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 = NULL;
 138
 139         uid = getuid();
 140         username = check_username(getlogin(), uid);
 141         if (username != NULL)
 142                 return;
 143         username = check_username(getenv("LOGNAME"), uid);
 144         if (username != NULL)
 145                 return;
 146         username = check_username(getenv("USER"), uid);
 147         if (username != NULL)
 148                 return;
 149         pwd = getpwuid(uid);
 150         if (pwd != NULL && pwd->pw_name != NULL && pwd->pw_name[0] != '\0' &&
 151             (u = strdup(pwd->pw_name)) != NULL) {
 152                 username = check_username(u, uid);
 153                 if (username != NULL)
 154                         return;
 155                 else
 156                         free(u);
 157         }
 158         asprintf(__DECONST(void *, &username), "%ld", (long)uid);
 159         if (username != NULL)
 160                 return;
 161         username = "unknown-or-invalid-username";
 162 }
 163
 164 static char *
 165 set_from(const char *osender)
 166 {
 167         struct virtuser *v;
 168         char *sender;
 169
 170         if ((config->features & VIRTUAL) != 0) {
 171                 SLIST_FOREACH(v, &virtusers, next) {
 172                         if (strcmp(v->login, username) == 0) {
 173                                 sender = strdup(v->address);
 174                                 if (sender == NULL)
 175                                         return(NULL);
 176                                 goto out;
 177                         }
 178                 }
 179         }
 180
 181         if (osender) {
 182                 sender = strdup(osender);
 183                 if (sender == NULL)
 184                         return (NULL);
 185         } else {
 186                 if (asprintf(&sender, "%s@%s", username, hostname()) <= 0)
 187                         return (NULL);
 188         }
 189
 190         if (strchr(sender, '\n') != NULL) {
 191                 errno = EINVAL;
 192                 return (NULL);
 193         }
 194
 195 out:
 196         return (sender);
 197 }
 198
 199 static int
 200 read_aliases(void)
 201 {
 202         yyin = fopen(config->aliases, "r");
 203         if (yyin == NULL)
 204                 return (0);     /* not fatal */
 205         if (yyparse())
 206                 return (-1);    /* fatal error, probably malloc() */
 207         fclose(yyin);
 208         return (0);
 209 }
 210
 211 static int
 212 add_recp(struct queue *queue, const char *str, const char *sender, int expand)
 213 {
 214         struct qitem *it, *tit;
 215         struct stritem *sit;
 216         struct alias *al;
 217         struct passwd *pw;
 218         char *host;
 219         int aliased = 0;
 220
 221         it = calloc(1, sizeof(*it));
 222         if (it == NULL)
 223                 return (-1);
 224         it->addr = strdup(str);
 225         if (it->addr == NULL)
 226                 return (-1);
 227
 228         it->sender = sender;
 229         host = strrchr(it->addr, '@');
 230         if (host != NULL &&
 231             (strcmp(host + 1, hostname()) == 0 ||
 232              strcmp(host + 1, "localhost") == 0)) {
 233                 *host = 0;
 234         }
 235         LIST_FOREACH(tit, &queue->queue, next) {
 236                 /* weed out duplicate dests */
 237                 if (strcmp(tit->addr, it->addr) == 0) {
 238                         free(it->addr);
 239                         free(it);
 240                         return (0);
 241                 }
 242         }
 243         LIST_INSERT_HEAD(&queue->queue, it, next);
 244         if (strrchr(it->addr, '@') == NULL) {
 245                 it->remote = 0;
 246                 if (expand) {
 247                         LIST_FOREACH(al, &aliases, next) {
