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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 $
35 * syslogd -- log system messages
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.
42 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will
43 * cause it to reread its configuration file.
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
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
56 * -u and -v by Harlan Stenn.
57 * Priority comparison code by Harlan Stenn.
58 * Ring buffer code by Jeff Wheelhouse.
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 */
68 #include <sys/param.h>
69 #include <sys/ioctl.h>
72 #include <sys/socket.h>
73 #include <sys/queue.h>
77 #include <sys/resource.h>
78 #include <sys/syslimits.h>
80 #include <sys/types.h>
82 #include <netinet/in.h>
84 #include <arpa/inet.h>
101 #include "pathnames.h"
103 #include "../clog/clog.h"
104 #include "../nscd/pidfile.h"
107 #include <sys/syslog.h>
109 const char *ConfFile = _PATH_LOGCONF;
110 const char *PidFile = _PATH_LOGPID;
111 const char ctty[] = _PATH_CONSOLE;
112 const char ring_magic[] = "CLOG";
114 #define dprintf if (Debug) printf
116 #define MAXUNAMES 20 /* maximum number of user names */
120 * We have two default sockets, one with 666 permissions,
121 * and one for privileged programs.
127 STAILQ_ENTRY(funix) next;
129 struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
131 struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE,
134 STAILQ_HEAD(, funix) funixes = { &funix_default,
135 &(funix_secure.next.stqe_next) };
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 */
148 * This structure represents the files that will have log
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.
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 */
165 char *f_program; /* program this applies to */
167 char f_uname[MAXUNAMES][UT_NAMESIZE+1];
169 char f_hname[MAXHOSTNAMELEN];
170 struct addrinfo *f_addr;
172 } f_forw; /* forwarding address */
173 char f_fname[MAXPATHLEN];
175 char f_pname[MAXPATHLEN];
179 char f_rname[MAXPATHLEN];
180 struct clog_footer *f_footer;
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
197 * Queue of about-to-be dead processes we should watch out for.
200 TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
201 struct stailhead *deadq_headp;
206 TAILQ_ENTRY(deadq_entry) dq_entries;
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.
215 #define DQ_TIMO_INIT 2
217 typedef struct deadq_entry *dq_t;
221 * Struct to hold records of network addresses that are allowed to log
229 struct sockaddr_storage addr;
230 struct sockaddr_storage mask;
234 #define a_addr u.numeric.addr
235 #define a_mask u.numeric.mask
236 #define a_name u.name
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.
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; \
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) */
263 const char *TypeNames[] = {
264 "UNUSED", "FILE", "TTY", "CONSOLE",
265 "FORW", "USERS", "WALL", "PIPE",
269 static struct filed *Files; /* Log files that we write to */
270 static struct filed consfile; /* Console */
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 */
283 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
285 static int family = PF_INET; /* protocol family (IPv4 only) */
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 */
293 static char bootfile[MAXLINE+1]; /* booted kernel file */
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 */
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;
306 volatile sig_atomic_t MarkSet, WantDie;
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);
343 main(int argc, char *argv[])
345 int ch, i, fdsrmax = 0, l;
346 struct sockaddr_un sunx, fromunix;
347 struct sockaddr_storage frominet;
349 char line[MAXLINE + 1];
350 const char *bindhostname, *hname;
351 struct timeval tv, *tvp;
352 struct sigaction sact;
353 struct funix *fx, *fx1;
355 pid_t ppid = 1, spid;
359 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nop:P:sS:Tuv"))
376 case 'a': /* allow specific network addresses only */
377 if (allowaddr(optarg) == -1)
381 bindhostname = optarg;
389 case 'd': /* debug */
392 case 'f': /* configuration file */
395 case 'k': /* keep remote kern fac */
404 if (optarg[0] == '/') {
407 } else if ((name = strchr(optarg, ':')) != NULL) {
410 errx(1, "socket name must be absolute "
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",
418 mode = (mode_t )perml;
420 errx(1, "invalid mode %s, exiting",
422 } else /* doesn't begin with '/', and no ':' */
423 errx(1, "can't parse path %s", optarg);
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");
432 STAILQ_INSERT_TAIL(&funixes, fx, next);
435 case 'm': /* mark interval */
436 MarkInterval = atoi(optarg) * 60;
445 if (strlen(optarg) >= sizeof(sunx.sun_path))
446 errx(1, "%s path too long, exiting", optarg);
447 funix_default.name = optarg;
449 case 'P': /* path for alt. PID */
452 case 's': /* no network mode */
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;
463 case 'u': /* only log specified priority */
466 case 'v': /* log facility and priority */
472 if ((argc -= optind) != 0)
475 pfh = pidfile_open(PidFile, 0600, &spid);
478 errx(1, "syslogd already running, pid: %d", spid);
479 warn("cannot open pid file");
483 ppid = waitdaemon(0, 0, 30);
485 warn("could not become daemon");
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);
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,
510 sigaddset(&mask, SIGHUP);
511 sact.sa_handler = reapchild;
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. */
519 TAILQ_INIT(&deadq_head);
522 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
524 STAILQ_FOREACH_MUTABLE(fx, &funixes, next, fx1) {
