syslogd.c revision 57609 
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 57609 2000-02-29 08:02:29Z joerg $";
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	u_char	f_pmask[LOG_NFACILITIES+1];	/* priority mask */
151	u_char	f_pcmp[LOG_NFACILITIES+1];	/* compare priority */
152#define PRI_LT	0x1
153#define PRI_EQ	0x2
154#define PRI_GT	0x4
155	char	*f_program;		/* program this applies to */
156	union {
157		char	f_uname[MAXUNAMES][UT_NAMESIZE+1];
158		struct {
159			char	f_hname[MAXHOSTNAMELEN+1];
160			struct sockaddr_in	f_addr;
161		} f_forw;		/* forwarding address */
162		char	f_fname[MAXPATHLEN];
163		struct {
164			char	f_pname[MAXPATHLEN];
165			pid_t	f_pid;
166		} f_pipe;
167	} f_un;
168	char	f_prevline[MAXSVLINE];		/* last message logged */
169	char	f_lasttime[16];			/* time of last occurrence */
170	char	f_prevhost[MAXHOSTNAMELEN+1];	/* host from which recd. */
171	int	f_prevpri;			/* pri of f_prevline */
172	int	f_prevlen;			/* length of f_prevline */
173	int	f_prevcount;			/* repetition cnt of prevline */
174	int	f_repeatcount;			/* number of "repeated" msgs */
175};
176
177/*
178 * Queue of about-to-be dead processes we should watch out for.
179 */
180
181TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
182struct stailhead *deadq_headp;
183
184struct deadq_entry {
185	pid_t				dq_pid;
186	int				dq_timeout;
187	TAILQ_ENTRY(deadq_entry)	dq_entries;
188};
189
190/*
191 * The timeout to apply to processes waiting on the dead queue.  Unit
192 * of measure is `mark intervals', i.e. 20 minutes by default.
193 * Processes on the dead queue will be terminated after that time.
194 */
195
196#define DQ_TIMO_INIT	2
197
198typedef struct deadq_entry *dq_t;
199
200
201/*
202 * Struct to hold records of network addresses that are allowed to log
203 * to us.
204 */
205struct allowedpeer {
206	int isnumeric;
207	u_short port;
208	union {
209		struct {
210			struct in_addr addr;
211			struct in_addr mask;
212		} numeric;
213		char *name;
214	} u;
215#define a_addr u.numeric.addr
216#define a_mask u.numeric.mask
217#define a_name u.name
218};
219
220
221/*
222 * Intervals at which we flush out "message repeated" messages,
223 * in seconds after previous message is logged.  After each flush,
224 * we move to the next interval until we reach the largest.
225 */
226int	repeatinterval[] = { 30, 120, 600 };	/* # of secs before flush */
227#define	MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
228#define	REPEATTIME(f)	((f)->f_time + repeatinterval[(f)->f_repeatcount])
229#define	BACKOFF(f)	{ if (++(f)->f_repeatcount > MAXREPEAT) \
230				 (f)->f_repeatcount = MAXREPEAT; \
231			}
232
233/* values for f_type */
234#define F_UNUSED	0		/* unused entry */
235#define F_FILE		1		/* regular file */
236#define F_TTY		2		/* terminal */
237#define F_CONSOLE	3		/* console terminal */
238#define F_FORW		4		/* remote machine */
239#define F_USERS		5		/* list of users */
240#define F_WALL		6		/* everyone logged on */
241#define F_PIPE		7		/* pipe to program */
242
243char	*TypeNames[8] = {
244	"UNUSED",	"FILE",		"TTY",		"CONSOLE",
245	"FORW",		"USERS",	"WALL",		"PIPE"
246};
247
248struct	filed *Files;
249struct	filed consfile;
250
251int	Debug;			/* debug flag */
252char	LocalHostName[MAXHOSTNAMELEN+1];	/* our hostname */
253char	*LocalDomain;		/* our local domain name */
254int	finet = -1;		/* Internet datagram socket */
255int	fklog = -1;		/* /dev/klog */
256int	LogPort;		/* port number for INET connections */
257int	Initialized = 0;	/* set when we have initialized ourselves */
258int	MarkInterval = 20 * 60;	/* interval between marks in seconds */
259int	MarkSeq = 0;		/* mark sequence number */
260int	SecureMode = 0;		/* when true, receive only unix domain socks */
261
262char	bootfile[MAXLINE+1];	/* booted kernel file */
263
264struct allowedpeer *AllowedPeers;
265int	NumAllowed = 0;		/* # of AllowedPeer entries */
266
267int	UniquePriority = 0;	/* Only log specified priority? */
268int	LogFacPri = 0;		/* Put facility and priority in log message: */
269				/* 0=no, 1=numeric, 2=names */
270
271int	allowaddr __P((char *));
272void	cfline __P((char *, struct filed *, char *));
273char   *cvthname __P((struct sockaddr_in *));
274void	deadq_enter __P((pid_t, const char *));
275int	deadq_remove __P((pid_t));
276int	decode __P((const char *, CODE *));
277void	die __P((int));
278void	domark __P((int));
279void	fprintlog __P((struct filed *, int, char *));
280void	init __P((int));
281void	logerror __P((const char *));
282void	logmsg __P((int, char *, char *, int));
283void	log_deadchild __P((pid_t, int, const char *));
284void	printline __P((char *, char *));
285void	printsys __P((char *));
286int	p_open __P((char *, pid_t *));
287void	readklog __P((void));
288void	reapchild __P((int));
289char   *ttymsg __P((struct iovec *, int, char *, int));
290static void	usage __P((void));
291int	validate __P((struct sockaddr_in *, const char *));
292void	wallmsg __P((struct filed *, struct iovec *));
293int	waitdaemon __P((int, int, int));
294void	timedout __P((int));
295
296int
297main(argc, argv)
298	int argc;
299	char *argv[];
300{
301	int ch, i, l;
302	struct sockaddr_un sunx, fromunix;
303	struct sockaddr_in sin, frominet;
304	FILE *fp;
305	char *p, *hname, line[MAXLINE + 1];
306	struct timeval tv, *tvp;
307	struct sigaction sact;
308	sigset_t mask;
309	pid_t ppid = 1;
310	socklen_t len;
311
312	while ((ch = getopt(argc, argv, "a:dl:f:m:p:suv")) != -1)
313		switch(ch) {
314		case 'd':		/* debug */
315			Debug++;
316			break;
317		case 'a':		/* allow specific network addresses only */
318			if (allowaddr(optarg) == -1)
319				usage();
320			break;
321		case 'f':		/* configuration file */
322			ConfFile = optarg;
323			break;
324		case 'm':		/* mark interval */
325			MarkInterval = atoi(optarg) * 60;
326			break;
327		case 'p':		/* path */
328			funixn[0] = optarg;
329			break;
330		case 's':		/* no network mode */
331			SecureMode++;
332			break;
333		case 'l':
334			if (nfunix < MAXFUNIX)
335				funixn[nfunix++] = optarg;
336			else
337				warnx("out of descriptors, ignoring %s",
338					optarg);
339			break;
340		case 'u':		/* only log specified priority */
341		        UniquePriority++;
342			break;
343		case 'v':		/* log facility and priority */
344		  	LogFacPri++;
345			break;
346		case '?':
347		default:
348			usage();
349		}
350	if ((argc -= optind) != 0)
351		usage();
352
353	if (!Debug) {
354		ppid = waitdaemon(0, 0, 30);
355		if (ppid < 0)
356			err(1, "could not become daemon");
357	} else
358		setlinebuf(stdout);
359
360	if (NumAllowed)
361		endservent();
362
363	consfile.f_type = F_CONSOLE;
364	(void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1);
365	(void)gethostname(LocalHostName, sizeof(LocalHostName));
366	if ((p = strchr(LocalHostName, '.')) != NULL) {
367		*p++ = '\0';
368		LocalDomain = p;
369	} else
370		LocalDomain = "";
371	(void)strcpy(bootfile, getbootfile());
372	(void)signal(SIGTERM, die);
373	(void)signal(SIGINT, Debug ? die : SIG_IGN);
374	(void)signal(SIGQUIT, Debug ? die : SIG_IGN);
375	/*
376	 * We don't want the SIGCHLD and SIGHUP handlers to interfere
377	 * with each other; they are likely candidates for being called
378	 * simultaneously (SIGHUP closes pipe descriptor, process dies,
379	 * SIGCHLD happens).
