dma.c

   1 /*
   2  * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Simon 'corecode' Schubert <corecode@fs.ei.tum.de>.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/libexec/dma/dma.c,v 1.5 2008/09/30 17:47:21 swildner Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/queue.h>
  39 #include <sys/stat.h>
  40 #include <sys/types.h>
  41 #include <sys/wait.h>
  42
  43 #ifdef HAVE_CRYPTO
  44 #include <openssl/ssl.h>
  45 #endif /* HAVE_CRYPTO */
  46
  47 #include <dirent.h>
  48 #include <err.h>
  49 #include <errno.h>
  50 #include <fcntl.h>
  51 #include <inttypes.h>
  52 #include <netdb.h>
  53 #include <paths.h>
  54 #include <pwd.h>
  55 #include <signal.h>
  56 #include <stdarg.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <syslog.h>
  61 #include <unistd.h>
  62
  63 #include "dma.h"
  64
  65
  66
  67 static void deliver(struct qitem *);
  68 static int add_recp(struct queue *, const char *, const char *, int);
  69
  70 struct aliases aliases = LIST_HEAD_INITIALIZER(aliases);
  71 static struct strlist tmpfs = SLIST_HEAD_INITIALIZER(tmpfs);
  72 struct virtusers virtusers = LIST_HEAD_INITIALIZER(virtusers);
  73 struct authusers authusers = LIST_HEAD_INITIALIZER(authusers);
  74 static int daemonize = 1;
  75 struct config *config;
  76 static struct strlist seenmsg[16][16];
  77
  78
  79 char *
  80 hostname(void)
  81 {
  82         static char name[MAXHOSTNAMELEN+1];
  83
  84         if (gethostname(name, sizeof(name)) != 0)
  85                 strcpy(name, "(unknown hostname)");
  86
  87         return name;
  88 }
  89
  90 static char *
  91 set_from(const char *osender)
  92 {
  93         struct virtuser *v;
  94         char *sender;
  95
  96         if ((config->features & VIRTUAL) != 0) {
  97                 SLIST_FOREACH(v, &virtusers, next) {
  98                         if (strcmp(v->login, getlogin()) == 0) {
  99                                 sender = strdup(v->address);
 100                                 if (sender == NULL)
 101                                         return(NULL);
 102                                 goto out;
 103                         }
 104                 }
 105         }
 106
 107         if (osender) {
 108                 sender = strdup(osender);
 109                 if (sender == NULL)
 110                         return (NULL);
 111         } else {
 112                 if (asprintf(&sender, "%s@%s", getlogin(), hostname()) <= 0)
 113                         return (NULL);
 114         }
 115
 116         if (strchr(sender, '\n') != NULL) {
 117                 errno = EINVAL;
 118                 return (NULL);
 119         }
 120
 121 out:
 122         return (sender);
 123 }
 124
 125 static int
 126 read_aliases(void)
 127 {
 128         yyin = fopen(config->aliases, "r");
 129         if (yyin == NULL)
 130                 return (0);     /* not fatal */
 131         if (yyparse())
 132                 return (-1);    /* fatal error, probably malloc() */
 133         fclose(yyin);
 134         return (0);
 135 }
 136
 137 static int
 138 add_recp(struct queue *queue, const char *str, const char *sender, int expand)
 139 {
 140         struct qitem *it, *tit;
 141         struct stritem *sit;
 142         struct alias *al;
 143         struct passwd *pw;
 144         char *host;
 145         int aliased = 0;
 146
 147         it = calloc(1, sizeof(*it));
 148         if (it == NULL)
 149                 return (-1);
 150         it->addr = strdup(str);
 151         if (it->addr == NULL)
 152                 return (-1);
 153
 154         it->sender = sender;
 155         host = strrchr(it->addr, '@');
 156         if (host != NULL &&
 157             (strcmp(host + 1, hostname()) == 0 ||
 158              strcmp(host + 1, "localhost") == 0)) {
 159                 *host = 0;
 160         }
 161         LIST_FOREACH(tit, &queue->queue, next) {
 162                 /* weed out duplicate dests */
 163                 if (strcmp(tit->addr, it->addr) == 0) {
 164                         free(it->addr);
 165                         free(it);
