syslogd.c revision 199804 
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
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1983, 1988, 1993, 1994\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)syslogd.c	8.3 (Berkeley) 4/4/94";
39#endif
40#endif /* not lint */
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: head/usr.sbin/syslogd/syslogd.c 199804 2009-11-25 15:12:24Z attilio $");
44
45/*
46 *  syslogd -- log system messages
47 *
48 * This program implements a system log. It takes a series of lines.
49 * Each line may have a priority, signified as "<n>" as
50 * the first characters of the line.  If this is
51 * not present, a default priority is used.
52 *
53 * To kill syslogd, send a signal 15 (terminate).  A signal 1 (hup) will
54 * cause it to reread its configuration file.
55 *
56 * Defined Constants:
57 *
58 * MAXLINE -- the maximum line length that can be handled.
59 * DEFUPRI -- the default priority for user messages
60 * DEFSPRI -- the default priority for kernel messages
61 *
62 * Author: Eric Allman
63 * extensive changes by Ralph Campbell
64 * more extensive changes by Eric Allman (again)
65 * Extension to log by program name as well as facility and priority
66 *   by Peter da Silva.
67 * -u and -v by Harlan Stenn.
68 * Priority comparison code by Harlan Stenn.
69 */
70
71#define	MAXLINE		1024		/* maximum line length */
72#define	MAXSVLINE	120		/* maximum saved line length */
73#define	DEFUPRI		(LOG_USER|LOG_NOTICE)
74#define	DEFSPRI		(LOG_KERN|LOG_CRIT)
75#define	TIMERINTVL	30		/* interval for checking flush, mark */
76#define	TTYMSGTIME	1		/* timeout passed to ttymsg */
77
78#include <sys/param.h>
79#include <sys/ioctl.h>
80#include <sys/mman.h>
81#include <sys/stat.h>
82#include <sys/wait.h>
83#include <sys/socket.h>
84#include <sys/queue.h>
85#include <sys/uio.h>
86#include <sys/un.h>
87#include <sys/time.h>
88#include <sys/resource.h>
89#include <sys/syslimits.h>
90#include <sys/types.h>
91
92#include <netinet/in.h>
93#include <netdb.h>
94#include <arpa/inet.h>
95
96#include <ctype.h>
97#include <err.h>
98#include <errno.h>
99#include <fcntl.h>
100#include <libutil.h>
101#include <limits.h>
102#include <paths.h>
103#include <signal.h>
104#include <stdio.h>
105#include <stdlib.h>
106#include <string.h>
107#include <sysexits.h>
108#include <unistd.h>
109#include <utmp.h>
110
111#include "pathnames.h"
112#include "ttymsg.h"
113
114#define SYSLOG_NAMES
115#include <sys/syslog.h>
116
117const char	*ConfFile = _PATH_LOGCONF;
118const char	*PidFile = _PATH_LOGPID;
119const char	ctty[] = _PATH_CONSOLE;
120
121#define	dprintf		if (Debug) printf
122
123#define	MAXUNAMES	20	/* maximum number of user names */
124
125/*
126 * Unix sockets.
127 * We have two default sockets, one with 666 permissions,
128 * and one for privileged programs.
129 */
130struct funix {
131	int			s;
132	const char		*name;
133	mode_t			mode;
134	STAILQ_ENTRY(funix)	next;
135};
136struct funix funix_secure =	{ -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
137				{ NULL } };
138struct funix funix_default =	{ -1, _PATH_LOG, DEFFILEMODE,
139				{ &funix_secure } };
140
141STAILQ_HEAD(, funix) funixes =	{ &funix_default,
142				&(funix_secure.next.stqe_next) };
143
144/*
145 * Flags to logmsg().
146 */
147
148#define	IGN_CONS	0x001	/* don't print on console */
149#define	SYNC_FILE	0x002	/* do fsync on file after printing */
150#define	ADDDATE		0x004	/* add a date to the message */
151#define	MARK		0x008	/* this message is a mark */
152#define	ISKERNEL	0x010	/* kernel generated message */
153
154/*
155 * This structure represents the files that will have log
156 * copies printed.
157 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
158 * or if f_type if F_PIPE and f_pid > 0.
159 */
160
161struct filed {
162	struct	filed *f_next;		/* next in linked list */
163	short	f_type;			/* entry type, see below */
164	short	f_file;			/* file descriptor */
165	time_t	f_time;			/* time this was last written */
166	char	*f_host;		/* host from which to recd. */
167	u_char	f_pmask[LOG_NFACILITIES+1];	/* priority mask */
168	u_char	f_pcmp[LOG_NFACILITIES+1];	/* compare priority */
169#define PRI_LT	0x1
170#define PRI_EQ	0x2
171#define PRI_GT	0x4
172	char	*f_program;		/* program this applies to */
173	union {
174		char	f_uname[MAXUNAMES][UT_NAMESIZE+1];
175		struct {
176			char	f_hname[MAXHOSTNAMELEN];
177			struct addrinfo *f_addr;
178
179		} f_forw;		/* forwarding address */
180		char	f_fname[MAXPATHLEN];
181		struct {
182			char	f_pname[MAXPATHLEN];
183			pid_t	f_pid;
184		} f_pipe;
185	} f_un;
186	char	f_prevline[MAXSVLINE];		/* last message logged */
187	char	f_lasttime[16];			/* time of last occurrence */
188	char	f_prevhost[MAXHOSTNAMELEN];	/* host from which recd. */
189	int	f_prevpri;			/* pri of f_prevline */
190	int	f_prevlen;			/* length of f_prevline */
191	int	f_prevcount;			/* repetition cnt of prevline */
192	u_int	f_repeatcount;			/* number of "repeated" msgs */
193	int	f_flags;			/* file-specific flags */
194#define	FFLAG_SYNC 0x01
195#define	FFLAG_NEEDSYNC	0x02
196};
197
198/*
199 * Queue of about-to-be dead processes we should watch out for.
200 */
201
202TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
203struct stailhead *deadq_headp;
204
205struct deadq_entry {
206	pid_t				dq_pid;
207	int				dq_timeout;
208	TAILQ_ENTRY(deadq_entry)	dq_entries;
209};
210
211/*
212 * The timeout to apply to processes waiting on the dead queue.  Unit
213 * of measure is `mark intervals', i.e. 20 minutes by default.
214 * Processes on the dead queue will be terminated after that time.
215 */
216
217#define	 DQ_TIMO_INIT	2
218
219typedef struct deadq_entry *dq_t;
220
221
222/*
223 * Struct to hold records of network addresses that are allowed to log
224 * to us.
225 */
226struct allowedpeer {
227	int isnumeric;
228	u_short port;
229	union {
230		struct {
231			struct sockaddr_storage addr;
232			struct sockaddr_storage mask;
233		} numeric;
234		char *name;
235	} u;
236#define a_addr u.numeric.addr
237#define a_mask u.numeric.mask
238#define a_name u.name
239};
240
241
242/*
243 * Intervals at which we flush out "message repeated" messages,
244 * in seconds after previous message is logged.  After each flush,
245 * we move to the next interval until we reach the largest.
246 */
247int	repeatinterval[] = { 30, 120, 600 };	/* # of secs before flush */
248#define	MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
249#define	REPEATTIME(f)	((f)->f_time + repeatinterval[(f)->f_repeatcount])
250#define	BACKOFF(f)	{ if (++(f)->f_repeatcount > MAXREPEAT) \
251				 (f)->f_repeatcount = MAXREPEAT; \
252			}
253
254/* values for f_type */
255#define F_UNUSED	0		/* unused entry */
256#define F_FILE		1		/* regular file */
257#define F_TTY		2		/* terminal */
258#define F_CONSOLE	3		/* console terminal */
259#define F_FORW		4		/* remote machine */
260#define F_USERS		5		/* list of users */
261#define F_WALL		6		/* everyone logged on */
262#define F_PIPE		7		/* pipe to program */
263
264const char *TypeNames[8] = {
265	"UNUSED",	"FILE",		"TTY",		"CONSOLE",
266	"FORW",		"USERS",	"WALL",		"PIPE"
267};
268
269static struct filed *Files;	/* Log files that we write to */
270static struct filed consfile;	/* Console */
271
272static int	Debug;		/* debug flag */
273static int	resolve = 1;	/* resolve hostname */
274static char	LocalHostName[MAXHOSTNAMELEN];	/* our hostname */
275static const char *LocalDomain;	/* our local domain name */
276static int	*finet;		/* Internet datagram socket */
277static int	fklog = -1;	/* /dev/klog */
278static int	Initialized;	/* set when we have initialized ourselves */
279static int	MarkInterval = 20 * 60;	/* interval between marks in seconds */
280static int	MarkSeq;	/* mark sequence number */
281static int	SecureMode;	/* when true, receive only unix domain socks */
282#ifdef INET6
283static int	family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
284#else
285static int	family = PF_INET; /* protocol family (IPv4 only) */
286#endif
287static int	mask_C1 = 1;	/* mask characters from 0x80 - 0x9F */
288static int	send_to_all;	/* send message to all IPv4/IPv6 addresses */
289static int	use_bootfile;	/* log entire bootfile for every kern msg */
290static int	no_compress;	/* don't compress messages (1=pipes, 2=all) */
291static int	logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
292
293static char	bootfile[MAXLINE+1]; /* booted kernel file */
294
295struct allowedpeer *AllowedPeers; /* List of allowed peers */
296static int	NumAllowed;	/* Number of entries in AllowedPeers */
297static int	RemoteAddDate;	/* Always set the date on remote messages */
298
299static int	UniquePriority;	/* Only log specified priority? */
300static int	LogFacPri;	/* Put facility and priority in log message: */
301				/* 0=no, 1=numeric, 2=names */
302static int	KeepKernFac;	/* Keep remotely logged kernel facility */
303static int	needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
304static struct pidfh *pfh;
305
306volatile sig_atomic_t MarkSet, WantDie;
307
308static int	allowaddr(char *);
309static void	cfline(const char *, struct filed *,
310		    const char *, const char *);
311static const char *cvthname(struct sockaddr *);
312static void	deadq_enter(pid_t, const char *);
313static int	deadq_remove(pid_t);
314static int	decode(const char *, CODE *);
315static void	die(int);
316static void	dodie(int);
317static void	dofsync(void);
318static void	domark(int);
319static void	fprintlog(struct filed *, int, const char *);
320static int	*socksetup(int, const char *);
321static void	init(int);
322static void	logerror(const char *);
323static void	logmsg(int, const char *, const char *, int);
324static void	log_deadchild(pid_t, int, const char *);
325static void	markit(void);
326static int	skip_message(const char *, const char *, int);
327static void	printline(const char *, char *, int);
328static void	printsys(char *);
329static int	p_open(const char *, pid_t *);
330static void	readklog(void);
331static void	reapchild(int);
332static void	usage(void);
333static int	validate(struct sockaddr *, const char *);
334static void	unmapped(struct sockaddr *);
335static void	wallmsg(struct filed *, struct iovec *, const int iovlen);
336static int	waitdaemon(int, int, int);
337static void	timedout(int);
338static void	double_rbuf(int);
339
340int
341main(int argc, char *argv[])
