head.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Routines for processing and detecting headlines.
   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) 1980, 1993
   9  * The Regents of the University of California.  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 the University of
  22  *    California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its 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 THE REGENTS 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 THE REGENTS 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 #ifdef HAVE_IDNA
  45 # include <idna.h>
  46 # include <idn-free.h>
  47 # include <stringprep.h>
  48 #endif
  49
  50 struct cmatch_data {
  51    size_t      tlen; /* Length of .tdata */
  52    char const  *tdata;  /* Template date - see _cmatch_data[] */
  53 };
  54
  55 /* Template characters for cmatch_data.tdata:
  56  * 'A'   An upper case char
  57  * 'a'   A lower case char
  58  * ' '   A space
  59  * '0'   A digit
  60  * 'O'   An optional digit or space
  61  * ':'   A colon
  62  * '+'  Either a plus or a minus sign */
  63 static struct cmatch_data const  _cmatch_data[] = {
  64    { 24, "Aaa Aaa O0 00:00:00 0000" },       /* BSD/ISO C90 ctime */
  65    { 28, "Aaa Aaa O0 00:00:00 AAA 0000" },   /* BSD tmz */
  66    { 21, "Aaa Aaa O0 00:00 0000" },          /* SysV ctime */
  67    { 25, "Aaa Aaa O0 00:00 AAA 0000" },      /* SysV tmz */
  68    /* RFC 822-alike From_ lines do not conform to RFC 4155, but seem to be used
  69     * in the wild (by UW-imap) */
  70    { 30, "Aaa Aaa O0 00:00:00 0000 +0000" },
  71    /* RFC 822 with zone spec; 1. military, 2. UT, 3. north america time
  72     * zone strings; note that 1. is strictly speaking not correct as some
  73     * letters are not used, and 2. is not because only "UT" is defined */
  74 #define __reuse      "Aaa Aaa O0 00:00:00 0000 AAA"
  75    { 28 - 2, __reuse }, { 28 - 1, __reuse }, { 28 - 0, __reuse },
  76    { 0, NULL }
  77 };
  78 #define _DATE_MINLEN 21
  79
  80 /* Skip over "word" as found in From_ line */
  81 static char const *        _from__skipword(char const *wp);
  82
  83 /* Match the date string against the date template (tp), return if match.
  84  * See _cmatch_data[] for template character description */
  85 static int                 _cmatch(size_t len, char const *date,
  86                               char const *tp);
  87
  88 /* Check wether date is a valid 'From_' date.
  89  * (Rather ctime(3) generated dates, according to RFC 4155) */
  90 static int                 _is_date(char const *date);
  91
  92 /* Convert the domain part of a skinned address to IDNA.
  93  * If an error occurs before Unicode information is available, revert the IDNA
  94  * error to a normal CHAR one so that the error message doesn't talk Unicode */
  95 #ifdef HAVE_IDNA
  96 static struct addrguts *   _idna_apply(struct addrguts *agp);
  97 #endif
  98
  99 /* Classify and check a (possibly skinned) header body according to RFC
 100  * *addr-spec* rules; if it (is assumed to has been) skinned it may however be
 101  * also a file or a pipe command, so check that first, then.
 102  * Otherwise perform content checking and isolate the domain part (for IDNA) */
 103 static int                 _addrspec_check(int doskin, struct addrguts *agp);
 104
 105 /* Return the next header field found in the given message.
 106  * Return >= 0 if something found, < 0 elsewise.
 107  * "colon" is set to point to the colon in the header.
 108  * Must deal with \ continuations & other such fraud */
 109 static int                 gethfield(FILE *f, char **linebuf, size_t *linesize,
 110                               int rem, char **colon);
 111
 112 static int                 msgidnextc(char const **cp, int *status);
 113
 114 /* Count the occurances of c in str */
 115 static int                 charcount(char *str, int c);
 116
 117 static char const *        nexttoken(char const *cp);
 118
 119 static char const *
 120 _from__skipword(char const *wp)
 121 {
 122    char c = 0;
 123    NYD_ENTER;
 124
 125    if (wp != NULL) {
 126       while ((c = *wp++) != '\0' && !blankchar(c)) {
 127          if (c == '"') {
 128             while ((c = *wp++) != '\0' && c != '"')
 129                ;
 130             if (c != '"')
 131                --wp;
 132          }
 133       }
 134       for (; blankchar(c); c = *wp++)
 135          ;
 136    }
 137    NYD_LEAVE;
 138    return (c == 0 ? NULL : wp - 1);
 139 }
 140
 141 static int
 142 _cmatch(size_t len, char const *date, char const *tp)
 143 {
 144    int ret = 0;
 145    NYD_ENTER;
 146
 147    while (len--) {
 148       char c = date[len];
 149       switch (tp[len]) {
 150       case 'a':
 151          if (!lowerchar(c))
 152             goto jleave;
 153          break;
 154       case 'A':
 155          if (!upperchar(c))
 156             goto jleave;
 157          break;
 158       case ' ':
 159          if (c != ' ')
 160             goto jleave;
 161          break;
 162       case '0':
 163          if (!digitchar(c))
 164             goto jleave;
 165          break;
 166       case 'O':
 167          if (c != ' ' && !digitchar(c))
 168             goto jleave;
 169          break;
 170       case ':':
 171          if (c != ':')
 172             goto jleave;
 173          break;
 174       case '+':
 175          if (c != '+' && c != '-')
 176             goto jleave;
 177          break;
 178       }
 179    }
 180    ret = 1;
 181 jleave:
 182    NYD_LEAVE;
 183    return ret;
 184 }
 185
 186 static int
 187 _is_date(char const *date)
 188 {
 189    struct cmatch_data const *cmdp;
 190    size_t dl;
 191    int rv = 0;
 192    NYD_ENTER;
 193
 194    if ((dl = strlen(date)) >= _DATE_MINLEN)
 195       for (cmdp = _cmatch_data; cmdp->tdata != NULL; ++cmdp)
 196          if (dl == cmdp->tlen && (rv = _cmatch(dl, date, cmdp->tdata)))
 197             break;
 198    NYD_LEAVE;
 199    return rv;
 200 }
 201
 202 #ifdef HAVE_IDNA
 203 static struct addrguts *
 204 _idna_apply(struct addrguts *agp)
 205 {
 206    char *idna_utf8, *idna_ascii, *cs;
 207    size_t sz, i;
 208    NYD_ENTER;
 209
 210    sz = agp->ag_slen - agp->ag_sdom_start;
 211    assert(sz > 0);
 212    idna_utf8 = ac_alloc(sz + 1);
 213    memcpy(idna_utf8, agp->ag_skinned + agp->ag_sdom_start, sz);
 214    idna_utf8[sz] = '\0';
 215
 216    /* GNU Libidn settles on top of iconv(3) without any fallback, so let's just
