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: releng/10.2/usr.sbin/syslogd/syslogd.c 280020 2015-03-15 09:15:11Z ed $");
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#define	RCVBUF_MINSIZE	(80 * 1024)	/* minimum size of dgram rcv buffer */
78
79#include <sys/param.h>
80#include <sys/ioctl.h>
81#include <sys/mman.h>
82#include <sys/stat.h>
83#include <sys/wait.h>
84#include <sys/socket.h>
85#include <sys/queue.h>
86#include <sys/uio.h>
87#include <sys/un.h>
88#include <sys/time.h>
89#include <sys/resource.h>
90#include <sys/syslimits.h>
91#include <sys/types.h>
92
93#include <netinet/in.h>
94#include <netdb.h>
95#include <arpa/inet.h>
96
97#include <ctype.h>
98#include <err.h>
99#include <errno.h>
100#include <fcntl.h>
101#include <libutil.h>
102#include <limits.h>
103#include <paths.h>
104#include <signal.h>
105#include <stdio.h>
106#include <stdlib.h>
107#include <string.h>
108#include <sysexits.h>
109#include <unistd.h>
110#include <utmpx.h>
111
112#include "pathnames.h"
113#include "ttymsg.h"
114
115#define SYSLOG_NAMES
116#include <sys/syslog.h>
117
118const char	*ConfFile = _PATH_LOGCONF;
119const char	*PidFile = _PATH_LOGPID;
120const char	ctty[] = _PATH_CONSOLE;
121
122#define	dprintf		if (Debug) printf
123
124#define	MAXUNAMES	20	/* maximum number of user names */
125
126/*
127 * Unix sockets.
128 * We have two default sockets, one with 666 permissions,
129 * and one for privileged programs.
130 */
131struct funix {
132	int			s;
133	const char		*name;
134	mode_t			mode;
135	STAILQ_ENTRY(funix)	next;
136};
137struct funix funix_secure =	{ -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
138				{ NULL } };
139struct funix funix_default =	{ -1, _PATH_LOG, DEFFILEMODE,
140				{ &funix_secure } };
141
142STAILQ_HEAD(, funix) funixes =	{ &funix_default,
143				&(funix_secure.next.stqe_next) };
144
145/*
146 * Flags to logmsg().
147 */
148
149#define	IGN_CONS	0x001	/* don't print on console */
150#define	SYNC_FILE	0x002	/* do fsync on file after printing */
151#define	ADDDATE		0x004	/* add a date to the message */
152#define	MARK		0x008	/* this message is a mark */
153#define	ISKERNEL	0x010	/* kernel generated message */
154
155/*
156 * This structure represents the files that will have log
157 * copies printed.
158 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
159 * or if f_type if F_PIPE and f_pid > 0.
160 */
161
162struct filed {
163	struct	filed *f_next;		/* next in linked list */
164	short	f_type;			/* entry type, see below */
165	short	f_file;			/* file descriptor */
166	time_t	f_time;			/* time this was last written */
167	char	*f_host;		/* host from which to recd. */
168	u_char	f_pmask[LOG_NFACILITIES+1];	/* priority mask */
169	u_char	f_pcmp[LOG_NFACILITIES+1];	/* compare priority */
170#define PRI_LT	0x1
171#define PRI_EQ	0x2
172#define PRI_GT	0x4
173	char	*f_program;		/* program this applies to */
174	union {
175		char	f_uname[MAXUNAMES][MAXLOGNAME];
176		struct {
177			char	f_hname[MAXHOSTNAMELEN];
178			struct addrinfo *f_addr;
179
180		} f_forw;		/* forwarding address */
181		char	f_fname[MAXPATHLEN];
182		struct {
183			char	f_pname[MAXPATHLEN];
184			pid_t	f_pid;
185		} f_pipe;
186	} f_un;
187	char	f_prevline[MAXSVLINE];		/* last message logged */
188	char	f_lasttime[16];			/* time of last occurrence */
189	char	f_prevhost[MAXHOSTNAMELEN];	/* host from which recd. */
190	int	f_prevpri;			/* pri of f_prevline */
191	int	f_prevlen;			/* length of f_prevline */
192	int	f_prevcount;			/* repetition cnt of prevline */
193	u_int	f_repeatcount;			/* number of "repeated" msgs */
194	int	f_flags;			/* file-specific flags */
195#define	FFLAG_SYNC 0x01
196#define	FFLAG_NEEDSYNC	0x02
197};
198
199/*
200 * Queue of about-to-be dead processes we should watch out for.
201 */
202
203TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
204struct stailhead *deadq_headp;
205
206struct deadq_entry {
207	pid_t				dq_pid;
208	int				dq_timeout;
209	TAILQ_ENTRY(deadq_entry)	dq_entries;
210};
211
212/*
213 * The timeout to apply to processes waiting on the dead queue.  Unit
214 * of measure is `mark intervals', i.e. 20 minutes by default.
215 * Processes on the dead queue will be terminated after that time.
216 */
217
218#define	 DQ_TIMO_INIT	2
219
220typedef struct deadq_entry *dq_t;
221
222
223/*
224 * Struct to hold records of network addresses that are allowed to log
225 * to us.
226 */
227struct allowedpeer {
228	int isnumeric;
229	u_short port;
230	union {
231		struct {
232			struct sockaddr_storage addr;
233			struct sockaddr_storage mask;
234		} numeric;
235		char *name;
236	} u;
237#define a_addr u.numeric.addr
238#define a_mask u.numeric.mask
239#define a_name u.name
240};
241
242
243/*
244 * Intervals at which we flush out "message repeated" messages,
245 * in seconds after previous message is logged.  After each flush,
246 * we move to the next interval until we reach the largest.
247 */
248int	repeatinterval[] = { 30, 120, 600 };	/* # of secs before flush */
249#define	MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
250#define	REPEATTIME(f)	((f)->f_time + repeatinterval[(f)->f_repeatcount])
251#define	BACKOFF(f)	{ if (++(f)->f_repeatcount > MAXREPEAT) \
252				 (f)->f_repeatcount = MAXREPEAT; \
253			}
254
255/* values for f_type */
256#define F_UNUSED	0		/* unused entry */
257#define F_FILE		1		/* regular file */
258#define F_TTY		2		/* terminal */
259#define F_CONSOLE	3		/* console terminal */
260#define F_FORW		4		/* remote machine */
261#define F_USERS		5		/* list of users */
262#define F_WALL		6		/* everyone logged on */
263#define F_PIPE		7		/* pipe to program */
264
265const char *TypeNames[8] = {
266	"UNUSED",	"FILE",		"TTY",		"CONSOLE",
267	"FORW",		"USERS",	"WALL",		"PIPE"
268};
269
270static struct filed *Files;	/* Log files that we write to */
271static struct filed consfile;	/* Console */
272
273static int	Debug;		/* debug flag */
274static int	resolve = 1;	/* resolve hostname */
275static char	LocalHostName[MAXHOSTNAMELEN];	/* our hostname */
276static const char *LocalDomain;	/* our local domain name */
277static int	*finet;		/* Internet datagram socket */
278static int	fklog = -1;	/* /dev/klog */
279static int	Initialized;	/* set when we have initialized ourselves */
280static int	MarkInterval = 20 * 60;	/* interval between marks in seconds */
281static int	MarkSeq;	/* mark sequence number */
282static int	NoBind;		/* don't bind() as suggested by RFC 3164 */
283static int	SecureMode;	/* when true, receive only unix domain socks */
284#ifdef INET6
285static int	family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
286#else
287static int	family = PF_INET; /* protocol family (IPv4 only) */
288#endif
289static int	mask_C1 = 1;	/* mask characters from 0x80 - 0x9F */
290static int	send_to_all;	/* send message to all IPv4/IPv6 addresses */
291static int	use_bootfile;	/* log entire bootfile for every kern msg */
292static int	no_compress;	/* don't compress messages (1=pipes, 2=all) */
293static int	logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
294
295static char	bootfile[MAXLINE+1]; /* booted kernel file */
296
297struct allowedpeer *AllowedPeers; /* List of allowed peers */
298static int	NumAllowed;	/* Number of entries in AllowedPeers */
299static int	RemoteAddDate;	/* Always set the date on remote messages */
300
301static int	UniquePriority;	/* Only log specified priority? */
302static int	LogFacPri;	/* Put facility and priority in log message: */
303				/* 0=no, 1=numeric, 2=names */
304static int	KeepKernFac;	/* Keep remotely logged kernel facility */
305static int	needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
306static struct pidfh *pfh;
307
308volatile sig_atomic_t MarkSet, WantDie;
309
310static int	allowaddr(char *);
311static void	cfline(const char *, struct filed *,
312		    const char *, const char *);
313static const char *cvthname(struct sockaddr *);
314static void	deadq_enter(pid_t, const char *);
315static int	deadq_remove(pid_t);
316static int	decode(const char *, const CODE *);
317static void	die(int);
318static void	dodie(int);
319static void	dofsync(void);
320static void	domark(int);
321static void	fprintlog(struct filed *, int, const char *);
322static int	*socksetup(int, char *);
323static void	init(int);
324static void	logerror(const char *);
325static void	logmsg(int, const char *, const char *, int);
326static void	log_deadchild(pid_t, int, const char *);
327static void	markit(void);
328static int	skip_message(const char *, const char *, int);
329static void	printline(const char *, char *, int);
330static void	printsys(char *);
331static int	p_open(const char *, pid_t *);
332static void	readklog(void);
333static void	reapchild(int);
334static void	usage(void);
335static int	validate(struct sockaddr *, const char *);
336static void	unmapped(struct sockaddr *);
337static void	wallmsg(struct filed *, struct iovec *, const int iovlen);
338static int	waitdaemon(int, int, int);
339static void	timedout(int);
340static void	increase_rcvbuf(int);
341
342int
343main(int argc, char *argv[])
344{
345	int ch, i, fdsrmax = 0, l;
346	struct sockaddr_un sunx, fromunix;
347	struct sockaddr_storage frominet;
348	fd_set *fdsr = NULL;
349	char line[MAXLINE + 1];
350	char *bindhostname;
351	const char *hname;
352	struct timeval tv, *tvp;
353	struct sigaction sact;
354	struct funix *fx, *fx1;
355	sigset_t mask;
356	pid_t ppid = 1, spid;
357	socklen_t len;
358
359	if (madvise(NULL, 0, MADV_PROTECT) != 0)
360		dprintf("madvise() failed: %s\n", strerror(errno));
361
362	bindhostname = NULL;
363	while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nNop:P:sS:Tuv"))
364	    != -1)
365		switch (ch) {
366		case '4':
367			family = PF_INET;
368			break;
369#ifdef INET6
370		case '6':
