syslogd.c revision 46428 
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	"$Id: syslogd.c,v 1.49 1999/05/02 17:44:16 dt Exp $";
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 */
261u_int	Vogons = 0;		/* packets arriving in SecureMode */
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 *));
274char   *cvthname __P((struct sockaddr_in *));
275void	deadq_enter __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	printline __P((char *, char *));
284void	printsys __P((char *));
285int	p_open __P((char *, pid_t *));
286void	readklog __P((void));
287void	reapchild __P((int));
288char   *ttymsg __P((struct iovec *, int, char *, int));
289static void	usage __P((void));
290int	validate __P((struct sockaddr_in *, const char *));
291void	wallmsg __P((struct filed *, struct iovec *));
292int	waitdaemon __P((int, int, int));
293void	timedout __P((int));
294
295int
296main(argc, argv)
297	int argc;
298	char *argv[];
299{
300	int ch, i, l, len;
301	struct sockaddr_un sunx, fromunix;
302	struct sockaddr_in sin, frominet;
303	FILE *fp;
304	char *p, *hname, line[MAXLINE + 1];
305	struct timeval tv, *tvp;
306	pid_t ppid = 1;
307
308	while ((ch = getopt(argc, argv, "a:dl:f:m:p:suv")) != -1)
309		switch(ch) {
310		case 'd':		/* debug */
311			Debug++;
312			break;
313		case 'a':		/* allow specific network addresses only */
314			if (allowaddr(optarg) == -1)
315				usage();
316			break;
317		case 'f':		/* configuration file */
318			ConfFile = optarg;
319			break;
320		case 'm':		/* mark interval */
321			MarkInterval = atoi(optarg) * 60;
322			break;
323		case 'p':		/* path */
324			funixn[0] = optarg;
325			break;
326		case 's':		/* no network mode */
327			SecureMode++;
328			break;
329		case 'l':
330			if (nfunix < MAXFUNIX)
331				funixn[nfunix++] = optarg;
332			else
333				fprintf(stderr,
334				   "syslogd: out of descriptors, ignoring %s\n",
335					optarg);
336			break;
337		case 'u':		/* only log specified priority */
338		        UniquePriority++;
339			break;
340		case 'v':		/* log facility and priority */
341		  	LogFacPri++;
342			break;
343		case '?':
344		default:
345			usage();
346		}
347	if ((argc -= optind) != 0)
348		usage();
349
350	if (!Debug) {
351		ppid = waitdaemon(0, 0, 30);
352		if (ppid < 0)
353			err(1, "could not become daemon");
354	} else
355		setlinebuf(stdout);
356
357	if (NumAllowed)
358		endservent();
359
360	consfile.f_type = F_CONSOLE;
361	(void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1);
362	(void)gethostname(LocalHostName, sizeof(LocalHostName));
363	if ((p = strchr(LocalHostName, '.')) != NULL) {
364		*p++ = '\0';
365		LocalDomain = p;
366	} else
367		LocalDomain = "";
368	(void)strcpy(bootfile, getbootfile());
369	(void)signal(SIGTERM, die);
370	(void)signal(SIGINT, Debug ? die : SIG_IGN);
371	(void)signal(SIGQUIT, Debug ? die : SIG_IGN);
372	(void)signal(SIGCHLD, reapchild);
373	(void)signal(SIGALRM, domark);
374	(void)signal(SIGPIPE, SIG_IGN);	/* We'll catch EPIPE instead. */
375	(void)alarm(TIMERINTVL);
376
377	TAILQ_INIT(&deadq_head);
378
379#ifndef SUN_LEN
380#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
381#endif
382	for (i = 0; i < nfunix; i++) {
383		memset(&sunx, 0, sizeof(sunx));
384		sunx.sun_family = AF_UNIX;
385		(void)strncpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path));
386		funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0);
387		if (funix[i] < 0 ||
388		    bind(funix[i], (struct sockaddr *)&sunx,
389			 SUN_LEN(&sunx)) < 0 ||
390		    chmod(funixn[i], 0666) < 0) {
391			(void) snprintf(line, sizeof line,
392					"cannot create %s", funixn[i]);
393			logerror(line);
394			dprintf("cannot create %s (%d)\n", funixn[i], errno);
395			if (i == 0)
396				die(0);
397		}
398	}
399	if (SecureMode <= 1)
400		finet = socket(AF_INET, SOCK_DGRAM, 0);
401	if (finet >= 0) {
402		struct servent *sp;
403
404		sp = getservbyname("syslog", "udp");
405		if (sp == NULL) {
406			errno = 0;
407			logerror("syslog/udp: unknown service");
408			die(0);
409		}
410		memset(&sin, 0, sizeof(sin));
411		sin.sin_family = AF_INET;
412		sin.sin_port = LogPort = sp->s_port;
413
414		if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
415			logerror("bind");
416			if (!Debug)
417				die(0);
418		}
419	}
420
421	if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
422		if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
423			fklog = -1;
424	if (fklog < 0)
425		dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
426
427	/* tuck my process id away */
428	fp = fopen(PidFile, "w");
429	if (fp != NULL) {
430		fprintf(fp, "%d\n", getpid());
431		(void) fclose(fp);
432	}
433
434	dprintf("off & running....\n");
435
436	init(0);
437	(void)signal(SIGHUP, init);
438
439	tvp = &tv;
440	tv.tv_sec = tv.tv_usec = 0;
441
442	for (;;) {
443		fd_set readfds;
444		int nfds = 0;
445
446		FD_ZERO(&readfds);
447		if (fklog != -1) {
448			FD_SET(fklog, &readfds);
449			if (fklog > nfds)
450				nfds = fklog;
451		}
452		if (finet != -1) {
453			FD_SET(finet, &readfds);
