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