1 /* Copyright 1988,1990,1993,1994 by Paul Vixie
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
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
18 #if !defined(lint) && !defined(LINT)
19 static const char rcsid[] =
23 /* vix 26jan87 [RCS has the rest of the log]
24 * vix 30dec86 [written]
30 # include <sys/time.h>
45 #if defined(LOG_DAEMON) && !defined(LOG_CRON)
46 #define LOG_CRON LOG_DAEMON
50 static int LogFD = ERR;
54 strcmp_until(left, right, until)
61 while (*left && *left != until && *left == *right) {
66 if ((*left=='\0' || *left == until) &&
67 (*right=='\0' || *right == until)) {
70 diff = *left - *right;
77 /* strdtb(s) - delete trailing blanks in string 's' and return new length
85 /* scan forward to the null
90 /* scan backward to either the first character before the string,
91 * or the last non-blank in the string, whichever comes first.
94 while (x >= s && isspace(*x));
96 /* one character beyond where we stopped above is where the null
101 /* the difference between the position of the null character and
102 * the position of the first character of the string is the length.
109 set_debug_flags(flags)
112 /* debug flags are of the form flag[,flag ...]
114 * if an error occurs, print a message to stdout and return FALSE.
115 * otherwise return TRUE after setting ERROR_FLAGS.
120 printf("this program was compiled without debugging enabled\n");
123 #else /* DEBUGGING */
133 /* try to find debug flag name in our list.
135 for ( test = DebugFlagNames, mask = 1;
136 *test && strcmp_until(*test, pc, ',');
143 "unrecognized debug flag <%s> <%s>\n",
150 /* skip to the next flag
152 while (*pc && *pc != ',')
161 fprintf(stderr, "debug flags enabled:");
163 for (flag = 0; DebugFlagNames[flag]; flag++)
164 if (DebugFlags & (1 << flag))
165 fprintf(stderr, " %s", DebugFlagNames[flag]);
166 fprintf(stderr, "\n");
171 #endif /* DEBUGGING */
178 #if defined(BSD) || defined(POSIX)
179 if (seteuid(ROOT_UID) < OK)
180 err(ERROR_EXIT, "seteuid");
182 if (setuid(ROOT_UID) < OK)
183 err(ERROR_EXIT, "setuid");
193 /* first check for CRONDIR ("/var/cron" or some such)
195 if (stat(CRONDIR, &sb) < OK && errno == ENOENT) {
197 if (OK == mkdir(CRONDIR, 0700)) {
198 warnx("%s: created", CRONDIR);
201 err(ERROR_EXIT, "%s: mkdir", CRONDIR);
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);
209 /* CRONDIR okay (now==CWD), now look at SPOOL_DIR ("tabs" or some such)
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);
217 err(ERROR_EXIT, "%s: mkdir", SPOOL_DIR);
220 if (!(sb.st_mode & S_IFDIR))
221 err(ERROR_EXIT, "'%s' is not a directory, bailing out", SPOOL_DIR);
225 /* get_char(file) : like getc() but increment LineNumber on newlines
235 Set_LineNum(LineNumber + 1)
240 /* unget_char(ch, file) : like ungetc but do LineNumber processing
249 Set_LineNum(LineNumber - 1)
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
260 get_string(string, size, file, terms)
268 while (EOF != (ch = get_char(file)) && !strchr(terms, ch)) {
270 *string++ = (char) ch;
282 /* skip_comments(file) : read past comment (if any)
290 while (EOF != (ch = get_char(file))) {
291 /* ch is now the first character of a line.
294 while (ch == ' ' || ch == '\t')
300 /* ch is now the first non-blank character of a line.
303 if (ch != '\n' && ch != '#')
306 /* ch must be a newline or comment as first non-blank
307 * character on a line.