454			if (finet > nfds)
455				nfds = finet;
456		}
457		for (i = 0; i < nfunix; i++) {
458			if (funix[i] != -1) {
459				FD_SET(funix[i], &readfds);
460				if (funix[i] > nfds)
461					nfds = funix[i];
462			}
463		}
464
465		/*dprintf("readfds = %#x\n", readfds);*/
466		nfds = select(nfds+1, &readfds, (fd_set *)NULL,
467			      (fd_set *)NULL, tvp);
468		if (nfds == 0) {
469			if (tvp) {
470				tvp = NULL;
471				if (ppid != 1)
472					kill(ppid, SIGALRM);
473			}
474			continue;
475		}
476		if (nfds < 0) {
477			if (errno != EINTR)
478				logerror("select");
479			continue;
480		}
481		/*dprintf("got a message (%d, %#x)\n", nfds, readfds);*/
482		if (fklog != -1 && FD_ISSET(fklog, &readfds))
483			readklog();
484		if (finet != -1 && FD_ISSET(finet, &readfds)) {
485			len = sizeof(frominet);
486			l = recvfrom(finet, line, MAXLINE, 0,
487			    (struct sockaddr *)&frominet, &len);
488			if (SecureMode) {
489				Vogons++;
490				if (!(Vogons & (Vogons - 1))) {
491					(void)snprintf(line, sizeof line,
492"syslogd: discarded %d unwanted packets in secure mode, last from %s", Vogons,
493						inet_ntoa(frominet.sin_addr));
494					logmsg(LOG_SYSLOG|LOG_AUTH, line,
495					    LocalHostName, ADDDATE);
496				}
497			} else if (l > 0) {
498				line[l] = '\0';
499				hname = cvthname(&frominet);
500				if (validate(&frominet, hname))
501					printline(hname, line);
502			} else if (l < 0 && errno != EINTR)
503				logerror("recvfrom inet");
504		}
505		for (i = 0; i < nfunix; i++) {
506			if (funix[i] != -1 && FD_ISSET(funix[i], &readfds)) {
507				len = sizeof(fromunix);
508				l = recvfrom(funix[i], line, MAXLINE, 0,
509				    (struct sockaddr *)&fromunix, &len);
510				if (l > 0) {
511					line[l] = '\0';
512					printline(LocalHostName, line);
513				} else if (l < 0 && errno != EINTR)
514					logerror("recvfrom unix");
515			}
516		}
517	}
518}
519
520static void
521usage()
522{
523
524	fprintf(stderr, "%s\n%s\n%s\n",
525		"usage: syslogd [-dsuv] [-a allowed_peer] [-f config_file]",
526		"               [-m mark_interval] [-p log_socket]",
527		"               [-l log_socket]");
528	exit(1);
529}
530
531/*
532 * Take a raw input line, decode the message, and print the message
533 * on the appropriate log files.
534 */
535void
536printline(hname, msg)
537	char *hname;
538	char *msg;
539{
540	int c, pri;
541	char *p, *q, line[MAXLINE + 1];
542
543	/* test for special codes */
544	pri = DEFUPRI;
545	p = msg;
546	if (*p == '<') {
547		pri = 0;
548		while (isdigit(*++p))
549			pri = 10 * pri + (*p - '0');
550		if (*p == '>')
551			++p;
552	}
553	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
554		pri = DEFUPRI;
555
556	/* don't allow users to log kernel messages */
557	if (LOG_FAC(pri) == LOG_KERN)
558		pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
559
560	q = line;
561
562	while ((c = *p++ & 0177) != '\0' &&
563	    q < &line[sizeof(line) - 1])
564		if (iscntrl(c))
565			if (c == '\n')
566				*q++ = ' ';
567			else if (c == '\t')
568				*q++ = '\t';
569			else {
570				*q++ = '^';
571				*q++ = c ^ 0100;
572			}
573		else
574			*q++ = c;
575	*q = '\0';
576
577	logmsg(pri, line, hname, 0);
578}
579
580/*
581 * Read /dev/klog while data are available, split into lines.
582 */
583void
584readklog()
585{
586	char *p, *q, line[MAXLINE + 1];
587	int l, i;
588
589	l = 0;
590	for (;;) {
591		i = read(fklog, line + l, MAXLINE - 1 - l);
592		if (i > 0)
593			line[i + l] = '\0';
594		else if (i < 0 && errno != EINTR && errno != EAGAIN) {
595			logerror("klog");
596			fklog = -1;
597			break;
598		} else
599			break;
600
601		for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
602			*q = '\0';
603			printsys(p);
604		}
605		l = strlen(p);
606		if (l >= MAXLINE - 1) {
607			printsys(p);
608			l = 0;
609		}
610		if (l > 0)
611			memmove(line, p, l + 1);
612	}
613	if (l > 0)
614		printsys(line);
615}
616
617/*
618 * Take a raw input line from /dev/klog, format similar to syslog().
619 */
620void
621printsys(p)
622	char *p;
623{
624	int pri, flags;
625
626	flags = ISKERNEL | SYNC_FILE | ADDDATE;	/* fsync after write */
627	pri = DEFSPRI;
628	if (*p == '<') {
629		pri = 0;
630		while (isdigit(*++p))
631			pri = 10 * pri + (*p - '0');
632		if (*p == '>')
633			++p;
634	} else {
635		/* kernel printf's come out on console */
636		flags |= IGN_CONS;
637	}
638	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
639		pri = DEFSPRI;
640	logmsg(pri, p, LocalHostName, flags);
641}
642
643time_t	now;
644
645/*
646 * Log a message to the appropriate log files, users, etc. based on
647 * the priority.
648 */
649void
650logmsg(pri, msg, from, flags)
651	int pri;
652	char *msg, *from;
653	int flags;
654{
655	struct filed *f;
656	int i, fac, msglen, omask, prilev;
657	char *timestamp;
658 	char prog[NAME_MAX+1];
659	char buf[MAXLINE+1];
660
661	dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
662	    pri, flags, from, msg);
663
664	omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
665
666	/*
667	 * Check to see if msg looks non-standard.
