syslogd.c revision 60938 
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 60938 2000-05-26 02:09:24Z jake $";
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 = (unsigned char)*p++) != '\0' &&
581	    q < &line[sizeof(line) - 3]) {
582		if ((c & 0x80) && c < 0xA0) {
583			c &= 0x7F;
584			*q++ = 'M';
585			*q++ = '-';
586		}
587		if (isascii(c) && iscntrl(c)) {
588			if (c == '\n')
589				*q++ = ' ';
590			else if (c == '\t')
591				*q++ = '\t';
592			else {
593				*q++ = '^';
594				*q++ = c ^ 0100;
595			}
596		} else
597			*q++ = c;
598	}
599	*q = '\0';
600
601	logmsg(pri, line, hname, 0);
602}
603
604/*
605 * Read /dev/klog while data are available, split into lines.
606 */
607void
608readklog()
609{
610	char *p, *q, line[MAXLINE + 1];
611	int len, i;
612
613	len = 0;
614	for (;;) {
615		i = read(fklog, line + len, MAXLINE - 1 - len);
616		if (i > 0)
617			line[i + len] = '\0';
618		else if (i < 0 && errno != EINTR && errno != EAGAIN) {
619			logerror("klog");
620			fklog = -1;
621			break;
622		} else
623			break;
624
625		for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
626			*q = '\0';
627			printsys(p);
628		}
629		len = strlen(p);
630		if (len >= MAXLINE - 1) {
631			printsys(p);
632			len = 0;
633		}
634		if (len > 0)
635			memmove(line, p, len + 1);
636	}
637	if (len > 0)
638		printsys(line);
639}
640
641/*
642 * Take a raw input line from /dev/klog, format similar to syslog().
643 */
644void
645printsys(p)
646	char *p;
647{
648	int pri, flags;
649
650	flags = ISKERNEL | SYNC_FILE | ADDDATE;	/* fsync after write */
651	pri = DEFSPRI;
652	if (*p == '<') {
653		pri = 0;
654		while (isdigit(*++p))
655			pri = 10 * pri + (*p - '0');
656		if (*p == '>')
657			++p;
658	} else {
659		/* kernel printf's come out on console */
660		flags |= IGN_CONS;
661	}
662	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
663		pri = DEFSPRI;
664	logmsg(pri, p, LocalHostName, flags);
665}
666
667time_t	now;
668
669/*
670 * Log a message to the appropriate log files, users, etc. based on
671 * the priority.
672 */
673void
674logmsg(pri, msg, from, flags)
675	int pri;
676	char *msg, *from;
677	int flags;
678{
679	struct filed *f;
680	int i, fac, msglen, omask, prilev;
681	char *timestamp;
682 	char prog[NAME_MAX+1];
683	char buf[MAXLINE+1];
684
685	dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
686	    pri, flags, from, msg);
687
688	omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
689
690	/*
691	 * Check to see if msg looks non-standard.
692	 */
693	msglen = strlen(msg);
694	if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
695	    msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
696		flags |= ADDDATE;
697
698	(void)time(&now);
699	if (flags & ADDDATE)
700		timestamp = ctime(&now) + 4;
701	else {
702		timestamp = msg;
703		msg += 16;
704		msglen -= 16;
705	}
706
707	/* skip leading blanks */
708	while(isspace(*msg)) {
709		msg++;
710		msglen--;
711	}
712
713	/* extract facility and priority level */
714	if (flags & MARK)
715		fac = LOG_NFACILITIES;
716	else
717		fac = LOG_FAC(pri);
718	prilev = LOG_PRI(pri);
719
720	/* extract program name */
721	for(i = 0; i < NAME_MAX; i++) {
722		if(!isalnum(msg[i]))
723			break;
724		prog[i] = msg[i];
725	}
726	prog[i] = 0;
727
728	/* add kernel prefix for kernel messages */
729	if (flags & ISKERNEL) {
730		snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg);
731		msg = buf;
732		msglen = strlen(buf);
733	}
734
735	/* log the message to the particular outputs */
736	if (!Initialized) {
737		f = &consfile;
738		f->f_file = open(ctty, O_WRONLY, 0);
739
740		if (f->f_file >= 0) {
741			fprintlog(f, flags, msg);
742			(void)close(f->f_file);
743		}
744		(void)sigsetmask(omask);
745		return;
746	}
747	for (f = Files; f; f = f->f_next) {
748		/* skip messages that are incorrect priority */
749		if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
750		     ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
751		     ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
752		     )
753		    || f->f_pmask[fac] == INTERNAL_NOPRI)
754			continue;
755		/* skip messages with the incorrect program name */
756		if(f->f_program)
757			if(strcmp(prog, f->f_program) != 0)
758				continue;
759
760		if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
761			continue;
762
763		/* don't output marks to recently written files */
764		if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
765			continue;
766
767		/*
768		 * suppress duplicate lines to this file
769		 */
770		if ((flags & MARK) == 0 && msglen == f->f_prevlen &&
771		    !strcmp(msg, f->f_prevline) &&
772		    !strcasecmp(from, f->f_prevhost)) {
773			(void)strncpy(f->f_lasttime, timestamp, 15);
774			f->f_prevcount++;
775			dprintf("msg repeated %d times, %ld sec of %d\n",
776			    f->f_prevcount, (long)(now - f->f_time),
777			    repeatinterval[f->f_repeatcount]);
778			/*
779			 * If domark would have logged this by now,
780			 * flush it now (so we don't hold isolated messages),
781			 * but back off so we'll flush less often
782			 * in the future.
