usr.bin/mail/aux.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)aux.c    8.1 (Berkeley) 6/6/93
  34  * $FreeBSD: src/usr.bin/mail/aux.c,v 1.4.6.4 2003/01/06 05:46:03 mikeh Exp $
  35  * $DragonFly: src/usr.bin/mail/aux.c,v 1.4 2004/09/08 03:01:11 joerg Exp $
  36  */
  37
  38 #include <sys/time.h>
  39
  40 #include "rcv.h"
  41 #include "extern.h"
  42
  43 /*
  44  * Mail -- a mail program
  45  *
  46  * Auxiliary functions.
  47  */
  48
  49 static char *save2str(char *, char *);
  50
  51 /*
  52  * Return a pointer to a dynamic copy of the argument.
  53  */
  54 char *
  55 savestr(char *str)
  56 {
  57         char *new;
  58         int size = strlen(str) + 1;
  59
  60         if ((new = salloc(size)) != NULL)
  61                 bcopy(str, new, size);
  62         return (new);
  63 }
  64
  65 /*
  66  * Make a copy of new argument incorporating old one.
  67  */
  68 char *
  69 save2str(char *str, char *old)
  70 {
  71         char *new;
  72         int newsize = strlen(str) + 1;
  73         int oldsize = old ? strlen(old) + 1 : 0;
  74
  75         if ((new = salloc(newsize + oldsize)) != NULL) {
  76                 if (oldsize) {
  77                         bcopy(old, new, oldsize);
  78                         new[oldsize - 1] = ' ';
  79                 }
  80                 bcopy(str, new + oldsize, newsize);
  81         }
  82         return (new);
  83 }
  84
  85 /*
  86  * Touch the named message by setting its MTOUCH flag.
  87  * Touched messages have the effect of not being sent
  88  * back to the system mailbox on exit.
  89  */
  90 void
  91 touch(struct message *mp)
  92 {
  93         mp->m_flag |= MTOUCH;
  94         if ((mp->m_flag & MREAD) == 0)
  95                 mp->m_flag |= MREAD|MSTATUS;
  96 }
  97
  98 /*
  99  * Test to see if the passed file name is a directory.
 100  * Return true if it is.
 101  */
 102 int
 103 isdir(char *name)
 104 {
 105         struct stat sbuf;
 106
 107         if (stat(name, &sbuf) < 0)
 108                 return (0);
 109         return (S_ISDIR(sbuf.st_mode));
 110 }
 111
 112 /*
 113  * Count the number of arguments in the given string raw list.
 114  */
 115 int
 116 argcount(char **argv)
 117 {
 118         char **ap;
 119
 120         for (ap = argv; *ap++ != NULL;)
 121                 ;
 122         return (ap - argv - 1);
 123 }
 124
 125 /*
 126  * Return the desired header line from the passed message
 127  * pointer (or NULL if the desired header field is not available).
 128  */
 129 char *
 130 hfield(const char *field, struct message *mp)
 131 {
 132         FILE *ibuf;
 133         char linebuf[LINESIZE];
 134         int lc;
 135         char *hfield;
 136         char *colon, *oldhfield = NULL;
 137
 138         ibuf = setinput(mp);
 139         if ((lc = mp->m_lines - 1) < 0)
 140                 return (NULL);
 141         if (readline(ibuf, linebuf, LINESIZE) < 0)
 142                 return (NULL);
 143         while (lc > 0) {
 144                 if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0)
 145                         return (oldhfield);
 146                 if ((hfield = ishfield(linebuf, colon, field)) != NULL)
 147                         oldhfield = save2str(hfield, oldhfield);
 148         }
 149         return (oldhfield);
 150 }
 151
 152 /*
 153  * Return the next header field found in the given message.
 154  * Return >= 0 if something found, < 0 elsewise.
 155  * "colon" is set to point to the colon in the header.
 156  * Must deal with \ continuations & other such fraud.
 157  */
 158 int
 159 gethfield(FILE *f, char *linebuf, int rem, char **colon)
 160 {
 161         char line2[LINESIZE];
 162         char *cp, *cp2;
 163         int c;
 164
 165         for (;;) {
 166                 if (--rem < 0)
 167                         return (-1);
 168                 if ((c = readline(f, linebuf, LINESIZE)) <= 0)
 169                         return (-1);
 170                 for (cp = linebuf; isprint((unsigned char)*cp) && *cp != ' ' && *cp != ':';
 171                     cp++)
 172                         ;
 173                 if (*cp != ':' || cp == linebuf)
 174                         continue;
 175                 /*
 176                  * I guess we got a headline.
