appl/push/push.c

   1 /*
   2  * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "push_locl.h"
  35 RCSID("$Id$");
  36
  37 #if defined(_AIX) && defined(STAT)
  38 /*
  39  * AIX defines STAT to 1 in sys/dir.h
  40  */
  41 #  undef STAT
  42 #endif
  43
  44 #ifdef KRB5
  45 static int use_v5 = -1;
  46 static krb5_context context;
  47 #endif
  48
  49 static char *port_str;
  50 static int verbose_level;
  51 static int do_fork;
  52 static int do_leave;
  53 static int do_version;
  54 static int do_help;
  55 static int do_from;
  56 static int do_count;
  57 static char *header_str;
  58
  59 struct getargs args[] = {
  60 #ifdef KRB5
  61     { "krb5",   '5', arg_flag,          &use_v5,        "Use Kerberos V5",
  62       NULL },
  63 #endif
  64     { "verbose",'v', arg_counter,       &verbose_level, "Verbose",
  65       NULL },
  66     { "fork",   'f', arg_flag,          &do_fork,       "Fork deleting proc",
  67       NULL },
  68     { "leave",  'l', arg_flag,          &do_leave,      "Leave mail on server",
  69       NULL },
  70     { "port",   'p', arg_string,        &port_str,      "Use this port",
  71       "number-or-service" },
  72     { "from",    0,  arg_flag,          &do_from,       "Behave like from",
  73       NULL },
  74     { "headers", 0,  arg_string,        &header_str,    "Headers to print", NULL },
  75     { "count", 'c',  arg_flag,          &do_count,      "Print number of messages", NULL},
  76     { "version", 0,  arg_flag,          &do_version,    "Print version",
  77       NULL },
  78     { "help",    0,  arg_flag,          &do_help,       NULL,
  79       NULL }
  80
  81 };
  82
  83 static void
  84 usage (int ret)
  85 {
  86     arg_printusage (args,
  87                     sizeof(args) / sizeof(args[0]),
  88                     NULL,
  89                     "[[{po:username[@hostname] | hostname[:username]}] ...] "
  90                     "filename");
  91     exit (ret);
  92 }
  93
  94 static int
  95 do_connect (const char *hostname, int port, int nodelay)
  96 {
  97     struct addrinfo *ai, *a;
  98     struct addrinfo hints;
  99     int error;
 100     int s = -1;
 101     char portstr[NI_MAXSERV];
 102
 103     memset (&hints, 0, sizeof(hints));
 104     hints.ai_socktype = SOCK_STREAM;
 105     hints.ai_protocol = IPPROTO_TCP;
 106
 107     snprintf (portstr, sizeof(portstr), "%u", ntohs(port));
 108
 109     error = getaddrinfo (hostname, portstr, &hints, &ai);
 110     if (error)
 111         errx (1, "getaddrinfo(%s): %s", hostname, gai_strerror(error));
 112
 113     for (a = ai; a != NULL; a = a->ai_next) {
 114         s = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
 115         if (s < 0)
 116             continue;
 117         if (connect (s, a->ai_addr, a->ai_addrlen) < 0) {
 118             warn ("connect(%s)", hostname);
 119             close (s);
 120             continue;
 121         }
 122         break;
 123     }
 124     freeaddrinfo (ai);
 125     if (a == NULL) {
 126         warnx ("failed to contact %s", hostname);
 127         return -1;
 128     }
 129
 130     if(setsockopt(s, IPPROTO_TCP, TCP_NODELAY,
 131                   (void *)&nodelay, sizeof(nodelay)) < 0)
 132         err (1, "setsockopt TCP_NODELAY");
 133     return s;
 134 }
 135
 136 typedef enum { INIT = 0, GREET, USER, PASS, STAT, RETR, TOP,
 137                DELE, XDELE, QUIT} pop_state;
 138
 139 static char *pop_state_string[] = {
 140     "INIT", "GREET", "USER", "PASS", "STAT", "RETR", "TOP",
 141     "DELE", "XDELE", "QUIT"
 142 };
 143
 144 #define PUSH_BUFSIZ 65536
 145
 146 #define STEP 16
 147
 148 struct write_state {
 149     struct iovec *iovecs;
 150     size_t niovecs, maxiovecs, allociovecs;
 151     int fd;
 152 };
 153
 154 static void
 155 write_state_init (struct write_state *w, int fd)
 156 {
 157 #ifdef UIO_MAXIOV
 158     w->maxiovecs = UIO_MAXIOV;
 159 #else
 160     w->maxiovecs = 16;
 161 #endif
 162     w->allociovecs = min(STEP, w->maxiovecs);
 163     w->niovecs = 0;
 164     w->iovecs = emalloc(w->allociovecs * sizeof(*w->iovecs));
 165     w->fd = fd;
 166 }
 167
 168 static void
 169 write_state_add (struct write_state *w, void *v, size_t len)
 170 {
 171     if(w->niovecs == w->allociovecs) {
 172         if(w->niovecs == w->maxiovecs) {
