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bridge(4): document net.link.bridge.pfil_onlyip
[dragonfly.git] / usr.sbin / syslogd / syslogd.c
blob5e66ed8b485a833e5d90acf6988d6f79ccb80947
1 /*
2 * Copyright (c) 1983, 1988, 1993, 1994
3 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)syslogd.c 8.3 (Berkeley) 4/4/94
30 * $FreeBSD: head/usr.sbin/syslogd/syslogd.c 258077 2013-11-13 01:04:02Z ian $
31 */
32
33 /*
34 * syslogd -- log system messages
35 *
36 * This program implements a system log. It takes a series of lines.
37 * Each line may have a priority, signified as "<n>" as
38 * the first characters of the line. If this is
39 * not present, a default priority is used.
40 *
41 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will
42 * cause it to reread its configuration file.
43 *
44 * Defined Constants:
45 *
46 * MAXLINE -- the maximum line length that can be handled.
47 * DEFUPRI -- the default priority for user messages
48 * DEFSPRI -- the default priority for kernel messages
49 *
50 * Author: Eric Allman
51 * extensive changes by Ralph Campbell
52 * more extensive changes by Eric Allman (again)
53 * Extension to log by program name as well as facility and priority
54 * by Peter da Silva.
55 * -u and -v by Harlan Stenn.
56 * Priority comparison code by Harlan Stenn.
57 */
58
59 #define MAXLINE 1024 /* maximum line length */
60 #define MAXSVLINE 120 /* maximum saved line length */
61 #define DEFUPRI (LOG_USER|LOG_NOTICE)
62 #define DEFSPRI (LOG_KERN|LOG_CRIT)
63 #define TIMERINTVL 30 /* interval for checking flush, mark */
64 #define TTYMSGTIME 1 /* timeout passed to ttymsg */
65 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */
66
67 #include <sys/param.h>
68 #include <sys/ioctl.h>
69 #include <sys/mman.h>
70 #include <sys/stat.h>
71 #include <sys/wait.h>
72 #include <sys/socket.h>
73 #include <sys/queue.h>
74 #include <sys/uio.h>
75 #include <sys/un.h>
76 #include <sys/time.h>
77 #include <sys/resource.h>
78 #include <sys/syslimits.h>
79 #include <sys/types.h>
80
81 #include <netinet/in.h>
82 #include <netdb.h>
83 #include <arpa/inet.h>
84
85 #include <ctype.h>
86 #include <err.h>
87 #include <errno.h>
88 #include <fcntl.h>
89 #include <libutil.h>
90 #include <limits.h>
91 #include <paths.h>
92 #include <signal.h>
93 #include <stdio.h>
94 #include <stdlib.h>
95 #include <string.h>
96 #include <sysexits.h>
97 #include <unistd.h>
98 #include <utmpx.h>
99
100 #include "pathnames.h"
101 #include "ttymsg.h"
102
103 #define SYSLOG_NAMES
104 #include <sys/syslog.h>
105
106 const char *ConfFile = _PATH_LOGCONF;
107 const char *PidFile = _PATH_LOGPID;
108 const char ctty[] = _PATH_CONSOLE;
109
110 #define dprintf if (Debug) printf
111
112 #define MAXUNAMES 20 /* maximum number of user names */
113
114 /*
115 * Unix sockets.
116 * We have two default sockets, one with 666 permissions,
117 * and one for privileged programs.
118 */
119 struct funix {
120 int s;
121 const char *name;
122 mode_t mode;
123 STAILQ_ENTRY(funix) next;
124 };
125 struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
126 { NULL } };
127 struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE,
128 { &funix_secure } };
129
130 STAILQ_HEAD(, funix) funixes = { &funix_default,
131 &(funix_secure.next.stqe_next) };
132
133 /*
134 * Flags to logmsg().
135 */
136
137 #define IGN_CONS 0x001 /* don't print on console */
138 #define SYNC_FILE 0x002 /* do fsync on file after printing */
139 #define ADDDATE 0x004 /* add a date to the message */
140 #define MARK 0x008 /* this message is a mark */
141 #define ISKERNEL 0x010 /* kernel generated message */
142
143 /*
144 * This structure represents the files that will have log
145 * copies printed.
146 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
147 * or if f_type if F_PIPE and f_pid > 0.
148 */
149
150 struct filed {
151 struct filed *f_next; /* next in linked list */
152 short f_type; /* entry type, see below */
153 short f_file; /* file descriptor */
154 time_t f_time; /* time this was last written */
155 char *f_host; /* host from which to recd. */
156 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */
157 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */
158 #define PRI_LT 0x1
159 #define PRI_EQ 0x2
160 #define PRI_GT 0x4
161 char *f_program; /* program this applies to */
162 union {
163 char f_uname[MAXUNAMES][MAXLOGNAME];
164 struct {
165 char f_hname[MAXHOSTNAMELEN];
166 struct addrinfo *f_addr;
167
168 } f_forw; /* forwarding address */
169 char f_fname[MAXPATHLEN];
170 struct {
171 char f_pname[MAXPATHLEN];
172 pid_t f_pid;
173 } f_pipe;
174 } f_un;
175 char f_prevline[MAXSVLINE]; /* last message logged */
176 char f_lasttime[16]; /* time of last occurrence */
177 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */
178 int f_prevpri; /* pri of f_prevline */
179 int f_prevlen; /* length of f_prevline */
180 int f_prevcount; /* repetition cnt of prevline */
181 u_int f_repeatcount; /* number of "repeated" msgs */
182 int f_flags; /* file-specific flags */
183 #define FFLAG_SYNC 0x01
184 #define FFLAG_NEEDSYNC 0x02
185 };
186
187 /*
188 * Queue of about-to-be dead processes we should watch out for.
189 */
190
191 TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
192 struct stailhead *deadq_headp;
193
194 struct deadq_entry {
195 pid_t dq_pid;
196 int dq_timeout;
197 TAILQ_ENTRY(deadq_entry) dq_entries;
198 };
199
200 /*
201 * The timeout to apply to processes waiting on the dead queue. Unit
202 * of measure is `mark intervals', i.e. 20 minutes by default.
203 * Processes on the dead queue will be terminated after that time.
204 */
205
206 #define DQ_TIMO_INIT 2
207
208 typedef struct deadq_entry *dq_t;
209
210
211 /*
212 * Struct to hold records of network addresses that are allowed to log
213 * to us.
214 */
215 struct allowedpeer {
216 int isnumeric;
217 u_short port;
218 union {
219 struct {
220 struct sockaddr_storage addr;
221 struct sockaddr_storage mask;
222 } numeric;
223 char *name;
224 } u;
225 #define a_addr u.numeric.addr
226 #define a_mask u.numeric.mask
227 #define a_name u.name
228 };
229
230
231 /*
232 * Intervals at which we flush out "message repeated" messages,
233 * in seconds after previous message is logged. After each flush,
234 * we move to the next interval until we reach the largest.
235 */
236 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */
237 #define MAXREPEAT (NELEM(repeatinterval) - 1)
238 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount])
239 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \
240 (f)->f_repeatcount = MAXREPEAT; \
241 }
242
243 /* values for f_type */
244 #define F_UNUSED 0 /* unused entry */
245 #define F_FILE 1 /* regular file */
246 #define F_TTY 2 /* terminal */
247 #define F_CONSOLE 3 /* console terminal */
248 #define F_FORW 4 /* remote machine */
249 #define F_USERS 5 /* list of users */
250 #define F_WALL 6 /* everyone logged on */
251 #define F_PIPE 7 /* pipe to program */
252
253 const char *TypeNames[8] = {
254 "UNUSED", "FILE", "TTY", "CONSOLE",
255 "FORW", "USERS", "WALL", "PIPE"
256 };
257
258 static struct filed *Files; /* Log files that we write to */
259 static struct filed consfile; /* Console */
260
261 static int Debug; /* debug flag */
262 static int resolve = 1; /* resolve hostname */
263 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */
264 static const char *LocalDomain; /* our local domain name */
265 static int *finet; /* Internet datagram socket */
266 static int fklog = -1; /* /dev/klog */
267 static int Initialized; /* set when we have initialized ourselves */
268 static int MarkInterval = 20 * 60; /* interval between marks in seconds */
269 static int MarkSeq; /* mark sequence number */
270 static int NoBind; /* don't bind() as suggested by RFC 3164 */
271 static int SecureMode; /* when true, receive only unix domain socks */
272 #ifdef INET6
273 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
274 #else
275 static int family = PF_INET; /* protocol family (IPv4 only) */
276 #endif
277 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */
278 static int send_to_all; /* send message to all IPv4/IPv6 addresses */
279 static int use_bootfile; /* log entire bootfile for every kern msg */
280 static int no_compress; /* don't compress messages (1=pipes, 2=all) */
281 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
282
283 static char bootfile[MAXLINE+1]; /* booted kernel file */
284
285 struct allowedpeer *AllowedPeers; /* List of allowed peers */
286 static int NumAllowed; /* Number of entries in AllowedPeers */
287 static int RemoteAddDate; /* Always set the date on remote messages */
288
289 static int UniquePriority; /* Only log specified priority? */
290 static int LogFacPri; /* Put facility and priority in log message: */
291 /* 0=no, 1=numeric, 2=names */
292 static int KeepKernFac; /* Keep remotely logged kernel facility */
293 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
294 static struct pidfh *pfh;
295
296 volatile sig_atomic_t MarkSet, WantDie;
297
298 static int allowaddr(char *);
299 static void cfline(const char *, struct filed *,
300 const char *, const char *);
301 static const char *cvthname(struct sockaddr *);
302 static void deadq_enter(pid_t, const char *);
303 static int deadq_remove(pid_t);
304 static int decode(const char *, const CODE *);
305 static void die(int);
306 static void dodie(int);
307 static void dofsync(void);
308 static void domark(int);
309 static void fprintlog(struct filed *, int, const char *);
310 static int *socksetup(int, char *);
311 static void init(int);
312 static void logerror(const char *);
313 static void logmsg(int, const char *, const char *, int);
314 static void log_deadchild(pid_t, int, const char *);
315 static void markit(void);
316 static int skip_message(const char *, const char *, int);
317 static void printline(const char *, char *, int);
318 static void printsys(char *);
319 static int p_open(const char *, pid_t *);
320 static void readklog(void);
