1 #ifndef lint 2 static char sccsid[] = "@(#)msgs.c 4.5 04/17/83"; 3 #endif lint 4 /* 5 * msgs - a user bulletin board program 6 * 7 * usage: 8 * msgs [fhlopq] [[-]number] to read messages 9 * msgs -s to place messages 10 * msgs -c [-days] to clean up the bulletin board 11 * 12 * prompt commands are: 13 * y print message 14 * n flush message, go to next message 15 * q flush message, quit 16 * p print message, turn on 'pipe thru more' mode 17 * P print message, turn off 'pipe thru more' mode 18 * - reprint last message 19 * s[-][<num>] [<filename>] save message 20 * m[-][<num>] mail with message in temp mbox 21 * x exit without flushing this message 22 */ 23 24 #define V7 /* will look for TERM in the environment */ 25 #define OBJECT /* will object to messages without Subjects */ 26 /* #define REJECT /* will reject messages without Subjects 27 (OBJECT must be defined also) */ 28 /* #define UNBUFFERED /* use unbuffered output */ 29 30 #include <stdio.h> 31 #include <sys/param.h> 32 #include <signal.h> 33 #include <dir.h> 34 #include <sys/stat.h> 35 #include <ctype.h> 36 #include <pwd.h> 37 #include <sgtty.h> 38 #include "msgs.h" 39 40 #define CMODE 0666 /* bounds file creation mode */ 41 #define NO 0 42 #define YES 1 43 #define SUPERUSER 0 /* superuser uid */ 44 #define DAEMON 1 /* daemon uid */ 45 #define NLINES 24 /* default number of lines/crt screen */ 46 #define NDAYS 21 /* default keep time for messages */ 47 #define DAYS *24*60*60 /* seconds/day */ 48 #define TEMP "/tmp/msgXXXXXX" 49 #define MSGSRC ".msgsrc" /* user's rc file */ 50 #define BOUNDS "bounds" /* message bounds file */ 51 #define NEXT "Next message? [yq]" 52 #define MORE "More? [ynq]" 53 #define NOMORE "(No more) [q] ?" 54 55 typedef char bool; 56 57 FILE *newmsg; 58 char *sep = "-"; 59 char inbuf[BUFSIZ]; 60 char fname[128]; 61 char cmdbuf[128]; 62 char subj[128]; 63 char from[128]; 64 char date[128]; 65 char *ptr; 66 char *in; 67 bool local; 68 bool ruptible; 69 bool totty; 70 bool seenfrom; 71 bool seensubj; 72 bool blankline; 73 bool printing = NO; 74 bool mailing = NO; 75 bool quitit = NO; 76 bool sending = NO; 77 bool intrpflg = NO; 78 bool tstpflag = NO; 79 int uid; 80 int msg; 81 int prevmsg; 82 int lct; 83 int nlines; 84 int Lpp = NLINES; 85 time_t t; 86 time_t keep; 87 struct sgttyb otty; 88 89 char *ctime(); 90 char *nxtfld(); 91 int onintr(); 92 int onsusp(); 93 off_t ftell(); 94 FILE *popen(); 95 struct passwd *getpwuid(); 96 97 extern int errno; 98 99 /* option initialization */ 100 bool hdrs = NO; 101 bool qopt = NO; 102 bool hush = NO; 103 bool send = NO; 104 bool locomode = NO; 105 bool pause = NO; 106 bool clean = NO; 107 bool lastcmd = NO; 108 109 main(argc, argv) 110 int argc; char *argv[]; 111 { 112 bool newrc, already; 113 int rcfirst = 0; /* first message to print (from .rc) */ 114 int rcback = 0; /* amount to back off of rcfirst*/ 115 int firstmsg, nextmsg, lastmsg = 0; 116 int blast = 0; 117 FILE *bounds, *msgsrc; 118 119 #ifndef UNBUFFERED 120 char obuf[BUFSIZ]; 121 setbuf(stdout, obuf); 122 #else 123 setbuf(stdout, NULL); 124 #endif 125 126 gtty(fileno(stdout), &otty); 127 time(&t); 128 setuid(uid = getuid()); 129 ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL); 