xref: /freebsd/usr.sbin/syslogd/syslogd.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
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  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #ifndef lint
31 static const char copyright[] =
32 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\
33 	The Regents of the University of California.  All rights reserved.\n";
34 #endif /* not lint */
35 
36 #ifndef lint
37 #if 0
38 static char sccsid[] = "@(#)syslogd.c	8.3 (Berkeley) 4/4/94";
39 #endif
40 #endif /* not lint */
41 
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
44 
45 /*
46  *  syslogd -- log system messages
47  *
48  * This program implements a system log. It takes a series of lines.
49  * Each line may have a priority, signified as "<n>" as
50  * the first characters of the line.  If this is
51  * not present, a default priority is used.
52  *
53  * To kill syslogd, send a signal 15 (terminate).  A signal 1 (hup) will
54  * cause it to reread its configuration file.
55  *
56  * Defined Constants:
57  *
58  * MAXLINE -- the maximum line length that can be handled.
59  * DEFUPRI -- the default priority for user messages
60  * DEFSPRI -- the default priority for kernel messages
61  *
62  * Author: Eric Allman
63  * extensive changes by Ralph Campbell
64  * more extensive changes by Eric Allman (again)
65  * Extension to log by program name as well as facility and priority
66  *   by Peter da Silva.
67  * -u and -v by Harlan Stenn.
68  * Priority comparison code by Harlan Stenn.
69  */
70 
71 #define	MAXLINE		1024		/* maximum line length */
72 #define	MAXSVLINE	120		/* maximum saved line length */
73 #define	DEFUPRI		(LOG_USER|LOG_NOTICE)
74 #define	DEFSPRI		(LOG_KERN|LOG_CRIT)
75 #define	TIMERINTVL	30		/* interval for checking flush, mark */
76 #define	TTYMSGTIME	1		/* timeout passed to ttymsg */
77 
78 #include <sys/param.h>
79 #include <sys/ioctl.h>
80 #include <sys/stat.h>
81 #include <sys/wait.h>
82 #include <sys/socket.h>
83 #include <sys/queue.h>
84 #include <sys/uio.h>
85 #include <sys/un.h>
86 #include <sys/time.h>
87 #include <sys/resource.h>
88 #include <sys/syslimits.h>
89 #include <sys/types.h>
90 
91 #include <netinet/in.h>
92 #include <netdb.h>
93 #include <arpa/inet.h>
94 
95 #include <ctype.h>
96 #include <err.h>
97 #include <errno.h>
98 #include <fcntl.h>
99 #include <libutil.h>
100 #include <limits.h>
101 #include <paths.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 const char	*ConfFile = _PATH_LOGCONF;
117 const char	*PidFile = _PATH_LOGPID;
118 const char	ctty[] = _PATH_CONSOLE;
119 
120 #define	dprintf		if (Debug) printf
121 
122 #define	MAXUNAMES	20	/* maximum number of user names */
123 
124 /*
125  * Unix sockets.
126  * We have two default sockets, one with 666 permissions,
127  * and one for privileged programs.
128  */
129 struct funix {
130 	int			s;
131 	char			*name;
132 	mode_t			mode;
133 	STAILQ_ENTRY(funix)	next;
134 };
135 struct funix funix_secure =	{ -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
136 				{ NULL } };
137 struct funix funix_default =	{ -1, _PATH_LOG, DEFFILEMODE,
138 				{ &funix_secure } };
139 
140 STAILQ_HEAD(, funix) funixes =	{ &funix_default,
141 				&(funix_secure.next.stqe_next) };
142 
143 /*
144  * Flags to logmsg().
145  */
146 
147 #define	IGN_CONS	0x001	/* don't print on console */
148 #define	SYNC_FILE	0x002	/* do fsync on file after printing */
149 #define	ADDDATE		0x004	/* add a date to the message */
150 #define	MARK		0x008	/* this message is a mark */
151 #define	ISKERNEL	0x010	/* kernel generated message */
152 
153 /*
154  * This structure represents the files that will have log
155  * copies printed.
156  * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
157  * or if f_type if F_PIPE and f_pid > 0.