380	 */
381	sigemptyset(&mask);
382	sigaddset(&mask, SIGHUP);
383	sact.sa_handler = reapchild;
384	sact.sa_mask = mask;
385	sact.sa_flags = SA_RESTART;
386	(void)sigaction(SIGCHLD, &sact, NULL);
387	(void)signal(SIGALRM, domark);
388	(void)signal(SIGPIPE, SIG_IGN);	/* We'll catch EPIPE instead. */
389	(void)alarm(TIMERINTVL);
390
391	TAILQ_INIT(&deadq_head);
392
393#ifndef SUN_LEN
394#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
395#endif
396	for (i = 0; i < nfunix; i++) {
397		memset(&sunx, 0, sizeof(sunx));
398		sunx.sun_family = AF_UNIX;
399		(void)strncpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path));
400		funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0);
401		if (funix[i] < 0 ||
402		    bind(funix[i], (struct sockaddr *)&sunx,
403			 SUN_LEN(&sunx)) < 0 ||
404		    chmod(funixn[i], 0666) < 0) {
405			(void) snprintf(line, sizeof line,
406					"cannot create %s", funixn[i]);
407			logerror(line);
408			dprintf("cannot create %s (%d)\n", funixn[i], errno);
409			if (i == 0)
410				die(0);
411		}
412	}
413	if (SecureMode <= 1)
414		finet = socket(AF_INET, SOCK_DGRAM, 0);
415	if (finet >= 0) {
416		struct servent *sp;
417
418		sp = getservbyname("syslog", "udp");
419		if (sp == NULL) {
420			errno = 0;
421			logerror("syslog/udp: unknown service");
422			die(0);
423		}
424		memset(&sin, 0, sizeof(sin));
425		sin.sin_family = AF_INET;
426		sin.sin_port = LogPort = sp->s_port;
427
428		if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
429			logerror("bind");
430			if (!Debug)
431				die(0);
432		}
433	}
434	if (finet >= 0 && SecureMode) {
435		if (shutdown(finet, SHUT_RD) < 0) {
436			logerror("shutdown");
437			if (!Debug)
438				die(0);
439		}
440	}
441
442	if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
443		if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
444			fklog = -1;
445	if (fklog < 0)
446		dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
447
448	/* tuck my process id away */
449	fp = fopen(PidFile, "w");
450	if (fp != NULL) {
451		fprintf(fp, "%d\n", getpid());
452		(void) fclose(fp);
453	}
454
455	dprintf("off & running....\n");
456
457	init(0);
458	/* prevent SIGHUP and SIGCHLD handlers from running in parallel */
459	sigemptyset(&mask);
460	sigaddset(&mask, SIGCHLD);
461	sact.sa_handler = init;
462	sact.sa_mask = mask;
463	sact.sa_flags = SA_RESTART;
464	(void)sigaction(SIGHUP, &sact, NULL);
465
466	tvp = &tv;
467	tv.tv_sec = tv.tv_usec = 0;
468
469	for (;;) {
470		fd_set readfds;
471		int nfds = 0;
472
473		FD_ZERO(&readfds);
474		if (fklog != -1) {
475			FD_SET(fklog, &readfds);
476			if (fklog > nfds)
477				nfds = fklog;
478		}
479		if (finet != -1 && !SecureMode) {
480			FD_SET(finet, &readfds);
481			if (finet > nfds)
482				nfds = finet;
483		}
484		for (i = 0; i < nfunix; i++) {
485			if (funix[i] != -1) {
486				FD_SET(funix[i], &readfds);
487				if (funix[i] > nfds)
488					nfds = funix[i];
489			}
490		}
491
492		/*dprintf("readfds = %#x\n", readfds);*/
493		nfds = select(nfds+1, &readfds, (fd_set *)NULL,
494			      (fd_set *)NULL, tvp);
495		if (nfds == 0) {
496			if (tvp) {
497				tvp = NULL;
498				if (ppid != 1)
499					kill(ppid, SIGALRM);
500			}
501			continue;
502		}
503		if (nfds < 0) {
504			if (errno != EINTR)
505				logerror("select");
506			continue;
507		}
508		/*dprintf("got a message (%d, %#x)\n", nfds, readfds);*/
509		if (fklog != -1 && FD_ISSET(fklog, &readfds))
510			readklog();
511		if (finet != -1 && FD_ISSET(finet, &readfds)) {
512			len = sizeof(frominet);
513			l = recvfrom(finet, line, MAXLINE, 0,
514			    (struct sockaddr *)&frominet, &len);
515			if (l > 0) {
516				line[l] = '\0';
517				hname = cvthname(&frominet);
518				if (validate(&frominet, hname))
519					printline(hname, line);
520			} else if (l < 0 && errno != EINTR)
521				logerror("recvfrom inet");
522		}
523		for (i = 0; i < nfunix; i++) {
524			if (funix[i] != -1 && FD_ISSET(funix[i], &readfds)) {
525				len = sizeof(fromunix);
526				l = recvfrom(funix[i], line, MAXLINE, 0,
527				    (struct sockaddr *)&fromunix, &len);
528				if (l > 0) {
529					line[l] = '\0';
530					printline(LocalHostName, line);
531				} else if (l < 0 && errno != EINTR)
532					logerror("recvfrom unix");
533			}
534		}
535	}
536}
537
538static void
539usage()
540{
541
542	fprintf(stderr, "%s\n%s\n%s\n",
543		"usage: syslogd [-dsuv] [-a allowed_peer] [-f config_file]",
544		"               [-m mark_interval] [-p log_socket]",
545		"               [-l log_socket]");
546	exit(1);
547}
548
549/*
550 * Take a raw input line, decode the message, and print the message
551 * on the appropriate log files.