321 static void reapchild(int);
322 static void usage(void);
323 static int validate(struct sockaddr *, const char *);
324 static void unmapped(struct sockaddr *);
325 static void wallmsg(struct filed *, struct iovec *, const int iovlen);
326 static int waitdaemon(int, int, int);
327 static void timedout(int);
328 static void increase_rcvbuf(int);
329
330 int
331 main(int argc, char *argv[])
332 {
333 int ch, i, fdsrmax = 0, l;
334 struct sockaddr_un sunx, fromunix;
335 struct sockaddr_storage frominet;
336 fd_set *fdsr = NULL;
337 char line[MAXLINE + 1];
338 char *bindhostname;
339 const char *hname;
340 struct timeval tv, *tvp;
341 struct sigaction sact;
342 struct funix *fx, *fx1;
343 sigset_t mask;
344 pid_t ppid = 1, spid;
345 socklen_t len;
346
347 bindhostname = NULL;
348 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nNop:P:sS:Tuv"))
349 != -1)
350 switch (ch) {
351 case '4':
352 family = PF_INET;
353 break;
354 #ifdef INET6
355 case '6':
356 family = PF_INET6;
357 break;
358 #endif
359 case '8':
360 mask_C1 = 0;
361 break;
362 case 'A':
363 send_to_all++;
364 break;
365 case 'a': /* allow specific network addresses only */
366 if (allowaddr(optarg) == -1)
367 usage();
368 break;
369 case 'b':
370 bindhostname = optarg;
371 break;
372 case 'c':
373 no_compress++;
374 break;
375 case 'C':
376 logflags |= O_CREAT;
377 break;
378 case 'd': /* debug */
379 Debug++;
380 break;
381 case 'f': /* configuration file */
382 ConfFile = optarg;
383 break;
384 case 'k': /* keep remote kern fac */
385 KeepKernFac = 1;
386 break;
387 case 'l':
388 {
389 long perml;
390 mode_t mode;
391 char *name, *ep;
392
393 if (optarg[0] == '/') {
394 mode = DEFFILEMODE;
395 name = optarg;
396 } else if ((name = strchr(optarg, ':')) != NULL) {
397 *name++ = '\0';
398 if (name[0] != '/')
399 errx(1, "socket name must be absolute "
400 "path");
401 if (isdigit(*optarg)) {
402 perml = strtol(optarg, &ep, 8);
403 if (*ep || perml < 0 ||
404 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
405 errx(1, "invalid mode %s, exiting",
406 optarg);
407 mode = (mode_t )perml;
408 } else
409 errx(1, "invalid mode %s, exiting",
410 optarg);
411 } else /* doesn't begin with '/', and no ':' */
412 errx(1, "can't parse path %s", optarg);
413
414 if (strlen(name) >= sizeof(sunx.sun_path))
415 errx(1, "%s path too long, exiting", name);
416 if ((fx = malloc(sizeof(struct funix))) == NULL)
417 errx(1, "malloc failed");
418 fx->s = -1;
419 fx->name = name;
420 fx->mode = mode;
421 STAILQ_INSERT_TAIL(&funixes, fx, next);
422 break;
423 }
424 case 'm': /* mark interval */
425 MarkInterval = atoi(optarg) * 60;
426 break;
427 case 'N':
428 NoBind = 1;
429 SecureMode = 1;
430 break;
431 case 'n':
432 resolve = 0;
433 break;
434 case 'o':
435 use_bootfile = 1;
436 break;
437 case 'p': /* path */
438 if (strlen(optarg) >= sizeof(sunx.sun_path))
439 errx(1, "%s path too long, exiting", optarg);
440 funix_default.name = optarg;
441 break;
442 case 'P': /* path for alt. PID */
443 PidFile = optarg;
444 break;
445 case 's': /* no network mode */
446 SecureMode++;
447 break;
448 case 'S': /* path for privileged originator */
449 if (strlen(optarg) >= sizeof(sunx.sun_path))
450 errx(1, "%s path too long, exiting", optarg);
451 funix_secure.name = optarg;
452 break;
453 case 'T':
454 RemoteAddDate = 1;
455 break;
456 case 'u': /* only log specified priority */
457 UniquePriority++;
458 break;
459 case 'v': /* log facility and priority */
460 LogFacPri++;
461 break;
462 default:
463 usage();
464 }
465 if ((argc -= optind) != 0)
466 usage();
467
468 pfh = pidfile_open(PidFile, 0600, &spid);
469 if (pfh == NULL) {
470 if (errno == EEXIST)
471 errx(1, "syslogd already running, pid: %d", spid);
472 warn("cannot open pid file");
473 }
474
475 if (!Debug) {
476 ppid = waitdaemon(0, 0, 30);
477 if (ppid < 0) {
478 warn("could not become daemon");
479 pidfile_remove(pfh);
480 exit(1);
481 }
482 } else {
483 setlinebuf(stdout);
484 }
485
486 if (NumAllowed)
487 endservent();
488
489 consfile.f_type = F_CONSOLE;
490 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
491 sizeof(consfile.f_un.f_fname));
492 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
493 (void)signal(SIGTERM, dodie);
494 (void)signal(SIGINT, Debug ? dodie : SIG_IGN);
495 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
496 /*
497 * We don't want the SIGCHLD and SIGHUP handlers to interfere
498 * with each other; they are likely candidates for being called
499 * simultaneously (SIGHUP closes pipe descriptor, process dies,
500 * SIGCHLD happens).
501 */
502 sigemptyset(&mask);
503 sigaddset(&mask, SIGHUP);
504 sact.sa_handler = reapchild;
505 sact.sa_mask = mask;
506 sact.sa_flags = SA_RESTART;
507 (void)sigaction(SIGCHLD, &sact, NULL);
508 (void)signal(SIGALRM, domark);
509 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */
510 (void)alarm(TIMERINTVL);
511
512 TAILQ_INIT(&deadq_head);
513
514 #ifndef SUN_LEN
515 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
516 #endif
517 STAILQ_FOREACH_MUTABLE(fx, &funixes, next, fx1) {
518 (void)unlink(fx->name);
519 memset(&sunx, 0, sizeof(sunx));
520 sunx.sun_family = AF_LOCAL;
521 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path));
522 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0);
523 if (fx->s < 0 ||
524 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
525 chmod(fx->name, fx->mode) < 0) {
526 (void)snprintf(line, sizeof line,
527 "cannot create %s", fx->name);
528 logerror(line);
529 dprintf("cannot create %s (%d)\n", fx->name, errno);
530 if (fx == &funix_default || fx == &funix_secure)
531 die(0);
532 else {
533 STAILQ_REMOVE(&funixes, fx, funix, next);
534 continue;
535 }
536 }
537 increase_rcvbuf(fx->s);
538 }
539 if (SecureMode <= 1)
540 finet = socksetup(family, bindhostname);
541
542 if (finet) {
543 if (SecureMode) {
544 for (i = 0; i < *finet; i++) {
545 if (shutdown(finet[i+1], SHUT_RD) < 0) {
546 logerror("shutdown");
547 if (!Debug)
548 die(0);
549 }
550 }
551 } else {
552 dprintf("listening on inet and/or inet6 socket\n");
553 }
554 dprintf("sending on inet and/or inet6 socket\n");
555 }
556
557 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
558 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
559 fklog = -1;
560 if (fklog < 0)
561 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
562
563 /* tuck my process id away */
564 pidfile_write(pfh);
565
566 dprintf("off & running....\n");
567
568 init(0);
569 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */
570 sigemptyset(&mask);
571 sigaddset(&mask, SIGCHLD);
572 sact.sa_handler = init;
573 sact.sa_mask = mask;
574 sact.sa_flags = SA_RESTART;
575 (void)sigaction(SIGHUP, &sact, NULL);
576
577 tvp = &tv;
578 tv.tv_sec = tv.tv_usec = 0;
579
580 if (fklog != -1 && fklog > fdsrmax)
581 fdsrmax = fklog;
582 if (finet && !SecureMode) {
583 for (i = 0; i < *finet; i++) {
584 if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
585 fdsrmax = finet[i+1];
586 }
587 }
588 STAILQ_FOREACH(fx, &funixes, next)
589 if (fx->s > fdsrmax)
590 fdsrmax = fx->s;
591
592 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
593 sizeof(fd_mask));
594 if (fdsr == NULL)
595 errx(1, "calloc fd_set");
596
597 for (;;) {
598 if (MarkSet)
599 markit();
600 if (WantDie)
601 die(WantDie);
602
603 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
604 sizeof(fd_mask));
605
606 if (fklog != -1)
607 FD_SET(fklog, fdsr);
608 if (finet && !SecureMode) {
609 for (i = 0; i < *finet; i++) {
610 if (finet[i+1] != -1)
611 FD_SET(finet[i+1], fdsr);
612 }
613 }
614 STAILQ_FOREACH(fx, &funixes, next)
615 FD_SET(fx->s, fdsr);
616
617 i = select(fdsrmax+1, fdsr, NULL, NULL,
618 needdofsync ? &tv : tvp);
619 switch (i) {
620 case 0:
621 dofsync();
622 needdofsync = 0;
623 if (tvp) {
624 tvp = NULL;
625 if (ppid != 1)
626 kill(ppid, SIGALRM);
627 }
628 continue;
629 case -1:
630 if (errno != EINTR)
631 logerror("select");
632 continue;
633 }
634 if (fklog != -1 && FD_ISSET(fklog, fdsr))
635 readklog();
636 if (finet && !SecureMode) {
637 for (i = 0; i < *finet; i++) {
638 if (FD_ISSET(finet[i+1], fdsr)) {
639 len = sizeof(frominet);
640 l = recvfrom(finet[i+1], line, MAXLINE,
641 0, (struct sockaddr *)&frominet,
642 &len);
643 if (l > 0) {
644 line[l] = '\0';
645 hname = cvthname((struct sockaddr *)&frominet);
646 unmapped((struct sockaddr *)&frominet);
647 if (validate((struct sockaddr *)&frominet, hname))
648 printline(hname, line, RemoteAddDate ? ADDDATE : 0);
649 } else if (l < 0 && errno != EINTR)
650 logerror("recvfrom inet");
651 }
652 }
653 }
654 STAILQ_FOREACH(fx, &funixes, next) {
655 if (FD_ISSET(fx->s, fdsr)) {
656 len = sizeof(fromunix);
657 l = recvfrom(fx->s, line, MAXLINE, 0,
658 (struct sockaddr *)&fromunix, &len);
659 if (l > 0) {
660 line[l] = '\0';
661 printline(LocalHostName, line, 0);
662 } else if (l < 0 && errno != EINTR)
663 logerror("recvfrom unix");
664 }
665 }
666 }
667 if (fdsr)
668 free(fdsr);
669 }
670
671 static void
672 unmapped(struct sockaddr *sa)
673 {
674 struct sockaddr_in6 *sin6;
675 struct sockaddr_in sin4;
676
677 if (sa->sa_family != AF_INET6)
678 return;
679 if (sa->sa_len != sizeof(struct sockaddr_in6) ||
680 sizeof(sin4) > sa->sa_len)
681 return;
682 sin6 = (struct sockaddr_in6 *)sa;
683 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
684 return;
685
686 memset(&sin4, 0, sizeof(sin4));
687 sin4.sin_family = AF_INET;
688 sin4.sin_len = sizeof(struct sockaddr_in);
689 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
690 sizeof(sin4.sin_addr));
691 sin4.sin_port = sin6->sin6_port;
692
693 memcpy(sa, &sin4, sin4.sin_len);
694 }
695
696 static void
697 usage(void)
698 {
699
700 fprintf(stderr, "%s\n%s\n%s\n%s\n",
701 "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]",
702 " [-b bind_address] [-f config_file]",
703 " [-l [mode:]path] [-m mark_interval]",
704 " [-P pid_file] [-p log_socket]");
705 exit(1);
706 }
707
708 /*
709 * Take a raw input line, decode the message, and print the message
710 * on the appropriate log files.