158  */
159 
160 struct filed {
161 	struct	filed *f_next;		/* next in linked list */
162 	short	f_type;			/* entry type, see below */
163 	short	f_file;			/* file descriptor */
164 	time_t	f_time;			/* time this was last written */
165 	char	*f_host;		/* host from which to recd. */
166 	u_char	f_pmask[LOG_NFACILITIES+1];	/* priority mask */
167 	u_char	f_pcmp[LOG_NFACILITIES+1];	/* compare priority */
168 #define PRI_LT	0x1
169 #define PRI_EQ	0x2
170 #define PRI_GT	0x4
171 	char	*f_program;		/* program this applies to */
172 	union {
173 		char	f_uname[MAXUNAMES][UT_NAMESIZE+1];
174 		struct {
175 			char	f_hname[MAXHOSTNAMELEN];
176 			struct addrinfo *f_addr;
177 
178 		} f_forw;		/* forwarding address */
179 		char	f_fname[MAXPATHLEN];
180 		struct {
181 			char	f_pname[MAXPATHLEN];
182 			pid_t	f_pid;
183 		} f_pipe;
184 	} f_un;
185 	char	f_prevline[MAXSVLINE];		/* last message logged */
186 	char	f_lasttime[16];			/* time of last occurrence */
187 	char	f_prevhost[MAXHOSTNAMELEN];	/* host from which recd. */
188 	int	f_prevpri;			/* pri of f_prevline */
189 	int	f_prevlen;			/* length of f_prevline */
190 	int	f_prevcount;			/* repetition cnt of prevline */
191 	u_int	f_repeatcount;			/* number of "repeated" msgs */
192 	int	f_flags;			/* file-specific flags */
193 #define	FFLAG_SYNC 0x01
194 #define	FFLAG_NEEDSYNC	0x02
195 };
196 
197 /*
198  * Queue of about-to-be dead processes we should watch out for.
199  */
200 
201 TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
202 struct stailhead *deadq_headp;
203 
204 struct deadq_entry {
205 	pid_t				dq_pid;
206 	int				dq_timeout;
207 	TAILQ_ENTRY(deadq_entry)	dq_entries;
208 };
209 
210 /*
211  * The timeout to apply to processes waiting on the dead queue.  Unit
212  * of measure is `mark intervals', i.e. 20 minutes by default.
213  * Processes on the dead queue will be terminated after that time.
214  */
215 
216 #define	 DQ_TIMO_INIT	2
217 
218 typedef struct deadq_entry *dq_t;
219 
220 
221 /*
222  * Struct to hold records of network addresses that are allowed to log
223  * to us.
224  */
225 struct allowedpeer {
226 	int isnumeric;
227 	u_short port;
228 	union {
229 		struct {
230 			struct sockaddr_storage addr;
231 			struct sockaddr_storage mask;
232 		} numeric;
233 		char *name;
234 	} u;
235 #define a_addr u.numeric.addr
236 #define a_mask u.numeric.mask
237 #define a_name u.name
238 };
239 
240 
241 /*
242  * Intervals at which we flush out "message repeated" messages,
243  * in seconds after previous message is logged.  After each flush,
244  * we move to the next interval until we reach the largest.
245  */
246 int	repeatinterval[] = { 30, 120, 600 };	/* # of secs before flush */
247 #define	MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
248 #define	REPEATTIME(f)	((f)->f_time + repeatinterval[(f)->f_repeatcount])
249 #define	BACKOFF(f)	{ if (++(f)->f_repeatcount > MAXREPEAT) \
250 				 (f)->f_repeatcount = MAXREPEAT; \
251 			}
252 
253 /* values for f_type */
254 #define F_UNUSED	0		/* unused entry */
255 #define F_FILE		1		/* regular file */
256 #define F_TTY		2		/* terminal */
257 #define F_CONSOLE	3		/* console terminal */
258 #define F_FORW		4		/* remote machine */
259 #define F_USERS		5		/* list of users */
260 #define F_WALL		6		/* everyone logged on */
261 #define F_PIPE		7		/* pipe to program */
262 
263 const char *TypeNames[8] = {
264 	"UNUSED",	"FILE",		"TTY",		"CONSOLE",
265 	"FORW",		"USERS",	"WALL",		"PIPE"
266 };
267 
268 static struct filed *Files;	/* Log files that we write to */
269 static struct filed consfile;	/* Console */
270 
271 static int	Debug;		/* debug flag */
272 static int	resolve = 1;	/* resolve hostname */
273 static char	LocalHostName[MAXHOSTNAMELEN];	/* our hostname */
274 static const char *LocalDomain;	/* our local domain name */
275 static int	*finet;		/* Internet datagram socket */
276 static int	fklog = -1;	/* /dev/klog */
277 static int	Initialized;	/* set when we have initialized ourselves */
278 static int	MarkInterval = 20 * 60;	/* interval between marks in seconds */
