pop3.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ POP3 (RFCs 1939, 2595) client.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 - 2014 Steffen (Daode) Nurpmeso <sdaoden@users.sf.net>.
   6  */
   7 /*
   8  * Copyright (c) 2002
   9  * Gunnar Ritter.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *    This product includes software developed by Gunnar Ritter
  22  *    and his contributors.
  23  * 4. Neither the name of Gunnar Ritter nor the names of his contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY GUNNAR RITTER AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL GUNNAR RITTER OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  */
  39
  40 #ifndef HAVE_AMALGAMATION
  41 # include "nail.h"
  42 #endif
  43
  44 EMPTY_FILE(pop3)
  45 #ifdef HAVE_POP3
  46
  47 #define POP3_ANSWER(RV,ACTIONSTOP) \
  48 do if (((RV) = pop3_answer(mp)) == STOP) {\
  49    ACTIONSTOP;\
  50 } while (0)
  51
  52 #define POP3_OUT(RV,X,Y,ACTIONSTOP) \
  53 do {\
  54    if (((RV) = pop3_finish(mp)) == STOP) {\
  55       ACTIONSTOP;\
  56    }\
  57    if (options & OPT_VERBOSE)\
  58       fprintf(stderr, ">>> %s", X);\
  59    mp->mb_active |= Y;\
  60    if (((RV) = swrite(&mp->mb_sock, X)) == STOP) {\
  61       ACTIONSTOP;\
  62    }\
  63 } while (0)
  64
  65 static char             *_pop3_buf;
  66 static size_t           _pop3_bufsize;
  67 static sigjmp_buf       _pop3_jmp;
  68 static sighandler_type  _pop3_savealrm;
  69 static int              _pop3_keepalive;
  70 static int volatile     _pop3_lock;
  71
  72 /* Perform entire login handshake */
  73 static enum okay  _pop3_login(struct mailbox *mp, char *xuser, char *pass,
  74                      char const *uhp, char const *xserver);
  75
  76 /* APOP: get greeting credential or NULL */
  77 #ifdef HAVE_MD5
  78 static char *     _pop3_lookup_apop_timestamp(char const *bp);
  79 #endif
  80
  81 static bool_t     _pop3_use_starttls(char const *uhp);
  82
  83 /* APOP: shall we use it (for uhp)? */
  84 static bool_t     _pop3_no_apop(char const *uhp);
  85
  86 /* Several authentication methods */
  87 #ifdef HAVE_MD5
  88 static enum okay  _pop3_auth_apop(struct mailbox *mp, char *xuser, char *pass,
  89                      char const *ts);
  90 #endif
  91 static enum okay  _pop3_auth_plain(struct mailbox *mp, char *xuser, char *pass);
  92
  93 static void       pop3_timer_off(void);
  94 static enum okay  pop3_answer(struct mailbox *mp);
  95 static enum okay  pop3_finish(struct mailbox *mp);
  96 static void       pop3catch(int s);
  97 static void       _pop3_maincatch(int s);
  98 static enum okay  pop3_noop1(struct mailbox *mp);
  99 static void       pop3alarm(int s);
 100 static enum okay  pop3_stat(struct mailbox *mp, off_t *size, int *cnt);
 101 static enum okay  pop3_list(struct mailbox *mp, int n, size_t *size);
 102 static void       pop3_init(struct mailbox *mp, int n);
 103 static void       pop3_dates(struct mailbox *mp);
 104 static void       pop3_setptr(struct mailbox *mp);
 105 static enum okay  pop3_get(struct mailbox *mp, struct message *m,
 106                      enum needspec need);
 107 static enum okay  pop3_exit(struct mailbox *mp);
 108 static enum okay  pop3_delete(struct mailbox *mp, int n);
 109 static enum okay  pop3_update(struct mailbox *mp);
 110
 111 static enum okay
 112 _pop3_login(struct mailbox *mp, char *xuser, char *pass, char const *uhp,
 113    char const *xserver)
 114 {
 115 #ifdef HAVE_MD5
 116    char *ts;
 117 #endif
 118    char *cp;
 119    enum okay rv;
 120    NYD_ENTER;
 121
 122    /* Get the greeting, check wether APOP is advertised */
 123    POP3_ANSWER(rv, goto jleave);
 124 #ifdef HAVE_MD5
 125    ts = _pop3_lookup_apop_timestamp(_pop3_buf);
 126 #endif
 127
