustrncmp(p, "ost_auth", 8) == 0)
 488       sender_host_authenticated = string_copy(big_buffer + 11);
 489     else if (Ustrncmp(p, "ost_name", 8) == 0)
 490       sender_host_name = string_copy(big_buffer + 11);
 491     else if (Ustrncmp(p, "elo_name", 8) == 0)
 492       sender_helo_name = string_copy(big_buffer + 11);
 493
 494     /* We now record the port number after the address, separated by a
 495     dot. For compatibility during upgrading, do nothing if there
 496     isn't a value (it gets left at zero). */
 497
 498     else if (Ustrncmp(p, "ost_address", 11) == 0)
 499       {
 500       sender_host_port = host_address_extract_port(big_buffer + 14);
 501       sender_host_address = string_copy(big_buffer + 14);
 502       }
 503     break;
 504
 505     case 'i':
 506     if (Ustrncmp(p, "nterface_address", 16) == 0)
 507       {
 508       interface_port = host_address_extract_port(big_buffer + 19);
 509       interface_address = string_copy(big_buffer + 19);
 510       }
 511     else if (Ustrncmp(p, "dent", 4) == 0)
 512       sender_ident = string_copy(big_buffer + 7);
 513     break;
 514
 515     case 'l':
 516     if (Ustrcmp(p, "ocal") == 0) sender_local = TRUE;
 517     else if (Ustrcmp(big_buffer, "-localerror") == 0)
 518       local_error_message = TRUE;
 519     else if (Ustrncmp(p, "ocal_scan ", 10) == 0)
 520       local_scan_data = string_copy(big_buffer + 12);
 521     break;
 522
 523     case 'm':
 524     if (Ustrcmp(p, "anual_thaw") == 0) deliver_manual_thaw = TRUE;
 525     else if (Ustrncmp(p, "ax_received_linelength", 22) == 0)
 526       max_received_linelength = Uatoi(big_buffer + 24);
 527     break;
 528
 529     case 'N':
 530     if (*p == 0) dont_deliver = TRUE;   /* -N */
 531     break;
 532
 533     case 'r':
 534     if (Ustrncmp(p, "eceived_protocol", 16) == 0)
 535       received_protocol = string_copy(big_buffer + 19);
 536     break;
 537
 538     case 's':
 539     if (Ustrncmp(p, "ender_set_untrusted", 19) == 0)
 540       sender_set_untrusted = TRUE;
 541     #ifdef WITH_CONTENT_SCAN
 542     else if (Ustrncmp(p, "pam_score_int ", 14) == 0)
 543       spam_score_int = string_copy(big_buffer + 16);
 544     #endif
 545     break;
 546
 547     #ifdef SUPPORT_TLS
 548     case 't':
 549     if (Ustrncmp(p, "ls_certificate_verified", 23) == 0)
 550       tls_in.certificate_verified = TRUE;
 551     else if (Ustrncmp(p, "ls_cipher", 9) == 0)
 552       tls_in.cipher = string_copy(big_buffer + 12);
 553 #ifndef COMPILE_UTILITY
 554     else if (Ustrncmp(p, "ls_ourcert", 10) == 0)
 555       (void) tls_import_cert(big_buffer + 13, &tls_in.ourcert);
 556     else if (Ustrncmp(p, "ls_peercert", 11) == 0)
 557       (void) tls_import_cert(big_buffer + 14, &tls_in.peercert);
 558 #endif
 559     else if (Ustrncmp(p, "ls_peerdn", 9) == 0)
 560       tls_in.peerdn = string_unprinting(string_copy(big_buffer + 12));
 561     else if (Ustrncmp(p, "ls_sni", 6) == 0)
 562       tls_in.sni = string_unprinting(string_copy(big_buffer + 9));
 563     break;
 564     #endif
 565
 566     default:    /* Present because some compilers complain if all */
 567     break;      /* possibilities are not covered. */
 568     }
 569   }
 570
 571 /* Build sender_fullhost if required */
 572
 573 #ifndef COMPILE_UTILITY
 574 host_build_sender_fullhost();