 166                         return (0);
 167                 }
 168         }
 169         LIST_INSERT_HEAD(&queue->queue, it, next);
 170         if (strrchr(it->addr, '@') == NULL) {
 171                 it->remote = 0;
 172                 if (expand) {
 173                         LIST_FOREACH(al, &aliases, next) {
 174                                 if (strcmp(al->alias, it->addr) != 0)
 175                                         continue;
 176                                 SLIST_FOREACH(sit, &al->dests, next) {
 177                                         if (add_recp(queue, sit->str, sender, 1) != 0)
 178                                                 return (-1);
 179                                 }
 180                                 aliased = 1;
 181                         }
 182                         if (aliased) {
 183                                 LIST_REMOVE(it, next);
 184                         } else {
 185                                 /* Local destination, check */
 186                                 pw = getpwnam(it->addr);
 187                                 if (pw == NULL)
 188                                         goto out;
 189                                 endpwent();
 190                         }
 191                 }
 192         } else {
 193                 it->remote = 1;
 194         }
 195
 196         return (0);
 197
 198 out:
 199         free(it->addr);
 200         free(it);
 201         return (-1);
 202 }
 203
 204 static void
 205 deltmp(void)
 206 {
 207         struct stritem *t;
 208
 209         SLIST_FOREACH(t, &tmpfs, next) {
 210                 unlink(t->str);
 211         }
 212 }
 213
 214 static int
 215 gentempf(struct queue *queue)
 216 {
 217         char fn[PATH_MAX+1];
 218         struct stritem *t;
 219         int fd;
 220
 221         if (snprintf(fn, sizeof(fn), "%s/%s", config->spooldir, "tmp_XXXXXXXXXX") <= 0)
 222                 return (-1);
 223         fd = mkstemp(fn);
 224         if (fd < 0)
 225                 return (-1);
 226         queue->mailfd = fd;
 227         queue->tmpf = strdup(fn);
 228         if (queue->tmpf == NULL) {
 229                 unlink(fn);
 230                 return (-1);
 231         }
 232         t = malloc(sizeof(*t));
 233         if (t != NULL) {
 234                 t->str = queue->tmpf;
 235                 SLIST_INSERT_HEAD(&tmpfs, t, next);
 236         }
 237         return (0);
 238 }
 239
 240 static int
 241 open_locked(const char *fname, int flags)
 242 {
 243 #ifndef O_EXLOCK
 244         int fd, save_errno;
 245
 246         fd = open(fname, flags, 0);
 247         if (fd < 0)
 248                 return(fd);
 249         if (flock(fd, LOCK_EX|((flags & O_NONBLOCK)? LOCK_NB: 0)) < 0) {
 250                 save_errno = errno;
 251                 close(fd);
 252                 errno = save_errno;
 253                 return(-1);
 254         }
 255         return(fd);
 256 #else
 257         return(open(fname, flags|O_EXLOCK));
 258 #endif
 259 }
 260
 261 /*
 262  * spool file format:
 263  *
 264  * envelope-from
 265  * queue-id1 envelope-to1
 266  * queue-id2 envelope-to2
 267  * ...
 268  * <empty line>
 269  * mail data
 270  *
 271  * queue ids are unique, formed from the inode of the spool file
 272  * and a unique identifier.
 273  */
 274 static int
 275 preparespool(struct queue *queue, const char *sender)
 276 {
 277         char line[1000];        /* by RFC2822 */
 278         struct stat st;
 279         int error;
 280         struct qitem *it;
 281         FILE *queuef;
 282         off_t hdrlen;
 283
 284         error = snprintf(line, sizeof(line), "%s\n", sender);
 285         if (error < 0 || (size_t)error >= sizeof(line)) {
 286                 errno = E2BIG;
 287                 return (-1);
 288         }
 289         if (write(queue->mailfd, line, error) != error)
 290                 return (-1);
 291
 292         queuef = fdopen(queue->mailfd, "r+");
 293         if (queuef == NULL)
 294                 return (-1);
 295
 296         /*
 297          * Assign queue id to each dest.