342{
343	int ch, i, fdsrmax = 0, l;
344	struct sockaddr_un sunx, fromunix;
345	struct sockaddr_storage frominet;
346	fd_set *fdsr = NULL;
347	char line[MAXLINE + 1];
348	const char *bindhostname, *hname;
349	struct timeval tv, *tvp;
350	struct sigaction sact;
351	struct funix *fx, *fx1;
352	sigset_t mask;
353	pid_t ppid = 1, spid;
354	socklen_t len;
355
356	if (madvise(NULL, 0, MADV_PROTECT) != 0)
357		dprintf("madvise() failed: %s\n", strerror(errno));
358
359	bindhostname = NULL;
360	while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nop:P:sS:Tuv"))
361	    != -1)
362		switch (ch) {
363		case '4':
364			family = PF_INET;
365			break;
366#ifdef INET6
367		case '6':
368			family = PF_INET6;
369			break;
370#endif
371		case '8':
372			mask_C1 = 0;
373			break;
374		case 'A':
375			send_to_all++;
376			break;
377		case 'a':		/* allow specific network addresses only */
378			if (allowaddr(optarg) == -1)
379				usage();
380			break;
381		case 'b':
382			bindhostname = optarg;
383			break;
384		case 'c':
385			no_compress++;
386			break;
387		case 'C':
388			logflags |= O_CREAT;
389			break;
390		case 'd':		/* debug */
391			Debug++;
392			break;
393		case 'f':		/* configuration file */
394			ConfFile = optarg;
395			break;
396		case 'k':		/* keep remote kern fac */
397			KeepKernFac = 1;
398			break;
399		case 'l':
400		    {
401			long	perml;
402			mode_t	mode;
403			char	*name, *ep;
404
405			if (optarg[0] == '/') {
406				mode = DEFFILEMODE;
407				name = optarg;
408			} else if ((name = strchr(optarg, ':')) != NULL) {
409				*name++ = '\0';
410				if (name[0] != '/')
411					errx(1, "socket name must be absolute "
412					    "path");
413				if (isdigit(*optarg)) {
414					perml = strtol(optarg, &ep, 8);
415				    if (*ep || perml < 0 ||
416					perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
417					    errx(1, "invalid mode %s, exiting",
418						optarg);
419				    mode = (mode_t )perml;
420				} else
421					errx(1, "invalid mode %s, exiting",
422					    optarg);
423			} else	/* doesn't begin with '/', and no ':' */
424				errx(1, "can't parse path %s", optarg);
425
426			if (strlen(name) >= sizeof(sunx.sun_path))
427				errx(1, "%s path too long, exiting", name);
428			if ((fx = malloc(sizeof(struct funix))) == NULL)
429				errx(1, "malloc failed");
430			fx->s = -1;
431			fx->name = name;
432			fx->mode = mode;
433			STAILQ_INSERT_TAIL(&funixes, fx, next);
434			break;
435		   }
436		case 'm':		/* mark interval */
437			MarkInterval = atoi(optarg) * 60;
438			break;
439		case 'n':
440			resolve = 0;
441			break;
442		case 'o':
443			use_bootfile = 1;
444			break;
445		case 'p':		/* path */
446			if (strlen(optarg) >= sizeof(sunx.sun_path))
447				errx(1, "%s path too long, exiting", optarg);
448			funix_default.name = optarg;
449			break;
450		case 'P':		/* path for alt. PID */
451			PidFile = optarg;
452			break;
453		case 's':		/* no network mode */
454			SecureMode++;
455			break;
456		case 'S':		/* path for privileged originator */
457			if (strlen(optarg) >= sizeof(sunx.sun_path))
458				errx(1, "%s path too long, exiting", optarg);
459			funix_secure.name = optarg;
460			break;
461		case 'T':
462			RemoteAddDate = 1;
463			break;
464		case 'u':		/* only log specified priority */
465			UniquePriority++;
466			break;
467		case 'v':		/* log facility and priority */
468		  	LogFacPri++;
469			break;
470		default:
471			usage();
472		}
473	if ((argc -= optind) != 0)
474		usage();
475
476	pfh = pidfile_open(PidFile, 0600, &spid);
477	if (pfh == NULL) {
478		if (errno == EEXIST)
479			errx(1, "syslogd already running, pid: %d", spid);
480		warn("cannot open pid file");
481	}
482
483	if (!Debug) {
484		ppid = waitdaemon(0, 0, 30);
485		if (ppid < 0) {
486			warn("could not become daemon");
487			pidfile_remove(pfh);
488			exit(1);
489		}
490	} else {
491		setlinebuf(stdout);
492	}
493
494	if (NumAllowed)
495		endservent();
496
497	consfile.f_type = F_CONSOLE;
498	(void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
499	    sizeof(consfile.f_un.f_fname));
500	(void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
501	(void)signal(SIGTERM, dodie);
502	(void)signal(SIGINT, Debug ? dodie : SIG_IGN);
503	(void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
504	/*
505	 * We don't want the SIGCHLD and SIGHUP handlers to interfere
506	 * with each other; they are likely candidates for being called
507	 * simultaneously (SIGHUP closes pipe descriptor, process dies,
508	 * SIGCHLD happens).
509	 */
510	sigemptyset(&mask);
511	sigaddset(&mask, SIGHUP);
512	sact.sa_handler = reapchild;
513	sact.sa_mask = mask;
514	sact.sa_flags = SA_RESTART;
515	(void)sigaction(SIGCHLD, &sact, NULL);
516	(void)signal(SIGALRM, domark);
517	(void)signal(SIGPIPE, SIG_IGN);	/* We'll catch EPIPE instead. */
518	(void)alarm(TIMERINTVL);
519
520	TAILQ_INIT(&deadq_head);
521
522#ifndef SUN_LEN
523#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
524#endif
525	STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) {
526		(void)unlink(fx->name);
527		memset(&sunx, 0, sizeof(sunx));
528		sunx.sun_family = AF_LOCAL;
529		(void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path));
530		fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0);
531		if (fx->s < 0 ||
532		    bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
533		    chmod(fx->name, fx->mode) < 0) {
534			(void)snprintf(line, sizeof line,
535					"cannot create %s", fx->name);
536			logerror(line);
537			dprintf("cannot create %s (%d)\n", fx->name, errno);
538			if (fx == &funix_default || fx == &funix_secure)
539				die(0);
540			else {
541				STAILQ_REMOVE(&funixes, fx, funix, next);
542				continue;
543			}
544			double_rbuf(fx->s);
545		}
546	}
547	if (SecureMode <= 1)
548		finet = socksetup(family, bindhostname);
549
550	if (finet) {
551		if (SecureMode) {
552			for (i = 0; i < *finet; i++) {
553				if (shutdown(finet[i+1], SHUT_RD) < 0) {
554					logerror("shutdown");
555					if (!Debug)
556						die(0);
557				}
558			}
559		} else {
560			dprintf("listening on inet and/or inet6 socket\n");
561		}
562		dprintf("sending on inet and/or inet6 socket\n");
563	}
564
565	if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
566		if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
567			fklog = -1;
568	if (fklog < 0)
569		dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
570
571	/* tuck my process id away */
572	pidfile_write(pfh);
573
574	dprintf("off & running....\n");
575
576	init(0);
577	/* prevent SIGHUP and SIGCHLD handlers from running in parallel */
578	sigemptyset(&mask);
579	sigaddset(&mask, SIGCHLD);
580	sact.sa_handler = init;
581	sact.sa_mask = mask;
582	sact.sa_flags = SA_RESTART;
583	(void)sigaction(SIGHUP, &sact, NULL);
584
585	tvp = &tv;
586	tv.tv_sec = tv.tv_usec = 0;
587
588	if (fklog != -1 && fklog > fdsrmax)
589		fdsrmax = fklog;
590	if (finet && !SecureMode) {
591		for (i = 0; i < *finet; i++) {
592		    if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
593			fdsrmax = finet[i+1];
594		}
595	}
596	STAILQ_FOREACH(fx, &funixes, next)
597		if (fx->s > fdsrmax)
598			fdsrmax = fx->s;
599
600	fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
601	    sizeof(fd_mask));
602	if (fdsr == NULL)
603		errx(1, "calloc fd_set");
604
605	for (;;) {
606		if (MarkSet)
607			markit();
608		if (WantDie)
609			die(WantDie);
610
611		bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
612		    sizeof(fd_mask));
613
614		if (fklog != -1)
615			FD_SET(fklog, fdsr);
616		if (finet && !SecureMode) {
617			for (i = 0; i < *finet; i++) {
618				if (finet[i+1] != -1)
619					FD_SET(finet[i+1], fdsr);
620			}
621		}
622		STAILQ_FOREACH(fx, &funixes, next)
623			FD_SET(fx->s, fdsr);
624
625		i = select(fdsrmax+1, fdsr, NULL, NULL,
626		    needdofsync ? &tv : tvp);
627		switch (i) {
628		case 0:
629			dofsync();
630			needdofsync = 0;
631			if (tvp) {
632				tvp = NULL;
633				if (ppid != 1)
634					kill(ppid, SIGALRM);
635			}
636			continue;
637		case -1:
638			if (errno != EINTR)
639				logerror("select");
640			continue;
641		}
642		if (fklog != -1 && FD_ISSET(fklog, fdsr))
643			readklog();
644		if (finet && !SecureMode) {
645			for (i = 0; i < *finet; i++) {
646				if (FD_ISSET(finet[i+1], fdsr)) {
647					len = sizeof(frominet);
648					l = recvfrom(finet[i+1], line, MAXLINE,
649					     0, (struct sockaddr *)&frominet,
650					     &len);
651					if (l > 0) {
652						line[l] = '\0';
653						hname = cvthname((struct sockaddr *)&frominet);
654						unmapped((struct sockaddr *)&frominet);
655						if (validate((struct sockaddr *)&frominet, hname))
656							printline(hname, line, RemoteAddDate ? ADDDATE : 0);
657					} else if (l < 0 && errno != EINTR)
658						logerror("recvfrom inet");
659				}
660			}
661		}
662		STAILQ_FOREACH(fx, &funixes, next) {
663			if (FD_ISSET(fx->s, fdsr)) {
664				len = sizeof(fromunix);
665				l = recvfrom(fx->s, line, MAXLINE, 0,
666				    (struct sockaddr *)&fromunix, &len);
667				if (l > 0) {
668					line[l] = '\0';
669					printline(LocalHostName, line, 0);
670				} else if (l < 0 && errno != EINTR)
671					logerror("recvfrom unix");
672			}
673		}
674	}
675	if (fdsr)
676		free(fdsr);
677}
678
679static void
680unmapped(struct sockaddr *sa)
681{
682	struct sockaddr_in6 *sin6;
683	struct sockaddr_in sin4;
684
685	if (sa->sa_family != AF_INET6)
686		return;
687	if (sa->sa_len != sizeof(struct sockaddr_in6) ||
688	    sizeof(sin4) > sa->sa_len)
689		return;
690	sin6 = (struct sockaddr_in6 *)sa;
691	if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
692		return;
693
694	memset(&sin4, 0, sizeof(sin4));
695	sin4.sin_family = AF_INET;
696	sin4.sin_len = sizeof(struct sockaddr_in);
697	memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
698	       sizeof(sin4.sin_addr));
699	sin4.sin_port = sin6->sin6_port;
700
701	memcpy(sa, &sin4, sin4.sin_len);
702}
703
704static void
705usage(void)
706{
707
708	fprintf(stderr, "%s\n%s\n%s\n%s\n",
709		"usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]",
710		"               [-b bind_address] [-f config_file]",
711		"               [-l [mode:]path] [-m mark_interval]",
712		"               [-P pid_file] [-p log_socket]");
713	exit(1);
714}
715
716/*
717 * Take a raw input line, decode the message, and print the message
718 * on the appropriate log files.
