src/src/transports/autoreply.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2018 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8
   9 #include "../exim.h"
  10 #include "autoreply.h"
  11
  12
  13
  14 /* Options specific to the autoreply transport. They must be in alphabetic
  15 order (note that "_" comes before the lower case letters). Those starting
  16 with "*" are not settable by the user but are used by the option-reading
  17 software for alternative value types. Some options are publicly visible and so
  18 are stored in the driver instance block. These are flagged with opt_public. */
  19
  20 optionlist autoreply_transport_options[] = {
  21   { "bcc",               opt_stringptr,
  22       (void *)offsetof(autoreply_transport_options_block, bcc) },
  23   { "cc",                opt_stringptr,
  24       (void *)offsetof(autoreply_transport_options_block, cc) },
  25   { "file",              opt_stringptr,
  26       (void *)offsetof(autoreply_transport_options_block, file) },
  27   { "file_expand",     opt_bool,
  28       (void *)offsetof(autoreply_transport_options_block, file_expand) },
  29   { "file_optional",     opt_bool,
  30       (void *)offsetof(autoreply_transport_options_block, file_optional) },
  31   { "from",              opt_stringptr,
  32       (void *)offsetof(autoreply_transport_options_block, from) },
  33   { "headers",           opt_stringptr,
  34       (void *)offsetof(autoreply_transport_options_block, headers) },
  35   { "log",               opt_stringptr,
  36       (void *)offsetof(autoreply_transport_options_block, logfile) },
  37   { "mode",              opt_octint,
  38       (void *)offsetof(autoreply_transport_options_block, mode) },
  39   { "never_mail",        opt_stringptr,
  40       (void *)offsetof(autoreply_transport_options_block, never_mail) },
  41   { "once",              opt_stringptr,
  42       (void *)offsetof(autoreply_transport_options_block, oncelog) },
  43   { "once_file_size",    opt_int,
  44       (void *)offsetof(autoreply_transport_options_block, once_file_size) },
  45   { "once_repeat",       opt_stringptr,
  46       (void *)offsetof(autoreply_transport_options_block, once_repeat) },
  47   { "reply_to",          opt_stringptr,
  48       (void *)offsetof(autoreply_transport_options_block, reply_to) },
  49   { "return_message",    opt_bool,
  50       (void *)offsetof(autoreply_transport_options_block, return_message) },
  51   { "subject",           opt_stringptr,
  52       (void *)offsetof(autoreply_transport_options_block, subject) },
  53   { "text",              opt_stringptr,
  54       (void *)offsetof(autoreply_transport_options_block, text) },
  55   { "to",                opt_stringptr,
  56       (void *)offsetof(autoreply_transport_options_block, to) },
  57 };
  58
  59 /* Size of the options list. An extern variable has to be used so that its
  60 address can appear in the tables drtables.c. */
  61
  62 int autoreply_transport_options_count =
  63   sizeof(autoreply_transport_options)/sizeof(optionlist);
  64
  65
  66 #ifdef MACRO_PREDEF
  67
  68 /* Dummy values */
  69 autoreply_transport_options_block autoreply_transport_option_defaults = {0};
  70 void autoreply_transport_init(transport_instance *tblock) {}
  71 BOOL autoreply_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
  72
  73 #else   /*!MACRO_PREDEF*/
  74
  75
  76 /* Default private options block for the autoreply transport. */
  77
  78 autoreply_transport_options_block autoreply_transport_option_defaults = {
  79   NULL,           /* from */
  80   NULL,           /* reply_to */
  81   NULL,           /* to */
