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vknetd - Add pidfile and signal handlers.
[dragonfly.git] / usr.sbin / syslogd / syslogd.c
blob4f72452e86e65ad02421e54b3b1f506adcfc3fc3
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 * 4. 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: src/usr.sbin/syslogd/syslogd.c,v 1.163 2008/12/19 18:27:51 delphij Exp $
31 * $DragonFly: src/usr.sbin/syslogd/syslogd.c,v 1.6 2007/08/09 02:17:46 dillon Exp $
32 */
33
34 /*
35 * syslogd -- log system messages
36 *
37 * This program implements a system log. It takes a series of lines.
38 * Each line may have a priority, signified as "<n>" as
39 * the first characters of the line. If this is
40 * not present, a default priority is used.
41 *
42 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will
43 * cause it to reread its configuration file.
44 *
45 * Defined Constants:
46 *
47 * MAXLINE -- the maximum line length that can be handled.
48 * DEFUPRI -- the default priority for user messages
49 * DEFSPRI -- the default priority for kernel messages
50 *
51 * Author: Eric Allman
52 * extensive changes by Ralph Campbell
53 * more extensive changes by Eric Allman (again)
54 * Extension to log by program name as well as facility and priority
55 * by Peter da Silva.
56 * -u and -v by Harlan Stenn.
57 * Priority comparison code by Harlan Stenn.
58 * Ring buffer code by Jeff Wheelhouse.
59 */
60
61 #define MAXLINE 1024 /* maximum line length */
62 #define MAXSVLINE 120 /* maximum saved line length */
63 #define DEFUPRI (LOG_USER|LOG_NOTICE)
64 #define DEFSPRI (LOG_KERN|LOG_CRIT)
65 #define TIMERINTVL 30 /* interval for checking flush, mark */
66 #define TTYMSGTIME 1 /* timeout passed to ttymsg */
67
68 #include <sys/param.h>
69 #include <sys/ioctl.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/mman.h>
80 #include <sys/types.h>
81
82 #include <netinet/in.h>
83 #include <netdb.h>
84 #include <arpa/inet.h>
85
86 #include <ctype.h>
87 #include <err.h>
88 #include <errno.h>
89 #include <fcntl.h>
90 #include <libutil.h>
91 #include <limits.h>
92 #include <paths.h>
93 #include <signal.h>
94 #include <stdio.h>
95 #include <stdlib.h>
96 #include <string.h>
97 #include <sysexits.h>
98 #include <unistd.h>
99 #include "utmpentry.h"
100
101 #include "pathnames.h"
102 #include "ttymsg.h"
103 #include "../clog/clog.h"
104 #include "../nscd/pidfile.h"
105
106 #define SYSLOG_NAMES
107 #include <sys/syslog.h>
108
109 const char *ConfFile = _PATH_LOGCONF;
110 const char *PidFile = _PATH_LOGPID;
111 const char ctty[] = _PATH_CONSOLE;
112 const char ring_magic[] = "CLOG";
113
114 #define dprintf if (Debug) printf
115
116 #define MAXUNAMES 20 /* maximum number of user names */
117
118 /*
119 * Unix sockets.
120 * We have two default sockets, one with 666 permissions,
121 * and one for privileged programs.
122 */
123 struct funix {
124 int s;
125 const char *name;
126 mode_t mode;
127 STAILQ_ENTRY(funix) next;
128 };
129 struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
130 { NULL } };
131 struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE,
132 { &funix_secure } };
133
134 STAILQ_HEAD(, funix) funixes = { &funix_default,
135 &(funix_secure.next.stqe_next) };
136
137 /*
138 * Flags to logmsg().
139 */
140
141 #define IGN_CONS 0x001 /* don't print on console */
142 #define SYNC_FILE 0x002 /* do fsync on file after printing */
143 #define ADDDATE 0x004 /* add a date to the message */
144 #define MARK 0x008 /* this message is a mark */
145 #define ISKERNEL 0x010 /* kernel generated message */
146
147 /*
148 * This structure represents the files that will have log
149 * copies printed.
150 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
151 * or if f_type if F_PIPE and f_pid > 0.
152 */
153
154 struct filed {
155 struct filed *f_next; /* next in linked list */
156 short f_type; /* entry type, see below */
157 short f_file; /* file descriptor */
158 time_t f_time; /* time this was last written */
159 char *f_host; /* host from which to recd. */
160 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */
161 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */
162 #define PRI_LT 0x1
163 #define PRI_EQ 0x2
164 #define PRI_GT 0x4
165 char *f_program; /* program this applies to */
166 union {
167 char f_uname[MAXUNAMES][32+1];
168 struct {
169 char f_hname[MAXHOSTNAMELEN];
170 struct addrinfo *f_addr;
171
172 } f_forw; /* forwarding address */
173 char f_fname[MAXPATHLEN];
174 struct {
175 char f_pname[MAXPATHLEN];
176 pid_t f_pid;
177 } f_pipe;
178 struct {
179 char f_rname[MAXPATHLEN];
180 struct clog_footer *f_footer;
181 size_t f_size;
182 } f_ring;
183 } f_un;
184 char f_prevline[MAXSVLINE]; /* last message logged */
185 char f_lasttime[16]; /* time of last occurrence */
186 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */
187 int f_prevpri; /* pri of f_prevline */
188 int f_prevlen; /* length of f_prevline */
189 int f_prevcount; /* repetition cnt of prevline */
190 u_int f_repeatcount; /* number of "repeated" msgs */
191 int f_flags; /* file-specific flags */
192 #define FFLAG_SYNC 0x01
193 #define FFLAG_NEEDSYNC 0x02
194 };
195
196 /*
197 * Queue of about-to-be dead processes we should watch out for.
198 */
199
200 TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
201 struct stailhead *deadq_headp;
202
203 struct deadq_entry {
204 pid_t dq_pid;
205 int dq_timeout;
206 TAILQ_ENTRY(deadq_entry) dq_entries;
207 };
208
209 /*
210 * The timeout to apply to processes waiting on the dead queue. Unit
211 * of measure is `mark intervals', i.e. 20 minutes by default.
212 * Processes on the dead queue will be terminated after that time.
213 */
214
215 #define DQ_TIMO_INIT 2
216
217 typedef struct deadq_entry *dq_t;
218
219
220 /*
221 * Struct to hold records of network addresses that are allowed to log
222 * to us.
223 */
224 struct allowedpeer {
225 int isnumeric;
226 u_short port;
227 union {
228 struct {
229 struct sockaddr_storage addr;
230 struct sockaddr_storage mask;
231 } numeric;
232 char *name;
233 } u;
234 #define a_addr u.numeric.addr
235 #define a_mask u.numeric.mask
236 #define a_name u.name
237 };
238
239
240 /*
241 * Intervals at which we flush out "message repeated" messages,
242 * in seconds after previous message is logged. After each flush,
243 * we move to the next interval until we reach the largest.
244 */
245 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */
246 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
247 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount])
248 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \
249 (f)->f_repeatcount = MAXREPEAT; \
250 }
251
252 /* values for f_type */
253 #define F_UNUSED 0 /* unused entry */
254 #define F_FILE 1 /* regular file */
255 #define F_TTY 2 /* terminal */
256 #define F_CONSOLE 3 /* console terminal */
257 #define F_FORW 4 /* remote machine */
258 #define F_USERS 5 /* list of users */
259 #define F_WALL 6 /* everyone logged on */
260 #define F_PIPE 7 /* pipe to program */
261 #define F_RING 8 /* ring buffer (circular log) */
262
263 const char *TypeNames[] = {
264 "UNUSED", "FILE", "TTY", "CONSOLE",
265 "FORW", "USERS", "WALL", "PIPE",
266 "RING"
267 };
268
269 static struct filed *Files; /* Log files that we write to */
270 static struct filed consfile; /* Console */
271
272 static int Debug; /* debug flag */
273 static int resolve = 1; /* resolve hostname */
274 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */
275 static const char *LocalDomain; /* our local domain name */
276 static int *finet; /* Internet datagram socket */
277 static int fklog = -1; /* /dev/klog */
278 static int Initialized; /* set when we have initialized ourselves */
279 static int MarkInterval = 20 * 60; /* interval between marks in seconds */
280 static int MarkSeq; /* mark sequence number */
281 static int SecureMode; /* when true, receive only unix domain socks */
282 #ifdef INET6
283 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
284 #else
285 static int family = PF_INET; /* protocol family (IPv4 only) */
286 #endif
287 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */
288 static int send_to_all; /* send message to all IPv4/IPv6 addresses */
289 static int use_bootfile; /* log entire bootfile for every kern msg */
290 static int no_compress; /* don't compress messages (1=pipes, 2=all) */
291 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
292
293 static char bootfile[MAXLINE+1]; /* booted kernel file */
294
295 struct allowedpeer *AllowedPeers; /* List of allowed peers */
296 static int NumAllowed; /* Number of entries in AllowedPeers */
297 static int RemoteAddDate; /* Always set the date on remote messages */
298
299 static int UniquePriority; /* Only log specified priority? */
300 static int LogFacPri; /* Put facility and priority in log message: */
301 /* 0=no, 1=numeric, 2=names */
302 static int KeepKernFac; /* Keep remotely logged kernel facility */
303 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
304 static struct pidfh *pfh;
305
306 volatile sig_atomic_t MarkSet, WantDie;
307
308 static int allowaddr(char *);
309 static void cfline(const char *, struct filed *,
310 const char *, const char *);
311 static const char *cvthname(struct sockaddr *);
312 static void deadq_enter(pid_t, const char *);
313 static int deadq_remove(pid_t);
314 static int decode(const char *, CODE *);
315 static void die(int);
316 static void dodie(int);
317 static void dofsync(void);
318 static void domark(int);
319 static void fprintlog(struct filed *, int, const char *);
320 static int *socksetup(int, const char *);
321 static void init(int);
322 static void logerror(const char *);
323 static void logmsg(int, const char *, const char *, int);
324 static void log_deadchild(pid_t, int, const char *);
325 static void markit(void);
326 static int skip_message(const char *, const char *, int);
327 static void printline(const char *, char *, int);
328 static void printsys(char *);
329 static int p_open(const char *, pid_t *);