 128    if ((cp = strchr(xserver, ':')) != NULL) { /* TODO GENERIC URI PARSE! */
 129       size_t l = (size_t)(cp - xserver);
 130       char *x = salloc(l + 1);
 131       memcpy(x, xserver, l);
 132       x[l] = '\0';
 133       xserver = x;
 134    }
 135
 136    /* If not yet secured, can we upgrade to TLS? */
 137 #ifdef HAVE_SSL
 138    if (mp->mb_sock.s_use_ssl == 0 && _pop3_use_starttls(uhp)) {
 139       POP3_OUT(rv, "STLS\r\n", MB_COMD, goto jleave);
 140       POP3_ANSWER(rv, goto jleave);
 141       if ((rv = ssl_open(xserver, &mp->mb_sock, uhp)) != OKAY)
 142          goto jleave;
 143    }
 144 #else
 145    if (_pop3_use_starttls(uhp)) {
 146       fprintf(stderr, "No SSL support compiled in.\n");
 147       rv = STOP;
 148       goto jleave;
 149    }
 150 #endif
 151
 152    /* Use the APOP single roundtrip? */
 153    if (!_pop3_no_apop(uhp)) {
 154 #ifdef HAVE_MD5
 155       if (ts != NULL) {
 156          if ((rv = _pop3_auth_apop(mp, xuser, pass, ts)) != OKAY)
 157             fprintf(stderr, tr(276,
 158                "POP3 `APOP' authentication failed, "
 159                "maybe try setting *pop3-no-apop*\n"));
 160          goto jleave;
 161       } else
 162 #endif
 163       if (options & OPT_VERBOSE)
 164          fprintf(stderr, tr(204, "No POP3 `APOP' support "
 165             "available, sending password in clear text\n"));
 166    }
 167    rv = _pop3_auth_plain(mp, xuser, pass);
 168 jleave:
 169    NYD_LEAVE;
 170    return rv;
 171 }
 172
 173 #ifdef HAVE_MD5
 174 static char *
 175 _pop3_lookup_apop_timestamp(char const *bp)
 176 {
 177    /* RFC 1939:
 178     * A POP3 server which implements the APOP command will include
 179     * a timestamp in its banner greeting.  The syntax of the timestamp
 180     * corresponds to the `msg-id' in [RFC822]
 181     * RFC 822:
 182     * msg-id   = "<" addr-spec ">"
 183     * addr-spec   = local-part "@" domain */
 184    char const *cp, *ep;
 185    size_t tl;
 186    char *rp = NULL;
 187    bool_t hadat = FAL0;
 188    NYD_ENTER;
 189
 190    if ((cp = strchr(bp, '<')) == NULL)
 191       goto jleave;
 192
 193    /* xxx What about malformed APOP timestamp (<@>) here? */
 194    for (ep = cp; *ep; ep++) {
 195       if (spacechar(*ep))
 196          goto jleave;
 197       else if (*ep == '@')
 198          hadat = TRU1;
 199       else if (*ep == '>') {
 200          if (!hadat)
 201             goto jleave;
 202          break;
 203       }
 204    }
 205    if (*ep != '>')
 206       goto jleave;
 207
 208    tl = PTR2SIZE(++ep - cp);
 209    rp = salloc(tl +1);
 210    memcpy(rp, cp, tl);
 211    rp[tl] = '\0';
 212 jleave:
 213    NYD_LEAVE;
 214    return rp;
 215 }
 216 #endif
 217
 218 static bool_t
 219 _pop3_use_starttls(char const *uhp)
 220 {
 221    bool_t rv;
 222    NYD_ENTER;
 223
 224    if (!(rv = ok_blook(pop3_use_starttls)))
 225       rv = vok_blook(savecat("pop3-use-starttls-", uhp));
 226    NYD_LEAVE;
 227    return rv;
 228 }
 229
 230 static bool_t
 231 _pop3_no_apop(char const *uhp)
 232 {
 233    bool_t rv;
 234    NYD_ENTER;
 235
 236    if (!(rv = ok_blook(pop3_no_apop)))
 237       rv = vok_blook(savecat("pop3-no-apop-", uhp));
 238    NYD_LEAVE;
 239    return rv;
 240 }
 241
 242 #ifdef HAVE_MD5
 243 static enum okay
 244 _pop3_auth_apop(struct mailbox *mp, char *xuser, char *pass, char const *ts)
 245 {
 246    unsigned char digest[16];
 247    char hex[MD5TOHEX_SIZE];
 248    md5_ctx  ctx;
 249    size_t tl, i;
 250    char *user, *cp;
 251    enum okay rv = STOP;
 252    NYD_ENTER;
 253
 254    for (tl = strlen(ts);;) {
 255       user = xuser;
 256       if (!getcredentials(&user, &pass))
 257          break;
 258
 259       md5_init(&ctx);
 260       md5_update(&ctx, (unsigned char*)UNCONST(ts), tl);
 261       md5_update(&ctx, (unsigned char*)pass, strlen(pass));
