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 - 2015 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 #undef n_FILE
  40 #define n_FILE pop3
  41
  42 #ifndef HAVE_AMALGAMATION
  43 # include "nail.h"
  44 #endif
  45
  46 EMPTY_FILE()
  47 #ifdef HAVE_POP3
  48
  49 #define POP3_ANSWER(RV,ACTIONSTOP) \
  50 do if (((RV) = pop3_answer(mp)) == STOP) {\
  51    ACTIONSTOP;\
  52 } while (0)
  53
  54 #define POP3_OUT(RV,X,Y,ACTIONSTOP) \
  55 do {\
  56    if (((RV) = pop3_finish(mp)) == STOP) {\
  57       ACTIONSTOP;\
  58    }\
  59    if (options & OPT_VERBVERB)\
  60       n_err(">>> %s", X);\
  61    mp->mb_active |= Y;\
  62    if (((RV) = swrite(&mp->mb_sock, X)) == STOP) {\
  63       ACTIONSTOP;\
  64    }\
  65 } while (0)
  66
  67 static char             *_pop3_buf;
  68 static size_t           _pop3_bufsize;
  69 static sigjmp_buf       _pop3_jmp;
  70 static sighandler_type  _pop3_savealrm;
  71 static int              _pop3_keepalive;
  72 static int volatile     _pop3_lock;
  73
  74 /* Perform entire login handshake */
  75 static enum okay  _pop3_login(struct mailbox *mp, struct sockconn *scp);
  76
  77 /* APOP: get greeting credential or NULL */
  78 #ifdef HAVE_MD5
  79 static char *     _pop3_lookup_apop_timestamp(char const *bp);
  80 #endif
  81
  82 /* Several authentication methods */
  83 #ifdef HAVE_MD5
  84 static enum okay  _pop3_auth_apop(struct mailbox *mp,
  85                      struct sockconn const *scp, char const *ts);
  86 #endif
  87 static enum okay  _pop3_auth_plain(struct mailbox *mp,
  88                      struct sockconn const *scp);
  89
  90 static void       pop3_timer_off(void);
  91 static enum okay  pop3_answer(struct mailbox *mp);
  92 static enum okay  pop3_finish(struct mailbox *mp);
  93 static void       pop3catch(int s);
  94 static void       _pop3_maincatch(int s);
  95 static enum okay  pop3_noop1(struct mailbox *mp);
  96 static void       pop3alarm(int s);
  97 static enum okay  pop3_stat(struct mailbox *mp, off_t *size, int *cnt);
  98 static enum okay  pop3_list(struct mailbox *mp, int n, size_t *size);
  99 static void       pop3_setptr(struct mailbox *mp,
 100                      struct sockconn const *scp);
 101 static enum okay  pop3_get(struct mailbox *mp, struct message *m,
 102                      enum needspec need);
 103 static enum okay  pop3_exit(struct mailbox *mp);
 104 static enum okay  pop3_delete(struct mailbox *mp, int n);
 105 static enum okay  pop3_update(struct mailbox *mp);
 106
 107 static enum okay
 108 _pop3_login(struct mailbox *mp, struct sockconn *scp)
 109 {
 110 #ifdef HAVE_MD5
 111    char *ts;
 112 #endif
 113    enum okey_xlook_mode oxm;
 114    enum okay rv;
 115    NYD_ENTER;
 116
 117    oxm = ok_blook(v15_compat) ? OXM_ALL : OXM_PLAIN | OXM_U_H_P;
 118
 119    /* Get the greeting, check wether APOP is advertised */
 120    POP3_ANSWER(rv, goto jleave);
 121 #ifdef HAVE_MD5
 122    ts = _pop3_lookup_apop_timestamp(_pop3_buf);
 123 #endif
 124
 125    /* If not yet secured, can we upgrade to TLS? */
 126 #ifdef HAVE_SSL
 127    if (!scp->sc_url.url_needs_tls &&
 128          xok_blook(pop3_use_starttls, &scp->sc_url, oxm)) {
 129       POP3_OUT(rv, "STLS" NETNL, MB_COMD, goto jleave);
 130       POP3_ANSWER(rv, goto jleave);
 131       if ((rv = ssl_open(&scp->sc_url, &scp->sc_sock)) != OKAY)
 132          goto jleave;
 133    }
 134 #else
 135    if (xok_blook(pop3_use_starttls, &scp->sc_url, oxm)) {
 136       n_err(_("No SSL support compiled in\n"));