330 ssize_t rbwrite(struct filed *, char *, size_t);
331 ssize_t rbwritev(struct filed *, struct iovec *, int);
332 static void readklog(void);
333 static void reapchild(int);
334 static void usage(void);
335 static int validate(struct sockaddr *, const char *);
336 static void unmapped(struct sockaddr *);
337 static void wallmsg(struct filed *, struct iovec *, const int iovlen);
338 static int waitdaemon(int, int, int);
339 static void timedout(int);
340 static void double_rbuf(int);
341
342 int
343 main(int argc, char *argv[])
344 {
345 int ch, i, fdsrmax = 0, l;
346 struct sockaddr_un sunx, fromunix;
347 struct sockaddr_storage frominet;
348 fd_set *fdsr = NULL;
349 char line[MAXLINE + 1];
350 const char *bindhostname, *hname;
351 struct timeval tv, *tvp;
352 struct sigaction sact;
353 struct funix *fx, *fx1;
354 sigset_t mask;
355 pid_t ppid = 1, spid;
356 socklen_t len;
357
358 bindhostname = NULL;
359 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nop:P:sS:Tuv"))
360 != -1)
361 switch (ch) {
362 case '4':
363 family = PF_INET;
364 break;
365 #ifdef INET6
366 case '6':
367 family = PF_INET6;
368 break;
369 #endif
370 case '8':
371 mask_C1 = 0;
372 break;
373 case 'A':
374 send_to_all++;
375 break;
376 case 'a': /* allow specific network addresses only */
377 if (allowaddr(optarg) == -1)
378 usage();
379 break;
380 case 'b':
381 bindhostname = optarg;
382 break;
383 case 'c':
384 no_compress++;
385 break;
386 case 'C':
387 logflags |= O_CREAT;
388 break;
389 case 'd': /* debug */
390 Debug++;
391 break;
392 case 'f': /* configuration file */
393 ConfFile = optarg;
394 break;
395 case 'k': /* keep remote kern fac */
396 KeepKernFac = 1;
397 break;
398 case 'l':
399 {
400 long perml;
401 mode_t mode;
402 char *name, *ep;
403
404 if (optarg[0] == '/') {
405 mode = DEFFILEMODE;
406 name = optarg;
407 } else if ((name = strchr(optarg, ':')) != NULL) {
408 *name++ = '\0';
409 if (name[0] != '/')
410 errx(1, "socket name must be absolute "
411 "path");
412 if (isdigit(*optarg)) {
413 perml = strtol(optarg, &ep, 8);
414 if (*ep || perml < 0 ||
415 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
416 errx(1, "invalid mode %s, exiting",
417 optarg);
418 mode = (mode_t )perml;
419 } else
420 errx(1, "invalid mode %s, exiting",
421 optarg);
422 } else /* doesn't begin with '/', and no ':' */
423 errx(1, "can't parse path %s", optarg);
424
425 if (strlen(name) >= sizeof(sunx.sun_path))
426 errx(1, "%s path too long, exiting", name);
427 if ((fx = malloc(sizeof(struct funix))) == NULL)
428 errx(1, "malloc failed");
429 fx->s = -1;
430 fx->name = name;
431 fx->mode = mode;
432 STAILQ_INSERT_TAIL(&funixes, fx, next);
433 break;
434 }
435 case 'm': /* mark interval */
436 MarkInterval = atoi(optarg) * 60;
437 break;
438 case 'n':
439 resolve = 0;
440 break;
441 case 'o':
442 use_bootfile = 1;
443 break;
444 case 'p': /* path */
445 if (strlen(optarg) >= sizeof(sunx.sun_path))
446 errx(1, "%s path too long, exiting", optarg);
447 funix_default.name = optarg;
448 break;
449 case 'P': /* path for alt. PID */
450 PidFile = optarg;
451 break;
452 case 's': /* no network mode */
453 SecureMode++;
454 break;
455 case 'S': /* path for privileged originator */
456 if (strlen(optarg) >= sizeof(sunx.sun_path))
457 errx(1, "%s path too long, exiting", optarg);
458 funix_secure.name = optarg;
459 break;
460 case 'T':
461 RemoteAddDate = 1;
462 break;
463 case 'u': /* only log specified priority */
464 UniquePriority++;
465 break;
466 case 'v': /* log facility and priority */
467 LogFacPri++;
468 break;
469 default:
470 usage();
471 }
472 if ((argc -= optind) != 0)
473 usage();
474
475 pfh = pidfile_open(PidFile, 0600, &spid);
476 if (pfh == NULL) {
477 if (errno == EEXIST)
478 errx(1, "syslogd already running, pid: %d", spid);
479 warn("cannot open pid file");
480 }
481
482 if (!Debug) {
483 ppid = waitdaemon(0, 0, 30);
484 if (ppid < 0) {
485 warn("could not become daemon");
486 pidfile_remove(pfh);
487 exit(1);
488 }
489 } else {
490 setlinebuf(stdout);
491 }
492
493 if (NumAllowed)
494 endservent();
495
496 consfile.f_type = F_CONSOLE;
497 strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
498 sizeof(consfile.f_un.f_fname));
499 strlcpy(bootfile, getbootfile(), sizeof(bootfile));
500 signal(SIGTERM, dodie);
501 signal(SIGINT, Debug ? dodie : SIG_IGN);
502 signal(SIGQUIT, Debug ? dodie : SIG_IGN);
503 /*
504 * We don't want the SIGCHLD and SIGHUP handlers to interfere
505 * with each other; they are likely candidates for being called
506 * simultaneously (SIGHUP closes pipe descriptor, process dies,
507 * SIGCHLD happens).
508 */
509 sigemptyset(&mask);
510 sigaddset(&mask, SIGHUP);
511 sact.sa_handler = reapchild;
512 sact.sa_mask = mask;
513 sact.sa_flags = SA_RESTART;
514 sigaction(SIGCHLD, &sact, NULL);
515 signal(SIGALRM, domark);
516 signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */
517 alarm(TIMERINTVL);
518
519 TAILQ_INIT(&deadq_head);
520
521 #ifndef SUN_LEN
522 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
523 #endif
524 STAILQ_FOREACH_MUTABLE(fx, &funixes, next, fx1) {
525 unlink(fx->name);
526 memset(&sunx, 0, sizeof(sunx));
527 sunx.sun_family = AF_LOCAL;
528 strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path));
529 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0);
530 if (fx->s < 0 ||
531 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
532 chmod(fx->name, fx->mode) < 0) {
533 snprintf(line, sizeof line,
534 "cannot create %s", fx->name);
535 logerror(line);
536 dprintf("cannot create %s (%d)\n", fx->name, errno);
537 if (fx == &funix_default || fx == &funix_secure)
538 die(0);
539 else {
540 STAILQ_REMOVE(&funixes, fx, funix, next);
541 continue;
542 }
543 double_rbuf(fx->s);
544 }
545 }
546 if (SecureMode <= 1)
547 finet = socksetup(family, bindhostname);
548
549 if (finet) {
550 if (SecureMode) {
551 for (i = 0; i < *finet; i++) {
552 if (shutdown(finet[i+1], SHUT_RD) < 0) {
553 logerror("shutdown");
554 if (!Debug)
555 die(0);
556 }
557 }
558 } else {
559 dprintf("listening on inet and/or inet6 socket\n");
560 }
561 dprintf("sending on inet and/or inet6 socket\n");
562 }
563
564 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
565 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
566 fklog = -1;
567 if (fklog < 0)
568 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
569
570 /* tuck my process id away */
571 pidfile_write(pfh);
572
573 dprintf("off & running....\n");
574
575 init(0);
576 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */
577 sigemptyset(&mask);
578 sigaddset(&mask, SIGCHLD);
579 sact.sa_handler = init;
580 sact.sa_mask = mask;
581 sact.sa_flags = SA_RESTART;
582 sigaction(SIGHUP, &sact, NULL);
583
584 tvp = &tv;
585 tv.tv_sec = tv.tv_usec = 0;
586
587 if (fklog != -1 && fklog > fdsrmax)
588 fdsrmax = fklog;
589 if (finet && !SecureMode) {
590 for (i = 0; i < *finet; i++) {
591 if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
592 fdsrmax = finet[i+1];
593 }
594 }
595 STAILQ_FOREACH(fx, &funixes, next)
596 if (fx->s > fdsrmax)
597 fdsrmax = fx->s;
598
599 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
600 sizeof(fd_mask));
601 if (fdsr == NULL)
602 errx(1, "calloc fd_set");
603
604 for (;;) {
605 if (MarkSet)
606 markit();
607 if (WantDie)
608 die(WantDie);
609
610 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
611 sizeof(fd_mask));
612
613 if (fklog != -1)
614 FD_SET(fklog, fdsr);
615 if (finet && !SecureMode) {
616 for (i = 0; i < *finet; i++) {
617 if (finet[i+1] != -1)
618 FD_SET(finet[i+1], fdsr);
619 }
620 }
621 STAILQ_FOREACH(fx, &funixes, next)
622 FD_SET(fx->s, fdsr);
623
624 i = select(fdsrmax+1, fdsr, NULL, NULL,
625 needdofsync ? &tv : tvp);
626 switch (i) {
627 case 0:
628 dofsync();
629 needdofsync = 0;
630 if (tvp) {
631 tvp = NULL;
632 if (ppid != 1)
633 kill(ppid, SIGALRM);
634 }
635 continue;
636 case -1:
637 if (errno != EINTR)
638 logerror("select");
639 continue;
640 }
641 if (fklog != -1 && FD_ISSET(fklog, fdsr))
642 readklog();
643 if (finet && !SecureMode) {
644 for (i = 0; i < *finet; i++) {
645 if (FD_ISSET(finet[i+1], fdsr)) {
646 len = sizeof(frominet);
647 l = recvfrom(finet[i+1], line, MAXLINE,
648 0, (struct sockaddr *)&frominet,
649 &len);
650 if (l > 0) {
651 line[l] = '\0';
652 hname = cvthname((struct sockaddr *)&frominet);
653 unmapped((struct sockaddr *)&frominet);
654 if (validate((struct sockaddr *)&frominet, hname))
655 printline(hname, line, RemoteAddDate ? ADDDATE : 0);
656 } else if (l < 0 && errno != EINTR)
657 logerror("recvfrom inet");
658 }
659 }
660 }
661 STAILQ_FOREACH(fx, &funixes, next) {
662 if (FD_ISSET(fx->s, fdsr)) {
663 len = sizeof(fromunix);
664 l = recvfrom(fx->s, line, MAXLINE, 0,
665 (struct sockaddr *)&fromunix, &len);
666 if (l > 0) {
667 line[l] = '\0';
668 printline(LocalHostName, line, 0);
669 } else if (l < 0 && errno != EINTR)
670 logerror("recvfrom unix");
671 }
672 }
673 }
674 if (fdsr)
675 free(fdsr);
676 }
677
678 static void
679 unmapped(struct sockaddr *sa)
680 {
681 struct sockaddr_in6 *sin6;
682 struct sockaddr_in sin4;
683
684 if (sa->sa_family != AF_INET6)
685 return;
686 if (sa->sa_len != sizeof(struct sockaddr_in6) ||
687 sizeof(sin4) > sa->sa_len)
688 return;
689 sin6 = (struct sockaddr_in6 *)sa;
690 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
691 return;
692
693 memset(&sin4, 0, sizeof(sin4));
694 sin4.sin_family = AF_INET;
695 sin4.sin_len = sizeof(struct sockaddr_in);
696 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
697 sizeof(sin4.sin_addr));
698 sin4.sin_port = sin6->sin6_port;
699
700 memcpy(sa, &sin4, sin4.sin_len);
701 }
702
703 static void
704 usage(void)
705 {
706
707 fprintf(stderr, "%s\n%s\n%s\n%s\n",
708 "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]",
709 " [-b bind_address] [-f config_file]",
710 " [-l [mode:]path] [-m mark_interval]",
711 " [-P pid_file] [-p log_socket]");
712 exit(1);
713 }
714
715 /*
716 * Take a raw input line, decode the message, and print the message
717 * on the appropriate log files.
