syslogd.c revision 83402 
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 83402 2001-09-13 09:40:35Z 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 <setjmp.h>
103#include <signal.h>
104#include <stdio.h>
105#include <stdlib.h>
106#include <string.h>
107#include <sysexits.h>
108#include <unistd.h>
109#include <utmp.h>
110
111#include "pathnames.h"
112#include "ttymsg.h"
113
114#define SYSLOG_NAMES
115#include <sys/syslog.h>
116
117#ifdef NI_WITHSCOPEID
118static const int withscopeid = NI_WITHSCOPEID;
119#else
120static const int withscopeid = 0;
121#endif
122
123const char	*ConfFile = _PATH_LOGCONF;
124const char	*PidFile = _PATH_LOGPID;
125const char	ctty[] = _PATH_CONSOLE;
126
127#define	dprintf		if (Debug) printf
128
129#define MAXUNAMES	20	/* maximum number of user names */
130
131#define MAXFUNIX       20
132
133int nfunix = 1;
134const char *funixn[MAXFUNIX] = { _PATH_LOG };
135int funix[MAXFUNIX];
136
137/*
138 * Flags to logmsg().
139 */
140
141#define IGN_CONS	0x001	/* don't print on console */
142#define SYNC_FILE	0x002	/* do fsync on file after printing */
143#define ADDDATE		0x004	/* add a date to the message */
144#define MARK		0x008	/* this message is a mark */
145#define ISKERNEL	0x010	/* kernel generated message */
146
147/*
148 * This structure represents the files that will have log
149 * copies printed.
150 */
151
152struct filed {
153	struct	filed *f_next;		/* next in linked list */
154	short	f_type;			/* entry type, see below */
155	short	f_file;			/* file descriptor */
156	time_t	f_time;			/* time this was last written */
157	char	*f_host;		/* host from which to recd. */
158	u_char	f_pmask[LOG_NFACILITIES+1];	/* priority mask */
159	u_char	f_pcmp[LOG_NFACILITIES+1];	/* compare priority */
160#define PRI_LT	0x1
161#define PRI_EQ	0x2
162#define PRI_GT	0x4
163	char	*f_program;		/* program this applies to */
164	union {
165		char	f_uname[MAXUNAMES][UT_NAMESIZE+1];
166		struct {
167			char	f_hname[MAXHOSTNAMELEN];
168			struct addrinfo *f_addr;
169
170		} f_forw;		/* forwarding address */
171		char	f_fname[MAXPATHLEN];
172		struct {
173			char	f_pname[MAXPATHLEN];
174			pid_t	f_pid;
175		} f_pipe;
176	} f_un;
177	char	f_prevline[MAXSVLINE];		/* last message logged */
178	char	f_lasttime[16];			/* time of last occurrence */
179	char	f_prevhost[MAXHOSTNAMELEN];	/* host from which recd. */
180	int	f_prevpri;			/* pri of f_prevline */
181	int	f_prevlen;			/* length of f_prevline */
182	int	f_prevcount;			/* repetition cnt of prevline */
183	u_int	f_repeatcount;			/* number of "repeated" msgs */
184};
185
186/*
187 * Queue of about-to-be dead processes we should watch out for.
188 */
189
190TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
191struct stailhead *deadq_headp;
192
193struct deadq_entry {
194	pid_t				dq_pid;
195	int				dq_timeout;
196	TAILQ_ENTRY(deadq_entry)	dq_entries;
197};
198
199/*
200 * The timeout to apply to processes waiting on the dead queue.  Unit
201 * of measure is `mark intervals', i.e. 20 minutes by default.
202 * Processes on the dead queue will be terminated after that time.
203 */
204
205#define DQ_TIMO_INIT	2
206
207typedef struct deadq_entry *dq_t;
208
209
210/*
211 * Struct to hold records of network addresses that are allowed to log
212 * to us.
213 */
214struct allowedpeer {
215	int isnumeric;
216	u_short port;
217	union {
218		struct {
219			struct sockaddr_storage addr;
220			struct sockaddr_storage mask;
221		} numeric;
222		char *name;
223	} u;
224#define a_addr u.numeric.addr
225#define a_mask u.numeric.mask
226#define a_name u.name
227};
228
229
230/*
231 * Intervals at which we flush out "message repeated" messages,
232 * in seconds after previous message is logged.  After each flush,
233 * we move to the next interval until we reach the largest.
234 */
235int	repeatinterval[] = { 30, 120, 600 };	/* # of secs before flush */
236#define	MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
237#define	REPEATTIME(f)	((f)->f_time + repeatinterval[(f)->f_repeatcount])
238#define	BACKOFF(f)	{ if (++(f)->f_repeatcount > MAXREPEAT) \
239				 (f)->f_repeatcount = MAXREPEAT; \
240			}
241
242/* values for f_type */
243#define F_UNUSED	0		/* unused entry */
244#define F_FILE		1		/* regular file */
245#define F_TTY		2		/* terminal */
246#define F_CONSOLE	3		/* console terminal */
247#define F_FORW		4		/* remote machine */
248#define F_USERS		5		/* list of users */
249#define F_WALL		6		/* everyone logged on */
250#define F_PIPE		7		/* pipe to program */
251
252const char *TypeNames[8] = {
253	"UNUSED",	"FILE",		"TTY",		"CONSOLE",
254	"FORW",		"USERS",	"WALL",		"PIPE"
255};
256
257struct	filed *Files;
258struct	filed consfile;
259
260int	Debug;			/* debug flag */
261int	resolve = 1;		/* resolve hostname */
262char	LocalHostName[MAXHOSTNAMELEN];	/* our hostname */
263const char	*LocalDomain;		/* our local domain name */
264int	*finet = NULL;		/* Internet datagram socket */
265int	fklog = -1;		/* /dev/klog */
266int	Initialized = 0;	/* set when we have initialized ourselves */
267int	MarkInterval = 20 * 60;	/* interval between marks in seconds */
268int	MarkSeq = 0;		/* mark sequence number */
269int	SecureMode = 0;		/* when true, receive only unix domain socks */
270#ifdef INET6
271int	family = PF_UNSPEC;	/* protocol family (IPv4, IPv6 or both) */
272#else
273int	family = PF_INET;	/* protocol family (IPv4 only) */
274#endif
275int	send_to_all = 0;	/* send message to all IPv4/IPv6 addresses */
276
277char	bootfile[MAXLINE+1];	/* booted kernel file */
278
279struct allowedpeer *AllowedPeers;
280int	NumAllowed = 0;		/* # of AllowedPeer entries */
281
282int	UniquePriority = 0;	/* Only log specified priority? */
283int	LogFacPri = 0;		/* Put facility and priority in log message: */
284				/* 0=no, 1=numeric, 2=names */
285int	KeepKernFac = 0;	/* Keep remotely logged kernel facility */
286
287volatile sig_atomic_t MarkSet, WantDie;
288
289int	allowaddr __P((char *));
290void	cfline __P((const char *, struct filed *, const char *, const char *));
291const char	*cvthname __P((struct sockaddr *));
292void	deadq_enter __P((pid_t, const char *));
293int	deadq_remove __P((pid_t));
294int	decode __P((const char *, CODE *));
295void	die __P((int));
296void	dodie __P((int));
297void	domark __P((int));
298void	fprintlog __P((struct filed *, int, const char *));
299int*	socksetup __P((int, const char *));
300void	init __P((int));
301void	logerror __P((const char *));
302void	logmsg __P((int, const char *, const char *, int));
303void	log_deadchild __P((pid_t, int, const char *));
304void	markit __P((void));
305void	printline __P((const char *, char *));
306void	printsys __P((char *));
307int	p_open __P((const char *, pid_t *));
308void	readklog __P((void));
309void	reapchild __P((int));
310static void	usage __P((void));
311int	validate __P((struct sockaddr *, const char *));
312static void	unmapped __P((struct sockaddr *));
313void	wallmsg __P((struct filed *, struct iovec *));
314int	waitdaemon __P((int, int, int));
315void	timedout __P((int));
316
317int
318main(argc, argv)
319	int argc;
320	char *argv[];
321{
322	int ch, i, fdsrmax = 0, l;
323	struct sockaddr_un sunx, fromunix;
324	struct sockaddr_storage frominet;
325	fd_set *fdsr = NULL;
326	FILE *fp;
327	char line[MAXLINE + 1];
328	const char *bindhostname, *hname;
329	struct timeval tv, *tvp;
330	struct sigaction sact;
331	sigset_t mask;
332	pid_t ppid = 1;
333	socklen_t len;
334
335	bindhostname = NULL;
336	while ((ch = getopt(argc, argv, "46Aa:b:df:kl:m:np:P:suv")) != -1)
337		switch (ch) {
338		case '4':
339			family = PF_INET;
340			break;
341#ifdef INET6
342		case '6':
343			family = PF_INET6;
344			break;
345#endif
346		case 'A':
347			send_to_all++;
348			break;
349		case 'a':		/* allow specific network addresses only */
350			if (allowaddr(optarg) == -1)
351				usage();
352			break;
353		case 'b':
354			bindhostname = optarg;
355			break;
356		case 'd':		/* debug */
357			Debug++;
358			break;
359		case 'f':		/* configuration file */
360			ConfFile = optarg;
361			break;
362		case 'k':		/* keep remote kern fac */
363			KeepKernFac = 1;
364			break;
365		case 'l':
366			if (nfunix < MAXFUNIX)
367				funixn[nfunix++] = optarg;
368			else
369				warnx("out of descriptors, ignoring %s",
370					optarg);
371			break;
372		case 'm':		/* mark interval */
373			MarkInterval = atoi(optarg) * 60;
374			break;
375		case 'n':
376			resolve = 0;
377			break;
378		case 'p':		/* path */
379			funixn[0] = optarg;
380			break;
381		case 'P':		/* path for alt. PID */
382			PidFile = optarg;
383			break;
384		case 's':		/* no network mode */
385			SecureMode++;
386			break;
387		case 'u':		/* only log specified priority */
388		        UniquePriority++;
389			break;
390		case 'v':		/* log facility and priority */
391		  	LogFacPri++;
392			break;
393		case '?':
394		default:
395			usage();
396		}
397	if ((argc -= optind) != 0)
398		usage();
399
400	if (!Debug) {
401		ppid = waitdaemon(0, 0, 30);
402		if (ppid < 0)
403			err(1, "could not become daemon");
404	} else
405		setlinebuf(stdout);
406
407	if (NumAllowed)
408		endservent();
409
410	consfile.f_type = F_CONSOLE;
411	(void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
412	    sizeof(consfile.f_un.f_fname));
413	(void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
414	(void)signal(SIGTERM, dodie);
415	(void)signal(SIGINT, Debug ? dodie : SIG_IGN);
416	(void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
417	/*
418	 * We don't want the SIGCHLD and SIGHUP handlers to interfere
419	 * with each other; they are likely candidates for being called
420	 * simultaneously (SIGHUP closes pipe descriptor, process dies,
421	 * SIGCHLD happens).
