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 #include "rcv.h" 33 #include <errno.h> 34 #include <fcntl.h> 35 #include "extern.h" 36 37 /* 38 * Mail -- a mail program 39 * 40 * Lexical processing of commands. 41 */ 42 43 static const char *prompt = "& "; 44 45 extern const struct cmd cmdtab[]; 46 extern const char *version; 47 48 /* 49 * Set up editing on the given file name. 50 * If the first character of name is %, we are considered to be 51 * editing the file, otherwise we are reading our mail which has 52 * signficance for mbox and so forth. 53 * 54 * If the -e option is being passed to mail, this function has a 55 * tri-state return code: -1 on error, 0 on no mail, 1 if there is 56 * mail. 57 */ 58 int 59 setfile(char *name) 60 { 61 FILE *ibuf; 62 int checkmode, i, fd; 63 struct stat stb; 64 char isedit = *name != '%' || getuserid(myname) != getuid(); 65 char *who = name[1] ? name + 1 : myname; 66 char tempname[PATHSIZE]; 67 static int shudclob; 68 69 checkmode = value("checkmode") != NULL; 70 if ((name = expand(name)) == NULL) 71 return (-1); 72 73 if ((ibuf = Fopen(name, "r")) == NULL) { 74 if (!isedit && errno == ENOENT) 75 goto nomail; 76 warn("%s", name); 77 return (-1); 78 } 79 80 if (fstat(fileno(ibuf), &stb) < 0) { 81 warn("fstat"); 82 (void)Fclose(ibuf); 83 return (-1); 84 } 85 86 if (S_ISDIR(stb.st_mode) || !S_ISREG(stb.st_mode)) { 87 (void)Fclose(ibuf); 88 errno = S_ISDIR(stb.st_mode) ? EISDIR : EINVAL; 89 warn("%s", name); 90 return (-1); 91 } 92 93 /* 94 * Looks like all will be well. We must now relinquish our 95 * hold on the current set of stuff. Must hold signals 96 * while we are reading the new file, else we will ruin 97 * the message[] data structure. 98 */ 99 100 holdsigs(); 101 if (shudclob) 102 quit(); 103 104 /* 105 * Copy the messages into /tmp 106 * and set pointers. 107 */ 108 109 readonly = 0; 110 if ((i = open(name, 1)) < 0) 111 readonly++; 112 else 113 (void)close(i); 114 if (shudclob) { 115 (void)fclose(itf); 116 (void)fclose(otf); 117 } 118 shudclob = 1; 119 edit = isedit; 120 strlcpy(prevfile, mailname, sizeof(prevfile)); 121 if (name != mailname) 122 strlcpy(mailname, name, sizeof(mailname)); 123 mailsize = fsize(ibuf); 124 (void)snprintf(tempname, sizeof(tempname), 125 "%s/mail.RxXXXXXXXXXX", tmpdir); 126 if ((fd = mkstemp(tempname)) == -1 || (otf = fdopen(fd, "w")) == NULL) 127 err(1, "%s", tempname); 128 (void)fcntl(fileno(otf), F_SETFD, 1); 129 if ((itf = fopen(tempname, "r")) == NULL) 130 err(1, "%s", tempname); 131 (void)fcntl(fileno(itf), F_SETFD, 1); 132 (void)rm(tempname); 133 setptr(ibuf, 0); 134 setmsize(msgCount); 135 /* 136 * New mail may have arrived while we were reading 137 * the mail file, so reset mailsize to be where 138 * we really are in the file... 139 */ 140 mailsize = ftello(ibuf); 141 (void)Fclose(ibuf); 142 relsesigs(); 143 sawcom = 0; 144 145 if ((checkmode || !edit) && msgCount == 0) { 146 nomail: 147 if (!checkmode) { 148 fprintf(stderr, "No mail for %s\n", who); 149 return (-1); 150 } else 151 return (0); 152 } 153 return (checkmode ? 1 : 0); 154 } 155 156 /* 157 * Incorporate any new mail that has arrived since we first 158 * started reading mail. 159 */ 160 int 161 incfile(void) 162 { 163 off_t newsize; 164 int omsgCount = msgCount; 165 FILE *ibuf; 166 167 ibuf = Fopen(mailname, "r"); 168 if (ibuf == NULL) 169 return (-1); 170 holdsigs(); 171 newsize = fsize(ibuf); 172 if (newsize == 0) 173 return (-1); /* mail box is now empty??? */ 174 if (newsize < mailsize) 175 return (-1); /* mail box has shrunk??? */ 176 if (newsize == mailsize) 177 return (0); /* no new mail */ 178 setptr(ibuf, mailsize); 179 setmsize(msgCount); 180 mailsize = ftello(ibuf); 181 (void)Fclose(ibuf); 182 relsesigs(); 183 return (msgCount - omsgCount); 184 } 185 186 static int *msgvec; 187 static int reset_on_stop; /* do a reset() if stopped */ 188 189 /* 190 * Interpret user commands one by one. If standard input is not a tty, 191 * print no prompt. 