  82   NULL,           /* cc */
  83   NULL,           /* bcc */
  84   NULL,           /* subject */
  85   NULL,           /* headers */
  86   NULL,           /* text */
  87   NULL,           /* file */
  88   NULL,           /* logfile */
  89   NULL,           /* oncelog */
  90   NULL,           /* once_repeat */
  91   NULL,           /* never_mail */
  92   0600,           /* mode */
  93   0,              /* once_file_size */
  94   FALSE,          /* file_expand */
  95   FALSE,          /* file_optional */
  96   FALSE           /* return message */
  97 };
  98
  99
 100
 101 /* Type of text for the checkexpand() function */
 102
 103 enum { cke_text, cke_hdr, cke_file };
 104
 105
 106
 107 /*************************************************
 108 *          Initialization entry point            *
 109 *************************************************/
 110
 111 /* Called for each instance, after its options have been read, to
 112 enable consistency checks to be done, or anything else that needs
 113 to be set up. */
 114
 115 void
 116 autoreply_transport_init(transport_instance *tblock)
 117 {
 118 /*
 119 autoreply_transport_options_block *ob =
 120   (autoreply_transport_options_block *)(tblock->options_block);
 121 */
 122
 123 /* If a fixed uid field is set, then a gid field must also be set. */
 124
 125 if (tblock->uid_set && !tblock->gid_set && tblock->expand_gid == NULL)
 126   log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
 127     "user set without group for the %s transport", tblock->name);
 128 }
 129
 130
 131
 132
 133 /*************************************************
 134 *          Expand string and check               *
 135 *************************************************/
 136
 137 /* If the expansion fails, the error is set up in the address. Expanded
 138 strings must be checked to ensure they contain only printing characters
 139 and white space. If not, the function fails.
 140
 141 Arguments:
 142    s         string to expand
 143    addr      address that is being worked on
 144    name      transport name, for error text
 145    type      type, for checking content:
 146                cke_text => no check
 147                cke_hdr  => header, allow \n + whitespace
 148                cke_file => file name, no non-printers allowed
 149
 150 Returns:     expanded string if expansion succeeds;
 151              NULL otherwise
 152 */
 153
 154 static uschar *
 155 checkexpand(uschar *s, address_item *addr, uschar *name, int type)
 156 {
 157 uschar *ss = expand_string(s);
 158
 159 if (ss == NULL)
 160   {
 161   addr->transport_return = FAIL;
 162   addr->message = string_sprintf("Expansion of \"%s\" failed in %s transport: "
 163     "%s", s, name, expand_string_message);
 164   return NULL;
 165   }
 166
 167 if (type != cke_text) for (uschar * t = ss; *t != 0; t++)
 168   {
 169   int c = *t;
 170   const uschar * sp;
 171   if (mac_isprint(c)) continue;
 172   if (type == cke_hdr && c == '\n' && (t[1] == ' ' || t[1] == '\t')) continue;
 173   sp = string_printing(s);
 174   addr->transport_return = FAIL;
 175   addr->message = string_sprintf("Expansion of \"%s\" in %s transport "
 176     "contains non-printing character %d", sp, name, c);
 177   return NULL;
 178   }
 179
 180 return ss;
 181 }
 182
 183
 184
 185
 186 /*************************************************
 187 *          Check a header line for never_mail    *
 188 *************************************************/
 189
 190 /* This is called to check to, cc, and bcc for addresses in the never_mail
 191 list. Any that are found are removed.