 262       md5_final(digest, &ctx);
 263       md5tohex(hex, digest);
 264
 265       i = strlen(user);
 266       cp = ac_alloc(5 + i + 1 + MD5TOHEX_SIZE + 2 +1);
 267
 268       memcpy(cp, "APOP ", 5);
 269       memcpy(cp + 5, user, i);
 270       i += 5;
 271       cp[i++] = ' ';
 272       memcpy(cp + i, hex, MD5TOHEX_SIZE);
 273       i += MD5TOHEX_SIZE;
 274       memcpy(cp + i, "\r\n\0", 3);
 275       POP3_OUT(rv, cp, MB_COMD, goto jcont);
 276       POP3_ANSWER(rv, goto jcont);
 277       rv = OKAY;
 278 jcont:
 279       ac_free(cp);
 280       if (rv == OKAY)
 281          break;
 282       pass = NULL;
 283    }
 284    NYD_LEAVE;
 285    return rv;
 286 }
 287 #endif /* HAVE_MD5 */
 288
 289 static enum okay
 290 _pop3_auth_plain(struct mailbox *mp, char *xuser, char *pass)
 291 {
 292    char *user, *cp;
 293    size_t ul, pl;
 294    enum okay rv = STOP;
 295    NYD_ENTER;
 296
 297    /* The USER/PASS plain text version */
 298    for (;;) {
 299       user = xuser;
 300       if (!getcredentials(&user, &pass))
 301          break;
 302
 303       ul = strlen(user);
 304       pl = strlen(pass);
 305       cp = ac_alloc(MAX(ul, pl) + 5 + 2 +1);
 306
 307       memcpy(cp, "USER ", 5);
 308       memcpy(cp + 5, user, ul);
 309       memcpy(cp + 5 + ul, "\r\n\0", 3);
 310       POP3_OUT(rv, cp, MB_COMD, goto jcont);
 311       POP3_ANSWER(rv, goto jcont);
 312
 313       memcpy(cp, "PASS ", 5);
 314       memcpy(cp + 5, pass, pl);
 315       memcpy(cp + 5 + pl, "\r\n\0", 3);
 316       POP3_OUT(rv, cp, MB_COMD, goto jcont);
 317       POP3_ANSWER(rv, goto jcont);
 318       rv = OKAY;
 319 jcont:
 320       ac_free(cp);
 321       if (rv == OKAY)
 322          break;
 323       pass = NULL;
 324    }
 325    NYD_LEAVE;
 326    return rv;
 327 }
 328
 329 static void
 330 pop3_timer_off(void)
 331 {
 332    NYD_ENTER;
 333    if (_pop3_keepalive > 0) {
 334       alarm(0);
 335       safe_signal(SIGALRM, _pop3_savealrm);
 336    }
 337    NYD_LEAVE;
 338 }
 339
 340 static enum okay
 341 pop3_answer(struct mailbox *mp)
 342 {
 343    int sz;
 344    enum okay rv = STOP;
 345    NYD_ENTER;
 346
 347 jretry:
 348    if ((sz = sgetline(&_pop3_buf, &_pop3_bufsize, NULL, &mp->mb_sock)) > 0) {
 349       if ((mp->mb_active & (MB_COMD | MB_MULT)) == MB_MULT)
 350          goto jmultiline;
 351       if (options & OPT_VERBOSE)
 352          fputs(_pop3_buf, stderr);
 353       switch (*_pop3_buf) {
 354       case '+':
 355          rv = OKAY;
 356          mp->mb_active &= ~MB_COMD;
 357          break;
 358       case '-':
 359          rv = STOP;
 360          mp->mb_active = MB_NONE;
 361          fprintf(stderr, tr(218, "POP3 error: %s"), _pop3_buf);
 362          break;
 363       default:
 364          /* If the answer starts neither with '+' nor with
 365           * '-', it must be part of a multiline response,
 366           * e. g. because the user interrupted a file
 367           * download. Get lines until a single dot appears */
 368 jmultiline:
 369          while (_pop3_buf[0] != '.' || _pop3_buf[1] != '\r' ||
 370                _pop3_buf[2] != '\n' || _pop3_buf[3] != '\0') {
 371             sz = sgetline(&_pop3_buf, &_pop3_bufsize, NULL, &mp->mb_sock);
 372             if (sz <= 0)
 373                goto jeof;
 374          }
 375          mp->mb_active &= ~MB_MULT;
 376          if (mp->mb_active != MB_NONE)
 377             goto jretry;
 378       }
 379    } else {
 380 jeof:
 381       rv = STOP;
 382       mp->mb_active = MB_NONE;
 383    }
 384    NYD_LEAVE;
 385    return rv;
 386 }
 387
 388 static enum okay
 389 pop3_finish(struct mailbox *mp)
 390 {
 391    NYD_ENTER;
 392    while (mp->mb_sock.s_fd > 0 && mp->mb_active != MB_NONE)
 393       pop3_answer(mp);
 394    NYD_LEAVE;