783			 */
784			if (now > REPEATTIME(f)) {
785				fprintlog(f, flags, (char *)NULL);
786				BACKOFF(f);
787			}
788		} else {
789			/* new line, save it */
790			if (f->f_prevcount)
791				fprintlog(f, 0, (char *)NULL);
792			f->f_repeatcount = 0;
793			f->f_prevpri = pri;
794			(void)strncpy(f->f_lasttime, timestamp, 15);
795			(void)strncpy(f->f_prevhost, from,
796					sizeof(f->f_prevhost)-1);
797			f->f_prevhost[sizeof(f->f_prevhost)-1] = '\0';
798			if (msglen < MAXSVLINE) {
799				f->f_prevlen = msglen;
800				(void)strcpy(f->f_prevline, msg);
801				fprintlog(f, flags, (char *)NULL);
802			} else {
803				f->f_prevline[0] = 0;
804				f->f_prevlen = 0;
805				fprintlog(f, flags, msg);
806			}
807		}
808	}
809	(void)sigsetmask(omask);
810}
811
812void
813fprintlog(f, flags, msg)
814	struct filed *f;
815	int flags;
816	char *msg;
817{
818	struct iovec iov[7];
819	struct iovec *v;
820	int l;
821	char line[MAXLINE + 1], repbuf[80], greetings[200];
822	char *msgret;
823
824	v = iov;
825	if (f->f_type == F_WALL) {
826		v->iov_base = greetings;
827		v->iov_len = snprintf(greetings, sizeof greetings,
828		    "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
829		    f->f_prevhost, ctime(&now));
830		v++;
831		v->iov_base = "";
832		v->iov_len = 0;
833		v++;
834	} else {
835		v->iov_base = f->f_lasttime;
836		v->iov_len = 15;
837		v++;
838		v->iov_base = " ";
839		v->iov_len = 1;
840		v++;
841	}
842
843	if (LogFacPri) {
844	  	static char fp_buf[30];	/* Hollow laugh */
845		int fac = f->f_prevpri & LOG_FACMASK;
846		int pri = LOG_PRI(f->f_prevpri);
847		char *f_s = 0;
848		char f_n[5];	/* Hollow laugh */
849		char *p_s = 0;
850		char p_n[5];	/* Hollow laugh */
851
852		if (LogFacPri > 1) {
853		  CODE *c;
854
855		  for (c = facilitynames; c->c_name; c++) {
856		    if (c->c_val == fac) {
857		      f_s = c->c_name;
858		      break;
859		    }
860		  }
861		  for (c = prioritynames; c->c_name; c++) {
862		    if (c->c_val == pri) {
863		      p_s = c->c_name;
864		      break;
865		    }
866		  }
867		}
868		if (!f_s) {
869		  snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
870		  f_s = f_n;
871		}
872		if (!p_s) {
873		  snprintf(p_n, sizeof p_n, "%d", pri);
874		  p_s = p_n;
875		}
876		snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
877		v->iov_base = fp_buf;
878		v->iov_len = strlen(fp_buf);
879	} else {
880	        v->iov_base="";
881		v->iov_len = 0;
882	}
883	v++;
884
885	v->iov_base = f->f_prevhost;
886	v->iov_len = strlen(v->iov_base);
887	v++;
888	v->iov_base = " ";
889	v->iov_len = 1;
890	v++;
891
892	if (msg) {
893		v->iov_base = msg;
894		v->iov_len = strlen(msg);
895	} else if (f->f_prevcount > 1) {
896		v->iov_base = repbuf;
897		v->iov_len = sprintf(repbuf, "last message repeated %d times",
898		    f->f_prevcount);
899	} else {
900		v->iov_base = f->f_prevline;
901		v->iov_len = f->f_prevlen;
902	}
903	v++;
904
905	dprintf("Logging to %s", TypeNames[f->f_type]);
906	f->f_time = now;
907
908	switch (f->f_type) {
909	case F_UNUSED:
910		dprintf("\n");
911		break;
912
913	case F_FORW:
914		dprintf(" %s\n", f->f_un.f_forw.f_hname);
915		/* check for local vs remote messages */
916		if (strcasecmp(f->f_prevhost, LocalHostName))
917			l = snprintf(line, sizeof line - 1,
918			    "<%d>%.15s Forwarded from %s: %s",
919			    f->f_prevpri, iov[0].iov_base, f->f_prevhost,
920			    iov[5].iov_base);
921		else
922			l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
923			     f->f_prevpri, iov[0].iov_base, iov[5].iov_base);
924		if (l > MAXLINE)
925			l = MAXLINE;
926		if ((finet >= 0) &&
927		     (sendto(finet, line, l, 0,
928			     (struct sockaddr *)&f->f_un.f_forw.f_addr,
929			     sizeof(f->f_un.f_forw.f_addr)) != l)) {
930			int e = errno;
931			(void)close(f->f_file);
932			f->f_type = F_UNUSED;
933			errno = e;
934			logerror("sendto");
935		}
936		break;
937
938	case F_FILE:
939		dprintf(" %s\n", f->f_un.f_fname);