719 */
720static void
721printline(const char *hname, char *msg, int flags)
722{
723	char *p, *q;
724	long n;
725	int c, pri;
726	char line[MAXLINE + 1];
727
728	/* test for special codes */
729	p = msg;
730	pri = DEFUPRI;
731	if (*p == '<') {
732		errno = 0;
733		n = strtol(p + 1, &q, 10);
734		if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
735			p = q + 1;
736			pri = n;
737		}
738	}
739	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
740		pri = DEFUPRI;
741
742	/*
743	 * Don't allow users to log kernel messages.
744	 * NOTE: since LOG_KERN == 0 this will also match
745	 *       messages with no facility specified.
746	 */
747	if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
748		pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
749
750	q = line;
751
752	while ((c = (unsigned char)*p++) != '\0' &&
753	    q < &line[sizeof(line) - 4]) {
754		if (mask_C1 && (c & 0x80) && c < 0xA0) {
755			c &= 0x7F;
756			*q++ = 'M';
757			*q++ = '-';
758		}
759		if (isascii(c) && iscntrl(c)) {
760			if (c == '\n') {
761				*q++ = ' ';
762			} else if (c == '\t') {
763				*q++ = '\t';
764			} else {
765				*q++ = '^';
766				*q++ = c ^ 0100;
767			}
768		} else {
769			*q++ = c;
770		}
771	}
772	*q = '\0';
773
774	logmsg(pri, line, hname, flags);
775}
776
777/*
778 * Read /dev/klog while data are available, split into lines.
779 */
780static void
781readklog(void)
782{
783	char *p, *q, line[MAXLINE + 1];
784	int len, i;
785
786	len = 0;
787	for (;;) {
788		i = read(fklog, line + len, MAXLINE - 1 - len);
789		if (i > 0) {
790			line[i + len] = '\0';
791		} else {
792			if (i < 0 && errno != EINTR && errno != EAGAIN) {
793				logerror("klog");
794				fklog = -1;
795			}
796			break;
797		}
798
799		for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
800			*q = '\0';
801			printsys(p);
802		}
803		len = strlen(p);
804		if (len >= MAXLINE - 1) {
805			printsys(p);
806			len = 0;
807		}
808		if (len > 0)
809			memmove(line, p, len + 1);
810	}
811	if (len > 0)
812		printsys(line);
813}
814
815/*
816 * Take a raw input line from /dev/klog, format similar to syslog().
817 */
818static void
819printsys(char *msg)
820{
821	char *p, *q;
822	long n;
823	int flags, isprintf, pri;
824
825	flags = ISKERNEL | SYNC_FILE | ADDDATE;	/* fsync after write */
826	p = msg;
827	pri = DEFSPRI;
828	isprintf = 1;
829	if (*p == '<') {
830		errno = 0;
831		n = strtol(p + 1, &q, 10);
832		if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
833			p = q + 1;
834			pri = n;
835			isprintf = 0;
836		}
837	}
838	/*
839	 * Kernel printf's and LOG_CONSOLE messages have been displayed
840	 * on the console already.
841	 */
842	if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
843		flags |= IGN_CONS;
844	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
845		pri = DEFSPRI;
846	logmsg(pri, p, LocalHostName, flags);
847}
848
849static time_t	now;
850
851/*
852 * Match a program or host name against a specification.
853 * Return a non-0 value if the message must be ignored
854 * based on the specification.
855 */
856static int
857skip_message(const char *name, const char *spec, int checkcase)
858{
859	const char *s;
860	char prev, next;
861	int exclude = 0;
862	/* Behaviour on explicit match */
863
864	if (spec == NULL)
865		return 0;
866	switch (*spec) {
867	case '-':
868		exclude = 1;
869		/*FALLTHROUGH*/
870	case '+':
871		spec++;
872		break;
873	default:
874		break;
875	}
876	if (checkcase)
877		s = strstr (spec, name);
878	else
879		s = strcasestr (spec, name);
880
881	if (s != NULL) {
882		prev = (s == spec ? ',' : *(s - 1));
883		next = *(s + strlen (name));
884
885		if (prev == ',' && (next == '\0' || next == ','))
886			/* Explicit match: skip iff the spec is an
887			   exclusive one. */
888			return exclude;
889	}
890
891	/* No explicit match for this name: skip the message iff
892	   the spec is an inclusive one. */
893	return !exclude;
894}
895
896/*
897 * Log a message to the appropriate log files, users, etc. based on
898 * the priority.
899 */
900static void
901logmsg(int pri, const char *msg, const char *from, int flags)
902{
903	struct filed *f;
904	int i, fac, msglen, omask, prilev;
905	const char *timestamp;
906 	char prog[NAME_MAX+1];
907	char buf[MAXLINE+1];
908
909	dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
910	    pri, flags, from, msg);
911
912	omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
913
914	/*
915	 * Check to see if msg looks non-standard.
916	 */
917	msglen = strlen(msg);
918	if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
919	    msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
920		flags |= ADDDATE;
921
922	(void)time(&now);
923	if (flags & ADDDATE) {
924		timestamp = ctime(&now) + 4;
925	} else {
926		timestamp = msg;
927		msg += 16;
928		msglen -= 16;
929	}
930
931	/* skip leading blanks */
932	while (isspace(*msg)) {
933		msg++;
934		msglen--;
935	}
936
937	/* extract facility and priority level */
938	if (flags & MARK)
939		fac = LOG_NFACILITIES;
940	else
941		fac = LOG_FAC(pri);
942
943	/* Check maximum facility number. */
944	if (fac > LOG_NFACILITIES) {
945		(void)sigsetmask(omask);
946		return;
947	}
948
949	prilev = LOG_PRI(pri);
950
951	/* extract program name */
952	for (i = 0; i < NAME_MAX; i++) {
953		if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
954		    msg[i] == '/' || isspace(msg[i]))
955			break;
956		prog[i] = msg[i];
957	}
958	prog[i] = 0;
959
960	/* add kernel prefix for kernel messages */
961	if (flags & ISKERNEL) {
962		snprintf(buf, sizeof(buf), "%s: %s",
963		    use_bootfile ? bootfile : "kernel", msg);
964		msg = buf;
965		msglen = strlen(buf);
966	}
967
968	/* log the message to the particular outputs */
969	if (!Initialized) {
970		f = &consfile;
971		/*
972		 * Open in non-blocking mode to avoid hangs during open
973		 * and close(waiting for the port to drain).
974		 */
975		f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
976
977		if (f->f_file >= 0) {
978			(void)strlcpy(f->f_lasttime, timestamp,
979				sizeof(f->f_lasttime));
980			fprintlog(f, flags, msg);
981			(void)close(f->f_file);
982		}
983		(void)sigsetmask(omask);
984		return;
985	}
986	for (f = Files; f; f = f->f_next) {
987		/* skip messages that are incorrect priority */
988		if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
989		     ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
990		     ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
991		     )
992		    || f->f_pmask[fac] == INTERNAL_NOPRI)
993			continue;
994
995		/* skip messages with the incorrect hostname */
996		if (skip_message(from, f->f_host, 0))
997			continue;
998
999		/* skip messages with the incorrect program name */
1000		if (skip_message(prog, f->f_program, 1))
1001			continue;
1002
1003		/* skip message to console if it has already been printed */
1004		if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1005			continue;
1006
1007		/* don't output marks to recently written files */
1008		if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1009			continue;
1010
1011		/*
1012		 * suppress duplicate lines to this file
1013		 */
1014		if (no_compress - (f->f_type != F_PIPE) < 1 &&
1015		    (flags & MARK) == 0 && msglen == f->f_prevlen &&
1016		    f->f_prevline && !strcmp(msg, f->f_prevline) &&
1017		    !strcasecmp(from, f->f_prevhost)) {
1018			(void)strlcpy(f->f_lasttime, timestamp,
1019				sizeof(f->f_lasttime));
1020			f->f_prevcount++;
1021			dprintf("msg repeated %d times, %ld sec of %d\n",
1022			    f->f_prevcount, (long)(now - f->f_time),
1023			    repeatinterval[f->f_repeatcount]);
1024			/*
1025			 * If domark would have logged this by now,
1026			 * flush it now (so we don't hold isolated messages),
1027			 * but back off so we'll flush less often
1028			 * in the future.