 298          */
 299         if (fstat(queue->mailfd, &st) != 0)
 300                 return (-1);
 301         queue->id = st.st_ino;
 302         LIST_FOREACH(it, &queue->queue, next) {
 303                 if (asprintf(&it->queueid, "%"PRIxMAX".%"PRIxPTR,
 304                              queue->id, (uintptr_t)it) <= 0)
 305                         return (-1);
 306                 if (asprintf(&it->queuefn, "%s/%s",
 307                              config->spooldir, it->queueid) <= 0)
 308                         return (-1);
 309                 /* File may not exist yet */
 310                 if (stat(it->queuefn, &st) == 0)
 311                         return (-1);
 312                 it->queuef = queuef;
 313                 error = snprintf(line, sizeof(line), "%s %s\n",
 314                                it->queueid, it->addr);
 315                 if (error < 0 || (size_t)error >= sizeof(line))
 316                         return (-1);
 317                 if (write(queue->mailfd, line, error) != error)
 318                         return (-1);
 319         }
 320         line[0] = '\n';
 321         if (write(queue->mailfd, line, 1) != 1)
 322                 return (-1);
 323
 324         hdrlen = lseek(queue->mailfd, 0, SEEK_CUR);
 325         LIST_FOREACH(it, &queue->queue, next) {
 326                 it->hdrlen = hdrlen;
 327         }
 328         return (0);
 329 }
 330
 331 static char *
 332 rfc822date(void)
 333 {
 334         static char str[50];
 335         size_t error;
 336         time_t now;
 337
 338         now = time(NULL);
 339         error = strftime(str, sizeof(str), "%a, %d %b %Y %T %z",
 340                        localtime(&now));
 341         if (error == 0)
 342                 strcpy(str, "(date fail)");
 343         return (str);
 344 }
 345
 346 static int
 347 readmail(struct queue *queue, const char *sender, int nodot)
 348 {
 349         char line[1000];        /* by RFC2822 */
 350         size_t linelen;
 351         int error;
 352
 353         error = snprintf(line, sizeof(line), "\
 354 Received: from %s (uid %d)\n\
 355 \t(envelope-from %s)\n\
 356 \tid %"PRIxMAX"\n\
 357 \tby %s (%s)\n\
 358 \t%s\n",
 359                 getlogin(), getuid(),
 360                 sender,
 361                 queue->id,
 362                 hostname(), VERSION,
 363                 rfc822date());
 364         if (error < 0 || (size_t)error >= sizeof(line))
 365                 return (-1);
 366         if (write(queue->mailfd, line, error) != error)
 367                 return (-1);
 368
 369         while (!feof(stdin)) {
 370                 if (fgets(line, sizeof(line), stdin) == NULL)
 371                         break;
 372                 linelen = strlen(line);
 373                 if (linelen == 0 || line[linelen - 1] != '\n') {
 374                         errno = EINVAL;         /* XXX mark permanent errors */
 375                         return (-1);
 376                 }
 377                 if (!nodot && linelen == 2 && line[0] == '.')
 378                         break;
 379                 if ((size_t)write(queue->mailfd, line, linelen) != linelen)
 380                         return (-1);
 381         }
 382         if (fsync(queue->mailfd) != 0)
 383                 return (-1);
 384         return (0);
 385 }
 386
 387 static int
 388 linkspool(struct queue *queue)
 389 {
 390         struct qitem *it;
 391
 392         LIST_FOREACH(it, &queue->queue, next) {
 393                 if (link(queue->tmpf, it->queuefn) != 0)
 394                         goto delfiles;
 395         }
 396         unlink(queue->tmpf);
 397         return (0);
 398
 399 delfiles:
 400         LIST_FOREACH(it, &queue->queue, next) {
 401                 unlink(it->queuefn);
 402         }
 403         return (-1);
 404 }
 405
 406 static struct qitem *
 407 go_background(struct queue *queue)
 408 {
 409         struct sigaction sa;
 410         struct qitem *it;
 411         pid_t pid;
 412
 413         if (daemonize && daemon(0, 0) != 0) {
 414                 syslog(LOG_ERR, "can not daemonize: %m");
 415                 exit(1);
 416         }
 417         daemonize = 0;
 418
 419         bzero(&sa, sizeof(sa));
 420         sa.sa_flags = SA_NOCLDWAIT;
 421         sa.sa_handler = SIG_IGN;
 422         sigaction(SIGCHLD, &sa, NULL);
 423
 424         LIST_FOREACH(it, &queue->queue, next) {
