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1 | /* |
2 | * Copyright (c) 1983, 1988 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1983, 1988 Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)syslogd.c 5.45 (Berkeley) 3/2/91"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | /* | |
45 | * syslogd -- log system messages | |
46 | * | |
47 | * This program implements a system log. It takes a series of lines. | |
48 | * Each line may have a priority, signified as "<n>" as | |
49 | * the first characters of the line. If this is | |
50 | * not present, a default priority is used. | |
51 | * | |
52 | * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will | |
53 | * cause it to reread its configuration file. | |
54 | * | |
55 | * Defined Constants: | |
56 | * | |
57 | * MAXLINE -- the maximimum line length that can be handled. | |
58 | * DEFUPRI -- the default priority for user messages | |
59 | * DEFSPRI -- the default priority for kernel messages | |
60 | * | |
61 | * Author: Eric Allman | |
62 | * extensive changes by Ralph Campbell | |
63 | * more extensive changes by Eric Allman (again) | |
64 | */ | |
65 | ||
66 | #define MAXLINE 1024 /* maximum line length */ | |
67 | #define MAXSVLINE 120 /* maximum saved line length */ | |
68 | #define DEFUPRI (LOG_USER|LOG_NOTICE) | |
69 | #define DEFSPRI (LOG_KERN|LOG_CRIT) | |
70 | #define TIMERINTVL 30 /* interval for checking flush, mark */ | |
71 | ||
72 | #include <sys/param.h> | |
73 | #include <sys/errno.h> | |
74 | #include <sys/ioctl.h> | |
75 | #include <sys/stat.h> | |
76 | #include <sys/wait.h> | |
77 | #include <sys/socket.h> | |
78 | #include <sys/file.h> | |
79 | #include <sys/msgbuf.h> | |
80 | #include <sys/uio.h> | |
81 | #include <sys/un.h> | |
82 | #include <sys/time.h> | |
83 | #include <sys/resource.h> | |
84 | #include <sys/signal.h> | |
85 | ||
86 | #include <netinet/in.h> | |
87 | #include <netdb.h> | |
88 | ||
89 | #include <utmp.h> | |
90 | #include <setjmp.h> | |
91 | #include <stdio.h> | |
92 | #include <ctype.h> | |
93 | #include <string.h> | |
94 | #include <unistd.h> | |
95 | #include "pathnames.h" | |
96 | ||
97 | #define SYSLOG_NAMES | |
98 | #include <sys/syslog.h> | |
99 | ||
100 | char *LogName = _PATH_LOG; | |
101 | char *ConfFile = _PATH_LOGCONF; | |
102 | char *PidFile = _PATH_LOGPID; | |
103 | char ctty[] = _PATH_CONSOLE; | |
104 | ||
105 | #define FDMASK(fd) (1 << (fd)) | |
106 | ||
107 | #define dprintf if (Debug) printf | |
108 | ||
109 | #define MAXUNAMES 20 /* maximum number of user names */ | |
110 | ||
111 | /* | |
112 | * Flags to logmsg(). | |
113 | */ | |
114 | ||
115 | #define IGN_CONS 0x001 /* don't print on console */ | |
116 | #define SYNC_FILE 0x002 /* do fsync on file after printing */ | |
117 | #define ADDDATE 0x004 /* add a date to the message */ | |
118 | #define MARK 0x008 /* this message is a mark */ | |
119 | ||
120 | /* | |
121 | * This structure represents the files that will have log | |
122 | * copies printed. | |
123 | */ | |
124 | ||
125 | struct filed { | |
126 | struct filed *f_next; /* next in linked list */ | |
127 | short f_type; /* entry type, see below */ | |
128 | short f_file; /* file descriptor */ | |
129 | time_t f_time; /* time this was last written */ | |
130 | u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ | |
131 | union { | |
132 | char f_uname[MAXUNAMES][UT_NAMESIZE+1]; | |
133 | struct { | |
134 | char f_hname[MAXHOSTNAMELEN+1]; | |
135 | struct sockaddr_in f_addr; | |
136 | } f_forw; /* forwarding address */ | |
137 | char f_fname[MAXPATHLEN]; | |
138 | } f_un; | |
139 | char f_prevline[MAXSVLINE]; /* last message logged */ | |
140 | char f_lasttime[16]; /* time of last occurrence */ | |
141 | char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ | |
142 | int f_prevpri; /* pri of f_prevline */ | |
143 | int f_prevlen; /* length of f_prevline */ | |
144 | int f_prevcount; /* repetition cnt of prevline */ | |
145 | int f_repeatcount; /* number of "repeated" msgs */ | |
146 | }; | |
147 | ||
148 | /* | |
149 | * Intervals at which we flush out "message repeated" messages, | |
