syslogd.c revision 186263 
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 186263 2008-12-18 04:03:29Z avatar $");
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/stat.h>
81#include <sys/wait.h>
82#include <sys/socket.h>
83#include <sys/queue.h>
84#include <sys/uio.h>
85#include <sys/un.h>
86#include <sys/time.h>
87#include <sys/resource.h>
88#include <sys/syslimits.h>
89#include <sys/types.h>
90
91#include <netinet/in.h>
92#include <netdb.h>
93#include <arpa/inet.h>
94
95#include <ctype.h>
96#include <err.h>
97#include <errno.h>
98#include <fcntl.h>
99#include <libutil.h>
100#include <limits.h>
101#include <paths.h>
102#include <signal.h>
103#include <stdio.h>
104#include <stdlib.h>
105#include <string.h>
106#include <sysexits.h>
107#include <unistd.h>
108#include <utmp.h>
109
110#include "pathnames.h"
111#include "ttymsg.h"
112
113#define SYSLOG_NAMES
114#include <sys/syslog.h>
115
116const char	*ConfFile = _PATH_LOGCONF;
117const char	*PidFile = _PATH_LOGPID;
118const char	ctty[] = _PATH_CONSOLE;
119
120#define	dprintf		if (Debug) printf
121
122#define	MAXUNAMES	20	/* maximum number of user names */
123
124/*
125 * Unix sockets.
126 * We have two default sockets, one with 666 permissions,
127 * and one for privileged programs.
128 */
129struct funix {
130	int			s;
131	char			*name;
132	mode_t			mode;
133	STAILQ_ENTRY(funix)	next;
134};
135struct funix funix_secure =	{ -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
136				{ NULL } };
137struct funix funix_default =	{ -1, _PATH_LOG, DEFFILEMODE,
138				{ &funix_secure } };
139
140STAILQ_HEAD(, funix) funixes =	{ &funix_default,
141				&(funix_secure.next.stqe_next) };
142
143/*
144 * Flags to logmsg().
145 */
146
147#define	IGN_CONS	0x001	/* don't print on console */
148#define	SYNC_FILE	0x002	/* do fsync on file after printing */
149#define	ADDDATE		0x004	/* add a date to the message */
150#define	MARK		0x008	/* this message is a mark */
151#define	ISKERNEL	0x010	/* kernel generated message */
152
153/*
154 * This structure represents the files that will have log
155 * copies printed.
156 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
157 * or if f_type if F_PIPE and f_pid > 0.
158 */
159
160struct filed {
161	struct	filed *f_next;		/* next in linked list */
162	short	f_type;			/* entry type, see below */
163	short	f_file;			/* file descriptor */
164	time_t	f_time;			/* time this was last written */
165	char	*f_host;		/* host from which to recd. */
166	u_char	f_pmask[LOG_NFACILITIES+1];	/* priority mask */
167	u_char	f_pcmp[LOG_NFACILITIES+1];	/* compare priority */
168#define PRI_LT	0x1
169#define PRI_EQ	0x2
170#define PRI_GT	0x4
171	char	*f_program;		/* program this applies to */
172	union {
173		char	f_uname[MAXUNAMES][UT_NAMESIZE+1];
174		struct {
175			char	f_hname[MAXHOSTNAMELEN];
176			struct addrinfo *f_addr;
177
178		} f_forw;		/* forwarding address */
179		char	f_fname[MAXPATHLEN];
180		struct {
181			char	f_pname[MAXPATHLEN];
182			pid_t	f_pid;
183		} f_pipe;
184	} f_un;
185	char	f_prevline[MAXSVLINE];		/* last message logged */
186	char	f_lasttime[16];			/* time of last occurrence */
187	char	f_prevhost[MAXHOSTNAMELEN];	/* host from which recd. */
188	int	f_prevpri;			/* pri of f_prevline */
189	int	f_prevlen;			/* length of f_prevline */
190	int	f_prevcount;			/* repetition cnt of prevline */
191	u_int	f_repeatcount;			/* number of "repeated" msgs */
192	int	f_flags;			/* file-specific flags */
193#define	FFLAG_SYNC 0x01
194#define	FFLAG_NEEDSYNC	0x02
195};
196
197/*
198 * Queue of about-to-be dead processes we should watch out for.
199 */
200
201TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
202struct stailhead *deadq_headp;
203
204struct deadq_entry {
205	pid_t				dq_pid;
206	int				dq_timeout;
207	TAILQ_ENTRY(deadq_entry)	dq_entries;
208};
209
210/*
211 * The timeout to apply to processes waiting on the dead queue.  Unit
212 * of measure is `mark intervals', i.e. 20 minutes by default.
213 * Processes on the dead queue will be terminated after that time.
214 */
215
216#define	 DQ_TIMO_INIT	2
217
218typedef struct deadq_entry *dq_t;
219
220
221/*
222 * Struct to hold records of network addresses that are allowed to log
223 * to us.
224 */
225struct allowedpeer {
226	int isnumeric;
227	u_short port;
228	union {
229		struct {
230			struct sockaddr_storage addr;
231			struct sockaddr_storage mask;
232		} numeric;
233		char *name;
234	} u;
235#define a_addr u.numeric.addr
236#define a_mask u.numeric.mask
237#define a_name u.name
238};
239
240
241/*
242 * Intervals at which we flush out "message repeated" messages,
243 * in seconds after previous message is logged.  After each flush,
244 * we move to the next interval until we reach the largest.
245 */
246int	repeatinterval[] = { 30, 120, 600 };	/* # of secs before flush */
247#define	MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
248#define	REPEATTIME(f)	((f)->f_time + repeatinterval[(f)->f_repeatcount])
249#define	BACKOFF(f)	{ if (++(f)->f_repeatcount > MAXREPEAT) \
250				 (f)->f_repeatcount = MAXREPEAT; \
251			}
252
253/* values for f_type */
254#define F_UNUSED	0		/* unused entry */
255#define F_FILE		1		/* regular file */
256#define F_TTY		2		/* terminal */
257#define F_CONSOLE	3		/* console terminal */
258#define F_FORW		4		/* remote machine */
259#define F_USERS		5		/* list of users */
260#define F_WALL		6		/* everyone logged on */
261#define F_PIPE		7		/* pipe to program */
262
263const char *TypeNames[8] = {
264	"UNUSED",	"FILE",		"TTY",		"CONSOLE",
265	"FORW",		"USERS",	"WALL",		"PIPE"
266};
267
268static struct filed *Files;	/* Log files that we write to */
269static struct filed consfile;	/* Console */
270
271static int	Debug;		/* debug flag */
272static int	resolve = 1;	/* resolve hostname */
273static char	LocalHostName[MAXHOSTNAMELEN];	/* our hostname */
274static const char *LocalDomain;	/* our local domain name */
275static int	*finet;		/* Internet datagram socket */
276static int	fklog = -1;	/* /dev/klog */
277static int	Initialized;	/* set when we have initialized ourselves */
278static int	MarkInterval = 20 * 60;	/* interval between marks in seconds */
279static int	MarkSeq;	/* mark sequence number */
280static int	SecureMode;	/* when true, receive only unix domain socks */
281#ifdef INET6
282static int	family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
283#else
284static int	family = PF_INET; /* protocol family (IPv4 only) */
285#endif
286static int	mask_C1 = 1;	/* mask characters from 0x80 - 0x9F */
287static int	send_to_all;	/* send message to all IPv4/IPv6 addresses */
288static int	use_bootfile;	/* log entire bootfile for every kern msg */
289static int	no_compress;	/* don't compress messages (1=pipes, 2=all) */
290static int	logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
291
292static char	bootfile[MAXLINE+1]; /* booted kernel file */
293
294struct allowedpeer *AllowedPeers; /* List of allowed peers */
295static int	NumAllowed;	/* Number of entries in AllowedPeers */
296static int	RemoteAddDate;	/* Always set the date on remote messages */
297
298static int	UniquePriority;	/* Only log specified priority? */
299static int	LogFacPri;	/* Put facility and priority in log message: */
300				/* 0=no, 1=numeric, 2=names */
301static int	KeepKernFac;	/* Keep remotely logged kernel facility */
302static int	needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
303static struct pidfh *pfh;
304
305volatile sig_atomic_t MarkSet, WantDie;
306
307static int	allowaddr(char *);
308static void	cfline(const char *, struct filed *,
309		    const char *, const char *);
310static const char *cvthname(struct sockaddr *);
311static void	deadq_enter(pid_t, const char *);
312static int	deadq_remove(pid_t);
313static int	decode(const char *, CODE *);
314static void	die(int);
315static void	dodie(int);
316static void	dofsync(void);
317static void	domark(int);
318static void	fprintlog(struct filed *, int, const char *);
319static int	*socksetup(int, const char *);
320static void	init(int);
321static void	logerror(const char *);
322static void	logmsg(int, const char *, const char *, int);
323static void	log_deadchild(pid_t, int, const char *);
324static void	markit(void);
325static int	skip_message(const char *, const char *, int);
326static void	printline(const char *, char *, int);
327static void	printsys(char *);
328static int	p_open(const char *, pid_t *);
329static void	readklog(void);
330static void	reapchild(int);
331static void	usage(void);
332static int	validate(struct sockaddr *, const char *);
333static void	unmapped(struct sockaddr *);
334static void	wallmsg(struct filed *, struct iovec *, const int iovlen);
335static int	waitdaemon(int, int, int);
336static void	timedout(int);
337static void	double_rbuf(int);
338
339int
340main(int argc, char *argv[])
341{
342	int ch, i, fdsrmax = 0, l;
343	struct sockaddr_un sunx, fromunix;
344	struct sockaddr_storage frominet;
345	fd_set *fdsr = NULL;
346	char line[MAXLINE + 1];
347	const char *bindhostname, *hname;
348	struct timeval tv, *tvp;
349	struct sigaction sact;
350	struct funix *fx, *fx1;
351	sigset_t mask;
352	pid_t ppid = 1, spid;
353	socklen_t len;
354
355	bindhostname = NULL;
356	while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nop:P:sS:Tuv"))
357	    != -1)
358		switch (ch) {
359		case '4':
360			family = PF_INET;
361			break;
362#ifdef INET6
363		case '6':
364			family = PF_INET6;
365			break;
366#endif
367		case '8':
368			mask_C1 = 0;
369			break;
370		case 'A':
371			send_to_all++;