 192
 193 Arguments:
 194   listptr     points to the list of addresses
 195   never_mail  an address list, already expanded
 196
 197 Returns:      nothing
 198 */
 199
 200 static void
 201 check_never_mail(uschar **listptr, const uschar *never_mail)
 202 {
 203 uschar *s = *listptr;
 204
 205 while (*s != 0)
 206   {
 207   uschar *error, *next;
 208   uschar *e = parse_find_address_end(s, FALSE);
 209   int terminator = *e;
 210   int start, end, domain, rc;
 211
 212   /* Temporarily terminate the string at the address end while extracting
 213   the operative address within. */
 214
 215   *e = 0;
 216   next = parse_extract_address(s, &error, &start, &end, &domain, FALSE);
 217   *e = terminator;
 218
 219   /* If there is some kind of syntax error, just give up on this header
 220   line. */
 221
 222   if (next == NULL) break;
 223
 224   /* See if the address is on the never_mail list */
 225
 226   rc = match_address_list(next,         /* address to check */
 227                           TRUE,         /* start caseless */
 228                           FALSE,        /* don't expand the list */
 229                           &never_mail,  /* the list */
 230                           NULL,         /* no caching */
 231                           -1,           /* no expand setup */
 232                           0,            /* separator from list */
 233                           NULL);        /* no lookup value return */
 234
 235   if (rc == OK)                         /* Remove this address */
 236     {
 237     DEBUG(D_transport)
 238       debug_printf("discarding recipient %s (matched never_mail)\n", next);
 239     if (terminator == ',') e++;
 240     memmove(s, e, Ustrlen(e) + 1);
 241     }
 242   else                                  /* Skip over this address */
 243     {
 244     s = e;
 245     if (terminator == ',') s++;
 246     }
 247   }
 248
 249 /* Check to see if we removed the last address, leaving a terminating comma
 250 that needs to be removed */
 251
 252 s = *listptr + Ustrlen(*listptr);
 253 while (s > *listptr && (isspace(s[-1]) || s[-1] == ',')) s--;
 254 *s = 0;
 255
 256 /* Check to see if there any addresses left; if not, set NULL */
 257
 258 s = *listptr;
 259 while (s != 0 && isspace(*s)) s++;
 260 if (*s == 0) *listptr = NULL;
 261 }
 262
 263
 264
 265 /*************************************************
 266 *              Main entry point                  *
 267 *************************************************/
 268
 269 /* See local README for interface details. This transport always returns
 270 FALSE, indicating that the top address has the status for all - though in fact
 271 this transport can handle only one address at at time anyway. */
 272
 273 BOOL
 274 autoreply_transport_entry(
 275   transport_instance *tblock,      /* data for this instantiation */
 276   address_item *addr)              /* address we are working on */
 277 {
 278 int fd, pid, rc;
 279 int cache_fd = -1;
 280 int cache_size = 0;
 281 int add_size = 0;
 282 EXIM_DB *dbm_file = NULL;
 283 BOOL file_expand, return_message;
 284 uschar *from, *reply_to, *to, *cc, *bcc, *subject, *headers, *text, *file;
 285 uschar *logfile, *oncelog;
 286 uschar *cache_buff = NULL;
 287 uschar *cache_time = NULL;
 288 uschar *message_id = NULL;
 289 header_line *h;
 290 time_t now = time(NULL);
 291 time_t once_repeat_sec = 0;
 292 FILE *fp;
 293 FILE *ff = NULL;
 294
 295 autoreply_transport_options_block *ob =
 296   (autoreply_transport_options_block *)(tblock->options_block);
 297
 298 DEBUG(D_transport) debug_printf("%s transport entered\n", tblock->name);
 299
 300 /* Set up for the good case */
 301
 302 addr->transport_return = OK;
 303 addr->basic_errno = 0;
 304
 305 /* If the address is pointing to a reply block, then take all the data
 306 from that block. It has typically been set up by a mail filter processing
 307 router. Otherwise, the data must be supplied by this transport, and
 308 it has to be expanded here. */
 309
 310 if (addr->reply != NULL)
 311   {
 312   DEBUG(D_transport) debug_printf("taking data from address\n");
 313   from = addr->reply->from;
 314   reply_to = addr->reply->reply_to;
 315   to = addr->reply->to;
 316   cc = addr->reply->cc;
 317   bcc = addr->reply->bcc;
 318   subject = addr->reply->subject;
