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 #ifdef KRB4
  38 static int use_v4 = -1;
  39 #endif
  40
  41 #ifdef KRB5
  42 static int use_v5 = -1;
  43 static krb5_context context;
  44 #endif
  45
  46 static char *port_str;
  47 static int verbose_level;
  48 static int do_fork;
  49 static int do_leave;
  50 static int do_version;
  51 static int do_help;
  52 static int do_from;
  53 static int do_count;
  54 static char *header_str;
  55
  56 struct getargs args[] = {
  57 #ifdef KRB4
  58     { "krb4",   '4', arg_flag,          &use_v4,        "Use Kerberos V4",
  59       NULL },
  60 #endif
  61 #ifdef KRB5
  62     { "krb5",   '5', arg_flag,          &use_v5,        "Use Kerberos V5",
  63       NULL },
  64 #endif
  65     { "verbose",'v', arg_counter,       &verbose_level, "Verbose",
  66       NULL },
  67     { "fork",   'f', arg_flag,          &do_fork,       "Fork deleting proc",
  68       NULL },
  69     { "leave",  'l', arg_flag,          &do_leave,      "Leave mail on server",
  70       NULL },
  71     { "port",   'p', arg_string,        &port_str,      "Use this port",
  72       "number-or-service" },
  73     { "from",    0,  arg_flag,          &do_from,       "Behave like from",
  74       NULL },
  75     { "headers", 0,  arg_string,        &header_str,    "Headers to print", NULL },
  76     { "count", 'c',  arg_flag,          &do_count,      "Print number of messages", NULL},
  77     { "version", 0,  arg_flag,          &do_version,    "Print version",
  78       NULL },
  79     { "help",    0,  arg_flag,          &do_help,       NULL,
  80       NULL }
  81
  82 };
  83
  84 static void
  85 usage (int ret)
  86 {
  87     arg_printusage (args,
  88                     sizeof(args) / sizeof(args[0]),
  89                     NULL,
  90                     "[[{po:username[@hostname] | hostname[:username]}] ...] "
  91                     "filename");
  92     exit (ret);
  93 }
  94
  95 static int
  96 do_connect (const char *hostname, int port, int nodelay)
  97 {
  98     struct addrinfo *ai, *a;
  99     struct addrinfo hints;
 100     int error;
 101     int s = -1;
 102     char portstr[NI_MAXSERV];
 103
 104     memset (&hints, 0, sizeof(hints));
 105     hints.ai_socktype = SOCK_STREAM;
 106     hints.ai_protocol = IPPROTO_TCP;
 107
 108     snprintf (portstr, sizeof(portstr), "%u", ntohs(port));
 109
 110     error = getaddrinfo (hostname, portstr, &hints, &ai);
 111     if (error)
 112         errx (1, "getaddrinfo(%s): %s", hostname, gai_strerror(error));
 113
 114     for (a = ai; a != NULL; a = a->ai_next) {
 115         s = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
 116         if (s < 0)
 117             continue;
 118         if (connect (s, a->ai_addr, a->ai_addrlen) < 0) {
 119             warn ("connect(%s)", hostname);
 120             close (s);
 121             continue;
 122         }
 123         break;
 124     }
 125     freeaddrinfo (ai);
 126     if (a == NULL) {
 127         warnx ("failed to contact %s", hostname);
 128         return -1;
 129     }
 130
 131     if(setsockopt(s, IPPROTO_TCP, TCP_NODELAY,
 132                   (void *)&nodelay, sizeof(nodelay)) < 0)
 133         err (1, "setsockopt TCP_NODELAY");
 134     return s;
 135 }
 136
 137 typedef enum { INIT = 0, GREET, USER, PASS, STAT, RETR, TOP,
 138                DELE, XDELE, QUIT} pop_state;
 139
 140 static char *pop_state_string[] = {
 141     "INIT", "GREET", "USER", "PASS", "STAT", "RETR", "TOP",
 142     "DELE", "XDELE", "QUIT"
 143 };
 144
 145 #define PUSH_BUFSIZ 65536
 146
 147 #define STEP 16
 148
 149 struct write_state {
 150     struct iovec *iovecs;
 151     size_t niovecs, maxiovecs, allociovecs;
 152     int fd;
 153 };
 154
 155 static void
 156 write_state_init (struct write_state *w, int fd)
 157 {
 158 #ifdef UIO_MAXIOV
 159     w->maxiovecs = UIO_MAXIOV;