372			break;
373		case 'a':		/* allow specific network addresses only */
374			if (allowaddr(optarg) == -1)
375				usage();
376			break;
377		case 'b':
378			bindhostname = optarg;
379			break;
380		case 'c':
381			no_compress++;
382			break;
383		case 'C':
384			logflags |= O_CREAT;
385			break;
386		case 'd':		/* debug */
387			Debug++;
388			break;
389		case 'f':		/* configuration file */
390			ConfFile = optarg;
391			break;
392		case 'k':		/* keep remote kern fac */
393			KeepKernFac = 1;
394			break;
395		case 'l':
396		    {
397			long	perml;
398			mode_t	mode;
399			char	*name, *ep;
400
401			if (optarg[0] == '/') {
402				mode = DEFFILEMODE;
403				name = optarg;
404			} else if ((name = strchr(optarg, ':')) != NULL) {
405				*name++ = '\0';
406				if (name[0] != '/')
407					errx(1, "socket name must be absolute "
408					    "path");
409				if (isdigit(*optarg)) {
410					perml = strtol(optarg, &ep, 8);
411				    if (*ep || perml < 0 ||
412					perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
413					    errx(1, "invalid mode %s, exiting",
414						optarg);
415				    mode = (mode_t )perml;
416				} else
417					errx(1, "invalid mode %s, exiting",
418					    optarg);
419			} else	/* doesn't begin with '/', and no ':' */
420				errx(1, "can't parse path %s", optarg);
421
422			if (strlen(name) >= sizeof(sunx.sun_path))
423				errx(1, "%s path too long, exiting", name);
424			if ((fx = malloc(sizeof(struct funix))) == NULL)
425				errx(1, "malloc failed");
426			fx->s = -1;
427			fx->name = name;
428			fx->mode = mode;
429			STAILQ_INSERT_TAIL(&funixes, fx, next);
430			break;
431		   }
432		case 'm':		/* mark interval */
433			MarkInterval = atoi(optarg) * 60;
434			break;
435		case 'n':
436			resolve = 0;
437			break;
438		case 'o':
439			use_bootfile = 1;
440			break;
441		case 'p':		/* path */
442			if (strlen(optarg) >= sizeof(sunx.sun_path))
443				errx(1, "%s path too long, exiting", optarg);
444			funix_default.name = optarg;
445			break;
446		case 'P':		/* path for alt. PID */
447			PidFile = optarg;
448			break;
449		case 's':		/* no network mode */
450			SecureMode++;
451			break;
452		case 'S':		/* path for privileged originator */
453			if (strlen(optarg) >= sizeof(sunx.sun_path))
454				errx(1, "%s path too long, exiting", optarg);
455			funix_secure.name = optarg;
456			break;
457		case 'T':
458			RemoteAddDate = 1;
459			break;
460		case 'u':		/* only log specified priority */
461			UniquePriority++;
462			break;
463		case 'v':		/* log facility and priority */
464		  	LogFacPri++;
465			break;
466		default:
467			usage();
468		}
469	if ((argc -= optind) != 0)
470		usage();
471
472	pfh = pidfile_open(PidFile, 0600, &spid);
473	if (pfh == NULL) {
474		if (errno == EEXIST)
475			errx(1, "syslogd already running, pid: %d", spid);
476		warn("cannot open pid file");
477	}
478
479	if (!Debug) {
480		ppid = waitdaemon(0, 0, 30);
481		if (ppid < 0) {
482			warn("could not become daemon");
483			pidfile_remove(pfh);
484			exit(1);
485		}
486	} else {
487		setlinebuf(stdout);
488	}
489
490	if (NumAllowed)
491		endservent();
492
493	consfile.f_type = F_CONSOLE;
494	(void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
495	    sizeof(consfile.f_un.f_fname));
496	(void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
497	(void)signal(SIGTERM, dodie);
498	(void)signal(SIGINT, Debug ? dodie : SIG_IGN);
499	(void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
500	/*
501	 * We don't want the SIGCHLD and SIGHUP handlers to interfere
502	 * with each other; they are likely candidates for being called
503	 * simultaneously (SIGHUP closes pipe descriptor, process dies,
504	 * SIGCHLD happens).
505	 */
506	sigemptyset(&mask);
507	sigaddset(&mask, SIGHUP);
508	sact.sa_handler = reapchild;
509	sact.sa_mask = mask;
510	sact.sa_flags = SA_RESTART;
511	(void)sigaction(SIGCHLD, &sact, NULL);
512	(void)signal(SIGALRM, domark);
513	(void)signal(SIGPIPE, SIG_IGN);	/* We'll catch EPIPE instead. */
514	(void)alarm(TIMERINTVL);
515
516	TAILQ_INIT(&deadq_head);
517
518#ifndef SUN_LEN
519#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
520#endif
521	STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) {
522		(void)unlink(fx->name);
523		memset(&sunx, 0, sizeof(sunx));
524		sunx.sun_family = AF_LOCAL;
525		(void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path));
526		fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0);
527		if (fx->s < 0 ||
528		    bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
529		    chmod(fx->name, fx->mode) < 0) {
530			(void)snprintf(line, sizeof line,
531					"cannot create %s", fx->name);
532			logerror(line);
533			dprintf("cannot create %s (%d)\n", fx->name, errno);
534			if (fx == &funix_default || fx == &funix_secure)
535				die(0);
536			else {
537				STAILQ_REMOVE(&funixes, fx, funix, next);
538				continue;
539			}
540			double_rbuf(fx->s);
541		}
542	}
543	if (SecureMode <= 1)
544		finet = socksetup(family, bindhostname);
545
546	if (finet) {
547		if (SecureMode) {
548			for (i = 0; i < *finet; i++) {
549				if (shutdown(finet[i+1], SHUT_RD) < 0) {
550					logerror("shutdown");
551					if (!Debug)
552						die(0);
553				}
554			}
555		} else {
556			dprintf("listening on inet and/or inet6 socket\n");
557		}
558		dprintf("sending on inet and/or inet6 socket\n");
559	}
560
561	if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
562		if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
563			fklog = -1;
564	if (fklog < 0)
565		dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
566
567	/* tuck my process id away */
568	pidfile_write(pfh);
569
570	dprintf("off & running....\n");
571
572	init(0);
573	/* prevent SIGHUP and SIGCHLD handlers from running in parallel */
574	sigemptyset(&mask);
575	sigaddset(&mask, SIGCHLD);
576	sact.sa_handler = init;
577	sact.sa_mask = mask;
578	sact.sa_flags = SA_RESTART;
579	(void)sigaction(SIGHUP, &sact, NULL);
580
581	tvp = &tv;
582	tv.tv_sec = tv.tv_usec = 0;
583
584	if (fklog != -1 && fklog > fdsrmax)
585		fdsrmax = fklog;
586	if (finet && !SecureMode) {
587		for (i = 0; i < *finet; i++) {
588		    if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
589			fdsrmax = finet[i+1];
590		}
591	}
592	STAILQ_FOREACH(fx, &funixes, next)
593		if (fx->s > fdsrmax)
594			fdsrmax = fx->s;
595
596	fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
597	    sizeof(fd_mask));
598	if (fdsr == NULL)
599		errx(1, "calloc fd_set");
600
601	for (;;) {
602		if (MarkSet)
603			markit();
604		if (WantDie)
605			die(WantDie);
606
607		bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
608		    sizeof(fd_mask));
609
610		if (fklog != -1)
611			FD_SET(fklog, fdsr);
612		if (finet && !SecureMode) {
613			for (i = 0; i < *finet; i++) {
614				if (finet[i+1] != -1)
615					FD_SET(finet[i+1], fdsr);
616			}
617		}
618		STAILQ_FOREACH(fx, &funixes, next)
619			FD_SET(fx->s, fdsr);
620
621		i = select(fdsrmax+1, fdsr, NULL, NULL,
622		    needdofsync ? &tv : tvp);
623		switch (i) {
624		case 0:
625			dofsync();
626			needdofsync = 0;
627			if (tvp) {
628				tvp = NULL;
629				if (ppid != 1)
630					kill(ppid, SIGALRM);
631			}
632			continue;
633		case -1:
634			if (errno != EINTR)
635				logerror("select");
636			continue;
637		}
638		if (fklog != -1 && FD_ISSET(fklog, fdsr))
639			readklog();
640		if (finet && !SecureMode) {
641			for (i = 0; i < *finet; i++) {
642				if (FD_ISSET(finet[i+1], fdsr)) {
643					len = sizeof(frominet);
644					l = recvfrom(finet[i+1], line, MAXLINE,
645					     0, (struct sockaddr *)&frominet,
646					     &len);
647					if (l > 0) {
648						line[l] = '\0';
649						hname = cvthname((struct sockaddr *)&frominet);
650						unmapped((struct sockaddr *)&frominet);
651						if (validate((struct sockaddr *)&frominet, hname))
652							printline(hname, line, RemoteAddDate ? ADDDATE : 0);
653					} else if (l < 0 && errno != EINTR)
654						logerror("recvfrom inet");
655				}
656			}
657		}
658		STAILQ_FOREACH(fx, &funixes, next) {
659			if (FD_ISSET(fx->s, fdsr)) {
660				len = sizeof(fromunix);
661				l = recvfrom(fx->s, line, MAXLINE, 0,
662				    (struct sockaddr *)&fromunix, &len);
663				if (l > 0) {
664					line[l] = '\0';
665					printline(LocalHostName, line, 0);
666				} else if (l < 0 && errno != EINTR)
667					logerror("recvfrom unix");
668			}
669		}
670	}
671	if (fdsr)
672		free(fdsr);
673}
674
675static void
676unmapped(struct sockaddr *sa)
677{
678	struct sockaddr_in6 *sin6;
679	struct sockaddr_in sin4;
680
681	if (sa->sa_family != AF_INET6)
682		return;
683	if (sa->sa_len != sizeof(struct sockaddr_in6) ||
684	    sizeof(sin4) > sa->sa_len)
685		return;
686	sin6 = (struct sockaddr_in6 *)sa;
687	if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
688		return;
689
690	memset(&sin4, 0, sizeof(sin4));
691	sin4.sin_family = AF_INET;
692	sin4.sin_len = sizeof(struct sockaddr_in);
693	memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
694	       sizeof(sin4.sin_addr));
695	sin4.sin_port = sin6->sin6_port;
696
697	memcpy(sa, &sin4, sin4.sin_len);
698}
699
700static void
701usage(void)
702{
703
704	fprintf(stderr, "%s\n%s\n%s\n%s\n",
705		"usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]",
706		"               [-b bind_address] [-f config_file]",
707		"               [-l [mode:]path] [-m mark_interval]",
708		"               [-P pid_file] [-p log_socket]");
709	exit(1);
710}
711
712/*
713 * Take a raw input line, decode the message, and print the message
714 * on the appropriate log files.