668	 */
669	msglen = strlen(msg);
670	if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
671	    msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
672		flags |= ADDDATE;
673
674	(void)time(&now);
675	if (flags & ADDDATE)
676		timestamp = ctime(&now) + 4;
677	else {
678		timestamp = msg;
679		msg += 16;
680		msglen -= 16;
681	}
682
683	/* skip leading blanks */
684	while(isspace(*msg)) {
685		msg++;
686		msglen--;
687	}
688
689	/* extract facility and priority level */
690	if (flags & MARK)
691		fac = LOG_NFACILITIES;
692	else
693		fac = LOG_FAC(pri);
694	prilev = LOG_PRI(pri);
695
696	/* extract program name */
697	for(i = 0; i < NAME_MAX; i++) {
698		if(!isalnum(msg[i]))
699			break;
700		prog[i] = msg[i];
701	}
702	prog[i] = 0;
703
704	/* add kernel prefix for kernel messages */
705	if (flags & ISKERNEL) {
706		snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg);
707		msg = buf;
708		msglen = strlen(buf);
709	}
710
711	/* log the message to the particular outputs */
712	if (!Initialized) {
713		f = &consfile;
714		f->f_file = open(ctty, O_WRONLY, 0);
715
716		if (f->f_file >= 0) {
717			fprintlog(f, flags, msg);
718			(void)close(f->f_file);
719		}
720		(void)sigsetmask(omask);
721		return;
722	}
723	for (f = Files; f; f = f->f_next) {
724		/* skip messages that are incorrect priority */
725		if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
726		     ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
727		     ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
728		     )
729		    || f->f_pmask[fac] == INTERNAL_NOPRI)
730			continue;
731		/* skip messages with the incorrect program name */
732		if(f->f_program)
733			if(strcmp(prog, f->f_program) != 0)
734				continue;
735
736		if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
737			continue;
738
739		/* don't output marks to recently written files */
740		if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
741			continue;
742
743		/*
744		 * suppress duplicate lines to this file
745		 */
746		if ((flags & MARK) == 0 && msglen == f->f_prevlen &&
747		    !strcmp(msg, f->f_prevline) &&
748		    !strcmp(from, f->f_prevhost)) {
749			(void)strncpy(f->f_lasttime, timestamp, 15);
750			f->f_prevcount++;
751			dprintf("msg repeated %d times, %ld sec of %d\n",
752			    f->f_prevcount, (long)(now - f->f_time),
753			    repeatinterval[f->f_repeatcount]);
754			/*
755			 * If domark would have logged this by now,
756			 * flush it now (so we don't hold isolated messages),
757			 * but back off so we'll flush less often
758			 * in the future.
759			 */
760			if (now > REPEATTIME(f)) {
761				fprintlog(f, flags, (char *)NULL);
762				BACKOFF(f);
763			}
764		} else {
765			/* new line, save it */
766			if (f->f_prevcount)
767				fprintlog(f, 0, (char *)NULL);
768			f->f_repeatcount = 0;
769			f->f_prevpri = pri;
770			(void)strncpy(f->f_lasttime, timestamp, 15);
771			(void)strncpy(f->f_prevhost, from,
772					sizeof(f->f_prevhost)-1);
773			f->f_prevhost[sizeof(f->f_prevhost)-1] = '\0';
774			if (msglen < MAXSVLINE) {
775				f->f_prevlen = msglen;
776				(void)strcpy(f->f_prevline, msg);
777				fprintlog(f, flags, (char *)NULL);
778			} else {
779				f->f_prevline[0] = 0;
780				f->f_prevlen = 0;
781				fprintlog(f, flags, msg);
782			}
783		}
784	}
785	(void)sigsetmask(omask);
786}
787
788void
789fprintlog(f, flags, msg)
790	struct filed *f;
791	int flags;
792	char *msg;
793{
794	struct iovec iov[7];
795	struct iovec *v;
796	int l;
797	char line[MAXLINE + 1], repbuf[80], greetings[200];
798	char *msgret;
799
800	v = iov;
801	if (f->f_type == F_WALL) {
802		v->iov_base = greetings;
803		v->iov_len = snprintf(greetings, sizeof greetings,
804		    "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
805		    f->f_prevhost, ctime(&now));
806		v++;
807		v->iov_base = "";
808		v->iov_len = 0;
809		v++;
810	} else {
811		v->iov_base = f->f_lasttime;
812		v->iov_len = 15;
813		v++;
814		v->iov_base = " ";
815		v->iov_len = 1;
816		v++;
817	}
818
819	if (LogFacPri) {
820	  	static char fp_buf[30];	/* Hollow laugh */
821		int fac = f->f_prevpri & LOG_FACMASK;
822		int pri = LOG_PRI(f->f_prevpri);
823		char *f_s = 0;
824		char f_n[5];	/* Hollow laugh */
825		char *p_s = 0;
826		char p_n[5];	/* Hollow laugh */
827
828		if (LogFacPri > 1) {
829		  CODE *c;
830
831		  for (c = facilitynames; c; c++) {
832		    if (c->c_val == fac) {
833		      f_s = c->c_name;
834		      break;
835		    }
836		  }
837		  for (c = prioritynames; c; c++) {
838		    if (c->c_val == pri) {
839		      p_s = c->c_name;
840		      break;
841		    }
842		  }
843		}
844		if (!f_s) {
845		  snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
846		  f_s = f_n;
847		}
848		if (!p_s) {
849		  snprintf(p_n, sizeof p_n, "%d", pri);
850		  p_s = p_n;
851		}
852		snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
853		v->iov_base = fp_buf;
854		v->iov_len = strlen(fp_buf);
855	} else {
856	        v->iov_base="";
857		v->iov_len = 0;
858	}
859	v++;
860
861	v->iov_base = f->f_prevhost;
862	v->iov_len = strlen(v->iov_base);
863	v++;
864	v->iov_base = " ";
865	v->iov_len = 1;
866	v++;
867
868	if (msg) {
869		v->iov_base = msg;
870		v->iov_len = strlen(msg);
871	} else if (f->f_prevcount > 1) {
872		v->iov_base = repbuf;
873		v->iov_len = sprintf(repbuf, "last message repeated %d times",
874		    f->f_prevcount);
875	} else {
876		v->iov_base = f->f_prevline;
877		v->iov_len = f->f_prevlen;
878	}
879	v++;
880
881	dprintf("Logging to %s", TypeNames[f->f_type]);