422	 */
423	sigemptyset(&mask);
424	sigaddset(&mask, SIGHUP);
425	sact.sa_handler = reapchild;
426	sact.sa_mask = mask;
427	sact.sa_flags = SA_RESTART;
428	(void)sigaction(SIGCHLD, &sact, NULL);
429	(void)signal(SIGALRM, domark);
430	(void)signal(SIGPIPE, SIG_IGN);	/* We'll catch EPIPE instead. */
431	(void)alarm(TIMERINTVL);
432
433	TAILQ_INIT(&deadq_head);
434
435#ifndef SUN_LEN
436#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
437#endif
438	for (i = 0; i < nfunix; i++) {
439		memset(&sunx, 0, sizeof(sunx));
440		sunx.sun_family = AF_UNIX;
441		(void)strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path));
442		funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0);
443		if (funix[i] < 0 ||
444		    bind(funix[i], (struct sockaddr *)&sunx,
445			 SUN_LEN(&sunx)) < 0 ||
446		    chmod(funixn[i], 0666) < 0) {
447			(void) snprintf(line, sizeof line,
448					"cannot create %s", funixn[i]);
449			logerror(line);
450			dprintf("cannot create %s (%d)\n", funixn[i], errno);
451			if (i == 0)
452				die(0);
453		}
454	}
455	if (SecureMode <= 1)
456		finet = socksetup(family, bindhostname);
457
458	if (finet) {
459		if (SecureMode) {
460			for (i = 0; i < *finet; i++) {
461				if (shutdown(finet[i+1], SHUT_RD) < 0) {
462					logerror("shutdown");
463					if (!Debug)
464						die(0);
465				}
466			}
467		} else
468			dprintf("listening on inet and/or inet6 socket\n");
469		dprintf("sending on inet and/or inet6 socket\n");
470	}
471
472	if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
473		if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
474			fklog = -1;
475	if (fklog < 0)
476		dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
477
478	/* tuck my process id away */
479	fp = fopen(PidFile, "w");
480	if (fp != NULL) {
481		fprintf(fp, "%d\n", getpid());
482		(void) fclose(fp);
483	}
484
485	dprintf("off & running....\n");
486
487	init(0);
488	/* prevent SIGHUP and SIGCHLD handlers from running in parallel */
489	sigemptyset(&mask);
490	sigaddset(&mask, SIGCHLD);
491	sact.sa_handler = init;
492	sact.sa_mask = mask;
493	sact.sa_flags = SA_RESTART;
494	(void)sigaction(SIGHUP, &sact, NULL);
495
496	tvp = &tv;
497	tv.tv_sec = tv.tv_usec = 0;
498
499	if (fklog != -1 && fklog > fdsrmax)
500		fdsrmax = fklog;
501	if (finet && !SecureMode) {
502		for (i = 0; i < *finet; i++) {
503		    if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
504			fdsrmax = finet[i+1];
505		}
506	}
507	for (i = 0; i < nfunix; i++) {
508		if (funix[i] != -1 && funix[i] > fdsrmax)
509			fdsrmax = funix[i];
510	}
511
512	fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
513	    sizeof(fd_mask));
514	if (fdsr == NULL)
515		errx(1, "calloc fd_set");
516
517	for (;;) {
518		if (MarkSet)
519			markit();
520		if (WantDie)
521			die(WantDie);
522
523		bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
524		    sizeof(fd_mask));
525
526		if (fklog != -1)
527			FD_SET(fklog, fdsr);
528		if (finet && !SecureMode) {
529			for (i = 0; i < *finet; i++) {
530				if (finet[i+1] != -1)
531					FD_SET(finet[i+1], fdsr);
532			}
533		}
534		for (i = 0; i < nfunix; i++) {
535			if (funix[i] != -1)
536				FD_SET(funix[i], fdsr);
537		}
538
539		i = select(fdsrmax+1, fdsr, NULL, NULL, tvp);
540		switch (i) {
541		case 0:
542			if (tvp) {
543				tvp = NULL;
544				if (ppid != 1)
545					kill(ppid, SIGALRM);
546			}
547			continue;
548		case -1:
549			if (errno != EINTR)
550				logerror("select");
551			continue;
552		}
553		if (fklog != -1 && FD_ISSET(fklog, fdsr))
554			readklog();
555		if (finet && !SecureMode) {
556			for (i = 0; i < *finet; i++) {
557				if (FD_ISSET(finet[i+1], fdsr)) {
558					len = sizeof(frominet);
559					l = recvfrom(finet[i+1], line, MAXLINE,
560					     0, (struct sockaddr *)&frominet,
561					     &len);
562					if (l > 0) {
563						line[l] = '\0';
564						hname = cvthname((struct sockaddr *)&frominet);
565						unmapped((struct sockaddr *)&frominet);
566						if (validate((struct sockaddr *)&frominet, hname))
567							printline(hname, line);
568					} else if (l < 0 && errno != EINTR)
569						logerror("recvfrom inet");
570				}
571			}
572		}
573		for (i = 0; i < nfunix; i++) {
574			if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) {
575				len = sizeof(fromunix);
576				l = recvfrom(funix[i], line, MAXLINE, 0,
577				    (struct sockaddr *)&fromunix, &len);
578				if (l > 0) {
579					line[l] = '\0';
580					printline(LocalHostName, line);
581				} else if (l < 0 && errno != EINTR)
582					logerror("recvfrom unix");
583			}
584		}
585	}
586	if (fdsr)
587		free(fdsr);
588}
589
590static void
591unmapped(sa)
592	struct sockaddr *sa;
593{
594	struct sockaddr_in6 *sin6;
595	struct sockaddr_in sin4;
596
597	if (sa->sa_family != AF_INET6)
598		return;
599	if (sa->sa_len != sizeof(struct sockaddr_in6) ||
600	    sizeof(sin4) > sa->sa_len)
601		return;
602	sin6 = (struct sockaddr_in6 *)sa;
603	if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
604		return;
605
606	memset(&sin4, 0, sizeof(sin4));
607	sin4.sin_family = AF_INET;
608	sin4.sin_len = sizeof(struct sockaddr_in);
609	memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
610	       sizeof(sin4.sin_addr));
611	sin4.sin_port = sin6->sin6_port;
612
613	memcpy(sa, &sin4, sin4.sin_len);
614}
615
616static void
617usage()
618{
619
620	fprintf(stderr, "%s\n%s\n%s\n",
621		"usage: syslogd [-46Adnsuv] [-a allowed_peer] [-f config_file]",
622		"               [-m mark_interval] [-l log_socket]",
623		"               [-p log_socket] [-P pid_file]");
624	exit(1);
625}
626
627/*
628 * Take a raw input line, decode the message, and print the message
629 * on the appropriate log files.