310 while (ch != '\n' && ch != EOF)
313 /* ch is now the newline of a line which we're going to
318 unget_char(ch, file);
322 /* int in_file(char *string, FILE *file)
323 * return TRUE if one of the lines in file matches string exactly,
327 in_file(char *string, FILE *file)
329 char line[MAX_TEMPSTR];
332 while (fgets(line, MAX_TEMPSTR, file)) {
334 if (line[strlen(line)-1] == '\n')
335 line[strlen(line)-1] = '\0';
336 if (0 == strcmp(line, string))
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)
358 #if defined(ALLOW_FILE) && defined(DENY_FILE)
359 if ((allow = fopen(ALLOW_FILE, "r")) == NULL && errno != ENOENT)
361 if ((deny = fopen(DENY_FILE, "r")) == NULL && errno != ENOENT)
363 Debug(DMISC, ("allow/deny enabled, %d/%d\n", !!allow, !!deny))
369 isallowed = in_file(username, allow);
371 isallowed = !in_file(username, deny);
373 #if defined(ALLOW_ONLY_ROOT)
374 isallowed = (strcmp(username, ROOT_USER) == 0);
388 log_it(username, xpid, event, detail)
394 #if defined(LOG_FILE) || DEBUGGING
397 #if defined(LOG_FILE)
399 TIME_T now = time((TIME_T) 0);
400 register struct tm *t = localtime(&now);
404 static int syslog_open = 0;
407 #if defined(LOG_FILE)
408 /* we assume that MAX_TEMPSTR will hold the date, time, &punctuation.
410 msg = malloc(strlen(username)
416 warnx("failed to allocate memory for log message");
419 LogFD = open(LOG_FILE, O_WRONLY|O_APPEND|O_CREAT, 0600);
421 warn("can't open log file %s", LOG_FILE);
423 (void) fcntl(LogFD, F_SETFD, 1);
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.
431 sprintf(msg, "%s (%02d/%02d-%02d:%02d:%02d-%d) %s (%s)\n",
433 t->tm_mon+1, t->tm_mday, t->tm_hour, t->tm_min,
434 t->tm_sec, pid, event, detail);
436 /* we have to run strlen() because sprintf() returns (char*)
439 if (LogFD < OK || write(LogFD, msg, strlen(msg)) < OK) {
441 warn("%s", LOG_FILE);
442 warnx("can't write to log file");
443 write(STDERR, msg, strlen(msg));
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.
457 openlog(ProgramName, LOG_PID, LOG_CRON);
459 openlog(ProgramName, LOG_PID);
461 syslog_open = TRUE; /* assume openlog success */
464 syslog(LOG_INFO, "(%s) %s (%s)\n", username, event, detail);
470 fprintf(stderr, "log_it: (%s %d) %s (%s)\n",
471 username, pid, event, detail);
487 * (1) this routine is fairly slow
488 * (2) it returns a pointer to static storage
492 register char *s; /* string we want the first word of */
493 register char *t; /* terminators, implicitly including \0 */
495 static char retbuf[2][MAX_TEMPSTR + 1]; /* sure wish C had GC */
496 static int retsel = 0;
497 register char *rb, *rp;
499 /* select a return buffer */
501 rb = &retbuf[retsel][0];
504 /* skip any leading terminators */
505 while (*s && (NULL != strchr(t, *s))) {
509 /* copy until next terminator or full buffer */
510 while (*s && (NULL == strchr(t, *s)) && (rp < &rb[MAX_TEMPSTR])) {
514 /* finish the return-string and return it */
521 * heavily ascii-dependent.
524 mkprint(register char *dst, register unsigned char *src, register int len)
528 register unsigned char ch = *src++;
530 if (ch < ' ') { /* control character */
533 } else if (ch < 0177) { /* printable */
535 } else if (ch == 0177) { /* delete/rubout */
538 } else { /* parity character */
539 sprintf(dst, "\\%03o", ch);
548 * returns a pointer to malloc'd storage, you must call free yourself.
552 register unsigned char *src;
553 register unsigned int len;
555 register char *dst = malloc(len*4 + 1);
558 mkprint(dst, src, len);
565 /* Sat, 27 Feb 93 11:44:51 CST
566 * 123456789012345678901234567
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 */
576 if (tm->tm_year >= 100)
579 (void) snprintf(ret, sizeof(ret), "%s, %2d %s %d %02d:%02d:%02d %s",
580 DowNames[tm->tm_wday],
582 MonthNames[tm->tm_mon],
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*/