 248                                 if (strcmp(al->alias, it->addr) != 0)
 249                                         continue;
 250                                 SLIST_FOREACH(sit, &al->dests, next) {
 251                                         if (add_recp(queue, sit->str, sender, 1) != 0)
 252                                                 return (-1);
 253                                 }
 254                                 aliased = 1;
 255                         }
 256                         if (aliased) {
 257                                 LIST_REMOVE(it, next);
 258                         } else {
 259                                 /* Local destination, check */
 260                                 pw = getpwnam(it->addr);
 261                                 if (pw == NULL)
 262                                         goto out;
 263                                 endpwent();
 264                         }
 265                 }
 266         } else {
 267                 it->remote = 1;
 268         }
 269
 270         return (0);
 271
 272 out:
 273         free(it->addr);
 274         free(it);
 275         return (-1);
 276 }
 277
 278 static void
 279 deltmp(void)
 280 {
 281         struct stritem *t;
 282
 283         SLIST_FOREACH(t, &tmpfs, next) {
 284                 unlink(t->str);
 285         }
 286 }
 287
 288 static int
 289 gentempf(struct queue *queue)
 290 {
 291         char fn[PATH_MAX+1];
 292         struct stritem *t;
 293         int fd;
 294
 295         if (snprintf(fn, sizeof(fn), "%s/%s", config->spooldir, "tmp_XXXXXXXXXX") <= 0)
 296                 return (-1);
 297         fd = mkstemp(fn);
 298         if (fd < 0)
 299                 return (-1);
 300         if (flock(fd, LOCK_EX) == -1)
 301                 return (-1);
 302         queue->mailfd = fd;
 303         queue->tmpf = strdup(fn);
 304         if (queue->tmpf == NULL) {
 305                 unlink(fn);
 306                 return (-1);
 307         }
 308         t = malloc(sizeof(*t));
 309         if (t != NULL) {
 310                 t->str = queue->tmpf;
 311                 SLIST_INSERT_HEAD(&tmpfs, t, next);
 312         }
 313         return (0);
 314 }
 315
 316 static int
 317 open_locked(const char *fname, int flags)
 318 {
 319 #ifndef O_EXLOCK
 320         int fd, save_errno;
 321
 322         fd = open(fname, flags, 0);
 323         if (fd < 0)
 324                 return(fd);
 325         if (flock(fd, LOCK_EX|((flags & O_NONBLOCK)? LOCK_NB: 0)) < 0) {
 326                 save_errno = errno;
 327                 close(fd);
 328                 errno = save_errno;
 329                 return(-1);
 330         }
 331         return(fd);
 332 #else
 333         return(open(fname, flags|O_EXLOCK));
 334 #endif
 335 }
 336
 337 /*
 338  * spool file format:
 339  *
 340  * envelope-from
 341  * queue-id1 envelope-to1
 342  * queue-id2 envelope-to2
 343  * ...
 344  * <empty line>
 345  * mail data
 346  *
 347  * queue ids are unique, formed from the inode of the spool file
 348  * and a unique identifier.
 349  */
 350 static int
 351 preparespool(struct queue *queue, const char *sender)
 352 {
 353         char line[1000];        /* by RFC2822 */
 354         struct stat st;
 355         int error;
 356         struct qitem *it;
 357         FILE *queuef;
 358         off_t hdrlen;
 359
 360         error = snprintf(line, sizeof(line), "%s\n", sender);
 361         if (error < 0 || (size_t)error >= sizeof(line)) {
 362                 errno = E2BIG;
 363                 return (-1);
 364         }
 365         if (write(queue->mailfd, line, error) != error)
 366                 return (-1);
 367
 368         queuef = fdopen(queue->mailfd, "r+");
 369         if (queuef == NULL)
 370                 return (-1);
 371
 372         /*
 373          * Assign queue id to each dest.