 177                  * Handle wraparounding
 178                  */
 179                 *colon = cp;
 180                 cp = linebuf + c;
 181                 for (;;) {
 182                         while (--cp >= linebuf && (*cp == ' ' || *cp == '\t'))
 183                                 ;
 184                         cp++;
 185                         if (rem <= 0)
 186                                 break;
 187                         ungetc(c = getc(f), f);
 188                         if (c != ' ' && c != '\t')
 189                                 break;
 190                         if ((c = readline(f, line2, LINESIZE)) < 0)
 191                                 break;
 192                         rem--;
 193                         for (cp2 = line2; *cp2 == ' ' || *cp2 == '\t'; cp2++)
 194                                 ;
 195                         c -= cp2 - line2;
 196                         if (cp + c >= linebuf + LINESIZE - 2)
 197                                 break;
 198                         *cp++ = ' ';
 199                         bcopy(cp2, cp, c);
 200                         cp += c;
 201                 }
 202                 *cp = 0;
 203                 return (rem);
 204         }
 205         /* NOTREACHED */
 206 }
 207
 208 /*
 209  * Check whether the passed line is a header line of
 210  * the desired breed.  Return the field body, or 0.
 211  */
 212
 213 char*
 214 ishfield(char *linebuf, char *colon, const char *field)
 215 {
 216         char *cp = colon;
 217
 218         *cp = 0;
 219         if (strcasecmp(linebuf, field) != 0) {
 220                 *cp = ':';
 221                 return (0);
 222         }
 223         *cp = ':';
 224         for (cp++; *cp == ' ' || *cp == '\t'; cp++)
 225                 ;
 226         return (cp);
 227 }
 228
 229 /*
 230  * Copy a string and lowercase the result.
 231  * dsize: space left in buffer (including space for NULL)
 232  */
 233 void
 234 istrncpy(char *dest, const char *src, size_t dsize)
 235 {
 236
 237         strlcpy(dest, src, dsize);
 238         while (*dest)
 239                 *dest++ = tolower((unsigned char)*dest);
 240 }
 241
 242 /*
 243  * The following code deals with input stacking to do source
 244  * commands.  All but the current file pointer are saved on
 245  * the stack.
 246  */
 247
 248 static  int     ssp;                    /* Top of file stack */
 249 struct sstack {
 250         FILE    *s_file;                /* File we were in. */
 251         int     s_cond;                 /* Saved state of conditionals */
 252         int     s_loading;              /* Loading .mailrc, etc. */
 253 };
 254 #define SSTACK_SIZE     64              /* XXX was NOFILE. */
 255 static struct sstack sstack[SSTACK_SIZE];
 256
 257 /*
 258  * Pushdown current input file and switch to a new one.
 259  * Set the global flag "sourcing" so that others will realize
 260  * that they are no longer reading from a tty (in all probability).
 261  */
 262 int
 263 source(char **arglist)
 264 {
 265         FILE *fi;
 266         char *cp;
 267
 268         if ((cp = expand(*arglist)) == NULL)
 269                 return (1);
 270         if ((fi = Fopen(cp, "r")) == NULL) {
 271                 warn("%s", cp);
 272                 return (1);
 273         }
 274         if (ssp >= SSTACK_SIZE - 1) {
 275                 printf("Too much \"sourcing\" going on.\n");
 276                 Fclose(fi);
 277                 return (1);
 278         }
 279         sstack[ssp].s_file = input;
 280         sstack[ssp].s_cond = cond;
 281         sstack[ssp].s_loading = loading;
 282         ssp++;
 283         loading = 0;
 284         cond = CANY;
 285         input = fi;
 286         sourcing++;
 287         return (0);
 288 }
 289
 290 /*
 291  * Pop the current input back to the previous level.
 292  * Update the "sourcing" flag as appropriate.
 293  */
 294 int
 295 unstack(void)
 296 {
 297         if (ssp <= 0) {
 298                 printf("\"Source\" stack over-pop.\n");
 299                 sourcing = 0;
 300                 return (1);
 301         }
 302         Fclose(input);
 303         if (cond != CANY)
 304                 printf("Unmatched \"if\"\n");
 305         ssp--;
 306         cond = sstack[ssp].s_cond;
 307         loading = sstack[ssp].s_loading;
 308         input = sstack[ssp].s_file;
 309         if (ssp == 0)
 310                 sourcing = loading;
 311         return (0);
 312 }
 313
 314 /*
 315  * Touch the indicated file.
 316  * This is nifty for the shell.
