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 * @(#)lex.c 8.2 (Berkeley) 4/20/95 30 * $FreeBSD: src/usr.bin/mail/lex.c,v 1.5.6.5 2003/01/06 05:46:03 mikeh Exp $ 31 */ 32 33 #include "rcv.h" 34 #include <errno.h> 35 #include <fcntl.h> 36 #include "extern.h" 37 38 /* 39 * Mail -- a mail program 40 * 41 * Lexical processing of commands. 42 */ 43 44 const char *prompt = "& "; 45 46 extern const struct cmd cmdtab[]; 47 extern const char *version; 48 49 /* 50 * Set up editing on the given file name. 51 * If the first character of name is %, we are considered to be 52 * editing the file, otherwise we are reading our mail which has 53 * signficance for mbox and so forth. 54 * 55 * If the -e option is passed to mail, this function has a 56 * tri-state return code: -1 on error, 0 on no mail, 1 if there is 57 * mail. 58 */ 59 int 60 setfile(char *name) 61 { 62 FILE *ibuf; 63 int checkmode, i, fd; 64 struct stat stb; 65 char isedit = *name != '%' || getuserid(myname) != getuid(); 66 char *who = name[1] ? name + 1 : myname; 67 char tempname[PATHSIZE]; 68 static int shudclob; 69 70 checkmode = value("checkmode") != NULL; 71 72 if ((name = expand(name)) == NULL) 73 return (-1); 74 75 if ((ibuf = Fopen(name, "r")) == NULL) { 76 if (!isedit && errno == ENOENT) 77 goto nomail; 78 warn("%s", name); 79 return (-1); 80 } 81 82 if (fstat(fileno(ibuf), &stb) < 0) { 83 warn("fstat"); 84 Fclose(ibuf); 85 return (-1); 86 } 87 88 if (S_ISDIR(stb.st_mode) || !S_ISREG(stb.st_mode)) { 89 Fclose(ibuf); 90 errno = S_ISDIR(stb.st_mode) ? EISDIR : EINVAL; 91 warn("%s", name); 92 return (-1); 93 } 94 95 /* 96 * Looks like all will be well. We must now relinquish our 97 * hold on the current set of stuff. Must hold signals 98 * while we are reading the new file, else we will ruin 99 * the message[] data structure. 100 */ 101 102 holdsigs(); 103 if (shudclob) 104 quit(); 105 106 /* 107 * Copy the messages into /tmp 108 * and set pointers. 109 */ 110 111 readonly = 0; 112 if ((i = open(name, 1)) < 0) 113 readonly++; 114 else 115 close(i); 116 if (shudclob) { 117 fclose(itf); 118 fclose(otf); 119 } 120 shudclob = 1; 121 edit = isedit; 122 strlcpy(prevfile, mailname, sizeof(prevfile)); 123 if (name != mailname) 124 strlcpy(mailname, name, sizeof(mailname)); 125 mailsize = fsize(ibuf); 126 snprintf(tempname, sizeof(tempname), "%s/mail.RxXXXXXXXXXX", tmpdir); 127 if ((fd = mkstemp(tempname)) == -1 || (otf = fdopen(fd, "w")) == NULL) 128 err(1, "%s", tempname); 129 fcntl(fileno(otf), F_SETFD, 1); 130 if ((itf = fopen(tempname, "r")) == NULL) 131 err(1, "%s", tempname); 132 fcntl(fileno(itf), F_SETFD, 1); 133 rm(tempname); 134 setptr(ibuf, 0); 135 setmsize(msgCount); 136 /* 137 * New mail may have arrived while we were reading 138 * the mail file, so reset mailsize to be where 139 * we really are in the file... 140 */ 141 mailsize = ftello(ibuf); 142 Fclose(ibuf); 143 relsesigs(); 144 sawcom = 0; 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 } 154 return (checkmode ? 1 : 0); 155 } 156 157 /* 158 * Incorporate any new mail that has arrived since we first 159 * started reading mail. 160 */ 161 int 162 incfile(void) 163 { 164 off_t newsize; 165 int omsgCount = msgCount; 166 FILE *ibuf; 167 168 ibuf = Fopen(mailname, "r"); 169 if (ibuf == NULL) 170 return (-1); 171 holdsigs(); 172 newsize = fsize(ibuf); 173 if (newsize == 0) 174 return (-1); /* mail box is now empty??? */ 175 if (newsize < mailsize) 176 return (-1); /* mail box has shrunk??? */ 177 if (newsize == mailsize) 178 return (0); /* no new mail */ 179 setptr(ibuf, mailsize); 180 setmsize(msgCount); 181 mailsize = ftello(ibuf); 182 Fclose(ibuf); 183 relsesigs(); 184 return (msgCount - omsgCount); 185 } 186 187 int *msgvec; 188 int reset_on_stop; /* do a reset() if stopped */ 189 190 /* 191 * Interpret user commands one by one. If standard input is not a tty, 192 * print no prompt. 