715 */
716static void
717printline(const char *hname, char *msg, int flags)
718{
719	char *p, *q;
720	long n;
721	int c, pri;
722	char line[MAXLINE + 1];
723
724	/* test for special codes */
725	p = msg;
726	pri = DEFUPRI;
727	if (*p == '<') {
728		errno = 0;
729		n = strtol(p + 1, &q, 10);
730		if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
731			p = q + 1;
732			pri = n;
733		}
734	}
735	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
736		pri = DEFUPRI;
737
738	/*
739	 * Don't allow users to log kernel messages.
740	 * NOTE: since LOG_KERN == 0 this will also match
741	 *       messages with no facility specified.
742	 */
743	if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
744		pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
745
746	q = line;
747
748	while ((c = (unsigned char)*p++) != '\0' &&
749	    q < &line[sizeof(line) - 4]) {
750		if (mask_C1 && (c & 0x80) && c < 0xA0) {
751			c &= 0x7F;
752			*q++ = 'M';
753			*q++ = '-';
754		}
755		if (isascii(c) && iscntrl(c)) {
756			if (c == '\n') {
757				*q++ = ' ';
758			} else if (c == '\t') {
759				*q++ = '\t';
760			} else {
761				*q++ = '^';
762				*q++ = c ^ 0100;
763			}
764		} else {
765			*q++ = c;
766		}
767	}
768	*q = '\0';
769
770	logmsg(pri, line, hname, flags);
771}
772
773/*
774 * Read /dev/klog while data are available, split into lines.
775 */
776static void
777readklog(void)
778{
779	char *p, *q, line[MAXLINE + 1];
780	int len, i;
781
782	len = 0;
783	for (;;) {
784		i = read(fklog, line + len, MAXLINE - 1 - len);
785		if (i > 0) {
786			line[i + len] = '\0';
787		} else {
788			if (i < 0 && errno != EINTR && errno != EAGAIN) {
789				logerror("klog");
790				fklog = -1;
791			}
792			break;
793		}
794
795		for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
796			*q = '\0';
797			printsys(p);
798		}
799		len = strlen(p);
800		if (len >= MAXLINE - 1) {
801			printsys(p);
802			len = 0;
803		}
804		if (len > 0)
805			memmove(line, p, len + 1);
806	}
807	if (len > 0)
808		printsys(line);
809}
810
811/*
812 * Take a raw input line from /dev/klog, format similar to syslog().
813 */
814static void
815printsys(char *msg)
816{
817	char *p, *q;
818	long n;
819	int flags, isprintf, pri;
820
821	flags = ISKERNEL | SYNC_FILE | ADDDATE;	/* fsync after write */
822	p = msg;
823	pri = DEFSPRI;
824	isprintf = 1;
825	if (*p == '<') {
826		errno = 0;
827		n = strtol(p + 1, &q, 10);
828		if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
829			p = q + 1;
830			pri = n;
831			isprintf = 0;
832		}
833	}
834	/*
835	 * Kernel printf's and LOG_CONSOLE messages have been displayed
836	 * on the console already.
837	 */
838	if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
839		flags |= IGN_CONS;
840	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
841		pri = DEFSPRI;
842	logmsg(pri, p, LocalHostName, flags);
843}
844
845static time_t	now;
846
847/*
848 * Match a program or host name against a specification.
849 * Return a non-0 value if the message must be ignored
850 * based on the specification.
851 */
852static int
853skip_message(const char *name, const char *spec, int checkcase)
854{
855	const char *s;
856	char prev, next;
857	int exclude = 0;
858	/* Behaviour on explicit match */
859
860	if (spec == NULL)
861		return 0;
862	switch (*spec) {
863	case '-':
864		exclude = 1;
865		/*FALLTHROUGH*/
866	case '+':
867		spec++;
868		break;
869	default:
870		break;
871	}
872	if (checkcase)
873		s = strstr (spec, name);
874	else
875		s = strcasestr (spec, name);
876
877	if (s != NULL) {
878		prev = (s == spec ? ',' : *(s - 1));
879		next = *(s + strlen (name));
880
881		if (prev == ',' && (next == '\0' || next == ','))
882			/* Explicit match: skip iff the spec is an
883			   exclusive one. */
884			return exclude;
885	}
886
887	/* No explicit match for this name: skip the message iff
888	   the spec is an inclusive one. */
889	return !exclude;
890}
891
892/*
893 * Log a message to the appropriate log files, users, etc. based on
894 * the priority.
895 */
896static void
897logmsg(int pri, const char *msg, const char *from, int flags)
898{
899	struct filed *f;
900	int i, fac, msglen, omask, prilev;
901	const char *timestamp;
902 	char prog[NAME_MAX+1];
903	char buf[MAXLINE+1];
904
905	dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
906	    pri, flags, from, msg);
907
908	omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
909
910	/*
911	 * Check to see if msg looks non-standard.
912	 */
913	msglen = strlen(msg);
914	if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
915	    msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
916		flags |= ADDDATE;
917
918	(void)time(&now);
919	if (flags & ADDDATE) {
920		timestamp = ctime(&now) + 4;
921	} else {
922		timestamp = msg;
923		msg += 16;
924		msglen -= 16;
925	}
926
927	/* skip leading blanks */
928	while (isspace(*msg)) {
929		msg++;
930		msglen--;
931	}
932
933	/* extract facility and priority level */
934	if (flags & MARK)
935		fac = LOG_NFACILITIES;
936	else
937		fac = LOG_FAC(pri);
938
939	/* Check maximum facility number. */
940	if (fac > LOG_NFACILITIES) {
941		(void)sigsetmask(omask);
942		return;
943	}
944
945	prilev = LOG_PRI(pri);
946
947	/* extract program name */
948	for (i = 0; i < NAME_MAX; i++) {
949		if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
950		    msg[i] == '/' || isspace(msg[i]))
951			break;
952		prog[i] = msg[i];
953	}
954	prog[i] = 0;
955
956	/* add kernel prefix for kernel messages */
957	if (flags & ISKERNEL) {
958		snprintf(buf, sizeof(buf), "%s: %s",
959		    use_bootfile ? bootfile : "kernel", msg);
960		msg = buf;
961		msglen = strlen(buf);
962	}
963
964	/* log the message to the particular outputs */
965	if (!Initialized) {
966		f = &consfile;
967		/*
968		 * Open in non-blocking mode to avoid hangs during open
969		 * and close(waiting for the port to drain).
970		 */
971		f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
972
973		if (f->f_file >= 0) {
974			(void)strlcpy(f->f_lasttime, timestamp,
975				sizeof(f->f_lasttime));
976			fprintlog(f, flags, msg);
977			(void)close(f->f_file);
978		}
979		(void)sigsetmask(omask);
980		return;
981	}
982	for (f = Files; f; f = f->f_next) {
983		/* skip messages that are incorrect priority */
984		if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
985		     ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
986		     ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
987		     )
988		    || f->f_pmask[fac] == INTERNAL_NOPRI)
989			continue;
990
991		/* skip messages with the incorrect hostname */
992		if (skip_message(from, f->f_host, 0))
993			continue;
994
995		/* skip messages with the incorrect program name */
996		if (skip_message(prog, f->f_program, 1))
997			continue;
998
999		/* skip message to console if it has already been printed */
1000		if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1001			continue;
1002
1003		/* don't output marks to recently written files */
1004		if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1005			continue;
1006
1007		/*
1008		 * suppress duplicate lines to this file
1009		 */
1010		if (no_compress - (f->f_type != F_PIPE) < 1 &&
1011		    (flags & MARK) == 0 && msglen == f->f_prevlen &&
1012		    f->f_prevline && !strcmp(msg, f->f_prevline) &&
1013		    !strcasecmp(from, f->f_prevhost)) {
1014			(void)strlcpy(f->f_lasttime, timestamp,
1015				sizeof(f->f_lasttime));
1016			f->f_prevcount++;
1017			dprintf("msg repeated %d times, %ld sec of %d\n",
1018			    f->f_prevcount, (long)(now - f->f_time),
1019			    repeatinterval[f->f_repeatcount]);
1020			/*
1021			 * If domark would have logged this by now,
1022			 * flush it now (so we don't hold isolated messages),
1023			 * but back off so we'll flush less often
1024			 * in the future.
