syslogd.c revision 63795 
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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1983, 1988, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)syslogd.c	8.3 (Berkeley) 4/4/94";
43#endif
44static const char rcsid[] =
45  "$FreeBSD: head/usr.sbin/syslogd/syslogd.c 63795 2000-07-24 14:10:17Z dwmalone $";
46#endif /* not lint */
47
48/*
49 *  syslogd -- log system messages
50 *
51 * This program implements a system log. It takes a series of lines.
52 * Each line may have a priority, signified as "<n>" as
53 * the first characters of the line.  If this is
54 * not present, a default priority is used.
55 *
56 * To kill syslogd, send a signal 15 (terminate).  A signal 1 (hup) will
57 * cause it to reread its configuration file.
58 *
59 * Defined Constants:
60 *
61 * MAXLINE -- the maximimum line length that can be handled.
62 * DEFUPRI -- the default priority for user messages
63 * DEFSPRI -- the default priority for kernel messages
64 *
65 * Author: Eric Allman
66 * extensive changes by Ralph Campbell
67 * more extensive changes by Eric Allman (again)
68 * Extension to log by program name as well as facility and priority
69 *   by Peter da Silva.
70 * -u and -v by Harlan Stenn.
71 * Priority comparison code by Harlan Stenn.
72 */
73
74#define	MAXLINE		1024		/* maximum line length */
75#define	MAXSVLINE	120		/* maximum saved line length */
76#define DEFUPRI		(LOG_USER|LOG_NOTICE)
77#define DEFSPRI		(LOG_KERN|LOG_CRIT)
78#define TIMERINTVL	30		/* interval for checking flush, mark */
79#define TTYMSGTIME	1		/* timed out passed to ttymsg */
80
81#include <sys/param.h>
82#include <sys/ioctl.h>
83#include <sys/stat.h>
84#include <sys/wait.h>
85#include <sys/socket.h>
86#include <sys/queue.h>
87#include <sys/uio.h>
88#include <sys/un.h>
89#include <sys/time.h>
90#include <sys/resource.h>
91#include <sys/syslimits.h>
92#include <paths.h>
93
94#include <netinet/in.h>
95#include <netdb.h>
96#include <arpa/inet.h>
97
98#include <ctype.h>
99#include <err.h>
100#include <errno.h>
101#include <fcntl.h>
102#include <regex.h>
103#include <setjmp.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 <utmp.h>
111#include "pathnames.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#define MAXFUNIX       20
125
126int nfunix = 1;
127char *funixn[MAXFUNIX] = { _PATH_LOG };
128int funix[MAXFUNIX];
129
130/*
131 * Flags to logmsg().
132 */
133
134#define IGN_CONS	0x001	/* don't print on console */
135#define SYNC_FILE	0x002	/* do fsync on file after printing */
136#define ADDDATE		0x004	/* add a date to the message */
137#define MARK		0x008	/* this message is a mark */
138#define ISKERNEL	0x010	/* kernel generated message */
139
140/*
141 * This structure represents the files that will have log
142 * copies printed.
143 */
144
145struct filed {
146	struct	filed *f_next;		/* next in linked list */
147	short	f_type;			/* entry type, see below */
148	short	f_file;			/* file descriptor */
149	time_t	f_time;			/* time this was last written */
150	char	*f_host;		/* host from which to recd. */
151	u_char	f_pmask[LOG_NFACILITIES+1];	/* priority mask */
152	u_char	f_pcmp[LOG_NFACILITIES+1];	/* compare priority */
153#define PRI_LT	0x1
154#define PRI_EQ	0x2
155#define PRI_GT	0x4
156	char	*f_program;		/* program this applies to */
157	union {
158		char	f_uname[MAXUNAMES][UT_NAMESIZE+1];
159		struct {
160			char	f_hname[MAXHOSTNAMELEN+1];
161			struct sockaddr_in	f_addr;
162		} f_forw;		/* forwarding address */
163		char	f_fname[MAXPATHLEN];
164		struct {
165			char	f_pname[MAXPATHLEN];
166			pid_t	f_pid;
167		} f_pipe;
168	} f_un;
169	char	f_prevline[MAXSVLINE];		/* last message logged */
170	char	f_lasttime[16];			/* time of last occurrence */
171	char	f_prevhost[MAXHOSTNAMELEN+1];	/* host from which recd. */
172	int	f_prevpri;			/* pri of f_prevline */
173	int	f_prevlen;			/* length of f_prevline */
174	int	f_prevcount;			/* repetition cnt of prevline */
175	int	f_repeatcount;			/* number of "repeated" msgs */
176};
177
178/*
179 * Queue of about-to-be dead processes we should watch out for.
180 */
181
182TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
183struct stailhead *deadq_headp;
184
185struct deadq_entry {
186	pid_t				dq_pid;
187	int				dq_timeout;
188	TAILQ_ENTRY(deadq_entry)	dq_entries;
189};
190
191/*
192 * The timeout to apply to processes waiting on the dead queue.  Unit
193 * of measure is `mark intervals', i.e. 20 minutes by default.
194 * Processes on the dead queue will be terminated after that time.
195 */
196
197#define DQ_TIMO_INIT	2
198
199typedef struct deadq_entry *dq_t;
200
201
202/*
203 * Struct to hold records of network addresses that are allowed to log
204 * to us.
205 */
206struct allowedpeer {
207	int isnumeric;
208	u_short port;
209	union {
210		struct {
211			struct in_addr addr;
212			struct in_addr mask;
213		} numeric;
214		char *name;
215	} u;
216#define a_addr u.numeric.addr
217#define a_mask u.numeric.mask
218#define a_name u.name
219};
220
221
222/*
223 * Intervals at which we flush out "message repeated" messages,
224 * in seconds after previous message is logged.  After each flush,
225 * we move to the next interval until we reach the largest.