371			family = PF_INET6;
372			break;
373#endif
374		case '8':
375			mask_C1 = 0;
376			break;
377		case 'A':
378			send_to_all++;
379			break;
380		case 'a':		/* allow specific network addresses only */
381			if (allowaddr(optarg) == -1)
382				usage();
383			break;
384		case 'b':
385			bindhostname = optarg;
386			break;
387		case 'c':
388			no_compress++;
389			break;
390		case 'C':
391			logflags |= O_CREAT;
392			break;
393		case 'd':		/* debug */
394			Debug++;
395			break;
396		case 'f':		/* configuration file */
397			ConfFile = optarg;
398			break;
399		case 'k':		/* keep remote kern fac */
400			KeepKernFac = 1;
401			break;
402		case 'l':
403		    {
404			long	perml;
405			mode_t	mode;
406			char	*name, *ep;
407
408			if (optarg[0] == '/') {
409				mode = DEFFILEMODE;
410				name = optarg;
411			} else if ((name = strchr(optarg, ':')) != NULL) {
412				*name++ = '\0';
413				if (name[0] != '/')
414					errx(1, "socket name must be absolute "
415					    "path");
416				if (isdigit(*optarg)) {
417					perml = strtol(optarg, &ep, 8);
418				    if (*ep || perml < 0 ||
419					perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
420					    errx(1, "invalid mode %s, exiting",
421						optarg);
422				    mode = (mode_t )perml;
423				} else
424					errx(1, "invalid mode %s, exiting",
425					    optarg);
426			} else	/* doesn't begin with '/', and no ':' */
427				errx(1, "can't parse path %s", optarg);
428
429			if (strlen(name) >= sizeof(sunx.sun_path))
430				errx(1, "%s path too long, exiting", name);
431			if ((fx = malloc(sizeof(struct funix))) == NULL)
432				errx(1, "malloc failed");
433			fx->s = -1;
434			fx->name = name;
435			fx->mode = mode;
436			STAILQ_INSERT_TAIL(&funixes, fx, next);
437			break;
438		   }
439		case 'm':		/* mark interval */
440			MarkInterval = atoi(optarg) * 60;
441			break;
442		case 'N':
443			NoBind = 1;
444			SecureMode = 1;
445			break;
446		case 'n':
447			resolve = 0;
448			break;
449		case 'o':
450			use_bootfile = 1;
451			break;
452		case 'p':		/* path */
453			if (strlen(optarg) >= sizeof(sunx.sun_path))
454				errx(1, "%s path too long, exiting", optarg);
455			funix_default.name = optarg;
456			break;
457		case 'P':		/* path for alt. PID */
458			PidFile = optarg;
459			break;
460		case 's':		/* no network mode */
461			SecureMode++;
462			break;
463		case 'S':		/* path for privileged originator */
464			if (strlen(optarg) >= sizeof(sunx.sun_path))
465				errx(1, "%s path too long, exiting", optarg);
466			funix_secure.name = optarg;
467			break;
468		case 'T':
469			RemoteAddDate = 1;
470			break;
471		case 'u':		/* only log specified priority */
472			UniquePriority++;
473			break;
474		case 'v':		/* log facility and priority */
475		  	LogFacPri++;
476			break;
477		default:
478			usage();
479		}
480	if ((argc -= optind) != 0)
481		usage();
482
483	pfh = pidfile_open(PidFile, 0600, &spid);
484	if (pfh == NULL) {
485		if (errno == EEXIST)
486			errx(1, "syslogd already running, pid: %d", spid);
487		warn("cannot open pid file");
488	}
489
490	if (!Debug) {
491		ppid = waitdaemon(0, 0, 30);
492		if (ppid < 0) {
493			warn("could not become daemon");
494			pidfile_remove(pfh);
495			exit(1);
496		}
497	} else {
498		setlinebuf(stdout);
499	}
500
501	if (NumAllowed)
502		endservent();
503
504	consfile.f_type = F_CONSOLE;
505	(void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
506	    sizeof(consfile.f_un.f_fname));
507	(void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
508	(void)signal(SIGTERM, dodie);
509	(void)signal(SIGINT, Debug ? dodie : SIG_IGN);
510	(void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
511	/*
512	 * We don't want the SIGCHLD and SIGHUP handlers to interfere
513	 * with each other; they are likely candidates for being called
514	 * simultaneously (SIGHUP closes pipe descriptor, process dies,
515	 * SIGCHLD happens).
516	 */
517	sigemptyset(&mask);
518	sigaddset(&mask, SIGHUP);
519	sact.sa_handler = reapchild;
520	sact.sa_mask = mask;
521	sact.sa_flags = SA_RESTART;
522	(void)sigaction(SIGCHLD, &sact, NULL);
523	(void)signal(SIGALRM, domark);
524	(void)signal(SIGPIPE, SIG_IGN);	/* We'll catch EPIPE instead. */
525	(void)alarm(TIMERINTVL);
526
527	TAILQ_INIT(&deadq_head);
528
529#ifndef SUN_LEN
530#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
531#endif
532	STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) {
533		(void)unlink(fx->name);
534		memset(&sunx, 0, sizeof(sunx));
535		sunx.sun_family = AF_LOCAL;
536		(void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path));
537		fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0);
538		if (fx->s < 0 ||
539		    bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
540		    chmod(fx->name, fx->mode) < 0) {
541			(void)snprintf(line, sizeof line,
542					"cannot create %s", fx->name);
543			logerror(line);
544			dprintf("cannot create %s (%d)\n", fx->name, errno);
545			if (fx == &funix_default || fx == &funix_secure)
546				die(0);
547			else {
548				STAILQ_REMOVE(&funixes, fx, funix, next);
549				continue;
550			}
551		}
552		increase_rcvbuf(fx->s);
553	}
554	if (SecureMode <= 1)
555		finet = socksetup(family, bindhostname);
556
557	if (finet) {
558		if (SecureMode) {
559			for (i = 0; i < *finet; i++) {
560				if (shutdown(finet[i+1], SHUT_RD) < 0 &&
561				    errno != ENOTCONN) {
562					logerror("shutdown");
563					if (!Debug)
564						die(0);
565				}
566			}
567		} else {
568			dprintf("listening on inet and/or inet6 socket\n");
569		}
570		dprintf("sending on inet and/or inet6 socket\n");
571	}
572
573	if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
574		if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
575			fklog = -1;
576	if (fklog < 0)
577		dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
578
579	/* tuck my process id away */
580	pidfile_write(pfh);
581
582	dprintf("off & running....\n");
583
584	init(0);
585	/* prevent SIGHUP and SIGCHLD handlers from running in parallel */
586	sigemptyset(&mask);
587	sigaddset(&mask, SIGCHLD);
588	sact.sa_handler = init;
589	sact.sa_mask = mask;
590	sact.sa_flags = SA_RESTART;
591	(void)sigaction(SIGHUP, &sact, NULL);
592
593	tvp = &tv;
594	tv.tv_sec = tv.tv_usec = 0;
595
596	if (fklog != -1 && fklog > fdsrmax)
597		fdsrmax = fklog;
598	if (finet && !SecureMode) {
599		for (i = 0; i < *finet; i++) {
600		    if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
601			fdsrmax = finet[i+1];
602		}
603	}
604	STAILQ_FOREACH(fx, &funixes, next)
605		if (fx->s > fdsrmax)
606			fdsrmax = fx->s;
607
608	fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
609	    sizeof(fd_mask));
610	if (fdsr == NULL)
611		errx(1, "calloc fd_set");
612
613	for (;;) {
614		if (MarkSet)
615			markit();
616		if (WantDie)
617			die(WantDie);
618
619		bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
620		    sizeof(fd_mask));
621
622		if (fklog != -1)
623			FD_SET(fklog, fdsr);
624		if (finet && !SecureMode) {
625			for (i = 0; i < *finet; i++) {
626				if (finet[i+1] != -1)
627					FD_SET(finet[i+1], fdsr);
628			}
629		}
630		STAILQ_FOREACH(fx, &funixes, next)
631			FD_SET(fx->s, fdsr);
632
633		i = select(fdsrmax+1, fdsr, NULL, NULL,
634		    needdofsync ? &tv : tvp);
635		switch (i) {
636		case 0:
637			dofsync();
638			needdofsync = 0;
639			if (tvp) {
640				tvp = NULL;
641				if (ppid != 1)
642					kill(ppid, SIGALRM);
643			}
644			continue;
645		case -1:
646			if (errno != EINTR)
647				logerror("select");
648			continue;
649		}
650		if (fklog != -1 && FD_ISSET(fklog, fdsr))
651			readklog();
652		if (finet && !SecureMode) {
653			for (i = 0; i < *finet; i++) {
654				if (FD_ISSET(finet[i+1], fdsr)) {
655					len = sizeof(frominet);
656					l = recvfrom(finet[i+1], line, MAXLINE,
657					     0, (struct sockaddr *)&frominet,
658					     &len);
659					if (l > 0) {
660						line[l] = '\0';
661						hname = cvthname((struct sockaddr *)&frominet);
662						unmapped((struct sockaddr *)&frominet);
663						if (validate((struct sockaddr *)&frominet, hname))
664							printline(hname, line, RemoteAddDate ? ADDDATE : 0);
665					} else if (l < 0 && errno != EINTR)
666						logerror("recvfrom inet");
667				}
668			}
669		}
670		STAILQ_FOREACH(fx, &funixes, next) {
671			if (FD_ISSET(fx->s, fdsr)) {
672				len = sizeof(fromunix);
673				l = recvfrom(fx->s, line, MAXLINE, 0,
674				    (struct sockaddr *)&fromunix, &len);
675				if (l > 0) {
676					line[l] = '\0';
677					printline(LocalHostName, line, 0);
678				} else if (l < 0 && errno != EINTR)
679					logerror("recvfrom unix");
680			}
681		}
682	}
683	if (fdsr)
684		free(fdsr);
685}
686
687static void
688unmapped(struct sockaddr *sa)
689{
690	struct sockaddr_in6 *sin6;
691	struct sockaddr_in sin4;
692
693	if (sa->sa_family != AF_INET6)
694		return;
695	if (sa->sa_len != sizeof(struct sockaddr_in6) ||
696	    sizeof(sin4) > sa->sa_len)
697		return;
698	sin6 = (struct sockaddr_in6 *)sa;
699	if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
700		return;
701
702	memset(&sin4, 0, sizeof(sin4));
703	sin4.sin_family = AF_INET;
704	sin4.sin_len = sizeof(struct sockaddr_in);
705	memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
706	       sizeof(sin4.sin_addr));
707	sin4.sin_port = sin6->sin6_port;
708
709	memcpy(sa, &sin4, sin4.sin_len);
710}
711
712static void
713usage(void)
714{
715
716	fprintf(stderr, "%s\n%s\n%s\n%s\n",
717		"usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]",
718		"               [-b bind_address] [-f config_file]",
719		"               [-l [mode:]path] [-m mark_interval]",
720		"               [-P pid_file] [-p log_socket]");
721	exit(1);
722}
723
724/*
725 * Take a raw input line, decode the message, and print the message
726 * on the appropriate log files.