552 */
553void
554printline(hname, msg)
555	char *hname;
556	char *msg;
557{
558	int c, pri;
559	char *p, *q, line[MAXLINE + 1];
560
561	/* test for special codes */
562	pri = DEFUPRI;
563	p = msg;
564	if (*p == '<') {
565		pri = 0;
566		while (isdigit(*++p))
567			pri = 10 * pri + (*p - '0');
568		if (*p == '>')
569			++p;
570	}
571	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
572		pri = DEFUPRI;
573
574	/* don't allow users to log kernel messages */
575	if (LOG_FAC(pri) == LOG_KERN)
576		pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
577
578	q = line;
579
580	while ((c = *p++ & 0177) != '\0' &&
581	    q < &line[sizeof(line) - 1])
582		if (iscntrl(c))
583			if (c == '\n')
584				*q++ = ' ';
585			else if (c == '\t')
586				*q++ = '\t';
587			else {
588				*q++ = '^';
589				*q++ = c ^ 0100;
590			}
591		else
592			*q++ = c;
593	*q = '\0';
594
595	logmsg(pri, line, hname, 0);
596}
597
598/*
599 * Read /dev/klog while data are available, split into lines.
600 */
601void
602readklog()
603{
604	char *p, *q, line[MAXLINE + 1];
605	int len, i;
606
607	len = 0;
608	for (;;) {
609		i = read(fklog, line + len, MAXLINE - 1 - len);
610		if (i > 0)
611			line[i + len] = '\0';
612		else if (i < 0 && errno != EINTR && errno != EAGAIN) {
613			logerror("klog");
614			fklog = -1;
615			break;
616		} else
617			break;
618
619		for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
620			*q = '\0';
621			printsys(p);
622		}
623		len = strlen(p);
624		if (len >= MAXLINE - 1) {
625			printsys(p);
626			len = 0;
627		}
628		if (len > 0)
629			memmove(line, p, len + 1);
630	}
631	if (len > 0)
632		printsys(line);
633}
634
635/*
636 * Take a raw input line from /dev/klog, format similar to syslog().
637 */
638void
639printsys(p)
640	char *p;
641{
642	int pri, flags;
643
644	flags = ISKERNEL | SYNC_FILE | ADDDATE;	/* fsync after write */
645	pri = DEFSPRI;
646	if (*p == '<') {
647		pri = 0;
648		while (isdigit(*++p))
649			pri = 10 * pri + (*p - '0');
650		if (*p == '>')
651			++p;
652	} else {
653		/* kernel printf's come out on console */
654		flags |= IGN_CONS;
655	}
656	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
657		pri = DEFSPRI;
658	logmsg(pri, p, LocalHostName, flags);
659}
660
661time_t	now;
662
663/*
664 * Log a message to the appropriate log files, users, etc. based on
665 * the priority.
666 */
667void
668logmsg(pri, msg, from, flags)
669	int pri;
670	char *msg, *from;
671	int flags;
672{
673	struct filed *f;
674	int i, fac, msglen, omask, prilev;
675	char *timestamp;
676 	char prog[NAME_MAX+1];
677	char buf[MAXLINE+1];
678
679	dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
680	    pri, flags, from, msg);
681
682	omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
683
684	/*
685	 * Check to see if msg looks non-standard.
686	 */
687	msglen = strlen(msg);
688	if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
689	    msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
690		flags |= ADDDATE;
691
692	(void)time(&now);
693	if (flags & ADDDATE)
694		timestamp = ctime(&now) + 4;
695	else {
696		timestamp = msg;
697		msg += 16;
698		msglen -= 16;
699	}
700
701	/* skip leading blanks */
702	while(isspace(*msg)) {
703		msg++;
704		msglen--;
705	}
706
707	/* extract facility and priority level */
708	if (flags & MARK)
709		fac = LOG_NFACILITIES;
710	else
711		fac = LOG_FAC(pri);
712	prilev = LOG_PRI(pri);
713
714	/* extract program name */
715	for(i = 0; i < NAME_MAX; i++) {
716		if(!isalnum(msg[i]))
717			break;
718		prog[i] = msg[i];
719	}
720	prog[i] = 0;
721
722	/* add kernel prefix for kernel messages */
723	if (flags & ISKERNEL) {
724		snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg);
725		msg = buf;
726		msglen = strlen(buf);
727	}
728
729	/* log the message to the particular outputs */
730	if (!Initialized) {
731		f = &consfile;
732		f->f_file = open(ctty, O_WRONLY, 0);
733
734		if (f->f_file >= 0) {
735			fprintlog(f, flags, msg);
736			(void)close(f->f_file);
737		}
738		(void)sigsetmask(omask);
739		return;
740	}
741	for (f = Files; f; f = f->f_next) {
742		/* skip messages that are incorrect priority */
743		if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
744		     ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
745		     ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
746		     )
747		    || f->f_pmask[fac] == INTERNAL_NOPRI)
748			continue;
749		/* skip messages with the incorrect program name */
750		if(f->f_program)
751			if(strcmp(prog, f->f_program) != 0)
752				continue;
753
754		if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
755			continue;
756
757		/* don't output marks to recently written files */
758		if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
759			continue;
760
761		/*
762		 * suppress duplicate lines to this file
763		 */
764		if ((flags & MARK) == 0 && msglen == f->f_prevlen &&
765		    !strcmp(msg, f->f_prevline) &&
766		    !strcasecmp(from, f->f_prevhost)) {
767			(void)strncpy(f->f_lasttime, timestamp, 15);
768			f->f_prevcount++;
769			dprintf("msg repeated %d times, %ld sec of %d\n",
770			    f->f_prevcount, (long)(now - f->f_time),
771			    repeatinterval[f->f_repeatcount]);
772			/*
773			 * If domark would have logged this by now,
774			 * flush it now (so we don't hold isolated messages),
775			 * but back off so we'll flush less often
776			 * in the future.
