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 #ifndef lint 33 #if 0 34 static char sccsid[] = "@(#)lex.c 8.2 (Berkeley) 4/20/95"; 35 #endif 36 #endif /* not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include "rcv.h" 41 #include <errno.h> 42 #include <fcntl.h> 43 #include "extern.h" 44 45 /* 46 * Mail -- a mail program 47 * 48 * Lexical processing of commands. 49 */ 50 51 static const char *prompt = "& "; 52 53 extern const struct cmd cmdtab[]; 54 extern const char *version; 55 56 /* 57 * Set up editing on the given file name. 58 * If the first character of name is %, we are considered to be 59 * editing the file, otherwise we are reading our mail which has 60 * signficance for mbox and so forth. 61 * 62 * If the -e option is being passed to mail, this function has a 63 * tri-state return code: -1 on error, 0 on no mail, 1 if there is 64 * mail. 65 */ 66 int 67 setfile(char *name) 68 { 69 FILE *ibuf; 70 int checkmode, i, fd; 71 struct stat stb; 72 char isedit = *name != '%' || getuserid(myname) != getuid(); 73 char *who = name[1] ? name + 1 : myname; 74 char tempname[PATHSIZE]; 75 static int shudclob; 76 77 checkmode = value("checkmode") != NULL; 78 if ((name = expand(name)) == NULL) 79 return (-1); 80 81 if ((ibuf = Fopen(name, "r")) == NULL) { 82 if (!isedit && errno == ENOENT) 83 goto nomail; 84 warn("%s", name); 85 return (-1); 86 } 87 88 if (fstat(fileno(ibuf), &stb) < 0) { 89 warn("fstat"); 90 (void)Fclose(ibuf); 91 return (-1); 92 } 93 94 if (S_ISDIR(stb.st_mode) || !S_ISREG(stb.st_mode)) { 95 (void)Fclose(ibuf); 96 errno = S_ISDIR(stb.st_mode) ? EISDIR : EINVAL; 97 warn("%s", name); 98 return (-1); 99 } 100 101 /* 102 * Looks like all will be well. We must now relinquish our 103 * hold on the current set of stuff. Must hold signals 104 * while we are reading the new file, else we will ruin 105 * the message[] data structure. 106 */ 107 108 holdsigs(); 109 if (shudclob) 110 quit(); 111 112 /* 113 * Copy the messages into /tmp 114 * and set pointers. 115 */ 116 117 readonly = 0; 118 if ((i = open(name, 1)) < 0) 119 readonly++; 120 else 121 (void)close(i); 122 if (shudclob) { 123 (void)fclose(itf); 124 (void)fclose(otf); 125 } 126 shudclob = 1; 127 edit = isedit; 128 strlcpy(prevfile, mailname, sizeof(prevfile)); 129 if (name != mailname) 130 strlcpy(mailname, name, sizeof(mailname)); 131 mailsize = fsize(ibuf); 132 (void)snprintf(tempname, sizeof(tempname), 133 "%s/mail.RxXXXXXXXXXX", tmpdir); 134 if ((fd = mkstemp(tempname)) == -1 || (otf = fdopen(fd, "w")) == NULL) 135 err(1, "%s", tempname); 136 (void)fcntl(fileno(otf), F_SETFD, 1); 137 if ((itf = fopen(tempname, "r")) == NULL) 138 err(1, "%s", tempname); 139 (void)fcntl(fileno(itf), F_SETFD, 1); 140 (void)rm(tempname); 141 setptr(ibuf, 0); 142 setmsize(msgCount); 143 /* 144 * New mail may have arrived while we were reading 145 * the mail file, so reset mailsize to be where 146 * we really are in the file... 147 */ 148 mailsize = ftello(ibuf); 149 (void)Fclose(ibuf); 150 relsesigs(); 151 sawcom = 0; 152 153 if ((checkmode || !edit) && msgCount == 0) { 154 nomail: 155 if (!checkmode) { 156 fprintf(stderr, "No mail for %s\n", who); 157 return (-1); 158 } else 159 return (0); 160 } 161 return (checkmode ? 1 : 0); 162 } 163 164 /* 165 * Incorporate any new mail that has arrived since we first 166 * started reading mail. 167 */ 168 int 169 incfile(void) 170 { 171 off_t newsize; 172 int omsgCount = msgCount; 173 FILE *ibuf; 174 175 ibuf = Fopen(mailname, "r"); 176 if (ibuf == NULL) 177 return (-1); 178 holdsigs(); 179 newsize = fsize(ibuf); 180 if (newsize == 0) 181 return (-1); /* mail box is now empty??? */ 182 if (newsize < mailsize) 183 return (-1); /* mail box has shrunk??? */ 184 if (newsize == mailsize) 185 return (0); /* no new mail */ 186 setptr(ibuf, mailsize); 187 setmsize(msgCount); 188 mailsize = ftello(ibuf); 189 (void)Fclose(ibuf); 190 relsesigs(); 191 return (msgCount - omsgCount); 192 } 193 194 static int *msgvec; 195 static int reset_on_stop; /* do a reset() if stopped */ 196 197 /* 198 * Interpret user commands one by one. If standard input is not a tty, 199 * print no prompt. 