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);
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);
536 dprintf("cannot create %s (%d)\n", fx->name, errno);
537 if (fx == &funix_default || fx == &funix_secure)
540 STAILQ_REMOVE(&funixes, fx, funix, next);
547 finet = socksetup(family, bindhostname);
551 for (i = 0; i < *finet; i++) {
552 if (shutdown(finet[i+1], SHUT_RD) < 0) {
553 logerror("shutdown");
559 dprintf("listening on inet and/or inet6 socket\n");
561 dprintf("sending on inet and/or inet6 socket\n");
564 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
565 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
568 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
570 /* tuck my process id away */
573 dprintf("off & running....\n");
576 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */
578 sigaddset(&mask, SIGCHLD);
579 sact.sa_handler = init;
581 sact.sa_flags = SA_RESTART;
582 sigaction(SIGHUP, &sact, NULL);
585 tv.tv_sec = tv.tv_usec = 0;
587 if (fklog != -1 && fklog > fdsrmax)
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];
595 STAILQ_FOREACH(fx, &funixes, next)
599 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
602 errx(1, "calloc fd_set");
610 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
615 if (finet && !SecureMode) {
616 for (i = 0; i < *finet; i++) {
617 if (finet[i+1] != -1)
618 FD_SET(finet[i+1], fdsr);
621 STAILQ_FOREACH(fx, &funixes, next)
624 i = select(fdsrmax+1, fdsr, NULL, NULL,
625 needdofsync ? &tv : tvp);
641 if (fklog != -1 && FD_ISSET(fklog, fdsr))
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,
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");
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);
668 printline(LocalHostName, line, 0);
669 } else if (l < 0 && errno != EINTR)
670 logerror("recvfrom unix");
679 unmapped(struct sockaddr *sa)
681 struct sockaddr_in6 *sin6;
682 struct sockaddr_in sin4;
684 if (sa->sa_family != AF_INET6)
686 if (sa->sa_len != sizeof(struct sockaddr_in6) ||
687 sizeof(sin4) > sa->sa_len)
689 sin6 = (struct sockaddr_in6 *)sa;
690 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
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;
700 memcpy(sa, &sin4, sin4.sin_len);
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]");
716 * Take a raw input line, decode the message, and print the message
717 * on the appropriate log files.
720 printline(const char *hname, char *msg, int flags)
725 char line[MAXLINE + 1];
727 /* test for special codes */
732 n = strtol(p + 1, &q, 10);
733 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
738 if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
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.
746 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
747 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
751 while ((c = (unsigned char)*p++) != '\0' &&
752 q < &line[sizeof(line) - 4]) {
753 if (mask_C1 && (c & 0x80) && c < 0xA0) {
758 if (isascii(c) && iscntrl(c)) {
761 } else if (c == '\t') {
773 logmsg(pri, line, hname, flags);
777 * Read /dev/klog while data are available, split into lines.
782 char *p, *q, line[MAXLINE + 1];
787 i = read(fklog, line + len, MAXLINE - 1 - len);
789 line[i + len] = '\0';
791 if (i < 0 && errno != EINTR && errno != EAGAIN) {
798 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
803 if (len >= MAXLINE - 1) {
808 memmove(line, p, len + 1);
815 * Take a raw input line from /dev/klog, format similar to syslog().
822 int flags, isprintf, pri;
824 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */
830 n = strtol(p + 1, &q, 10);
831 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
838 * Kernel printf's and LOG_CONSOLE messages have been displayed
839 * on the console already.
841 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
843 if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
845 logmsg(pri, p, LocalHostName, flags);
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.
856 skip_message(const char *name, const char *spec, int checkcase)
861 /* Behaviour on explicit match */
876 s = strstr (spec, name);
878 s = strcasestr (spec, name);
881 prev = (s == spec ? ',' : *(s - 1));
882 next = *(s + strlen (name));
884 if (prev == ',' && (next == '\0' || next == ','))
885 /* Explicit match: skip iff the spec is an
890 /* No explicit match for this name: skip the message iff
891 the spec is an inclusive one. */
896 * Log a message to the appropriate log files, users, etc. based on
900 logmsg(int pri, const char *msg, const char *from, int flags)
903 int i, fac, msglen, omask, prilev;
904 const char *timestamp;
905 char prog[NAME_MAX+1];
908 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
909 pri, flags, from, msg);
911 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
914 * Check to see if msg looks non-standard.
916 msglen = strlen(msg);
917 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
918 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
922 if (flags & ADDDATE) {
923 timestamp = ctime(&now) + 4;
930 /* skip leading blanks */
931 while (isspace(*msg)) {
936 /* extract facility and priority level */
938 fac = LOG_NFACILITIES;
942 /* Check maximum facility number. */
943 if (fac > LOG_NFACILITIES) {
948 prilev = LOG_PRI(pri);
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]))
959 /* add kernel prefix for kernel messages */
960 if (flags & ISKERNEL) {
961 snprintf(buf, sizeof(buf), "%s: %s",
962 use_bootfile ? bootfile : "kernel", msg);
964 msglen = strlen(buf);
967 /* log the message to the particular outputs */
971 * Open in non-blocking mode to avoid hangs during open
972 * and close(waiting for the port to drain).