 173             if(writev (w->fd, w->iovecs, w->niovecs) < 0)
 174                 err(1, "writev");
 175             w->niovecs = 0;
 176         } else {
 177             w->allociovecs = min(w->allociovecs + STEP, w->maxiovecs);
 178             w->iovecs = erealloc (w->iovecs,
 179                                   w->allociovecs * sizeof(*w->iovecs));
 180         }
 181     }
 182     w->iovecs[w->niovecs].iov_base = v;
 183     w->iovecs[w->niovecs].iov_len  = len;
 184     ++w->niovecs;
 185 }
 186
 187 static void
 188 write_state_flush (struct write_state *w)
 189 {
 190     if (w->niovecs) {
 191         if (writev (w->fd, w->iovecs, w->niovecs) < 0)
 192             err (1, "writev");
 193         w->niovecs = 0;
 194     }
 195 }
 196
 197 static void
 198 write_state_destroy (struct write_state *w)
 199 {
 200     free (w->iovecs);
 201 }
 202
 203 static int
 204 doit(int s,
 205      const char *host,
 206      const char *user,
 207      const char *outfilename,
 208      const char *header_str,
 209      int leavep,
 210      int verbose,
 211      int forkp)
 212 {
 213     int ret;
 214     char out_buf[PUSH_BUFSIZ];
 215     int out_len = 0;
 216     char *in_buf;
 217     size_t in_buf_size;
 218     size_t in_len = 0;
 219     char *in_ptr;
 220     pop_state state = INIT;
 221     unsigned count = 0, bytes;
 222     unsigned asked_for = 0, retrieved = 0, asked_deleted = 0, deleted = 0;
 223     unsigned sent_xdele = 0;
 224     int out_fd;
 225     char from_line[128];
 226     ssize_t from_line_length;
 227     time_t now;
 228     struct write_state write_state;
 229     unsigned int numheaders = 1;
 230     char **headers = NULL;
 231     int i;
 232     char *tmp = NULL;
 233
 234     in_buf = emalloc(PUSH_BUFSIZ + 1);
 235     in_ptr = in_buf;
 236     in_buf_size = PUSH_BUFSIZ;
 237
 238     if (do_from) {
 239         char *tmp2;
 240
 241         tmp2 = tmp = estrdup(header_str);
 242
 243         out_fd = -1;
 244         if (verbose)
 245             fprintf (stderr, "%s@%s\n", user, host);
 246         while (*tmp != '\0') {
 247             tmp = strchr(tmp, ',');
 248             if (tmp == NULL)
 249                 break;
 250             tmp++;
 251             numheaders++;
 252         }
 253
 254         headers = emalloc(sizeof(char *) * (numheaders + 1));
 255         for (i = 0; i < numheaders; i++) {
 256             headers[i] = strtok_r(tmp2, ",", &tmp2);
 257         }
 258         headers[numheaders] = NULL;
 259     } else {
 260         out_fd = open(outfilename, O_WRONLY | O_APPEND | O_CREAT, 0666);
 261         if (out_fd < 0)
 262             err (1, "open %s", outfilename);
 263         if (verbose)
 264             fprintf (stderr, "%s@%s -> %s\n", user, host, outfilename);
 265     }
 266
 267     now = time(NULL);
 268     from_line_length = snprintf (from_line, sizeof(from_line),
 269                                  "From %s %s", "push", ctime(&now));
 270     if (from_line_length < 0 || from_line_length > sizeof(from_line))
 271         errx (1, "snprintf failed");
 272
 273     out_len = snprintf (out_buf, sizeof(out_buf),
 274                         "USER %s\r\nPASS hej\r\nSTAT\r\n",
 275                         user);
 276     if (out_len < 0 || out_len > sizeof(out_buf))
 277         errx (1, "snprintf failed");
 278     if (net_write (s, out_buf, out_len) != out_len)
 279         err (1, "write");
 280     if (verbose > 1)
 281         fprintf (stderr, "%s", out_buf);
 282
 283     if (!do_from)
 284         write_state_init (&write_state, out_fd);
 285
 286     while(state != QUIT) {
 287         fd_set readset, writeset;
 288
 289         FD_ZERO(&readset);
 290         FD_ZERO(&writeset);
 291         if (s >= FD_SETSIZE)
 292             errx (1, "fd too large");
 293         FD_SET(s,&readset);
 294
 295         if (verbose > 1)
 296             fprintf (stderr, "state: %s count: %d asked_for: %d "
 297                      "retrieved: %d asked_deleted: %d\n",
 298                      pop_state_string[state],
 299                      count, asked_for, retrieved, asked_deleted);
 300
 301         if (((state == STAT || state == RETR || state == TOP)
 302              && asked_for < count)
 303             || (state == XDELE && !sent_xdele)
