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 const char *username;
  77 static uid_t uid;
  78 static struct strlist seenmsg[16][16];
  79
  80
  81 char *
  82 hostname(void)
  83 {
  84         static char name[MAXHOSTNAMELEN+1];
  85         int initialized = 0;
  86         FILE *fp;
  87         size_t len;
  88
  89         if (initialized)
  90                 return (name);
  91
  92         if (config->mailname != NULL && config->mailname[0] != '\0') {
  93                 snprintf(name, sizeof(name), "%s", config->mailname);
  94                 initialized = 1;
  95                 return (name);
  96         }
  97         if (config->mailnamefile != NULL && config->mailnamefile[0] != '\0') {
  98                 fp = fopen(config->mailnamefile, "r");
  99                 if (fp != NULL) {
 100                         if (fgets(name, sizeof(name), fp) != NULL) {
 101                                 len = strlen(name);
 102                                 while (len > 0 &&
 103                                     (name[len - 1] == '\r' ||
 104                                      name[len - 1] == '\n'))
 105                                         name[--len] = '\0';
 106                                 if (name[0] != '\0') {
 107                                         initialized = 1;
 108                                         return (name);
 109                                 }
 110                         }
 111                         fclose(fp);
 112                 }
 113         }
 114         if (gethostname(name, sizeof(name)) != 0)
 115                 strcpy(name, "(unknown hostname)");
 116         initialized = 1;
 117         return name;
 118 }
 119
 120 static const char *
 121 check_username(const char *name, uid_t ckuid)
 122 {
 123         struct passwd *pwd;
 124
 125         if (name == NULL)
 126                 return (NULL);
 127         pwd = getpwnam(name);
 128         if (pwd == NULL || pwd->pw_uid != ckuid)
 129                 return (NULL);
 130         return (name);
 131 }
 132
 133 static void
 134 set_username(void)
 135 {
 136         struct passwd *pwd;
 137         char *u;
 138
 139         uid = getuid();
 140         username = check_username(getlogin(), uid);
 141         if (username == NULL)
 142                 username = check_username(getenv("LOGNAME"), uid);
 143         if (username == NULL)
 144                 username = check_username(getenv("USER"), uid);
 145         if (username == NULL) {
 146                 pwd = getpwuid(uid);
 147                 if (pwd != NULL && pwd->pw_name != NULL &&
 148                     pwd->pw_name[0] != '\0')
 149                         username = check_username(strdup(pwd->pw_name), uid);
 150         }
 151         if (username == NULL) {
 152                 asprintf(&u, "%ld", (long)uid);
 153                 username = u;
 154         }
 155         if (username == NULL)
 156                 username = "unknown-or-invalid-username";
 157 }
 158
 159 static char *
 160 set_from(const char *osender)
 161 {
 162         struct virtuser *v;
 163         char *sender;
 164
 165         if ((config->features & VIRTUAL) != 0) {
 166                 SLIST_FOREACH(v, &virtusers, next) {
 167                         if (strcmp(v->login, username) == 0) {
 168                                 sender = strdup(v->address);
 169                                 if (sender == NULL)
 170                                         return(NULL);
 171                                 goto out;
 172                         }
 173                 }
 174         }
 175
 176         if (osender) {
 177                 sender = strdup(osender);
 178                 if (sender == NULL)
 179                         return (NULL);
 180         } else {
 181                 if (asprintf(&sender, "%s@%s", username, hostname()) <= 0)
 182                         return (NULL);
 183         }
 184
 185         if (strchr(sender, '\n') != NULL) {
 186                 errno = EINVAL;
 187                 return (NULL);
 188         }
 189
 190 out:
 191         return (sender);
 192 }
 193
 194 static int
 195 read_aliases(void)
 196 {
 197         yyin = fopen(config->aliases, "r");
 198         if (yyin == NULL)
 199                 return (0);     /* not fatal */
 200         if (yyparse())
 201                 return (-1);    /* fatal error, probably malloc() */
 202         fclose(yyin);
 203         return (0);
 204 }
 205
 206 static int
 207 add_recp(struct queue *queue, const char *str, const char *sender, int expand)
 208 {
 209         struct qitem *it, *tit;
 210         struct stritem *sit;
 211         struct alias *al;
 212         struct passwd *pw;
 213         char *host;
 214         int aliased = 0;
 215
 216         it = calloc(1, sizeof(*it));
 217         if (it == NULL)