 374          */
 375         if (fstat(queue->mailfd, &st) != 0)
 376                 return (-1);
 377         queue->id = st.st_ino;
 378         LIST_FOREACH(it, &queue->queue, next) {
 379                 if (asprintf(&it->queueid, "%"PRIxMAX".%"PRIxPTR,
 380                              queue->id, (uintptr_t)it) <= 0)
 381                         return (-1);
 382                 if (asprintf(&it->queuefn, "%s/%s",
 383                              config->spooldir, it->queueid) <= 0)
 384                         return (-1);
 385                 /* File may not exist yet */
 386                 if (stat(it->queuefn, &st) == 0)
 387                         return (-1);
 388                 it->queuef = queuef;
 389                 error = snprintf(line, sizeof(line), "%s %s\n",
 390                                it->queueid, it->addr);
 391                 if (error < 0 || (size_t)error >= sizeof(line))
 392                         return (-1);
 393                 if (write(queue->mailfd, line, error) != error)
 394                         return (-1);
 395         }
 396         line[0] = '\n';
 397         if (write(queue->mailfd, line, 1) != 1)
 398                 return (-1);
 399
 400         hdrlen = lseek(queue->mailfd, 0, SEEK_CUR);
 401         LIST_FOREACH(it, &queue->queue, next) {
 402                 it->hdrlen = hdrlen;
 403         }
 404         return (0);
 405 }
 406
 407 static char *
 408 rfc822date(void)
 409 {
 410         static char str[50];
 411         size_t error;
 412         time_t now;
 413
 414         now = time(NULL);
 415         error = strftime(str, sizeof(str), "%a, %d %b %Y %T %z",
 416                        localtime(&now));
 417         if (error == 0)
 418                 strcpy(str, "(date fail)");
 419         return (str);
 420 }
 421
 422 static int
 423 readmail(struct queue *queue, const char *sender, int nodot)
 424 {
 425         char line[1000];        /* by RFC2822 */
 426         size_t linelen;
 427         int error;
 428
 429         error = snprintf(line, sizeof(line), "\
 430 Received: from %s (uid %d)\n\
 431 \t(envelope-from %s)\n\
 432 \tid %"PRIxMAX"\n\
 433 \tby %s (%s)\n\
 434 \t%s\n",
 435                 username, uid,
 436                 sender,
 437                 queue->id,
 438                 hostname(), VERSION,
 439                 rfc822date());
 440         if (error < 0 || (size_t)error >= sizeof(line))
 441                 return (-1);
 442         if (write(queue->mailfd, line, error) != error)
 443                 return (-1);
 444
 445         while (!feof(stdin)) {
 446                 if (fgets(line, sizeof(line), stdin) == NULL)
 447                         break;
 448                 linelen = strlen(line);
 449                 if (linelen == 0 || line[linelen - 1] != '\n') {
 450                         errno = EINVAL;         /* XXX mark permanent errors */
 451                         return (-1);
 452                 }
 453                 if (!nodot && linelen == 2 && line[0] == '.')
 454                         break;
 455                 if ((size_t)write(queue->mailfd, line, linelen) != linelen)
 456                         return (-1);
 457         }
 458         if (fsync(queue->mailfd) != 0)
 459                 return (-1);
 460         return (0);
 461 }
 462
 463 static int
 464 linkspool(struct queue *queue)
 465 {
 466         struct qitem *it;
 467
 468         LIST_FOREACH(it, &queue->queue, next) {
 469                 if (link(queue->tmpf, it->queuefn) != 0)
 470                         goto delfiles;
 471         }
 472         unlink(queue->tmpf);
 473         return (0);
 474
 475 delfiles:
 476         LIST_FOREACH(it, &queue->queue, next) {
 477                 unlink(it->queuefn);
 478         }
 479         return (-1);
 480 }
 481
 482 static struct qitem *
 483 go_background(struct queue *queue)
 484 {
 485         struct sigaction sa;
 486         struct qitem *it;
 487         pid_t pid;
 488
 489         if (daemonize && daemon(0, 0) != 0) {
 490                 syslog(LOG_ERR, "can not daemonize: %m");
 491                 exit(1);
 492         }
 493         daemonize = 0;
 494
 495         bzero(&sa, sizeof(sa));
 496         sa.sa_flags = SA_NOCLDWAIT;
 497         sa.sa_handler = SIG_IGN;
 498         sigaction(SIGCHLD, &sa, NULL);
 499
 500         LIST_FOREACH(it, &queue->queue, next) {
 501                 /* No need to fork for the last dest */
 502                 if (LIST_NEXT(it, next) == NULL)
 503                         return (it);
 504