 217     * let it perform the charset conversion, if any should be necessary */
 218    if (!utf8) {
 219       char const *tcs = charset_get_lc();
 220       idna_ascii = idna_utf8;
 221       idna_utf8 = stringprep_convert(idna_ascii, "UTF-8", tcs);
 222       i = (idna_utf8 == NULL && errno == EINVAL);
 223       ac_free(idna_ascii);
 224
 225       if (idna_utf8 == NULL) {
 226          if (i)
 227             fprintf(stderr, tr(179, "Cannot convert from %s to %s\n"),
 228                tcs, "UTF-8");
 229          agp->ag_n_flags ^= NAME_ADDRSPEC_ERR_IDNA | NAME_ADDRSPEC_ERR_CHAR;
 230          goto jleave;
 231       }
 232    }
 233
 234    if (idna_to_ascii_8z(idna_utf8, &idna_ascii, 0) != IDNA_SUCCESS) {
 235       agp->ag_n_flags ^= NAME_ADDRSPEC_ERR_IDNA | NAME_ADDRSPEC_ERR_CHAR;
 236       goto jleave1;
 237    }
 238
 239    /* Replace the domain part of .ag_skinned with IDNA version */
 240    sz = strlen(idna_ascii);
 241    i = agp->ag_sdom_start;
 242    cs = salloc(agp->ag_slen - i + sz +1);
 243    memcpy(cs, agp->ag_skinned, i);
 244    memcpy(cs + i, idna_ascii, sz);
 245    i += sz;
 246    cs[i] = '\0';
 247
 248    agp->ag_skinned = cs;
 249    agp->ag_slen = i;
 250    NAME_ADDRSPEC_ERR_SET(agp->ag_n_flags,
 251       NAME_NAME_SALLOC | NAME_SKINNED | NAME_IDNA, 0);
 252
 253    idn_free(idna_ascii);
 254 jleave1:
 255    if (utf8)
 256       ac_free(idna_utf8);
 257    else
 258       idn_free(idna_utf8);
 259 jleave:
 260    NYD_LEAVE;
 261    return agp;
 262 }
 263 #endif
 264
 265 static int
 266 _addrspec_check(int skinned, struct addrguts *agp)
 267 {
 268    char *addr, *p;
 269    bool_t in_quote;
 270    ui8_t in_domain, hadat;
 271    union {char c; unsigned char u;} c;
 272 #ifdef HAVE_IDNA
 273    ui8_t use_idna;
 274 #endif
 275    NYD_ENTER;
 276
 277 #ifdef HAVE_IDNA
 278    use_idna = ok_blook(idna_disable) ? 0 : 1;
 279 #endif
 280    agp->ag_n_flags |= NAME_ADDRSPEC_CHECKED;
 281    addr = agp->ag_skinned;
 282
 283    if (agp->ag_iaddr_aend - agp->ag_iaddr_start == 0) {
 284       NAME_ADDRSPEC_ERR_SET(agp->ag_n_flags, NAME_ADDRSPEC_ERR_EMPTY, 0);
 285       goto jleave;
 286    }
 287
 288    /* If the field is not a recipient, it cannot be a file or a pipe */
 289    if (!skinned)
 290       goto jaddr_check;
 291
 292    /* Excerpt from nail.1:
 293     * Recipient address specifications
 294     * The rules are: Any name which starts with a `|' character specifies
 295     * a pipe,  the  command  string  following  the `|' is executed and
 296     * the message is sent to its standard input; any other name which
 297     * contains a  `@' character  is treated as a mail address; any other
 298     * name which starts with a `+' character specifies a folder name; any
 299     * other name  which  contains  a  `/' character  but  no `!'  or `%'
 300     * character before also specifies a folder name; what remains is
 301     * treated as a mail  address */
 302    if (*addr == '|') {
 303       agp->ag_n_flags |= NAME_ADDRSPEC_ISPIPE;
 304       goto jleave;
 305    }
 306    if (memchr(addr, '@', agp->ag_slen) == NULL) {
 307       if (*addr == '+')
 308          goto jisfile;
 309       for (p = addr; (c.c = *p); ++p) {
 310          if (c.c == '!' || c.c == '%')
 311             break;
 312          if (c.c == '/') {
 313 jisfile:
 314             agp->ag_n_flags |= NAME_ADDRSPEC_ISFILE;
 315             goto jleave;
 316          }
 317       }
 318    }
 319
 320 jaddr_check:
 321    in_quote = FAL0;
 322    in_domain = hadat = 0;
 323
 324    for (p = addr; (c.c = *p++) != '\0';) {
 325       if (c.c == '"') {
 326          in_quote = !in_quote;
 327       } else if (c.u < 040 || c.u >= 0177) {
 328 #ifdef HAVE_IDNA
 329          if (in_domain && use_idna > 0) {
 330             if (use_idna == 1)
 331                NAME_ADDRSPEC_ERR_SET(agp->ag_n_flags, NAME_ADDRSPEC_ERR_IDNA,
 332                   c.u);
 333             use_idna = 2;
 334          } else
 335 #endif
 336             break;
 337       } else if (in_domain == 2) {
 338          if ((c.c == ']' && *p != '\0') || c.c == '\\' || whitechar(c.c))
 339             break;
 340       } else if (in_quote && in_domain == 0) {
 341          /*EMPTY*/;
 342       } else if (c.c == '\\' && *p != '\0') {
 343          ++p;
 344       } else if (c.c == '@') {
 345          if (hadat++ > 0) {
 346             NAME_ADDRSPEC_ERR_SET(agp->ag_n_flags, NAME_ADDRSPEC_ERR_ATSEQ,
 347                c.u);
 348             goto jleave;
 349          }
 350          agp->ag_sdom_start = PTR2SIZE(p - addr);
 351          in_domain = (*p == '[') ? 2 : 1;
 352          continue;
 353       } else if (c.c == '(' || c.c == ')' || c.c == '<' || c.c == '>' ||
 354             c.c == ',' || c.c == ';' || c.c == ':' || c.c == '\\' ||
 355             c.c == '[' || c.c == ']')
 356          break;
 357       hadat = 0;
 358    }
 359
 360    if (c.c != '\0') {
 361       NAME_ADDRSPEC_ERR_SET(agp->ag_n_flags, NAME_ADDRSPEC_ERR_CHAR, c.u);
 362       goto jleave;
 363    }
 364 #ifdef HAVE_IDNA
 365    if (use_idna == 2)
 366       agp = _idna_apply(agp);
 367 #endif
 368 jleave:
 369    NYD_LEAVE;
 370    return ((agp->ag_n_flags & NAME_ADDRSPEC_INVALID) != 0);
 371 }
 372
 373 static int
 374 gethfield(FILE *f, char **linebuf, size_t *linesize, int rem, char **colon)
 375 {
 376    char *line2 = NULL, *cp, *cp2;
 377    size_t line2size = 0;
 378    int c, isenc;
 379    NYD_ENTER;
 380
 381    if (*linebuf == NULL)
 382       *linebuf = srealloc(*linebuf, *linesize = 1);
 383    **linebuf = '\0';
 384    for (;;) {
 385       if (--rem < 0) {
 386          rem = -1;
 387          break;
 388       }
 389       if ((c = readline_restart(f, linebuf, linesize, 0)) <= 0) {
 390          rem = -1;
 391          break;
 392       }
 393       for (cp = *linebuf; fieldnamechar(*cp & 0377); ++cp)
 394          ;
 395       if (cp > *linebuf)
 396          while (blankchar(*cp))
 397             ++cp;
 398       if (*cp != ':' || cp == *linebuf)
 399          continue;
 400
 401       /* I guess we got a headline.  Handle wraparound */
 402       *colon = cp;
 403       cp = *linebuf + c;
 404       for (;;) {
 405          isenc = 0;
 406          while (PTRCMP(--cp, >=, *linebuf) && blankchar(*cp))
 407             ;
 408          cp++;
 409          if (rem <= 0)
 410             break;
 411          if (PTRCMP(cp - 8, >=, *linebuf) && cp[-1] == '=' && cp[-2] == '?')
