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
strcmp_until(left,right,until)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
strdtb(s)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
set_debug_flags(flags)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
set_cron_uid()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
set_cron_cwd()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
get_char(file)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
unget_char(ch,file)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
get_string(string,size,file,terms)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
skip_comments(file)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
in_file(char * string,FILE * file)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
allowed(username)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
log_it(username,xpid,event,detail)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
log_close()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 *
first_word(s,t)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
mkprint(register char * dst,register unsigned char * src,register int len)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 *
mkprints(src,len)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 *
arpadate(clock)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;
swap_uids()595 int swap_uids() { save_euid = geteuid(); return seteuid(getuid()); }
swap_uids_back()596 int swap_uids_back() { return seteuid(save_euid); }
597 #else /*HAVE_SAVED_UIDS*/
swap_uids()598 int swap_uids() { return setreuid(geteuid(), getuid()); }
swap_uids_back()599 int swap_uids_back() { return swap_uids(); }
600 #endif /*HAVE_SAVED_UIDS*/
601