 160 #else
 161     w->maxiovecs = 16;
 162 #endif
 163     w->allociovecs = min(STEP, w->maxiovecs);
 164     w->niovecs = 0;
 165     w->iovecs = emalloc(w->allociovecs * sizeof(*w->iovecs));
 166     w->fd = fd;
 167 }
 168
 169 static void
 170 write_state_add (struct write_state *w, void *v, size_t len)
 171 {
 172     if(w->niovecs == w->allociovecs) {
 173         if(w->niovecs == w->maxiovecs) {
 174             if(writev (w->fd, w->iovecs, w->niovecs) < 0)
 175                 err(1, "writev");
 176             w->niovecs = 0;
 177         } else {
 178             w->allociovecs = min(w->allociovecs + STEP, w->maxiovecs);
 179             w->iovecs = erealloc (w->iovecs,
 180                                   w->allociovecs * sizeof(*w->iovecs));
 181         }
 182     }
 183     w->iovecs[w->niovecs].iov_base = v;
 184     w->iovecs[w->niovecs].iov_len  = len;
 185     ++w->niovecs;
 186 }
 187
 188 static void
 189 write_state_flush (struct write_state *w)
 190 {
 191     if (w->niovecs) {
 192         if (writev (w->fd, w->iovecs, w->niovecs) < 0)
 193             err (1, "writev");
 194         w->niovecs = 0;
 195     }
 196 }
 197
 198 static void
 199 write_state_destroy (struct write_state *w)
 200 {
 201     free (w->iovecs);
 202 }
 203
 204 static int
 205 doit(int s,
 206      const char *host,
 207      const char *user,
 208      const char *outfilename,
 209      const char *header_str,
 210      int leavep,
 211      int verbose,
 212      int forkp)
 213 {
 214     int ret;
 215     char out_buf[PUSH_BUFSIZ];
 216     int out_len = 0;
 217     char *in_buf;
 218     size_t in_buf_size;
 219     size_t in_len = 0;
 220     char *in_ptr;
 221     pop_state state = INIT;
 222     unsigned count, bytes;
 223     unsigned asked_for = 0, retrieved = 0, asked_deleted = 0, deleted = 0;
 224     unsigned sent_xdele = 0;
 225     int out_fd;
 226     char from_line[128];
 227     size_t from_line_length;
 228     time_t now;
 229     struct write_state write_state;
 230     int numheaders = 1;
 231     char **headers = NULL;
 232     int i;
 233     char *tmp = NULL;
 234
 235     in_buf = emalloc(PUSH_BUFSIZ + 1);
 236     in_ptr = in_buf;
 237     in_buf_size = PUSH_BUFSIZ;
 238
 239     if (do_from) {
 240         char *tmp2;
 241
 242         tmp2 = tmp = estrdup(header_str);
 243
 244         out_fd = -1;
 245         if (verbose)
 246             fprintf (stderr, "%s@%s\n", user, host);
 247         while (*tmp != '\0') {
 248             tmp = strchr(tmp, ',');
 249             if (tmp == NULL)
 250                 break;
 251             tmp++;
 252             numheaders++;
 253         }
 254
 255         headers = emalloc(sizeof(char *) * (numheaders + 1));
 256         for (i = 0; i < numheaders; i++) {
 257             headers[i] = strtok_r(tmp2, ",", &tmp2);
 258         }
 259         headers[numheaders] = NULL;
 260     } else {
 261         out_fd = open(outfilename, O_WRONLY | O_APPEND | O_CREAT, 0666);
 262         if (out_fd < 0)
 263             err (1, "open %s", outfilename);
 264         if (verbose)
 265             fprintf (stderr, "%s@%s -> %s\n", user, host, outfilename);
 266     }
 267
 268     now = time(NULL);
 269     from_line_length = snprintf (from_line, sizeof(from_line),
 270                                  "From %s %s", "push", ctime(&now));
 271
 272     out_len = snprintf (out_buf, sizeof(out_buf),
 273                         "USER %s\r\nPASS hej\r\nSTAT\r\n",
 274                         user);
 275     if (out_len < 0)
 276         errx (1, "snprintf failed");
 277     if (net_write (s, out_buf, out_len) != out_len)
 278         err (1, "write");
 279     if (verbose > 1)
 280         fprintf (stderr, "%s", out_buf);
 281
 282     if (!do_from)
 283         write_state_init (&write_state, out_fd);
 284
 285     while(state != QUIT) {