 137       rv = STOP;
 138       goto jleave;
 139    }
 140 #endif
 141
 142    /* Use the APOP single roundtrip? */
 143 #ifdef HAVE_MD5
 144    if (ts != NULL && !xok_blook(pop3_no_apop, &scp->sc_url, oxm)) {
 145       if ((rv = _pop3_auth_apop(mp, scp, ts)) != OKAY) {
 146          char const *ccp = "";
 147 # ifdef HAVE_SSL
 148          if (scp->sc_sock.s_use_ssl)
 149             ccp = _(" (over an encrypted connection)");
 150 # endif
 151          n_err(_("POP3 \"APOP\" authentication failed!\n"
 152             "  The server indicated support - but disable via *pop3-no-apop*\n"
 153             "  to use plain text authentication%s\n"), ccp);
 154       }
 155       goto jleave;
 156    }
 157 #endif
 158
 159    rv = _pop3_auth_plain(mp, scp);
 160 jleave:
 161    NYD_LEAVE;
 162    return rv;
 163 }
 164
 165 #ifdef HAVE_MD5
 166 static char *
 167 _pop3_lookup_apop_timestamp(char const *bp)
 168 {
 169    /* RFC 1939:
 170     * A POP3 server which implements the APOP command will include
 171     * a timestamp in its banner greeting.  The syntax of the timestamp
 172     * corresponds to the "msg-id" in [RFC822]
 173     * RFC 822:
 174     * msg-id   = "<" addr-spec ">"
 175     * addr-spec   = local-part "@" domain */
 176    char const *cp, *ep;
 177    size_t tl;
 178    char *rp = NULL;
 179    bool_t hadat = FAL0;
 180    NYD_ENTER;
 181
 182    if ((cp = strchr(bp, '<')) == NULL)
 183       goto jleave;
 184
 185    /* xxx What about malformed APOP timestamp (<@>) here? */
 186    for (ep = cp; *ep != '\0'; ++ep) {
 187       if (spacechar(*ep))
 188          goto jleave;
 189       else if (*ep == '@')
 190          hadat = TRU1;
 191       else if (*ep == '>') {
 192          if (!hadat)
 193             goto jleave;
 194          break;
 195       }
 196    }
 197    if (*ep != '>')
 198       goto jleave;
 199
 200    tl = PTR2SIZE(++ep - cp);
 201    rp = salloc(tl +1);
 202    memcpy(rp, cp, tl);
 203    rp[tl] = '\0';
 204 jleave:
 205    NYD_LEAVE;
 206    return rp;
 207 }
 208 #endif
 209
 210 #ifdef HAVE_MD5
 211 static enum okay
 212 _pop3_auth_apop(struct mailbox *mp, struct sockconn const *scp, char const *ts)
 213 {
 214    unsigned char digest[16];
 215    char hex[MD5TOHEX_SIZE], *cp;
 216    md5_ctx ctx;
 217    size_t i;
 218    enum okay rv = STOP;
 219    NYD_ENTER;
 220
 221    md5_init(&ctx);
 222    md5_update(&ctx, (uc_i*)UNCONST(ts), strlen(ts));
 223    md5_update(&ctx, (uc_i*)scp->sc_cred.cc_pass.s, scp->sc_cred.cc_pass.l);
 224    md5_final(digest, &ctx);
 225    md5tohex(hex, digest);
 226
 227    i = scp->sc_cred.cc_user.l;
 228    cp = ac_alloc(5 + i + 1 + MD5TOHEX_SIZE + sizeof(NETNL)-1 +1);
 229
 230    memcpy(cp, "APOP ", 5);
 231    memcpy(cp + 5, scp->sc_cred.cc_user.s, i);
 232    i += 5;
 233    cp[i++] = ' ';
 234    memcpy(cp + i, hex, MD5TOHEX_SIZE);
 235    i += MD5TOHEX_SIZE;
 236    memcpy(cp + i, NETNL, sizeof(NETNL));
 237    POP3_OUT(rv, cp, MB_COMD, goto jleave);
 238    POP3_ANSWER(rv, goto jleave);
 239
 240    rv = OKAY;
 241 jleave:
 242    ac_free(cp);
 243    NYD_LEAVE;
 244    return rv;
 245 }
 246 #endif /* HAVE_MD5 */
 247
 248 static enum okay
 249 _pop3_auth_plain(struct mailbox *mp, struct sockconn const *scp)
 250 {
 251    char *cp;
 252    enum okay rv = STOP;
 253    NYD_ENTER;
 254
 255    /* The USER/PASS plain text version */
 256    cp = ac_alloc(MAX(scp->sc_cred.cc_user.l, scp->sc_cred.cc_pass.l) + 5 +
 257          sizeof(NETNL)-1 +1);
 258
 259    memcpy(cp, "USER ", 5);
