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 = PTR2SIZE(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 != '\0'; ++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 '-', it must be part
 365           * of a multiline response.  Get lines until a single dot appears */
 366 jmultiline:
 367          while (_pop3_buf[0] != '.' || _pop3_buf[1] != '\r' ||
 368                _pop3_buf[2] != '\n' || _pop3_buf[3] != '\0') {
 369             sz = sgetline(&_pop3_buf, &_pop3_bufsize, NULL, &mp->mb_sock);
 370             if (sz <= 0)
 371                goto jeof;
 372          }
 373          mp->mb_active &= ~MB_MULT;
 374          if (mp->mb_active != MB_NONE)
 375             goto jretry;
 376       }
 377    } else {
 378 jeof:
 379       rv = STOP;
 380       mp->mb_active = MB_NONE;
 381    }
 382    NYD_LEAVE;
 383    return rv;
 384 }
 385
 386 static enum okay
 387 pop3_finish(struct mailbox *mp)
 388 {
 389    NYD_ENTER;
 390    while (mp->mb_sock.s_fd > 0 && mp->mb_active != MB_NONE)
 391       pop3_answer(mp);
 392    NYD_LEAVE;
 393    return OKAY;
 394 }
 395
 396 static void
 397 pop3catch(int s)
 398 {
 399    NYD_X; /* Signal handler */
 400    termios_state_reset();
 401    switch (s) {
 402    case SIGINT:
 403       fprintf(stderr, tr(102, "Interrupt\n"));
 404       siglongjmp(_pop3_jmp, 1);
 405       break;
 406    case SIGPIPE:
 407       fprintf(stderr, "Received SIGPIPE during POP3 operation\n");
 408       break;
 409    }
 410 }
 411
 412 static void
 413 _pop3_maincatch(int s)
 414 {
 415    NYD_X; /* Signal handler */
 416    UNUSED(s);
 417
 418    if (interrupts++ == 0)
 419       fprintf(stderr, tr(102, "Interrupt\n"));
 420    else
 421       onintr(0);
 422 }
 423
 424 static enum okay
 425 pop3_noop1(struct mailbox *mp)
 426 {
 427    enum okay rv;
 428    NYD_ENTER;
 429
 430    POP3_OUT(rv, "NOOP\r\n", MB_COMD, goto jleave);
 431    POP3_ANSWER(rv, goto jleave);
 432 jleave:
 433    NYD_LEAVE;
 434    return rv;
 435 }
 436
 437 static void
 438 pop3alarm(int s)
 439 {
 440    sighandler_type volatile saveint, savepipe;
 441    NYD_X; /* Signal handler */
 442    UNUSED(s);
 443
 444    if (_pop3_lock++ == 0) {
 445       if ((saveint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 446          safe_signal(SIGINT, &_pop3_maincatch);
 447       savepipe = safe_signal(SIGPIPE, SIG_IGN);
 448       if (sigsetjmp(_pop3_jmp, 1)) {
 449          safe_signal(SIGINT, saveint);
 450          safe_signal(SIGPIPE, savepipe);
 451          goto jbrk;
 452       }
 453       if (savepipe != SIG_IGN)
 454          safe_signal(SIGPIPE, pop3catch);
 455       if (pop3_noop1(&mb) != OKAY) {
 456          safe_signal(SIGINT, saveint);
 457          safe_signal(SIGPIPE, savepipe);
 458          goto jleave;
 459       }
 460       safe_signal(SIGINT, saveint);
 461       safe_signal(SIGPIPE, savepipe);
 462    }
 463 jbrk:
 464    alarm(_pop3_keepalive);
 465 jleave:
 466    --_pop3_lock;
 467 }
 468
 469 static enum okay