940		v->iov_base = "\n";
941		v->iov_len = 1;
942		if (writev(f->f_file, iov, 7) < 0) {
943			int e = errno;
944			(void)close(f->f_file);
945			f->f_type = F_UNUSED;
946			errno = e;
947			logerror(f->f_un.f_fname);
948		} else if (flags & SYNC_FILE)
949			(void)fsync(f->f_file);
950		break;
951
952	case F_PIPE:
953		dprintf(" %s\n", f->f_un.f_pipe.f_pname);
954		v->iov_base = "\n";
955		v->iov_len = 1;
956		if (f->f_un.f_pipe.f_pid == 0) {
957			if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
958						&f->f_un.f_pipe.f_pid)) < 0) {
959				f->f_type = F_UNUSED;
960				logerror(f->f_un.f_pipe.f_pname);
961				break;
962			}
963		}
964		if (writev(f->f_file, iov, 7) < 0) {
965			int e = errno;
966			(void)close(f->f_file);
967			if (f->f_un.f_pipe.f_pid > 0)
968				deadq_enter(f->f_un.f_pipe.f_pid,
969					    f->f_un.f_pipe.f_pname);
970			f->f_un.f_pipe.f_pid = 0;
971			errno = e;
972			logerror(f->f_un.f_pipe.f_pname);
973		}
974		break;
975
976	case F_CONSOLE:
977		if (flags & IGN_CONS) {
978			dprintf(" (ignored)\n");
979			break;
980		}
981		/* FALLTHROUGH */
982
983	case F_TTY:
984		dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
985		v->iov_base = "\r\n";
986		v->iov_len = 2;
987
988		errno = 0;	/* ttymsg() only sometimes returns an errno */
989		if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) {
990			f->f_type = F_UNUSED;
991			logerror(msgret);
992		}
993		break;
994
995	case F_USERS:
996	case F_WALL:
997		dprintf("\n");
998		v->iov_base = "\r\n";
999		v->iov_len = 2;
1000		wallmsg(f, iov);
1001		break;
1002	}
1003	f->f_prevcount = 0;
1004}
1005
1006/*
1007 *  WALLMSG -- Write a message to the world at large
1008 *
1009 *	Write the specified message to either the entire
1010 *	world, or a list of approved users.
1011 */
1012void
1013wallmsg(f, iov)
1014	struct filed *f;
1015	struct iovec *iov;
1016{
1017	static int reenter;			/* avoid calling ourselves */
1018	FILE *uf;
1019	struct utmp ut;
1020	int i;
1021	char *p;
1022	char line[sizeof(ut.ut_line) + 1];
1023
1024	if (reenter++)
1025		return;
1026	if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1027		logerror(_PATH_UTMP);
1028		reenter = 0;
1029		return;
1030	}
1031	/* NOSTRICT */
1032	while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1033		if (ut.ut_name[0] == '\0')
1034			continue;
1035		strncpy(line, ut.ut_line, sizeof(ut.ut_line));
1036		line[sizeof(ut.ut_line)] = '\0';
1037		if (f->f_type == F_WALL) {
1038			if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) {
1039				errno = 0;	/* already in msg */
1040				logerror(p);
1041			}
1042			continue;
1043		}
1044		/* should we send the message to this user? */
1045		for (i = 0; i < MAXUNAMES; i++) {
1046			if (!f->f_un.f_uname[i][0])
1047				break;
1048			if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1049			    UT_NAMESIZE)) {
1050				if ((p = ttymsg(iov, 7, line, TTYMSGTIME))
1051								!= NULL) {
1052					errno = 0;	/* already in msg */
1053					logerror(p);
1054				}
1055				break;
1056			}
1057		}
1058	}
1059	(void)fclose(uf);
1060	reenter = 0;
1061}
1062
1063void
1064reapchild(signo)
1065	int signo;
1066{
1067	int status;
1068	pid_t pid;
1069	struct filed *f;
1070
1071	while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1072		if (!Initialized)
1073			/* Don't tell while we are initting. */
1074			continue;
1075
1076		/* First, look if it's a process from the dead queue. */
1077		if (deadq_remove(pid))
1078			goto oncemore;
1079
1080		/* Now, look in list of active processes. */
1081		for (f = Files; f; f = f->f_next)
1082			if (f->f_type == F_PIPE &&
1083			    f->f_un.f_pipe.f_pid == pid) {
1084				(void)close(f->f_file);
1085				f->f_un.f_pipe.f_pid = 0;
1086				log_deadchild(pid, status,
1087					      f->f_un.f_pipe.f_pname);
1088				break;
1089			}
1090	  oncemore:
1091		continue;
1092	}
1093}
1094
1095/*
1096 * Return a printable representation of a host address.
