1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 /* 33 * Mail -- a mail program 34 * 35 * Collect input from standard input, handling 36 * ~ escapes. 37 */ 38 39 #include "rcv.h" 40 #include <fcntl.h> 41 #include "extern.h" 42 43 /* 44 * Read a message from standard input and return a read file to it 45 * or NULL on error. 46 */ 47 48 /* 49 * The following hokiness with global variables is so that on 50 * receipt of an interrupt signal, the partial message can be salted 51 * away on dead.letter. 52 */ 53 54 static sig_t saveint; /* Previous SIGINT value */ 55 static sig_t savehup; /* Previous SIGHUP value */ 56 static sig_t savetstp; /* Previous SIGTSTP value */ 57 static sig_t savettou; /* Previous SIGTTOU value */ 58 static sig_t savettin; /* Previous SIGTTIN value */ 59 static FILE *collf; /* File for saving away */ 60 static int hadintr; /* Have seen one SIGINT so far */ 61 62 static jmp_buf colljmp; /* To get back to work */ 63 static int colljmp_p; /* whether to long jump */ 64 static jmp_buf collabort; /* To end collection with error */ 65 66 FILE * 67 collect(struct header *hp, int printheaders) 68 { 69 FILE *fbuf; 70 int lc, cc, escape, eofcount, fd, c, t; 71 char linebuf[LINESIZE], tempname[PATHSIZE], *cp, getsub; 72 sigset_t nset; 73 int longline, lastlong, rc; /* So we don't make 2 or more lines 74 out of a long input line. */ 75 76 collf = NULL; 77 /* 78 * Start catching signals from here, but we're still die on interrupts 79 * until we're in the main loop. 80 */ 81 (void)sigemptyset(&nset); 82 (void)sigaddset(&nset, SIGINT); 83 (void)sigaddset(&nset, SIGHUP); 84 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 85 if ((saveint = signal(SIGINT, SIG_IGN)) != SIG_IGN) 86 (void)signal(SIGINT, collint); 87 if ((savehup = signal(SIGHUP, SIG_IGN)) != SIG_IGN) 88 (void)signal(SIGHUP, collhup); 89 savetstp = signal(SIGTSTP, collstop); 90 savettou = signal(SIGTTOU, collstop); 91 savettin = signal(SIGTTIN, collstop); 92 if (setjmp(collabort) || setjmp(colljmp)) { 93 (void)rm(tempname); 94 goto err; 95 } 96 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 97 98 noreset++; 99 (void)snprintf(tempname, sizeof(tempname), 100 "%s/mail.RsXXXXXXXXXX", tmpdir); 101 if ((fd = mkstemp(tempname)) == -1 || 102 (collf = Fdopen(fd, "w+")) == NULL) { 103 warn("%s", tempname); 104 goto err; 105 } 106 (void)rm(tempname); 107 108 /* 109 * If we are going to prompt for a subject, 110 * refrain from printing a newline after 111 * the headers (since some people mind). 112 */ 113 t = GTO|GSUBJECT|GCC|GNL; 114 getsub = 0; 115 if (hp->h_subject == NULL && value("interactive") != NULL && 116 (value("ask") != NULL || value("asksub") != NULL)) 117 t &= ~GNL, getsub++; 118 if (printheaders) { 119 puthead(hp, stdout, t); 120 (void)fflush(stdout); 121 } 122 if ((cp = value("escape")) != NULL) 123 escape = *cp; 124 else 125 escape = ESCAPE; 126 eofcount = 0; 127 hadintr = 0; 128 longline = 0; 129 130 if (!setjmp(colljmp)) { 131 if (getsub) 132 grabh(hp, GSUBJECT); 133 } else { 134 /* 135 * Come here for printing the after-signal message. 136 * Duplicate messages won't be printed because 137 * the write is aborted if we get a SIGTTOU. 