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