 304             || (state == DELE && asked_deleted < count))
 305             FD_SET(s,&writeset);
 306         ret = select (s + 1, &readset, &writeset, NULL, NULL);
 307         if (ret < 0) {
 308             if (errno == EAGAIN)
 309                 continue;
 310             else
 311                 err (1, "select");
 312         }
 313
 314         if (FD_ISSET(s, &readset)) {
 315             char *beg, *p;
 316             size_t rem;
 317             int blank_line = 0;
 318
 319             if(in_len >= in_buf_size) {
 320                 char *tmp = erealloc(in_buf, in_buf_size + PUSH_BUFSIZ + 1);
 321                 in_ptr = tmp + (in_ptr - in_buf);
 322                 in_buf = tmp;
 323                 in_buf_size += PUSH_BUFSIZ;
 324             }
 325
 326             ret = read (s, in_ptr, in_buf_size - in_len);
 327             if (ret < 0)
 328                 err (1, "read");
 329             else if (ret == 0)
 330                 errx (1, "EOF during read");
 331
 332             in_len += ret;
 333             in_ptr += ret;
 334             *in_ptr = '\0';
 335
 336             beg = in_buf;
 337             rem = in_len;
 338             while(rem > 1
 339                   && (p = strstr(beg, "\r\n")) != NULL) {
 340                 if (state == TOP) {
 341                     char *copy = beg;
 342
 343                     for (i = 0; i < numheaders; i++) {
 344                         size_t len;
 345
 346                         len = min(p - copy + 1, strlen(headers[i]));
 347                         if (strncasecmp(copy, headers[i], len) == 0) {
 348                             fprintf (stdout, "%.*s\n", (int)(p - copy), copy);
 349                         }
 350                     }
 351                     if (beg[0] == '.' && beg[1] == '\r' && beg[2] == '\n') {
 352                         if (numheaders > 1)
 353                             fprintf (stdout, "\n");
 354                         state = STAT;
 355                         if (++retrieved == count) {
 356                             state = QUIT;
 357                             net_write (s, "QUIT\r\n", 6);
 358                             if (verbose > 1)
 359                                 fprintf (stderr, "QUIT\r\n");
 360                         }
 361                     }
 362                     rem -= p - beg + 2;
 363                     beg = p + 2;
 364                 } else if (state == RETR) {
 365                     char *copy = beg;
 366                     if (beg[0] == '.') {
 367                         if (beg[1] == '\r' && beg[2] == '\n') {
 368                             if(!blank_line)
 369                                 write_state_add(&write_state, "\n", 1);
 370                             state = STAT;
 371                             rem -= p - beg + 2;
 372                             beg = p + 2;
 373                             if (++retrieved == count) {
 374                                 write_state_flush (&write_state);
 375                                 if (fsync (out_fd) < 0)
 376                                     err (1, "fsync");
 377                                 close(out_fd);
 378                                 if (leavep) {
 379                                     state = QUIT;
 380                                     net_write (s, "QUIT\r\n", 6);
 381                                     if (verbose > 1)
 382                                         fprintf (stderr, "QUIT\r\n");
 383                                 } else {
 384                                     if (forkp) {
 385                                         pid_t pid;
 386
 387                                         pid = fork();
 388                                         if (pid < 0)
 389                                             warn ("fork");
 390                                         else if(pid != 0) {
 391                                             if(verbose)
 392                                                 fprintf (stderr,
 393                                                          "(exiting)");
 394                                             return 0;
 395                                         }
 396                                     }
 397
 398                                     state = XDELE;