777			 */
778			if (now > REPEATTIME(f)) {
779				fprintlog(f, flags, (char *)NULL);
780				BACKOFF(f);
781			}
782		} else {
783			/* new line, save it */
784			if (f->f_prevcount)
785				fprintlog(f, 0, (char *)NULL);
786			f->f_repeatcount = 0;
787			f->f_prevpri = pri;
788			(void)strncpy(f->f_lasttime, timestamp, 15);
789			(void)strncpy(f->f_prevhost, from,
790					sizeof(f->f_prevhost)-1);
791			f->f_prevhost[sizeof(f->f_prevhost)-1] = '\0';
792			if (msglen < MAXSVLINE) {
793				f->f_prevlen = msglen;
794				(void)strcpy(f->f_prevline, msg);
795				fprintlog(f, flags, (char *)NULL);
796			} else {
797				f->f_prevline[0] = 0;
798				f->f_prevlen = 0;
799				fprintlog(f, flags, msg);
800			}
801		}
802	}
803	(void)sigsetmask(omask);
804}
805
806void
807fprintlog(f, flags, msg)
808	struct filed *f;
809	int flags;
810	char *msg;
811{
812	struct iovec iov[7];
813	struct iovec *v;
814	int l;
815	char line[MAXLINE + 1], repbuf[80], greetings[200];
816	char *msgret;
817
818	v = iov;
819	if (f->f_type == F_WALL) {
820		v->iov_base = greetings;
821		v->iov_len = snprintf(greetings, sizeof greetings,
822		    "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
823		    f->f_prevhost, ctime(&now));
824		v++;
825		v->iov_base = "";
826		v->iov_len = 0;
827		v++;
828	} else {
829		v->iov_base = f->f_lasttime;
830		v->iov_len = 15;
831		v++;
832		v->iov_base = " ";
833		v->iov_len = 1;
834		v++;
835	}
836
837	if (LogFacPri) {
838	  	static char fp_buf[30];	/* Hollow laugh */
839		int fac = f->f_prevpri & LOG_FACMASK;
840		int pri = LOG_PRI(f->f_prevpri);
841		char *f_s = 0;
842		char f_n[5];	/* Hollow laugh */
843		char *p_s = 0;
844		char p_n[5];	/* Hollow laugh */
845
846		if (LogFacPri > 1) {
847		  CODE *c;
848
849		  for (c = facilitynames; c->c_name; c++) {
850		    if (c->c_val == fac) {
851		      f_s = c->c_name;
852		      break;
853		    }
854		  }
855		  for (c = prioritynames; c->c_name; c++) {
856		    if (c->c_val == pri) {
857		      p_s = c->c_name;
858		      break;
859		    }
860		  }
861		}
862		if (!f_s) {
863		  snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
864		  f_s = f_n;
865		}
866		if (!p_s) {
867		  snprintf(p_n, sizeof p_n, "%d", pri);
868		  p_s = p_n;
869		}
870		snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
871		v->iov_base = fp_buf;
872		v->iov_len = strlen(fp_buf);
873	} else {
874	        v->iov_base="";
875		v->iov_len = 0;
876	}
877	v++;
878
879	v->iov_base = f->f_prevhost;
880	v->iov_len = strlen(v->iov_base);
881	v++;
882	v->iov_base = " ";
883	v->iov_len = 1;
884	v++;
885
886	if (msg) {
887		v->iov_base = msg;
888		v->iov_len = strlen(msg);
889	} else if (f->f_prevcount > 1) {
890		v->iov_base = repbuf;
891		v->iov_len = sprintf(repbuf, "last message repeated %d times",
892		    f->f_prevcount);
893	} else {
894		v->iov_base = f->f_prevline;
895		v->iov_len = f->f_prevlen;
896	}
897	v++;
898
899	dprintf("Logging to %s", TypeNames[f->f_type]);
900	f->f_time = now;
901
902	switch (f->f_type) {
903	case F_UNUSED:
904		dprintf("\n");
905		break;
906
907	case F_FORW:
908		dprintf(" %s\n", f->f_un.f_forw.f_hname);
909		/* check for local vs remote messages */
910		if (strcasecmp(f->f_prevhost, LocalHostName))
911			l = snprintf(line, sizeof line - 1,
912			    "<%d>%.15s Forwarded from %s: %s",
913			    f->f_prevpri, iov[0].iov_base, f->f_prevhost,
914			    iov[5].iov_base);
915		else
916			l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
917			     f->f_prevpri, iov[0].iov_base, iov[5].iov_base);
918		if (l > MAXLINE)
919			l = MAXLINE;
920		if ((finet >= 0) &&
921		     (sendto(finet, line, l, 0,
922			     (struct sockaddr *)&f->f_un.f_forw.f_addr,
923			     sizeof(f->f_un.f_forw.f_addr)) != l)) {
924			int e = errno;
925			(void)close(f->f_file);
926			f->f_type = F_UNUSED;
927			errno = e;
928			logerror("sendto");
929		}
930		break;
931
932	case F_FILE:
933		dprintf(" %s\n", f->f_un.f_fname);
934		v->iov_base = "\n";
935		v->iov_len = 1;
936		if (writev(f->f_file, iov, 7) < 0) {
937			int e = errno;
938			(void)close(f->f_file);
939			f->f_type = F_UNUSED;
940			errno = e;
941			logerror(f->f_un.f_fname);
942		} else if (flags & SYNC_FILE)
943			(void)fsync(f->f_file);
944		break;
945
946	case F_PIPE:
947		dprintf(" %s\n", f->f_un.f_pipe.f_pname);
948		v->iov_base = "\n";
949		v->iov_len = 1;
950		if (f->f_un.f_pipe.f_pid == 0) {
951			if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
952						&f->f_un.f_pipe.f_pid)) < 0) {
953				f->f_type = F_UNUSED;
954				logerror(f->f_un.f_pipe.f_pname);
955				break;
956			}
957		}
958		if (writev(f->f_file, iov, 7) < 0) {
959			int e = errno;
960			(void)close(f->f_file);
961			if (f->f_un.f_pipe.f_pid > 0)
962				deadq_enter(f->f_un.f_pipe.f_pid,
963					    f->f_un.f_pipe.f_pname);
964			f->f_un.f_pipe.f_pid = 0;
965			errno = e;
966			logerror(f->f_un.f_pipe.f_pname);
967		}
968		break;
969
970	case F_CONSOLE:
971		if (flags & IGN_CONS) {
972			dprintf(" (ignored)\n");
973			break;
974		}
975		/* FALLTHROUGH */
976
977	case F_TTY:
978		dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
979		v->iov_base = "\r\n";
980		v->iov_len = 2;
981
982		errno = 0;	/* ttymsg() only sometimes returns an errno */
983		if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) {
984			f->f_type = F_UNUSED;
985			logerror(msgret);
986		}
987		break;
988
989	case F_USERS:
990	case F_WALL:
991		dprintf("\n");
992		v->iov_base = "\r\n";
993		v->iov_len = 2;
994		wallmsg(f, iov);
995		break;
996	}
997	f->f_prevcount = 0;
998}
999
1000/*
1001 *  WALLMSG -- Write a message to the world at large
1002 *
1003 *	Write the specified message to either the entire
1004 *	world, or a list of approved users.
1005 */
1006void
1007wallmsg(f, iov)
1008	struct filed *f;
1009	struct iovec *iov;
1010{
1011	static int reenter;			/* avoid calling ourselves */
1012	FILE *uf;
1013	struct utmp ut;
1014	int i;
1015	char *p;
1016	char line[sizeof(ut.ut_line) + 1];
1017
1018	if (reenter++)
1019		return;
1020	if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1021		logerror(_PATH_UTMP);
1022		reenter = 0;
1023		return;
1024	}
1025	/* NOSTRICT */
1026	while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1027		if (ut.ut_name[0] == '\0')
1028			continue;
1029		strncpy(line, ut.ut_line, sizeof(ut.ut_line));
1030		line[sizeof(ut.ut_line)] = '\0';
1031		if (f->f_type == F_WALL) {
1032			if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) {
1033				errno = 0;	/* already in msg */
1034				logerror(p);
1035			}
1036			continue;
1037		}
1038		/* should we send the message to this user? */
1039		for (i = 0; i < MAXUNAMES; i++) {
1040			if (!f->f_un.f_uname[i][0])
1041				break;
1042			if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1043			    UT_NAMESIZE)) {
1044				if ((p = ttymsg(iov, 7, line, TTYMSGTIME))
1045								!= NULL) {
1046					errno = 0;	/* already in msg */
1047					logerror(p);
1048				}
1049				break;
1050			}
1051		}
1052	}
1053	(void)fclose(uf);
1054	reenter = 0;
1055}
1056
1057void
1058reapchild(signo)
1059	int signo;
1060{
1061	int status;
1062	pid_t pid;
1063	struct filed *f;
1064
1065	while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1066		if (!Initialized)
1067			/* Don't tell while we are initting. */
1068			continue;
1069
1070		/* First, look if it's a process from the dead queue. */
1071		if (deadq_remove(pid))
1072			goto oncemore;
1073
1074		/* Now, look in list of active processes. */
1075		for (f = Files; f; f = f->f_next)
1076			if (f->f_type == F_PIPE &&
1077			    f->f_un.f_pipe.f_pid == pid) {
1078				(void)close(f->f_file);
1079				f->f_un.f_pipe.f_pid = 0;
1080				log_deadchild(pid, status,
1081					      f->f_un.f_pipe.f_pname);
1082				break;
1083			}
1084	  oncemore:
1085		continue;
1086	}
1087}
1088
1089/*
1090 * Return a printable representation of a host address.
