1 /* Copyright 1988,1990,1993,1994 by Paul Vixie 2 * All rights reserved 3 * 4 * Distribute freely, except: don't remove my name from the source or 5 * documentation (don't take credit for my work), mark your changes (don't 6 * get me blamed for your possible bugs), don't alter or remove this 7 * notice. May be sold if buildable source is provided to buyer. No 8 * warrantee of any kind, express or implied, is included with this 9 * software; use at your own risk, responsibility for damages (if any) to 10 * anyone resulting from the use of this software rests entirely with the 11 * user. 12 * 13 * Send bug reports, bug fixes, enhancements, requests, flames, etc., and 14 * I'll try to keep a version up to date. I can be reached as follows: 15 * Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul 16 */ 17 18 #if !defined(lint) && !defined(LINT) 19 static const char rcsid[] = 20 "$FreeBSD$"; 21 #endif 22 23 /* vix 26jan87 [RCS has the rest of the log] 24 * vix 30dec86 [written] 25 */ 26 27 28 #include "cron.h" 29 #if SYS_TIME_H 30 # include <sys/time.h> 31 #else 32 # include <time.h> 33 #endif 34 #include <sys/file.h> 35 #include <sys/stat.h> 36 #include <err.h> 37 #include <errno.h> 38 #include <string.h> 39 #include <fcntl.h> 40 #if defined(SYSLOG) 41 # include <syslog.h> 42 #endif 43 44 45 #if defined(LOG_DAEMON) && !defined(LOG_CRON) 46 #define LOG_CRON LOG_DAEMON 47 #endif 48 49 50 static int LogFD = ERR; 51 52 53 int 54 strcmp_until(left, right, until) 55 char *left; 56 char *right; 57 int until; 58 { 59 register int diff; 60 61 while (*left && *left != until && *left == *right) { 62 left++; 63 right++; 64 } 65 66 if ((*left=='\0' || *left == until) && 67 (*right=='\0' || *right == until)) { 68 diff = 0; 69 } else { 70 diff = *left - *right; 71 } 72 73 return diff; 74 } 75 76 77 /* strdtb(s) - delete trailing blanks in string 's' and return new length 78 */ 79 int 80 strdtb(s) 81 char *s; 82 { 83 char *x = s; 84 85 /* scan forward to the null 86 */ 87 while (*x) 88 x++; 89 90 /* scan backward to either the first character before the string, 91 * or the last non-blank in the string, whichever comes first. 92 */ 93 do {x--;} 94 while (x >= s && isspace(*x)); 95 96 /* one character beyond where we stopped above is where the null 97 * goes. 98 */ 99 *++x = '\0'; 100 101 /* the difference between the position of the null character and 102 * the position of the first character of the string is the length. 103 */ 104 return x - s; 105 } 106 107 108 int 109 set_debug_flags(flags) 110 char *flags; 111 { 112 /* debug flags are of the form flag[,flag ...] 113 * 114 * if an error occurs, print a message to stdout and return FALSE. 115 * otherwise return TRUE after setting ERROR_FLAGS. 116 */ 117 118 #if !DEBUGGING 119 120 printf("this program was compiled without debugging enabled\n"); 121 return FALSE; 122 123 #else /* DEBUGGING */ 124 125 char *pc = flags; 126 127 DebugFlags = 0; 128 129 while (*pc) { 130 char **test; 131 int mask; 132 133 /* try to find debug flag name in our list. 134 */ 135 for ( test = DebugFlagNames, mask = 1; 136 *test && strcmp_until(*test, pc, ','); 137 test++, mask <<= 1 138 ) 139 ; 140 141 if (!