 399                                     if (verbose)
 400                                         fprintf (stderr, "deleting... ");
 401                                 }
 402                             }
 403                             continue;
 404                         } else
 405                             ++copy;
 406                     }
 407                     *p = '\n';
 408                     if(blank_line &&
 409                        strncmp(copy, "From ", min(p - copy + 1, 5)) == 0)
 410                         write_state_add(&write_state, ">", 1);
 411                     write_state_add(&write_state, copy, p - copy + 1);
 412                     blank_line = (*copy == '\n');
 413                     rem -= p - beg + 2;
 414                     beg = p + 2;
 415                 } else if (rem >= 3 && strncmp (beg, "+OK", 3) == 0) {
 416                     if (state == STAT) {
 417                         if (!do_from)
 418                             write_state_add(&write_state,
 419                                             from_line, from_line_length);
 420                         blank_line = 0;
 421                         if (do_from)
 422                             state = TOP;
 423                         else
 424                             state = RETR;
 425                     } else if (state == XDELE) {
 426                         state = QUIT;
 427                         net_write (s, "QUIT\r\n", 6);
 428                         if (verbose > 1)
 429                             fprintf (stderr, "QUIT\r\n");
 430                         break;
 431                     } else if (state == DELE) {
 432                         if (++deleted == count) {
 433                             state = QUIT;
 434                             net_write (s, "QUIT\r\n", 6);
 435                             if (verbose > 1)
 436                                 fprintf (stderr, "QUIT\r\n");
 437                             break;
 438                         }
 439                     } else if (++state == STAT) {
 440                         if(sscanf (beg + 4, "%u %u", &count, &bytes) != 2)
 441                             errx(1, "Bad STAT-line: %.*s", (int)(p - beg), beg);
 442                         if (verbose) {
 443                             fprintf (stderr, "%u message(s) (%u bytes). "
 444                                      "fetching... ",
 445                                      count, bytes);
 446                             if (do_from)
 447                                 fprintf (stderr, "\n");
 448                         } else if (do_count) {
 449                             fprintf (stderr, "%u message(s) (%u bytes).\n",
 450                                      count, bytes);
 451                         }
 452                         if (count == 0) {
 453                             state = QUIT;
 454                             net_write (s, "QUIT\r\n", 6);
 455                             if (verbose > 1)
 456                                 fprintf (stderr, "QUIT\r\n");
 457                             break;
 458                         }
 459                     }
 460
 461                     rem -= p - beg + 2;
 462                     beg = p + 2;
 463                 } else {
 464                     if(state == XDELE) {
 465                         state = DELE;
 466                         rem -= p - beg + 2;
 467                         beg = p + 2;
 468                     } else
 469                         errx (1, "Bad response: %.*s", (int)(p - beg), beg);
 470                 }
 471             }
 472             if (!do_from)
 473                 write_state_flush (&write_state);
 474
 475             memmove (in_buf, beg, rem);
 476             in_len = rem;
 477             in_ptr = in_buf + rem;
 478         }
 479         if (FD_ISSET(s, &writeset)) {
 480             if ((state == STAT && !do_from) || state == RETR)
 481                 out_len = snprintf (out_buf, sizeof(out_buf),
 482                                     "RETR %u\r\n", ++asked_for);
 483             else if ((state == STAT && do_from) || state == TOP)
 484                 out_len = snprintf (out_buf, sizeof(out_buf),
 485                                     "TOP %u 0\r\n", ++asked_for);