1029			 */
1030			if (now > REPEATTIME(f)) {
1031				fprintlog(f, flags, (char *)NULL);
1032				BACKOFF(f);
1033			}
1034		} else {
1035			/* new line, save it */
1036			if (f->f_prevcount)
1037				fprintlog(f, 0, (char *)NULL);
1038			f->f_repeatcount = 0;
1039			f->f_prevpri = pri;
1040			(void)strlcpy(f->f_lasttime, timestamp,
1041				sizeof(f->f_lasttime));
1042			(void)strlcpy(f->f_prevhost, from,
1043			    sizeof(f->f_prevhost));
1044			if (msglen < MAXSVLINE) {
1045				f->f_prevlen = msglen;
1046				(void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
1047				fprintlog(f, flags, (char *)NULL);
1048			} else {
1049				f->f_prevline[0] = 0;
1050				f->f_prevlen = 0;
1051				fprintlog(f, flags, msg);
1052			}
1053		}
1054	}
1055	(void)sigsetmask(omask);
1056}
1057
1058static void
1059dofsync(void)
1060{
1061	struct filed *f;
1062
1063	for (f = Files; f; f = f->f_next) {
1064		if ((f->f_type == F_FILE) &&
1065		    (f->f_flags & FFLAG_NEEDSYNC)) {
1066			f->f_flags &= ~FFLAG_NEEDSYNC;
1067			(void)fsync(f->f_file);
1068		}
1069	}
1070}
1071
1072#define IOV_SIZE 7
1073static void
1074fprintlog(struct filed *f, int flags, const char *msg)
1075{
1076	struct iovec iov[IOV_SIZE];
1077	struct iovec *v;
1078	struct addrinfo *r;
1079	int i, l, lsent = 0;
1080	char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
1081	char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
1082	const char *msgret;
1083
1084	v = iov;
1085	if (f->f_type == F_WALL) {
1086		v->iov_base = greetings;
1087		/* The time displayed is not synchornized with the other log
1088		 * destinations (like messages).  Following fragment was using
1089		 * ctime(&now), which was updating the time every 30 sec.
1090		 * With f_lasttime, time is synchronized correctly.
1091		 */
1092		v->iov_len = snprintf(greetings, sizeof greetings,
1093		    "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
1094		    f->f_prevhost, f->f_lasttime);
1095		if (v->iov_len > 0)
1096			v++;
1097		v->iov_base = nul;
1098		v->iov_len = 0;
1099		v++;
1100	} else {
1101		v->iov_base = f->f_lasttime;
1102		v->iov_len = strlen(f->f_lasttime);
1103		v++;
1104		v->iov_base = space;
1105		v->iov_len = 1;
1106		v++;
1107	}
1108
1109	if (LogFacPri) {
1110	  	static char fp_buf[30];	/* Hollow laugh */
1111		int fac = f->f_prevpri & LOG_FACMASK;
1112		int pri = LOG_PRI(f->f_prevpri);
1113		const char *f_s = NULL;
1114		char f_n[5];	/* Hollow laugh */
1115		const char *p_s = NULL;
1116		char p_n[5];	/* Hollow laugh */
1117
1118		if (LogFacPri > 1) {
1119		  CODE *c;
1120
1121		  for (c = facilitynames; c->c_name; c++) {
1122		    if (c->c_val == fac) {
1123		      f_s = c->c_name;
1124		      break;
1125		    }
1126		  }
1127		  for (c = prioritynames; c->c_name; c++) {
1128		    if (c->c_val == pri) {
1129		      p_s = c->c_name;
1130		      break;
1131		    }
1132		  }
1133		}
1134		if (!f_s) {
1135		  snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1136		  f_s = f_n;
1137		}
1138		if (!p_s) {
1139		  snprintf(p_n, sizeof p_n, "%d", pri);
1140		  p_s = p_n;
1141		}
1142		snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
1143		v->iov_base = fp_buf;
1144		v->iov_len = strlen(fp_buf);
1145	} else {
1146		v->iov_base = nul;
1147		v->iov_len = 0;
1148	}
1149	v++;
1150
1151	v->iov_base = f->f_prevhost;
1152	v->iov_len = strlen(v->iov_base);
1153	v++;
1154	v->iov_base = space;
1155	v->iov_len = 1;
1156	v++;
1157
1158	if (msg) {
1159		wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1160		if (wmsg == NULL) {
1161			logerror("strdup");
1162			exit(1);
1163		}
1164		v->iov_base = wmsg;
1165		v->iov_len = strlen(msg);
1166	} else if (f->f_prevcount > 1) {
1167		v->iov_base = repbuf;
1168		v->iov_len = snprintf(repbuf, sizeof repbuf,
1169		    "last message repeated %d times", f->f_prevcount);
1170	} else if (f->f_prevline) {
1171		v->iov_base = f->f_prevline;
1172		v->iov_len = f->f_prevlen;
1173	} else {
1174		return;
1175	}
1176	v++;
1177
1178	dprintf("Logging to %s", TypeNames[f->f_type]);
1179	f->f_time = now;
1180
1181	switch (f->f_type) {
1182		int port;
1183	case F_UNUSED:
1184		dprintf("\n");
1185		break;
1186
1187	case F_FORW:
1188		port = (int)ntohs(((struct sockaddr_in *)
1189			    (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1190		if (port != 514) {
1191			dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port);
1192		} else {
1193			dprintf(" %s\n", f->f_un.f_forw.f_hname);
1194		}
1195		/* check for local vs remote messages */
1196		if (strcasecmp(f->f_prevhost, LocalHostName))
1197			l = snprintf(line, sizeof line - 1,
1198			    "<%d>%.15s Forwarded from %s: %s",
1199			    f->f_prevpri, (char *)iov[0].iov_base,
1200			    f->f_prevhost, (char *)iov[5].iov_base);
1201		else
1202			l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1203			     f->f_prevpri, (char *)iov[0].iov_base,
1204			    (char *)iov[5].iov_base);
1205		if (l < 0)
1206			l = 0;
1207		else if (l > MAXLINE)
1208			l = MAXLINE;
1209
1210		if (finet) {
1211			for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1212				for (i = 0; i < *finet; i++) {
1213#if 0
1214					/*
1215					 * should we check AF first, or just
1216					 * trial and error? FWD
1217					 */
1218					if (r->ai_family ==
1219					    address_family_of(finet[i+1]))
1220#endif
1221					lsent = sendto(finet[i+1], line, l, 0,
1222					    r->ai_addr, r->ai_addrlen);
1223					if (lsent == l)
1224						break;
1225				}
1226				if (lsent == l && !send_to_all)
1227					break;
1228			}
1229			dprintf("lsent/l: %d/%d\n", lsent, l);
1230			if (lsent != l) {
1231				int e = errno;
1232				logerror("sendto");
1233				errno = e;
1234				switch (errno) {
1235				case ENOBUFS:
1236				case ENETDOWN:
1237				case EHOSTUNREACH:
1238				case EHOSTDOWN:
1239					break;
1240				/* case EBADF: */
1241				/* case EACCES: */
1242				/* case ENOTSOCK: */
1243				/* case EFAULT: */
1244				/* case EMSGSIZE: */
1245				/* case EAGAIN: */
1246				/* case ENOBUFS: */
1247				/* case ECONNREFUSED: */
1248				default:
1249					dprintf("removing entry\n");
1250					f->f_type = F_UNUSED;
1251					break;
1252				}
1253			}
1254		}
1255		break;
1256
1257	case F_FILE:
1258		dprintf(" %s\n", f->f_un.f_fname);
1259		v->iov_base = lf;
1260		v->iov_len = 1;
1261		if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1262			/*
1263			 * If writev(2) fails for potentially transient errors
1264			 * like the filesystem being full, ignore it.
1265			 * Otherwise remove this logfile from the list.
1266			 */
1267			if (errno != ENOSPC) {
1268				int e = errno;
1269				(void)close(f->f_file);
1270				f->f_type = F_UNUSED;
1271				errno = e;
1272				logerror(f->f_un.f_fname);
1273			}
1274		} else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1275			f->f_flags |= FFLAG_NEEDSYNC;
1276			needdofsync = 1;
1277		}
1278		break;
1279
1280	case F_PIPE:
1281		dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1282		v->iov_base = lf;
1283		v->iov_len = 1;
1284		if (f->f_un.f_pipe.f_pid == 0) {
1285			if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1286						&f->f_un.f_pipe.f_pid)) < 0) {
1287				f->f_type = F_UNUSED;
1288				logerror(f->f_un.f_pipe.f_pname);
1289				break;
1290			}
1291		}
1292		if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1293			int e = errno;
1294			(void)close(f->f_file);
1295			if (f->f_un.f_pipe.f_pid > 0)
1296				deadq_enter(f->f_un.f_pipe.f_pid,
1297					    f->f_un.f_pipe.f_pname);
1298			f->f_un.f_pipe.f_pid = 0;
1299			errno = e;
1300			logerror(f->f_un.f_pipe.f_pname);
1301		}
1302		break;
1303
1304	case F_CONSOLE:
1305		if (flags & IGN_CONS) {
1306			dprintf(" (ignored)\n");
1307			break;
1308		}
1309		/* FALLTHROUGH */
1310
1311	case F_TTY:
1312		dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1313		v->iov_base = crlf;
1314		v->iov_len = 2;
1315
1316		errno = 0;	/* ttymsg() only sometimes returns an errno */
1317		if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) {
1318			f->f_type = F_UNUSED;
1319			logerror(msgret);
1320		}
1321		break;
1322
1323	case F_USERS:
1324	case F_WALL:
1325		dprintf("\n");
1326		v->iov_base = crlf;
1327		v->iov_len = 2;
1328		wallmsg(f, iov, IOV_SIZE);
1329		break;
1330	}
1331	f->f_prevcount = 0;
1332	free(wmsg);
1333}
1334
1335/*
1336 *  WALLMSG -- Write a message to the world at large
1337 *
1338 *	Write the specified message to either the entire
1339 *	world, or a list of approved users.