138 */ 139 cont: 140 if (hadintr) { 141 (void)fflush(stdout); 142 fprintf(stderr, 143 "\n(Interrupt -- one more to kill letter)\n"); 144 } else { 145 printf("(continue)\n"); 146 (void)fflush(stdout); 147 } 148 } 149 for (;;) { 150 colljmp_p = 1; 151 c = readline(stdin, linebuf, LINESIZE); 152 colljmp_p = 0; 153 if (c < 0) { 154 if (value("interactive") != NULL && 155 value("ignoreeof") != NULL && ++eofcount < 25) { 156 printf("Use \".\" to terminate letter\n"); 157 continue; 158 } 159 break; 160 } 161 lastlong = longline; 162 longline = c == LINESIZE - 1; 163 eofcount = 0; 164 hadintr = 0; 165 if (linebuf[0] == '.' && linebuf[1] == '\0' && 166 value("interactive") != NULL && !lastlong && 167 (value("dot") != NULL || value("ignoreeof") != NULL)) 168 break; 169 if (linebuf[0] != escape || value("interactive") == NULL || 170 lastlong) { 171 if (putline(collf, linebuf, !longline) < 0) 172 goto err; 173 continue; 174 } 175 c = linebuf[1]; 176 switch (c) { 177 default: 178 /* 179 * On double escape, just send the single one. 180 * Otherwise, it's an error. 181 */ 182 if (c == escape) { 183 if (putline(collf, &linebuf[1], !longline) < 0) 184 goto err; 185 else 186 break; 187 } 188 printf("Unknown tilde escape.\n"); 189 break; 190 case 'C': 191 /* 192 * Dump core. 193 */ 194 core(NULL); 195 break; 196 case '!': 197 /* 198 * Shell escape, send the balance of the 199 * line to sh -c. 200 */ 201 shell(&linebuf[2]); 202 break; 203 case ':': 204 case '_': 205 /* 206 * Escape to command mode, but be nice! 207 */ 208 execute(&linebuf[2], 1); 209 goto cont; 210 case '.': 211 /* 212 * Simulate end of file on input. 213 */ 214 goto out; 215 case 'q': 216 /* 217 * Force a quit of sending mail. 218 * Act like an interrupt happened. 219 */ 220 hadintr++; 221 collint(SIGINT); 222 exit(1); 223 case 'x': 224 /* 225 * Exit, do not save in dead.letter. 226 */ 227 goto err; 228 case 'h': 229 /* 230 * Grab a bunch of headers. 231 */ 232 grabh(hp, GTO|GSUBJECT|GCC|GBCC); 233 goto cont; 234 case 't': 235 /* 236 * Add to the To list. 237 */ 238 hp->h_to = cat(hp->h_to, extract(&linebuf[2], GTO)); 239 break; 240 case 's': 241 /* 242 * Set the Subject line. 243 */ 244 cp = &linebuf[2]; 245 while (isspace((unsigned char)*cp)) 246 cp++; 247 hp->h_subject = savestr(cp); 248 break; 249 case 'R': 250 /* 251 * Set the Reply-To line. 252 */ 253 cp = &linebuf[2]; 254 while (isspace((unsigned char)*cp)) 255 cp++; 256 hp->h_replyto = savestr(cp); 257 break; 258 case 'c': 259 /* 260 * Add to the CC list. 261 */ 262 hp->h_cc = cat(hp->h_cc, extract(&linebuf[2], GCC)); 263 break; 264 case 'b': 265 /* 266 * Add to the BCC list. 267 */ 268 hp->h_bcc = cat(hp->h_bcc, extract(&linebuf[2], GBCC)); 269 break; 270 case 'i': 271 case 'A': 272 case 'a': 273 /* 274 * Insert named variable in message. 