226 */
227int	repeatinterval[] = { 30, 120, 600 };	/* # of secs before flush */
228#define	MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
229#define	REPEATTIME(f)	((f)->f_time + repeatinterval[(f)->f_repeatcount])
230#define	BACKOFF(f)	{ if (++(f)->f_repeatcount > MAXREPEAT) \
231				 (f)->f_repeatcount = MAXREPEAT; \
232			}
233
234/* values for f_type */
235#define F_UNUSED	0		/* unused entry */
236#define F_FILE		1		/* regular file */
237#define F_TTY		2		/* terminal */
238#define F_CONSOLE	3		/* console terminal */
239#define F_FORW		4		/* remote machine */
240#define F_USERS		5		/* list of users */
241#define F_WALL		6		/* everyone logged on */
242#define F_PIPE		7		/* pipe to program */
243
244char	*TypeNames[8] = {
245	"UNUSED",	"FILE",		"TTY",		"CONSOLE",
246	"FORW",		"USERS",	"WALL",		"PIPE"
247};
248
249struct	filed *Files;
250struct	filed consfile;
251
252int	Debug;			/* debug flag */
253char	LocalHostName[MAXHOSTNAMELEN+1];	/* our hostname */
254char	*LocalDomain;		/* our local domain name */
255int	finet = -1;		/* Internet datagram socket */
256int	fklog = -1;		/* /dev/klog */
257int	LogPort;		/* port number for INET connections */
258int	Initialized = 0;	/* set when we have initialized ourselves */
259int	MarkInterval = 20 * 60;	/* interval between marks in seconds */
260int	MarkSeq = 0;		/* mark sequence number */
261int	SecureMode = 0;		/* when true, receive only unix domain socks */
262
263char	bootfile[MAXLINE+1];	/* booted kernel file */
264
265struct allowedpeer *AllowedPeers;
266int	NumAllowed = 0;		/* # of AllowedPeer entries */
267
268int	UniquePriority = 0;	/* Only log specified priority? */
269int	LogFacPri = 0;		/* Put facility and priority in log message: */
270				/* 0=no, 1=numeric, 2=names */
271
272int	allowaddr __P((char *));
273void	cfline __P((char *, struct filed *, char *, char *));
274char   *cvthname __P((struct sockaddr_in *));
275void	deadq_enter __P((pid_t, const char *));
276int	deadq_remove __P((pid_t));
277int	decode __P((const char *, CODE *));
278void	die __P((int));
279void	domark __P((int));
280void	fprintlog __P((struct filed *, int, char *));
281void	init __P((int));
282void	logerror __P((const char *));
283void	logmsg __P((int, char *, char *, int));
284void	log_deadchild __P((pid_t, int, const char *));
285void	printline __P((char *, char *));
286void	printsys __P((char *));
287int	p_open __P((char *, pid_t *));
288void	readklog __P((void));
289void	reapchild __P((int));
290char   *ttymsg __P((struct iovec *, int, char *, int));
291static void	usage __P((void));
292int	validate __P((struct sockaddr_in *, const char *));
293void	wallmsg __P((struct filed *, struct iovec *));
294int	waitdaemon __P((int, int, int));
295void	timedout __P((int));
296
297int
298main(argc, argv)
299	int argc;
300	char *argv[];
301{
302	int ch, i, l;
303	struct sockaddr_un sunx, fromunix;
304	struct sockaddr_in sin, frominet;
305	FILE *fp;
306	char *p, *hname, line[MAXLINE + 1];
307	struct timeval tv, *tvp;
308	struct sigaction sact;
309	sigset_t mask;
310	pid_t ppid = 1;
311	socklen_t len;
312
313	while ((ch = getopt(argc, argv, "a:dl:f:m:p:suv")) != -1)
314		switch(ch) {
315		case 'd':		/* debug */
316			Debug++;
317			break;
318		case 'a':		/* allow specific network addresses only */
319			if (allowaddr(optarg) == -1)
320				usage();
321			break;
322		case 'f':		/* configuration file */
323			ConfFile = optarg;
324			break;
325		case 'm':		/* mark interval */
326			MarkInterval = atoi(optarg) * 60;
327			break;
328		case 'p':		/* path */
329			funixn[0] = optarg;
330			break;
331		case 's':		/* no network mode */
332			SecureMode++;
333			break;
334		case 'l':
335			if (nfunix < MAXFUNIX)
336				funixn[nfunix++] = optarg;
337			else
338				warnx("out of descriptors, ignoring %s",
339					optarg);
340			break;
341		case 'u':		/* only log specified priority */
342		        UniquePriority++;
343			break;
344		case 'v':		/* log facility and priority */
345		  	LogFacPri++;
346			break;
347		case '?':
348		default:
349			usage();
350		}
351	if ((argc -= optind) != 0)
352		usage();
353
354	if (!Debug) {
355		ppid = waitdaemon(0, 0, 30);
356		if (ppid < 0)
357			err(1, "could not become daemon");
358	} else
359		setlinebuf(stdout);
360
361	if (NumAllowed)
362		endservent();
363
364	consfile.f_type = F_CONSOLE;
365	(void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1);
366	(void)gethostname(LocalHostName, sizeof(LocalHostName));
367	if ((p = strchr(LocalHostName, '.')) != NULL) {
368		*p++ = '\0';
369		LocalDomain = p;
370	} else
371		LocalDomain = "";
372	(void)strcpy(bootfile, getbootfile());
373	(void)signal(SIGTERM, die);
374	(void)signal(SIGINT, Debug ? die : SIG_IGN);
375	(void)signal(SIGQUIT, Debug ? die : SIG_IGN);
376	/*
377	 * We don't want the SIGCHLD and SIGHUP handlers to interfere
378	 * with each other; they are likely candidates for being called
379	 * simultaneously (SIGHUP closes pipe descriptor, process dies,
380	 * SIGCHLD happens).
381	 */
382	sigemptyset(&mask);
383	sigaddset(&mask, SIGHUP);
384	sact.sa_handler = reapchild;
385	sact.sa_mask = mask;
386	sact.sa_flags = SA_RESTART;
387	(void)sigaction(SIGCHLD, &sact, NULL);
388	(void)signal(SIGALRM, domark);
389	(void)signal(SIGPIPE, SIG_IGN);	/* We'll catch EPIPE instead. */
390	(void)alarm(TIMERINTVL);
391
392	TAILQ_INIT(&deadq_head);
393
394#ifndef SUN_LEN
395#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
396#endif
397	for (i = 0; i < nfunix; i++) {
398		memset(&sunx, 0, sizeof(sunx));
399		sunx.sun_family = AF_UNIX;
400		(void)strncpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path));
401		funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0);
402		if (funix[i] < 0 ||
403		    bind(funix[i], (struct sockaddr *)&sunx,
404			 SUN_LEN(&sunx)) < 0 ||
405		    chmod(funixn[i], 0666) < 0) {
406			(void) snprintf(line, sizeof line,
407					"cannot create %s", funixn[i]);
408			logerror(line);
409			dprintf("cannot create %s (%d)\n", funixn[i], errno);
410			if (i == 0)
411				die(0);
412		}
413	}
414	if (SecureMode <= 1)
415		finet = socket(AF_INET, SOCK_DGRAM, 0);
416	if (finet >= 0) {
417		struct servent *sp;
418
419		sp = getservbyname("syslog", "udp");
420		if (sp == NULL) {
421			errno = 0;
422			logerror("syslog/udp: unknown service");
423			die(0);
424		}
425		memset(&sin, 0, sizeof(sin));
426		sin.sin_family = AF_INET;
427		sin.sin_port = LogPort = sp->s_port;
428
429		if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
430			logerror("bind");
431			if (!Debug)
432				die(0);
433		}
434	}
435	if (finet >= 0 && SecureMode) {
436		if (shutdown(finet, SHUT_RD) < 0) {
437			logerror("shutdown");
438			if (!Debug)
439				die(0);
440		}
441	}
442
443	if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
444		if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
445			fklog = -1;
446	if (fklog < 0)
447		dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
448
449	/* tuck my process id away */
450	fp = fopen(PidFile, "w");
451	if (fp != NULL) {
452		fprintf(fp, "%d\n", getpid());
453		(void) fclose(fp);
454	}
455
456	dprintf("off & running....\n");
457
458	init(0);
459	/* prevent SIGHUP and SIGCHLD handlers from running in parallel */
460	sigemptyset(&mask);
461	sigaddset(&mask, SIGCHLD);
462	sact.sa_handler = init;
463	sact.sa_mask = mask;
464	sact.sa_flags = SA_RESTART;
465	(void)sigaction(SIGHUP, &sact, NULL);
466
467	tvp = &tv;
468	tv.tv_sec = tv.tv_usec = 0;
469
470	for (;;) {
471		fd_set readfds;
472		int nfds = 0;
473
474		FD_ZERO(&readfds);
475		if (fklog != -1) {
476			FD_SET(fklog, &readfds);
477			if (fklog > nfds)
478				nfds = fklog;
479		}
480		if (finet != -1 && !SecureMode) {
481			FD_SET(finet, &readfds);
482			if (finet > nfds)
483				nfds = finet;
484		}
485		for (i = 0; i < nfunix; i++) {
486			if (funix[i] != -1) {
487				FD_SET(funix[i], &readfds);
488				if (funix[i] > nfds)
489					nfds = funix[i];
490			}
491		}
492
493		/*dprintf("readfds = %#x\n", readfds);*/
494		nfds = select(nfds+1, &readfds, (fd_set *)NULL,
495			      (fd_set *)NULL, tvp);
496		if (nfds == 0) {
497			if (tvp) {
498				tvp = NULL;
499				if (ppid != 1)
500					kill(ppid, SIGALRM);
501			}
502			continue;
503		}
504		if (nfds < 0) {
505			if (errno != EINTR)
506				logerror("select");
507			continue;
508		}
509		/*dprintf("got a message (%d, %#x)\n", nfds, readfds);*/
510		if (fklog != -1 && FD_ISSET(fklog, &readfds))
511			readklog();
512		if (finet != -1 && FD_ISSET(finet, &readfds)) {
513			len = sizeof(frominet);
514			l = recvfrom(finet, line, MAXLINE, 0,
515			    (struct sockaddr *)&frominet, &len);
516			if (l > 0) {
517				line[l] = '\0';
518				hname = cvthname(&frominet);
519				if (validate(&frominet, hname))
520					printline(hname, line);
521			} else if (l < 0 && errno != EINTR)
522				logerror("recvfrom inet");
523		}
524		for (i = 0; i < nfunix; i++) {
525			if (funix[i] != -1 && FD_ISSET(funix[i], &readfds)) {
526				len = sizeof(fromunix);
527				l = recvfrom(funix[i], line, MAXLINE, 0,
528				    (struct sockaddr *)&fromunix, &len);
529				if (l > 0) {
530					line[l] = '\0';
531					printline(LocalHostName, line);
532				} else if (l < 0 && errno != EINTR)
533					logerror("recvfrom unix");
534			}
535		}
536	}
537}
538
539static void
540usage()
541{
542
543	fprintf(stderr, "%s\n%s\n%s\n",
544		"usage: syslogd [-dsuv] [-a allowed_peer] [-f config_file]",
545		"               [-m mark_interval] [-p log_socket]",
546		"               [-l log_socket]");
547	exit(1);
548}
549
550/*
551 * Take a raw input line, decode the message, and print the message
552 * on the appropriate log files.