 412             isenc |= 1;
 413          ungetc(c = getc(f), f);
 414          if (!blankchar(c))
 415             break;
 416          c = readline_restart(f, &line2, &line2size, 0);
 417          if (c < 0)
 418             break;
 419          --rem;
 420          for (cp2 = line2; blankchar(*cp2); ++cp2)
 421             ;
 422          c -= (int)PTR2SIZE(cp2 - line2);
 423          if (cp2[0] == '=' && cp2[1] == '?' && c > 8)
 424             isenc |= 2;
 425          if (PTRCMP(cp + c, >=, *linebuf + *linesize - 2)) {
 426             size_t diff = PTR2SIZE(cp - *linebuf),
 427                colondiff = PTR2SIZE(*colon - *linebuf);
 428             *linebuf = srealloc(*linebuf, *linesize += c + 2);
 429             cp = &(*linebuf)[diff];
 430             *colon = &(*linebuf)[colondiff];
 431          }
 432          if (isenc != 3)
 433             *cp++ = ' ';
 434          memcpy(cp, cp2, c);
 435          cp += c;
 436       }
 437       *cp = '\0';
 438
 439       if (line2 != NULL)
 440          free(line2);
 441       break;
 442    }
 443    NYD_LEAVE;
 444    return rem;
 445 }
 446
 447 static int
 448 msgidnextc(char const **cp, int *status)
 449 {
 450    int c;
 451    NYD_ENTER;
 452
 453    for (;;) {
 454       if (*status & 01) {
 455          if (**cp == '"') {
 456             *status &= ~01;
 457             (*cp)++;
 458             continue;
 459          }
 460          if (**cp == '\\') {
 461             (*cp)++;
 462             if (**cp == '\0')
 463                goto jeof;
 464          }
 465          goto jdfl;
 466       }
 467       switch (**cp) {
 468       case '(':
 469          *cp = skip_comment(&(*cp)[1]);
 470          continue;
 471       case '>':
 472       case '\0':
 473 jeof:
 474          c = '\0';
 475          goto jleave;
 476       case '"':
 477          (*cp)++;
 478          *status |= 01;
 479          continue;
 480       case '@':
 481          *status |= 02;
 482          /*FALLTHRU*/
 483       default:
 484 jdfl:
 485          c = *(*cp)++ & 0377;
 486          c = (*status & 02) ? lowerconv(c) : c;
 487          goto jleave;
 488       }
 489    }
 490 jleave:
 491    NYD_LEAVE;
 492    return c;
 493 }
 494
 495 static int
 496 charcount(char *str, int c)
 497 {
 498    char *cp;
 499    int i;
 500    NYD_ENTER;
 501
 502    for (i = 0, cp = str; *cp; ++cp)
 503       if (*cp == c)
 504          ++i;
 505    NYD_LEAVE;
 506    return i;
 507 }
 508
 509 static char const *
 510 nexttoken(char const *cp)
 511 {
 512    NYD_ENTER;
 513    for (;;) {
 514       if (*cp == '\0') {
 515          cp = NULL;
 516          break;
 517       }
 518
 519       if (*cp == '(') {
 520          size_t nesting = 1;
 521
 522          do switch (*++cp) {
 523          case '(':
 524             ++nesting;
 525             break;
 526          case ')':
 527             --nesting;
 528             break;
 529          } while (nesting > 0 && *cp != '\0'); /* XXX error? */
 530       } else if (blankchar(*cp) || *cp == ',')
 531          ++cp;
 532       else
 533          break;
 534    }
 535    NYD_LEAVE;
 536    return cp;
 537 }
 538
 539 FL char const *
 540 myaddrs(struct header *hp)
 541 {
 542    struct name *np;
 543    char *rv;
 544    NYD_ENTER;
 545
 546    if (hp != NULL && (np = hp->h_from) != NULL) {
 547       if ((rv = np->n_fullname) != NULL)
 548          goto jleave;
 549       if ((rv = np->n_name) != NULL)
 550          goto jleave;
 551    }
 552
 553    if ((rv = ok_vlook(from)) != NULL)
 554       goto jleave;
 555
 556    /* When invoking *sendmail* directly, it's its task to generate an otherwise
 557     * undeterminable From: address.  However, if the user sets *hostname*,
 558     * accept his desire */
 559    if (ok_vlook(smtp) != NULL || ok_vlook(hostname) != NULL) {
 560       char *hn = nodename(1);
 561       size_t sz = strlen(myname) + strlen(hn) + 2;
 562       rv = salloc(sz);
 563       snprintf(rv, sz, "%s@%s", myname, hn);
 564    }
 565 jleave:
 566    NYD_LEAVE;
 567    return rv;
 568 }
 569
 570 FL char const *
 571 myorigin(struct header *hp)
 572 {
 573    char const *rv = NULL, *ccp;
 574    struct name *np;
 575    NYD_ENTER;
 576
 577    if ((ccp = myaddrs(hp)) != NULL &&
 578          (np = lextract(ccp, GEXTRA | GFULL)) != NULL)
 579       rv = (np->n_flink != NULL) ? ok_vlook(sender) : ccp;
 580    NYD_LEAVE;
 581    return rv;
 582 }
 583
 584 FL int
 585 is_head(char const *linebuf, size_t linelen) /* XXX verbose WARN */
 586 {
 587    char date[FROM_DATEBUF];
 588    int rv;
 589    NYD_ENTER;
 590
 591    rv = ((linelen <= 5 || strncmp(linebuf, "From ", 5) != 0 ||
 592          !extract_date_from_from_(linebuf, linelen, date) ||
 593          !_is_date(date)) ? 0 : 1);
 594    NYD_LEAVE;
 595    return rv;
 596 }
 597
 598 FL int
 599 extract_date_from_from_(char const *line, size_t linelen,
 600    char datebuf[FROM_DATEBUF])
 601 {
 602    int rv = 0;
 603    char const *cp = line;
 604    NYD_ENTER;
 605
 606    /* "From " */
 607    cp = _from__skipword(cp);
 608    if (cp == NULL)
 609       goto jerr;
 610    /* "addr-spec " */
 611    cp = _from__skipword(cp);
 612    if (cp == NULL)
 613       goto jerr;
 614    if (cp[0] == 't' && cp[1] == 't' && cp[2] == 'y') {
 615       cp = _from__skipword(cp);
 616       if (cp == NULL)
 617          goto jerr;
 618    }
 619
 620    linelen -= PTR2SIZE(cp - line);
 621    if (linelen < _DATE_MINLEN)
 622       goto jerr;
 623    if (cp[linelen - 1] == '\n') {
 624       --linelen;
 625       /* (Rather IMAP/POP3 only) */
 626       if (cp[linelen - 1] == '\r')
 627          --linelen;
 628       if (linelen < _DATE_MINLEN)
 629          goto jerr;
 630    }
 631    if (linelen >= FROM_DATEBUF)