1025			 */
1026			if (now > REPEATTIME(f)) {
1027				fprintlog(f, flags, (char *)NULL);
1028				BACKOFF(f);
1029			}
1030		} else {
1031			/* new line, save it */
1032			if (f->f_prevcount)
1033				fprintlog(f, 0, (char *)NULL);
1034			f->f_repeatcount = 0;
1035			f->f_prevpri = pri;
1036			(void)strlcpy(f->f_lasttime, timestamp,
1037				sizeof(f->f_lasttime));
1038			(void)strlcpy(f->f_prevhost, from,
1039			    sizeof(f->f_prevhost));
1040			if (msglen < MAXSVLINE) {
1041				f->f_prevlen = msglen;
1042				(void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
1043				fprintlog(f, flags, (char *)NULL);
1044			} else {
1045				f->f_prevline[0] = 0;
1046				f->f_prevlen = 0;
1047				fprintlog(f, flags, msg);
1048			}
1049		}
1050	}
1051	(void)sigsetmask(omask);
1052}
1053
1054static void
1055dofsync(void)
1056{
1057	struct filed *f;
1058
1059	for (f = Files; f; f = f->f_next) {
1060		if ((f->f_type == F_FILE) &&
1061		    (f->f_flags & FFLAG_NEEDSYNC)) {
1062			f->f_flags &= ~FFLAG_NEEDSYNC;
1063			(void)fsync(f->f_file);
1064		}
1065	}
1066}
1067
1068#define IOV_SIZE 7
1069static void
1070fprintlog(struct filed *f, int flags, const char *msg)
1071{
1072	struct iovec iov[IOV_SIZE];
1073	struct iovec *v;
1074	struct addrinfo *r;
1075	int i, l, lsent = 0;
1076	char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
1077	char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
1078	const char *msgret;
1079
1080	v = iov;
1081	if (f->f_type == F_WALL) {
1082		v->iov_base = greetings;
1083		/* The time displayed is not synchornized with the other log
1084		 * destinations (like messages).  Following fragment was using
1085		 * ctime(&now), which was updating the time every 30 sec.
1086		 * With f_lasttime, time is synchronized correctly.
1087		 */
1088		v->iov_len = snprintf(greetings, sizeof greetings,
1089		    "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
1090		    f->f_prevhost, f->f_lasttime);
1091		if (v->iov_len > 0)
1092			v++;
1093		v->iov_base = nul;
1094		v->iov_len = 0;
1095		v++;
1096	} else {
1097		v->iov_base = f->f_lasttime;
1098		v->iov_len = strlen(f->f_lasttime);
1099		v++;
1100		v->iov_base = space;
1101		v->iov_len = 1;
1102		v++;
1103	}
1104
1105	if (LogFacPri) {
1106	  	static char fp_buf[30];	/* Hollow laugh */
1107		int fac = f->f_prevpri & LOG_FACMASK;
1108		int pri = LOG_PRI(f->f_prevpri);
1109		const char *f_s = NULL;
1110		char f_n[5];	/* Hollow laugh */
1111		const char *p_s = NULL;
1112		char p_n[5];	/* Hollow laugh */
1113
1114		if (LogFacPri > 1) {
1115		  CODE *c;
1116
1117		  for (c = facilitynames; c->c_name; c++) {
1118		    if (c->c_val == fac) {
1119		      f_s = c->c_name;
1120		      break;
1121		    }
1122		  }
1123		  for (c = prioritynames; c->c_name; c++) {
1124		    if (c->c_val == pri) {
1125		      p_s = c->c_name;
1126		      break;
1127		    }
1128		  }
1129		}
1130		if (!f_s) {
1131		  snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1132		  f_s = f_n;
1133		}
1134		if (!p_s) {
1135		  snprintf(p_n, sizeof p_n, "%d", pri);
1136		  p_s = p_n;
1137		}
1138		snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
1139		v->iov_base = fp_buf;
1140		v->iov_len = strlen(fp_buf);
1141	} else {
1142		v->iov_base = nul;
1143		v->iov_len = 0;
1144	}
1145	v++;
1146
1147	v->iov_base = f->f_prevhost;
1148	v->iov_len = strlen(v->iov_base);
1149	v++;
1150	v->iov_base = space;
1151	v->iov_len = 1;
1152	v++;
1153
1154	if (msg) {
1155		wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1156		if (wmsg == NULL) {
1157			logerror("strdup");
1158			exit(1);
1159		}
1160		v->iov_base = wmsg;
1161		v->iov_len = strlen(msg);
1162	} else if (f->f_prevcount > 1) {
1163		v->iov_base = repbuf;
1164		v->iov_len = snprintf(repbuf, sizeof repbuf,
1165		    "last message repeated %d times", f->f_prevcount);
1166	} else if (f->f_prevline) {
1167		v->iov_base = f->f_prevline;
1168		v->iov_len = f->f_prevlen;
1169	} else {
1170		return;
1171	}
1172	v++;
1173
1174	dprintf("Logging to %s", TypeNames[f->f_type]);
1175	f->f_time = now;
1176
1177	switch (f->f_type) {
1178		int port;
1179	case F_UNUSED:
1180		dprintf("\n");
1181		break;
1182
1183	case F_FORW:
1184		port = (int)ntohs(((struct sockaddr_in *)
1185			    (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1186		if (port != 514) {
1187			dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port);
1188		} else {
1189			dprintf(" %s\n", f->f_un.f_forw.f_hname);
1190		}
1191		/* check for local vs remote messages */
1192		if (strcasecmp(f->f_prevhost, LocalHostName))
1193			l = snprintf(line, sizeof line - 1,
1194			    "<%d>%.15s Forwarded from %s: %s",
1195			    f->f_prevpri, (char *)iov[0].iov_base,
1196			    f->f_prevhost, (char *)iov[5].iov_base);
1197		else
1198			l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1199			     f->f_prevpri, (char *)iov[0].iov_base,
1200			    (char *)iov[5].iov_base);
1201		if (l < 0)
1202			l = 0;
1203		else if (l > MAXLINE)
1204			l = MAXLINE;
1205
1206		if (finet) {
1207			for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1208				for (i = 0; i < *finet; i++) {
1209#if 0
1210					/*
1211					 * should we check AF first, or just
1212					 * trial and error? FWD
1213					 */
1214					if (r->ai_family ==
1215					    address_family_of(finet[i+1]))
1216#endif
1217					lsent = sendto(finet[i+1], line, l, 0,
1218					    r->ai_addr, r->ai_addrlen);
1219					if (lsent == l)
1220						break;
1221				}
1222				if (lsent == l && !send_to_all)
1223					break;
1224			}
1225			dprintf("lsent/l: %d/%d\n", lsent, l);
1226			if (lsent != l) {
1227				int e = errno;
1228				logerror("sendto");
1229				errno = e;
1230				switch (errno) {
1231				case ENOBUFS:
1232				case ENETDOWN:
1233				case EHOSTUNREACH:
1234				case EHOSTDOWN:
1235					break;
1236				/* case EBADF: */
1237				/* case EACCES: */
1238				/* case ENOTSOCK: */
1239				/* case EFAULT: */
1240				/* case EMSGSIZE: */
1241				/* case EAGAIN: */
1242				/* case ENOBUFS: */
1243				/* case ECONNREFUSED: */
1244				default:
1245					dprintf("removing entry\n");
1246					f->f_type = F_UNUSED;
1247					break;
1248				}
1249			}
1250		}
1251		break;
1252
1253	case F_FILE:
1254		dprintf(" %s\n", f->f_un.f_fname);
1255		v->iov_base = lf;
1256		v->iov_len = 1;
1257		if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1258			/*
1259			 * If writev(2) fails for potentially transient errors
1260			 * like the filesystem being full, ignore it.
1261			 * Otherwise remove this logfile from the list.
1262			 */
1263			if (errno != ENOSPC) {
1264				int e = errno;
1265				(void)close(f->f_file);
1266				f->f_type = F_UNUSED;
1267				errno = e;
1268				logerror(f->f_un.f_fname);
1269			}
1270		} else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1271			f->f_flags |= FFLAG_NEEDSYNC;
1272			needdofsync = 1;
1273		}
1274		break;
1275
1276	case F_PIPE:
1277		dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1278		v->iov_base = lf;
1279		v->iov_len = 1;
1280		if (f->f_un.f_pipe.f_pid == 0) {
1281			if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1282						&f->f_un.f_pipe.f_pid)) < 0) {
1283				f->f_type = F_UNUSED;
1284				logerror(f->f_un.f_pipe.f_pname);
1285				break;
1286			}
1287		}
1288		if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1289			int e = errno;
1290			(void)close(f->f_file);
1291			if (f->f_un.f_pipe.f_pid > 0)
1292				deadq_enter(f->f_un.f_pipe.f_pid,
1293					    f->f_un.f_pipe.f_pname);
1294			f->f_un.f_pipe.f_pid = 0;
1295			errno = e;
1296			logerror(f->f_un.f_pipe.f_pname);
1297		}
1298		break;
1299
1300	case F_CONSOLE:
1301		if (flags & IGN_CONS) {
1302			dprintf(" (ignored)\n");
1303			break;
1304		}
1305		/* FALLTHROUGH */
1306
1307	case F_TTY:
1308		dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1309		v->iov_base = crlf;
1310		v->iov_len = 2;
1311
1312		errno = 0;	/* ttymsg() only sometimes returns an errno */
1313		if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) {
1314			f->f_type = F_UNUSED;
1315			logerror(msgret);
1316		}
1317		break;
1318
1319	case F_USERS:
1320	case F_WALL:
1321		dprintf("\n");
1322		v->iov_base = crlf;
1323		v->iov_len = 2;
1324		wallmsg(f, iov, IOV_SIZE);
1325		break;
1326	}
1327	f->f_prevcount = 0;
1328	free(wmsg);
1329}
1330
1331/*
1332 *  WALLMSG -- Write a message to the world at large
1333 *
1334 *	Write the specified message to either the entire
1335 *	world, or a list of approved users.