882	f->f_time = now;
883
884	switch (f->f_type) {
885	case F_UNUSED:
886		dprintf("\n");
887		break;
888
889	case F_FORW:
890		dprintf(" %s\n", f->f_un.f_forw.f_hname);
891		/* check for local vs remote messages */
892		if (strcmp(f->f_prevhost, LocalHostName))
893			l = snprintf(line, sizeof line - 1,
894			    "<%d>%.15s Forwarded from %s: %s",
895			    f->f_prevpri, iov[0].iov_base, f->f_prevhost,
896			    iov[5].iov_base);
897		else
898			l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
899			     f->f_prevpri, iov[0].iov_base, iov[5].iov_base);
900		if (l > MAXLINE)
901			l = MAXLINE;
902		if ((finet >= 0) &&
903		     (sendto(finet, line, l, 0,
904			     (struct sockaddr *)&f->f_un.f_forw.f_addr,
905			     sizeof(f->f_un.f_forw.f_addr)) != l)) {
906			int e = errno;
907			(void)close(f->f_file);
908			f->f_type = F_UNUSED;
909			errno = e;
910			logerror("sendto");
911		}
912		break;
913
914	case F_FILE:
915		dprintf(" %s\n", f->f_un.f_fname);
916		v->iov_base = "\n";
917		v->iov_len = 1;
918		if (writev(f->f_file, iov, 7) < 0) {
919			int e = errno;
920			(void)close(f->f_file);
921			f->f_type = F_UNUSED;
922			errno = e;
923			logerror(f->f_un.f_fname);
924		} else if (flags & SYNC_FILE)
925			(void)fsync(f->f_file);
926		break;
927
928	case F_PIPE:
929		dprintf(" %s\n", f->f_un.f_pipe.f_pname);
930		v->iov_base = "\n";
931		v->iov_len = 1;
932		if (f->f_un.f_pipe.f_pid == 0) {
933			if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
934						&f->f_un.f_pipe.f_pid)) < 0) {
935				f->f_type = F_UNUSED;
936				logerror(f->f_un.f_pipe.f_pname);
937				break;
938			}
939		}
940		if (writev(f->f_file, iov, 7) < 0) {
941			int e = errno;
942			(void)close(f->f_file);
943			if (f->f_un.f_pipe.f_pid > 0)
944				deadq_enter(f->f_un.f_pipe.f_pid);
945			f->f_un.f_pipe.f_pid = 0;
946			errno = e;
947			logerror(f->f_un.f_pipe.f_pname);
948		}
949		break;
950
951	case F_CONSOLE:
952		if (flags & IGN_CONS) {
953			dprintf(" (ignored)\n");
954			break;
955		}
956		/* FALLTHROUGH */
957
958	case F_TTY:
959		dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
960		v->iov_base = "\r\n";
961		v->iov_len = 2;
962
963		errno = 0;	/* ttymsg() only sometimes returns an errno */
964		if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) {
965			f->f_type = F_UNUSED;
966			logerror(msgret);
967		}
968		break;
969
970	case F_USERS:
971	case F_WALL:
972		dprintf("\n");
973		v->iov_base = "\r\n";
974		v->iov_len = 2;
975		wallmsg(f, iov);
976		break;
977	}
978	f->f_prevcount = 0;
979}
980
981/*
982 *  WALLMSG -- Write a message to the world at large
983 *
984 *	Write the specified message to either the entire
985 *	world, or a list of approved users.
986 */
987void
988wallmsg(f, iov)
989	struct filed *f;
990	struct iovec *iov;
991{
992	static int reenter;			/* avoid calling ourselves */
993	FILE *uf;
994	struct utmp ut;
995	int i;
996	char *p;
997	char line[sizeof(ut.ut_line) + 1];
998
999	if (reenter++)
1000		return;
1001	if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1002		logerror(_PATH_UTMP);
1003		reenter = 0;
1004		return;
1005	}
1006	/* NOSTRICT */
1007	while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1008		if (ut.ut_name[0] == '\0')
1009			continue;
1010		strncpy(line, ut.ut_line, sizeof(ut.ut_line));
1011		line[sizeof(ut.ut_line)] = '\0';
1012		if (f->f_type == F_WALL) {
1013			if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) {
1014				errno = 0;	/* already in msg */
1015				logerror(p);
1016			}
1017			continue;
1018		}
1019		/* should we send the message to this user? */
1020		for (i = 0; i < MAXUNAMES; i++) {
1021			if (!f->f_un.f_uname[i][0])
1022				break;
1023			if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1024			    UT_NAMESIZE)) {
1025				if ((p = ttymsg(iov, 7, line, TTYMSGTIME))
1026								!= NULL) {
1027					errno = 0;	/* already in msg */
1028					logerror(p);
1029				}
1030				break;
1031			}
1032		}
1033	}
1034	(void)fclose(uf);
1035	reenter = 0;
1036}
1037
1038void
1039reapchild(signo)
1040	int signo;
1041{
1042	int status, code;
1043	pid_t pid;
1044	struct filed *f;
1045	char buf[256];
1046	const char *reason;
1047	dq_t q;
1048
1049	while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1050		if (!Initialized)
1051			/* Don't tell while we are initting. */
1052			continue;
1053
1054		/* First, look if it's a process from the dead queue. */
1055		for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
1056			if (q->dq_pid == pid) {
1057				TAILQ_REMOVE(&deadq_head, q, dq_entries);
1058				free(q);
1059				goto oncemore;
1060			}
1061
1062		/* Now, look in list of active processes. */
1063		for (f = Files; f; f = f->f_next)
1064			if (f->f_type == F_PIPE &&
1065			    f->f_un.f_pipe.f_pid == pid) {
1066				(void)close(f->f_file);
1067
1068				errno = 0; /* Keep strerror() stuff out of logerror messages. */
1069				f->f_un.f_pipe.f_pid = 0;
1070				if (WIFSIGNALED(status)) {
1071					reason = "due to signal";
1072					code = WTERMSIG(status);
1073				} else {
1074					reason = "with status";
1075					code = WEXITSTATUS(status);
1076					if (code == 0)
1077						goto oncemore; /* Exited OK. */
1078				}
1079				(void)snprintf(buf, sizeof buf,
1080				"Logging subprocess %d (%s) exited %s %d.",
1081					       pid, f->f_un.f_pipe.f_pname,
1082					       reason, code);
1083				logerror(buf);
1084				break;
1085			}
1086	  oncemore:
1087	}
1088}
1089
1090/*
1091 * Return a printable representation of a host address.