 632       goto jerr;
 633
 634    rv = 1;
 635 jleave:
 636    memcpy(datebuf, cp, linelen);
 637    datebuf[linelen] = '\0';
 638    NYD_LEAVE;
 639    return rv;
 640 jerr:
 641    cp = tr(213, "<Unknown date>");
 642    linelen = strlen(cp);
 643    if (linelen >= FROM_DATEBUF)
 644       linelen = FROM_DATEBUF;
 645    goto jleave;
 646 }
 647
 648 FL void
 649 extract_header(FILE *fp, struct header *hp) /* XXX no header occur-cnt check */
 650 {
 651    struct header nh, *hq = &nh;
 652    char *linebuf = NULL, *colon;
 653    size_t linesize = 0, seenfields = 0;
 654    int lc, c;
 655    char const *val, *cp;
 656    NYD_ENTER;
 657
 658    memset(hq, 0, sizeof *hq);
 659    for (lc = 0; readline_restart(fp, &linebuf, &linesize, 0) > 0; ++lc)
 660       ;
 661
 662    /* TODO yippieia, cat(check(lextract)) :-) */
 663    rewind(fp);
 664    while ((lc = gethfield(fp, &linebuf, &linesize, lc, &colon)) >= 0) {
 665       if ((val = thisfield(linebuf, "to")) != NULL) {
 666          ++seenfields;
 667          hq->h_to = cat(hq->h_to, checkaddrs(lextract(val, GTO | GFULL)));
 668       } else if ((val = thisfield(linebuf, "cc")) != NULL) {
 669          ++seenfields;
 670          hq->h_cc = cat(hq->h_cc, checkaddrs(lextract(val, GCC | GFULL)));
 671       } else if ((val = thisfield(linebuf, "bcc")) != NULL) {
 672          ++seenfields;
 673          hq->h_bcc = cat(hq->h_bcc, checkaddrs(lextract(val, GBCC | GFULL)));
 674       } else if ((val = thisfield(linebuf, "from")) != NULL) {
 675          ++seenfields;
 676          hq->h_from = cat(hq->h_from,
 677                checkaddrs(lextract(val, GEXTRA | GFULL)));
 678       } else if ((val = thisfield(linebuf, "reply-to")) != NULL) {
 679          ++seenfields;
 680          hq->h_replyto = cat(hq->h_replyto,
 681                checkaddrs(lextract(val, GEXTRA | GFULL)));
 682       } else if ((val = thisfield(linebuf, "sender")) != NULL) {
 683          ++seenfields;
 684          hq->h_sender = cat(hq->h_sender,
 685                checkaddrs(lextract(val, GEXTRA | GFULL)));
 686       } else if ((val = thisfield(linebuf, "organization")) != NULL) {
 687          ++seenfields;
 688          for (cp = val; blankchar(*cp); ++cp)
 689             ;
 690          hq->h_organization = (hq->h_organization != NULL)
 691                ? save2str(hq->h_organization, cp) : savestr(cp);
 692       } else if ((val = thisfield(linebuf, "subject")) != NULL ||
 693             (val = thisfield(linebuf, "subj")) != NULL) {
 694          ++seenfields;
 695          for (cp = val; blankchar(*cp); ++cp)
 696             ;
 697          hq->h_subject = (hq->h_subject != NULL)
 698                ? save2str(hq->h_subject, cp) : savestr(cp);
 699       } else
 700          fprintf(stderr, tr(266, "Ignoring header field \"%s\"\n"), linebuf);
 701    }
 702
 703    /* In case the blank line after the header has been edited out.  Otherwise,
 704     * fetch the header separator */
 705    if (linebuf != NULL) {
 706       if (linebuf[0] != '\0') {
 707          for (cp = linebuf; *(++cp) != '\0';)
 708             ;
 709          fseek(fp, (long)-PTR2SIZE(1 + cp - linebuf), SEEK_CUR);
 710       } else {
 711          if ((c = getc(fp)) != '\n' && c != EOF)
 712             ungetc(c, fp);
 713       }
 714    }
 715
 716    if (seenfields > 0) {
 717       hp->h_to = hq->h_to;
 718       hp->h_cc = hq->h_cc;
 719       hp->h_bcc = hq->h_bcc;
 720       hp->h_from = hq->h_from;
 721       hp->h_replyto = hq->h_replyto;
 722       hp->h_sender = hq->h_sender;
 723       hp->h_organization = hq->h_organization;
 724       hp->h_subject = hq->h_subject;
 725    } else
 726       fprintf(stderr, tr(267, "Restoring deleted header lines\n"));
 727
 728    if (linebuf != NULL)
 729       free(linebuf);
 730    NYD_LEAVE;
 731 }
 732
 733 FL char *
 734 hfield_mult(char const *field, struct message *mp, int mult)
 735 {
 736    FILE *ibuf;
 737    int lc;
 738    size_t linesize = 0;
 739    char *linebuf = NULL, *colon, *oldhfield = NULL;
 740    char const *hfield;
 741    NYD_ENTER;
 742
 743    if ((ibuf = setinput(&mb, mp, NEED_HEADER)) == NULL)
 744       goto jleave;
 745    if ((lc = mp->m_lines - 1) < 0)
 746       goto jleave;
 747
 748    if ((mp->m_flag & MNOFROM) == 0 &&
 749          readline_restart(ibuf, &linebuf, &linesize, 0) < 0)
 750       goto jleave;
 751    while (lc > 0) {
 752       if ((lc = gethfield(ibuf, &linebuf, &linesize, lc, &colon)) < 0)
 753          break;
 754       if ((hfield = thisfield(linebuf, field)) != NULL) {
 755          oldhfield = save2str(hfield, oldhfield);
 756          if (mult == 0)
 757             break;
 758       }
 759    }
 760
 761 jleave:
 762    if (linebuf != NULL)
 763       free(linebuf);
 764    NYD_LEAVE;
 765    return oldhfield;
 766 }
 767
 768 FL char const *
 769 thisfield(char const *linebuf, char const *field)
 770 {
 771    char const *rv = NULL;
 772    NYD_ENTER;
 773
 774    while (lowerconv(*linebuf) == lowerconv(*field)) {
 775       ++linebuf;
 776       ++field;
 777    }
 778    if (*field != '\0')
 779       goto jleave;
 780
 781    while (blankchar(*linebuf))
 782       ++linebuf;
 783    if (*linebuf++ != ':')
 784       goto jleave;
 785
 786    while (blankchar(*linebuf))
 787       ++linebuf;
 788    rv = linebuf;
 789 jleave:
 790    NYD_LEAVE;
 791    return rv;
 792 }
 793
 794 FL char *
 795 nameof(struct message *mp, int reptype)
 796 {
 797    char *cp, *cp2;
 798    NYD_ENTER;
 799
 800    cp = skin(name1(mp, reptype));
 801    if (reptype != 0 || charcount(cp, '!') < 2)
 802       goto jleave;
 803    cp2 = strrchr(cp, '!');
 804    --cp2;
 805    while (cp2 > cp && *cp2 != '!')
 806       --cp2;
 807    if (*cp2 == '!')