974 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
976 if (f->f_file >= 0) {
977 strlcpy(f->f_lasttime, timestamp,
978 sizeof(f->f_lasttime));
979 fprintlog(f, flags, msg);
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))
991 || f->f_pmask[fac] == INTERNAL_NOPRI)
994 /* skip messages with the incorrect hostname */
995 if (skip_message(from, f->f_host, 0))
998 /* skip messages with the incorrect program name */
999 if (skip_message(prog, f->f_program, 1))
1002 /* skip message to console if it has already been printed */
1003 if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1006 /* don't output marks to recently written files */
1007 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1011 * suppress duplicate lines to this file
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));
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]);
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
1029 if (now > REPEATTIME(f)) {
1030 fprintlog(f, flags, NULL);
1034 /* new line, save it */
1036 fprintlog(f, 0, NULL);
1037 f->f_repeatcount = 0;
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);
1047 f->f_prevline[0] = 0;
1049 fprintlog(f, flags, msg);
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;
1072 fprintlog(struct filed *f, int flags, const char *msg)
1074 struct iovec iov[IOV_SIZE];
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";
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.
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);
1099 v->iov_base = f->f_lasttime;
1100 v->iov_len = strlen(f->f_lasttime);
1102 v->iov_base = space;
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 */
1116 if (LogFacPri > 1) {
1119 for (c = facilitynames; c->c_name; c++) {
1120 if (c->c_val == fac) {
1125 for (c = prioritynames; c->c_name; c++) {
1126 if (c->c_val == pri) {
1133 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1137 snprintf(p_n, sizeof p_n, "%d", pri);
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);
1149 v->iov_base = f->f_prevhost;
1150 v->iov_len = strlen(v->iov_base);
1152 v->iov_base = space;
1157 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
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;
1176 dprintf("Logging to %s", TypeNames[f->f_type]);
1179 switch (f->f_type) {
1186 port = (int)ntohs(((struct sockaddr_in *)
1187 (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1189 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port);
1191 dprintf(" %s\n", f->f_un.f_forw.f_hname);
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);
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);
1205 else if (l > MAXLINE)
1209 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1210 for (i = 0; i < *finet; i++) {
1213 * should we check AF first, or just
1214 * trial and error? FWD
1217 address_family_of(finet[i+1]))
1219 lsent = sendto(finet[i+1], line, l, 0,
1220 r->ai_addr, r->ai_addrlen);
1224 if (lsent == l && !send_to_all)
1227 dprintf("lsent/l: %d/%d\n", lsent, l);
1240 /* case ENOTSOCK: */
1242 /* case EMSGSIZE: */
1245 /* case ECONNREFUSED: */
1247 dprintf("removing entry\n");
1248 f->f_type = F_UNUSED;
1256 dprintf(" %s\n", f->f_un.f_fname);
1259 if (writev(f->f_file, iov, IOV_SIZE) < 0) {
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.
1265 if (errno != ENOSPC) {
1268 f->f_type = F_UNUSED;
1270 logerror(f->f_un.f_fname);
1272 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1273 f->f_flags |= FFLAG_NEEDSYNC;
1279 dprintf(" %s\n", f->f_un.f_ring.f_rname);
1282 if (rbwritev(f, iov, 7) == -1) {
1284 munmap(f->f_un.f_ring.f_footer,
1285 sizeof(struct clog_footer));
1287 f->f_type = F_UNUSED;
1289 logerror(f->f_un.f_fname);
1294 dprintf(" %s\n", f->f_un.f_pipe.f_pname);
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);
1305 if (writev(f->f_file, iov, IOV_SIZE) < 0) {
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;
1313 logerror(f->f_un.f_pipe.f_pname);
1318 if (flags & IGN_CONS) {
1319 dprintf(" (ignored)\n");
1325 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
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;
1341 wallmsg(f, iov, IOV_SIZE);
1349 * WALLMSG -- Write a message to the world at large
1351 * Write the specified message to either the entire
1352 * world, or a list of approved users.
1355 wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1357 static int reenter; /* avoid calling ourselves */
1362 char line[sizeof(ut.ut_line) + 1];
1366 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1367 logerror(_PATH_UTMP);
1372 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1373 if (ut.ut_name[0] == '\0')
1375 /* We must use strncpy since ut_* may not be NUL terminated. */
1376 strncpy(line, ut.ut_line, sizeof(line) - 1);
1377 line[sizeof(line) - 1] = '\0';
1378 if (f->f_type == F_WALL) {
1379 if ((p = ttymsg(iov, iovlen, line, TTYMSGTIME)) !=
1381 errno = 0; /* already in msg */
1386 /* should we send the message to this user? */
1387 for (i = 0; i < MAXUNAMES; i++) {
1388 if (!f->f_un.f_uname[i][0])
1390 if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1392 if ((p = ttymsg(iov, iovlen, line, TTYMSGTIME))
1394 errno = 0; /* already in msg */
1406 reapchild(int signo __unused)
1412 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) {
1414 /* Don't tell while we are initting. */
1417 /* First, look if it's a process from the dead queue. */
1418 if (deadq_remove(pid))
1421 /* Now, look in list of active processes. */
1422 for (f = Files; f; f = f->f_next)
1423 if (f->f_type == F_PIPE &&
1424 f->f_un.f_pipe.f_pid == pid) {
1426 f->f_un.f_pipe.f_pid = 0;
1427 log_deadchild(pid, status,
1428 f->f_un.f_pipe.f_pname);
1437 * Return a printable representation of a host address.