200 */ 201 void 202 commands(void) 203 { 204 int n, eofloop = 0; 205 char linebuf[LINESIZE]; 206 207 if (!sourcing) { 208 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 209 (void)signal(SIGINT, intr); 210 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 211 (void)signal(SIGHUP, hangup); 212 (void)signal(SIGTSTP, stop); 213 (void)signal(SIGTTOU, stop); 214 (void)signal(SIGTTIN, stop); 215 } 216 setexit(); 217 for (;;) { 218 /* 219 * Print the prompt, if needed. Clear out 220 * string space, and flush the output. 221 */ 222 if (!sourcing && value("interactive") != NULL) { 223 if ((value("autoinc") != NULL) && (incfile() > 0)) 224 printf("New mail has arrived.\n"); 225 reset_on_stop = 1; 226 printf("%s", prompt); 227 } 228 (void)fflush(stdout); 229 sreset(); 230 /* 231 * Read a line of commands from the current input 232 * and handle end of file specially. 233 */ 234 n = 0; 235 for (;;) { 236 if (readline(input, &linebuf[n], LINESIZE - n) < 0) { 237 if (n == 0) 238 n = -1; 239 break; 240 } 241 if ((n = strlen(linebuf)) == 0) 242 break; 243 n--; 244 if (linebuf[n] != '\\') 245 break; 246 linebuf[n++] = ' '; 247 } 248 reset_on_stop = 0; 249 if (n < 0) { 250 /* eof */ 251 if (loading) 252 break; 253 if (sourcing) { 254 unstack(); 255 continue; 256 } 257 if (value("interactive") != NULL && 258 value("ignoreeof") != NULL && 259 ++eofloop < 25) { 260 printf("Use \"quit\" to quit.\n"); 261 continue; 262 } 263 break; 264 } 265 eofloop = 0; 266 if (execute(linebuf, 0)) 267 break; 268 } 269 } 270 271 /* 272 * Execute a single command. 273 * Command functions return 0 for success, 1 for error, and -1 274 * for abort. A 1 or -1 aborts a load or source. A -1 aborts 275 * the interactive command loop. 276 * Contxt is non-zero if called while composing mail. 277 */ 278 int 279 execute(char linebuf[], int contxt) 280 { 281 char word[LINESIZE]; 282 char *arglist[MAXARGC]; 283 const struct cmd *com; 284 char *cp, *cp2; 285 int c, muvec[2]; 286 int e = 1; 287 288 /* 289 * Strip the white space away from the beginning 290 * of the command, then scan out a word, which 291 * consists of anything except digits and white space. 292 * 293 * Handle ! escapes differently to get the correct 294 * lexical conventions. 295 */ 296 297 for (cp = linebuf; isspace((unsigned char)*cp); cp++) 298 ; 299 if (*cp == '!') { 300 if (sourcing) { 301 printf("Can't \"!\" while sourcing\n"); 302 goto out; 303 } 304 shell(cp+1); 305 return (0); 306 } 307 cp2 = word; 308 while (*cp != '\0' && strchr(" \t0123456789$^.:/-+*'\"", *cp) == NULL) 309 *cp2++ = *cp++; 310 *cp2 = '\0'; 311 312 /* 313 * Look up the command; if not found, bitch. 314 * Normally, a blank command would map to the 315 * first command in the table; while sourcing, 316 * however, we ignore blank lines to eliminate 317 * confusion. 318 */ 319 320 if (sourcing && *word == '\0') 321 return (0); 322 com = lex(word); 323 if (com == NULL) { 324 printf("Unknown command: \"%s\"\n", word); 325 goto out; 326 } 327 328 /* 329 * See if we should execute the command -- if a conditional 330 * we always execute it, otherwise, check the state of cond. 331 */ 332 333 if ((com->c_argtype & F) == 0) 334 if ((cond == CRCV && !rcvmode) || (cond == CSEND && rcvmode)) 335 return (0); 336 337 /* 338 * Process the arguments to the command, depending 339 * on the type he expects. Default to an error. 340 * If we are sourcing an interactive command, it's 341 * an error. 