 317  */
 318 void
 319 alter(char *name)
 320 {
 321         struct stat sb;
 322         struct timeval tv[2];
 323
 324         if (stat(name, &sb))
 325                 return;
 326         gettimeofday(&tv[0], (struct timezone *)NULL);
 327         tv[0].tv_sec++;
 328         TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
 329         utimes(name, tv);
 330 }
 331
 332 /*
 333  * Get sender's name from this message.  If the message has
 334  * a bunch of arpanet stuff in it, we may have to skin the name
 335  * before returning it.
 336  */
 337 char *
 338 nameof(struct message *mp, int reptype)
 339 {
 340         char *cp, *cp2;
 341
 342         cp = skin(name1(mp, reptype));
 343         if (reptype != 0 || charcount(cp, '!') < 2)
 344                 return (cp);
 345         cp2 = strrchr(cp, '!');
 346         cp2--;
 347         while (cp2 > cp && *cp2 != '!')
 348                 cp2--;
 349         if (*cp2 == '!')
 350                 return (cp2 + 1);
 351         return (cp);
 352 }
 353
 354 /*
 355  * Start of a "comment".
 356  * Ignore it.
 357  */
 358 char *
 359 skip_comment(char *cp)
 360 {
 361         int nesting = 1;
 362
 363         for (; nesting > 0 && *cp; cp++) {
 364                 switch (*cp) {
 365                 case '\\':
 366                         if (cp[1])
 367                                 cp++;
 368                         break;
 369                 case '(':
 370                         nesting++;
 371                         break;
 372                 case ')':
 373                         nesting--;
 374                         break;
 375                 }
 376         }
 377         return (cp);
 378 }
 379
 380 /*
 381  * Skin an arpa net address according to the RFC 822 interpretation
 382  * of "host-phrase."
 383  */
 384 char *
 385 skin(char *name)
 386 {
 387         char *nbuf, *bufend, *cp, *cp2;
 388         int c, gotlt, lastsp;
 389
 390         if (name == NULL)
 391                 return (NULL);
 392         if (strchr(name, '(') == NULL && strchr(name, '<') == NULL
 393             && strchr(name, ' ') == NULL)
 394                 return (name);
 395
 396         /* We assume that length(input) <= length(output) */
 397         if ((nbuf = malloc(strlen(name) + 1)) == NULL)
 398                 err(1, "Out of memory");
 399         gotlt = 0;
 400         lastsp = 0;
 401         bufend = nbuf;
 402         for (cp = name, cp2 = bufend; (c = *cp++) != '\0'; ) {
 403                 switch (c) {
 404                 case '(':
 405                         cp = skip_comment(cp);
 406                         lastsp = 0;
 407                         break;
 408
 409                 case '"':
 410                         /*
 411                          * Start of a "quoted-string".
 412                          * Copy it in its entirety.
 413                          */
 414                         while ((c = *cp) != '\0') {
 415                                 cp++;
 416                                 if (c == '"')
 417                                         break;
 418                                 if (c != '\\')
 419                                         *cp2++ = c;
 420                                 else if ((c = *cp) != '\0') {
 421                                         *cp2++ = c;
 422                                         cp++;
 423                                 }
 424                         }
 425                         lastsp = 0;
 426                         break;
 427
 428                 case ' ':
 429                         if (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ')
 430                                 cp += 3, *cp2++ = '@';
 431                         else
 432                         if (cp[0] == '@' && cp[1] == ' ')
 433                                 cp += 2, *cp2++ = '@';
 434                         else
 435                                 lastsp = 1;
 436                         break;
 437
 438                 case '<':
 439                         cp2 = bufend;
 440                         gotlt++;
 441                         lastsp = 0;
 442                         break;
 443
 444                 case '>':
 445                         if (gotlt) {
 446                                 gotlt = 0;
 447                                 while ((c = *cp) != '\0' && c != ',') {
 448                                         cp++;
 449                                         if (c == '(')
 450                                                 cp = skip_comment(cp);
 451                                         else if (c == '"')
 452                                                 while ((c = *cp) != '\0') {
 453                                                         cp++;
 454                                                         if (c == '"')
 455                                                                 break;
 456                                                         if (c == '\\' && *cp != '\0')
 457                                                                 cp++;
 458                                                 }
 459                                 }
 460                                 lastsp = 0;
 461                                 break;
 462                         }
 463                         /* FALLTHROUGH */
 464
 465                 default:
 466                         if (lastsp) {
 467                                 lastsp = 0;
 468                                 *cp2++ = ' ';
 469                         }
 470                         *cp2++ = c;
 471                         if (c == ',' && *cp == ' ' && !gotlt) {
 472                                 *cp2++ = ' ';
 473                                 while (*++cp == ' ')
 474                                         ;
 475                                 lastsp = 0;
 476                                 bufend = cp2;
 477                         }
 478                 }
 479         }
 480         *cp2 = '\0';
 481
 482         if ((cp = realloc(nbuf, strlen(nbuf) + 1)) != NULL)
 483                 nbuf = cp;
 484         return (nbuf);
 485 }
 486
 487 /*
 488  * Fetch the sender's name from the passed message.