1440 cvthname(struct sockaddr *f)
1443 sigset_t omask, nmask;
1444 static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1446 error = getnameinfo((struct sockaddr *)f,
1447 ((struct sockaddr *)f)->sa_len,
1448 ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
1449 dprintf("cvthname(%s)\n", ip);
1452 dprintf("Malformed from address %s\n", gai_strerror(error));
1458 sigemptyset(&nmask);
1459 sigaddset(&nmask, SIGHUP);
1460 sigprocmask(SIG_BLOCK, &nmask, &omask);
1461 error = getnameinfo((struct sockaddr *)f,
1462 ((struct sockaddr *)f)->sa_len,
1463 hname, sizeof hname, NULL, 0, NI_NAMEREQD);
1464 sigprocmask(SIG_SETMASK, &omask, NULL);
1466 dprintf("Host name for your address (%s) unknown\n", ip);
1470 if (hl > 0 && hname[hl-1] == '.')
1472 trimdomain(hname, hl);
1484 domark(int signo __unused)
1491 * Print syslogd errors some place.
1494 logerror(const char *type)
1497 static int recursed = 0;
1499 /* If there's an error while trying to log an error, give up. */
1505 sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1507 snprintf(buf, sizeof buf, "syslogd: %s", type);
1509 dprintf("%s\n", buf);
1510 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1519 int was_initialized;
1522 was_initialized = Initialized;
1523 Initialized = 0; /* Don't log SIGCHLDs. */
1524 for (f = Files; f != NULL; f = f->f_next) {
1525 /* flush any pending output */
1527 fprintlog(f, 0, NULL);
1528 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) {
1530 f->f_un.f_pipe.f_pid = 0;
1533 Initialized = was_initialized;
1535 dprintf("syslogd: exiting on signal %d\n", signo);
1536 snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1540 STAILQ_FOREACH(fx, &funixes, next)
1542 pidfile_remove(pfh);
1548 * INIT -- Initialize syslogd from configuration table
1555 struct filed *f, *next, **nextp;
1557 char cline[LINE_MAX];
1558 char prog[NAME_MAX+1];
1559 char host[MAXHOSTNAMELEN];
1560 char oldLocalHostName[MAXHOSTNAMELEN];
1561 char hostMsg[2*MAXHOSTNAMELEN+40];
1562 char bootfileMsg[LINE_MAX];
1567 * Load hostname (may have changed).
1570 strlcpy(oldLocalHostName, LocalHostName,
1571 sizeof(oldLocalHostName));
1572 if (gethostname(LocalHostName, sizeof(LocalHostName)))
1573 err(EX_OSERR, "gethostname() failed");
1574 if ((p = strchr(LocalHostName, '.')) != NULL) {
1582 * Close all open log files.
1585 for (f = Files; f != NULL; f = next) {
1586 /* flush any pending output */
1588 fprintlog(f, 0, NULL);
1590 switch (f->f_type) {
1598 if (f->f_un.f_pipe.f_pid > 0) {
1600 deadq_enter(f->f_un.f_pipe.f_pid,
1601 f->f_un.f_pipe.f_pname);
1603 f->f_un.f_pipe.f_pid = 0;
1606 munmap(f->f_un.f_ring.f_footer,
1607 sizeof(struct clog_footer));
1612 if (f->f_program) free(f->f_program);
1613 if (f->f_host) free(f->f_host);
1619 /* open the configuration file */
1620 if ((cf = fopen(ConfFile, "r")) == NULL) {
1621 dprintf("cannot open %s\n", ConfFile);
1622 *nextp = (struct filed *)calloc(1, sizeof(*f));
1623 if (*nextp == NULL) {
1627 cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1628 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1629 if ((*nextp)->f_next == NULL) {
1633 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1639 * Foreach line in the conf table, open that file.
1642 strlcpy(host, "*", sizeof(host));
1643 strlcpy(prog, "*", sizeof(prog));
1644 while (fgets(cline, sizeof(cline), cf) != NULL) {
1646 * check for end-of-section, comments, strip off trailing
1647 * spaces and newline character. #!prog is treated specially:
1648 * following lines apply only to that program.
1650 for (p = cline; isspace(*p); ++p)
1656 if (*p != '!' && *p != '+' && *p != '-')
1659 if (*p == '+' || *p == '-') {
1663 if ((!*p) || (*p == '*')) {
1664 strlcpy(host, "*", sizeof(host));
1669 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1670 if (!isalnum(*p) && *p != '.' && *p != '-'
1671 && *p != ',' && *p != ':' && *p != '%')
1680 while (isspace(*p)) p++;
1681 if ((!*p) || (*p == '*')) {
1682 strlcpy(prog, "*", sizeof(prog));
1685 for (i = 0; i < NAME_MAX; i++) {
1686 if (!isprint(p[i]) || isspace(p[i]))
1693 for (p = cline + 1; *p != '\0'; p++) {
1696 if (*(p - 1) == '\\') {
1704 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1706 f = (struct filed *)calloc(1, sizeof(*f));
1713 cfline(cline, f, prog, host);
1716 /* close the configuration file */
1723 for (f = Files; f; f = f->f_next) {
1724 for (i = 0; i <= LOG_NFACILITIES; i++)
1725 if (f->f_pmask[i] == INTERNAL_NOPRI)
1728 printf("%d ", f->f_pmask[i]);
1729 printf("%s: ", TypeNames[f->f_type]);
1730 switch (f->f_type) {
1732 printf("%s", f->f_un.f_fname);
1737 printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1741 port = (int)ntohs(((struct sockaddr_in *)
1742 (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1745 f->f_un.f_forw.f_hname, port);
1747 printf("%s", f->f_un.f_forw.f_hname);
1752 printf("%s", f->f_un.f_ring.f_rname);
1756 printf("%s", f->f_un.f_pipe.f_pname);
1760 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1761 printf("%s, ", f->f_un.f_uname[i]);
1765 printf(" (%s)", f->f_program);
1770 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1771 dprintf("syslogd: restarted\n");
1773 * Log a change in hostname, but only on a restart.