 395    return OKAY;
 396 }
 397
 398 static void
 399 pop3catch(int s)
 400 {
 401    NYD_X; /* Signal handler */
 402    termios_state_reset();
 403    switch (s) {
 404    case SIGINT:
 405       fprintf(stderr, tr(102, "Interrupt\n"));
 406       siglongjmp(_pop3_jmp, 1);
 407       break;
 408    case SIGPIPE:
 409       fprintf(stderr, "Received SIGPIPE during POP3 operation\n");
 410       break;
 411    }
 412 }
 413
 414 static void
 415 _pop3_maincatch(int s)
 416 {
 417    NYD_X; /* Signal handler */
 418    UNUSED(s);
 419
 420    if (interrupts++ == 0)
 421       fprintf(stderr, tr(102, "Interrupt\n"));
 422    else
 423       onintr(0);
 424 }
 425
 426 static enum okay
 427 pop3_noop1(struct mailbox *mp)
 428 {
 429    enum okay rv;
 430    NYD_ENTER;
 431
 432    POP3_OUT(rv, "NOOP\r\n", MB_COMD, goto jleave);
 433    POP3_ANSWER(rv, goto jleave);
 434 jleave:
 435    NYD_LEAVE;
 436    return rv;
 437 }
 438
 439 static void
 440 pop3alarm(int s)
 441 {
 442    sighandler_type   volatile saveint, savepipe;
 443    NYD_X; /* Signal handler */
 444    UNUSED(s);
 445
 446    if (_pop3_lock++ == 0) {
 447       if ((saveint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 448          safe_signal(SIGINT, &_pop3_maincatch);
 449       savepipe = safe_signal(SIGPIPE, SIG_IGN);
 450       if (sigsetjmp(_pop3_jmp, 1)) {
 451          safe_signal(SIGINT, saveint);
 452          safe_signal(SIGPIPE, savepipe);
 453          goto jbrk;
 454       }
 455       if (savepipe != SIG_IGN)
 456          safe_signal(SIGPIPE, pop3catch);
 457       if (pop3_noop1(&mb) != OKAY) {
 458          safe_signal(SIGINT, saveint);
 459          safe_signal(SIGPIPE, savepipe);
 460          goto jleave;
 461       }
 462       safe_signal(SIGINT, saveint);
 463       safe_signal(SIGPIPE, savepipe);
 464    }
 465 jbrk:
 466    alarm(_pop3_keepalive);
 467 jleave:
 468    --_pop3_lock;
 469 }
 470
 471 static enum okay
 472 pop3_stat(struct mailbox *mp, off_t *size, int *cnt)
 473 {
 474    char *cp;
 475    enum okay rv;
 476    NYD_ENTER;
 477
 478    POP3_OUT(rv, "STAT\r\n", MB_COMD, goto jleave);
 479    POP3_ANSWER(rv, goto jleave);
 480
 481    for (cp = _pop3_buf; *cp != '\0' && !spacechar(*cp); ++cp)
 482       ;
 483    while (*cp != '\0' && spacechar(*cp))
 484       ++cp;
 485
 486    if (*cp != '\0') {
 487       *cnt = (int)strtol(cp, NULL, 10);
 488       while (*cp != '\0' && !spacechar(*cp))
 489          ++cp;
 490       while (*cp != '\0' && spacechar(*cp))
 491          ++cp;
 492       if (*cp != '\0')
 493          *size = (int)strtol(cp, NULL, 10);
 494       else
 495          rv = STOP;
 496    } else
 497       rv = STOP;
 498
 499    if (rv == STOP)
 500       fprintf(stderr, tr(260, "invalid POP3 STAT response: %s\n"),
 501          _pop3_buf);
 502 jleave:
 503    NYD_LEAVE;
 504    return rv;
 505 }
 506
 507 static enum okay
 508 pop3_list(struct mailbox *mp, int n, size_t *size)
 509 {
 510    char o[LINESIZE], *cp;
 511    enum okay rv;
 512    NYD_ENTER;
 513
 514    snprintf(o, sizeof o, "LIST %u\r\n", n);
 515    POP3_OUT(rv, o, MB_COMD, goto jleave);
 516    POP3_ANSWER(rv, goto jleave);
 517
 518    for (cp = _pop3_buf; *cp != '\0' && !spacechar(*cp); ++cp)
 519       ;
 520    while (*cp != '\0' && spacechar(*cp))
 521       ++cp;
 522    while (*cp != '\0' && !spacechar(*cp))
 523       ++cp;
 524    while (*cp != '\0' && spacechar(*cp))
 525       ++cp;
 526    if (*cp != '\0')
 527       *size = (size_t)strtol(cp, NULL, 10);
 528    else
 529       *size = 0;
 530 jleave:
 531    NYD_LEAVE;
 532    return rv;
 533 }
 534
 535 static void
 536 pop3_init(struct mailbox *mp, int n)
 537 {
 538    struct message *m;
 539    char *cp;
 540    NYD_ENTER;
 541
 542    m =  message + n;