1340 */
1341static void
1342wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1343{
1344	static int reenter;			/* avoid calling ourselves */
1345	FILE *uf;
1346	struct utmp ut;
1347	int i;
1348	const char *p;
1349	char line[sizeof(ut.ut_line) + 1];
1350
1351	if (reenter++)
1352		return;
1353	if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1354		logerror(_PATH_UTMP);
1355		reenter = 0;
1356		return;
1357	}
1358	/* NOSTRICT */
1359	while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1360		if (ut.ut_name[0] == '\0')
1361			continue;
1362		/* We must use strncpy since ut_* may not be NUL terminated. */
1363		strncpy(line, ut.ut_line, sizeof(line) - 1);
1364		line[sizeof(line) - 1] = '\0';
1365		if (f->f_type == F_WALL) {
1366			if ((p = ttymsg(iov, iovlen, line, TTYMSGTIME)) !=
1367			    NULL) {
1368				errno = 0;	/* already in msg */
1369				logerror(p);
1370			}
1371			continue;
1372		}
1373		/* should we send the message to this user? */
1374		for (i = 0; i < MAXUNAMES; i++) {
1375			if (!f->f_un.f_uname[i][0])
1376				break;
1377			if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1378			    UT_NAMESIZE)) {
1379				if ((p = ttymsg(iov, iovlen, line, TTYMSGTIME))
1380				    != NULL) {
1381					errno = 0;	/* already in msg */
1382					logerror(p);
1383				}
1384				break;
1385			}
1386		}
1387	}
1388	(void)fclose(uf);
1389	reenter = 0;
1390}
1391
1392static void
1393reapchild(int signo __unused)
1394{
1395	int status;
1396	pid_t pid;
1397	struct filed *f;
1398
1399	while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1400		if (!Initialized)
1401			/* Don't tell while we are initting. */
1402			continue;
1403
1404		/* First, look if it's a process from the dead queue. */
1405		if (deadq_remove(pid))
1406			goto oncemore;
1407
1408		/* Now, look in list of active processes. */
1409		for (f = Files; f; f = f->f_next)
1410			if (f->f_type == F_PIPE &&
1411			    f->f_un.f_pipe.f_pid == pid) {
1412				(void)close(f->f_file);
1413				f->f_un.f_pipe.f_pid = 0;
1414				log_deadchild(pid, status,
1415					      f->f_un.f_pipe.f_pname);
1416				break;
1417			}
1418	  oncemore:
1419		continue;
1420	}
1421}
1422
1423/*
1424 * Return a printable representation of a host address.
1425 */
1426static const char *
1427cvthname(struct sockaddr *f)
1428{
1429	int error, hl;
1430	sigset_t omask, nmask;
1431	static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1432
1433	error = getnameinfo((struct sockaddr *)f,
1434			    ((struct sockaddr *)f)->sa_len,
1435			    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
1436	dprintf("cvthname(%s)\n", ip);
1437
1438	if (error) {
1439		dprintf("Malformed from address %s\n", gai_strerror(error));
1440		return ("???");
1441	}
1442	if (!resolve)
1443		return (ip);
1444
1445	sigemptyset(&nmask);
1446	sigaddset(&nmask, SIGHUP);
1447	sigprocmask(SIG_BLOCK, &nmask, &omask);
1448	error = getnameinfo((struct sockaddr *)f,
1449			    ((struct sockaddr *)f)->sa_len,
1450			    hname, sizeof hname, NULL, 0, NI_NAMEREQD);
1451	sigprocmask(SIG_SETMASK, &omask, NULL);
1452	if (error) {
1453		dprintf("Host name for your address (%s) unknown\n", ip);
1454		return (ip);
1455	}
1456	hl = strlen(hname);
1457	if (hl > 0 && hname[hl-1] == '.')
1458		hname[--hl] = '\0';
1459	trimdomain(hname, hl);
1460	return (hname);
1461}
1462
1463static void
1464dodie(int signo)
1465{
1466
1467	WantDie = signo;
1468}
1469
1470static void
1471domark(int signo __unused)
1472{
1473
1474	MarkSet = 1;
1475}
1476
1477/*
1478 * Print syslogd errors some place.
1479 */
1480static void
1481logerror(const char *type)
1482{
1483	char buf[512];
1484	static int recursed = 0;
1485
1486	/* If there's an error while trying to log an error, give up. */
1487	if (recursed)
1488		return;
1489	recursed++;
1490	if (errno)
1491		(void)snprintf(buf,
1492		    sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1493	else
1494		(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1495	errno = 0;
1496	dprintf("%s\n", buf);
1497	logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1498	recursed--;
1499}
1500
1501static void
1502die(int signo)
1503{
1504	struct filed *f;
1505	struct funix *fx;
1506	int was_initialized;
1507	char buf[100];
1508
1509	was_initialized = Initialized;
1510	Initialized = 0;	/* Don't log SIGCHLDs. */
1511	for (f = Files; f != NULL; f = f->f_next) {
1512		/* flush any pending output */
1513		if (f->f_prevcount)
1514			fprintlog(f, 0, (char *)NULL);
1515		if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) {
1516			(void)close(f->f_file);
1517			f->f_un.f_pipe.f_pid = 0;
1518		}
1519	}
1520	Initialized = was_initialized;
1521	if (signo) {
1522		dprintf("syslogd: exiting on signal %d\n", signo);
1523		(void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1524		errno = 0;
1525		logerror(buf);
1526	}
1527	STAILQ_FOREACH(fx, &funixes, next)
1528		(void)unlink(fx->name);
1529	pidfile_remove(pfh);
1530
1531	exit(1);
1532}
1533
1534/*
1535 *  INIT -- Initialize syslogd from configuration table
1536 */
1537static void
1538init(int signo)
1539{
1540	int i;
1541	FILE *cf;
1542	struct filed *f, *next, **nextp;
1543	char *p;
1544	char cline[LINE_MAX];
1545 	char prog[NAME_MAX+1];
1546	char host[MAXHOSTNAMELEN];
1547	char oldLocalHostName[MAXHOSTNAMELEN];
1548	char hostMsg[2*MAXHOSTNAMELEN+40];
1549	char bootfileMsg[LINE_MAX];
1550
1551	dprintf("init\n");
1552
1553	/*
1554	 * Load hostname (may have changed).
1555	 */
1556	if (signo != 0)
1557		(void)strlcpy(oldLocalHostName, LocalHostName,
1558		    sizeof(oldLocalHostName));
1559	if (gethostname(LocalHostName, sizeof(LocalHostName)))
1560		err(EX_OSERR, "gethostname() failed");
1561	if ((p = strchr(LocalHostName, '.')) != NULL) {
1562		*p++ = '\0';
1563		LocalDomain = p;
1564	} else {
1565		LocalDomain = "";
1566	}
1567
1568	/*
1569	 *  Close all open log files.
1570	 */
1571	Initialized = 0;
1572	for (f = Files; f != NULL; f = next) {
1573		/* flush any pending output */
1574		if (f->f_prevcount)
1575			fprintlog(f, 0, (char *)NULL);
1576
1577		switch (f->f_type) {
1578		case F_FILE:
1579		case F_FORW:
1580		case F_CONSOLE:
1581		case F_TTY:
1582			(void)close(f->f_file);
1583			break;
1584		case F_PIPE:
1585			if (f->f_un.f_pipe.f_pid > 0) {
1586				(void)close(f->f_file);
1587				deadq_enter(f->f_un.f_pipe.f_pid,
1588					    f->f_un.f_pipe.f_pname);
1589			}
1590			f->f_un.f_pipe.f_pid = 0;
1591			break;
1592		}
1593		next = f->f_next;
1594		if (f->f_program) free(f->f_program);
1595		if (f->f_host) free(f->f_host);
1596		free((char *)f);
1597	}
1598	Files = NULL;
1599	nextp = &Files;
1600
1601	/* open the configuration file */
1602	if ((cf = fopen(ConfFile, "r")) == NULL) {
1603		dprintf("cannot open %s\n", ConfFile);
1604		*nextp = (struct filed *)calloc(1, sizeof(*f));
1605		if (*nextp == NULL) {
1606			logerror("calloc");
1607			exit(1);
1608		}
1609		cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1610		(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1611		if ((*nextp)->f_next == NULL) {
1612			logerror("calloc");
1613			exit(1);
1614		}
1615		cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1616		Initialized = 1;
1617		return;
1618	}
1619
1620	/*
1621	 *  Foreach line in the conf table, open that file.
1622	 */
1623	f = NULL;
1624	(void)strlcpy(host, "*", sizeof(host));
1625	(void)strlcpy(prog, "*", sizeof(prog));
1626	while (fgets(cline, sizeof(cline), cf) != NULL) {
1627		/*
1628		 * check for end-of-section, comments, strip off trailing
1629		 * spaces and newline character. #!prog is treated specially:
1630		 * following lines apply only to that program.