1092 */
1093char *
1094cvthname(f)
1095	struct sockaddr_in *f;
1096{
1097	struct hostent *hp;
1098	sigset_t omask, nmask;
1099	char *p;
1100
1101	dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr));
1102
1103	if (f->sin_family != AF_INET) {
1104		dprintf("Malformed from address\n");
1105		return ("???");
1106	}
1107	sigemptyset(&nmask);
1108	sigaddset(&nmask, SIGHUP);
1109	sigprocmask(SIG_BLOCK, &nmask, &omask);
1110	hp = gethostbyaddr((char *)&f->sin_addr,
1111	    sizeof(struct in_addr), f->sin_family);
1112	sigprocmask(SIG_SETMASK, &omask, NULL);
1113	if (hp == 0) {
1114		dprintf("Host name for your address (%s) unknown\n",
1115			inet_ntoa(f->sin_addr));
1116		return (inet_ntoa(f->sin_addr));
1117	}
1118	if ((p = strchr(hp->h_name, '.')) && strcmp(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			kill(q->dq_pid, SIGKILL);
1153			break;
1154
1155		case 1:
1156			/*
1157			 * Timed out on dead queue, send terminate
1158			 * signal.  Note that we leave the removal
1159			 * from the dead queue to reapchild(), which
1160			 * will also log the event.
1161			 */
1162			kill(q->dq_pid, SIGTERM);
1163			/* FALLTROUGH */
1164
1165		default:
1166			q->dq_timeout--;
1167		}
1168
1169	(void)alarm(TIMERINTVL);
1170}
1171
1172/*
1173 * Print syslogd errors some place.
1174 */
1175void
1176logerror(type)
1177	const char *type;
1178{
1179	char buf[512];
1180
1181	if (errno)
1182		(void)snprintf(buf,
1183		    sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1184	else
1185		(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1186	errno = 0;
1187	dprintf("%s\n", buf);
1188	logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1189}
1190
1191void
1192die(signo)
1193	int signo;
1194{
1195	struct filed *f;
1196	int was_initialized;
1197	char buf[100];
1198	int i;
1199
1200	was_initialized = Initialized;
1201	Initialized = 0;	/* Don't log SIGCHLDs. */
1202	for (f = Files; f != NULL; f = f->f_next) {
1203		/* flush any pending output */
1204		if (f->f_prevcount)
1205			fprintlog(f, 0, (char *)NULL);
1206		if (f->f_type == F_PIPE)
1207			(void)close(f->f_file);
1208	}
1209	Initialized = was_initialized;
1210	if (signo) {
1211		dprintf("syslogd: exiting on signal %d\n", signo);
1212		(void)sprintf(buf, "exiting on signal %d", signo);
1213		errno = 0;
1214		logerror(buf);
1215	}
1216	for (i = 0; i < nfunix; i++)
1217		if (funixn[i] && funix[i] != -1)
1218			(void)unlink(funixn[i]);
1219	exit(1);
1220}
1221
1222/*
1223 *  INIT -- Initialize syslogd from configuration table
1224 */
1225void
1226init(signo)
1227	int signo;
1228{
1229	int i;
1230	FILE *cf;
1231	struct filed *f, *next, **nextp;
1232	char *p;
1233	char cline[LINE_MAX];
1234 	char prog[NAME_MAX+1];
1235
1236	dprintf("init\n");
1237
1238	/*
1239	 *  Close all open log files.
1240	 */
1241	Initialized = 0;
1242	for (f = Files; f != NULL; f = next) {
1243		/* flush any pending output */
1244		if (f->f_prevcount)
1245			fprintlog(f, 0, (char *)NULL);
1246
1247		switch (f->f_type) {
1248		case F_FILE:
1249		case F_FORW:
1250		case F_CONSOLE:
1251		case F_TTY:
1252			(void)close(f->f_file);
1253			break;
1254		case F_PIPE:
1255			(void)close(f->f_file);
1256			if (f->f_un.f_pipe.f_pid > 0)
1257				deadq_enter(f->f_un.f_pipe.f_pid);
1258			f->f_un.f_pipe.f_pid = 0;
1259			break;
1260		}
1261		next = f->f_next;
1262		if(f->f_program) free(f->f_program);
1263		free((char *)f);
1264	}
1265	Files = NULL;
1266	nextp = &Files;
1267
1268	/* open the configuration file */
1269	if ((cf = fopen(ConfFile, "r")) == NULL) {
1270		dprintf("cannot open %s\n", ConfFile);
1271		*nextp = (struct filed *)calloc(1, sizeof(*f));
1272		cfline("*.ERR\t/dev/console", *nextp, "*");
1273		(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1274		cfline("*.PANIC\t*", (*nextp)->f_next, "*");
1275		Initialized = 1;
1276		return;
1277	}
1278
1279	/*
1280	 *  Foreach line in the conf table, open that file.
1281	 */
1282	f = NULL;
1283	strcpy(prog, "*");
1284	while (fgets(cline, sizeof(cline), cf) != NULL) {
1285		/*
1286		 * check for end-of-section, comments, strip off trailing
1287		 * spaces and newline character. #!prog is treated specially:
1288		 * following lines apply only to that program.
1289		 */
1290		for (p = cline; isspace(*p); ++p)
1291			continue;
1292		if (*p == 0)
1293			continue;
1294		if(*p == '#') {
1295			p++;
1296			if(*p!='!')