553 */
554void
555printline(hname, msg)
556	char *hname;
557	char *msg;
558{
559	int c, pri;
560	char *p, *q, line[MAXLINE + 1];
561
562	/* test for special codes */
563	pri = DEFUPRI;
564	p = msg;
565	if (*p == '<') {
566		pri = 0;
567		while (isdigit(*++p))
568			pri = 10 * pri + (*p - '0');
569		if (*p == '>')
570			++p;
571	}
572	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
573		pri = DEFUPRI;
574
575	/* don't allow users to log kernel messages */
576	if (LOG_FAC(pri) == LOG_KERN)
577		pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
578
579	q = line;
580
581	while ((c = (unsigned char)*p++) != '\0' &&
582	    q < &line[sizeof(line) - 3]) {
583		if ((c & 0x80) && c < 0xA0) {
584			c &= 0x7F;
585			*q++ = 'M';
586			*q++ = '-';
587		}
588		if (isascii(c) && iscntrl(c)) {
589			if (c == '\n')
590				*q++ = ' ';
591			else if (c == '\t')
592				*q++ = '\t';
593			else {
594				*q++ = '^';
595				*q++ = c ^ 0100;
596			}
597		} else
598			*q++ = c;
599	}
600	*q = '\0';
601
602	logmsg(pri, line, hname, 0);
603}
604
605/*
606 * Read /dev/klog while data are available, split into lines.
607 */
608void
609readklog()
610{
611	char *p, *q, line[MAXLINE + 1];
612	int len, i;
613
614	len = 0;
615	for (;;) {
616		i = read(fklog, line + len, MAXLINE - 1 - len);
617		if (i > 0)
618			line[i + len] = '\0';
619		else if (i < 0 && errno != EINTR && errno != EAGAIN) {
620			logerror("klog");
621			fklog = -1;
622			break;
623		} else
624			break;
625
626		for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
627			*q = '\0';
628			printsys(p);
629		}
630		len = strlen(p);
631		if (len >= MAXLINE - 1) {
632			printsys(p);
633			len = 0;
634		}
635		if (len > 0)
636			memmove(line, p, len + 1);
637	}
638	if (len > 0)
639		printsys(line);
640}
641
642/*
643 * Take a raw input line from /dev/klog, format similar to syslog().
644 */
645void
646printsys(p)
647	char *p;
648{
649	int pri, flags;
650
651	flags = ISKERNEL | SYNC_FILE | ADDDATE;	/* fsync after write */
652	pri = DEFSPRI;
653	if (*p == '<') {
654		pri = 0;
655		while (isdigit(*++p))
656			pri = 10 * pri + (*p - '0');
657		if (*p == '>')
658			++p;
659	} else {
660		/* kernel printf's come out on console */
661		flags |= IGN_CONS;
662	}
663	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
664		pri = DEFSPRI;
665	logmsg(pri, p, LocalHostName, flags);
666}
667
668time_t	now;
669
670/*
671 * Log a message to the appropriate log files, users, etc. based on
672 * the priority.
673 */
674void
675logmsg(pri, msg, from, flags)
676	int pri;
677	char *msg, *from;
678	int flags;
679{
680	struct filed *f;
681	int i, fac, msglen, omask, prilev;
682	char *timestamp;
683 	char prog[NAME_MAX+1];
684	char buf[MAXLINE+1];
685
686	dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
687	    pri, flags, from, msg);
688
689	omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
690
691	/*
692	 * Check to see if msg looks non-standard.
693	 */
694	msglen = strlen(msg);
695	if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
696	    msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
697		flags |= ADDDATE;
698
699	(void)time(&now);
700	if (flags & ADDDATE)
701		timestamp = ctime(&now) + 4;
702	else {
703		timestamp = msg;
704		msg += 16;
705		msglen -= 16;
706	}
707
708	/* skip leading blanks */
709	while(isspace(*msg)) {
710		msg++;
711		msglen--;
712	}
713
714	/* extract facility and priority level */
715	if (flags & MARK)
716		fac = LOG_NFACILITIES;
717	else
718		fac = LOG_FAC(pri);
719	prilev = LOG_PRI(pri);
720
721	/* extract program name */
722	for(i = 0; i < NAME_MAX; i++) {
723		if(!isalnum(msg[i]))
724			break;
725		prog[i] = msg[i];
726	}
727	prog[i] = 0;
728
729	/* add kernel prefix for kernel messages */
730	if (flags & ISKERNEL) {
731		snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg);
732		msg = buf;
733		msglen = strlen(buf);
734	}
735
736	/* log the message to the particular outputs */
737	if (!Initialized) {
738		f = &consfile;
739		f->f_file = open(ctty, O_WRONLY, 0);
740
741		if (f->f_file >= 0) {
742			fprintlog(f, flags, msg);
743			(void)close(f->f_file);
744		}
745		(void)sigsetmask(omask);
746		return;
747	}
748	for (f = Files; f; f = f->f_next) {
749		/* skip messages that are incorrect priority */
750		if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
751		     ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
752		     ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
753		     )
754		    || f->f_pmask[fac] == INTERNAL_NOPRI)
755			continue;
756		/* skip messages with the incorrect hostname */
757		if (f->f_host)
758			switch (f->f_host[0]) {
759			case '+':
760				if((strcmp(from, f->f_host + 1) != 0) )
761					continue;
762				break;
763			case '-':
764				if((strcmp(from, f->f_host + 1) == 0) )
765					continue;
766				break;
767			}
768
769		/* skip messages with the incorrect program name */
770		if(f->f_program)
771			if(strcmp(prog, f->f_program) != 0)
772				continue;
773
774		if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
775			continue;
776
777		/* don't output marks to recently written files */
778		if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
779			continue;
780
781		/*
782		 * suppress duplicate lines to this file
783		 */
784		if ((flags & MARK) == 0 && msglen == f->f_prevlen &&
785		    !strcmp(msg, f->f_prevline) &&
786		    !strcasecmp(from, f->f_prevhost)) {
787			(void)strncpy(f->f_lasttime, timestamp, 15);
788			f->f_prevcount++;
789			dprintf("msg repeated %d times, %ld sec of %d\n",
790			    f->f_prevcount, (long)(now - f->f_time),
791			    repeatinterval[f->f_repeatcount]);
792			/*
793			 * If domark would have logged this by now,
794			 * flush it now (so we don't hold isolated messages),
795			 * but back off so we'll flush less often
796			 * in the future.