 486             else if(state == XDELE) {
 487                 out_len = snprintf(out_buf, sizeof(out_buf),
 488                                    "XDELE %u %u\r\n", 1, count);
 489                 sent_xdele++;
 490             }
 491             else if(state == DELE)
 492                 out_len = snprintf (out_buf, sizeof(out_buf),
 493                                     "DELE %u\r\n", ++asked_deleted);
 494             if (out_len < 0 || out_len > sizeof(out_buf))
 495                 errx (1, "snprintf failed");
 496             if (net_write (s, out_buf, out_len) != out_len)
 497                 err (1, "write");
 498             if (verbose > 1)
 499                 fprintf (stderr, "%s", out_buf);
 500         }
 501     }
 502     if (verbose)
 503         fprintf (stderr, "Done\n");
 504     if (do_from) {
 505         free (tmp);
 506         free (headers);
 507     } else {
 508         write_state_destroy (&write_state);
 509     }
 510     return 0;
 511 }
 512
 513 #ifdef KRB5
 514 static int
 515 do_v5 (const char *host,
 516        int port,
 517        const char *user,
 518        const char *filename,
 519        const char *header_str,
 520        int leavep,
 521        int verbose,
 522        int forkp)
 523 {
 524     krb5_error_code ret;
 525     krb5_auth_context auth_context = NULL;
 526     krb5_principal server;
 527     const char *estr;
 528     int s;
 529
 530     s = do_connect (host, port, 1);
 531     if (s < 0)
 532         return 1;
 533
 534     ret = krb5_sname_to_principal (context,
 535                                    host,
 536                                    "pop",
 537                                    KRB5_NT_SRV_HST,
 538                                    &server);
 539     if (ret) {
 540         estr = krb5_get_error_message(context, ret);
 541         warnx ("krb5_sname_to_principal: %s", estr);
 542         krb5_free_error_message(context, estr);
 543         return 1;
 544     }
 545
 546     ret = krb5_sendauth (context,
 547                          &auth_context,
 548                          &s,
 549                          "KPOPV1.0",
 550                          NULL,
 551                          server,
 552                          0,
 553                          NULL,
 554                          NULL,
 555                          NULL,
 556                          NULL,
 557                          NULL,
 558                          NULL);
 559     krb5_free_principal (context, server);
 560     if (ret) {
 561         estr = krb5_get_error_message(context, ret);
 562         warnx ("krb5_sendauth: %s", estr);
 563         krb5_free_error_message(context, estr);
 564         return 1;
 565     }
 566     return doit (s, host, user, filename, header_str, leavep, verbose, forkp);
 567 }
 568 #endif
 569
 570 #ifdef HESIOD
 571
 572 #ifdef HESIOD_INTERFACES
 573
 574 static char *
 575 hesiod_get_pobox (const char **user)
 576 {
 577     void *context;
 578     struct hesiod_postoffice *hpo;
 579     char *ret = NULL;
 580
 581     if(hesiod_init (&context) != 0)
 582         err (1, "hesiod_init");
 583
 584     hpo = hesiod_getmailhost (context, *user);
 585     if (hpo == NULL) {
 586         warn ("hesiod_getmailhost %s", *user);
 587     } else {
 588         if (strcasecmp(hpo->hesiod_po_type, "pop") != 0)
 589             errx (1, "Unsupported po type %s", hpo->hesiod_po_type);
 590
 591         ret = estrdup(hpo->hesiod_po_host);
 592         *user = estrdup(hpo->hesiod_po_name);
 593         hesiod_free_postoffice (context, hpo);
 594     }
 595     hesiod_end (context);
 596     return ret;
 597 }
 598
 599 #else /* !HESIOD_INTERFACES */
 600
 601 static char *
 602 hesiod_get_pobox (const char **user)
 603 {
 604     char *ret = NULL;
 605     struct hes_postoffice *hpo;
 606
 607     hpo = hes_getmailhost (*user);
 608     if (hpo == NULL) {
 609         warn ("hes_getmailhost %s", *user);
 610     } else {
 611         if (strcasecmp(hpo->po_type, "pop") != 0)
 612             errx (1, "Unsupported po type %s", hpo->po_type);
 613
 614         ret = estrdup(hpo->po_host);
 615         *user = estrdup(hpo->po_name);
 616     }
 617     return ret;
 618 }
 619
 620 #endif /* HESIOD_INTERFACES */
 621
 622 #endif /* HESIOD */
 623
