syslogd.c revision 37145 
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 1.33 1998/06/10 04:34:56 julian 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 */
71
72#define	MAXLINE		1024		/* maximum line length */
73#define	MAXSVLINE	120		/* maximum saved line length */
74#define DEFUPRI		(LOG_USER|LOG_NOTICE)
75#define DEFSPRI		(LOG_KERN|LOG_CRIT)
76#define TIMERINTVL	30		/* interval for checking flush, mark */
77#define TTYMSGTIME	1		/* timed out passed to ttymsg */
78
79#include <sys/param.h>
80#include <sys/ioctl.h>
81#include <sys/stat.h>
82#include <sys/wait.h>
83#include <sys/socket.h>
84#include <sys/queue.h>
85#include <sys/uio.h>
86#include <sys/un.h>
87#include <sys/time.h>
88#include <sys/resource.h>
89#include <sys/syslimits.h>
90#include <paths.h>
91
92#include <netinet/in.h>
93#include <netdb.h>
94#include <arpa/inet.h>
95
96#include <ctype.h>
97#include <err.h>
98#include <errno.h>
99#include <fcntl.h>
100#include <regex.h>
101#include <setjmp.h>
102#include <signal.h>
103#include <stdio.h>
104#include <stdlib.h>
105#include <string.h>
106#include <sysexits.h>
107#include <unistd.h>
108#include <utmp.h>
109#include "pathnames.h"
110
111#define SYSLOG_NAMES
112#include <sys/syslog.h>
113
114const char	*LogName = _PATH_LOG;
115const char	*ConfFile = _PATH_LOGCONF;
116const char	*PidFile = _PATH_LOGPID;
117const char	ctty[] = _PATH_CONSOLE;
118
119#define FDMASK(fd)	(1 << (fd))
120
121#define	dprintf		if (Debug) printf
122
123#define MAXUNAMES	20	/* maximum number of user names */
124
125/*
126 * Flags to logmsg().
127 */
128
129#define IGN_CONS	0x001	/* don't print on console */
130#define SYNC_FILE	0x002	/* do fsync on file after printing */
131#define ADDDATE		0x004	/* add a date to the message */
132#define MARK		0x008	/* this message is a mark */
133#define ISKERNEL	0x010	/* kernel generated message */
134
135/*
136 * This structure represents the files that will have log
137 * copies printed.
138 */
139
140struct filed {
141	struct	filed *f_next;		/* next in linked list */
142	short	f_type;			/* entry type, see below */
143	short	f_file;			/* file descriptor */
144	time_t	f_time;			/* time this was last written */
145	u_char	f_pmask[LOG_NFACILITIES+1];	/* priority mask */
146	char	*f_program;		/* program this applies to */
147	union {
148		char	f_uname[MAXUNAMES][UT_NAMESIZE+1];
149		struct {
150			char	f_hname[MAXHOSTNAMELEN+1];
151			struct sockaddr_in	f_addr;
152		} f_forw;		/* forwarding address */
153		char	f_fname[MAXPATHLEN];
154		struct {
155			char	f_pname[MAXPATHLEN];
156			pid_t	f_pid;
157		} f_pipe;
158	} f_un;
159	char	f_prevline[MAXSVLINE];		/* last message logged */
160	char	f_lasttime[16];			/* time of last occurrence */
161	char	f_prevhost[MAXHOSTNAMELEN+1];	/* host from which recd. */
162	int	f_prevpri;			/* pri of f_prevline */
163	int	f_prevlen;			/* length of f_prevline */
164	int	f_prevcount;			/* repetition cnt of prevline */
165	int	f_repeatcount;			/* number of "repeated" msgs */
166};
167
168/*
169 * Queue of about-to-be dead processes we should watch out for.
170 */
171
172TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
173struct stailhead *deadq_headp;
174
175struct deadq_entry {
176	pid_t				dq_pid;
177	int				dq_timeout;
178	TAILQ_ENTRY(deadq_entry)	dq_entries;
179};
180
181/*
182 * The timeout to apply to processes waiting on the dead queue.  Unit
183 * of measure is `mark intervals', i.e. 20 minutes by default.
184 * Processes on the dead queue will be terminated after that time.
185 */
186
187#define DQ_TIMO_INIT	2
188
189typedef struct deadq_entry *dq_t;
190
191
192/*
193 * Struct to hold records of network addresses that are allowed to log
194 * to us.
195 */
196struct allowedpeer {
197	int isnumeric;
198	u_short port;
199	union {
200		struct {
201			struct in_addr addr;
202			struct in_addr mask;
203		} numeric;
204		char *name;
205	} u;
206#define a_addr u.numeric.addr
207#define a_mask u.numeric.mask
208#define a_name u.name
209};
210
211
212/*
213 * Intervals at which we flush out "message repeated" messages,
214 * in seconds after previous message is logged.  After each flush,
215 * we move to the next interval until we reach the largest.
216 */
217int	repeatinterval[] = { 30, 120, 600 };	/* # of secs before flush */
218#define	MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
219#define	REPEATTIME(f)	((f)->f_time + repeatinterval[(f)->f_repeatcount])
220#define	BACKOFF(f)	{ if (++(f)->f_repeatcount > MAXREPEAT) \
221				 (f)->f_repeatcount = MAXREPEAT; \
222			}
223
224/* values for f_type */
225#define F_UNUSED	0		/* unused entry */
226#define F_FILE		1		/* regular file */
227#define F_TTY		2		/* terminal */
228#define F_CONSOLE	3		/* console terminal */
229#define F_FORW		4		/* remote machine */
230#define F_USERS		5		/* list of users */
231#define F_WALL		6		/* everyone logged on */
232#define F_PIPE		7		/* pipe to program */
233
234char	*TypeNames[8] = {
235	"UNUSED",	"FILE",		"TTY",		"CONSOLE",
236	"FORW",		"USERS",	"WALL",		"PIPE"
237};
238
239struct	filed *Files;
240struct	filed consfile;
241
242int	Debug;			/* debug flag */
243char	LocalHostName[MAXHOSTNAMELEN+1];	/* our hostname */
244char	*LocalDomain;		/* our local domain name */
245int	finet;			/* Internet datagram socket */
246int	LogPort;		/* port number for INET connections */
247int	Initialized = 0;	/* set when we have initialized ourselves */
248int	MarkInterval = 20 * 60;	/* interval between marks in seconds */
249int	MarkSeq = 0;		/* mark sequence number */
250int	SecureMode = 0;		/* when true, receive only unix domain socks */
251u_int	Vogons = 0;		/* packets arriving in SecureMode */
252
253int     created_lsock = 0;      /* Flag if local socket created */
254char	bootfile[MAXLINE+1];	/* booted kernel file */
255
256struct allowedpeer *AllowedPeers;
257int	NumAllowed = 0;		/* # of AllowedPeer entries */
258
259int	allowaddr __P((char *));
260void	cfline __P((char *, struct filed *, char *));
261char   *cvthname __P((struct sockaddr_in *));
262void	deadq_enter __P((pid_t));
263int	decode __P((const char *, CODE *));
264void	die __P((int));
265void	domark __P((int));
266void	fprintlog __P((struct filed *, int, char *));
267void	init __P((int));
268void	logerror __P((const char *));
269void	logmsg __P((int, char *, char *, int));
270void	printline __P((char *, char *));
271void	printsys __P((char *));
272int	p_open __P((char *, pid_t *));
273void	reapchild __P((int));
274char   *ttymsg __P((struct iovec *, int, char *, int));
275static void	usage __P((void));
276int	validate __P((struct sockaddr_in *, const char *));
277void	wallmsg __P((struct filed *, struct iovec *));
278int	waitdaemon __P((int, int, int));
279void	timedout __P((int));
280
281int
282main(argc, argv)
283	int argc;
284	char *argv[];
285{
286	int ch, funix, i, inetm, fklog, klogm, len;
287	struct sockaddr_un sunx, fromunix;
288	struct sockaddr_in sin, frominet;
289	FILE *fp;
290	char *p, *hname, line[MAXLINE + 1];
291	struct timeval tv, *tvp;
292	pid_t ppid;
293
294	while ((ch = getopt(argc, argv, "a:dsf:m:p:")) != -1)
295		switch(ch) {
296		case 'd':		/* debug */
297			Debug++;
298			break;
299		case 'a':		/* allow specific network addresses only */
300			if (allowaddr(optarg) == -1)
301				usage();
302			break;
303		case 'f':		/* configuration file */
304			ConfFile = optarg;
305			break;
306		case 'm':		/* mark interval */
307			MarkInterval = atoi(optarg) * 60;
308			break;
309		case 'p':		/* path */
310			LogName = optarg;
311			break;
312		case 's':		/* no network mode */
313			SecureMode++;
314			break;
315		case '?':
316		default:
317			usage();
318		}
319	if ((argc -= optind) != 0)
320		usage();
321
322	if (!Debug) {
323		ppid = waitdaemon(0, 0, 30);
324		if (ppid < 0)
325			err(1, "could not become daemon");
326	} else
327		setlinebuf(stdout);
328
329	if (NumAllowed)
330		endservent();
331
332	consfile.f_type = F_CONSOLE;
333	(void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1);
334	(void)gethostname(LocalHostName, sizeof(LocalHostName));
335	if ((p = strchr(LocalHostName, '.')) != NULL) {
336		*p++ = '\0';
337		LocalDomain = p;
338	} else
339		LocalDomain = "";
340	(void)strcpy(bootfile, getbootfile());
341	(void)signal(SIGTERM, die);
342	(void)signal(SIGINT, Debug ? die : SIG_IGN);
343	(void)signal(SIGQUIT, Debug ? die : SIG_IGN);
344	(void)signal(SIGCHLD, reapchild);
345	(void)signal(SIGALRM, domark);
346	(void)signal(SIGPIPE, SIG_IGN);	/* We'll catch EPIPE instead. */
347	(void)alarm(TIMERINTVL);
348
349	TAILQ_INIT(&deadq_head);
350
351#ifndef SUN_LEN
352#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
353#endif
354	memset(&sunx, 0, sizeof(sunx));
355	sunx.sun_family = AF_UNIX;
356	(void)strncpy(sunx.sun_path, LogName, sizeof(sunx.sun_path));
357	(void)unlink(LogName);
358	funix = socket(AF_UNIX, SOCK_DGRAM, 0);
359	if (funix < 0 ||
360	    bind(funix, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
361	    chmod(LogName, 0666) < 0) {
362		(void) snprintf(line, sizeof line, "cannot create %s", LogName);
363		logerror(line);
364		dprintf("cannot create %s (%d)\n", LogName, errno);
365		die(0);
366	} else
367		created_lsock = 1;
368
369	inetm = 0;
370	finet = socket(AF_INET, SOCK_DGRAM, 0);
371	if (finet >= 0) {
372		struct servent *sp;
373
374		sp = getservbyname("syslog", "udp");
375		if (sp == NULL) {
376			errno = 0;
377			logerror("syslog/udp: unknown service");
378			die(0);
379		}
380		memset(&sin, 0, sizeof(sin));
381		sin.sin_family = AF_INET;
382		sin.sin_port = LogPort = sp->s_port;
383
384		if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
385			logerror("bind");
386			if (!Debug)
387				die(0);
388		} else
389			inetm = FDMASK(finet);
390	}
391
392	if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
393		klogm = FDMASK(fklog);
394	else {
395		dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
396		klogm = 0;
397	}
398
399	/* tuck my process id away */
400	fp = fopen(PidFile, "w");
401	if (fp != NULL) {
402		fprintf(fp, "%d\n", getpid());
403		(void) fclose(fp);
404	}
405
406	dprintf("off & running....\n");
407
408	init(0);
409	(void)signal(SIGHUP, init);
410
411	tvp = &tv;
412	tv.tv_sec = tv.tv_usec = 0;
413
414	for (;;) {
415		int nfds, readfds = FDMASK(funix) | inetm | klogm;
416
417		dprintf("readfds = %#x\n", readfds);
418		nfds = select(20, (fd_set *)&readfds, (fd_set *)NULL,
419		    (fd_set *)NULL, tvp);
420		if (nfds == 0) {
421			if (tvp) {
422				tvp = NULL;
423				if (ppid != 1)
424					kill(ppid, SIGALRM);
425			}
426			continue;
427		}
428		if (nfds < 0) {
429			if (errno != EINTR)
430				logerror("select");
431			continue;
432		}
433		dprintf("got a message (%d, %#x)\n", nfds, readfds);
434		if (readfds & klogm) {
435			i = read(fklog, line, MAXLINE - 1);
436			if (i > 0) {
437				line[i] = '\0';
438				printsys(line);
439			} else if (i < 0 && errno != EINTR) {
440				logerror("klog");
441				fklog = -1;
442				klogm = 0;
443			}
444		}
445		if (readfds & FDMASK(funix)) {
446			len = sizeof(fromunix);
447			i = recvfrom(funix, line, MAXLINE, 0,
448			    (struct sockaddr *)&fromunix, &len);
449			if (i > 0) {
450				line[i] = '\0';
451				printline(LocalHostName, line);
452			} else if (i < 0 && errno != EINTR)
453				logerror("recvfrom unix");
454		}
455		if (readfds & inetm) {
456			len = sizeof(frominet);
457			i = recvfrom(finet, line, MAXLINE, 0,
458			    (struct sockaddr *)&frominet, &len);
459			if (SecureMode) {
460				Vogons++;
461				if (!(Vogons & (Vogons - 1))) {
462					(void)snprintf(line, sizeof line,
463"syslogd: discarded %d unwanted packets in secure mode", Vogons);
464					logmsg(LOG_SYSLOG|LOG_AUTH, line,
465					    LocalHostName, ADDDATE);
466				}
467			} else if (i > 0) {
468				line[i] = '\0';
469				hname = cvthname(&frominet);
470				if (validate(&frominet, hname))
471					printline(hname, line);
472			} else if (i < 0 && errno != EINTR)
473				logerror("recvfrom inet");
474		}
475	}
476}
477
478static void
479usage()
480{
481
482	fprintf(stderr, "%s\n%s\n",
483		"usage: syslogd [-ds] [-a allowed_peer] [-f config_file]",
484		"               [-m mark_interval] [-p log_socket]");
485	exit(1);
486}
487
488/*
489 * Take a raw input line, decode the message, and print the message
490 * on the appropriate log files.
491 */
492void
493printline(hname, msg)
494	char *hname;
495	char *msg;
496{
497	int c, pri;
498	char *p, *q, line[MAXLINE + 1];
499
500	/* test for special codes */
501	pri = DEFUPRI;
502	p = msg;
503	if (*p == '<') {
504		pri = 0;
505		while (isdigit(*++p))
506			pri = 10 * pri + (*p - '0');
507		if (*p == '>')
508			++p;
509	}
510	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
511		pri = DEFUPRI;
512
513	/* don't allow users to log kernel messages */
514	if (LOG_FAC(pri) == LOG_KERN)
515		pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
516
517	q = line;
518
519	while ((c = *p++ & 0177) != '\0' &&
520	    q < &line[sizeof(line) - 1])
521		if (iscntrl(c))
522			if (c == '\n')
523				*q++ = ' ';
524			else if (c == '\t')
525				*q++ = '\t';
526			else {
527				*q++ = '^';
528				*q++ = c ^ 0100;
529			}
530		else
531			*q++ = c;
532	*q = '\0';
533
534	logmsg(pri, line, hname, 0);
535}
536
537/*
538 * Take a raw input line from /dev/klog, split and format similar to syslog().
539 */
540void
541printsys(msg)
542	char *msg;
543{
544	int c, pri, flags;
545	char *p, *q;
546
547	for (p = msg; *p != '\0'; ) {
548		flags = ISKERNEL | SYNC_FILE | ADDDATE;	/* fsync after write */
549		pri = DEFSPRI;
550		if (*p == '<') {
551			pri = 0;
552			while (isdigit(*++p))
553				pri = 10 * pri + (*p - '0');
554			if (*p == '>')
555				++p;
556		} else {
557			/* kernel printf's come out on console */
558			flags |= IGN_CONS;
559		}
560		if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
561			pri = DEFSPRI;
562		for (q = p; *q != '\0' && *q != '\n'; q++);
563		if (*q != '\0')
564			*q++ = '\0';
565		logmsg(pri, p, LocalHostName, flags);
566		p = q;
567	}
568}
569
570time_t	now;
571
572/*
573 * Log a message to the appropriate log files, users, etc. based on
574 * the priority.
575 */
576void
577logmsg(pri, msg, from, flags)
578	int pri;
579	char *msg, *from;
580	int flags;
581{
582	struct filed *f;
583	int i, fac, msglen, omask, prilev;
584	char *timestamp;
585 	char prog[NAME_MAX+1];
586	char buf[MAXLINE+1];
587
588	dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
589	    pri, flags, from, msg);
590
591	omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
592
593	/*
594	 * Check to see if msg looks non-standard.
595	 */
596	msglen = strlen(msg);
597	if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
598	    msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
599		flags |= ADDDATE;
600
601	(void)time(&now);
602	if (flags & ADDDATE)
603		timestamp = ctime(&now) + 4;
604	else {
605		timestamp = msg;
606		msg += 16;
607		msglen -= 16;
608	}
609
610	/* skip leading blanks */
611	while(isspace(*msg)) {
612		msg++;
613		msglen--;
614	}
615
616	/* extract facility and priority level */
617	if (flags & MARK)
618		fac = LOG_NFACILITIES;
619	else
620		fac = LOG_FAC(pri);
621	prilev = LOG_PRI(pri);
622
623	/* extract program name */
624	for(i = 0; i < NAME_MAX; i++) {
625		if(!isalnum(msg[i]))
626			break;
627		prog[i] = msg[i];
628	}
629	prog[i] = 0;
630
631	/* add kernel prefix for kernel messages */
632	if (flags & ISKERNEL) {
633		snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg);
634		msg = buf;
635		msglen = strlen(buf);
636	}
637
638	/* log the message to the particular outputs */
639	if (!Initialized) {
640		f = &consfile;
641		f->f_file = open(ctty, O_WRONLY, 0);
642
643		if (f->f_file >= 0) {
644			fprintlog(f, flags, msg);
645			(void)close(f->f_file);
646		}
647		(void)sigsetmask(omask);
648		return;
649	}
650	for (f = Files; f; f = f->f_next) {
651		/* skip messages that are incorrect priority */
652		if (f->f_pmask[fac] < prilev ||
653		    f->f_pmask[fac] == INTERNAL_NOPRI)
654			continue;
655		/* skip messages with the incorrect program name */
656		if(f->f_program)
657			if(strcmp(prog, f->f_program) != 0)
658				continue;
659
660		if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
661			continue;
662
663		/* don't output marks to recently written files */
664		if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
665			continue;
666
667		/*
668		 * suppress duplicate lines to this file
669		 */
670		if ((flags & MARK) == 0 && msglen == f->f_prevlen &&
671		    !strcmp(msg, f->f_prevline) &&
672		    !strcmp(from, f->f_prevhost)) {
673			(void)strncpy(f->f_lasttime, timestamp, 15);
674			f->f_prevcount++;
675			dprintf("msg repeated %d times, %ld sec of %d\n",
676			    f->f_prevcount, now - f->f_time,
677			    repeatinterval[f->f_repeatcount]);
678			/*
679			 * If domark would have logged this by now,
680			 * flush it now (so we don't hold isolated messages),
681			 * but back off so we'll flush less often
682			 * in the future.
683			 */
684			if (now > REPEATTIME(f)) {
685				fprintlog(f, flags, (char *)NULL);
686				BACKOFF(f);
687			}
688		} else {
689			/* new line, save it */
690			if (f->f_prevcount)
691				fprintlog(f, 0, (char *)NULL);
692			f->f_repeatcount = 0;
693			f->f_prevpri = pri;
694			(void)strncpy(f->f_lasttime, timestamp, 15);
695			(void)strncpy(f->f_prevhost, from,
696					sizeof(f->f_prevhost));
697			if (msglen < MAXSVLINE) {
698				f->f_prevlen = msglen;
699				(void)strcpy(f->f_prevline, msg);
700				fprintlog(f, flags, (char *)NULL);
701			} else {
702				f->f_prevline[0] = 0;
703				f->f_prevlen = 0;
704				fprintlog(f, flags, msg);
705			}
706		}
707	}
708	(void)sigsetmask(omask);
709}
710
711void
712fprintlog(f, flags, msg)
713	struct filed *f;
714	int flags;
715	char *msg;
716{
717	struct iovec iov[6];
718	struct iovec *v;
719	int l;
720	char line[MAXLINE + 1], repbuf[80], greetings[200];
721	char *msgret;
722
723	v = iov;
724	if (f->f_type == F_WALL) {
725		v->iov_base = greetings;
726		v->iov_len = snprintf(greetings, sizeof greetings,
727		    "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
728		    f->f_prevhost, ctime(&now));
729		v++;
730		v->iov_base = "";
731		v->iov_len = 0;
732		v++;
733	} else {
734		v->iov_base = f->f_lasttime;
735		v->iov_len = 15;
736		v++;
737		v->iov_base = " ";
738		v->iov_len = 1;
739		v++;
740	}
741	v->iov_base = f->f_prevhost;
742	v->iov_len = strlen(v->iov_base);
743	v++;
744	v->iov_base = " ";
745	v->iov_len = 1;
746	v++;
747
748	if (msg) {
749		v->iov_base = msg;
750		v->iov_len = strlen(msg);
751	} else if (f->f_prevcount > 1) {
752		v->iov_base = repbuf;
753		v->iov_len = sprintf(repbuf, "last message repeated %d times",
754		    f->f_prevcount);
755	} else {
756		v->iov_base = f->f_prevline;
757		v->iov_len = f->f_prevlen;
758	}
759	v++;
760
761	dprintf("Logging to %s", TypeNames[f->f_type]);
762	f->f_time = now;
763
764	switch (f->f_type) {
765	case F_UNUSED:
766		dprintf("\n");
767		break;
768
769	case F_FORW:
770		dprintf(" %s\n", f->f_un.f_forw.f_hname);
771		l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
772			     f->f_prevpri, iov[0].iov_base, iov[4].iov_base);
773		if (l > MAXLINE)
774			l = MAXLINE;
775		if ((finet >= 0) &&
776		     (sendto(finet, line, l, 0,
777			     (struct sockaddr *)&f->f_un.f_forw.f_addr,
778			     sizeof(f->f_un.f_forw.f_addr)) != l)) {
779			int e = errno;
780			(void)close(f->f_file);
781			f->f_type = F_UNUSED;
782			errno = e;
783			logerror("sendto");
784		}
785		break;
786
787	case F_FILE:
788		dprintf(" %s\n", f->f_un.f_fname);
789		v->iov_base = "\n";
790		v->iov_len = 1;
791		if (writev(f->f_file, iov, 6) < 0) {
792			int e = errno;
793			(void)close(f->f_file);
794			f->f_type = F_UNUSED;
795			errno = e;
796			logerror(f->f_un.f_fname);
797		} else if (flags & SYNC_FILE)
798			(void)fsync(f->f_file);
799		break;
800
801	case F_PIPE:
802		dprintf(" %s\n", f->f_un.f_pipe.f_pname);
803		v->iov_base = "\n";
804		v->iov_len = 1;
805		if (f->f_un.f_pipe.f_pid == 0) {
806			if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
807						&f->f_un.f_pipe.f_pid)) < 0) {
808				f->f_type = F_UNUSED;
809				logerror(f->f_un.f_pipe.f_pname);
810				break;
811			}
812		}
813		if (writev(f->f_file, iov, 6) < 0) {
814			int e = errno;
815			(void)close(f->f_file);
816			if (f->f_un.f_pipe.f_pid > 0)
817				deadq_enter(f->f_un.f_pipe.f_pid);
818			f->f_un.f_pipe.f_pid = 0;
819			errno = e;
820			logerror(f->f_un.f_pipe.f_pname);
821		}
822		break;
823
824	case F_CONSOLE:
825		if (flags & IGN_CONS) {
826			dprintf(" (ignored)\n");
827			break;
828		}
829		/* FALLTHROUGH */
830
831	case F_TTY:
832		dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
833		v->iov_base = "\r\n";
834		v->iov_len = 2;
835
836		errno = 0;	/* ttymsg() only sometimes returns an errno */
837		if ((msgret = ttymsg(iov, 6, f->f_un.f_fname, 10))) {
838			f->f_type = F_UNUSED;
839			logerror(msgret);
840		}
841		break;
842
843	case F_USERS:
844	case F_WALL:
845		dprintf("\n");
846		v->iov_base = "\r\n";
847		v->iov_len = 2;
848		wallmsg(f, iov);
849		break;
850	}
851	f->f_prevcount = 0;
852}
853
854/*
855 *  WALLMSG -- Write a message to the world at large
856 *
857 *	Write the specified message to either the entire
858 *	world, or a list of approved users.
859 */
860void
861wallmsg(f, iov)
862	struct filed *f;
863	struct iovec *iov;
864{
865	static int reenter;			/* avoid calling ourselves */
866	FILE *uf;
867	struct utmp ut;
868	int i;
869	char *p;
870	char line[sizeof(ut.ut_line) + 1];
871
872	if (reenter++)
873		return;
874	if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
875		logerror(_PATH_UTMP);
876		reenter = 0;
877		return;
878	}
879	/* NOSTRICT */
880	while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
881		if (ut.ut_name[0] == '\0')
882			continue;
883		strncpy(line, ut.ut_line, sizeof(ut.ut_line));
884		line[sizeof(ut.ut_line)] = '\0';
885		if (f->f_type == F_WALL) {
886			if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) != NULL) {
887				errno = 0;	/* already in msg */
888				logerror(p);
889			}
890			continue;
891		}
892		/* should we send the message to this user? */
893		for (i = 0; i < MAXUNAMES; i++) {
894			if (!f->f_un.f_uname[i][0])
895				break;
896			if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
897			    UT_NAMESIZE)) {
898				if ((p = ttymsg(iov, 6, line, TTYMSGTIME))
899								!= NULL) {
900					errno = 0;	/* already in msg */
901					logerror(p);
902				}
903				break;
904			}
905		}
906	}
907	(void)fclose(uf);
908	reenter = 0;
909}
910
911void
912reapchild(signo)
913	int signo;
914{
915	int status, code;
916	pid_t pid;
917	struct filed *f;
918	char buf[256];
919	const char *reason;
920	dq_t q;
921
922	while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
923		if (!Initialized)
924			/* Don't tell while we are initting. */
925			continue;
926
927		/* First, look if it's a process from the dead queue. */
928		for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
929			if (q->dq_pid == pid) {
930				TAILQ_REMOVE(&deadq_head, q, dq_entries);
931				free(q);
932				goto oncemore;
933			}
934
935		/* Now, look in list of active processes. */
936		for (f = Files; f; f = f->f_next)
937			if (f->f_type == F_PIPE &&
938			    f->f_un.f_pipe.f_pid == pid) {
939				(void)close(f->f_file);
940
941				errno = 0; /* Keep strerror() stuff out of logerror messages. */
942				f->f_un.f_pipe.f_pid = 0;
943				if (WIFSIGNALED(status)) {
944					reason = "due to signal";
945					code = WTERMSIG(status);
946				} else {
947					reason = "with status";
948					code = WEXITSTATUS(status);
949					if (code == 0)
950						goto oncemore; /* Exited OK. */
951				}
952				(void)snprintf(buf, sizeof buf,
953				"Logging subprocess %d (%s) exited %s %d.",
954					       pid, f->f_un.f_pipe.f_pname,
955					       reason, code);
956				logerror(buf);
957				break;
958			}
959	  oncemore:
960	}
961}
962
963/*
964 * Return a printable representation of a host address.
965 */
966char *
967cvthname(f)
968	struct sockaddr_in *f;
969{
970	struct hostent *hp;
971	char *p;
972
973	dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr));
974
975	if (f->sin_family != AF_INET) {
976		dprintf("Malformed from address\n");
977		return ("???");
978	}
979	hp = gethostbyaddr((char *)&f->sin_addr,
980	    sizeof(struct in_addr), f->sin_family);
981	if (hp == 0) {
982		dprintf("Host name for your address (%s) unknown\n",
983			inet_ntoa(f->sin_addr));
984		return (inet_ntoa(f->sin_addr));
985	}
986	if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0)
987		*p = '\0';
988	return (hp->h_name);
989}
990
991void
992domark(signo)
993	int signo;
994{
995	struct filed *f;
996	dq_t q;
997
998	now = time((time_t *)NULL);
999	MarkSeq += TIMERINTVL;
1000	if (MarkSeq >= MarkInterval) {
1001		logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK);
1002		MarkSeq = 0;
1003	}
1004
1005	for (f = Files; f; f = f->f_next) {
1006		if (f->f_prevcount && now >= REPEATTIME(f)) {
1007			dprintf("flush %s: repeated %d times, %d sec.\n",
1008			    TypeNames[f->f_type], f->f_prevcount,
1009			    repeatinterval[f->f_repeatcount]);
1010			fprintlog(f, 0, (char *)NULL);
1011			BACKOFF(f);
1012		}
1013	}
1014
1015	/* Walk the dead queue, and see if we should signal somebody. */
1016	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
1017		switch (q->dq_timeout) {
1018		case 0:
1019			/* Already signalled once, try harder now. */
1020			kill(q->dq_pid, SIGKILL);
1021			break;
1022
1023		case 1:
1024			/*
1025			 * Timed out on dead queue, send terminate
1026			 * signal.  Note that we leave the removal
1027			 * from the dead queue to reapchild(), which
1028			 * will also log the event.
1029			 */
1030			kill(q->dq_pid, SIGTERM);
1031			/* FALLTROUGH */
1032
1033		default:
1034			q->dq_timeout--;
1035		}
1036
1037	(void)alarm(TIMERINTVL);
1038}
1039
1040/*
1041 * Print syslogd errors some place.
1042 */
1043void
1044logerror(type)
1045	const char *type;
1046{
1047	char buf[512];
1048
1049	if (errno)
1050		(void)snprintf(buf,
1051		    sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1052	else
1053		(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1054	errno = 0;
1055	dprintf("%s\n", buf);
1056	logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1057}
1058
1059void
1060die(signo)
1061	int signo;
1062{
1063	struct filed *f;
1064	int was_initialized;
1065	char buf[100];
1066
1067	was_initialized = Initialized;
1068	Initialized = 0;	/* Don't log SIGCHLDs. */
1069	for (f = Files; f != NULL; f = f->f_next) {
1070		/* flush any pending output */
1071		if (f->f_prevcount)
1072			fprintlog(f, 0, (char *)NULL);
1073		if (f->f_type == F_PIPE)
1074			(void)close(f->f_file);
1075	}
1076	Initialized = was_initialized;
1077	if (signo) {
1078		dprintf("syslogd: exiting on signal %d\n", signo);
1079		(void)sprintf(buf, "exiting on signal %d", signo);
1080		errno = 0;
1081		logerror(buf);
1082	}
1083	if (created_lsock)
1084		(void)unlink(LogName);
1085	exit(1);
1086}
1087
1088/*
1089 *  INIT -- Initialize syslogd from configuration table
1090 */
1091void
1092init(signo)
1093	int signo;
1094{
1095	int i;
1096	FILE *cf;
1097	struct filed *f, *next, **nextp;
1098	char *p;
1099	char cline[LINE_MAX];
1100 	char prog[NAME_MAX+1];
1101
1102	dprintf("init\n");
1103
1104	/*
1105	 *  Close all open log files.
1106	 */
1107	Initialized = 0;
1108	for (f = Files; f != NULL; f = next) {
1109		/* flush any pending output */
1110		if (f->f_prevcount)
1111			fprintlog(f, 0, (char *)NULL);
1112
1113		switch (f->f_type) {
1114		case F_FILE:
1115		case F_FORW:
1116		case F_CONSOLE:
1117		case F_TTY:
1118			(void)close(f->f_file);
1119			break;
1120		case F_PIPE:
1121			(void)close(f->f_file);
1122			if (f->f_un.f_pipe.f_pid > 0)
1123				deadq_enter(f->f_un.f_pipe.f_pid);
1124			f->f_un.f_pipe.f_pid = 0;
1125			break;
1126		}
1127		next = f->f_next;
1128		if(f->f_program) free(f->f_program);
1129		free((char *)f);
1130	}
1131	Files = NULL;
1132	nextp = &Files;
1133
1134	/* open the configuration file */
1135	if ((cf = fopen(ConfFile, "r")) == NULL) {
1136		dprintf("cannot open %s\n", ConfFile);
1137		*nextp = (struct filed *)calloc(1, sizeof(*f));
1138		cfline("*.ERR\t/dev/console", *nextp, "*");
1139		(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1140		cfline("*.PANIC\t*", (*nextp)->f_next, "*");
1141		Initialized = 1;
1142		return;
1143	}
1144
1145	/*
1146	 *  Foreach line in the conf table, open that file.
1147	 */
1148	f = NULL;
1149	strcpy(prog, "*");
1150	while (fgets(cline, sizeof(cline), cf) != NULL) {
1151		/*
1152		 * check for end-of-section, comments, strip off trailing
1153		 * spaces and newline character. #!prog is treated specially:
1154		 * following lines apply only to that program.
1155		 */
1156		for (p = cline; isspace(*p); ++p)
1157			continue;
1158		if (*p == 0)
1159			continue;
1160		if(*p == '#') {
1161			p++;
1162			if(*p!='!')
1163				continue;
1164		}
1165		if(*p=='!') {
1166			p++;
1167			while(isspace(*p)) p++;
1168			if(!*p) {
1169				strcpy(prog, "*");
1170				continue;
1171			}
1172			for(i = 0; i < NAME_MAX; i++) {
1173				if(!isalnum(p[i]))
1174					break;
1175				prog[i] = p[i];
1176			}
1177			prog[i] = 0;
1178			continue;
1179		}
1180		for (p = strchr(cline, '\0'); isspace(*--p);)
1181			continue;
1182		*++p = '\0';
1183		f = (struct filed *)calloc(1, sizeof(*f));
1184		*nextp = f;
1185		nextp = &f->f_next;
1186		cfline(cline, f, prog);
1187	}
1188
1189	/* close the configuration file */
1190	(void)fclose(cf);
1191
1192	Initialized = 1;
1193
1194	if (Debug) {
1195		for (f = Files; f; f = f->f_next) {
1196			for (i = 0; i <= LOG_NFACILITIES; i++)
1197				if (f->f_pmask[i] == INTERNAL_NOPRI)
1198					printf("X ");
1199				else
1200					printf("%d ", f->f_pmask[i]);
1201			printf("%s: ", TypeNames[f->f_type]);
1202			switch (f->f_type) {
1203			case F_FILE:
1204				printf("%s", f->f_un.f_fname);
1205				break;
1206
1207			case F_CONSOLE:
1208			case F_TTY:
1209				printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1210				break;
1211
1212			case F_FORW:
1213				printf("%s", f->f_un.f_forw.f_hname);
1214				break;
1215
1216			case F_PIPE:
1217				printf("%s", f->f_un.f_pipe.f_pname);
1218				break;
1219
1220			case F_USERS:
1221				for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1222					printf("%s, ", f->f_un.f_uname[i]);
1223				break;
1224			}
1225			if(f->f_program) {
1226				printf(" (%s)", f->f_program);
1227			}
1228			printf("\n");
1229		}
1230	}
1231
1232	logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1233	dprintf("syslogd: restarted\n");
1234}
1235
1236/*
1237 * Crack a configuration file line
1238 */
1239void
1240cfline(line, f, prog)
1241	char *line;
1242	struct filed *f;
1243	char *prog;
1244{
1245	struct hostent *hp;
1246	int i, pri;
1247	char *bp, *p, *q;
1248	char buf[MAXLINE], ebuf[100];
1249
1250	dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog);
1251
1252	errno = 0;	/* keep strerror() stuff out of logerror messages */
1253
1254	/* clear out file entry */
1255	memset(f, 0, sizeof(*f));
1256	for (i = 0; i <= LOG_NFACILITIES; i++)
1257		f->f_pmask[i] = INTERNAL_NOPRI;
1258
1259	/* save program name if any */
1260	if(prog && *prog=='*') prog = NULL;
1261	if(prog) {
1262		f->f_program = calloc(1, strlen(prog)+1);
1263		if(f->f_program) {
1264			strcpy(f->f_program, prog);
1265		}
1266	}
1267
1268	/* scan through the list of selectors */
1269	for (p = line; *p && *p != '\t';) {
1270
1271		/* find the end of this facility name list */
1272		for (q = p; *q && *q != '\t' && *q++ != '.'; )
1273			continue;
1274
1275		/* collect priority name */
1276		for (bp = buf; *q && !strchr("\t,;", *q); )
1277			*bp++ = *q++;
1278		*bp = '\0';
1279
1280		/* skip cruft */
1281		while (strchr(", ;", *q))
1282			q++;
1283
1284		/* decode priority name */
1285		if (*buf == '*')
1286			pri = LOG_PRIMASK + 1;
1287		else {
1288			pri = decode(buf, prioritynames);
1289			if (pri < 0) {
1290				(void)snprintf(ebuf, sizeof ebuf,
1291				    "unknown priority name \"%s\"", buf);
1292				logerror(ebuf);
1293				return;
1294			}
1295		}
1296
1297		/* scan facilities */
1298		while (*p && !strchr("\t.;", *p)) {
1299			for (bp = buf; *p && !strchr("\t,;.", *p); )
1300				*bp++ = *p++;
1301			*bp = '\0';
1302			if (*buf == '*')
1303				for (i = 0; i < LOG_NFACILITIES; i++)
1304					f->f_pmask[i] = pri;
1305			else {
1306				i = decode(buf, facilitynames);
1307				if (i < 0) {
1308					(void)snprintf(ebuf, sizeof ebuf,
1309					    "unknown facility name \"%s\"",
1310					    buf);
1311					logerror(ebuf);
1312					return;
1313				}
1314				f->f_pmask[i >> 3] = pri;
1315			}
1316			while (*p == ',' || *p == ' ')
1317				p++;
1318		}
1319
1320		p = q;
1321	}
1322
1323	/* skip to action part */
1324	while (*p == '\t')
1325		p++;
1326
1327	switch (*p)
1328	{
1329	case '@':
1330		(void)strcpy(f->f_un.f_forw.f_hname, ++p);
1331		hp = gethostbyname(p);
1332		if (hp == NULL) {
1333			extern int h_errno;
1334
1335			logerror(hstrerror(h_errno));
1336			break;
1337		}
1338		memset(&f->f_un.f_forw.f_addr, 0,
1339			 sizeof(f->f_un.f_forw.f_addr));
1340		f->f_un.f_forw.f_addr.sin_family = AF_INET;
1341		f->f_un.f_forw.f_addr.sin_port = LogPort;
1342		memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length);
1343		f->f_type = F_FORW;
1344		break;
1345
1346	case '/':
1347		if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
1348			f->f_type = F_UNUSED;
1349			logerror(p);
1350			break;
1351		}
1352		if (isatty(f->f_file)) {
1353			if (strcmp(p, ctty) == 0)
1354				f->f_type = F_CONSOLE;
1355			else
1356				f->f_type = F_TTY;
1357			(void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1);
1358		} else {
1359			(void)strcpy(f->f_un.f_fname, p);
1360			f->f_type = F_FILE;
1361		}
1362		break;
1363
1364	case '|':
1365		f->f_un.f_pipe.f_pid = 0;
1366		(void)strcpy(f->f_un.f_pipe.f_pname, p + 1);
1367		f->f_type = F_PIPE;
1368		break;
1369
1370	case '*':
1371		f->f_type = F_WALL;
1372		break;
1373
1374	default:
1375		for (i = 0; i < MAXUNAMES && *p; i++) {
1376			for (q = p; *q && *q != ','; )
1377				q++;
1378			(void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
1379			if ((q - p) > UT_NAMESIZE)
1380				f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
1381			else
1382				f->f_un.f_uname[i][q - p] = '\0';
1383			while (*q == ',' || *q == ' ')
1384				q++;
1385			p = q;
1386		}
1387		f->f_type = F_USERS;
1388		break;
1389	}
1390}
1391
1392
1393/*
1394 *  Decode a symbolic name to a numeric value
1395 */
1396int
1397decode(name, codetab)
1398	const char *name;
1399	CODE *codetab;
1400{
1401	CODE *c;
1402	char *p, buf[40];
1403
1404	if (isdigit(*name))
1405		return (atoi(name));
1406
1407	for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
1408		if (isupper(*name))
1409			*p = tolower(*name);
1410		else
1411			*p = *name;
1412	}
1413	*p = '\0';
1414	for (c = codetab; c->c_name; c++)
1415		if (!strcmp(buf, c->c_name))
1416			return (c->c_val);
1417
1418	return (-1);
1419}
1420
1421/*
1422 * fork off and become a daemon, but wait for the child to come online
1423 * before returing to the parent, or we get disk thrashing at boot etc.
1424 * Set a timer so we don't hang forever if it wedges.
1425 */
1426int
1427waitdaemon(nochdir, noclose, maxwait)
1428	int nochdir, noclose, maxwait;
1429{
1430	int fd;
1431	int status;
1432	pid_t pid, childpid;
1433
1434	switch (childpid = fork()) {
1435	case -1:
1436		return (-1);
1437	case 0:
1438		break;
1439	default:
1440		signal(SIGALRM, timedout);
1441		alarm(maxwait);
1442		while ((pid = wait3(&status, 0, NULL)) != -1) {
1443			if (WIFEXITED(status))
1444				errx(1, "child pid %d exited with return code %d",
1445					pid, WEXITSTATUS(status));
1446			if (WIFSIGNALED(status))
1447				errx(1, "child pid %d exited on signal %d%s",
1448					pid, WTERMSIG(status),
1449					WCOREDUMP(status) ? " (core dumped)" :
1450					"");
1451			if (pid == childpid)	/* it's gone... */
1452				break;
1453		}
1454		exit(0);
1455	}
1456
1457	if (setsid() == -1)
1458		return (-1);
1459
1460	if (!nochdir)
1461		(void)chdir("/");
1462
1463	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1464		(void)dup2(fd, STDIN_FILENO);
1465		(void)dup2(fd, STDOUT_FILENO);
1466		(void)dup2(fd, STDERR_FILENO);
1467		if (fd > 2)
1468			(void)close (fd);
1469	}
1470	return (getppid());
1471}
1472
1473/*
1474 * We get a SIGALRM from the child when it's running and finished doing it's
1475 * fsync()'s or O_SYNC writes for all the boot messages.
1476 *
1477 * We also get a signal from the kernel if the timer expires, so check to
1478 * see what happened.
1479 */
1480void
1481timedout(sig)
1482	int sig __unused;
1483{
1484	int left;
1485	left = alarm(0);
1486	signal(SIGALRM, SIG_DFL);
1487	if (left == 0)
1488		errx(1, "timed out waiting for child");
1489	else
1490		exit(0);
1491}
1492
1493/*
1494 * Add `s' to the list of allowable peer addresses to accept messages
1495 * from.
1496 *
1497 * `s' is a string in the form:
1498 *
1499 *    [*]domainname[:{servicename|portnumber|*}]
1500 *
1501 * or
1502 *
1503 *    netaddr/maskbits[:{servicename|portnumber|*}]
1504 *
1505 * Returns -1 on error, 0 if the argument was valid.
1506 */
1507int
1508allowaddr(s)
1509	char *s;
1510{
1511	char *cp1, *cp2;
1512	struct allowedpeer ap;
1513	struct servent *se;
1514	regex_t re;
1515	int i;
1516
1517	if ((cp1 = strrchr(s, ':'))) {
1518		/* service/port provided */
1519		*cp1++ = '\0';
1520		if (strlen(cp1) == 1 && *cp1 == '*')
1521			/* any port allowed */
1522			ap.port = htons(0);
1523		else if ((se = getservbyname(cp1, "udp")))
1524			ap.port = se->s_port;
1525		else {
1526			ap.port = htons((int)strtol(cp1, &cp2, 0));
1527			if (*cp2 != '\0')
1528				return -1; /* port not numeric */
1529		}
1530	} else {
1531		if ((se = getservbyname("syslog", "udp")))
1532			ap.port = se->s_port;
1533		else
1534			/* sanity, should not happen */
1535			ap.port = htons(514);
1536	}
1537
1538	/* the regexp's are ugly, but the cleanest way */
1539
1540	if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$",
1541		    REG_EXTENDED))
1542		/* if RE compilation fails, that's an internal error */
1543		abort();
1544	if (regexec(&re, s, 0, 0, 0) == 0) {
1545		/* arg `s' is numeric */
1546		ap.isnumeric = 1;
1547		if ((cp1 = strchr(s, '/')) != NULL) {
1548			*cp1++ = '\0';
1549			i = atoi(cp1);
1550			if (i < 0 || i > 32)
1551				return -1;
1552			/* convert masklen to netmask */
1553			ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1));
1554		}
1555		if (ascii2addr(AF_INET, s, &ap.a_addr) == -1)
1556			return -1;
1557		if (cp1 == NULL) {
1558			/* use default netmask */
1559			if (IN_CLASSA(ntohl(ap.a_addr.s_addr)))
1560				ap.a_mask.s_addr = htonl(IN_CLASSA_NET);
1561			else if (IN_CLASSB(ntohl(ap.a_addr.s_addr)))
1562				ap.a_mask.s_addr = htonl(IN_CLASSB_NET);
1563			else
1564				ap.a_mask.s_addr = htonl(IN_CLASSC_NET);
1565		}
1566	} else {
1567		/* arg `s' is domain name */
1568		ap.isnumeric = 0;
1569		ap.a_name = s;
1570	}
1571	regfree(&re);
1572
1573	if (Debug) {
1574		printf("allowaddr: rule %d: ", NumAllowed);
1575		if (ap.isnumeric) {
1576			printf("numeric, ");
1577			printf("addr = %s, ",
1578			       addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0));
1579			printf("mask = %s; ",
1580			       addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0));
1581		} else
1582			printf("domainname = %s; ", ap.a_name);
1583		printf("port = %d\n", ntohs(ap.port));
1584	}
1585
1586	if ((AllowedPeers = realloc(AllowedPeers,
1587				    ++NumAllowed * sizeof(struct allowedpeer)))
1588	    == NULL) {
1589		fprintf(stderr, "Out of memory!\n");
1590		exit(EX_OSERR);
1591	}
1592	memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
1593	return 0;
1594}
1595
1596/*
1597 * Validate that the remote peer has permission to log to us.
1598 */
1599int
1600validate(sin, hname)
1601	struct sockaddr_in *sin;
1602	const char *hname;
1603{
1604	int i;
1605	size_t l1, l2;
1606	char *cp, name[MAXHOSTNAMELEN];
1607	struct allowedpeer *ap;
1608
1609	if (NumAllowed == 0)
1610		/* traditional behaviour, allow everything */
1611		return 1;
1612
1613	strncpy(name, hname, sizeof name);
1614	if (strchr(name, '.') == NULL) {
1615		strncat(name, ".", sizeof name - strlen(name) - 1);
1616		strncat(name, LocalDomain, sizeof name - strlen(name) - 1);
1617	}
1618	dprintf("validate: dgram from IP %s, port %d, name %s;\n",
1619		addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0),
1620		ntohs(sin->sin_port), name);
1621
1622	/* now, walk down the list */
1623	for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
1624		if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) {
1625			dprintf("rejected in rule %d due to port mismatch.\n", i);
1626			continue;
1627		}
1628
1629		if (ap->isnumeric) {
1630			if ((sin->sin_addr.s_addr & ap->a_mask.s_addr)
1631			    != ap->a_addr.s_addr) {
1632				dprintf("rejected in rule %d due to IP mismatch.\n", i);
1633				continue;
1634			}
1635		} else {
1636			cp = ap->a_name;
1637			l1 = strlen(name);
1638			if (*cp == '*') {
1639				/* allow wildmatch */
1640				cp++;
1641				l2 = strlen(cp);
1642				if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
1643					dprintf("rejected in rule %d due to name mismatch.\n", i);
1644					continue;
1645				}
1646			} else {
1647				/* exact match */
1648				l2 = strlen(cp);
1649				if (l2 != l1 || memcmp(cp, name, l1) != 0) {
1650					dprintf("rejected in rule %d due to name mismatch.\n", i);
1651					continue;
1652				}
1653			}
1654		}
1655		dprintf("accepted in rule %d.\n", i);
1656		return 1;	/* hooray! */
1657	}
1658	return 0;
1659}
1660
1661/*
1662 * Fairly similar to popen(3), but returns an open descriptor, as
1663 * opposed to a FILE *.
1664 */
1665int
1666p_open(prog, pid)
1667	char *prog;
1668	pid_t *pid;
1669{
1670	int pfd[2], nulldesc, i;
1671	sigset_t omask, mask;
1672	char *argv[4]; /* sh -c cmd NULL */
1673	char errmsg[200];
1674
1675	if (pipe(pfd) == -1)
1676		return -1;
1677	if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
1678		/* we are royally screwed anyway */
1679		return -1;
1680
1681	sigemptyset(&mask);
1682	sigaddset(&mask, SIGALRM);
1683	sigaddset(&mask, SIGHUP);
1684	sigprocmask(SIG_BLOCK, &mask, &omask);
1685	switch ((*pid = fork())) {
1686	case -1:
1687		sigprocmask(SIG_SETMASK, &omask, 0);
1688		close(nulldesc);
1689		return -1;
1690
1691	case 0:
1692		argv[0] = "sh";
1693		argv[1] = "-c";
1694		argv[2] = prog;
1695		argv[3] = NULL;
1696
1697		alarm(0);
1698		(void)setsid();	/* Avoid catching SIGHUPs. */
1699
1700		/*
1701		 * Throw away pending signals, and reset signal
1702		 * behaviour to standard values.
1703		 */
1704		signal(SIGALRM, SIG_IGN);
1705		signal(SIGHUP, SIG_IGN);
1706		sigprocmask(SIG_SETMASK, &omask, 0);
1707		signal(SIGPIPE, SIG_DFL);
1708		signal(SIGQUIT, SIG_DFL);
1709		signal(SIGALRM, SIG_DFL);
1710		signal(SIGHUP, SIG_DFL);
1711
1712		dup2(pfd[0], STDIN_FILENO);
1713		dup2(nulldesc, STDOUT_FILENO);
1714		dup2(nulldesc, STDERR_FILENO);
1715		for (i = getdtablesize(); i > 2; i--)
1716			(void) close(i);
1717
1718		(void) execvp(_PATH_BSHELL, argv);
1719		_exit(255);
1720	}
1721
1722	sigprocmask(SIG_SETMASK, &omask, 0);
1723	close(nulldesc);
1724	close(pfd[0]);
1725	/*
1726	 * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
1727	 * supposed to get an EWOULDBLOCK on writev(2), which is
1728	 * caught by the logic above anyway, which will in turn close
1729	 * the pipe, and fork a new logging subprocess if necessary.
1730	 * The stale subprocess will be killed some time later unless
1731	 * it terminated itself due to closing its input pipe (so we
1732	 * get rid of really dead puppies).
1733	 */
1734	if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
1735		/* This is bad. */
1736		(void)snprintf(errmsg, sizeof errmsg,
1737			       "Warning: cannot change pipe to PID %d to "
1738			       "non-blocking behaviour.",
1739			       (int)*pid);
1740		logerror(errmsg);
1741	}
1742	return pfd[1];
1743}
1744
1745void
1746deadq_enter(pid)
1747	pid_t pid;
1748{
1749	dq_t p;
1750
1751	p = malloc(sizeof(struct deadq_entry));
1752	if (p == 0) {
1753		errno = 0;
1754		logerror("panic: out of virtual memory!");
1755		exit(1);
1756	}
1757
1758	p->dq_pid = pid;
1759	p->dq_timeout = DQ_TIMO_INIT;
1760	TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
1761}
1762