 808       cp = cp2 + 1;
 809 jleave:
 810    NYD_LEAVE;
 811    return cp;
 812 }
 813
 814 FL char const *
 815 skip_comment(char const *cp)
 816 {
 817    size_t nesting;
 818    NYD_ENTER;
 819
 820    for (nesting = 1; nesting > 0 && *cp; ++cp) {
 821       switch (*cp) {
 822       case '\\':
 823          if (cp[1])
 824             ++cp;
 825          break;
 826       case '(':
 827          ++nesting;
 828          break;
 829       case ')':
 830          --nesting;
 831          break;
 832       }
 833    }
 834    NYD_LEAVE;
 835    return cp;
 836 }
 837
 838 FL char const *
 839 routeaddr(char const *name)
 840 {
 841    char const *np, *rp = NULL;
 842    NYD_ENTER;
 843
 844    for (np = name; *np; np++) {
 845       switch (*np) {
 846       case '(':
 847          np = skip_comment(np + 1) - 1;
 848          break;
 849       case '"':
 850          while (*np) {
 851             if (*++np == '"')
 852                break;
 853             if (*np == '\\' && np[1])
 854                np++;
 855          }
 856          break;
 857       case '<':
 858          rp = np;
 859          break;
 860       case '>':
 861          goto jleave;
 862       }
 863    }
 864    rp = NULL;
 865 jleave:
 866    NYD_LEAVE;
 867    return rp;
 868 }
 869
 870 FL int
 871 is_addr_invalid(struct name *np, int putmsg)
 872 {
 873    char cbuf[sizeof "'\\U12340'"], *name = np->n_name;
 874    int f = np->n_flags, ok8bit = 1;
 875    ui_it c;
 876    char const *fmt = "'\\x%02X'", *cs;
 877    NYD_ENTER;
 878
 879    if ((f & NAME_ADDRSPEC_INVALID) == 0 || !putmsg ||
 880          (f & NAME_ADDRSPEC_ERR_EMPTY) != 0)
 881       goto jleave;
 882
 883    if (f & NAME_ADDRSPEC_ERR_IDNA)
 884       cs = tr(284, "Invalid domain name: \"%s\", character %s\n"),
 885       fmt = "'\\U%04X'",
 886       ok8bit = 0;
 887    else if (f & NAME_ADDRSPEC_ERR_ATSEQ)
 888       cs = tr(142, "\"%s\" contains invalid %s sequence\n");
 889    else
 890       cs = tr(143, "\"%s\" contains invalid character %s\n");
 891
 892    c = NAME_ADDRSPEC_ERR_GETWC(f);
 893    if (ok8bit && c >= 040 && c <= 0177)
 894       snprintf(cbuf, sizeof cbuf, "'%c'", c);
 895    else
 896       snprintf(cbuf, sizeof cbuf, fmt, c);
 897
 898    fprintf(stderr, cs, name, cbuf);
 899 jleave:
 900    NYD_LEAVE;
 901    return ((f & NAME_ADDRSPEC_INVALID) != 0);
 902 }
 903
 904 FL char *
 905 skin(char const *name)
 906 {
 907    struct addrguts ag;
 908    char *ret = NULL;
 909    NYD_ENTER;
 910
 911    if (name != NULL) {
 912       addrspec_with_guts(1, name, &ag);
 913       ret = ag.ag_skinned;
 914       if ((ag.ag_n_flags & NAME_NAME_SALLOC) == 0)
 915          ret = savestrbuf(ret, ag.ag_slen);
 916    }
 917    NYD_LEAVE;
 918    return ret;
 919 }
 920
 921 /* TODO addrspec_with_guts: RFC 5322 */
 922 FL int
 923 addrspec_with_guts(int doskin, char const *name, struct addrguts *agp)
 924 {
 925    char const *cp;
 926    char *cp2, *bufend, *nbuf, c, gotlt, gotaddr, lastsp;
 927    int rv = 1;
 928    NYD_ENTER;
 929
 930    memset(agp, 0, sizeof *agp);
 931
 932    if ((agp->ag_input = name) == NULL || (agp->ag_ilen = strlen(name)) == 0) {
 933       agp->ag_skinned = UNCONST(""); /* ok: NAME_SALLOC is not set */
 934       agp->ag_slen = 0;
 935       agp->ag_n_flags |= NAME_ADDRSPEC_CHECKED;
 936       NAME_ADDRSPEC_ERR_SET(agp->ag_n_flags, NAME_ADDRSPEC_ERR_EMPTY, 0);
 937       goto jleave;
 938    }
 939
 940    if (!doskin || !anyof(name, "(< ")) {
 941       /*agp->ag_iaddr_start = 0;*/
 942       agp->ag_iaddr_aend = agp->ag_ilen;
 943       agp->ag_skinned = UNCONST(name); /* (NAME_SALLOC not set) */
 944       agp->ag_slen = agp->ag_ilen;
 945       agp->ag_n_flags = NAME_SKINNED;
 946       goto jcheck;
 947    }
 948
 949    /* Something makes us think we have to perform the skin operation */
 950    nbuf = ac_alloc(agp->ag_ilen + 1);
 951    /*agp->ag_iaddr_start = 0;*/
 952    cp2 = bufend = nbuf;
 953    gotlt = gotaddr = lastsp = 0;
 954
 955    for (cp = name++; (c = *cp++) != '\0'; ) {
 956       switch (c) {
 957       case '(':
 958          cp = skip_comment(cp);
 959          lastsp = 0;
 960          break;
 961       case '"':
 962          /* Start of a "quoted-string".
 963           * Copy it in its entirety */
 964          /* XXX RFC: quotes are "semantically invisible"
 965           * XXX But it was explicitly added (Changelog.Heirloom,
 966           * XXX [9.23] released 11/15/00, "Do not remove quotes
 967           * XXX when skinning names"?  No more info.. */
 968          *cp2++ = c;
 969          while ((c = *cp) != '\0') { /* TODO improve */
 970             cp++;
 971             if (c == '"') {
 972                *cp2++ = c;
 973                break;
 974             }
 975             if (c != '\\')
 976                *cp2++ = c;
 977             else if ((c = *cp) != '\0') {
 978                *cp2++ = c;
 979                cp++;
 980             }
 981          }
 982          lastsp = 0;
 983          break;
 984       case ' ':
 985       case '\t':
 986          if (gotaddr == 1) {
 987             gotaddr = 2;
 988             agp->ag_iaddr_aend = PTR2SIZE(cp - name);
 989          }
 990          if (cp[0] == 'a' && cp[1] == 't' && blankchar(cp[2]))
 991             cp += 3, *cp2++ = '@';
 992          else if (cp[0] == '@' && blankchar(cp[1]))
 993             cp += 2, *cp2++ = '@';
 994          else
 995             lastsp = 1;
 996          break;
 997       case '<':
 998          agp->ag_iaddr_start = PTR2SIZE(cp - (name - 1));
 999          cp2 = bufend;
1000          gotlt = gotaddr = 1;
1001          lastsp = 0;
1002          break;
1003       case '>':
1004          if (gotlt) {
1005             /* (_addrspec_check() verifies these later!) */
1006             agp->ag_iaddr_aend = PTR2SIZE(cp - name);
1007             gotlt = 0;
1008             while ((c = *cp) != '\0' && c != ',') {
1009                cp++;
1010                if (c == '(')
1011                   cp = skip_comment(cp);
1012                else if (c == '"')
1013                   while ((c = *cp) != '\0') {
1014                      cp++;
1015                      if (c == '"')
1016                         break;
1017                      if (c == '\\' && *cp != '\0')
1018                         ++cp;
1019                   }
1020             }
1021             lastsp = 0;
1022             break;
1023          }
1024          /* FALLTRHOUGH */
1025       default:
1026          if (lastsp) {
1027             lastsp = 0;
1028             if (gotaddr)
1029                *cp2++ = ' ';
1030          }
1031          *cp2++ = c;
1032          if (c == ',') {
1033             if (!gotlt) {
1034                *cp2++ = ' ';
1035                for (; blankchar(*cp); ++cp)
1036                   ;
1037                lastsp = 0;
1038                bufend = cp2;
1039             }
1040          } else if (!gotaddr) {
1041             gotaddr = 1;
1042             agp->ag_iaddr_start = PTR2SIZE(cp - name);
1043          }
1044       }
1045    }
1046    agp->ag_slen = PTR2SIZE(cp2 - nbuf);
1047    if (agp->ag_iaddr_aend == 0)
1048       agp->ag_iaddr_aend = agp->ag_ilen;
1049
1050    agp->ag_skinned = savestrbuf(nbuf, agp->ag_slen);
1051    ac_free(nbuf);
1052    agp->ag_n_flags = NAME_NAME_SALLOC | NAME_SKINNED;
1053 jcheck:
1054    rv = _addrspec_check(doskin, agp);
1055 jleave:
1056    NYD_LEAVE;
1057    return rv;
1058 }
1059
1060 FL char *
1061 realname(char const *name)
1062 {
1063    char const *cp, *cq, *cstart = NULL, *cend = NULL;
1064    char *rname, *rp;
1065    struct str in, out;
1066    int quoted, good, nogood;
1067    NYD_ENTER;
1068
1069    if ((cp = UNCONST(name)) == NULL)
1070       goto jleave;
1071    for (; *cp != '\0'; ++cp) {