 319   headers = addr->reply->headers;
 320   text = addr->reply->text;
 321   file = addr->reply->file;
 322   logfile = addr->reply->logfile;
 323   oncelog = addr->reply->oncelog;
 324   once_repeat_sec = addr->reply->once_repeat;
 325   file_expand = addr->reply->file_expand;
 326   expand_forbid = addr->reply->expand_forbid;
 327   return_message = addr->reply->return_message;
 328   }
 329 else
 330   {
 331   uschar *oncerepeat = ob->once_repeat;
 332
 333   DEBUG(D_transport) debug_printf("taking data from transport\n");
 334   from = ob->from;
 335   reply_to = ob->reply_to;
 336   to = ob->to;
 337   cc = ob->cc;
 338   bcc = ob->bcc;
 339   subject = ob->subject;
 340   headers = ob->headers;
 341   text = ob->text;
 342   file = ob->file;
 343   logfile = ob->logfile;
 344   oncelog = ob->oncelog;
 345   file_expand = ob->file_expand;
 346   return_message = ob->return_message;
 347
 348   if (  from && !(from = checkexpand(from, addr, tblock->name, cke_hdr))
 349      || reply_to && !(reply_to = checkexpand(reply_to, addr, tblock->name, cke_hdr))
 350      || to && !(to = checkexpand(to, addr, tblock->name, cke_hdr))
 351      || cc && !(cc = checkexpand(cc, addr, tblock->name, cke_hdr))
 352      || bcc && !(bcc = checkexpand(bcc, addr, tblock->name, cke_hdr))
 353      || subject && !(subject = checkexpand(subject, addr, tblock->name, cke_hdr))
 354      || headers && !(headers = checkexpand(headers, addr, tblock->name, cke_text))
 355      || text && !(text = checkexpand(text, addr, tblock->name, cke_text))
 356      || file && !(file = checkexpand(file, addr, tblock->name, cke_file))
 357      || logfile && !(logfile = checkexpand(logfile, addr, tblock->name, cke_file))
 358      || oncelog && !(oncelog = checkexpand(oncelog, addr, tblock->name, cke_file))
 359      || oncerepeat && !(oncerepeat = checkexpand(oncerepeat, addr, tblock->name, cke_file))
 360      )
 361     return FALSE;
 362
 363   if (oncerepeat)
 364     {
 365     once_repeat_sec = readconf_readtime(oncerepeat, 0, FALSE);
 366     if (once_repeat_sec < 0)
 367       {
 368       addr->transport_return = FAIL;
 369       addr->message = string_sprintf("Invalid time value \"%s\" for "
 370         "\"once_repeat\" in %s transport", oncerepeat, tblock->name);
 371       return FALSE;
 372       }
 373     }
 374   }
 375
 376 /* If the never_mail option is set, we have to scan all the recipients and
 377 remove those that match. */
 378
 379 if (ob->never_mail)
 380   {
 381   const uschar *never_mail = expand_string(ob->never_mail);
 382
 383   if (!never_mail)
 384     {
 385     addr->transport_return = FAIL;
 386     addr->message = string_sprintf("Failed to expand \"%s\" for "
 387       "\"never_mail\" in %s transport", ob->never_mail, tblock->name);
 388     return FALSE;
 389     }
 390
 391   if (to) check_never_mail(&to, never_mail);
 392   if (cc) check_never_mail(&cc, never_mail);
 393   if (bcc) check_never_mail(&bcc, never_mail);
 394
 395   if (!to && !cc && !bcc)
 396     {
 397     DEBUG(D_transport)
 398       debug_printf("*** all recipients removed by never_mail\n");
 399     return OK;
 400     }
 401   }
 402
 403 /* If the -N option is set, can't do any more. */
 404
 405 if (f.dont_deliver)
 406   {
 407   DEBUG(D_transport)
 408     debug_printf("*** delivery by %s transport bypassed by -N option\n",
 409       tblock->name);
 410   return FALSE;
 411   }
 412
 413
 414 /* If the oncelog field is set, we send want to send only one message to the
 415 given recipient(s). This works only on the "To" field. If there is no "To"
 416 field, the message is always sent. If the To: field contains more than one
 417 recipient, the effect might not be quite as envisaged. If once_file_size is
 418 set, instead of a dbm file, we use a regular file containing a circular buffer
 419 recipient cache. */
 420
 421 if (oncelog && *oncelog != 0 && to)
 422   {
 423   time_t then = 0;
 424
 425   /* Handle fixed-size cache file. */
 426
 427   if (ob->once_file_size > 0)
 428     {
 429     uschar * nextp;
 430     struct stat statbuf;
 431     cache_fd = Uopen(oncelog, O_CREAT|O_RDWR, ob->mode);
 432
 433     if (cache_fd < 0 || fstat(cache_fd, &statbuf) != 0)
 434       {
 435       addr->transport_return = DEFER;