 505                 pid = fork();
 506                 switch (pid) {
 507                 case -1:
 508                         syslog(LOG_ERR, "can not fork: %m");
 509                         exit(1);
 510                         break;
 511
 512                 case 0:
 513                         /*
 514                          * Child:
 515                          *
 516                          * return and deliver mail
 517                          */
 518                         return (it);
 519
 520                 default:
 521                         /*
 522                          * Parent:
 523                          *
 524                          * fork next child
 525                          */
 526                         break;
 527                 }
 528         }
 529
 530         syslog(LOG_CRIT, "reached dead code");
 531         exit(1);
 532 }
 533
 534 static void
 535 bounce(struct qitem *it, const char *reason)
 536 {
 537         struct queue bounceq;
 538         struct qitem *bit;
 539         char line[1000];
 540         size_t pos;
 541         int error;
 542
 543         /* Don't bounce bounced mails */
 544         if (it->sender[0] == 0) {
 545                 syslog(LOG_CRIT, "%s: delivery panic: can't bounce a bounce",
 546                        it->queueid);
 547                 exit(1);
 548         }
 549
 550         syslog(LOG_ERR, "%s: delivery failed, bouncing",
 551                it->queueid);
 552
 553         LIST_INIT(&bounceq.queue);
 554         if (add_recp(&bounceq, it->sender, "", 1) != 0)
 555                 goto fail;
 556         if (gentempf(&bounceq) != 0)
 557                 goto fail;
 558         if (preparespool(&bounceq, "") != 0)
 559                 goto fail;
 560
 561         bit = LIST_FIRST(&bounceq.queue);
 562         error = fprintf(bit->queuef, "\
 563 Received: from MAILER-DAEMON\n\
 564 \tid %"PRIxMAX"\n\
 565 \tby %s (%s)\n\
 566 \t%s\n\
 567 X-Original-To: <%s>\n\
 568 From: MAILER-DAEMON <>\n\
 569 To: %s\n\
 570 Subject: Mail delivery failed\n\
 571 Message-Id: <%"PRIxMAX"@%s>\n\
 572 Date: %s\n\
 573 \n\
 574 This is the %s at %s.\n\
 575 \n\
 576 There was an error delivering your mail to <%s>.\n\
 577 \n\
 578 %s\n\
 579 \n\
 580 %s\n\
 581 \n\
 582 ",
 583                 bounceq.id,
 584                 hostname(), VERSION,
 585                 rfc822date(),
 586                 it->addr,
 587                 it->sender,
 588                 bounceq.id, hostname(),
 589                 rfc822date(),
 590                 VERSION, hostname(),
 591                 it->addr,
 592                 reason,
 593                 config->features & FULLBOUNCE? "Original message follows.":
 594                 "Message headers follow.");
 595         if (error < 0)
 596                 goto fail;
 597         if (fflush(bit->queuef) != 0)
 598                 goto fail;
 599
 600         if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0)
 601                 goto fail;
 602         if (config->features & FULLBOUNCE) {
 603                 while ((pos = fread(line, 1, sizeof(line), it->queuef)) > 0) {
 604                         if ((size_t)write(bounceq.mailfd, line, pos) != pos)
 605                                 goto fail;
 606                 }
 607         } else {
 608                 while (!feof(it->queuef)) {
 609                         if (fgets(line, sizeof(line), it->queuef) == NULL)
 610                                 break;
 611                         if (line[0] == '\n')
 612                                 break;
 613                         if ((size_t)write(bounceq.mailfd, line, strlen(line)) != strlen(line))
 614                                 goto fail;
 615                 }
 616         }
 617         if (fsync(bounceq.mailfd) != 0)
 618                 goto fail;
 619         if (linkspool(&bounceq) != 0)
 620                 goto fail;
 621         /* bounce is safe */
 622
 623         unlink(it->queuefn);
 624         fclose(it->queuef);
 625
 626         bit = go_background(&bounceq);
 627         deliver(bit);
 628         /* NOTREACHED */
 629
 630 fail:
 631         syslog(LOG_CRIT, "%s: error creating bounce: %m", it->queueid);
 632         unlink(it->queuefn);
 633         exit(1);
 634 }
 635
 636 static int
 637 deliver_local(struct qitem *it, const char **errmsg)
 638 {
 639         char fn[PATH_MAX+1];
 640         char line[1000];
 641         size_t linelen;
 642         int mbox;
 643         int error;
 644         off_t mboxlen;
 645         time_t now = time(NULL);