 425                 /* No need to fork for the last dest */
 426                 if (LIST_NEXT(it, next) == NULL)
 427                         return (it);
 428
 429                 pid = fork();
 430                 switch (pid) {
 431                 case -1:
 432                         syslog(LOG_ERR, "can not fork: %m");
 433                         exit(1);
 434                         break;
 435
 436                 case 0:
 437                         /*
 438                          * Child:
 439                          *
 440                          * return and deliver mail
 441                          */
 442                         return (it);
 443
 444                 default:
 445                         /*
 446                          * Parent:
 447                          *
 448                          * fork next child
 449                          */
 450                         break;
 451                 }
 452         }
 453
 454         syslog(LOG_CRIT, "reached dead code");
 455         exit(1);
 456 }
 457
 458 static void
 459 bounce(struct qitem *it, const char *reason)
 460 {
 461         struct queue bounceq;
 462         struct qitem *bit;
 463         char line[1000];
 464         int error;
 465
 466         /* Don't bounce bounced mails */
 467         if (it->sender[0] == 0) {
 468                 syslog(LOG_CRIT, "%s: delivery panic: can't bounce a bounce",
 469                        it->queueid);
 470                 exit(1);
 471         }
 472
 473         syslog(LOG_ERR, "%s: delivery failed, bouncing",
 474                it->queueid);
 475
 476         LIST_INIT(&bounceq.queue);
 477         if (add_recp(&bounceq, it->sender, "", 1) != 0)
 478                 goto fail;
 479         if (gentempf(&bounceq) != 0)
 480                 goto fail;
 481         if (preparespool(&bounceq, "") != 0)
 482                 goto fail;
 483
 484         bit = LIST_FIRST(&bounceq.queue);
 485         error = fprintf(bit->queuef, "\
 486 Received: from MAILER-DAEMON\n\
 487 \tid %"PRIxMAX"\n\
 488 \tby %s (%s)\n\
 489 \t%s\n\
 490 X-Original-To: <%s>\n\
 491 From: MAILER-DAEMON <>\n\
 492 To: %s\n\
 493 Subject: Mail delivery failed\n\
 494 Message-Id: <%"PRIxMAX"@%s>\n\
 495 Date: %s\n\
 496 \n\
 497 This is the %s at %s.\n\
 498 \n\
 499 There was an error delivering your mail to <%s>.\n\
 500 \n\
 501 %s\n\
 502 \n\
 503 Message headers follow.\n\
 504 \n\
 505 ",
 506                 bounceq.id,
 507                 hostname(), VERSION,
 508                 rfc822date(),
 509                 it->addr,
 510                 it->sender,
 511                 bounceq.id, hostname(),
 512                 rfc822date(),
 513                 VERSION, hostname(),
 514                 it->addr,
 515                 reason);
 516         if (error < 0)
 517                 goto fail;
 518         if (fflush(bit->queuef) != 0)
 519                 goto fail;
 520
 521         if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0)
 522                 goto fail;
 523         while (!feof(it->queuef)) {
 524                 if (fgets(line, sizeof(line), it->queuef) == NULL)
 525                         break;
 526                 if (line[0] == '\n')
 527                         break;
 528                 write(bounceq.mailfd, line, strlen(line));
 529         }
 530         if (fsync(bounceq.mailfd) != 0)
 531                 goto fail;
 532         if (linkspool(&bounceq) != 0)
 533                 goto fail;
 534         /* bounce is safe */
 535
 536         unlink(it->queuefn);
 537         fclose(it->queuef);
 538
 539         bit = go_background(&bounceq);
 540         deliver(bit);
 541         /* NOTREACHED */
 542
 543 fail:
 544         syslog(LOG_CRIT, "%s: error creating bounce: %m", it->queueid);
 545         unlink(it->queuefn);
 546         exit(1);
 547 }
 548
 549 static int
 550 deliver_local(struct qitem *it, const char **errmsg)
 551 {
 552         char fn[PATH_MAX+1];
 553         char line[1000];
 554         size_t linelen;
 555         int mbox;
 556         int error;
 557         off_t mboxlen;
 558         time_t now = time(NULL);
 559
 560         error = snprintf(fn, sizeof(fn), "%s/%s", _PATH_MAILDIR, it->addr);
 561         if (error < 0 || (size_t)error >= sizeof(fn)) {
 562                 syslog(LOG_ERR, "%s: local delivery deferred: %m",