630 */
631void
632printline(hname, msg)
633	const char *hname;
634	char *msg;
635{
636	int c, pri;
637	char *p, *q, line[MAXLINE + 1];
638
639	/* test for special codes */
640	pri = DEFUPRI;
641	p = msg;
642	if (*p == '<') {
643		pri = 0;
644		while (isdigit(*++p))
645			pri = 10 * pri + (*p - '0');
646		if (*p == '>')
647			++p;
648	}
649	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
650		pri = DEFUPRI;
651
652	/* don't allow users to log kernel messages */
653	if (LOG_FAC(pri) == LOG_KERN && !KeepKernFac)
654		pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
655
656	q = line;
657
658	while ((c = (unsigned char)*p++) != '\0' &&
659	    q < &line[sizeof(line) - 4]) {
660		if ((c & 0x80) && c < 0xA0) {
661			c &= 0x7F;
662			*q++ = 'M';
663			*q++ = '-';
664		}
665		if (isascii(c) && iscntrl(c)) {
666			if (c == '\n')
667				*q++ = ' ';
668			else if (c == '\t')
669				*q++ = '\t';
670			else {
671				*q++ = '^';
672				*q++ = c ^ 0100;
673			}
674		} else
675			*q++ = c;
676	}
677	*q = '\0';
678
679	logmsg(pri, line, hname, 0);
680}
681
682/*
683 * Read /dev/klog while data are available, split into lines.
684 */
685void
686readklog()
687{
688	char *p, *q, line[MAXLINE + 1];
689	int len, i;
690
691	len = 0;
692	for (;;) {
693		i = read(fklog, line + len, MAXLINE - 1 - len);
694		if (i > 0)
695			line[i + len] = '\0';
696		else if (i < 0 && errno != EINTR && errno != EAGAIN) {
697			logerror("klog");
698			fklog = -1;
699			break;
700		} else
701			break;
702
703		for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
704			*q = '\0';
705			printsys(p);
706		}
707		len = strlen(p);
708		if (len >= MAXLINE - 1) {
709			printsys(p);
710			len = 0;
711		}
712		if (len > 0)
713			memmove(line, p, len + 1);
714	}
715	if (len > 0)
716		printsys(line);
717}
718
719/*
720 * Take a raw input line from /dev/klog, format similar to syslog().
721 */
722void
723printsys(p)
724	char *p;
725{
726	int pri, flags;
727
728	flags = ISKERNEL | SYNC_FILE | ADDDATE;	/* fsync after write */
729	pri = DEFSPRI;
730	if (*p == '<') {
731		pri = 0;
732		while (isdigit(*++p))
733			pri = 10 * pri + (*p - '0');
734		if (*p == '>')
735			++p;
736		if ((pri & LOG_FACMASK) == LOG_CONSOLE)
737			flags |= IGN_CONS;
738	} else {
739		/* kernel printf's come out on console */
740		flags |= IGN_CONS;
741	}
742	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
743		pri = DEFSPRI;
744	logmsg(pri, p, LocalHostName, flags);
745}
746
747time_t	now;
748
749/*
750 * Log a message to the appropriate log files, users, etc. based on
751 * the priority.
752 */
753void
754logmsg(pri, msg, from, flags)
755	int pri;
756	const char *msg, *from;
757	int flags;
758{
759	struct filed *f;
760	int i, fac, msglen, omask, prilev;
761	const char *timestamp;
762 	char prog[NAME_MAX+1];
763	char buf[MAXLINE+1];
764
765	dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
766	    pri, flags, from, msg);
767
768	omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
769
770	/*
771	 * Check to see if msg looks non-standard.
772	 */
773	msglen = strlen(msg);
774	if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
775	    msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
776		flags |= ADDDATE;
777
778	(void)time(&now);
779	if (flags & ADDDATE)
780		timestamp = ctime(&now) + 4;
781	else {
782		timestamp = msg;
783		msg += 16;
784		msglen -= 16;
785	}
786
787	/* skip leading blanks */
788	while (isspace(*msg)) {
789		msg++;
790		msglen--;
791	}
792
793	/* extract facility and priority level */
794	if (flags & MARK)
795		fac = LOG_NFACILITIES;
796	else
797		fac = LOG_FAC(pri);
798	prilev = LOG_PRI(pri);
799
800	/* extract program name */
801	for (i = 0; i < NAME_MAX; i++) {
802		if (!isalnum(msg[i]))
803			break;
804		prog[i] = msg[i];
805	}
806	prog[i] = 0;
807
808	/* add kernel prefix for kernel messages */
809	if (flags & ISKERNEL) {
810		snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg);
811		msg = buf;
812		msglen = strlen(buf);
813	}
814
815	/* log the message to the particular outputs */
816	if (!Initialized) {
817		f = &consfile;
818		f->f_file = open(ctty, O_WRONLY, 0);
819
820		if (f->f_file >= 0) {
821			fprintlog(f, flags, msg);
822			(void)close(f->f_file);
823		}
824		(void)sigsetmask(omask);
825		return;
826	}
827	for (f = Files; f; f = f->f_next) {
828		/* skip messages that are incorrect priority */
829		if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
830		     ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
831		     ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
832		     )
833		    || f->f_pmask[fac] == INTERNAL_NOPRI)
834			continue;
835		/* skip messages with the incorrect hostname */
836		if (f->f_host)
837			switch (f->f_host[0]) {
838			case '+':
839				if (strcmp(from, f->f_host + 1) != 0)
840					continue;
841				break;
842			case '-':
843				if (strcmp(from, f->f_host + 1) == 0)
844					continue;
845				break;
846			}
847
848		/* skip messages with the incorrect program name */
849		if (f->f_program)
850			if (strcmp(prog, f->f_program) != 0)
851				continue;
852
853		if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
854			continue;
855
856		/* don't output marks to recently written files */
857		if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
858			continue;
859
860		/*
861		 * suppress duplicate lines to this file
862		 */
863		if ((flags & MARK) == 0 && msglen == f->f_prevlen &&
864		    !strcmp(msg, f->f_prevline) &&
865		    !strcasecmp(from, f->f_prevhost)) {
866			(void)strlcpy(f->f_lasttime, timestamp, 16);
867			f->f_prevcount++;
868			dprintf("msg repeated %d times, %ld sec of %d\n",
869			    f->f_prevcount, (long)(now - f->f_time),
870			    repeatinterval[f->f_repeatcount]);
871			/*
872			 * If domark would have logged this by now,
873			 * flush it now (so we don't hold isolated messages),
874			 * but back off so we'll flush less often
875			 * in the future.