711 */
712 static void
713 printline(const char *hname, char *msg, int flags)
714 {
715 char *p, *q;
716 long n;
717 int c, pri;
718 char line[MAXLINE + 1];
719
720 /* test for special codes */
721 p = msg;
722 pri = DEFUPRI;
723 if (*p == '<') {
724 errno = 0;
725 n = strtol(p + 1, &q, 10);
726 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
727 p = q + 1;
728 pri = n;
729 }
730 }
731 if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
732 pri = DEFUPRI;
733
734 /*
735 * Don't allow users to log kernel messages.
736 * NOTE: since LOG_KERN == 0 this will also match
737 * messages with no facility specified.
738 */
739 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
740 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
741
742 q = line;
743
744 while ((c = (unsigned char)*p++) != '\0' &&
745 q < &line[sizeof(line) - 4]) {
746 if (mask_C1 && (c & 0x80) && c < 0xA0) {
747 c &= 0x7F;
748 *q++ = 'M';
749 *q++ = '-';
750 }
751 if (isascii(c) && iscntrl(c)) {
752 if (c == '\n') {
753 *q++ = ' ';
754 } else if (c == '\t') {
755 *q++ = '\t';
756 } else {
757 *q++ = '^';
758 *q++ = c ^ 0100;
759 }
760 } else {
761 *q++ = c;
762 }
763 }
764 *q = '\0';
765
766 logmsg(pri, line, hname, flags);
767 }
768
769 /*
770 * Read /dev/klog while data are available, split into lines.
771 *
772 * Only dump whole lines, fixing potential write/read races that can
773 * cause lines to be split up due to the speed.
774 */
775 static void
776 readklog(void)
777 {
778 static char line[MAXLINE + 1];
779 static int len = 0;
780 char *p, *q;
781 int i;
782
783 for (;;) {
784 i = read(fklog, line + len, MAXLINE - 1 - len);
785 if (i > 0) {
786 line[i + len] = '\0';
787 } else {
788 if (i < 0 && errno != EINTR && errno != EAGAIN) {
789 logerror("klog");
790 fklog = -1;
791 }
792 break;
793 }
794
795 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
796 *q = '\0';
797 printsys(p);
798 }
799 len = strlen(p);
800 if (len >= MAXLINE - 1) {
801 printsys(p);
802 len = 0;
803 }
804 if (len > 0)
805 memmove(line, p, len + 1);
806 }
807 }
808
809 /*
810 * Take a raw input line from /dev/klog, format similar to syslog().
811 */
812 static void
813 printsys(char *msg)
814 {
815 char *p, *q;
816 long n;
817 int flags, isprintf, pri;
818
819 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */
820 p = msg;
821 pri = DEFSPRI;
822 isprintf = 1;
823 if (*p == '<') {
824 errno = 0;
825 n = strtol(p + 1, &q, 10);
826 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
827 p = q + 1;
828 pri = n;
829 isprintf = 0;
830 }
831 }
832 /*
833 * Kernel printf's and LOG_CONSOLE messages have been displayed
834 * on the console already.
835 */
836 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
837 flags |= IGN_CONS;
838 if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
839 pri = DEFSPRI;
840 logmsg(pri, p, LocalHostName, flags);
841 }
842
843 static time_t now;
844
845 /*
846 * Match a program or host name against a specification.
847 * Return a non-0 value if the message must be ignored
848 * based on the specification.
849 */
850 static int
851 skip_message(const char *name, const char *spec, int checkcase)
852 {
853 const char *s;
854 char prev, next;
855 int exclude = 0;
856 /* Behaviour on explicit match */
857
858 if (spec == NULL)
859 return 0;
860 switch (*spec) {
861 case '-':
862 exclude = 1;
863 /*FALLTHROUGH*/
864 case '+':
865 spec++;
866 break;
867 default:
868 break;
869 }
870 if (checkcase)
871 s = strstr (spec, name);
872 else
873 s = strcasestr (spec, name);
874
875 if (s != NULL) {
876 prev = (s == spec ? ',' : *(s - 1));
877 next = *(s + strlen (name));
878
879 if (prev == ',' && (next == '\0' || next == ','))
880 /* Explicit match: skip iff the spec is an
881 exclusive one. */
882 return exclude;
883 }
884
885 /* No explicit match for this name: skip the message iff
886 the spec is an inclusive one. */
887 return !exclude;
888 }
889
890 /*
891 * Log a message to the appropriate log files, users, etc. based on
892 * the priority.
893 */
894 static void
895 logmsg(int pri, const char *msg, const char *from, int flags)
896 {
897 struct filed *f;
898 int i, fac, msglen, omask, prilev;
899 const char *timestamp;
900 char prog[NAME_MAX+1];
901 char buf[MAXLINE+1];
902
903 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
904 pri, flags, from, msg);
905
906 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
907
908 /*
909 * Check to see if msg looks non-standard.
910 */
911 msglen = strlen(msg);
912 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
913 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
914 flags |= ADDDATE;
915
916 (void)time(&now);
917 if (flags & ADDDATE) {
918 timestamp = ctime(&now) + 4;
919 } else {
920 timestamp = msg;
921 msg += 16;
922 msglen -= 16;
923 }
924
925 /* skip leading blanks */
926 while (isspace(*msg)) {
927 msg++;
928 msglen--;
929 }
930
931 /* extract facility and priority level */
932 if (flags & MARK)
933 fac = LOG_NFACILITIES;
934 else
935 fac = LOG_FAC(pri);
936
937 /* Check maximum facility number. */
938 if (fac > LOG_NFACILITIES) {
939 (void)sigsetmask(omask);
940 return;
941 }
942
943 prilev = LOG_PRI(pri);
944
945 /* extract program name */
946 for (i = 0; i < NAME_MAX; i++) {
947 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
948 msg[i] == '/' || isspace(msg[i]))
949 break;
950 prog[i] = msg[i];
951 }
952 prog[i] = 0;
953
954 /* add kernel prefix for kernel messages */
955 if (flags & ISKERNEL) {
956 snprintf(buf, sizeof(buf), "%s: %s",
957 use_bootfile ? bootfile : "kernel", msg);
958 msg = buf;
959 msglen = strlen(buf);
960 }
961
962 /* log the message to the particular outputs */
963 if (!Initialized) {
964 f = &consfile;
965 /*
966 * Open in non-blocking mode to avoid hangs during open
967 * and close(waiting for the port to drain).
968 */
969 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
970
971 if (f->f_file >= 0) {
972 (void)strlcpy(f->f_lasttime, timestamp,
973 sizeof(f->f_lasttime));
974 fprintlog(f, flags, msg);
975 (void)close(f->f_file);
976 }
977 (void)sigsetmask(omask);
978 return;
979 }
980 for (f = Files; f; f = f->f_next) {
981 /* skip messages that are incorrect priority */
982 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
983 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
984 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
985 )
986 || f->f_pmask[fac] == INTERNAL_NOPRI)
987 continue;
988
989 /* skip messages with the incorrect hostname */
990 if (skip_message(from, f->f_host, 0))
991 continue;
992
993 /* skip messages with the incorrect program name */
994 if (skip_message(prog, f->f_program, 1))
995 continue;
996
997 /* skip message to console if it has already been printed */
998 if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
999 continue;
1000
1001 /* don't output marks to recently written files */
1002 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1003 continue;
1004
1005 /*
1006 * suppress duplicate lines to this file
1007 */
1008 if (no_compress - (f->f_type != F_PIPE) < 1 &&
1009 (flags & MARK) == 0 && msglen == f->f_prevlen &&
1010 f->f_prevline && !strcmp(msg, f->f_prevline) &&
1011 !strcasecmp(from, f->f_prevhost)) {
1012 (void)strlcpy(f->f_lasttime, timestamp,
1013 sizeof(f->f_lasttime));
1014 f->f_prevcount++;
1015 dprintf("msg repeated %d times, %ld sec of %d\n",
1016 f->f_prevcount, (long)(now - f->f_time),
1017 repeatinterval[f->f_repeatcount]);
1018 /*
1019 * If domark would have logged this by now,
1020 * flush it now (so we don't hold isolated messages),
1021 * but back off so we'll flush less often
1022 * in the future.