192 */ 193 void 194 commands(void) 195 { 196 int n, eofloop = 0; 197 char linebuf[LINESIZE]; 198 199 if (!sourcing) { 200 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 201 (void)signal(SIGINT, intr); 202 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 203 (void)signal(SIGHUP, hangup); 204 (void)signal(SIGTSTP, stop); 205 (void)signal(SIGTTOU, stop); 206 (void)signal(SIGTTIN, stop); 207 } 208 setexit(); 209 for (;;) { 210 /* 211 * Print the prompt, if needed. Clear out 212 * string space, and flush the output. 213 */ 214 if (!sourcing && value("interactive") != NULL) { 215 if ((value("autoinc") != NULL) && (incfile() > 0)) 216 printf("New mail has arrived.\n"); 217 reset_on_stop = 1; 218 printf("%s", prompt); 219 } 220 (void)fflush(stdout); 221 sreset(); 222 /* 223 * Read a line of commands from the current input 224 * and handle end of file specially. 225 */ 226 n = 0; 227 for (;;) { 228 if (readline(input, &linebuf[n], LINESIZE - n) < 0) { 229 if (n == 0) 230 n = -1; 231 break; 232 } 233 if ((n = strlen(linebuf)) == 0) 234 break; 235 n--; 236 if (linebuf[n] != '\\') 237 break; 238 linebuf[n++] = ' '; 239 } 240 reset_on_stop = 0; 241 if (n < 0) { 242 /* eof */ 243 if (loading) 244 break; 245 if (sourcing) { 246 unstack(); 247 continue; 248 } 249 if (value("interactive") != NULL && 250 value("ignoreeof") != NULL && 251 ++eofloop < 25) { 252 printf("Use \"quit\" to quit.\n"); 253 continue; 254 } 255 break; 256 } 257 eofloop = 0; 258 if (execute(linebuf, 0)) 259 break; 260 } 261 } 262 263 /* 264 * Execute a single command. 265 * Command functions return 0 for success, 1 for error, and -1 266 * for abort. A 1 or -1 aborts a load or source. A -1 aborts 267 * the interactive command loop. 268 * Contxt is non-zero if called while composing mail. 269 */ 270 int 271 execute(char linebuf[], int contxt) 272 { 273 char word[LINESIZE]; 274 char *arglist[MAXARGC]; 275 const struct cmd *com; 276 char *cp, *cp2; 277 int c, muvec[2]; 278 int e = 1; 279 280 /* 281 * Strip the white space away from the beginning 282 * of the command, then scan out a word, which 283 * consists of anything except digits and white space. 284 * 285 * Handle ! escapes differently to get the correct 286 * lexical conventions. 287 */ 288 289 for (cp = linebuf; isspace((unsigned char)*cp); cp++) 290 ; 291 if (*cp == '!') { 292 if (sourcing) { 293 printf("Can't \"!\" while sourcing\n"); 294 goto out; 295 } 296 shell(cp+1); 297 return (0); 298 } 299 cp2 = word; 300 while (*cp != '\0' && strchr(" \t0123456789$^.:/-+*'\"", *cp) == NULL) 301 *cp2++ = *cp++; 302 *cp2 = '\0'; 303 304 /* 305 * Look up the command; if not found, bitch. 306 * Normally, a blank command would map to the 307 * first command in the table; while sourcing, 308 * however, we ignore blank lines to eliminate 309 * confusion. 310 */ 311 312 if (sourcing && *word == '\0') 313 return (0); 314 com = lex(word); 315 if (com == NULL) { 316 printf("Unknown command: \"%s\"\n", word); 317 goto out; 318 } 319 320 /* 321 * See if we should execute the command -- if a conditional 322 * we always execute it, otherwise, check the state of cond. 323 */ 324 325 if ((com->c_argtype & F) == 0) 326 if ((cond == CRCV && !rcvmode) || (cond == CSEND && rcvmode)) 327 return (0); 328 329 /* 330 * Process the arguments to the command, depending 331 * on the type he expects. Default to an error. 332 * If we are sourcing an interactive command, it's 333 * an error. 