| 1 | #include <stdio.h> |
| 2 | #include <pwd.h> |
| 3 | #include <utmp.h> |
| 4 | #include <signal.h> |
| 5 | #include <sys/types.h> |
| 6 | #include <sys/stat.h> |
| 7 | #include <setjmp.h> |
| 8 | |
| 9 | /*copylet flags */ |
| 10 | /*remote mail, add rmtmsg */ |
| 11 | #define REMOTE 1 |
| 12 | /* zap header and trailing empty line */ |
| 13 | #define ZAP 3 |
| 14 | #define ORDINARY 2 |
| 15 | #define FORWARD 4 |
| 16 | #define LSIZE 256 |
| 17 | #define MAXLET 300 /* maximum number of letters */ |
| 18 | #define MAILMODE (~0644) /* mode of created mail */ |
| 19 | |
| 20 | char line[LSIZE]; |
| 21 | char resp[LSIZE]; |
| 22 | struct let { |
| 23 | long adr; |
| 24 | char change; |
| 25 | } let[MAXLET]; |
| 26 | int nlet = 0; |
| 27 | char lfil[50]; |
| 28 | long iop, time(); |
| 29 | char lettmp[] = "/tmp/maXXXXX"; |
| 30 | char maildir[] = "/usr/spool/mail/"; |
| 31 | char mailfile[] = "/usr/spool/mail/xxxxxxxxxxxxxxxxxxxxxxx"; |
| 32 | char dead[] = "dead.letter"; |
| 33 | char *rmtmsg = " remote from vax135\n"; /*LOCAL*/ |
| 34 | char *thissys = "vax135"; /*LOCAL*/ |
| 35 | char forwmsg[] = " forwarded\n"; |
| 36 | char *curlock; |
| 37 | int lockerror; |
| 38 | FILE *tmpf; |
| 39 | FILE *malf; |
| 40 | char *my_name; |
| 41 | char *getlogin(); |
| 42 | struct passwd *getpwuid(); |
| 43 | int error; |
| 44 | int locked; |
| 45 | int changed; |
| 46 | int forward; |
| 47 | char from[] = "From "; |
| 48 | long ftell(); |
| 49 | int delete(); |
| 50 | char *ctime(); |
| 51 | int flgf; |
| 52 | int flgp; |
| 53 | int delflg = 1; |
| 54 | jmp_buf sjbuf; |
| 55 | |
| 56 | main(argc, argv) |
| 57 | char **argv; |
| 58 | { |
| 59 | register i; |
| 60 | char sobuf[BUFSIZ]; |
| 61 | |
| 62 | setbuf(stdout, sobuf); |
| 63 | mktemp(lettmp); |
| 64 | unlink(lettmp); |
| 65 | my_name = getlogin(); |
| 66 | if (my_name == NULL) { |
| 67 | struct passwd *pwent; |
| 68 | pwent = getpwuid(getuid()); |
| 69 | if (pwent==NULL) |
| 70 | my_name = "???"; |
| 71 | else |
| 72 | my_name = pwent->pw_name; |
| 73 | } |
| 74 | if(setjmp(sjbuf)) done(); |
| 75 | for (i=0; i<20; i++) |
| 76 | setsig(i, delete); |
| 77 | tmpf = fopen(lettmp, "w"); |
| 78 | if (tmpf == NULL) { |
| 79 | fprintf(stderr, "mail: cannot open %s for writing\n", lettmp); |
| 80 | done(); |
| 81 | } |
| 82 | if (argv[0][0] != 'r' && /* no favors for rmail*/ |
| 83 | (argc == 1 || argv[1][0] == '-')) |
| 84 | printmail(argc, argv); |
| 85 | else |
| 86 | sendmail(argc, argv); |
| 87 | done(); |
| 88 | } |
| 89 | |
| 90 | setsig(i, f) |
| 91 | int i; |
| 92 | int (*f)(); |
| 93 | { |
| 94 | if(signal(i, SIG_IGN)!=SIG_IGN) |
| 95 | signal(i, f); |
| 96 | } |
| 97 | |
| 98 | printmail(argc, argv) |
| 99 | char **argv; |
| 100 | { |
| 101 | int flg, i, j, print; |
| 102 | char *p, *getarg(); |
| 103 | |
| 104 | setuid(getuid()); |
| 105 | cat(mailfile, maildir, my_name); |
| 106 | for (; argc>1; argv++, argc--) { |
| 107 | if (argv[1][0]=='-') { |
| 108 | if (argv[1][1]=='q') |