1023 */
1024 if (now > REPEATTIME(f)) {
1025 fprintlog(f, flags, NULL);
1026 BACKOFF(f);
1027 }
1028 } else {
1029 /* new line, save it */
1030 if (f->f_prevcount)
1031 fprintlog(f, 0, NULL);
1032 f->f_repeatcount = 0;
1033 f->f_prevpri = pri;
1034 (void)strlcpy(f->f_lasttime, timestamp,
1035 sizeof(f->f_lasttime));
1036 (void)strlcpy(f->f_prevhost, from,
1037 sizeof(f->f_prevhost));
1038 if (msglen < MAXSVLINE) {
1039 f->f_prevlen = msglen;
1040 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
1041 fprintlog(f, flags, NULL);
1042 } else {
1043 f->f_prevline[0] = 0;
1044 f->f_prevlen = 0;
1045 fprintlog(f, flags, msg);
1046 }
1047 }
1048 }
1049 (void)sigsetmask(omask);
1050 }
1051
1052 static void
1053 dofsync(void)
1054 {
1055 struct filed *f;
1056
1057 for (f = Files; f; f = f->f_next) {
1058 if ((f->f_type == F_FILE) &&
1059 (f->f_flags & FFLAG_NEEDSYNC)) {
1060 f->f_flags &= ~FFLAG_NEEDSYNC;
1061 (void)fsync(f->f_file);
1062 }
1063 }
1064 }
1065
1066 #define IOV_SIZE 7
1067 static void
1068 fprintlog(struct filed *f, int flags, const char *msg)
1069 {
1070 struct iovec iov[IOV_SIZE];
1071 struct iovec *v;
1072 struct addrinfo *r;
1073 int i, l, lsent = 0;
1074 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
1075 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
1076 const char *msgret;
1077
1078 v = iov;
1079 if (f->f_type == F_WALL) {
1080 v->iov_base = greetings;
1081 /* The time displayed is not synchornized with the other log
1082 * destinations (like messages). Following fragment was using
1083 * ctime(&now), which was updating the time every 30 sec.
1084 * With f_lasttime, time is synchronized correctly.
1085 */
1086 v->iov_len = snprintf(greetings, sizeof greetings,
1087 "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
1088 f->f_prevhost, f->f_lasttime);
1089 if (v->iov_len >= sizeof greetings)
1090 v->iov_len = sizeof greetings - 1;
1091 v++;
1092 v->iov_base = nul;
1093 v->iov_len = 0;
1094 v++;
1095 } else {
1096 v->iov_base = f->f_lasttime;
1097 v->iov_len = strlen(f->f_lasttime);
1098 v++;
1099 v->iov_base = space;
1100 v->iov_len = 1;
1101 v++;
1102 }
1103
1104 if (LogFacPri) {
1105 static char fp_buf[30]; /* Hollow laugh */
1106 int fac = f->f_prevpri & LOG_FACMASK;
1107 int pri = LOG_PRI(f->f_prevpri);
1108 const char *f_s = NULL;
1109 char f_n[5]; /* Hollow laugh */
1110 const char *p_s = NULL;
1111 char p_n[5]; /* Hollow laugh */
1112
1113 if (LogFacPri > 1) {
1114 const CODE *c;
1115
1116 for (c = facilitynames; c->c_name; c++) {
1117 if (c->c_val == fac) {
1118 f_s = c->c_name;
1119 break;
1120 }
1121 }
1122 for (c = prioritynames; c->c_name; c++) {
1123 if (c->c_val == pri) {
1124 p_s = c->c_name;
1125 break;
1126 }
1127 }
1128 }
1129 if (!f_s) {
1130 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1131 f_s = f_n;
1132 }
1133 if (!p_s) {
1134 snprintf(p_n, sizeof p_n, "%d", pri);
1135 p_s = p_n;
1136 }
1137 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
1138 v->iov_base = fp_buf;
1139 v->iov_len = strlen(fp_buf);
1140 } else {
1141 v->iov_base = nul;
1142 v->iov_len = 0;
1143 }
1144 v++;
1145
1146 v->iov_base = f->f_prevhost;
1147 v->iov_len = strlen(v->iov_base);
1148 v++;
1149 v->iov_base = space;
1150 v->iov_len = 1;
1151 v++;
1152
1153 if (msg) {
1154 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1155 if (wmsg == NULL) {
1156 logerror("strdup");
1157 exit(1);
1158 }
1159 v->iov_base = wmsg;
1160 v->iov_len = strlen(msg);
1161 } else if (f->f_prevcount > 1) {
1162 v->iov_base = repbuf;
1163 v->iov_len = snprintf(repbuf, sizeof repbuf,
1164 "last message repeated %d times", f->f_prevcount);
1165 } else if (f->f_prevline) {
1166 v->iov_base = f->f_prevline;
1167 v->iov_len = f->f_prevlen;
1168 } else {
1169 return;
1170 }
1171 v++;
1172
1173 dprintf("Logging to %s", TypeNames[f->f_type]);
1174 f->f_time = now;
1175
1176 switch (f->f_type) {
1177 int port;
1178 case F_UNUSED:
1179 dprintf("\n");
1180 break;
1181
1182 case F_FORW:
1183 port = (int)ntohs(((struct sockaddr_in *)
1184 (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1185 if (port != 514) {
1186 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port);
1187 } else {
1188 dprintf(" %s\n", f->f_un.f_forw.f_hname);
1189 }
1190 /* check for local vs remote messages */
1191 if (strcasecmp(f->f_prevhost, LocalHostName))
1192 l = snprintf(line, sizeof line - 1,
1193 "<%d>%.15s Forwarded from %s: %s",
1194 f->f_prevpri, (char *)iov[0].iov_base,
1195 f->f_prevhost, (char *)iov[5].iov_base);
1196 else
1197 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1198 f->f_prevpri, (char *)iov[0].iov_base,
1199 (char *)iov[5].iov_base);
1200 if (l < 0)
1201 l = 0;
1202 else if (l > MAXLINE)
1203 l = MAXLINE;
1204
1205 if (finet) {
1206 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1207 for (i = 0; i < *finet; i++) {
1208 #if 0
1209 /*
1210 * should we check AF first, or just
1211 * trial and error? FWD
1212 */
1213 if (r->ai_family ==
1214 address_family_of(finet[i+1]))
1215 #endif
1216 lsent = sendto(finet[i+1], line, l, 0,
1217 r->ai_addr, r->ai_addrlen);
1218 if (lsent == l)
1219 break;
1220 }
1221 if (lsent == l && !send_to_all)
1222 break;
1223 }
1224 dprintf("lsent/l: %d/%d\n", lsent, l);
1225 if (lsent != l) {
1226 int e = errno;
1227 logerror("sendto");
1228 errno = e;
1229 switch (errno) {
1230 case ENOBUFS:
1231 case ENETDOWN:
1232 case ENETUNREACH:
1233 case EHOSTUNREACH:
1234 case EHOSTDOWN:
1235 case EADDRNOTAVAIL:
1236 break;
1237 /* case EBADF: */
1238 /* case EACCES: */
1239 /* case ENOTSOCK: */
1240 /* case EFAULT: */
1241 /* case EMSGSIZE: */
1242 /* case EAGAIN: */
1243 /* case ENOBUFS: */
1244 /* case ECONNREFUSED: */
1245 default:
1246 dprintf("removing entry: errno=%d\n", e);
1247 f->f_type = F_UNUSED;
1248 break;
1249 }
1250 }
1251 }
1252 break;
1253
1254 case F_FILE:
1255 dprintf(" %s\n", f->f_un.f_fname);
1256 v->iov_base = lf;
1257 v->iov_len = 1;
1258 if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1259 /*
1260 * If writev(2) fails for potentially transient errors
1261 * like the filesystem being full, ignore it.
1262 * Otherwise remove this logfile from the list.
1263 */
1264 if (errno != ENOSPC) {
1265 int e = errno;
1266 (void)close(f->f_file);
1267 f->f_type = F_UNUSED;
1268 errno = e;
1269 logerror(f->f_un.f_fname);
1270 }
1271 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1272 f->f_flags |= FFLAG_NEEDSYNC;
1273 needdofsync = 1;
1274 }
1275 break;
1276
1277 case F_PIPE:
1278 dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1279 v->iov_base = lf;
1280 v->iov_len = 1;
1281 if (f->f_un.f_pipe.f_pid == 0) {
1282 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1283 &f->f_un.f_pipe.f_pid)) < 0) {
1284 f->f_type = F_UNUSED;
1285 logerror(f->f_un.f_pipe.f_pname);
1286 break;
1287 }
1288 }
1289 if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1290 int e = errno;
1291 (void)close(f->f_file);
1292 if (f->f_un.f_pipe.f_pid > 0)
1293 deadq_enter(f->f_un.f_pipe.f_pid,
1294 f->f_un.f_pipe.f_pname);
1295 f->f_un.f_pipe.f_pid = 0;
1296 errno = e;
1297 logerror(f->f_un.f_pipe.f_pname);
1298 }
1299 break;
1300
1301 case F_CONSOLE:
1302 if (flags & IGN_CONS) {
1303 dprintf(" (ignored)\n");
1304 break;
1305 }
1306 /* FALLTHROUGH */
1307
1308 case F_TTY:
1309 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1310 v->iov_base = crlf;
1311 v->iov_len = 2;
1312
1313 errno = 0; /* ttymsg() only sometimes returns an errno */
1314 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) {
1315 f->f_type = F_UNUSED;
1316 logerror(msgret);
1317 }
1318 break;
1319
1320 case F_USERS:
1321 case F_WALL:
1322 dprintf("\n");
1323 v->iov_base = crlf;
1324 v->iov_len = 2;
1325 wallmsg(f, iov, IOV_SIZE);
1326 break;
1327 }
1328 f->f_prevcount = 0;
1329 free(wmsg);
1330 }
1331
1332 /*
1333 * WALLMSG -- Write a message to the world at large
1334 *
1335 * Write the specified message to either the entire
1336 * world, or a list of approved users.
1337 */
1338 static void
1339 wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1340 {
1341 static int reenter; /* avoid calling ourselves */
1342 struct utmpx *ut;
1343 int i;
1344 const char *p;
1345
1346 if (reenter++)
1347 return;
1348 setutxent();
1349 /* NOSTRICT */
1350 while ((ut = getutxent()) != NULL) {
1351 if (ut->ut_type != USER_PROCESS)
1352 continue;
1353 if (f->f_type == F_WALL) {
1354 if ((p = ttymsg(iov, iovlen, ut->ut_line,
1355 TTYMSGTIME)) != NULL) {
1356 errno = 0; /* already in msg */
1357 logerror(p);
1358 }
1359 continue;
1360 }
1361 /* should we send the message to this user? */
1362 for (i = 0; i < MAXUNAMES; i++) {
1363 if (!f->f_un.f_uname[i][0])
1364 break;
1365 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) {
1366 if ((p = ttymsg(iov, iovlen, ut->ut_line,
1367 TTYMSGTIME)) != NULL) {
1368 errno = 0; /* already in msg */
1369 logerror(p);
1370 }
1371 break;
1372 }
1373 }
1374 }
1375 endutxent();
1376 reenter = 0;
1377 }
1378
1379 static void
1380 reapchild(int signo __unused)
1381 {
1382 int status;
1383 pid_t pid;
1384 struct filed *f;
1385
1386 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) {
1387 if (!Initialized)
1388 /* Don't tell while we are initting. */
1389 continue;
1390
1391 /* First, look if it's a process from the dead queue. */
1392 if (deadq_remove(pid))
1393 continue;
1394
1395 /* Now, look in list of active processes. */
1396 for (f = Files; f; f = f->f_next) {
1397 if (f->f_type == F_PIPE &&
1398 f->f_un.f_pipe.f_pid == pid) {
1399 (void)close(f->f_file);
1400 f->f_un.f_pipe.f_pid = 0;
1401 log_deadchild(pid, status,
1402 f->f_un.f_pipe.f_pname);
1403 break;
1404 }
1405 }
1406 }
1407 }
1408
1409 /*
1410 * Return a printable representation of a host address.