334 */ 335 336 if (!rcvmode && (com->c_argtype & M) == 0) { 337 printf("May not execute \"%s\" while sending\n", 338 com->c_name); 339 goto out; 340 } 341 if (sourcing && com->c_argtype & I) { 342 printf("May not execute \"%s\" while sourcing\n", 343 com->c_name); 344 goto out; 345 } 346 if (readonly && com->c_argtype & W) { 347 printf("May not execute \"%s\" -- message file is read only\n", 348 com->c_name); 349 goto out; 350 } 351 if (contxt && com->c_argtype & R) { 352 printf("Cannot recursively invoke \"%s\"\n", com->c_name); 353 goto out; 354 } 355 switch (com->c_argtype & ~(F|P|I|M|T|W|R)) { 356 case MSGLIST: 357 /* 358 * A message list defaulting to nearest forward 359 * legal message. 360 */ 361 if (msgvec == 0) { 362 printf("Illegal use of \"message list\"\n"); 363 break; 364 } 365 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) 366 break; 367 if (c == 0) { 368 *msgvec = first(com->c_msgflag, com->c_msgmask); 369 msgvec[1] = 0; 370 } 371 if (*msgvec == 0) { 372 printf("No applicable messages\n"); 373 break; 374 } 375 e = (*com->c_func)(msgvec); 376 break; 377 378 case NDMLIST: 379 /* 380 * A message list with no defaults, but no error 381 * if none exist. 382 */ 383 if (msgvec == 0) { 384 printf("Illegal use of \"message list\"\n"); 385 break; 386 } 387 if (getmsglist(cp, msgvec, com->c_msgflag) < 0) 388 break; 389 e = (*com->c_func)(msgvec); 390 break; 391 392 case STRLIST: 393 /* 394 * Just the straight string, with 395 * leading blanks removed. 396 */ 397 while (isspace((unsigned char)*cp)) 398 cp++; 399 e = (*com->c_func)(cp); 400 break; 401 402 case RAWLIST: 403 /* 404 * A vector of strings, in shell style. 405 */ 406 if ((c = getrawlist(cp, arglist, 407 sizeof(arglist) / sizeof(*arglist))) < 0) 408 break; 409 if (c < com->c_minargs) { 410 printf("%s requires at least %d arg(s)\n", 411 com->c_name, com->c_minargs); 412 break; 413 } 414 if (c > com->c_maxargs) { 415 printf("%s takes no more than %d arg(s)\n", 416 com->c_name, com->c_maxargs); 417 break; 418 } 419 e = (*com->c_func)(arglist); 420 break; 421 422 case NOLIST: 423 /* 424 * Just the constant zero, for exiting, 425 * eg. 426 */ 427 e = (*com->c_func)(0); 428 break; 429 430 default: 431 errx(1, "Unknown argtype"); 432 } 433 434 out: 435 /* 436 * Exit the current source file on 437 * error. 438 */ 439 if (e) { 440 if (e < 0) 441 return (1); 442 if (loading) 443 return (1); 444 if (sourcing) 445 unstack(); 446 return (0); 447 } 448 if (com == NULL) 449 return (0); 450 if (value("autoprint") != NULL && com->c_argtype & P) 451 if ((dot->m_flag & MDELETED) == 0) { 452 muvec[0] = dot - &message[0] + 1; 453 muvec[1] = 0; 454 type(muvec); 455 } 456 if (!sourcing && (com->c_argtype & T) == 0) 457 sawcom = 1; 458 return (0); 459 } 460 461 /* 462 * Set the size of the message vector used to construct argument 463 * lists to message list functions. 464 */ 465 void 466 setmsize(int sz) 467 { 468 469 if (msgvec != NULL) 470 (void)free(msgvec); 471 msgvec = calloc((unsigned)(sz + 1), sizeof(*msgvec)); 472 } 473 474 /* 475 * Find the correct command in the command table corresponding 476 * to the passed command "word" 477 */ 478 479 const struct cmd * 480 lex(char word[]) 481 { 482 const struct cmd *cp; 483 484 /* 485 * ignore trailing chars after `#' 486 * 487 * lines with beginning `#' are comments 488 * spaces before `#' are ignored in execute() 489 */ 490 491 if (*word == '#') 492 *(word+1) = '\0'; 493 494 495 for (cp = &cmdtab[0]; cp->c_name != NULL; cp++) 496 if (isprefix(word, cp->c_name)) 497 return (cp); 498 return (NULL); 499 } 500 501 /* 502 * Determine if as1 is a valid prefix of as2. 503 * Return true if yep. 504 */ 505 int 506 isprefix(const char *as1, const char *as2) 507 { 508 const char *s1, *s2; 509 510 s1 = as1; 511 s2 = as2; 512 while (*s1++ == *s2) 513 if (*s2++ == '\0') 514 return (1); 515 return (*--s1 == '\0'); 516 } 517 518 /* 519 * The following gets called on receipt of an interrupt. This is 520 * to abort printout of a command, mainly. 