 218                 return (-1);
 219         it->addr = strdup(str);
 220         if (it->addr == NULL)
 221                 return (-1);
 222
 223         it->sender = sender;
 224         host = strrchr(it->addr, '@');
 225         if (host != NULL &&
 226             (strcmp(host + 1, hostname()) == 0 ||
 227              strcmp(host + 1, "localhost") == 0)) {
 228                 *host = 0;
 229         }
 230         LIST_FOREACH(tit, &queue->queue, next) {
 231                 /* weed out duplicate dests */
 232                 if (strcmp(tit->addr, it->addr) == 0) {
 233                         free(it->addr);
 234                         free(it);
 235                         return (0);
 236                 }
 237         }
 238         LIST_INSERT_HEAD(&queue->queue, it, next);
 239         if (strrchr(it->addr, '@') == NULL) {
 240                 it->remote = 0;
 241                 if (expand) {
 242                         LIST_FOREACH(al, &aliases, next) {
 243                                 if (strcmp(al->alias, it->addr) != 0)
 244                                         continue;
 245                                 SLIST_FOREACH(sit, &al->dests, next) {
 246                                         if (add_recp(queue, sit->str, sender, 1) != 0)
 247                                                 return (-1);
 248                                 }
 249                                 aliased = 1;
 250                         }
 251                         if (aliased) {
 252                                 LIST_REMOVE(it, next);
 253                         } else {
 254                                 /* Local destination, check */
 255                                 pw = getpwnam(it->addr);
 256                                 if (pw == NULL)
 257                                         goto out;
 258                                 endpwent();
 259                         }
 260                 }
 261         } else {
 262                 it->remote = 1;
 263         }
 264
 265         return (0);
 266
 267 out:
 268         free(it->addr);
 269         free(it);
 270         return (-1);
 271 }
 272
 273 static void
 274 deltmp(void)
 275 {
 276         struct stritem *t;
 277
 278         SLIST_FOREACH(t, &tmpfs, next) {
 279                 unlink(t->str);
 280         }
 281 }
 282
 283 static int
 284 gentempf(struct queue *queue)
 285 {
 286         char fn[PATH_MAX+1];
 287         struct stritem *t;
 288         int fd;
 289
 290         if (snprintf(fn, sizeof(fn), "%s/%s", config->spooldir, "tmp_XXXXXXXXXX") <= 0)
 291                 return (-1);
 292         fd = mkstemp(fn);
 293         if (fd < 0)
 294                 return (-1);
 295         if (flock(fd, LOCK_EX) == -1)
 296                 return (-1);
 297         queue->mailfd = fd;
 298         queue->tmpf = strdup(fn);
 299         if (queue->tmpf == NULL) {
 300                 unlink(fn);
 301                 return (-1);
 302         }
 303         t = malloc(sizeof(*t));
 304         if (t != NULL) {
 305                 t->str = queue->tmpf;
 306                 SLIST_INSERT_HEAD(&tmpfs, t, next);
 307         }
 308         return (0);
 309 }
 310
 311 static int
 312 open_locked(const char *fname, int flags)
 313 {
 314 #ifndef O_EXLOCK
 315         int fd, save_errno;
 316
 317         fd = open(fname, flags, 0);
 318         if (fd < 0)
 319                 return(fd);
 320         if (flock(fd, LOCK_EX|((flags & O_NONBLOCK)? LOCK_NB: 0)) < 0) {
 321                 save_errno = errno;
 322                 close(fd);
 323                 errno = save_errno;
 324                 return(-1);
 325         }
 326         return(fd);
 327 #else
 328         return(open(fname, flags|O_EXLOCK));
 329 #endif
 330 }
 331
 332 /*
 333  * spool file format:
 334  *
 335  * envelope-from
 336  * queue-id1 envelope-to1
 337  * queue-id2 envelope-to2
 338  * ...
 339  * <empty line>
 340  * mail data
 341  *
 342  * queue ids are unique, formed from the inode of the spool file
 343  * and a unique identifier.
 344  */
 345 static int
 346 preparespool(struct queue *queue, const char *sender)
 347 {
 348         char line[1000];        /* by RFC2822 */
 349         struct stat st;
 350         int error;
 351         struct qitem *it;
 352         FILE *queuef;
 353         off_t hdrlen;
 354
 355         error = snprintf(line, sizeof(line), "%s\n", sender);
 356         if (error < 0 || (size_t)error >= sizeof(line)) {
 357                 errno = E2BIG;
 358                 return (-1);
 359         }
 360         if (write(queue->mailfd, line, error) != error)
 361                 return (-1);
 362
 363         queuef = fdopen(queue->mailfd, "r+");
 364         if (queuef == NULL)
 365                 return (-1);
 366
 367         /*
 368          * Assign queue id to each dest.