1775 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1776 snprintf(hostMsg, sizeof(hostMsg),
1777 "syslogd: hostname changed, \"%s\" to \"%s\"",
1778 oldLocalHostName, LocalHostName);
1779 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1780 dprintf("%s\n", hostMsg);
1783 * Log the kernel boot file if we aren't going to use it as
1784 * the prefix, and if this is *not* a restart.
1786 if (signo == 0 && !use_bootfile) {
1787 snprintf(bootfileMsg, sizeof(bootfileMsg),
1788 "syslogd: kernel boot file is %s", bootfile);
1789 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1790 dprintf("%s\n", bootfileMsg);
1795 * Crack a configuration file line
1798 cfline(const char *line, struct filed *f, const char *prog, const char *host)
1800 struct addrinfo hints, *res;
1801 int error, i, pri, syncfile;
1804 char buf[MAXLINE], ebuf[100];
1807 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1809 errno = 0; /* keep strerror() stuff out of logerror messages */
1811 /* clear out file entry */
1812 memset(f, 0, sizeof(*f));
1813 for (i = 0; i <= LOG_NFACILITIES; i++)
1814 f->f_pmask[i] = INTERNAL_NOPRI;
1816 /* save hostname if any */
1817 if (host && *host == '*')
1822 f->f_host = strdup(host);
1823 if (f->f_host == NULL) {
1827 hl = strlen(f->f_host);
1828 if (hl > 0 && f->f_host[hl-1] == '.')
1829 f->f_host[--hl] = '\0';
1830 trimdomain(f->f_host, hl);
1833 /* save program name if any */
1834 if (prog && *prog == '*')
1837 f->f_program = strdup(prog);
1838 if (f->f_program == NULL) {
1844 /* scan through the list of selectors */
1845 for (p = line; *p && *p != '\t' && *p != ' ';) {
1850 /* find the end of this facility name list */
1851 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1854 /* get the priority comparison */
1882 /* collect priority name */
1883 for (bp = buf; *q && !strchr("\t,; ", *q); )
1888 while (strchr(",;", *q))
1891 /* decode priority name */
1894 pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1896 /* Ignore trailing spaces. */
1897 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
1900 pri = decode(buf, prioritynames);
1902 snprintf(ebuf, sizeof ebuf,
1903 "unknown priority name \"%s\"", buf);
1909 pri_cmp = (UniquePriority)
1914 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
1916 /* scan facilities */
1917 while (*p && !strchr("\t.; ", *p)) {
1918 for (bp = buf; *p && !strchr("\t,;. ", *p); )
1923 for (i = 0; i < LOG_NFACILITIES; i++) {
1924 f->f_pmask[i] = pri;
1925 f->f_pcmp[i] = pri_cmp;
1928 i = decode(buf, facilitynames);
1930 snprintf(ebuf, sizeof ebuf,
1931 "unknown facility name \"%s\"",
1936 f->f_pmask[i >> 3] = pri;
1937 f->f_pcmp[i >> 3] = pri_cmp;
1939 while (*p == ',' || *p == ' ')
1946 /* skip to action part */
1947 while (*p == '\t' || *p == ' ')
1961 * scan forward to see if there is a port defined.
1962 * so we can't use strlcpy..
1964 i = sizeof(f->f_un.f_forw.f_hname);
1965 tp = f->f_un.f_forw.f_hname;
1968 while (*p && (*p != ':') && (i-- > 0)) {
1973 /* See if we copied a domain and have a port */
1979 memset(&hints, 0, sizeof(hints));
1980 hints.ai_family = family;
1981 hints.ai_socktype = SOCK_DGRAM;
1982 error = getaddrinfo(f->f_un.f_forw.f_hname,
1983 p ? p : "syslog", &hints, &res);
1985 logerror(gai_strerror(error));
1988 f->f_un.f_forw.f_addr = res;
1993 if ((f->f_file = open(p, logflags, 0600)) < 0) {
1994 f->f_type = F_UNUSED;
1999 f->f_flags |= FFLAG_SYNC;
2000 if (isatty(f->f_file)) {
2001 if (strcmp(p, ctty) == 0)
2002 f->f_type = F_CONSOLE;
2005 strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
2006 sizeof(f->f_un.f_fname));
2008 strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
2014 if ((f->f_file = open(p + 1, O_RDWR, 0 )) < 0) {
2015 f->f_type = F_UNUSED;
2019 if (fstat(f->f_file,&sb) < 0) {
2021 f->f_type = F_UNUSED;