| 109 | delflg = 0; |
| 110 | else if (argv[1][1]=='p') { |
| 111 | flgp++; |
| 112 | delflg = 0; |
| 113 | } else if (argv[1][1]=='f') { |
| 114 | if (argc>=3) { |
| 115 | strcpy(mailfile, argv[2]); |
| 116 | argv++; |
| 117 | argc--; |
| 118 | } |
| 119 | } else if (argv[1][1]=='r') { |
| 120 | forward = 1; |
| 121 | } else { |
| 122 | fprintf(stderr, "mail: unknown option %c\n", argv[1][1]); |
| 123 | done(); |
| 124 | } |
| 125 | } else |
| 126 | break; |
| 127 | } |
| 128 | malf = fopen(mailfile, "r"); |
| 129 | if (malf == NULL) { |
| 130 | fprintf(stdout, "No mail.\n"); |
| 131 | return; |
| 132 | } |
| 133 | lock(mailfile); |
| 134 | copymt(malf, tmpf); |
| 135 | fclose(malf); |
| 136 | fclose(tmpf); |
| 137 | unlock(); |
| 138 | tmpf = fopen(lettmp, "r"); |
| 139 | |
| 140 | changed = 0; |
| 141 | print = 1; |
| 142 | for (i = 0; i < nlet; ) { |
| 143 | j = forward ? i : nlet - i - 1; |
| 144 | if(setjmp(sjbuf)) { |
| 145 | print=0; |
| 146 | } else { |
| 147 | if (print) |
| 148 | copylet(j, stdout, ORDINARY); |
| 149 | print = 1; |
| 150 | } |
| 151 | if (flgp) { |
| 152 | i++; |
| 153 | continue; |
| 154 | } |
| 155 | setjmp(sjbuf); |
| 156 | fprintf(stdout, "? "); |
| 157 | fflush(stdout); |
| 158 | if (fgets(resp, LSIZE, stdin) == NULL) |
| 159 | break; |
| 160 | switch (resp[0]) { |
| 161 | |
| 162 | default: |
| 163 | fprintf(stderr, "usage\n"); |
| 164 | case '?': |
| 165 | print = 0; |
| 166 | fprintf(stderr, "q\tquit\n"); |
| 167 | fprintf(stderr, "x\texit without changing mail\n"); |
| 168 | fprintf(stderr, "p\tprint\n"); |
| 169 | fprintf(stderr, "s[file]\tsave (default mbox)\n"); |
| 170 | fprintf(stderr, "w[file]\tsame without header\n"); |
| 171 | fprintf(stderr, "-\tprint previous\n"); |
| 172 | fprintf(stderr, "d\tdelete\n"); |
| 173 | fprintf(stderr, "+\tnext (no delete)\n"); |
| 174 | fprintf(stderr, "m user\tmail to user\n"); |
| 175 | fprintf(stderr, "! cmd\texecute cmd\n"); |
| 176 | break; |
| 177 | |
| 178 | case '+': |
| 179 | case 'n': |
| 180 | case '\n': |
| 181 | i++; |
| 182 | break; |
| 183 | case 'x': |
| 184 | changed = 0; |
| 185 | case 'q': |
| 186 | goto donep; |
| 187 | case 'p': |
| 188 | break; |
| 189 | case '^': |
| 190 | case '-': |
| 191 | if (--i < 0) |
| 192 | i = 0; |
| 193 | break; |
| 194 | case 'y': |
| 195 | case 'w': |
| 196 | case 's': |
| 197 | flg = 0; |
| 198 | if (resp[1] != '\n' && resp[1] != ' ') { |
| 199 | printf("illegal\n"); |
| 200 | flg++; |
| 201 | print = 0; |
| 202 | continue; |
| 203 | } |
| 204 | if (resp[1] == '\n' || resp[1] == '\0') |
| 205 | cat(resp+1, "mbox", ""); |
| 206 | for (p = resp+1; (p = getarg(lfil, p)) != NULL; ) { |
| 207 | malf = fopen(lfil, "a"); |
| 208 | if (malf == NULL) { |
| 209 | fprintf(stdout, "mail: cannot append to %s\n", lfil); |
| 210 | flg++; |
| 211 | continue; |
| 212 | } |
| 213 | copylet(j, malf, resp[0]=='w'? ZAP: ORDINARY); |
| 214 | fclose(malf); |
| 215 | } |
| 216 | if (flg) |
| 217 | print = 0; |
| 218 | else { |