 260    memcpy(cp + 5, scp->sc_cred.cc_user.s, scp->sc_cred.cc_user.l);
 261    memcpy(cp + 5 + scp->sc_cred.cc_user.l, NETNL, sizeof(NETNL));
 262    POP3_OUT(rv, cp, MB_COMD, goto jleave);
 263    POP3_ANSWER(rv, goto jleave);
 264
 265    memcpy(cp, "PASS ", 5);
 266    memcpy(cp + 5, scp->sc_cred.cc_pass.s, scp->sc_cred.cc_pass.l);
 267    memcpy(cp + 5 + scp->sc_cred.cc_pass.l, NETNL, sizeof(NETNL));
 268    POP3_OUT(rv, cp, MB_COMD, goto jleave);
 269    POP3_ANSWER(rv, goto jleave);
 270
 271    rv = OKAY;
 272 jleave:
 273    ac_free(cp);
 274    NYD_LEAVE;
 275    return rv;
 276 }
 277
 278 static void
 279 pop3_timer_off(void)
 280 {
 281    NYD_ENTER;
 282    if (_pop3_keepalive > 0) {
 283       alarm(0);
 284       safe_signal(SIGALRM, _pop3_savealrm);
 285    }
 286    NYD_LEAVE;
 287 }
 288
 289 static enum okay
 290 pop3_answer(struct mailbox *mp)
 291 {
 292    int sz;
 293    enum okay rv = STOP;
 294    NYD_ENTER;
 295
 296 jretry:
 297    if ((sz = sgetline(&_pop3_buf, &_pop3_bufsize, NULL, &mp->mb_sock)) > 0) {
 298       if ((mp->mb_active & (MB_COMD | MB_MULT)) == MB_MULT)
 299          goto jmultiline;
 300       if (options & OPT_VERBVERB)
 301          n_err(_pop3_buf);
 302       switch (*_pop3_buf) {
 303       case '+':
 304          rv = OKAY;
 305          mp->mb_active &= ~MB_COMD;
 306          break;
 307       case '-':
 308          rv = STOP;
 309          mp->mb_active = MB_NONE;
 310          n_err(_("POP3 error: %s"), _pop3_buf);
 311          break;
 312       default:
 313          /* If the answer starts neither with '+' nor with '-', it must be part
 314           * of a multiline response.  Get lines until a single dot appears */
 315 jmultiline:
 316          while (_pop3_buf[0] != '.' || _pop3_buf[1] != NETNL[0] ||
 317                _pop3_buf[2] != NETNL[1] || _pop3_buf[3] != '\0') {
 318             sz = sgetline(&_pop3_buf, &_pop3_bufsize, NULL, &mp->mb_sock);
 319             if (sz <= 0)
 320                goto jeof;
 321          }
 322          mp->mb_active &= ~MB_MULT;
 323          if (mp->mb_active != MB_NONE)
 324             goto jretry;
 325       }
 326    } else {
 327 jeof:
 328       rv = STOP;
 329       mp->mb_active = MB_NONE;
 330    }
 331    NYD_LEAVE;
 332    return rv;
 333 }
 334
 335 static enum okay
 336 pop3_finish(struct mailbox *mp)
 337 {
 338    NYD_ENTER;
 339    while (mp->mb_sock.s_fd > 0 && mp->mb_active != MB_NONE)
 340       pop3_answer(mp);
 341    NYD_LEAVE;
 342    return OKAY;
 343 }
 344
 345 static void
 346 pop3catch(int s)
 347 {
 348    NYD_X; /* Signal handler */
 349    switch (s) {
 350    case SIGINT:
 351       /*n_err_sighdl(_("Interrupt during POP3 operation\n"));*/
 352       interrupts = 2; /* Force "Interrupt" message shall we onintr(0) */
 353       siglongjmp(_pop3_jmp, 1);
 354       break;
 355    case SIGPIPE:
 356       n_err_sighdl(_("Received SIGPIPE during POP3 operation\n"));
 357       break;
 358    }
 359 }
 360
 361 static void
 362 _pop3_maincatch(int s)
 363 {
 364    NYD_X; /* Signal handler */
 365    UNUSED(s);
 366    if (interrupts++ == 0)
 367       n_err_sighdl(_("\n(Interrupt -- one more to abort operation)\n"));
 368    else
 369       onintr(0);
 370 }
 371
 372 static enum okay
 373 pop3_noop1(struct mailbox *mp)
 374 {
 375    enum okay rv;
 376    NYD_ENTER;
 377
 378    POP3_OUT(rv, "NOOP" NETNL, MB_COMD, goto jleave);
 379    POP3_ANSWER(rv, goto jleave);
 380 jleave:
 381    NYD_LEAVE;
 382    return rv;
 383 }