 624 static char *
 625 get_pobox (const char **user)
 626 {
 627     char *ret = NULL;
 628
 629 #ifdef HESIOD
 630     ret = hesiod_get_pobox (user);
 631 #endif
 632
 633     if (ret == NULL)
 634         ret = getenv("MAILHOST");
 635     if (ret == NULL)
 636         errx (1, "MAILHOST not set");
 637     return ret;
 638 }
 639
 640 static void
 641 parse_pobox (char *a0, const char **host, const char **user)
 642 {
 643     const char *h, *u;
 644     char *p;
 645     int po = 0;
 646
 647     if (a0 == NULL) {
 648
 649         *user = getenv ("USERNAME");
 650         if (*user == NULL) {
 651             struct passwd *pwd = getpwuid (getuid ());
 652
 653             if (pwd == NULL)
 654                 errx (1, "Who are you?");
 655             *user = estrdup (pwd->pw_name);
 656         }
 657         *host = get_pobox (user);
 658         return;
 659     }
 660
 661     /* if the specification starts with po:, remember this information */
 662     if(strncmp(a0, "po:", 3) == 0) {
 663         a0 += 3;
 664         po++;
 665     }
 666     /* if there is an `@', the hostname is after it, otherwise at the
 667        beginning of the string */
 668     p = strchr(a0, '@');
 669     if(p != NULL) {
 670         *p++ = '\0';
 671         h = p;
 672     } else {
 673         h = a0;
 674     }
 675     /* if there is a `:', the username comes before it, otherwise at
 676        the beginning of the string */
 677     p = strchr(a0, ':');
 678     if(p != NULL) {
 679         *p++ = '\0';
 680         u = p;
 681     } else {
 682         u = a0;
 683     }
 684     if(h == u) {
 685         /* some inconsistent compatibility with various mailers */
 686         if(po) {
 687             h = get_pobox (&u);
 688         } else {
 689             u = get_default_username ();
 690             if (u == NULL)
 691                 errx (1, "Who are you?");
 692         }
 693     }
 694     *host = h;
 695     *user = u;
 696 }
 697
 698 int
 699 main(int argc, char **argv)
 700 {
 701     int port = 0;
 702     int optind = 0;
 703     int ret = 1;
 704     const char *host, *user, *filename = NULL;
 705     char *pobox = NULL;
 706
 707     setprogname (argv[0]);
 708
 709 #ifdef KRB5
 710     {
 711         krb5_error_code ret;
 712
 713         ret = krb5_init_context (&context);
 714         if (ret)
 715             errx (1, "krb5_init_context failed: %d", ret);
 716     }
 717 #endif
 718
 719     if (getarg (args, sizeof(args) / sizeof(args[0]), argc, argv,
 720                 &optind))
 721         usage (1);
 722
 723     argc -= optind;
 724     argv += optind;
 725
 726     if (do_help)
 727         usage (0);
 728
 729     if (do_version) {
 730         print_version(NULL);
 731         return 0;
 732     }
 733
 734     if (do_from && header_str == NULL)
 735         header_str = "From:";
 736     else if (header_str != NULL)
 737         do_from = 1;
 738
 739     if (do_from) {
 740         if (argc == 0)
 741             pobox = NULL;
 742         else if (argc == 1)
 743             pobox = argv[0];
 744         else
 745             usage (1);
 746     } else {
 747         if (argc == 1) {
 748             filename = argv[0];
 749             pobox    = NULL;
 750         } else if (argc == 2) {
 751             filename = argv[1];
 752             pobox    = argv[0];
 753         } else
 754             usage (1);
 755     }
 756
 757     if (port_str) {
 758         struct servent *s = roken_getservbyname (port_str, "tcp");
 759
 760         if (s)
 761             port = s->s_port;
 762         else {
 763             char *ptr;
 764
 765             port = strtol (port_str, &ptr, 10);
 766             if (port == 0 && ptr == port_str)
 767                 errx (1, "Bad port `%s'", port_str);
 768             port = htons(port);
 769         }
 770     }
 771     if (port == 0) {
 772 #ifdef KRB5
 773         port = krb5_getportbyname (context, "kpop", "tcp", 1109);
 774 #else
 775 #error must define KRB5
 776 #endif
 777     }
 778
 779     parse_pobox (pobox, &host, &user);
 780
 781 #ifdef KRB5
 782     if (ret && use_v5) {
 783         ret = do_v5 (host, port, user, filename, header_str,
 784                      do_leave, verbose_level, do_fork);
 785     }
 786 #endif
 787     return ret;
 788 }