150 | * in seconds after previous message is logged. After each flush, | |
151 | * we move to the next interval until we reach the largest. | |
152 | */ | |
153 | int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ | |
154 | #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) | |
155 | #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) | |
156 | #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ | |
157 | (f)->f_repeatcount = MAXREPEAT; \ | |
158 | } | |
159 | ||
160 | /* values for f_type */ | |
161 | #define F_UNUSED 0 /* unused entry */ | |
162 | #define F_FILE 1 /* regular file */ | |
163 | #define F_TTY 2 /* terminal */ | |
164 | #define F_CONSOLE 3 /* console terminal */ | |
165 | #define F_FORW 4 /* remote machine */ | |
166 | #define F_USERS 5 /* list of users */ | |
167 | #define F_WALL 6 /* everyone logged on */ | |
168 | ||
169 | char *TypeNames[7] = { | |
170 | "UNUSED", "FILE", "TTY", "CONSOLE", | |
171 | "FORW", "USERS", "WALL" | |
172 | }; | |
173 | ||
174 | struct filed *Files; | |
175 | struct filed consfile; | |
176 | ||
177 | int Debug; /* debug flag */ | |
178 | char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ | |
179 | char *LocalDomain; /* our local domain name */ | |
180 | int InetInuse = 0; /* non-zero if INET sockets are being used */ | |
181 | int finet; /* Internet datagram socket */ | |
182 | int LogPort; /* port number for INET connections */ | |
183 | int Initialized = 0; /* set when we have initialized ourselves */ | |
184 | int MarkInterval = 20 * 60; /* interval between marks in seconds */ | |
185 | int MarkSeq = 0; /* mark sequence number */ | |
186 | ||
187 | extern int errno; | |
188 | extern char *ctime(), *index(), *calloc(); | |
189 | ||
190 | main(argc, argv) | |
191 | int argc; | |
192 | char **argv; | |
193 | { | |
194 | register int i; | |
195 | register char *p; | |
196 | int funix, inetm, fklog, klogm, len; | |
197 | struct sockaddr_un sunx, fromunix; | |
198 | struct sockaddr_in sin, frominet; | |
199 | FILE *fp; | |
200 | int ch; | |
201 | char line[MSG_BSIZE + 1]; | |
202 | extern int optind; | |
203 | extern char *optarg; | |
204 | void die(), domark(), init(), reapchild(); | |
205 | ||
206 | while ((ch = getopt(argc, argv, "df:m:p:")) != EOF) | |
207 | switch((char)ch) { | |
208 | case 'd': /* debug */ | |
209 | Debug++; | |
210 | break; | |
211 | case 'f': /* configuration file */ | |
212 | ConfFile = optarg; | |
213 | break; | |
214 | case 'm': /* mark interval */ | |
215 | MarkInterval = atoi(optarg) * 60; | |
216 | break; | |
217 | case 'p': /* path */ | |
218 | LogName = optarg; | |
219 | break; | |
220 | case '?': | |
221 | default: | |
222 | usage(); | |
223 | } | |
224 | if (argc -= optind) | |
225 | usage(); | |
226 | ||
227 | if (!Debug) | |
228 | daemon(0, 0); | |
229 | else | |
230 | setlinebuf(stdout); | |
231 | ||
232 | consfile.f_type = F_CONSOLE; | |
233 | (void) strcpy(consfile.f_un.f_fname, ctty); | |
234 | (void) gethostname(LocalHostName, sizeof LocalHostName); | |
235 | if (p = index(LocalHostName, '.')) { | |
236 | *p++ = '\0'; | |
237 | LocalDomain = p; | |
238 | } | |
239 | else | |
240 | LocalDomain = ""; | |
241 | (void) signal(SIGTERM, die); | |
242 | (void) signal(SIGINT, Debug ? die : SIG_IGN); | |
243 | (void) signal(SIGQUIT, Debug ? die : SIG_IGN); | |
244 | (void) signal(SIGCHLD, reapchild); | |
245 | (void) signal(SIGALRM, domark); | |
246 | (void) alarm(TIMERINTVL); | |
247 | (void) unlink(LogName); | |
248 | ||
249 | bzero((char *)&sunx, sizeof(sunx)); | |
250 | sunx.sun_family = AF_UNIX; | |
251 | (void) strncpy(sunx.sun_path, LogName, sizeof sunx.sun_path); | |
252 | funix = socket(AF_UNIX, SOCK_DGRAM, 0); | |
253 | if (funix < 0 || bind(funix, (struct sockaddr *) &sunx, | |
254 | sizeof(sunx.sun_family)+sizeof(sunx.sun_len)+ | |
255 | strlen(sunx.sun_path)) < 0 || | |
256 | chmod(LogName, 0666) < 0) { | |
257 | (void) sprintf(line, "cannot create %s", LogName); | |
258 | logerror(line); | |
259 | dprintf("cannot create %s (%d)\n", LogName, errno); | |
260 | die(0); | |
261 | } | |
262 | finet = socket(AF_INET, SOCK_DGRAM, 0); | |