 575 #endif  /* COMPILE_UTILITY */
 576
 577 #ifndef COMPILE_UTILITY
 578 DEBUG(D_deliver)
 579   debug_printf("sender_local=%d ident=%s\n", sender_local,
 580     (sender_ident == NULL)? US"unset" : sender_ident);
 581 #endif  /* COMPILE_UTILITY */
 582
 583 /* We now have the tree of addresses NOT to deliver to, or a line
 584 containing "XX", indicating no tree. */
 585
 586 if (Ustrncmp(big_buffer, "XX\n", 3) != 0 &&
 587   !read_nonrecipients_tree(&tree_nonrecipients, f, big_buffer, big_buffer_size))
 588     goto SPOOL_FORMAT_ERROR;
 589
 590 #ifndef COMPILE_UTILITY
 591 DEBUG(D_deliver)
 592   {
 593   debug_printf("Non-recipients:\n");
 594   debug_print_tree(tree_nonrecipients);
 595   }
 596 #endif  /* COMPILE_UTILITY */
 597
 598 /* After reading the tree, the next line has not yet been read into the
 599 buffer. It contains the count of recipients which follow on separate lines. */
 600
 601 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 602 if (sscanf(CS big_buffer, "%d", &rcount) != 1) goto SPOOL_FORMAT_ERROR;
 603
 604 #ifndef COMPILE_UTILITY
 605 DEBUG(D_deliver) debug_printf("recipients_count=%d\n", rcount);
 606 #endif  /* COMPILE_UTILITY */
 607
 608 recipients_list_max = rcount;
 609 recipients_list = store_get(rcount * sizeof(recipient_item));
 610
 611 for (recipients_count = 0; recipients_count < rcount; recipients_count++)
 612   {
 613   int nn;
 614   int pno = -1;
 615   uschar *errors_to = NULL;
 616   uschar *p;
 617
 618   if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 619   nn = Ustrlen(big_buffer);
 620   if (nn < 2) goto SPOOL_FORMAT_ERROR;
 621
 622   /* Remove the newline; this terminates the address if there is no additional
 623   data on the line. */
 624
 625   p = big_buffer + nn - 1;
 626   *p-- = 0;
 627
 628   /* Look back from the end of the line for digits and special terminators.
 629   Since an address must end with a domain, we can tell that extra data is
 630   present by the presence of the terminator, which is always some character
 631   that cannot exist in a domain. (If I'd thought of the need for additional
 632   data early on, I'd have put it at the start, with the address at the end. As
 633   it is, we have to operate backwards. Addresses are permitted to contain
 634   spaces, you see.)
 635
 636   This code has to cope with various versions of this data that have evolved
 637   over time. In all cases, the line might just contain an address, with no
 638   additional data. Otherwise, the possibilities are as follows:
 639
 640   Exim 3 type:       <address><space><digits>,<digits>,<digits>
 641
 642     The second set of digits is the parent number for one_time addresses. The
 643     other values were remnants of earlier experiments that were abandoned.
 644
 645   Exim 4 first type: <address><space><digits>
 646
 647     The digits are the parent number for one_time addresses.
 648
 649   Exim 4 new type:   <address><space><data>#<type bits>
 650
 651     The type bits indicate what the contents of the data are.
 652
 653     Bit 01 indicates that, reading from right to left, the data
 654       ends with <errors_to address><space><len>,<pno> where pno is
 655       the parent number for one_time addresses, and len is the length
 656       of the errors_to address (zero meaning none).
 657    */
 658
 659   while (isdigit(*p)) p--;
 660
 661   /* Handle Exim 3 spool files */
 662
 663   if (*p == ',')
 664     {
 665     int dummy;
 666     while (isdigit(*(--p)) || *p == ',');
 667     if (*p == ' ')
 668       {
 669       *p++ = 0;
 670       (void)sscanf(CS p, "%d,%d", &dummy, &pno);
 671       }
 672     }
 673
 674   /* Handle early Exim 4 spool files */
 675
 676   else if (*p == ' ')
 677     {
 678     *p++ = 0;
 679     (void)sscanf(CS p, "%d", &pno);
 680     }
 681
 682   /* Handle current format Exim 4 spool files */
 683
 684   else if (*p == '#')
 685     {
 686     int flags;
 687     (void)sscanf(CS p+1, "%d", &flags);
 688
 689     if ((flags & 0x01) != 0)      /* one_time data exists */
 690       {
 691       int len;
 692       while (isdigit(*(--p)) || *p == ',' || *p == '-');
 693       (void)sscanf(CS p+1, "%d,%d", &len, &pno);
 694       *p = 0;
 695       if (len > 0)
 696         {
 697         p -= len;
 698         errors_to = string_copy(p);
 699         }
 700       }
 701
 702     *(--p) = 0;   /* Terminate address */
 703     }
 704
 705   recipients_list[recipients_count].address = string_copy(big_buffer);
 706   recipients_list[recipients_count].pno = pno;
 707   recipients_list[recipients_count].errors_to = errors_to;
 708   }
 709
 710 /* The remainder of the spool header file contains the headers for the message,
 711 separated off from the previous data by a blank line. Each header is preceded
 712 by a count of its length and either a certain letter (for various identified
 713 headers), space (for a miscellaneous live header) or an asterisk (for a header
 714 that has been rewritten). Count the Received: headers. We read the headers
 715 always, in order to check on the format of the file, but only create a header
 716 list if requested to do so. */
 717
 718 inheader = TRUE;
 719 if (Ufgets(big_buffer, big_buffer_size, f) == NULL) goto SPOOL_READ_ERROR;
 720 if (big_buffer[0] != '\n') goto SPOOL_FORMAT_ERROR;
 721
 722 while ((n = fgetc(f)) != EOF)
 723   {
 724   header_line *h;
 725   uschar flag[4];
 726   int i;
 727
 728   if (!isdigit(n)) goto SPOOL_FORMAT_ERROR;
 729   if(ungetc(n, f) == EOF  ||  fscanf(f, "%d%c ", &n, flag) == EOF)
 730     goto SPOOL_READ_ERROR;
 731   if (flag[0] != '*') message_size += n;  /* Omit non-transmitted headers */
 732
 733   if (read_headers)
 734     {
 735     h = store_get(sizeof(header_line));
 736     h->next = NULL;
 737     h->type = flag[0];
 738     h->slen = n;
 739     h->text = store_get(n+1);
 740
 741     if (h->type == htype_received) received_count++;
 742
 743     if (header_list == NULL) header_list = h;
 744       else header_last->next = h;
 745     header_last = h;
 746
 747     for (i = 0; i < n; i++)
 748       {
 749       int c = fgetc(f);
 750       if (c == 0 || c == EOF) goto SPOOL_FORMAT_ERROR;
 751       if (c == '\n' && h->type != htype_old) message_linecount++;
 752       h->text[i] = c;
 753       }
 754     h->text[i] = 0;
 755     }
 756
 757   /* Not requiring header data, just skip through the bytes */
 758
 759   else for (i = 0; i < n; i++)
 760     {
 761     int c = fgetc(f);
 762     if (c == 0 || c == EOF) goto SPOOL_FORMAT_ERROR;
 763     }
 764   }
 765
 766 /* We have successfully read the data in the header file. Update the message
 767 line count by adding the body linecount to the header linecount. Close the file
 768 and give a positive response. */
 769
 770 #ifndef COMPILE_UTILITY
 771 DEBUG(D_deliver) debug_printf("body_linecount=%d message_linecount=%d\n",
 772   body_linecount, message_linecount);
 773 #endif  /* COMPILE_UTILITY */
 774
 775 message_linecount += body_linecount;
 776
 777 fclose(f);
 778 return spool_read_OK;
 779
 780
 781 /* There was an error reading the spool or there was missing data,
 782 or there was a format error. A "read error" with no errno means an
 783 unexpected EOF, which we treat as a format error. */
 784
 785 SPOOL_READ_ERROR:
 786 if (errno != 0)
 787   {
 788   n = errno;
 789
 790   #ifndef COMPILE_UTILITY
 791   DEBUG(D_any) debug_printf("Error while reading spool file %s\n", name);
 792   #endif  /* COMPILE_UTILITY */
 793
 794   fclose(f);
 795   errno = n;
 796   return inheader? spool_read_hdrerror : spool_read_enverror;
 797   }
 798
 799 SPOOL_FORMAT_ERROR:
 800
 801 #ifndef COMPILE_UTILITY
 802 DEBUG(D_any) debug_printf("Format error in spool file %s\n", name);
 803 #endif  /* COMPILE_UTILITY */
 804
 805 fclose(f);
 806 errno = ERRNO_SPOOLFORMAT;
 807 return inheader? spool_read_hdrerror : spool_read_enverror;
 808 }
 809
 810 /* vi: aw ai sw=2
 811 */
 812 /* End of spool_in.c */