1072       switch (*cp) {
1073       case '(':
1074          if (cstart != NULL) {
1075             /* More than one comment in address, doesn't make sense to display
1076              * it without context.  Return the entire field */
1077             cp = mime_fromaddr(name);
1078             goto jleave;
1079          }
1080          cstart = cp++;
1081          cp = skip_comment(cp);
1082          cend = cp--;
1083          if (cend <= cstart)
1084             cend = cstart = NULL;
1085          break;
1086       case '"':
1087          while (*cp) {
1088             if (*++cp == '"')
1089                break;
1090             if (*cp == '\\' && cp[1])
1091                ++cp;
1092          }
1093          break;
1094       case '<':
1095          if (cp > name) {
1096             cstart = name;
1097             cend = cp;
1098          }
1099          break;
1100       case ',':
1101          /* More than one address. Just use the first one */
1102          goto jbrk;
1103       }
1104    }
1105
1106 jbrk:
1107    if (cstart == NULL) {
1108       if (*name == '<') {
1109          /* If name contains only a route-addr, the surrounding angle brackets
1110           * don't serve any useful purpose when displaying, so remove */
1111          cp = prstr(skin(name));
1112       } else
1113          cp = mime_fromaddr(name);
1114       goto jleave;
1115    }
1116
1117    /* Strip quotes. Note that quotes that appear within a MIME encoded word are
1118     * not stripped. The idea is to strip only syntactical relevant things (but
1119     * this is not necessarily the most sensible way in practice) */
1120    rp = rname = ac_alloc(PTR2SIZE(cend - cstart +1));
1121    quoted = 0;
1122    for (cp = cstart; cp < cend; ++cp) {
1123       if (*cp == '(' && !quoted) {
1124          cq = skip_comment(++cp);
1125          if (PTRCMP(--cq, >, cend))
1126             cq = cend;
1127          while (cp < cq) {
1128             if (*cp == '\\' && PTRCMP(cp + 1, <, cq))
1129                ++cp;
1130             *rp++ = *cp++;
1131          }
1132       } else if (*cp == '\\' && PTRCMP(cp + 1, <, cend))
1133          *rp++ = *++cp;
1134       else if (*cp == '"') {
1135          quoted = !quoted;
1136          continue;
1137       } else
1138          *rp++ = *cp;
1139    }
1140    *rp = '\0';
1141    in.s = rname;
1142    in.l = rp - rname;
1143    mime_fromhdr(&in, &out, TD_ISPR | TD_ICONV);
1144    ac_free(rname);
1145    rname = savestr(out.s);
1146    free(out.s);
1147
1148    while (blankchar(*rname))
1149       ++rname;
1150    for (rp = rname; *rp != '\0'; ++rp)
1151       ;
1152    while (PTRCMP(--rp, >=, rname) && blankchar(*rp))
1153       *rp = '\0';
1154    if (rp == rname) {
1155       cp = mime_fromaddr(name);
1156       goto jleave;
1157    }
1158
1159    /* mime_fromhdr() has converted all nonprintable characters to question
1160     * marks now. These and blanks are considered uninteresting; if the
1161     * displayed part of the real name contains more than 25% of them, it is
1162     * probably better to display the plain email address instead */
1163    good = 0;
1164    nogood = 0;
1165    for (rp = rname; *rp != '\0' && PTRCMP(rp, <, rname + 20); ++rp)
1166       if (*rp == '?' || blankchar(*rp))
1167          ++nogood;
1168       else
1169          ++good;
1170    cp = (good * 3 < nogood) ? prstr(skin(name)) : rname;
1171 jleave:
1172    NYD_LEAVE;
1173    return UNCONST(cp);
1174 }
1175
1176 FL char *
1177 name1(struct message *mp, int reptype)
1178 {
1179    char *namebuf, *cp, *cp2, *linebuf = NULL;
1180    size_t namesize, linesize = 0;
1181    FILE *ibuf;
1182    int f1st = 1;
1183    NYD_ENTER;
1184
1185    if ((cp = hfield1("from", mp)) != NULL && *cp != '\0')
1186       goto jleave;
1187    if (reptype == 0 && (cp = hfield1("sender", mp)) != NULL && *cp != '\0')
1188       goto jleave;
1189
1190    namebuf = smalloc(namesize = 1);
1191    namebuf[0] = 0;
1192    if (mp->m_flag & MNOFROM)
1193       goto jout;
1194    if ((ibuf = setinput(&mb, mp, NEED_HEADER)) == NULL)
1195       goto jout;
1196    if (readline_restart(ibuf, &linebuf, &linesize, 0) < 0)
1197       goto jout;
1198
1199 jnewname:
1200    if (namesize <= linesize)
1201       namebuf = srealloc(namebuf, namesize = linesize + 1);
1202    for (cp = linebuf; *cp != '\0' && *cp != ' '; ++cp)
1203       ;
1204    for (; blankchar(*cp); ++cp)
1205       ;
1206    for (cp2 = namebuf + strlen(namebuf);
1207         *cp && !blankchar(*cp) && PTRCMP(cp2, <, namebuf + namesize - 1);)
1208       *cp2++ = *cp++;
1209    *cp2 = '\0';
1210
1211    if (readline_restart(ibuf, &linebuf, &linesize, 0) < 0)
1212       goto jout;
1213    if ((cp = strchr(linebuf, 'F')) == NULL)
1214       goto jout;
1215    if (strncmp(cp, "From", 4) != 0)
1216       goto jout;
1217    if (namesize <= linesize)
1218       namebuf = srealloc(namebuf, namesize = linesize + 1);
1219
1220    while ((cp = strchr(cp, 'r')) != NULL) {
1221       if (strncmp(cp, "remote", 6) == 0) {
1222          if ((cp = strchr(cp, 'f')) == NULL)
1223             break;
1224          if (strncmp(cp, "from", 4) != 0)
1225             break;
1226          if ((cp = strchr(cp, ' ')) == NULL)
1227             break;
1228          cp++;
1229          if (f1st) {
1230             strncpy(namebuf, cp, namesize);
1231             f1st = 0;
1232          } else {
1233             cp2 = strrchr(namebuf, '!') + 1;
1234             strncpy(cp2, cp, PTR2SIZE(namebuf + namesize - cp2));
1235          }
1236          namebuf[namesize - 2] = '!';
1237          namebuf[namesize - 1] = '\0';
1238          goto jnewname;
1239       }
1240       cp++;
1241    }
1242 jout:
1243    if (*namebuf != '\0' || ((cp = hfield1("return-path", mp))) == NULL ||
1244          *cp == '\0')
1245       cp = savestr(namebuf);
1246
1247    if (linebuf != NULL)
1248       free(linebuf);
1249    free(namebuf);
1250 jleave:
1251    NYD_LEAVE;
1252    return cp;
1253 }
1254
1255 FL int
1256 msgidcmp(char const *s1, char const *s2)
1257 {
1258    int q1 = 0, q2 = 0, c1, c2;
1259    NYD_ENTER;
1260
1261    do {
1262       c1 = msgidnextc(&s1, &q1);
1263       c2 = msgidnextc(&s2, &q2);
1264       if (c1 != c2)
1265          break;
1266    } while (c1 && c2);
1267    NYD_LEAVE;
1268    return c1 - c2;
1269 }
1270
1271 FL int
1272 is_ign(char const *field, size_t fieldlen, struct ignoretab ignoret[2])
1273 {
1274    char *realfld;
1275    int rv;
1276    NYD_ENTER;
1277
1278    rv = 0;
1279    if (ignoret == NULL)
1280       goto jleave;
1281    rv = 1;
1282    if (ignoret == allignore)
1283       goto jleave;
1284
1285    /* Lowercase it so that "Status" and "status" will hash to the same place */
1286    realfld = ac_alloc(fieldlen + 1);
1287    i_strcpy(realfld, field, fieldlen + 1);
1288    if (ignoret[1].i_count > 0)
1289       rv = !member(realfld, ignoret + 1);
1290    else
1291       rv = member(realfld, ignoret);
1292    ac_free(realfld);
1293 jleave:
1294    NYD_LEAVE;
1295    return rv;
1296 }
1297
1298 FL int
1299 member(char const *realfield, struct ignoretab *table)
1300 {
1301    struct ignore *igp;
1302    int rv = 0;
1303    NYD_ENTER;
1304
1305    for (igp = table->i_head[hash(realfield)]; igp != 0; igp = igp->i_link)
1306       if (*igp->i_field == *realfield && !strcmp(igp->i_field, realfield)) {
1307          rv = 1;
1308          break;
1309       }
1310    NYD_LEAVE;
1311    return rv;
1312 }
1313
1314 FL char const *
1315 fakefrom(struct message *mp)
1316 {
1317    char const *name;
1318    NYD_ENTER;
1319
1320    if (((name = skin(hfield1("return-path", mp))) == NULL || *name == '\0' ) &&
1321          ((name = skin(hfield1("from", mp))) == NULL || *name == '\0'))
1322       /* XXX MAILER-DAEMON is what an old MBOX manual page says.
1323        * RFC 4155 however requires a RFC 5322 (2822) conforming
1324        * "addr-spec", but we simply can't provide that */
1325       name = "MAILER-DAEMON";
1326    NYD_LEAVE;
1327    return name;
1328 }
1329
1330 FL char const *
1331 fakedate(time_t t)
1332 {
1333    char *cp, *cq;
1334    NYD_ENTER;
1335
1336    cp = ctime(&t);
1337    for (cq = cp; *cq != '\0' && *cq != '\n'; ++cq)
1338       ;
1339    *cq = '\0';
1340    cp = savestr(cp);
1341    NYD_LEAVE;
1342    return cp;
1343 }
1344
1345 FL time_t
1346 unixtime(char const *fromline)
1347 {
1348    char const *fp;
1349    char *xp;
1350    time_t t;
1351    int i, year, month, day, hour, minute, second, tzdiff;
1352    struct tm *tmptr;
1353    NYD_ENTER;
1354
1355    for (fp = fromline; *fp != '\0' && *fp != '\n'; ++fp)
1356       ;
1357    fp -= 24;
1358    if (PTR2SIZE(fp - fromline) < 7)
1359       goto jinvalid;
1360    if (fp[3] != ' ')
1361       goto jinvalid;
1362    for (i = 0;;) {
1363       if (strncmp(fp + 4, month_names[i], 3) == 0)
1364          break;
1365       if (month_names[++i][0] == '\0')
1366          goto jinvalid;
1367    }
1368    month = i + 1;
1369    if (fp[7] != ' ')
1370       goto jinvalid;
1371    day = strtol(fp + 8, &xp, 10);
1372    if (*xp != ' ' || xp != fp + 10)
1373       goto jinvalid;
1374    hour = strtol(fp + 11, &xp, 10);
1375    if (*xp != ':' || xp != fp + 13)
1376       goto jinvalid;
1377    minute = strtol(fp + 14, &xp, 10);
1378    if (*xp != ':' || xp != fp + 16)
1379       goto jinvalid;
1380    second = strtol(fp + 17, &xp, 10);
1381    if (*xp != ' ' || xp != fp + 19)
1382       goto jinvalid;
1383    year = strtol(fp + 20, &xp, 10);
1384    if (xp != fp + 24)
1385       goto jinvalid;
1386    if ((t = combinetime(year, month, day, hour, minute, second)) == (time_t)-1)
1387       goto jinvalid;
1388    tzdiff = t - mktime(gmtime(&t));
1389    tmptr = localtime(&t);
1390    if (tmptr->tm_isdst > 0)
1391       tzdiff += 3600;
1392    t -= tzdiff;
1393 jleave:
1394    NYD_LEAVE;
1395    return t;
1396 jinvalid:
1397    time(&t);
1398    goto jleave;
1399 }
1400
1401 FL time_t
1402 rfctime(char const *date)
1403 {
1404    char const *cp = date;
1405    char *x;
1406    time_t t;
1407    int i, year, month, day, hour, minute, second;
1408    NYD_ENTER;
1409
1410    if ((cp = nexttoken(cp)) == NULL)
1411       goto jinvalid;
1412    if (alphachar(cp[0]) && alphachar(cp[1]) && alphachar(cp[2]) &&
1413          cp[3] == ',') {
1414       if ((cp = nexttoken(&cp[4])) == NULL)
1415          goto jinvalid;
1416    }
1417    day = strtol(cp, &x, 10); /* XXX strtol */
1418    if ((cp = nexttoken(x)) == NULL)
1419       goto jinvalid;
1420    for (i = 0;;) {
1421       if (strncmp(cp, month_names[i], 3) == 0)
1422          break;
1423       if (month_names[++i][0] == '\0')
1424          goto jinvalid;
1425    }
1426    month = i + 1;
1427    if ((cp = nexttoken(&cp[3])) == NULL)
1428       goto jinvalid;
1429    /* RFC 5322, 4.3:
1430     *  Where a two or three digit year occurs in a date, the year is to be
1431     *  interpreted as follows: If a two digit year is encountered whose
1432     *  value is between 00 and 49, the year is interpreted by adding 2000,
1433     *  ending up with a value between 2000 and 2049.  If a two digit year
1434     *  is encountered with a value between 50 and 99, or any three digit
1435     *  year is encountered, the year is interpreted by adding 1900 */
1436    year = strtol(cp, &x, 10); /* XXX strtol */
1437    i = (int)PTR2SIZE(x - cp);
1438    if (i == 2 && year >= 0 && year <= 49)
1439       year += 2000;
1440    else if (i == 3 || (i == 2 && year >= 50 && year <= 99))
1441       year += 1900;
1442    if ((cp = nexttoken(x)) == NULL)
1443       goto jinvalid;
1444    hour = strtol(cp, &x, 10); /* XXX strtol */
1445    if (*x != ':')
1446       goto jinvalid;
1447    cp = &x[1];
1448    minute = strtol(cp, &x, 10);
1449    if (*x == ':') {
1450       cp = x + 1;
1451       second = strtol(cp, &x, 10);
1452    } else
1453       second = 0;
1454    if ((t = combinetime(year, month, day, hour, minute, second)) == (time_t)-1)
1455       goto jinvalid;
1456    if ((cp = nexttoken(x)) != NULL) {
1457       int sign = -1;
1458       char buf[3];
1459
1460       switch (*cp) {
1461       case '-':
1462          sign = 1;
1463          /*FALLTHRU*/
1464       case '+':
1465          ++cp;
1466          break;
1467       }
1468       if (digitchar(cp[0]) && digitchar(cp[1]) && digitchar(cp[2]) &&
1469             digitchar(cp[3])) {
1470          buf[2] = '\0';
1471          buf[0] = cp[0];
1472          buf[1] = cp[1];
1473          t += strtol(buf, NULL, 10) * sign * 3600;/*XXX strtrol*/
1474          buf[0] = cp[2];
1475          buf[1] = cp[3];
1476          t += strtol(buf, NULL, 10) * sign * 60; /* XXX strtol*/
1477       }
1478       /* TODO WE DO NOT YET PARSE (OBSOLETE) ZONE NAMES
1479        * TODO once again, Christos Zoulas and NetBSD Mail have done
1480        * TODO a really good job already, but using strptime(3), which
1481        * TODO is not portable.  Nonetheless, WE must improve, not
1482        * TODO at last because we simply ignore obsolete timezones!!
1483        * TODO See RFC 5322, 4.3! */
1484    }
1485 jleave:
1486    NYD_LEAVE;
1487    return t;
1488 jinvalid:
1489    t = 0;
1490    goto jleave;
1491 }
1492
1493 #define is_leapyear(Y)  ((((Y) % 100 ? (Y) : (Y) / 100) & 3) == 0)
1494
1495 FL time_t
1496 combinetime(int year, int month, int day, int hour, int minute, int second)
1497 {
1498    time_t t;
1499    NYD_ENTER;
1500
1501    if (second < 0 || minute < 0 || hour < 0 || day < 1) {
1502       t = (time_t)-1;
1503       goto jleave;
1504    }
1505
1506    t = second + minute * 60 + hour * 3600 + (day - 1) * 86400;
1507    if (month > 1)
1508       t += 86400 * 31;
1509    if (month > 2)
1510       t += 86400 * (is_leapyear(year) ? 29 : 28);
1511    if (month > 3)
1512       t += 86400 * 31;
1513    if (month > 4)
1514       t += 86400 * 30;
1515    if (month > 5)
1516       t += 86400 * 31;
1517    if (month > 6)
1518       t += 86400 * 30;
1519    if (month > 7)
1520       t += 86400 * 31;
1521    if (month > 8)
1522       t += 86400 * 31;
1523    if (month > 9)
1524       t += 86400 * 30;
1525    if (month > 10)
1526       t += 86400 * 31;
1527    if (month > 11)
1528       t += 86400 * 30;
1529    year -= 1900;
1530    t += (year - 70) * 31536000 + ((year - 69) / 4) * 86400 -
1531          ((year - 1) / 100) * 86400 + ((year + 299) / 400) * 86400;
1532 jleave:
1533    NYD_LEAVE;
1534    return t;
1535 }
1536
1537 FL void
1538 substdate(struct message *m)
1539 {
1540    char const *cp;
1541    NYD_ENTER;
1542
1543    /* Determine the date to print in faked 'From ' lines. This is traditionally
1544     * the date the message was written to the mail file. Try to determine this
1545     * using RFC message header fields, or fall back to current time */
1546    if ((cp = hfield1("received", m)) != NULL) {
1547       while ((cp = nexttoken(cp)) != NULL && *cp != ';') {
1548          do
1549             ++cp;
1550          while (alnumchar(*cp));
1551       }
1552       if (cp && *++cp)
1553          m->m_time = rfctime(cp);
1554    }
1555    if (m->m_time == 0 || m->m_time > time_current.tc_time) {
1556       if ((cp = hfield1("date", m)) != NULL)
1557          m->m_time = rfctime(cp);
1558    }
1559    if (m->m_time == 0 || m->m_time > time_current.tc_time)
1560       m->m_time = time_current.tc_time;
1561    NYD_LEAVE;
1562 }
1563
1564 FL int
1565 check_from_and_sender(struct name *fromfield, struct name *senderfield)
1566 {
1567    int rv;
1568    NYD_ENTER;
1569
1570    if (fromfield && fromfield->n_flink && senderfield == NULL) {
1571       fprintf(stderr, tr(529, "A Sender: field is required with multiple "
1572          "addresses in From: field.\n"));
1573       rv = 1;
1574    } else if (senderfield && senderfield->n_flink) {
1575       fprintf(stderr, tr(530,
1576          "The Sender: field may contain only one address.\n"));
1577       rv = 2;
1578    } else
1579       rv = 0;
1580    NYD_LEAVE;
1581    return rv;
1582 }
1583
1584 FL char *
1585 getsender(struct message *mp)
1586 {
1587    char *cp;
1588    struct name *np;
1589    NYD_ENTER;
1590
1591    if ((cp = hfield1("from", mp)) == NULL ||
1592          (np = lextract(cp, GEXTRA | GSKIN)) == NULL)
1593       cp = NULL;
1594    else
1595       cp = (np->n_flink != NULL) ? skin(hfield1("sender", mp)) : np->n_name;
1596    NYD_LEAVE;
1597    return cp;
1598 }
1599
1600 FL int
1601 grab_headers(struct header *hp, enum gfield gflags, int subjfirst)
1602 {
1603    /* TODO grab_headers: again, check counts etc. against RFC;
1604     * TODO (now assumes check_from_and_sender() is called afterwards ++ */
1605    int errs;
1606    int volatile comma;
1607    NYD_ENTER;
1608
1609    errs = 0;
1610    comma = (ok_blook(bsdcompat) || ok_blook(bsdmsgs)) ? 0 : GCOMMA;
1611
1612    if (gflags & GTO)
1613       hp->h_to = grab_names("To: ", hp->h_to, comma, GTO | GFULL);
1614    if (subjfirst && (gflags & GSUBJECT))
1615       hp->h_subject = readstr_input("Subject: ", hp->h_subject);
1616    if (gflags & GCC)
1617       hp->h_cc = grab_names("Cc: ", hp->h_cc, comma, GCC | GFULL);
1618    if (gflags & GBCC)
1619       hp->h_bcc = grab_names("Bcc: ", hp->h_bcc, comma, GBCC | GFULL);
1620
1621    if (gflags & GEXTRA) {
1622       if (hp->h_from == NULL)
1623          hp->h_from = lextract(myaddrs(hp), GEXTRA | GFULL);
1624       hp->h_from = grab_names("From: ", hp->h_from, comma, GEXTRA | GFULL);
1625       if (hp->h_replyto == NULL)
1626          hp->h_replyto = lextract(ok_vlook(replyto), GEXTRA | GFULL);
1627       hp->h_replyto = grab_names("Reply-To: ", hp->h_replyto, comma,
1628             GEXTRA | GFULL);
1629       if (hp->h_sender == NULL)
1630          hp->h_sender = extract(ok_vlook(sender), GEXTRA | GFULL);
1631       hp->h_sender = grab_names("Sender: ", hp->h_sender, comma,
1632             GEXTRA | GFULL);
1633       if (hp->h_organization == NULL)
1634          hp->h_organization = ok_vlook(ORGANIZATION);
1635       hp->h_organization = readstr_input("Organization: ", hp->h_organization);
1636    }
1637
1638    if (!subjfirst && (gflags & GSUBJECT))
1639       hp->h_subject = readstr_input("Subject: ", hp->h_subject);
1640
1641    NYD_LEAVE;
1642    return errs;
1643 }
1644
1645 /* vim:set fenc=utf-8:s-it-mode */