2025 f->f_un.f_ring.f_footer =
2026 mmap(NULL, sizeof(struct clog_footer),
2027 PROT_READ|PROT_WRITE, MAP_SHARED,
2028 f->f_file, sb.st_size-sizeof(struct clog_footer));
2029 if (f->f_un.f_ring.f_footer == NULL) {
2031 f->f_type = F_UNUSED;
2035 if (memcmp(&(f->f_un.f_ring.f_footer->cf_magic), MAGIC_CONST, 4) != 0) {
2036 munmap(f->f_un.f_ring.f_footer,
2037 sizeof(struct clog_footer));
2039 f->f_type = F_UNUSED;
2044 f->f_un.f_ring.f_size = sb.st_size;
2045 strcpy(f->f_un.f_ring.f_rname, p + 1);
2050 f->f_un.f_pipe.f_pid = 0;
2051 strlcpy(f->f_un.f_pipe.f_pname, p + 1,
2052 sizeof(f->f_un.f_pipe.f_pname));
2061 for (i = 0; i < MAXUNAMES && *p; i++) {
2062 for (q = p; *q && *q != ','; )
2064 strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
2065 if ((q - p) > UT_NAMESIZE)
2066 f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
2068 f->f_un.f_uname[i][q - p] = '\0';
2069 while (*q == ',' || *q == ' ')
2073 f->f_type = F_USERS;
2080 * Decode a symbolic name to a numeric value
2083 decode(const char *name, CODE *codetab)
2089 return (atoi(name));
2091 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2093 *p = tolower(*name);
2098 for (c = codetab; c->c_name; c++)
2099 if (!strcmp(buf, c->c_name))
2112 MarkSeq += TIMERINTVL;
2113 if (MarkSeq >= MarkInterval) {
2114 logmsg(LOG_INFO, "-- MARK --",
2115 LocalHostName, ADDDATE|MARK);
2119 for (f = Files; f; f = f->f_next) {
2120 if (f->f_prevcount && now >= REPEATTIME(f)) {
2121 dprintf("flush %s: repeated %d times, %d sec.\n",
2122 TypeNames[f->f_type], f->f_prevcount,
2123 repeatinterval[f->f_repeatcount]);
2124 fprintlog(f, 0, NULL);
2129 /* Walk the dead queue, and see if we should signal somebody. */
2130 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2131 next = TAILQ_NEXT(q, dq_entries);
2133 switch (q->dq_timeout) {
2135 /* Already signalled once, try harder now. */
2136 if (kill(q->dq_pid, SIGKILL) != 0)
2137 deadq_remove(q->dq_pid);
2142 * Timed out on dead queue, send terminate
2143 * signal. Note that we leave the removal
2144 * from the dead queue to reapchild(), which
2145 * will also log the event (unless the process
2146 * didn't even really exist, in case we simply
2147 * drop it from the dead queue).
2149 if (kill(q->dq_pid, SIGTERM) != 0)
2150 deadq_remove(q->dq_pid);
2162 * fork off and become a daemon, but wait for the child to come online
2163 * before returing to the parent, or we get disk thrashing at boot etc.
2164 * Set a timer so we don't hang forever if it wedges.
2167 waitdaemon(int nochdir, int noclose, int maxwait)
2171 pid_t pid, childpid;
2173 switch (childpid = fork()) {
2179 signal(SIGALRM, timedout);
2181 while ((pid = wait3(&status, 0, NULL)) != -1) {
2182 if (WIFEXITED(status))
2183 errx(1, "child pid %d exited with return code %d",
2184 pid, WEXITSTATUS(status));
2185 if (WIFSIGNALED(status))
2186 errx(1, "child pid %d exited on signal %d%s",
2187 pid, WTERMSIG(status),
2188 WCOREDUMP(status) ? " (core dumped)" :
2190 if (pid == childpid) /* it's gone... */
2202 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2203 dup2(fd, STDIN_FILENO);
2204 dup2(fd, STDOUT_FILENO);
2205 dup2(fd, STDERR_FILENO);
2213 * We get a SIGALRM from the child when it's running and finished doing it's
2214 * fsync()'s or O_SYNC writes for all the boot messages.
2216 * We also get a signal from the kernel if the timer expires, so check to
2217 * see what happened.
2220 timedout(int sig __unused)
2224 signal(SIGALRM, SIG_DFL);
2226 errx(1, "timed out waiting for child");
2232 * Add `s' to the list of allowable peer addresses to accept messages
2235 * `s' is a string in the form:
2237 * [*]domainname[:{servicename|portnumber|*}]
2241 * netaddr/maskbits[:{servicename|portnumber|*}]
2243 * Returns -1 on error, 0 if the argument was valid.