 646
 647         error = snprintf(fn, sizeof(fn), "%s/%s", _PATH_MAILDIR, it->addr);
 648         if (error < 0 || (size_t)error >= sizeof(fn)) {
 649                 syslog(LOG_ERR, "%s: local delivery deferred: %m",
 650                        it->queueid);
 651                 return (1);
 652         }
 653
 654         /* mailx removes users mailspool file if empty, so open with O_CREAT */
 655         mbox = open_locked(fn, O_WRONLY | O_APPEND | O_CREAT);
 656         if (mbox < 0) {
 657                 syslog(LOG_ERR, "%s: local delivery deferred: can not open `%s': %m",
 658                        it->queueid, fn);
 659                 return (1);
 660         }
 661         mboxlen = lseek(mbox, 0, SEEK_CUR);
 662
 663         if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0) {
 664                 syslog(LOG_ERR, "%s: local delivery deferred: can not seek: %m",
 665                        it->queueid);
 666                 return (1);
 667         }
 668
 669         error = snprintf(line, sizeof(line), "From %s\t%s", it->sender, ctime(&now));
 670         if (error < 0 || (size_t)error >= sizeof(line)) {
 671                 syslog(LOG_ERR, "%s: local delivery deferred: can not write header: %m",
 672                        it->queueid);
 673                 return (1);
 674         }
 675         if (write(mbox, line, error) != error)
 676                 goto wrerror;
 677
 678         while (!feof(it->queuef)) {
 679                 if (fgets(line, sizeof(line), it->queuef) == NULL)
 680                         break;
 681                 linelen = strlen(line);
 682                 if (linelen == 0 || line[linelen - 1] != '\n') {
 683                         syslog(LOG_CRIT, "%s: local delivery failed: corrupted queue file",
 684                                it->queueid);
 685                         *errmsg = "corrupted queue file";
 686                         error = -1;
 687                         goto chop;
 688                 }
 689
 690                 if (strncmp(line, "From ", 5) == 0) {
 691                         const char *gt = ">";
 692
 693                         if (write(mbox, gt, 1) != 1)
 694                                 goto wrerror;
 695                 }
 696                 if ((size_t)write(mbox, line, linelen) != linelen)
 697                         goto wrerror;
 698         }
 699         line[0] = '\n';
 700         if (write(mbox, line, 1) != 1)
 701                 goto wrerror;
 702         close(mbox);
 703         return (0);
 704
 705 wrerror:
 706         syslog(LOG_ERR, "%s: local delivery failed: write error: %m",
 707                it->queueid);
 708         error = 1;
 709 chop:
 710         if (ftruncate(mbox, mboxlen) != 0)
 711                 syslog(LOG_WARNING, "%s: error recovering mbox `%s': %m",
 712                        it->queueid, fn);
 713         close(mbox);
 714         return (error);
 715 }
 716
 717 static void
 718 deliver(struct qitem *it)
 719 {
 720         int error;
 721         unsigned int backoff = MIN_RETRY;
 722         const char *errmsg = "unknown bounce reason";
 723         struct timeval now;
 724         struct stat st;
 725
 726         syslog(LOG_INFO, "%s: mail from=<%s> to=<%s>",
 727                it->queueid, it->sender, it->addr);
 728
 729 retry:
 730         syslog(LOG_INFO, "%s: trying delivery",
 731                it->queueid);
 732
 733         if (it->remote)
 734                 error = deliver_remote(it, &errmsg);
 735         else
 736                 error = deliver_local(it, &errmsg);
 737
 738         switch (error) {
 739         case 0:
 740                 unlink(it->queuefn);
 741                 syslog(LOG_INFO, "%s: delivery successful",
 742                        it->queueid);
 743                 exit(0);
 744
 745         case 1:
 746                 if (stat(it->queuefn, &st) != 0) {
 747                         syslog(LOG_ERR, "%s: lost queue file `%s'",
 748                                it->queueid, it->queuefn);
 749                         exit(1);
 750                 }
 751                 if (gettimeofday(&now, NULL) == 0 &&
 752                     (now.tv_sec - st.st_mtimespec.tv_sec > MAX_TIMEOUT)) {
 753                         asprintf(__DECONST(void *, &errmsg),
 754                                  "Could not deliver for the last %d seconds. Giving up.",
 755                                  MAX_TIMEOUT);
 756                         goto bounce;
 757                 }
 758                 sleep(backoff);
 759                 backoff *= 2;