1411 */
1412 static const char *
1413 cvthname(struct sockaddr *f)
1414 {
1415 int error, hl;
1416 sigset_t omask, nmask;
1417 static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1418
1419 error = getnameinfo((struct sockaddr *)f,
1420 ((struct sockaddr *)f)->sa_len,
1421 ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
1422 dprintf("cvthname(%s)\n", ip);
1423
1424 if (error) {
1425 dprintf("Malformed from address %s\n", gai_strerror(error));
1426 return ("???");
1427 }
1428 if (!resolve)
1429 return (ip);
1430
1431 sigemptyset(&nmask);
1432 sigaddset(&nmask, SIGHUP);
1433 sigprocmask(SIG_BLOCK, &nmask, &omask);
1434 error = getnameinfo((struct sockaddr *)f,
1435 ((struct sockaddr *)f)->sa_len,
1436 hname, sizeof hname, NULL, 0, NI_NAMEREQD);
1437 sigprocmask(SIG_SETMASK, &omask, NULL);
1438 if (error) {
1439 dprintf("Host name for your address (%s) unknown\n", ip);
1440 return (ip);
1441 }
1442 hl = strlen(hname);
1443 if (hl > 0 && hname[hl-1] == '.')
1444 hname[--hl] = '\0';
1445 trimdomain(hname, hl);
1446 return (hname);
1447 }
1448
1449 static void
1450 dodie(int signo)
1451 {
1452
1453 WantDie = signo;
1454 }
1455
1456 static void
1457 domark(int signo __unused)
1458 {
1459
1460 MarkSet = 1;
1461 }
1462
1463 /*
1464 * Print syslogd errors some place.
1465 */
1466 static void
1467 logerror(const char *type)
1468 {
1469 char buf[512];
1470 static int recursed = 0;
1471
1472 /* If there's an error while trying to log an error, give up. */
1473 if (recursed)
1474 return;
1475 recursed++;
1476 if (errno)
1477 (void)snprintf(buf,
1478 sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1479 else
1480 (void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1481 errno = 0;
1482 dprintf("%s\n", buf);
1483 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1484 recursed--;
1485 }
1486
1487 static void
1488 die(int signo)
1489 {
1490 struct filed *f;
1491 struct funix *fx;
1492 int was_initialized;
1493 char buf[100];
1494
1495 was_initialized = Initialized;
1496 Initialized = 0; /* Don't log SIGCHLDs. */
1497 for (f = Files; f != NULL; f = f->f_next) {
1498 /* flush any pending output */
1499 if (f->f_prevcount)
1500 fprintlog(f, 0, NULL);
1501 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) {
1502 (void)close(f->f_file);
1503 f->f_un.f_pipe.f_pid = 0;
1504 }
1505 }
1506 Initialized = was_initialized;
1507 if (signo) {
1508 dprintf("syslogd: exiting on signal %d\n", signo);
1509 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1510 errno = 0;
1511 logerror(buf);
1512 }
1513 STAILQ_FOREACH(fx, &funixes, next)
1514 (void)unlink(fx->name);
1515 pidfile_remove(pfh);
1516
1517 exit(1);
1518 }
1519
1520 /*
1521 * INIT -- Initialize syslogd from configuration table
1522 */
1523 static void
1524 init(int signo)
1525 {
1526 int i;
1527 FILE *cf;
1528 struct filed *f, *next, **nextp;
1529 char *p;
1530 char cline[LINE_MAX];
1531 char prog[NAME_MAX+1];
1532 char host[MAXHOSTNAMELEN];
1533 char oldLocalHostName[MAXHOSTNAMELEN];
1534 char hostMsg[2*MAXHOSTNAMELEN+40];
1535 char bootfileMsg[LINE_MAX];
1536
1537 dprintf("init\n");
1538
1539 /*
1540 * Load hostname (may have changed).
1541 */
1542 if (signo != 0)
1543 (void)strlcpy(oldLocalHostName, LocalHostName,
1544 sizeof(oldLocalHostName));
1545 if (gethostname(LocalHostName, sizeof(LocalHostName)))
1546 err(EX_OSERR, "gethostname() failed");
1547 if ((p = strchr(LocalHostName, '.')) != NULL) {
1548 *p++ = '\0';
1549 LocalDomain = p;
1550 } else {
1551 LocalDomain = "";
1552 }
1553
1554 /*
1555 * Close all open log files.
1556 */
1557 Initialized = 0;
1558 for (f = Files; f != NULL; f = next) {
1559 /* flush any pending output */
1560 if (f->f_prevcount)
1561 fprintlog(f, 0, NULL);
1562
1563 switch (f->f_type) {
1564 case F_FILE:
1565 case F_FORW:
1566 case F_CONSOLE:
1567 case F_TTY:
1568 (void)close(f->f_file);
1569 break;
1570 case F_PIPE:
1571 if (f->f_un.f_pipe.f_pid > 0) {
1572 (void)close(f->f_file);
1573 deadq_enter(f->f_un.f_pipe.f_pid,
1574 f->f_un.f_pipe.f_pname);
1575 }
1576 f->f_un.f_pipe.f_pid = 0;
1577 break;
1578 }
1579 next = f->f_next;
1580 if (f->f_program) free(f->f_program);
1581 if (f->f_host) free(f->f_host);
1582 free((char *)f);
1583 }
1584 Files = NULL;
1585 nextp = &Files;
1586
1587 /* open the configuration file */
1588 if ((cf = fopen(ConfFile, "r")) == NULL) {
1589 dprintf("cannot open %s\n", ConfFile);
1590 *nextp = (struct filed *)calloc(1, sizeof(*f));
1591 if (*nextp == NULL) {
1592 logerror("calloc");
1593 exit(1);
1594 }
1595 cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1596 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1597 if ((*nextp)->f_next == NULL) {
1598 logerror("calloc");
1599 exit(1);
1600 }
1601 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1602 Initialized = 1;
1603 return;
1604 }
1605
1606 /*
1607 * Foreach line in the conf table, open that file.
1608 */
1609 f = NULL;
1610 (void)strlcpy(host, "*", sizeof(host));
1611 (void)strlcpy(prog, "*", sizeof(prog));
1612 while (fgets(cline, sizeof(cline), cf) != NULL) {
1613 /*
1614 * check for end-of-section, comments, strip off trailing
1615 * spaces and newline character. #!prog is treated specially:
1616 * following lines apply only to that program.
1617 */
1618 for (p = cline; isspace(*p); ++p)
1619 continue;
1620 if (*p == 0)
1621 continue;
1622 if (*p == '#') {
1623 p++;
1624 if (*p != '!' && *p != '+' && *p != '-')
1625 continue;
1626 }
1627 if (*p == '+' || *p == '-') {
1628 host[0] = *p++;
1629 while (isspace(*p))
1630 p++;
1631 if ((!*p) || (*p == '*')) {
1632 (void)strlcpy(host, "*", sizeof(host));
1633 continue;
1634 }
1635 if (*p == '@')
1636 p = LocalHostName;
1637 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1638 if (!isalnum(*p) && *p != '.' && *p != '-'
1639 && *p != ',' && *p != ':' && *p != '%')
1640 break;
1641 host[i] = *p++;
1642 }
1643 host[i] = '\0';
1644 continue;
1645 }
1646 if (*p == '!') {
1647 p++;
1648 while (isspace(*p)) p++;
1649 if ((!*p) || (*p == '*')) {
1650 (void)strlcpy(prog, "*", sizeof(prog));
1651 continue;
1652 }
1653 for (i = 0; i < NAME_MAX; i++) {
1654 if (!isprint(p[i]) || isspace(p[i]))
1655 break;
1656 prog[i] = p[i];
1657 }
1658 prog[i] = 0;
1659 continue;
1660 }
1661 for (p = cline + 1; *p != '\0'; p++) {
1662 if (*p != '#')
1663 continue;
1664 if (*(p - 1) == '\\') {
1665 strcpy(p - 1, p);
1666 p--;
1667 continue;
1668 }
1669 *p = '\0';
1670 break;
1671 }
1672 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1673 cline[i] = '\0';
1674 f = (struct filed *)calloc(1, sizeof(*f));
1675 if (f == NULL) {
1676 logerror("calloc");
1677 exit(1);
1678 }
1679 *nextp = f;
1680 nextp = &f->f_next;
1681 cfline(cline, f, prog, host);
1682 }
1683
1684 /* close the configuration file */
1685 (void)fclose(cf);
1686
1687 Initialized = 1;
1688
1689 if (Debug) {
1690 int port;
1691 for (f = Files; f; f = f->f_next) {
1692 for (i = 0; i <= LOG_NFACILITIES; i++)
1693 if (f->f_pmask[i] == INTERNAL_NOPRI)
1694 printf("X ");
1695 else
1696 printf("%d ", f->f_pmask[i]);
1697 printf("%s: ", TypeNames[f->f_type]);
1698 switch (f->f_type) {
1699 case F_FILE:
1700 printf("%s", f->f_un.f_fname);
1701 break;
1702
1703 case F_CONSOLE:
1704 case F_TTY:
1705 printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1706 break;
1707
1708 case F_FORW:
1709 port = (int)ntohs(((struct sockaddr_in *)
1710 (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1711 if (port != 514) {
1712 printf("%s:%d",
1713 f->f_un.f_forw.f_hname, port);
1714 } else {
1715 printf("%s", f->f_un.f_forw.f_hname);
1716 }
1717 break;
1718
1719 case F_PIPE:
1720 printf("%s", f->f_un.f_pipe.f_pname);
1721 break;
1722
1723 case F_USERS:
1724 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1725 printf("%s, ", f->f_un.f_uname[i]);
1726 break;
1727 }
1728 if (f->f_program)
1729 printf(" (%s)", f->f_program);
1730 printf("\n");
1731 }
1732 }
1733
1734 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1735 dprintf("syslogd: restarted\n");
1736 /*
1737 * Log a change in hostname, but only on a restart.