876			 */
877			if (now > REPEATTIME(f)) {
878				fprintlog(f, flags, (char *)NULL);
879				BACKOFF(f);
880			}
881		} else {
882			/* new line, save it */
883			if (f->f_prevcount)
884				fprintlog(f, 0, (char *)NULL);
885			f->f_repeatcount = 0;
886			f->f_prevpri = pri;
887			(void)strlcpy(f->f_lasttime, timestamp, 16);
888			(void)strlcpy(f->f_prevhost, from,
889			    sizeof(f->f_prevhost));
890			if (msglen < MAXSVLINE) {
891				f->f_prevlen = msglen;
892				(void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
893				fprintlog(f, flags, (char *)NULL);
894			} else {
895				f->f_prevline[0] = 0;
896				f->f_prevlen = 0;
897				fprintlog(f, flags, msg);
898			}
899		}
900	}
901	(void)sigsetmask(omask);
902}
903
904void
905fprintlog(f, flags, msg)
906	struct filed *f;
907	int flags;
908	const char *msg;
909{
910	struct iovec iov[7];
911	struct iovec *v;
912	struct addrinfo *r;
913	int i, l, lsent = 0;
914	char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg;
915	const char *msgret;
916
917	v = iov;
918	if (f->f_type == F_WALL) {
919		v->iov_base = greetings;
920		v->iov_len = snprintf(greetings, sizeof greetings,
921		    "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
922		    f->f_prevhost, ctime(&now));
923		if (v->iov_len > 0)
924			v++;
925		v->iov_base = "";
926		v->iov_len = 0;
927		v++;
928	} else {
929		v->iov_base = f->f_lasttime;
930		v->iov_len = 15;
931		v++;
932		v->iov_base = " ";
933		v->iov_len = 1;
934		v++;
935	}
936
937	if (LogFacPri) {
938	  	static char fp_buf[30];	/* Hollow laugh */
939		int fac = f->f_prevpri & LOG_FACMASK;
940		int pri = LOG_PRI(f->f_prevpri);
941		const char *f_s = NULL;
942		char f_n[5];	/* Hollow laugh */
943		const char *p_s = NULL;
944		char p_n[5];	/* Hollow laugh */
945
946		if (LogFacPri > 1) {
947		  CODE *c;
948
949		  for (c = facilitynames; c->c_name; c++) {
950		    if (c->c_val == fac) {
951		      f_s = c->c_name;
952		      break;
953		    }
954		  }
955		  for (c = prioritynames; c->c_name; c++) {
956		    if (c->c_val == pri) {
957		      p_s = c->c_name;
958		      break;
959		    }
960		  }
961		}
962		if (!f_s) {
963		  snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
964		  f_s = f_n;
965		}
966		if (!p_s) {
967		  snprintf(p_n, sizeof p_n, "%d", pri);
968		  p_s = p_n;
969		}
970		snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
971		v->iov_base = fp_buf;
972		v->iov_len = strlen(fp_buf);
973	} else {
974	        v->iov_base="";
975		v->iov_len = 0;
976	}
977	v++;
978
979	v->iov_base = f->f_prevhost;
980	v->iov_len = strlen(v->iov_base);
981	v++;
982	v->iov_base = " ";
983	v->iov_len = 1;
984	v++;
985
986	if (msg) {
987		/* XXX should check for NULL return */
988		wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
989		v->iov_base = wmsg;
990		v->iov_len = strlen(msg);
991	} else if (f->f_prevcount > 1) {
992		v->iov_base = repbuf;
993		v->iov_len = snprintf(repbuf, sizeof repbuf,
994		    "last message repeated %d times", f->f_prevcount);
995	} else {
996		v->iov_base = f->f_prevline;
997		v->iov_len = f->f_prevlen;
998	}
999	v++;
1000
1001	dprintf("Logging to %s", TypeNames[f->f_type]);
1002	f->f_time = now;
1003
1004	switch (f->f_type) {
1005	case F_UNUSED:
1006		dprintf("\n");
1007		break;
1008
1009	case F_FORW:
1010		dprintf(" %s\n", f->f_un.f_forw.f_hname);
1011		/* check for local vs remote messages */
1012		if (strcasecmp(f->f_prevhost, LocalHostName))
1013			l = snprintf(line, sizeof line - 1,
1014			    "<%d>%.15s Forwarded from %s: %s",
1015			    f->f_prevpri, iov[0].iov_base, f->f_prevhost,
1016			    iov[5].iov_base);
1017		else
1018			l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1019			     f->f_prevpri, iov[0].iov_base, iov[5].iov_base);
1020		if (l < 0)
1021			l = 0;
1022		else if (l > MAXLINE)
1023			l = MAXLINE;
1024
1025		if (finet) {
1026			for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1027				for (i = 0; i < *finet; i++) {
1028#if 0
1029					/*
1030					 * should we check AF first, or just
1031					 * trial and error? FWD
1032					 */
1033					if (r->ai_family ==
1034					    address_family_of(finet[i+1]))
1035#endif
1036					lsent = sendto(finet[i+1], line, l, 0,
1037					    r->ai_addr, r->ai_addrlen);
1038					if (lsent == l)
1039						break;
1040				}
1041				if (lsent == l && !send_to_all)
1042					break;
1043			}
1044			if (lsent != l) {
1045				int e = errno;
1046				(void)close(f->f_file);
1047				errno = e;
1048				f->f_type = F_UNUSED;
1049				logerror("sendto");
1050			}
1051		}
1052		break;
1053
1054	case F_FILE:
1055		dprintf(" %s\n", f->f_un.f_fname);
1056		v->iov_base = "\n";
1057		v->iov_len = 1;
1058		if (writev(f->f_file, iov, 7) < 0) {
1059			int e = errno;
1060			(void)close(f->f_file);
1061			f->f_type = F_UNUSED;
1062			errno = e;
1063			logerror(f->f_un.f_fname);
1064		} else if (flags & SYNC_FILE)
1065			(void)fsync(f->f_file);
1066		break;
1067
1068	case F_PIPE:
1069		dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1070		v->iov_base = "\n";
1071		v->iov_len = 1;
1072		if (f->f_un.f_pipe.f_pid == 0) {
1073			if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1074						&f->f_un.f_pipe.f_pid)) < 0) {
1075				f->f_type = F_UNUSED;
1076				logerror(f->f_un.f_pipe.f_pname);
1077				break;
1078			}
1079		}
1080		if (writev(f->f_file, iov, 7) < 0) {
1081			int e = errno;
1082			(void)close(f->f_file);
1083			if (f->f_un.f_pipe.f_pid > 0)
1084				deadq_enter(f->f_un.f_pipe.f_pid,
1085					    f->f_un.f_pipe.f_pname);
1086			f->f_un.f_pipe.f_pid = 0;
1087			errno = e;
1088			logerror(f->f_un.f_pipe.f_pname);
1089		}
1090		break;
1091
1092	case F_CONSOLE:
1093		if (flags & IGN_CONS) {
1094			dprintf(" (ignored)\n");
1095			break;
1096		}
1097		/* FALLTHROUGH */
1098
1099	case F_TTY:
1100		dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1101		v->iov_base = "\r\n";
1102		v->iov_len = 2;
1103
1104		errno = 0;	/* ttymsg() only sometimes returns an errno */
1105		if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) {
1106			f->f_type = F_UNUSED;
1107			logerror(msgret);
1108		}
1109		break;
1110
1111	case F_USERS:
1112	case F_WALL:
1113		dprintf("\n");
1114		v->iov_base = "\r\n";
1115		v->iov_len = 2;
1116		wallmsg(f, iov);
1117		break;
1118	}
1119	f->f_prevcount = 0;
1120	if (msg)
1121		free(wmsg);
1122}
1123
1124/*
1125 *  WALLMSG -- Write a message to the world at large
1126 *
1127 *	Write the specified message to either the entire
1128 *	world, or a list of approved users.
1129 */
1130void
1131wallmsg(f, iov)
1132	struct filed *f;
1133	struct iovec *iov;
1134{
1135	static int reenter;			/* avoid calling ourselves */
1136	FILE *uf;
1137	struct utmp ut;
1138	int i;
1139	const char *p;
1140	char line[sizeof(ut.ut_line) + 1];
1141
1142	if (reenter++)
1143		return;
1144	if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1145		logerror(_PATH_UTMP);
1146		reenter = 0;
1147		return;
1148	}
1149	/* NOSTRICT */
1150	while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1151		if (ut.ut_name[0] == '\0')
1152			continue;
1153		(void)strlcpy(line, ut.ut_line, sizeof(line));
1154		if (f->f_type == F_WALL) {
1155			if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) {
1156				errno = 0;	/* already in msg */
1157				logerror(p);
1158			}
1159			continue;
1160		}
1161		/* should we send the message to this user? */
1162		for (i = 0; i < MAXUNAMES; i++) {
1163			if (!f->f_un.f_uname[i][0])
1164				break;
1165			if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1166			    UT_NAMESIZE)) {
1167				if ((p = ttymsg(iov, 7, line, TTYMSGTIME))
1168								!= NULL) {
1169					errno = 0;	/* already in msg */
1170					logerror(p);
1171				}
1172				break;
1173			}
1174		}
1175	}
1176	(void)fclose(uf);
1177	reenter = 0;
1178}
1179
1180void
1181reapchild(signo)
1182	int signo __unused;
1183{
1184	int status;
1185	pid_t pid;
1186	struct filed *f;
1187
1188	while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1189		if (!Initialized)
1190			/* Don't tell while we are initting. */
1191			continue;
1192
1193		/* First, look if it's a process from the dead queue. */
1194		if (deadq_remove(pid))
1195			goto oncemore;
1196
1197		/* Now, look in list of active processes. */
1198		for (f = Files; f; f = f->f_next)
1199			if (f->f_type == F_PIPE &&
1200			    f->f_un.f_pipe.f_pid == pid) {
1201				(void)close(f->f_file);
1202				f->f_un.f_pipe.f_pid = 0;
1203				log_deadchild(pid, status,
1204					      f->f_un.f_pipe.f_pname);
1205				break;
1206			}
1207	  oncemore:
1208		continue;
1209	}
1210}
1211
1212/*
1213 * Return a printable representation of a host address.
1214 */
1215const char *
1216cvthname(f)
1217	struct sockaddr *f;
1218{
1219	int error;
1220	sigset_t omask, nmask;
1221	char *p;
1222	static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1223
1224	error = getnameinfo((struct sockaddr *)f,
1225			    ((struct sockaddr *)f)->sa_len,
1226			    ip, sizeof ip, NULL, 0,
1227			    NI_NUMERICHOST | withscopeid);
1228	dprintf("cvthname(%s)\n", ip);
1229
1230	if (error) {
1231		dprintf("Malformed from address %s\n", gai_strerror(error));
1232		return ("???");
1233	}
1234	if (!resolve)
1235		return (ip);
1236
1237	sigemptyset(&nmask);
1238	sigaddset(&nmask, SIGHUP);
1239	sigprocmask(SIG_BLOCK, &nmask, &omask);
1240	error = getnameinfo((struct sockaddr *)f,
1241			    ((struct sockaddr *)f)->sa_len,
1242			    hname, sizeof hname, NULL, 0,
1243			    NI_NAMEREQD | withscopeid);
1244	sigprocmask(SIG_SETMASK, &omask, NULL);
1245	if (error) {
1246		dprintf("Host name for your address (%s) unknown\n", ip);
1247		return (ip);
1248	}
1249	/* XXX Not quite correct, but close enough for government work. */
1250	if ((p = strchr(hname, '.')) && strcasecmp(p + 1, LocalDomain) == 0)
1251		*p = '\0';
1252	return (hname);
1253}
1254
1255void
1256dodie(signo)
1257	int signo;
1258{
1259
1260	WantDie = signo;
1261}
1262
1263void
1264domark(signo)
1265	int signo __unused;
1266{
1267
1268	MarkSet = 1;
1269}
1270
1271/*
1272 * Print syslogd errors some place.