| 219 | let[j].change = 'd'; |
| 220 | changed++; |
| 221 | i++; |
| 222 | } |
| 223 | break; |
| 224 | case 'm': |
| 225 | flg = 0; |
| 226 | if (resp[1] == '\n' || resp[1] == '\0') { |
| 227 | i++; |
| 228 | continue; |
| 229 | } |
| 230 | if (resp[1] != ' ') { |
| 231 | printf("invalid command\n"); |
| 232 | flg++; |
| 233 | print = 0; |
| 234 | continue; |
| 235 | } |
| 236 | for (p = resp+1; (p = getarg(lfil, p)) != NULL; ) |
| 237 | if (!sendrmt(j, lfil)) /* couldn't send it */ |
| 238 | flg++; |
| 239 | if (flg) |
| 240 | print = 0; |
| 241 | else { |
| 242 | let[j].change = 'd'; |
| 243 | changed++; |
| 244 | i++; |
| 245 | } |
| 246 | break; |
| 247 | case '!': |
| 248 | system(resp+1); |
| 249 | printf("!\n"); |
| 250 | print = 0; |
| 251 | break; |
| 252 | case 'd': |
| 253 | let[j].change = 'd'; |
| 254 | changed++; |
| 255 | i++; |
| 256 | if (resp[1] == 'q') |
| 257 | goto donep; |
| 258 | break; |
| 259 | } |
| 260 | } |
| 261 | donep: |
| 262 | if (changed) |
| 263 | copyback(); |
| 264 | } |
| 265 | |
| 266 | copyback() /* copy temp or whatever back to /usr/spool/mail */ |
| 267 | { |
| 268 | register i, n, c; |
| 269 | int new = 0; |
| 270 | struct stat stbuf; |
| 271 | |
| 272 | signal(SIGINT, SIG_IGN); |
| 273 | signal(SIGHUP, SIG_IGN); |
| 274 | signal(SIGQUIT, SIG_IGN); |
| 275 | lock(mailfile); |
| 276 | stat(mailfile, &stbuf); |
| 277 | if (stbuf.st_size != let[nlet].adr) { /* new mail has arrived */ |
| 278 | malf = fopen(mailfile, "r"); |
| 279 | if (malf == NULL) { |
| 280 | fprintf(stdout, "mail: can't re-read %s\n", mailfile); |
| 281 | done(); |
| 282 | } |
| 283 | fseek(malf, let[nlet].adr, 0); |
| 284 | fclose(tmpf); |
| 285 | tmpf = fopen(lettmp, "a"); |
| 286 | fseek(tmpf, let[nlet].adr, 0); |
| 287 | while ((c = fgetc(malf)) != EOF) |
| 288 | fputc(c, tmpf); |
| 289 | fclose(malf); |
| 290 | fclose(tmpf); |
| 291 | tmpf = fopen(lettmp, "r"); |
| 292 | let[++nlet].adr = stbuf.st_size; |
| 293 | new = 1; |
| 294 | } |
| 295 | malf = fopen(mailfile, "w"); |
| 296 | if (malf == NULL) { |
| 297 | fprintf(stderr, "mail: can't rewrite %s\n", lfil); |
| 298 | done(); |
| 299 | } |
| 300 | n = 0; |
| 301 | for (i = 0; i < nlet; i++) |
| 302 | if (let[i].change != 'd') { |
| 303 | copylet(i, malf, ORDINARY); |
| 304 | n++; |
| 305 | } |
| 306 | fclose(malf); |
| 307 | if (new) |
| 308 | fprintf(stdout, "new mail arrived\n"); |
| 309 | unlock(); |
| 310 | } |
| 311 | |
| 312 | copymt(f1, f2) /* copy mail (f1) to temp (f2) */ |
| 313 | FILE *f1, *f2; |
| 314 | { |
| 315 | long nextadr; |
| 316 | |
| 317 | nlet = nextadr = 0; |
| 318 | let[0].adr = 0; |
| 319 | while (fgets(line, LSIZE, f1) != NULL) { |
| 320 | if (isfrom(line)) |
| 321 | let[nlet++].adr = nextadr; |
| 322 | nextadr += strlen(line); |
| 323 | fputs(line, f2); |
| 324 | } |
| 325 | let[nlet].adr = nextadr; /* last plus 1 */ |
| 326 | } |
| 327 | |
| 328 | copylet(n, f, type) FILE *f; |
| 329 | { int ch, k; |
| 330 | fseek(tmpf, let[n].adr, 0); |