1336 */
1337static void
1338wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1339{
1340	static int reenter;			/* avoid calling ourselves */
1341	FILE *uf;
1342	struct utmp ut;
1343	int i;
1344	const char *p;
1345	char line[sizeof(ut.ut_line) + 1];
1346
1347	if (reenter++)
1348		return;
1349	if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1350		logerror(_PATH_UTMP);
1351		reenter = 0;
1352		return;
1353	}
1354	/* NOSTRICT */
1355	while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1356		if (ut.ut_name[0] == '\0')
1357			continue;
1358		/* We must use strncpy since ut_* may not be NUL terminated. */
1359		strncpy(line, ut.ut_line, sizeof(line) - 1);
1360		line[sizeof(line) - 1] = '\0';
1361		if (f->f_type == F_WALL) {
1362			if ((p = ttymsg(iov, iovlen, line, TTYMSGTIME)) !=
1363			    NULL) {
1364				errno = 0;	/* already in msg */
1365				logerror(p);
1366			}
1367			continue;
1368		}
1369		/* should we send the message to this user? */
1370		for (i = 0; i < MAXUNAMES; i++) {
1371			if (!f->f_un.f_uname[i][0])
1372				break;
1373			if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1374			    UT_NAMESIZE)) {
1375				if ((p = ttymsg(iov, iovlen, line, TTYMSGTIME))
1376				    != NULL) {
1377					errno = 0;	/* already in msg */
1378					logerror(p);
1379				}
1380				break;
1381			}
1382		}
1383	}
1384	(void)fclose(uf);
1385	reenter = 0;
1386}
1387
1388static void
1389reapchild(int signo __unused)
1390{
1391	int status;
1392	pid_t pid;
1393	struct filed *f;
1394
1395	while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1396		if (!Initialized)
1397			/* Don't tell while we are initting. */
1398			continue;
1399
1400		/* First, look if it's a process from the dead queue. */
1401		if (deadq_remove(pid))
1402			goto oncemore;
1403
1404		/* Now, look in list of active processes. */
1405		for (f = Files; f; f = f->f_next)
1406			if (f->f_type == F_PIPE &&
1407			    f->f_un.f_pipe.f_pid == pid) {
1408				(void)close(f->f_file);
1409				f->f_un.f_pipe.f_pid = 0;
1410				log_deadchild(pid, status,
1411					      f->f_un.f_pipe.f_pname);
1412				break;
1413			}
1414	  oncemore:
1415		continue;
1416	}
1417}
1418
1419/*
1420 * Return a printable representation of a host address.
1421 */
1422static const char *
1423cvthname(struct sockaddr *f)
1424{
1425	int error, hl;
1426	sigset_t omask, nmask;
1427	static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1428
1429	error = getnameinfo((struct sockaddr *)f,
1430			    ((struct sockaddr *)f)->sa_len,
1431			    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
1432	dprintf("cvthname(%s)\n", ip);
1433
1434	if (error) {
1435		dprintf("Malformed from address %s\n", gai_strerror(error));
1436		return ("???");
1437	}
1438	if (!resolve)
1439		return (ip);
1440
1441	sigemptyset(&nmask);
1442	sigaddset(&nmask, SIGHUP);
1443	sigprocmask(SIG_BLOCK, &nmask, &omask);
1444	error = getnameinfo((struct sockaddr *)f,
1445			    ((struct sockaddr *)f)->sa_len,
1446			    hname, sizeof hname, NULL, 0, NI_NAMEREQD);
1447	sigprocmask(SIG_SETMASK, &omask, NULL);
1448	if (error) {
1449		dprintf("Host name for your address (%s) unknown\n", ip);
1450		return (ip);
1451	}
1452	hl = strlen(hname);
1453	if (hl > 0 && hname[hl-1] == '.')
1454		hname[--hl] = '\0';
1455	trimdomain(hname, hl);
1456	return (hname);
1457}
1458
1459static void
1460dodie(int signo)
1461{
1462
1463	WantDie = signo;
1464}
1465
1466static void
1467domark(int signo __unused)
1468{
1469
1470	MarkSet = 1;
1471}
1472
1473/*
1474 * Print syslogd errors some place.
1475 */
1476static void
1477logerror(const char *type)
1478{
1479	char buf[512];
1480	static int recursed = 0;
1481
1482	/* If there's an error while trying to log an error, give up. */
1483	if (recursed)
1484		return;
1485	recursed++;
1486	if (errno)
1487		(void)snprintf(buf,
1488		    sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1489	else
1490		(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1491	errno = 0;
1492	dprintf("%s\n", buf);
1493	logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1494	recursed--;
1495}
1496
1497static void
1498die(int signo)
1499{
1500	struct filed *f;
1501	struct funix *fx;
1502	int was_initialized;
1503	char buf[100];
1504
1505	was_initialized = Initialized;
1506	Initialized = 0;	/* Don't log SIGCHLDs. */
1507	for (f = Files; f != NULL; f = f->f_next) {
1508		/* flush any pending output */
1509		if (f->f_prevcount)
1510			fprintlog(f, 0, (char *)NULL);
1511		if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) {
1512			(void)close(f->f_file);
1513			f->f_un.f_pipe.f_pid = 0;
1514		}
1515	}
1516	Initialized = was_initialized;
1517	if (signo) {
1518		dprintf("syslogd: exiting on signal %d\n", signo);
1519		(void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1520		errno = 0;
1521		logerror(buf);
1522	}
1523	STAILQ_FOREACH(fx, &funixes, next)
1524		(void)unlink(fx->name);
1525	pidfile_remove(pfh);
1526
1527	exit(1);
1528}
1529
1530/*
1531 *  INIT -- Initialize syslogd from configuration table
1532 */
1533static void
1534init(int signo)
1535{
1536	int i;
1537	FILE *cf;
1538	struct filed *f, *next, **nextp;
1539	char *p;
1540	char cline[LINE_MAX];
1541 	char prog[NAME_MAX+1];
1542	char host[MAXHOSTNAMELEN];
1543	char oldLocalHostName[MAXHOSTNAMELEN];
1544	char hostMsg[2*MAXHOSTNAMELEN+40];
1545	char bootfileMsg[LINE_MAX];
1546
1547	dprintf("init\n");
1548
1549	/*
1550	 * Load hostname (may have changed).
1551	 */
1552	if (signo != 0)
1553		(void)strlcpy(oldLocalHostName, LocalHostName,
1554		    sizeof(oldLocalHostName));
1555	if (gethostname(LocalHostName, sizeof(LocalHostName)))
1556		err(EX_OSERR, "gethostname() failed");
1557	if ((p = strchr(LocalHostName, '.')) != NULL) {
1558		*p++ = '\0';
1559		LocalDomain = p;
1560	} else {
1561		LocalDomain = "";
1562	}
1563
1564	/*
1565	 *  Close all open log files.
1566	 */
1567	Initialized = 0;
1568	for (f = Files; f != NULL; f = next) {
1569		/* flush any pending output */
1570		if (f->f_prevcount)
1571			fprintlog(f, 0, (char *)NULL);
1572
1573		switch (f->f_type) {
1574		case F_FILE:
1575		case F_FORW:
1576		case F_CONSOLE:
1577		case F_TTY:
1578			(void)close(f->f_file);
1579			break;
1580		case F_PIPE:
1581			if (f->f_un.f_pipe.f_pid > 0) {
1582				(void)close(f->f_file);
1583				deadq_enter(f->f_un.f_pipe.f_pid,
1584					    f->f_un.f_pipe.f_pname);
1585			}
1586			f->f_un.f_pipe.f_pid = 0;
1587			break;
1588		}
1589		next = f->f_next;
1590		if (f->f_program) free(f->f_program);
1591		if (f->f_host) free(f->f_host);
1592		free((char *)f);
1593	}
1594	Files = NULL;
1595	nextp = &Files;
1596
1597	/* open the configuration file */
1598	if ((cf = fopen(ConfFile, "r")) == NULL) {
1599		dprintf("cannot open %s\n", ConfFile);
1600		*nextp = (struct filed *)calloc(1, sizeof(*f));
1601		if (*nextp == NULL) {
1602			logerror("calloc");
1603			exit(1);
1604		}
1605		cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1606		(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1607		if ((*nextp)->f_next == NULL) {
1608			logerror("calloc");
1609			exit(1);
1610		}
1611		cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1612		Initialized = 1;
1613		return;
1614	}
1615
1616	/*
1617	 *  Foreach line in the conf table, open that file.
1618	 */
1619	f = NULL;
1620	(void)strlcpy(host, "*", sizeof(host));
1621	(void)strlcpy(prog, "*", sizeof(prog));
1622	while (fgets(cline, sizeof(cline), cf) != NULL) {
1623		/*
1624		 * check for end-of-section, comments, strip off trailing
1625		 * spaces and newline character. #!prog is treated specially:
1626		 * following lines apply only to that program.
1627		 */
1628		for (p = cline; isspace(*p); ++p)
1629			continue;
1630		if (*p == 0)
1631			continue;
1632		if (*p == '#') {
1633			p++;
1634			if (*p != '!' && *p != '+' && *p != '-')
1635				continue;
1636		}
1637		if (*p == '+' || *p == '-') {
1638			host[0] = *p++;
1639			while (isspace(*p))
1640				p++;
1641			if ((!*p) || (*p == '*')) {
1642				(void)strlcpy(host, "*", sizeof(host));
1643				continue;
1644			}
1645			if (*p == '@')
1646				p = LocalHostName;
1647			for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1648				if (!isalnum(*p) && *p != '.' && *p != '-'
1649				    && *p != ',' && *p != ':' && *p != '%')
1650					break;
1651				host[i] = *p++;
1652			}
1653			host[i] = '\0';
1654			continue;
1655		}
1656		if (*p == '!') {
1657			p++;
1658			while (isspace(*p)) p++;
1659			if ((!*p) || (*p == '*')) {
1660				(void)strlcpy(prog, "*", sizeof(prog));
1661				continue;
1662			}
1663			for (i = 0; i < NAME_MAX; i++) {
1664				if (!isprint(p[i]) || isspace(p[i]))
1665					break;
1666				prog[i] = p[i];
1667			}
1668			prog[i] = 0;
1669			continue;
1670		}
1671		for (p = cline + 1; *p != '\0'; p++) {
1672			if (*p != '#')
1673				continue;
1674			if (*(p - 1) == '\\') {
1675				strcpy(p - 1, p);
1676				p--;
1677				continue;
1678			}
1679			*p = '\0';
1680			break;
1681		}
1682		for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1683			cline[i] = '\0';
1684		f = (struct filed *)calloc(1, sizeof(*f));
1685		if (f == NULL) {
1686			logerror("calloc");
1687			exit(1);
1688		}
1689		*nextp = f;
1690		nextp = &f->f_next;
1691		cfline(cline, f, prog, host);
1692	}
1693
1694	/* close the configuration file */
1695	(void)fclose(cf);
1696
1697	Initialized = 1;
1698
1699	if (Debug) {
1700		int port;
1701		for (f = Files; f; f = f->f_next) {
1702			for (i = 0; i <= LOG_NFACILITIES; i++)
1703				if (f->f_pmask[i] == INTERNAL_NOPRI)
1704					printf("X ");
1705				else
1706					printf("%d ", f->f_pmask[i]);
1707			printf("%s: ", TypeNames[f->f_type]);
1708			switch (f->f_type) {
1709			case F_FILE:
1710				printf("%s", f->f_un.f_fname);
1711				break;
1712
1713			case F_CONSOLE:
1714			case F_TTY:
1715				printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1716				break;
1717
1718			case F_FORW:
1719				port = (int)ntohs(((struct sockaddr_in *)
1720				    (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1721				if (port != 514) {
1722					printf("%s:%d",
1723						f->f_un.f_forw.f_hname, port);
1724				} else {
1725					printf("%s", f->f_un.f_forw.f_hname);
1726				}
1727				break;
1728
1729			case F_PIPE:
1730				printf("%s", f->f_un.f_pipe.f_pname);
1731				break;
1732
1733			case F_USERS:
1734				for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1735					printf("%s, ", f->f_un.f_uname[i]);
1736				break;
1737			}
1738			if (f->f_program)
1739				printf(" (%s)", f->f_program);
1740			printf("\n");
1741		}
1742	}
1743
1744	logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1745	dprintf("syslogd: restarted\n");
1746	/*
1747	 * Log a change in hostname, but only on a restart.