1091 */
1092char *
1093cvthname(f)
1094	struct sockaddr_in *f;
1095{
1096	struct hostent *hp;
1097	sigset_t omask, nmask;
1098	char *p;
1099
1100	dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr));
1101
1102	if (f->sin_family != AF_INET) {
1103		dprintf("Malformed from address\n");
1104		return ("???");
1105	}
1106	sigemptyset(&nmask);
1107	sigaddset(&nmask, SIGHUP);
1108	sigprocmask(SIG_BLOCK, &nmask, &omask);
1109	hp = gethostbyaddr((char *)&f->sin_addr,
1110	    sizeof(struct in_addr), f->sin_family);
1111	sigprocmask(SIG_SETMASK, &omask, NULL);
1112	if (hp == 0) {
1113		dprintf("Host name for your address (%s) unknown\n",
1114			inet_ntoa(f->sin_addr));
1115		return (inet_ntoa(f->sin_addr));
1116	}
1117	if ((p = strchr(hp->h_name, '.')) &&
1118	    strcasecmp(p + 1, LocalDomain) == 0)
1119		*p = '\0';
1120	return (hp->h_name);
1121}
1122
1123void
1124domark(signo)
1125	int signo;
1126{
1127	struct filed *f;
1128	dq_t q;
1129
1130	now = time((time_t *)NULL);
1131	MarkSeq += TIMERINTVL;
1132	if (MarkSeq >= MarkInterval) {
1133		logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK);
1134		MarkSeq = 0;
1135	}
1136
1137	for (f = Files; f; f = f->f_next) {
1138		if (f->f_prevcount && now >= REPEATTIME(f)) {
1139			dprintf("flush %s: repeated %d times, %d sec.\n",
1140			    TypeNames[f->f_type], f->f_prevcount,
1141			    repeatinterval[f->f_repeatcount]);
1142			fprintlog(f, 0, (char *)NULL);
1143			BACKOFF(f);
1144		}
1145	}
1146
1147	/* Walk the dead queue, and see if we should signal somebody. */
1148	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
1149		switch (q->dq_timeout) {
1150		case 0:
1151			/* Already signalled once, try harder now. */
1152			if (kill(q->dq_pid, SIGKILL) != 0)
1153				(void)deadq_remove(q->dq_pid);
1154			break;
1155
1156		case 1:
1157			/*
1158			 * Timed out on dead queue, send terminate
1159			 * signal.  Note that we leave the removal
1160			 * from the dead queue to reapchild(), which
1161			 * will also log the event (unless the process
1162			 * didn't even really exist, in case we simply
1163			 * drop it from the dead queue).
1164			 */
1165			if (kill(q->dq_pid, SIGTERM) != 0)
1166				(void)deadq_remove(q->dq_pid);
1167			/* FALLTHROUGH */
1168
1169		default:
1170			q->dq_timeout--;
1171		}
1172
1173	(void)alarm(TIMERINTVL);
1174}
1175
1176/*
1177 * Print syslogd errors some place.
1178 */
1179void
1180logerror(type)
1181	const char *type;
1182{
1183	char buf[512];
1184
1185	if (errno)
1186		(void)snprintf(buf,
1187		    sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1188	else
1189		(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1190	errno = 0;
1191	dprintf("%s\n", buf);
1192	logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1193}
1194
1195void
1196die(signo)
1197	int signo;
1198{
1199	struct filed *f;
1200	int was_initialized;
1201	char buf[100];
1202	int i;
1203
1204	was_initialized = Initialized;
1205	Initialized = 0;	/* Don't log SIGCHLDs. */
1206	for (f = Files; f != NULL; f = f->f_next) {
1207		/* flush any pending output */
1208		if (f->f_prevcount)
1209			fprintlog(f, 0, (char *)NULL);
1210		if (f->f_type == F_PIPE)
1211			(void)close(f->f_file);
1212	}
1213	Initialized = was_initialized;
1214	if (signo) {
1215		dprintf("syslogd: exiting on signal %d\n", signo);
1216		(void)sprintf(buf, "exiting on signal %d", signo);
1217		errno = 0;
1218		logerror(buf);
1219	}
1220	for (i = 0; i < nfunix; i++)
1221		if (funixn[i] && funix[i] != -1)
1222			(void)unlink(funixn[i]);
1223	exit(1);
1224}
1225
1226/*
1227 *  INIT -- Initialize syslogd from configuration table
1228 */
1229void
1230init(signo)
1231	int signo;
1232{
1233	int i;
1234	FILE *cf;
1235	struct filed *f, *next, **nextp;
1236	char *p;
1237	char cline[LINE_MAX];
1238 	char prog[NAME_MAX+1];
1239
1240	dprintf("init\n");
1241
1242	/*
1243	 *  Close all open log files.
1244	 */
1245	Initialized = 0;
1246	for (f = Files; f != NULL; f = next) {
1247		/* flush any pending output */
1248		if (f->f_prevcount)
1249			fprintlog(f, 0, (char *)NULL);
1250
1251		switch (f->f_type) {
1252		case F_FILE:
1253		case F_FORW:
1254		case F_CONSOLE:
1255		case F_TTY:
1256			(void)close(f->f_file);
1257			break;
1258		case F_PIPE:
1259			(void)close(f->f_file);
1260			if (f->f_un.f_pipe.f_pid > 0)
1261				deadq_enter(f->f_un.f_pipe.f_pid,
1262					    f->f_un.f_pipe.f_pname);
1263			f->f_un.f_pipe.f_pid = 0;
1264			break;
1265		}
1266		next = f->f_next;
1267		if(f->f_program) free(f->f_program);
1268		free((char *)f);
1269	}
1270	Files = NULL;
1271	nextp = &Files;
1272
1273	/* open the configuration file */
1274	if ((cf = fopen(ConfFile, "r")) == NULL) {
1275		dprintf("cannot open %s\n", ConfFile);
1276		*nextp = (struct filed *)calloc(1, sizeof(*f));
1277		cfline("*.ERR\t/dev/console", *nextp, "*");
1278		(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1279		cfline("*.PANIC\t*", (*nextp)->f_next, "*");
1280		Initialized = 1;
1281		return;
1282	}
1283
1284	/*
1285	 *  Foreach line in the conf table, open that file.
1286	 */
1287	f = NULL;
1288	strcpy(prog, "*");
1289	while (fgets(cline, sizeof(cline), cf) != NULL) {
1290		/*
1291		 * check for end-of-section, comments, strip off trailing
1292		 * spaces and newline character. #!prog is treated specially:
1293		 * following lines apply only to that program.