521 * Dispatching here when command() is inactive crashes rcv. 522 * Close all open files except 0, 1, 2, and the temporary. 523 * Also, unstack all source files. 524 */ 525 526 static int inithdr; /* am printing startup headers */ 527 528 void 529 intr(int s __unused) 530 { 531 532 noreset = 0; 533 if (!inithdr) 534 sawcom++; 535 inithdr = 0; 536 while (sourcing) 537 unstack(); 538 539 close_all_files(); 540 541 if (image >= 0) { 542 (void)close(image); 543 image = -1; 544 } 545 fprintf(stderr, "Interrupt\n"); 546 reset(0); 547 } 548 549 /* 550 * When we wake up after ^Z, reprint the prompt. 551 */ 552 void 553 stop(int s) 554 { 555 sig_t old_action = signal(s, SIG_DFL); 556 sigset_t nset; 557 558 (void)sigemptyset(&nset); 559 (void)sigaddset(&nset, s); 560 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 561 (void)kill(0, s); 562 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 563 (void)signal(s, old_action); 564 if (reset_on_stop) { 565 reset_on_stop = 0; 566 reset(0); 567 } 568 } 569 570 /* 571 * Branch here on hangup signal and simulate "exit". 572 */ 573 void 574 hangup(int s __unused) 575 { 576 577 /* nothing to do? */ 578 exit(1); 579 } 580 581 /* 582 * Announce the presence of the current Mail version, 583 * give the message count, and print a header listing. 584 */ 585 void 586 announce(void) 587 { 588 int vec[2], mdot; 589 590 mdot = newfileinfo(0); 591 vec[0] = mdot; 592 vec[1] = 0; 593 dot = &message[mdot - 1]; 594 if (msgCount > 0 && value("noheader") == NULL) { 595 inithdr++; 596 headers(vec); 597 inithdr = 0; 598 } 599 } 600 601 /* 602 * Announce information about the file we are editing. 603 * Return a likely place to set dot. 604 */ 605 int 606 newfileinfo(int omsgCount) 607 { 608 struct message *mp; 609 int u, n, mdot, d, s; 610 char fname[PATHSIZE+1], zname[PATHSIZE+1], *ename; 611 612 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++) 613 if (mp->m_flag & MNEW) 614 break; 615 if (mp >= &message[msgCount]) 616 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++) 617 if ((mp->m_flag & MREAD) == 0) 618 break; 619 if (mp < &message[msgCount]) 620 mdot = mp - &message[0] + 1; 621 else 622 mdot = omsgCount + 1; 623 s = d = 0; 624 for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) { 625 if (mp->m_flag & MNEW) 626 n++; 627 if ((mp->m_flag & MREAD) == 0) 628 u++; 629 if (mp->m_flag & MDELETED) 630 d++; 631 if (mp->m_flag & MSAVED) 632 s++; 633 } 634 ename = mailname; 635 if (getfold(fname, sizeof(fname) - 1) >= 0) { 636 strcat(fname, "/"); 637 if (strncmp(fname, mailname, strlen(fname)) == 0) { 638 (void)snprintf(zname, sizeof(zname), "+%s", 639 mailname + strlen(fname)); 640 ename = zname; 641 } 642 } 643 printf("\"%s\": ", ename); 644 if (msgCount == 1) 645 printf("1 message"); 646 else 647 printf("%d messages", msgCount); 648 if (n > 0) 649 printf(" %d new", n); 650 if (u-n > 0) 651 printf(" %d unread", u); 652 if (d > 0) 653 printf(" %d deleted", d); 654 if (s > 0) 655 printf(" %d saved", s); 656 if (readonly) 657 printf(" [Read only]"); 658 printf("\n"); 659 return (mdot); 660 } 661 662 /* 663 * Print the current version number. 664 */ 665 666 int 667 pversion(void *arg __unused) 668 { 669 670 printf("Version %s\n", version); 671 return (0); 672 } 673 674 /* 675 * Load a file of user definitions. 676 */ 677 void 678 load(char *name) 679 { 680 FILE *in, *oldin; 681 682 if ((in = Fopen(name, "r")) == NULL) 683 return; 684 oldin = input; 685 input = in; 686 loading = 1; 687 sourcing = 1; 688 commands(); 689 loading = 0; 690 sourcing = 0; 691 input = oldin; 692 (void)Fclose(in); 693 } 694