 286         fd_set readset, writeset;
 287
 288         FD_ZERO(&readset);
 289         FD_ZERO(&writeset);
 290         if (s >= FD_SETSIZE)
 291             errx (1, "fd too large");
 292         FD_SET(s,&readset);
 293
 294         if (verbose > 1)
 295             fprintf (stderr, "state: %s count: %d asked_for: %d "
 296                      "retrieved: %d asked_deleted: %d\n",
 297                      pop_state_string[state],
 298                      count, asked_for, retrieved, asked_deleted);
 299
 300         if (((state == STAT || state == RETR || state == TOP)
 301              && asked_for < count)
 302             || (state == XDELE && !sent_xdele)
 303             || (state == DELE && asked_deleted < count))
 304             FD_SET(s,&writeset);
 305         ret = select (s + 1, &readset, &writeset, NULL, NULL);
 306         if (ret < 0) {
 307             if (errno == EAGAIN)
 308                 continue;
 309             else
 310                 err (1, "select");
 311         }
 312
 313         if (FD_ISSET(s, &readset)) {
 314             char *beg, *p;
 315             size_t rem;
 316             int blank_line = 0;
 317
 318             if(in_len >= in_buf_size) {
 319                 char *tmp = erealloc(in_buf, in_buf_size + PUSH_BUFSIZ + 1);
 320                 in_ptr = tmp + (in_ptr - in_buf);
 321                 in_buf = tmp;
 322                 in_buf_size += PUSH_BUFSIZ;
 323             }
 324
 325             ret = read (s, in_ptr, in_buf_size - in_len);
 326             if (ret < 0)
 327                 err (1, "read");
 328             else if (ret == 0)
 329                 errx (1, "EOF during read");
 330
 331             in_len += ret;
 332             in_ptr += ret;
 333             *in_ptr = '\0';
 334
 335             beg = in_buf;
 336             rem = in_len;
 337             while(rem > 1
 338                   && (p = strstr(beg, "\r\n")) != NULL) {
 339                 if (state == TOP) {
 340                     char *copy = beg;
 341
 342                     for (i = 0; i < numheaders; i++) {
 343                         size_t len;
 344
 345                         len = min(p - copy + 1, strlen(headers[i]));
 346                         if (strncasecmp(copy, headers[i], len) == 0) {
 347                             fprintf (stdout, "%.*s\n", (int)(p - copy), copy);
 348                         }
 349                     }
 350                     if (beg[0] == '.' && beg[1] == '\r' && beg[2] == '\n') {
 351                         if (numheaders > 1)
 352                             fprintf (stdout, "\n");
 353                         state = STAT;
 354                         if (++retrieved == count) {
 355                             state = QUIT;
 356                             net_write (s, "QUIT\r\n", 6);
 357                             if (verbose > 1)
 358                                 fprintf (stderr, "QUIT\r\n");
 359                         }
 360                     }
 361                     rem -= p - beg + 2;
 362                     beg = p + 2;
 363                 } else if (state == RETR) {
 364                     char *copy = beg;
 365                     if (beg[0] == '.') {
 366                         if (beg[1] == '\r' && beg[2] == '\n') {
 367                             if(!blank_line)
 368                                 write_state_add(&write_state, "\n", 1);
 369                             state = STAT;
 370                             rem -= p - beg + 2;
 371                             beg = p + 2;
 372                             if (++retrieved == count) {
 373                                 write_state_flush (&write_state);
 374                                 if (fsync (out_fd) < 0)
 375                                     err (1, "fsync");
 376                                 close(out_fd);
 377                                 if (leavep) {