 543    m->m_flag = MUSED | MNEW | MNOFROM | MNEWEST;
 544    m->m_block = 0;
 545    m->m_offset = 0;
 546    pop3_list(mp, PTR2SIZE(m - message + 1), &m->m_xsize);
 547
 548    if ((cp = hfield1("status", m)) != NULL) {
 549       while (*cp != '\0') {
 550          if (*cp == 'R')
 551             m->m_flag |= MREAD;
 552          else if (*cp == 'O')
 553             m->m_flag &= ~MNEW;
 554          ++cp;
 555       }
 556    }
 557    NYD_LEAVE;
 558 }
 559
 560 static void
 561 pop3_dates(struct mailbox *mp)
 562 {
 563    size_t i;
 564    NYD_ENTER;
 565    UNUSED(mp);
 566
 567    for (i = 0; UICMP(z, i, <, msgCount); ++i)
 568       substdate(message + i);
 569    NYD_LEAVE;
 570 }
 571
 572 static void
 573 pop3_setptr(struct mailbox *mp)
 574 {
 575    size_t i;
 576    NYD_ENTER;
 577
 578    message = scalloc(msgCount + 1, sizeof *message);
 579    for (i = 0; UICMP(z, i, <, msgCount); ++i)
 580       pop3_init(mp, i);
 581
 582    setdot(message);
 583    message[msgCount].m_size = 0;
 584    message[msgCount].m_lines = 0;
 585    pop3_dates(mp);
 586    NYD_LEAVE;
 587 }
 588
 589 static enum okay
 590 pop3_get(struct mailbox *mp, struct message *m, enum needspec volatile need)
 591 {
 592    char o[LINESIZE], *line = NULL, *lp;
 593    sighandler_type   volatile saveint = SIG_IGN, savepipe = SIG_IGN;
 594    size_t linesize = 0, linelen, size;
 595    int number = m - message + 1, emptyline = 0, lines;
 596    off_t offset;
 597    enum okay rv = STOP;
 598    NYD_ENTER;
 599
 600    if (mp->mb_sock.s_fd < 0) {
 601       fprintf(stderr, tr(219, "POP3 connection already closed.\n"));
 602       ++_pop3_lock;
 603       goto jleave;
 604    }
 605
 606    if (_pop3_lock++ == 0) {
 607       if ((saveint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 608          safe_signal(SIGINT, &_pop3_maincatch);
 609       savepipe = safe_signal(SIGPIPE, SIG_IGN);
 610       if (sigsetjmp(_pop3_jmp, 1)) {
 611          safe_signal(SIGINT, saveint);
 612          safe_signal(SIGPIPE, savepipe);
 613          --_pop3_lock;
 614          goto jleave;
 615       }
 616       if (savepipe != SIG_IGN)
 617          safe_signal(SIGPIPE, pop3catch);
 618    }
 619
 620    fseek(mp->mb_otf, 0L, SEEK_END);
 621    offset = ftell(mp->mb_otf);
 622 jretry:
 623    switch (need) {
 624    case NEED_HEADER:
 625       snprintf(o, sizeof o, "TOP %u 0\r\n", number);
 626       break;
 627    case NEED_BODY:
 628       snprintf(o, sizeof o, "RETR %u\r\n", number);
 629       break;
 630    case NEED_UNSPEC:
 631       abort(); /* XXX */
 632    }
 633    POP3_OUT(rv, o, MB_COMD | MB_MULT, goto jleave);
 634
 635    if (pop3_answer(mp) == STOP) {
 636       if (need == NEED_HEADER) {
 637          /* The TOP POP3 command is optional, so retry with entire message */
 638          need = NEED_BODY;
 639          goto jretry;
 640       }
 641       goto jleave;
 642    }
 643
 644    size = 0;
 645    lines = 0;
 646    while (sgetline(&line, &linesize, &linelen, &mp->mb_sock) > 0) {
 647       if (line[0] == '.' && line[1] == '\r' && line[2] == '\n' &&
 648             line[3] == '\0') {
 649          mp->mb_active &= ~MB_MULT;
 650          break;
 651       }
 652       if (line[0] == '.') {
 653          lp = &line[1];
 654          linelen--;
 655       } else
 656          lp = line;
 657       /* TODO >>
 658        * Need to mask 'From ' lines. This cannot be done properly
 659        * since some servers pass them as 'From ' and others as
 660        * '>From '. Although one could identify the first kind of
 661        * server in principle, it is not possible to identify the
 662        * second as '>From ' may also come from a server of the
 663        * first type as actual data. So do what is absolutely
 664        * necessary only - mask 'From '.