*test) { 142 fprintf(stderr, 143 "unrecognized debug flag <%s> <%s>\n", 144 flags, pc); 145 return FALSE; 146 } 147 148 DebugFlags |= mask; 149 150 /* skip to the next flag 151 */ 152 while (*pc && *pc != ',') 153 pc++; 154 if (*pc == ',') 155 pc++; 156 } 157 158 if (DebugFlags) { 159 int flag; 160 161 fprintf(stderr, "debug flags enabled:"); 162 163 for (flag = 0; DebugFlagNames[flag]; flag++) 164 if (DebugFlags & (1 << flag)) 165 fprintf(stderr, " %s", DebugFlagNames[flag]); 166 fprintf(stderr, "\n"); 167 } 168 169 return TRUE; 170 171 #endif /* DEBUGGING */ 172 } 173 174 175 void 176 set_cron_uid() 177 { 178 #if defined(BSD) || defined(POSIX) 179 if (seteuid(ROOT_UID) < OK) 180 err(ERROR_EXIT, "seteuid"); 181 #else 182 if (setuid(ROOT_UID) < OK) 183 err(ERROR_EXIT, "setuid"); 184 #endif 185 } 186 187 188 void 189 set_cron_cwd() 190 { 191 struct stat sb; 192 193 /* first check for CRONDIR ("/var/cron" or some such) 194 */ 195 if (stat(CRONDIR, &sb) < OK && errno == ENOENT) { 196 warn("%s", CRONDIR); 197 if (OK == mkdir(CRONDIR, 0700)) { 198 warnx("%s: created", CRONDIR); 199 stat(CRONDIR, &sb); 200 } else { 201 err(ERROR_EXIT, "%s: mkdir", CRONDIR); 202 } 203 } 204 if (!(sb.st_mode & S_IFDIR)) 205 err(ERROR_EXIT, "'%s' is not a directory, bailing out", CRONDIR); 206 if (chdir(CRONDIR) < OK) 207 err(ERROR_EXIT, "cannot chdir(%s), bailing out", CRONDIR); 208 209 /* CRONDIR okay (now==CWD), now look at SPOOL_DIR ("tabs" or some such) 210 */ 211 if (stat(SPOOL_DIR, &sb) < OK && errno == ENOENT) { 212 warn("%s", SPOOL_DIR); 213 if (OK == mkdir(SPOOL_DIR, 0700)) { 214 warnx("%s: created", SPOOL_DIR); 215 stat(SPOOL_DIR, &sb); 216 } else { 217 err(ERROR_EXIT, "%s: mkdir", SPOOL_DIR); 218 } 219 } 220 if (!(sb.st_mode & S_IFDIR)) 221 err(ERROR_EXIT, "'%s' is not a directory, bailing out", SPOOL_DIR); 222 } 223 224 225 /* get_char(file) : like getc() but increment LineNumber on newlines 226 */ 227 int 228 get_char(file) 229 FILE *file; 230 { 231 int ch; 232 233 ch = getc(file); 234 if (ch == '\n') 235 Set_LineNum(LineNumber + 1) 236 return ch; 237 } 238 239 240 /* unget_char(ch, file) : like ungetc but do LineNumber processing 241 */ 242 void 243 unget_char(ch, file) 244 int ch; 245 FILE *file; 246 { 247 ungetc(ch, file); 248 if (ch == '\n') 249 Set_LineNum(LineNumber - 1) 250 } 251 252 253 /* get_string(str, max, file, termstr) : like fgets() but 254 * (1) has terminator string which should include \n 255 * (2) will always leave room for the null 256 * (3) uses get_char() so LineNumber will be accurate 257 * (4) returns EOF or terminating character, whichever 258 */ 259 int 260 get_string(string, size, file, terms) 261 char *string; 262 int size; 263 FILE *file; 264 char *terms; 265 { 266 int ch; 267 268 while (EOF != (ch = get_char(file)) && !strchr(terms, ch)) { 269 if (size > 1) { 270 *string++ = (char) ch; 271 size--; 272 } 273 } 274 275 if (size > 0) 276 *string = '\0'; 277 278 return ch; 279 } 280 281 282 /* skip_comments(file) : read past comment (if any) 283 */ 284 void 285 skip_comments(file) 286 FILE *file; 287 { 288 int ch; 289 290 while (EOF != (ch = get_char(file))) { 291 /* ch is now the first character of a line. 292 */ 293 294 while (ch == ' ' || ch == '\t') 295 ch = get_char(file); 296 297 if (ch == EOF) 298 break; 299 300 /* ch is now the first non-blank character of a line. 301 */ 302 303 if (ch != '\n' && ch != '#') 304 break; 305 306 /* ch must be a newline or comment as first non-blank 307 * character on a line. 308 */ 309 310 while (ch != '\n' && ch != EOF) 311 ch = get_char(file); 312 313 /* ch is now the newline of a line which we're going to 314 * ignore. 