| 331 | k = let[n+1].adr - let[n].adr; |
| 332 | while(k-- > 1 && (ch=fgetc(tmpf))!='\n') |
| 333 | if(type!=ZAP) fputc(ch,f); |
| 334 | if(type==REMOTE) |
| 335 | fprintf(f, rmtmsg); |
| 336 | else if (type==FORWARD) |
| 337 | fprintf(f, forwmsg); |
| 338 | else if(type==ORDINARY) |
| 339 | fputc(ch,f); |
| 340 | while(k-->1) |
| 341 | fputc(ch=fgetc(tmpf), f); |
| 342 | if(type!=ZAP || ch!= '\n') |
| 343 | fputc(fgetc(tmpf), f); |
| 344 | } |
| 345 | |
| 346 | isfrom(lp) |
| 347 | register char *lp; |
| 348 | { |
| 349 | register char *p; |
| 350 | |
| 351 | for (p = from; *p; ) |
| 352 | if (*lp++ != *p++) |
| 353 | return(0); |
| 354 | return(1); |
| 355 | } |
| 356 | |
| 357 | sendmail(argc, argv) |
| 358 | char **argv; |
| 359 | { |
| 360 | |
| 361 | time(&iop); |
| 362 | fprintf(tmpf, "%s%s %s", from, my_name, ctime(&iop)); |
| 363 | iop = ftell(tmpf); |
| 364 | flgf = 1; |
| 365 | while (fgets(line, LSIZE, stdin) != NULL) { |
| 366 | if (line[0] == '.' && line[1] == '\n') |
| 367 | break; |
| 368 | if (isfrom(line)) |
| 369 | fputs(">", tmpf); |
| 370 | fputs(line, tmpf); |
| 371 | flgf = 0; |
| 372 | } |
| 373 | fputs("\n", tmpf); |
| 374 | nlet = 1; |
| 375 | let[0].adr = 0; |
| 376 | let[1].adr = ftell(tmpf); |
| 377 | fclose(tmpf); |
| 378 | if (flgf) |
| 379 | return; |
| 380 | tmpf = fopen(lettmp, "r"); |
| 381 | if (tmpf == NULL) { |
| 382 | fprintf(stderr, "mail: cannot reopen %s for reading\n", lettmp); |
| 383 | return; |
| 384 | } |
| 385 | while (--argc > 0) |
| 386 | if (!send(0, *++argv)) /* couldn't send to him */ |
| 387 | error++; |
| 388 | if (error) { |
| 389 | setuid(getuid()); |
| 390 | malf = fopen(dead, "w"); |
| 391 | if (malf == NULL) { |
| 392 | fprintf(stdout, "mail: cannot open %s\n", dead); |
| 393 | fclose(tmpf); |
| 394 | return; |
| 395 | } |
| 396 | copylet(0, malf, ZAP); |
| 397 | fclose(malf); |
| 398 | fprintf(stdout, "Mail saved in %s\n", dead); |
| 399 | } |
| 400 | fclose(tmpf); |
| 401 | } |
| 402 | |
| 403 | sendrmt(n, name) |
| 404 | char *name; |
| 405 | { |
| 406 | FILE *rmf, *popen(); |
| 407 | register char *p; |
| 408 | char rsys[64], cmd[64]; |
| 409 | register local, pid; |
| 410 | int sts; |
| 411 | |
| 412 | local = 0; |
| 413 | if (*name=='!') |
| 414 | name++; |
| 415 | for(p=rsys; *name!='!'; *p++ = *name++) |
| 416 | if (*name=='\0') { |
| 417 | local++; |
| 418 | break; |
| 419 | } |
| 420 | *p = '\0'; |
| 421 | if ((!local && *name=='\0') || (local && *rsys=='\0')) { |
| 422 | fprintf(stdout, "null name\n"); |
| 423 | return(0); |
| 424 | } |
| 425 | if ((pid = fork()) == -1) { |
| 426 | fprintf(stderr, "mail: can't create proc for remote\n"); |
| 427 | return(0); |
| 428 | } |
| 429 | if (pid) { |
| 430 | while (wait(&sts) != pid) { |
| 431 | if (wait(&sts)==-1) |
| 432 | return(0); |
| 433 | } |
| 434 | return(!sts); |
| 435 | } |
| 436 | setuid(getuid()); |
| 437 | if (local) |
| 438 | sprintf(cmd, "mail %s", rsys); |
| 439 | else { |
| 440 | if (index(name+1, '!')) |