727 */
728static void
729printline(const char *hname, char *msg, int flags)
730{
731	char *p, *q;
732	long n;
733	int c, pri;
734	char line[MAXLINE + 1];
735
736	/* test for special codes */
737	p = msg;
738	pri = DEFUPRI;
739	if (*p == '<') {
740		errno = 0;
741		n = strtol(p + 1, &q, 10);
742		if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
743			p = q + 1;
744			pri = n;
745		}
746	}
747	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
748		pri = DEFUPRI;
749
750	/*
751	 * Don't allow users to log kernel messages.
752	 * NOTE: since LOG_KERN == 0 this will also match
753	 *       messages with no facility specified.
754	 */
755	if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
756		pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
757
758	q = line;
759
760	while ((c = (unsigned char)*p++) != '\0' &&
761	    q < &line[sizeof(line) - 4]) {
762		if (mask_C1 && (c & 0x80) && c < 0xA0) {
763			c &= 0x7F;
764			*q++ = 'M';
765			*q++ = '-';
766		}
767		if (isascii(c) && iscntrl(c)) {
768			if (c == '\n') {
769				*q++ = ' ';
770			} else if (c == '\t') {
771				*q++ = '\t';
772			} else {
773				*q++ = '^';
774				*q++ = c ^ 0100;
775			}
776		} else {
777			*q++ = c;
778		}
779	}
780	*q = '\0';
781
782	logmsg(pri, line, hname, flags);
783}
784
785/*
786 * Read /dev/klog while data are available, split into lines.
787 */
788static void
789readklog(void)
790{
791	char *p, *q, line[MAXLINE + 1];
792	int len, i;
793
794	len = 0;
795	for (;;) {
796		i = read(fklog, line + len, MAXLINE - 1 - len);
797		if (i > 0) {
798			line[i + len] = '\0';
799		} else {
800			if (i < 0 && errno != EINTR && errno != EAGAIN) {
801				logerror("klog");
802				fklog = -1;
803			}
804			break;
805		}
806
807		for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
808			*q = '\0';
809			printsys(p);
810		}
811		len = strlen(p);
812		if (len >= MAXLINE - 1) {
813			printsys(p);
814			len = 0;
815		}
816		if (len > 0)
817			memmove(line, p, len + 1);
818	}
819	if (len > 0)
820		printsys(line);
821}
822
823/*
824 * Take a raw input line from /dev/klog, format similar to syslog().
825 */
826static void
827printsys(char *msg)
828{
829	char *p, *q;
830	long n;
831	int flags, isprintf, pri;
832
833	flags = ISKERNEL | SYNC_FILE | ADDDATE;	/* fsync after write */
834	p = msg;
835	pri = DEFSPRI;
836	isprintf = 1;
837	if (*p == '<') {
838		errno = 0;
839		n = strtol(p + 1, &q, 10);
840		if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
841			p = q + 1;
842			pri = n;
843			isprintf = 0;
844		}
845	}
846	/*
847	 * Kernel printf's and LOG_CONSOLE messages have been displayed
848	 * on the console already.
849	 */
850	if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
851		flags |= IGN_CONS;
852	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
853		pri = DEFSPRI;
854	logmsg(pri, p, LocalHostName, flags);
855}
856
857static time_t	now;
858
859/*
860 * Match a program or host name against a specification.
861 * Return a non-0 value if the message must be ignored
862 * based on the specification.
863 */
864static int
865skip_message(const char *name, const char *spec, int checkcase)
866{
867	const char *s;
868	char prev, next;
869	int exclude = 0;
870	/* Behaviour on explicit match */
871
872	if (spec == NULL)
873		return 0;
874	switch (*spec) {
875	case '-':
876		exclude = 1;
877		/*FALLTHROUGH*/
878	case '+':
879		spec++;
880		break;
881	default:
882		break;
883	}
884	if (checkcase)
885		s = strstr (spec, name);
886	else
887		s = strcasestr (spec, name);
888
889	if (s != NULL) {
890		prev = (s == spec ? ',' : *(s - 1));
891		next = *(s + strlen (name));
892
893		if (prev == ',' && (next == '\0' || next == ','))
894			/* Explicit match: skip iff the spec is an
895			   exclusive one. */
896			return exclude;
897	}
898
899	/* No explicit match for this name: skip the message iff
900	   the spec is an inclusive one. */
901	return !exclude;
902}
903
904/*
905 * Log a message to the appropriate log files, users, etc. based on
906 * the priority.
907 */
908static void
909logmsg(int pri, const char *msg, const char *from, int flags)
910{
911	struct filed *f;
912	int i, fac, msglen, omask, prilev;
913	const char *timestamp;
914 	char prog[NAME_MAX+1];
915	char buf[MAXLINE+1];
916
917	dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
918	    pri, flags, from, msg);
919
920	omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
921
922	/*
923	 * Check to see if msg looks non-standard.
924	 */
925	msglen = strlen(msg);
926	if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
927	    msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
928		flags |= ADDDATE;
929
930	(void)time(&now);
931	if (flags & ADDDATE) {
932		timestamp = ctime(&now) + 4;
933	} else {
934		timestamp = msg;
935		msg += 16;
936		msglen -= 16;
937	}
938
939	/* skip leading blanks */
940	while (isspace(*msg)) {
941		msg++;
942		msglen--;
943	}
944
945	/* extract facility and priority level */
946	if (flags & MARK)
947		fac = LOG_NFACILITIES;
948	else
949		fac = LOG_FAC(pri);
950
951	/* Check maximum facility number. */
952	if (fac > LOG_NFACILITIES) {
953		(void)sigsetmask(omask);
954		return;
955	}
956
957	prilev = LOG_PRI(pri);
958
959	/* extract program name */
960	for (i = 0; i < NAME_MAX; i++) {
961		if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
962		    msg[i] == '/' || isspace(msg[i]))
963			break;
964		prog[i] = msg[i];
965	}
966	prog[i] = 0;
967
968	/* add kernel prefix for kernel messages */
969	if (flags & ISKERNEL) {
970		snprintf(buf, sizeof(buf), "%s: %s",
971		    use_bootfile ? bootfile : "kernel", msg);
972		msg = buf;
973		msglen = strlen(buf);
974	}
975
976	/* log the message to the particular outputs */
977	if (!Initialized) {
978		f = &consfile;
979		/*
980		 * Open in non-blocking mode to avoid hangs during open
981		 * and close(waiting for the port to drain).
982		 */
983		f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
984
985		if (f->f_file >= 0) {
986			(void)strlcpy(f->f_lasttime, timestamp,
987				sizeof(f->f_lasttime));
988			fprintlog(f, flags, msg);
989			(void)close(f->f_file);
990		}
991		(void)sigsetmask(omask);
992		return;
993	}
994	for (f = Files; f; f = f->f_next) {
995		/* skip messages that are incorrect priority */
996		if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
997		     ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
998		     ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
999		     )
1000		    || f->f_pmask[fac] == INTERNAL_NOPRI)
1001			continue;
1002
1003		/* skip messages with the incorrect hostname */
1004		if (skip_message(from, f->f_host, 0))
1005			continue;
1006
1007		/* skip messages with the incorrect program name */
1008		if (skip_message(prog, f->f_program, 1))
1009			continue;
1010
1011		/* skip message to console if it has already been printed */
1012		if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1013			continue;
1014
1015		/* don't output marks to recently written files */
1016		if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1017			continue;
1018
1019		/*
1020		 * suppress duplicate lines to this file
1021		 */
1022		if (no_compress - (f->f_type != F_PIPE) < 1 &&
1023		    (flags & MARK) == 0 && msglen == f->f_prevlen &&
1024		    !strcmp(msg, f->f_prevline) &&
1025		    !strcasecmp(from, f->f_prevhost)) {
1026			(void)strlcpy(f->f_lasttime, timestamp,
1027				sizeof(f->f_lasttime));
1028			f->f_prevcount++;
1029			dprintf("msg repeated %d times, %ld sec of %d\n",
1030			    f->f_prevcount, (long)(now - f->f_time),
1031			    repeatinterval[f->f_repeatcount]);
1032			/*
1033			 * If domark would have logged this by now,
1034			 * flush it now (so we don't hold isolated messages),
1035			 * but back off so we'll flush less often
1036			 * in the future.