718 */
719 static void
720 printline(const char *hname, char *msg, int flags)
721 {
722 char *p, *q;
723 long n;
724 int c, pri;
725 char line[MAXLINE + 1];
726
727 /* test for special codes */
728 p = msg;
729 pri = DEFUPRI;
730 if (*p == '<') {
731 errno = 0;
732 n = strtol(p + 1, &q, 10);
733 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
734 p = q + 1;
735 pri = n;
736 }
737 }
738 if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
739 pri = DEFUPRI;
740
741 /*
742 * Don't allow users to log kernel messages.
743 * NOTE: since LOG_KERN == 0 this will also match
744 * messages with no facility specified.
745 */
746 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
747 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
748
749 q = line;
750
751 while ((c = (unsigned char)*p++) != '\0' &&
752 q < &line[sizeof(line) - 4]) {
753 if (mask_C1 && (c & 0x80) && c < 0xA0) {
754 c &= 0x7F;
755 *q++ = 'M';
756 *q++ = '-';
757 }
758 if (isascii(c) && iscntrl(c)) {
759 if (c == '\n') {
760 *q++ = ' ';
761 } else if (c == '\t') {
762 *q++ = '\t';
763 } else {
764 *q++ = '^';
765 *q++ = c ^ 0100;
766 }
767 } else {
768 *q++ = c;
769 }
770 }
771 *q = '\0';
772
773 logmsg(pri, line, hname, flags);
774 }
775
776 /*
777 * Read /dev/klog while data are available, split into lines.
778 */
779 static void
780 readklog(void)
781 {
782 char *p, *q, line[MAXLINE + 1];
783 int len, i;
784
785 len = 0;
786 for (;;) {
787 i = read(fklog, line + len, MAXLINE - 1 - len);
788 if (i > 0) {
789 line[i + len] = '\0';
790 } else {
791 if (i < 0 && errno != EINTR && errno != EAGAIN) {
792 logerror("klog");
793 fklog = -1;
794 }
795 break;
796 }
797
798 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
799 *q = '\0';
800 printsys(p);
801 }
802 len = strlen(p);
803 if (len >= MAXLINE - 1) {
804 printsys(p);
805 len = 0;
806 }
807 if (len > 0)
808 memmove(line, p, len + 1);
809 }
810 if (len > 0)
811 printsys(line);
812 }
813
814 /*
815 * Take a raw input line from /dev/klog, format similar to syslog().
816 */
817 static void
818 printsys(char *msg)
819 {
820 char *p, *q;
821 long n;
822 int flags, isprintf, pri;
823
824 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */
825 p = msg;
826 pri = DEFSPRI;
827 isprintf = 1;
828 if (*p == '<') {
829 errno = 0;
830 n = strtol(p + 1, &q, 10);
831 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
832 p = q + 1;
833 pri = n;
834 isprintf = 0;
835 }
836 }
837 /*
838 * Kernel printf's and LOG_CONSOLE messages have been displayed
839 * on the console already.
840 */
841 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
842 flags |= IGN_CONS;
843 if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
844 pri = DEFSPRI;
845 logmsg(pri, p, LocalHostName, flags);
846 }
847
848 static time_t now;
849
850 /*
851 * Match a program or host name against a specification.
852 * Return a non-0 value if the message must be ignored
853 * based on the specification.
854 */
855 static int
856 skip_message(const char *name, const char *spec, int checkcase)
857 {
858 const char *s;
859 char prev, next;
860 int exclude = 0;
861 /* Behaviour on explicit match */
862
863 if (spec == NULL)
864 return 0;
865 switch (*spec) {
866 case '-':
867 exclude = 1;
868 /*FALLTHROUGH*/
869 case '+':
870 spec++;
871 break;
872 default:
873 break;
874 }
875 if (checkcase)
876 s = strstr (spec, name);
877 else
878 s = strcasestr (spec, name);
879
880 if (s != NULL) {
881 prev = (s == spec ? ',' : *(s - 1));
882 next = *(s + strlen (name));
883
884 if (prev == ',' && (next == '\0' || next == ','))
885 /* Explicit match: skip iff the spec is an
886 exclusive one. */
887 return exclude;
888 }
889
890 /* No explicit match for this name: skip the message iff
891 the spec is an inclusive one. */
892 return !exclude;
893 }
894
895 /*
896 * Log a message to the appropriate log files, users, etc. based on
897 * the priority.
898 */
899 static void
900 logmsg(int pri, const char *msg, const char *from, int flags)
901 {
902 struct filed *f;
903 int i, fac, msglen, omask, prilev;
904 const char *timestamp;
905 char prog[NAME_MAX+1];
906 char buf[MAXLINE+1];
907
908 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
909 pri, flags, from, msg);
910
911 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
912
913 /*
914 * Check to see if msg looks non-standard.
915 */
916 msglen = strlen(msg);
917 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
918 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
919 flags |= ADDDATE;
920
921 time(&now);
922 if (flags & ADDDATE) {
923 timestamp = ctime(&now) + 4;
924 } else {
925 timestamp = msg;
926 msg += 16;
927 msglen -= 16;
928 }
929
930 /* skip leading blanks */
931 while (isspace(*msg)) {
932 msg++;
933 msglen--;
934 }
935
936 /* extract facility and priority level */
937 if (flags & MARK)
938 fac = LOG_NFACILITIES;
939 else
940 fac = LOG_FAC(pri);
941
942 /* Check maximum facility number. */
943 if (fac > LOG_NFACILITIES) {
944 sigsetmask(omask);
945 return;
946 }
947
948 prilev = LOG_PRI(pri);
949
950 /* extract program name */
951 for (i = 0; i < NAME_MAX; i++) {
952 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
953 msg[i] == '/' || isspace(msg[i]))
954 break;
955 prog[i] = msg[i];
956 }
957 prog[i] = 0;
958
959 /* add kernel prefix for kernel messages */
960 if (flags & ISKERNEL) {
961 snprintf(buf, sizeof(buf), "%s: %s",
962 use_bootfile ? bootfile : "kernel", msg);
963 msg = buf;
964 msglen = strlen(buf);
965 }
966
967 /* log the message to the particular outputs */
968 if (!Initialized) {
969 f = &consfile;
970 /*
971 * Open in non-blocking mode to avoid hangs during open
972 * and close(waiting for the port to drain).
973 */
974 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
975
976 if (f->f_file >= 0) {
977 strlcpy(f->f_lasttime, timestamp,
978 sizeof(f->f_lasttime));
979 fprintlog(f, flags, msg);
980 close(f->f_file);
981 }
982 sigsetmask(omask);
983 return;
984 }
985 for (f = Files; f; f = f->f_next) {
986 /* skip messages that are incorrect priority */
987 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
988 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
989 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
990 )
991 || f->f_pmask[fac] == INTERNAL_NOPRI)
992 continue;
993
994 /* skip messages with the incorrect hostname */
995 if (skip_message(from, f->f_host, 0))
996 continue;
997
998 /* skip messages with the incorrect program name */
999 if (skip_message(prog, f->f_program, 1))
1000 continue;
1001
1002 /* skip message to console if it has already been printed */
1003 if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1004 continue;
1005
1006 /* don't output marks to recently written files */
1007 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1008 continue;
1009
1010 /*
1011 * suppress duplicate lines to this file
1012 */
1013 if (no_compress - (f->f_type != F_PIPE) < 1 &&
1014 (flags & MARK) == 0 && msglen == f->f_prevlen &&
1015 f->f_prevline && !strcmp(msg, f->f_prevline) &&
1016 !strcasecmp(from, f->f_prevhost)) {
1017 strlcpy(f->f_lasttime, timestamp,
1018 sizeof(f->f_lasttime));
1019 f->f_prevcount++;
1020 dprintf("msg repeated %d times, %ld sec of %d\n",
1021 f->f_prevcount, (long)(now - f->f_time),
1022 repeatinterval[f->f_repeatcount]);
1023 /*
1024 * If domark would have logged this by now,
1025 * flush it now (so we don't hold isolated messages),
1026 * but back off so we'll flush less often
1027 * in the future.
1028 */
1029 if (now > REPEATTIME(f)) {
1030 fprintlog(f, flags, NULL);
1031 BACKOFF(f);
1032 }
1033 } else {
1034 /* new line, save it */
1035 if (f->f_prevcount)
1036 fprintlog(f, 0, NULL);
1037 f->f_repeatcount = 0;
1038 f->f_prevpri = pri;
1039 strlcpy(f->f_lasttime, timestamp,
1040 sizeof(f->f_lasttime));
1041 strlcpy(f->f_prevhost, from, sizeof(f->f_prevhost));
1042 if (msglen < MAXSVLINE) {
1043 f->f_prevlen = msglen;
1044 strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
1045 fprintlog(f, flags, NULL);
1046 } else {
1047 f->f_prevline[0] = 0;
1048 f->f_prevlen = 0;
1049 fprintlog(f, flags, msg);
1050 }
1051 }
1052 }
1053 sigsetmask(omask);
1054 }
1055
1056 static void
1057 dofsync(void)
1058 {
1059 struct filed *f;
1060
1061 for (f = Files; f; f = f->f_next) {
1062 if ((f->f_type == F_FILE) &&
1063 (f->f_flags & FFLAG_NEEDSYNC)) {
1064 f->f_flags &= ~FFLAG_NEEDSYNC;
1065 fsync(f->f_file);
1066 }
1067 }
1068 }
1069
1070 #define IOV_SIZE 7
1071 static void
1072 fprintlog(struct filed *f, int flags, const char *msg)
1073 {
1074 struct iovec iov[IOV_SIZE];
1075 struct iovec *v;
1076 struct addrinfo *r;
1077 int i, l, lsent = 0;
1078 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
1079 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
1080 const char *msgret;
1081
1082 v = iov;
1083 if (f->f_type == F_WALL) {
1084 v->iov_base = greetings;
1085 /* The time displayed is not synchornized with the other log
1086 * destinations (like messages). Following fragment was using
1087 * ctime(&now), which was updating the time every 30 sec.