1631		 */
1632		for (p = cline; isspace(*p); ++p)
1633			continue;
1634		if (*p == 0)
1635			continue;
1636		if (*p == '#') {
1637			p++;
1638			if (*p != '!' && *p != '+' && *p != '-')
1639				continue;
1640		}
1641		if (*p == '+' || *p == '-') {
1642			host[0] = *p++;
1643			while (isspace(*p))
1644				p++;
1645			if ((!*p) || (*p == '*')) {
1646				(void)strlcpy(host, "*", sizeof(host));
1647				continue;
1648			}
1649			if (*p == '@')
1650				p = LocalHostName;
1651			for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1652				if (!isalnum(*p) && *p != '.' && *p != '-'
1653				    && *p != ',' && *p != ':' && *p != '%')
1654					break;
1655				host[i] = *p++;
1656			}
1657			host[i] = '\0';
1658			continue;
1659		}
1660		if (*p == '!') {
1661			p++;
1662			while (isspace(*p)) p++;
1663			if ((!*p) || (*p == '*')) {
1664				(void)strlcpy(prog, "*", sizeof(prog));
1665				continue;
1666			}
1667			for (i = 0; i < NAME_MAX; i++) {
1668				if (!isprint(p[i]) || isspace(p[i]))
1669					break;
1670				prog[i] = p[i];
1671			}
1672			prog[i] = 0;
1673			continue;
1674		}
1675		for (p = cline + 1; *p != '\0'; p++) {
1676			if (*p != '#')
1677				continue;
1678			if (*(p - 1) == '\\') {
1679				strcpy(p - 1, p);
1680				p--;
1681				continue;
1682			}
1683			*p = '\0';
1684			break;
1685		}
1686		for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1687			cline[i] = '\0';
1688		f = (struct filed *)calloc(1, sizeof(*f));
1689		if (f == NULL) {
1690			logerror("calloc");
1691			exit(1);
1692		}
1693		*nextp = f;
1694		nextp = &f->f_next;
1695		cfline(cline, f, prog, host);
1696	}
1697
1698	/* close the configuration file */
1699	(void)fclose(cf);
1700
1701	Initialized = 1;
1702
1703	if (Debug) {
1704		int port;
1705		for (f = Files; f; f = f->f_next) {
1706			for (i = 0; i <= LOG_NFACILITIES; i++)
1707				if (f->f_pmask[i] == INTERNAL_NOPRI)
1708					printf("X ");
1709				else
1710					printf("%d ", f->f_pmask[i]);
1711			printf("%s: ", TypeNames[f->f_type]);
1712			switch (f->f_type) {
1713			case F_FILE:
1714				printf("%s", f->f_un.f_fname);
1715				break;
1716
1717			case F_CONSOLE:
1718			case F_TTY:
1719				printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1720				break;
1721
1722			case F_FORW:
1723				port = (int)ntohs(((struct sockaddr_in *)
1724				    (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1725				if (port != 514) {
1726					printf("%s:%d",
1727						f->f_un.f_forw.f_hname, port);
1728				} else {
1729					printf("%s", f->f_un.f_forw.f_hname);
1730				}
1731				break;
1732
1733			case F_PIPE:
1734				printf("%s", f->f_un.f_pipe.f_pname);
1735				break;
1736
1737			case F_USERS:
1738				for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1739					printf("%s, ", f->f_un.f_uname[i]);
1740				break;
1741			}
1742			if (f->f_program)
1743				printf(" (%s)", f->f_program);
1744			printf("\n");
1745		}
1746	}
1747
1748	logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1749	dprintf("syslogd: restarted\n");
1750	/*
1751	 * Log a change in hostname, but only on a restart.
1752	 */
1753	if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1754		(void)snprintf(hostMsg, sizeof(hostMsg),
1755		    "syslogd: hostname changed, \"%s\" to \"%s\"",
1756		    oldLocalHostName, LocalHostName);
1757		logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1758		dprintf("%s\n", hostMsg);
1759	}
1760	/*
1761	 * Log the kernel boot file if we aren't going to use it as
1762	 * the prefix, and if this is *not* a restart.
1763	 */
1764	if (signo == 0 && !use_bootfile) {
1765		(void)snprintf(bootfileMsg, sizeof(bootfileMsg),
1766		    "syslogd: kernel boot file is %s", bootfile);
1767		logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1768		dprintf("%s\n", bootfileMsg);
1769	}
1770}
1771
1772/*
1773 * Crack a configuration file line
1774 */
1775static void
1776cfline(const char *line, struct filed *f, const char *prog, const char *host)
1777{
1778	struct addrinfo hints, *res;
1779	int error, i, pri, syncfile;
1780	const char *p, *q;
1781	char *bp;
1782	char buf[MAXLINE], ebuf[100];
1783
1784	dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1785
1786	errno = 0;	/* keep strerror() stuff out of logerror messages */
1787
1788	/* clear out file entry */
1789	memset(f, 0, sizeof(*f));
1790	for (i = 0; i <= LOG_NFACILITIES; i++)
1791		f->f_pmask[i] = INTERNAL_NOPRI;
1792
1793	/* save hostname if any */
1794	if (host && *host == '*')
1795		host = NULL;
1796	if (host) {
1797		int hl;
1798
1799		f->f_host = strdup(host);
1800		if (f->f_host == NULL) {
1801			logerror("strdup");
1802			exit(1);
1803		}
1804		hl = strlen(f->f_host);
1805		if (hl > 0 && f->f_host[hl-1] == '.')
1806			f->f_host[--hl] = '\0';
1807		trimdomain(f->f_host, hl);
1808	}
1809
1810	/* save program name if any */
1811	if (prog && *prog == '*')
1812		prog = NULL;
1813	if (prog) {
1814		f->f_program = strdup(prog);
1815		if (f->f_program == NULL) {
1816			logerror("strdup");
1817			exit(1);
1818		}
1819	}
1820
1821	/* scan through the list of selectors */
1822	for (p = line; *p && *p != '\t' && *p != ' ';) {
1823		int pri_done;
1824		int pri_cmp;
1825		int pri_invert;
1826
1827		/* find the end of this facility name list */
1828		for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1829			continue;
1830
1831		/* get the priority comparison */
1832		pri_cmp = 0;
1833		pri_done = 0;
1834		pri_invert = 0;
1835		if (*q == '!') {
1836			pri_invert = 1;
1837			q++;
1838		}
1839		while (!pri_done) {
1840			switch (*q) {
1841			case '<':
1842				pri_cmp |= PRI_LT;
1843				q++;
1844				break;
1845			case '=':
1846				pri_cmp |= PRI_EQ;
1847				q++;
1848				break;
1849			case '>':
1850				pri_cmp |= PRI_GT;
1851				q++;
1852				break;
1853			default:
1854				pri_done++;
1855				break;
1856			}
1857		}
1858
1859		/* collect priority name */
1860		for (bp = buf; *q && !strchr("\t,; ", *q); )
1861			*bp++ = *q++;
1862		*bp = '\0';
1863
1864		/* skip cruft */
1865		while (strchr(",;", *q))
1866			q++;
1867
1868		/* decode priority name */
1869		if (*buf == '*') {
1870			pri = LOG_PRIMASK;
1871			pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1872		} else {
1873			/* Ignore trailing spaces. */
1874			for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
1875				buf[i] = '\0';
1876
1877			pri = decode(buf, prioritynames);
1878			if (pri < 0) {
1879				(void)snprintf(ebuf, sizeof ebuf,
1880				    "unknown priority name \"%s\"", buf);
1881				logerror(ebuf);
1882				return;
1883			}
1884		}
1885		if (!pri_cmp)
1886			pri_cmp = (UniquePriority)
1887				  ? (PRI_EQ)
1888				  : (PRI_EQ | PRI_GT)
1889				  ;
1890		if (pri_invert)
1891			pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
1892
1893		/* scan facilities */
1894		while (*p && !strchr("\t.; ", *p)) {
1895			for (bp = buf; *p && !strchr("\t,;. ", *p); )
1896				*bp++ = *p++;
1897			*bp = '\0';
1898
1899			if (*buf == '*') {
1900				for (i = 0; i < LOG_NFACILITIES; i++) {
1901					f->f_pmask[i] = pri;
1902					f->f_pcmp[i] = pri_cmp;
1903				}
1904			} else {
1905				i = decode(buf, facilitynames);
1906				if (i < 0) {
1907					(void)snprintf(ebuf, sizeof ebuf,
1908					    "unknown facility name \"%s\"",
1909					    buf);
1910					logerror(ebuf);
1911					return;
1912				}
1913				f->f_pmask[i >> 3] = pri;
1914				f->f_pcmp[i >> 3] = pri_cmp;
1915			}
1916			while (*p == ',' || *p == ' ')
1917				p++;
1918		}
1919
1920		p = q;
1921	}
1922
1923	/* skip to action part */
1924	while (*p == '\t' || *p == ' ')
1925		p++;
1926
1927	if (*p == '-') {
1928		syncfile = 0;
1929		p++;
1930	} else
1931		syncfile = 1;
1932
1933	switch (*p) {
1934	case '@':
1935		{
1936			char *tp;
1937			/*
1938			 * scan forward to see if there is a port defined.
1939			 * so we can't use strlcpy..
1940			 */
1941			i = sizeof(f->f_un.f_forw.f_hname);
1942			tp = f->f_un.f_forw.f_hname;
1943			p++;
1944
1945			while (*p && (*p != ':') && (i-- > 0)) {
1946				*tp++ = *p++;
1947			}
1948			*tp = '\0';
1949		}
1950		/* See if we copied a domain and have a port */
1951		if (*p == ':')
1952			p++;
1953		else
1954			p = NULL;
1955
1956		memset(&hints, 0, sizeof(hints));
1957		hints.ai_family = family;
1958		hints.ai_socktype = SOCK_DGRAM;
1959		error = getaddrinfo(f->f_un.f_forw.f_hname,
1960				p ? p : "syslog", &hints, &res);
1961		if (error) {
1962			logerror(gai_strerror(error));
1963			break;
1964		}
1965		f->f_un.f_forw.f_addr = res;
1966		f->f_type = F_FORW;
1967		break;
1968
1969	case '/':
1970		if ((f->f_file = open(p, logflags, 0600)) < 0) {
1971			f->f_type = F_UNUSED;
1972			logerror(p);
1973			break;
1974		}
1975		if (syncfile)
1976			f->f_flags |= FFLAG_SYNC;
1977		if (isatty(f->f_file)) {
1978			if (strcmp(p, ctty) == 0)
1979				f->f_type = F_CONSOLE;
1980			else
1981				f->f_type = F_TTY;
1982			(void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
1983			    sizeof(f->f_un.f_fname));
1984		} else {
1985			(void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
1986			f->f_type = F_FILE;
1987		}
1988		break;
1989
1990	case '|':
1991		f->f_un.f_pipe.f_pid = 0;
1992		(void)strlcpy(f->f_un.f_pipe.f_pname, p + 1,
1993		    sizeof(f->f_un.f_pipe.f_pname));
1994		f->f_type = F_PIPE;
1995		break;
1996
1997	case '*':
1998		f->f_type = F_WALL;
1999		break;
2000
2001	default:
2002		for (i = 0; i < MAXUNAMES && *p; i++) {
2003			for (q = p; *q && *q != ','; )
2004				q++;
2005			(void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
2006			if ((q - p) > UT_NAMESIZE)
2007				f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
2008			else
2009				f->f_un.f_uname[i][q - p] = '\0';
2010			while (*q == ',' || *q == ' ')
2011				q++;
2012			p = q;
2013		}
2014		f->f_type = F_USERS;
2015		break;
2016	}
2017}
2018
2019
2020/*
2021 *  Decode a symbolic name to a numeric value
2022 */
2023static int
2024decode(const char *name, CODE *codetab)
2025{
2026	CODE *c;
2027	char *p, buf[40];
2028
2029	if (isdigit(*name))
2030		return (atoi(name));
2031
2032	for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2033		if (isupper(*name))
2034			*p = tolower(*name);
2035		else
2036			*p = *name;
2037	}
2038	*p = '\0';
2039	for (c = codetab; c->c_name; c++)
2040		if (!strcmp(buf, c->c_name))
2041			return (c->c_val);
2042
2043	return (-1);
2044}
2045
2046static void
2047markit(void)
2048{
2049	struct filed *f;
2050	dq_t q, next;
2051
2052	now = time((time_t *)NULL);
2053	MarkSeq += TIMERINTVL;
2054	if (MarkSeq >= MarkInterval) {
2055		logmsg(LOG_INFO, "-- MARK --",
2056		    LocalHostName, ADDDATE|MARK);
2057		MarkSeq = 0;
2058	}
2059
2060	for (f = Files; f; f = f->f_next) {
2061		if (f->f_prevcount && now >= REPEATTIME(f)) {
2062			dprintf("flush %s: repeated %d times, %d sec.\n",
2063			    TypeNames[f->f_type], f->f_prevcount,
2064			    repeatinterval[f->f_repeatcount]);
2065			fprintlog(f, 0, (char *)NULL);
2066			BACKOFF(f);
2067		}
2068	}
2069
2070	/* Walk the dead queue, and see if we should signal somebody. */
2071	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2072		next = TAILQ_NEXT(q, dq_entries);
2073
2074		switch (q->dq_timeout) {
2075		case 0:
2076			/* Already signalled once, try harder now. */
2077			if (kill(q->dq_pid, SIGKILL) != 0)
2078				(void)deadq_remove(q->dq_pid);
2079			break;
2080
2081		case 1:
2082			/*
2083			 * Timed out on dead queue, send terminate
2084			 * signal.  Note that we leave the removal
2085			 * from the dead queue to reapchild(), which
2086			 * will also log the event (unless the process
2087			 * didn't even really exist, in case we simply
2088			 * drop it from the dead queue).
