usr.bin/mail/support.c

   1 /*      $NetBSD: support.c,v 1.21 2008/04/24 01:27:07 christos Exp $    */
   2
   3 /*
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)aux.c       8.1 (Berkeley) 6/6/93";
  36 #else
  37 __RCSID("$NetBSD: support.c,v 1.21 2008/04/24 01:27:07 christos Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <stdarg.h>
  42 #include <util.h>
  43
  44 #include "rcv.h"
  45 #include "extern.h"
  46 #include "mime.h"
  47 #include "thread.h"
  48
  49 /*
  50  * Mail -- a mail program
  51  *
  52  * Auxiliary functions.
  53  */
  54
  55
  56 /*
  57  * Return a pointer to a dynamic copy of the argument.
  58  */
  59 PUBLIC char *
  60 savestr(const char *str)
  61 {
  62         char *new;
  63         size_t size = strlen(str) + 1;
  64
  65         if ((new = salloc(size)) != NULL)
  66                 (void)memmove(new, str, size);
  67         return new;
  68 }
  69
  70 /*
  71  * Make a copy of new argument incorporating old one.
  72  */
  73 static char *
  74 save2str(char *str, char *old)
  75 {
  76         char *new;
  77         size_t newsize = strlen(str) + 1;
  78         size_t oldsize = old ? strlen(old) + 1 : 0;
  79
  80         if ((new = salloc(newsize + oldsize)) != NULL) {
  81                 if (oldsize) {
  82                         (void)memmove(new, old, oldsize);
  83                         new[oldsize - 1] = ' ';
  84                 }
  85                 (void)memmove(new + oldsize, str, newsize);
  86         }
  87         return new;
  88 }
  89
  90 /*
  91  * Like asprintf(), but with result salloc-ed rather than malloc-ed.
  92  */
  93 PUBLIC int
  94 sasprintf(char **ret, const char *format, ...)
  95 {
  96         int rval;
  97         char *p;
  98         va_list args;
  99
 100         va_start(args, format);
 101         rval = evasprintf(&p, format, args);
 102         *ret = savestr(p);
 103         free(p);
 104         va_end(args);
 105         return rval;
 106 }
 107
 108 struct set_m_flag_args_s {
 109         int and_bits;
 110         int xor_bits;
 111 };
 112 static int
 113 set_m_flag_core(struct message *mp, void *v)
 114 {
 115         struct set_m_flag_args_s *args;
 116         args = v;
 117         mp->m_flag &= args->and_bits;
 118         mp->m_flag ^= args->xor_bits;
 119         return 0;
 120 }
 121
 122 PUBLIC struct message *
 123 set_m_flag(int msgnum, int and_bits, int xor_bits)
 124 {
 125         struct message *mp;
 126         struct set_m_flag_args_s args;
 127         mp = get_message(msgnum);
 128         args.and_bits = and_bits;
 129         args.xor_bits = xor_bits;
 130         (void)thread_recursion(mp, set_m_flag_core, &args);
 131         return mp;
 132 }
 133
 134 /*
 135  * Touch the named message by setting its MTOUCH flag.
 136  * Touched messages have the effect of not being sent
 137  * back to the system mailbox on exit.
 138  */
 139 PUBLIC void
 140 touch(struct message *mp)
 141 {
 142
 143         mp->m_flag |= MTOUCH;
 144         if ((mp->m_flag & MREAD) == 0)
 145                 mp->m_flag |= MREAD|MSTATUS;
 146 }
 147
 148 /*
 149  * Test to see if the passed file name is a directory.
 150  * Return true if it is.
 151  */
 152 PUBLIC int
 153 isdir(const char name[])
 154 {
 155         struct stat sbuf;
 156
 157         if (stat(name, &sbuf) < 0)
 158                 return 0;
 159         return S_ISDIR(sbuf.st_mode);
 160 }
 161
 162 /*
 163  * Count the number of arguments in the given string raw list.
 164  */
 165 PUBLIC int
 166 argcount(char **argv)
 167 {
 168         char **ap;
 169
 170         for (ap = argv; *ap++ != NULL; /*EMPTY*/)
 171                 continue;
 172         return (int)(ap - argv - 1);
 173 }
 174
 175 /*
 176  * Check whether the passed line is a header line of
 177  * the desired breed.  Return the field body, or NULL.
 178  */
 179 static char*
 180 ishfield(const char linebuf[], char *colon, const char field[])
 181 {
 182         char *cp = colon;
 183
 184         *cp = 0;
 185         if (strcasecmp(linebuf, field) != 0) {
 186                 *cp = ':';
 187                 return NULL;
 188         }
 189         *cp = ':';
 190         for (cp++; is_WSP(*cp); cp++)
 191                 continue;
 192         return cp;
 193 }
 194
 195 /*
 196  * Return the next header field found in the given message.