 563                        it->queueid);
 564                 return (1);
 565         }
 566
 567         /* mailx removes users mailspool file if empty, so open with O_CREAT */
 568         mbox = open_locked(fn, O_WRONLY | O_APPEND | O_CREAT);
 569         if (mbox < 0) {
 570                 syslog(LOG_ERR, "%s: local delivery deferred: can not open `%s': %m",
 571                        it->queueid, fn);
 572                 return (1);
 573         }
 574         mboxlen = lseek(mbox, 0, SEEK_CUR);
 575
 576         if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0) {
 577                 syslog(LOG_ERR, "%s: local delivery deferred: can not seek: %m",
 578                        it->queueid);
 579                 return (1);
 580         }
 581
 582         error = snprintf(line, sizeof(line), "From %s\t%s", it->sender, ctime(&now));
 583         if (error < 0 || (size_t)error >= sizeof(line)) {
 584                 syslog(LOG_ERR, "%s: local delivery deferred: can not write header: %m",
 585                        it->queueid);
 586                 return (1);
 587         }
 588         if (write(mbox, line, error) != error)
 589                 goto wrerror;
 590
 591         while (!feof(it->queuef)) {
 592                 if (fgets(line, sizeof(line), it->queuef) == NULL)
 593                         break;
 594                 linelen = strlen(line);
 595                 if (linelen == 0 || line[linelen - 1] != '\n') {
 596                         syslog(LOG_CRIT, "%s: local delivery failed: corrupted queue file",
 597                                it->queueid);
 598                         *errmsg = "corrupted queue file";
 599                         error = -1;
 600                         goto chop;
 601                 }
 602
 603                 if (strncmp(line, "From ", 5) == 0) {
 604                         const char *gt = ">";
 605
 606                         if (write(mbox, gt, 1) != 1)
 607                                 goto wrerror;
 608                 }
 609                 if ((size_t)write(mbox, line, linelen) != linelen)
 610                         goto wrerror;
 611         }
 612         line[0] = '\n';
 613         if (write(mbox, line, 1) != 1)
 614                 goto wrerror;
 615         close(mbox);
 616         return (0);
 617
 618 wrerror:
 619         syslog(LOG_ERR, "%s: local delivery failed: write error: %m",
 620                it->queueid);
 621         error = 1;
 622 chop:
 623         if (ftruncate(mbox, mboxlen) != 0)
 624                 syslog(LOG_WARNING, "%s: error recovering mbox `%s': %m",
 625                        it->queueid, fn);
 626         close(mbox);
 627         return (error);
 628 }
 629
 630 static void
 631 deliver(struct qitem *it)
 632 {
 633         int error;
 634         unsigned int backoff = MIN_RETRY;
 635         const char *errmsg = "unknown bounce reason";
 636         struct timeval now;
 637         struct stat st;
 638
 639         syslog(LOG_INFO, "%s: mail from=<%s> to=<%s>",
 640                it->queueid, it->sender, it->addr);
 641
 642 retry:
 643         syslog(LOG_INFO, "%s: trying delivery",
 644                it->queueid);
 645
 646         if (it->remote)
 647                 error = deliver_remote(it, &errmsg);
 648         else
 649                 error = deliver_local(it, &errmsg);
 650
 651         switch (error) {
 652         case 0:
 653                 unlink(it->queuefn);
 654                 syslog(LOG_INFO, "%s: delivery successful",
 655                        it->queueid);
 656                 exit(0);
 657
 658         case 1:
 659                 if (stat(it->queuefn, &st) != 0) {
 660                         syslog(LOG_ERR, "%s: lost queue file `%s'",
 661                                it->queueid, it->queuefn);
 662                         exit(1);
 663                 }
 664                 if (gettimeofday(&now, NULL) == 0 &&
 665                     (now.tv_sec - st.st_mtimespec.tv_sec > MAX_TIMEOUT)) {
 666                         char *msg;
 667
 668                         if (asprintf(&msg,
 669                                  "Could not deliver for the last %d seconds. Giving up.",
 670                                  MAX_TIMEOUT) > 0)
 671                                 errmsg = msg;
 672                         goto bounce;
 673                 }
 674                 sleep(backoff);