 470 pop3_stat(struct mailbox *mp, off_t *size, int *cnt)
 471 {
 472    char *cp;
 473    enum okay rv;
 474    NYD_ENTER;
 475
 476    POP3_OUT(rv, "STAT\r\n", MB_COMD, goto jleave);
 477    POP3_ANSWER(rv, goto jleave);
 478
 479    for (cp = _pop3_buf; *cp != '\0' && !spacechar(*cp); ++cp)
 480       ;
 481    while (*cp != '\0' && spacechar(*cp))
 482       ++cp;
 483
 484    if (*cp != '\0') {
 485       *cnt = (int)strtol(cp, NULL, 10);
 486       while (*cp != '\0' && !spacechar(*cp))
 487          ++cp;
 488       while (*cp != '\0' && spacechar(*cp))
 489          ++cp;
 490       if (*cp != '\0')
 491          *size = (int)strtol(cp, NULL, 10);
 492       else
 493          rv = STOP;
 494    } else
 495       rv = STOP;
 496
 497    if (rv == STOP)
 498       fprintf(stderr, tr(260, "invalid POP3 STAT response: %s\n"), _pop3_buf);
 499 jleave:
 500    NYD_LEAVE;
 501    return rv;
 502 }
 503
 504 static enum okay
 505 pop3_list(struct mailbox *mp, int n, size_t *size)
 506 {
 507    char o[LINESIZE], *cp;
 508    enum okay rv;
 509    NYD_ENTER;
 510
 511    snprintf(o, sizeof o, "LIST %u\r\n", n);
 512    POP3_OUT(rv, o, MB_COMD, goto jleave);
 513    POP3_ANSWER(rv, goto jleave);
 514
 515    for (cp = _pop3_buf; *cp != '\0' && !spacechar(*cp); ++cp)
 516       ;
 517    while (*cp != '\0' && spacechar(*cp))
 518       ++cp;
 519    while (*cp != '\0' && !spacechar(*cp))
 520       ++cp;
 521    while (*cp != '\0' && spacechar(*cp))
 522       ++cp;
 523    if (*cp != '\0')
 524       *size = (size_t)strtol(cp, NULL, 10);
 525    else
 526       *size = 0;
 527 jleave:
 528    NYD_LEAVE;
 529    return rv;
 530 }
 531
 532 static void
 533 pop3_init(struct mailbox *mp, int n)
 534 {
 535    struct message *m;
 536    char *cp;
 537    NYD_ENTER;
 538
 539    m =  message + n;
 540    m->m_flag = MUSED | MNEW | MNOFROM | MNEWEST;
 541    m->m_block = 0;
 542    m->m_offset = 0;
 543    pop3_list(mp, PTR2SIZE(m - message + 1), &m->m_xsize);
 544
 545    if ((cp = hfield1("status", m)) != NULL) {
 546       while (*cp != '\0') {
 547          if (*cp == 'R')
 548             m->m_flag |= MREAD;
 549          else if (*cp == 'O')
 550             m->m_flag &= ~MNEW;
 551          ++cp;
 552       }
 553    }
 554    NYD_LEAVE;
 555 }
 556
 557 static void
 558 pop3_dates(struct mailbox *mp)
 559 {
 560    size_t i;
 561    NYD_ENTER;
 562    UNUSED(mp);
 563
 564    for (i = 0; UICMP(z, i, <, msgCount); ++i)
 565       substdate(message + i);
 566    NYD_LEAVE;
 567 }
 568
 569 static void
 570 pop3_setptr(struct mailbox *mp)
 571 {
 572    size_t i;
 573    NYD_ENTER;
 574
 575    message = scalloc(msgCount + 1, sizeof *message);
 576    for (i = 0; UICMP(z, i, <, msgCount); ++i)
 577       pop3_init(mp, i);
 578
 579    setdot(message);
 580    message[msgCount].m_size = 0;
 581    message[msgCount].m_lines = 0;
 582    pop3_dates(mp);
 583    NYD_LEAVE;
 584 }
 585
 586 static enum okay
 587 pop3_get(struct mailbox *mp, struct message *m, enum needspec volatile need)