193 */ 194 void 195 commands(void) 196 { 197 int n, eofloop = 0; 198 char linebuf[LINESIZE]; 199 200 if (!sourcing) { 201 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 202 signal(SIGINT, intr); 203 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 204 signal(SIGHUP, hangup); 205 signal(SIGTSTP, stop); 206 signal(SIGTTOU, stop); 207 signal(SIGTTIN, stop); 208 } 209 setexit(); 210 for (;;) { 211 /* 212 * Print the prompt, if needed. Clear out 213 * string space, and flush the output. 214 */ 215 if (!sourcing && value("interactive") != NULL) { 216 if ((value("autoinc") != NULL) && (incfile() > 0)) 217 printf("New mail has arrived.\n"); 218 reset_on_stop = 1; 219 printf("%s", prompt); 220 } 221 fflush(stdout); 222 sreset(); 223 /* 224 * Read a line of commands from the current input 225 * and handle end of file specially. 226 */ 227 n = 0; 228 for (;;) { 229 if (readline(input, &linebuf[n], LINESIZE - n) < 0) { 230 if (n == 0) 231 n = -1; 232 break; 233 } 234 if ((n = strlen(linebuf)) == 0) 235 break; 236 n--; 237 if (linebuf[n] != '\\') 238 break; 239 linebuf[n++] = ' '; 240 } 241 reset_on_stop = 0; 242 if (n < 0) { 243 /* eof */ 244 if (loading) 245 break; 246 if (sourcing) { 247 unstack(); 248 continue; 249 } 250 if (value("interactive") != NULL && 251 value("ignoreeof") != NULL && 252 ++eofloop < 25) { 253 printf("Use \"quit\" to quit.\n"); 254 continue; 255 } 256 break; 257 } 258 eofloop = 0; 259 if (execute(linebuf, 0)) 260 break; 261 } 262 } 263 264 /* 265 * Execute a single command. 266 * Command functions return 0 for success, 1 for error, and -1 267 * for abort. A 1 or -1 aborts a load or source. A -1 aborts 268 * the interactive command loop. 269 * Contxt is non-zero if called while composing mail. 270 */ 271 int 272 execute(char *linebuf, int contxt) 273 { 274 char word[LINESIZE]; 275 char *arglist[MAXARGC]; 276 const struct cmd *com; 277 char *cp, *cp2; 278 int c, muvec[2]; 279 int e = 1; 280 281 /* 282 * Strip the white space away from the beginning 283 * of the command, then scan out a word, which 284 * consists of anything except digits and white space. 285 * 286 * Handle ! escapes differently to get the correct 287 * lexical conventions. 288 */ 289 290 for (cp = linebuf; isspace((unsigned char)*cp); cp++) 291 ; 292 if (*cp == '!') { 293 if (sourcing) { 294 printf("Can't \"!\" while sourcing\n"); 295 goto out; 296 } 297 shell(cp+1); 298 return (0); 299 } 300 cp2 = word; 301 while (*cp != '\0' && strchr(" \t0123456789$^.:/-+*'\"", *cp) == NULL) 302 *cp2++ = *cp++; 303 *cp2 = '\0'; 304 305 /* 306 * Look up the command; if not found, bitch. 307 * Normally, a blank command would map to the 308 * first command in the table; while sourcing, 309 * however, we ignore blank lines to eliminate 310 * confusion. 311 */ 312 313 if (sourcing && *word == '\0') 314 return (0); 315 com = lex(word); 316 if (com == NULL) { 317 printf("Unknown command: \"%s\"\n", word); 318 goto out; 319 } 320 321 /* 322 * See if we should execute the command -- if a conditional 323 * we always execute it, otherwise, check the state of cond. 324 */ 325 326 if ((com->c_argtype & F) == 0) 327 if ((cond == CRCV && !rcvmode) || (cond == CSEND && rcvmode)) 328 return (0); 329 330 /* 331 * Process the arguments to the command, depending 332 * on the type he expects. Default to an error. 333 * If we are sourcing an interactive command, it's 334 * an error. 