1273 */
1274void
1275logerror(type)
1276	const char *type;
1277{
1278	char buf[512];
1279
1280	if (errno)
1281		(void)snprintf(buf,
1282		    sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1283	else
1284		(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1285	errno = 0;
1286	dprintf("%s\n", buf);
1287	logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1288}
1289
1290void
1291die(signo)
1292	int signo;
1293{
1294	struct filed *f;
1295	int was_initialized;
1296	char buf[100];
1297	int i;
1298
1299	was_initialized = Initialized;
1300	Initialized = 0;	/* Don't log SIGCHLDs. */
1301	for (f = Files; f != NULL; f = f->f_next) {
1302		/* flush any pending output */
1303		if (f->f_prevcount)
1304			fprintlog(f, 0, (char *)NULL);
1305		if (f->f_type == F_PIPE)
1306			(void)close(f->f_file);
1307	}
1308	Initialized = was_initialized;
1309	if (signo) {
1310		dprintf("syslogd: exiting on signal %d\n", signo);
1311		(void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1312		errno = 0;
1313		logerror(buf);
1314	}
1315	for (i = 0; i < nfunix; i++)
1316		if (funixn[i] && funix[i] != -1)
1317			(void)unlink(funixn[i]);
1318	exit(1);
1319}
1320
1321/*
1322 *  INIT -- Initialize syslogd from configuration table
1323 */
1324void
1325init(signo)
1326	int signo;
1327{
1328	int i;
1329	FILE *cf;
1330	struct filed *f, *next, **nextp;
1331	char *p;
1332	char cline[LINE_MAX];
1333 	char prog[NAME_MAX+1];
1334	char host[MAXHOSTNAMELEN];
1335	char oldLocalHostName[MAXHOSTNAMELEN];
1336	char hostMsg[2*MAXHOSTNAMELEN+40];
1337
1338	dprintf("init\n");
1339
1340	/*
1341	 * Load hostname (may have changed).
1342	 */
1343	if (signo != 0)
1344		(void)strlcpy(oldLocalHostName, LocalHostName,
1345		    sizeof(oldLocalHostName));
1346	if (gethostname(LocalHostName, sizeof(LocalHostName)))
1347		err(EX_OSERR, "gethostname() failed");
1348	if ((p = strchr(LocalHostName, '.')) != NULL) {
1349		*p++ = '\0';
1350		LocalDomain = p;
1351	} else
1352		LocalDomain = "";
1353
1354	/*
1355	 *  Close all open log files.
1356	 */
1357	Initialized = 0;
1358	for (f = Files; f != NULL; f = next) {
1359		/* flush any pending output */
1360		if (f->f_prevcount)
1361			fprintlog(f, 0, (char *)NULL);
1362
1363		switch (f->f_type) {
1364		case F_FILE:
1365		case F_FORW:
1366		case F_CONSOLE:
1367		case F_TTY:
1368			(void)close(f->f_file);
1369			break;
1370		case F_PIPE:
1371			(void)close(f->f_file);
1372			if (f->f_un.f_pipe.f_pid > 0)
1373				deadq_enter(f->f_un.f_pipe.f_pid,
1374					    f->f_un.f_pipe.f_pname);
1375			f->f_un.f_pipe.f_pid = 0;
1376			break;
1377		}
1378		next = f->f_next;
1379		if (f->f_program) free(f->f_program);
1380		if (f->f_host) free(f->f_host);
1381		free((char *)f);
1382	}
1383	Files = NULL;
1384	nextp = &Files;
1385
1386	/* open the configuration file */
1387	if ((cf = fopen(ConfFile, "r")) == NULL) {
1388		dprintf("cannot open %s\n", ConfFile);
1389		/* XXX should check for NULL return */
1390		*nextp = (struct filed *)calloc(1, sizeof(*f));
1391		cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1392		/* XXX should check for NULL return */
1393		(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1394		cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1395		Initialized = 1;
1396		return;
1397	}
1398
1399	/*
1400	 *  Foreach line in the conf table, open that file.
1401	 */
1402	f = NULL;
1403	(void)strlcpy(host, "*", sizeof(host));
1404	(void)strlcpy(prog, "*", sizeof(prog));
1405	while (fgets(cline, sizeof(cline), cf) != NULL) {
1406		/*
1407		 * check for end-of-section, comments, strip off trailing
1408		 * spaces and newline character. #!prog is treated specially:
1409		 * following lines apply only to that program.
1410		 */
1411		for (p = cline; isspace(*p); ++p)
1412			continue;
1413		if (*p == 0)
1414			continue;
1415		if (*p == '#') {
1416			p++;
1417			if (*p != '!' && *p != '+' && *p != '-')
1418				continue;
1419		}
1420		if (*p == '+' || *p == '-') {
1421			host[0] = *p++;
1422			while (isspace(*p))
1423				p++;
1424			if ((!*p) || (*p == '*')) {
1425				(void)strlcpy(host, "*", sizeof(host));
1426				continue;
1427			}
1428			if (*p == '@')
1429				p = LocalHostName;
1430			for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1431				if (!isalnum(*p) && *p != '.' && *p != '-')
1432					break;
1433				host[i] = *p++;
1434			}
1435			host[i] = '\0';
1436			continue;
1437		}
1438		if (*p == '!') {
1439			p++;
1440			while (isspace(*p)) p++;
1441			if ((!*p) || (*p == '*')) {
1442				(void)strlcpy(prog, "*", sizeof(prog));
1443				continue;
1444			}
1445			for (i = 0; i < NAME_MAX; i++) {
1446				if (!isalnum(p[i]))
1447					break;
1448				prog[i] = p[i];
1449			}
1450			prog[i] = 0;
1451			continue;
1452		}
1453		for (p = strchr(cline, '\0'); isspace(*--p);)
1454			continue;
1455		*++p = '\0';
1456		/* XXX should check for NULL return */
1457		f = (struct filed *)calloc(1, sizeof(*f));
1458		*nextp = f;
1459		nextp = &f->f_next;
1460		cfline(cline, f, prog, host);
1461	}
1462
1463	/* close the configuration file */
1464	(void)fclose(cf);
1465
1466	Initialized = 1;
1467
1468	if (Debug) {
1469		for (f = Files; f; f = f->f_next) {
1470			for (i = 0; i <= LOG_NFACILITIES; i++)
1471				if (f->f_pmask[i] == INTERNAL_NOPRI)
1472					printf("X ");
1473				else
1474					printf("%d ", f->f_pmask[i]);
1475			printf("%s: ", TypeNames[f->f_type]);
1476			switch (f->f_type) {
1477			case F_FILE:
1478				printf("%s", f->f_un.f_fname);
1479				break;
1480
1481			case F_CONSOLE:
1482			case F_TTY:
1483				printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1484				break;
1485
1486			case F_FORW:
1487				printf("%s", f->f_un.f_forw.f_hname);
1488				break;
1489
1490			case F_PIPE:
1491				printf("%s", f->f_un.f_pipe.f_pname);
1492				break;
1493
1494			case F_USERS:
1495				for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1496					printf("%s, ", f->f_un.f_uname[i]);
1497				break;
1498			}
1499			if (f->f_program)
1500				printf(" (%s)", f->f_program);
1501			printf("\n");
1502		}
1503	}
1504
1505	logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1506	dprintf("syslogd: restarted\n");
1507	/*
1508	 * Log a change in hostname, but only on a restart.
1509	 */
1510	if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1511		(void)snprintf(hostMsg, sizeof(hostMsg),
1512		    "syslogd: hostname changed, \"%s\" to \"%s\"",
1513		    oldLocalHostName, LocalHostName);
1514		logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1515		dprintf("%s\n", hostMsg);
1516	}
1517}
1518
1519/*
1520 * Crack a configuration file line
1521 */
1522void
1523cfline(line, f, prog, host)
1524	const char *line;
1525	struct filed *f;
1526	const char *prog;
1527	const char *host;
1528{
1529	struct addrinfo hints, *res;
1530	int error, i, pri;
1531	const char *p, *q;
1532	char *bp;
1533	char buf[MAXLINE], ebuf[100];
1534
1535	dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1536
1537	errno = 0;	/* keep strerror() stuff out of logerror messages */
1538
1539	/* clear out file entry */
1540	memset(f, 0, sizeof(*f));
1541	for (i = 0; i <= LOG_NFACILITIES; i++)
1542		f->f_pmask[i] = INTERNAL_NOPRI;
1543
1544	/* save hostname if any */
1545	if (host && *host == '*')
1546		host = NULL;
1547	if (host) {
1548		int hl, dl;
1549
1550		/* XXX should check for NULL return */
1551		f->f_host = strdup(host);
1552		hl = strlen(f->f_host);
1553		if (f->f_host[hl-1] == '.')