1297				continue;
1298		}
1299		if(*p=='!') {
1300			p++;
1301			while(isspace(*p)) p++;
1302			if((!*p) || (*p == '*')) {
1303				strcpy(prog, "*");
1304				continue;
1305			}
1306			for(i = 0; i < NAME_MAX; i++) {
1307				if(!isalnum(p[i]))
1308					break;
1309				prog[i] = p[i];
1310			}
1311			prog[i] = 0;
1312			continue;
1313		}
1314		for (p = strchr(cline, '\0'); isspace(*--p);)
1315			continue;
1316		*++p = '\0';
1317		f = (struct filed *)calloc(1, sizeof(*f));
1318		*nextp = f;
1319		nextp = &f->f_next;
1320		cfline(cline, f, prog);
1321	}
1322
1323	/* close the configuration file */
1324	(void)fclose(cf);
1325
1326	Initialized = 1;
1327
1328	if (Debug) {
1329		for (f = Files; f; f = f->f_next) {
1330			for (i = 0; i <= LOG_NFACILITIES; i++)
1331				if (f->f_pmask[i] == INTERNAL_NOPRI)
1332					printf("X ");
1333				else
1334					printf("%d ", f->f_pmask[i]);
1335			printf("%s: ", TypeNames[f->f_type]);
1336			switch (f->f_type) {
1337			case F_FILE:
1338				printf("%s", f->f_un.f_fname);
1339				break;
1340
1341			case F_CONSOLE:
1342			case F_TTY:
1343				printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1344				break;
1345
1346			case F_FORW:
1347				printf("%s", f->f_un.f_forw.f_hname);
1348				break;
1349
1350			case F_PIPE:
1351				printf("%s", f->f_un.f_pipe.f_pname);
1352				break;
1353
1354			case F_USERS:
1355				for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1356					printf("%s, ", f->f_un.f_uname[i]);
1357				break;
1358			}
1359			if(f->f_program) {
1360				printf(" (%s)", f->f_program);
1361			}
1362			printf("\n");
1363		}
1364	}
1365
1366	logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1367	dprintf("syslogd: restarted\n");
1368}
1369
1370/*
1371 * Crack a configuration file line
1372 */
1373void
1374cfline(line, f, prog)
1375	char *line;
1376	struct filed *f;
1377	char *prog;
1378{
1379	struct hostent *hp;
1380	int i, pri;
1381	char *bp, *p, *q;
1382	char buf[MAXLINE], ebuf[100];
1383
1384	dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog);
1385
1386	errno = 0;	/* keep strerror() stuff out of logerror messages */
1387
1388	/* clear out file entry */
1389	memset(f, 0, sizeof(*f));
1390	for (i = 0; i <= LOG_NFACILITIES; i++)
1391		f->f_pmask[i] = INTERNAL_NOPRI;
1392
1393	/* save program name if any */
1394	if(prog && *prog=='*') prog = NULL;
1395	if(prog) {
1396		f->f_program = calloc(1, strlen(prog)+1);
1397		if(f->f_program) {
1398			strcpy(f->f_program, prog);
1399		}
1400	}
1401
1402	/* scan through the list of selectors */
1403	for (p = line; *p && *p != '\t' && *p != ' ';) {
1404		int pri_done;
1405		int pri_cmp;
1406
1407		/* find the end of this facility name list */
1408		for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1409			continue;
1410
1411		/* get the priority comparison */
1412		pri_cmp = 0;
1413		pri_done = 0;
1414		while (!pri_done) {
1415			switch (*q) {
1416			case '<':
1417				pri_cmp |= PRI_LT;
1418				q++;
1419				break;
1420			case '=':
1421				pri_cmp |= PRI_EQ;
1422				q++;
1423				break;
1424			case '>':
1425				pri_cmp |= PRI_GT;
1426				q++;
1427				break;
1428			default:
1429				pri_done++;
1430				break;
1431			}
1432		}
1433		if (!pri_cmp)
1434			pri_cmp = (UniquePriority)
1435				  ? (PRI_EQ)
1436				  : (PRI_EQ | PRI_GT)
1437				  ;
1438
1439		/* collect priority name */
1440		for (bp = buf; *q && !strchr("\t,; ", *q); )
1441			*bp++ = *q++;
1442		*bp = '\0';
1443
1444		/* skip cruft */
1445		while (strchr(",;", *q))
1446			q++;
1447
1448		/* decode priority name */
1449		if (*buf == '*')
1450			pri = LOG_PRIMASK + 1;
1451		else {
1452			pri = decode(buf, prioritynames);
1453			if (pri < 0) {
1454				(void)snprintf(ebuf, sizeof ebuf,
1455				    "unknown priority name \"%s\"", buf);
1456				logerror(ebuf);
1457				return;
1458			}
1459		}
1460
1461		/* scan facilities */
1462		while (*p && !strchr("\t.; ", *p)) {
1463			for (bp = buf; *p && !strchr("\t,;. ", *p); )
1464				*bp++ = *p++;
1465			*bp = '\0';
1466
1467			if (*buf == '*')
1468				for (i = 0; i < LOG_NFACILITIES; i++) {
1469					f->f_pmask[i] = pri;
1470					f->f_pcmp[i] = pri_cmp;
1471				}
1472			else {
1473				i = decode(buf, facilitynames);
1474				if (i < 0) {
1475					(void)snprintf(ebuf, sizeof ebuf,
1476					    "unknown facility name \"%s\"",
1477					    buf);
1478					logerror(ebuf);
1479					return;
1480				}
1481				f->f_pmask[i >> 3] = pri;
1482				f->f_pcmp[i >> 3] = pri_cmp;
1483			}
1484			while (*p == ',' || *p == ' ')
1485				p++;
1486		}
1487
1488		p = q;
1489	}
1490
1491	/* skip to action part */
1492	while (*p == '\t' || *p == ' ')
1493		p++;
1494
1495	switch (*p)
1496	{
1497	case '@':
1498		(void)strncpy(f->f_un.f_forw.f_hname, ++p,
1499			sizeof(f->f_un.f_forw.f_hname)-1);
1500		f->f_un.f_forw.f_hname[sizeof(f->f_un.f_forw.f_hname)-1] = '\0';
1501		hp = gethostbyname(f->f_un.f_forw.f_hname);
1502		if (hp == NULL) {
1503			extern int h_errno;
1504
1505			logerror(hstrerror(h_errno));
1506			break;
1507		}
1508		memset(&f->f_un.f_forw.f_addr, 0,
1509			 sizeof(f->f_un.f_forw.f_addr));
1510		f->f_un.f_forw.f_addr.sin_family = AF_INET;
1511		f->f_un.f_forw.f_addr.sin_port = LogPort;
1512		memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length);
1513		f->f_type = F_FORW;
1514		break;
1515
1516	case '/':
1517		if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
1518			f->f_type = F_UNUSED;
1519			logerror(p);
1520			break;
1521		}
1522		if (isatty(f->f_file)) {
1523			if (strcmp(p, ctty) == 0)
1524				f->f_type = F_CONSOLE;
1525			else
1526				f->f_type = F_TTY;
1527			(void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1);
1528		} else {
1529			(void)strcpy(f->f_un.f_fname, p);
1530			f->f_type = F_FILE;
1531		}
1532		break;
1533
1534	case '|':
1535		f->f_un.f_pipe.f_pid = 0;
1536		(void)strcpy(f->f_un.f_pipe.f_pname, p + 1);
1537		f->f_type = F_PIPE;
1538		break;
1539
1540	case '*':
1541		f->f_type = F_WALL;
1542		break;
1543
1544	default:
1545		for (i = 0; i < MAXUNAMES && *p; i++) {
1546			for (q = p; *q && *q != ','; )
1547				q++;
1548			(void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
1549			if ((q - p) > UT_NAMESIZE)
1550				f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
1551			else
1552				f->f_un.f_uname[i][q - p] = '\0';
1553			while (*q == ',' || *q == ' ')
1554				q++;
1555			p = q;
1556		}
1557		f->f_type = F_USERS;
1558		break;
1559	}
1560}
1561
1562
1563/*
1564 *  Decode a symbolic name to a numeric value
1565 */
1566int
1567decode(name, codetab)
1568	const char *name;
1569	CODE *codetab;
1570{
1571	CODE *c;
1572	char *p, buf[40];
1573
1574	if (isdigit(*name))
1575		return (atoi(name));
1576
1577	for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
1578		if (isupper(*name))
1579			*p = tolower(*name);
1580		else
1581			*p = *name;
1582	}
1583	*p = '\0';
1584	for (c = codetab; c->c_name; c++)
1585		if (!strcmp(buf, c->c_name))
1586			return (c->c_val);
1587
1588	return (-1);
1589}
1590
1591/*
1592 * fork off and become a daemon, but wait for the child to come online
1593 * before returing to the parent, or we get disk thrashing at boot etc.