 384
 385 static void
 386 pop3alarm(int s)
 387 {
 388    sighandler_type volatile saveint, savepipe;
 389    NYD_X; /* Signal handler */
 390    UNUSED(s);
 391
 392    if (_pop3_lock++ == 0) {
 393       if ((saveint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 394          safe_signal(SIGINT, &_pop3_maincatch);
 395       savepipe = safe_signal(SIGPIPE, SIG_IGN);
 396       if (sigsetjmp(_pop3_jmp, 1)) {
 397          interrupts = 0;
 398          safe_signal(SIGINT, saveint);
 399          safe_signal(SIGPIPE, savepipe);
 400          goto jbrk;
 401       }
 402       if (savepipe != SIG_IGN)
 403          safe_signal(SIGPIPE, pop3catch);
 404       if (pop3_noop1(&mb) != OKAY) {
 405          safe_signal(SIGINT, saveint);
 406          safe_signal(SIGPIPE, savepipe);
 407          goto jleave;
 408       }
 409       safe_signal(SIGINT, saveint);
 410       safe_signal(SIGPIPE, savepipe);
 411    }
 412 jbrk:
 413    alarm(_pop3_keepalive);
 414 jleave:
 415    --_pop3_lock;
 416 }
 417
 418 static enum okay
 419 pop3_stat(struct mailbox *mp, off_t *size, int *cnt)
 420 {
 421    char *cp;
 422    enum okay rv;
 423    NYD_ENTER;
 424
 425    POP3_OUT(rv, "STAT" NETNL, MB_COMD, goto jleave);
 426    POP3_ANSWER(rv, goto jleave);
 427
 428    for (cp = _pop3_buf; *cp != '\0' && !spacechar(*cp); ++cp)
 429       ;
 430    while (*cp != '\0' && spacechar(*cp))
 431       ++cp;
 432
 433    if (*cp != '\0') {
 434       *cnt = (int)strtol(cp, NULL, 10);
 435       while (*cp != '\0' && !spacechar(*cp))
 436          ++cp;
 437       while (*cp != '\0' && spacechar(*cp))
 438          ++cp;
 439       if (*cp != '\0')
 440          *size = (int)strtol(cp, NULL, 10);
 441       else
 442          rv = STOP;
 443    } else
 444       rv = STOP;
 445
 446    if (rv == STOP)
 447       n_err(_("Invalid POP3 STAT response: %s\n"), _pop3_buf);
 448 jleave:
 449    NYD_LEAVE;
 450    return rv;
 451 }
 452
 453 static enum okay
 454 pop3_list(struct mailbox *mp, int n, size_t *size)
 455 {
 456    char o[LINESIZE], *cp;
 457    enum okay rv;
 458    NYD_ENTER;
 459
 460    snprintf(o, sizeof o, "LIST %u" NETNL, n);
 461    POP3_OUT(rv, o, MB_COMD, goto jleave);
 462    POP3_ANSWER(rv, goto jleave);
 463
 464    for (cp = _pop3_buf; *cp != '\0' && !spacechar(*cp); ++cp)
 465       ;
 466    while (*cp != '\0' && spacechar(*cp))
 467       ++cp;
 468    while (*cp != '\0' && !spacechar(*cp))
 469       ++cp;
 470    while (*cp != '\0' && spacechar(*cp))
 471       ++cp;
 472    if (*cp != '\0')
 473       *size = (size_t)strtol(cp, NULL, 10);
 474 jleave:
 475    NYD_LEAVE;
 476    return rv;
 477 }
 478
 479 static void
 480 pop3_setptr(struct mailbox *mp, struct sockconn const *scp)
 481 {
 482    size_t i;
 483    enum needspec ns;
 484    NYD_ENTER;
 485
 486    message = scalloc(msgCount + 1, sizeof *message);
 487    message[msgCount].m_size = 0;
 488    message[msgCount].m_lines = 0;
 489    dot = message; /* (Just do it: avoid crash -- shall i now do ointr(0).. */
 490
 491    for (i = 0; UICMP(z, i, <, msgCount); ++i) {
 492       struct message *m = message + i;
 493       m->m_flag = MUSED | MNEW | MNOFROM | MNEWEST;
 494       m->m_block = 0;
 495       m->m_offset = 0;
 496       m->m_size = m->m_xsize = 0;
 497    }
 498
 499    for (i = 0; UICMP(z, i, <, msgCount); ++i)
 500       if (!pop3_list(mp, i + 1, &message[i].m_xsize))
 501          goto jleave;
 502
 503    /* Force the load of all messages right now */
 504    ns = xok_blook(pop3_bulk_load, &scp->sc_url, OXM_ALL)