1037			 */
1038			if (now > REPEATTIME(f)) {
1039				fprintlog(f, flags, (char *)NULL);
1040				BACKOFF(f);
1041			}
1042		} else {
1043			/* new line, save it */
1044			if (f->f_prevcount)
1045				fprintlog(f, 0, (char *)NULL);
1046			f->f_repeatcount = 0;
1047			f->f_prevpri = pri;
1048			(void)strlcpy(f->f_lasttime, timestamp,
1049				sizeof(f->f_lasttime));
1050			(void)strlcpy(f->f_prevhost, from,
1051			    sizeof(f->f_prevhost));
1052			if (msglen < MAXSVLINE) {
1053				f->f_prevlen = msglen;
1054				(void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
1055				fprintlog(f, flags, (char *)NULL);
1056			} else {
1057				f->f_prevline[0] = 0;
1058				f->f_prevlen = 0;
1059				fprintlog(f, flags, msg);
1060			}
1061		}
1062	}
1063	(void)sigsetmask(omask);
1064}
1065
1066static void
1067dofsync(void)
1068{
1069	struct filed *f;
1070
1071	for (f = Files; f; f = f->f_next) {
1072		if ((f->f_type == F_FILE) &&
1073		    (f->f_flags & FFLAG_NEEDSYNC)) {
1074			f->f_flags &= ~FFLAG_NEEDSYNC;
1075			(void)fsync(f->f_file);
1076		}
1077	}
1078}
1079
1080#define IOV_SIZE 7
1081static void
1082fprintlog(struct filed *f, int flags, const char *msg)
1083{
1084	struct iovec iov[IOV_SIZE];
1085	struct iovec *v;
1086	struct addrinfo *r;
1087	int i, l, lsent = 0;
1088	char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
1089	char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
1090	const char *msgret;
1091
1092	v = iov;
1093	if (f->f_type == F_WALL) {
1094		v->iov_base = greetings;
1095		/* The time displayed is not synchornized with the other log
1096		 * destinations (like messages).  Following fragment was using
1097		 * ctime(&now), which was updating the time every 30 sec.
1098		 * With f_lasttime, time is synchronized correctly.
1099		 */
1100		v->iov_len = snprintf(greetings, sizeof greetings,
1101		    "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
1102		    f->f_prevhost, f->f_lasttime);
1103		if (v->iov_len >= sizeof greetings)
1104			v->iov_len = sizeof greetings - 1;
1105		v++;
1106		v->iov_base = nul;
1107		v->iov_len = 0;
1108		v++;
1109	} else {
1110		v->iov_base = f->f_lasttime;
1111		v->iov_len = strlen(f->f_lasttime);
1112		v++;
1113		v->iov_base = space;
1114		v->iov_len = 1;
1115		v++;
1116	}
1117
1118	if (LogFacPri) {
1119	  	static char fp_buf[30];	/* Hollow laugh */
1120		int fac = f->f_prevpri & LOG_FACMASK;
1121		int pri = LOG_PRI(f->f_prevpri);
1122		const char *f_s = NULL;
1123		char f_n[5];	/* Hollow laugh */
1124		const char *p_s = NULL;
1125		char p_n[5];	/* Hollow laugh */
1126
1127		if (LogFacPri > 1) {
1128		  const CODE *c;
1129
1130		  for (c = facilitynames; c->c_name; c++) {
1131		    if (c->c_val == fac) {
1132		      f_s = c->c_name;
1133		      break;
1134		    }
1135		  }
1136		  for (c = prioritynames; c->c_name; c++) {
1137		    if (c->c_val == pri) {
1138		      p_s = c->c_name;
1139		      break;
1140		    }
1141		  }
1142		}
1143		if (!f_s) {
1144		  snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1145		  f_s = f_n;
1146		}
1147		if (!p_s) {
1148		  snprintf(p_n, sizeof p_n, "%d", pri);
1149		  p_s = p_n;
1150		}
1151		snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
1152		v->iov_base = fp_buf;
1153		v->iov_len = strlen(fp_buf);
1154	} else {
1155		v->iov_base = nul;
1156		v->iov_len = 0;
1157	}
1158	v++;
1159
1160	v->iov_base = f->f_prevhost;
1161	v->iov_len = strlen(v->iov_base);
1162	v++;
1163	v->iov_base = space;
1164	v->iov_len = 1;
1165	v++;
1166
1167	if (msg) {
1168		wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1169		if (wmsg == NULL) {
1170			logerror("strdup");
1171			exit(1);
1172		}
1173		v->iov_base = wmsg;
1174		v->iov_len = strlen(msg);
1175	} else if (f->f_prevcount > 1) {
1176		v->iov_base = repbuf;
1177		v->iov_len = snprintf(repbuf, sizeof repbuf,
1178		    "last message repeated %d times", f->f_prevcount);
1179	} else {
1180		v->iov_base = f->f_prevline;
1181		v->iov_len = f->f_prevlen;
1182	}
1183	v++;
1184
1185	dprintf("Logging to %s", TypeNames[f->f_type]);
1186	f->f_time = now;
1187
1188	switch (f->f_type) {
1189		int port;
1190	case F_UNUSED:
1191		dprintf("\n");
1192		break;
1193
1194	case F_FORW:
1195		port = (int)ntohs(((struct sockaddr_in *)
1196			    (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1197		if (port != 514) {
1198			dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port);
1199		} else {
1200			dprintf(" %s\n", f->f_un.f_forw.f_hname);
1201		}
1202		/* check for local vs remote messages */
1203		if (strcasecmp(f->f_prevhost, LocalHostName))
1204			l = snprintf(line, sizeof line - 1,
1205			    "<%d>%.15s Forwarded from %s: %s",
1206			    f->f_prevpri, (char *)iov[0].iov_base,
1207			    f->f_prevhost, (char *)iov[5].iov_base);
1208		else
1209			l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1210			     f->f_prevpri, (char *)iov[0].iov_base,
1211			    (char *)iov[5].iov_base);
1212		if (l < 0)
1213			l = 0;
1214		else if (l > MAXLINE)
1215			l = MAXLINE;
1216
1217		if (finet) {
1218			for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1219				for (i = 0; i < *finet; i++) {
1220#if 0
1221					/*
1222					 * should we check AF first, or just
1223					 * trial and error? FWD
1224					 */
1225					if (r->ai_family ==
1226					    address_family_of(finet[i+1]))
1227#endif
1228					lsent = sendto(finet[i+1], line, l, 0,
1229					    r->ai_addr, r->ai_addrlen);
1230					if (lsent == l)
1231						break;
1232				}
1233				if (lsent == l && !send_to_all)
1234					break;
1235			}
1236			dprintf("lsent/l: %d/%d\n", lsent, l);
1237			if (lsent != l) {
1238				int e = errno;
1239				logerror("sendto");
1240				errno = e;
1241				switch (errno) {
1242				case ENOBUFS:
1243				case ENETDOWN:
1244				case ENETUNREACH:
1245				case EHOSTUNREACH:
1246				case EHOSTDOWN:
1247				case EADDRNOTAVAIL:
1248					break;
1249				/* case EBADF: */
1250				/* case EACCES: */
1251				/* case ENOTSOCK: */
1252				/* case EFAULT: */
1253				/* case EMSGSIZE: */
1254				/* case EAGAIN: */
1255				/* case ENOBUFS: */
1256				/* case ECONNREFUSED: */
1257				default:
1258					dprintf("removing entry: errno=%d\n", e);
1259					f->f_type = F_UNUSED;
1260					break;
1261				}
1262			}
1263		}
1264		break;
1265
1266	case F_FILE:
1267		dprintf(" %s\n", f->f_un.f_fname);
1268		v->iov_base = lf;
1269		v->iov_len = 1;
1270		if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1271			/*
1272			 * If writev(2) fails for potentially transient errors
1273			 * like the filesystem being full, ignore it.
1274			 * Otherwise remove this logfile from the list.
1275			 */
1276			if (errno != ENOSPC) {
1277				int e = errno;
1278				(void)close(f->f_file);
1279				f->f_type = F_UNUSED;
1280				errno = e;
1281				logerror(f->f_un.f_fname);
1282			}
1283		} else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1284			f->f_flags |= FFLAG_NEEDSYNC;
1285			needdofsync = 1;
1286		}
1287		break;
1288
1289	case F_PIPE:
1290		dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1291		v->iov_base = lf;
1292		v->iov_len = 1;
1293		if (f->f_un.f_pipe.f_pid == 0) {
1294			if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1295						&f->f_un.f_pipe.f_pid)) < 0) {
1296				f->f_type = F_UNUSED;
1297				logerror(f->f_un.f_pipe.f_pname);
1298				break;
1299			}
1300		}
1301		if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1302			int e = errno;
1303			(void)close(f->f_file);
1304			if (f->f_un.f_pipe.f_pid > 0)
1305				deadq_enter(f->f_un.f_pipe.f_pid,
1306					    f->f_un.f_pipe.f_pname);
1307			f->f_un.f_pipe.f_pid = 0;
1308			errno = e;
1309			logerror(f->f_un.f_pipe.f_pname);
1310		}
1311		break;
1312
1313	case F_CONSOLE:
1314		if (flags & IGN_CONS) {
1315			dprintf(" (ignored)\n");
1316			break;
1317		}
1318		/* FALLTHROUGH */
1319
1320	case F_TTY:
1321		dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1322		v->iov_base = crlf;
1323		v->iov_len = 2;
1324
1325		errno = 0;	/* ttymsg() only sometimes returns an errno */
1326		if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) {
1327			f->f_type = F_UNUSED;
1328			logerror(msgret);
1329		}
1330		break;
1331
1332	case F_USERS:
1333	case F_WALL:
1334		dprintf("\n");
1335		v->iov_base = crlf;
1336		v->iov_len = 2;
1337		wallmsg(f, iov, IOV_SIZE);
1338		break;
1339	}
1340	f->f_prevcount = 0;
1341	free(wmsg);
1342}
1343
1344/*
1345 *  WALLMSG -- Write a message to the world at large
1346 *
1347 *	Write the specified message to either the entire
1348 *	world, or a list of approved users.