 378                                     state = QUIT;
 379                                     net_write (s, "QUIT\r\n", 6);
 380                                     if (verbose > 1)
 381                                         fprintf (stderr, "QUIT\r\n");
 382                                 } else {
 383                                     if (forkp) {
 384                                         pid_t pid;
 385
 386                                         pid = fork();
 387                                         if (pid < 0)
 388                                             warn ("fork");
 389                                         else if(pid != 0) {
 390                                             if(verbose)
 391                                                 fprintf (stderr,
 392                                                          "(exiting)");
 393                                             return 0;
 394                                         }
 395                                     }
 396
 397                                     state = XDELE;
 398                                     if (verbose)
 399                                         fprintf (stderr, "deleting... ");
 400                                 }
 401                             }
 402                             continue;
 403                         } else
 404                             ++copy;
 405                     }
 406                     *p = '\n';
 407                     if(blank_line &&
 408                        strncmp(copy, "From ", min(p - copy + 1, 5)) == 0)
 409                         write_state_add(&write_state, ">", 1);
 410                     write_state_add(&write_state, copy, p - copy + 1);
 411                     blank_line = (*copy == '\n');
 412                     rem -= p - beg + 2;
 413                     beg = p + 2;
 414                 } else if (rem >= 3 && strncmp (beg, "+OK", 3) == 0) {
 415                     if (state == STAT) {
 416                         if (!do_from)
 417                             write_state_add(&write_state,
 418                                             from_line, from_line_length);
 419                         blank_line = 0;
 420                         if (do_from)
 421                             state = TOP;
 422                         else
 423                             state = RETR;
 424                     } else if (state == XDELE) {
 425                         state = QUIT;
 426                         net_write (s, "QUIT\r\n", 6);
 427                         if (verbose > 1)
 428                             fprintf (stderr, "QUIT\r\n");
 429                         break;
 430                     } else if (state == DELE) {
 431                         if (++deleted == count) {
 432                             state = QUIT;
 433                             net_write (s, "QUIT\r\n", 6);
 434                             if (verbose > 1)
 435                                 fprintf (stderr, "QUIT\r\n");
 436                             break;
 437                         }
 438                     } else if (++state == STAT) {
 439                         if(sscanf (beg + 4, "%u %u", &count, &bytes) != 2)
 440                             errx(1, "Bad STAT-line: %.*s", (int)(p - beg), beg);
 441                         if (verbose) {
 442                             fprintf (stderr, "%u message(s) (%u bytes). "
 443                                      "fetching... ",
 444                                      count, bytes);
 445                             if (do_from)
 446                                 fprintf (stderr, "\n");
 447                         } else if (do_count) {
 448                             fprintf (stderr, "%u message(s) (%u bytes).\n",
 449                                      count, bytes);
 450                         }