 760                 if (backoff > MAX_RETRY)
 761                         backoff = MAX_RETRY;
 762                 goto retry;
 763
 764         case -1:
 765         default:
 766                 break;
 767         }
 768
 769 bounce:
 770         bounce(it, errmsg);
 771         /* NOTREACHED */
 772 }
 773
 774 static int
 775 c2x(char c)
 776 {
 777         if (c <= '9')
 778                 return (c - '0');
 779         else if (c <= 'F')
 780                 return (c - 'A' + 10);
 781         else
 782                 return (c - 'a' + 10);
 783 }
 784
 785 static void
 786 seen_init(void)
 787 {
 788         int i, j;
 789
 790         for (i = 0; i < 16; i++)
 791                 for (j = 0; j < 16; j++)
 792                         SLIST_INIT(&seenmsg[i][j]);
 793 }
 794
 795 static int
 796 seen(const char *msgid)
 797 {
 798         const char *p;
 799         size_t len;
 800         int i, j;
 801         struct stritem *t;
 802
 803         p = strchr(msgid, '.');
 804         if (p == NULL)
 805                 return (0);
 806         len = p - msgid;
 807         if (len >= 2) {
 808                 i = c2x(msgid[len - 2]);
 809                 j = c2x(msgid[len - 1]);
 810         } else if (len == 1) {
 811                 i = c2x(msgid[0]);
 812                 j = 0;
 813         } else {
 814                 i = j = 0;
 815         }
 816         if (i < 0 || i >= 16 || j < 0 || j >= 16)
 817                 errx(1, "INTERNAL ERROR: bad seen code for msgid %s", msgid);
 818         SLIST_FOREACH(t, &seenmsg[i][j], next)
 819                 if (!strncmp(t->str, msgid, len))
 820                         return (1);
 821         t = malloc(sizeof(*t));
 822         if (t == NULL)
 823                 errx(1, "Could not allocate %lu bytes",
 824                     (unsigned long)(sizeof(*t)));
 825         t->str = strdup(msgid);
 826         if (t->str == NULL)
 827                 errx(1, "Could not duplicate msgid %s", msgid);
 828         SLIST_INSERT_HEAD(&seenmsg[i][j], t, next);
 829         return (0);
 830 }
 831
 832 static void
 833 load_queue(struct queue *queue, int ignorelock)
 834 {
 835         struct stat st;
 836         struct qitem *it;
 837         //struct queue queue, itmqueue;
 838         struct queue itmqueue;
 839         DIR *spooldir;
 840         struct dirent *de;
 841         char line[1000];
 842         char *fn;
 843         FILE *queuef;
 844         char *sender;
 845         char *addr;
 846         char *queueid;
 847         char *queuefn;
 848         off_t hdrlen;
 849         int fd, locked, seenit;
 850
 851         LIST_INIT(&queue->queue);
 852
 853         spooldir = opendir(config->spooldir);
 854         if (spooldir == NULL)
 855                 err(1, "reading queue");
 856
 857         seen_init();
 858         while ((de = readdir(spooldir)) != NULL) {
 859                 sender = NULL;
 860                 queuef = NULL;
 861                 queueid = NULL;
 862                 queuefn = NULL;
 863                 fn = NULL;
 864                 LIST_INIT(&itmqueue.queue);
 865
 866                 /* ignore temp files */
 867                 if (strncmp(de->d_name, "tmp_", 4) == 0 ||
 868                     de->d_type != DT_REG)
 869                         continue;
 870                 if (asprintf(&queuefn, "%s/%s", config->spooldir, de->d_name) < 0)
 871                         goto fail;
 872                 seenit = seen(de->d_name);
 873                 locked = 0;
 874                 fd = open_locked(queuefn, O_RDONLY|O_NONBLOCK);
 875                 if (fd < 0) {
 876                         /* Ignore locked files */
 877                         if (errno != EWOULDBLOCK)
 878                                 goto skip_item;
 879                         if (!ignorelock || seenit)
 880                                 continue;
 881                         fd = open(queuefn, O_RDONLY);
 882                         if (fd < 0)
 883                                 goto skip_item;
 884                         locked = 1;
 885                 }
 886
 887                 queuef = fdopen(fd, "r");
 888                 if (queuef == NULL)
 889                         goto skip_item;
 890                 if (fgets(line, sizeof(line), queuef) == NULL ||
 891                     line[0] == 0)
 892                         goto skip_item;
 893                 line[strlen(line) - 1] = 0;     /* chop newline */
 894                 sender = strdup(line);
 895                 if (sender == NULL)