 369          */
 370         if (fstat(queue->mailfd, &st) != 0)
 371                 return (-1);
 372         queue->id = st.st_ino;
 373         LIST_FOREACH(it, &queue->queue, next) {
 374                 if (asprintf(&it->queueid, "%"PRIxMAX".%"PRIxPTR,
 375                              queue->id, (uintptr_t)it) <= 0)
 376                         return (-1);
 377                 if (asprintf(&it->queuefn, "%s/%s",
 378                              config->spooldir, it->queueid) <= 0)
 379                         return (-1);
 380                 /* File may not exist yet */
 381                 if (stat(it->queuefn, &st) == 0)
 382                         return (-1);
 383                 it->queuef = queuef;
 384                 error = snprintf(line, sizeof(line), "%s %s\n",
 385                                it->queueid, it->addr);
 386                 if (error < 0 || (size_t)error >= sizeof(line))
 387                         return (-1);
 388                 if (write(queue->mailfd, line, error) != error)
 389                         return (-1);
 390         }
 391         line[0] = '\n';
 392         if (write(queue->mailfd, line, 1) != 1)
 393                 return (-1);
 394
 395         hdrlen = lseek(queue->mailfd, 0, SEEK_CUR);
 396         LIST_FOREACH(it, &queue->queue, next) {
 397                 it->hdrlen = hdrlen;
 398         }
 399         return (0);
 400 }
 401
 402 static char *
 403 rfc822date(void)
 404 {
 405         static char str[50];
 406         size_t error;
 407         time_t now;
 408
 409         now = time(NULL);
 410         error = strftime(str, sizeof(str), "%a, %d %b %Y %T %z",
 411                        localtime(&now));
 412         if (error == 0)
 413                 strcpy(str, "(date fail)");
 414         return (str);
 415 }
 416
 417 static int
 418 readmail(struct queue *queue, const char *sender, int nodot)
 419 {
 420         char line[1000];        /* by RFC2822 */
 421         size_t linelen;
 422         int error;
 423
 424         error = snprintf(line, sizeof(line), "\
 425 Received: from %s (uid %d)\n\
 426 \t(envelope-from %s)\n\
 427 \tid %"PRIxMAX"\n\
 428 \tby %s (%s)\n\
 429 \t%s\n",
 430                 username, uid,
 431                 sender,
 432                 queue->id,
 433                 hostname(), VERSION,
 434                 rfc822date());
 435         if (error < 0 || (size_t)error >= sizeof(line))
 436                 return (-1);
 437         if (write(queue->mailfd, line, error) != error)
 438                 return (-1);
 439
 440         while (!feof(stdin)) {
 441                 if (fgets(line, sizeof(line), stdin) == NULL)
 442                         break;
 443                 linelen = strlen(line);
 444                 if (linelen == 0 || line[linelen - 1] != '\n') {
 445                         errno = EINVAL;         /* XXX mark permanent errors */
 446                         return (-1);
 447                 }
 448                 if (!nodot && linelen == 2 && line[0] == '.')