1554			f->f_host[--hl] = '\0';
1555		dl = strlen(LocalDomain) + 1;
1556		if (hl > dl && f->f_host[hl-dl] == '.' &&
1557		    strcasecmp(f->f_host + hl - dl + 1, LocalDomain) == 0)
1558			f->f_host[hl-dl] = '\0';
1559	}
1560
1561	/* save program name if any */
1562	if (prog && *prog == '*')
1563		prog = NULL;
1564	if (prog)
1565		/* XXX should check for NULL return */
1566		f->f_program = strdup(prog);
1567
1568	/* scan through the list of selectors */
1569	for (p = line; *p && *p != '\t' && *p != ' ';) {
1570		int pri_done;
1571		int pri_cmp;
1572
1573		/* find the end of this facility name list */
1574		for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1575			continue;
1576
1577		/* get the priority comparison */
1578		pri_cmp = 0;
1579		pri_done = 0;
1580		while (!pri_done) {
1581			switch (*q) {
1582			case '<':
1583				pri_cmp |= PRI_LT;
1584				q++;
1585				break;
1586			case '=':
1587				pri_cmp |= PRI_EQ;
1588				q++;
1589				break;
1590			case '>':
1591				pri_cmp |= PRI_GT;
1592				q++;
1593				break;
1594			default:
1595				pri_done++;
1596				break;
1597			}
1598		}
1599		if (!pri_cmp)
1600			pri_cmp = (UniquePriority)
1601				  ? (PRI_EQ)
1602				  : (PRI_EQ | PRI_GT)
1603				  ;
1604
1605		/* collect priority name */
1606		for (bp = buf; *q && !strchr("\t,; ", *q); )
1607			*bp++ = *q++;
1608		*bp = '\0';
1609
1610		/* skip cruft */
1611		while (strchr(",;", *q))
1612			q++;
1613
1614		/* decode priority name */
1615		if (*buf == '*')
1616			pri = LOG_PRIMASK + 1;
1617		else {
1618			pri = decode(buf, prioritynames);
1619			if (pri < 0) {
1620				(void)snprintf(ebuf, sizeof ebuf,
1621				    "unknown priority name \"%s\"", buf);
1622				logerror(ebuf);
1623				return;
1624			}
1625		}
1626
1627		/* scan facilities */
1628		while (*p && !strchr("\t.; ", *p)) {
1629			for (bp = buf; *p && !strchr("\t,;. ", *p); )
1630				*bp++ = *p++;
1631			*bp = '\0';
1632
1633			if (*buf == '*')
1634				for (i = 0; i < LOG_NFACILITIES; i++) {
1635					f->f_pmask[i] = pri;
1636					f->f_pcmp[i] = pri_cmp;
1637				}
1638			else {
1639				i = decode(buf, facilitynames);
1640				if (i < 0) {
1641					(void)snprintf(ebuf, sizeof ebuf,
1642					    "unknown facility name \"%s\"",
1643					    buf);
1644					logerror(ebuf);
1645					return;
1646				}
1647				f->f_pmask[i >> 3] = pri;
1648				f->f_pcmp[i >> 3] = pri_cmp;
1649			}
1650			while (*p == ',' || *p == ' ')
1651				p++;
1652		}
1653
1654		p = q;
1655	}
1656
1657	/* skip to action part */
1658	while (*p == '\t' || *p == ' ')
1659		p++;
1660
1661	switch (*p)
1662	{
1663	case '@':
1664		(void)strlcpy(f->f_un.f_forw.f_hname, ++p,
1665			sizeof(f->f_un.f_forw.f_hname));
1666		memset(&hints, 0, sizeof(hints));
1667		hints.ai_family = family;
1668		hints.ai_socktype = SOCK_DGRAM;
1669		error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints,
1670				    &res);
1671		if (error) {
1672			logerror(gai_strerror(error));
1673			break;
1674		}
1675		f->f_un.f_forw.f_addr = res;
1676		f->f_type = F_FORW;
1677		break;
1678
1679	case '/':
1680		if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
1681			f->f_type = F_UNUSED;
1682			logerror(p);
1683			break;
1684		}
1685		if (isatty(f->f_file)) {
1686			if (strcmp(p, ctty) == 0)
1687				f->f_type = F_CONSOLE;
1688			else
1689				f->f_type = F_TTY;
1690			(void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
1691			    sizeof(f->f_un.f_fname));
1692		} else {
1693			(void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
1694			f->f_type = F_FILE;
1695		}
1696		break;
1697
1698	case '|':
1699		f->f_un.f_pipe.f_pid = 0;
1700		(void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname));
1701		f->f_type = F_PIPE;
1702		break;
1703
1704	case '*':
1705		f->f_type = F_WALL;
1706		break;
1707
1708	default:
1709		for (i = 0; i < MAXUNAMES && *p; i++) {
1710			for (q = p; *q && *q != ','; )
1711				q++;
1712			(void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
1713			if ((q - p) > UT_NAMESIZE)
1714				f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
1715			else
1716				f->f_un.f_uname[i][q - p] = '\0';
1717			while (*q == ',' || *q == ' ')
1718				q++;
1719			p = q;
1720		}
1721		f->f_type = F_USERS;
1722		break;
1723	}
1724}
1725
1726
1727/*
1728 *  Decode a symbolic name to a numeric value
1729 */
1730int
1731decode(name, codetab)
1732	const char *name;
1733	CODE *codetab;
1734{
1735	CODE *c;
1736	char *p, buf[40];
1737
1738	if (isdigit(*name))
1739		return (atoi(name));
1740
1741	for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
1742		if (isupper(*name))
1743			*p = tolower(*name);
1744		else
1745			*p = *name;
1746	}
1747	*p = '\0';
1748	for (c = codetab; c->c_name; c++)
1749		if (!strcmp(buf, c->c_name))
1750			return (c->c_val);
1751
1752	return (-1);
1753}
1754
1755void
1756markit(void)
1757{
1758	struct filed *f;
1759	dq_t q;
1760
1761	now = time((time_t *)NULL);
1762	MarkSeq += TIMERINTVL;
1763	if (MarkSeq >= MarkInterval) {
1764		logmsg(LOG_INFO, "-- MARK --",
1765		    LocalHostName, ADDDATE|MARK);
1766		MarkSeq = 0;
1767	}
1768
1769	for (f = Files; f; f = f->f_next) {
1770		if (f->f_prevcount && now >= REPEATTIME(f)) {
1771			dprintf("flush %s: repeated %d times, %d sec.\n",
1772			    TypeNames[f->f_type], f->f_prevcount,
1773			    repeatinterval[f->f_repeatcount]);
1774			fprintlog(f, 0, (char *)NULL);
1775			BACKOFF(f);
1776		}
1777	}
1778
1779	/* Walk the dead queue, and see if we should signal somebody. */
1780	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
1781		switch (q->dq_timeout) {
1782		case 0:
1783			/* Already signalled once, try harder now. */
1784			if (kill(q->dq_pid, SIGKILL) != 0)
1785				(void)deadq_remove(q->dq_pid);
1786			break;
1787
1788		case 1:
1789			/*
1790			 * Timed out on dead queue, send terminate
1791			 * signal.  Note that we leave the removal
1792			 * from the dead queue to reapchild(), which
1793			 * will also log the event (unless the process
1794			 * didn't even really exist, in case we simply
1795			 * drop it from the dead queue).
1796			 */
1797			if (kill(q->dq_pid, SIGTERM) != 0)
1798				(void)deadq_remove(q->dq_pid);
1799			/* FALLTHROUGH */
1800
1801		default:
1802			q->dq_timeout--;
1803		}
1804	MarkSet = 0;
1805	(void)alarm(TIMERINTVL);
1806}
1807
1808/*
1809 * fork off and become a daemon, but wait for the child to come online
1810 * before returing to the parent, or we get disk thrashing at boot etc.
1811 * Set a timer so we don't hang forever if it wedges.
1812 */
1813int
1814waitdaemon(nochdir, noclose, maxwait)
1815	int nochdir, noclose, maxwait;
1816{
1817	int fd;
1818	int status;
1819	pid_t pid, childpid;
1820
1821	switch (childpid = fork()) {
1822	case -1:
1823		return (-1);
1824	case 0:
1825		break;
1826	default:
1827		signal(SIGALRM, timedout);
1828		alarm(maxwait);
1829		while ((pid = wait3(&status, 0, NULL)) != -1) {
1830			if (WIFEXITED(status))
1831				errx(1, "child pid %d exited with return code %d",
1832					pid, WEXITSTATUS(status));
1833			if (WIFSIGNALED(status))
1834				errx(1, "child pid %d exited on signal %d%s",
1835					pid, WTERMSIG(status),
1836					WCOREDUMP(status) ? " (core dumped)" :
1837					"");
1838			if (pid == childpid)	/* it's gone... */
1839				break;
1840		}
1841		exit(0);
1842	}
1843
1844	if (setsid() == -1)
1845		return (-1);
1846
1847	if (!nochdir)
1848		(void)chdir("/");
1849
1850	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1851		(void)dup2(fd, STDIN_FILENO);
1852		(void)dup2(fd, STDOUT_FILENO);
1853		(void)dup2(fd, STDERR_FILENO);
1854		if (fd > 2)
1855			(void)close (fd);
1856	}
1857	return (getppid());
1858}
1859
1860/*
1861 * We get a SIGALRM from the child when it's running and finished doing it's
1862 * fsync()'s or O_SYNC writes for all the boot messages.