263 | if (finet >= 0) { | |
264 | struct servent *sp; | |
265 | ||
266 | sp = getservbyname("syslog", "udp"); | |
267 | if (sp == NULL) { | |
268 | errno = 0; | |
269 | logerror("syslog/udp: unknown service"); | |
270 | die(0); | |
271 | } | |
272 | sin.sin_family = AF_INET; | |
273 | sin.sin_port = LogPort = sp->s_port; | |
274 | if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { | |
275 | logerror("bind"); | |
276 | if (!Debug) | |
277 | die(0); | |
278 | } else { | |
279 | inetm = FDMASK(finet); | |
280 | InetInuse = 1; | |
281 | } | |
282 | } | |
283 | if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) | |
284 | klogm = FDMASK(fklog); | |
285 | else { | |
286 | dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); | |
287 | klogm = 0; | |
288 | } | |
289 | ||
290 | /* tuck my process id away */ | |
291 | fp = fopen(PidFile, "w"); | |
292 | if (fp != NULL) { | |
293 | fprintf(fp, "%d\n", getpid()); | |
294 | (void) fclose(fp); | |
295 | } | |
296 | ||
297 | dprintf("off & running....\n"); | |
298 | ||
299 | init(); | |
300 | (void) signal(SIGHUP, init); | |
301 | ||
302 | for (;;) { | |
303 | int nfds, readfds = FDMASK(funix) | inetm | klogm; | |
304 | ||
305 | errno = 0; | |
306 | dprintf("readfds = %#x\n", readfds); | |
307 | nfds = select(20, (fd_set *) &readfds, (fd_set *) NULL, | |
308 | (fd_set *) NULL, (struct timeval *) NULL); | |
309 | if (nfds == 0) | |
310 | continue; | |
311 | if (nfds < 0) { | |
312 | if (errno != EINTR) | |
313 | logerror("select"); | |
314 | continue; | |
315 | } | |
316 | dprintf("got a message (%d, %#x)\n", nfds, readfds); | |
317 | if (readfds & klogm) { | |
318 | i = read(fklog, line, sizeof(line) - 1); | |
319 | if (i > 0) { | |
320 | line[i] = '\0'; | |
321 | printsys(line); | |
322 | } else if (i < 0 && errno != EINTR) { | |
323 | logerror("klog"); | |
324 | fklog = -1; | |
325 | klogm = 0; | |
326 | } | |
327 | } | |
328 | if (readfds & FDMASK(funix)) { | |
329 | len = sizeof fromunix; | |
330 | i = recvfrom(funix, line, MAXLINE, 0, | |
331 | (struct sockaddr *) &fromunix, &len); | |
332 | if (i > 0) { | |
333 | line[i] = '\0'; | |
334 | printline(LocalHostName, line); | |
335 | } else if (i < 0 && errno != EINTR) | |
336 | logerror("recvfrom unix"); | |
337 | } | |
338 | if (readfds & inetm) { | |
339 | len = sizeof frominet; | |
340 | i = recvfrom(finet, line, MAXLINE, 0, | |
341 | (struct sockaddr *) &frominet, &len); | |
342 | if (i > 0) { | |
343 | extern char *cvthname(); | |
344 | ||
345 | line[i] = '\0'; | |
346 | printline(cvthname(&frominet), line); | |
347 | } else if (i < 0 && errno != EINTR) | |
348 | logerror("recvfrom inet"); | |
349 | } | |
350 | } | |
351 | } | |
352 | ||
353 | usage() | |
354 | { | |
355 | (void) fprintf(stderr, | |
356 | "usage: syslogd [-f conffile] [-m markinterval] [-p logpath]\n"); | |
357 | exit(1); | |
358 | } | |
359 | ||
360 | /* | |
361 | * Take a raw input line, decode the message, and print the message | |
362 | * on the appropriate log files. | |
363 | */ | |
364 | ||
365 | printline(hname, msg) | |
366 | char *hname; | |
367 | char *msg; | |
368 | { | |
369 | register char *p, *q; | |
370 | register int c; | |
371 | char line[MAXLINE + 1]; | |
372 | int pri; | |
373 | ||
374 | /* test for special codes */ | |
375 | pri = DEFUPRI; | |
376 | p = msg; | |
377 | if (*p == '<') { | |
378 | pri = 0; | |
379 | while (isdigit(*++p)) | |
380 | pri = 10 * pri + (*p - '0'); | |
381 | if (*p == '>') | |
382 | ++p; | |
383 | } | |
384 | if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) | |
385 | pri = DEFUPRI; | |
386 | ||
387 | /* don't allow users to log kernel messages */ | |
388 | if (LOG_FAC(pri) == LOG_KERN) | |
389 | pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); | |
390 | ||
391 | q = line; | |
392 | ||
393 | while ((c = *p++ & 0177) != '\0' && | |
394 | q < &line[sizeof(line) - 1]) | |
395 | if (iscntrl(c)) | |
396 | if (c == '\n') | |
397 | *q++ = ' '; | |
398 | else if (c == '\t') | |
399 | *q++ = '\t'; | |
400 | else { | |
401 | *q++ = '^'; | |
402 | *q++ = c ^ 0100; | |
403 | } | |
404 | else | |
405 | *q++ = c; | |