 449                         break;
 450                 if ((size_t)write(queue->mailfd, line, linelen) != linelen)
 451                         return (-1);
 452         }
 453         if (fsync(queue->mailfd) != 0)
 454                 return (-1);
 455         return (0);
 456 }
 457
 458 static int
 459 linkspool(struct queue *queue)
 460 {
 461         struct qitem *it;
 462
 463         LIST_FOREACH(it, &queue->queue, next) {
 464                 if (link(queue->tmpf, it->queuefn) != 0)
 465                         goto delfiles;
 466         }
 467         unlink(queue->tmpf);
 468         return (0);
 469
 470 delfiles:
 471         LIST_FOREACH(it, &queue->queue, next) {
 472                 unlink(it->queuefn);
 473         }
 474         return (-1);
 475 }
 476
 477 static struct qitem *
 478 go_background(struct queue *queue)
 479 {
 480         struct sigaction sa;
 481         struct qitem *it;
 482         pid_t pid;
 483
 484         if (daemonize && daemon(0, 0) != 0) {
 485                 syslog(LOG_ERR, "can not daemonize: %m");
 486                 exit(1);
 487         }
 488         daemonize = 0;
 489
 490         bzero(&sa, sizeof(sa));
 491         sa.sa_flags = SA_NOCLDWAIT;
 492         sa.sa_handler = SIG_IGN;
 493         sigaction(SIGCHLD, &sa, NULL);
 494
 495         LIST_FOREACH(it, &queue->queue, next) {
 496                 /* No need to fork for the last dest */
 497                 if (LIST_NEXT(it, next) == NULL)
 498                         return (it);
 499
 500                 pid = fork();
 501                 switch (pid) {
 502                 case -1:
 503                         syslog(LOG_ERR, "can not fork: %m");
 504                         exit(1);
 505                         break;
 506
 507                 case 0:
 508                         /*
 509                          * Child:
 510                          *
 511                          * return and deliver mail
 512                          */
 513                         return (it);
 514
 515                 default:
 516                         /*
 517                          * Parent:
 518                          *
 519                          * fork next child
 520                          */
 521                         break;
 522                 }
 523         }
 524
 525         syslog(LOG_CRIT, "reached dead code");
 526         exit(1);
 527 }
 528
 529 static void
 530 bounce(struct qitem *it, char *reason)
 531 {
 532         struct queue bounceq;
 533         struct qitem *bit;
 534         char line[1000];
 535         size_t pos;
 536         int error;
 537
 538         /* Don't bounce bounced mails */
 539         if (it->sender[0] == 0) {
 540                 syslog(LOG_CRIT, "%s: delivery panic: can't bounce a bounce",
 541                        it->queueid);
 542                 exit(1);
 543         }
 544
 545         syslog(LOG_ERR, "%s: delivery failed, bouncing",
 546                it->queueid);
 547
 548         LIST_INIT(&bounceq.queue);
 549         if (add_recp(&bounceq, it->sender, "", 1) != 0)
 550                 goto fail;
 551         if (gentempf(&bounceq) != 0)
 552                 goto fail;
 553         if (preparespool(&bounceq, "") != 0)
 554                 goto fail;
 555
 556         bit = LIST_FIRST(&bounceq.queue);
 557         error = fprintf(bit->queuef, "\
 558 Received: from MAILER-DAEMON\n\
 559 \tid %"PRIxMAX"\n\
 560 \tby %s (%s)\n\
 561 \t%s\n\
 562 X-Original-To: <%s>\n\
 563 From: MAILER-DAEMON <>\n\
 564 To: %s\n\
 565 Subject: Mail delivery failed\n\
 566 Message-Id: <%"PRIxMAX"@%s>\n\
 567 Date: %s\n\
 568 \n\
 569 This is the %s at %s.\n\
 570 \n\
 571 There was an error delivering your mail to <%s>.\n\
 572 \n\
 573 %s\n\
 574 \n\
 575 %s\n\
 576 \n\
 577 ",
 578                 bounceq.id,
 579                 hostname(), VERSION,
 580                 rfc822date(),
 581                 it->addr,
 582                 it->sender,
 583                 bounceq.id, hostname(),
 584                 rfc822date(),
 585                 VERSION, hostname(),
 586                 it->addr,
 587                 reason,
 588                 config->features & FULLBOUNCE? "Original message follows.":
 589                 "Message headers follow.");
 590         free(reason);
 591         if (error < 0)
 592                 goto fail;
 593         if (fflush(bit->queuef) != 0)
 594                 goto fail;
 595
 596         if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0)
 597                 goto fail;
 598         if (config->features & FULLBOUNCE) {
 599                 while ((pos = fread(line, 1, sizeof(line), it->queuef)) > 0) {
 600                         if ((size_t)write(bounceq.mailfd, line, pos) != pos)
 601                                 goto fail;
 602                 }
 603         } else {