2089			 */
2090			if (kill(q->dq_pid, SIGTERM) != 0)
2091				(void)deadq_remove(q->dq_pid);
2092			/* FALLTHROUGH */
2093
2094		default:
2095			q->dq_timeout--;
2096		}
2097	}
2098	MarkSet = 0;
2099	(void)alarm(TIMERINTVL);
2100}
2101
2102/*
2103 * fork off and become a daemon, but wait for the child to come online
2104 * before returing to the parent, or we get disk thrashing at boot etc.
2105 * Set a timer so we don't hang forever if it wedges.
2106 */
2107static int
2108waitdaemon(int nochdir, int noclose, int maxwait)
2109{
2110	int fd;
2111	int status;
2112	pid_t pid, childpid;
2113
2114	switch (childpid = fork()) {
2115	case -1:
2116		return (-1);
2117	case 0:
2118		break;
2119	default:
2120		signal(SIGALRM, timedout);
2121		alarm(maxwait);
2122		while ((pid = wait3(&status, 0, NULL)) != -1) {
2123			if (WIFEXITED(status))
2124				errx(1, "child pid %d exited with return code %d",
2125					pid, WEXITSTATUS(status));
2126			if (WIFSIGNALED(status))
2127				errx(1, "child pid %d exited on signal %d%s",
2128					pid, WTERMSIG(status),
2129					WCOREDUMP(status) ? " (core dumped)" :
2130					"");
2131			if (pid == childpid)	/* it's gone... */
2132				break;
2133		}
2134		exit(0);
2135	}
2136
2137	if (setsid() == -1)
2138		return (-1);
2139
2140	if (!nochdir)
2141		(void)chdir("/");
2142
2143	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2144		(void)dup2(fd, STDIN_FILENO);
2145		(void)dup2(fd, STDOUT_FILENO);
2146		(void)dup2(fd, STDERR_FILENO);
2147		if (fd > 2)
2148			(void)close (fd);
2149	}
2150	return (getppid());
2151}
2152
2153/*
2154 * We get a SIGALRM from the child when it's running and finished doing it's
2155 * fsync()'s or O_SYNC writes for all the boot messages.
2156 *
2157 * We also get a signal from the kernel if the timer expires, so check to
2158 * see what happened.
2159 */
2160static void
2161timedout(int sig __unused)
2162{
2163	int left;
2164	left = alarm(0);
2165	signal(SIGALRM, SIG_DFL);
2166	if (left == 0)
2167		errx(1, "timed out waiting for child");
2168	else
2169		_exit(0);
2170}
2171
2172/*
2173 * Add `s' to the list of allowable peer addresses to accept messages
2174 * from.
2175 *
2176 * `s' is a string in the form:
2177 *
2178 *    [*]domainname[:{servicename|portnumber|*}]
2179 *
2180 * or
2181 *
2182 *    netaddr/maskbits[:{servicename|portnumber|*}]
2183 *
2184 * Returns -1 on error, 0 if the argument was valid.
2185 */
2186static int
2187allowaddr(char *s)
2188{
2189	char *cp1, *cp2;
2190	struct allowedpeer ap;
2191	struct servent *se;
2192	int masklen = -1;
2193	struct addrinfo hints, *res;
2194	struct in_addr *addrp, *maskp;
2195#ifdef INET6
2196	int i;
2197	u_int32_t *addr6p, *mask6p;
2198#endif
2199	char ip[NI_MAXHOST];
2200
2201#ifdef INET6
2202	if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2203#endif
2204		cp1 = s;
2205	if ((cp1 = strrchr(cp1, ':'))) {
2206		/* service/port provided */
2207		*cp1++ = '\0';
2208		if (strlen(cp1) == 1 && *cp1 == '*')
2209			/* any port allowed */
2210			ap.port = 0;
2211		else if ((se = getservbyname(cp1, "udp"))) {
2212			ap.port = ntohs(se->s_port);
2213		} else {
2214			ap.port = strtol(cp1, &cp2, 0);
2215			if (*cp2 != '\0')
2216				return (-1); /* port not numeric */
2217		}
2218	} else {
2219		if ((se = getservbyname("syslog", "udp")))
2220			ap.port = ntohs(se->s_port);
2221		else
2222			/* sanity, should not happen */
2223			ap.port = 514;
2224	}
2225
2226	if ((cp1 = strchr(s, '/')) != NULL &&
2227	    strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2228		*cp1 = '\0';
2229		if ((masklen = atoi(cp1 + 1)) < 0)
2230			return (-1);
2231	}
2232#ifdef INET6
2233	if (*s == '[') {
2234		cp2 = s + strlen(s) - 1;
2235		if (*cp2 == ']') {
2236			++s;
2237			*cp2 = '\0';
2238		} else {
2239			cp2 = NULL;
2240		}
2241	} else {
2242		cp2 = NULL;
2243	}
2244#endif
2245	memset(&hints, 0, sizeof(hints));
2246	hints.ai_family = PF_UNSPEC;
2247	hints.ai_socktype = SOCK_DGRAM;
2248	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2249	if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2250		ap.isnumeric = 1;
2251		memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2252		memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2253		ap.a_mask.ss_family = res->ai_family;
2254		if (res->ai_family == AF_INET) {
2255			ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2256			maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2257			addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2258			if (masklen < 0) {
2259				/* use default netmask */
2260				if (IN_CLASSA(ntohl(addrp->s_addr)))
2261					maskp->s_addr = htonl(IN_CLASSA_NET);
2262				else if (IN_CLASSB(ntohl(addrp->s_addr)))
2263					maskp->s_addr = htonl(IN_CLASSB_NET);
2264				else
2265					maskp->s_addr = htonl(IN_CLASSC_NET);
2266			} else if (masklen <= 32) {
2267				/* convert masklen to netmask */
2268				if (masklen == 0)
2269					maskp->s_addr = 0;
2270				else
2271					maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2272			} else {
2273				freeaddrinfo(res);
2274				return (-1);
2275			}
2276			/* Lose any host bits in the network number. */
2277			addrp->s_addr &= maskp->s_addr;
2278		}
2279#ifdef INET6
2280		else if (res->ai_family == AF_INET6 && masklen <= 128) {
2281			ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2282			if (masklen < 0)
2283				masklen = 128;
2284			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2285			/* convert masklen to netmask */
2286			while (masklen > 0) {
2287				if (masklen < 32) {
2288					*mask6p = htonl(~(0xffffffff >> masklen));
2289					break;
2290				}
2291				*mask6p++ = 0xffffffff;
2292				masklen -= 32;
2293			}
2294			/* Lose any host bits in the network number. */
2295			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2296			addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2297			for (i = 0; i < 4; i++)
2298				addr6p[i] &= mask6p[i];
2299		}
2300#endif
2301		else {
2302			freeaddrinfo(res);
2303			return (-1);
2304		}
2305		freeaddrinfo(res);
2306	} else {
2307		/* arg `s' is domain name */
2308		ap.isnumeric = 0;
2309		ap.a_name = s;
2310		if (cp1)
2311			*cp1 = '/';
2312#ifdef INET6
2313		if (cp2) {
2314			*cp2 = ']';
2315			--s;
2316		}
2317#endif
2318	}
2319
2320	if (Debug) {
2321		printf("allowaddr: rule %d: ", NumAllowed);
2322		if (ap.isnumeric) {
2323			printf("numeric, ");
2324			getnameinfo((struct sockaddr *)&ap.a_addr,
2325				    ((struct sockaddr *)&ap.a_addr)->sa_len,
2326				    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2327			printf("addr = %s, ", ip);
2328			getnameinfo((struct sockaddr *)&ap.a_mask,
2329				    ((struct sockaddr *)&ap.a_mask)->sa_len,
2330				    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2331			printf("mask = %s; ", ip);
2332		} else {
2333			printf("domainname = %s; ", ap.a_name);
2334		}
2335		printf("port = %d\n", ap.port);
2336	}
2337
2338	if ((AllowedPeers = realloc(AllowedPeers,
2339				    ++NumAllowed * sizeof(struct allowedpeer)))
2340	    == NULL) {
2341		logerror("realloc");
2342		exit(1);
2343	}
2344	memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2345	return (0);
2346}
2347
2348/*
2349 * Validate that the remote peer has permission to log to us.