797			 */
798			if (now > REPEATTIME(f)) {
799				fprintlog(f, flags, (char *)NULL);
800				BACKOFF(f);
801			}
802		} else {
803			/* new line, save it */
804			if (f->f_prevcount)
805				fprintlog(f, 0, (char *)NULL);
806			f->f_repeatcount = 0;
807			f->f_prevpri = pri;
808			(void)strncpy(f->f_lasttime, timestamp, 15);
809			(void)strncpy(f->f_prevhost, from,
810					sizeof(f->f_prevhost)-1);
811			f->f_prevhost[sizeof(f->f_prevhost)-1] = '\0';
812			if (msglen < MAXSVLINE) {
813				f->f_prevlen = msglen;
814				(void)strcpy(f->f_prevline, msg);
815				fprintlog(f, flags, (char *)NULL);
816			} else {
817				f->f_prevline[0] = 0;
818				f->f_prevlen = 0;
819				fprintlog(f, flags, msg);
820			}
821		}
822	}
823	(void)sigsetmask(omask);
824}
825
826void
827fprintlog(f, flags, msg)
828	struct filed *f;
829	int flags;
830	char *msg;
831{
832	struct iovec iov[7];
833	struct iovec *v;
834	int l;
835	char line[MAXLINE + 1], repbuf[80], greetings[200];
836	char *msgret;
837
838	v = iov;
839	if (f->f_type == F_WALL) {
840		v->iov_base = greetings;
841		v->iov_len = snprintf(greetings, sizeof greetings,
842		    "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
843		    f->f_prevhost, ctime(&now));
844		v++;
845		v->iov_base = "";
846		v->iov_len = 0;
847		v++;
848	} else {
849		v->iov_base = f->f_lasttime;
850		v->iov_len = 15;
851		v++;
852		v->iov_base = " ";
853		v->iov_len = 1;
854		v++;
855	}
856
857	if (LogFacPri) {
858	  	static char fp_buf[30];	/* Hollow laugh */
859		int fac = f->f_prevpri & LOG_FACMASK;
860		int pri = LOG_PRI(f->f_prevpri);
861		char *f_s = 0;
862		char f_n[5];	/* Hollow laugh */
863		char *p_s = 0;
864		char p_n[5];	/* Hollow laugh */
865
866		if (LogFacPri > 1) {
867		  CODE *c;
868
869		  for (c = facilitynames; c->c_name; c++) {
870		    if (c->c_val == fac) {
871		      f_s = c->c_name;
872		      break;
873		    }
874		  }
875		  for (c = prioritynames; c->c_name; c++) {
876		    if (c->c_val == pri) {
877		      p_s = c->c_name;
878		      break;
879		    }
880		  }
881		}
882		if (!f_s) {
883		  snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
884		  f_s = f_n;
885		}
886		if (!p_s) {
887		  snprintf(p_n, sizeof p_n, "%d", pri);
888		  p_s = p_n;
889		}
890		snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
891		v->iov_base = fp_buf;
892		v->iov_len = strlen(fp_buf);
893	} else {
894	        v->iov_base="";
895		v->iov_len = 0;
896	}
897	v++;
898
899	v->iov_base = f->f_prevhost;
900	v->iov_len = strlen(v->iov_base);
901	v++;
902	v->iov_base = " ";
903	v->iov_len = 1;
904	v++;
905
906	if (msg) {
907		v->iov_base = msg;
908		v->iov_len = strlen(msg);
909	} else if (f->f_prevcount > 1) {
910		v->iov_base = repbuf;
911		v->iov_len = sprintf(repbuf, "last message repeated %d times",
912		    f->f_prevcount);
913	} else {
914		v->iov_base = f->f_prevline;
915		v->iov_len = f->f_prevlen;
916	}
917	v++;
918
919	dprintf("Logging to %s", TypeNames[f->f_type]);
920	f->f_time = now;
921
922	switch (f->f_type) {
923	case F_UNUSED:
924		dprintf("\n");
925		break;
926
927	case F_FORW:
928		dprintf(" %s\n", f->f_un.f_forw.f_hname);
929		/* check for local vs remote messages */
930		if (strcasecmp(f->f_prevhost, LocalHostName))
931			l = snprintf(line, sizeof line - 1,
932			    "<%d>%.15s Forwarded from %s: %s",
933			    f->f_prevpri, iov[0].iov_base, f->f_prevhost,
934			    iov[5].iov_base);
935		else
936			l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
937			     f->f_prevpri, iov[0].iov_base, iov[5].iov_base);
938		if (l > MAXLINE)
939			l = MAXLINE;
940		if ((finet >= 0) &&
941		     (sendto(finet, line, l, 0,
942			     (struct sockaddr *)&f->f_un.f_forw.f_addr,
943			     sizeof(f->f_un.f_forw.f_addr)) != l)) {
944			int e = errno;
945			(void)close(f->f_file);
946			f->f_type = F_UNUSED;
947			errno = e;
948			logerror("sendto");
949		}
950		break;
951
952	case F_FILE:
953		dprintf(" %s\n", f->f_un.f_fname);
954		v->iov_base = "\n";
955		v->iov_len = 1;
956		if (writev(f->f_file, iov, 7) < 0) {
957			int e = errno;
958			(void)close(f->f_file);
959			f->f_type = F_UNUSED;
960			errno = e;
961			logerror(f->f_un.f_fname);
962		} else if (flags & SYNC_FILE)
963			(void)fsync(f->f_file);
964		break;
965
966	case F_PIPE:
967		dprintf(" %s\n", f->f_un.f_pipe.f_pname);
968		v->iov_base = "\n";
969		v->iov_len = 1;
970		if (f->f_un.f_pipe.f_pid == 0) {
971			if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
972						&f->f_un.f_pipe.f_pid)) < 0) {
973				f->f_type = F_UNUSED;
974				logerror(f->f_un.f_pipe.f_pname);
975				break;
976			}
977		}
978		if (writev(f->f_file, iov, 7) < 0) {
979			int e = errno;
980			(void)close(f->f_file);
981			if (f->f_un.f_pipe.f_pid > 0)
982				deadq_enter(f->f_un.f_pipe.f_pid,
983					    f->f_un.f_pipe.f_pname);
984			f->f_un.f_pipe.f_pid = 0;
985			errno = e;
986			logerror(f->f_un.f_pipe.f_pname);
987		}
988		break;
989
990	case F_CONSOLE:
991		if (flags & IGN_CONS) {
992			dprintf(" (ignored)\n");
993			break;
994		}
995		/* FALLTHROUGH */
996
997	case F_TTY:
998		dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
999		v->iov_base = "\r\n";
1000		v->iov_len = 2;
1001
1002		errno = 0;	/* ttymsg() only sometimes returns an errno */
1003		if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) {
1004			f->f_type = F_UNUSED;
1005			logerror(msgret);
1006		}
1007		break;
1008
1009	case F_USERS:
1010	case F_WALL:
1011		dprintf("\n");
1012		v->iov_base = "\r\n";
1013		v->iov_len = 2;
1014		wallmsg(f, iov);
1015		break;
1016	}
1017	f->f_prevcount = 0;
1018}
1019
1020/*
1021 *  WALLMSG -- Write a message to the world at large
1022 *
1023 *	Write the specified message to either the entire
1024 *	world, or a list of approved users.