1097 */
1098char *
1099cvthname(f)
1100	struct sockaddr_in *f;
1101{
1102	struct hostent *hp;
1103	sigset_t omask, nmask;
1104	char *p;
1105
1106	dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr));
1107
1108	if (f->sin_family != AF_INET) {
1109		dprintf("Malformed from address\n");
1110		return ("???");
1111	}
1112	sigemptyset(&nmask);
1113	sigaddset(&nmask, SIGHUP);
1114	sigprocmask(SIG_BLOCK, &nmask, &omask);
1115	hp = gethostbyaddr((char *)&f->sin_addr,
1116	    sizeof(struct in_addr), f->sin_family);
1117	sigprocmask(SIG_SETMASK, &omask, NULL);
1118	if (hp == 0) {
1119		dprintf("Host name for your address (%s) unknown\n",
1120			inet_ntoa(f->sin_addr));
1121		return (inet_ntoa(f->sin_addr));
1122	}
1123	if ((p = strchr(hp->h_name, '.')) &&
1124	    strcasecmp(p + 1, LocalDomain) == 0)
1125		*p = '\0';
1126	return (hp->h_name);
1127}
1128
1129void
1130domark(signo)
1131	int signo;
1132{
1133	struct filed *f;
1134	dq_t q;
1135
1136	now = time((time_t *)NULL);
1137	MarkSeq += TIMERINTVL;
1138	if (MarkSeq >= MarkInterval) {
1139		logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK);
1140		MarkSeq = 0;
1141	}
1142
1143	for (f = Files; f; f = f->f_next) {
1144		if (f->f_prevcount && now >= REPEATTIME(f)) {
1145			dprintf("flush %s: repeated %d times, %d sec.\n",
1146			    TypeNames[f->f_type], f->f_prevcount,
1147			    repeatinterval[f->f_repeatcount]);
1148			fprintlog(f, 0, (char *)NULL);
1149			BACKOFF(f);
1150		}
1151	}
1152
1153	/* Walk the dead queue, and see if we should signal somebody. */
1154	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
1155		switch (q->dq_timeout) {
1156		case 0:
1157			/* Already signalled once, try harder now. */
1158			if (kill(q->dq_pid, SIGKILL) != 0)
1159				(void)deadq_remove(q->dq_pid);
1160			break;
1161
1162		case 1:
1163			/*
1164			 * Timed out on dead queue, send terminate
1165			 * signal.  Note that we leave the removal
1166			 * from the dead queue to reapchild(), which
1167			 * will also log the event (unless the process
1168			 * didn't even really exist, in case we simply
1169			 * drop it from the dead queue).
1170			 */
1171			if (kill(q->dq_pid, SIGTERM) != 0)
1172				(void)deadq_remove(q->dq_pid);
1173			/* FALLTHROUGH */
1174
1175		default:
1176			q->dq_timeout--;
1177		}
1178
1179	(void)alarm(TIMERINTVL);
1180}
1181
1182/*
1183 * Print syslogd errors some place.
1184 */
1185void
1186logerror(type)
1187	const char *type;
1188{
1189	char buf[512];
1190
1191	if (errno)
1192		(void)snprintf(buf,
1193		    sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1194	else
1195		(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1196	errno = 0;
1197	dprintf("%s\n", buf);
1198	logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1199}
1200
1201void
1202die(signo)
1203	int signo;
1204{
1205	struct filed *f;
1206	int was_initialized;
1207	char buf[100];
1208	int i;
1209
1210	was_initialized = Initialized;
1211	Initialized = 0;	/* Don't log SIGCHLDs. */
1212	for (f = Files; f != NULL; f = f->f_next) {
1213		/* flush any pending output */
1214		if (f->f_prevcount)
1215			fprintlog(f, 0, (char *)NULL);
1216		if (f->f_type == F_PIPE)
1217			(void)close(f->f_file);
1218	}
1219	Initialized = was_initialized;
1220	if (signo) {
1221		dprintf("syslogd: exiting on signal %d\n", signo);
1222		(void)sprintf(buf, "exiting on signal %d", signo);
1223		errno = 0;
1224		logerror(buf);
1225	}
1226	for (i = 0; i < nfunix; i++)
1227		if (funixn[i] && funix[i] != -1)
1228			(void)unlink(funixn[i]);
1229	exit(1);
1230}
1231
1232/*
1233 *  INIT -- Initialize syslogd from configuration table
1234 */
1235void
1236init(signo)
1237	int signo;
1238{
1239	int i;
1240	FILE *cf;
1241	struct filed *f, *next, **nextp;
1242	char *p;
1243	char cline[LINE_MAX];
1244 	char prog[NAME_MAX+1];
1245
1246	dprintf("init\n");
1247
1248	/*
1249	 *  Close all open log files.
1250	 */
1251	Initialized = 0;
1252	for (f = Files; f != NULL; f = next) {
1253		/* flush any pending output */
1254		if (f->f_prevcount)
1255			fprintlog(f, 0, (char *)NULL);
1256
1257		switch (f->f_type) {
1258		case F_FILE:
1259		case F_FORW:
1260		case F_CONSOLE:
1261		case F_TTY:
1262			(void)close(f->f_file);
1263			break;
1264		case F_PIPE:
1265			(void)close(f->f_file);
1266			if (f->f_un.f_pipe.f_pid > 0)
1267				deadq_enter(f->f_un.f_pipe.f_pid,
1268					    f->f_un.f_pipe.f_pname);
1269			f->f_un.f_pipe.f_pid = 0;
1270			break;
1271		}
1272		next = f->f_next;
1273		if(f->f_program) free(f->f_program);
1274		free((char *)f);
1275	}
1276	Files = NULL;
1277	nextp = &Files;
1278
1279	/* open the configuration file */
1280	if ((cf = fopen(ConfFile, "r")) == NULL) {
1281		dprintf("cannot open %s\n", ConfFile);
1282		*nextp = (struct filed *)calloc(1, sizeof(*f));
1283		cfline("*.ERR\t/dev/console", *nextp, "*");
1284		(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1285		cfline("*.PANIC\t*", (*nextp)->f_next, "*");
1286		Initialized = 1;
1287		return;
1288	}
1289
1290	/*
1291	 *  Foreach line in the conf table, open that file.
1292	 */
1293	f = NULL;
1294	strcpy(prog, "*");
1295	while (fgets(cline, sizeof(cline), cf) != NULL) {
1296		/*
1297		 * check for end-of-section, comments, strip off trailing
1298		 * spaces and newline character. #!prog is treated specially:
1299		 * following lines apply only to that program.