130 if (ruptible) 131 signal(SIGINT, SIG_DFL); 132 133 argc--, argv++; 134 while (argc > 0) { 135 if (isdigit(argv[0][0])) { /* starting message # */ 136 rcfirst = atoi(argv[0]); 137 } 138 else if (isdigit(argv[0][1])) { /* backward offset */ 139 rcback = atoi( &( argv[0][1] ) ); 140 } 141 else { 142 ptr = *argv; 143 while (*ptr) switch (*ptr++) { 144 145 case '-': 146 break; 147 148 case 'c': 149 if (uid != SUPERUSER && uid != DAEMON) { 150 fprintf(stderr, "Sorry\n"); 151 exit(1); 152 } 153 clean = YES; 154 break; 155 156 case 'f': /* silently */ 157 hush = YES; 158 break; 159 160 case 'h': /* headers only */ 161 hdrs = YES; 162 break; 163 164 case 'l': /* local msgs only */ 165 locomode = YES; 166 break; 167 168 case 'o': /* option to save last message */ 169 lastcmd = YES; 170 break; 171 172 case 'p': /* pipe thru 'more' during long msgs */ 173 pause = YES; 174 break; 175 176 case 'q': /* query only */ 177 qopt = YES; 178 break; 179 180 case 's': /* sending TO msgs */ 181 send = YES; 182 break; 183 184 default: 185 fprintf(stderr, 186 "usage: msgs [fhlopq] [[-]number]\n"); 187 exit(1); 188 } 189 } 190 argc--, argv++; 191 } 192 193 /* 194 * determine current message bounds 195 */ 196 sprintf(fname, "%s/%s", USRMSGS, BOUNDS); 197 bounds = fopen(fname, "r"); 198 199 if (bounds != NULL) { 200 fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg); 201 fclose(bounds); 202 blast = lastmsg; /* save upper bound */ 203 } 204 205 if (clean) 206 keep = t - (rcback? rcback : NDAYS) DAYS; 207 208 if (clean || bounds == NULL) { /* relocate message bounds */ 209 struct direct *dp; 210 struct stat stbuf; 211 bool seenany = NO; 212 DIR *dirp; 213 214 dirp = opendir(USRMSGS); 215 if (dirp == NULL) { 216 perror(USRMSGS); 217 exit(errno); 218 } 219 220 firstmsg = 32767; 221 lastmsg = 0; 222 223 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){ 224 register char *cp = dp->d_name; 225 register int i = 0; 226 227 if (dp->d_ino == 0) 228 continue; 229 if (dp->d_namlen == 0) 230 continue; 231 232 if (clean) 233 sprintf(inbuf, "%s/%s", USRMSGS, cp); 234 235 while (isdigit(*cp)) 236 i = i * 10 + *cp++ - '0'; 237 if (*cp) 238 continue; /* not a message! */ 239 240 if (clean) { 241 if (stat(inbuf, &stbuf) != 0) 242 continue; 243 if (stbuf.st_mtime < keep 244 && stbuf.st_mode&S_IWRITE) { 245 unlink(inbuf); 246 continue; 247 } 248 } 249 250 if (i > lastmsg) 251 lastmsg = i; 252 if (i < firstmsg) 253 firstmsg = i; 254 seenany = YES; 255 } 256 closedir(dirp); 257 258 if (!seenany) { 259 if (blast != 0) /* never lower the upper bound! */ 260 lastmsg = blast; 261 firstmsg = lastmsg + 1; 262 } 263 else if (blast > lastmsg) 264 lastmsg = blast; 265 266 if (!send) { 267 bounds = fopen(fname, "w"); 268 if (bounds == NULL) { 269 perror(fname); 270 exit(errno); 271 } 272 chmod(fname, CMODE); 273 fprintf(bounds, "%d %d\n", firstmsg, lastmsg); 274 fclose(bounds); 275 } 276 } 277 278 if (send) { 279 /* 280 * Send mode - place msgs in USRMSGS 281 */ 282 bounds = fopen(fname, "w"); 283 if (bounds == NULL) { 284 perror(fname); 285 exit(errno); 286 } 287 288 nextmsg = lastmsg + 1; 289 sprintf(fname, "%s/%d", USRMSGS, nextmsg); 290 newmsg = fopen(fname, "w"); 291 if (newmsg == NULL) { 292 perror(fname); 293 exit(errno); 294 } 295 chmod(fname, 0644); 296 297 fprintf(bounds, "%d %d\n", firstmsg, nextmsg); 298 fclose(bounds); 299 300 sending = YES; 301 if (ruptible) 302 signal(SIGINT, onintr); 303 304 if (isatty(fileno(stdin))) { 305 ptr = getpwuid(uid)->pw_name; 306 printf("Message %d:\nFrom %s %sSubject: ", 307 nextmsg, ptr, ctime(&t)); 308 fflush(stdout); 309 fgets(inbuf, sizeof inbuf, stdin); 310 putchar('\n'); 311 fflush(stdout); 312 fprintf(newmsg, "From %s %sSubject: %s\n", 313 ptr, ctime(&t), inbuf); 314 blankline = seensubj = YES; 315 } 316 else 317 blankline = seensubj = NO; 318 for (;;) { 319 fgets(inbuf, sizeof inbuf, stdin); 320 if (feof(stdin) || ferror(stdin)) 321 break; 322 blankline = (blankline || (inbuf[0] == '\n')); 323 seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0))); 324 fputs(inbuf, newmsg); 325 } 326 #ifdef OBJECT 327 if (!seensubj) { 328 printf("NOTICE: Messages should have a Subject field!\n"); 329 #ifdef REJECT 330 unlink(fname); 331 #endif 332 exit(1); 333 } 334 #endif 335 exit(ferror(stdin)); 336 } 337 if (clean) 338 exit(0); 339 340 /* 341 * prepare to display messages 342 */ 343 totty = (isatty(fileno(stdout)) != 0); 344 pause = pause && totty; 345 346 sprintf(fname, "%s/%s", getenv("HOME"), MSGSRC); 347 msgsrc = fopen(fname, "r"); 348 if (msgsrc) { 349 newrc = NO; 350 fscanf(msgsrc, "%d\n", &nextmsg); 351 fclose(msgsrc); 352 if (!rcfirst) 353 rcfirst = nextmsg - rcback; 354 } 355 else { 356 newrc = YES; 357 nextmsg = 0; 358 } 359 msgsrc = fopen(fname, "a"); 360 if (msgsrc == NULL) { 361 perror(fname); 362 exit(errno); 363 } 364 if (rcfirst) 365 firstmsg = rcfirst; 366 if (newrc) { 367 nextmsg = firstmsg; 368 fseek(msgsrc, 0L, 0); 369 fprintf(msgsrc, "%d\n", nextmsg); 370 fflush(msgsrc); 371 } 372 373 #ifdef V7 374 if (totty) { 375 if (tgetent(inbuf, getenv("TERM")) <= 0 376 || (Lpp = tgetnum("li")) <= 0) { 377 Lpp = NLINES; 378 } 379 } 380 #endif 381 Lpp -= 6; /* for headers, etc. */ 382 383 already = NO; 384 prevmsg = firstmsg; 385 printing = YES; 386 if (ruptible) 387 signal(SIGINT, onintr); 388 389 /* 390 * Main program loop 391 */ 392 for (msg = firstmsg; msg <= lastmsg; msg++) { 393 394 sprintf(fname, "%s/%d", USRMSGS, msg); 395 newmsg = fopen(fname, "r"); 396 if (newmsg == NULL) 397 continue; 398 399 gfrsub(newmsg); /* get From and Subject fields */ 400 if (locomode && !local) { 401 fclose(newmsg); 402 continue; 403 } 404 405 if (qopt) { /* This has to be located here */ 406 printf("There are new messages.\n"); 407 exit(0); 408 } 409 410 if (already && !hdrs) 411 putchar('\n'); 412 already = YES; 413 414 /* 415 * Print header 416 */ 417 again: 418 tstpflag = NO; 419 if (totty) 420 signal(SIGTSTP, onsusp); 421 nlines = 2; 422 if (seenfrom) { 423 printf("Message %d:\nFrom %s %s", msg, from, date); 424 nlines++; 425 } 426 if (seensubj) { 427 printf("Subject: %s", subj); 428 nlines++; 429 } 430 else { 431 if (seenfrom) { 432 putchar('\n'); 433 nlines++; 434 } 435 while (nlines < 6 436 && fgets(inbuf, sizeof inbuf, newmsg) 437 && inbuf[0] != '\n') { 438 fputs(inbuf, stdout); 439 nlines++; 440 } 441 } 442 443 lct = linecnt(newmsg); 444 if (lct) 445 printf("(%d%slines) ", lct, seensubj? " " : " more "); 446 447 if (hdrs) { 448 printf("\n-----\n"); 449 fclose(newmsg); 450 continue; 451 } 452 453 /* 454 * Ask user for command 455 */ 456 if (totty) 457 ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT)); 458 else 459 inbuf[0] = 'y'; 460 if (totty) 461 signal(SIGTSTP, SIG_DFL); 462 /* 463 * Loop if we've been suspended 464 */ 465 if (tstpflag) 466 goto again; 467 cmnd: 468 in = inbuf; 469 switch (*in) { 470 case 'x': 471 case 'X': 472 exit(0); 473 474 case 'q': 475 case 'Q': 476 quitit = YES; 477 printf("--Postponed--\n"); 478 exit(0); 479 /* intentional fall-thru */ 480 case 'n': 481 case 'N': 482 if (msg >= nextmsg) sep = "Flushed"; 483 break; 484 485 case 'p': 486 case 'P': 487 pause = (*in++ == 'p'); 488 /* intentional fallthru */ 489 case '\n': 490 case 'y': 491 default: 492 if (*in == '-') { 493 msg = prevmsg-1; 494 sep = "replay"; 495 break; 496 } 497 if (isdigit(*in)) { 498 msg = next(in); 499 sep = in; 500 break; 501 } 502 503 prmesg(nlines + lct + (seensubj? 1 : 0)); 504 prevmsg = msg; 505 506 } 507 508 printf("--%s--\n", sep); 509 sep = "-"; 510 if (msg >= nextmsg) { 511 nextmsg = msg + 1; 512 fseek(msgsrc, 0L, 0); 513 fprintf(msgsrc, "%d\n", nextmsg); 514 fflush(msgsrc); 515 } 516 if (newmsg) 517 fclose(newmsg); 518 if (quitit) 519 break; 520 } 521 522 if (already && !quitit && lastcmd && totty) { 523 /* 524 * save or reply to last message? 525 */ 526 msg = prevmsg; 527 ask(NOMORE); 528 if (inbuf[0] == '-' || isdigit(inbuf[0])) 529 goto cmnd; 530 } 531 if (!(already || hush || qopt)) 532 printf("No new messages.\n"); 533 exit(0); 534 } 535 536 prmesg(length) 537 int length; 538 { 539 FILE *outf, *inf; 540 int c; 541 542 if (pause && length > Lpp) { 543 sprintf(cmdbuf, PAGE, Lpp); 544 outf = popen(cmdbuf, "w"); 545 if (!outf) 546 outf = stdout; 547 else 548 setbuf(outf, NULL); 549 } 550 else 551 outf = stdout; 552 553 if (seensubj) 554 putc('\n', outf); 555 556 while (fgets(inbuf, sizeof inbuf, newmsg)) 557 fputs(inbuf, outf); 558 559 if (outf != stdout) { 560 pclose(outf); 561 } 562 else { 563 fflush(stdout); 564 } 565 566 /* trick to force wait on output */ 567 stty(fileno(stdout), &otty); 568 } 569 570 onintr() 571 { 572 signal(SIGINT, onintr); 573 if (mailing) 574 unlink(fname); 575 if (sending) { 576 unlink(fname); 577 puts("--Killed--"); 578 exit(1); 579 } 580 if (printing) { 581 putchar('\n'); 582 if (hdrs) 583 exit(0); 584 sep = "Interrupt"; 585 if (newmsg) 586 fseek(newmsg, 0L, 2); 587 intrpflg = YES; 588 } 589 } 590 591 /* 592 * We have just gotten a susp. Suspend and prepare to resume. 593 */ 594 onsusp() 595 { 596 tstpflag = YES; 597 signal(SIGTSTP, SIG_DFL); 598 kill(0, SIGTSTP); 599 600 /* the pc stops here */ 601 602 signal(SIGTSTP, onsusp); 603 } 604 605 linecnt(f) 606 FILE *f; 607 { 608 off_t oldpos = ftell(f); 609 int l = 0; 610 char lbuf[BUFSIZ]; 611 612 while (fgets(lbuf, sizeof lbuf, f)) 613 l++; 614 clearerr(f); 615 fseek(f, oldpos, 0); 616 return (l); 617 } 618 619 next(buf) 620 char *buf; 621 { 622 int i; 623 sscanf(buf, "%d", &i); 624 sprintf(buf, "Goto %d", i); 625 return(--i); 626 } 627 628 ask(prompt) 629 char *prompt; 630 { 631 char