 604                 while (!feof(it->queuef)) {
 605                         if (fgets(line, sizeof(line), it->queuef) == NULL)
 606                                 break;
 607                         if (line[0] == '\n')
 608                                 break;
 609                         if ((size_t)write(bounceq.mailfd, line, strlen(line)) != strlen(line))
 610                                 goto fail;
 611                 }
 612         }
 613         if (fsync(bounceq.mailfd) != 0)
 614                 goto fail;
 615         if (linkspool(&bounceq) != 0)
 616                 goto fail;
 617         /* bounce is safe */
 618
 619         unlink(it->queuefn);
 620         fclose(it->queuef);
 621
 622         bit = go_background(&bounceq);
 623         deliver(bit);
 624         /* NOTREACHED */
 625
 626 fail:
 627         syslog(LOG_CRIT, "%s: error creating bounce: %m", it->queueid);
 628         unlink(it->queuefn);
 629         exit(1);
 630 }
 631
 632 static int
 633 deliver_local(struct qitem *it, char **errmsg)
 634 {
 635         char fn[PATH_MAX+1];
 636         char line[1000];
 637         size_t linelen;
 638         int mbox;
 639         int error;
 640         off_t mboxlen;
 641         time_t now = time(NULL);
 642
 643         error = snprintf(fn, sizeof(fn), "%s/%s", _PATH_MAILDIR, it->addr);
 644         if (error < 0 || (size_t)error >= sizeof(fn)) {
 645                 syslog(LOG_ERR, "%s: local delivery deferred: %m",
 646                        it->queueid);
 647                 return (1);
 648         }
 649
 650         /* mailx removes users mailspool file if empty, so open with O_CREAT */
 651         mbox = open_locked(fn, O_WRONLY | O_APPEND | O_CREAT);
 652         if (mbox < 0) {
 653                 syslog(LOG_ERR, "%s: local delivery deferred: can not open `%s': %m",
 654                        it->queueid, fn);
 655                 return (1);
 656         }
 657         mboxlen = lseek(mbox, 0, SEEK_CUR);
 658
 659         if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0) {
 660                 syslog(LOG_ERR, "%s: local delivery deferred: can not seek: %m",
 661                        it->queueid);
 662                 return (1);
 663         }
 664
 665         error = snprintf(line, sizeof(line), "From %s\t%s", it->sender, ctime(&now));
 666         if (error < 0 || (size_t)error >= sizeof(line)) {
 667                 syslog(LOG_ERR, "%s: local delivery deferred: can not write header: %m",
 668                        it->queueid);
 669                 return (1);
 670         }
 671         if (write(mbox, line, error) != error)
 672                 goto wrerror;
 673
 674         while (!feof(it->queuef)) {
 675                 if (fgets(line, sizeof(line), it->queuef) == NULL)
 676                         break;
 677                 linelen = strlen(line);
 678                 if (linelen == 0 || line[linelen - 1] != '\n') {
 679                         syslog(LOG_CRIT, "%s: local delivery failed: corrupted queue file",
 680                                it->queueid);
 681                         *errmsg = strdup("corrupted queue file");
 682                         error = -1;
 683                         goto chop;
 684                 }
 685
 686                 if (strncmp(line, "From ", 5) == 0) {
 687                         const char *gt = ">";
 688
 689                         if (write(mbox, gt, 1) != 1)
 690                                 goto wrerror;
 691                 }
 692                 if ((size_t)write(mbox, line, linelen) != linelen)
 693                         goto wrerror;
 694         }
 695         line[0] = '\n';
 696         if (write(mbox, line, 1) != 1)
 697                 goto wrerror;
 698         close(mbox);
 699         return (0);
 700
 701 wrerror:
 702         syslog(LOG_ERR, "%s: local delivery failed: write error: %m",
 703                it->queueid);
 704         error = 1;
 705 chop:
 706         if (ftruncate(mbox, mboxlen) != 0)
 707                 syslog(LOG_WARNING, "%s: error recovering mbox `%s': %m",
 708                        it->queueid, fn);
 709         close(mbox);
 710         return (error);
 711 }
 712
 713 static void
 714 deliver(struct qitem *it)
 715 {
 716         int error;
 717         unsigned int backoff = MIN_RETRY;
 718         char *errmsg = strdup("unknown bounce reason");
 719         struct timeval now;
 720         struct stat st;
 721
 722         syslog(LOG_INFO, "%s: mail from=<%s> to=<%s>",
 723                it->queueid, it->sender, it->addr);
 724
 725 retry:
 726         syslog(LOG_INFO, "%s: trying delivery",
 727                it->queueid);
 728
 729         if (it->remote)
 730                 error = deliver_remote(it, &errmsg);
 731         else
 732                 error = deliver_local(it, &errmsg);
 733
 734         switch (error) {