1300		 */
1301		for (p = cline; isspace(*p); ++p)
1302			continue;
1303		if (*p == 0)
1304			continue;
1305		if(*p == '#') {
1306			p++;
1307			if(*p!='!')
1308				continue;
1309		}
1310		if(*p=='!') {
1311			p++;
1312			while(isspace(*p)) p++;
1313			if((!*p) || (*p == '*')) {
1314				strcpy(prog, "*");
1315				continue;
1316			}
1317			for(i = 0; i < NAME_MAX; i++) {
1318				if(!isalnum(p[i]))
1319					break;
1320				prog[i] = p[i];
1321			}
1322			prog[i] = 0;
1323			continue;
1324		}
1325		for (p = strchr(cline, '\0'); isspace(*--p);)
1326			continue;
1327		*++p = '\0';
1328		f = (struct filed *)calloc(1, sizeof(*f));
1329		*nextp = f;
1330		nextp = &f->f_next;
1331		cfline(cline, f, prog);
1332	}
1333
1334	/* close the configuration file */
1335	(void)fclose(cf);
1336
1337	Initialized = 1;
1338
1339	if (Debug) {
1340		for (f = Files; f; f = f->f_next) {
1341			for (i = 0; i <= LOG_NFACILITIES; i++)
1342				if (f->f_pmask[i] == INTERNAL_NOPRI)
1343					printf("X ");
1344				else
1345					printf("%d ", f->f_pmask[i]);
1346			printf("%s: ", TypeNames[f->f_type]);
1347			switch (f->f_type) {
1348			case F_FILE:
1349				printf("%s", f->f_un.f_fname);
1350				break;
1351
1352			case F_CONSOLE:
1353			case F_TTY:
1354				printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1355				break;
1356
1357			case F_FORW:
1358				printf("%s", f->f_un.f_forw.f_hname);
1359				break;
1360
1361			case F_PIPE:
1362				printf("%s", f->f_un.f_pipe.f_pname);
1363				break;
1364
1365			case F_USERS:
1366				for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1367					printf("%s, ", f->f_un.f_uname[i]);
1368				break;
1369			}
1370			if(f->f_program) {
1371				printf(" (%s)", f->f_program);
1372			}
1373			printf("\n");
1374		}
1375	}
1376
1377	logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1378	dprintf("syslogd: restarted\n");
1379}
1380
1381/*
1382 * Crack a configuration file line
1383 */
1384void
1385cfline(line, f, prog)
1386	char *line;
1387	struct filed *f;
1388	char *prog;
1389{
1390	struct hostent *hp;
1391	int i, pri;
1392	char *bp, *p, *q;
1393	char buf[MAXLINE], ebuf[100];
1394
1395	dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog);
1396
1397	errno = 0;	/* keep strerror() stuff out of logerror messages */
1398
1399	/* clear out file entry */
1400	memset(f, 0, sizeof(*f));
1401	for (i = 0; i <= LOG_NFACILITIES; i++)
1402		f->f_pmask[i] = INTERNAL_NOPRI;
1403
1404	/* save program name if any */
1405	if(prog && *prog=='*') prog = NULL;
1406	if(prog) {
1407		f->f_program = calloc(1, strlen(prog)+1);
1408		if(f->f_program) {
1409			strcpy(f->f_program, prog);
1410		}
1411	}
1412
1413	/* scan through the list of selectors */
1414	for (p = line; *p && *p != '\t' && *p != ' ';) {
1415		int pri_done;
1416		int pri_cmp;
1417
1418		/* find the end of this facility name list */
1419		for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1420			continue;
1421
1422		/* get the priority comparison */
1423		pri_cmp = 0;
1424		pri_done = 0;
1425		while (!pri_done) {
1426			switch (*q) {
1427			case '<':
1428				pri_cmp |= PRI_LT;
1429				q++;
1430				break;
1431			case '=':
1432				pri_cmp |= PRI_EQ;
1433				q++;
1434				break;
1435			case '>':
1436				pri_cmp |= PRI_GT;
1437				q++;
1438				break;
1439			default:
1440				pri_done++;
1441				break;
1442			}
1443		}
1444		if (!pri_cmp)
1445			pri_cmp = (UniquePriority)
1446				  ? (PRI_EQ)
1447				  : (PRI_EQ | PRI_GT)
1448				  ;
1449
1450		/* collect priority name */
1451		for (bp = buf; *q && !strchr("\t,; ", *q); )
1452			*bp++ = *q++;
1453		*bp = '\0';
1454
1455		/* skip cruft */
1456		while (strchr(",;", *q))
1457			q++;
1458
1459		/* decode priority name */
1460		if (*buf == '*')
1461			pri = LOG_PRIMASK + 1;
1462		else {
1463			pri = decode(buf, prioritynames);
1464			if (pri < 0) {
1465				(void)snprintf(ebuf, sizeof ebuf,
1466				    "unknown priority name \"%s\"", buf);
1467				logerror(ebuf);
1468				return;
1469			}
1470		}
1471
1472		/* scan facilities */
1473		while (*p && !strchr("\t.; ", *p)) {
1474			for (bp = buf; *p && !strchr("\t,;. ", *p); )
1475				*bp++ = *p++;
1476			*bp = '\0';
1477
1478			if (*buf == '*')
1479				for (i = 0; i < LOG_NFACILITIES; i++) {
1480					f->f_pmask[i] = pri;
1481					f->f_pcmp[i] = pri_cmp;
1482				}
1483			else {
1484				i = decode(buf, facilitynames);
1485				if (i < 0) {