2249 struct allowedpeer ap;
2252 struct addrinfo hints, *res;
2253 struct in_addr *addrp, *maskp;
2256 u_int32_t *addr6p, *mask6p;
2258 char ip[NI_MAXHOST];
2261 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2264 if ((cp1 = strrchr(cp1, ':'))) {
2265 /* service/port provided */
2267 if (strlen(cp1) == 1 && *cp1 == '*')
2268 /* any port allowed */
2270 else if ((se = getservbyname(cp1, "udp"))) {
2271 ap.port = ntohs(se->s_port);
2273 ap.port = strtol(cp1, &cp2, 0);
2275 return (-1); /* port not numeric */
2278 if ((se = getservbyname("syslog", "udp")))
2279 ap.port = ntohs(se->s_port);
2281 /* sanity, should not happen */
2285 if ((cp1 = strchr(s, '/')) != NULL &&
2286 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2288 if ((masklen = atoi(cp1 + 1)) < 0)
2293 cp2 = s + strlen(s) - 1;
2304 memset(&hints, 0, sizeof(hints));
2305 hints.ai_family = PF_UNSPEC;
2306 hints.ai_socktype = SOCK_DGRAM;
2307 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2308 if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2310 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2311 memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2312 ap.a_mask.ss_family = res->ai_family;
2313 if (res->ai_family == AF_INET) {
2314 ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2315 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2316 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2318 /* use default netmask */
2319 if (IN_CLASSA(ntohl(addrp->s_addr)))
2320 maskp->s_addr = htonl(IN_CLASSA_NET);
2321 else if (IN_CLASSB(ntohl(addrp->s_addr)))
2322 maskp->s_addr = htonl(IN_CLASSB_NET);
2324 maskp->s_addr = htonl(IN_CLASSC_NET);
2325 } else if (masklen <= 32) {
2326 /* convert masklen to netmask */
2330 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2335 /* Lose any host bits in the network number. */
2336 addrp->s_addr &= maskp->s_addr;
2339 else if (res->ai_family == AF_INET6 && masklen <= 128) {
2340 ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2343 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2344 /* convert masklen to netmask */
2345 while (masklen > 0) {
2347 *mask6p = htonl(~(0xffffffff >> masklen));
2350 *mask6p++ = 0xffffffff;
2353 /* Lose any host bits in the network number. */
2354 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2355 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2356 for (i = 0; i < 4; i++)
2357 addr6p[i] &= mask6p[i];
2366 /* arg `s' is domain name */
2380 printf("allowaddr: rule %d: ", NumAllowed);
2382 printf("numeric, ");
2383 getnameinfo((struct sockaddr *)&ap.a_addr,
2384 ((struct sockaddr *)&ap.a_addr)->sa_len,
2385 ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2386 printf("addr = %s, ", ip);
2387 getnameinfo((struct sockaddr *)&ap.a_mask,
2388 ((struct sockaddr *)&ap.a_mask)->sa_len,
2389 ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2390 printf("mask = %s; ", ip);
2392 printf("domainname = %s; ", ap.a_name);
2394 printf("port = %d\n", ap.port);
2397 if ((AllowedPeers = realloc(AllowedPeers,
2398 ++NumAllowed * sizeof(struct allowedpeer)))
2400 logerror("realloc");
2403 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2408 * Validate that the remote peer has permission to log to us.
2411 validate(struct sockaddr *sa, const char *hname)
2415 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2416 struct allowedpeer *ap;
2417 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2420 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2422 struct addrinfo hints, *res;
2425 if (NumAllowed == 0)
2426 /* traditional behaviour, allow everything */
2429 strlcpy(name, hname, sizeof(name));
2430 memset(&hints, 0, sizeof(hints));
2431 hints.ai_family = PF_UNSPEC;
2432 hints.ai_socktype = SOCK_DGRAM;
2433 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2434 if (getaddrinfo(name, NULL, &hints, &res) == 0)
2436 else if (strchr(name, '.') == NULL) {
2437 strlcat(name, ".", sizeof name);
2438 strlcat(name, LocalDomain, sizeof name);
2440 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2441 NI_NUMERICHOST | NI_NUMERICSERV) != 0)
2442 return (0); /* for safety, should not occur */
2443 dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2447 /* now, walk down the list */
2448 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2449 if (ap->port != 0 && ap->port != sport) {
2450 dprintf("rejected in rule %d due to port mismatch.\n", i);
2454 if (ap->isnumeric) {
2455 if (ap->a_addr.ss_family != sa->sa_family) {
2456 dprintf("rejected in rule %d due to address family mismatch.\n", i);
2459 if (ap->a_addr.ss_family == AF_INET) {
2460 sin4 = (struct sockaddr_in *)sa;
2461 a4p = (struct sockaddr_in *)&ap->a_addr;
2462 m4p = (struct sockaddr_in *)&ap->a_mask;
2463 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2464 != a4p->sin_addr.s_addr) {
2465 dprintf("rejected in rule %d due to IP mismatch.\n", i);
2470 else if (ap->a_addr.ss_family == AF_INET6) {
2471 sin6 = (struct sockaddr_in6 *)sa;
2472 a6p = (struct sockaddr_in6 *)&ap->a_addr;
2473 m6p = (struct sockaddr_in6 *)&ap->a_mask;
2474 if (a6p->sin6_scope_id != 0 &&
2475 sin6->sin6_scope_id != a6p->sin6_scope_id) {
2476 dprintf("rejected in rule %d due to scope mismatch.\n", i);
2480 for (j = 0; j < 16; j += 4) {
2481 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2482 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2488 dprintf("rejected in rule %d due to IP mismatch.\n", i);
2499 /* allow wildmatch */
2502 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2503 dprintf("rejected in rule %d due to name mismatch.\n", i);
2509 if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2510 dprintf("rejected in rule %d due to name mismatch.\n", i);
2515 dprintf("accepted in rule %d.\n", i);
2516 return (1); /* hooray! */
2522 * Fairly similar to popen(3), but returns an open descriptor, as
2523 * opposed to a FILE *.
2526 p_open(const char *prog, pid_t *rpid)
2528 int pfd[2], nulldesc, i;
2530 sigset_t omask, mask;
2531 char *argv[4]; /* sh -c cmd NULL */
2534 if (pipe(pfd) == -1)
2536 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2537 /* we are royally screwed anyway */
2541 sigaddset(&mask, SIGALRM);
2542 sigaddset(&mask, SIGHUP);
2543 sigprocmask(SIG_BLOCK, &mask, &omask);
2544 switch ((pid = fork())) {
2546 sigprocmask(SIG_SETMASK, &omask, 0);
2551 argv[0] = strdup("sh");
2552 argv[1] = strdup("-c");
2553 argv[2] = strdup(prog);
2555 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2561 setsid(); /* Avoid catching SIGHUPs. */
2564 * Throw away pending signals, and reset signal
2565 * behaviour to standard values.