279 static int	MarkSeq;	/* mark sequence number */
280 static int	SecureMode;	/* when true, receive only unix domain socks */
281 #ifdef INET6
282 static int	family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
283 #else
284 static int	family = PF_INET; /* protocol family (IPv4 only) */
285 #endif
286 static int	send_to_all;	/* send message to all IPv4/IPv6 addresses */
287 static int	use_bootfile;	/* log entire bootfile for every kern msg */
288 static int	no_compress;	/* don't compress messages (1=pipes, 2=all) */
289 static int	logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
290 
291 static char	bootfile[MAXLINE+1]; /* booted kernel file */
292 
293 struct allowedpeer *AllowedPeers; /* List of allowed peers */
294 static int	NumAllowed;	/* Number of entries in AllowedPeers */
295 
296 static int	UniquePriority;	/* Only log specified priority? */
297 static int	LogFacPri;	/* Put facility and priority in log message: */
298 				/* 0=no, 1=numeric, 2=names */
299 static int	KeepKernFac;	/* Keep remotely logged kernel facility */
300 static int	needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
301 static struct pidfh *pfh;
302 
303 volatile sig_atomic_t MarkSet, WantDie;
304 
305 static int	allowaddr(char *);
306 static void	cfline(const char *, struct filed *,
307 		    const char *, const char *);
308 static const char *cvthname(struct sockaddr *);
309 static void	deadq_enter(pid_t, const char *);
310 static int	deadq_remove(pid_t);
311 static int	decode(const char *, CODE *);
312 static void	die(int);
313 static void	dodie(int);
314 static void	dofsync(void);
315 static void	domark(int);
316 static void	fprintlog(struct filed *, int, const char *);
317 static int	*socksetup(int, const char *);
318 static void	init(int);
319 static void	logerror(const char *);
320 static void	logmsg(int, const char *, const char *, int);
321 static void	log_deadchild(pid_t, int, const char *);
322 static void	markit(void);
323 static int	skip_message(const char *, const char *, int);
324 static void	printline(const char *, char *);
325 static void	printsys(char *);
326 static int	p_open(const char *, pid_t *);
327 static void	readklog(void);
328 static void	reapchild(int);
329 static void	usage(void);
330 static int	validate(struct sockaddr *, const char *);
331 static void	unmapped(struct sockaddr *);
332 static void	wallmsg(struct filed *, struct iovec *);
333 static int	waitdaemon(int, int, int);
334 static void	timedout(int);
335 static void	double_rbuf(int);
336 
337 int
338 main(int argc, char *argv[])
339 {
340 	int ch, i, fdsrmax = 0, l;
341 	struct sockaddr_un sunx, fromunix;
342 	struct sockaddr_storage frominet;
343 	fd_set *fdsr = NULL;
344 	char line[MAXLINE + 1];
345 	const char *bindhostname, *hname;
346 	struct timeval tv, *tvp;
347 	struct sigaction sact;
348 	struct funix *fx, *fx1;
349 	sigset_t mask;
350 	pid_t ppid = 1, spid;
351 	socklen_t len;
352 
353 	bindhostname = NULL;
354 	while ((ch = getopt(argc, argv, "46Aa:b:cCdf:kl:m:nop:P:sS:uv")) != -1)
355 		switch (ch) {
356 		case '4':
357 			family = PF_INET;
358 			break;
359 #ifdef INET6
360 		case '6':
361 			family = PF_INET6;
362 			break;
363 #endif
364 		case 'A':
365 			send_to_all++;
366 			break;
367 		case 'a':		/* allow specific network addresses only */
368 			if (allowaddr(optarg) == -1)
369 				usage();
370 			break;
371 		case 'b':
372 			bindhostname = optarg;
373 			break;
374 		case 'c':
375 			no_compress++;
376 			break;
377 		case 'C':
378 			logflags |= O_CREAT;
379 			break;
380 		case 'd':		/* debug */
381 			Debug++;
382 			break;
383 		case 'f':		/* configuration file */
384 			ConfFile = optarg;
385 			break;
386 		case 'k':		/* keep remote kern fac */
387 			KeepKernFac = 1;
388 			break;
389 		case 'l':
390 		    {
391 			long	perml;
392 			mode_t	mode;
393 			char	*name, *ep;
394 
395 			if (optarg[0] == '/') {
396 				mode = DEFFILEMODE;
397 				name = optarg;
398 			} else if ((name = strchr(optarg, ':')) != NULL) {