406 | *q = '\0'; | |
407 | ||
408 | logmsg(pri, line, hname, 0); | |
409 | } | |
410 | ||
411 | /* | |
412 | * Take a raw input line from /dev/klog, split and format similar to syslog(). | |
413 | */ | |
414 | ||
415 | printsys(msg) | |
416 | char *msg; | |
417 | { | |
418 | register char *p, *q; | |
419 | register int c; | |
420 | char line[MAXLINE + 1]; | |
421 | int pri, flags; | |
422 | char *lp; | |
423 | ||
424 | (void) strcpy(line, "vmunix: "); | |
425 | lp = line + strlen(line); | |
426 | for (p = msg; *p != '\0'; ) { | |
427 | flags = SYNC_FILE | ADDDATE; /* fsync file after write */ | |
428 | pri = DEFSPRI; | |
429 | if (*p == '<') { | |
430 | pri = 0; | |
431 | while (isdigit(*++p)) | |
432 | pri = 10 * pri + (*p - '0'); | |
433 | if (*p == '>') | |
434 | ++p; | |
435 | } else { | |
436 | /* kernel printf's come out on console */ | |
437 | flags |= IGN_CONS; | |
438 | } | |
439 | if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) | |
440 | pri = DEFSPRI; | |
441 | q = lp; | |
442 | while (*p != '\0' && (c = *p++) != '\n' && | |
443 | q < &line[MAXLINE]) | |
444 | *q++ = c; | |
445 | *q = '\0'; | |
446 | logmsg(pri, line, LocalHostName, flags); | |
447 | } | |
448 | } | |
449 | ||
450 | time_t now; | |
451 | ||
452 | /* | |
453 | * Log a message to the appropriate log files, users, etc. based on | |
454 | * the priority. | |
455 | */ | |
456 | ||
457 | logmsg(pri, msg, from, flags) | |
458 | int pri; | |
459 | char *msg, *from; | |
460 | int flags; | |
461 | { | |
462 | register struct filed *f; | |
463 | int fac, prilev; | |
464 | int omask, msglen; | |
465 | char *timestamp; | |
466 | time_t time(); | |
467 | ||
468 | dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", | |
469 | pri, flags, from, msg); | |
470 | ||
471 | omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); | |
472 | ||
473 | /* | |
474 | * Check to see if msg looks non-standard. | |
475 | */ | |
476 | msglen = strlen(msg); | |
477 | if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || | |
478 | msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') | |
479 | flags |= ADDDATE; | |
480 | ||
481 | (void) time(&now); | |
482 | if (flags & ADDDATE) | |
483 | timestamp = ctime(&now) + 4; | |
484 | else { | |
485 | timestamp = msg; | |
486 | msg += 16; | |
487 | msglen -= 16; | |
488 | } | |
489 | ||
490 | /* extract facility and priority level */ | |
491 | if (flags & MARK) | |
492 | fac = LOG_NFACILITIES; | |
493 | else | |
494 | fac = LOG_FAC(pri); | |
495 | prilev = LOG_PRI(pri); | |
496 | ||
497 | /* log the message to the particular outputs */ | |
498 | if (!Initialized) { | |
499 | f = &consfile; | |
500 | f->f_file = open(ctty, O_WRONLY, 0); | |
501 | ||
502 | if (f->f_file >= 0) { | |
503 | fprintlog(f, flags, msg); | |
504 | (void) close(f->f_file); | |
505 | } | |
506 | (void) sigsetmask(omask); | |
507 | return; | |
508 | } | |
509 | for (f = Files; f; f = f->f_next) { | |
510 | /* skip messages that are incorrect priority */ | |
511 | if (f->f_pmask[fac] < prilev || | |
512 | f->f_pmask[fac] == INTERNAL_NOPRI) | |
513 | continue; | |
514 | ||
515 | if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) | |
516 | continue; | |
517 | ||
518 | /* don't output marks to recently written files */ | |
519 | if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) | |
520 | continue; | |
521 | ||
522 | /* | |
523 | * suppress duplicate lines to this file | |
524 | */ | |
525 | if ((flags & MARK) == 0 && msglen == f->f_prevlen && | |
526 | !strcmp(msg, f->f_prevline) && | |
527 | !strcmp(from, f->f_prevhost)) { | |
528 | (void) strncpy(f->f_lasttime, timestamp, 15); | |
529 | f->f_prevcount++; | |
530 | dprintf("msg repeated %d times, %ld sec of %d\n", | |
531 | f->f_prevcount, now - f->f_time, | |
532 | repeatinterval[f->f_repeatcount]); | |
533 | /* | |
534 | * If domark would have logged this by now, | |
535 | * flush it now (so we don't hold isolated messages), | |
536 | * but back off so we'll flush less often | |
537 | * in the future. | |
538 | */ | |
539 | if (now > REPEATTIME(f)) { | |
540 | fprintlog(f, flags, (char *)NULL); | |