 505          ? NEED_BODY : NEED_HEADER;
 506    for (i = 0; UICMP(z, i, <, msgCount); ++i)
 507       if (!pop3_get(mp, message + i, ns))
 508          goto jleave;
 509
 510    srelax_hold();
 511    for (i = 0; UICMP(z, i, <, msgCount); ++i) {
 512       struct message *m = message + i;
 513       char const *cp;
 514
 515       if ((cp = hfield1("status", m)) != NULL)
 516          while (*cp != '\0') {
 517             if (*cp == 'R')
 518                m->m_flag |= MREAD;
 519             else if (*cp == 'O')
 520                m->m_flag &= ~MNEW;
 521             ++cp;
 522          }
 523
 524       substdate(m);
 525       srelax();
 526    }
 527    srelax_rele();
 528
 529    setdot(message);
 530 jleave:
 531    NYD_LEAVE;
 532 }
 533
 534 static enum okay
 535 pop3_get(struct mailbox *mp, struct message *m, enum needspec volatile need)
 536 {
 537    char o[LINESIZE], *line, *lp;
 538    sighandler_type volatile saveint, savepipe;
 539    size_t linesize, linelen, size;
 540    int number, lines;
 541    int volatile emptyline;
 542    off_t offset;
 543    enum okay volatile rv;
 544    NYD_ENTER;
 545
 546    line = NULL; /* TODO line pool */
 547    saveint = savepipe = SIG_IGN;
 548    linesize = 0;
 549    number = (int)PTR2SIZE(m - message + 1);
 550    emptyline = 0;
 551    rv = STOP;
 552
 553    if (mp->mb_sock.s_fd < 0) {
 554       n_err(_("POP3 connection already closed\n"));
 555       ++_pop3_lock;
 556       goto jleave;
 557    }
 558
 559    if (_pop3_lock++ == 0) {
 560       if ((saveint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 561          safe_signal(SIGINT, &_pop3_maincatch);
 562       savepipe = safe_signal(SIGPIPE, SIG_IGN);
 563       if (sigsetjmp(_pop3_jmp, 1))
 564          goto jleave;
 565       if (savepipe != SIG_IGN)
 566          safe_signal(SIGPIPE, pop3catch);
 567    }
 568
 569    fseek(mp->mb_otf, 0L, SEEK_END);
 570    offset = ftell(mp->mb_otf);
 571 jretry:
 572    switch (need) {
 573    case NEED_HEADER:
 574       snprintf(o, sizeof o, "TOP %u 0" NETNL, number);
 575       break;
 576    case NEED_BODY:
 577       snprintf(o, sizeof o, "RETR %u" NETNL, number);
 578       break;
 579    case NEED_UNSPEC:
 580       abort(); /* XXX */
 581    }
 582    POP3_OUT(rv, o, MB_COMD | MB_MULT, goto jleave);
 583
 584    if (pop3_answer(mp) == STOP) {
 585       if (need == NEED_HEADER) {
 586          /* The TOP POP3 command is optional, so retry with entire message */
 587          need = NEED_BODY;
 588          goto jretry;
 589       }
 590       goto jleave;
 591    }
 592
 593    size = 0;
 594    lines = 0;
 595    while (sgetline(&line, &linesize, &linelen, &mp->mb_sock) > 0) {
 596       if (line[0] == '.' && line[1] == NETNL[0] && line[2] == NETNL[1] &&
 597             line[3] == '\0') {
 598          mp->mb_active &= ~MB_MULT;
 599          break;
 600       }
 601       if (line[0] == '.') {
 602          lp = line + 1;
 603          --linelen;
 604       } else
 605          lp = line;
 606       /* TODO >>
 607        * Need to mask 'From ' lines. This cannot be done properly
 608        * since some servers pass them as 'From ' and others as
 609        * '>From '. Although one could identify the first kind of
 610        * server in principle, it is not possible to identify the
 611        * second as '>From ' may also come from a server of the
 612        * first type as actual data. So do what is absolutely
 613        * necessary only - mask 'From '.
 614        *
 615        * If the line is the first line of the message header, it
 616        * is likely a real 'From ' line. In this case, it is just
 617        * ignored since it violates all standards.
 618        * TODO i have *never* seen the latter?!?!?
 619        * TODO <<
 620        */
 621       /* Since we simply copy over data without doing any transfer
 622        * encoding reclassification/adjustment we *have* to perform
 623        * RFC 4155 compliant From_ quoting here */
 624       if (emptyline && is_head(lp, linelen, FAL0)) {
 625          putc('>', mp->mb_otf);
 626          ++size;
 627       }
 628       lines++;
 629       if (lp[linelen-1] == NETNL[1] &&
 630             (linelen == 1 || lp[linelen-2] == NETNL[0])) {
 631          emptyline = linelen <= 2;
 632          if (linelen > 2)
 633             fwrite(lp, 1, linelen - 2, mp->mb_otf);
 634          putc('\n', mp->mb_otf);
 635          size += linelen - 1;
 636       } else {
 637          emptyline = 0;
 638          fwrite(lp, 1, linelen, mp->mb_otf);
 639          size += linelen;
 640       }
 641    }
 642    if (!emptyline) {
 643       /* This is very ugly; but some POP3 daemons don't end a
 644        * message with NETNL NETNL, and we need \n\n for mbox format */
 645       putc('\n', mp->mb_otf);
 646       ++lines;
 647       ++size;
 648    }
 649    m->m_size = size;
 650    m->m_lines = lines;
 651    m->m_block = mailx_blockof(offset);
 652    m->m_offset = mailx_offsetof(offset);
 653    fflush(mp->mb_otf);
 654
 655    switch (need) {
 656    case NEED_HEADER:
 657       m->m_have |= HAVE_HEADER;
 658       break;
 659    case NEED_BODY:
 660       m->m_have |= HAVE_HEADER | HAVE_BODY;
 661       m->m_xlines = m->m_lines;
 662       m->m_xsize = m->m_size;
 663       break;
 664    case NEED_UNSPEC:
 665       break;
 666    }
 667
 668    rv = OKAY;
 669 jleave:
 670    if (line != NULL)
 671       free(line);
 672    if (saveint != SIG_IGN)
 673       safe_signal(SIGINT, saveint);
 674    if (savepipe != SIG_IGN)
 675       safe_signal(SIGPIPE, savepipe);
 676    --_pop3_lock;
 677    NYD_LEAVE;
 678    if (interrupts)
 679       onintr(0);
 680    return rv;
 681 }
 682
 683 static enum okay
 684 pop3_exit(struct mailbox *mp)
 685 {
 686    enum okay rv;
 687    NYD_ENTER;
 688
 689    POP3_OUT(rv, "QUIT" NETNL, MB_COMD, goto jleave);
 690    POP3_ANSWER(rv, goto jleave);
 691 jleave:
 692    NYD_LEAVE;
 693    return rv;
 694 }
 695
 696 static enum okay
 697 pop3_delete(struct mailbox *mp, int n)
 698 {
 699    char o[LINESIZE];
 700    enum okay rv;
 701    NYD_ENTER;
 702
 703    snprintf(o, sizeof o, "DELE %u" NETNL, n);
 704    POP3_OUT(rv, o, MB_COMD, goto jleave);
 705    POP3_ANSWER(rv, goto jleave);
 706 jleave:
 707    NYD_LEAVE;
 708    return rv;
 709 }
 710
 711 static enum okay
 712 pop3_update(struct mailbox *mp)
 713 {
 714    struct message *m;
 715    int dodel, c, gotcha, held;
 716    NYD_ENTER;
 717
 718    if (!(pstate & PS_EDIT)) {
 719       holdbits();
 720       c = 0;
 721       for (m = message; PTRCMP(m, <, message + msgCount); ++m)
 722          if (m->m_flag & MBOX)
 723             ++c;
 724       if (c > 0)
 725          makembox();
 726    }
 727
 728    gotcha = held = 0;
 729    for (m = message; PTRCMP(m, <, message + msgCount); ++m) {
 730       if (pstate & PS_EDIT)
 731          dodel = m->m_flag & MDELETED;
 732       else
 733          dodel = !((m->m_flag & MPRESERVE) || !(m->m_flag & MTOUCH));
 734       if (dodel) {
 735          pop3_delete(mp, PTR2SIZE(m - message + 1));
 736          ++gotcha;
 737       } else
 738          ++held;
 739    }
 740    if (gotcha && (pstate & PS_EDIT)) {
 741       printf(_("\"%s\" "), displayname);
 742       printf((ok_blook(bsdcompat) || ok_blook(bsdmsgs))
 743          ? _("complete\n") : _("updated\n"));
 744    } else if (held && !(pstate & PS_EDIT)) {
 745       if (held == 1)
 746          printf(_("Held 1 message in %s\n"), displayname);
 747       else
 748          printf(_("Held %d messages in %s\n"), held, displayname);
 749    }
 750    fflush(stdout);
 751    NYD_LEAVE;
 752    return OKAY;
 753 }
 754
 755 FL enum okay
 756 pop3_noop(void)
 757 {
 758    sighandler_type volatile saveint, savepipe;
 759    enum okay rv = STOP;
 760    NYD_ENTER;
 761
 762    _pop3_lock = 1;
 763    if ((saveint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 764       safe_signal(SIGINT, &_pop3_maincatch);
 765    savepipe = safe_signal(SIGPIPE, SIG_IGN);
 766    if (sigsetjmp(_pop3_jmp, 1) == 0) {
 767       if (savepipe != SIG_IGN)
 768          safe_signal(SIGPIPE, pop3catch);
 769       rv = pop3_noop1(&mb);
 770    }
 771    safe_signal(SIGINT, saveint);
 772    safe_signal(SIGPIPE, savepipe);
 773    _pop3_lock = 0;
 774    NYD_LEAVE;
 775    return rv;
 776 }
 777
 778 FL int
 779 pop3_setfile(char const *server, enum fedit_mode fm)
 780 {
 781    struct sockconn sc;
 782    sighandler_type saveint, savepipe;
 783    char const *cp;
 784    int volatile rv;
 785    NYD_ENTER;
 786
 787    rv = 1;
 788    if (fm & FEDIT_NEWMAIL)
 789       goto jleave;
 790    rv = -1;
 791
 792    if (!url_parse(&sc.sc_url, CPROTO_POP3, server))
 793       goto jleave;
 794    if (!ok_blook(v15_compat) &&
 795          (!sc.sc_url.url_had_user || sc.sc_url.url_pass.s != NULL)) {
 796       n_err(_("New-style URL used without *v15-compat* being set\n"));
 797       goto jleave;
 798    }
 799
 800    if (!(ok_blook(v15_compat) ? ccred_lookup(&sc.sc_cred, &sc.sc_url)
 801          : ccred_lookup_old(&sc.sc_cred, CPROTO_POP3,
 802             (sc.sc_url.url_had_user ? sc.sc_url.url_eu_h_p.s
 803              : sc.sc_url.url_u_h_p.s))))
 804       goto jleave;
 805
 806    if (!sopen(&sc.sc_sock, &sc.sc_url))
 807       goto jleave;
 808
 809    rv = 1;
 810    quit();
 811
 812    if (fm & FEDIT_SYSBOX)
 813       pstate &= ~PS_EDIT;
 814    else
 815       pstate |= PS_EDIT;
 816    if (mb.mb_sock.s_fd >= 0)
 817       sclose(&mb.mb_sock);
 818    if (mb.mb_itf) {
 819       fclose(mb.mb_itf);
 820       mb.mb_itf = NULL;
 821    }
 822    if (mb.mb_otf) {
 823       fclose(mb.mb_otf);
 824       mb.mb_otf = NULL;
 825    }
 826
 827    initbox(sc.sc_url.url_p_u_h_p);
 828    mb.mb_type = MB_VOID;
 829    _pop3_lock = 1;
 830    mb.mb_sock = sc.sc_sock;
 831
 832    saveint = safe_signal(SIGINT, SIG_IGN);
 833    savepipe = safe_signal(SIGPIPE, SIG_IGN);
 834    if (sigsetjmp(_pop3_jmp, 1)) {
 835       sclose(&mb.mb_sock);
 836       n_err(_("POP3 connection closed\n"));