1294		 */
1295		for (p = cline; isspace(*p); ++p)
1296			continue;
1297		if (*p == 0)
1298			continue;
1299		if(*p == '#') {
1300			p++;
1301			if(*p!='!')
1302				continue;
1303		}
1304		if(*p=='!') {
1305			p++;
1306			while(isspace(*p)) p++;
1307			if((!*p) || (*p == '*')) {
1308				strcpy(prog, "*");
1309				continue;
1310			}
1311			for(i = 0; i < NAME_MAX; i++) {
1312				if(!isalnum(p[i]))
1313					break;
1314				prog[i] = p[i];
1315			}
1316			prog[i] = 0;
1317			continue;
1318		}
1319		for (p = strchr(cline, '\0'); isspace(*--p);)
1320			continue;
1321		*++p = '\0';
1322		f = (struct filed *)calloc(1, sizeof(*f));
1323		*nextp = f;
1324		nextp = &f->f_next;
1325		cfline(cline, f, prog);
1326	}
1327
1328	/* close the configuration file */
1329	(void)fclose(cf);
1330
1331	Initialized = 1;
1332
1333	if (Debug) {
1334		for (f = Files; f; f = f->f_next) {
1335			for (i = 0; i <= LOG_NFACILITIES; i++)
1336				if (f->f_pmask[i] == INTERNAL_NOPRI)
1337					printf("X ");
1338				else
1339					printf("%d ", f->f_pmask[i]);
1340			printf("%s: ", TypeNames[f->f_type]);
1341			switch (f->f_type) {
1342			case F_FILE:
1343				printf("%s", f->f_un.f_fname);
1344				break;
1345
1346			case F_CONSOLE:
1347			case F_TTY:
1348				printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1349				break;
1350
1351			case F_FORW:
1352				printf("%s", f->f_un.f_forw.f_hname);
1353				break;
1354
1355			case F_PIPE:
1356				printf("%s", f->f_un.f_pipe.f_pname);
1357				break;
1358
1359			case F_USERS:
1360				for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1361					printf("%s, ", f->f_un.f_uname[i]);
1362				break;
1363			}
1364			if(f->f_program) {
1365				printf(" (%s)", f->f_program);
1366			}
1367			printf("\n");
1368		}
1369	}
1370
1371	logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1372	dprintf("syslogd: restarted\n");
1373}
1374
1375/*
1376 * Crack a configuration file line
1377 */
1378void
1379cfline(line, f, prog)
1380	char *line;
1381	struct filed *f;
1382	char *prog;
1383{
1384	struct hostent *hp;
1385	int i, pri;
1386	char *bp, *p, *q;
1387	char buf[MAXLINE], ebuf[100];
1388
1389	dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog);
1390
1391	errno = 0;	/* keep strerror() stuff out of logerror messages */
1392
1393	/* clear out file entry */
1394	memset(f, 0, sizeof(*f));
1395	for (i = 0; i <= LOG_NFACILITIES; i++)
1396		f->f_pmask[i] = INTERNAL_NOPRI;
1397
1398	/* save program name if any */
1399	if(prog && *prog=='*') prog = NULL;
1400	if(prog) {
1401		f->f_program = calloc(1, strlen(prog)+1);
1402		if(f->f_program) {
1403			strcpy(f->f_program, prog);
1404		}
1405	}
1406
1407	/* scan through the list of selectors */
1408	for (p = line; *p && *p != '\t' && *p != ' ';) {
1409		int pri_done;
1410		int pri_cmp;
1411
1412		/* find the end of this facility name list */
1413		for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1414			continue;
1415
1416		/* get the priority comparison */
1417		pri_cmp = 0;
1418		pri_done = 0;
1419		while (!pri_done) {
1420			switch (*q) {
1421			case '<':
1422				pri_cmp |= PRI_LT;
1423				q++;
1424				break;
1425			case '=':
1426				pri_cmp |= PRI_EQ;
1427				q++;
1428				break;
1429			case '>':
1430				pri_cmp |= PRI_GT;
1431				q++;
1432				break;
1433			default:
1434				pri_done++;
1435				break;
1436			}
1437		}
1438		if (!pri_cmp)
1439			pri_cmp = (UniquePriority)
1440				  ? (PRI_EQ)
1441				  : (PRI_EQ | PRI_GT)
1442				  ;
1443
1444		/* collect priority name */
1445		for (bp = buf; *q && !strchr("\t,; ", *q); )
1446			*bp++ = *q++;
1447		*bp = '\0';
1448
1449		/* skip cruft */
1450		while (strchr(",;", *q))
1451			q++;
1452
1453		/* decode priority name */
1454		if (*buf == '*')
1455			pri = LOG_PRIMASK + 1;
1456		else {
1457			pri = decode(buf, prioritynames);
1458			if (pri < 0) {
1459				(void)snprintf(ebuf, sizeof ebuf,
1460				    "unknown priority name \"%s\"", buf);
1461				logerror(ebuf);
1462				return;
1463			}
1464		}
1465
1466		/* scan facilities */
1467		while (*p && !strchr("\t.; ", *p)) {
1468			for (bp = buf; *p && !strchr("\t,;. ", *p); )
1469				*bp++ = *p++;
1470			*bp = '\0';
1471
1472			if (*buf == '*')
1473				for (i = 0; i < LOG_NFACILITIES; i++) {
1474					f->f_pmask[i] = pri;
1475					f->f_pcmp[i] = pri_cmp;
1476				}
1477			else {
1478				i = decode(buf, facilitynames);
1479				if (i < 0) {
1480					(void)snprintf(ebuf, sizeof ebuf,
1481					    "unknown facility name \"%s\"",
1482					    buf);
1483					logerror(ebuf);
1484					return;
1485				}
1486				f->f_pmask[i >> 3] = pri;
1487				f->f_pcmp[i >> 3] = pri_cmp;
1488			}
1489			while (*p == ',' || *p == ' ')
1490				p++;
1491		}
1492
1493		p = q;
1494	}
1495
1496	/* skip to action part */
1497	while (*p == '\t' || *p == ' ')
1498		p++;
1499
1500	switch (*p)
1501	{
1502	case '@':
1503		(void)strncpy(f->f_un.f_forw.f_hname, ++p,
1504			sizeof(f->f_un.f_forw.f_hname)-1);
1505		f->f_un.f_forw.f_hname[sizeof(f->f_un.f_forw.f_hname)-1] = '\0';
1506		hp = gethostbyname(f->f_un.f_forw.f_hname);
1507		if (hp == NULL) {
1508			extern int h_errno;
1509
1510			logerror(hstrerror(h_errno));
1511			break;
1512		}
1513		memset(&f->f_un.f_forw.f_addr, 0,
1514			 sizeof(f->f_un.f_forw.f_addr));
1515		f->f_un.f_forw.f_addr.sin_family = AF_INET;
1516		f->f_un.f_forw.f_addr.sin_port = LogPort;
1517		memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length);
1518		f->f_type = F_FORW;
1519		break;
1520
1521	case '/':
1522		if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
1523			f->f_type = F_UNUSED;
1524			logerror(p);
1525			break;
1526		}
1527		if (isatty(f->f_file)) {
1528			if (strcmp(p, ctty) == 0)
1529				f->f_type = F_CONSOLE;
1530			else
1531				f->f_type = F_TTY;
1532			(void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1);
1533		} else {
1534			(void)strcpy(f->f_un.f_fname, p);
1535			f->f_type = F_FILE;
1536		}
1537		break;
1538
1539	case '|':
1540		f->f_un.f_pipe.f_pid = 0;
1541		(void)strcpy(f->f_un.f_pipe.f_pname, p + 1);
1542		f->f_type = F_PIPE;
1543		break;
1544
1545	case '*':
1546		f->f_type = F_WALL;
1547		break;
1548
1549	default:
1550		for (i = 0; i < MAXUNAMES && *p; i++) {
1551			for (q = p; *q && *q != ','; )
1552				q++;
1553			(void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
1554			if ((q - p) > UT_NAMESIZE)
1555				f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
1556			else
1557				f->f_un.f_uname[i][q - p] = '\0';
1558			while (*q == ',' || *q == ' ')
1559				q++;
1560			p = q;
1561		}
1562		f->f_type = F_USERS;
1563		break;
1564	}
1565}
1566
1567
1568/*
1569 *  Decode a symbolic name to a numeric value
1570 */
1571int
1572decode(name, codetab)
1573	const char *name;
1574	CODE *codetab;
1575{
1576	CODE *c;
1577	char *p, buf[40];
1578
1579	if (isdigit(*name))
1580		return (atoi(name));
1581
1582	for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
1583		if (isupper(*name))
1584			*p = tolower(*name);
1585		else
1586			*p = *name;
1587	}
1588	*p = '\0';
1589	for (c = codetab; c->c_name; c++)
1590		if (!strcmp(buf, c->c_name))
1591			return (c->c_val);
1592
1593	return (-1);
1594}
1595
1596/*
1597 * fork off and become a daemon, but wait for the child to come online
1598 * before returing to the parent, or we get disk thrashing at boot etc.