 451                         if (count == 0) {
 452                             state = QUIT;
 453                             net_write (s, "QUIT\r\n", 6);
 454                             if (verbose > 1)
 455                                 fprintf (stderr, "QUIT\r\n");
 456                             break;
 457                         }
 458                     }
 459
 460                     rem -= p - beg + 2;
 461                     beg = p + 2;
 462                 } else {
 463                     if(state == XDELE) {
 464                         state = DELE;
 465                         rem -= p - beg + 2;
 466                         beg = p + 2;
 467                     } else
 468                         errx (1, "Bad response: %.*s", (int)(p - beg), beg);
 469                 }
 470             }
 471             if (!do_from)
 472                 write_state_flush (&write_state);
 473
 474             memmove (in_buf, beg, rem);
 475             in_len = rem;
 476             in_ptr = in_buf + rem;
 477         }
 478         if (FD_ISSET(s, &writeset)) {
 479             if ((state == STAT && !do_from) || state == RETR)
 480                 out_len = snprintf (out_buf, sizeof(out_buf),
 481                                     "RETR %u\r\n", ++asked_for);
 482             else if ((state == STAT && do_from) || state == TOP)
 483                 out_len = snprintf (out_buf, sizeof(out_buf),
 484                                     "TOP %u 0\r\n", ++asked_for);
 485             else if(state == XDELE) {
 486                 out_len = snprintf(out_buf, sizeof(out_buf),
 487                                    "XDELE %u %u\r\n", 1, count);
 488                 sent_xdele++;
 489             }
 490             else if(state == DELE)
 491                 out_len = snprintf (out_buf, sizeof(out_buf),
 492                                     "DELE %u\r\n", ++asked_deleted);
 493             if (out_len < 0)
 494                 errx (1, "snprintf failed");
 495             if (net_write (s, out_buf, out_len) != out_len)
 496                 err (1, "write");
 497             if (verbose > 1)
 498                 fprintf (stderr, "%s", out_buf);
 499         }
 500     }
 501     if (verbose)
 502         fprintf (stderr, "Done\n");
 503     if (do_from) {
 504         free (tmp);
 505         free (headers);
 506     } else {
 507         write_state_destroy (&write_state);
 508     }
 509     return 0;
 510 }
 511
 512 #ifdef KRB5
 513 static int
 514 do_v5 (const char *host,
 515        int port,
 516        const char *user,
 517        const char *filename,
 518        const char *header_str,
 519        int leavep,
 520        int verbose,
 521        int forkp)
 522 {
 523     krb5_error_code ret;
 524     krb5_auth_context auth_context = NULL;
 525     krb5_principal server;
 526     int s;
 527
 528     s = do_connect (host, port, 1);
 529     if (s < 0)
 530         return 1;
 531
 532     ret = krb5_sname_to_principal (context,
 533                                    host,
 534                                    "pop",
 535                                    KRB5_NT_SRV_HST,
 536                                    &server);
 537     if (ret) {
 538         warnx ("krb5_sname_to_principal: %s",
 539                krb5_get_err_text (context, ret));
 540         return 1;
 541     }
 542
 543     ret = krb5_sendauth (context,
 544                          &auth_context,
 545                          &s,
 546                          "KPOPV1.0",
 547                          NULL,
 548                          server,
 549                          0,
 550                          NULL,
 551                          NULL,
 552                          NULL,
 553                          NULL,
 554                          NULL,
 555                          NULL);
 556     krb5_free_principal (context, server);