 197  * Return >= 0 if something found, < 0 elsewise.
 198  * "colon" is set to point to the colon in the header.
 199  * Must deal with \ continuations & other such fraud.
 200  *
 201  * WARNING - do not call this outside hfield() or decoding will not
 202  *           get done.
 203  */
 204 static int
 205 gethfield(FILE *f, char linebuf[], int rem, char **colon)
 206 {
 207         char line2[LINESIZE];
 208         char *cp, *cp2;
 209         int c;
 210
 211         for (;;) {
 212                 if (--rem < 0)
 213                         return -1;
 214                 if ((c = readline(f, linebuf, LINESIZE, 0)) <= 0)
 215                         return -1;
 216                 for (cp = linebuf;
 217                      isprint((unsigned char)*cp) && *cp != ' ' && *cp != ':';
 218                      cp++)
 219                         continue;
 220                 if (*cp != ':' || cp == linebuf)
 221                         continue;
 222                 /*
 223                  * I guess we got a headline.
 224                  * Handle wraparounding
 225                  */
 226                 *colon = cp;
 227                 cp = linebuf + c;
 228                 for (;;) {
 229                         while (--cp >= linebuf && is_WSP(*cp))
 230                                 continue;
 231                         cp++;
 232                         if (rem <= 0)
 233                                 break;
 234                         (void)ungetc(c = getc(f), f);
 235                         if (!is_WSP(c))
 236                                 break;
 237                         if ((c = readline(f, line2, LINESIZE, 0)) < 0)
 238                                 break;
 239                         rem--;
 240                         cp2 = skip_WSP(line2);
 241                         c -= (int)(cp2 - line2);
 242                         if (cp + c >= linebuf + LINESIZE - 2)
 243                                 break;
 244                         *cp++ = ' ';
 245                         (void)memmove(cp, cp2, (size_t)c);
 246                         cp += c;
 247                 }
 248                 *cp = 0;
 249                 return rem;
 250         }
 251         /* NOTREACHED */
 252 }
 253
 254 /*
 255  * Return the desired header line from the passed message
 256  * pointer (or NULL if the desired header field is not available).
 257  */
 258 PUBLIC char *
 259 hfield(const char field[], const struct message *mp)
 260 {
 261         FILE *ibuf;
 262         char linebuf[LINESIZE];
 263         int lc;
 264         char *headerfield;
 265         char *colon, *oldhfield = NULL;
 266 #ifdef MIME_SUPPORT
 267         int decode;
 268
 269         decode = value(ENAME_MIME_DECODE_MSG) &&
 270             value(ENAME_MIME_DECODE_HDR);
 271 #endif
 272
 273         ibuf = setinput(mp);
 274         if ((lc = (int)(mp->m_lines - 1)) < 0)
 275                 return NULL;
 276         if (readline(ibuf, linebuf, LINESIZE, 0) < 0)
 277                 return NULL;
 278         while (lc > 0) {
 279                 if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0)
 280                         return oldhfield;
 281 #ifdef MIME_SUPPORT
 282                 if ((headerfield = ishfield(linebuf, colon, field)) != NULL) {
 283                         char linebuf2[LINESIZE];
 284                         if (decode)
 285                                 headerfield = mime_decode_hfield(linebuf2,
 286                                     sizeof(linebuf2), linebuf, headerfield);
 287                         oldhfield = save2str(headerfield, oldhfield);
 288                 }
 289 #else
 290                 if ((headerfield = ishfield(linebuf, colon, field)) != NULL)
 291                         oldhfield = save2str(headerfield, oldhfield);
 292 #endif
 293         }
 294         return oldhfield;
 295 }
 296
 297 /*
 298  * Copy a string, lowercasing it as we go.
 299  */
 300 PUBLIC void
 301 istrcpy(char *dest, const char *src)
 302 {
 303
 304         do {
 305                 *dest++ = tolower((unsigned char)*src);
 306         } while (*src++ != 0);
 307 }
 308
 309 /*
 310  * The following code deals with input stacking to do source
 311  * commands.  All but the current file pointer are saved on
 312  * the stack.