1599 * Set a timer so we don't hang forever if it wedges.
1600 */
1601int
1602waitdaemon(nochdir, noclose, maxwait)
1603	int nochdir, noclose, maxwait;
1604{
1605	int fd;
1606	int status;
1607	pid_t pid, childpid;
1608
1609	switch (childpid = fork()) {
1610	case -1:
1611		return (-1);
1612	case 0:
1613		break;
1614	default:
1615		signal(SIGALRM, timedout);
1616		alarm(maxwait);
1617		while ((pid = wait3(&status, 0, NULL)) != -1) {
1618			if (WIFEXITED(status))
1619				errx(1, "child pid %d exited with return code %d",
1620					pid, WEXITSTATUS(status));
1621			if (WIFSIGNALED(status))
1622				errx(1, "child pid %d exited on signal %d%s",
1623					pid, WTERMSIG(status),
1624					WCOREDUMP(status) ? " (core dumped)" :
1625					"");
1626			if (pid == childpid)	/* it's gone... */
1627				break;
1628		}
1629		exit(0);
1630	}
1631
1632	if (setsid() == -1)
1633		return (-1);
1634
1635	if (!nochdir)
1636		(void)chdir("/");
1637
1638	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1639		(void)dup2(fd, STDIN_FILENO);
1640		(void)dup2(fd, STDOUT_FILENO);
1641		(void)dup2(fd, STDERR_FILENO);
1642		if (fd > 2)
1643			(void)close (fd);
1644	}
1645	return (getppid());
1646}
1647
1648/*
1649 * We get a SIGALRM from the child when it's running and finished doing it's
1650 * fsync()'s or O_SYNC writes for all the boot messages.
1651 *
1652 * We also get a signal from the kernel if the timer expires, so check to
1653 * see what happened.
1654 */
1655void
1656timedout(sig)
1657	int sig __unused;
1658{
1659	int left;
1660	left = alarm(0);
1661	signal(SIGALRM, SIG_DFL);
1662	if (left == 0)
1663		errx(1, "timed out waiting for child");
1664	else
1665		exit(0);
1666}
1667
1668/*
1669 * Add `s' to the list of allowable peer addresses to accept messages
1670 * from.
1671 *
1672 * `s' is a string in the form:
1673 *
1674 *    [*]domainname[:{servicename|portnumber|*}]
1675 *
1676 * or
1677 *
1678 *    netaddr/maskbits[:{servicename|portnumber|*}]
1679 *
1680 * Returns -1 on error, 0 if the argument was valid.
1681 */
1682int
1683allowaddr(s)
1684	char *s;
1685{
1686	char *cp1, *cp2;
1687	struct allowedpeer ap;
1688	struct servent *se;
1689	regex_t re;
1690	int i;
1691
1692	if ((cp1 = strrchr(s, ':'))) {
1693		/* service/port provided */
1694		*cp1++ = '\0';
1695		if (strlen(cp1) == 1 && *cp1 == '*')
1696			/* any port allowed */
1697			ap.port = htons(0);
1698		else if ((se = getservbyname(cp1, "udp")))
1699			ap.port = se->s_port;
1700		else {
1701			ap.port = htons((int)strtol(cp1, &cp2, 0));
1702			if (*cp2 != '\0')
1703				return -1; /* port not numeric */
1704		}
1705	} else {
1706		if ((se = getservbyname("syslog", "udp")))
1707			ap.port = se->s_port;
1708		else
1709			/* sanity, should not happen */
1710			ap.port = htons(514);
1711	}
1712
1713	/* the regexp's are ugly, but the cleanest way */
1714
1715	if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$",
1716		    REG_EXTENDED))
1717		/* if RE compilation fails, that's an internal error */
1718		abort();
1719	if (regexec(&re, s, 0, 0, 0) == 0) {
1720		/* arg `s' is numeric */
1721		ap.isnumeric = 1;
1722		if ((cp1 = strchr(s, '/')) != NULL) {
1723			*cp1++ = '\0';
1724			i = atoi(cp1);
1725			if (i < 0 || i > 32)
1726				return -1;
1727			/* convert masklen to netmask */
1728			ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1));
1729		}
1730		if (ascii2addr(AF_INET, s, &ap.a_addr) == -1)
1731			return -1;
1732		if (cp1 == NULL) {
1733			/* use default netmask */
1734			if (IN_CLASSA(ntohl(ap.a_addr.s_addr)))
1735				ap.a_mask.s_addr = htonl(IN_CLASSA_NET);
1736			else if (IN_CLASSB(ntohl(ap.a_addr.s_addr)))
1737				ap.a_mask.s_addr = htonl(IN_CLASSB_NET);
1738			else
1739				ap.a_mask.s_addr = htonl(IN_CLASSC_NET);
1740		}
1741	} else {
1742		/* arg `s' is domain name */
1743		ap.isnumeric = 0;
1744		ap.a_name = s;
1745	}
1746	regfree(&re);
1747
1748	if (Debug) {
1749		printf("allowaddr: rule %d: ", NumAllowed);
1750		if (ap.isnumeric) {
1751			printf("numeric, ");
1752			printf("addr = %s, ",
1753			       addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0));
1754			printf("mask = %s; ",
1755			       addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0));
1756		} else
1757			printf("domainname = %s; ", ap.a_name);
1758		printf("port = %d\n", ntohs(ap.port));
1759	}
1760
1761	if ((AllowedPeers = realloc(AllowedPeers,
1762				    ++NumAllowed * sizeof(struct allowedpeer)))
1763	    == NULL) {
1764		fprintf(stderr, "Out of memory!\n");
1765		exit(EX_OSERR);
1766	}
1767	memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
1768	return 0;
1769}
1770
1771/*
1772 * Validate that the remote peer has permission to log to us.