1088 * With f_lasttime, time is synchronized correctly.
1089 */
1090 v->iov_len = snprintf(greetings, sizeof greetings,
1091 "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
1092 f->f_prevhost, f->f_lasttime);
1093 if (v->iov_len > 0)
1094 v++;
1095 v->iov_base = nul;
1096 v->iov_len = 0;
1097 v++;
1098 } else {
1099 v->iov_base = f->f_lasttime;
1100 v->iov_len = strlen(f->f_lasttime);
1101 v++;
1102 v->iov_base = space;
1103 v->iov_len = 1;
1104 v++;
1105 }
1106
1107 if (LogFacPri) {
1108 static char fp_buf[30]; /* Hollow laugh */
1109 int fac = f->f_prevpri & LOG_FACMASK;
1110 int pri = LOG_PRI(f->f_prevpri);
1111 const char *f_s = NULL;
1112 char f_n[5]; /* Hollow laugh */
1113 const char *p_s = NULL;
1114 char p_n[5]; /* Hollow laugh */
1115
1116 if (LogFacPri > 1) {
1117 CODE *c;
1118
1119 for (c = facilitynames; c->c_name; c++) {
1120 if (c->c_val == fac) {
1121 f_s = c->c_name;
1122 break;
1123 }
1124 }
1125 for (c = prioritynames; c->c_name; c++) {
1126 if (c->c_val == pri) {
1127 p_s = c->c_name;
1128 break;
1129 }
1130 }
1131 }
1132 if (!f_s) {
1133 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1134 f_s = f_n;
1135 }
1136 if (!p_s) {
1137 snprintf(p_n, sizeof p_n, "%d", pri);
1138 p_s = p_n;
1139 }
1140 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
1141 v->iov_base = fp_buf;
1142 v->iov_len = strlen(fp_buf);
1143 } else {
1144 v->iov_base = nul;
1145 v->iov_len = 0;
1146 }
1147 v++;
1148
1149 v->iov_base = f->f_prevhost;
1150 v->iov_len = strlen(v->iov_base);
1151 v++;
1152 v->iov_base = space;
1153 v->iov_len = 1;
1154 v++;
1155
1156 if (msg) {
1157 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1158 if (wmsg == NULL) {
1159 logerror("strdup");
1160 exit(1);
1161 }
1162 v->iov_base = wmsg;
1163 v->iov_len = strlen(msg);
1164 } else if (f->f_prevcount > 1) {
1165 v->iov_base = repbuf;
1166 v->iov_len = snprintf(repbuf, sizeof repbuf,
1167 "last message repeated %d times", f->f_prevcount);
1168 } else if (f->f_prevline) {
1169 v->iov_base = f->f_prevline;
1170 v->iov_len = f->f_prevlen;
1171 } else {
1172 return;
1173 }
1174 v++;
1175
1176 dprintf("Logging to %s", TypeNames[f->f_type]);
1177 f->f_time = now;
1178
1179 switch (f->f_type) {
1180 int port;
1181 case F_UNUSED:
1182 dprintf("\n");
1183 break;
1184
1185 case F_FORW:
1186 port = (int)ntohs(((struct sockaddr_in *)
1187 (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1188 if (port != 514) {
1189 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port);
1190 } else {
1191 dprintf(" %s\n", f->f_un.f_forw.f_hname);
1192 }
1193 /* check for local vs remote messages */
1194 if (strcasecmp(f->f_prevhost, LocalHostName))
1195 l = snprintf(line, sizeof line - 1,
1196 "<%d>%.15s Forwarded from %s: %s",
1197 f->f_prevpri, (char *)iov[0].iov_base,
1198 f->f_prevhost, (char *)iov[5].iov_base);
1199 else
1200 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1201 f->f_prevpri, (char *)iov[0].iov_base,
1202 (char *)iov[5].iov_base);
1203 if (l < 0)
1204 l = 0;
1205 else if (l > MAXLINE)
1206 l = MAXLINE;
1207
1208 if (finet) {
1209 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1210 for (i = 0; i < *finet; i++) {
1211 #if 0
1212 /*
1213 * should we check AF first, or just
1214 * trial and error? FWD
1215 */
1216 if (r->ai_family ==
1217 address_family_of(finet[i+1]))
1218 #endif
1219 lsent = sendto(finet[i+1], line, l, 0,
1220 r->ai_addr, r->ai_addrlen);
1221 if (lsent == l)
1222 break;
1223 }
1224 if (lsent == l && !send_to_all)
1225 break;
1226 }
1227 dprintf("lsent/l: %d/%d\n", lsent, l);
1228 if (lsent != l) {
1229 int e = errno;
1230 logerror("sendto");
1231 errno = e;
1232 switch (errno) {
1233 case ENOBUFS:
1234 case ENETDOWN:
1235 case EHOSTUNREACH:
1236 case EHOSTDOWN:
1237 break;
1238 /* case EBADF: */
1239 /* case EACCES: */
1240 /* case ENOTSOCK: */
1241 /* case EFAULT: */
1242 /* case EMSGSIZE: */
1243 /* case EAGAIN: */
1244 /* case ENOBUFS: */
1245 /* case ECONNREFUSED: */
1246 default:
1247 dprintf("removing entry\n");
1248 f->f_type = F_UNUSED;
1249 break;
1250 }
1251 }
1252 }
1253 break;
1254
1255 case F_FILE:
1256 dprintf(" %s\n", f->f_un.f_fname);
1257 v->iov_base = lf;
1258 v->iov_len = 1;
1259 if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1260 /*
1261 * If writev(2) fails for potentially transient errors
1262 * like the filesystem being full, ignore it.
1263 * Otherwise remove this logfile from the list.
1264 */
1265 if (errno != ENOSPC) {
1266 int e = errno;
1267 close(f->f_file);
1268 f->f_type = F_UNUSED;
1269 errno = e;
1270 logerror(f->f_un.f_fname);
1271 }
1272 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1273 f->f_flags |= FFLAG_NEEDSYNC;
1274 needdofsync = 1;
1275 }
1276 break;
1277
1278 case F_RING:
1279 dprintf(" %s\n", f->f_un.f_ring.f_rname);
1280 v->iov_base = lf;
1281 v->iov_len = 1;
1282 if (rbwritev(f, iov, 7) == -1) {
1283 int e = errno;
1284 munmap(f->f_un.f_ring.f_footer,
1285 sizeof(struct clog_footer));
1286 close(f->f_file);
1287 f->f_type = F_UNUSED;
1288 errno = e;
1289 logerror(f->f_un.f_fname);
1290 }
1291 break;
1292
1293 case F_PIPE:
1294 dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1295 v->iov_base = lf;
1296 v->iov_len = 1;
1297 if (f->f_un.f_pipe.f_pid == 0) {
1298 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1299 &f->f_un.f_pipe.f_pid)) < 0) {
1300 f->f_type = F_UNUSED;
1301 logerror(f->f_un.f_pipe.f_pname);
1302 break;
1303 }
1304 }
1305 if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1306 int e = errno;
1307 close(f->f_file);
1308 if (f->f_un.f_pipe.f_pid > 0)
1309 deadq_enter(f->f_un.f_pipe.f_pid,
1310 f->f_un.f_pipe.f_pname);
1311 f->f_un.f_pipe.f_pid = 0;
1312 errno = e;
1313 logerror(f->f_un.f_pipe.f_pname);
1314 }
1315 break;
1316
1317 case F_CONSOLE:
1318 if (flags & IGN_CONS) {
1319 dprintf(" (ignored)\n");
1320 break;
1321 }
1322 /* FALLTHROUGH */
1323
1324 case F_TTY:
1325 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1326 v->iov_base = crlf;
1327 v->iov_len = 2;
1328
1329 errno = 0; /* ttymsg() only sometimes returns an errno */
1330 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) {
1331 f->f_type = F_UNUSED;
1332 logerror(msgret);
1333 }
1334 break;
1335
1336 case F_USERS:
1337 case F_WALL:
1338 dprintf("\n");
1339 v->iov_base = crlf;
1340 v->iov_len = 2;
1341 wallmsg(f, iov, IOV_SIZE);
1342 break;
1343 }
1344 f->f_prevcount = 0;
1345 free(wmsg);
1346 }
1347
1348 /*
1349 * WALLMSG -- Write a message to the world at large
1350 *
1351 * Write the specified message to either the entire
1352 * world, or a list of approved users.
1353 */
1354 static void
1355 wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1356 {
1357 static int reenter; /* avoid calling ourselves */
1358
1359 struct utmpentry *ep;
1360 int i;
1361 const char *p;
1362
1363 if (reenter++)
1364 return;
1365
1366 getutentries(NULL, &ep);
1367 if (ep == NULL) {
1368 logerror("getutentries");
1369 reenter = 0;
1370 return;
1371 }
1372 /* NOSTRICT */
1373 for (; ep; ep = ep->next) {
1374 /* We must use strncpy since ut_* may not be NUL terminated. */
1375 if (f->f_type == F_WALL) {
1376 if ((p = ttymsg(iov, iovlen, ep->line, TTYMSGTIME)) !=
1377 NULL) {
1378 errno = 0; /* already in msg */
1379 logerror(p);
1380 }
1381 continue;
1382 }
1383 /* should we send the message to this user? */
1384 for (i = 0; i < MAXUNAMES; i++) {
1385 if (!f->f_un.f_uname[i][0])
1386 break;
1387 if (!strcmp(f->f_un.f_uname[i], ep->name)) {
1388 if ((p = ttymsg(iov, iovlen, ep->line, TTYMSGTIME))
1389 != NULL) {
1390 errno = 0; /* already in msg */
1391 logerror(p);
1392 }
1393 break;
1394 }
1395 }
1396 }
1397 reenter = 0;
1398 }
1399
1400 static void
1401 reapchild(int signo __unused)
1402 {
1403 int status;
1404 pid_t pid;
1405 struct filed *f;
1406
1407 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) {
1408 if (!Initialized)
1409 /* Don't tell while we are initting. */
1410 continue;
1411
1412 /* First, look if it's a process from the dead queue. */
1413 if (deadq_remove(pid))
1414 goto oncemore;
1415
1416 /* Now, look in list of active processes. */
1417 for (f = Files; f; f = f->f_next)
1418 if (f->f_type == F_PIPE &&
1419 f->f_un.f_pipe.f_pid == pid) {
1420 close(f->f_file);
1421 f->f_un.f_pipe.f_pid = 0;
1422 log_deadchild(pid, status,
1423 f->f_un.f_pipe.f_pname);
1424 break;
1425 }
1426 oncemore:
1427 continue;
1428 }
1429 }
1430
1431 /*
1432 * Return a printable representation of a host address.