1738 */
1739 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1740 (void)snprintf(hostMsg, sizeof(hostMsg),
1741 "syslogd: hostname changed, \"%s\" to \"%s\"",
1742 oldLocalHostName, LocalHostName);
1743 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1744 dprintf("%s\n", hostMsg);
1745 }
1746 /*
1747 * Log the kernel boot file if we aren't going to use it as
1748 * the prefix, and if this is *not* a restart.
1749 */
1750 if (signo == 0 && !use_bootfile) {
1751 (void)snprintf(bootfileMsg, sizeof(bootfileMsg),
1752 "syslogd: kernel boot file is %s", bootfile);
1753 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1754 dprintf("%s\n", bootfileMsg);
1755 }
1756 }
1757
1758 /*
1759 * Crack a configuration file line
1760 */
1761 static void
1762 cfline(const char *line, struct filed *f, const char *prog, const char *host)
1763 {
1764 struct addrinfo hints, *res;
1765 int error, i, pri, syncfile;
1766 const char *p, *q;
1767 char *bp;
1768 char buf[MAXLINE], ebuf[100];
1769
1770 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1771
1772 errno = 0; /* keep strerror() stuff out of logerror messages */
1773
1774 /* clear out file entry */
1775 memset(f, 0, sizeof(*f));
1776 for (i = 0; i <= LOG_NFACILITIES; i++)
1777 f->f_pmask[i] = INTERNAL_NOPRI;
1778
1779 /* save hostname if any */
1780 if (host && *host == '*')
1781 host = NULL;
1782 if (host) {
1783 int hl;
1784
1785 f->f_host = strdup(host);
1786 if (f->f_host == NULL) {
1787 logerror("strdup");
1788 exit(1);
1789 }
1790 hl = strlen(f->f_host);
1791 if (hl > 0 && f->f_host[hl-1] == '.')
1792 f->f_host[--hl] = '\0';
1793 trimdomain(f->f_host, hl);
1794 }
1795
1796 /* save program name if any */
1797 if (prog && *prog == '*')
1798 prog = NULL;
1799 if (prog) {
1800 f->f_program = strdup(prog);
1801 if (f->f_program == NULL) {
1802 logerror("strdup");
1803 exit(1);
1804 }
1805 }
1806
1807 /* scan through the list of selectors */
1808 for (p = line; *p && *p != '\t' && *p != ' ';) {
1809 int pri_done;
1810 int pri_cmp;
1811 int pri_invert;
1812
1813 /* find the end of this facility name list */
1814 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1815 continue;
1816
1817 /* get the priority comparison */
1818 pri_cmp = 0;
1819 pri_done = 0;
1820 pri_invert = 0;
1821 if (*q == '!') {
1822 pri_invert = 1;
1823 q++;
1824 }
1825 while (!pri_done) {
1826 switch (*q) {
1827 case '<':
1828 pri_cmp |= PRI_LT;
1829 q++;
1830 break;
1831 case '=':
1832 pri_cmp |= PRI_EQ;
1833 q++;
1834 break;
1835 case '>':
1836 pri_cmp |= PRI_GT;
1837 q++;
1838 break;
1839 default:
1840 pri_done++;
1841 break;
1842 }
1843 }
1844
1845 /* collect priority name */
1846 for (bp = buf; *q && !strchr("\t,; ", *q); )
1847 *bp++ = *q++;
1848 *bp = '\0';
1849
1850 /* skip cruft */
1851 while (strchr(",;", *q))
1852 q++;
1853
1854 /* decode priority name */
1855 if (*buf == '*') {
1856 pri = LOG_PRIMASK;
1857 pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1858 } else {
1859 /* Ignore trailing spaces. */
1860 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
1861 buf[i] = '\0';
1862
1863 pri = decode(buf, prioritynames);
1864 if (pri < 0) {
1865 errno = 0;
1866 (void)snprintf(ebuf, sizeof ebuf,
1867 "unknown priority name \"%s\"", buf);
1868 logerror(ebuf);
1869 return;
1870 }
1871 }
1872 if (!pri_cmp)
1873 pri_cmp = (UniquePriority)
1874 ? (PRI_EQ)
1875 : (PRI_EQ | PRI_GT)
1876 ;
1877 if (pri_invert)
1878 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
1879
1880 /* scan facilities */
1881 while (*p && !strchr("\t.; ", *p)) {
1882 for (bp = buf; *p && !strchr("\t,;. ", *p); )
1883 *bp++ = *p++;
1884 *bp = '\0';
1885
1886 if (*buf == '*') {
1887 for (i = 0; i < LOG_NFACILITIES; i++) {
1888 f->f_pmask[i] = pri;
1889 f->f_pcmp[i] = pri_cmp;
1890 }
1891 } else {
1892 i = decode(buf, facilitynames);
1893 if (i < 0) {
1894 errno = 0;
1895 (void)snprintf(ebuf, sizeof ebuf,
1896 "unknown facility name \"%s\"",
1897 buf);
1898 logerror(ebuf);
1899 return;
1900 }
1901 f->f_pmask[i >> 3] = pri;
1902 f->f_pcmp[i >> 3] = pri_cmp;
1903 }
1904 while (*p == ',' || *p == ' ')
1905 p++;
1906 }
1907
1908 p = q;
1909 }
1910
1911 /* skip to action part */
1912 while (*p == '\t' || *p == ' ')
1913 p++;
1914
1915 if (*p == '-') {
1916 syncfile = 0;
1917 p++;
1918 } else
1919 syncfile = 1;
1920
1921 switch (*p) {
1922 case '@':
1923 {
1924 char *tp;
1925 char endkey = ':';
1926 /*
1927 * scan forward to see if there is a port defined.
1928 * so we can't use strlcpy..
1929 */
1930 i = sizeof(f->f_un.f_forw.f_hname);
1931 tp = f->f_un.f_forw.f_hname;
1932 p++;
1933
1934 /*
1935 * an ipv6 address should start with a '[' in that case
1936 * we should scan for a ']'
1937 */
1938 if (*p == '[') {
1939 p++;
1940 endkey = ']';
1941 }
1942 while (*p && (*p != endkey) && (i-- > 0)) {
1943 *tp++ = *p++;
1944 }
1945 if (endkey == ']' && *p == endkey)
1946 p++;
1947 *tp = '\0';
1948 }
1949 /* See if we copied a domain and have a port */
1950 if (*p == ':')
1951 p++;
1952 else
1953 p = NULL;
1954
1955 memset(&hints, 0, sizeof(hints));
1956 hints.ai_family = family;
1957 hints.ai_socktype = SOCK_DGRAM;
1958 error = getaddrinfo(f->f_un.f_forw.f_hname,
1959 p ? p : "syslog", &hints, &res);
1960 if (error) {
1961 logerror(gai_strerror(error));
1962 break;
1963 }
1964 f->f_un.f_forw.f_addr = res;
1965 f->f_type = F_FORW;
1966 break;
1967
1968 case '/':
1969 if ((f->f_file = open(p, logflags, 0600)) < 0) {
1970 f->f_type = F_UNUSED;
1971 logerror(p);
1972 break;
1973 }
1974 if (syncfile)
1975 f->f_flags |= FFLAG_SYNC;
1976 if (isatty(f->f_file)) {
1977 if (strcmp(p, ctty) == 0)
1978 f->f_type = F_CONSOLE;
1979 else
1980 f->f_type = F_TTY;
1981 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
1982 sizeof(f->f_un.f_fname));
1983 } else {
1984 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
1985 f->f_type = F_FILE;
1986 }
1987 break;
1988
1989 case '|':
1990 f->f_un.f_pipe.f_pid = 0;
1991 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1,
1992 sizeof(f->f_un.f_pipe.f_pname));
1993 f->f_type = F_PIPE;
1994 break;
1995
1996 case '*':
1997 f->f_type = F_WALL;
1998 break;
1999
2000 default:
2001 for (i = 0; i < MAXUNAMES && *p; i++) {
2002 for (q = p; *q && *q != ','; )
2003 q++;
2004 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1);
2005 if ((q - p) >= MAXLOGNAME)
2006 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0';
2007 else
2008 f->f_un.f_uname[i][q - p] = '\0';
2009 while (*q == ',' || *q == ' ')
2010 q++;
2011 p = q;
2012 }
2013 f->f_type = F_USERS;
2014 break;
2015 }
2016 }
2017
2018
2019 /*
2020 * Decode a symbolic name to a numeric value
2021 */
2022 static int
2023 decode(const char *name, const CODE *codetab)
2024 {
2025 const CODE *c;
2026 char *p, buf[40];
2027
2028 if (isdigit(*name))
2029 return (atoi(name));
2030
2031 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2032 if (isupper(*name))
2033 *p = tolower(*name);
2034 else
2035 *p = *name;
2036 }
2037 *p = '\0';
2038 for (c = codetab; c->c_name; c++)
2039 if (!strcmp(buf, c->c_name))
2040 return (c->c_val);
2041
2042 return (-1);
2043 }
2044
2045 static void
2046 markit(void)
2047 {
2048 struct filed *f;
2049 dq_t q, next;
2050
2051 now = time(NULL);
2052 MarkSeq += TIMERINTVL;
2053 if (MarkSeq >= MarkInterval) {
2054 logmsg(LOG_INFO, "-- MARK --",
2055 LocalHostName, ADDDATE|MARK);
2056 MarkSeq = 0;
2057 }
2058
2059 for (f = Files; f; f = f->f_next) {
2060 if (f->f_prevcount && now >= REPEATTIME(f)) {
2061 dprintf("flush %s: repeated %d times, %d sec.\n",
2062 TypeNames[f->f_type], f->f_prevcount,
2063 repeatinterval[f->f_repeatcount]);
2064 fprintlog(f, 0, NULL);
2065 BACKOFF(f);
2066 }
2067 }
2068
2069 /* Walk the dead queue, and see if we should signal somebody. */
2070 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2071 next = TAILQ_NEXT(q, dq_entries);
2072
2073 switch (q->dq_timeout) {
2074 case 0:
2075 /* Already signalled once, try harder now. */
2076 if (kill(q->dq_pid, SIGKILL) != 0)
2077 (void)deadq_remove(q->dq_pid);
2078 break;
2079
2080 case 1:
2081 /*
2082 * Timed out on dead queue, send terminate
2083 * signal. Note that we leave the removal
2084 * from the dead queue to reapchild(), which
2085 * will also log the event (unless the process
2086 * didn't even really exist, in case we simply
2087 * drop it from the dead queue).