335 */ 336 337 if (!rcvmode && (com->c_argtype & M) == 0) { 338 printf("May not execute \"%s\" while sending\n", 339 com->c_name); 340 goto out; 341 } 342 if (sourcing && com->c_argtype & I) { 343 printf("May not execute \"%s\" while sourcing\n", 344 com->c_name); 345 goto out; 346 } 347 if (readonly && com->c_argtype & W) { 348 printf("May not execute \"%s\" -- message file is read only\n", 349 com->c_name); 350 goto out; 351 } 352 if (contxt && com->c_argtype & R) { 353 printf("Cannot recursively invoke \"%s\"\n", com->c_name); 354 goto out; 355 } 356 switch (com->c_argtype & ~(F|P|I|M|T|W|R)) { 357 case MSGLIST: 358 /* 359 * A message list defaulting to nearest forward 360 * legal message. 361 */ 362 if (msgvec == NULL) { 363 printf("Illegal use of \"message list\"\n"); 364 break; 365 } 366 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) 367 break; 368 if (c == 0) { 369 *msgvec = first(com->c_msgflag, com->c_msgmask); 370 msgvec[1] = 0; 371 } 372 if (*msgvec == 0) { 373 printf("No applicable messages\n"); 374 break; 375 } 376 e = (*com->c_func)(msgvec); 377 break; 378 379 case NDMLIST: 380 /* 381 * A message list with no defaults, but no error 382 * if none exist. 383 */ 384 if (msgvec == NULL) { 385 printf("Illegal use of \"message list\"\n"); 386 break; 387 } 388 if (getmsglist(cp, msgvec, com->c_msgflag) < 0) 389 break; 390 e = (*com->c_func)(msgvec); 391 break; 392 393 case STRLIST: 394 /* 395 * Just the straight string, with 396 * leading blanks removed. 397 */ 398 while (isspace((unsigned char)*cp)) 399 cp++; 400 e = (*com->c_func)(cp); 401 break; 402 403 case RAWLIST: 404 /* 405 * A vector of strings, in shell style. 406 */ 407 if ((c = getrawlist(cp, arglist, 408 sizeof(arglist) / sizeof(*arglist))) < 0) 409 break; 410 if (c < com->c_minargs) { 411 printf("%s requires at least %d arg(s)\n", 412 com->c_name, com->c_minargs); 413 break; 414 } 415 if (c > com->c_maxargs) { 416 printf("%s takes no more than %d arg(s)\n", 417 com->c_name, com->c_maxargs); 418 break; 419 } 420 e = (*com->c_func)(arglist); 421 break; 422 423 case NOLIST: 424 /* 425 * Just the constant zero, for exiting, 426 * eg. 427 */ 428 e = (*com->c_func)(0); 429 break; 430 431 default: 432 errx(1, "Unknown argtype"); 433 } 434 435 out: 436 /* 437 * Exit the current source file on 438 * error. 439 */ 440 if (e) { 441 if (e < 0) 442 return (1); 443 if (loading) 444 return (1); 445 if (sourcing) 446 unstack(); 447 return (0); 448 } 449 if (com == NULL) 450 return (0); 451 if (value("autoprint") != NULL && com->c_argtype & P) 452 if ((dot->m_flag & MDELETED) == 0) { 453 muvec[0] = dot - &message[0] + 1; 454 muvec[1] = 0; 455 type(muvec); 456 } 457 if (!sourcing && (com->c_argtype & T) == 0) 458 sawcom = 1; 459 return (0); 460 } 461 462 /* 463 * Set the size of the message vector used to construct argument 464 * lists to message list functions. 465 */ 466 void 467 setmsize(int sz) 468 { 469 if (msgvec != NULL) 470 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 int inithdr; /* am printing startup headers */ 527 528 /*ARGSUSED*/ 529 void 530 intr(int s) 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 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 sigemptyset(&nset); 559 sigaddset(&nset, s); 560 sigprocmask(SIG_UNBLOCK, &nset, NULL); 561 kill(0, s); 562 sigprocmask(SIG_BLOCK, &nset, NULL); 563 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 /*ARGSUSED*/ 574 void 575 hangup(int s) 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 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 /*ARGSUSED*/ 667 int 668 pversion(int e) 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 Fclose(in); 693 } 694