1748	 */
1749	if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1750		(void)snprintf(hostMsg, sizeof(hostMsg),
1751		    "syslogd: hostname changed, \"%s\" to \"%s\"",
1752		    oldLocalHostName, LocalHostName);
1753		logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1754		dprintf("%s\n", hostMsg);
1755	}
1756	/*
1757	 * Log the kernel boot file if we aren't going to use it as
1758	 * the prefix, and if this is *not* a restart.
1759	 */
1760	if (signo == 0 && !use_bootfile) {
1761		(void)snprintf(bootfileMsg, sizeof(bootfileMsg),
1762		    "syslogd: kernel boot file is %s", bootfile);
1763		logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1764		dprintf("%s\n", bootfileMsg);
1765	}
1766}
1767
1768/*
1769 * Crack a configuration file line
1770 */
1771static void
1772cfline(const char *line, struct filed *f, const char *prog, const char *host)
1773{
1774	struct addrinfo hints, *res;
1775	int error, i, pri, syncfile;
1776	const char *p, *q;
1777	char *bp;
1778	char buf[MAXLINE], ebuf[100];
1779
1780	dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1781
1782	errno = 0;	/* keep strerror() stuff out of logerror messages */
1783
1784	/* clear out file entry */
1785	memset(f, 0, sizeof(*f));
1786	for (i = 0; i <= LOG_NFACILITIES; i++)
1787		f->f_pmask[i] = INTERNAL_NOPRI;
1788
1789	/* save hostname if any */
1790	if (host && *host == '*')
1791		host = NULL;
1792	if (host) {
1793		int hl;
1794
1795		f->f_host = strdup(host);
1796		if (f->f_host == NULL) {
1797			logerror("strdup");
1798			exit(1);
1799		}
1800		hl = strlen(f->f_host);
1801		if (hl > 0 && f->f_host[hl-1] == '.')
1802			f->f_host[--hl] = '\0';
1803		trimdomain(f->f_host, hl);
1804	}
1805
1806	/* save program name if any */
1807	if (prog && *prog == '*')
1808		prog = NULL;
1809	if (prog) {
1810		f->f_program = strdup(prog);
1811		if (f->f_program == NULL) {
1812			logerror("strdup");
1813			exit(1);
1814		}
1815	}
1816
1817	/* scan through the list of selectors */
1818	for (p = line; *p && *p != '\t' && *p != ' ';) {
1819		int pri_done;
1820		int pri_cmp;
1821		int pri_invert;
1822
1823		/* find the end of this facility name list */
1824		for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1825			continue;
1826
1827		/* get the priority comparison */
1828		pri_cmp = 0;
1829		pri_done = 0;
1830		pri_invert = 0;
1831		if (*q == '!') {
1832			pri_invert = 1;
1833			q++;
1834		}
1835		while (!pri_done) {
1836			switch (*q) {
1837			case '<':
1838				pri_cmp |= PRI_LT;
1839				q++;
1840				break;
1841			case '=':
1842				pri_cmp |= PRI_EQ;
1843				q++;
1844				break;
1845			case '>':
1846				pri_cmp |= PRI_GT;
1847				q++;
1848				break;
1849			default:
1850				pri_done++;
1851				break;
1852			}
1853		}
1854
1855		/* collect priority name */
1856		for (bp = buf; *q && !strchr("\t,; ", *q); )
1857			*bp++ = *q++;
1858		*bp = '\0';
1859
1860		/* skip cruft */
1861		while (strchr(",;", *q))
1862			q++;
1863
1864		/* decode priority name */
1865		if (*buf == '*') {
1866			pri = LOG_PRIMASK;
1867			pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1868		} else {
1869			/* Ignore trailing spaces. */
1870			for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
1871				buf[i] = '\0';
1872
1873			pri = decode(buf, prioritynames);
1874			if (pri < 0) {
1875				(void)snprintf(ebuf, sizeof ebuf,
1876				    "unknown priority name \"%s\"", buf);
1877				logerror(ebuf);
1878				return;
1879			}
1880		}
1881		if (!pri_cmp)
1882			pri_cmp = (UniquePriority)
1883				  ? (PRI_EQ)
1884				  : (PRI_EQ | PRI_GT)
1885				  ;
1886		if (pri_invert)
1887			pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
1888
1889		/* scan facilities */
1890		while (*p && !strchr("\t.; ", *p)) {
1891			for (bp = buf; *p && !strchr("\t,;. ", *p); )
1892				*bp++ = *p++;
1893			*bp = '\0';
1894
1895			if (*buf == '*') {
1896				for (i = 0; i < LOG_NFACILITIES; i++) {
1897					f->f_pmask[i] = pri;
1898					f->f_pcmp[i] = pri_cmp;
1899				}
1900			} else {
1901				i = decode(buf, facilitynames);
1902				if (i < 0) {
1903					(void)snprintf(ebuf, sizeof ebuf,
1904					    "unknown facility name \"%s\"",
1905					    buf);
1906					logerror(ebuf);
1907					return;
1908				}
1909				f->f_pmask[i >> 3] = pri;
1910				f->f_pcmp[i >> 3] = pri_cmp;
1911			}
1912			while (*p == ',' || *p == ' ')
1913				p++;
1914		}
1915
1916		p = q;
1917	}
1918
1919	/* skip to action part */
1920	while (*p == '\t' || *p == ' ')
1921		p++;
1922
1923	if (*p == '-') {
1924		syncfile = 0;
1925		p++;
1926	} else
1927		syncfile = 1;
1928
1929	switch (*p) {
1930	case '@':
1931		{
1932			char *tp;
1933			/*
1934			 * scan forward to see if there is a port defined.
1935			 * so we can't use strlcpy..
1936			 */
1937			i = sizeof(f->f_un.f_forw.f_hname);
1938			tp = f->f_un.f_forw.f_hname;
1939			p++;
1940
1941			while (*p && (*p != ':') && (i-- > 0)) {
1942				*tp++ = *p++;
1943			}
1944			*tp = '\0';
1945		}
1946		/* See if we copied a domain and have a port */
1947		if (*p == ':')
1948			p++;
1949		else
1950			p = NULL;
1951
1952		memset(&hints, 0, sizeof(hints));
1953		hints.ai_family = family;
1954		hints.ai_socktype = SOCK_DGRAM;
1955		error = getaddrinfo(f->f_un.f_forw.f_hname,
1956				p ? p : "syslog", &hints, &res);
1957		if (error) {
1958			logerror(gai_strerror(error));
1959			break;
1960		}
1961		f->f_un.f_forw.f_addr = res;
1962		f->f_type = F_FORW;
1963		break;
1964
1965	case '/':
1966		if ((f->f_file = open(p, logflags, 0600)) < 0) {
1967			f->f_type = F_UNUSED;
1968			logerror(p);
1969			break;
1970		}
1971		if (syncfile)
1972			f->f_flags |= FFLAG_SYNC;
1973		if (isatty(f->f_file)) {
1974			if (strcmp(p, ctty) == 0)
1975				f->f_type = F_CONSOLE;
1976			else
1977				f->f_type = F_TTY;
1978			(void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
1979			    sizeof(f->f_un.f_fname));
1980		} else {
1981			(void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
1982			f->f_type = F_FILE;
1983		}
1984		break;
1985
1986	case '|':
1987		f->f_un.f_pipe.f_pid = 0;
1988		(void)strlcpy(f->f_un.f_pipe.f_pname, p + 1,
1989		    sizeof(f->f_un.f_pipe.f_pname));
1990		f->f_type = F_PIPE;
1991		break;
1992
1993	case '*':
1994		f->f_type = F_WALL;
1995		break;
1996
1997	default:
1998		for (i = 0; i < MAXUNAMES && *p; i++) {
1999			for (q = p; *q && *q != ','; )
2000				q++;
2001			(void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
2002			if ((q - p) > UT_NAMESIZE)
2003				f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
2004			else
2005				f->f_un.f_uname[i][q - p] = '\0';
2006			while (*q == ',' || *q == ' ')
2007				q++;
2008			p = q;
2009		}
2010		f->f_type = F_USERS;
2011		break;
2012	}
2013}
2014
2015
2016/*
2017 *  Decode a symbolic name to a numeric value
2018 */
2019static int
2020decode(const char *name, CODE *codetab)
2021{
2022	CODE *c;
2023	char *p, buf[40];
2024
2025	if (isdigit(*name))
2026		return (atoi(name));
2027
2028	for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2029		if (isupper(*name))
2030			*p = tolower(*name);
2031		else
2032			*p = *name;
2033	}
2034	*p = '\0';
2035	for (c = codetab; c->c_name; c++)
2036		if (!strcmp(buf, c->c_name))
2037			return (c->c_val);
2038
2039	return (-1);
2040}
2041
2042static void
2043markit(void)
2044{
2045	struct filed *f;
2046	dq_t q, next;
2047
2048	now = time((time_t *)NULL);
2049	MarkSeq += TIMERINTVL;
2050	if (MarkSeq >= MarkInterval) {
2051		logmsg(LOG_INFO, "-- MARK --",
2052		    LocalHostName, ADDDATE|MARK);
2053		MarkSeq = 0;
2054	}
2055
2056	for (f = Files; f; f = f->f_next) {
2057		if (f->f_prevcount && now >= REPEATTIME(f)) {
2058			dprintf("flush %s: repeated %d times, %d sec.\n",
2059			    TypeNames[f->f_type], f->f_prevcount,
2060			    repeatinterval[f->f_repeatcount]);
2061			fprintlog(f, 0, (char *)NULL);
2062			BACKOFF(f);
2063		}
2064	}
2065
2066	/* Walk the dead queue, and see if we should signal somebody. */
2067	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2068		next = TAILQ_NEXT(q, dq_entries);
2069
2070		switch (q->dq_timeout) {
2071		case 0:
2072			/* Already signalled once, try harder now. */
2073			if (kill(q->dq_pid, SIGKILL) != 0)
2074				(void)deadq_remove(q->dq_pid);
2075			break;
2076
2077		case 1:
2078			/*
2079			 * Timed out on dead queue, send terminate
2080			 * signal.  Note that we leave the removal
2081			 * from the dead queue to reapchild(), which
2082			 * will also log the event (unless the process
2083			 * didn't even really exist, in case we simply
2084			 * drop it from the dead queue).