inch; 632 int n, cmsg; 633 off_t oldpos; 634 FILE *cpfrom, *cpto; 635 636 printf("%s ", prompt); 637 fflush(stdout); 638 intrpflg = NO; 639 gets(inbuf); 640 if (intrpflg) 641 inbuf[0] = 'x'; 642 643 /* 644 * Handle 'mail' and 'save' here. 645 */ 646 if ((inch = inbuf[0]) == 's' || inch == 'm') { 647 if (inbuf[1] == '-') 648 cmsg = prevmsg; 649 else if (isdigit(inbuf[1])) 650 cmsg = atoi(&inbuf[1]); 651 else 652 cmsg = msg; 653 sprintf(fname, "%s/%d", USRMSGS, cmsg); 654 655 oldpos = ftell(newmsg); 656 657 cpfrom = fopen(fname, "r"); 658 if (!cpfrom) { 659 printf("Message %d not found\n", cmsg); 660 ask (prompt); 661 return; 662 } 663 664 if (inch == 's') { 665 in = nxtfld(inbuf); 666 if (*in) { 667 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */ 668 fname[n] = in[n]; 669 } 670 fname[n] = NULL; 671 } 672 else 673 strcpy(fname, "Messages"); 674 } 675 else { 676 strcpy(fname, TEMP); 677 mktemp(fname); 678 sprintf(cmdbuf, MAIL, fname); 679 mailing = YES; 680 } 681 cpto = fopen(fname, "a"); 682 if (!cpto) { 683 perror(fname); 684 mailing = NO; 685 fseek(newmsg, oldpos, 0); 686 ask(prompt); 687 return; 688 } 689 690 while (n = fread(inbuf, 1, sizeof inbuf, cpfrom)) 691 fwrite(inbuf, 1, n, cpto); 692 693 fclose(cpfrom); 694 fclose(cpto); 695 fseek(newmsg, oldpos, 0); /* reposition current message */ 696 if (inch == 's') 697 printf("Message %d saved in \"%s\"\n", cmsg, fname); 698 else { 699 system(cmdbuf); 700 unlink(fname); 701 mailing = NO; 702 } 703 ask(prompt); 704 } 705 } 706 707 gfrsub(infile) 708 FILE *infile; 709 { 710 off_t frompos; 711 712 seensubj = seenfrom = NO; 713 local = YES; 714 subj[0] = from[0] = date[0] = NULL; 715 716 /* 717 * Is this a normal message? 718 */ 719 if (fgets(inbuf, sizeof inbuf, infile)) { 720 if (strncmp(inbuf, "From", 4)==0) { 721 /* 722 * expected form starts with From 723 */ 724 seenfrom = YES; 725 frompos = ftell(infile); 726 ptr = from; 727 in = nxtfld(inbuf); 728 if (*in) while (*in && *in > ' ') { 729 if (*in == ':' || *in == '@' || *in == '!') 730 local = NO; 731 *ptr++ = *in++; 732 /* what about sizeof from ? */ 733 } 734 *ptr = NULL; 735 if (*(in = nxtfld(in))) 736 strncpy(date, in, sizeof date); 737 else { 738 date[0] = '\n'; 739 date[1] = NULL; 740 } 741 } 742 else { 743 /* 744 * not the expected form 745 */ 746 fseek(infile, 0L, 0); 747 return; 748 } 749 } 750 else 751 /* 752 * empty file ? 753 */ 754 return; 755 756 /* 757 * look for Subject line until EOF or a blank line 758 */ 759 while (fgets(inbuf, sizeof inbuf, infile) 760 && !(blankline = (inbuf[0] == '\n'))) { 761 /* 762 * extract Subject line 763 */ 764 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) { 765 seensubj = YES; 766 frompos = ftell(infile); 767 strncpy(subj, nxtfld(inbuf), sizeof subj); 768 } 769 } 770 if (!blankline) 771 /* 772 * ran into EOF 773 */ 774 fseek(infile, frompos, 0); 775 776 if (!seensubj) 777 /* 778 * for possible use with Mail 779 */ 780 strncpy(subj, "(No Subject)\n", sizeof subj); 781 } 782 783 char * 784 nxtfld(s) 785 char *s; 786 { 787 if (*s) while (*s && *s > ' ') s++; /* skip over this field */ 788 if (*s) while (*s && *s <= ' ') s++; /* find start of next field */ 789 return (s); 790 } 791