 735         case 0:
 736                 unlink(it->queuefn);
 737                 syslog(LOG_INFO, "%s: delivery successful",
 738                        it->queueid);
 739                 exit(0);
 740
 741         case 1:
 742                 if (stat(it->queuefn, &st) != 0) {
 743                         syslog(LOG_ERR, "%s: lost queue file `%s'",
 744                                it->queueid, it->queuefn);
 745                         exit(1);
 746                 }
 747                 if (gettimeofday(&now, NULL) == 0 &&
 748                     (now.tv_sec - st.st_mtimespec.tv_sec > MAX_TIMEOUT)) {
 749                         asprintf(&errmsg,
 750                                  "Could not deliver for the last %d seconds. Giving up.",
 751                                  MAX_TIMEOUT);
 752                         goto bounce;
 753                 }
 754                 sleep(backoff);
 755                 backoff *= 2;
 756                 if (backoff > MAX_RETRY)
 757                         backoff = MAX_RETRY;
 758                 goto retry;
 759
 760         case -1:
 761         default:
 762                 break;
 763         }
 764
 765 bounce:
 766         bounce(it, errmsg);
 767         /* NOTREACHED */
 768 }
 769
 770 static int
 771 c2x(char c)
 772 {
 773         if (c <= '9')
 774                 return (c - '0');
 775         else if (c <= 'F')
 776                 return (c - 'A' + 10);
 777         else
 778                 return (c - 'a' + 10);
 779 }
 780
 781 static void
 782 seen_init(void)
 783 {
 784         int i, j;
 785
 786         for (i = 0; i < 16; i++)
 787                 for (j = 0; j < 16; j++)
 788                         SLIST_INIT(&seenmsg[i][j]);
 789 }
 790
 791 static int
 792 seen(const char *msgid)
 793 {
 794         const char *p;
 795         size_t len;
 796         int i, j;
 797         struct stritem *t;
 798
 799         p = strchr(msgid, '.');
 800         if (p == NULL)
 801                 return (0);
 802         len = p - msgid;
 803         if (len >= 2) {
 804                 i = c2x(msgid[len - 2]);
 805                 j = c2x(msgid[len - 1]);
 806         } else if (len == 1) {
 807                 i = c2x(msgid[0]);
 808                 j = 0;
 809         } else {
 810                 i = j = 0;
 811         }
 812         if (i < 0 || i >= 16 || j < 0 || j >= 16)
 813                 errx(1, "INTERNAL ERROR: bad seen code for msgid %s", msgid);
 814         SLIST_FOREACH(t, &seenmsg[i][j], next)
 815                 if (!strncmp(t->str, msgid, len))
 816                         return (1);
 817         t = malloc(sizeof(*t));
 818         if (t == NULL)
 819                 errx(1, "Could not allocate %lu bytes",
 820                     (unsigned long)(sizeof(*t)));
 821         t->str = strdup(msgid);
 822         if (t->str == NULL)
 823                 errx(1, "Could not duplicate msgid %s", msgid);
 824         SLIST_INSERT_HEAD(&seenmsg[i][j], t, next);
 825         return (0);
 826 }
 827
 828 static void
 829 load_queue(struct queue *queue, int ignorelock)
 830 {
 831         struct stat st;
 832         struct qitem *it;
 833         //struct queue queue, itmqueue;
 834         struct queue itmqueue;
 835         DIR *spooldir;
 836         struct dirent *de;
 837         char line[1000];
 838         char *fn;
 839         FILE *queuef;
 840         char *sender;
 841         char *addr;
 842         char *queueid;
 843         char *queuefn;
 844         off_t hdrlen;
 845         int fd, locked, seenit;
 846
 847         LIST_INIT(&queue->queue);
 848
 849         spooldir = opendir(config->spooldir);
 850         if (spooldir == NULL)
 851                 err(1, "reading queue");
 852
 853         seen_init();
 854         while ((de = readdir(spooldir)) != NULL) {
 855                 sender = NULL;
 856                 queuef = NULL;
 857                 queueid = NULL;
 858                 queuefn = NULL;
 859                 fn = NULL;
 860                 LIST_INIT(&itmqueue.queue);
 861
 862                 /* ignore temp files */
 863                 if (strncmp(de->d_name, "tmp_", 4) == 0 ||
 864                     de->d_type != DT_REG)
 865                         continue;
 866                 if (asprintf(&queuefn, "%s/%s", config->spooldir, de->d_name) < 0)
 867                         goto fail;
 868                 seenit = seen(de->d_name);
 869                 locked = 0;
 870                 fd = open_locked(queuefn, O_RDONLY|O_NONBLOCK);
 871                 if (fd < 0) {
 872                         /* Ignore locked files */
 873                         if (errno != EWOULDBLOCK)
 874                                 goto skip_item;
 875                         if (!ignorelock || seenit)
 876                                 continue;
 877                         fd = open(queuefn, O_RDONLY);