1863 *
1864 * We also get a signal from the kernel if the timer expires, so check to
1865 * see what happened.
1866 */
1867void
1868timedout(sig)
1869	int sig __unused;
1870{
1871	int left;
1872	left = alarm(0);
1873	signal(SIGALRM, SIG_DFL);
1874	if (left == 0)
1875		errx(1, "timed out waiting for child");
1876	else
1877		_exit(0);
1878}
1879
1880/*
1881 * Add `s' to the list of allowable peer addresses to accept messages
1882 * from.
1883 *
1884 * `s' is a string in the form:
1885 *
1886 *    [*]domainname[:{servicename|portnumber|*}]
1887 *
1888 * or
1889 *
1890 *    netaddr/maskbits[:{servicename|portnumber|*}]
1891 *
1892 * Returns -1 on error, 0 if the argument was valid.
1893 */
1894int
1895allowaddr(s)
1896	char *s;
1897{
1898	char *cp1, *cp2;
1899	struct allowedpeer ap;
1900	struct servent *se;
1901	int masklen = -1, i;
1902	struct addrinfo hints, *res;
1903	struct in_addr *addrp, *maskp;
1904	u_int32_t *addr6p, *mask6p;
1905	char ip[NI_MAXHOST];
1906
1907#ifdef INET6
1908	if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
1909#endif
1910		cp1 = s;
1911	if ((cp1 = strrchr(cp1, ':'))) {
1912		/* service/port provided */
1913		*cp1++ = '\0';
1914		if (strlen(cp1) == 1 && *cp1 == '*')
1915			/* any port allowed */
1916			ap.port = 0;
1917		else if ((se = getservbyname(cp1, "udp")))
1918			ap.port = ntohs(se->s_port);
1919		else {
1920			ap.port = strtol(cp1, &cp2, 0);
1921			if (*cp2 != '\0')
1922				return -1; /* port not numeric */
1923		}
1924	} else {
1925		if ((se = getservbyname("syslog", "udp")))
1926			ap.port = ntohs(se->s_port);
1927		else
1928			/* sanity, should not happen */
1929			ap.port = 514;
1930	}
1931
1932	if ((cp1 = strchr(s, '/')) != NULL &&
1933	    strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
1934		*cp1 = '\0';
1935		if ((masklen = atoi(cp1 + 1)) < 0)
1936			return -1;
1937	}
1938#ifdef INET6
1939	if (*s == '[') {
1940		cp2 = s + strlen(s) - 1;
1941		if (*cp2 == ']') {
1942			++s;
1943			*cp2 = '\0';
1944		} else
1945			cp2 = NULL;
1946	} else
1947		cp2 = NULL;
1948#endif
1949	memset(&hints, 0, sizeof(hints));
1950	hints.ai_family = PF_UNSPEC;
1951	hints.ai_socktype = SOCK_DGRAM;
1952	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
1953	if (getaddrinfo(s, NULL, &hints, &res) == 0) {
1954		ap.isnumeric = 1;
1955		memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
1956		memset(&ap.a_mask, 0, sizeof(ap.a_mask));
1957		ap.a_mask.ss_family = res->ai_family;
1958		if (res->ai_family == AF_INET) {
1959			ap.a_mask.ss_len = sizeof(struct sockaddr_in);
1960			maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
1961			addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
1962			if (masklen < 0) {
1963				/* use default netmask */
1964				if (IN_CLASSA(ntohl(addrp->s_addr)))
1965					maskp->s_addr = htonl(IN_CLASSA_NET);
1966				else if (IN_CLASSB(ntohl(addrp->s_addr)))
1967					maskp->s_addr = htonl(IN_CLASSB_NET);
1968				else
1969					maskp->s_addr = htonl(IN_CLASSC_NET);
1970			} else if (masklen <= 32) {
1971				/* convert masklen to netmask */
1972				maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
1973			} else {
1974				freeaddrinfo(res);
1975				return -1;
1976			}
1977			/* Lose any host bits in the network number. */
1978			addrp->s_addr &= maskp->s_addr;
1979		}
1980#ifdef INET6
1981		else if (res->ai_family == AF_INET6 && masklen <= 128) {
1982			ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
1983			if (masklen < 0)
1984				masklen = 128;
1985			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
1986			/* convert masklen to netmask */
1987			while (masklen > 0) {
1988				if (masklen < 32) {
1989					*mask6p = htonl(~(0xffffffff >> masklen));
1990					break;
1991				}
1992				*mask6p++ = 0xffffffff;
1993				masklen -= 32;
1994			}
1995			/* Lose any host bits in the network number. */
1996			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
1997			addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
1998			for (i = 0; i < 4; i++)
1999				addr6p[i] &= mask6p[i];
2000		}
2001#endif
2002		else {
2003			freeaddrinfo(res);
2004			return -1;
2005		}
2006		freeaddrinfo(res);
2007	} else {
2008		/* arg `s' is domain name */
2009		ap.isnumeric = 0;
2010		ap.a_name = s;
2011		if (cp1)
2012			*cp1 = '/';
2013#ifdef INET6
2014		if (cp2) {
2015			*cp2 = ']';
2016			--s;
2017		}
2018#endif
2019	}
2020
2021	if (Debug) {
2022		printf("allowaddr: rule %d: ", NumAllowed);
2023		if (ap.isnumeric) {
2024			printf("numeric, ");
2025			getnameinfo((struct sockaddr *)&ap.a_addr,
2026				    ((struct sockaddr *)&ap.a_addr)->sa_len,
2027				    ip, sizeof ip, NULL, 0,
2028				    NI_NUMERICHOST | withscopeid);
2029			printf("addr = %s, ", ip);
2030			getnameinfo((struct sockaddr *)&ap.a_mask,
2031				    ((struct sockaddr *)&ap.a_mask)->sa_len,
2032				    ip, sizeof ip, NULL, 0,
2033				    NI_NUMERICHOST | withscopeid);
2034			printf("mask = %s; ", ip);
2035		} else
2036			printf("domainname = %s; ", ap.a_name);
2037		printf("port = %d\n", ap.port);
2038	}
2039
2040	if ((AllowedPeers = realloc(AllowedPeers,
2041				    ++NumAllowed * sizeof(struct allowedpeer)))
2042	    == NULL) {
2043		/* XXX should use err()... consistency! */
2044		fprintf(stderr, "Out of memory!\n");
2045		exit(EX_OSERR);
2046	}
2047	memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2048	return 0;
2049}
2050
2051/*
2052 * Validate that the remote peer has permission to log to us.