342 */ 343 344 if (!rcvmode && (com->c_argtype & M) == 0) { 345 printf("May not execute \"%s\" while sending\n", 346 com->c_name); 347 goto out; 348 } 349 if (sourcing && com->c_argtype & I) { 350 printf("May not execute \"%s\" while sourcing\n", 351 com->c_name); 352 goto out; 353 } 354 if (readonly && com->c_argtype & W) { 355 printf("May not execute \"%s\" -- message file is read only\n", 356 com->c_name); 357 goto out; 358 } 359 if (contxt && com->c_argtype & R) { 360 printf("Cannot recursively invoke \"%s\"\n", com->c_name); 361 goto out; 362 } 363 switch (com->c_argtype & ~(F|P|I|M|T|W|R)) { 364 case MSGLIST: 365 /* 366 * A message list defaulting to nearest forward 367 * legal message. 368 */ 369 if (msgvec == 0) { 370 printf("Illegal use of \"message list\"\n"); 371 break; 372 } 373 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) 374 break; 375 if (c == 0) { 376 *msgvec = first(com->c_msgflag, com->c_msgmask); 377 msgvec[1] = 0; 378 } 379 if (*msgvec == 0) { 380 printf("No applicable messages\n"); 381 break; 382 } 383 e = (*com->c_func)(msgvec); 384 break; 385 386 case NDMLIST: 387 /* 388 * A message list with no defaults, but no error 389 * if none exist. 390 */ 391 if (msgvec == 0) { 392 printf("Illegal use of \"message list\"\n"); 393 break; 394 } 395 if (getmsglist(cp, msgvec, com->c_msgflag) < 0) 396 break; 397 e = (*com->c_func)(msgvec); 398 break; 399 400 case STRLIST: 401 /* 402 * Just the straight string, with 403 * leading blanks removed. 404 */ 405 while (isspace((unsigned char)*cp)) 406 cp++; 407 e = (*com->c_func)(cp); 408 break; 409 410 case RAWLIST: 411 /* 412 * A vector of strings, in shell style. 413 */ 414 if ((c = getrawlist(cp, arglist, 415 sizeof(arglist) / sizeof(*arglist))) < 0) 416 break; 417 if (c < com->c_minargs) { 418 printf("%s requires at least %d arg(s)\n", 419 com->c_name, com->c_minargs); 420 break; 421 } 422 if (c > com->c_maxargs) { 423 printf("%s takes no more than %d arg(s)\n", 424 com->c_name, com->c_maxargs); 425 break; 426 } 427 e = (*com->c_func)(arglist); 428 break; 429 430 case NOLIST: 431 /* 432 * Just the constant zero, for exiting, 433 * eg. 434 */ 435 e = (*com->c_func)(0); 436 break; 437 438 default: 439 errx(1, "Unknown argtype"); 440 } 441 442 out: 443 /* 444 * Exit the current source file on 445 * error. 446 */ 447 if (e) { 448 if (e < 0) 449 return (1); 450 if (loading) 451 return (1); 452 if (sourcing) 453 unstack(); 454 return (0); 455 } 456 if (com == NULL) 457 return (0); 458 if (value("autoprint") != NULL && com->c_argtype & P) 459 if ((dot->m_flag & MDELETED) == 0) { 460 muvec[0] = dot - &message[0] + 1; 461 muvec[1] = 0; 462 type(muvec); 463 } 464 if (!sourcing && (com->c_argtype & T) == 0) 465 sawcom = 1; 466 return (0); 467 } 468 469 /* 470 * Set the size of the message vector used to construct argument 471 * lists to message list functions. 472 */ 473 void 474 setmsize(int sz) 475 { 476 477 if (msgvec != NULL) 478 (void)free(msgvec); 479 msgvec = calloc((unsigned)(sz + 1), sizeof(*msgvec)); 480 } 481 482 /* 483 * Find the correct command in the command table corresponding 484 * to the passed command "word" 485 */ 486 487 const struct cmd * 488 lex(char word[]) 489 { 490 const struct cmd *cp; 491 492 /* 493 * ignore trailing chars after `#' 494 * 495 * lines with beginning `#' are comments 496 * spaces before `#' are ignored in execute() 497 */ 498 499 if (*word == '#') 500 *(word+1) = '\0'; 501 502 503 for (cp = &cmdtab[0]; cp->c_name != NULL; cp++) 504 if (isprefix(word, cp->c_name)) 505 return (cp); 506 return (NULL); 507 } 508 509 /* 510 * Determine if as1 is a valid prefix of as2. 