 588 {
 589    char o[LINESIZE], *line, *lp;
 590    sighandler_type volatile saveint, savepipe;
 591    size_t linesize, linelen, size;
 592    int number, emptyline, lines;
 593    off_t offset;
 594    enum okay rv;
 595    NYD_ENTER;
 596
 597    line = NULL; /* TODO line pool */
 598    saveint = savepipe = SIG_IGN;
 599    linesize = 0;
 600    number = (int)PTR2SIZE(m - message + 1);
 601    emptyline = 0;
 602    rv = STOP;
 603
 604    if (mp->mb_sock.s_fd < 0) {
 605       fprintf(stderr, tr(219, "POP3 connection already closed.\n"));
 606       ++_pop3_lock;
 607       goto jleave;
 608    }
 609
 610    if (_pop3_lock++ == 0) {
 611       if ((saveint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 612          safe_signal(SIGINT, &_pop3_maincatch);
 613       savepipe = safe_signal(SIGPIPE, SIG_IGN);
 614       if (sigsetjmp(_pop3_jmp, 1)) {
 615          safe_signal(SIGINT, saveint);
 616          safe_signal(SIGPIPE, savepipe);
 617          --_pop3_lock;
 618          goto jleave;
 619       }
 620       if (savepipe != SIG_IGN)
 621          safe_signal(SIGPIPE, pop3catch);
 622    }
 623
 624    fseek(mp->mb_otf, 0L, SEEK_END);
 625    offset = ftell(mp->mb_otf);
 626 jretry:
 627    switch (need) {
 628    case NEED_HEADER:
 629       snprintf(o, sizeof o, "TOP %u 0\r\n", number);
 630       break;
 631    case NEED_BODY:
 632       snprintf(o, sizeof o, "RETR %u\r\n", number);
 633       break;
 634    case NEED_UNSPEC:
 635       abort(); /* XXX */
 636    }
 637    POP3_OUT(rv, o, MB_COMD | MB_MULT, goto jleave);
 638
 639    if (pop3_answer(mp) == STOP) {
 640       if (need == NEED_HEADER) {
 641          /* The TOP POP3 command is optional, so retry with entire message */
 642          need = NEED_BODY;
 643          goto jretry;
 644       }
 645       goto jleave;
 646    }
 647
 648    size = 0;
 649    lines = 0;
 650    while (sgetline(&line, &linesize, &linelen, &mp->mb_sock) > 0) {
 651       if (line[0] == '.' && line[1] == '\r' && line[2] == '\n' &&
 652             line[3] == '\0') {
 653          mp->mb_active &= ~MB_MULT;
 654          break;
 655       }
 656       if (line[0] == '.') {
 657          lp = line + 1;
 658          --linelen;
 659       } else
 660          lp = line;
 661       /* TODO >>
 662        * Need to mask 'From ' lines. This cannot be done properly
 663        * since some servers pass them as 'From ' and others as
 664        * '>From '. Although one could identify the first kind of
 665        * server in principle, it is not possible to identify the
 666        * second as '>From ' may also come from a server of the
 667        * first type as actual data. So do what is absolutely
 668        * necessary only - mask 'From '.
 669        *
 670        * If the line is the first line of the message header, it
 671        * is likely a real 'From ' line. In this case, it is just
 672        * ignored since it violates all standards.
 673        * TODO i have *never* seen the latter?!?!?