 436       addr->message = string_sprintf("Failed to %s \"once\" file %s when "
 437         "sending message from %s transport: %s",
 438         (cache_fd < 0)? "open" : "stat", oncelog, tblock->name,
 439           strerror(errno));
 440       goto END_OFF;
 441       }
 442
 443     /* Get store in the temporary pool and read the entire file into it. We get
 444     an amount of store that is big enough to add the new entry on the end if we
 445     need to do that. */
 446
 447     cache_size = statbuf.st_size;
 448     add_size = sizeof(time_t) + Ustrlen(to) + 1;
 449     cache_buff = store_get(cache_size + add_size, is_tainted(oncelog));
 450
 451     if (read(cache_fd, cache_buff, cache_size) != cache_size)
 452       {
 453       addr->transport_return = DEFER;
 454       addr->basic_errno = errno;
 455       addr->message = US"error while reading \"once\" file";
 456       goto END_OFF;
 457       }
 458
 459     DEBUG(D_transport) debug_printf("%d bytes read from %s\n", cache_size, oncelog);
 460
 461     /* Scan the data for this recipient. Each entry in the file starts with
 462     a time_t sized time value, followed by the address, followed by a binary
 463     zero. If we find a match, put the time into "then", and the place where it
 464     was found into "cache_time". Otherwise, "then" is left at zero. */
 465
 466     for (uschar * p = cache_buff; p < cache_buff + cache_size; p = nextp)
 467       {
 468       uschar *s = p + sizeof(time_t);
 469       nextp = s + Ustrlen(s) + 1;
 470       if (Ustrcmp(to, s) == 0)
 471         {
 472         memcpy(&then, p, sizeof(time_t));
 473         cache_time = p;
 474         break;
 475         }
 476       }
 477     }
 478
 479   /* Use a DBM file for the list of previous recipients. */
 480
 481   else
 482     {
 483     EXIM_DATUM key_datum, result_datum;
 484     uschar * dirname = string_copy(oncelog);
 485     uschar * s;
 486
 487     if ((s = Ustrrchr(dirname, '/'))) *s = '\0';
 488     EXIM_DBOPEN(oncelog, dirname, O_RDWR|O_CREAT, ob->mode, &dbm_file);
 489     if (!dbm_file)
 490       {
 491       addr->transport_return = DEFER;
 492       addr->message = string_sprintf("Failed to open %s file %s when sending "
 493         "message from %s transport: %s", EXIM_DBTYPE, oncelog, tblock->name,
 494         strerror(errno));
 495       goto END_OFF;
 496       }
 497
 498     EXIM_DATUM_INIT(key_datum);        /* Some DBM libraries need datums */
 499     EXIM_DATUM_INIT(result_datum);     /* to be cleared */
 500     EXIM_DATUM_DATA(key_datum) = CS to;
 501     EXIM_DATUM_SIZE(key_datum) = Ustrlen(to) + 1;
 502
 503     if (EXIM_DBGET(dbm_file, key_datum, result_datum))
 504       {
 505       /* If the datum size is that of a binary time, we are in the new world
 506       where messages are sent periodically. Otherwise the file is an old one,
 507       where the datum was filled with a tod_log time, which is assumed to be
 508       different in size. For that, only one message is ever sent. This change
 509       introduced at Exim 3.00. In a couple of years' time the test on the size
 510       can be abolished. */
 511
 512       if (EXIM_DATUM_SIZE(result_datum) == sizeof(time_t))
 513         memcpy(&then, EXIM_DATUM_DATA(result_datum), sizeof(time_t));
 514       else
 515         then = now;
 516       }
 517     }
 518
 519   /* Either "then" is set zero, if no message has yet been sent, or it
 520   is set to the time of the last sending. */
 521
 522   if (then != 0 && (once_repeat_sec <= 0 || now - then < once_repeat_sec))
 523     {
 524     int log_fd;
 525     DEBUG(D_transport) debug_printf("message previously sent to %s%s\n", to,
 526       (once_repeat_sec > 0)? " and repeat time not reached" : "");
 527     log_fd = logfile ? Uopen(logfile, O_WRONLY|O_APPEND|O_CREAT, ob->mode) : -1;
 528     if (log_fd >= 0)
 529       {
 530       uschar *ptr = log_buffer;
 531       sprintf(CS ptr, "%s\n  previously sent to %.200s\n", tod_stamp(tod_log), to);
 532       while(*ptr) ptr++;
 533       if(write(log_fd, log_buffer, ptr - log_buffer) != ptr-log_buffer
 534         || close(log_fd))
 535         DEBUG(D_transport) debug_printf("Problem writing log file %s for %s "
 536           "transport\n", logfile, tblock->name);
 537       }
 538     goto END_OFF;