 665        *
 666        * If the line is the first line of the message header, it
 667        * is likely a real 'From ' line. In this case, it is just
 668        * ignored since it violates all standards.
 669        * TODO i have *never* seen the latter?!?!?
 670        * TODO <<
 671        */
 672       /* Since we simply copy over data without doing any transfer
 673        * encoding reclassification/adjustment we *have* to perform
 674        * RFC 4155 compliant From_ quoting here */
 675       if (is_head(lp, linelen)) {
 676          if (lines == 0)
 677             continue;
 678          fputc('>', mp->mb_otf);
 679          ++size;
 680       }
 681       lines++;
 682       if (lp[linelen-1] == '\n' && (linelen == 1 ||
 683                lp[linelen-2] == '\r')) {
 684          emptyline = linelen <= 2;
 685          if (linelen > 2)
 686             fwrite(lp, 1, linelen - 2, mp->mb_otf);
 687          fputc('\n', mp->mb_otf);
 688          size += linelen - 1;
 689       } else {
 690          emptyline = 0;
 691          fwrite(lp, 1, linelen, mp->mb_otf);
 692          size += linelen;
 693       }
 694    }
 695    if (!emptyline) {
 696       /* This is very ugly; but some POP3 daemons don't end a
 697        * message with \r\n\r\n, and we need \n\n for mbox format */
 698       fputc('\n', mp->mb_otf);
 699       lines++;
 700       size++;
 701    }
 702    m->m_size = size;
 703    m->m_lines = lines;
 704    m->m_block = mailx_blockof(offset);
 705    m->m_offset = mailx_offsetof(offset);
 706    fflush(mp->mb_otf);
 707
 708    switch (need) {
 709    case NEED_HEADER:
 710       m->m_have |= HAVE_HEADER;
 711       break;
 712    case NEED_BODY:
 713       m->m_have |= HAVE_HEADER | HAVE_BODY;
 714       m->m_xlines = m->m_lines;
 715       m->m_xsize = m->m_size;
 716       break;
 717    case NEED_UNSPEC:
 718       break;
 719    }
 720
 721    rv = OKAY;
 722 jleave:
 723    if (line != NULL)
 724       free(line);
 725    if (saveint != SIG_IGN)
 726       safe_signal(SIGINT, saveint);
 727    if (savepipe != SIG_IGN)
 728       safe_signal(SIGPIPE, savepipe);
 729    --_pop3_lock;
 730    NYD_LEAVE;
 731    if (interrupts)
 732       onintr(0);
 733    return rv;
 734 }
 735
 736 static enum okay
 737 pop3_exit(struct mailbox *mp)
 738 {
 739    enum okay rv;
 740    NYD_ENTER;
 741
 742    POP3_OUT(rv, "QUIT\r\n", MB_COMD, goto jleave);
 743    POP3_ANSWER(rv, goto jleave);
 744 jleave:
 745    NYD_LEAVE;
 746    return rv;
 747 }
 748
 749 static enum okay
 750 pop3_delete(struct mailbox *mp, int n)
 751 {
 752    char o[LINESIZE];
 753    enum okay rv;
 754    NYD_ENTER;
 755
 756    snprintf(o, sizeof o, "DELE %u\r\n", n);
 757    POP3_OUT(rv, o, MB_COMD, goto jleave);
 758    POP3_ANSWER(rv, goto jleave);
 759 jleave:
 760    NYD_LEAVE;
 761    return rv;
 762 }
 763
 764 static enum okay
 765 pop3_update(struct mailbox *mp)
 766 {
 767    struct message *m;
 768    int dodel, c, gotcha, held;
 769    NYD_ENTER;
 770
 771    if (!edit) {
 772       holdbits();
 773       c = 0;
 774       for (m = message; PTRCMP(m, <, message + msgCount); ++m)