541 | BACKOFF(f); | |
542 | } | |
543 | } else { | |
544 | /* new line, save it */ | |
545 | if (f->f_prevcount) | |
546 | fprintlog(f, 0, (char *)NULL); | |
547 | f->f_repeatcount = 0; | |
548 | (void) strncpy(f->f_lasttime, timestamp, 15); | |
549 | (void) strncpy(f->f_prevhost, from, | |
550 | sizeof(f->f_prevhost)); | |
551 | if (msglen < MAXSVLINE) { | |
552 | f->f_prevlen = msglen; | |
553 | f->f_prevpri = pri; | |
554 | (void) strcpy(f->f_prevline, msg); | |
555 | fprintlog(f, flags, (char *)NULL); | |
556 | } else { | |
557 | f->f_prevline[0] = 0; | |
558 | f->f_prevlen = 0; | |
559 | fprintlog(f, flags, msg); | |
560 | } | |
561 | } | |
562 | } | |
563 | (void) sigsetmask(omask); | |
564 | } | |
565 | ||
566 | fprintlog(f, flags, msg) | |
567 | register struct filed *f; | |
568 | int flags; | |
569 | char *msg; | |
570 | { | |
571 | struct iovec iov[6]; | |
572 | register struct iovec *v; | |
573 | register int l; | |
574 | char line[MAXLINE + 1], repbuf[80], greetings[200]; | |
575 | ||
576 | v = iov; | |
577 | if (f->f_type == F_WALL) { | |
578 | v->iov_base = greetings; | |
579 | v->iov_len = sprintf(greetings, | |
580 | "\r\n\7Message from syslogd@%s at %.24s ...\r\n", | |
581 | f->f_prevhost, ctime(&now)); | |
582 | v++; | |
583 | v->iov_base = ""; | |
584 | v->iov_len = 0; | |
585 | v++; | |
586 | } else { | |
587 | v->iov_base = f->f_lasttime; | |
588 | v->iov_len = 15; | |
589 | v++; | |
590 | v->iov_base = " "; | |
591 | v->iov_len = 1; | |
592 | v++; | |
593 | } | |
594 | v->iov_base = f->f_prevhost; | |
595 | v->iov_len = strlen(v->iov_base); | |
596 | v++; | |
597 | v->iov_base = " "; | |
598 | v->iov_len = 1; | |
599 | v++; | |
600 | ||
601 | if (msg) { | |
602 | v->iov_base = msg; | |
603 | v->iov_len = strlen(msg); | |
604 | } else if (f->f_prevcount > 1) { | |
605 | v->iov_base = repbuf; | |
606 | v->iov_len = sprintf(repbuf, "last message repeated %d times", | |
607 | f->f_prevcount); | |
608 | } else { | |
609 | v->iov_base = f->f_prevline; | |
610 | v->iov_len = f->f_prevlen; | |
611 | } | |
612 | v++; | |
613 | ||
614 | dprintf("Logging to %s", TypeNames[f->f_type]); | |
615 | f->f_time = now; | |
616 | ||
617 | switch (f->f_type) { | |
618 | case F_UNUSED: | |
619 | dprintf("\n"); | |
620 | break; | |
621 | ||
622 | case F_FORW: | |
623 | dprintf(" %s\n", f->f_un.f_forw.f_hname); | |
624 | l = sprintf(line, "<%d>%.15s %s", f->f_prevpri, | |
625 | iov[0].iov_base, iov[4].iov_base); | |
626 | if (l > MAXLINE) | |
627 | l = MAXLINE; | |
628 | if (sendto(finet, line, l, 0, | |
629 | (struct sockaddr *)&f->f_un.f_forw.f_addr, | |
630 | sizeof f->f_un.f_forw.f_addr) != l) { | |
631 | int e = errno; | |
632 | (void) close(f->f_file); | |
633 | f->f_type = F_UNUSED; | |
634 | errno = e; | |
635 | logerror("sendto"); | |
636 | } | |
637 | break; | |
638 | ||
639 | case F_CONSOLE: | |
640 | if (flags & IGN_CONS) { | |
641 | dprintf(" (ignored)\n"); | |
642 | break; | |
643 | } | |
644 | /* FALLTHROUGH */ | |
645 | ||
646 | case F_TTY: | |
647 | case F_FILE: | |
648 | dprintf(" %s\n", f->f_un.f_fname); | |
649 | if (f->f_type != F_FILE) { | |
650 | v->iov_base = "\r\n"; | |
651 | v->iov_len = 2; | |
652 | } else { | |
653 | v->iov_base = "\n"; | |
654 | v->iov_len = 1; | |
655 | } | |
656 | again: | |
657 | if (writev(f->f_file, iov, 6) < 0) { | |
658 | int e = errno; | |
659 | (void) close(f->f_file); | |
660 | /* | |
661 | * Check for errors on TTY's due to loss of tty | |
662 | */ | |
663 | if ((e == EIO || e == EBADF) && f->f_type != F_FILE) { | |
664 | f->f_file = open(f->f_un.f_fname, | |
665 | O_WRONLY|O_APPEND, 0); | |
666 | if (f->f_file < 0) { | |
667 | f->f_type = F_UNUSED; | |
668 | logerror(f->f_un.f_fname); | |
669 | } else | |
670 | goto again; | |
671 | } else { | |
672 | f->f_type = F_UNUSED; | |
673 | errno = e; | |
674 | logerror(f->f_un.f_fname); | |
675 | } | |
676 | } else if (flags & SYNC_FILE) | |
677 | (void) fsync(f->f_file); | |
678 | break; | |
679 | ||
680 | case F_USERS: | |
681 | case F_WALL: | |
682 | dprintf("\n"); | |
683 | v->iov_base = "\r\n"; | |
684 | v->iov_len = 2; | |
685 | wallmsg(f, iov); | |