275 */ 276 switch(c) { 277 case 'i': 278 cp = &linebuf[2]; 279 while(isspace((unsigned char)*cp)) 280 cp++; 281 break; 282 case 'a': 283 cp = "sign"; 284 break; 285 case 'A': 286 cp = "Sign"; 287 break; 288 default: 289 goto err; 290 } 291 292 if(*cp != '\0' && (cp = value(cp)) != NULL) { 293 printf("%s\n", cp); 294 if(putline(collf, cp, 1) < 0) 295 goto err; 296 } 297 298 break; 299 case 'd': 300 /* 301 * Read in the dead letter file. 302 */ 303 if (strlcpy(linebuf + 2, getdeadletter(), 304 sizeof(linebuf) - 2) 305 >= sizeof(linebuf) - 2) { 306 printf("Line buffer overflow\n"); 307 break; 308 } 309 /* FALLTHROUGH */ 310 case 'r': 311 case '<': 312 /* 313 * Invoke a file: 314 * Search for the file name, 315 * then open it and copy the contents to collf. 316 */ 317 cp = &linebuf[2]; 318 while (isspace((unsigned char)*cp)) 319 cp++; 320 if (*cp == '\0') { 321 printf("Interpolate what file?\n"); 322 break; 323 } 324 cp = expand(cp); 325 if (cp == NULL) 326 break; 327 if (*cp == '!') { 328 /* 329 * Insert stdout of command. 330 */ 331 char *sh; 332 int nullfd, tempfd, rc; 333 char tempname2[PATHSIZE]; 334 335 if ((nullfd = open(_PATH_DEVNULL, O_RDONLY, 0)) 336 == -1) { 337 warn(_PATH_DEVNULL); 338 break; 339 } 340 341 (void)snprintf(tempname2, sizeof(tempname2), 342 "%s/mail.ReXXXXXXXXXX", tmpdir); 343 if ((tempfd = mkstemp(tempname2)) == -1 || 344 (fbuf = Fdopen(tempfd, "w+")) == NULL) { 345 warn("%s", tempname2); 346 break; 347 } 348 (void)unlink(tempname2); 349 350 if ((sh = value("SHELL")) == NULL) 351 sh = _PATH_CSHELL; 352 353 rc = run_command(sh, 0, nullfd, fileno(fbuf), 354 "-c", cp+1, NULL); 355 356 close(nullfd); 357 358 if (rc < 0) { 359 (void)Fclose(fbuf); 360 break; 361 } 362 363 if (fsize(fbuf) == 0) { 364 fprintf(stderr, 365 "No bytes from command \"%s\"\n", 366 cp+1); 367 (void)Fclose(fbuf); 368 break; 369 } 370 371 rewind(fbuf); 372 } else if (isdir(cp)) { 373 printf("%s: Directory\n", cp); 374 break; 375 } else if ((fbuf = Fopen(cp, "r")) == NULL) { 376 warn("%s", cp); 377 break; 378 } 379 printf("\"%s\" ", cp); 380 (void)fflush(stdout); 381 lc = 0; 382 cc = 0; 383 while ((rc = readline(fbuf, linebuf, LINESIZE)) >= 0) { 384 if (rc != LINESIZE - 1) 385 lc++; 386 if ((t = putline(collf, linebuf, 387 rc != LINESIZE - 1)) < 0) { 388 (void)Fclose(fbuf); 389 goto err; 390 } 391 cc += t; 392 } 393 (void)Fclose(fbuf); 394 printf("%d/%d\n", lc, cc); 395 break; 396 case 'w': 397 /* 398 * Write the message on a file. 399 */ 400 cp = &linebuf[2]; 401 while (*cp == ' ' || *cp == '\t') 402 cp++; 403 if (*cp == '\0') { 404 fprintf(stderr, "Write what file!?\n"); 405 break; 406 } 407 if ((cp = expand(cp)) == NULL) 408 break; 409 rewind(collf); 410 exwrite(cp, collf, 1); 411 break; 412 case 'm': 413 case 'M': 414 case 'f': 415 case 'F': 416 /* 417 * Interpolate the named messages, if we 418 * are in receiving mail mode. Does the 419 * standard list processing garbage. 420 * If ~f is given, we don't shift over. 421 */ 422 if (forward(linebuf + 2, collf, tempname, c) < 0) 423 goto err; 424 goto cont; 425 case '?': 426 if ((fbuf = Fopen(_PATH_TILDE, "r")) == NULL) { 427 warn("%s", _PATH_TILDE); 428 break; 429 } 430 while ((t = getc(fbuf)) != EOF) 431 (void)putchar(t); 432 (void)Fclose(fbuf); 433 break; 434 case 'p': 435 /* 436 * Print out the current state of the 437 * message without altering anything. 