511 * Return true if yep. 512 */ 513 int 514 isprefix(const char *as1, const char *as2) 515 { 516 const char *s1, *s2; 517 518 s1 = as1; 519 s2 = as2; 520 while (*s1++ == *s2) 521 if (*s2++ == '\0') 522 return (1); 523 return (*--s1 == '\0'); 524 } 525 526 /* 527 * The following gets called on receipt of an interrupt. This is 528 * to abort printout of a command, mainly. 529 * Dispatching here when command() is inactive crashes rcv. 530 * Close all open files except 0, 1, 2, and the temporary. 531 * Also, unstack all source files. 532 */ 533 534 static int inithdr; /* am printing startup headers */ 535 536 void 537 intr(int s __unused) 538 { 539 540 noreset = 0; 541 if (!inithdr) 542 sawcom++; 543 inithdr = 0; 544 while (sourcing) 545 unstack(); 546 547 close_all_files(); 548 549 if (image >= 0) { 550 (void)close(image); 551 image = -1; 552 } 553 fprintf(stderr, "Interrupt\n"); 554 reset(0); 555 } 556 557 /* 558 * When we wake up after ^Z, reprint the prompt. 559 */ 560 void 561 stop(int s) 562 { 563 sig_t old_action = signal(s, SIG_DFL); 564 sigset_t nset; 565 566 (void)sigemptyset(&nset); 567 (void)sigaddset(&nset, s); 568 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 569 (void)kill(0, s); 570 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 571 (void)signal(s, old_action); 572 if (reset_on_stop) { 573 reset_on_stop = 0; 574 reset(0); 575 } 576 } 577 578 /* 579 * Branch here on hangup signal and simulate "exit". 580 */ 581 void 582 hangup(int s __unused) 583 { 584 585 /* nothing to do? */ 586 exit(1); 587 } 588 589 /* 590 * Announce the presence of the current Mail version, 591 * give the message count, and print a header listing. 592 */ 593 void 594 announce(void) 595 { 596 int vec[2], mdot; 597 598 mdot = newfileinfo(0); 599 vec[0] = mdot; 600 vec[1] = 0; 601 dot = &message[mdot - 1]; 602 if (msgCount > 0 && value("noheader") == NULL) { 603 inithdr++; 604 headers(vec); 605 inithdr = 0; 606 } 607 } 608 609 /* 610 * Announce information about the file we are editing. 611 * Return a likely place to set dot. 612 */ 613 int 614 newfileinfo(int omsgCount) 615 { 616 struct message *mp; 617 int u, n, mdot, d, s; 618 char fname[PATHSIZE+1], zname[PATHSIZE+1], *ename; 619 620 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++) 621 if (mp->m_flag & MNEW) 622 break; 623 if (mp >= &message[msgCount]) 624 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++) 625 if ((mp->m_flag & MREAD) == 0) 626 break; 627 if (mp < &message[msgCount]) 628 mdot = mp - &message[0] + 1; 629 else 630 mdot = omsgCount + 1; 631 s = d = 0; 632 for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) { 633 if (mp->m_flag & MNEW) 634 n++; 635 if ((mp->m_flag & MREAD) == 0) 636 u++; 637 if (mp->m_flag & MDELETED) 638 d++; 639 if (mp->m_flag & MSAVED) 640 s++; 641 } 642 ename = mailname; 643 if (getfold(fname, sizeof(fname) - 1) >= 0) { 644 strcat(fname, "/"); 645 if (strncmp(fname, mailname, strlen(fname)) == 0) { 646 (void)snprintf(zname, sizeof(zname), "+%s", 647 mailname + strlen(fname)); 648 ename = zname; 649 } 650 } 651 printf("\"%s\": ", ename); 652 if (msgCount == 1) 653 printf("1 message"); 654 else 655 printf("%d messages", msgCount); 656 if (n > 0) 657 printf(" %d new", n); 658 if (u-n > 0) 659 printf(" %d unread", u); 660 if (d > 0) 661 printf(" %d deleted", d); 662 if (s > 0) 663 printf(" %d saved", s); 664 if (readonly) 665 printf(" [Read only]"); 666 printf("\n"); 667 return (mdot); 668 } 669 670 /* 671 * Print the current version number. 672 */ 673 674 int 675 pversion(int e __unused) 676 { 677 678 printf("Version %s\n", version); 679 return (0); 680 } 681 682 /* 683 * Load a file of user definitions. 684 */ 685 void 686 load(char *name) 687 { 688 FILE *in, *oldin; 689 690 if ((in = Fopen(name, "r")) == NULL) 691 return; 692 oldin = input; 693 input = in; 694 loading = 1; 695 sourcing = 1; 696 commands(); 697 loading = 0; 698 sourcing = 0; 699 input = oldin; 700 (void)Fclose(in); 701 } 702