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