 896                         goto skip_item;
 897
 898                 for (;;) {
 899                         if (fgets(line, sizeof(line), queuef) == NULL ||
 900                             line[0] == 0)
 901                                 goto skip_item;
 902                         if (line[0] == '\n')
 903                                 break;
 904                         line[strlen(line) - 1] = 0;
 905                         queueid = strdup(line);
 906                         if (queueid == NULL)
 907                                 goto skip_item;
 908                         addr = strchr(queueid, ' ');
 909                         if (addr == NULL)
 910                                 goto skip_item;
 911                         *addr++ = 0;
 912                         if (fn != NULL)
 913                                 free(fn);
 914                         if (asprintf(&fn, "%s/%s", config->spooldir, queueid) < 0)
 915                                 goto skip_item;
 916                         /* Item has already been delivered? */
 917                         if (stat(fn, &st) != 0)
 918                                 continue;
 919                         if (add_recp(&itmqueue, addr, sender, 0) != 0)
 920                                 goto skip_item;
 921                         it = LIST_FIRST(&itmqueue.queue);
 922                         it->queuef = queuef;
 923                         it->queueid = queueid;
 924                         it->queuefn = fn;
 925                         it->locked = locked;
 926                         fn = NULL;
 927                 }
 928                 if (LIST_EMPTY(&itmqueue.queue)) {
 929                         warnx("queue file without items: `%s'", queuefn);
 930                         goto skip_item2;
 931                 }
 932                 hdrlen = ftell(queuef);
 933                 while ((it = LIST_FIRST(&itmqueue.queue)) != NULL) {
 934                         it->hdrlen = hdrlen;
 935                         LIST_REMOVE(it, next);
 936                         LIST_INSERT_HEAD(&queue->queue, it, next);
 937                 }
 938                 continue;
 939
 940 skip_item:
 941                 warn("reading queue: `%s'", queuefn);
 942 skip_item2:
 943                 if (sender != NULL)
 944                         free(sender);
 945                 if (queuefn != NULL)
 946                         free(queuefn);
 947                 if (fn != NULL)
 948                         free(fn);
 949                 if (queueid != NULL)
 950                         free(queueid);
 951                 close(fd);
 952         }
 953         closedir(spooldir);
 954         return;
 955
 956 fail:
 957         err(1, "reading queue");
 958 }
 959
 960 static void
 961 run_queue(struct queue *queue)
 962 {
 963         struct qitem *it;
 964
 965         if (LIST_EMPTY(&queue->queue))
 966                 return;
 967
 968         it = go_background(queue);
 969         deliver(it);
 970         /* NOTREACHED */
 971 }
 972
 973 static void
 974 show_queue(struct queue *queue)
 975 {
 976         struct qitem *it;
 977
 978         if (LIST_EMPTY(&queue->queue)) {
 979                 printf("Mail queue is empty\n");
 980                 return;
 981         }
 982
 983         LIST_FOREACH(it, &queue->queue, next) {
 984                 printf("\
 985 ID\t: %s%s\n\
 986 From\t: %s\n\
 987 To\t: %s\n--\n", it->queueid, it->locked? "*": "", it->sender, it->addr);
 988         }
 989 }
 990
 991 /*
 992  * TODO:
 993  *
 994  * - alias processing
 995  * - use group permissions
 996  * - proper sysexit codes
 997  */
 998
 999 int
1000 main(int argc, char **argv)
1001 {
1002         char *sender = NULL;
1003         char tag[255];
1004         struct qitem *it;
1005         struct queue queue;
1006         struct queue lqueue;
1007         int i, ch;
1008         int nodot = 0, doqueue = 0, showq = 0;
1009
1010         atexit(deltmp);
1011         LIST_INIT(&queue.queue);
1012         snprintf(tag, 254, "dma");
1013
1014         opterr = 0;
1015         while ((ch = getopt(argc, argv, "A:b:B:C:d:Df:F:h:iL:N:no:O:q:r:R:UV:vX:")) != -1) {
1016                 switch (ch) {
1017                 case 'A':
1018                         /* -AX is being ignored, except for -A{c,m} */
1019                         if (optarg[0] == 'c' || optarg[0] == 'm') {
1020                                 break;
1021                         }
1022                         /* else FALLTRHOUGH */
1023                 case 'b':