 675                 backoff *= 2;
 676                 if (backoff > MAX_RETRY)
 677                         backoff = MAX_RETRY;
 678                 goto retry;
 679
 680         case -1:
 681         default:
 682                 break;
 683         }
 684
 685 bounce:
 686         bounce(it, errmsg);
 687         /* NOTREACHED */
 688 }
 689
 690 static int
 691 c2x(char c)
 692 {
 693         if (c <= '9')
 694                 return (c - '0');
 695         else if (c <= 'F')
 696                 return (c - 'A' + 10);
 697         else
 698                 return (c - 'a' + 10);
 699 }
 700
 701 static void
 702 seen_init(void)
 703 {
 704         int i, j;
 705
 706         for (i = 0; i < 16; i++)
 707                 for (j = 0; j < 16; j++)
 708                         SLIST_INIT(&seenmsg[i][j]);
 709 }
 710
 711 static int
 712 seen(const char *msgid)
 713 {
 714         const char *p;
 715         size_t len;
 716         int i, j;
 717         struct stritem *t;
 718
 719         p = strchr(msgid, '.');
 720         if (p == NULL)
 721                 return (0);
 722         len = p - msgid;
 723         if (len >= 2) {
 724                 i = c2x(msgid[len - 2]);
 725                 j = c2x(msgid[len - 1]);
 726         } else if (len == 1) {
 727                 i = c2x(msgid[0]);
 728                 j = 0;
 729         } else {
 730                 i = j = 0;
 731         }
 732         if (i < 0 || i >= 16 || j < 0 || j >= 16)
 733                 errx(1, "INTERNAL ERROR: bad seen code for msgid %s", msgid);
 734         SLIST_FOREACH(t, &seenmsg[i][j], next)
 735                 if (!strncmp(t->str, msgid, len))
 736                         return (1);
 737         t = malloc(sizeof(*t));
 738         if (t == NULL)
 739                 errx(1, "Could not allocate %lu bytes",
 740                     (unsigned long)(sizeof(*t)));
 741         t->str = strdup(msgid);
 742         if (t->str == NULL)
 743                 errx(1, "Could not duplicate msgid %s", msgid);
 744         SLIST_INSERT_HEAD(&seenmsg[i][j], t, next);
 745         return (0);
 746 }
 747
 748 static void
 749 load_queue(struct queue *queue, int ignorelock)
 750 {
 751         struct stat st;
 752         struct qitem *it;
 753         //struct queue queue, itmqueue;
 754         struct queue itmqueue;
 755         DIR *spooldir;
 756         struct dirent *de;
 757         char line[1000];
 758         char *fn;
 759         FILE *queuef;
 760         char *sender;
 761         char *addr;
 762         char *queueid;
 763         char *queuefn;
 764         off_t hdrlen;
 765         int fd, locked, seenit;
 766
 767         LIST_INIT(&queue->queue);
 768
 769         spooldir = opendir(config->spooldir);
 770         if (spooldir == NULL)
 771                 err(1, "reading queue");
 772
 773         seen_init();
 774         while ((de = readdir(spooldir)) != NULL) {
 775                 sender = NULL;
 776                 queuef = NULL;
 777                 queueid = NULL;
 778                 queuefn = NULL;
 779                 fn = NULL;
 780                 LIST_INIT(&itmqueue.queue);
 781
 782                 /* ignore temp files */
 783                 if (strncmp(de->d_name, "tmp_", 4) == 0 ||
 784                     de->d_type != DT_REG)
 785                         continue;
 786                 if (asprintf(&queuefn, "%s/%s", config->spooldir, de->d_name) < 0)
 787                         goto fail;
 788                 seenit = seen(de->d_name);
 789                 locked = 0;
 790                 fd = open_locked(queuefn, O_RDONLY|O_NONBLOCK);
 791                 if (fd < 0) {
 792                         /* Ignore locked files */
 793                         if (errno != EWOULDBLOCK)
 794                                 goto skip_item;
 795                         if (!ignorelock || seenit)
 796                                 continue;
 797                         fd = open(queuefn, O_RDONLY);
 798                         if (fd < 0)
 799                                 goto skip_item;
 800                         locked = 1;
 801                 }
 802
 803                 queuef = fdopen(fd, "r");
 804                 if (queuef == NULL)
 805                         goto skip_item;
 806                 if (fgets(line, sizeof(line), queuef) == NULL ||
 807                     line[0] == 0)
 808                         goto skip_item;