315 */ 316 } 317 if (ch != EOF) 318 unget_char(ch, file); 319 } 320 321 322 /* int in_file(char *string, FILE *file) 323 * return TRUE if one of the lines in file matches string exactly, 324 * FALSE otherwise. 325 */ 326 static int 327 in_file(char *string, FILE *file) 328 { 329 char line[MAX_TEMPSTR]; 330 331 rewind(file); 332 while (fgets(line, MAX_TEMPSTR, file)) { 333 if (line[0] != '\0') 334 if (line[strlen(line)-1] == '\n') 335 line[strlen(line)-1] = '\0'; 336 if (0 == strcmp(line, string)) 337 return TRUE; 338 } 339 return FALSE; 340 } 341 342 343 /* int allowed(char *username) 344 * returns TRUE if (ALLOW_FILE exists and user is listed) 345 * or (DENY_FILE exists and user is NOT listed) 346 * or (neither file exists but user=="root" so it's okay) 347 */ 348 int 349 allowed(username) 350 char *username; 351 { 352 FILE *allow, *deny; 353 int isallowed; 354 355 isallowed = FALSE; 356 357 deny = NULL; 358 #if defined(ALLOW_FILE) && defined(DENY_FILE) 359 if ((allow = fopen(ALLOW_FILE, "r")) == NULL && errno != ENOENT) 360 goto out; 361 if ((deny = fopen(DENY_FILE, "r")) == NULL && errno != ENOENT) 362 goto out; 363 Debug(DMISC, ("allow/deny enabled, %d/%d\n", !!allow, !!deny)) 364 #else 365 allow = NULL; 366 #endif 367 368 if (allow) 369 isallowed = in_file(username, allow); 370 else if (deny) 371 isallowed = !in_file(username, deny); 372 else { 373 #if defined(ALLOW_ONLY_ROOT) 374 isallowed = (strcmp(username, ROOT_USER) == 0); 375 #else 376 isallowed = TRUE; 377 #endif 378 } 379 out: if (allow) 380 fclose(allow); 381 if (deny) 382 fclose(deny); 383 return (isallowed); 384 } 385 386 387 void 388 log_it(username, xpid, event, detail) 389 char *username; 390 int xpid; 391 char *event; 392 char *detail; 393 { 394 #if defined(LOG_FILE) || DEBUGGING 395 PID_T pid = xpid; 396 #endif 397 #if defined(LOG_FILE) 398 char *msg; 399 TIME_T now = time((TIME_T) 0); 400 register struct tm *t = localtime(&now); 401 #endif /*LOG_FILE*/ 402 403 #if defined(SYSLOG) 404 static int syslog_open = 0; 405 #endif 406 407 #if defined(LOG_FILE) 408 /* we assume that MAX_TEMPSTR will hold the date, time, &punctuation. 409 */ 410 msg = malloc(strlen(username) 411 + strlen(event) 412 + strlen(detail) 413 + MAX_TEMPSTR); 414 415 if (msg == NULL) 416 warnx("failed to allocate memory for log message"); 417 else { 418 if (LogFD < OK) { 419 LogFD = open(LOG_FILE, O_WRONLY|O_APPEND|O_CREAT, 0600); 420 if (LogFD < OK) { 421 warn("can't open log file %s", LOG_FILE); 422 } else { 423 (void) fcntl(LogFD, F_SETFD, 1); 424 } 425 } 426 427 /* we have to sprintf() it because fprintf() doesn't always 428 * write everything out in one chunk and this has to be 429 * atomically appended to the log file. 430 */ 431 sprintf(msg, "%s (%02d/%02d-%02d:%02d:%02d-%d) %s (%s)\n", 432 username, 433 t->tm_mon+1, t->tm_mday, t->tm_hour, t->tm_min, 434 t->tm_sec, pid, event, detail); 435 436 /* we have to run strlen() because sprintf() returns (char*) 437 * on old BSD. 438 */ 439 if (LogFD < OK || write(LogFD, msg, strlen(msg)) < OK) { 440 if (LogFD >= OK) 441 warn("%s", LOG_FILE); 442 warnx("can't write to log file"); 443 write(STDERR, msg, strlen(msg)); 444 } 445 446 free(msg); 447 } 448 #endif /*LOG_FILE*/ 449 450 #if defined(SYSLOG) 451 if (!syslog_open) { 452 /* we don't use LOG_PID since the pid passed to us by 453 * our client may not be our own. therefore we want to 454 * print the pid ourselves. 