 313  */
 314
 315 static  int     ssp;                    /* Top of file stack */
 316 static struct sstack {
 317         FILE    *s_file;                /* File we were in. */
 318         int     s_cond;                 /* Saved state of conditionals */
 319 #ifdef NEW_CONDITIONAL
 320         struct cond_stack_s *s_cond_stack; /* Saved conditional stack */
 321 #endif
 322         int     s_loading;              /* Loading .mailrc, etc. */
 323 } sstack[NOFILE];
 324
 325 /*
 326  * Pushdown current input file and switch to a new one.
 327  * Set the global flag "sourcing" so that others will realize
 328  * that they are no longer reading from a tty (in all probability).
 329  */
 330 PUBLIC int
 331 source(void *v)
 332 {
 333         char **arglist = v;
 334         FILE *fi;
 335         const char *cp;
 336
 337         if ((cp = expand(*arglist)) == NULL)
 338                 return 1;
 339         if ((fi = Fopen(cp, "r")) == NULL) {
 340                 warn("%s", cp);
 341                 return 1;
 342         }
 343         if (ssp >= NOFILE - 1) {
 344                 (void)printf("Too much \"sourcing\" going on.\n");
 345                 (void)Fclose(fi);
 346                 return 1;
 347         }
 348         sstack[ssp].s_file = input;
 349         sstack[ssp].s_cond = cond;
 350 #ifdef NEW_CONDITIONAL
 351         sstack[ssp].s_cond_stack = cond_stack;
 352 #endif
 353         sstack[ssp].s_loading = loading;
 354         ssp++;
 355         loading = 0;
 356         cond = CNONE;
 357         input = fi;
 358         sourcing++;
 359         return 0;
 360 }
 361
 362 /*
 363  * Pop the current input back to the previous level.
 364  * Update the "sourcing" flag as appropriate.
 365  */
 366 PUBLIC int
 367 unstack(void)
 368 {
 369         if (ssp <= 0) {
 370                 (void)printf("\"Source\" stack over-pop.\n");
 371                 sourcing = 0;
 372                 return 1;
 373         }
 374         (void)Fclose(input);
 375         if (cond != CNONE || cond_stack != NULL)
 376                 (void)printf("Unmatched \"if\"\n");
 377         ssp--;
 378         input = sstack[ssp].s_file;
 379         cond = sstack[ssp].s_cond;
 380 #ifdef NEW_CONDITIONAL
 381         cond_stack = sstack[ssp].s_cond_stack;
 382 #endif
 383         loading = sstack[ssp].s_loading;
 384         if (ssp == 0)
 385                 sourcing = loading;
 386         return 0;
 387 }
 388
 389 /*
 390  * Touch the indicated file.
 391  * This is nifty for the shell.
 392  */
 393 PUBLIC void
 394 alter(char *name)
 395 {
 396         struct stat sb;
 397         struct timeval tv[2];
 398
 399         if (stat(name, &sb))
 400                 return;
 401         (void)gettimeofday(&tv[0], NULL);
 402         tv[0].tv_sec++;
 403         TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
 404         (void)utimes(name, tv);
 405 }
 406
 407 /*
 408  * Examine the passed line buffer and
 409  * return true if it is all blanks and tabs.
 410  */
 411 PUBLIC int
 412 blankline(char linebuf[])
 413 {
 414         char *cp;
 415
 416         for (cp = linebuf; *cp; cp++)
 417                 if (!is_WSP(*cp))
 418                         return 0;
 419         return 1;
 420 }
 421
 422 /*
 423  * Start of a "comment".
 424  * Ignore it.
 425  */
 426 static char *
 427 skip_comment(char *cp)
 428 {
 429         int nesting = 1;
 430
 431         for (/*EMPTY*/; nesting > 0 && *cp; cp++) {
 432                 switch (*cp) {
 433                 case '\\':
 434                         if (cp[1])
 435                                 cp++;
 436                         break;
 437                 case '(':
 438                         nesting++;
 439                         break;
 440                 case ')':
 441                         nesting--;
 442                         break;
 443                 }
 444         }
 445         return cp;
 446 }
 447
 448 /*
 449  * Skin an arpa net address according to the RFC 822 interpretation
 450  * of "host-phrase."
 451  */
 452 PUBLIC char *
 453 skin(char *name)
 454 {
 455         int c;
 456         char *cp, *cp2;
 457         char *bufend;
 458         int gotlt, lastsp;
 459         char nbuf[LINESIZE];
 460
 461         if (name == NULL)
 462                 return NULL;
 463         if (strchr(name, '(') == NULL && strchr(name, '<') == NULL
 464             && strchr(name, ' ') == NULL)
 465                 return name;
 466         gotlt = 0;
 467         lastsp = 0;
 468         bufend = nbuf;
 469         for (cp = name, cp2 = bufend; (c = *cp++) != '\0'; /*EMPTY*/) {
 470                 switch (c) {
 471                 case '(':
 472                         cp = skip_comment(cp);
 473                         lastsp = 0;
 474                         break;
 475
 476                 case '"':
 477                         /*
 478                          * Start of a "quoted-string".