1349 */
1350static void
1351wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1352{
1353	static int reenter;			/* avoid calling ourselves */
1354	struct utmpx *ut;
1355	int i;
1356	const char *p;
1357
1358	if (reenter++)
1359		return;
1360	setutxent();
1361	/* NOSTRICT */
1362	while ((ut = getutxent()) != NULL) {
1363		if (ut->ut_type != USER_PROCESS)
1364			continue;
1365		if (f->f_type == F_WALL) {
1366			if ((p = ttymsg(iov, iovlen, ut->ut_line,
1367			    TTYMSGTIME)) != 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 (!strcmp(f->f_un.f_uname[i], ut->ut_user)) {
1378				if ((p = ttymsg(iov, iovlen, ut->ut_line,
1379				    TTYMSGTIME)) != NULL) {
1380					errno = 0;	/* already in msg */
1381					logerror(p);
1382				}
1383				break;
1384			}
1385		}
1386	}
1387	endutxent();
1388	reenter = 0;
1389}
1390
1391static void
1392reapchild(int signo __unused)
1393{
1394	int status;
1395	pid_t pid;
1396	struct filed *f;
1397
1398	while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1399		if (!Initialized)
1400			/* Don't tell while we are initting. */
1401			continue;
1402
1403		/* First, look if it's a process from the dead queue. */
1404		if (deadq_remove(pid))
1405			goto oncemore;
1406
1407		/* Now, look in list of active processes. */
1408		for (f = Files; f; f = f->f_next)
1409			if (f->f_type == F_PIPE &&
1410			    f->f_un.f_pipe.f_pid == pid) {
1411				(void)close(f->f_file);
1412				f->f_un.f_pipe.f_pid = 0;
1413				log_deadchild(pid, status,
1414					      f->f_un.f_pipe.f_pname);
1415				break;
1416			}
1417	  oncemore:
1418		continue;
1419	}
1420}
1421
1422/*
1423 * Return a printable representation of a host address.
1424 */
1425static const char *
1426cvthname(struct sockaddr *f)
1427{
1428	int error, hl;
1429	sigset_t omask, nmask;
1430	static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1431
1432	error = getnameinfo((struct sockaddr *)f,
1433			    ((struct sockaddr *)f)->sa_len,
1434			    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
1435	dprintf("cvthname(%s)\n", ip);
1436
1437	if (error) {
1438		dprintf("Malformed from address %s\n", gai_strerror(error));
1439		return ("???");
1440	}
1441	if (!resolve)
1442		return (ip);
1443
1444	sigemptyset(&nmask);
1445	sigaddset(&nmask, SIGHUP);
1446	sigprocmask(SIG_BLOCK, &nmask, &omask);
1447	error = getnameinfo((struct sockaddr *)f,
1448			    ((struct sockaddr *)f)->sa_len,
1449			    hname, sizeof hname, NULL, 0, NI_NAMEREQD);
1450	sigprocmask(SIG_SETMASK, &omask, NULL);
1451	if (error) {
1452		dprintf("Host name for your address (%s) unknown\n", ip);
1453		return (ip);
1454	}
1455	hl = strlen(hname);
1456	if (hl > 0 && hname[hl-1] == '.')
1457		hname[--hl] = '\0';
1458	trimdomain(hname, hl);
1459	return (hname);
1460}
1461
1462static void
1463dodie(int signo)
1464{
1465
1466	WantDie = signo;
1467}
1468
1469static void
1470domark(int signo __unused)
1471{
1472
1473	MarkSet = 1;
1474}
1475
1476/*
1477 * Print syslogd errors some place.
1478 */
1479static void
1480logerror(const char *type)
1481{
1482	char buf[512];
1483	static int recursed = 0;
1484
1485	/* If there's an error while trying to log an error, give up. */
1486	if (recursed)
1487		return;
1488	recursed++;
1489	if (errno)
1490		(void)snprintf(buf,
1491		    sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1492	else
1493		(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1494	errno = 0;
1495	dprintf("%s\n", buf);
1496	logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1497	recursed--;
1498}
1499
1500static void
1501die(int signo)
1502{
1503	struct filed *f;
1504	struct funix *fx;
1505	int was_initialized;
1506	char buf[100];
1507
1508	was_initialized = Initialized;
1509	Initialized = 0;	/* Don't log SIGCHLDs. */
1510	for (f = Files; f != NULL; f = f->f_next) {
1511		/* flush any pending output */
1512		if (f->f_prevcount)
1513			fprintlog(f, 0, (char *)NULL);
1514		if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) {
1515			(void)close(f->f_file);
1516			f->f_un.f_pipe.f_pid = 0;
1517		}
1518	}
1519	Initialized = was_initialized;
1520	if (signo) {
1521		dprintf("syslogd: exiting on signal %d\n", signo);
1522		(void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1523		errno = 0;
1524		logerror(buf);
1525	}
1526	STAILQ_FOREACH(fx, &funixes, next)
1527		(void)unlink(fx->name);
1528	pidfile_remove(pfh);
1529
1530	exit(1);
1531}
1532
1533/*
1534 *  INIT -- Initialize syslogd from configuration table
1535 */
1536static void
1537init(int signo)
1538{
1539	int i;
1540	FILE *cf;
1541	struct filed *f, *next, **nextp;
1542	char *p;
1543	char cline[LINE_MAX];
1544 	char prog[LINE_MAX];
1545	char host[MAXHOSTNAMELEN];
1546	char oldLocalHostName[MAXHOSTNAMELEN];
1547	char hostMsg[2*MAXHOSTNAMELEN+40];
1548	char bootfileMsg[LINE_MAX];
1549
1550	dprintf("init\n");
1551
1552	/*
1553	 * Load hostname (may have changed).
1554	 */
1555	if (signo != 0)
1556		(void)strlcpy(oldLocalHostName, LocalHostName,
1557		    sizeof(oldLocalHostName));
1558	if (gethostname(LocalHostName, sizeof(LocalHostName)))
1559		err(EX_OSERR, "gethostname() failed");
1560	if ((p = strchr(LocalHostName, '.')) != NULL) {
1561		*p++ = '\0';
1562		LocalDomain = p;
1563	} else {
1564		LocalDomain = "";
1565	}
1566
1567	/*
1568	 *  Close all open log files.
1569	 */
1570	Initialized = 0;
1571	for (f = Files; f != NULL; f = next) {
1572		/* flush any pending output */
1573		if (f->f_prevcount)
1574			fprintlog(f, 0, (char *)NULL);
1575
1576		switch (f->f_type) {
1577		case F_FILE:
1578		case F_FORW:
1579		case F_CONSOLE:
1580		case F_TTY:
1581			(void)close(f->f_file);
1582			break;
1583		case F_PIPE:
1584			if (f->f_un.f_pipe.f_pid > 0) {
1585				(void)close(f->f_file);
1586				deadq_enter(f->f_un.f_pipe.f_pid,
1587					    f->f_un.f_pipe.f_pname);
1588			}
1589			f->f_un.f_pipe.f_pid = 0;
1590			break;
1591		}
1592		next = f->f_next;
1593		if (f->f_program) free(f->f_program);
1594		if (f->f_host) free(f->f_host);
1595		free((char *)f);
1596	}
1597	Files = NULL;
1598	nextp = &Files;
1599
1600	/* open the configuration file */
1601	if ((cf = fopen(ConfFile, "r")) == NULL) {
1602		dprintf("cannot open %s\n", ConfFile);
1603		*nextp = (struct filed *)calloc(1, sizeof(*f));
1604		if (*nextp == NULL) {
1605			logerror("calloc");
1606			exit(1);
1607		}
1608		cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1609		(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1610		if ((*nextp)->f_next == NULL) {
1611			logerror("calloc");
1612			exit(1);
1613		}
1614		cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1615		Initialized = 1;
1616		return;
1617	}
1618
1619	/*
1620	 *  Foreach line in the conf table, open that file.
1621	 */
1622	f = NULL;
1623	(void)strlcpy(host, "*", sizeof(host));
1624	(void)strlcpy(prog, "*", sizeof(prog));
1625	while (fgets(cline, sizeof(cline), cf) != NULL) {
1626		/*
1627		 * check for end-of-section, comments, strip off trailing
1628		 * spaces and newline character. #!prog is treated specially:
1629		 * following lines apply only to that program.
1630		 */
1631		for (p = cline; isspace(*p); ++p)
1632			continue;
1633		if (*p == 0)
1634			continue;
1635		if (*p == '#') {
1636			p++;
1637			if (*p != '!' && *p != '+' && *p != '-')
1638				continue;
1639		}
1640		if (*p == '+' || *p == '-') {
1641			host[0] = *p++;
1642			while (isspace(*p))
1643				p++;
1644			if ((!*p) || (*p == '*')) {
1645				(void)strlcpy(host, "*", sizeof(host));
1646				continue;
1647			}
1648			if (*p == '@')
1649				p = LocalHostName;
1650			for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1651				if (!isalnum(*p) && *p != '.' && *p != '-'
1652				    && *p != ',' && *p != ':' && *p != '%')
1653					break;
1654				host[i] = *p++;
1655			}
1656			host[i] = '\0';
1657			continue;
1658		}
1659		if (*p == '!') {
1660			p++;
1661			while (isspace(*p)) p++;
1662			if ((!*p) || (*p == '*')) {
1663				(void)strlcpy(prog, "*", sizeof(prog));
1664				continue;
1665			}
1666			for (i = 0; i < LINE_MAX - 1; i++) {
1667				if (!isprint(p[i]) || isspace(p[i]))
1668					break;
1669				prog[i] = p[i];
1670			}
1671			prog[i] = 0;
1672			continue;
1673		}
1674		for (p = cline + 1; *p != '\0'; p++) {
1675			if (*p != '#')
1676				continue;
1677			if (*(p - 1) == '\\') {
1678				strcpy(p - 1, p);
1679				p--;
1680				continue;
1681			}
1682			*p = '\0';
1683			break;
1684		}
1685		for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1686			cline[i] = '\0';
1687		f = (struct filed *)calloc(1, sizeof(*f));
1688		if (f == NULL) {
1689			logerror("calloc");
1690			exit(1);
1691		}
1692		*nextp = f;
1693		nextp = &f->f_next;
1694		cfline(cline, f, prog, host);
1695	}
1696
1697	/* close the configuration file */
1698	(void)fclose(cf);
1699
1700	Initialized = 1;
1701
1702	if (Debug) {
1703		int port;
1704		for (f = Files; f; f = f->f_next) {
1705			for (i = 0; i <= LOG_NFACILITIES; i++)
1706				if (f->f_pmask[i] == INTERNAL_NOPRI)
1707					printf("X ");
1708				else
1709					printf("%d ", f->f_pmask[i]);
1710			printf("%s: ", TypeNames[f->f_type]);
1711			switch (f->f_type) {
1712			case F_FILE:
1713				printf("%s", f->f_un.f_fname);
1714				break;
1715
1716			case F_CONSOLE:
1717			case F_TTY:
1718				printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1719				break;
1720
1721			case F_FORW:
1722				port = (int)ntohs(((struct sockaddr_in *)
1723				    (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1724				if (port != 514) {
1725					printf("%s:%d",
1726						f->f_un.f_forw.f_hname, port);
1727				} else {
1728					printf("%s", f->f_un.f_forw.f_hname);
1729				}
1730				break;
1731
1732			case F_PIPE:
1733				printf("%s", f->f_un.f_pipe.f_pname);
1734				break;
1735
1736			case F_USERS:
1737				for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1738					printf("%s, ", f->f_un.f_uname[i]);
1739				break;
1740			}
1741			if (f->f_program)
1742				printf(" (%s)", f->f_program);
1743			printf("\n");
1744		}
1745	}
1746
1747	logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1748	dprintf("syslogd: restarted\n");
1749	/*
1750	 * Log a change in hostname, but only on a restart.