1024                         /* -bX is being ignored, except for -bp */
1025                         if (optarg[0] == 'p') {
1026                                 showq = 1;
1027                                 break;
1028                         }
1029                         /* else FALLTRHOUGH */
1030                 case 'D':
1031                         daemonize = 0;
1032                         break;
1033                 case 'L':
1034                         if (optarg != NULL)
1035                                 snprintf(tag, 254, "%s", optarg);
1036                         break;
1037                 case 'f':
1038                 case 'r':
1039                         sender = optarg;
1040                         break;
1041
1042                 case 'o':
1043                         /* -oX is being ignored, except for -oi */
1044                         if (optarg[0] != 'i')
1045                                 break;
1046                         /* else FALLTRHOUGH */
1047                 case 'O':
1048                         break;
1049                 case 'i':
1050                         nodot = 1;
1051                         break;
1052
1053                 case 'q':
1054                         doqueue = 1;
1055                         break;
1056
1057                 /* Ignored options */
1058                 case 'B':
1059                 case 'C':
1060                 case 'd':
1061                 case 'F':
1062                 case 'h':
1063                 case 'N':
1064                 case 'n':
1065                 case 'R':
1066                 case 'U':
1067                 case 'V':
1068                 case 'v':
1069                 case 'X':
1070                         break;
1071
1072                 default:
1073                         exit(1);
1074                 }
1075         }
1076         argc -= optind;
1077         argv += optind;
1078         opterr = 1;
1079
1080         openlog(tag, LOG_PID | LOG_PERROR, LOG_MAIL);
1081         set_username();
1082
1083         config = malloc(sizeof(struct config));
1084         if (config == NULL)
1085                 errx(1, "Cannot allocate enough memory");
1086
1087         memset(config, 0, sizeof(struct config));
1088         if (parse_conf(CONF_PATH, config) < 0) {
1089                 free(config);
1090                 errx(1, "reading config file");
1091         }
1092
1093         if (config->features & VIRTUAL)
1094                 if (parse_virtuser(config->virtualpath) < 0)
1095                         errx(1, "error reading virtual user file: %s",
1096                                 config->virtualpath);
1097
1098         if (parse_authfile(config->authpath) < 0)
1099                 err(1, "reading SMTP authentication file");
1100
1101         if (showq) {
1102                 if (argc != 0)
1103                         errx(1, "sending mail and displaying queue is"
1104                                 " mutually exclusive");
1105                 load_queue(&lqueue, 1);
1106                 show_queue(&lqueue);
1107                 return (0);
1108         }
1109
1110         if (doqueue) {
1111                 if (argc != 0)
1112                         errx(1, "sending mail and queue pickup is mutually exclusive");
1113                 load_queue(&lqueue, 0);
1114                 run_queue(&lqueue);
1115                 return (0);
1116         }
1117
1118         if (read_aliases() != 0)
1119                 err(1, "reading aliases");
1120
1121         if ((sender = set_from(sender)) == NULL)
1122                 err(1, "setting from address");
1123
1124         for (i = 0; i < argc; i++) {
1125                 if (add_recp(&queue, argv[i], sender, 1) != 0)
1126                         errx(1, "invalid recipient `%s'\n", argv[i]);
1127         }
1128
1129         if (LIST_EMPTY(&queue.queue))
1130                 errx(1, "no recipients");
1131
1132         if (gentempf(&queue) != 0)
1133                 err(1, "create temp file");
1134
1135         if (preparespool(&queue, sender) != 0)
1136                 err(1, "creating spools (1)");
1137
1138         if (readmail(&queue, sender, nodot) != 0)
1139                 err(1, "reading mail");
1140
1141         if (linkspool(&queue) != 0)
1142                 err(1, "creating spools (2)");
1143
1144         /* From here on the mail is safe. */
1145
1146         if (config->features & DEFER)
1147                 return (0);
1148
1149         it = go_background(&queue);
1150         deliver(it);
1151
1152         /* NOTREACHED */
1153         return (0);
1154 }