1486					(void)snprintf(ebuf, sizeof ebuf,
1487					    "unknown facility name \"%s\"",
1488					    buf);
1489					logerror(ebuf);
1490					return;
1491				}
1492				f->f_pmask[i >> 3] = pri;
1493				f->f_pcmp[i >> 3] = pri_cmp;
1494			}
1495			while (*p == ',' || *p == ' ')
1496				p++;
1497		}
1498
1499		p = q;
1500	}
1501
1502	/* skip to action part */
1503	while (*p == '\t' || *p == ' ')
1504		p++;
1505
1506	switch (*p)
1507	{
1508	case '@':
1509		(void)strncpy(f->f_un.f_forw.f_hname, ++p,
1510			sizeof(f->f_un.f_forw.f_hname)-1);
1511		f->f_un.f_forw.f_hname[sizeof(f->f_un.f_forw.f_hname)-1] = '\0';
1512		hp = gethostbyname(f->f_un.f_forw.f_hname);
1513		if (hp == NULL) {
1514			extern int h_errno;
1515
1516			logerror(hstrerror(h_errno));
1517			break;
1518		}
1519		memset(&f->f_un.f_forw.f_addr, 0,
1520			 sizeof(f->f_un.f_forw.f_addr));
1521		f->f_un.f_forw.f_addr.sin_family = AF_INET;
1522		f->f_un.f_forw.f_addr.sin_port = LogPort;
1523		memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length);
1524		f->f_type = F_FORW;
1525		break;
1526
1527	case '/':
1528		if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
1529			f->f_type = F_UNUSED;
1530			logerror(p);
1531			break;
1532		}
1533		if (isatty(f->f_file)) {
1534			if (strcmp(p, ctty) == 0)
1535				f->f_type = F_CONSOLE;
1536			else
1537				f->f_type = F_TTY;
1538			(void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1);
1539		} else {
1540			(void)strcpy(f->f_un.f_fname, p);
1541			f->f_type = F_FILE;
1542		}
1543		break;
1544
1545	case '|':
1546		f->f_un.f_pipe.f_pid = 0;
1547		(void)strcpy(f->f_un.f_pipe.f_pname, p + 1);
1548		f->f_type = F_PIPE;
1549		break;
1550
1551	case '*':
1552		f->f_type = F_WALL;
1553		break;
1554
1555	default:
1556		for (i = 0; i < MAXUNAMES && *p; i++) {
1557			for (q = p; *q && *q != ','; )
1558				q++;
1559			(void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
1560			if ((q - p) > UT_NAMESIZE)
1561				f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
1562			else
1563				f->f_un.f_uname[i][q - p] = '\0';
1564			while (*q == ',' || *q == ' ')
1565				q++;
1566			p = q;
1567		}
1568		f->f_type = F_USERS;
1569		break;
1570	}
1571}
1572
1573
1574/*
1575 *  Decode a symbolic name to a numeric value
1576 */
1577int
1578decode(name, codetab)
1579	const char *name;
1580	CODE *codetab;
1581{
1582	CODE *c;
1583	char *p, buf[40];
1584
1585	if (isdigit(*name))
1586		return (atoi(name));
1587
1588	for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
1589		if (isupper(*name))
1590			*p = tolower(*name);
1591		else
1592			*p = *name;
1593	}
1594	*p = '\0';
1595	for (c = codetab; c->c_name; c++)
1596		if (!strcmp(buf, c->c_name))
1597			return (c->c_val);
1598
1599	return (-1);
1600}
1601
1602/*
1603 * fork off and become a daemon, but wait for the child to come online
1604 * before returing to the parent, or we get disk thrashing at boot etc.
1605 * Set a timer so we don't hang forever if it wedges.
1606 */
1607int
1608waitdaemon(nochdir, noclose, maxwait)
1609	int nochdir, noclose, maxwait;
1610{
1611	int fd;
1612	int status;
1613	pid_t pid, childpid;
1614
1615	switch (childpid = fork()) {
1616	case -1:
1617		return (-1);
1618	case 0:
1619		break;
1620	default:
1621		signal(SIGALRM, timedout);
1622		alarm(maxwait);
1623		while ((pid = wait3(&status, 0, NULL)) != -1) {
1624			if (WIFEXITED(status))
1625				errx(1, "child pid %d exited with return code %d",
1626					pid, WEXITSTATUS(status));
1627			if (WIFSIGNALED(status))
1628				errx(1, "child pid %d exited on signal %d%s",
1629					pid, WTERMSIG(status),
1630					WCOREDUMP(status) ? " (core dumped)" :
1631					"");
1632			if (pid == childpid)	/* it's gone... */
1633				break;
1634		}
1635		exit(0);
1636	}
1637
1638	if (setsid() == -1)
1639		return (-1);
1640
1641	if (!nochdir)
1642		(void)chdir("/");
1643
1644	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1645		(void)dup2(fd, STDIN_FILENO);
1646		(void)dup2(fd, STDOUT_FILENO);
1647		(void)dup2(fd, STDERR_FILENO);
1648		if (fd > 2)
1649			(void)close (fd);
1650	}
1651	return (getppid());
1652}
1653
1654/*
1655 * We get a SIGALRM from the child when it's running and finished doing it's
1656 * fsync()'s or O_SYNC writes for all the boot messages.
1657 *
1658 * We also get a signal from the kernel if the timer expires, so check to
1659 * see what happened.