1433 */
1434 static const char *
1435 cvthname(struct sockaddr *f)
1436 {
1437 int error, hl;
1438 sigset_t omask, nmask;
1439 static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1440
1441 error = getnameinfo((struct sockaddr *)f,
1442 ((struct sockaddr *)f)->sa_len,
1443 ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
1444 dprintf("cvthname(%s)\n", ip);
1445
1446 if (error) {
1447 dprintf("Malformed from address %s\n", gai_strerror(error));
1448 return ("???");
1449 }
1450 if (!resolve)
1451 return (ip);
1452
1453 sigemptyset(&nmask);
1454 sigaddset(&nmask, SIGHUP);
1455 sigprocmask(SIG_BLOCK, &nmask, &omask);
1456 error = getnameinfo((struct sockaddr *)f,
1457 ((struct sockaddr *)f)->sa_len,
1458 hname, sizeof hname, NULL, 0, NI_NAMEREQD);
1459 sigprocmask(SIG_SETMASK, &omask, NULL);
1460 if (error) {
1461 dprintf("Host name for your address (%s) unknown\n", ip);
1462 return (ip);
1463 }
1464 hl = strlen(hname);
1465 if (hl > 0 && hname[hl-1] == '.')
1466 hname[--hl] = '\0';
1467 trimdomain(hname, hl);
1468 return (hname);
1469 }
1470
1471 static void
1472 dodie(int signo)
1473 {
1474
1475 WantDie = signo;
1476 }
1477
1478 static void
1479 domark(int signo __unused)
1480 {
1481
1482 MarkSet = 1;
1483 }
1484
1485 /*
1486 * Print syslogd errors some place.
1487 */
1488 static void
1489 logerror(const char *type)
1490 {
1491 char buf[512];
1492 static int recursed = 0;
1493
1494 /* If there's an error while trying to log an error, give up. */
1495 if (recursed)
1496 return;
1497 recursed++;
1498 if (errno)
1499 snprintf(buf,
1500 sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1501 else
1502 snprintf(buf, sizeof buf, "syslogd: %s", type);
1503 errno = 0;
1504 dprintf("%s\n", buf);
1505 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1506 recursed--;
1507 }
1508
1509 static void
1510 die(int signo)
1511 {
1512 struct filed *f;
1513 struct funix *fx;
1514 int was_initialized;
1515 char buf[100];
1516
1517 was_initialized = Initialized;
1518 Initialized = 0; /* Don't log SIGCHLDs. */
1519 for (f = Files; f != NULL; f = f->f_next) {
1520 /* flush any pending output */
1521 if (f->f_prevcount)
1522 fprintlog(f, 0, NULL);
1523 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) {
1524 close(f->f_file);
1525 f->f_un.f_pipe.f_pid = 0;
1526 }
1527 }
1528 Initialized = was_initialized;
1529 if (signo) {
1530 dprintf("syslogd: exiting on signal %d\n", signo);
1531 snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1532 errno = 0;
1533 logerror(buf);
1534 }
1535 STAILQ_FOREACH(fx, &funixes, next)
1536 unlink(fx->name);
1537 pidfile_remove(pfh);
1538
1539 exit(1);
1540 }
1541
1542 /*
1543 * INIT -- Initialize syslogd from configuration table
1544 */
1545 static void
1546 init(int signo)
1547 {
1548 int i;
1549 FILE *cf;
1550 struct filed *f, *next, **nextp;
1551 char *p;
1552 char cline[LINE_MAX];
1553 char prog[NAME_MAX+1];
1554 char host[MAXHOSTNAMELEN];
1555 char oldLocalHostName[MAXHOSTNAMELEN];
1556 char hostMsg[2*MAXHOSTNAMELEN+40];
1557 char bootfileMsg[LINE_MAX];
1558
1559 dprintf("init\n");
1560
1561 /*
1562 * Load hostname (may have changed).
1563 */
1564 if (signo != 0)
1565 strlcpy(oldLocalHostName, LocalHostName,
1566 sizeof(oldLocalHostName));
1567 if (gethostname(LocalHostName, sizeof(LocalHostName)))
1568 err(EX_OSERR, "gethostname() failed");
1569 if ((p = strchr(LocalHostName, '.')) != NULL) {
1570 *p++ = '\0';
1571 LocalDomain = p;
1572 } else {
1573 LocalDomain = "";
1574 }
1575
1576 /*
1577 * Close all open log files.
1578 */
1579 Initialized = 0;
1580 for (f = Files; f != NULL; f = next) {
1581 /* flush any pending output */
1582 if (f->f_prevcount)
1583 fprintlog(f, 0, NULL);
1584
1585 switch (f->f_type) {
1586 case F_FILE:
1587 case F_FORW:
1588 case F_CONSOLE:
1589 case F_TTY:
1590 close(f->f_file);
1591 break;
1592 case F_PIPE:
1593 if (f->f_un.f_pipe.f_pid > 0) {
1594 close(f->f_file);
1595 deadq_enter(f->f_un.f_pipe.f_pid,
1596 f->f_un.f_pipe.f_pname);
1597 }
1598 f->f_un.f_pipe.f_pid = 0;
1599 break;
1600 case F_RING:
1601 munmap(f->f_un.f_ring.f_footer,
1602 sizeof(struct clog_footer));
1603 close(f->f_file);
1604 break;
1605 }
1606 next = f->f_next;
1607 if (f->f_program) free(f->f_program);
1608 if (f->f_host) free(f->f_host);
1609 free((char *)f);
1610 }
1611 Files = NULL;
1612 nextp = &Files;
1613
1614 /* open the configuration file */
1615 if ((cf = fopen(ConfFile, "r")) == NULL) {
1616 dprintf("cannot open %s\n", ConfFile);
1617 *nextp = (struct filed *)calloc(1, sizeof(*f));
1618 if (*nextp == NULL) {
1619 logerror("calloc");
1620 exit(1);
1621 }
1622 cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1623 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1624 if ((*nextp)->f_next == NULL) {
1625 logerror("calloc");
1626 exit(1);
1627 }
1628 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1629 Initialized = 1;
1630 return;
1631 }
1632
1633 /*
1634 * Foreach line in the conf table, open that file.
1635 */
1636 f = NULL;
1637 strlcpy(host, "*", sizeof(host));
1638 strlcpy(prog, "*", sizeof(prog));
1639 while (fgets(cline, sizeof(cline), cf) != NULL) {
1640 /*
1641 * check for end-of-section, comments, strip off trailing
1642 * spaces and newline character. #!prog is treated specially:
1643 * following lines apply only to that program.
1644 */
1645 for (p = cline; isspace(*p); ++p)
1646 continue;
1647 if (*p == 0)
1648 continue;
1649 if (*p == '#') {
1650 p++;
1651 if (*p != '!' && *p != '+' && *p != '-')
1652 continue;
1653 }
1654 if (*p == '+' || *p == '-') {
1655 host[0] = *p++;
1656 while (isspace(*p))
1657 p++;
1658 if ((!*p) || (*p == '*')) {
1659 strlcpy(host, "*", sizeof(host));
1660 continue;
1661 }
1662 if (*p == '@')
1663 p = LocalHostName;
1664 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1665 if (!isalnum(*p) && *p != '.' && *p != '-'
1666 && *p != ',' && *p != ':' && *p != '%')
1667 break;
1668 host[i] = *p++;
1669 }
1670 host[i] = '\0';
1671 continue;
1672 }
1673 if (*p == '!') {
1674 p++;
1675 while (isspace(*p)) p++;
1676 if ((!*p) || (*p == '*')) {
1677 strlcpy(prog, "*", sizeof(prog));
1678 continue;
1679 }
1680 for (i = 0; i < NAME_MAX; i++) {
1681 if (!isprint(p[i]) || isspace(p[i]))
1682 break;
1683 prog[i] = p[i];
1684 }
1685 prog[i] = 0;
1686 continue;
1687 }
1688 for (p = cline + 1; *p != '\0'; p++) {
1689 if (*p != '#')
1690 continue;
1691 if (*(p - 1) == '\\') {
1692 strcpy(p - 1, p);
1693 p--;
1694 continue;
1695 }
1696 *p = '\0';
1697 break;
1698 }
1699 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1700 cline[i] = '\0';
1701 f = (struct filed *)calloc(1, sizeof(*f));
1702 if (f == NULL) {
1703 logerror("calloc");
1704 exit(1);
1705 }
1706 *nextp = f;
1707 nextp = &f->f_next;
1708 cfline(cline, f, prog, host);
1709 }
1710
1711 /* close the configuration file */
1712 fclose(cf);
1713
1714 Initialized = 1;
1715
1716 if (Debug) {
1717 int port;
1718 for (f = Files; f; f = f->f_next) {
1719 for (i = 0; i <= LOG_NFACILITIES; i++)
1720 if (f->f_pmask[i] == INTERNAL_NOPRI)
1721 printf("X ");
1722 else
1723 printf("%d ", f->f_pmask[i]);
1724 printf("%s: ", TypeNames[f->f_type]);
1725 switch (f->f_type) {
1726 case F_FILE:
1727 printf("%s", f->f_un.f_fname);
1728 break;
1729
1730 case F_CONSOLE:
1731 case F_TTY:
1732 printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1733 break;
1734
1735 case F_FORW:
1736 port = (int)ntohs(((struct sockaddr_in *)
1737 (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1738 if (port != 514) {
1739 printf("%s:%d",
1740 f->f_un.f_forw.f_hname, port);
1741 } else {
1742 printf("%s", f->f_un.f_forw.f_hname);
1743 }
1744 break;
1745
1746 case F_RING:
1747 printf("%s", f->f_un.f_ring.f_rname);
1748 break;
1749
1750 case F_PIPE:
1751 printf("%s", f->f_un.f_pipe.f_pname);
1752 break;
1753
1754 case F_USERS:
1755 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1756 printf("%s, ", f->f_un.f_uname[i]);
1757 break;
1758 }
1759 if (f->f_program)
1760 printf(" (%s)", f->f_program);
1761 printf("\n");
1762 }
1763 }
1764
1765 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1766 dprintf("syslogd: restarted\n");
1767 /*
1768 * Log a change in hostname, but only on a restart.
1769 */
1770 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1771 snprintf(hostMsg, sizeof(hostMsg),
1772 "syslogd: hostname changed, \"%s\" to \"%s\"",
1773 oldLocalHostName, LocalHostName);
1774 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1775 dprintf("%s\n", hostMsg);
1776 }
1777 /*
1778 * Log the kernel boot file if we aren't going to use it as
1779 * the prefix, and if this is *not* a restart.