1025 */
1026void
1027wallmsg(f, iov)
1028	struct filed *f;
1029	struct iovec *iov;
1030{
1031	static int reenter;			/* avoid calling ourselves */
1032	FILE *uf;
1033	struct utmp ut;
1034	int i;
1035	char *p;
1036	char line[sizeof(ut.ut_line) + 1];
1037
1038	if (reenter++)
1039		return;
1040	if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1041		logerror(_PATH_UTMP);
1042		reenter = 0;
1043		return;
1044	}
1045	/* NOSTRICT */
1046	while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1047		if (ut.ut_name[0] == '\0')
1048			continue;
1049		strncpy(line, ut.ut_line, sizeof(ut.ut_line));
1050		line[sizeof(ut.ut_line)] = '\0';
1051		if (f->f_type == F_WALL) {
1052			if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) {
1053				errno = 0;	/* already in msg */
1054				logerror(p);
1055			}
1056			continue;
1057		}
1058		/* should we send the message to this user? */
1059		for (i = 0; i < MAXUNAMES; i++) {
1060			if (!f->f_un.f_uname[i][0])
1061				break;
1062			if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1063			    UT_NAMESIZE)) {
1064				if ((p = ttymsg(iov, 7, line, TTYMSGTIME))
1065								!= NULL) {
1066					errno = 0;	/* already in msg */
1067					logerror(p);
1068				}
1069				break;
1070			}
1071		}
1072	}
1073	(void)fclose(uf);
1074	reenter = 0;
1075}
1076
1077void
1078reapchild(signo)
1079	int signo;
1080{
1081	int status;
1082	pid_t pid;
1083	struct filed *f;
1084
1085	while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1086		if (!Initialized)
1087			/* Don't tell while we are initting. */
1088			continue;
1089
1090		/* First, look if it's a process from the dead queue. */
1091		if (deadq_remove(pid))
1092			goto oncemore;
1093
1094		/* Now, look in list of active processes. */
1095		for (f = Files; f; f = f->f_next)
1096			if (f->f_type == F_PIPE &&
1097			    f->f_un.f_pipe.f_pid == pid) {
1098				(void)close(f->f_file);
1099				f->f_un.f_pipe.f_pid = 0;
1100				log_deadchild(pid, status,
1101					      f->f_un.f_pipe.f_pname);
1102				break;
1103			}
1104	  oncemore:
1105		continue;
1106	}
1107}
1108
1109/*
1110 * Return a printable representation of a host address.
1111 */
1112char *
1113cvthname(f)
1114	struct sockaddr_in *f;
1115{
1116	struct hostent *hp;
1117	sigset_t omask, nmask;
1118	char *p;
1119
1120	dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr));
1121
1122	if (f->sin_family != AF_INET) {
1123		dprintf("Malformed from address\n");
1124		return ("???");
1125	}
1126	sigemptyset(&nmask);
1127	sigaddset(&nmask, SIGHUP);
1128	sigprocmask(SIG_BLOCK, &nmask, &omask);
1129	hp = gethostbyaddr((char *)&f->sin_addr,
1130	    sizeof(struct in_addr), f->sin_family);
1131	sigprocmask(SIG_SETMASK, &omask, NULL);
1132	if (hp == 0) {
1133		dprintf("Host name for your address (%s) unknown\n",
1134			inet_ntoa(f->sin_addr));
1135		return (inet_ntoa(f->sin_addr));
1136	}
1137	if ((p = strchr(hp->h_name, '.')) &&
1138	    strcasecmp(p + 1, LocalDomain) == 0)
1139		*p = '\0';
1140	return (hp->h_name);
1141}
1142
1143void
1144domark(signo)
1145	int signo;
1146{
1147	struct filed *f;
1148	dq_t q;
1149
1150	now = time((time_t *)NULL);
1151	MarkSeq += TIMERINTVL;
1152	if (MarkSeq >= MarkInterval) {
1153		logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK);
1154		MarkSeq = 0;
1155	}
1156
1157	for (f = Files; f; f = f->f_next) {
1158		if (f->f_prevcount && now >= REPEATTIME(f)) {
1159			dprintf("flush %s: repeated %d times, %d sec.\n",
1160			    TypeNames[f->f_type], f->f_prevcount,
1161			    repeatinterval[f->f_repeatcount]);
1162			fprintlog(f, 0, (char *)NULL);
1163			BACKOFF(f);
1164		}
1165	}
1166
1167	/* Walk the dead queue, and see if we should signal somebody. */
1168	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
1169		switch (q->dq_timeout) {
1170		case 0:
1171			/* Already signalled once, try harder now. */
1172			if (kill(q->dq_pid, SIGKILL) != 0)
1173				(void)deadq_remove(q->dq_pid);
1174			break;
1175
1176		case 1:
1177			/*
1178			 * Timed out on dead queue, send terminate
1179			 * signal.  Note that we leave the removal
1180			 * from the dead queue to reapchild(), which
1181			 * will also log the event (unless the process
1182			 * didn't even really exist, in case we simply
1183			 * drop it from the dead queue).
1184			 */
1185			if (kill(q->dq_pid, SIGTERM) != 0)
1186				(void)deadq_remove(q->dq_pid);
1187			/* FALLTHROUGH */
1188
1189		default:
1190			q->dq_timeout--;
1191		}
1192
1193	(void)alarm(TIMERINTVL);
1194}
1195
1196/*
1197 * Print syslogd errors some place.
1198 */
1199void
1200logerror(type)
1201	const char *type;
1202{
1203	char buf[512];
1204
1205	if (errno)
1206		(void)snprintf(buf,
1207		    sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1208	else
1209		(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1210	errno = 0;
1211	dprintf("%s\n", buf);
1212	logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1213}
1214
1215void
1216die(signo)
1217	int signo;
1218{
1219	struct filed *f;
1220	int was_initialized;
1221	char buf[100];
1222	int i;
1223
1224	was_initialized = Initialized;
1225	Initialized = 0;	/* Don't log SIGCHLDs. */
1226	for (f = Files; f != NULL; f = f->f_next) {
1227		/* flush any pending output */
1228		if (f->f_prevcount)
1229			fprintlog(f, 0, (char *)NULL);
1230		if (f->f_type == F_PIPE)
1231			(void)close(f->f_file);
1232	}
1233	Initialized = was_initialized;
1234	if (signo) {
1235		dprintf("syslogd: exiting on signal %d\n", signo);
1236		(void)sprintf(buf, "exiting on signal %d", signo);
1237		errno = 0;
1238		logerror(buf);
1239	}
1240	for (i = 0; i < nfunix; i++)
1241		if (funixn[i] && funix[i] != -1)
1242			(void)unlink(funixn[i]);
1243	exit(1);
1244}
1245
1246/*
1247 *  INIT -- Initialize syslogd from configuration table
1248 */
1249void
1250init(signo)
1251	int signo;
1252{
1253	int i;
1254	FILE *cf;
1255	struct filed *f, *next, **nextp;
1256	char *p;
1257	char cline[LINE_MAX];
1258 	char prog[NAME_MAX+1];
1259	char host[MAXHOSTNAMELEN+1];
1260
1261	dprintf("init\n");
1262
1263	/*
1264	 *  Close all open log files.
1265	 */
1266	Initialized = 0;
1267	for (f = Files; f != NULL; f = next) {
1268		/* flush any pending output */
1269		if (f->f_prevcount)
1270			fprintlog(f, 0, (char *)NULL);
1271
1272		switch (f->f_type) {
1273		case F_FILE:
1274		case F_FORW:
1275		case F_CONSOLE:
1276		case F_TTY:
1277			(void)close(f->f_file);
1278			break;
1279		case F_PIPE:
1280			(void)close(f->f_file);
1281			if (f->f_un.f_pipe.f_pid > 0)
1282				deadq_enter(f->f_un.f_pipe.f_pid,
1283					    f->f_un.f_pipe.f_pname);
1284			f->f_un.f_pipe.f_pid = 0;
1285			break;
1286		}
1287		next = f->f_next;
1288		if(f->f_program) free(f->f_program);
1289		if (f->f_host) free(f->f_host);
1290		free((char *)f);
1291	}
1292	Files = NULL;
1293	nextp = &Files;
1294
1295	/* open the configuration file */
1296	if ((cf = fopen(ConfFile, "r")) == NULL) {
1297		dprintf("cannot open %s\n", ConfFile);
1298		*nextp = (struct filed *)calloc(1, sizeof(*f));
1299		cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1300		(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1301		cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1302		Initialized = 1;
1303		return;
1304	}
1305
1306	/*
1307	 *  Foreach line in the conf table, open that file.