 878                         if (fd < 0)
 879                                 goto skip_item;
 880                         locked = 1;
 881                 }
 882
 883                 queuef = fdopen(fd, "r");
 884                 if (queuef == NULL)
 885                         goto skip_item;
 886                 if (fgets(line, sizeof(line), queuef) == NULL ||
 887                     line[0] == 0)
 888                         goto skip_item;
 889                 line[strlen(line) - 1] = 0;     /* chop newline */
 890                 sender = strdup(line);
 891                 if (sender == NULL)
 892                         goto skip_item;
 893
 894                 for (;;) {
 895                         if (fgets(line, sizeof(line), queuef) == NULL ||
 896                             line[0] == 0)
 897                                 goto skip_item;
 898                         if (line[0] == '\n')
 899                                 break;
 900                         line[strlen(line) - 1] = 0;
 901                         queueid = strdup(line);
 902                         if (queueid == NULL)
 903                                 goto skip_item;
 904                         addr = strchr(queueid, ' ');
 905                         if (addr == NULL)
 906                                 goto skip_item;
 907                         *addr++ = 0;
 908                         if (fn != NULL)
 909                                 free(fn);
 910                         if (asprintf(&fn, "%s/%s", config->spooldir, queueid) < 0)
 911                                 goto skip_item;
 912                         /* Item has already been delivered? */
 913                         if (stat(fn, &st) != 0)
 914                                 continue;
 915                         if (add_recp(&itmqueue, addr, sender, 0) != 0)
 916                                 goto skip_item;
 917                         it = LIST_FIRST(&itmqueue.queue);
 918                         it->queuef = queuef;
 919                         it->queueid = queueid;
 920                         it->queuefn = fn;
 921                         it->locked = locked;
 922                         fn = NULL;
 923                 }
 924                 if (LIST_EMPTY(&itmqueue.queue)) {
 925                         warnx("queue file without items: `%s'", queuefn);
 926                         goto skip_item2;
 927                 }
 928                 hdrlen = ftell(queuef);
 929                 while ((it = LIST_FIRST(&itmqueue.queue)) != NULL) {
 930                         it->hdrlen = hdrlen;
 931                         LIST_REMOVE(it, next);
 932                         LIST_INSERT_HEAD(&queue->queue, it, next);
 933                 }
 934                 continue;
 935
 936 skip_item:
 937                 warn("reading queue: `%s'", queuefn);
 938 skip_item2:
 939                 if (sender != NULL)
 940                         free(sender);
 941                 if (queuefn != NULL)
 942                         free(queuefn);
 943                 if (fn != NULL)
 944                         free(fn);
 945                 if (queueid != NULL)
 946                         free(queueid);
 947                 close(fd);
 948         }
 949         closedir(spooldir);
 950         return;
 951
 952 fail:
 953         err(1, "reading queue");
 954 }
 955
 956 static void
 957 run_queue(struct queue *queue)
 958 {
 959         struct qitem *it;
 960
 961         if (LIST_EMPTY(&queue->queue))
 962                 return;
 963
 964         it = go_background(queue);
 965         deliver(it);
 966         /* NOTREACHED */
 967 }
 968
 969 static void
 970 show_queue(struct queue *queue)
 971 {
 972         struct qitem *it;
 973
 974         if (LIST_EMPTY(&queue->queue)) {
 975                 printf("Mail queue is empty\n");
 976                 return;
 977         }
 978
 979         LIST_FOREACH(it, &queue->queue, next) {
 980                 printf("\
 981 ID\t: %s%s\n\
 982 From\t: %s\n\
 983 To\t: %s\n--\n", it->queueid, it->locked? "*": "", it->sender, it->addr);
 984         }
 985 }
 986
 987 /*
 988  * TODO:
 989  *
 990  * - alias processing
 991  * - use group permissions
 992  * - proper sysexit codes
 993  */
 994
 995 int
 996 main(int argc, char **argv)
 997 {
 998         char *sender = NULL;
 999         char tag[255];
1000         struct qitem *it;
1001         struct queue queue;
1002         struct queue lqueue;
1003         int i, ch;
1004         int nodot = 0, doqueue = 0, showq = 0;
1005
1006         atexit(deltmp);
1007         LIST_INIT(&queue.queue);
1008         snprintf(tag, 254, "dma");
1009
1010         opterr = 0;
1011         while ((ch = getopt(argc, argv, "A:b:B:C:d:Df:F:h:iL:N:no:O:q:r:R:UV:vX:")) != -1) {
1012                 switch (ch) {
1013                 case 'A':