686 | break; | |
687 | } | |
688 | f->f_prevcount = 0; | |
689 | } | |
690 | ||
691 | /* | |
692 | * WALLMSG -- Write a message to the world at large | |
693 | * | |
694 | * Write the specified message to either the entire | |
695 | * world, or a list of approved users. | |
696 | */ | |
697 | ||
698 | wallmsg(f, iov) | |
699 | register struct filed *f; | |
700 | struct iovec *iov; | |
701 | { | |
702 | static int reenter; /* avoid calling ourselves */ | |
703 | register FILE *uf; | |
704 | register int i; | |
705 | struct utmp ut; | |
706 | char *p, *ttymsg(); | |
707 | ||
708 | if (reenter++) | |
709 | return; | |
710 | if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { | |
711 | logerror(_PATH_UTMP); | |
712 | reenter = 0; | |
713 | return; | |
714 | } | |
715 | /* NOSTRICT */ | |
716 | while (fread((char *) &ut, sizeof ut, 1, uf) == 1) { | |
717 | if (ut.ut_name[0] == '\0') | |
718 | continue; | |
719 | if (f->f_type == F_WALL) { | |
720 | if (p = ttymsg(iov, 6, ut.ut_line, 1)) { | |
721 | errno = 0; /* already in msg */ | |
722 | logerror(p); | |
723 | } | |
724 | continue; | |
725 | } | |
726 | /* should we send the message to this user? */ | |
727 | for (i = 0; i < MAXUNAMES; i++) { | |
728 | if (!f->f_un.f_uname[i][0]) | |
729 | break; | |
730 | if (!strncmp(f->f_un.f_uname[i], ut.ut_name, | |
731 | UT_NAMESIZE)) { | |
732 | if (p = ttymsg(iov, 6, ut.ut_line, 1)) { | |
733 | errno = 0; /* already in msg */ | |
734 | logerror(p); | |
735 | } | |
736 | break; | |
737 | } | |
738 | } | |
739 | } | |
740 | (void) fclose(uf); | |
741 | reenter = 0; | |
742 | } | |
743 | ||
744 | void | |
745 | reapchild() | |
746 | { | |
747 | union wait status; | |
748 | ||
749 | while (wait3((int *)&status, WNOHANG, (struct rusage *) NULL) > 0) | |
750 | ; | |
751 | } | |
752 | ||
753 | /* | |
754 | * Return a printable representation of a host address. | |
755 | */ | |
756 | char * | |
757 | cvthname(f) | |
758 | struct sockaddr_in *f; | |
759 | { | |
760 | struct hostent *hp; | |
761 | register char *p; | |
762 | extern char *inet_ntoa(); | |
763 | ||
764 | dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); | |
765 | ||
766 | if (f->sin_family != AF_INET) { | |
767 | dprintf("Malformed from address\n"); | |
768 | return ("???"); | |
769 | } | |
770 | hp = gethostbyaddr((char *)&f->sin_addr, | |
771 | sizeof(struct in_addr), f->sin_family); | |
772 | if (hp == 0) { | |
773 | dprintf("Host name for your address (%s) unknown\n", | |
774 | inet_ntoa(f->sin_addr)); | |
775 | return (inet_ntoa(f->sin_addr)); | |
776 | } | |
777 | if ((p = index(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) | |
778 | *p = '\0'; | |
779 | return (hp->h_name); | |
780 | } | |
781 | ||
782 | void | |
783 | domark() | |
784 | { | |
785 | register struct filed *f; | |
786 | time_t time(); | |
787 | ||
788 | now = time((time_t *)NULL); | |
789 | MarkSeq += TIMERINTVL; | |
790 | if (MarkSeq >= MarkInterval) { | |
791 | logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); | |
792 | MarkSeq = 0; | |
793 | } | |
794 | ||
795 | for (f = Files; f; f = f->f_next) { | |
796 | if (f->f_prevcount && now >= REPEATTIME(f)) { | |
797 | dprintf("flush %s: repeated %d times, %d sec.\n", | |
798 | TypeNames[f->f_type], f->f_prevcount, | |
799 | repeatinterval[f->f_repeatcount]); | |
800 | fprintlog(f, 0, (char *)NULL); | |
801 | BACKOFF(f); | |
802 | } | |
803 | } | |
804 | (void) alarm(TIMERINTVL); | |
805 | } | |
806 | ||
807 | /* | |
808 | * Print syslogd errors some place. | |
809 | */ | |
810 | logerror(type) | |
811 | char *type; | |
812 | { | |
813 | char buf[100], *strerror(); | |
814 | ||
815 | if (errno) | |
816 | (void) sprintf(buf, "syslogd: %s: %s", type, strerror(errno)); | |
817 | else | |
818 | (void) sprintf(buf, "syslogd: %s", type); | |
819 | errno = 0; | |
820 | dprintf("%s\n", buf); | |
821 | logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); | |
822 | } | |
823 | ||
824 | void | |
825 | die(sig) | |
826 | { | |
827 | register struct filed *f; | |
828 | char buf[100]; | |
829 | ||
830 | for (f = Files; f != NULL; f = f->f_next) { | |