1308	 */
1309	f = NULL;
1310	strcpy(host, "*");
1311	strcpy(prog, "*");
1312	while (fgets(cline, sizeof(cline), cf) != NULL) {
1313		/*
1314		 * check for end-of-section, comments, strip off trailing
1315		 * spaces and newline character. #!prog is treated specially:
1316		 * following lines apply only to that program.
1317		 */
1318		for (p = cline; isspace(*p); ++p)
1319			continue;
1320		if (*p == 0)
1321			continue;
1322		if(*p == '#') {
1323			p++;
1324			if (*p != '!' && *p != '+' && *p != '-')
1325				continue;
1326		}
1327		if (*p == '+' || *p == '-') {
1328			host[0] = *p++;
1329			while (isspace(*p)) p++;
1330			if ((!*p) || (*p == '*')) {
1331				strcpy(host, "*");
1332				continue;
1333			}
1334			if (*p == '@')
1335				p = LocalHostName;
1336			for (i = 1; i < MAXHOSTNAMELEN; i++) {
1337				if (!isalnum(*p) && *p != '.' && *p != '-')
1338					break;
1339				host[i] = *p++;
1340			}
1341			host[i] = '\0';
1342			continue;
1343		}
1344		if(*p=='!') {
1345			p++;
1346			while(isspace(*p)) p++;
1347			if((!*p) || (*p == '*')) {
1348				strcpy(prog, "*");
1349				continue;
1350			}
1351			for(i = 0; i < NAME_MAX; i++) {
1352				if(!isalnum(p[i]))
1353					break;
1354				prog[i] = p[i];
1355			}
1356			prog[i] = 0;
1357			continue;
1358		}
1359		for (p = strchr(cline, '\0'); isspace(*--p);)
1360			continue;
1361		*++p = '\0';
1362		f = (struct filed *)calloc(1, sizeof(*f));
1363		*nextp = f;
1364		nextp = &f->f_next;
1365		cfline(cline, f, prog, host);
1366	}
1367
1368	/* close the configuration file */
1369	(void)fclose(cf);
1370
1371	Initialized = 1;
1372
1373	if (Debug) {
1374		for (f = Files; f; f = f->f_next) {
1375			for (i = 0; i <= LOG_NFACILITIES; i++)
1376				if (f->f_pmask[i] == INTERNAL_NOPRI)
1377					printf("X ");
1378				else
1379					printf("%d ", f->f_pmask[i]);
1380			printf("%s: ", TypeNames[f->f_type]);
1381			switch (f->f_type) {
1382			case F_FILE:
1383				printf("%s", f->f_un.f_fname);
1384				break;
1385
1386			case F_CONSOLE:
1387			case F_TTY:
1388				printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1389				break;
1390
1391			case F_FORW:
1392				printf("%s", f->f_un.f_forw.f_hname);
1393				break;
1394
1395			case F_PIPE:
1396				printf("%s", f->f_un.f_pipe.f_pname);
1397				break;
1398
1399			case F_USERS:
1400				for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1401					printf("%s, ", f->f_un.f_uname[i]);
1402				break;
1403			}
1404			if(f->f_program) {
1405				printf(" (%s)", f->f_program);
1406			}
1407			printf("\n");
1408		}
1409	}
1410
1411	logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1412	dprintf("syslogd: restarted\n");
1413}
1414
1415/*
1416 * Crack a configuration file line
1417 */
1418void
1419cfline(line, f, prog, host)
1420	char *line;
1421	struct filed *f;
1422	char *prog;
1423	char *host;
1424{
1425	struct hostent *hp;
1426	int i, pri;
1427	char *bp, *p, *q;
1428	char buf[MAXLINE], ebuf[100];
1429
1430	dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1431
1432	errno = 0;	/* keep strerror() stuff out of logerror messages */
1433
1434	/* clear out file entry */
1435	memset(f, 0, sizeof(*f));
1436	for (i = 0; i <= LOG_NFACILITIES; i++)
1437		f->f_pmask[i] = INTERNAL_NOPRI;
1438
1439	/* save hostname if any */
1440	if (host && *host == '*') host = NULL;
1441	if (host) {
1442		f->f_host = calloc(1, strlen(host)+1);
1443		if (f->f_host) {
1444			strcpy(f->f_host, host);
1445		}
1446	}
1447
1448	/* save program name if any */
1449	if(prog && *prog=='*') prog = NULL;
1450	if(prog) {
1451		f->f_program = calloc(1, strlen(prog)+1);
1452		if(f->f_program) {
1453			strcpy(f->f_program, prog);
1454		}
1455	}
1456
1457	/* scan through the list of selectors */
1458	for (p = line; *p && *p != '\t' && *p != ' ';) {
1459		int pri_done;
1460		int pri_cmp;
1461
1462		/* find the end of this facility name list */
1463		for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1464			continue;
1465
1466		/* get the priority comparison */
1467		pri_cmp = 0;
1468		pri_done = 0;
1469		while (!pri_done) {
1470			switch (*q) {
1471			case '<':
1472				pri_cmp |= PRI_LT;
1473				q++;
1474				break;
1475			case '=':
1476				pri_cmp |= PRI_EQ;
1477				q++;
1478				break;
1479			case '>':
1480				pri_cmp |= PRI_GT;
1481				q++;
1482				break;
1483			default:
1484				pri_done++;
1485				break;
1486			}
1487		}
1488		if (!pri_cmp)
1489			pri_cmp = (UniquePriority)
1490				  ? (PRI_EQ)
1491				  : (PRI_EQ | PRI_GT)
1492				  ;
1493
1494		/* collect priority name */
1495		for (bp = buf; *q && !strchr("\t,; ", *q); )
1496			*bp++ = *q++;
1497		*bp = '\0';
1498
1499		/* skip cruft */
1500		while (strchr(",;", *q))
1501			q++;
1502
1503		/* decode priority name */
1504		if (*buf == '*')
1505			pri = LOG_PRIMASK + 1;
1506		else {
1507			pri = decode(buf, prioritynames);
1508			if (pri < 0) {
1509				(void)snprintf(ebuf, sizeof ebuf,
1510				    "unknown priority name \"%s\"", buf);
1511				logerror(ebuf);
1512				return;
1513			}
1514		}
1515
1516		/* scan facilities */
1517		while (*p && !strchr("\t.; ", *p)) {
1518			for (bp = buf; *p && !strchr("\t,;. ", *p); )
1519				*bp++ = *p++;
1520			*bp = '\0';
1521
1522			if (*buf == '*')
1523				for (i = 0; i < LOG_NFACILITIES; i++) {
1524					f->f_pmask[i] = pri;
1525					f->f_pcmp[i] = pri_cmp;
1526				}
1527			else {
1528				i = decode(buf, facilitynames);
1529				if (i < 0) {
1530					(void)snprintf(ebuf, sizeof ebuf,
1531					    "unknown facility name \"%s\"",
1532					    buf);
1533					logerror(ebuf);
1534					return;
1535				}
1536				f->f_pmask[i >> 3] = pri;
1537				f->f_pcmp[i >> 3] = pri_cmp;
1538			}
1539			while (*p == ',' || *p == ' ')
1540				p++;
1541		}
1542
1543		p = q;
1544	}
1545
1546	/* skip to action part */
1547	while (*p == '\t' || *p == ' ')
1548		p++;
1549
1550	switch (*p)
1551	{
1552	case '@':
1553		(void)strncpy(f->f_un.f_forw.f_hname, ++p,
1554			sizeof(f->f_un.f_forw.f_hname)-1);
1555		f->f_un.f_forw.f_hname[sizeof(f->f_un.f_forw.f_hname)-1] = '\0';
1556		hp = gethostbyname(f->f_un.f_forw.f_hname);
1557		if (hp == NULL) {
1558			extern int h_errno;
1559
1560			logerror(hstrerror(h_errno));
1561			break;
1562		}
1563		memset(&f->f_un.f_forw.f_addr, 0,
1564			 sizeof(f->f_un.f_forw.f_addr));
1565		f->f_un.f_forw.f_addr.sin_family = AF_INET;
1566		f->f_un.f_forw.f_addr.sin_port = LogPort;
1567		memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length);
1568		f->f_type = F_FORW;
1569		break;
1570
1571	case '/':