 557     if (ret) {
 558         warnx ("krb5_sendauth: %s",
 559                krb5_get_err_text (context, ret));
 560         return 1;
 561     }
 562     return doit (s, host, user, filename, header_str, leavep, verbose, forkp);
 563 }
 564 #endif
 565
 566 #ifdef KRB4
 567 static int
 568 do_v4 (const char *host,
 569        int port,
 570        const char *user,
 571        const char *filename,
 572        const char *header_str,
 573        int leavep,
 574        int verbose,
 575        int forkp)
 576 {
 577     KTEXT_ST ticket;
 578     MSG_DAT msg_data;
 579     CREDENTIALS cred;
 580     des_key_schedule sched;
 581     int s;
 582     int ret;
 583
 584     s = do_connect (host, port, 1);
 585     if (s < 0)
 586         return 1;
 587     ret = krb_sendauth(0,
 588                        s,
 589                        &ticket,
 590                        "pop",
 591                        (char *)host,
 592                        krb_realmofhost(host),
 593                        getpid(),
 594                        &msg_data,
 595                        &cred,
 596                        sched,
 597                        NULL,
 598                        NULL,
 599                        "KPOPV0.1");
 600     if(ret) {
 601         warnx("krb_sendauth: %s", krb_get_err_text(ret));
 602         return 1;
 603     }
 604     return doit (s, host, user, filename, header_str, leavep, verbose, forkp);
 605 }
 606 #endif /* KRB4 */
 607
 608 #ifdef HESIOD
 609
 610 #ifdef HESIOD_INTERFACES
 611
 612 static char *
 613 hesiod_get_pobox (const char **user)
 614 {
 615     void *context;
 616     struct hesiod_postoffice *hpo;
 617     char *ret = NULL;
 618
 619     if(hesiod_init (&context) != 0)
 620         err (1, "hesiod_init");
 621
 622     hpo = hesiod_getmailhost (context, *user);
 623     if (hpo == NULL) {
 624         warn ("hesiod_getmailhost %s", *user);
 625     } else {
 626         if (strcasecmp(hpo->hesiod_po_type, "pop") != 0)
 627             errx (1, "Unsupported po type %s", hpo->hesiod_po_type);
 628
 629         ret = estrdup(hpo->hesiod_po_host);
 630         *user = estrdup(hpo->hesiod_po_name);
 631         hesiod_free_postoffice (context, hpo);
 632     }
 633     hesiod_end (context);
 634     return ret;
 635 }
 636
 637 #else /* !HESIOD_INTERFACES */
 638
 639 static char *
 640 hesiod_get_pobox (const char **user)
 641 {
 642     char *ret = NULL;
 643     struct hes_postoffice *hpo;
 644
 645     hpo = hes_getmailhost (*user);
 646     if (hpo == NULL) {
 647         warn ("hes_getmailhost %s", *user);
 648     } else {
 649         if (strcasecmp(hpo->po_type, "pop") != 0)
 650             errx (1, "Unsupported po type %s", hpo->po_type);
 651
 652         ret = estrdup(hpo->po_host);
 653         *user = estrdup(hpo->po_name);
 654     }
 655     return ret;
 656 }
 657
 658 #endif /* HESIOD_INTERFACES */
 659
 660 #endif /* HESIOD */
 661
 662 static char *
 663 get_pobox (const char **user)
 664 {
 665     char *ret = NULL;
 666
 667 #ifdef HESIOD
 668     ret = hesiod_get_pobox (user);
 669 #endif
 670
 671     if (ret == NULL)
 672         ret = getenv("MAILHOST");
 673     if (ret == NULL)
 674         errx (1, "MAILHOST not set");
 675     return ret;
 676 }
 677
 678 static void
 679 parse_pobox (char *a0, const char **host, const char **user)
 680 {
 681     const char *h, *u;
 682     char *p;
 683     int po = 0;
 684
 685     if (a0 == NULL) {
 686
 687         *user = getenv ("USERNAME");
 688         if (*user == NULL) {
 689             struct passwd *pwd = getpwuid (getuid ());
 690
 691             if (pwd == NULL)
 692                 errx (1, "Who are you?");
 693             *user = estrdup (pwd->pw_name);
 694         }
 695         *host = get_pobox (user);
 696         return;
 697     }
 698