 479                          * Copy it in its entirety.
 480                          */
 481                         while ((c = *cp) != '\0') {
 482                                 cp++;
 483                                 if (c == '"')
 484                                         break;
 485                                 if (c != '\\')
 486                                         *cp2++ = c;
 487                                 else if ((c = *cp) != '\0') {
 488                                         *cp2++ = c;
 489                                         cp++;
 490                                 }
 491                         }
 492                         lastsp = 0;
 493                         break;
 494
 495                 case ' ':
 496                         if (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ')
 497                                 cp += 3, *cp2++ = '@';
 498                         else
 499                         if (cp[0] == '@' && cp[1] == ' ')
 500                                 cp += 2, *cp2++ = '@';
 501                         else
 502                                 lastsp = 1;
 503                         break;
 504
 505                 case '<':
 506                         cp2 = bufend;
 507                         gotlt++;
 508                         lastsp = 0;
 509                         break;
 510
 511                 case '>':
 512                         if (gotlt) {
 513                                 gotlt = 0;
 514                                 while ((c = *cp) && c != ',') {
 515                                         cp++;
 516                                         if (c == '(')
 517                                                 cp = skip_comment(cp);
 518                                         else if (c == '"')
 519                                                 while ((c = *cp) != '\0') {
 520                                                         cp++;
 521                                                         if (c == '"')
 522                                                                 break;
 523                                                         if (c == '\\' && *cp)
 524                                                                 cp++;
 525                                                 }
 526                                 }
 527                                 lastsp = 0;
 528                                 break;
 529                         }
 530                         /* FALLTHROUGH */
 531
 532                 default:
 533                         if (lastsp) {
 534                                 lastsp = 0;
 535                                 *cp2++ = ' ';
 536                         }
 537                         *cp2++ = c;
 538                         if (c == ',' && !gotlt) {
 539                                 *cp2++ = ' ';
 540                                 for (/*EMPTY*/; *cp == ' '; cp++)
 541                                         continue;
 542                                 lastsp = 0;
 543                                 bufend = cp2;
 544                         }
 545                 }
 546         }
 547         *cp2 = 0;
 548
 549         return savestr(nbuf);
 550 }
 551
 552 /*
 553  * Fetch the sender's name from the passed message.
 554  * Reptype can be
 555  *      0 -- get sender's name for display purposes
 556  *      1 -- get sender's name for reply
 557  *      2 -- get sender's name for Reply
 558  */
 559 static char *
 560 name1(struct message *mp, int reptype)
 561 {
 562         char namebuf[LINESIZE];
 563         char linebuf[LINESIZE];
 564         char *cp, *cp2;
 565         FILE *ibuf;
 566         int firstrun = 1;
 567
 568         if ((cp = hfield("from", mp)) != NULL)
 569                 return cp;
 570         if (reptype == 0 && (cp = hfield("sender", mp)) != NULL)
 571                 return cp;
 572         ibuf = setinput(mp);
 573         namebuf[0] = '\0';
 574         if (readline(ibuf, linebuf, LINESIZE, 0) < 0)
 575                 return savestr(namebuf);
 576  newname:
 577         for (cp = linebuf; *cp && *cp != ' '; cp++)
 578                 continue;
 579         cp = skip_WSP(cp);
 580         for (cp2 = &namebuf[strlen(namebuf)];
 581              *cp && !is_WSP(*cp) && cp2 < namebuf + LINESIZE - 1;
 582              /*EMPTY*/)
 583                 *cp2++ = *cp++;
 584         *cp2 = '\0';
 585         if (readline(ibuf, linebuf, LINESIZE, 0) < 0)
 586                 return savestr(namebuf);
 587         if ((cp = strchr(linebuf, 'F')) == NULL)
 588                 return savestr(namebuf);
 589         if (strncmp(cp, "From", 4) != 0)
 590                 return savestr(namebuf);
 591         while ((cp = strchr(cp, 'r')) != NULL) {
 592                 if (strncmp(cp, "remote", 6) == 0) {
 593                         if ((cp = strchr(cp, 'f')) == NULL)
 594                                 break;
 595                         if (strncmp(cp, "from", 4) != 0)
 596                                 break;
 597                         if ((cp = strchr(cp, ' ')) == NULL)
 598                                 break;
 599                         cp++;
 600                         if (firstrun) {
 601                                 cp2 = namebuf;
 602                                 firstrun = 0;
 603                         } else
 604                                 cp2 = strrchr(namebuf, '!') + 1;
 605                         while (*cp && cp2 < namebuf + LINESIZE - 1)
 606                                 *cp2++ = *cp++;
 607                         if (cp2 < namebuf + LINESIZE - 1)
 608                                 *cp2++ = '!';
 609                         *cp2 = '\0';
 610                         if (cp2 < namebuf + LINESIZE - 1)
 611                                 goto newname;
 612                         else
 613                                 break;
 614                 }
 615                 cp++;
 616         }
 617         return savestr(namebuf);
 618 }
 619
 620 /*
 621  * Count the occurrences of c in str
 622  */
 623 static int
 624 charcount(char *str, int c)
 625 {
 626         char *cp;
 627         int i;
 628
 629         for (i = 0, cp = str; *cp; cp++)
 630                 if (*cp == c)
 631                         i++;
 632         return i;
 633 }
 634
 635 /*
 636  * Get sender's name from this message.  If the message has
 637  * a bunch of arpanet stuff in it, we may have to skin the name
 638  * before returning it.