 809                 line[strlen(line) - 1] = 0;     /* chop newline */
 810                 sender = strdup(line);
 811                 if (sender == NULL)
 812                         goto skip_item;
 813
 814                 for (;;) {
 815                         if (fgets(line, sizeof(line), queuef) == NULL ||
 816                             line[0] == 0)
 817                                 goto skip_item;
 818                         if (line[0] == '\n')
 819                                 break;
 820                         line[strlen(line) - 1] = 0;
 821                         queueid = strdup(line);
 822                         if (queueid == NULL)
 823                                 goto skip_item;
 824                         addr = strchr(queueid, ' ');
 825                         if (addr == NULL)
 826                                 goto skip_item;
 827                         *addr++ = 0;
 828                         if (fn != NULL)
 829                                 free(fn);
 830                         if (asprintf(&fn, "%s/%s", config->spooldir, queueid) < 0)
 831                                 goto skip_item;
 832                         /* Item has already been delivered? */
 833                         if (stat(fn, &st) != 0)
 834                                 continue;
 835                         if (add_recp(&itmqueue, addr, sender, 0) != 0)
 836                                 goto skip_item;
 837                         it = LIST_FIRST(&itmqueue.queue);
 838                         it->queuef = queuef;
 839                         it->queueid = queueid;
 840                         it->queuefn = fn;
 841                         it->locked = locked;
 842                         fn = NULL;
 843                 }
 844                 if (LIST_EMPTY(&itmqueue.queue)) {
 845                         warnx("queue file without items: `%s'", queuefn);
 846                         goto skip_item2;
 847                 }
 848                 hdrlen = ftell(queuef);
 849                 while ((it = LIST_FIRST(&itmqueue.queue)) != NULL) {
 850                         it->hdrlen = hdrlen;
 851                         LIST_REMOVE(it, next);
 852                         LIST_INSERT_HEAD(&queue->queue, it, next);
 853                 }
 854                 continue;
 855
 856 skip_item:
 857                 warn("reading queue: `%s'", queuefn);
 858 skip_item2:
 859                 if (sender != NULL)
 860                         free(sender);
 861                 if (queuefn != NULL)
 862                         free(queuefn);
 863                 if (fn != NULL)
 864                         free(fn);
 865                 if (queueid != NULL)
 866                         free(queueid);
 867                 close(fd);
 868         }
 869         closedir(spooldir);
 870         return;
 871
 872 fail:
 873         err(1, "reading queue");
 874 }
 875
 876 static void
 877 run_queue(struct queue *queue)
 878 {
 879         struct qitem *it;
 880
 881         if (LIST_EMPTY(&queue->queue))
 882                 return;
 883
 884         it = go_background(queue);
 885         deliver(it);
 886         /* NOTREACHED */
 887 }
 888
 889 static void
 890 show_queue(struct queue *queue)
 891 {
 892         struct qitem *it;
 893
 894         if (LIST_EMPTY(&queue->queue)) {
 895                 printf("Mail queue is empty\n");
 896                 return;
 897         }
 898
 899         LIST_FOREACH(it, &queue->queue, next) {
 900                 printf("\
 901 ID\t: %s%s\n\
 902 From\t: %s\n\
 903 To\t: %s\n--\n", it->queueid, it->locked? "*": "", it->sender, it->addr);
 904         }
 905 }
 906
 907 /*
 908  * TODO:
 909  *
 910  * - alias processing
 911  * - use group permissions
 912  * - proper sysexit codes
 913  */
 914
 915 int
 916 main(int argc, char **argv)
 917 {
 918         char *sender = NULL;
 919         char tag[255];
 920         struct qitem *it;
 921         struct queue queue;
 922         struct queue lqueue;
 923         int i, ch;
 924         int nodot = 0, doqueue = 0, showq = 0;
 925
 926         atexit(deltmp);
 927         LIST_INIT(&queue.queue);
 928         snprintf(tag, 254, "dma");
 929
 930         opterr = 0;
 931         while ((ch = getopt(argc, argv, "A:b:Df:iL:o:O:q:r:")) != -1) {
 932                 switch (ch) {
 933                 case 'A':