1751	 */
1752	if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1753		(void)snprintf(hostMsg, sizeof(hostMsg),
1754		    "syslogd: hostname changed, \"%s\" to \"%s\"",
1755		    oldLocalHostName, LocalHostName);
1756		logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1757		dprintf("%s\n", hostMsg);
1758	}
1759	/*
1760	 * Log the kernel boot file if we aren't going to use it as
1761	 * the prefix, and if this is *not* a restart.
1762	 */
1763	if (signo == 0 && !use_bootfile) {
1764		(void)snprintf(bootfileMsg, sizeof(bootfileMsg),
1765		    "syslogd: kernel boot file is %s", bootfile);
1766		logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1767		dprintf("%s\n", bootfileMsg);
1768	}
1769}
1770
1771/*
1772 * Crack a configuration file line
1773 */
1774static void
1775cfline(const char *line, struct filed *f, const char *prog, const char *host)
1776{
1777	struct addrinfo hints, *res;
1778	int error, i, pri, syncfile;
1779	const char *p, *q;
1780	char *bp;
1781	char buf[MAXLINE], ebuf[100];
1782
1783	dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1784
1785	errno = 0;	/* keep strerror() stuff out of logerror messages */
1786
1787	/* clear out file entry */
1788	memset(f, 0, sizeof(*f));
1789	for (i = 0; i <= LOG_NFACILITIES; i++)
1790		f->f_pmask[i] = INTERNAL_NOPRI;
1791
1792	/* save hostname if any */
1793	if (host && *host == '*')
1794		host = NULL;
1795	if (host) {
1796		int hl;
1797
1798		f->f_host = strdup(host);
1799		if (f->f_host == NULL) {
1800			logerror("strdup");
1801			exit(1);
1802		}
1803		hl = strlen(f->f_host);
1804		if (hl > 0 && f->f_host[hl-1] == '.')
1805			f->f_host[--hl] = '\0';
1806		trimdomain(f->f_host, hl);
1807	}
1808
1809	/* save program name if any */
1810	if (prog && *prog == '*')
1811		prog = NULL;
1812	if (prog) {
1813		f->f_program = strdup(prog);
1814		if (f->f_program == NULL) {
1815			logerror("strdup");
1816			exit(1);
1817		}
1818	}
1819
1820	/* scan through the list of selectors */
1821	for (p = line; *p && *p != '\t' && *p != ' ';) {
1822		int pri_done;
1823		int pri_cmp;
1824		int pri_invert;
1825
1826		/* find the end of this facility name list */
1827		for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1828			continue;
1829
1830		/* get the priority comparison */
1831		pri_cmp = 0;
1832		pri_done = 0;
1833		pri_invert = 0;
1834		if (*q == '!') {
1835			pri_invert = 1;
1836			q++;
1837		}
1838		while (!pri_done) {
1839			switch (*q) {
1840			case '<':
1841				pri_cmp |= PRI_LT;
1842				q++;
1843				break;
1844			case '=':
1845				pri_cmp |= PRI_EQ;
1846				q++;
1847				break;
1848			case '>':
1849				pri_cmp |= PRI_GT;
1850				q++;
1851				break;
1852			default:
1853				pri_done++;
1854				break;
1855			}
1856		}
1857
1858		/* collect priority name */
1859		for (bp = buf; *q && !strchr("\t,; ", *q); )
1860			*bp++ = *q++;
1861		*bp = '\0';
1862
1863		/* skip cruft */
1864		while (strchr(",;", *q))
1865			q++;
1866
1867		/* decode priority name */
1868		if (*buf == '*') {
1869			pri = LOG_PRIMASK;
1870			pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1871		} else {
1872			/* Ignore trailing spaces. */
1873			for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
1874				buf[i] = '\0';
1875
1876			pri = decode(buf, prioritynames);
1877			if (pri < 0) {
1878				errno = 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					errno = 0;
1908					(void)snprintf(ebuf, sizeof ebuf,
1909					    "unknown facility name \"%s\"",
1910					    buf);
1911					logerror(ebuf);
1912					return;
1913				}
1914				f->f_pmask[i >> 3] = pri;
1915				f->f_pcmp[i >> 3] = pri_cmp;
1916			}
1917			while (*p == ',' || *p == ' ')
1918				p++;
1919		}
1920
1921		p = q;
1922	}
1923
1924	/* skip to action part */
1925	while (*p == '\t' || *p == ' ')
1926		p++;
1927
1928	if (*p == '-') {
1929		syncfile = 0;
1930		p++;
1931	} else
1932		syncfile = 1;
1933
1934	switch (*p) {
1935	case '@':
1936		{
1937			char *tp;
1938			char endkey = ':';
1939			/*
1940			 * scan forward to see if there is a port defined.
1941			 * so we can't use strlcpy..
1942			 */
1943			i = sizeof(f->f_un.f_forw.f_hname);
1944			tp = f->f_un.f_forw.f_hname;
1945			p++;
1946
1947			/*
1948			 * an ipv6 address should start with a '[' in that case
1949			 * we should scan for a ']'
1950			 */
1951			if (*p == '[') {
1952				p++;
1953				endkey = ']';
1954			}
1955			while (*p && (*p != endkey) && (i-- > 0)) {
1956				*tp++ = *p++;
1957			}
1958			if (endkey == ']' && *p == endkey)
1959				p++;
1960			*tp = '\0';
1961		}
1962		/* See if we copied a domain and have a port */
1963		if (*p == ':')
1964			p++;
1965		else
1966			p = NULL;
1967
1968		memset(&hints, 0, sizeof(hints));
1969		hints.ai_family = family;
1970		hints.ai_socktype = SOCK_DGRAM;
1971		error = getaddrinfo(f->f_un.f_forw.f_hname,
1972				p ? p : "syslog", &hints, &res);
1973		if (error) {
1974			logerror(gai_strerror(error));
1975			break;
1976		}
1977		f->f_un.f_forw.f_addr = res;
1978		f->f_type = F_FORW;
1979		break;
1980
1981	case '/':
1982		if ((f->f_file = open(p, logflags, 0600)) < 0) {
1983			f->f_type = F_UNUSED;
1984			logerror(p);
1985			break;
1986		}
1987		if (syncfile)
1988			f->f_flags |= FFLAG_SYNC;
1989		if (isatty(f->f_file)) {
1990			if (strcmp(p, ctty) == 0)
1991				f->f_type = F_CONSOLE;
1992			else
1993				f->f_type = F_TTY;
1994			(void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
1995			    sizeof(f->f_un.f_fname));
1996		} else {
1997			(void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
1998			f->f_type = F_FILE;
1999		}
2000		break;
2001
2002	case '|':
2003		f->f_un.f_pipe.f_pid = 0;
2004		(void)strlcpy(f->f_un.f_pipe.f_pname, p + 1,
2005		    sizeof(f->f_un.f_pipe.f_pname));
2006		f->f_type = F_PIPE;
2007		break;
2008
2009	case '*':
2010		f->f_type = F_WALL;
2011		break;
2012
2013	default:
2014		for (i = 0; i < MAXUNAMES && *p; i++) {
2015			for (q = p; *q && *q != ','; )
2016				q++;
2017			(void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1);
2018			if ((q - p) >= MAXLOGNAME)
2019				f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0';
2020			else
2021				f->f_un.f_uname[i][q - p] = '\0';
2022			while (*q == ',' || *q == ' ')
2023				q++;
2024			p = q;
2025		}
2026		f->f_type = F_USERS;
2027		break;
2028	}
2029}
2030
2031
2032/*
2033 *  Decode a symbolic name to a numeric value
2034 */
2035static int
2036decode(const char *name, const CODE *codetab)
2037{
2038	const CODE *c;
2039	char *p, buf[40];
2040
2041	if (isdigit(*name))
2042		return (atoi(name));
2043
2044	for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2045		if (isupper(*name))
2046			*p = tolower(*name);
2047		else
2048			*p = *name;
2049	}
2050	*p = '\0';
2051	for (c = codetab; c->c_name; c++)
2052		if (!strcmp(buf, c->c_name))
2053			return (c->c_val);
2054
2055	return (-1);
2056}
2057
2058static void
2059markit(void)
2060{
2061	struct filed *f;
2062	dq_t q, next;
2063
2064	now = time((time_t *)NULL);
2065	MarkSeq += TIMERINTVL;
2066	if (MarkSeq >= MarkInterval) {
2067		logmsg(LOG_INFO, "-- MARK --",
2068		    LocalHostName, ADDDATE|MARK);
2069		MarkSeq = 0;
2070	}
2071
2072	for (f = Files; f; f = f->f_next) {
2073		if (f->f_prevcount && now >= REPEATTIME(f)) {
2074			dprintf("flush %s: repeated %d times, %d sec.\n",
2075			    TypeNames[f->f_type], f->f_prevcount,
2076			    repeatinterval[f->f_repeatcount]);
2077			fprintlog(f, 0, (char *)NULL);
2078			BACKOFF(f);
2079		}
2080	}
2081
2082	/* Walk the dead queue, and see if we should signal somebody. */
2083	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2084		next = TAILQ_NEXT(q, dq_entries);
2085
2086		switch (q->dq_timeout) {
2087		case 0:
2088			/* Already signalled once, try harder now. */
2089			if (kill(q->dq_pid, SIGKILL) != 0)
2090				(void)deadq_remove(q->dq_pid);
2091			break;
2092
2093		case 1:
2094			/*
2095			 * Timed out on dead queue, send terminate
2096			 * signal.  Note that we leave the removal
2097			 * from the dead queue to reapchild(), which
2098			 * will also log the event (unless the process
2099			 * didn't even really exist, in case we simply
2100			 * drop it from the dead queue).