1594 * Set a timer so we don't hang forever if it wedges.
1595 */
1596int
1597waitdaemon(nochdir, noclose, maxwait)
1598	int nochdir, noclose, maxwait;
1599{
1600	int fd;
1601	int status;
1602	pid_t pid, childpid;
1603
1604	switch (childpid = fork()) {
1605	case -1:
1606		return (-1);
1607	case 0:
1608		break;
1609	default:
1610		signal(SIGALRM, timedout);
1611		alarm(maxwait);
1612		while ((pid = wait3(&status, 0, NULL)) != -1) {
1613			if (WIFEXITED(status))
1614				errx(1, "child pid %d exited with return code %d",
1615					pid, WEXITSTATUS(status));
1616			if (WIFSIGNALED(status))
1617				errx(1, "child pid %d exited on signal %d%s",
1618					pid, WTERMSIG(status),
1619					WCOREDUMP(status) ? " (core dumped)" :
1620					"");
1621			if (pid == childpid)	/* it's gone... */
1622				break;
1623		}
1624		exit(0);
1625	}
1626
1627	if (setsid() == -1)
1628		return (-1);
1629
1630	if (!nochdir)
1631		(void)chdir("/");
1632
1633	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1634		(void)dup2(fd, STDIN_FILENO);
1635		(void)dup2(fd, STDOUT_FILENO);
1636		(void)dup2(fd, STDERR_FILENO);
1637		if (fd > 2)
1638			(void)close (fd);
1639	}
1640	return (getppid());
1641}
1642
1643/*
1644 * We get a SIGALRM from the child when it's running and finished doing it's
1645 * fsync()'s or O_SYNC writes for all the boot messages.
1646 *
1647 * We also get a signal from the kernel if the timer expires, so check to
1648 * see what happened.
1649 */
1650void
1651timedout(sig)
1652	int sig __unused;
1653{
1654	int left;
1655	left = alarm(0);
1656	signal(SIGALRM, SIG_DFL);
1657	if (left == 0)
1658		errx(1, "timed out waiting for child");
1659	else
1660		exit(0);
1661}
1662
1663/*
1664 * Add `s' to the list of allowable peer addresses to accept messages
1665 * from.
1666 *
1667 * `s' is a string in the form:
1668 *
1669 *    [*]domainname[:{servicename|portnumber|*}]
1670 *
1671 * or
1672 *
1673 *    netaddr/maskbits[:{servicename|portnumber|*}]
1674 *
1675 * Returns -1 on error, 0 if the argument was valid.
1676 */
1677int
1678allowaddr(s)
1679	char *s;
1680{
1681	char *cp1, *cp2;
1682	struct allowedpeer ap;
1683	struct servent *se;
1684	regex_t re;
1685	int i;
1686
1687	if ((cp1 = strrchr(s, ':'))) {
1688		/* service/port provided */
1689		*cp1++ = '\0';
1690		if (strlen(cp1) == 1 && *cp1 == '*')
1691			/* any port allowed */
1692			ap.port = htons(0);
1693		else if ((se = getservbyname(cp1, "udp")))
1694			ap.port = se->s_port;
1695		else {
1696			ap.port = htons((int)strtol(cp1, &cp2, 0));
1697			if (*cp2 != '\0')
1698				return -1; /* port not numeric */
1699		}
1700	} else {
1701		if ((se = getservbyname("syslog", "udp")))
1702			ap.port = se->s_port;
1703		else
1704			/* sanity, should not happen */
1705			ap.port = htons(514);
1706	}
1707
1708	/* the regexp's are ugly, but the cleanest way */
1709
1710	if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$",
1711		    REG_EXTENDED))
1712		/* if RE compilation fails, that's an internal error */
1713		abort();
1714	if (regexec(&re, s, 0, 0, 0) == 0) {
1715		/* arg `s' is numeric */
1716		ap.isnumeric = 1;
1717		if ((cp1 = strchr(s, '/')) != NULL) {
1718			*cp1++ = '\0';
1719			i = atoi(cp1);
1720			if (i < 0 || i > 32)
1721				return -1;
1722			/* convert masklen to netmask */
1723			ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1));
1724		}
1725		if (ascii2addr(AF_INET, s, &ap.a_addr) == -1)
1726			return -1;
1727		if (cp1 == NULL) {
1728			/* use default netmask */
1729			if (IN_CLASSA(ntohl(ap.a_addr.s_addr)))
1730				ap.a_mask.s_addr = htonl(IN_CLASSA_NET);
1731			else if (IN_CLASSB(ntohl(ap.a_addr.s_addr)))
1732				ap.a_mask.s_addr = htonl(IN_CLASSB_NET);
1733			else
1734				ap.a_mask.s_addr = htonl(IN_CLASSC_NET);
1735		}
1736	} else {
1737		/* arg `s' is domain name */
1738		ap.isnumeric = 0;
1739		ap.a_name = s;
1740	}
1741	regfree(&re);
1742
1743	if (Debug) {
1744		printf("allowaddr: rule %d: ", NumAllowed);
1745		if (ap.isnumeric) {
1746			printf("numeric, ");
1747			printf("addr = %s, ",
1748			       addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0));
1749			printf("mask = %s; ",
1750			       addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0));
1751		} else
1752			printf("domainname = %s; ", ap.a_name);
1753		printf("port = %d\n", ntohs(ap.port));
1754	}
1755
1756	if ((AllowedPeers = realloc(AllowedPeers,
1757				    ++NumAllowed * sizeof(struct allowedpeer)))
1758	    == NULL) {
1759		fprintf(stderr, "Out of memory!\n");
1760		exit(EX_OSERR);
1761	}
1762	memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
1763	return 0;
1764}
1765
1766/*
1767 * Validate that the remote peer has permission to log to us.