438 */ 439 rewind(collf); 440 printf("-------\nMessage contains:\n"); 441 puthead(hp, stdout, GTO|GSUBJECT|GCC|GBCC|GNL); 442 while ((t = getc(collf)) != EOF) 443 (void)putchar(t); 444 goto cont; 445 case '|': 446 /* 447 * Pipe message through command. 448 * Collect output as new message. 449 */ 450 rewind(collf); 451 mespipe(collf, &linebuf[2]); 452 goto cont; 453 case 'v': 454 case 'e': 455 /* 456 * Edit the current message. 457 * 'e' means to use EDITOR 458 * 'v' means to use VISUAL 459 */ 460 rewind(collf); 461 mesedit(collf, c); 462 goto cont; 463 } 464 } 465 goto out; 466 err: 467 if (collf != NULL) { 468 (void)Fclose(collf); 469 collf = NULL; 470 } 471 out: 472 if (collf != NULL) 473 rewind(collf); 474 noreset--; 475 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 476 (void)signal(SIGINT, saveint); 477 (void)signal(SIGHUP, savehup); 478 (void)signal(SIGTSTP, savetstp); 479 (void)signal(SIGTTOU, savettou); 480 (void)signal(SIGTTIN, savettin); 481 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 482 return (collf); 483 } 484 485 /* 486 * Write a file, ex-like if f set. 487 */ 488 int 489 exwrite(char name[], FILE *fp, int f) 490 { 491 FILE *of; 492 int c, lc; 493 long cc; 494 struct stat junk; 495 496 if (f) { 497 printf("\"%s\" ", name); 498 (void)fflush(stdout); 499 } 500 if (stat(name, &junk) >= 0 && S_ISREG(junk.st_mode)) { 501 if (!f) 502 fprintf(stderr, "%s: ", name); 503 fprintf(stderr, "File exists\n"); 504 return (-1); 505 } 506 if ((of = Fopen(name, "w")) == NULL) { 507 warn((char *)NULL); 508 return (-1); 509 } 510 lc = 0; 511 cc = 0; 512 while ((c = getc(fp)) != EOF) { 513 cc++; 514 if (c == '\n') 515 lc++; 516 (void)putc(c, of); 517 if (ferror(of)) { 518 warnx("%s", name); 519 (void)Fclose(of); 520 return (-1); 521 } 522 } 523 (void)Fclose(of); 524 printf("%d/%ld\n", lc, cc); 525 (void)fflush(stdout); 526 return (0); 527 } 528 529 /* 530 * Edit the message being collected on fp. 531 * On return, make the edit file the new temp file. 532 */ 533 void 534 mesedit(FILE *fp, int c) 535 { 536 sig_t sigint = signal(SIGINT, SIG_IGN); 537 FILE *nf = run_editor(fp, (off_t)-1, c, 0); 538 539 if (nf != NULL) { 540 (void)fseeko(nf, (off_t)0, SEEK_END); 541 collf = nf; 542 (void)Fclose(fp); 543 } 544 (void)signal(SIGINT, sigint); 545 } 546 547 /* 548 * Pipe the message through the command. 549 * Old message is on stdin of command; 550 * New message collected from stdout. 551 * Sh -c must return 0 to accept the new message. 552 */ 553 void 554 mespipe(FILE *fp, char cmd[]) 555 { 556 FILE *nf; 557 int fd; 558 sig_t sigint = signal(SIGINT, SIG_IGN); 559 char *sh, tempname[PATHSIZE]; 560 561 (void)snprintf(tempname, sizeof(tempname), 562 "%s/mail.ReXXXXXXXXXX", tmpdir); 563 if ((fd = mkstemp(tempname)) == -1 || 564 (nf = Fdopen(fd, "w+")) == NULL) { 565 warn("%s", tempname); 566 goto out; 567 } 568 (void)rm(tempname); 569 /* 570 * stdin = current message. 571 * stdout = new message. 572 */ 573 if ((sh = value("SHELL")) == NULL) 574 sh = _PATH_CSHELL; 575 if (run_command(sh, 576 0, fileno(fp), fileno(nf), "-c", cmd, NULL) < 0) { 577 (void)Fclose(nf); 578 goto out; 579 } 580 if (fsize(nf) == 0) { 581 fprintf(stderr, "No bytes from \"%s\" !?