2101			 */
2102			if (kill(q->dq_pid, SIGTERM) != 0)
2103				(void)deadq_remove(q->dq_pid);
2104			/* FALLTHROUGH */
2105
2106		default:
2107			q->dq_timeout--;
2108		}
2109	}
2110	MarkSet = 0;
2111	(void)alarm(TIMERINTVL);
2112}
2113
2114/*
2115 * fork off and become a daemon, but wait for the child to come online
2116 * before returing to the parent, or we get disk thrashing at boot etc.
2117 * Set a timer so we don't hang forever if it wedges.
2118 */
2119static int
2120waitdaemon(int nochdir, int noclose, int maxwait)
2121{
2122	int fd;
2123	int status;
2124	pid_t pid, childpid;
2125
2126	switch (childpid = fork()) {
2127	case -1:
2128		return (-1);
2129	case 0:
2130		break;
2131	default:
2132		signal(SIGALRM, timedout);
2133		alarm(maxwait);
2134		while ((pid = wait3(&status, 0, NULL)) != -1) {
2135			if (WIFEXITED(status))
2136				errx(1, "child pid %d exited with return code %d",
2137					pid, WEXITSTATUS(status));
2138			if (WIFSIGNALED(status))
2139				errx(1, "child pid %d exited on signal %d%s",
2140					pid, WTERMSIG(status),
2141					WCOREDUMP(status) ? " (core dumped)" :
2142					"");
2143			if (pid == childpid)	/* it's gone... */
2144				break;
2145		}
2146		exit(0);
2147	}
2148
2149	if (setsid() == -1)
2150		return (-1);
2151
2152	if (!nochdir)
2153		(void)chdir("/");
2154
2155	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2156		(void)dup2(fd, STDIN_FILENO);
2157		(void)dup2(fd, STDOUT_FILENO);
2158		(void)dup2(fd, STDERR_FILENO);
2159		if (fd > 2)
2160			(void)close (fd);
2161	}
2162	return (getppid());
2163}
2164
2165/*
2166 * We get a SIGALRM from the child when it's running and finished doing it's
2167 * fsync()'s or O_SYNC writes for all the boot messages.
2168 *
2169 * We also get a signal from the kernel if the timer expires, so check to
2170 * see what happened.
2171 */
2172static void
2173timedout(int sig __unused)
2174{
2175	int left;
2176	left = alarm(0);
2177	signal(SIGALRM, SIG_DFL);
2178	if (left == 0)
2179		errx(1, "timed out waiting for child");
2180	else
2181		_exit(0);
2182}
2183
2184/*
2185 * Add `s' to the list of allowable peer addresses to accept messages
2186 * from.
2187 *
2188 * `s' is a string in the form:
2189 *
2190 *    [*]domainname[:{servicename|portnumber|*}]
2191 *
2192 * or
2193 *
2194 *    netaddr/maskbits[:{servicename|portnumber|*}]
2195 *
2196 * Returns -1 on error, 0 if the argument was valid.
2197 */
2198static int
2199allowaddr(char *s)
2200{
2201	char *cp1, *cp2;
2202	struct allowedpeer ap;
2203	struct servent *se;
2204	int masklen = -1;
2205	struct addrinfo hints, *res;
2206	struct in_addr *addrp, *maskp;
2207#ifdef INET6
2208	int i;
2209	u_int32_t *addr6p, *mask6p;
2210#endif
2211	char ip[NI_MAXHOST];
2212
2213#ifdef INET6
2214	if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2215#endif
2216		cp1 = s;
2217	if ((cp1 = strrchr(cp1, ':'))) {
2218		/* service/port provided */
2219		*cp1++ = '\0';
2220		if (strlen(cp1) == 1 && *cp1 == '*')
2221			/* any port allowed */
2222			ap.port = 0;
2223		else if ((se = getservbyname(cp1, "udp"))) {
2224			ap.port = ntohs(se->s_port);
2225		} else {
2226			ap.port = strtol(cp1, &cp2, 0);
2227			if (*cp2 != '\0')
2228				return (-1); /* port not numeric */
2229		}
2230	} else {
2231		if ((se = getservbyname("syslog", "udp")))
2232			ap.port = ntohs(se->s_port);
2233		else
2234			/* sanity, should not happen */
2235			ap.port = 514;
2236	}
2237
2238	if ((cp1 = strchr(s, '/')) != NULL &&
2239	    strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2240		*cp1 = '\0';
2241		if ((masklen = atoi(cp1 + 1)) < 0)
2242			return (-1);
2243	}
2244#ifdef INET6
2245	if (*s == '[') {
2246		cp2 = s + strlen(s) - 1;
2247		if (*cp2 == ']') {
2248			++s;
2249			*cp2 = '\0';
2250		} else {
2251			cp2 = NULL;
2252		}
2253	} else {
2254		cp2 = NULL;
2255	}
2256#endif
2257	memset(&hints, 0, sizeof(hints));
2258	hints.ai_family = PF_UNSPEC;
2259	hints.ai_socktype = SOCK_DGRAM;
2260	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2261	if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2262		ap.isnumeric = 1;
2263		memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2264		memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2265		ap.a_mask.ss_family = res->ai_family;
2266		if (res->ai_family == AF_INET) {
2267			ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2268			maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2269			addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2270			if (masklen < 0) {
2271				/* use default netmask */
2272				if (IN_CLASSA(ntohl(addrp->s_addr)))
2273					maskp->s_addr = htonl(IN_CLASSA_NET);
2274				else if (IN_CLASSB(ntohl(addrp->s_addr)))
2275					maskp->s_addr = htonl(IN_CLASSB_NET);
2276				else
2277					maskp->s_addr = htonl(IN_CLASSC_NET);
2278			} else if (masklen <= 32) {
2279				/* convert masklen to netmask */
2280				if (masklen == 0)
2281					maskp->s_addr = 0;
2282				else
2283					maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2284			} else {
2285				freeaddrinfo(res);
2286				return (-1);
2287			}
2288			/* Lose any host bits in the network number. */
2289			addrp->s_addr &= maskp->s_addr;
2290		}
2291#ifdef INET6
2292		else if (res->ai_family == AF_INET6 && masklen <= 128) {
2293			ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2294			if (masklen < 0)
2295				masklen = 128;
2296			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2297			/* convert masklen to netmask */
2298			while (masklen > 0) {
2299				if (masklen < 32) {
2300					*mask6p = htonl(~(0xffffffff >> masklen));
2301					break;
2302				}
2303				*mask6p++ = 0xffffffff;
2304				masklen -= 32;
2305			}
2306			/* Lose any host bits in the network number. */
2307			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2308			addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2309			for (i = 0; i < 4; i++)
2310				addr6p[i] &= mask6p[i];
2311		}
2312#endif
2313		else {
2314			freeaddrinfo(res);
2315			return (-1);
2316		}
2317		freeaddrinfo(res);
2318	} else {
2319		/* arg `s' is domain name */
2320		ap.isnumeric = 0;
2321		ap.a_name = s;
2322		if (cp1)
2323			*cp1 = '/';
2324#ifdef INET6
2325		if (cp2) {
2326			*cp2 = ']';
2327			--s;
2328		}
2329#endif
2330	}
2331
2332	if (Debug) {
2333		printf("allowaddr: rule %d: ", NumAllowed);
2334		if (ap.isnumeric) {
2335			printf("numeric, ");
2336			getnameinfo((struct sockaddr *)&ap.a_addr,
2337				    ((struct sockaddr *)&ap.a_addr)->sa_len,
2338				    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2339			printf("addr = %s, ", ip);
2340			getnameinfo((struct sockaddr *)&ap.a_mask,
2341				    ((struct sockaddr *)&ap.a_mask)->sa_len,
2342				    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2343			printf("mask = %s; ", ip);
2344		} else {
2345			printf("domainname = %s; ", ap.a_name);
2346		}
2347		printf("port = %d\n", ap.port);
2348	}
2349
2350	if ((AllowedPeers = realloc(AllowedPeers,
2351				    ++NumAllowed * sizeof(struct allowedpeer)))
2352	    == NULL) {
2353		logerror("realloc");
2354		exit(1);
2355	}
2356	memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2357	return (0);
2358}
2359
2360/*
2361 * Validate that the remote peer has permission to log to us.
2362 */
2363static int
2364validate(struct sockaddr *sa, const char *hname)
2365{
2366	int i;
2367	size_t l1, l2;
2368	char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2369	struct allowedpeer *ap;
2370	struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2371#ifdef INET6
2372	int j, reject;
2373	struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2374#endif
2375	struct addrinfo hints, *res;
2376	u_short sport;
2377
2378	if (NumAllowed == 0)
2379		/* traditional behaviour, allow everything */
2380		return (1);
2381
2382	(void)strlcpy(name, hname, sizeof(name));
2383	memset(&hints, 0, sizeof(hints));
2384	hints.ai_family = PF_UNSPEC;
2385	hints.ai_socktype = SOCK_DGRAM;
2386	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2387	if (getaddrinfo(name, NULL, &hints, &res) == 0)
2388		freeaddrinfo(res);
2389	else if (strchr(name, '.') == NULL) {
2390		strlcat(name, ".", sizeof name);
2391		strlcat(name, LocalDomain, sizeof name);
2392	}
2393	if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2394			NI_NUMERICHOST | NI_NUMERICSERV) != 0)
2395		return (0);	/* for safety, should not occur */
2396	dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2397		ip, port, name);
2398	sport = atoi(port);
2399
2400	/* now, walk down the list */
2401	for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2402		if (ap->port != 0 && ap->port != sport) {
2403			dprintf("rejected in rule %d due to port mismatch.\n", i);
2404			continue;
2405		}
2406
2407		if (ap->isnumeric) {
2408			if (ap->a_addr.ss_family != sa->sa_family) {
2409				dprintf("rejected in rule %d due to address family mismatch.\n", i);
2410				continue;
2411			}
2412			if (ap->a_addr.ss_family == AF_INET) {
2413				sin4 = (struct sockaddr_in *)sa;
2414				a4p = (struct sockaddr_in *)&ap->a_addr;
2415				m4p = (struct sockaddr_in *)&ap->a_mask;
2416				if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2417				    != a4p->sin_addr.s_addr) {
2418					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2419					continue;
2420				}
2421			}
2422#ifdef INET6
2423			else if (ap->a_addr.ss_family == AF_INET6) {
2424				sin6 = (struct sockaddr_in6 *)sa;
2425				a6p = (struct sockaddr_in6 *)&ap->a_addr;
2426				m6p = (struct sockaddr_in6 *)&ap->a_mask;
2427				if (a6p->sin6_scope_id != 0 &&
2428				    sin6->sin6_scope_id != a6p->sin6_scope_id) {
2429					dprintf("rejected in rule %d due to scope mismatch.\n", i);
2430					continue;
2431				}
2432				reject = 0;
2433				for (j = 0; j < 16; j += 4) {
2434					if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2435					    != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2436						++reject;
2437						break;
2438					}
2439				}
2440				if (reject) {
2441					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2442					continue;
2443				}
2444			}
2445#endif
2446			else
2447				continue;
2448		} else {
2449			cp = ap->a_name;
2450			l1 = strlen(name);
2451			if (*cp == '*') {
2452				/* allow wildmatch */
2453				cp++;
2454				l2 = strlen(cp);
2455				if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2456					dprintf("rejected in rule %d due to name mismatch.\n", i);
2457					continue;
2458				}
2459			} else {
2460				/* exact match */
2461				l2 = strlen(cp);
2462				if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2463					dprintf("rejected in rule %d due to name mismatch.\n", i);
2464					continue;
2465				}
2466			}
2467		}
2468		dprintf("accepted in rule %d.\n", i);
2469		return (1);	/* hooray! */
2470	}
2471	return (0);
2472}
2473
2474/*
2475 * Fairly similar to popen(3), but returns an open descriptor, as
2476 * opposed to a FILE *.