2053 */
2054int
2055validate(sa, hname)
2056	struct sockaddr *sa;
2057	const char *hname;
2058{
2059	int i, j, reject;
2060	size_t l1, l2;
2061	char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2062	struct allowedpeer *ap;
2063	struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2064	struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2065	struct addrinfo hints, *res;
2066	u_short sport;
2067
2068	if (NumAllowed == 0)
2069		/* traditional behaviour, allow everything */
2070		return 1;
2071
2072	(void)strlcpy(name, hname, sizeof(name));
2073	memset(&hints, 0, sizeof(hints));
2074	hints.ai_family = PF_UNSPEC;
2075	hints.ai_socktype = SOCK_DGRAM;
2076	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2077	if (getaddrinfo(name, NULL, &hints, &res) == 0)
2078		freeaddrinfo(res);
2079	else if (strchr(name, '.') == NULL) {
2080		strlcat(name, ".", sizeof name);
2081		strlcat(name, LocalDomain, sizeof name);
2082	}
2083	if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2084			NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0)
2085		return 0;	/* for safety, should not occur */
2086	dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2087		ip, port, name);
2088	sport = atoi(port);
2089
2090	/* now, walk down the list */
2091	for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2092		if (ap->port != 0 && ap->port != sport) {
2093			dprintf("rejected in rule %d due to port mismatch.\n", i);
2094			continue;
2095		}
2096
2097		if (ap->isnumeric) {
2098			if (ap->a_addr.ss_family != sa->sa_family) {
2099				dprintf("rejected in rule %d due to address family mismatch.\n", i);
2100				continue;
2101			}
2102			if (ap->a_addr.ss_family == AF_INET) {
2103				sin4 = (struct sockaddr_in *)sa;
2104				a4p = (struct sockaddr_in *)&ap->a_addr;
2105				m4p = (struct sockaddr_in *)&ap->a_mask;
2106				if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2107				    != a4p->sin_addr.s_addr) {
2108					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2109					continue;
2110				}
2111			}
2112#ifdef INET6
2113			else if (ap->a_addr.ss_family == AF_INET6) {
2114				sin6 = (struct sockaddr_in6 *)sa;
2115				a6p = (struct sockaddr_in6 *)&ap->a_addr;
2116				m6p = (struct sockaddr_in6 *)&ap->a_mask;
2117#ifdef NI_WITHSCOPEID
2118				if (a6p->sin6_scope_id != 0 &&
2119				    sin6->sin6_scope_id != a6p->sin6_scope_id) {
2120					dprintf("rejected in rule %d due to scope mismatch.\n", i);
2121					continue;
2122				}
2123#endif
2124				reject = 0;
2125				for (j = 0; j < 16; j += 4) {
2126					if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2127					    != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2128						++reject;
2129						break;
2130					}
2131				}
2132				if (reject) {
2133					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2134					continue;
2135				}
2136			}
2137#endif
2138			else
2139				continue;
2140		} else {
2141			cp = ap->a_name;
2142			l1 = strlen(name);
2143			if (*cp == '*') {
2144				/* allow wildmatch */
2145				cp++;
2146				l2 = strlen(cp);
2147				if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2148					dprintf("rejected in rule %d due to name mismatch.\n", i);
2149					continue;
2150				}
2151			} else {
2152				/* exact match */
2153				l2 = strlen(cp);
2154				if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2155					dprintf("rejected in rule %d due to name mismatch.\n", i);
2156					continue;
2157				}
2158			}
2159		}
2160		dprintf("accepted in rule %d.\n", i);
2161		return 1;	/* hooray! */
2162	}
2163	return 0;
2164}
2165
2166/*
2167 * Fairly similar to popen(3), but returns an open descriptor, as
2168 * opposed to a FILE *.
2169 */
2170int
2171p_open(prog, pid)
2172	const char *prog;
2173	pid_t *pid;
2174{
2175	int pfd[2], nulldesc, i;
2176	sigset_t omask, mask;
2177	char *argv[4]; /* sh -c cmd NULL */
2178	char errmsg[200];
2179
2180	if (pipe(pfd) == -1)
2181		return -1;
2182	if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2183		/* we are royally screwed anyway */
2184		return -1;
2185
2186	sigemptyset(&mask);
2187	sigaddset(&mask, SIGALRM);
2188	sigaddset(&mask, SIGHUP);
2189	sigprocmask(SIG_BLOCK, &mask, &omask);
2190	switch ((*pid = fork())) {
2191	case -1:
2192		sigprocmask(SIG_SETMASK, &omask, 0);
2193		close(nulldesc);
2194		return -1;
2195
2196	case 0:
2197		/* XXX should check for NULL return */
2198		argv[0] = strdup("sh");
2199		argv[1] = strdup("-c");
2200		argv[2] = strdup(prog);
2201		argv[3] = NULL;
2202
2203		alarm(0);
2204		(void)setsid();	/* Avoid catching SIGHUPs. */
2205
2206		/*
2207		 * Throw away pending signals, and reset signal
2208		 * behaviour to standard values.
2209		 */
2210		signal(SIGALRM, SIG_IGN);
2211		signal(SIGHUP, SIG_IGN);
2212		sigprocmask(SIG_SETMASK, &omask, 0);
2213		signal(SIGPIPE, SIG_DFL);
2214		signal(SIGQUIT, SIG_DFL);
2215		signal(SIGALRM, SIG_DFL);
2216		signal(SIGHUP, SIG_DFL);
2217
2218		dup2(pfd[0], STDIN_FILENO);
2219		dup2(nulldesc, STDOUT_FILENO);
2220		dup2(nulldesc, STDERR_FILENO);
2221		for (i = getdtablesize(); i > 2; i--)
2222			(void) close(i);
2223
2224		(void) execvp(_PATH_BSHELL, argv);
2225		_exit(255);
2226	}
2227
2228	sigprocmask(SIG_SETMASK, &omask, 0);
2229	close(nulldesc);
2230	close(pfd[0]);
2231	/*
2232	 * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
2233	 * supposed to get an EWOULDBLOCK on writev(2), which is
2234	 * caught by the logic above anyway, which will in turn close
2235	 * the pipe, and fork a new logging subprocess if necessary.
2236	 * The stale subprocess will be killed some time later unless
2237	 * it terminated itself due to closing its input pipe (so we
2238	 * get rid of really dead puppies).
2239	 */
2240	if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2241		/* This is bad. */
2242		(void)snprintf(errmsg, sizeof errmsg,
2243			       "Warning: cannot change pipe to PID %d to "
2244			       "non-blocking behaviour.",
2245			       (int)*pid);
2246		logerror(errmsg);
2247	}
2248	return pfd[1];
2249}
2250
2251void
2252deadq_enter(pid, name)
2253	pid_t pid;
2254	const char *name;
2255{
2256	dq_t p;
2257	int status;
2258
2259	/*
2260	 * Be paranoid, if we can't signal the process, don't enter it
2261	 * into the dead queue (perhaps it's already dead).  If possible,
2262	 * we try to fetch and log the child's status.
2263	 */
2264	if (kill(pid, 0) != 0) {
2265		if (waitpid(pid, &status, WNOHANG) > 0)
2266			log_deadchild(pid, status, name);
2267		return;
2268	}
2269
2270	p = malloc(sizeof(struct deadq_entry));
2271	if (p == NULL) {
2272		errno = 0; /* XXX why?  isn't ENOMEM good enough? */
2273		logerror("panic: out of virtual memory!");
2274		exit(1);
2275	}
2276
2277	p->dq_pid = pid;
2278	p->dq_timeout = DQ_TIMO_INIT;
2279	TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2280}
2281
2282int
2283deadq_remove(pid)
2284	pid_t pid;
2285{
2286	dq_t q;
2287
2288	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
2289		if (q->dq_pid == pid) {
2290			TAILQ_REMOVE(&deadq_head, q, dq_entries);
2291				free(q);
2292				return 1;
2293		}
2294
2295	return 0;
2296}
2297
2298void
2299log_deadchild(pid, status, name)
2300	pid_t pid;
2301	int status;
2302	const char *name;
2303{
2304	int code;
2305	char buf[256];
2306	const char *reason;
2307
2308	errno = 0; /* Keep strerror() stuff out of logerror messages. */
2309	if (WIFSIGNALED(status)) {
2310		reason = "due to signal";
2311		code = WTERMSIG(status);
2312	} else {
2313		reason = "with status";
2314		code = WEXITSTATUS(status);
2315		if (code == 0)
2316			return;
2317	}
2318	(void)snprintf(buf, sizeof buf,
2319		       "Logging subprocess %d (%s) exited %s %d.",
2320		       pid, name, reason, code);
2321	logerror(buf);
2322}
2323
2324int *
2325socksetup(af, bindhostname)
2326	int af;
2327	const char *bindhostname;
2328{
2329	struct addrinfo hints, *res, *r;
2330	int error, maxs, *s, *socks;
2331
2332	memset(&hints, 0, sizeof(hints));
2333	hints.ai_flags = AI_PASSIVE;
2334	hints.ai_family = af;
2335	hints.ai_socktype = SOCK_DGRAM;
2336	error = getaddrinfo(bindhostname, "syslog", &hints, &res);
2337	if (error) {
2338		logerror(gai_strerror(error));
2339		errno = 0;
2340		die(0);
2341	}
2342
2343	/* Count max number of sockets we may open */
2344	for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2345	socks = malloc((maxs+1) * sizeof(int));
2346	if (socks == NULL) {
2347		logerror("couldn't allocate memory for sockets");
2348		die(0);
2349	}
2350
2351	*socks = 0;   /* num of sockets counter at start of array */
2352	s = socks + 1;
2353	for (r = res; r; r = r->ai_next) {
2354		*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2355		if (*s < 0) {
2356			logerror("socket");
2357			continue;
2358		}
2359#ifdef IPV6_BINDV6ONLY
2360		if (r->ai_family == AF_INET6) {
2361			int on = 1;
2362			if (setsockopt(*s, IPPROTO_IPV6, IPV6_BINDV6ONLY,
2363				       (char *)&on, sizeof (on)) < 0) {
2364				logerror("setsockopt");
2365				close(*s);
2366				continue;
2367			}
2368		}
2369#endif
2370		if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2371			close(*s);
2372			logerror("bind");
2373			continue;
2374		}
2375
2376		(*socks)++;
2377		s++;
2378	}
2379
2380	if (*socks == 0) {
2381		free(socks);
2382		if (Debug)
2383			return(NULL);
2384		else
2385			die(0);
2386	}
2387	if (res)
2388		freeaddrinfo(res);
2389
2390	return(socks);
2391}
2392