 674        * TODO <<
 675        */
 676       /* Since we simply copy over data without doing any transfer
 677        * encoding reclassification/adjustment we *have* to perform
 678        * RFC 4155 compliant From_ quoting here */
 679       if (is_head(lp, linelen)) {
 680          if (lines == 0)
 681             continue;
 682          fputc('>', mp->mb_otf);
 683          ++size;
 684       }
 685       lines++;
 686       if (lp[linelen-1] == '\n' && (linelen == 1 ||
 687                lp[linelen-2] == '\r')) {
 688          emptyline = linelen <= 2;
 689          if (linelen > 2)
 690             fwrite(lp, 1, linelen - 2, mp->mb_otf);
 691          fputc('\n', mp->mb_otf);
 692          size += linelen - 1;
 693       } else {
 694          emptyline = 0;
 695          fwrite(lp, 1, linelen, mp->mb_otf);
 696          size += linelen;
 697       }
 698    }
 699    if (!emptyline) {
 700       /* This is very ugly; but some POP3 daemons don't end a
 701        * message with \r\n\r\n, and we need \n\n for mbox format */
 702       fputc('\n', mp->mb_otf);
 703       ++lines;
 704       ++size;
 705    }
 706    m->m_size = size;
 707    m->m_lines = lines;
 708    m->m_block = mailx_blockof(offset);
 709    m->m_offset = mailx_offsetof(offset);
 710    fflush(mp->mb_otf);
 711
 712    switch (need) {
 713    case NEED_HEADER:
 714       m->m_have |= HAVE_HEADER;
 715       break;
 716    case NEED_BODY:
 717       m->m_have |= HAVE_HEADER | HAVE_BODY;
 718       m->m_xlines = m->m_lines;
 719       m->m_xsize = m->m_size;
 720       break;
 721    case NEED_UNSPEC:
 722       break;
 723    }
 724
 725    rv = OKAY;
 726 jleave:
 727    if (line != NULL)
 728       free(line);
 729    if (saveint != SIG_IGN)
 730       safe_signal(SIGINT, saveint);
 731    if (savepipe != SIG_IGN)
 732       safe_signal(SIGPIPE, savepipe);
 733    --_pop3_lock;
 734    NYD_LEAVE;
 735    if (interrupts)
 736       onintr(0);
 737    return rv;
 738 }
 739
 740 static enum okay
 741 pop3_exit(struct mailbox *mp)
 742 {
 743    enum okay rv;
 744    NYD_ENTER;
 745
 746    POP3_OUT(rv, "QUIT\r\n", MB_COMD, goto jleave);
 747    POP3_ANSWER(rv, goto jleave);
 748 jleave:
 749    NYD_LEAVE;
 750    return rv;
 751 }
 752
 753 static enum okay
 754 pop3_delete(struct mailbox *mp, int n)
 755 {
 756    char o[LINESIZE];
 757    enum okay rv;
 758    NYD_ENTER;
 759
 760    snprintf(o, sizeof o, "DELE %u\r\n", n);
 761    POP3_OUT(rv, o, MB_COMD, goto jleave);
 762    POP3_ANSWER(rv, goto jleave);
 763 jleave:
 764    NYD_LEAVE;
 765    return rv;
 766 }
 767
 768 static enum okay
 769 pop3_update(struct mailbox *mp)
 770 {
 771    struct message *m;
 772    int dodel, c, gotcha, held;
 773    NYD_ENTER;
 774
 775    if (!edit) {
 776       holdbits();
 777       c = 0;
 778       for (m = message; PTRCMP(m, <, message + msgCount); ++m)
 779          if (m->m_flag & MBOX)
 780             ++c;
 781       if (c > 0)
 782          makembox();
 783    }
 784
 785    gotcha = held = 0;
 786    for (m = message; PTRCMP(m, <, message + msgCount); ++m) {