2085			 */
2086			if (kill(q->dq_pid, SIGTERM) != 0)
2087				(void)deadq_remove(q->dq_pid);
2088			/* FALLTHROUGH */
2089
2090		default:
2091			q->dq_timeout--;
2092		}
2093	}
2094	MarkSet = 0;
2095	(void)alarm(TIMERINTVL);
2096}
2097
2098/*
2099 * fork off and become a daemon, but wait for the child to come online
2100 * before returing to the parent, or we get disk thrashing at boot etc.
2101 * Set a timer so we don't hang forever if it wedges.
2102 */
2103static int
2104waitdaemon(int nochdir, int noclose, int maxwait)
2105{
2106	int fd;
2107	int status;
2108	pid_t pid, childpid;
2109
2110	switch (childpid = fork()) {
2111	case -1:
2112		return (-1);
2113	case 0:
2114		break;
2115	default:
2116		signal(SIGALRM, timedout);
2117		alarm(maxwait);
2118		while ((pid = wait3(&status, 0, NULL)) != -1) {
2119			if (WIFEXITED(status))
2120				errx(1, "child pid %d exited with return code %d",
2121					pid, WEXITSTATUS(status));
2122			if (WIFSIGNALED(status))
2123				errx(1, "child pid %d exited on signal %d%s",
2124					pid, WTERMSIG(status),
2125					WCOREDUMP(status) ? " (core dumped)" :
2126					"");
2127			if (pid == childpid)	/* it's gone... */
2128				break;
2129		}
2130		exit(0);
2131	}
2132
2133	if (setsid() == -1)
2134		return (-1);
2135
2136	if (!nochdir)
2137		(void)chdir("/");
2138
2139	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2140		(void)dup2(fd, STDIN_FILENO);
2141		(void)dup2(fd, STDOUT_FILENO);
2142		(void)dup2(fd, STDERR_FILENO);
2143		if (fd > 2)
2144			(void)close (fd);
2145	}
2146	return (getppid());
2147}
2148
2149/*
2150 * We get a SIGALRM from the child when it's running and finished doing it's
2151 * fsync()'s or O_SYNC writes for all the boot messages.
2152 *
2153 * We also get a signal from the kernel if the timer expires, so check to
2154 * see what happened.
2155 */
2156static void
2157timedout(int sig __unused)
2158{
2159	int left;
2160	left = alarm(0);
2161	signal(SIGALRM, SIG_DFL);
2162	if (left == 0)
2163		errx(1, "timed out waiting for child");
2164	else
2165		_exit(0);
2166}
2167
2168/*
2169 * Add `s' to the list of allowable peer addresses to accept messages
2170 * from.
2171 *
2172 * `s' is a string in the form:
2173 *
2174 *    [*]domainname[:{servicename|portnumber|*}]
2175 *
2176 * or
2177 *
2178 *    netaddr/maskbits[:{servicename|portnumber|*}]
2179 *
2180 * Returns -1 on error, 0 if the argument was valid.
2181 */
2182static int
2183allowaddr(char *s)
2184{
2185	char *cp1, *cp2;
2186	struct allowedpeer ap;
2187	struct servent *se;
2188	int masklen = -1;
2189	struct addrinfo hints, *res;
2190	struct in_addr *addrp, *maskp;
2191#ifdef INET6
2192	int i;
2193	u_int32_t *addr6p, *mask6p;
2194#endif
2195	char ip[NI_MAXHOST];
2196
2197#ifdef INET6
2198	if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2199#endif
2200		cp1 = s;
2201	if ((cp1 = strrchr(cp1, ':'))) {
2202		/* service/port provided */
2203		*cp1++ = '\0';
2204		if (strlen(cp1) == 1 && *cp1 == '*')
2205			/* any port allowed */
2206			ap.port = 0;
2207		else if ((se = getservbyname(cp1, "udp"))) {
2208			ap.port = ntohs(se->s_port);
2209		} else {
2210			ap.port = strtol(cp1, &cp2, 0);
2211			if (*cp2 != '\0')
2212				return (-1); /* port not numeric */
2213		}
2214	} else {
2215		if ((se = getservbyname("syslog", "udp")))
2216			ap.port = ntohs(se->s_port);
2217		else
2218			/* sanity, should not happen */
2219			ap.port = 514;
2220	}
2221
2222	if ((cp1 = strchr(s, '/')) != NULL &&
2223	    strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2224		*cp1 = '\0';
2225		if ((masklen = atoi(cp1 + 1)) < 0)
2226			return (-1);
2227	}
2228#ifdef INET6
2229	if (*s == '[') {
2230		cp2 = s + strlen(s) - 1;
2231		if (*cp2 == ']') {
2232			++s;
2233			*cp2 = '\0';
2234		} else {
2235			cp2 = NULL;
2236		}
2237	} else {
2238		cp2 = NULL;
2239	}
2240#endif
2241	memset(&hints, 0, sizeof(hints));
2242	hints.ai_family = PF_UNSPEC;
2243	hints.ai_socktype = SOCK_DGRAM;
2244	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2245	if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2246		ap.isnumeric = 1;
2247		memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2248		memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2249		ap.a_mask.ss_family = res->ai_family;
2250		if (res->ai_family == AF_INET) {
2251			ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2252			maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2253			addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2254			if (masklen < 0) {
2255				/* use default netmask */
2256				if (IN_CLASSA(ntohl(addrp->s_addr)))
2257					maskp->s_addr = htonl(IN_CLASSA_NET);
2258				else if (IN_CLASSB(ntohl(addrp->s_addr)))
2259					maskp->s_addr = htonl(IN_CLASSB_NET);
2260				else
2261					maskp->s_addr = htonl(IN_CLASSC_NET);
2262			} else if (masklen <= 32) {
2263				/* convert masklen to netmask */
2264				if (masklen == 0)
2265					maskp->s_addr = 0;
2266				else
2267					maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2268			} else {
2269				freeaddrinfo(res);
2270				return (-1);
2271			}
2272			/* Lose any host bits in the network number. */
2273			addrp->s_addr &= maskp->s_addr;
2274		}
2275#ifdef INET6
2276		else if (res->ai_family == AF_INET6 && masklen <= 128) {
2277			ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2278			if (masklen < 0)
2279				masklen = 128;
2280			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2281			/* convert masklen to netmask */
2282			while (masklen > 0) {
2283				if (masklen < 32) {
2284					*mask6p = htonl(~(0xffffffff >> masklen));
2285					break;
2286				}
2287				*mask6p++ = 0xffffffff;
2288				masklen -= 32;
2289			}
2290			/* Lose any host bits in the network number. */
2291			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2292			addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2293			for (i = 0; i < 4; i++)
2294				addr6p[i] &= mask6p[i];
2295		}
2296#endif
2297		else {
2298			freeaddrinfo(res);
2299			return (-1);
2300		}
2301		freeaddrinfo(res);
2302	} else {
2303		/* arg `s' is domain name */
2304		ap.isnumeric = 0;
2305		ap.a_name = s;
2306		if (cp1)
2307			*cp1 = '/';
2308#ifdef INET6
2309		if (cp2) {
2310			*cp2 = ']';
2311			--s;
2312		}
2313#endif
2314	}
2315
2316	if (Debug) {
2317		printf("allowaddr: rule %d: ", NumAllowed);
2318		if (ap.isnumeric) {
2319			printf("numeric, ");
2320			getnameinfo((struct sockaddr *)&ap.a_addr,
2321				    ((struct sockaddr *)&ap.a_addr)->sa_len,
2322				    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2323			printf("addr = %s, ", ip);
2324			getnameinfo((struct sockaddr *)&ap.a_mask,
2325				    ((struct sockaddr *)&ap.a_mask)->sa_len,
2326				    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2327			printf("mask = %s; ", ip);
2328		} else {
2329			printf("domainname = %s; ", ap.a_name);
2330		}
2331		printf("port = %d\n", ap.port);
2332	}
2333
2334	if ((AllowedPeers = realloc(AllowedPeers,
2335				    ++NumAllowed * sizeof(struct allowedpeer)))
2336	    == NULL) {
2337		logerror("realloc");
2338		exit(1);
2339	}
2340	memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2341	return (0);
2342}
2343
2344/*
2345 * Validate that the remote peer has permission to log to us.