2088 */
2089 if (kill(q->dq_pid, SIGTERM) != 0)
2090 (void)deadq_remove(q->dq_pid);
2091 /* FALLTHROUGH */
2092
2093 default:
2094 q->dq_timeout--;
2095 }
2096 }
2097 MarkSet = 0;
2098 (void)alarm(TIMERINTVL);
2099 }
2100
2101 /*
2102 * fork off and become a daemon, but wait for the child to come online
2103 * before returing to the parent, or we get disk thrashing at boot etc.
2104 * Set a timer so we don't hang forever if it wedges.
2105 */
2106 static int
2107 waitdaemon(int nochdir, int noclose, int maxwait)
2108 {
2109 int fd;
2110 int status;
2111 pid_t pid, childpid;
2112
2113 switch (childpid = fork()) {
2114 case -1:
2115 return (-1);
2116 case 0:
2117 break;
2118 default:
2119 signal(SIGALRM, timedout);
2120 alarm(maxwait);
2121 while ((pid = wait3(&status, 0, NULL)) != -1) {
2122 if (WIFEXITED(status))
2123 errx(1, "child pid %d exited with return code %d",
2124 pid, WEXITSTATUS(status));
2125 if (WIFSIGNALED(status))
2126 errx(1, "child pid %d exited on signal %d%s",
2127 pid, WTERMSIG(status),
2128 WCOREDUMP(status) ? " (core dumped)" :
2129 "");
2130 if (pid == childpid) /* it's gone... */
2131 break;
2132 }
2133 exit(0);
2134 }
2135
2136 if (setsid() == -1)
2137 return (-1);
2138
2139 if (!nochdir)
2140 (void)chdir("/");
2141
2142 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2143 (void)dup2(fd, STDIN_FILENO);
2144 (void)dup2(fd, STDOUT_FILENO);
2145 (void)dup2(fd, STDERR_FILENO);
2146 if (fd > 2)
2147 (void)close (fd);
2148 }
2149 return (getppid());
2150 }
2151
2152 /*
2153 * We get a SIGALRM from the child when it's running and finished doing it's
2154 * fsync()'s or O_SYNC writes for all the boot messages.
2155 *
2156 * We also get a signal from the kernel if the timer expires, so check to
2157 * see what happened.
2158 */
2159 static void
2160 timedout(int sig __unused)
2161 {
2162 int left;
2163 left = alarm(0);
2164 signal(SIGALRM, SIG_DFL);
2165 if (left == 0)
2166 errx(1, "timed out waiting for child");
2167 else
2168 _exit(0);
2169 }
2170
2171 /*
2172 * Add `s' to the list of allowable peer addresses to accept messages
2173 * from.
2174 *
2175 * `s' is a string in the form:
2176 *
2177 * [*]domainname[:{servicename|portnumber|*}]
2178 *
2179 * or
2180 *
2181 * netaddr/maskbits[:{servicename|portnumber|*}]
2182 *
2183 * Returns -1 on error, 0 if the argument was valid.
2184 */
2185 static int
2186 allowaddr(char *s)
2187 {
2188 char *cp1, *cp2;
2189 struct allowedpeer ap;
2190 struct servent *se;
2191 int masklen = -1;
2192 struct addrinfo hints, *res;
2193 struct in_addr *addrp, *maskp;
2194 #ifdef INET6
2195 int i;
2196 u_int32_t *addr6p, *mask6p;
2197 #endif
2198 char ip[NI_MAXHOST];
2199
2200 #ifdef INET6
2201 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2202 #endif
2203 cp1 = s;
2204 if ((cp1 = strrchr(cp1, ':'))) {
2205 /* service/port provided */
2206 *cp1++ = '\0';
2207 if (strlen(cp1) == 1 && *cp1 == '*')
2208 /* any port allowed */
2209 ap.port = 0;
2210 else if ((se = getservbyname(cp1, "udp"))) {
2211 ap.port = ntohs(se->s_port);
2212 } else {
2213 ap.port = strtol(cp1, &cp2, 0);
2214 if (*cp2 != '\0')
2215 return (-1); /* port not numeric */
2216 }
2217 } else {
2218 if ((se = getservbyname("syslog", "udp")))
2219 ap.port = ntohs(se->s_port);
2220 else
2221 /* sanity, should not happen */
2222 ap.port = 514;
2223 }
2224
2225 if ((cp1 = strchr(s, '/')) != NULL &&
2226 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2227 *cp1 = '\0';
2228 if ((masklen = atoi(cp1 + 1)) < 0)
2229 return (-1);
2230 }
2231 #ifdef INET6
2232 if (*s == '[') {
2233 cp2 = s + strlen(s) - 1;
2234 if (*cp2 == ']') {
2235 ++s;
2236 *cp2 = '\0';
2237 } else {
2238 cp2 = NULL;
2239 }
2240 } else {
2241 cp2 = NULL;
2242 }
2243 #endif
2244 memset(&hints, 0, sizeof(hints));
2245 hints.ai_family = PF_UNSPEC;
2246 hints.ai_socktype = SOCK_DGRAM;
2247 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2248 if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2249 ap.isnumeric = 1;
2250 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2251 memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2252 ap.a_mask.ss_family = res->ai_family;
2253 if (res->ai_family == AF_INET) {
2254 ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2255 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2256 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2257 if (masklen < 0) {
2258 /* use default netmask */
2259 if (IN_CLASSA(ntohl(addrp->s_addr)))
2260 maskp->s_addr = htonl(IN_CLASSA_NET);
2261 else if (IN_CLASSB(ntohl(addrp->s_addr)))
2262 maskp->s_addr = htonl(IN_CLASSB_NET);
2263 else
2264 maskp->s_addr = htonl(IN_CLASSC_NET);
2265 } else if (masklen <= 32) {
2266 /* convert masklen to netmask */
2267 if (masklen == 0)
2268 maskp->s_addr = 0;
2269 else
2270 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2271 } else {
2272 freeaddrinfo(res);
2273 return (-1);
2274 }
2275 /* Lose any host bits in the network number. */
2276 addrp->s_addr &= maskp->s_addr;
2277 }
2278 #ifdef INET6
2279 else if (res->ai_family == AF_INET6 && masklen <= 128) {
2280 ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2281 if (masklen < 0)
2282 masklen = 128;
2283 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2284 /* convert masklen to netmask */
2285 while (masklen > 0) {
2286 if (masklen < 32) {
2287 *mask6p = htonl(~(0xffffffff >> masklen));
2288 break;
2289 }
2290 *mask6p++ = 0xffffffff;
2291 masklen -= 32;
2292 }
2293 /* Lose any host bits in the network number. */
2294 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2295 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2296 for (i = 0; i < 4; i++)
2297 addr6p[i] &= mask6p[i];
2298 }
2299 #endif
2300 else {
2301 freeaddrinfo(res);
2302 return (-1);
2303 }
2304 freeaddrinfo(res);
2305 } else {
2306 /* arg `s' is domain name */
2307 ap.isnumeric = 0;
2308 ap.a_name = s;
2309 if (cp1)
2310 *cp1 = '/';
2311 #ifdef INET6
2312 if (cp2) {
2313 *cp2 = ']';
2314 --s;
2315 }
2316 #endif
2317 }
2318
2319 if (Debug) {
2320 printf("allowaddr: rule %d: ", NumAllowed);
2321 if (ap.isnumeric) {
2322 printf("numeric, ");
2323 getnameinfo((struct sockaddr *)&ap.a_addr,
2324 ((struct sockaddr *)&ap.a_addr)->sa_len,
2325 ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2326 printf("addr = %s, ", ip);
2327 getnameinfo((struct sockaddr *)&ap.a_mask,
2328 ((struct sockaddr *)&ap.a_mask)->sa_len,
2329 ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2330 printf("mask = %s; ", ip);
2331 } else {
2332 printf("domainname = %s; ", ap.a_name);
2333 }
2334 printf("port = %d\n", ap.port);
2335 }
2336
2337 if ((AllowedPeers = realloc(AllowedPeers,
2338 ++NumAllowed * sizeof(struct allowedpeer)))
2339 == NULL) {
2340 logerror("realloc");
2341 exit(1);
2342 }
2343 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2344 return (0);
2345 }
2346
2347 /*
2348 * Validate that the remote peer has permission to log to us.