1780 */
1781 if (signo == 0 && !use_bootfile) {
1782 snprintf(bootfileMsg, sizeof(bootfileMsg),
1783 "syslogd: kernel boot file is %s", bootfile);
1784 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1785 dprintf("%s\n", bootfileMsg);
1786 }
1787 }
1788
1789 /*
1790 * Crack a configuration file line
1791 */
1792 static void
1793 cfline(const char *line, struct filed *f, const char *prog, const char *host)
1794 {
1795 struct addrinfo hints, *res;
1796 int error, i, pri, syncfile;
1797 const char *p, *q;
1798 char *bp;
1799 char buf[MAXLINE], ebuf[100];
1800 struct stat sb;
1801
1802 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1803
1804 errno = 0; /* keep strerror() stuff out of logerror messages */
1805
1806 /* clear out file entry */
1807 memset(f, 0, sizeof(*f));
1808 for (i = 0; i <= LOG_NFACILITIES; i++)
1809 f->f_pmask[i] = INTERNAL_NOPRI;
1810
1811 /* save hostname if any */
1812 if (host && *host == '*')
1813 host = NULL;
1814 if (host) {
1815 int hl;
1816
1817 f->f_host = strdup(host);
1818 if (f->f_host == NULL) {
1819 logerror("strdup");
1820 exit(1);
1821 }
1822 hl = strlen(f->f_host);
1823 if (hl > 0 && f->f_host[hl-1] == '.')
1824 f->f_host[--hl] = '\0';
1825 trimdomain(f->f_host, hl);
1826 }
1827
1828 /* save program name if any */
1829 if (prog && *prog == '*')
1830 prog = NULL;
1831 if (prog) {
1832 f->f_program = strdup(prog);
1833 if (f->f_program == NULL) {
1834 logerror("strdup");
1835 exit(1);
1836 }
1837 }
1838
1839 /* scan through the list of selectors */
1840 for (p = line; *p && *p != '\t' && *p != ' ';) {
1841 int pri_done;
1842 int pri_cmp;
1843 int pri_invert;
1844
1845 /* find the end of this facility name list */
1846 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1847 continue;
1848
1849 /* get the priority comparison */
1850 pri_cmp = 0;
1851 pri_done = 0;
1852 pri_invert = 0;
1853 if (*q == '!') {
1854 pri_invert = 1;
1855 q++;
1856 }
1857 while (!pri_done) {
1858 switch (*q) {
1859 case '<':
1860 pri_cmp |= PRI_LT;
1861 q++;
1862 break;
1863 case '=':
1864 pri_cmp |= PRI_EQ;
1865 q++;
1866 break;
1867 case '>':
1868 pri_cmp |= PRI_GT;
1869 q++;
1870 break;
1871 default:
1872 pri_done++;
1873 break;
1874 }
1875 }
1876
1877 /* collect priority name */
1878 for (bp = buf; *q && !strchr("\t,; ", *q); )
1879 *bp++ = *q++;
1880 *bp = '\0';
1881
1882 /* skip cruft */
1883 while (strchr(",;", *q))
1884 q++;
1885
1886 /* decode priority name */
1887 if (*buf == '*') {
1888 pri = LOG_PRIMASK;
1889 pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1890 } else {
1891 /* Ignore trailing spaces. */
1892 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
1893 buf[i] = '\0';
1894
1895 pri = decode(buf, prioritynames);
1896 if (pri < 0) {
1897 snprintf(ebuf, sizeof ebuf,
1898 "unknown priority name \"%s\"", buf);
1899 logerror(ebuf);
1900 return;
1901 }
1902 }
1903 if (!pri_cmp)
1904 pri_cmp = (UniquePriority)
1905 ? (PRI_EQ)
1906 : (PRI_EQ | PRI_GT)
1907 ;
1908 if (pri_invert)
1909 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
1910
1911 /* scan facilities */
1912 while (*p && !strchr("\t.; ", *p)) {
1913 for (bp = buf; *p && !strchr("\t,;. ", *p); )
1914 *bp++ = *p++;
1915 *bp = '\0';
1916
1917 if (*buf == '*') {
1918 for (i = 0; i < LOG_NFACILITIES; i++) {
1919 f->f_pmask[i] = pri;
1920 f->f_pcmp[i] = pri_cmp;
1921 }
1922 } else {
1923 i = decode(buf, facilitynames);
1924 if (i < 0) {
1925 snprintf(ebuf, sizeof ebuf,
1926 "unknown facility name \"%s\"",
1927 buf);
1928 logerror(ebuf);
1929 return;
1930 }
1931 f->f_pmask[i >> 3] = pri;
1932 f->f_pcmp[i >> 3] = pri_cmp;
1933 }
1934 while (*p == ',' || *p == ' ')
1935 p++;
1936 }
1937
1938 p = q;
1939 }
1940
1941 /* skip to action part */
1942 while (*p == '\t' || *p == ' ')
1943 p++;
1944
1945 if (*p == '-') {
1946 syncfile = 0;
1947 p++;
1948 } else
1949 syncfile = 1;
1950
1951 switch (*p) {
1952 case '@':
1953 {
1954 char *tp;
1955 /*
1956 * scan forward to see if there is a port defined.
1957 * so we can't use strlcpy..
1958 */
1959 i = sizeof(f->f_un.f_forw.f_hname);
1960 tp = f->f_un.f_forw.f_hname;
1961 p++;
1962
1963 while (*p && (*p != ':') && (i-- > 0)) {
1964 *tp++ = *p++;
1965 }
1966 *tp = '\0';
1967 }
1968 /* See if we copied a domain and have a port */
1969 if (*p == ':')
1970 p++;
1971 else
1972 p = NULL;
1973
1974 memset(&hints, 0, sizeof(hints));
1975 hints.ai_family = family;
1976 hints.ai_socktype = SOCK_DGRAM;
1977 error = getaddrinfo(f->f_un.f_forw.f_hname,
1978 p ? p : "syslog", &hints, &res);
1979 if (error) {
1980 logerror(gai_strerror(error));
1981 break;
1982 }
1983 f->f_un.f_forw.f_addr = res;
1984 f->f_type = F_FORW;
1985 break;
1986
1987 case '/':
1988 if ((f->f_file = open(p, logflags, 0600)) < 0) {
1989 f->f_type = F_UNUSED;
1990 logerror(p);
1991 break;
1992 }
1993 if (syncfile)
1994 f->f_flags |= FFLAG_SYNC;
1995 if (isatty(f->f_file)) {
1996 if (strcmp(p, ctty) == 0)
1997 f->f_type = F_CONSOLE;
1998 else
1999 f->f_type = F_TTY;
2000 strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
2001 sizeof(f->f_un.f_fname));
2002 } else {
2003 strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
2004 f->f_type = F_FILE;
2005 }
2006 break;
2007
2008 case '%':
2009 if ((f->f_file = open(p + 1, O_RDWR, 0 )) < 0) {
2010 f->f_type = F_UNUSED;
2011 logerror(p + 1);
2012 break;
2013 }
2014 if (fstat(f->f_file,&sb) < 0) {
2015 close(f->f_file);
2016 f->f_type = F_UNUSED;
2017 logerror(p+1);
2018 break;
2019 }
2020 f->f_un.f_ring.f_footer =
2021 mmap(NULL, sizeof(struct clog_footer),
2022 PROT_READ|PROT_WRITE, MAP_SHARED,
2023 f->f_file, sb.st_size-sizeof(struct clog_footer));
2024 if (f->f_un.f_ring.f_footer == NULL) {
2025 close(f->f_file);
2026 f->f_type = F_UNUSED;
2027 logerror(p + 1);
2028 break;
2029 }
2030 if (memcmp(&(f->f_un.f_ring.f_footer->cf_magic), MAGIC_CONST, 4) != 0) {
2031 munmap(f->f_un.f_ring.f_footer,
2032 sizeof(struct clog_footer));
2033 close(f->f_file);
2034 f->f_type = F_UNUSED;
2035 errno = ENODEV;
2036 logerror(p + 1);
2037 break;
2038 }
2039 f->f_un.f_ring.f_size = sb.st_size;
2040 strcpy(f->f_un.f_ring.f_rname, p + 1);
2041 f->f_type = F_RING;
2042 break;
2043
2044 case '|':
2045 f->f_un.f_pipe.f_pid = 0;
2046 strlcpy(f->f_un.f_pipe.f_pname, p + 1,
2047 sizeof(f->f_un.f_pipe.f_pname));
2048 f->f_type = F_PIPE;
2049 break;
2050
2051 case '*':
2052 f->f_type = F_WALL;
2053 break;
2054
2055 default:
2056 for (i = 0; i < MAXUNAMES && *p; i++) {
2057 for (q = p; *q && *q != ','; )
2058 q++;
2059 strncpy(f->f_un.f_uname[i], p, 32);
2060 if ((q - p) > 32)
2061 f->f_un.f_uname[i][32] = '\0';
2062 else
2063 f->f_un.f_uname[i][q - p] = '\0';
2064 while (*q == ',' || *q == ' ')
2065 q++;
2066 p = q;
2067 }
2068 f->f_type = F_USERS;
2069 break;
2070 }
2071 }
2072
2073
2074 /*
2075 * Decode a symbolic name to a numeric value
2076 */
2077 static int
2078 decode(const char *name, CODE *codetab)
2079 {
2080 CODE *c;
2081 char *p, buf[40];
2082
2083 if (isdigit(*name))
2084 return (atoi(name));
2085
2086 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2087 if (isupper(*name))
2088 *p = tolower(*name);
2089 else
2090 *p = *name;
2091 }
2092 *p = '\0';
2093 for (c = codetab; c->c_name; c++)
2094 if (!strcmp(buf, c->c_name))
2095 return (c->c_val);
2096
2097 return (-1);
2098 }
2099
2100 static void
2101 markit(void)
2102 {
2103 struct filed *f;
2104 dq_t q, next;
2105
2106 now = time(NULL);
2107 MarkSeq += TIMERINTVL;
2108 if (MarkSeq >= MarkInterval) {
2109 logmsg(LOG_INFO, "-- MARK --",
2110 LocalHostName, ADDDATE|MARK);
2111 MarkSeq = 0;
2112 }
2113
2114 for (f = Files; f; f = f->f_next) {
2115 if (f->f_prevcount && now >= REPEATTIME(f)) {
2116 dprintf("flush %s: repeated %d times, %d sec.\n",
2117 TypeNames[f->f_type], f->f_prevcount,
2118 repeatinterval[f->f_repeatcount]);
2119 fprintlog(f, 0, NULL);
2120 BACKOFF(f);
2121 }
2122 }
2123
2124 /* Walk the dead queue, and see if we should signal somebody. */
2125 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2126 next = TAILQ_NEXT(q, dq_entries);
2127
2128 switch (q->dq_timeout) {
2129 case 0:
2130 /* Already signalled once, try harder now. */
2131 if (kill(q->dq_pid, SIGKILL) != 0)
2132 deadq_remove(q->dq_pid);
2133 break;
2134
2135 case 1:
2136 /*
2137 * Timed out on dead queue, send terminate
2138 * signal. Note that we leave the removal
2139 * from the dead queue to reapchild(), which
2140 * will also log the event (unless the process
2141 * didn't even really exist, in case we simply
2142 * drop it from the dead queue).