 699     /* if the specification starts with po:, remember this information */
 700     if(strncmp(a0, "po:", 3) == 0) {
 701         a0 += 3;
 702         po++;
 703     }
 704     /* if there is an `@', the hostname is after it, otherwise at the
 705        beginning of the string */
 706     p = strchr(a0, '@');
 707     if(p != NULL) {
 708         *p++ = '\0';
 709         h = p;
 710     } else {
 711         h = a0;
 712     }
 713     /* if there is a `:', the username comes before it, otherwise at
 714        the beginning of the string */
 715     p = strchr(a0, ':');
 716     if(p != NULL) {
 717         *p++ = '\0';
 718         u = p;
 719     } else {
 720         u = a0;
 721     }
 722     if(h == u) {
 723         /* some inconsistent compatibility with various mailers */
 724         if(po) {
 725             h = get_pobox (&u);
 726         } else {
 727             u = get_default_username ();
 728             if (u == NULL)
 729                 errx (1, "Who are you?");
 730         }
 731     }
 732     *host = h;
 733     *user = u;
 734 }
 735
 736 int
 737 main(int argc, char **argv)
 738 {
 739     int port = 0;
 740     int optind = 0;
 741     int ret = 1;
 742     const char *host, *user, *filename = NULL;
 743     char *pobox = NULL;
 744
 745     setprogname (argv[0]);
 746
 747 #ifdef KRB5
 748     {
 749         krb5_error_code ret;
 750
 751         ret = krb5_init_context (&context);
 752         if (ret)
 753             errx (1, "krb5_init_context failed: %d", ret);
 754     }
 755 #endif
 756
 757     if (getarg (args, sizeof(args) / sizeof(args[0]), argc, argv,
 758                 &optind))
 759         usage (1);
 760
 761     argc -= optind;
 762     argv += optind;
 763
 764 #if defined(KRB4) && defined(KRB5)
 765     if(use_v4 == -1 && use_v5 == 1)
 766         use_v4 = 0;
 767     if(use_v5 == -1 && use_v4 == 1)
 768         use_v5 = 0;
 769 #endif
 770
 771     if (do_help)
 772         usage (0);
 773
 774     if (do_version) {
 775         print_version(NULL);
 776         return 0;
 777     }
 778
 779     if (do_from && header_str == NULL)
 780         header_str = "From:";
 781     else if (header_str != NULL)
 782         do_from = 1;
 783
 784     if (do_from) {
 785         if (argc == 0)
 786             pobox = NULL;
 787         else if (argc == 1)
 788             pobox = argv[0];
 789         else
 790             usage (1);
 791     } else {
 792         if (argc == 1) {
 793             filename = argv[0];
 794             pobox    = NULL;
 795         } else if (argc == 2) {
 796             filename = argv[1];
 797             pobox    = argv[0];
 798         } else
 799             usage (1);
 800     }
 801
 802     if (port_str) {
 803         struct servent *s = roken_getservbyname (port_str, "tcp");
 804
 805         if (s)
 806             port = s->s_port;
 807         else {
 808             char *ptr;
 809
 810             port = strtol (port_str, &ptr, 10);
 811             if (port == 0 && ptr == port_str)
 812                 errx (1, "Bad port `%s'", port_str);
 813             port = htons(port);
 814         }
 815     }
 816     if (port == 0) {
 817 #ifdef KRB5
 818         port = krb5_getportbyname (context, "kpop", "tcp", 1109);
 819 #elif defined(KRB4)
 820         port = k_getportbyname ("kpop", "tcp", htons(1109));
 821 #else
 822 #error must define KRB4 or KRB5
 823 #endif
 824     }
 825
 826     parse_pobox (pobox, &host, &user);
 827
 828 #ifdef KRB5
 829     if (ret && use_v5) {
 830         ret = do_v5 (host, port, user, filename, header_str,
 831                      do_leave, verbose_level, do_fork);
 832     }
 833 #endif
 834
 835 #ifdef KRB4
 836     if (ret && use_v4) {
 837         ret = do_v4 (host, port, user, filename, header_str,
 838                      do_leave, verbose_level, do_fork);
 839     }
 840 #endif /* KRB4 */
 841     return ret;
 842 }