 775          if (m->m_flag & MBOX)
 776             ++c;
 777       if (c > 0)
 778          makembox();
 779    }
 780
 781    gotcha = held = 0;
 782    for (m = message; PTRCMP(m, <, message + msgCount); ++m) {
 783       if (edit)
 784          dodel = m->m_flag & MDELETED;
 785       else
 786          dodel = !((m->m_flag & MPRESERVE) || !(m->m_flag & MTOUCH));
 787       if (dodel) {
 788          pop3_delete(mp, PTR2SIZE(m - message + 1));
 789          ++gotcha;
 790       } else
 791          ++held;
 792    }
 793    if (gotcha && edit) {
 794       printf(tr(168, "\"%s\" "), displayname);
 795       printf((ok_blook(bsdcompat) || ok_blook(bsdmsgs))
 796          ? tr(170, "complete\n") : tr(212, "updated.\n"));
 797    } else if (held && !edit) {
 798       if (held == 1)
 799          printf(tr(155, "Held 1 message in %s\n"), displayname);
 800       else
 801          printf(tr(156, "Held %d messages in %s\n"), held, displayname);
 802    }
 803    fflush(stdout);
 804    NYD_LEAVE;
 805    return OKAY;
 806 }
 807
 808 FL enum okay
 809 pop3_noop(void)
 810 {
 811    sighandler_type   volatile saveint, savepipe;
 812    enum okay rv = STOP;
 813    NYD_ENTER;
 814
 815    _pop3_lock = 1;
 816    if ((saveint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 817       safe_signal(SIGINT, &_pop3_maincatch);
 818    savepipe = safe_signal(SIGPIPE, SIG_IGN);
 819    if (sigsetjmp(_pop3_jmp, 1) == 0) {
 820       if (savepipe != SIG_IGN)
 821          safe_signal(SIGPIPE, pop3catch);
 822       rv = pop3_noop1(&mb);
 823    }
 824    safe_signal(SIGINT, saveint);
 825    safe_signal(SIGPIPE, savepipe);
 826    _pop3_lock = 0;
 827    NYD_LEAVE;
 828    return rv;
 829 }
 830
 831 FL int
 832 pop3_setfile(char const *server, int nmail, int isedit)
 833 {
 834    struct sock so;
 835    sighandler_type   saveint, savepipe;
 836    char * volatile user, * volatile pass;
 837    char const *cp, *uhp, * volatile sp = server;
 838    int use_ssl = 0, rv = 1;
 839    NYD_ENTER;
 840
 841    if (nmail)
 842       goto jleave;
 843
 844    if (strncmp(sp, "pop3://", 7) == 0) {
 845       sp = &sp[7];
 846       use_ssl = 0;
 847 #ifdef HAVE_SSL
 848    } else if (strncmp(sp, "pop3s://", 8) == 0) {
 849       sp = &sp[8];
 850       use_ssl = 1;
 851 #endif
 852    }
 853    uhp = sp;
 854    pass = lookup_password_for_token(uhp);
 855
 856    if ((cp = last_at_before_slash(sp)) != NULL) {
 857       user = salloc(cp - sp +1);
 858       memcpy(user, sp, cp - sp);
 859       user[cp - sp] = '\0';
 860       sp = &cp[1];
 861       user = urlxdec(user);
 862    } else
 863       user = NULL;
 864
 865    if (sopen(sp, &so, use_ssl, uhp, (use_ssl ? "pop3s" : "pop3")) != OKAY) {
 866       rv = -1;
 867       goto jleave;
 868    }
 869    quit();
 870    edit = (isedit != 0);
 871    if (mb.mb_sock.s_fd >= 0)
 872       sclose(&mb.mb_sock);
 873    if (mb.mb_itf) {
 874       fclose(mb.mb_itf);
 875       mb.mb_itf = NULL;
 876    }
 877    if (mb.mb_otf) {
 878       fclose(mb.mb_otf);
 879       mb.mb_otf = NULL;
 880    }
 881    initbox(server);
 882    mb.mb_type = MB_VOID;
 883    _pop3_lock = 1;
 884    mb.mb_sock = so;