2143 */
2144 if (kill(q->dq_pid, SIGTERM) != 0)
2145 deadq_remove(q->dq_pid);
2146 /* FALLTHROUGH */
2147
2148 default:
2149 q->dq_timeout--;
2150 }
2151 }
2152 MarkSet = 0;
2153 alarm(TIMERINTVL);
2154 }
2155
2156 /*
2157 * fork off and become a daemon, but wait for the child to come online
2158 * before returing to the parent, or we get disk thrashing at boot etc.
2159 * Set a timer so we don't hang forever if it wedges.
2160 */
2161 static int
2162 waitdaemon(int nochdir, int noclose, int maxwait)
2163 {
2164 int fd;
2165 int status;
2166 pid_t pid, childpid;
2167
2168 switch (childpid = fork()) {
2169 case -1:
2170 return (-1);
2171 case 0:
2172 break;
2173 default:
2174 signal(SIGALRM, timedout);
2175 alarm(maxwait);
2176 while ((pid = wait3(&status, 0, NULL)) != -1) {
2177 if (WIFEXITED(status))
2178 errx(1, "child pid %d exited with return code %d",
2179 pid, WEXITSTATUS(status));
2180 if (WIFSIGNALED(status))
2181 errx(1, "child pid %d exited on signal %d%s",
2182 pid, WTERMSIG(status),
2183 WCOREDUMP(status) ? " (core dumped)" :
2184 "");
2185 if (pid == childpid) /* it's gone... */
2186 break;
2187 }
2188 exit(0);
2189 }
2190
2191 if (setsid() == -1)
2192 return (-1);
2193
2194 if (!nochdir)
2195 chdir("/");
2196
2197 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2198 dup2(fd, STDIN_FILENO);
2199 dup2(fd, STDOUT_FILENO);
2200 dup2(fd, STDERR_FILENO);
2201 if (fd > 2)
2202 close (fd);
2203 }
2204 return (getppid());
2205 }
2206
2207 /*
2208 * We get a SIGALRM from the child when it's running and finished doing it's
2209 * fsync()'s or O_SYNC writes for all the boot messages.
2210 *
2211 * We also get a signal from the kernel if the timer expires, so check to
2212 * see what happened.
2213 */
2214 static void
2215 timedout(int sig __unused)
2216 {
2217 int left;
2218 left = alarm(0);
2219 signal(SIGALRM, SIG_DFL);
2220 if (left == 0)
2221 errx(1, "timed out waiting for child");
2222 else
2223 _exit(0);
2224 }
2225
2226 /*
2227 * Add `s' to the list of allowable peer addresses to accept messages
2228 * from.
2229 *
2230 * `s' is a string in the form:
2231 *
2232 * [*]domainname[:{servicename|portnumber|*}]
2233 *
2234 * or
2235 *
2236 * netaddr/maskbits[:{servicename|portnumber|*}]
2237 *
2238 * Returns -1 on error, 0 if the argument was valid.
2239 */
2240 static int
2241 allowaddr(char *s)
2242 {
2243 char *cp1, *cp2;
2244 struct allowedpeer ap;
2245 struct servent *se;
2246 int masklen = -1;
2247 struct addrinfo hints, *res;
2248 struct in_addr *addrp, *maskp;
2249 #ifdef INET6
2250 int i;
2251 u_int32_t *addr6p, *mask6p;
2252 #endif
2253 char ip[NI_MAXHOST];
2254
2255 #ifdef INET6
2256 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2257 #endif
2258 cp1 = s;
2259 if ((cp1 = strrchr(cp1, ':'))) {
2260 /* service/port provided */
2261 *cp1++ = '\0';
2262 if (strlen(cp1) == 1 && *cp1 == '*')
2263 /* any port allowed */
2264 ap.port = 0;
2265 else if ((se = getservbyname(cp1, "udp"))) {
2266 ap.port = ntohs(se->s_port);
2267 } else {
2268 ap.port = strtol(cp1, &cp2, 0);
2269 if (*cp2 != '\0')
2270 return (-1); /* port not numeric */
2271 }
2272 } else {
2273 if ((se = getservbyname("syslog", "udp")))
2274 ap.port = ntohs(se->s_port);
2275 else
2276 /* sanity, should not happen */
2277 ap.port = 514;
2278 }
2279
2280 if ((cp1 = strchr(s, '/')) != NULL &&
2281 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2282 *cp1 = '\0';
2283 if ((masklen = atoi(cp1 + 1)) < 0)
2284 return (-1);
2285 }
2286 #ifdef INET6
2287 if (*s == '[') {
2288 cp2 = s + strlen(s) - 1;
2289 if (*cp2 == ']') {
2290 ++s;
2291 *cp2 = '\0';
2292 } else {
2293 cp2 = NULL;
2294 }
2295 } else {
2296 cp2 = NULL;
2297 }
2298 #endif
2299 memset(&hints, 0, sizeof(hints));
2300 hints.ai_family = PF_UNSPEC;
2301 hints.ai_socktype = SOCK_DGRAM;
2302 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2303 if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2304 ap.isnumeric = 1;
2305 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2306 memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2307 ap.a_mask.ss_family = res->ai_family;
2308 if (res->ai_family == AF_INET) {
2309 ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2310 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2311 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2312 if (masklen < 0) {
2313 /* use default netmask */
2314 if (IN_CLASSA(ntohl(addrp->s_addr)))
2315 maskp->s_addr = htonl(IN_CLASSA_NET);
2316 else if (IN_CLASSB(ntohl(addrp->s_addr)))
2317 maskp->s_addr = htonl(IN_CLASSB_NET);
2318 else
2319 maskp->s_addr = htonl(IN_CLASSC_NET);
2320 } else if (masklen <= 32) {
2321 /* convert masklen to netmask */
2322 if (masklen == 0)
2323 maskp->s_addr = 0;
2324 else
2325 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2326 } else {
2327 freeaddrinfo(res);
2328 return (-1);
2329 }
2330 /* Lose any host bits in the network number. */
2331 addrp->s_addr &= maskp->s_addr;
2332 }
2333 #ifdef INET6
2334 else if (res->ai_family == AF_INET6 && masklen <= 128) {
2335 ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2336 if (masklen < 0)
2337 masklen = 128;
2338 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2339 /* convert masklen to netmask */
2340 while (masklen > 0) {
2341 if (masklen < 32) {
2342 *mask6p = htonl(~(0xffffffff >> masklen));
2343 break;
2344 }
2345 *mask6p++ = 0xffffffff;
2346 masklen -= 32;
2347 }
2348 /* Lose any host bits in the network number. */
2349 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2350 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2351 for (i = 0; i < 4; i++)
2352 addr6p[i] &= mask6p[i];
2353 }
2354 #endif
2355 else {
2356 freeaddrinfo(res);
2357 return (-1);
2358 }
2359 freeaddrinfo(res);
2360 } else {
2361 /* arg `s' is domain name */
2362 ap.isnumeric = 0;
2363 ap.a_name = s;
2364 if (cp1)
2365 *cp1 = '/';
2366 #ifdef INET6
2367 if (cp2) {
2368 *cp2 = ']';
2369 --s;
2370 }
2371 #endif
2372 }
2373
2374 if (Debug) {
2375 printf("allowaddr: rule %d: ", NumAllowed);
2376 if (ap.isnumeric) {
2377 printf("numeric, ");
2378 getnameinfo((struct sockaddr *)&ap.a_addr,
2379 ((struct sockaddr *)&ap.a_addr)->sa_len,
2380 ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2381 printf("addr = %s, ", ip);
2382 getnameinfo((struct sockaddr *)&ap.a_mask,
2383 ((struct sockaddr *)&ap.a_mask)->sa_len,
2384 ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2385 printf("mask = %s; ", ip);
2386 } else {
2387 printf("domainname = %s; ", ap.a_name);
2388 }
2389 printf("port = %d\n", ap.port);
2390 }
2391
2392 if ((AllowedPeers = realloc(AllowedPeers,
2393 ++NumAllowed * sizeof(struct allowedpeer)))
2394 == NULL) {
2395 logerror("realloc");
2396 exit(1);
2397 }
2398 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2399 return (0);
2400 }
2401
2402 /*
2403 * Validate that the remote peer has permission to log to us.
2404 */
2405 static int
2406 validate(struct sockaddr *sa, const char *hname)
2407 {
2408 int i;
2409 size_t l1, l2;
2410 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2411 struct allowedpeer *ap;
2412 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2413 #ifdef INET6
2414 int j, reject;
2415 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2416 #endif
2417 struct addrinfo hints, *res;
2418 u_short sport;
2419
2420 if (NumAllowed == 0)
2421 /* traditional behaviour, allow everything */
2422 return (1);
2423
2424 strlcpy(name, hname, sizeof(name));
2425 memset(&hints, 0, sizeof(hints));
2426 hints.ai_family = PF_UNSPEC;
2427 hints.ai_socktype = SOCK_DGRAM;
2428 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2429 if (getaddrinfo(name, NULL, &hints, &res) == 0)
2430 freeaddrinfo(res);
2431 else if (strchr(name, '.') == NULL) {
2432 strlcat(name, ".", sizeof name);
2433 strlcat(name, LocalDomain, sizeof name);
2434 }
2435 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2436 NI_NUMERICHOST | NI_NUMERICSERV) != 0)
2437 return (0); /* for safety, should not occur */
2438 dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2439 ip, port, name);
2440 sport = atoi(port);
2441
2442 /* now, walk down the list */
2443 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2444 if (ap->port != 0 && ap->port != sport) {
2445 dprintf("rejected in rule %d due to port mismatch.\n", i);
2446 continue;
2447 }
2448
2449 if (ap->isnumeric) {
2450 if (ap->a_addr.ss_family != sa->sa_family) {
2451 dprintf("rejected in rule %d due to address family mismatch.\n", i);
2452 continue;
2453 }
2454 if (ap->a_addr.ss_family == AF_INET) {
2455 sin4 = (struct sockaddr_in *)sa;
2456 a4p = (struct sockaddr_in *)&ap->a_addr;
2457 m4p = (struct sockaddr_in *)&ap->a_mask;
2458 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2459 != a4p->sin_addr.s_addr) {
2460 dprintf("rejected in rule %d due to IP mismatch.\n", i);
2461 continue;
2462 }
2463 }
2464 #ifdef INET6
2465 else if (ap->a_addr.ss_family == AF_INET6) {
2466 sin6 = (struct sockaddr_in6 *)sa;
2467 a6p = (struct sockaddr_in6 *)&ap->a_addr;
2468 m6p = (struct sockaddr_in6 *)&ap->a_mask;
2469 if (a6p->sin6_scope_id != 0 &&
2470 sin6->sin6_scope_id != a6p->sin6_scope_id) {
2471 dprintf("rejected in rule %d due to scope mismatch.\n", i);
2472 continue;
2473 }
2474 reject = 0;
2475 for (j = 0; j < 16; j += 4) {
2476 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2477 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2478 ++reject;
2479 break;
2480 }
2481 }
2482 if (reject) {
2483 dprintf("rejected in rule %d due to IP mismatch.\n", i);
2484 continue;
2485 }
2486 }
2487 #endif
2488 else
2489 continue;
2490 } else {
2491 cp = ap->a_name;
2492 l1 = strlen(name);
2493 if (*cp == '*') {
2494 /* allow wildmatch */
2495 cp++;
2496 l2 = strlen(cp);
2497 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2498 dprintf("rejected in rule %d due to name mismatch.\n", i);
2499 continue;
2500 }
2501 } else {
2502 /* exact match */
2503 l2 = strlen(cp);
2504 if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2505 dprintf("rejected in rule %d due to name mismatch.\n", i);
2506 continue;
2507 }
2508 }
2509 }
2510 dprintf("accepted in rule %d.\n", i);
2511 return (1); /* hooray! */
2512 }
2513 return (0);
2514 }
2515
2516 /*
2517 * Fairly similar to popen(3), but returns an open descriptor, as
2518 * opposed to a FILE *.