 489  * Reptype can be
 490  *      0 -- get sender's name for display purposes
 491  *      1 -- get sender's name for reply
 492  *      2 -- get sender's name for Reply
 493  */
 494 char *
 495 name1(struct message *mp, int reptype)
 496 {
 497         char namebuf[LINESIZE];
 498         char linebuf[LINESIZE];
 499         char *cp, *cp2;
 500         FILE *ibuf;
 501         int first = 1;
 502
 503         if ((cp = hfield("from", mp)) != NULL)
 504                 return (cp);
 505         if (reptype == 0 && (cp = hfield("sender", mp)) != NULL)
 506                 return (cp);
 507         ibuf = setinput(mp);
 508         namebuf[0] = '\0';
 509         if (readline(ibuf, linebuf, LINESIZE) < 0)
 510                 return (savestr(namebuf));
 511 newname:
 512         for (cp = linebuf; *cp != '\0' && *cp != ' '; cp++)
 513                 ;
 514         for (; *cp == ' ' || *cp == '\t'; cp++)
 515                 ;
 516         for (cp2 = &namebuf[strlen(namebuf)];
 517             *cp != '\0' && *cp != ' ' && *cp != '\t' &&
 518             cp2 < namebuf + LINESIZE - 1;)
 519                 *cp2++ = *cp++;
 520         *cp2 = '\0';
 521         if (readline(ibuf, linebuf, LINESIZE) < 0)
 522                 return (savestr(namebuf));
 523         if ((cp = strchr(linebuf, 'F')) == NULL)
 524                 return (savestr(namebuf));
 525         if (strncmp(cp, "From", 4) != 0)
 526                 return (savestr(namebuf));
 527         while ((cp = strchr(cp, 'r')) != NULL) {
 528                 if (strncmp(cp, "remote", 6) == 0) {
 529                         if ((cp = strchr(cp, 'f')) == NULL)
 530                                 break;
 531                         if (strncmp(cp, "from", 4) != 0)
 532                                 break;
 533                         if ((cp = strchr(cp, ' ')) == NULL)
 534                                 break;
 535                         cp++;
 536                         if (first) {
 537                                 cp2 = namebuf;
 538                                 first = 0;
 539                         } else
 540                                 cp2 = strrchr(namebuf, '!') + 1;
 541                         strlcpy(cp2, cp, sizeof(namebuf) - (cp2 - namebuf) - 1);
 542                         strcat(namebuf, "!");
 543                         goto newname;
 544                 }
 545                 cp++;
 546         }
 547         return (savestr(namebuf));
 548 }
 549
 550 /*
 551  * Count the occurances of c in str
 552  */
 553 int
 554 charcount(char *str, int c)
 555 {
 556         char *cp;
 557         int i;
 558
 559         for (i = 0, cp = str; *cp != '\0'; cp++)
 560                 if (*cp == c)
 561                         i++;
 562         return (i);
 563 }
 564
 565 /*
 566  * See if the given header field is supposed to be ignored.
 567  */
 568 int
 569 isign(const char *field, struct ignoretab ignore[2])
 570 {
 571         char realfld[LINESIZE];
 572
 573         if (ignore == ignoreall)
 574                 return (1);
 575         /*
 576          * Lower-case the string, so that "Status" and "status"
 577          * will hash to the same place.
 578          */
 579         istrncpy(realfld, field, sizeof(realfld));
 580         if (ignore[1].i_count > 0)
 581                 return (!member(realfld, ignore + 1));
 582         else
 583                 return (member(realfld, ignore));
 584 }
 585
 586 int
 587 member(char *realfield, struct ignoretab *table)
 588 {
 589         struct ignore *igp;
 590
 591         for (igp = table->i_head[hash(realfield)]; igp != NULL; igp = igp->i_link)
 592                 if (*igp->i_field == *realfield &&
 593                     equal(igp->i_field, realfield))
 594                         return (1);
 595         return (0);
 596 }