 837       safe_signal(SIGINT, saveint);
 838       safe_signal(SIGPIPE, savepipe);
 839       _pop3_lock = 0;
 840       rv = -1;
 841       if (interrupts > 0)
 842          onintr(0);
 843       goto jleave;
 844    }
 845    if (saveint != SIG_IGN)
 846       safe_signal(SIGINT, pop3catch);
 847    if (savepipe != SIG_IGN)
 848       safe_signal(SIGPIPE, pop3catch);
 849
 850    if ((cp = xok_vlook(pop3_keepalive, &sc.sc_url, OXM_ALL)) != NULL) {
 851       if ((_pop3_keepalive = (int)strtol(cp, NULL, 10)) > 0) {
 852          _pop3_savealrm = safe_signal(SIGALRM, pop3alarm);
 853          alarm(_pop3_keepalive);
 854       }
 855    }
 856
 857    mb.mb_sock.s_desc = sc.sc_url.url_needs_tls ? "POP3S" : "POP3";
 858    mb.mb_sock.s_onclose = pop3_timer_off;
 859    if (_pop3_login(&mb, &sc) != OKAY ||
 860          pop3_stat(&mb, &mailsize, &msgCount) != OKAY) {
 861       sclose(&mb.mb_sock);
 862       pop3_timer_off();
 863       safe_signal(SIGINT, saveint);
 864       safe_signal(SIGPIPE, savepipe);
 865       _pop3_lock = 0;
 866       goto jleave;
 867    }
 868
 869    setmsize(msgCount);
 870    mb.mb_type = MB_POP3;
 871    mb.mb_perm = ((options & OPT_R_FLAG) || (fm & FEDIT_RDONLY)) ? 0 : MB_DELE;
 872    pop3_setptr(&mb, &sc);
 873    pstate &= ~PS_SAW_COMMAND;
 874
 875    safe_signal(SIGINT, saveint);
 876    safe_signal(SIGPIPE, savepipe);
 877    _pop3_lock = 0;
 878
 879    if (options & OPT_EXISTONLY) {
 880       rv = (msgCount == 0);
 881       goto jleave;
 882    }
 883
 884    if (!(pstate & PS_EDIT) && msgCount == 0) {
 885       if (!ok_blook(emptystart))
 886          n_err(_("No mail at %s\n"), server);
 887       goto jleave;
 888    }
 889
 890    rv = 0;
 891 jleave:
 892    NYD_LEAVE;
 893    return rv;
 894 }
 895
 896 FL enum okay
 897 pop3_header(struct message *m)
 898 {
 899    enum okay rv;
 900    NYD_ENTER;
 901
 902    /* TODO no URL here, no OXM possible; (however it is used in setfile()..) */
 903    rv = pop3_get(&mb, m, (ok_blook(pop3_bulk_load) ? NEED_BODY : NEED_HEADER));
 904    NYD_LEAVE;
 905    return rv;
 906 }
 907
 908 FL enum okay
 909 pop3_body(struct message *m)
 910 {
 911    enum okay rv;
 912    NYD_ENTER;
 913
 914    rv = pop3_get(&mb, m, NEED_BODY);
 915    NYD_LEAVE;
 916    return rv;
 917 }
 918
 919 FL void
 920 pop3_quit(void)
 921 {
 922    sighandler_type volatile saveint, savepipe;
 923    NYD_ENTER;
 924
 925    if (mb.mb_sock.s_fd < 0) {
 926       n_err(_("POP3 connection already closed\n"));
 927       goto jleave;
 928    }
 929
 930    _pop3_lock = 1;
 931    saveint = safe_signal(SIGINT, SIG_IGN);
 932    savepipe = safe_signal(SIGPIPE, SIG_IGN);
 933    if (sigsetjmp(_pop3_jmp, 1)) {
 934       safe_signal(SIGINT, saveint);
 935       safe_signal(SIGPIPE, savepipe);
 936       _pop3_lock = 0;
 937       interrupts = 0;
 938       goto jleave;
 939    }
 940    if (saveint != SIG_IGN)
 941       safe_signal(SIGINT, pop3catch);
 942    if (savepipe != SIG_IGN)
 943       safe_signal(SIGPIPE, pop3catch);
 944    pop3_update(&mb);
 945    pop3_exit(&mb);
 946    sclose(&mb.mb_sock);
 947    safe_signal(SIGINT, saveint);
 948    safe_signal(SIGPIPE, savepipe);
 949    _pop3_lock = 0;
 950 jleave:
 951    NYD_LEAVE;
 952 }
 953 #endif /* HAVE_POP3 */
 954
 955 /* s-it-mode */