 539     }
 540
 541   DEBUG(D_transport) debug_printf("%s %s\n", (then <= 0)?
 542     "no previous message sent to" : "repeat time reached for", to);
 543   }
 544
 545 /* We are going to send a message. Ensure any requested file is available. */
 546
 547 if (file)
 548   {
 549   ff = Ufopen(file, "rb");
 550   if (!ff && !ob->file_optional)
 551     {
 552     addr->transport_return = DEFER;
 553     addr->message = string_sprintf("Failed to open file %s when sending "
 554       "message from %s transport: %s", file, tblock->name, strerror(errno));
 555     return FALSE;
 556     }
 557   }
 558
 559 /* Make a subprocess to send the message */
 560
 561 pid = child_open_exim(&fd);
 562
 563 /* Creation of child failed; defer this delivery. */
 564
 565 if (pid < 0)
 566   {
 567   addr->transport_return = DEFER;
 568   addr->message = string_sprintf("Failed to create child process to send "
 569     "message from %s transport: %s", tblock->name, strerror(errno));
 570   DEBUG(D_transport) debug_printf("%s\n", addr->message);
 571   if (dbm_file) EXIM_DBCLOSE(dbm_file);
 572   return FALSE;
 573   }
 574
 575 /* Create the message to be sent - recipients are taken from the headers,
 576 as the -t option is used. The "headers" stuff *must* be last in case there
 577 are newlines in it which might, if placed earlier, screw up other headers. */
 578
 579 fp = fdopen(fd, "wb");
 580
 581 if (from) fprintf(fp, "From: %s\n", from);
 582 if (reply_to) fprintf(fp, "Reply-To: %s\n", reply_to);
 583 if (to) fprintf(fp, "To: %s\n", to);
 584 if (cc) fprintf(fp, "Cc: %s\n", cc);
 585 if (bcc) fprintf(fp, "Bcc: %s\n", bcc);
 586 if (subject) fprintf(fp, "Subject: %s\n", subject);
 587
 588 /* Generate In-Reply-To from the message_id header; there should
 589 always be one, but code defensively. */
 590
 591 for (h = header_list; h; h = h->next)
 592   if (h->type == htype_id) break;
 593
 594 if (h)
 595   {
 596   message_id = Ustrchr(h->text, ':') + 1;
 597   while (isspace(*message_id)) message_id++;
 598   fprintf(fp, "In-Reply-To: %s", message_id);
 599   }
 600
 601 moan_write_references(fp, message_id);
 602
 603 /* Add an Auto-Submitted: header */
 604
 605 fprintf(fp, "Auto-Submitted: auto-replied\n");
 606
 607 /* Add any specially requested headers */
 608
 609 if (headers) fprintf(fp, "%s\n", headers);
 610 fprintf(fp, "\n");
 611
 612 if (text)
 613   {
 614   fprintf(fp, "%s", CS text);
 615   if (text[Ustrlen(text)-1] != '\n') fprintf(fp, "\n");
 616   }
 617
 618 if (ff)
 619   {
 620   while (Ufgets(big_buffer, big_buffer_size, ff) != NULL)
 621     {
 622     if (file_expand)
 623       {
 624       uschar *s = expand_string(big_buffer);
 625       DEBUG(D_transport)
 626         {
 627         if (!s)
 628           debug_printf("error while expanding line from file:\n  %s\n  %s\n",
 629             big_buffer, expand_string_message);
 630         }
 631       fprintf(fp, "%s", s ? CS s : CS big_buffer);
 632       }
 633     else fprintf(fp, "%s", CS big_buffer);
 634     }
 635   (void) fclose(ff);
 636   }
 637
 638 /* Copy the original message if required, observing the return size
 639 limit if we are returning the body. */
 640
 641 if (return_message)
 642   {
 643   uschar *rubric = (tblock->headers_only)?