455 */ 456 # ifdef LOG_DAEMON 457 openlog(ProgramName, LOG_PID, LOG_CRON); 458 # else 459 openlog(ProgramName, LOG_PID); 460 # endif 461 syslog_open = TRUE; /* assume openlog success */ 462 } 463 464 syslog(LOG_INFO, "(%s) %s (%s)\n", username, event, detail); 465 466 #endif /*SYSLOG*/ 467 468 #if DEBUGGING 469 if (DebugFlags) { 470 fprintf(stderr, "log_it: (%s %d) %s (%s)\n", 471 username, pid, event, detail); 472 } 473 #endif 474 } 475 476 477 void 478 log_close() { 479 if (LogFD != ERR) { 480 close(LogFD); 481 LogFD = ERR; 482 } 483 } 484 485 486 /* two warnings: 487 * (1) this routine is fairly slow 488 * (2) it returns a pointer to static storage 489 */ 490 char * 491 first_word(s, t) 492 register char *s; /* string we want the first word of */ 493 register char *t; /* terminators, implicitly including \0 */ 494 { 495 static char retbuf[2][MAX_TEMPSTR + 1]; /* sure wish C had GC */ 496 static int retsel = 0; 497 register char *rb, *rp; 498 499 /* select a return buffer */ 500 retsel = 1-retsel; 501 rb = &retbuf[retsel][0]; 502 rp = rb; 503 504 /* skip any leading terminators */ 505 while (*s && (NULL != strchr(t, *s))) { 506 s++; 507 } 508 509 /* copy until next terminator or full buffer */ 510 while (*s && (NULL == strchr(t, *s)) && (rp < &rb[MAX_TEMPSTR])) { 511 *rp++ = *s++; 512 } 513 514 /* finish the return-string and return it */ 515 *rp = '\0'; 516 return rb; 517 } 518 519 520 /* warning: 521 * heavily ascii-dependent. 522 */ 523 static void 524 mkprint(register char *dst, register unsigned char *src, register int len) 525 { 526 while (len-- > 0) 527 { 528 register unsigned char ch = *src++; 529 530 if (ch < ' ') { /* control character */ 531 *dst++ = '^'; 532 *dst++ = ch + '@'; 533 } else if (ch < 0177) { /* printable */ 534 *dst++ = ch; 535 } else if (ch == 0177) { /* delete/rubout */ 536 *dst++ = '^'; 537 *dst++ = '?'; 538 } else { /* parity character */ 539 sprintf(dst, "\\%03o", ch); 540 dst += 4; 541 } 542 } 543 *dst = '\0'; 544 } 545 546 547 /* warning: 548 * returns a pointer to malloc'd storage, you must call free yourself. 549 */ 550 char * 551 mkprints(src, len) 552 register unsigned char *src; 553 register unsigned int len; 554 { 555 register char *dst = malloc(len*4 + 1); 556 557 if (dst != NULL) 558 mkprint(dst, src, len); 559 560 return dst; 561 } 562 563 564 #ifdef MAIL_DATE 565 /* Sat, 27 Feb 93 11:44:51 CST 566 * 123456789012345678901234567 567 */ 568 char * 569 arpadate(clock) 570 time_t *clock; 571 { 572 time_t t = clock ?*clock :time(0L); 573 struct tm *tm = localtime(&t); 574 static char ret[32]; /* zone name might be >3 chars */ 575 576 if (tm->tm_year >= 100) 577 tm->tm_year += 1900; 578 579 (void) snprintf(ret, sizeof(ret), "%s, %2d %s %d %02d:%02d:%02d %s", 580 DowNames[tm->tm_wday], 581 tm->tm_mday, 582 MonthNames[tm->tm_mon], 583 tm->tm_year, 584 tm->tm_hour, 585 tm->tm_min, 586 tm->tm_sec, 587 TZONE(*tm)); 588 return ret; 589 } 590 #endif /*MAIL_DATE*/ 591 592 593 #ifdef HAVE_SAVED_UIDS 594 static int save_euid; 595 int swap_uids() { save_euid = geteuid(); return seteuid(getuid()); } 596 int swap_uids_back() { return seteuid(save_euid); } 597 #else /*HAVE_SAVED_UIDS*/ 598 int swap_uids() { return setreuid(geteuid(), getuid()); } 599 int swap_uids_back() { return swap_uids(); } 600 #endif /*HAVE_SAVED_UIDS*/ 601