2346 */
2347static int
2348validate(struct sockaddr *sa, const char *hname)
2349{
2350	int i;
2351	size_t l1, l2;
2352	char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2353	struct allowedpeer *ap;
2354	struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2355#ifdef INET6
2356	int j, reject;
2357	struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2358#endif
2359	struct addrinfo hints, *res;
2360	u_short sport;
2361
2362	if (NumAllowed == 0)
2363		/* traditional behaviour, allow everything */
2364		return (1);
2365
2366	(void)strlcpy(name, hname, sizeof(name));
2367	memset(&hints, 0, sizeof(hints));
2368	hints.ai_family = PF_UNSPEC;
2369	hints.ai_socktype = SOCK_DGRAM;
2370	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2371	if (getaddrinfo(name, NULL, &hints, &res) == 0)
2372		freeaddrinfo(res);
2373	else if (strchr(name, '.') == NULL) {
2374		strlcat(name, ".", sizeof name);
2375		strlcat(name, LocalDomain, sizeof name);
2376	}
2377	if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2378			NI_NUMERICHOST | NI_NUMERICSERV) != 0)
2379		return (0);	/* for safety, should not occur */
2380	dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2381		ip, port, name);
2382	sport = atoi(port);
2383
2384	/* now, walk down the list */
2385	for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2386		if (ap->port != 0 && ap->port != sport) {
2387			dprintf("rejected in rule %d due to port mismatch.\n", i);
2388			continue;
2389		}
2390
2391		if (ap->isnumeric) {
2392			if (ap->a_addr.ss_family != sa->sa_family) {
2393				dprintf("rejected in rule %d due to address family mismatch.\n", i);
2394				continue;
2395			}
2396			if (ap->a_addr.ss_family == AF_INET) {
2397				sin4 = (struct sockaddr_in *)sa;
2398				a4p = (struct sockaddr_in *)&ap->a_addr;
2399				m4p = (struct sockaddr_in *)&ap->a_mask;
2400				if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2401				    != a4p->sin_addr.s_addr) {
2402					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2403					continue;
2404				}
2405			}
2406#ifdef INET6
2407			else if (ap->a_addr.ss_family == AF_INET6) {
2408				sin6 = (struct sockaddr_in6 *)sa;
2409				a6p = (struct sockaddr_in6 *)&ap->a_addr;
2410				m6p = (struct sockaddr_in6 *)&ap->a_mask;
2411				if (a6p->sin6_scope_id != 0 &&
2412				    sin6->sin6_scope_id != a6p->sin6_scope_id) {
2413					dprintf("rejected in rule %d due to scope mismatch.\n", i);
2414					continue;
2415				}
2416				reject = 0;
2417				for (j = 0; j < 16; j += 4) {
2418					if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2419					    != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2420						++reject;
2421						break;
2422					}
2423				}
2424				if (reject) {
2425					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2426					continue;
2427				}
2428			}
2429#endif
2430			else
2431				continue;
2432		} else {
2433			cp = ap->a_name;
2434			l1 = strlen(name);
2435			if (*cp == '*') {
2436				/* allow wildmatch */
2437				cp++;
2438				l2 = strlen(cp);
2439				if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2440					dprintf("rejected in rule %d due to name mismatch.\n", i);
2441					continue;
2442				}
2443			} else {
2444				/* exact match */
2445				l2 = strlen(cp);
2446				if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2447					dprintf("rejected in rule %d due to name mismatch.\n", i);
2448					continue;
2449				}
2450			}
2451		}
2452		dprintf("accepted in rule %d.\n", i);
2453		return (1);	/* hooray! */
2454	}
2455	return (0);
2456}
2457
2458/*
2459 * Fairly similar to popen(3), but returns an open descriptor, as
2460 * opposed to a FILE *.
2461 */
2462static int
2463p_open(const char *prog, pid_t *rpid)
2464{
2465	int pfd[2], nulldesc, i;
2466	pid_t pid;
2467	sigset_t omask, mask;
2468	char *argv[4]; /* sh -c cmd NULL */
2469	char errmsg[200];
2470
2471	if (pipe(pfd) == -1)
2472		return (-1);
2473	if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2474		/* we are royally screwed anyway */
2475		return (-1);
2476
2477	sigemptyset(&mask);
2478	sigaddset(&mask, SIGALRM);
2479	sigaddset(&mask, SIGHUP);
2480	sigprocmask(SIG_BLOCK, &mask, &omask);
2481	switch ((pid = fork())) {
2482	case -1:
2483		sigprocmask(SIG_SETMASK, &omask, 0);
2484		close(nulldesc);
2485		return (-1);
2486
2487	case 0:
2488		argv[0] = strdup("sh");
2489		argv[1] = strdup("-c");
2490		argv[2] = strdup(prog);
2491		argv[3] = NULL;
2492		if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2493			logerror("strdup");
2494			exit(1);
2495		}
2496
2497		alarm(0);
2498		(void)setsid();	/* Avoid catching SIGHUPs. */
2499
2500		/*
2501		 * Throw away pending signals, and reset signal
2502		 * behaviour to standard values.
2503		 */
2504		signal(SIGALRM, SIG_IGN);
2505		signal(SIGHUP, SIG_IGN);
2506		sigprocmask(SIG_SETMASK, &omask, 0);
2507		signal(SIGPIPE, SIG_DFL);
2508		signal(SIGQUIT, SIG_DFL);
2509		signal(SIGALRM, SIG_DFL);
2510		signal(SIGHUP, SIG_DFL);
2511
2512		dup2(pfd[0], STDIN_FILENO);
2513		dup2(nulldesc, STDOUT_FILENO);
2514		dup2(nulldesc, STDERR_FILENO);
2515		for (i = getdtablesize(); i > 2; i--)
2516			(void)close(i);
2517
2518		(void)execvp(_PATH_BSHELL, argv);
2519		_exit(255);
2520	}
2521
2522	sigprocmask(SIG_SETMASK, &omask, 0);
2523	close(nulldesc);
2524	close(pfd[0]);
2525	/*
2526	 * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
2527	 * supposed to get an EWOULDBLOCK on writev(2), which is
2528	 * caught by the logic above anyway, which will in turn close
2529	 * the pipe, and fork a new logging subprocess if necessary.
2530	 * The stale subprocess will be killed some time later unless
2531	 * it terminated itself due to closing its input pipe (so we
2532	 * get rid of really dead puppies).
2533	 */
2534	if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2535		/* This is bad. */
2536		(void)snprintf(errmsg, sizeof errmsg,
2537			       "Warning: cannot change pipe to PID %d to "
2538			       "non-blocking behaviour.",
2539			       (int)pid);
2540		logerror(errmsg);
2541	}
2542	*rpid = pid;
2543	return (pfd[1]);
2544}
2545
2546static void
2547deadq_enter(pid_t pid, const char *name)
2548{
2549	dq_t p;
2550	int status;
2551
2552	/*
2553	 * Be paranoid, if we can't signal the process, don't enter it
2554	 * into the dead queue (perhaps it's already dead).  If possible,
2555	 * we try to fetch and log the child's status.
2556	 */
2557	if (kill(pid, 0) != 0) {
2558		if (waitpid(pid, &status, WNOHANG) > 0)
2559			log_deadchild(pid, status, name);
2560		return;
2561	}
2562
2563	p = malloc(sizeof(struct deadq_entry));
2564	if (p == NULL) {
2565		logerror("malloc");
2566		exit(1);
2567	}
2568
2569	p->dq_pid = pid;
2570	p->dq_timeout = DQ_TIMO_INIT;
2571	TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2572}
2573
2574static int
2575deadq_remove(pid_t pid)
2576{
2577	dq_t q;
2578
2579	TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2580		if (q->dq_pid == pid) {
2581			TAILQ_REMOVE(&deadq_head, q, dq_entries);
2582				free(q);
2583				return (1);
2584		}
2585	}
2586
2587	return (0);
2588}
2589
2590static void
2591log_deadchild(pid_t pid, int status, const char *name)
2592{
2593	int code;
2594	char buf[256];
2595	const char *reason;
2596
2597	errno = 0; /* Keep strerror() stuff out of logerror messages. */
2598	if (WIFSIGNALED(status)) {
2599		reason = "due to signal";
2600		code = WTERMSIG(status);
2601	} else {
2602		reason = "with status";
2603		code = WEXITSTATUS(status);
2604		if (code == 0)
2605			return;
2606	}
2607	(void)snprintf(buf, sizeof buf,
2608		       "Logging subprocess %d (%s) exited %s %d.",
2609		       pid, name, reason, code);
2610	logerror(buf);
2611}
2612
2613static int *
2614socksetup(int af, const char *bindhostname)
2615{
2616	struct addrinfo hints, *res, *r;
2617	int error, maxs, *s, *socks;
2618
2619	memset(&hints, 0, sizeof(hints));
2620	hints.ai_flags = AI_PASSIVE;
2621	hints.ai_family = af;
2622	hints.ai_socktype = SOCK_DGRAM;
2623	error = getaddrinfo(bindhostname, "syslog", &hints, &res);
2624	if (error) {
2625		logerror(gai_strerror(error));
2626		errno = 0;
2627		die(0);
2628	}
2629
2630	/* Count max number of sockets we may open */
2631	for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2632	socks = malloc((maxs+1) * sizeof(int));
2633	if (socks == NULL) {
2634		logerror("couldn't allocate memory for sockets");
2635		die(0);
2636	}
2637
2638	*socks = 0;   /* num of sockets counter at start of array */
2639	s = socks + 1;
2640	for (r = res; r; r = r->ai_next) {
2641		int on = 1;
2642		*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2643		if (*s < 0) {
2644			logerror("socket");
2645			continue;
2646		}
2647		if (r->ai_family == AF_INET6) {
2648			if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2649				       (char *)&on, sizeof (on)) < 0) {
2650				logerror("setsockopt");
2651				close(*s);
2652				continue;
2653			}
2654		}
2655		if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
2656			       (char *)&on, sizeof (on)) < 0) {
2657			logerror("setsockopt");
2658			close(*s);
2659			continue;
2660		}
2661		if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2662			close(*s);
2663			logerror("bind");
2664			continue;
2665		}
2666
2667		double_rbuf(*s);
2668
2669		(*socks)++;
2670		s++;
2671	}
2672
2673	if (*socks == 0) {
2674		free(socks);
2675		if (Debug)
2676			return (NULL);
2677		else
2678			die(0);
2679	}
2680	if (res)
2681		freeaddrinfo(res);
2682
2683	return (socks);
2684}
2685
2686static void
2687double_rbuf(int fd)
2688{
2689	socklen_t slen, len;
2690
2691	if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
2692		len *= 2;
2693		setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen);
2694	}
2695}
2696