1660 */
1661void
1662timedout(sig)
1663	int sig __unused;
1664{
1665	int left;
1666	left = alarm(0);
1667	signal(SIGALRM, SIG_DFL);
1668	if (left == 0)
1669		errx(1, "timed out waiting for child");
1670	else
1671		exit(0);
1672}
1673
1674/*
1675 * Add `s' to the list of allowable peer addresses to accept messages
1676 * from.
1677 *
1678 * `s' is a string in the form:
1679 *
1680 *    [*]domainname[:{servicename|portnumber|*}]
1681 *
1682 * or
1683 *
1684 *    netaddr/maskbits[:{servicename|portnumber|*}]
1685 *
1686 * Returns -1 on error, 0 if the argument was valid.
1687 */
1688int
1689allowaddr(s)
1690	char *s;
1691{
1692	char *cp1, *cp2;
1693	struct allowedpeer ap;
1694	struct servent *se;
1695	regex_t re;
1696	int i;
1697
1698	if ((cp1 = strrchr(s, ':'))) {
1699		/* service/port provided */
1700		*cp1++ = '\0';
1701		if (strlen(cp1) == 1 && *cp1 == '*')
1702			/* any port allowed */
1703			ap.port = htons(0);
1704		else if ((se = getservbyname(cp1, "udp")))
1705			ap.port = se->s_port;
1706		else {
1707			ap.port = htons((int)strtol(cp1, &cp2, 0));
1708			if (*cp2 != '\0')
1709				return -1; /* port not numeric */
1710		}
1711	} else {
1712		if ((se = getservbyname("syslog", "udp")))
1713			ap.port = se->s_port;
1714		else
1715			/* sanity, should not happen */
1716			ap.port = htons(514);
1717	}
1718
1719	/* the regexp's are ugly, but the cleanest way */
1720
1721	if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$",
1722		    REG_EXTENDED))
1723		/* if RE compilation fails, that's an internal error */
1724		abort();
1725	if (regexec(&re, s, 0, 0, 0) == 0) {
1726		/* arg `s' is numeric */
1727		ap.isnumeric = 1;
1728		if ((cp1 = strchr(s, '/')) != NULL) {
1729			*cp1++ = '\0';
1730			i = atoi(cp1);
1731			if (i < 0 || i > 32)
1732				return -1;
1733			/* convert masklen to netmask */
1734			ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1));
1735		}
1736		if (ascii2addr(AF_INET, s, &ap.a_addr) == -1)
1737			return -1;
1738		if (cp1 == NULL) {
1739			/* use default netmask */
1740			if (IN_CLASSA(ntohl(ap.a_addr.s_addr)))
1741				ap.a_mask.s_addr = htonl(IN_CLASSA_NET);
1742			else if (IN_CLASSB(ntohl(ap.a_addr.s_addr)))
1743				ap.a_mask.s_addr = htonl(IN_CLASSB_NET);
1744			else
1745				ap.a_mask.s_addr = htonl(IN_CLASSC_NET);
1746		}
1747	} else {
1748		/* arg `s' is domain name */
1749		ap.isnumeric = 0;
1750		ap.a_name = s;
1751	}
1752	regfree(&re);
1753
1754	if (Debug) {
1755		printf("allowaddr: rule %d: ", NumAllowed);
1756		if (ap.isnumeric) {
1757			printf("numeric, ");
1758			printf("addr = %s, ",
1759			       addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0));
1760			printf("mask = %s; ",
1761			       addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0));
1762		} else
1763			printf("domainname = %s; ", ap.a_name);
1764		printf("port = %d\n", ntohs(ap.port));
1765	}
1766
1767	if ((AllowedPeers = realloc(AllowedPeers,
1768				    ++NumAllowed * sizeof(struct allowedpeer)))
1769	    == NULL) {
1770		fprintf(stderr, "Out of memory!\n");
1771		exit(EX_OSERR);
1772	}
1773	memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
1774	return 0;
1775}
1776
1777/*
1778 * Validate that the remote peer has permission to log to us.
1779 */
1780int
1781validate(sin, hname)
1782	struct sockaddr_in *sin;
1783	const char *hname;
1784{
1785	int i;
1786	size_t l1, l2;
1787	char *cp, name[MAXHOSTNAMELEN];
1788	struct allowedpeer *ap;
1789
1790	if (NumAllowed == 0)
1791		/* traditional behaviour, allow everything */
1792		return 1;
1793
1794	strncpy(name, hname, sizeof name);
1795	if (strchr(name, '.') == NULL) {
1796		strncat(name, ".", sizeof name - strlen(name) - 1);
1797		strncat(name, LocalDomain, sizeof name - strlen(name) - 1);
1798	}
1799	dprintf("validate: dgram from IP %s, port %d, name %s;\n",
1800		addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0),
1801		ntohs(sin->sin_port), name);
1802
1803	/* now, walk down the list */
1804	for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
1805		if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) {
1806			dprintf("rejected in rule %d due to port mismatch.\n", i);
1807			continue;
1808		}
1809
1810		if (ap->isnumeric) {
1811			if ((sin->sin_addr.s_addr & ap->a_mask.s_addr)
1812			    != ap->a_addr.s_addr) {
1813				dprintf("rejected in rule %d due to IP mismatch.\n", i);
1814				continue;
1815			}
1816		} else {
1817			cp = ap->a_name;
1818			l1 = strlen(name);
1819			if (*cp == '*') {
1820				/* allow wildmatch */
1821				cp++;
1822				l2 = strlen(cp);
1823				if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
1824					dprintf("rejected in rule %d due to name mismatch.\n", i);
1825					continue;
1826				}
1827			} else {
1828				/* exact match */
1829				l2 = strlen(cp);
1830				if (l2 != l1 || memcmp(cp, name, l1) != 0) {
1831					dprintf("rejected in rule %d due to name mismatch.\n", i);
1832					continue;
1833				}
1834			}
1835		}
1836		dprintf("accepted in rule %d.\n", i);
1837		return 1;	/* hooray! */
1838	}
1839	return 0;
1840}
1841
1842/*
1843 * Fairly similar to popen(3), but returns an open descriptor, as
1844 * opposed to a FILE *.