 934                         /* -AX is being ignored, except for -A{c,m} */
 935                         if (optarg[0] == 'c' || optarg[0] == 'm') {
 936                                 break;
 937                         }
 938                         /* else FALLTRHOUGH */
 939                 case 'b':
 940                         /* -bX is being ignored, except for -bp */
 941                         if (optarg[0] == 'p') {
 942                                 showq = 1;
 943                                 break;
 944                         }
 945                         /* else FALLTRHOUGH */
 946                 case 'D':
 947                         daemonize = 0;
 948                         break;
 949                 case 'L':
 950                         if (optarg != NULL)
 951                                 snprintf(tag, 254, "%s", optarg);
 952                         break;
 953                 case 'f':
 954                 case 'r':
 955                         sender = optarg;
 956                         break;
 957
 958                 case 'o':
 959                         /* -oX is being ignored, except for -oi */
 960                         if (optarg[0] != 'i')
 961                                 break;
 962                         /* else FALLTRHOUGH */
 963                 case 'O':
 964                         break;
 965                 case 'i':
 966                         nodot = 1;
 967                         break;
 968
 969                 case 'q':
 970                         doqueue = 1;
 971                         break;
 972
 973                 default:
 974                         exit(1);
 975                 }
 976         }
 977         argc -= optind;
 978         argv += optind;
 979         opterr = 1;
 980
 981         openlog(tag, LOG_PID | LOG_PERROR, LOG_MAIL);
 982
 983         config = malloc(sizeof(struct config));
 984         if (config == NULL)
 985                 errx(1, "Cannot allocate enough memory");
 986
 987         memset(config, 0, sizeof(struct config));
 988         if (parse_conf(CONF_PATH, config) < 0) {
 989                 free(config);
 990                 errx(1, "reading config file");
 991         }
 992
 993         if (config->features & VIRTUAL)
 994                 if (parse_virtuser(config->virtualpath) < 0)
 995                         errx(1, "error reading virtual user file: %s",
 996                                 config->virtualpath);
 997
 998         if (parse_authfile(config->authpath) < 0)
 999                 err(1, "reading SMTP authentication file");
1000
1001         if (showq) {
1002                 if (argc != 0)
1003                         errx(1, "sending mail and displaying queue is"
1004                                 " mutually exclusive");
1005                 load_queue(&lqueue, 1);
1006                 show_queue(&lqueue);
1007                 return (0);
1008         }
1009
1010         if (doqueue) {
1011                 if (argc != 0)
1012                         errx(1, "sending mail and queue pickup is mutually exclusive");
1013                 load_queue(&lqueue, 0);
1014                 run_queue(&lqueue);
1015                 return (0);
1016         }
1017
1018         if (read_aliases() != 0)
1019                 err(1, "reading aliases");
1020
1021         if ((sender = set_from(sender)) == NULL)
1022                 err(1, "setting from address");
1023
1024         for (i = 0; i < argc; i++) {
1025                 if (add_recp(&queue, argv[i], sender, 1) != 0)
1026                         errx(1, "invalid recipient `%s'\n", argv[i]);
1027         }
1028
1029         if (LIST_EMPTY(&queue.queue))
1030                 errx(1, "no recipients");
1031
1032         if (gentempf(&queue) != 0)
1033                 err(1, "create temp file");
1034
1035         if (preparespool(&queue, sender) != 0)
1036                 err(1, "creating spools (1)");
1037
1038         if (readmail(&queue, sender, nodot) != 0)
1039                 err(1, "reading mail");
1040
1041         if (linkspool(&queue) != 0)
1042                 err(1, "creating spools (2)");
1043
1044         /* From here on the mail is safe. */
1045
1046         if (config->features & DEFER)
1047                 return (0);
1048
1049         it = go_background(&queue);
1050         deliver(it);
1051
1052         /* NOTREACHED */
1053         return (0);
1054 }