1768 */
1769int
1770validate(sin, hname)
1771	struct sockaddr_in *sin;
1772	const char *hname;
1773{
1774	int i;
1775	size_t l1, l2;
1776	char *cp, name[MAXHOSTNAMELEN];
1777	struct allowedpeer *ap;
1778
1779	if (NumAllowed == 0)
1780		/* traditional behaviour, allow everything */
1781		return 1;
1782
1783	strncpy(name, hname, sizeof name);
1784	if (strchr(name, '.') == NULL) {
1785		strncat(name, ".", sizeof name - strlen(name) - 1);
1786		strncat(name, LocalDomain, sizeof name - strlen(name) - 1);
1787	}
1788	dprintf("validate: dgram from IP %s, port %d, name %s;\n",
1789		addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0),
1790		ntohs(sin->sin_port), name);
1791
1792	/* now, walk down the list */
1793	for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
1794		if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) {
1795			dprintf("rejected in rule %d due to port mismatch.\n", i);
1796			continue;
1797		}
1798
1799		if (ap->isnumeric) {
1800			if ((sin->sin_addr.s_addr & ap->a_mask.s_addr)
1801			    != ap->a_addr.s_addr) {
1802				dprintf("rejected in rule %d due to IP mismatch.\n", i);
1803				continue;
1804			}
1805		} else {
1806			cp = ap->a_name;
1807			l1 = strlen(name);
1808			if (*cp == '*') {
1809				/* allow wildmatch */
1810				cp++;
1811				l2 = strlen(cp);
1812				if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
1813					dprintf("rejected in rule %d due to name mismatch.\n", i);
1814					continue;
1815				}
1816			} else {
1817				/* exact match */
1818				l2 = strlen(cp);
1819				if (l2 != l1 || memcmp(cp, name, l1) != 0) {
1820					dprintf("rejected in rule %d due to name mismatch.\n", i);
1821					continue;
1822				}
1823			}
1824		}
1825		dprintf("accepted in rule %d.\n", i);
1826		return 1;	/* hooray! */
1827	}
1828	return 0;
1829}
1830
1831/*
1832 * Fairly similar to popen(3), but returns an open descriptor, as
1833 * opposed to a FILE *.
1834 */
1835int
1836p_open(prog, pid)
1837	char *prog;
1838	pid_t *pid;
1839{
1840	int pfd[2], nulldesc, i;
1841	sigset_t omask, mask;
1842	char *argv[4]; /* sh -c cmd NULL */
1843	char errmsg[200];
1844
1845	if (pipe(pfd) == -1)
1846		return -1;
1847	if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
1848		/* we are royally screwed anyway */
1849		return -1;
1850
1851	sigemptyset(&mask);
1852	sigaddset(&mask, SIGALRM);
1853	sigaddset(&mask, SIGHUP);
1854	sigprocmask(SIG_BLOCK, &mask, &omask);
1855	switch ((*pid = fork())) {
1856	case -1:
1857		sigprocmask(SIG_SETMASK, &omask, 0);
1858		close(nulldesc);
1859		return -1;
1860
1861	case 0:
1862		argv[0] = "sh";
1863		argv[1] = "-c";
1864		argv[2] = prog;
1865		argv[3] = NULL;
1866
1867		alarm(0);
1868		(void)setsid();	/* Avoid catching SIGHUPs. */
1869
1870		/*
1871		 * Throw away pending signals, and reset signal
1872		 * behaviour to standard values.
1873		 */
1874		signal(SIGALRM, SIG_IGN);
1875		signal(SIGHUP, SIG_IGN);
1876		sigprocmask(SIG_SETMASK, &omask, 0);
1877		signal(SIGPIPE, SIG_DFL);
1878		signal(SIGQUIT, SIG_DFL);
1879		signal(SIGALRM, SIG_DFL);
1880		signal(SIGHUP, SIG_DFL);
1881
1882		dup2(pfd[0], STDIN_FILENO);
1883		dup2(nulldesc, STDOUT_FILENO);
1884		dup2(nulldesc, STDERR_FILENO);
1885		for (i = getdtablesize(); i > 2; i--)
1886			(void) close(i);
1887
1888		(void) execvp(_PATH_BSHELL, argv);
1889		_exit(255);
1890	}
1891
1892	sigprocmask(SIG_SETMASK, &omask, 0);
1893	close(nulldesc);
1894	close(pfd[0]);
1895	/*
1896	 * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
1897	 * supposed to get an EWOULDBLOCK on writev(2), which is
1898	 * caught by the logic above anyway, which will in turn close
1899	 * the pipe, and fork a new logging subprocess if necessary.
1900	 * The stale subprocess will be killed some time later unless
1901	 * it terminated itself due to closing its input pipe (so we
1902	 * get rid of really dead puppies).
1903	 */
1904	if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
1905		/* This is bad. */
1906		(void)snprintf(errmsg, sizeof errmsg,
1907			       "Warning: cannot change pipe to PID %d to "
1908			       "non-blocking behaviour.",
1909			       (int)*pid);
1910		logerror(errmsg);
1911	}
1912	return pfd[1];
1913}
1914
1915void
1916deadq_enter(pid)
1917	pid_t pid;
1918{
1919	dq_t p;
1920
1921	p = malloc(sizeof(struct deadq_entry));
1922	if (p == 0) {
1923		errno = 0;
1924		logerror("panic: out of virtual memory!");
1925		exit(1);
1926	}
1927
1928	p->dq_pid = pid;
1929	p->dq_timeout = DQ_TIMO_INIT;
1930	TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
1931}
1932