1845 */
1846int
1847p_open(prog, pid)
1848	char *prog;
1849	pid_t *pid;
1850{
1851	int pfd[2], nulldesc, i;
1852	sigset_t omask, mask;
1853	char *argv[4]; /* sh -c cmd NULL */
1854	char errmsg[200];
1855
1856	if (pipe(pfd) == -1)
1857		return -1;
1858	if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
1859		/* we are royally screwed anyway */
1860		return -1;
1861
1862	sigemptyset(&mask);
1863	sigaddset(&mask, SIGALRM);
1864	sigaddset(&mask, SIGHUP);
1865	sigprocmask(SIG_BLOCK, &mask, &omask);
1866	switch ((*pid = fork())) {
1867	case -1:
1868		sigprocmask(SIG_SETMASK, &omask, 0);
1869		close(nulldesc);
1870		return -1;
1871
1872	case 0:
1873		argv[0] = "sh";
1874		argv[1] = "-c";
1875		argv[2] = prog;
1876		argv[3] = NULL;
1877
1878		alarm(0);
1879		(void)setsid();	/* Avoid catching SIGHUPs. */
1880
1881		/*
1882		 * Throw away pending signals, and reset signal
1883		 * behaviour to standard values.
1884		 */
1885		signal(SIGALRM, SIG_IGN);
1886		signal(SIGHUP, SIG_IGN);
1887		sigprocmask(SIG_SETMASK, &omask, 0);
1888		signal(SIGPIPE, SIG_DFL);
1889		signal(SIGQUIT, SIG_DFL);
1890		signal(SIGALRM, SIG_DFL);
1891		signal(SIGHUP, SIG_DFL);
1892
1893		dup2(pfd[0], STDIN_FILENO);
1894		dup2(nulldesc, STDOUT_FILENO);
1895		dup2(nulldesc, STDERR_FILENO);
1896		for (i = getdtablesize(); i > 2; i--)
1897			(void) close(i);
1898
1899		(void) execvp(_PATH_BSHELL, argv);
1900		_exit(255);
1901	}
1902
1903	sigprocmask(SIG_SETMASK, &omask, 0);
1904	close(nulldesc);
1905	close(pfd[0]);
1906	/*
1907	 * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
1908	 * supposed to get an EWOULDBLOCK on writev(2), which is
1909	 * caught by the logic above anyway, which will in turn close
1910	 * the pipe, and fork a new logging subprocess if necessary.
1911	 * The stale subprocess will be killed some time later unless
1912	 * it terminated itself due to closing its input pipe (so we
1913	 * get rid of really dead puppies).
1914	 */
1915	if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
1916		/* This is bad. */
1917		(void)snprintf(errmsg, sizeof errmsg,
1918			       "Warning: cannot change pipe to PID %d to "
1919			       "non-blocking behaviour.",
1920			       (int)*pid);
1921		logerror(errmsg);
1922	}
1923	return pfd[1];
1924}
1925
1926void
1927deadq_enter(pid, name)
1928	pid_t pid;
1929	const char *name;
1930{
1931	dq_t p;
1932	int status;
1933
1934	/*
1935	 * Be paranoid, if we can't signal the process, don't enter it
1936	 * into the dead queue (perhaps it's already dead).  If possible,
1937	 * we try to fetch and log the child's status.
1938	 */
1939	if (kill(pid, 0) != 0) {
1940		if (waitpid(pid, &status, WNOHANG) > 0)
1941			log_deadchild(pid, status, name);
1942		return;
1943	}
1944
1945	p = malloc(sizeof(struct deadq_entry));
1946	if (p == 0) {
1947		errno = 0;
1948		logerror("panic: out of virtual memory!");
1949		exit(1);
1950	}
1951
1952	p->dq_pid = pid;
1953	p->dq_timeout = DQ_TIMO_INIT;
1954	TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
1955}
1956
1957int
1958deadq_remove(pid)
1959	pid_t pid;
1960{
1961	dq_t q;
1962
1963	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
1964		if (q->dq_pid == pid) {
1965			TAILQ_REMOVE(&deadq_head, q, dq_entries);
1966				free(q);
1967				return 1;
1968		}
1969
1970	return 0;
1971}
1972
1973void
1974log_deadchild(pid, status, name)
1975	pid_t pid;
1976	int status;
1977	const char *name;
1978{
1979	int code;
1980	char buf[256];
1981	const char *reason;
1982
1983	errno = 0; /* Keep strerror() stuff out of logerror messages. */
1984	if (WIFSIGNALED(status)) {
1985		reason = "due to signal";
1986		code = WTERMSIG(status);
1987	} else {
1988		reason = "with status";
1989		code = WEXITSTATUS(status);
1990		if (code == 0)
1991			return;
1992	}
1993	(void)snprintf(buf, sizeof buf,
1994		       "Logging subprocess %d (%s) exited %s %d.",
1995		       pid, name, reason, code);
1996	logerror(buf);
1997}
1998