2350 */
2351static int
2352validate(struct sockaddr *sa, const char *hname)
2353{
2354	int i;
2355	size_t l1, l2;
2356	char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2357	struct allowedpeer *ap;
2358	struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2359#ifdef INET6
2360	int j, reject;
2361	struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2362#endif
2363	struct addrinfo hints, *res;
2364	u_short sport;
2365
2366	if (NumAllowed == 0)
2367		/* traditional behaviour, allow everything */
2368		return (1);
2369
2370	(void)strlcpy(name, hname, sizeof(name));
2371	memset(&hints, 0, sizeof(hints));
2372	hints.ai_family = PF_UNSPEC;
2373	hints.ai_socktype = SOCK_DGRAM;
2374	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2375	if (getaddrinfo(name, NULL, &hints, &res) == 0)
2376		freeaddrinfo(res);
2377	else if (strchr(name, '.') == NULL) {
2378		strlcat(name, ".", sizeof name);
2379		strlcat(name, LocalDomain, sizeof name);
2380	}
2381	if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2382			NI_NUMERICHOST | NI_NUMERICSERV) != 0)
2383		return (0);	/* for safety, should not occur */
2384	dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2385		ip, port, name);
2386	sport = atoi(port);
2387
2388	/* now, walk down the list */
2389	for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2390		if (ap->port != 0 && ap->port != sport) {
2391			dprintf("rejected in rule %d due to port mismatch.\n", i);
2392			continue;
2393		}
2394
2395		if (ap->isnumeric) {
2396			if (ap->a_addr.ss_family != sa->sa_family) {
2397				dprintf("rejected in rule %d due to address family mismatch.\n", i);
2398				continue;
2399			}
2400			if (ap->a_addr.ss_family == AF_INET) {
2401				sin4 = (struct sockaddr_in *)sa;
2402				a4p = (struct sockaddr_in *)&ap->a_addr;
2403				m4p = (struct sockaddr_in *)&ap->a_mask;
2404				if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2405				    != a4p->sin_addr.s_addr) {
2406					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2407					continue;
2408				}
2409			}
2410#ifdef INET6
2411			else if (ap->a_addr.ss_family == AF_INET6) {
2412				sin6 = (struct sockaddr_in6 *)sa;
2413				a6p = (struct sockaddr_in6 *)&ap->a_addr;
2414				m6p = (struct sockaddr_in6 *)&ap->a_mask;
2415				if (a6p->sin6_scope_id != 0 &&
2416				    sin6->sin6_scope_id != a6p->sin6_scope_id) {
2417					dprintf("rejected in rule %d due to scope mismatch.\n", i);
2418					continue;
2419				}
2420				reject = 0;
2421				for (j = 0; j < 16; j += 4) {
2422					if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2423					    != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2424						++reject;
2425						break;
2426					}
2427				}
2428				if (reject) {
2429					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2430					continue;
2431				}
2432			}
2433#endif
2434			else
2435				continue;
2436		} else {
2437			cp = ap->a_name;
2438			l1 = strlen(name);
2439			if (*cp == '*') {
2440				/* allow wildmatch */
2441				cp++;
2442				l2 = strlen(cp);
2443				if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2444					dprintf("rejected in rule %d due to name mismatch.\n", i);
2445					continue;
2446				}
2447			} else {
2448				/* exact match */
2449				l2 = strlen(cp);
2450				if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2451					dprintf("rejected in rule %d due to name mismatch.\n", i);
2452					continue;
2453				}
2454			}
2455		}
2456		dprintf("accepted in rule %d.\n", i);
2457		return (1);	/* hooray! */
2458	}
2459	return (0);
2460}
2461
2462/*
2463 * Fairly similar to popen(3), but returns an open descriptor, as
2464 * opposed to a FILE *.
2465 */
2466static int
2467p_open(const char *prog, pid_t *rpid)
2468{
2469	int pfd[2], nulldesc, i;
2470	pid_t pid;
2471	sigset_t omask, mask;
2472	char *argv[4]; /* sh -c cmd NULL */
2473	char errmsg[200];
2474
2475	if (pipe(pfd) == -1)
2476		return (-1);
2477	if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2478		/* we are royally screwed anyway */
2479		return (-1);
2480
2481	sigemptyset(&mask);
2482	sigaddset(&mask, SIGALRM);
2483	sigaddset(&mask, SIGHUP);
2484	sigprocmask(SIG_BLOCK, &mask, &omask);
2485	switch ((pid = fork())) {
2486	case -1:
2487		sigprocmask(SIG_SETMASK, &omask, 0);
2488		close(nulldesc);
2489		return (-1);
2490
2491	case 0:
2492		argv[0] = strdup("sh");
2493		argv[1] = strdup("-c");
2494		argv[2] = strdup(prog);
2495		argv[3] = NULL;
2496		if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2497			logerror("strdup");
2498			exit(1);
2499		}
2500
2501		alarm(0);
2502		(void)setsid();	/* Avoid catching SIGHUPs. */
2503
2504		/*
2505		 * Throw away pending signals, and reset signal
2506		 * behaviour to standard values.
2507		 */
2508		signal(SIGALRM, SIG_IGN);
2509		signal(SIGHUP, SIG_IGN);
2510		sigprocmask(SIG_SETMASK, &omask, 0);
2511		signal(SIGPIPE, SIG_DFL);
2512		signal(SIGQUIT, SIG_DFL);
2513		signal(SIGALRM, SIG_DFL);
2514		signal(SIGHUP, SIG_DFL);
2515
2516		dup2(pfd[0], STDIN_FILENO);
2517		dup2(nulldesc, STDOUT_FILENO);
2518		dup2(nulldesc, STDERR_FILENO);
2519		for (i = getdtablesize(); i > 2; i--)
2520			(void)close(i);
2521
2522		(void)execvp(_PATH_BSHELL, argv);
2523		_exit(255);
2524	}
2525
2526	sigprocmask(SIG_SETMASK, &omask, 0);
2527	close(nulldesc);
2528	close(pfd[0]);
2529	/*
2530	 * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
2531	 * supposed to get an EWOULDBLOCK on writev(2), which is
2532	 * caught by the logic above anyway, which will in turn close
2533	 * the pipe, and fork a new logging subprocess if necessary.
2534	 * The stale subprocess will be killed some time later unless
2535	 * it terminated itself due to closing its input pipe (so we
2536	 * get rid of really dead puppies).
2537	 */
2538	if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2539		/* This is bad. */
2540		(void)snprintf(errmsg, sizeof errmsg,
2541			       "Warning: cannot change pipe to PID %d to "
2542			       "non-blocking behaviour.",
2543			       (int)pid);
2544		logerror(errmsg);
2545	}
2546	*rpid = pid;
2547	return (pfd[1]);
2548}
2549
2550static void
2551deadq_enter(pid_t pid, const char *name)
2552{
2553	dq_t p;
2554	int status;
2555
2556	/*
2557	 * Be paranoid, if we can't signal the process, don't enter it
2558	 * into the dead queue (perhaps it's already dead).  If possible,
2559	 * we try to fetch and log the child's status.
2560	 */
2561	if (kill(pid, 0) != 0) {
2562		if (waitpid(pid, &status, WNOHANG) > 0)
2563			log_deadchild(pid, status, name);
2564		return;
2565	}
2566
2567	p = malloc(sizeof(struct deadq_entry));
2568	if (p == NULL) {
2569		logerror("malloc");
2570		exit(1);
2571	}
2572
2573	p->dq_pid = pid;
2574	p->dq_timeout = DQ_TIMO_INIT;
2575	TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2576}
2577
2578static int
2579deadq_remove(pid_t pid)
2580{
2581	dq_t q;
2582
2583	TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2584		if (q->dq_pid == pid) {
2585			TAILQ_REMOVE(&deadq_head, q, dq_entries);
2586				free(q);
2587				return (1);
2588		}
2589	}
2590
2591	return (0);
2592}
2593
2594static void
2595log_deadchild(pid_t pid, int status, const char *name)
2596{
2597	int code;
2598	char buf[256];
2599	const char *reason;
2600
2601	errno = 0; /* Keep strerror() stuff out of logerror messages. */
2602	if (WIFSIGNALED(status)) {
2603		reason = "due to signal";
2604		code = WTERMSIG(status);
2605	} else {
2606		reason = "with status";
2607		code = WEXITSTATUS(status);
2608		if (code == 0)
2609			return;
2610	}
2611	(void)snprintf(buf, sizeof buf,
2612		       "Logging subprocess %d (%s) exited %s %d.",
2613		       pid, name, reason, code);
2614	logerror(buf);
2615}
2616
2617static int *
2618socksetup(int af, const char *bindhostname)
2619{
2620	struct addrinfo hints, *res, *r;
2621	int error, maxs, *s, *socks;
2622
2623	memset(&hints, 0, sizeof(hints));
2624	hints.ai_flags = AI_PASSIVE;
2625	hints.ai_family = af;
2626	hints.ai_socktype = SOCK_DGRAM;
2627	error = getaddrinfo(bindhostname, "syslog", &hints, &res);
2628	if (error) {
2629		logerror(gai_strerror(error));
2630		errno = 0;
2631		die(0);
2632	}
2633
2634	/* Count max number of sockets we may open */
2635	for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2636	socks = malloc((maxs+1) * sizeof(int));
2637	if (socks == NULL) {
2638		logerror("couldn't allocate memory for sockets");
2639		die(0);
2640	}
2641
2642	*socks = 0;   /* num of sockets counter at start of array */
2643	s = socks + 1;
2644	for (r = res; r; r = r->ai_next) {
2645		int on = 1;
2646		*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2647		if (*s < 0) {
2648			logerror("socket");
2649			continue;
2650		}
2651		if (r->ai_family == AF_INET6) {
2652			if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2653				       (char *)&on, sizeof (on)) < 0) {
2654				logerror("setsockopt");
2655				close(*s);
2656				continue;
2657			}
2658		}
2659		if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
2660			       (char *)&on, sizeof (on)) < 0) {
2661			logerror("setsockopt");
2662			close(*s);
2663			continue;
2664		}
2665		if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2666			close(*s);
2667			logerror("bind");
2668			continue;
2669		}
2670
2671		double_rbuf(*s);
2672
2673		(*socks)++;
2674		s++;
2675	}
2676
2677	if (*socks == 0) {
2678		free(socks);
2679		if (Debug)
2680			return (NULL);
2681		else
2682			die(0);
2683	}
2684	if (res)
2685		freeaddrinfo(res);
2686
2687	return (socks);
2688}
2689
2690static void
2691double_rbuf(int fd)
2692{
2693	socklen_t slen, len;
2694
2695	if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
2696		len *= 2;
2697		setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen);
2698	}
2699}
2700