 639  */
 640 PUBLIC char *
 641 nameof(struct message *mp, int reptype)
 642 {
 643         char *cp, *cp2;
 644
 645         cp = skin(name1(mp, reptype));
 646         if (reptype != 0 || charcount(cp, '!') < 2)
 647                 return cp;
 648         cp2 = strrchr(cp, '!');
 649         cp2--;
 650         while (cp2 > cp && *cp2 != '!')
 651                 cp2--;
 652         if (*cp2 == '!')
 653                 return cp2 + 1;
 654         return cp;
 655 }
 656
 657 /*
 658  * Copy s1 to s2, return pointer to null in s2.
 659  */
 660 PUBLIC char *
 661 copy(char *s1, char *s2)
 662 {
 663
 664         while ((*s2++ = *s1++) != '\0')
 665                 continue;
 666         return s2 - 1;
 667 }
 668
 669 /*
 670  * The core routine to check the ignore table for a field.
 671  * Note: realfield should be lower-cased!
 672  */
 673 PUBLIC int
 674 member(char *realfield, struct ignoretab *table)
 675 {
 676         struct ignore *igp;
 677
 678         for (igp = table->i_head[hash(realfield)]; igp != 0; igp = igp->i_link)
 679                 if (*igp->i_field == *realfield &&
 680                     equal(igp->i_field, realfield))
 681                         return 1;
 682         return 0;
 683 }
 684
 685 /*
 686  * See if the given header field is supposed to be ignored.
 687  */
 688 PUBLIC int
 689 isign(const char *field, struct ignoretab ignoretabs[2])
 690 {
 691         char realfld[LINESIZE];
 692
 693         if (ignoretabs == ignoreall)
 694                 return 1;
 695         /*
 696          * Lower-case the string, so that "Status" and "status"
 697          * will hash to the same place.
 698          */
 699         istrcpy(realfld, field);
 700         if (ignoretabs[1].i_count > 0)
 701                 return !member(realfld, ignoretabs + 1);
 702         else
 703                 return member(realfld, ignoretabs);
 704 }
 705
 706 PUBLIC void
 707 add_ignore(const char *name, struct ignoretab *tab)
 708 {
 709         char field[LINESIZE];
 710         int h;
 711         struct ignore *igp;
 712
 713         istrcpy(field, name);
 714         if (member(field, tab))
 715                 return;
 716         h = hash(field);
 717         igp = ecalloc(1, sizeof(struct ignore));
 718         igp->i_field = ecalloc(strlen(field) + 1, sizeof(char));
 719         (void)strcpy(igp->i_field, field);
 720         igp->i_link = tab->i_head[h];
 721         tab->i_head[h] = igp;
 722         tab->i_count++;
 723 }
 724
 725 /*
 726  * Write a file to stdout, skipping comment lines.
 727  */
 728 PUBLIC void
 729 cathelp(const char *fname)
 730 {
 731         char *line;
 732         FILE *f;
 733         size_t len;
 734
 735         if ((f = Fopen(fname, "r")) == NULL) {
 736                 warn(fname);
 737                 return;
 738         }
 739         while ((line = fgetln(f, &len)) != NULL) {
 740                 if (*line == '#')
 741                         continue;
 742                 if (fwrite(line, 1, len, stdout) != len)
 743                         break;
 744         }
 745         (void)Fclose(f);
 746         return;
 747 }