1572		if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
1573			f->f_type = F_UNUSED;
1574			logerror(p);
1575			break;
1576		}
1577		if (isatty(f->f_file)) {
1578			if (strcmp(p, ctty) == 0)
1579				f->f_type = F_CONSOLE;
1580			else
1581				f->f_type = F_TTY;
1582			(void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1);
1583		} else {
1584			(void)strcpy(f->f_un.f_fname, p);
1585			f->f_type = F_FILE;
1586		}
1587		break;
1588
1589	case '|':
1590		f->f_un.f_pipe.f_pid = 0;
1591		(void)strcpy(f->f_un.f_pipe.f_pname, p + 1);
1592		f->f_type = F_PIPE;
1593		break;
1594
1595	case '*':
1596		f->f_type = F_WALL;
1597		break;
1598
1599	default:
1600		for (i = 0; i < MAXUNAMES && *p; i++) {
1601			for (q = p; *q && *q != ','; )
1602				q++;
1603			(void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
1604			if ((q - p) > UT_NAMESIZE)
1605				f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
1606			else
1607				f->f_un.f_uname[i][q - p] = '\0';
1608			while (*q == ',' || *q == ' ')
1609				q++;
1610			p = q;
1611		}
1612		f->f_type = F_USERS;
1613		break;
1614	}
1615}
1616
1617
1618/*
1619 *  Decode a symbolic name to a numeric value
1620 */
1621int
1622decode(name, codetab)
1623	const char *name;
1624	CODE *codetab;
1625{
1626	CODE *c;
1627	char *p, buf[40];
1628
1629	if (isdigit(*name))
1630		return (atoi(name));
1631
1632	for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
1633		if (isupper(*name))
1634			*p = tolower(*name);
1635		else
1636			*p = *name;
1637	}
1638	*p = '\0';
1639	for (c = codetab; c->c_name; c++)
1640		if (!strcmp(buf, c->c_name))
1641			return (c->c_val);
1642
1643	return (-1);
1644}
1645
1646/*
1647 * fork off and become a daemon, but wait for the child to come online
1648 * before returing to the parent, or we get disk thrashing at boot etc.
1649 * Set a timer so we don't hang forever if it wedges.
1650 */
1651int
1652waitdaemon(nochdir, noclose, maxwait)
1653	int nochdir, noclose, maxwait;
1654{
1655	int fd;
1656	int status;
1657	pid_t pid, childpid;
1658
1659	switch (childpid = fork()) {
1660	case -1:
1661		return (-1);
1662	case 0:
1663		break;
1664	default:
1665		signal(SIGALRM, timedout);
1666		alarm(maxwait);
1667		while ((pid = wait3(&status, 0, NULL)) != -1) {
1668			if (WIFEXITED(status))
1669				errx(1, "child pid %d exited with return code %d",
1670					pid, WEXITSTATUS(status));
1671			if (WIFSIGNALED(status))
1672				errx(1, "child pid %d exited on signal %d%s",
1673					pid, WTERMSIG(status),
1674					WCOREDUMP(status) ? " (core dumped)" :
1675					"");
1676			if (pid == childpid)	/* it's gone... */
1677				break;
1678		}
1679		exit(0);
1680	}
1681
1682	if (setsid() == -1)
1683		return (-1);
1684
1685	if (!nochdir)
1686		(void)chdir("/");
1687
1688	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1689		(void)dup2(fd, STDIN_FILENO);
1690		(void)dup2(fd, STDOUT_FILENO);
1691		(void)dup2(fd, STDERR_FILENO);
1692		if (fd > 2)
1693			(void)close (fd);
1694	}
1695	return (getppid());
1696}
1697
1698/*
1699 * We get a SIGALRM from the child when it's running and finished doing it's
1700 * fsync()'s or O_SYNC writes for all the boot messages.
1701 *
1702 * We also get a signal from the kernel if the timer expires, so check to
1703 * see what happened.
1704 */
1705void
1706timedout(sig)
1707	int sig __unused;
1708{
1709	int left;
1710	left = alarm(0);
1711	signal(SIGALRM, SIG_DFL);
1712	if (left == 0)
1713		errx(1, "timed out waiting for child");
1714	else
1715		exit(0);
1716}
1717
1718/*
1719 * Add `s' to the list of allowable peer addresses to accept messages
1720 * from.
1721 *
1722 * `s' is a string in the form:
1723 *
1724 *    [*]domainname[:{servicename|portnumber|*}]
1725 *
1726 * or
1727 *
1728 *    netaddr/maskbits[:{servicename|portnumber|*}]
1729 *
1730 * Returns -1 on error, 0 if the argument was valid.
1731 */
1732int
1733allowaddr(s)
1734	char *s;
1735{
1736	char *cp1, *cp2;
1737	struct allowedpeer ap;
1738	struct servent *se;
1739	regex_t re;
1740	int i;
1741
1742	if ((cp1 = strrchr(s, ':'))) {
1743		/* service/port provided */
1744		*cp1++ = '\0';
1745		if (strlen(cp1) == 1 && *cp1 == '*')
1746			/* any port allowed */
1747			ap.port = htons(0);
1748		else if ((se = getservbyname(cp1, "udp")))
1749			ap.port = se->s_port;
1750		else {
1751			ap.port = htons((int)strtol(cp1, &cp2, 0));
1752			if (*cp2 != '\0')
1753				return -1; /* port not numeric */
1754		}
1755	} else {
1756		if ((se = getservbyname("syslog", "udp")))
1757			ap.port = se->s_port;
1758		else
1759			/* sanity, should not happen */
1760			ap.port = htons(514);
1761	}
1762
1763	/* the regexp's are ugly, but the cleanest way */
1764
1765	if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$",
1766		    REG_EXTENDED))
1767		/* if RE compilation fails, that's an internal error */
1768		abort();
1769	if (regexec(&re, s, 0, 0, 0) == 0) {
1770		/* arg `s' is numeric */
1771		ap.isnumeric = 1;
1772		if ((cp1 = strchr(s, '/')) != NULL) {
1773			*cp1++ = '\0';
1774			i = atoi(cp1);
1775			if (i < 0 || i > 32)
1776				return -1;
1777			/* convert masklen to netmask */
1778			ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1));
1779		}
1780		if (ascii2addr(AF_INET, s, &ap.a_addr) == -1)
1781			return -1;
1782		if (cp1 == NULL) {
1783			/* use default netmask */
1784			if (IN_CLASSA(ntohl(ap.a_addr.s_addr)))
1785				ap.a_mask.s_addr = htonl(IN_CLASSA_NET);
1786			else if (IN_CLASSB(ntohl(ap.a_addr.s_addr)))
1787				ap.a_mask.s_addr = htonl(IN_CLASSB_NET);
1788			else
1789				ap.a_mask.s_addr = htonl(IN_CLASSC_NET);
1790		}
1791	} else {
1792		/* arg `s' is domain name */
1793		ap.isnumeric = 0;
1794		ap.a_name = s;
1795	}
1796	regfree(&re);
1797
1798	if (Debug) {
1799		printf("allowaddr: rule %d: ", NumAllowed);
1800		if (ap.isnumeric) {
1801			printf("numeric, ");
1802			printf("addr = %s, ",
1803			       addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0));
1804			printf("mask = %s; ",
1805			       addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0));
1806		} else
1807			printf("domainname = %s; ", ap.a_name);
1808		printf("port = %d\n", ntohs(ap.port));
1809	}
1810
1811	if ((AllowedPeers = realloc(AllowedPeers,
1812				    ++NumAllowed * sizeof(struct allowedpeer)))
1813	    == NULL) {
1814		fprintf(stderr, "Out of memory!\n");
1815		exit(EX_OSERR);
1816	}
1817	memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
1818	return 0;
1819}
1820
1821/*
1822 * Validate that the remote peer has permission to log to us.