 787       if (edit)
 788          dodel = m->m_flag & MDELETED;
 789       else
 790          dodel = !((m->m_flag & MPRESERVE) || !(m->m_flag & MTOUCH));
 791       if (dodel) {
 792          pop3_delete(mp, PTR2SIZE(m - message + 1));
 793          ++gotcha;
 794       } else
 795          ++held;
 796    }
 797    if (gotcha && edit) {
 798       printf(tr(168, "\"%s\" "), displayname);
 799       printf((ok_blook(bsdcompat) || ok_blook(bsdmsgs))
 800          ? tr(170, "complete\n") : tr(212, "updated.\n"));
 801    } else if (held && !edit) {
 802       if (held == 1)
 803          printf(tr(155, "Held 1 message in %s\n"), displayname);
 804       else
 805          printf(tr(156, "Held %d messages in %s\n"), held, displayname);
 806    }
 807    fflush(stdout);
 808    NYD_LEAVE;
 809    return OKAY;
 810 }
 811
 812 FL enum okay
 813 pop3_noop(void)
 814 {
 815    sighandler_type volatile saveint, savepipe;
 816    enum okay rv = STOP;
 817    NYD_ENTER;
 818
 819    _pop3_lock = 1;
 820    if ((saveint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 821       safe_signal(SIGINT, &_pop3_maincatch);
 822    savepipe = safe_signal(SIGPIPE, SIG_IGN);
 823    if (sigsetjmp(_pop3_jmp, 1) == 0) {
 824       if (savepipe != SIG_IGN)
 825          safe_signal(SIGPIPE, pop3catch);
 826       rv = pop3_noop1(&mb);
 827    }
 828    safe_signal(SIGINT, saveint);
 829    safe_signal(SIGPIPE, savepipe);
 830    _pop3_lock = 0;
 831    NYD_LEAVE;
 832    return rv;
 833 }
 834
 835 FL int
 836 pop3_setfile(char const *server, int nmail, int isedit)
 837 {
 838    struct sock so;
 839    sighandler_type saveint, savepipe;
 840    char * volatile user, * volatile pass;
 841    char const *cp, *uhp, * volatile sp = server;
 842    int use_ssl = 0, rv = 1;
 843    NYD_ENTER;
 844
 845    if (nmail)
 846       goto jleave;
 847
 848    if (!strncmp(sp, "pop3://", 7)) {
 849       sp = sp + 7;
 850       use_ssl = 0;
 851 #ifdef HAVE_SSL
 852    } else if (!strncmp(sp, "pop3s://", 8)) {
 853       sp = sp + 8;
 854       use_ssl = 1;
 855 #endif
 856    }
 857    uhp = sp;
 858    pass = lookup_password_for_token(uhp);
 859
 860    if ((cp = last_at_before_slash(sp)) != NULL) {
 861       user = salloc(cp - sp +1);
 862       memcpy(user, sp, cp - sp);
 863       user[cp - sp] = '\0';
 864       sp = cp + 1;
 865       user = urlxdec(user);
 866    } else
 867       user = NULL;
 868
 869    if (sopen(sp, &so, use_ssl, uhp, (use_ssl ? "pop3s" : "pop3")) != OKAY) {
 870       rv = -1;
 871       goto jleave;
 872    }
 873    quit();
 874    edit = (isedit != 0);
 875    if (mb.mb_sock.s_fd >= 0)
 876       sclose(&mb.mb_sock);
 877    if (mb.mb_itf) {
 878       fclose(mb.mb_itf);
 879       mb.mb_itf = NULL;
 880    }
 881    if (mb.mb_otf) {
 882       fclose(mb.mb_otf);
 883       mb.mb_otf = NULL;
 884    }
 885    initbox(server);
 886    mb.mb_type = MB_VOID;
 887    _pop3_lock = 1;
 888    mb.mb_sock = so;
 889
 890    saveint = safe_signal(SIGINT, SIG_IGN);
 891    savepipe = safe_signal(SIGPIPE, SIG_IGN);