 644     US"------ This is a copy of the message's header lines.\n"
 645     : (tblock->body_only)?
 646     US"------ This is a copy of the body of the message, without the headers.\n"
 647     :
 648     US"------ This is a copy of the message, including all the headers.\n";
 649   transport_ctx tctx = {
 650     .u = {.fd = fileno(fp)},
 651     .tblock = tblock,
 652     .addr = addr,
 653     .check_string = NULL,
 654     .escape_string =  NULL,
 655     .options = (tblock->body_only ? topt_no_headers : 0)
 656         | (tblock->headers_only ? topt_no_body : 0)
 657         | (tblock->return_path_add ? topt_add_return_path : 0)
 658         | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
 659         | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
 660         | topt_not_socket
 661   };
 662
 663   if (bounce_return_size_limit > 0 && !tblock->headers_only)
 664     {
 665     struct stat statbuf;
 666     int max = (bounce_return_size_limit/DELIVER_IN_BUFFER_SIZE + 1) *
 667       DELIVER_IN_BUFFER_SIZE;
 668     if (fstat(deliver_datafile, &statbuf) == 0 && statbuf.st_size > max)
 669       {
 670       fprintf(fp, "\n%s"
 671 "------ The body of the message is " OFF_T_FMT " characters long; only the first\n"
 672 "------ %d or so are included here.\n\n", rubric, statbuf.st_size,
 673         (max/1000)*1000);
 674       }
 675     else fprintf(fp, "\n%s\n", rubric);
 676     }
 677   else fprintf(fp, "\n%s\n", rubric);
 678
 679   fflush(fp);
 680   transport_count = 0;
 681   transport_write_message(&tctx, bounce_return_size_limit);
 682   }
 683
 684 /* End the message and wait for the child process to end; no timeout. */
 685
 686 (void)fclose(fp);
 687 rc = child_close(pid, 0);
 688
 689 /* Update the "sent to" log whatever the yield. This errs on the side of
 690 missing out a message rather than risking sending more than one. We either have
 691 cache_fd set to a fixed size, circular buffer file, or dbm_file set to an open
 692 DBM file (or neither, if "once" is not set). */
 693
 694 /* Update fixed-size cache file. If cache_time is set, we found a previous
 695 entry; that is the spot into which to put the current time. Otherwise we have
 696 to add a new record; remove the first one in the file if the file is too big.