1823 */
1824int
1825validate(sin, hname)
1826	struct sockaddr_in *sin;
1827	const char *hname;
1828{
1829	int i;
1830	size_t l1, l2;
1831	char *cp, name[MAXHOSTNAMELEN];
1832	struct allowedpeer *ap;
1833
1834	if (NumAllowed == 0)
1835		/* traditional behaviour, allow everything */
1836		return 1;
1837
1838	strlcpy(name, hname, sizeof name);
1839	if (strchr(name, '.') == NULL) {
1840		strlcat(name, ".", sizeof name);
1841		strlcat(name, LocalDomain, sizeof name);
1842	}
1843	dprintf("validate: dgram from IP %s, port %d, name %s;\n",
1844		addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0),
1845		ntohs(sin->sin_port), name);
1846
1847	/* now, walk down the list */
1848	for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
1849		if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) {
1850			dprintf("rejected in rule %d due to port mismatch.\n", i);
1851			continue;
1852		}
1853
1854		if (ap->isnumeric) {
1855			if ((sin->sin_addr.s_addr & ap->a_mask.s_addr)
1856			    != ap->a_addr.s_addr) {
1857				dprintf("rejected in rule %d due to IP mismatch.\n", i);
1858				continue;
1859			}
1860		} else {
1861			cp = ap->a_name;
1862			l1 = strlen(name);
1863			if (*cp == '*') {
1864				/* allow wildmatch */
1865				cp++;
1866				l2 = strlen(cp);
1867				if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
1868					dprintf("rejected in rule %d due to name mismatch.\n", i);
1869					continue;
1870				}
1871			} else {
1872				/* exact match */
1873				l2 = strlen(cp);
1874				if (l2 != l1 || memcmp(cp, name, l1) != 0) {
1875					dprintf("rejected in rule %d due to name mismatch.\n", i);
1876					continue;
1877				}
1878			}
1879		}
1880		dprintf("accepted in rule %d.\n", i);
1881		return 1;	/* hooray! */
1882	}
1883	return 0;
1884}
1885
1886/*
1887 * Fairly similar to popen(3), but returns an open descriptor, as
1888 * opposed to a FILE *.
1889 */
1890int
1891p_open(prog, pid)
1892	char *prog;
1893	pid_t *pid;
1894{
1895	int pfd[2], nulldesc, i;
1896	sigset_t omask, mask;
1897	char *argv[4]; /* sh -c cmd NULL */
1898	char errmsg[200];
1899
1900	if (pipe(pfd) == -1)
1901		return -1;
1902	if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
1903		/* we are royally screwed anyway */
1904		return -1;
1905
1906	sigemptyset(&mask);
1907	sigaddset(&mask, SIGALRM);
1908	sigaddset(&mask, SIGHUP);
1909	sigprocmask(SIG_BLOCK, &mask, &omask);
1910	switch ((*pid = fork())) {
1911	case -1:
1912		sigprocmask(SIG_SETMASK, &omask, 0);
1913		close(nulldesc);
1914		return -1;
1915
1916	case 0:
1917		argv[0] = "sh";
1918		argv[1] = "-c";
1919		argv[2] = prog;
1920		argv[3] = NULL;
1921
1922		alarm(0);
1923		(void)setsid();	/* Avoid catching SIGHUPs. */
1924
1925		/*
1926		 * Throw away pending signals, and reset signal
1927		 * behaviour to standard values.
1928		 */
1929		signal(SIGALRM, SIG_IGN);
1930		signal(SIGHUP, SIG_IGN);
1931		sigprocmask(SIG_SETMASK, &omask, 0);
1932		signal(SIGPIPE, SIG_DFL);
1933		signal(SIGQUIT, SIG_DFL);
1934		signal(SIGALRM, SIG_DFL);
1935		signal(SIGHUP, SIG_DFL);
1936
1937		dup2(pfd[0], STDIN_FILENO);
1938		dup2(nulldesc, STDOUT_FILENO);
1939		dup2(nulldesc, STDERR_FILENO);
1940		for (i = getdtablesize(); i > 2; i--)
1941			(void) close(i);
1942
1943		(void) execvp(_PATH_BSHELL, argv);
1944		_exit(255);
1945	}
1946
1947	sigprocmask(SIG_SETMASK, &omask, 0);
1948	close(nulldesc);
1949	close(pfd[0]);
1950	/*
1951	 * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
1952	 * supposed to get an EWOULDBLOCK on writev(2), which is
1953	 * caught by the logic above anyway, which will in turn close
1954	 * the pipe, and fork a new logging subprocess if necessary.
1955	 * The stale subprocess will be killed some time later unless
1956	 * it terminated itself due to closing its input pipe (so we
1957	 * get rid of really dead puppies).
1958	 */
1959	if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
1960		/* This is bad. */
1961		(void)snprintf(errmsg, sizeof errmsg,
1962			       "Warning: cannot change pipe to PID %d to "
1963			       "non-blocking behaviour.",
1964			       (int)*pid);
1965		logerror(errmsg);
1966	}
1967	return pfd[1];
1968}
1969
1970void
1971deadq_enter(pid, name)
1972	pid_t pid;
1973	const char *name;
1974{
1975	dq_t p;
1976	int status;
1977
1978	/*
1979	 * Be paranoid, if we can't signal the process, don't enter it
1980	 * into the dead queue (perhaps it's already dead).  If possible,
1981	 * we try to fetch and log the child's status.
1982	 */
1983	if (kill(pid, 0) != 0) {
1984		if (waitpid(pid, &status, WNOHANG) > 0)
1985			log_deadchild(pid, status, name);
1986		return;
1987	}
1988
1989	p = malloc(sizeof(struct deadq_entry));
1990	if (p == 0) {
1991		errno = 0;
1992		logerror("panic: out of virtual memory!");
1993		exit(1);
1994	}
1995
1996	p->dq_pid = pid;
1997	p->dq_timeout = DQ_TIMO_INIT;
1998	TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
1999}
2000
2001int
2002deadq_remove(pid)
2003	pid_t pid;
2004{
2005	dq_t q;
2006
2007	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
2008		if (q->dq_pid == pid) {
2009			TAILQ_REMOVE(&deadq_head, q, dq_entries);
2010				free(q);
2011				return 1;
2012		}
2013
2014	return 0;
2015}
2016
2017void
2018log_deadchild(pid, status, name)
2019	pid_t pid;
2020	int status;
2021	const char *name;
2022{
2023	int code;
2024	char buf[256];
2025	const char *reason;
2026
2027	errno = 0; /* Keep strerror() stuff out of logerror messages. */
2028	if (WIFSIGNALED(status)) {
2029		reason = "due to signal";
2030		code = WTERMSIG(status);
2031	} else {
2032		reason = "with status";
2033		code = WEXITSTATUS(status);
2034		if (code == 0)
2035			return;
2036	}
2037	(void)snprintf(buf, sizeof buf,
2038		       "Logging subprocess %d (%s) exited %s %d.",
2039		       pid, name, reason, code);
2040	logerror(buf);
2041}
2042