 892    if (sigsetjmp(_pop3_jmp, 1)) {
 893       sclose(&mb.mb_sock);
 894       safe_signal(SIGINT, saveint);
 895       safe_signal(SIGPIPE, savepipe);
 896       _pop3_lock = 0;
 897       goto jleave;
 898    }
 899    if (saveint != SIG_IGN)
 900       safe_signal(SIGINT, pop3catch);
 901    if (savepipe != SIG_IGN)
 902       safe_signal(SIGPIPE, pop3catch);
 903
 904    if ((cp = ok_vlook(pop3_keepalive)) != NULL) {
 905       if ((_pop3_keepalive = (int)strtol(cp, NULL, 10)) > 0) {
 906          _pop3_savealrm = safe_signal(SIGALRM, pop3alarm);
 907          alarm(_pop3_keepalive);
 908       }
 909    }
 910
 911    mb.mb_sock.s_desc = "POP3";
 912    mb.mb_sock.s_onclose = pop3_timer_off;
 913    if (_pop3_login(&mb, user, pass, uhp, sp) != OKAY ||
 914          pop3_stat(&mb, &mailsize, &msgCount) != OKAY) {
 915       sclose(&mb.mb_sock);
 916       pop3_timer_off();
 917       safe_signal(SIGINT, saveint);
 918       safe_signal(SIGPIPE, savepipe);
 919       _pop3_lock = 0;
 920       goto jleave;
 921    }
 922    mb.mb_type = MB_POP3;
 923    mb.mb_perm = (options & OPT_R_FLAG) ? 0 : MB_DELE;
 924    pop3_setptr(&mb);
 925    setmsize(msgCount);
 926    sawcom = FAL0;
 927
 928    safe_signal(SIGINT, saveint);
 929    safe_signal(SIGPIPE, savepipe);
 930    _pop3_lock = 0;
 931    if (!edit && msgCount == 0) {
 932       if (mb.mb_type == MB_POP3 && !ok_blook(emptystart))
 933          fprintf(stderr, tr(258, "No mail at %s\n"), server);
 934       goto jleave;
 935    }
 936    rv = 0;
 937 jleave:
 938    NYD_LEAVE;
 939    return rv;
 940 }
 941
 942 FL enum okay
 943 pop3_header(struct message *m)
 944 {
 945    enum okay rv;
 946    NYD_ENTER;
 947
 948    rv = pop3_get(&mb, m, (ok_blook(pop3_bulk_load) ? NEED_BODY : NEED_HEADER));
 949    NYD_LEAVE;
 950    return rv;
 951 }
 952
 953 FL enum okay
 954 pop3_body(struct message *m)
 955 {
 956    enum okay rv;
 957    NYD_ENTER;
 958
 959    rv = pop3_get(&mb, m, NEED_BODY);
 960    NYD_LEAVE;
 961    return rv;
 962 }
 963
 964 FL void
 965 pop3_quit(void)
 966 {
 967    sighandler_type volatile saveint, savepipe;
 968    NYD_ENTER;
 969
 970    if (mb.mb_sock.s_fd < 0) {
 971       fprintf(stderr, tr(219, "POP3 connection already closed.\n"));
 972       goto jleave;
 973    }
 974
 975    _pop3_lock = 1;
 976    saveint = safe_signal(SIGINT, SIG_IGN);
 977    savepipe = safe_signal(SIGPIPE, SIG_IGN);
 978    if (sigsetjmp(_pop3_jmp, 1)) {
 979       safe_signal(SIGINT, saveint);
 980       safe_signal(SIGPIPE, saveint);
 981       _pop3_lock = 0;
 982       goto jleave;
 983    }
 984    if (saveint != SIG_IGN)
 985       safe_signal(SIGINT, pop3catch);
 986    if (savepipe != SIG_IGN)
 987       safe_signal(SIGPIPE, pop3catch);
 988    pop3_update(&mb);
 989    pop3_exit(&mb);
 990    sclose(&mb.mb_sock);
 991    safe_signal(SIGINT, saveint);
 992    safe_signal(SIGPIPE, savepipe);
 993    _pop3_lock = 0;
 994 jleave:
 995    NYD_LEAVE;
 996 }
 997 #endif /* HAVE_POP3 */
 998
 999 /* vim:set fenc=utf-8:s-it-mode */