2567 signal(SIGALRM, SIG_IGN);
2568 signal(SIGHUP, SIG_IGN);
2569 sigprocmask(SIG_SETMASK, &omask, 0);
2570 signal(SIGPIPE, SIG_DFL);
2571 signal(SIGQUIT, SIG_DFL);
2572 signal(SIGALRM, SIG_DFL);
2573 signal(SIGHUP, SIG_DFL);
2575 dup2(pfd[0], STDIN_FILENO);
2576 dup2(nulldesc, STDOUT_FILENO);
2577 dup2(nulldesc, STDERR_FILENO);
2578 for (i = getdtablesize(); i > 2; i--)
2581 execvp(_PATH_BSHELL, argv);
2585 sigprocmask(SIG_SETMASK, &omask, 0);
2589 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are
2590 * supposed to get an EWOULDBLOCK on writev(2), which is
2591 * caught by the logic above anyway, which will in turn close
2592 * the pipe, and fork a new logging subprocess if necessary.
2593 * The stale subprocess will be killed some time later unless
2594 * it terminated itself due to closing its input pipe (so we
2595 * get rid of really dead puppies).
2597 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2599 snprintf(errmsg, sizeof errmsg,
2600 "Warning: cannot change pipe to PID %d to "
2601 "non-blocking behaviour.",
2610 deadq_enter(pid_t pid, const char *name)
2616 * Be paranoid, if we can't signal the process, don't enter it
2617 * into the dead queue (perhaps it's already dead). If possible,
2618 * we try to fetch and log the child's status.
2620 if (kill(pid, 0) != 0) {
2621 if (waitpid(pid, &status, WNOHANG) > 0)
2622 log_deadchild(pid, status, name);
2626 p = malloc(sizeof(struct deadq_entry));
2633 p->dq_timeout = DQ_TIMO_INIT;
2634 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2638 deadq_remove(pid_t pid)
2642 TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2643 if (q->dq_pid == pid) {
2644 TAILQ_REMOVE(&deadq_head, q, dq_entries);
2654 log_deadchild(pid_t pid, int status, const char *name)
2660 errno = 0; /* Keep strerror() stuff out of logerror messages. */
2661 if (WIFSIGNALED(status)) {
2662 reason = "due to signal";
2663 code = WTERMSIG(status);
2665 reason = "with status";
2666 code = WEXITSTATUS(status);
2670 snprintf(buf, sizeof buf,
2671 "Logging subprocess %d (%s) exited %s %d.",
2672 pid, name, reason, code);
2677 socksetup(int af, const char *bindhostname)
2679 struct addrinfo hints, *res, *r;
2680 int error, maxs, *s, *socks;
2682 memset(&hints, 0, sizeof(hints));
2683 hints.ai_flags = AI_PASSIVE;
2684 hints.ai_family = af;
2685 hints.ai_socktype = SOCK_DGRAM;
2686 error = getaddrinfo(bindhostname, "syslog", &hints, &res);
2688 logerror(gai_strerror(error));
2693 /* Count max number of sockets we may open */
2694 for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2695 socks = malloc((maxs+1) * sizeof(int));
2696 if (socks == NULL) {
2697 logerror("couldn't allocate memory for sockets");
2701 *socks = 0; /* num of sockets counter at start of array */
2703 for (r = res; r; r = r->ai_next) {
2705 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2710 if (r->ai_family == AF_INET6) {
2711 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2712 (char *)&on, sizeof (on)) < 0) {
2713 logerror("setsockopt");
2718 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
2719 (char *)&on, sizeof (on)) < 0) {
2720 logerror("setsockopt");
2724 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2750 rbwritev(struct filed *f, struct iovec *iov, int iovcnt)
2756 for (i = 0; i < iovcnt; i++) {
2757 error = rbwrite(f, iov[i].iov_base, iov[i].iov_len);
2767 rbwrite(struct filed *f, char *buf, size_t nbytes)
2773 maxwrite = f->f_un.f_ring.f_footer->cf_max -
2774 f->f_un.f_ring.f_footer->cf_next;
2777 f->f_un.f_ring.f_footer->cf_lock = 1;
2778 while (nbytes > 0) {
2779 maxwrite = f->f_un.f_ring.f_footer->cf_max -
2780 f->f_un.f_ring.f_footer->cf_next;
2781 if (maxwrite > nbytes)
2783 error = pwrite(f->f_file, buf, maxwrite,
2784 f->f_un.f_ring.f_footer->cf_next);
2786 f->f_un.f_ring.f_footer->cf_lock = 0;
2792 f->f_un.f_ring.f_footer->cf_next += error;
2793 if (f->f_un.f_ring.f_footer->cf_next ==
2794 f->f_un.f_ring.f_footer->cf_max) {
2795 f->f_un.f_ring.f_footer->cf_next = 0;
2796 f->f_un.f_ring.f_footer->cf_wrap = 1;
2800 f->f_un.f_ring.f_footer->cf_lock = 0;
2807 socklen_t slen, len;
2809 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
2811 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen);