syslogd.c revision 93077 
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 93077 2002-03-24 05:24:04Z des $";
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 <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
110#include "pathnames.h"
111#include "ttymsg.h"
112
113#define SYSLOG_NAMES
114#include <sys/syslog.h>
115
116#ifdef NI_WITHSCOPEID
117static const int withscopeid = NI_WITHSCOPEID;
118#else
119static const int withscopeid = 0;
120#endif
121
122const char	*ConfFile = _PATH_LOGCONF;
123const char	*PidFile = _PATH_LOGPID;
124const char	ctty[] = _PATH_CONSOLE;
125
126#define	dprintf		if (Debug) printf
127
128#define MAXUNAMES	20	/* maximum number of user names */
129
130#define MAXFUNIX       20
131
132int nfunix = 1;
133const char *funixn[MAXFUNIX] = { _PATH_LOG };
134int funix[MAXFUNIX];
135
136/*
137 * Flags to logmsg().
138 */
139
140#define IGN_CONS	0x001	/* don't print on console */
141#define SYNC_FILE	0x002	/* do fsync on file after printing */
142#define ADDDATE		0x004	/* add a date to the message */
143#define MARK		0x008	/* this message is a mark */
144#define ISKERNEL	0x010	/* kernel generated message */
145
146/*
147 * This structure represents the files that will have log
148 * copies printed.
149 */
150
151struct filed {
152	struct	filed *f_next;		/* next in linked list */
153	short	f_type;			/* entry type, see below */
154	short	f_file;			/* file descriptor */
155	time_t	f_time;			/* time this was last written */
156	char	*f_host;		/* host from which to recd. */
157	u_char	f_pmask[LOG_NFACILITIES+1];	/* priority mask */
158	u_char	f_pcmp[LOG_NFACILITIES+1];	/* compare priority */
159#define PRI_LT	0x1
160#define PRI_EQ	0x2
161#define PRI_GT	0x4
162	char	*f_program;		/* program this applies to */
163	union {
164		char	f_uname[MAXUNAMES][UT_NAMESIZE+1];
165		struct {
166			char	f_hname[MAXHOSTNAMELEN];
167			struct addrinfo *f_addr;
168
169		} f_forw;		/* forwarding address */
170		char	f_fname[MAXPATHLEN];
171		struct {
172			char	f_pname[MAXPATHLEN];
173			pid_t	f_pid;
174		} f_pipe;
175	} f_un;
176	char	f_prevline[MAXSVLINE];		/* last message logged */
177	char	f_lasttime[16];			/* time of last occurrence */
178	char	f_prevhost[MAXHOSTNAMELEN];	/* host from which recd. */
179	int	f_prevpri;			/* pri of f_prevline */
180	int	f_prevlen;			/* length of f_prevline */
181	int	f_prevcount;			/* repetition cnt of prevline */
182	u_int	f_repeatcount;			/* number of "repeated" msgs */
183};
184
185/*
186 * Queue of about-to-be dead processes we should watch out for.
187 */
188
189TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
190struct stailhead *deadq_headp;
191
192struct deadq_entry {
193	pid_t				dq_pid;
194	int				dq_timeout;
195	TAILQ_ENTRY(deadq_entry)	dq_entries;
196};
197
198/*
199 * The timeout to apply to processes waiting on the dead queue.  Unit
200 * of measure is `mark intervals', i.e. 20 minutes by default.
201 * Processes on the dead queue will be terminated after that time.
202 */
203
204#define DQ_TIMO_INIT	2
205
206typedef struct deadq_entry *dq_t;
207
208
209/*
210 * Struct to hold records of network addresses that are allowed to log
211 * to us.
212 */
213struct allowedpeer {
214	int isnumeric;
215	u_short port;
216	union {
217		struct {
218			struct sockaddr_storage addr;
219			struct sockaddr_storage mask;
220		} numeric;
221		char *name;
222	} u;
223#define a_addr u.numeric.addr
224#define a_mask u.numeric.mask
225#define a_name u.name
226};
227
228
229/*
230 * Intervals at which we flush out "message repeated" messages,
231 * in seconds after previous message is logged.  After each flush,
232 * we move to the next interval until we reach the largest.
233 */
234int	repeatinterval[] = { 30, 120, 600 };	/* # of secs before flush */
235#define	MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
236#define	REPEATTIME(f)	((f)->f_time + repeatinterval[(f)->f_repeatcount])
237#define	BACKOFF(f)	{ if (++(f)->f_repeatcount > MAXREPEAT) \
238				 (f)->f_repeatcount = MAXREPEAT; \
239			}
240
241/* values for f_type */
242#define F_UNUSED	0		/* unused entry */
243#define F_FILE		1		/* regular file */
244#define F_TTY		2		/* terminal */
245#define F_CONSOLE	3		/* console terminal */
246#define F_FORW		4		/* remote machine */
247#define F_USERS		5		/* list of users */
248#define F_WALL		6		/* everyone logged on */
249#define F_PIPE		7		/* pipe to program */
250
251const char *TypeNames[8] = {
252	"UNUSED",	"FILE",		"TTY",		"CONSOLE",
253	"FORW",		"USERS",	"WALL",		"PIPE"
254};
255
256struct	filed *Files;
257struct	filed consfile;
258
259int	Debug;			/* debug flag */
260int	resolve = 1;		/* resolve hostname */
261char	LocalHostName[MAXHOSTNAMELEN];	/* our hostname */
262const char	*LocalDomain;		/* our local domain name */
263int	*finet = NULL;		/* Internet datagram socket */
264int	fklog = -1;		/* /dev/klog */
265int	Initialized = 0;	/* set when we have initialized ourselves */
266int	MarkInterval = 20 * 60;	/* interval between marks in seconds */
267int	MarkSeq = 0;		/* mark sequence number */
268int	SecureMode = 0;		/* when true, receive only unix domain socks */
269#ifdef INET6
270int	family = PF_UNSPEC;	/* protocol family (IPv4, IPv6 or both) */
271#else
272int	family = PF_INET;	/* protocol family (IPv4 only) */
273#endif
274int	send_to_all = 0;	/* send message to all IPv4/IPv6 addresses */
275int	use_bootfile = 0;	/* log entire bootfile for every kern msg */
276int	no_compress = 0;	/* don't compress messages (1=pipes, 2=all) */
277
278char	bootfile[MAXLINE+1];	/* booted kernel file */
279
280struct allowedpeer *AllowedPeers;
281int	NumAllowed = 0;		/* # of AllowedPeer entries */
282
283int	UniquePriority = 0;	/* Only log specified priority? */
284int	LogFacPri = 0;		/* Put facility and priority in log message: */
285				/* 0=no, 1=numeric, 2=names */
286int	KeepKernFac = 0;	/* Keep remotely logged kernel facility */
287
288volatile sig_atomic_t MarkSet, WantDie;
289
290int	allowaddr(char *);
291void	cfline(const char *, struct filed *, const char *, const char *);
292const char	*cvthname(struct sockaddr *);
293void	deadq_enter(pid_t, const char *);
294int	deadq_remove(pid_t);
295int	decode(const char *, CODE *);
296void	die(int);
297void	dodie(int);
298void	domark(int);
299void	fprintlog(struct filed *, int, const char *);
300int*	socksetup(int, const char *);
301void	init(int);
302void	logerror(const char *);
303void	logmsg(int, const char *, const char *, int);
304void	log_deadchild(pid_t, int, const char *);
305void	markit(void);
306void	printline(const char *, char *);
307void	printsys(char *);
308int	p_open(const char *, pid_t *);
309void	readklog(void);
310void	reapchild(int);
311static void	usage(void);
312int	validate(struct sockaddr *, const char *);
313static void	unmapped(struct sockaddr *);
314void	wallmsg(struct filed *, struct iovec *);
315int	waitdaemon(int, int, int);
316void	timedout(int);
317
318int
319main(argc, argv)
320	int argc;
321	char *argv[];
322{
323	int ch, i, fdsrmax = 0, l;
324	struct sockaddr_un sunx, fromunix;
325	struct sockaddr_storage frominet;
326	fd_set *fdsr = NULL;
327	FILE *fp;
328	char line[MAXLINE + 1];
329	const char *bindhostname, *hname;
330	struct timeval tv, *tvp;
331	struct sigaction sact;
332	sigset_t mask;
333	pid_t ppid = 1;
334	socklen_t len;
335
336	bindhostname = NULL;
337	while ((ch = getopt(argc, argv, "46Aa:b:cdf:kl:m:nop:P:suv")) != -1)
338		switch (ch) {
339		case '4':
340			family = PF_INET;
341			break;
342#ifdef INET6
343		case '6':
344			family = PF_INET6;
345			break;
346#endif
347		case 'A':
348			send_to_all++;
349			break;
350		case 'a':		/* allow specific network addresses only */
351			if (allowaddr(optarg) == -1)
352				usage();
353			break;
354		case 'b':
355			bindhostname = optarg;
356			break;
357		case 'c':
358			no_compress++;
359			break;
360		case 'd':		/* debug */
361			Debug++;
362			break;
363		case 'f':		/* configuration file */
364			ConfFile = optarg;
365			break;
366		case 'k':		/* keep remote kern fac */
367			KeepKernFac = 1;
368			break;
369		case 'l':
370			if (nfunix < MAXFUNIX)
371				funixn[nfunix++] = optarg;
372			else
373				warnx("out of descriptors, ignoring %s",
374					optarg);
375			break;
376		case 'm':		/* mark interval */
377			MarkInterval = atoi(optarg) * 60;
378			break;
379		case 'n':
380			resolve = 0;
381			break;
382		case 'o':
383			use_bootfile = 1;
384			break;
385		case 'p':		/* path */
386			funixn[0] = optarg;
387			break;
388		case 'P':		/* path for alt. PID */
389			PidFile = optarg;
390			break;
391		case 's':		/* no network mode */
392			SecureMode++;
393			break;
394		case 'u':		/* only log specified priority */
395		        UniquePriority++;
396			break;
397		case 'v':		/* log facility and priority */
398		  	LogFacPri++;
399			break;
400		case '?':
401		default:
402			usage();
403		}
404	if ((argc -= optind) != 0)
405		usage();
406
407	if (!Debug) {
408		ppid = waitdaemon(0, 0, 30);
409		if (ppid < 0)
410			err(1, "could not become daemon");
411	} else
412		setlinebuf(stdout);
413
414	if (NumAllowed)
415		endservent();
416
417	consfile.f_type = F_CONSOLE;
418	(void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
419	    sizeof(consfile.f_un.f_fname));
420	(void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
421	(void)signal(SIGTERM, dodie);
422	(void)signal(SIGINT, Debug ? dodie : SIG_IGN);
423	(void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
424	/*
425	 * We don't want the SIGCHLD and SIGHUP handlers to interfere
426	 * with each other; they are likely candidates for being called
427	 * simultaneously (SIGHUP closes pipe descriptor, process dies,
428	 * SIGCHLD happens).
429	 */
430	sigemptyset(&mask);
431	sigaddset(&mask, SIGHUP);
432	sact.sa_handler = reapchild;
433	sact.sa_mask = mask;
434	sact.sa_flags = SA_RESTART;
435	(void)sigaction(SIGCHLD, &sact, NULL);
436	(void)signal(SIGALRM, domark);
437	(void)signal(SIGPIPE, SIG_IGN);	/* We'll catch EPIPE instead. */
438	(void)alarm(TIMERINTVL);
439
440	TAILQ_INIT(&deadq_head);
441
442#ifndef SUN_LEN
443#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
444#endif
445	for (i = 0; i < nfunix; i++) {
446		(void)unlink(funixn[i]);
447		memset(&sunx, 0, sizeof(sunx));
448		sunx.sun_family = AF_UNIX;
449		(void)strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path));
450		funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0);
451		if (funix[i] < 0 ||
452		    bind(funix[i], (struct sockaddr *)&sunx,
453			 SUN_LEN(&sunx)) < 0 ||
454		    chmod(funixn[i], 0666) < 0) {
455			(void) snprintf(line, sizeof line,
456					"cannot create %s", funixn[i]);
457			logerror(line);
458			dprintf("cannot create %s (%d)\n", funixn[i], errno);
459			if (i == 0)
460				die(0);
461		}
462	}
463	if (SecureMode <= 1)
464		finet = socksetup(family, bindhostname);
465
466	if (finet) {
467		if (SecureMode) {
468			for (i = 0; i < *finet; i++) {
469				if (shutdown(finet[i+1], SHUT_RD) < 0) {
470					logerror("shutdown");
471					if (!Debug)
472						die(0);
473				}
474			}
475		} else
476			dprintf("listening on inet and/or inet6 socket\n");
477		dprintf("sending on inet and/or inet6 socket\n");
478	}
479
480	if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
481		if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
482			fklog = -1;
483	if (fklog < 0)
484		dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
485
486	/* tuck my process id away */
487	fp = fopen(PidFile, "w");
488	if (fp != NULL) {
489		fprintf(fp, "%d\n", getpid());
490		(void) fclose(fp);
491	}
492
493	dprintf("off & running....\n");
494
495	init(0);
496	/* prevent SIGHUP and SIGCHLD handlers from running in parallel */
497	sigemptyset(&mask);
498	sigaddset(&mask, SIGCHLD);
499	sact.sa_handler = init;
500	sact.sa_mask = mask;
501	sact.sa_flags = SA_RESTART;
502	(void)sigaction(SIGHUP, &sact, NULL);
503
504	tvp = &tv;
505	tv.tv_sec = tv.tv_usec = 0;
506
507	if (fklog != -1 && fklog > fdsrmax)
508		fdsrmax = fklog;
509	if (finet && !SecureMode) {
510		for (i = 0; i < *finet; i++) {
511		    if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
512			fdsrmax = finet[i+1];
513		}
514	}
515	for (i = 0; i < nfunix; i++) {
516		if (funix[i] != -1 && funix[i] > fdsrmax)
517			fdsrmax = funix[i];
518	}
519
520	fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
521	    sizeof(fd_mask));
522	if (fdsr == NULL)
523		errx(1, "calloc fd_set");
524
525	for (;;) {
526		if (MarkSet)
527			markit();
528		if (WantDie)
529			die(WantDie);
530
531		bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
532		    sizeof(fd_mask));
533
534		if (fklog != -1)
535			FD_SET(fklog, fdsr);
536		if (finet && !SecureMode) {
537			for (i = 0; i < *finet; i++) {
538				if (finet[i+1] != -1)
539					FD_SET(finet[i+1], fdsr);
540			}
541		}
542		for (i = 0; i < nfunix; i++) {
543			if (funix[i] != -1)
544				FD_SET(funix[i], fdsr);
545		}
546
547		i = select(fdsrmax+1, fdsr, NULL, NULL, tvp);
548		switch (i) {
549		case 0:
550			if (tvp) {
551				tvp = NULL;
552				if (ppid != 1)
553					kill(ppid, SIGALRM);
554			}
555			continue;
556		case -1:
557			if (errno != EINTR)
558				logerror("select");
559			continue;
560		}
561		if (fklog != -1 && FD_ISSET(fklog, fdsr))
562			readklog();
563		if (finet && !SecureMode) {
564			for (i = 0; i < *finet; i++) {
565				if (FD_ISSET(finet[i+1], fdsr)) {
566					len = sizeof(frominet);
567					l = recvfrom(finet[i+1], line, MAXLINE,
568					     0, (struct sockaddr *)&frominet,
569					     &len);
570					if (l > 0) {
571						line[l] = '\0';
572						hname = cvthname((struct sockaddr *)&frominet);
573						unmapped((struct sockaddr *)&frominet);
574						if (validate((struct sockaddr *)&frominet, hname))
575							printline(hname, line);
576					} else if (l < 0 && errno != EINTR)
577						logerror("recvfrom inet");
578				}
579			}
580		}
581		for (i = 0; i < nfunix; i++) {
582			if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) {
583				len = sizeof(fromunix);
584				l = recvfrom(funix[i], line, MAXLINE, 0,
585				    (struct sockaddr *)&fromunix, &len);
586				if (l > 0) {
587					line[l] = '\0';
588					printline(LocalHostName, line);
589				} else if (l < 0 && errno != EINTR)
590					logerror("recvfrom unix");
591			}
592		}
593	}
594	if (fdsr)
595		free(fdsr);
596}
597
598static void
599unmapped(sa)
600	struct sockaddr *sa;
601{
602	struct sockaddr_in6 *sin6;
603	struct sockaddr_in sin4;
604
605	if (sa->sa_family != AF_INET6)
606		return;
607	if (sa->sa_len != sizeof(struct sockaddr_in6) ||
608	    sizeof(sin4) > sa->sa_len)
609		return;
610	sin6 = (struct sockaddr_in6 *)sa;
611	if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
612		return;
613
614	memset(&sin4, 0, sizeof(sin4));
615	sin4.sin_family = AF_INET;
616	sin4.sin_len = sizeof(struct sockaddr_in);
617	memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
618	       sizeof(sin4.sin_addr));
619	sin4.sin_port = sin6->sin6_port;
620
621	memcpy(sa, &sin4, sin4.sin_len);
622}
623
624static void
625usage()
626{
627
628	fprintf(stderr, "%s\n%s\n%s\n",
629		"usage: syslogd [-46Adnsuv] [-a allowed_peer] [-f config_file]",
630		"               [-m mark_interval] [-l log_socket]",
631		"               [-p log_socket] [-P pid_file]");
632	exit(1);
633}
634
635/*
636 * Take a raw input line, decode the message, and print the message
637 * on the appropriate log files.
638 */
639void
640printline(hname, msg)
641	const char *hname;
642	char *msg;
643{
644	int c, pri;
645	char *p, *q, line[MAXLINE + 1];
646
647	/* test for special codes */
648	pri = DEFUPRI;
649	p = msg;
650	if (*p == '<') {
651		pri = 0;
652		while (isdigit(*++p))
653			pri = 10 * pri + (*p - '0');
654		if (*p == '>')
655			++p;
656	}
657	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
658		pri = DEFUPRI;
659
660	/* don't allow users to log kernel messages */
661	if (LOG_FAC(pri) == LOG_KERN && !KeepKernFac)
662		pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
663
664	q = line;
665
666	while ((c = (unsigned char)*p++) != '\0' &&
667	    q < &line[sizeof(line) - 4]) {
668		if ((c & 0x80) && c < 0xA0) {
669			c &= 0x7F;
670			*q++ = 'M';
671			*q++ = '-';
672		}
673		if (isascii(c) && iscntrl(c)) {
674			if (c == '\n')
675				*q++ = ' ';
676			else if (c == '\t')
677				*q++ = '\t';
678			else {
679				*q++ = '^';
680				*q++ = c ^ 0100;
681			}
682		} else
683			*q++ = c;
684	}
685	*q = '\0';
686
687	logmsg(pri, line, hname, 0);
688}
689
690/*
691 * Read /dev/klog while data are available, split into lines.
692 */
693void
694readklog()
695{
696	char *p, *q, line[MAXLINE + 1];
697	int len, i;
698
699	len = 0;
700	for (;;) {
701		i = read(fklog, line + len, MAXLINE - 1 - len);
702		if (i > 0)
703			line[i + len] = '\0';
704		else if (i < 0 && errno != EINTR && errno != EAGAIN) {
705			logerror("klog");
706			fklog = -1;
707			break;
708		} else
709			break;
710
711		for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
712			*q = '\0';
713			printsys(p);
714		}
715		len = strlen(p);
716		if (len >= MAXLINE - 1) {
717			printsys(p);
718			len = 0;
719		}
720		if (len > 0)
721			memmove(line, p, len + 1);
722	}
723	if (len > 0)
724		printsys(line);
725}
726
727/*
728 * Take a raw input line from /dev/klog, format similar to syslog().
729 */
730void
731printsys(p)
732	char *p;
733{
734	int pri, flags;
735
736	flags = ISKERNEL | SYNC_FILE | ADDDATE;	/* fsync after write */
737	pri = DEFSPRI;
738	if (*p == '<') {
739		pri = 0;
740		while (isdigit(*++p))
741			pri = 10 * pri + (*p - '0');
742		if (*p == '>')
743			++p;
744		if ((pri & LOG_FACMASK) == LOG_CONSOLE)
745			flags |= IGN_CONS;
746	} else {
747		/* kernel printf's come out on console */
748		flags |= IGN_CONS;
749	}
750	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
751		pri = DEFSPRI;
752	logmsg(pri, p, LocalHostName, flags);
753}
754
755time_t	now;
756
757/*
758 * Log a message to the appropriate log files, users, etc. based on
759 * the priority.
760 */
761void
762logmsg(pri, msg, from, flags)
763	int pri;
764	const char *msg, *from;
765	int flags;
766{
767	struct filed *f;
768	int i, fac, msglen, omask, prilev;
769	const char *timestamp;
770 	char prog[NAME_MAX+1];
771	char buf[MAXLINE+1];
772
773	dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
774	    pri, flags, from, msg);
775
776	omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
777
778	/*
779	 * Check to see if msg looks non-standard.
780	 */
781	msglen = strlen(msg);
782	if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
783	    msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
784		flags |= ADDDATE;
785
786	(void)time(&now);
787	if (flags & ADDDATE)
788		timestamp = ctime(&now) + 4;
789	else {
790		timestamp = msg;
791		msg += 16;
792		msglen -= 16;
793	}
794
795	/* skip leading blanks */
796	while (isspace(*msg)) {
797		msg++;
798		msglen--;
799	}
800
801	/* extract facility and priority level */
802	if (flags & MARK)
803		fac = LOG_NFACILITIES;
804	else
805		fac = LOG_FAC(pri);
806	prilev = LOG_PRI(pri);
807
808	/* extract program name */
809	for (i = 0; i < NAME_MAX; i++) {
810		if (!isalnum(msg[i]))
811			break;
812		prog[i] = msg[i];
813	}
814	prog[i] = 0;
815
816	/* add kernel prefix for kernel messages */
817	if (flags & ISKERNEL) {
818		snprintf(buf, sizeof(buf), "%s: %s",
819		    use_bootfile ? bootfile : "kernel", msg);
820		msg = buf;
821		msglen = strlen(buf);
822	}
823
824	/* log the message to the particular outputs */
825	if (!Initialized) {
826		f = &consfile;
827		f->f_file = open(ctty, O_WRONLY, 0);
828
829		if (f->f_file >= 0) {
830			fprintlog(f, flags, msg);
831			(void)close(f->f_file);
832		}
833		(void)sigsetmask(omask);
834		return;
835	}
836	for (f = Files; f; f = f->f_next) {
837		/* skip messages that are incorrect priority */
838		if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
839		     ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
840		     ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
841		     )
842		    || f->f_pmask[fac] == INTERNAL_NOPRI)
843			continue;
844		/* skip messages with the incorrect hostname */
845		if (f->f_host)
846			switch (f->f_host[0]) {
847			case '+':
848				if (strcmp(from, f->f_host + 1) != 0)
849					continue;
850				break;
851			case '-':
852				if (strcmp(from, f->f_host + 1) == 0)
853					continue;
854				break;
855			}
856
857		/* skip messages with the incorrect program name */
858		if (f->f_program)
859			if (strcmp(prog, f->f_program) != 0)
860				continue;
861
862		if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
863			continue;
864
865		/* don't output marks to recently written files */
866		if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
867			continue;
868
869		/*
870		 * suppress duplicate lines to this file
871		 */
872		if (no_compress - (f->f_type != F_PIPE) < 1 &&
873		    (flags & MARK) == 0 && msglen == f->f_prevlen &&
874		    !strcmp(msg, f->f_prevline) &&
875		    !strcasecmp(from, f->f_prevhost)) {
876			(void)strlcpy(f->f_lasttime, timestamp, 16);
877			f->f_prevcount++;
878			dprintf("msg repeated %d times, %ld sec of %d\n",
879			    f->f_prevcount, (long)(now - f->f_time),
880			    repeatinterval[f->f_repeatcount]);
881			/*
882			 * If domark would have logged this by now,
883			 * flush it now (so we don't hold isolated messages),
884			 * but back off so we'll flush less often
885			 * in the future.
886			 */
887			if (now > REPEATTIME(f)) {
888				fprintlog(f, flags, (char *)NULL);
889				BACKOFF(f);
890			}
891		} else {
892			/* new line, save it */
893			if (f->f_prevcount)
894				fprintlog(f, 0, (char *)NULL);
895			f->f_repeatcount = 0;
896			f->f_prevpri = pri;
897			(void)strlcpy(f->f_lasttime, timestamp, 16);
898			(void)strlcpy(f->f_prevhost, from,
899			    sizeof(f->f_prevhost));
900			if (msglen < MAXSVLINE) {
901				f->f_prevlen = msglen;
902				(void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
903				fprintlog(f, flags, (char *)NULL);
904			} else {
905				f->f_prevline[0] = 0;
906				f->f_prevlen = 0;
907				fprintlog(f, flags, msg);
908			}
909		}
910	}
911	(void)sigsetmask(omask);
912}
913
914void
915fprintlog(f, flags, msg)
916	struct filed *f;
917	int flags;
918	const char *msg;
919{
920	struct iovec iov[7];
921	struct iovec *v;
922	struct addrinfo *r;
923	int i, l, lsent = 0;
924	char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
925	const char *msgret;
926
927	v = iov;
928	if (f->f_type == F_WALL) {
929		v->iov_base = greetings;
930		v->iov_len = snprintf(greetings, sizeof greetings,
931		    "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
932		    f->f_prevhost, ctime(&now));
933		if (v->iov_len > 0)
934			v++;
935		v->iov_base = "";
936		v->iov_len = 0;
937		v++;
938	} else {
939		v->iov_base = f->f_lasttime;
940		v->iov_len = 15;
941		v++;
942		v->iov_base = " ";
943		v->iov_len = 1;
944		v++;
945	}
946
947	if (LogFacPri) {
948	  	static char fp_buf[30];	/* Hollow laugh */
949		int fac = f->f_prevpri & LOG_FACMASK;
950		int pri = LOG_PRI(f->f_prevpri);
951		const char *f_s = NULL;
952		char f_n[5];	/* Hollow laugh */
953		const char *p_s = NULL;
954		char p_n[5];	/* Hollow laugh */
955
956		if (LogFacPri > 1) {
957		  CODE *c;
958
959		  for (c = facilitynames; c->c_name; c++) {
960		    if (c->c_val == fac) {
961		      f_s = c->c_name;
962		      break;
963		    }
964		  }
965		  for (c = prioritynames; c->c_name; c++) {
966		    if (c->c_val == pri) {
967		      p_s = c->c_name;
968		      break;
969		    }
970		  }
971		}
972		if (!f_s) {
973		  snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
974		  f_s = f_n;
975		}
976		if (!p_s) {
977		  snprintf(p_n, sizeof p_n, "%d", pri);
978		  p_s = p_n;
979		}
980		snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
981		v->iov_base = fp_buf;
982		v->iov_len = strlen(fp_buf);
983	} else {
984	        v->iov_base="";
985		v->iov_len = 0;
986	}
987	v++;
988
989	v->iov_base = f->f_prevhost;
990	v->iov_len = strlen(v->iov_base);
991	v++;
992	v->iov_base = " ";
993	v->iov_len = 1;
994	v++;
995
996	if (msg) {
997		wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
998		if (wmsg == NULL) {
999			logerror("strdup");
1000			exit(1);
1001		}
1002		v->iov_base = wmsg;
1003		v->iov_len = strlen(msg);
1004	} else if (f->f_prevcount > 1) {
1005		v->iov_base = repbuf;
1006		v->iov_len = snprintf(repbuf, sizeof repbuf,
1007		    "last message repeated %d times", f->f_prevcount);
1008	} else {
1009		v->iov_base = f->f_prevline;
1010		v->iov_len = f->f_prevlen;
1011	}
1012	v++;
1013
1014	dprintf("Logging to %s", TypeNames[f->f_type]);
1015	f->f_time = now;
1016
1017	switch (f->f_type) {
1018	case F_UNUSED:
1019		dprintf("\n");
1020		break;
1021
1022	case F_FORW:
1023		dprintf(" %s\n", f->f_un.f_forw.f_hname);
1024		/* check for local vs remote messages */
1025		if (strcasecmp(f->f_prevhost, LocalHostName))
1026			l = snprintf(line, sizeof line - 1,
1027			    "<%d>%.15s Forwarded from %s: %s",
1028			    f->f_prevpri, iov[0].iov_base, f->f_prevhost,
1029			    iov[5].iov_base);
1030		else
1031			l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1032			     f->f_prevpri, iov[0].iov_base, iov[5].iov_base);
1033		if (l < 0)
1034			l = 0;
1035		else if (l > MAXLINE)
1036			l = MAXLINE;
1037
1038		if (finet) {
1039			for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1040				for (i = 0; i < *finet; i++) {
1041#if 0
1042					/*
1043					 * should we check AF first, or just
1044					 * trial and error? FWD
1045					 */
1046					if (r->ai_family ==
1047					    address_family_of(finet[i+1]))
1048#endif
1049					lsent = sendto(finet[i+1], line, l, 0,
1050					    r->ai_addr, r->ai_addrlen);
1051					if (lsent == l)
1052						break;
1053				}
1054				if (lsent == l && !send_to_all)
1055					break;
1056			}
1057			if (lsent != l) {
1058				int e = errno;
1059				(void)close(f->f_file);
1060				errno = e;
1061				f->f_type = F_UNUSED;
1062				logerror("sendto");
1063			}
1064		}
1065		break;
1066
1067	case F_FILE:
1068		dprintf(" %s\n", f->f_un.f_fname);
1069		v->iov_base = "\n";
1070		v->iov_len = 1;
1071		if (writev(f->f_file, iov, 7) < 0) {
1072			int e = errno;
1073			(void)close(f->f_file);
1074			f->f_type = F_UNUSED;
1075			errno = e;
1076			logerror(f->f_un.f_fname);
1077		} else if (flags & SYNC_FILE)
1078			(void)fsync(f->f_file);
1079		break;
1080
1081	case F_PIPE:
1082		dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1083		v->iov_base = "\n";
1084		v->iov_len = 1;
1085		if (f->f_un.f_pipe.f_pid == 0) {
1086			if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1087						&f->f_un.f_pipe.f_pid)) < 0) {
1088				f->f_type = F_UNUSED;
1089				logerror(f->f_un.f_pipe.f_pname);
1090				break;
1091			}
1092		}
1093		if (writev(f->f_file, iov, 7) < 0) {
1094			int e = errno;
1095			(void)close(f->f_file);
1096			if (f->f_un.f_pipe.f_pid > 0)
1097				deadq_enter(f->f_un.f_pipe.f_pid,
1098					    f->f_un.f_pipe.f_pname);
1099			f->f_un.f_pipe.f_pid = 0;
1100			errno = e;
1101			logerror(f->f_un.f_pipe.f_pname);
1102		}
1103		break;
1104
1105	case F_CONSOLE:
1106		if (flags & IGN_CONS) {
1107			dprintf(" (ignored)\n");
1108			break;
1109		}
1110		/* FALLTHROUGH */
1111
1112	case F_TTY:
1113		dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1114		v->iov_base = "\r\n";
1115		v->iov_len = 2;
1116
1117		errno = 0;	/* ttymsg() only sometimes returns an errno */
1118		if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) {
1119			f->f_type = F_UNUSED;
1120			logerror(msgret);
1121		}
1122		break;
1123
1124	case F_USERS:
1125	case F_WALL:
1126		dprintf("\n");
1127		v->iov_base = "\r\n";
1128		v->iov_len = 2;
1129		wallmsg(f, iov);
1130		break;
1131	}
1132	f->f_prevcount = 0;
1133	if (msg)
1134		free(wmsg);
1135}
1136
1137/*
1138 *  WALLMSG -- Write a message to the world at large
1139 *
1140 *	Write the specified message to either the entire
1141 *	world, or a list of approved users.
1142 */
1143void
1144wallmsg(f, iov)
1145	struct filed *f;
1146	struct iovec *iov;
1147{
1148	static int reenter;			/* avoid calling ourselves */
1149	FILE *uf;
1150	struct utmp ut;
1151	int i;
1152	const char *p;
1153	char line[sizeof(ut.ut_line) + 1];
1154
1155	if (reenter++)
1156		return;
1157	if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1158		logerror(_PATH_UTMP);
1159		reenter = 0;
1160		return;
1161	}
1162	/* NOSTRICT */
1163	while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1164		if (ut.ut_name[0] == '\0')
1165			continue;
1166		(void)strlcpy(line, ut.ut_line, sizeof(line));
1167		if (f->f_type == F_WALL) {
1168			if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) {
1169				errno = 0;	/* already in msg */
1170				logerror(p);
1171			}
1172			continue;
1173		}
1174		/* should we send the message to this user? */
1175		for (i = 0; i < MAXUNAMES; i++) {
1176			if (!f->f_un.f_uname[i][0])
1177				break;
1178			if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1179			    UT_NAMESIZE)) {
1180				if ((p = ttymsg(iov, 7, line, TTYMSGTIME))
1181								!= NULL) {
1182					errno = 0;	/* already in msg */
1183					logerror(p);
1184				}
1185				break;
1186			}
1187		}
1188	}
1189	(void)fclose(uf);
1190	reenter = 0;
1191}
1192
1193void
1194reapchild(signo)
1195	int signo __unused;
1196{
1197	int status;
1198	pid_t pid;
1199	struct filed *f;
1200
1201	while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1202		if (!Initialized)
1203			/* Don't tell while we are initting. */
1204			continue;
1205
1206		/* First, look if it's a process from the dead queue. */
1207		if (deadq_remove(pid))
1208			goto oncemore;
1209
1210		/* Now, look in list of active processes. */
1211		for (f = Files; f; f = f->f_next)
1212			if (f->f_type == F_PIPE &&
1213			    f->f_un.f_pipe.f_pid == pid) {
1214				(void)close(f->f_file);
1215				f->f_un.f_pipe.f_pid = 0;
1216				log_deadchild(pid, status,
1217					      f->f_un.f_pipe.f_pname);
1218				break;
1219			}
1220	  oncemore:
1221		continue;
1222	}
1223}
1224
1225/*
1226 * Return a printable representation of a host address.
1227 */
1228const char *
1229cvthname(f)
1230	struct sockaddr *f;
1231{
1232	int error;
1233	sigset_t omask, nmask;
1234	char *p;
1235	static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1236
1237	error = getnameinfo((struct sockaddr *)f,
1238			    ((struct sockaddr *)f)->sa_len,
1239			    ip, sizeof ip, NULL, 0,
1240			    NI_NUMERICHOST | withscopeid);
1241	dprintf("cvthname(%s)\n", ip);
1242
1243	if (error) {
1244		dprintf("Malformed from address %s\n", gai_strerror(error));
1245		return ("???");
1246	}
1247	if (!resolve)
1248		return (ip);
1249
1250	sigemptyset(&nmask);
1251	sigaddset(&nmask, SIGHUP);
1252	sigprocmask(SIG_BLOCK, &nmask, &omask);
1253	error = getnameinfo((struct sockaddr *)f,
1254			    ((struct sockaddr *)f)->sa_len,
1255			    hname, sizeof hname, NULL, 0,
1256			    NI_NAMEREQD | withscopeid);
1257	sigprocmask(SIG_SETMASK, &omask, NULL);
1258	if (error) {
1259		dprintf("Host name for your address (%s) unknown\n", ip);
1260		return (ip);
1261	}
1262	/* XXX Not quite correct, but close enough for government work. */
1263	if ((p = strchr(hname, '.')) && strcasecmp(p + 1, LocalDomain) == 0)
1264		*p = '\0';
1265	return (hname);
1266}
1267
1268void
1269dodie(signo)
1270	int signo;
1271{
1272
1273	WantDie = signo;
1274}
1275
1276void
1277domark(signo)
1278	int signo __unused;
1279{
1280
1281	MarkSet = 1;
1282}
1283
1284/*
1285 * Print syslogd errors some place.
1286 */
1287void
1288logerror(type)
1289	const char *type;
1290{
1291	char buf[512];
1292
1293	if (errno)
1294		(void)snprintf(buf,
1295		    sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1296	else
1297		(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1298	errno = 0;
1299	dprintf("%s\n", buf);
1300	logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1301}
1302
1303void
1304die(signo)
1305	int signo;
1306{
1307	struct filed *f;
1308	int was_initialized;
1309	char buf[100];
1310	int i;
1311
1312	was_initialized = Initialized;
1313	Initialized = 0;	/* Don't log SIGCHLDs. */
1314	for (f = Files; f != NULL; f = f->f_next) {
1315		/* flush any pending output */
1316		if (f->f_prevcount)
1317			fprintlog(f, 0, (char *)NULL);
1318		if (f->f_type == F_PIPE)
1319			(void)close(f->f_file);
1320	}
1321	Initialized = was_initialized;
1322	if (signo) {
1323		dprintf("syslogd: exiting on signal %d\n", signo);
1324		(void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1325		errno = 0;
1326		logerror(buf);
1327	}
1328	for (i = 0; i < nfunix; i++)
1329		if (funixn[i] && funix[i] != -1)
1330			(void)unlink(funixn[i]);
1331	exit(1);
1332}
1333
1334/*
1335 *  INIT -- Initialize syslogd from configuration table
1336 */
1337void
1338init(signo)
1339	int signo;
1340{
1341	int i;
1342	FILE *cf;
1343	struct filed *f, *next, **nextp;
1344	char *p;
1345	char cline[LINE_MAX];
1346 	char prog[NAME_MAX+1];
1347	char host[MAXHOSTNAMELEN];
1348	char oldLocalHostName[MAXHOSTNAMELEN];
1349	char hostMsg[2*MAXHOSTNAMELEN+40];
1350	char bootfileMsg[LINE_MAX];
1351
1352	dprintf("init\n");
1353
1354	/*
1355	 * Load hostname (may have changed).
1356	 */
1357	if (signo != 0)
1358		(void)strlcpy(oldLocalHostName, LocalHostName,
1359		    sizeof(oldLocalHostName));
1360	if (gethostname(LocalHostName, sizeof(LocalHostName)))
1361		err(EX_OSERR, "gethostname() failed");
1362	if ((p = strchr(LocalHostName, '.')) != NULL) {
1363		*p++ = '\0';
1364		LocalDomain = p;
1365	} else
1366		LocalDomain = "";
1367
1368	/*
1369	 *  Close all open log files.
1370	 */
1371	Initialized = 0;
1372	for (f = Files; f != NULL; f = next) {
1373		/* flush any pending output */
1374		if (f->f_prevcount)
1375			fprintlog(f, 0, (char *)NULL);
1376
1377		switch (f->f_type) {
1378		case F_FILE:
1379		case F_FORW:
1380		case F_CONSOLE:
1381		case F_TTY:
1382			(void)close(f->f_file);
1383			break;
1384		case F_PIPE:
1385			(void)close(f->f_file);
1386			if (f->f_un.f_pipe.f_pid > 0)
1387				deadq_enter(f->f_un.f_pipe.f_pid,
1388					    f->f_un.f_pipe.f_pname);
1389			f->f_un.f_pipe.f_pid = 0;
1390			break;
1391		}
1392		next = f->f_next;
1393		if (f->f_program) free(f->f_program);
1394		if (f->f_host) free(f->f_host);
1395		free((char *)f);
1396	}
1397	Files = NULL;
1398	nextp = &Files;
1399
1400	/* open the configuration file */
1401	if ((cf = fopen(ConfFile, "r")) == NULL) {
1402		dprintf("cannot open %s\n", ConfFile);
1403		*nextp = (struct filed *)calloc(1, sizeof(*f));
1404		if (*nextp == NULL) {
1405			logerror("calloc");
1406			exit(1);
1407		}
1408		cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1409		(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1410		if ((*nextp)->f_next == NULL) {
1411			logerror("calloc");
1412			exit(1);
1413		}
1414		cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1415		Initialized = 1;
1416		return;
1417	}
1418
1419	/*
1420	 *  Foreach line in the conf table, open that file.
1421	 */
1422	f = NULL;
1423	(void)strlcpy(host, "*", sizeof(host));
1424	(void)strlcpy(prog, "*", sizeof(prog));
1425	while (fgets(cline, sizeof(cline), cf) != NULL) {
1426		/*
1427		 * check for end-of-section, comments, strip off trailing
1428		 * spaces and newline character. #!prog is treated specially:
1429		 * following lines apply only to that program.
1430		 */
1431		for (p = cline; isspace(*p); ++p)
1432			continue;
1433		if (*p == 0)
1434			continue;
1435		if (*p == '#') {
1436			p++;
1437			if (*p != '!' && *p != '+' && *p != '-')
1438				continue;
1439		}
1440		if (*p == '+' || *p == '-') {
1441			host[0] = *p++;
1442			while (isspace(*p))
1443				p++;
1444			if ((!*p) || (*p == '*')) {
1445				(void)strlcpy(host, "*", sizeof(host));
1446				continue;
1447			}
1448			if (*p == '@')
1449				p = LocalHostName;
1450			for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1451				if (!isalnum(*p) && *p != '.' && *p != '-')
1452					break;
1453				host[i] = *p++;
1454			}
1455			host[i] = '\0';
1456			continue;
1457		}
1458		if (*p == '!') {
1459			p++;
1460			while (isspace(*p)) p++;
1461			if ((!*p) || (*p == '*')) {
1462				(void)strlcpy(prog, "*", sizeof(prog));
1463				continue;
1464			}
1465			for (i = 0; i < NAME_MAX; i++) {
1466				if (!isalnum(p[i]))
1467					break;
1468				prog[i] = p[i];
1469			}
1470			prog[i] = 0;
1471			continue;
1472		}
1473		for (p = strchr(cline, '\0'); isspace(*--p);)
1474			continue;
1475		*++p = '\0';
1476		f = (struct filed *)calloc(1, sizeof(*f));
1477		if (f == NULL) {
1478			logerror("calloc");
1479			exit(1);
1480		}
1481		*nextp = f;
1482		nextp = &f->f_next;
1483		cfline(cline, f, prog, host);
1484	}
1485
1486	/* close the configuration file */
1487	(void)fclose(cf);
1488
1489	Initialized = 1;
1490
1491	if (Debug) {
1492		for (f = Files; f; f = f->f_next) {
1493			for (i = 0; i <= LOG_NFACILITIES; i++)
1494				if (f->f_pmask[i] == INTERNAL_NOPRI)
1495					printf("X ");
1496				else
1497					printf("%d ", f->f_pmask[i]);
1498			printf("%s: ", TypeNames[f->f_type]);
1499			switch (f->f_type) {
1500			case F_FILE:
1501				printf("%s", f->f_un.f_fname);
1502				break;
1503
1504			case F_CONSOLE:
1505			case F_TTY:
1506				printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1507				break;
1508
1509			case F_FORW:
1510				printf("%s", f->f_un.f_forw.f_hname);
1511				break;
1512
1513			case F_PIPE:
1514				printf("%s", f->f_un.f_pipe.f_pname);
1515				break;
1516
1517			case F_USERS:
1518				for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1519					printf("%s, ", f->f_un.f_uname[i]);
1520				break;
1521			}
1522			if (f->f_program)
1523				printf(" (%s)", f->f_program);
1524			printf("\n");
1525		}
1526	}
1527
1528	logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1529	dprintf("syslogd: restarted\n");
1530	/*
1531	 * Log a change in hostname, but only on a restart.
1532	 */
1533	if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1534		(void)snprintf(hostMsg, sizeof(hostMsg),
1535		    "syslogd: hostname changed, \"%s\" to \"%s\"",
1536		    oldLocalHostName, LocalHostName);
1537		logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1538		dprintf("%s\n", hostMsg);
1539	}
1540	/*
1541	 * Log the kernel boot file if we aren't going to use it as
1542	 * the prefix, and if this is *not* a restart.
1543	 */
1544	if (signo == 0 && !use_bootfile) {
1545		(void)snprintf(bootfileMsg, sizeof(bootfileMsg),
1546		    "syslogd: kernel boot file is %s", bootfile);
1547		logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1548		dprintf("%s\n", bootfileMsg);
1549	}
1550}
1551
1552/*
1553 * Crack a configuration file line
1554 */
1555void
1556cfline(line, f, prog, host)
1557	const char *line;
1558	struct filed *f;
1559	const char *prog;
1560	const char *host;
1561{
1562	struct addrinfo hints, *res;
1563	int error, i, pri;
1564	const char *p, *q;
1565	char *bp;
1566	char buf[MAXLINE], ebuf[100];
1567
1568	dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1569
1570	errno = 0;	/* keep strerror() stuff out of logerror messages */
1571
1572	/* clear out file entry */
1573	memset(f, 0, sizeof(*f));
1574	for (i = 0; i <= LOG_NFACILITIES; i++)
1575		f->f_pmask[i] = INTERNAL_NOPRI;
1576
1577	/* save hostname if any */
1578	if (host && *host == '*')
1579		host = NULL;
1580	if (host) {
1581		int hl, dl;
1582
1583		f->f_host = strdup(host);
1584		if (f->f_host == NULL) {
1585			logerror("strdup");
1586			exit(1);
1587		}
1588		hl = strlen(f->f_host);
1589		if (f->f_host[hl-1] == '.')
1590			f->f_host[--hl] = '\0';
1591		dl = strlen(LocalDomain) + 1;
1592		if (hl > dl && f->f_host[hl-dl] == '.' &&
1593		    strcasecmp(f->f_host + hl - dl + 1, LocalDomain) == 0)
1594			f->f_host[hl-dl] = '\0';
1595	}
1596
1597	/* save program name if any */
1598	if (prog && *prog == '*')
1599		prog = NULL;
1600	if (prog) {
1601		f->f_program = strdup(prog);
1602		if (f->f_program == NULL) {
1603			logerror("strdup");
1604			exit(1);
1605		}
1606	}
1607
1608	/* scan through the list of selectors */
1609	for (p = line; *p && *p != '\t' && *p != ' ';) {
1610		int pri_done;
1611		int pri_cmp;
1612
1613		/* find the end of this facility name list */
1614		for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1615			continue;
1616
1617		/* get the priority comparison */
1618		pri_cmp = 0;
1619		pri_done = 0;
1620		while (!pri_done) {
1621			switch (*q) {
1622			case '<':
1623				pri_cmp |= PRI_LT;
1624				q++;
1625				break;
1626			case '=':
1627				pri_cmp |= PRI_EQ;
1628				q++;
1629				break;
1630			case '>':
1631				pri_cmp |= PRI_GT;
1632				q++;
1633				break;
1634			default:
1635				pri_done++;
1636				break;
1637			}
1638		}
1639		if (!pri_cmp)
1640			pri_cmp = (UniquePriority)
1641				  ? (PRI_EQ)
1642				  : (PRI_EQ | PRI_GT)
1643				  ;
1644
1645		/* collect priority name */
1646		for (bp = buf; *q && !strchr("\t,; ", *q); )
1647			*bp++ = *q++;
1648		*bp = '\0';
1649
1650		/* skip cruft */
1651		while (strchr(",;", *q))
1652			q++;
1653
1654		/* decode priority name */
1655		if (*buf == '*')
1656			pri = LOG_PRIMASK + 1;
1657		else {
1658			pri = decode(buf, prioritynames);
1659			if (pri < 0) {
1660				(void)snprintf(ebuf, sizeof ebuf,
1661				    "unknown priority name \"%s\"", buf);
1662				logerror(ebuf);
1663				return;
1664			}
1665		}
1666
1667		/* scan facilities */
1668		while (*p && !strchr("\t.; ", *p)) {
1669			for (bp = buf; *p && !strchr("\t,;. ", *p); )
1670				*bp++ = *p++;
1671			*bp = '\0';
1672
1673			if (*buf == '*')
1674				for (i = 0; i < LOG_NFACILITIES; i++) {
1675					f->f_pmask[i] = pri;
1676					f->f_pcmp[i] = pri_cmp;
1677				}
1678			else {
1679				i = decode(buf, facilitynames);
1680				if (i < 0) {
1681					(void)snprintf(ebuf, sizeof ebuf,
1682					    "unknown facility name \"%s\"",
1683					    buf);
1684					logerror(ebuf);
1685					return;
1686				}
1687				f->f_pmask[i >> 3] = pri;
1688				f->f_pcmp[i >> 3] = pri_cmp;
1689			}
1690			while (*p == ',' || *p == ' ')
1691				p++;
1692		}
1693
1694		p = q;
1695	}
1696
1697	/* skip to action part */
1698	while (*p == '\t' || *p == ' ')
1699		p++;
1700
1701	switch (*p)
1702	{
1703	case '@':
1704		(void)strlcpy(f->f_un.f_forw.f_hname, ++p,
1705			sizeof(f->f_un.f_forw.f_hname));
1706		memset(&hints, 0, sizeof(hints));
1707		hints.ai_family = family;
1708		hints.ai_socktype = SOCK_DGRAM;
1709		error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints,
1710				    &res);
1711		if (error) {
1712			logerror(gai_strerror(error));
1713			break;
1714		}
1715		f->f_un.f_forw.f_addr = res;
1716		f->f_type = F_FORW;
1717		break;
1718
1719	case '/':
1720		if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
1721			f->f_type = F_UNUSED;
1722			logerror(p);
1723			break;
1724		}
1725		if (isatty(f->f_file)) {
1726			if (strcmp(p, ctty) == 0)
1727				f->f_type = F_CONSOLE;
1728			else
1729				f->f_type = F_TTY;
1730			(void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
1731			    sizeof(f->f_un.f_fname));
1732		} else {
1733			(void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
1734			f->f_type = F_FILE;
1735		}
1736		break;
1737
1738	case '|':
1739		f->f_un.f_pipe.f_pid = 0;
1740		(void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname));
1741		f->f_type = F_PIPE;
1742		break;
1743
1744	case '*':
1745		f->f_type = F_WALL;
1746		break;
1747
1748	default:
1749		for (i = 0; i < MAXUNAMES && *p; i++) {
1750			for (q = p; *q && *q != ','; )
1751				q++;
1752			(void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
1753			if ((q - p) > UT_NAMESIZE)
1754				f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
1755			else
1756				f->f_un.f_uname[i][q - p] = '\0';
1757			while (*q == ',' || *q == ' ')
1758				q++;
1759			p = q;
1760		}
1761		f->f_type = F_USERS;
1762		break;
1763	}
1764}
1765
1766
1767/*
1768 *  Decode a symbolic name to a numeric value
1769 */
1770int
1771decode(name, codetab)
1772	const char *name;
1773	CODE *codetab;
1774{
1775	CODE *c;
1776	char *p, buf[40];
1777
1778	if (isdigit(*name))
1779		return (atoi(name));
1780
1781	for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
1782		if (isupper(*name))
1783			*p = tolower(*name);
1784		else
1785			*p = *name;
1786	}
1787	*p = '\0';
1788	for (c = codetab; c->c_name; c++)
1789		if (!strcmp(buf, c->c_name))
1790			return (c->c_val);
1791
1792	return (-1);
1793}
1794
1795void
1796markit(void)
1797{
1798	struct filed *f;
1799	dq_t q;
1800
1801	now = time((time_t *)NULL);
1802	MarkSeq += TIMERINTVL;
1803	if (MarkSeq >= MarkInterval) {
1804		logmsg(LOG_INFO, "-- MARK --",
1805		    LocalHostName, ADDDATE|MARK);
1806		MarkSeq = 0;
1807	}
1808
1809	for (f = Files; f; f = f->f_next) {
1810		if (f->f_prevcount && now >= REPEATTIME(f)) {
1811			dprintf("flush %s: repeated %d times, %d sec.\n",
1812			    TypeNames[f->f_type], f->f_prevcount,
1813			    repeatinterval[f->f_repeatcount]);
1814			fprintlog(f, 0, (char *)NULL);
1815			BACKOFF(f);
1816		}
1817	}
1818
1819	/* Walk the dead queue, and see if we should signal somebody. */
1820	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
1821		switch (q->dq_timeout) {
1822		case 0:
1823			/* Already signalled once, try harder now. */
1824			if (kill(q->dq_pid, SIGKILL) != 0)
1825				(void)deadq_remove(q->dq_pid);
1826			break;
1827
1828		case 1:
1829			/*
1830			 * Timed out on dead queue, send terminate
1831			 * signal.  Note that we leave the removal
1832			 * from the dead queue to reapchild(), which
1833			 * will also log the event (unless the process
1834			 * didn't even really exist, in case we simply
1835			 * drop it from the dead queue).
1836			 */
1837			if (kill(q->dq_pid, SIGTERM) != 0)
1838				(void)deadq_remove(q->dq_pid);
1839			/* FALLTHROUGH */
1840
1841		default:
1842			q->dq_timeout--;
1843		}
1844	MarkSet = 0;
1845	(void)alarm(TIMERINTVL);
1846}
1847
1848/*
1849 * fork off and become a daemon, but wait for the child to come online
1850 * before returing to the parent, or we get disk thrashing at boot etc.
1851 * Set a timer so we don't hang forever if it wedges.
1852 */
1853int
1854waitdaemon(nochdir, noclose, maxwait)
1855	int nochdir, noclose, maxwait;
1856{
1857	int fd;
1858	int status;
1859	pid_t pid, childpid;
1860
1861	switch (childpid = fork()) {
1862	case -1:
1863		return (-1);
1864	case 0:
1865		break;
1866	default:
1867		signal(SIGALRM, timedout);
1868		alarm(maxwait);
1869		while ((pid = wait3(&status, 0, NULL)) != -1) {
1870			if (WIFEXITED(status))
1871				errx(1, "child pid %d exited with return code %d",
1872					pid, WEXITSTATUS(status));
1873			if (WIFSIGNALED(status))
1874				errx(1, "child pid %d exited on signal %d%s",
1875					pid, WTERMSIG(status),
1876					WCOREDUMP(status) ? " (core dumped)" :
1877					"");
1878			if (pid == childpid)	/* it's gone... */
1879				break;
1880		}
1881		exit(0);
1882	}
1883
1884	if (setsid() == -1)
1885		return (-1);
1886
1887	if (!nochdir)
1888		(void)chdir("/");
1889
1890	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1891		(void)dup2(fd, STDIN_FILENO);
1892		(void)dup2(fd, STDOUT_FILENO);
1893		(void)dup2(fd, STDERR_FILENO);
1894		if (fd > 2)
1895			(void)close (fd);
1896	}
1897	return (getppid());
1898}
1899
1900/*
1901 * We get a SIGALRM from the child when it's running and finished doing it's
1902 * fsync()'s or O_SYNC writes for all the boot messages.
1903 *
1904 * We also get a signal from the kernel if the timer expires, so check to
1905 * see what happened.
1906 */
1907void
1908timedout(sig)
1909	int sig __unused;
1910{
1911	int left;
1912	left = alarm(0);
1913	signal(SIGALRM, SIG_DFL);
1914	if (left == 0)
1915		errx(1, "timed out waiting for child");
1916	else
1917		_exit(0);
1918}
1919
1920/*
1921 * Add `s' to the list of allowable peer addresses to accept messages
1922 * from.
1923 *
1924 * `s' is a string in the form:
1925 *
1926 *    [*]domainname[:{servicename|portnumber|*}]
1927 *
1928 * or
1929 *
1930 *    netaddr/maskbits[:{servicename|portnumber|*}]
1931 *
1932 * Returns -1 on error, 0 if the argument was valid.
1933 */
1934int
1935allowaddr(s)
1936	char *s;
1937{
1938	char *cp1, *cp2;
1939	struct allowedpeer ap;
1940	struct servent *se;
1941	int masklen = -1, i;
1942	struct addrinfo hints, *res;
1943	struct in_addr *addrp, *maskp;
1944	u_int32_t *addr6p, *mask6p;
1945	char ip[NI_MAXHOST];
1946
1947#ifdef INET6
1948	if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
1949#endif
1950		cp1 = s;
1951	if ((cp1 = strrchr(cp1, ':'))) {
1952		/* service/port provided */
1953		*cp1++ = '\0';
1954		if (strlen(cp1) == 1 && *cp1 == '*')
1955			/* any port allowed */
1956			ap.port = 0;
1957		else if ((se = getservbyname(cp1, "udp")))
1958			ap.port = ntohs(se->s_port);
1959		else {
1960			ap.port = strtol(cp1, &cp2, 0);
1961			if (*cp2 != '\0')
1962				return -1; /* port not numeric */
1963		}
1964	} else {
1965		if ((se = getservbyname("syslog", "udp")))
1966			ap.port = ntohs(se->s_port);
1967		else
1968			/* sanity, should not happen */
1969			ap.port = 514;
1970	}
1971
1972	if ((cp1 = strchr(s, '/')) != NULL &&
1973	    strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
1974		*cp1 = '\0';
1975		if ((masklen = atoi(cp1 + 1)) < 0)
1976			return -1;
1977	}
1978#ifdef INET6
1979	if (*s == '[') {
1980		cp2 = s + strlen(s) - 1;
1981		if (*cp2 == ']') {
1982			++s;
1983			*cp2 = '\0';
1984		} else
1985			cp2 = NULL;
1986	} else
1987		cp2 = NULL;
1988#endif
1989	memset(&hints, 0, sizeof(hints));
1990	hints.ai_family = PF_UNSPEC;
1991	hints.ai_socktype = SOCK_DGRAM;
1992	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
1993	if (getaddrinfo(s, NULL, &hints, &res) == 0) {
1994		ap.isnumeric = 1;
1995		memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
1996		memset(&ap.a_mask, 0, sizeof(ap.a_mask));
1997		ap.a_mask.ss_family = res->ai_family;
1998		if (res->ai_family == AF_INET) {
1999			ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2000			maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2001			addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2002			if (masklen < 0) {
2003				/* use default netmask */
2004				if (IN_CLASSA(ntohl(addrp->s_addr)))
2005					maskp->s_addr = htonl(IN_CLASSA_NET);
2006				else if (IN_CLASSB(ntohl(addrp->s_addr)))
2007					maskp->s_addr = htonl(IN_CLASSB_NET);
2008				else
2009					maskp->s_addr = htonl(IN_CLASSC_NET);
2010			} else if (masklen <= 32) {
2011				/* convert masklen to netmask */
2012				if (masklen == 0)
2013					maskp->s_addr = 0;
2014				else
2015					maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2016			} else {
2017				freeaddrinfo(res);
2018				return -1;
2019			}
2020			/* Lose any host bits in the network number. */
2021			addrp->s_addr &= maskp->s_addr;
2022		}
2023#ifdef INET6
2024		else if (res->ai_family == AF_INET6 && masklen <= 128) {
2025			ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2026			if (masklen < 0)
2027				masklen = 128;
2028			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2029			/* convert masklen to netmask */
2030			while (masklen > 0) {
2031				if (masklen < 32) {
2032					*mask6p = htonl(~(0xffffffff >> masklen));
2033					break;
2034				}
2035				*mask6p++ = 0xffffffff;
2036				masklen -= 32;
2037			}
2038			/* Lose any host bits in the network number. */
2039			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2040			addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2041			for (i = 0; i < 4; i++)
2042				addr6p[i] &= mask6p[i];
2043		}
2044#endif
2045		else {
2046			freeaddrinfo(res);
2047			return -1;
2048		}
2049		freeaddrinfo(res);
2050	} else {
2051		/* arg `s' is domain name */
2052		ap.isnumeric = 0;
2053		ap.a_name = s;
2054		if (cp1)
2055			*cp1 = '/';
2056#ifdef INET6
2057		if (cp2) {
2058			*cp2 = ']';
2059			--s;
2060		}
2061#endif
2062	}
2063
2064	if (Debug) {
2065		printf("allowaddr: rule %d: ", NumAllowed);
2066		if (ap.isnumeric) {
2067			printf("numeric, ");
2068			getnameinfo((struct sockaddr *)&ap.a_addr,
2069				    ((struct sockaddr *)&ap.a_addr)->sa_len,
2070				    ip, sizeof ip, NULL, 0,
2071				    NI_NUMERICHOST | withscopeid);
2072			printf("addr = %s, ", ip);
2073			getnameinfo((struct sockaddr *)&ap.a_mask,
2074				    ((struct sockaddr *)&ap.a_mask)->sa_len,
2075				    ip, sizeof ip, NULL, 0,
2076				    NI_NUMERICHOST | withscopeid);
2077			printf("mask = %s; ", ip);
2078		} else
2079			printf("domainname = %s; ", ap.a_name);
2080		printf("port = %d\n", ap.port);
2081	}
2082
2083	if ((AllowedPeers = realloc(AllowedPeers,
2084				    ++NumAllowed * sizeof(struct allowedpeer)))
2085	    == NULL) {
2086		logerror("realloc");
2087		exit(1);
2088	}
2089	memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2090	return 0;
2091}
2092
2093/*
2094 * Validate that the remote peer has permission to log to us.
2095 */
2096int
2097validate(sa, hname)
2098	struct sockaddr *sa;
2099	const char *hname;
2100{
2101	int i, j, reject;
2102	size_t l1, l2;
2103	char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2104	struct allowedpeer *ap;
2105	struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2106	struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2107	struct addrinfo hints, *res;
2108	u_short sport;
2109
2110	if (NumAllowed == 0)
2111		/* traditional behaviour, allow everything */
2112		return 1;
2113
2114	(void)strlcpy(name, hname, sizeof(name));
2115	memset(&hints, 0, sizeof(hints));
2116	hints.ai_family = PF_UNSPEC;
2117	hints.ai_socktype = SOCK_DGRAM;
2118	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2119	if (getaddrinfo(name, NULL, &hints, &res) == 0)
2120		freeaddrinfo(res);
2121	else if (strchr(name, '.') == NULL) {
2122		strlcat(name, ".", sizeof name);
2123		strlcat(name, LocalDomain, sizeof name);
2124	}
2125	if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2126			NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0)
2127		return 0;	/* for safety, should not occur */
2128	dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2129		ip, port, name);
2130	sport = atoi(port);
2131
2132	/* now, walk down the list */
2133	for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2134		if (ap->port != 0 && ap->port != sport) {
2135			dprintf("rejected in rule %d due to port mismatch.\n", i);
2136			continue;
2137		}
2138
2139		if (ap->isnumeric) {
2140			if (ap->a_addr.ss_family != sa->sa_family) {
2141				dprintf("rejected in rule %d due to address family mismatch.\n", i);
2142				continue;
2143			}
2144			if (ap->a_addr.ss_family == AF_INET) {
2145				sin4 = (struct sockaddr_in *)sa;
2146				a4p = (struct sockaddr_in *)&ap->a_addr;
2147				m4p = (struct sockaddr_in *)&ap->a_mask;
2148				if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2149				    != a4p->sin_addr.s_addr) {
2150					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2151					continue;
2152				}
2153			}
2154#ifdef INET6
2155			else if (ap->a_addr.ss_family == AF_INET6) {
2156				sin6 = (struct sockaddr_in6 *)sa;
2157				a6p = (struct sockaddr_in6 *)&ap->a_addr;
2158				m6p = (struct sockaddr_in6 *)&ap->a_mask;
2159#ifdef NI_WITHSCOPEID
2160				if (a6p->sin6_scope_id != 0 &&
2161				    sin6->sin6_scope_id != a6p->sin6_scope_id) {
2162					dprintf("rejected in rule %d due to scope mismatch.\n", i);
2163					continue;
2164				}
2165#endif
2166				reject = 0;
2167				for (j = 0; j < 16; j += 4) {
2168					if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2169					    != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2170						++reject;
2171						break;
2172					}
2173				}
2174				if (reject) {
2175					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2176					continue;
2177				}
2178			}
2179#endif
2180			else
2181				continue;
2182		} else {
2183			cp = ap->a_name;
2184			l1 = strlen(name);
2185			if (*cp == '*') {
2186				/* allow wildmatch */
2187				cp++;
2188				l2 = strlen(cp);
2189				if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2190					dprintf("rejected in rule %d due to name mismatch.\n", i);
2191					continue;
2192				}
2193			} else {
2194				/* exact match */
2195				l2 = strlen(cp);
2196				if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2197					dprintf("rejected in rule %d due to name mismatch.\n", i);
2198					continue;
2199				}
2200			}
2201		}
2202		dprintf("accepted in rule %d.\n", i);
2203		return 1;	/* hooray! */
2204	}
2205	return 0;
2206}
2207
2208/*
2209 * Fairly similar to popen(3), but returns an open descriptor, as
2210 * opposed to a FILE *.
2211 */
2212int
2213p_open(prog, pid)
2214	const char *prog;
2215	pid_t *pid;
2216{
2217	int pfd[2], nulldesc, i;
2218	sigset_t omask, mask;
2219	char *argv[4]; /* sh -c cmd NULL */
2220	char errmsg[200];
2221
2222	if (pipe(pfd) == -1)
2223		return -1;
2224	if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2225		/* we are royally screwed anyway */
2226		return -1;
2227
2228	sigemptyset(&mask);
2229	sigaddset(&mask, SIGALRM);
2230	sigaddset(&mask, SIGHUP);
2231	sigprocmask(SIG_BLOCK, &mask, &omask);
2232	switch ((*pid = fork())) {
2233	case -1:
2234		sigprocmask(SIG_SETMASK, &omask, 0);
2235		close(nulldesc);
2236		return -1;
2237
2238	case 0:
2239		/* XXX should check for NULL return */
2240		argv[0] = strdup("sh");
2241		argv[1] = strdup("-c");
2242		argv[2] = strdup(prog);
2243		argv[3] = NULL;
2244		if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2245			logerror("strdup");
2246			exit(1);
2247		}
2248
2249		alarm(0);
2250		(void)setsid();	/* Avoid catching SIGHUPs. */
2251
2252		/*
2253		 * Throw away pending signals, and reset signal
2254		 * behaviour to standard values.
2255		 */
2256		signal(SIGALRM, SIG_IGN);
2257		signal(SIGHUP, SIG_IGN);
2258		sigprocmask(SIG_SETMASK, &omask, 0);
2259		signal(SIGPIPE, SIG_DFL);
2260		signal(SIGQUIT, SIG_DFL);
2261		signal(SIGALRM, SIG_DFL);
2262		signal(SIGHUP, SIG_DFL);
2263
2264		dup2(pfd[0], STDIN_FILENO);
2265		dup2(nulldesc, STDOUT_FILENO);
2266		dup2(nulldesc, STDERR_FILENO);
2267		for (i = getdtablesize(); i > 2; i--)
2268			(void) close(i);
2269
2270		(void) execvp(_PATH_BSHELL, argv);
2271		_exit(255);
2272	}
2273
2274	sigprocmask(SIG_SETMASK, &omask, 0);
2275	close(nulldesc);
2276	close(pfd[0]);
2277	/*
2278	 * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
2279	 * supposed to get an EWOULDBLOCK on writev(2), which is
2280	 * caught by the logic above anyway, which will in turn close
2281	 * the pipe, and fork a new logging subprocess if necessary.
2282	 * The stale subprocess will be killed some time later unless
2283	 * it terminated itself due to closing its input pipe (so we
2284	 * get rid of really dead puppies).
2285	 */
2286	if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2287		/* This is bad. */
2288		(void)snprintf(errmsg, sizeof errmsg,
2289			       "Warning: cannot change pipe to PID %d to "
2290			       "non-blocking behaviour.",
2291			       (int)*pid);
2292		logerror(errmsg);
2293	}
2294	return pfd[1];
2295}
2296
2297void
2298deadq_enter(pid, name)
2299	pid_t pid;
2300	const char *name;
2301{
2302	dq_t p;
2303	int status;
2304
2305	/*
2306	 * Be paranoid, if we can't signal the process, don't enter it
2307	 * into the dead queue (perhaps it's already dead).  If possible,
2308	 * we try to fetch and log the child's status.
2309	 */
2310	if (kill(pid, 0) != 0) {
2311		if (waitpid(pid, &status, WNOHANG) > 0)
2312			log_deadchild(pid, status, name);
2313		return;
2314	}
2315
2316	p = malloc(sizeof(struct deadq_entry));
2317	if (p == NULL) {
2318		logerror("malloc");
2319		exit(1);
2320	}
2321
2322	p->dq_pid = pid;
2323	p->dq_timeout = DQ_TIMO_INIT;
2324	TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2325}
2326
2327int
2328deadq_remove(pid)
2329	pid_t pid;
2330{
2331	dq_t q;
2332
2333	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
2334		if (q->dq_pid == pid) {
2335			TAILQ_REMOVE(&deadq_head, q, dq_entries);
2336				free(q);
2337				return 1;
2338		}
2339
2340	return 0;
2341}
2342
2343void
2344log_deadchild(pid, status, name)
2345	pid_t pid;
2346	int status;
2347	const char *name;
2348{
2349	int code;
2350	char buf[256];
2351	const char *reason;
2352
2353	errno = 0; /* Keep strerror() stuff out of logerror messages. */
2354	if (WIFSIGNALED(status)) {
2355		reason = "due to signal";
2356		code = WTERMSIG(status);
2357	} else {
2358		reason = "with status";
2359		code = WEXITSTATUS(status);
2360		if (code == 0)
2361			return;
2362	}
2363	(void)snprintf(buf, sizeof buf,
2364		       "Logging subprocess %d (%s) exited %s %d.",
2365		       pid, name, reason, code);
2366	logerror(buf);
2367}
2368
2369int *
2370socksetup(af, bindhostname)
2371	int af;
2372	const char *bindhostname;
2373{
2374	struct addrinfo hints, *res, *r;
2375	int error, maxs, *s, *socks;
2376
2377	memset(&hints, 0, sizeof(hints));
2378	hints.ai_flags = AI_PASSIVE;
2379	hints.ai_family = af;
2380	hints.ai_socktype = SOCK_DGRAM;
2381	error = getaddrinfo(bindhostname, "syslog", &hints, &res);
2382	if (error) {
2383		logerror(gai_strerror(error));
2384		errno = 0;
2385		die(0);
2386	}
2387
2388	/* Count max number of sockets we may open */
2389	for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2390	socks = malloc((maxs+1) * sizeof(int));
2391	if (socks == NULL) {
2392		logerror("couldn't allocate memory for sockets");
2393		die(0);
2394	}
2395
2396	*socks = 0;   /* num of sockets counter at start of array */
2397	s = socks + 1;
2398	for (r = res; r; r = r->ai_next) {
2399		*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2400		if (*s < 0) {
2401			logerror("socket");
2402			continue;
2403		}
2404#ifdef IPV6_BINDV6ONLY
2405		if (r->ai_family == AF_INET6) {
2406			int on = 1;
2407			if (setsockopt(*s, IPPROTO_IPV6, IPV6_BINDV6ONLY,
2408				       (char *)&on, sizeof (on)) < 0) {
2409				logerror("setsockopt");
2410				close(*s);
2411				continue;
2412			}
2413		}
2414#endif
2415		if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2416			close(*s);
2417			logerror("bind");
2418			continue;
2419		}
2420
2421		(*socks)++;
2422		s++;
2423	}
2424
2425	if (*socks == 0) {
2426		free(socks);
2427		if (Debug)
2428			return(NULL);
2429		else
2430			die(0);
2431	}
2432	if (res)
2433		freeaddrinfo(res);
2434
2435	return(socks);
2436}
2437