\n", cmd); 582 (void)Fclose(nf); 583 goto out; 584 } 585 /* 586 * Take new files. 587 */ 588 (void)fseeko(nf, (off_t)0, SEEK_END); 589 collf = nf; 590 (void)Fclose(fp); 591 out: 592 (void)signal(SIGINT, sigint); 593 } 594 595 /* 596 * Interpolate the named messages into the current 597 * message, preceding each line with a tab. 598 * Return a count of the number of characters now in 599 * the message, or -1 if an error is encountered writing 600 * the message temporary. The flag argument is 'm' if we 601 * should shift over and 'f' if not. 602 */ 603 int 604 forward(char ms[], FILE *fp, char *fn, int f) 605 { 606 int *msgvec; 607 struct ignoretab *ig; 608 char *tabst; 609 610 msgvec = (int *)salloc((msgCount+1) * sizeof(*msgvec)); 611 if (msgvec == NULL) 612 return (0); 613 if (getmsglist(ms, msgvec, 0) < 0) 614 return (0); 615 if (*msgvec == 0) { 616 *msgvec = first(0, MMNORM); 617 if (*msgvec == 0) { 618 printf("No appropriate messages\n"); 619 return (0); 620 } 621 msgvec[1] = 0; 622 } 623 if (f == 'f' || f == 'F') 624 tabst = NULL; 625 else if ((tabst = value("indentprefix")) == NULL) 626 tabst = "\t"; 627 ig = isupper((unsigned char)f) ? NULL : ignore; 628 printf("Interpolating:"); 629 for (; *msgvec != 0; msgvec++) { 630 struct message *mp = message + *msgvec - 1; 631 632 touch(mp); 633 printf(" %d", *msgvec); 634 if (sendmessage(mp, fp, ig, tabst) < 0) { 635 warnx("%s", fn); 636 return (-1); 637 } 638 } 639 printf("\n"); 640 return (0); 641 } 642 643 /* 644 * Print (continue) when continued after ^Z. 645 */ 646 /*ARGSUSED*/ 647 void 648 collstop(int s) 649 { 650 sig_t old_action = signal(s, SIG_DFL); 651 sigset_t nset; 652 653 (void)sigemptyset(&nset); 654 (void)sigaddset(&nset, s); 655 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 656 (void)kill(0, s); 657 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 658 (void)signal(s, old_action); 659 if (colljmp_p) { 660 colljmp_p = 0; 661 hadintr = 0; 662 longjmp(colljmp, 1); 663 } 664 } 665 666 /* 667 * On interrupt, come here to save the partial message in ~/dead.letter. 668 * Then jump out of the collection loop. 669 */ 670 /*ARGSUSED*/ 671 void 672 collint(int s __unused) 673 { 674 /* 675 * the control flow is subtle, because we can be called from ~q. 676 */ 677 if (!hadintr) { 678 if (value("ignore") != NULL) { 679 printf("@"); 680 (void)fflush(stdout); 681 clearerr(stdin); 682 return; 683 } 684 hadintr = 1; 685 longjmp(colljmp, 1); 686 } 687 rewind(collf); 688 if (value("nosave") == NULL) 689 savedeadletter(collf); 690 longjmp(collabort, 1); 691 } 692 693 /*ARGSUSED*/ 694 void 695 collhup(int s __unused) 696 { 697 rewind(collf); 698 savedeadletter(collf); 699 /* 700 * Let's pretend nobody else wants to clean up, 701 * a true statement at this time. 702 */ 703 exit(1); 704 } 705 706 void 707 savedeadletter(FILE *fp) 708 { 709 FILE *dbuf; 710 int c; 711 char *cp; 712 713 if (fsize(fp) == 0) 714 return; 715 cp = getdeadletter(); 716 c = umask(077); 717 dbuf = Fopen(cp, "a"); 718 (void)umask(c); 719 if (dbuf == NULL) 720 return; 721 while ((c = getc(fp)) != EOF) 722 (void)putc(c, dbuf); 723 (void)Fclose(dbuf); 724 rewind(fp); 725 } 726