 697 We always rewrite the entire file in a single write operation. This is
 698 (hopefully) going to be the safest thing because there is no interlocking
 699 between multiple simultaneous deliveries. */
 700
 701 if (cache_fd >= 0)
 702   {
 703   uschar *from = cache_buff;
 704   int size = cache_size;
 705
 706   if (lseek(cache_fd, 0, SEEK_SET) == 0)
 707     {
 708     if (!cache_time)
 709       {
 710       cache_time = from + size;
 711       memcpy(cache_time + sizeof(time_t), to, add_size - sizeof(time_t));
 712       size += add_size;
 713
 714       if (cache_size > 0 && size > ob->once_file_size)
 715         {
 716         from += sizeof(time_t) + Ustrlen(from + sizeof(time_t)) + 1;
 717         size -= (from - cache_buff);
 718         }
 719       }
 720
 721     memcpy(cache_time, &now, sizeof(time_t));
 722     if(write(cache_fd, from, size) != size)
 723       DEBUG(D_transport) debug_printf("Problem writing cache file %s for %s "
 724         "transport\n", oncelog, tblock->name);
 725     }
 726   }
 727
 728 /* Update DBM file */
 729
 730 else if (dbm_file)
 731   {
 732   EXIM_DATUM key_datum, value_datum;
 733   EXIM_DATUM_INIT(key_datum);          /* Some DBM libraries need to have */
 734   EXIM_DATUM_INIT(value_datum);        /* cleared datums. */
 735   EXIM_DATUM_DATA(key_datum) = CS to;
 736   EXIM_DATUM_SIZE(key_datum) = Ustrlen(to) + 1;
 737
 738   /* Many OS define the datum value, sensibly, as a void *. However, there
 739   are some which still have char *. By casting this address to a char * we
 740   can avoid warning messages from the char * systems. */
 741
 742   EXIM_DATUM_DATA(value_datum) = CS (&now);
 743   EXIM_DATUM_SIZE(value_datum) = (int)sizeof(time_t);
 744   EXIM_DBPUT(dbm_file, key_datum, value_datum);
 745   }
 746
 747 /* If sending failed, defer to try again - but if once is set the next
 748 try will skip, of course. However, if there were no recipients in the
 749 message, we do not fail. */
 750
 751 if (rc != 0)
 752   if (rc == EXIT_NORECIPIENTS)
 753     {
 754     DEBUG(D_any) debug_printf("%s transport: message contained no recipients\n",
 755       tblock->name);
 756     }
 757   else
 758     {
 759     addr->transport_return = DEFER;
 760     addr->message = string_sprintf("Failed to send message from %s "
 761       "transport (%d)", tblock->name, rc);
 762     goto END_OFF;
 763     }
 764
 765 /* Log the sending of the message if successful and required. If the file
 766 fails to open, it's hard to know what to do. We cannot write to the Exim
 767 log from here, since we may be running under an unprivileged uid. We don't
 768 want to fail the delivery, since the message has been successfully sent. For
 769 the moment, ignore open failures. Write the log entry as a single write() to a
 770 file opened for appending, in order to avoid interleaving of output from
 771 different processes. The log_buffer can be used exactly as for main log
 772 writing. */
 773
 774 if (logfile)
 775   {
 776   int log_fd = Uopen(logfile, O_WRONLY|O_APPEND|O_CREAT, ob->mode);
 777   if (log_fd >= 0)
 778     {
 779     gstring gs = { .size = LOG_BUFFER_SIZE, .ptr = 0, .s = log_buffer }, *g = &gs;
 780
 781     /* Use taint-unchecked routines for writing into log_buffer, trusting
 782     that we'll never expand it. */
 783
 784     DEBUG(D_transport) debug_printf("logging message details\n");
 785     g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "%s\n", tod_stamp(tod_log));
 786     if (from)
 787       g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "  From: %s\n", from);
 788     if (to)
 789       g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "  To: %s\n", to);
 790     if (cc)
 791       g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "  Cc: %s\n", cc);
 792     if (bcc)
 793       g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "  Bcc: %s\n", bcc);
 794     if (subject)
 795       g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "  Subject: %s\n", subject);
 796     if (headers)
 797       g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "  %s\n", headers);
 798     if(write(log_fd, g->s, g->ptr) != g->ptr || close(log_fd))
 799       DEBUG(D_transport) debug_printf("Problem writing log file %s for %s "
 800         "transport\n", logfile, tblock->name);
 801     }
 802   else DEBUG(D_transport) debug_printf("Failed to open log file %s for %s "
 803     "transport: %s\n", logfile, tblock->name, strerror(errno));
 804   }
 805
 806 END_OFF:
 807 if (dbm_file) EXIM_DBCLOSE(dbm_file);
 808 if (cache_fd > 0) (void)close(cache_fd);
 809
 810 DEBUG(D_transport) debug_printf("%s transport succeeded\n", tblock->name);
 811
 812 return FALSE;
 813 }
 814
 815 #endif  /*!MACRO_PREDEF*/
 816 /* End of transport/autoreply.c */