831 | /* flush any pending output */ | |
832 | if (f->f_prevcount) | |
833 | fprintlog(f, 0, (char *)NULL); | |
834 | } | |
835 | if (sig) { | |
836 | dprintf("syslogd: exiting on signal %d\n", sig); | |
837 | (void) sprintf(buf, "exiting on signal %d", sig); | |
838 | errno = 0; | |
839 | logerror(buf); | |
840 | } | |
841 | (void) unlink(LogName); | |
842 | exit(0); | |
843 | } | |
844 | ||
845 | /* | |
846 | * INIT -- Initialize syslogd from configuration table | |
847 | */ | |
848 | ||
849 | void | |
850 | init() | |
851 | { | |
852 | register int i; | |
853 | register FILE *cf; | |
854 | register struct filed *f, *next, **nextp; | |
855 | register char *p; | |
856 | char cline[BUFSIZ]; | |
857 | ||
858 | dprintf("init\n"); | |
859 | ||
860 | /* | |
861 | * Close all open log files. | |
862 | */ | |
863 | Initialized = 0; | |
864 | for (f = Files; f != NULL; f = next) { | |
865 | /* flush any pending output */ | |
866 | if (f->f_prevcount) | |
867 | fprintlog(f, 0, (char *)NULL); | |
868 | ||
869 | switch (f->f_type) { | |
870 | case F_FILE: | |
871 | case F_TTY: | |
872 | case F_CONSOLE: | |
873 | case F_FORW: | |
874 | (void) close(f->f_file); | |
875 | break; | |
876 | } | |
877 | next = f->f_next; | |
878 | free((char *) f); | |
879 | } | |
880 | Files = NULL; | |
881 | nextp = &Files; | |
882 | ||
883 | /* open the configuration file */ | |
884 | if ((cf = fopen(ConfFile, "r")) == NULL) { | |
885 | dprintf("cannot open %s\n", ConfFile); | |
886 | *nextp = (struct filed *)calloc(1, sizeof(*f)); | |
887 | cfline("*.ERR\t/dev/console", *nextp); | |
888 | (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); | |
889 | cfline("*.PANIC\t*", (*nextp)->f_next); | |
890 | Initialized = 1; | |
891 | return; | |
892 | } | |
893 | ||
894 | /* | |
895 | * Foreach line in the conf table, open that file. | |
896 | */ | |
897 | f = NULL; | |
898 | while (fgets(cline, sizeof cline, cf) != NULL) { | |
899 | /* | |
900 | * check for end-of-section, comments, strip off trailing | |
901 | * spaces and newline character. | |
902 | */ | |
903 | for (p = cline; isspace(*p); ++p); | |
904 | if (*p == NULL || *p == '#') | |
905 | continue; | |
906 | for (p = index(cline, '\0'); isspace(*--p);); | |
907 | *++p = '\0'; | |
908 | f = (struct filed *)calloc(1, sizeof(*f)); | |
909 | *nextp = f; | |
910 | nextp = &f->f_next; | |
911 | cfline(cline, f); | |
912 | } | |
913 | ||
914 | /* close the configuration file */ | |
915 | (void) fclose(cf); | |
916 | ||
917 | Initialized = 1; | |
918 | ||
919 | if (Debug) { | |
920 | for (f = Files; f; f = f->f_next) { | |
921 | for (i = 0; i <= LOG_NFACILITIES; i++) | |
922 | if (f->f_pmask[i] == INTERNAL_NOPRI) | |
923 | printf("X "); | |
924 | else | |
925 | printf("%d ", f->f_pmask[i]); | |
926 | printf("%s: ", TypeNames[f->f_type]); | |
927 | switch (f->f_type) { | |
928 | case F_FILE: | |
929 | case F_TTY: | |
930 | case F_CONSOLE: | |
931 | printf("%s", f->f_un.f_fname); | |
932 | break; | |
933 | ||
934 | case F_FORW: | |
935 | printf("%s", f->f_un.f_forw.f_hname); | |
936 | break; | |
937 | ||
938 | case F_USERS: | |
939 | for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) | |
940 | printf("%s, ", f->f_un.f_uname[i]); | |
941 | break; | |
942 | } | |
943 | printf("\n"); | |
944 | } | |
945 | } | |
946 | ||
947 | logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); | |
948 | dprintf("syslogd: restarted\n"); | |
949 | } | |
950 | ||
951 | /* | |
952 | * Crack a configuration file line | |
953 | */ | |
954 | ||
955 | cfline(line, f) | |
956 | char *line; | |
957 | register struct filed *f; | |
958 | { | |
959 | register char *p; | |
960 | register char *q; | |
961 | register int i; | |
962 | char *bp; | |
963 | int pri; | |
964 | struct hostent *hp; | |
965 | char buf[MAXLINE], ebuf[100]; | |
966 | ||
967 | dprintf("cfline(%s)\n", line); | |
968 | ||
969 | errno = 0; /* keep strerror() stuff out of logerror messages */ | |
970 | ||
971 | /* clear out file entry */ | |
972 | bzero((char *) f, sizeof *f); | |
973 | for (i = 0; i <= LOG_NFACILITIES; i++) | |
974 | f->f_pmask[i] = INTERNAL_NOPRI; | |
975 | ||