 885
 886    saveint = safe_signal(SIGINT, SIG_IGN);
 887    savepipe = safe_signal(SIGPIPE, SIG_IGN);
 888    if (sigsetjmp(_pop3_jmp, 1)) {
 889       sclose(&mb.mb_sock);
 890       safe_signal(SIGINT, saveint);
 891       safe_signal(SIGPIPE, savepipe);
 892       _pop3_lock = 0;
 893       goto jleave;
 894    }
 895    if (saveint != SIG_IGN)
 896       safe_signal(SIGINT, pop3catch);
 897    if (savepipe != SIG_IGN)
 898       safe_signal(SIGPIPE, pop3catch);
 899
 900    if ((cp = ok_vlook(pop3_keepalive)) != NULL) {
 901       if ((_pop3_keepalive = (int)strtol(cp, NULL, 10)) > 0) {
 902          _pop3_savealrm = safe_signal(SIGALRM, pop3alarm);
 903          alarm(_pop3_keepalive);
 904       }
 905    }
 906
 907    mb.mb_sock.s_desc = "POP3";
 908    mb.mb_sock.s_onclose = pop3_timer_off;
 909    if (_pop3_login(&mb, user, pass, uhp, sp) != OKAY ||
 910          pop3_stat(&mb, &mailsize, &msgCount) != OKAY) {
 911       sclose(&mb.mb_sock);
 912       pop3_timer_off();
 913       safe_signal(SIGINT, saveint);
 914       safe_signal(SIGPIPE, savepipe);
 915       _pop3_lock = 0;
 916       goto jleave;
 917    }
 918    mb.mb_type = MB_POP3;
 919    mb.mb_perm = (options & OPT_R_FLAG) ? 0 : MB_DELE;
 920    pop3_setptr(&mb);
 921    setmsize(msgCount);
 922    sawcom = FAL0;
 923
 924    safe_signal(SIGINT, saveint);
 925    safe_signal(SIGPIPE, savepipe);
 926    _pop3_lock = 0;
 927    if (!edit && msgCount == 0) {
 928       if (mb.mb_type == MB_POP3 && !ok_blook(emptystart))
 929          fprintf(stderr, tr(258, "No mail at %s\n"), server);
 930       goto jleave;
 931    }
 932    rv = 0;
 933 jleave:
 934    NYD_LEAVE;
 935    return rv;
 936 }
 937
 938 FL enum okay
 939 pop3_header(struct message *m)
 940 {
 941    enum okay rv;
 942    NYD_ENTER;
 943
 944    rv = pop3_get(&mb, m, (ok_blook(pop3_bulk_load) ? NEED_BODY : NEED_HEADER));
 945    NYD_LEAVE;
 946    return rv;
 947 }
 948
 949 FL enum okay
 950 pop3_body(struct message *m)
 951 {
 952    enum okay rv;
 953    NYD_ENTER;
 954
 955    rv = pop3_get(&mb, m, NEED_BODY);
 956    NYD_LEAVE;
 957    return rv;
 958 }
 959
 960 FL void
 961 pop3_quit(void)
 962 {
 963    sighandler_type   volatile saveint, savepipe;
 964    NYD_ENTER;
 965
 966    if (mb.mb_sock.s_fd < 0) {
 967       fprintf(stderr, tr(219, "POP3 connection already closed.\n"));
 968       goto jleave;
 969    }
 970
 971    _pop3_lock = 1;
 972    saveint = safe_signal(SIGINT, SIG_IGN);
 973    savepipe = safe_signal(SIGPIPE, SIG_IGN);
 974    if (sigsetjmp(_pop3_jmp, 1)) {
 975       safe_signal(SIGINT, saveint);
 976       safe_signal(SIGPIPE, saveint);
 977       _pop3_lock = 0;
 978       goto jleave;
 979    }
 980    if (saveint != SIG_IGN)
 981       safe_signal(SIGINT, pop3catch);
 982    if (savepipe != SIG_IGN)
 983       safe_signal(SIGPIPE, pop3catch);
 984    pop3_update(&mb);
 985    pop3_exit(&mb);
 986    sclose(&mb.mb_sock);
 987    safe_signal(SIGINT, saveint);
 988    safe_signal(SIGPIPE, savepipe);
 989    _pop3_lock = 0;
 990 jleave:
 991    NYD_LEAVE;
 992 }
 993 #endif /* HAVE_POP3 */
 994
 995 /* vim:set fenc=utf-8:s-it-mode */