| 441 | sprintf(cmd, "uux - %s!rmail \\(%s\\)", rsys, name+1); |
| 442 | else |
| 443 | sprintf(cmd, "uux - %s!rmail %s", rsys, name+1); |
| 444 | } |
| 445 | if ((rmf=popen(cmd, "w")) == NULL) |
| 446 | exit(1); |
| 447 | copylet(n, rmf, local? FORWARD: REMOTE); |
| 448 | pclose(rmf); |
| 449 | exit(0); |
| 450 | } |
| 451 | |
| 452 | send(n, name) /* send letter n to name */ |
| 453 | int n; |
| 454 | char *name; |
| 455 | { |
| 456 | char file[50]; |
| 457 | register char *p; |
| 458 | register mask; |
| 459 | struct passwd *pw, *getpwnam(); |
| 460 | |
| 461 | for(p=name; *p!='!' &&*p!='\0'; p++) |
| 462 | ; |
| 463 | if (*p == '!') |
| 464 | return(sendrmt(n, name)); |
| 465 | if ((pw = getpwnam(name)) == NULL) { |
| 466 | fprintf(stdout, "mail: can't send to %s\n", name); |
| 467 | return(0); |
| 468 | } |
| 469 | cat(file, maildir, name); |
| 470 | mask = umask(MAILMODE); |
| 471 | malf = fopen(file, "a"); |
| 472 | umask(mask); |
| 473 | if (malf == NULL) { |
| 474 | fprintf(stdout, "mail: cannot append to %s\n", file); |
| 475 | return(0); |
| 476 | } |
| 477 | lock(file); |
| 478 | chown(file, pw->pw_uid, pw->pw_gid); |
| 479 | copylet(n, malf, ORDINARY); |
| 480 | fclose(malf); |
| 481 | unlock(); |
| 482 | return(1); |
| 483 | } |
| 484 | |
| 485 | delete(i) |
| 486 | { |
| 487 | setsig(i, delete); |
| 488 | fprintf(stderr, "\n"); |
| 489 | if(delflg) |
| 490 | longjmp(sjbuf, 1); |
| 491 | done(); |
| 492 | } |
| 493 | |
| 494 | done() |
| 495 | { |
| 496 | if(!lockerror) |
| 497 | unlock(); |
| 498 | unlink(lettmp); |
| 499 | exit(error+lockerror); |
| 500 | } |
| 501 | |
| 502 | lock(file) |
| 503 | char *file; |
| 504 | { |
| 505 | struct stat stbuf; |
| 506 | |
| 507 | if (locked || flgf) |
| 508 | return; |
| 509 | if (stat(file, &stbuf)<0) |
| 510 | return; |
| 511 | if (stbuf.st_mode&01) { /* user x bit is the lock */ |
| 512 | if (stbuf.st_ctime+60 >= time((long *)0)) { |
| 513 | fprintf(stderr, "%s busy; try again in a minute\n", file); |
| 514 | lockerror++; |
| 515 | done(); |
| 516 | } |
| 517 | } |
| 518 | locked = stbuf.st_mode & ~01; |
| 519 | curlock = file; |
| 520 | chmod(file, stbuf.st_mode|01); |
| 521 | } |
| 522 | |
| 523 | unlock() |
| 524 | { |
| 525 | if (locked) |
| 526 | chmod(curlock, locked); |
| 527 | locked = 0; |
| 528 | } |
| 529 | |
| 530 | cat(to, from1, from2) |
| 531 | char *to, *from1, *from2; |
| 532 | { |
| 533 | int i, j; |
| 534 | |
| 535 | j = 0; |
| 536 | for (i=0; from1[i]; i++) |
| 537 | to[j++] = from1[i]; |
| 538 | for (i=0; from2[i]; i++) |
| 539 | to[j++] = from2[i]; |
| 540 | to[j] = 0; |
| 541 | } |
| 542 | |
| 543 | char *getarg(s, p) /* copy p... into s, update p */ |
| 544 | register char *s, *p; |
| 545 | { |
| 546 | while (*p == ' ' || *p == '\t') |
| 547 | p++; |
| 548 | if (*p == '\n' || *p == '\0') |
| 549 | return(NULL); |
| 550 | while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0') |
| 551 | *s++ = *p++; |
| 552 | *s = '\0'; |
| 553 | return(p); |
| 554 | } |