1014                         /* -AX is being ignored, except for -A{c,m} */
1015                         if (optarg[0] == 'c' || optarg[0] == 'm') {
1016                                 break;
1017                         }
1018                         /* else FALLTRHOUGH */
1019                 case 'b':
1020                         /* -bX is being ignored, except for -bp */
1021                         if (optarg[0] == 'p') {
1022                                 showq = 1;
1023                                 break;
1024                         }
1025                         /* else FALLTRHOUGH */
1026                 case 'D':
1027                         daemonize = 0;
1028                         break;
1029                 case 'L':
1030                         if (optarg != NULL)
1031                                 snprintf(tag, 254, "%s", optarg);
1032                         break;
1033                 case 'f':
1034                 case 'r':
1035                         sender = optarg;
1036                         break;
1037
1038                 case 'o':
1039                         /* -oX is being ignored, except for -oi */
1040                         if (optarg[0] != 'i')
1041                                 break;
1042                         /* else FALLTRHOUGH */
1043                 case 'O':
1044                         break;
1045                 case 'i':
1046                         nodot = 1;
1047                         break;
1048
1049                 case 'q':
1050                         doqueue = 1;
1051                         break;
1052
1053                 /* Ignored options */
1054                 case 'B':
1055                 case 'C':
1056                 case 'd':
1057                 case 'F':
1058                 case 'h':
1059                 case 'N':
1060                 case 'n':
1061                 case 'R':
1062                 case 'U':
1063                 case 'V':
1064                 case 'v':
1065                 case 'X':
1066                         break;
1067
1068                 default:
1069                         exit(1);
1070                 }
1071         }
1072         argc -= optind;
1073         argv += optind;
1074         opterr = 1;
1075
1076         openlog(tag, LOG_PID | LOG_PERROR, LOG_MAIL);
1077         set_username();
1078
1079         config = malloc(sizeof(struct config));
1080         if (config == NULL)
1081                 errx(1, "Cannot allocate enough memory");
1082
1083         memset(config, 0, sizeof(struct config));
1084         if (parse_conf(CONF_PATH, config) < 0) {
1085                 free(config);
1086                 errx(1, "reading config file");
1087         }
1088
1089         if (config->features & VIRTUAL)
1090                 if (parse_virtuser(config->virtualpath) < 0)
1091                         errx(1, "error reading virtual user file: %s",
1092                                 config->virtualpath);
1093
1094         if (parse_authfile(config->authpath) < 0)
1095                 err(1, "reading SMTP authentication file");
1096
1097         if (showq) {
1098                 if (argc != 0)
1099                         errx(1, "sending mail and displaying queue is"
1100                                 " mutually exclusive");
1101                 load_queue(&lqueue, 1);
1102                 show_queue(&lqueue);
1103                 return (0);
1104         }
1105
1106         if (doqueue) {
1107                 if (argc != 0)
1108                         errx(1, "sending mail and queue pickup is mutually exclusive");
1109                 load_queue(&lqueue, 0);
1110                 run_queue(&lqueue);
1111                 return (0);
1112         }
1113
1114         if (read_aliases() != 0)
1115                 err(1, "reading aliases");
1116
1117         if ((sender = set_from(sender)) == NULL)
1118                 err(1, "setting from address");
1119
1120         for (i = 0; i < argc; i++) {
1121                 if (add_recp(&queue, argv[i], sender, 1) != 0)
1122                         errx(1, "invalid recipient `%s'\n", argv[i]);
1123         }
1124
1125         if (LIST_EMPTY(&queue.queue))
1126                 errx(1, "no recipients");
1127
1128         if (gentempf(&queue) != 0)
1129                 err(1, "create temp file");
1130
1131         if (preparespool(&queue, sender) != 0)
1132                 err(1, "creating spools (1)");
1133
1134         if (readmail(&queue, sender, nodot) != 0)
1135                 err(1, "reading mail");
1136
1137         if (linkspool(&queue) != 0)
1138                 err(1, "creating spools (2)");
1139
1140         /* From here on the mail is safe. */
1141
1142         if (config->features & DEFER)
1143                 return (0);
1144
1145         it = go_background(&queue);
1146         deliver(it);
1147
1148         /* NOTREACHED */
1149         return (0);
1150 }