976 | /* scan through the list of selectors */ | |
977 | for (p = line; *p && *p != '\t';) { | |
978 | ||
979 | /* find the end of this facility name list */ | |
980 | for (q = p; *q && *q != '\t' && *q++ != '.'; ) | |
981 | continue; | |
982 | ||
983 | /* collect priority name */ | |
984 | for (bp = buf; *q && !index("\t,;", *q); ) | |
985 | *bp++ = *q++; | |
986 | *bp = '\0'; | |
987 | ||
988 | /* skip cruft */ | |
989 | while (index(", ;", *q)) | |
990 | q++; | |
991 | ||
992 | /* decode priority name */ | |
993 | if (*buf == '*') | |
994 | pri = LOG_PRIMASK + 1; | |
995 | else { | |
996 | pri = decode(buf, prioritynames); | |
997 | if (pri < 0) { | |
998 | (void) sprintf(ebuf, | |
999 | "unknown priority name \"%s\"", buf); | |
1000 | logerror(ebuf); | |
1001 | return; | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | /* scan facilities */ | |
1006 | while (*p && !index("\t.;", *p)) { | |
1007 | for (bp = buf; *p && !index("\t,;.", *p); ) | |
1008 | *bp++ = *p++; | |
1009 | *bp = '\0'; | |
1010 | if (*buf == '*') | |
1011 | for (i = 0; i < LOG_NFACILITIES; i++) | |
1012 | f->f_pmask[i] = pri; | |
1013 | else { | |
1014 | i = decode(buf, facilitynames); | |
1015 | if (i < 0) { | |
1016 | (void) sprintf(ebuf, | |
1017 | "unknown facility name \"%s\"", | |
1018 | buf); | |
1019 | logerror(ebuf); | |
1020 | return; | |
1021 | } | |
1022 | f->f_pmask[i >> 3] = pri; | |
1023 | } | |
1024 | while (*p == ',' || *p == ' ') | |
1025 | p++; | |
1026 | } | |
1027 | ||
1028 | p = q; | |
1029 | } | |
1030 | ||
1031 | /* skip to action part */ | |
1032 | while (*p == '\t') | |
1033 | p++; | |
1034 | ||
1035 | switch (*p) | |
1036 | { | |
1037 | case '@': | |
1038 | if (!InetInuse) | |
1039 | break; | |
1040 | (void) strcpy(f->f_un.f_forw.f_hname, ++p); | |
1041 | hp = gethostbyname(p); | |
1042 | if (hp == NULL) { | |
1043 | extern int h_errno, h_nerr; | |
1044 | extern char **h_errlist; | |
1045 | ||
1046 | logerror((u_int)h_errno < h_nerr ? | |
1047 | h_errlist[h_errno] : "Unknown error"); | |
1048 | break; | |
1049 | } | |
1050 | bzero((char *) &f->f_un.f_forw.f_addr, | |
1051 | sizeof f->f_un.f_forw.f_addr); | |
1052 | f->f_un.f_forw.f_addr.sin_family = AF_INET; | |
1053 | f->f_un.f_forw.f_addr.sin_port = LogPort; | |
1054 | bcopy(hp->h_addr, (char *) &f->f_un.f_forw.f_addr.sin_addr, hp->h_length); | |
1055 | f->f_type = F_FORW; | |
1056 | break; | |
1057 | ||
1058 | case '/': | |
1059 | (void) strcpy(f->f_un.f_fname, p); | |
1060 | if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { | |
1061 | f->f_file = F_UNUSED; | |
1062 | logerror(p); | |
1063 | break; | |
1064 | } | |
1065 | if (isatty(f->f_file)) | |
1066 | f->f_type = F_TTY; | |
1067 | else | |
1068 | f->f_type = F_FILE; | |
1069 | if (strcmp(p, ctty) == 0) | |
1070 | f->f_type = F_CONSOLE; | |
1071 | break; | |
1072 | ||
1073 | case '*': | |
1074 | f->f_type = F_WALL; | |
1075 | break; | |
1076 | ||
1077 | default: | |
1078 | for (i = 0; i < MAXUNAMES && *p; i++) { | |
1079 | for (q = p; *q && *q != ','; ) | |
1080 | q++; | |
1081 | (void) strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); | |
1082 | if ((q - p) > UT_NAMESIZE) | |
1083 | f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; | |
1084 | else | |
1085 | f->f_un.f_uname[i][q - p] = '\0'; | |
1086 | while (*q == ',' || *q == ' ') | |
1087 | q++; | |
1088 | p = q; | |
1089 | } | |
1090 | f->f_type = F_USERS; | |
1091 | break; | |
1092 | } | |
1093 | } | |
1094 | ||
1095 | ||
1096 | /* | |
1097 | * Decode a symbolic name to a numeric value | |
1098 | */ | |
1099 | ||
1100 | decode(name, codetab) | |
1101 | char *name; | |
1102 | CODE *codetab; | |
1103 | { | |
1104 | register CODE *c; | |
1105 | register char *p; | |
1106 | char buf[40]; | |
1107 | ||
1108 | if (isdigit(*name)) | |
1109 | return (atoi(name)); | |
1110 | ||
1111 | (void) strcpy(buf, name); | |
1112 | for (p = buf; *p; p++) | |
1113 | if (isupper(*p)) | |
1114 | *p = tolower(*p); | |
1115 | for (c = codetab; c->c_name; c++) | |
1116 | if (!strcmp(buf, c->c_name)) | |
1117 | return (c->c_val); | |
1118 | ||
1119 | return (-1); | |
1120 | } |