2477 */
2478static int
2479p_open(const char *prog, pid_t *rpid)
2480{
2481	int pfd[2], nulldesc;
2482	pid_t pid;
2483	sigset_t omask, mask;
2484	char *argv[4]; /* sh -c cmd NULL */
2485	char errmsg[200];
2486
2487	if (pipe(pfd) == -1)
2488		return (-1);
2489	if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2490		/* we are royally screwed anyway */
2491		return (-1);
2492
2493	sigemptyset(&mask);
2494	sigaddset(&mask, SIGALRM);
2495	sigaddset(&mask, SIGHUP);
2496	sigprocmask(SIG_BLOCK, &mask, &omask);
2497	switch ((pid = fork())) {
2498	case -1:
2499		sigprocmask(SIG_SETMASK, &omask, 0);
2500		close(nulldesc);
2501		return (-1);
2502
2503	case 0:
2504		argv[0] = strdup("sh");
2505		argv[1] = strdup("-c");
2506		argv[2] = strdup(prog);
2507		argv[3] = NULL;
2508		if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2509			logerror("strdup");
2510			exit(1);
2511		}
2512
2513		alarm(0);
2514		(void)setsid();	/* Avoid catching SIGHUPs. */
2515
2516		/*
2517		 * Throw away pending signals, and reset signal
2518		 * behaviour to standard values.
2519		 */
2520		signal(SIGALRM, SIG_IGN);
2521		signal(SIGHUP, SIG_IGN);
2522		sigprocmask(SIG_SETMASK, &omask, 0);
2523		signal(SIGPIPE, SIG_DFL);
2524		signal(SIGQUIT, SIG_DFL);
2525		signal(SIGALRM, SIG_DFL);
2526		signal(SIGHUP, SIG_DFL);
2527
2528		dup2(pfd[0], STDIN_FILENO);
2529		dup2(nulldesc, STDOUT_FILENO);
2530		dup2(nulldesc, STDERR_FILENO);
2531		closefrom(3);
2532
2533		(void)execvp(_PATH_BSHELL, argv);
2534		_exit(255);
2535	}
2536
2537	sigprocmask(SIG_SETMASK, &omask, 0);
2538	close(nulldesc);
2539	close(pfd[0]);
2540	/*
2541	 * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
2542	 * supposed to get an EWOULDBLOCK on writev(2), which is
2543	 * caught by the logic above anyway, which will in turn close
2544	 * the pipe, and fork a new logging subprocess if necessary.
2545	 * The stale subprocess will be killed some time later unless
2546	 * it terminated itself due to closing its input pipe (so we
2547	 * get rid of really dead puppies).
2548	 */
2549	if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2550		/* This is bad. */
2551		(void)snprintf(errmsg, sizeof errmsg,
2552			       "Warning: cannot change pipe to PID %d to "
2553			       "non-blocking behaviour.",
2554			       (int)pid);
2555		logerror(errmsg);
2556	}
2557	*rpid = pid;
2558	return (pfd[1]);
2559}
2560
2561static void
2562deadq_enter(pid_t pid, const char *name)
2563{
2564	dq_t p;
2565	int status;
2566
2567	/*
2568	 * Be paranoid, if we can't signal the process, don't enter it
2569	 * into the dead queue (perhaps it's already dead).  If possible,
2570	 * we try to fetch and log the child's status.
2571	 */
2572	if (kill(pid, 0) != 0) {
2573		if (waitpid(pid, &status, WNOHANG) > 0)
2574			log_deadchild(pid, status, name);
2575		return;
2576	}
2577
2578	p = malloc(sizeof(struct deadq_entry));
2579	if (p == NULL) {
2580		logerror("malloc");
2581		exit(1);
2582	}
2583
2584	p->dq_pid = pid;
2585	p->dq_timeout = DQ_TIMO_INIT;
2586	TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2587}
2588
2589static int
2590deadq_remove(pid_t pid)
2591{
2592	dq_t q;
2593
2594	TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2595		if (q->dq_pid == pid) {
2596			TAILQ_REMOVE(&deadq_head, q, dq_entries);
2597				free(q);
2598				return (1);
2599		}
2600	}
2601
2602	return (0);
2603}
2604
2605static void
2606log_deadchild(pid_t pid, int status, const char *name)
2607{
2608	int code;
2609	char buf[256];
2610	const char *reason;
2611
2612	errno = 0; /* Keep strerror() stuff out of logerror messages. */
2613	if (WIFSIGNALED(status)) {
2614		reason = "due to signal";
2615		code = WTERMSIG(status);
2616	} else {
2617		reason = "with status";
2618		code = WEXITSTATUS(status);
2619		if (code == 0)
2620			return;
2621	}
2622	(void)snprintf(buf, sizeof buf,
2623		       "Logging subprocess %d (%s) exited %s %d.",
2624		       pid, name, reason, code);
2625	logerror(buf);
2626}
2627
2628static int *
2629socksetup(int af, char *bindhostname)
2630{
2631	struct addrinfo hints, *res, *r;
2632	const char *bindservice;
2633	char *cp;
2634	int error, maxs, *s, *socks;
2635
2636	/*
2637	 * We have to handle this case for backwards compatibility:
2638	 * If there are two (or more) colons but no '[' and ']',
2639	 * assume this is an inet6 address without a service.
2640	 */
2641	bindservice = "syslog";
2642	if (bindhostname != NULL) {
2643#ifdef INET6
2644		if (*bindhostname == '[' &&
2645		    (cp = strchr(bindhostname + 1, ']')) != NULL) {
2646			++bindhostname;
2647			*cp = '\0';
2648			if (cp[1] == ':' && cp[2] != '\0')
2649				bindservice = cp + 2;
2650		} else {
2651#endif
2652			cp = strchr(bindhostname, ':');
2653			if (cp != NULL && strchr(cp + 1, ':') == NULL) {
2654				*cp = '\0';
2655				if (cp[1] != '\0')
2656					bindservice = cp + 1;
2657				if (cp == bindhostname)
2658					bindhostname = NULL;
2659			}
2660#ifdef INET6
2661		}
2662#endif
2663	}
2664
2665	memset(&hints, 0, sizeof(hints));
2666	hints.ai_flags = AI_PASSIVE;
2667	hints.ai_family = af;
2668	hints.ai_socktype = SOCK_DGRAM;
2669	error = getaddrinfo(bindhostname, bindservice, &hints, &res);
2670	if (error) {
2671		logerror(gai_strerror(error));
2672		errno = 0;
2673		die(0);
2674	}
2675
2676	/* Count max number of sockets we may open */
2677	for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2678	socks = malloc((maxs+1) * sizeof(int));
2679	if (socks == NULL) {
2680		logerror("couldn't allocate memory for sockets");
2681		die(0);
2682	}
2683
2684	*socks = 0;   /* num of sockets counter at start of array */
2685	s = socks + 1;
2686	for (r = res; r; r = r->ai_next) {
2687		int on = 1;
2688		*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2689		if (*s < 0) {
2690			logerror("socket");
2691			continue;
2692		}
2693#ifdef INET6
2694		if (r->ai_family == AF_INET6) {
2695			if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2696				       (char *)&on, sizeof (on)) < 0) {
2697				logerror("setsockopt");
2698				close(*s);
2699				continue;
2700			}
2701		}
2702#endif
2703		if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
2704			       (char *)&on, sizeof (on)) < 0) {
2705			logerror("setsockopt");
2706			close(*s);
2707			continue;
2708		}
2709		/*
2710		 * RFC 3164 recommends that client side message
2711		 * should come from the privileged syslogd port.
2712		 *
2713		 * If the system administrator choose not to obey
2714		 * this, we can skip the bind() step so that the
2715		 * system will choose a port for us.
2716		 */
2717		if (!NoBind) {
2718			if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2719				logerror("bind");
2720				close(*s);
2721				continue;
2722			}
2723
2724			if (!SecureMode)
2725				increase_rcvbuf(*s);
2726		}
2727
2728		(*socks)++;
2729		s++;
2730	}
2731
2732	if (*socks == 0) {
2733		free(socks);
2734		if (Debug)
2735			return (NULL);
2736		else
2737			die(0);
2738	}
2739	if (res)
2740		freeaddrinfo(res);
2741
2742	return (socks);
2743}
2744
2745static void
2746increase_rcvbuf(int fd)
2747{
2748	socklen_t len, slen;
2749
2750	slen = sizeof(len);
2751
2752	if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
2753		if (len < RCVBUF_MINSIZE) {
2754			len = RCVBUF_MINSIZE;
2755			setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len));
2756		}
2757	}
2758}
2759