1773 */
1774int
1775validate(sin, hname)
1776	struct sockaddr_in *sin;
1777	const char *hname;
1778{
1779	int i;
1780	size_t l1, l2;
1781	char *cp, name[MAXHOSTNAMELEN];
1782	struct allowedpeer *ap;
1783
1784	if (NumAllowed == 0)
1785		/* traditional behaviour, allow everything */
1786		return 1;
1787
1788	strncpy(name, hname, sizeof name);
1789	if (strchr(name, '.') == NULL) {
1790		strncat(name, ".", sizeof name - strlen(name) - 1);
1791		strncat(name, LocalDomain, sizeof name - strlen(name) - 1);
1792	}
1793	dprintf("validate: dgram from IP %s, port %d, name %s;\n",
1794		addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0),
1795		ntohs(sin->sin_port), name);
1796
1797	/* now, walk down the list */
1798	for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
1799		if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) {
1800			dprintf("rejected in rule %d due to port mismatch.\n", i);
1801			continue;
1802		}
1803
1804		if (ap->isnumeric) {
1805			if ((sin->sin_addr.s_addr & ap->a_mask.s_addr)
1806			    != ap->a_addr.s_addr) {
1807				dprintf("rejected in rule %d due to IP mismatch.\n", i);
1808				continue;
1809			}
1810		} else {
1811			cp = ap->a_name;
1812			l1 = strlen(name);
1813			if (*cp == '*') {
1814				/* allow wildmatch */
1815				cp++;
1816				l2 = strlen(cp);
1817				if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
1818					dprintf("rejected in rule %d due to name mismatch.\n", i);
1819					continue;
1820				}
1821			} else {
1822				/* exact match */
1823				l2 = strlen(cp);
1824				if (l2 != l1 || memcmp(cp, name, l1) != 0) {
1825					dprintf("rejected in rule %d due to name mismatch.\n", i);
1826					continue;
1827				}
1828			}
1829		}
1830		dprintf("accepted in rule %d.\n", i);
1831		return 1;	/* hooray! */
1832	}
1833	return 0;
1834}
1835
1836/*
1837 * Fairly similar to popen(3), but returns an open descriptor, as
1838 * opposed to a FILE *.
1839 */
1840int
1841p_open(prog, pid)
1842	char *prog;
1843	pid_t *pid;
1844{
1845	int pfd[2], nulldesc, i;
1846	sigset_t omask, mask;
1847	char *argv[4]; /* sh -c cmd NULL */
1848	char errmsg[200];
1849
1850	if (pipe(pfd) == -1)
1851		return -1;
1852	if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
1853		/* we are royally screwed anyway */
1854		return -1;
1855
1856	sigemptyset(&mask);
1857	sigaddset(&mask, SIGALRM);
1858	sigaddset(&mask, SIGHUP);
1859	sigprocmask(SIG_BLOCK, &mask, &omask);
1860	switch ((*pid = fork())) {
1861	case -1:
1862		sigprocmask(SIG_SETMASK, &omask, 0);
1863		close(nulldesc);
1864		return -1;
1865
1866	case 0:
1867		argv[0] = "sh";
1868		argv[1] = "-c";
1869		argv[2] = prog;
1870		argv[3] = NULL;
1871
1872		alarm(0);
1873		(void)setsid();	/* Avoid catching SIGHUPs. */
1874
1875		/*
1876		 * Throw away pending signals, and reset signal
1877		 * behaviour to standard values.
1878		 */
1879		signal(SIGALRM, SIG_IGN);
1880		signal(SIGHUP, SIG_IGN);
1881		sigprocmask(SIG_SETMASK, &omask, 0);
1882		signal(SIGPIPE, SIG_DFL);
1883		signal(SIGQUIT, SIG_DFL);
1884		signal(SIGALRM, SIG_DFL);
1885		signal(SIGHUP, SIG_DFL);
1886
1887		dup2(pfd[0], STDIN_FILENO);
1888		dup2(nulldesc, STDOUT_FILENO);
1889		dup2(nulldesc, STDERR_FILENO);
1890		for (i = getdtablesize(); i > 2; i--)
1891			(void) close(i);
1892
1893		(void) execvp(_PATH_BSHELL, argv);
1894		_exit(255);
1895	}
1896
1897	sigprocmask(SIG_SETMASK, &omask, 0);
1898	close(nulldesc);
1899	close(pfd[0]);
1900	/*
1901	 * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
1902	 * supposed to get an EWOULDBLOCK on writev(2), which is
1903	 * caught by the logic above anyway, which will in turn close
1904	 * the pipe, and fork a new logging subprocess if necessary.
1905	 * The stale subprocess will be killed some time later unless
1906	 * it terminated itself due to closing its input pipe (so we
1907	 * get rid of really dead puppies).
1908	 */
1909	if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
1910		/* This is bad. */
1911		(void)snprintf(errmsg, sizeof errmsg,
1912			       "Warning: cannot change pipe to PID %d to "
1913			       "non-blocking behaviour.",
1914			       (int)*pid);
1915		logerror(errmsg);
1916	}
1917	return pfd[1];
1918}
1919
1920void
1921deadq_enter(pid, name)
1922	pid_t pid;
1923	const char *name;
1924{
1925	dq_t p;
1926	int status;
1927
1928	/*
1929	 * Be paranoid, if we can't signal the process, don't enter it
1930	 * into the dead queue (perhaps it's already dead).  If possible,
1931	 * we try to fetch and log the child's status.
1932	 */
1933	if (kill(pid, 0) != 0) {
1934		if (waitpid(pid, &status, WNOHANG) > 0)
1935			log_deadchild(pid, status, name);
1936		return;
1937	}
1938
1939	p = malloc(sizeof(struct deadq_entry));
1940	if (p == 0) {
1941		errno = 0;
1942		logerror("panic: out of virtual memory!");
1943		exit(1);
1944	}
1945
1946	p->dq_pid = pid;
1947	p->dq_timeout = DQ_TIMO_INIT;
1948	TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
1949}
1950
1951int
1952deadq_remove(pid)
1953	pid_t pid;
1954{
1955	dq_t q;
1956
1957	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
1958		if (q->dq_pid == pid) {
1959			TAILQ_REMOVE(&deadq_head, q, dq_entries);
1960				free(q);
1961				return 1;
1962		}
1963
1964	return 0;
1965}
1966
1967void
1968log_deadchild(pid, status, name)
1969	pid_t pid;
1970	int status;
1971	const char *name;
1972{
1973	int code;
1974	char buf[256];
1975	const char *reason;
1976
1977	errno = 0; /* Keep strerror() stuff out of logerror messages. */
1978	if (WIFSIGNALED(status)) {
1979		reason = "due to signal";
1980		code = WTERMSIG(status);
1981	} else {
1982		reason = "with status";
1983		code = WEXITSTATUS(status);
1984		if (code == 0)
1985			return;
1986	}
1987	(void)snprintf(buf, sizeof buf,
1988		       "Logging subprocess %d (%s) exited %s %d.",
1989		       pid, name, reason, code);
1990	logerror(buf);
1991}
1992