2349 */
2350 static int
2351 validate(struct sockaddr *sa, const char *hname)
2352 {
2353 int i;
2354 size_t l1, l2;
2355 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2356 struct allowedpeer *ap;
2357 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2358 #ifdef INET6
2359 int j, reject;
2360 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2361 #endif
2362 struct addrinfo hints, *res;
2363 u_short sport;
2364
2365 if (NumAllowed == 0)
2366 /* traditional behaviour, allow everything */
2367 return (1);
2368
2369 (void)strlcpy(name, hname, sizeof(name));
2370 memset(&hints, 0, sizeof(hints));
2371 hints.ai_family = PF_UNSPEC;
2372 hints.ai_socktype = SOCK_DGRAM;
2373 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2374 if (getaddrinfo(name, NULL, &hints, &res) == 0)
2375 freeaddrinfo(res);
2376 else if (strchr(name, '.') == NULL) {
2377 strlcat(name, ".", sizeof name);
2378 strlcat(name, LocalDomain, sizeof name);
2379 }
2380 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2381 NI_NUMERICHOST | NI_NUMERICSERV) != 0)
2382 return (0); /* for safety, should not occur */
2383 dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2384 ip, port, name);
2385 sport = atoi(port);
2386
2387 /* now, walk down the list */
2388 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2389 if (ap->port != 0 && ap->port != sport) {
2390 dprintf("rejected in rule %d due to port mismatch.\n", i);
2391 continue;
2392 }
2393
2394 if (ap->isnumeric) {
2395 if (ap->a_addr.ss_family != sa->sa_family) {
2396 dprintf("rejected in rule %d due to address family mismatch.\n", i);
2397 continue;
2398 }
2399 if (ap->a_addr.ss_family == AF_INET) {
2400 sin4 = (struct sockaddr_in *)sa;
2401 a4p = (struct sockaddr_in *)&ap->a_addr;
2402 m4p = (struct sockaddr_in *)&ap->a_mask;
2403 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2404 != a4p->sin_addr.s_addr) {
2405 dprintf("rejected in rule %d due to IP mismatch.\n", i);
2406 continue;
2407 }
2408 }
2409 #ifdef INET6
2410 else if (ap->a_addr.ss_family == AF_INET6) {
2411 sin6 = (struct sockaddr_in6 *)sa;
2412 a6p = (struct sockaddr_in6 *)&ap->a_addr;
2413 m6p = (struct sockaddr_in6 *)&ap->a_mask;
2414 if (a6p->sin6_scope_id != 0 &&
2415 sin6->sin6_scope_id != a6p->sin6_scope_id) {
2416 dprintf("rejected in rule %d due to scope mismatch.\n", i);
2417 continue;
2418 }
2419 reject = 0;
2420 for (j = 0; j < 16; j += 4) {
2421 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2422 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2423 ++reject;
2424 break;
2425 }
2426 }
2427 if (reject) {
2428 dprintf("rejected in rule %d due to IP mismatch.\n", i);
2429 continue;
2430 }
2431 }
2432 #endif
2433 else
2434 continue;
2435 } else {
2436 cp = ap->a_name;
2437 l1 = strlen(name);
2438 if (*cp == '*') {
2439 /* allow wildmatch */
2440 cp++;
2441 l2 = strlen(cp);
2442 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2443 dprintf("rejected in rule %d due to name mismatch.\n", i);
2444 continue;
2445 }
2446 } else {
2447 /* exact match */
2448 l2 = strlen(cp);
2449 if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2450 dprintf("rejected in rule %d due to name mismatch.\n", i);
2451 continue;
2452 }
2453 }
2454 }
2455 dprintf("accepted in rule %d.\n", i);
2456 return (1); /* hooray! */
2457 }
2458 return (0);
2459 }
2460
2461 /*
2462 * Fairly similar to popen(3), but returns an open descriptor, as
2463 * opposed to a FILE *.
2464 */
2465 static int
2466 p_open(const char *prog, pid_t *rpid)
2467 {
2468 int pfd[2], nulldesc;
2469 pid_t pid;
2470 sigset_t omask, mask;
2471 char *argv[4]; /* sh -c cmd NULL */
2472 char errmsg[200];
2473
2474 if (pipe(pfd) == -1)
2475 return (-1);
2476 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2477 /* we are royally screwed anyway */
2478 return (-1);
2479
2480 sigemptyset(&mask);
2481 sigaddset(&mask, SIGALRM);
2482 sigaddset(&mask, SIGHUP);
2483 sigprocmask(SIG_BLOCK, &mask, &omask);
2484 switch ((pid = fork())) {
2485 case -1:
2486 sigprocmask(SIG_SETMASK, &omask, 0);
2487 close(nulldesc);
2488 return (-1);
2489
2490 case 0:
2491 argv[0] = strdup("sh");
2492 argv[1] = strdup("-c");
2493 argv[2] = strdup(prog);
2494 argv[3] = NULL;
2495 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2496 logerror("strdup");
2497 exit(1);
2498 }
2499
2500 alarm(0);
2501 (void)setsid(); /* Avoid catching SIGHUPs. */
2502
2503 /*
2504 * Throw away pending signals, and reset signal
2505 * behaviour to standard values.
2506 */
2507 signal(SIGALRM, SIG_IGN);
2508 signal(SIGHUP, SIG_IGN);
2509 sigprocmask(SIG_SETMASK, &omask, 0);
2510 signal(SIGPIPE, SIG_DFL);
2511 signal(SIGQUIT, SIG_DFL);
2512 signal(SIGALRM, SIG_DFL);
2513 signal(SIGHUP, SIG_DFL);
2514
2515 dup2(pfd[0], STDIN_FILENO);
2516 dup2(nulldesc, STDOUT_FILENO);
2517 dup2(nulldesc, STDERR_FILENO);
2518 closefrom(3);
2519
2520 (void)execvp(_PATH_BSHELL, argv);
2521 _exit(255);
2522 }
2523
2524 sigprocmask(SIG_SETMASK, &omask, 0);
2525 close(nulldesc);
2526 close(pfd[0]);
2527 /*
2528 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are
2529 * supposed to get an EWOULDBLOCK on writev(2), which is
2530 * caught by the logic above anyway, which will in turn close
2531 * the pipe, and fork a new logging subprocess if necessary.
2532 * The stale subprocess will be killed some time later unless
2533 * it terminated itself due to closing its input pipe (so we
2534 * get rid of really dead puppies).
2535 */
2536 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2537 /* This is bad. */
2538 (void)snprintf(errmsg, sizeof errmsg,
2539 "Warning: cannot change pipe to PID %d to "
2540 "non-blocking behaviour.",
2541 (int)pid);
2542 logerror(errmsg);
2543 }
2544 *rpid = pid;
2545 return (pfd[1]);
2546 }
2547
2548 static void
2549 deadq_enter(pid_t pid, const char *name)
2550 {
2551 dq_t p;
2552 int status;
2553
2554 /*
2555 * Be paranoid, if we can't signal the process, don't enter it
2556 * into the dead queue (perhaps it's already dead). If possible,
2557 * we try to fetch and log the child's status.
2558 */
2559 if (kill(pid, 0) != 0) {
2560 if (waitpid(pid, &status, WNOHANG) > 0)
2561 log_deadchild(pid, status, name);
2562 return;
2563 }
2564
2565 p = malloc(sizeof(struct deadq_entry));
2566 if (p == NULL) {
2567 logerror("malloc");
2568 exit(1);
2569 }
2570
2571 p->dq_pid = pid;
2572 p->dq_timeout = DQ_TIMO_INIT;
2573 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2574 }
2575
2576 static int
2577 deadq_remove(pid_t pid)
2578 {
2579 dq_t q;
2580
2581 TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2582 if (q->dq_pid == pid) {
2583 TAILQ_REMOVE(&deadq_head, q, dq_entries);
2584 free(q);
2585 return (1);
2586 }
2587 }
2588
2589 return (0);
2590 }
2591
2592 static void
2593 log_deadchild(pid_t pid, int status, const char *name)
2594 {
2595 int code;
2596 char buf[256];
2597 const char *reason;
2598
2599 errno = 0; /* Keep strerror() stuff out of logerror messages. */
2600 if (WIFSIGNALED(status)) {
2601 reason = "due to signal";
2602 code = WTERMSIG(status);
2603 } else {
2604 reason = "with status";
2605 code = WEXITSTATUS(status);
2606 if (code == 0)
2607 return;
2608 }
2609 (void)snprintf(buf, sizeof buf,
2610 "Logging subprocess %d (%s) exited %s %d.",
2611 pid, name, reason, code);
2612 logerror(buf);
2613 }
2614
2615 static int *
2616 socksetup(int af, char *bindhostname)
2617 {
2618 struct addrinfo hints, *res, *r;
2619 const char *bindservice;
2620 char *cp;
2621 int error, maxs, *s, *socks;
2622
2623 /*
2624 * We have to handle this case for backwards compatibility:
2625 * If there are two (or more) colons but no '[' and ']',
2626 * assume this is an inet6 address without a service.
2627 */
2628 bindservice = "syslog";
2629 if (bindhostname != NULL) {
2630 #ifdef INET6
2631 if (*bindhostname == '[' &&
2632 (cp = strchr(bindhostname + 1, ']')) != NULL) {
2633 ++bindhostname;
2634 *cp = '\0';
2635 if (cp[1] == ':' && cp[2] != '\0')
2636 bindservice = cp + 2;
2637 } else {
2638 #endif
2639 cp = strchr(bindhostname, ':');
2640 if (cp != NULL && strchr(cp + 1, ':') == NULL) {
2641 *cp = '\0';
2642 if (cp[1] != '\0')
2643 bindservice = cp + 1;
2644 if (cp == bindhostname)
2645 bindhostname = NULL;
2646 }
2647 #ifdef INET6
2648 }
2649 #endif
2650 }
2651
2652 memset(&hints, 0, sizeof(hints));
2653 hints.ai_flags = AI_PASSIVE;
2654 hints.ai_family = af;
2655 hints.ai_socktype = SOCK_DGRAM;
2656 error = getaddrinfo(bindhostname, bindservice, &hints, &res);
2657 if (error) {
2658 logerror(gai_strerror(error));
2659 errno = 0;
2660 die(0);
2661 }
2662
2663 /* Count max number of sockets we may open */
2664 for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2665 socks = malloc((maxs+1) * sizeof(int));
2666 if (socks == NULL) {
2667 logerror("couldn't allocate memory for sockets");
2668 die(0);
2669 }
2670
2671 *socks = 0; /* num of sockets counter at start of array */
2672 s = socks + 1;
2673 for (r = res; r; r = r->ai_next) {
2674 int on = 1;
2675 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2676 if (*s < 0) {
2677 logerror("socket");
2678 continue;
2679 }
2680 #ifdef INET6
2681 if (r->ai_family == AF_INET6) {
2682 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2683 (char *)&on, sizeof (on)) < 0) {
2684 logerror("setsockopt");
2685 close(*s);
2686 continue;
2687 }
2688 }
2689 #endif
2690 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
2691 (char *)&on, sizeof (on)) < 0) {
2692 logerror("setsockopt");
2693 close(*s);
2694 continue;
2695 }
2696 /*
2697 * RFC 3164 recommends that client side message
2698 * should come from the privileged syslogd port.
2699 *
2700 * If the system administrator choose not to obey
2701 * this, we can skip the bind() step so that the
2702 * system will choose a port for us.
2703 */
2704 if (!NoBind) {
2705 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2706 logerror("bind");
2707 close(*s);
2708 continue;
2709 }
2710
2711 if (!SecureMode)
2712 increase_rcvbuf(*s);
2713 }
2714
2715 (*socks)++;
2716 s++;
2717 }
2718
2719 if (*socks == 0) {
2720 free(socks);
2721 if (Debug)
2722 return (NULL);
2723 else
2724 die(0);
2725 }
2726 if (res)
2727 freeaddrinfo(res);
2728
2729 return (socks);
2730 }
2731
2732 static void
2733 increase_rcvbuf(int fd)
2734 {
2735 socklen_t len, slen;
2736
2737 slen = sizeof(len);
2738
2739 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
2740 if (len < RCVBUF_MINSIZE) {
2741 len = RCVBUF_MINSIZE;
2742 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len));
2743 }
2744 }
2745 }
DragonFly BSD