2519 */
2520 static int
2521 p_open(const char *prog, pid_t *rpid)
2522 {
2523 int pfd[2], nulldesc, i;
2524 pid_t pid;
2525 sigset_t omask, mask;
2526 char *argv[4]; /* sh -c cmd NULL */
2527 char errmsg[200];
2528
2529 if (pipe(pfd) == -1)
2530 return (-1);
2531 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2532 /* we are royally screwed anyway */
2533 return (-1);
2534
2535 sigemptyset(&mask);
2536 sigaddset(&mask, SIGALRM);
2537 sigaddset(&mask, SIGHUP);
2538 sigprocmask(SIG_BLOCK, &mask, &omask);
2539 switch ((pid = fork())) {
2540 case -1:
2541 sigprocmask(SIG_SETMASK, &omask, 0);
2542 close(nulldesc);
2543 return (-1);
2544
2545 case 0:
2546 argv[0] = strdup("sh");
2547 argv[1] = strdup("-c");
2548 argv[2] = strdup(prog);
2549 argv[3] = NULL;
2550 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2551 logerror("strdup");
2552 exit(1);
2553 }
2554
2555 alarm(0);
2556 setsid(); /* Avoid catching SIGHUPs. */
2557
2558 /*
2559 * Throw away pending signals, and reset signal
2560 * behaviour to standard values.
2561 */
2562 signal(SIGALRM, SIG_IGN);
2563 signal(SIGHUP, SIG_IGN);
2564 sigprocmask(SIG_SETMASK, &omask, 0);
2565 signal(SIGPIPE, SIG_DFL);
2566 signal(SIGQUIT, SIG_DFL);
2567 signal(SIGALRM, SIG_DFL);
2568 signal(SIGHUP, SIG_DFL);
2569
2570 dup2(pfd[0], STDIN_FILENO);
2571 dup2(nulldesc, STDOUT_FILENO);
2572 dup2(nulldesc, STDERR_FILENO);
2573 for (i = getdtablesize(); i > 2; i--)
2574 close(i);
2575
2576 execvp(_PATH_BSHELL, argv);
2577 _exit(255);
2578 }
2579
2580 sigprocmask(SIG_SETMASK, &omask, 0);
2581 close(nulldesc);
2582 close(pfd[0]);
2583 /*
2584 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are
2585 * supposed to get an EWOULDBLOCK on writev(2), which is
2586 * caught by the logic above anyway, which will in turn close
2587 * the pipe, and fork a new logging subprocess if necessary.
2588 * The stale subprocess will be killed some time later unless
2589 * it terminated itself due to closing its input pipe (so we
2590 * get rid of really dead puppies).
2591 */
2592 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2593 /* This is bad. */
2594 snprintf(errmsg, sizeof errmsg,
2595 "Warning: cannot change pipe to PID %d to "
2596 "non-blocking behaviour.",
2597 (int)pid);
2598 logerror(errmsg);
2599 }
2600 *rpid = pid;
2601 return (pfd[1]);
2602 }
2603
2604 static void
2605 deadq_enter(pid_t pid, const char *name)
2606 {
2607 dq_t p;
2608 int status;
2609
2610 /*
2611 * Be paranoid, if we can't signal the process, don't enter it
2612 * into the dead queue (perhaps it's already dead). If possible,
2613 * we try to fetch and log the child's status.
2614 */
2615 if (kill(pid, 0) != 0) {
2616 if (waitpid(pid, &status, WNOHANG) > 0)
2617 log_deadchild(pid, status, name);
2618 return;
2619 }
2620
2621 p = malloc(sizeof(struct deadq_entry));
2622 if (p == NULL) {
2623 logerror("malloc");
2624 exit(1);
2625 }
2626
2627 p->dq_pid = pid;
2628 p->dq_timeout = DQ_TIMO_INIT;
2629 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2630 }
2631
2632 static int
2633 deadq_remove(pid_t pid)
2634 {
2635 dq_t q;
2636
2637 TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2638 if (q->dq_pid == pid) {
2639 TAILQ_REMOVE(&deadq_head, q, dq_entries);
2640 free(q);
2641 return (1);
2642 }
2643 }
2644
2645 return (0);
2646 }
2647
2648 static void
2649 log_deadchild(pid_t pid, int status, const char *name)
2650 {
2651 int code;
2652 char buf[256];
2653 const char *reason;
2654
2655 errno = 0; /* Keep strerror() stuff out of logerror messages. */
2656 if (WIFSIGNALED(status)) {
2657 reason = "due to signal";
2658 code = WTERMSIG(status);
2659 } else {
2660 reason = "with status";
2661 code = WEXITSTATUS(status);
2662 if (code == 0)
2663 return;
2664 }
2665 snprintf(buf, sizeof buf,
2666 "Logging subprocess %d (%s) exited %s %d.",
2667 pid, name, reason, code);
2668 logerror(buf);
2669 }
2670
2671 static int *
2672 socksetup(int af, const char *bindhostname)
2673 {
2674 struct addrinfo hints, *res, *r;
2675 int error, maxs, *s, *socks;
2676
2677 memset(&hints, 0, sizeof(hints));
2678 hints.ai_flags = AI_PASSIVE;
2679 hints.ai_family = af;
2680 hints.ai_socktype = SOCK_DGRAM;
2681 error = getaddrinfo(bindhostname, "syslog", &hints, &res);
2682 if (error) {
2683 logerror(gai_strerror(error));
2684 errno = 0;
2685 die(0);
2686 }
2687
2688 /* Count max number of sockets we may open */
2689 for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2690 socks = malloc((maxs+1) * sizeof(int));
2691 if (socks == NULL) {
2692 logerror("couldn't allocate memory for sockets");
2693 die(0);
2694 }
2695
2696 *socks = 0; /* num of sockets counter at start of array */
2697 s = socks + 1;
2698 for (r = res; r; r = r->ai_next) {
2699 int on = 1;
2700 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2701 if (*s < 0) {
2702 logerror("socket");
2703 continue;
2704 }
2705 if (r->ai_family == AF_INET6) {
2706 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2707 (char *)&on, sizeof (on)) < 0) {
2708 logerror("setsockopt");
2709 close(*s);
2710 continue;
2711 }
2712 }
2713 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
2714 (char *)&on, sizeof (on)) < 0) {
2715 logerror("setsockopt");
2716 close(*s);
2717 continue;
2718 }
2719 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2720 close(*s);
2721 logerror("bind");
2722 continue;
2723 }
2724
2725 double_rbuf(*s);
2726
2727 (*socks)++;
2728 s++;
2729 }
2730
2731 if (*socks == 0) {
2732 free(socks);
2733 if (Debug)
2734 return (NULL);
2735 else
2736 die(0);
2737 }
2738 if (res)
2739 freeaddrinfo(res);
2740
2741 return (socks);
2742 }
2743
2744 ssize_t
2745 rbwritev(struct filed *f, struct iovec *iov, int iovcnt)
2746 {
2747 int i;
2748 ssize_t out = 0;
2749 ssize_t error;
2750
2751 for (i = 0; i < iovcnt; i++) {
2752 error = rbwrite(f, iov[i].iov_base, iov[i].iov_len);
2753 if (error == -1)
2754 return (-1);
2755 out += error;
2756 }
2757 return (out);
2758 }
2759
2760
2761 ssize_t
2762 rbwrite(struct filed *f, char *buf, size_t nbytes)
2763 {
2764 size_t maxwrite;
2765 ssize_t error;
2766 ssize_t out;
2767
2768 maxwrite = f->f_un.f_ring.f_footer->cf_max -
2769 f->f_un.f_ring.f_footer->cf_next;
2770 out = 0;
2771
2772 f->f_un.f_ring.f_footer->cf_lock = 1;
2773 while (nbytes > 0) {
2774 maxwrite = f->f_un.f_ring.f_footer->cf_max -
2775 f->f_un.f_ring.f_footer->cf_next;
2776 if (maxwrite > nbytes)
2777 maxwrite = nbytes;
2778 error = pwrite(f->f_file, buf, maxwrite,
2779 f->f_un.f_ring.f_footer->cf_next);
2780 if (error == -1) {
2781 f->f_un.f_ring.f_footer->cf_lock = 0;
2782 return (-1);
2783 }
2784 nbytes -= error;
2785 out += error;
2786 buf += error;
2787 f->f_un.f_ring.f_footer->cf_next += error;
2788 if (f->f_un.f_ring.f_footer->cf_next ==
2789 f->f_un.f_ring.f_footer->cf_max) {
2790 f->f_un.f_ring.f_footer->cf_next = 0;
2791 f->f_un.f_ring.f_footer->cf_wrap = 1;
2792 }
2793 }
2794
2795 f->f_un.f_ring.f_footer->cf_lock = 0;
2796 return (out);
2797 }
2798
2799 static void
2800 double_rbuf(int fd)
2801 {
2802 socklen_t slen, len;
2803
2804 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
2805 len *= 2;
2806 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen);
2807 }
2808 }
DragonFly BSD