399 				*name++ = '\0';
400 				if (name[0] != '/')
401 					errx(1, "socket name must be absolute "
402 					    "path");
403 				if (isdigit(*optarg)) {
404 					perml = strtol(optarg, &ep, 8);
405 				    if (*ep || perml < 0 ||
406 					perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
407 					    errx(1, "invalid mode %s, exiting",
408 						optarg);
409 				    mode = (mode_t )perml;
410 				} else
411 					errx(1, "invalid mode %s, exiting",
412 					    optarg);
413 			} else	/* doesn't begin with '/', and no ':' */
414 				errx(1, "can't parse path %s", optarg);
415 
416 			if (strlen(name) >= sizeof(sunx.sun_path))
417 				errx(1, "%s path too long, exiting", name);
418 			if ((fx = malloc(sizeof(struct funix))) == NULL)
419 				errx(1, "malloc failed");
420 			fx->s = -1;
421 			fx->name = name;
422 			fx->mode = mode;
423 			STAILQ_INSERT_TAIL(&funixes, fx, next);
424 			break;
425 		   }
426 		case 'm':		/* mark interval */
427 			MarkInterval = atoi(optarg) * 60;
428 			break;
429 		case 'n':
430 			resolve = 0;
431 			break;
432 		case 'o':
433 			use_bootfile = 1;
434 			break;
435 		case 'p':		/* path */
436 			if (strlen(optarg) >= sizeof(sunx.sun_path))
437 				errx(1, "%s path too long, exiting", optarg);
438 			funix_default.name = optarg;
439 			break;
440 		case 'P':		/* path for alt. PID */
441 			PidFile = optarg;
442 			break;
443 		case 's':		/* no network mode */
444 			SecureMode++;
445 			break;
446 		case 'S':		/* path for privileged originator */
447 			if (strlen(optarg) >= sizeof(sunx.sun_path))
448 				errx(1, "%s path too long, exiting", optarg);
449 			funix_secure.name = optarg;
450 			break;
451 		case 'u':		/* only log specified priority */
452 			UniquePriority++;
453 			break;
454 		case 'v':		/* log facility and priority */
455 		  	LogFacPri++;
456 			break;
457 		default:
458 			usage();
459 		}
460 	if ((argc -= optind) != 0)
461 		usage();
462 
463 	pfh = pidfile_open(PidFile, 0600, &spid);
464 	if (pfh == NULL) {
465 		if (errno == EEXIST)
466 			errx(1, "syslogd already running, pid: %d", spid);
467 		warn("cannot open pid file");
468 	}
469 
470 	if (!Debug) {
471 		ppid = waitdaemon(0, 0, 30);
472 		if (ppid < 0) {
473 			warn("could not become daemon");
474 			pidfile_remove(pfh);
475 			exit(1);
476 		}
477 	} else {
478 		setlinebuf(stdout);
479 	}
480 
481 	if (NumAllowed)
482 		endservent();
483 
484 	consfile.f_type = F_CONSOLE;
485 	(void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
486 	    sizeof(consfile.f_un.f_fname));
487 	(void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
488 	(void)signal(SIGTERM, dodie);
489 	(void)signal(SIGINT, Debug ? dodie : SIG_IGN);
490 	(void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
491 	/*
492 	 * We don't want the SIGCHLD and SIGHUP handlers to interfere
493 	 * with each other; they are likely candidates for being called
494 	 * simultaneously (SIGHUP closes pipe descriptor, process dies,
495 	 * SIGCHLD happens).
496 	 */
497 	sigemptyset(&mask);
498 	sigaddset(&mask, SIGHUP);
499 	sact.sa_handler = reapchild;
500 	sact.sa_mask = mask;
501 	sact.sa_flags = SA_RESTART;
502 	(void)sigaction(SIGCHLD, &sact, NULL);
503 	(void)signal(SIGALRM, domark);
504 	(void)signal(SIGPIPE, SIG_IGN);	/* We'll catch EPIPE instead. */
505 	(void)alarm(TIMERINTVL);
506 
507 	TAILQ_INIT(&deadq_head);
508 
509 #ifndef SUN_LEN
510 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
511 #endif
512 	STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) {
513 		(void)unlink(fx->name);
514 		memset(&sunx, 0, sizeof(sunx));
515 		sunx.sun_family = AF_UNIX;
516 		(void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path));
517 		fx->s = socket(AF_UNIX, SOCK_DGRAM, 0);
518 		if (fx->s < 0 ||
519 		    bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
520 		    chmod(fx->name, fx->mode) < 0) {
521 			(void)snprintf(line, sizeof line,
522 					"cannot create %s", fx->name);
523 			logerror(line);
524 			dprintf("cannot create %s (%d)\n", fx->name, errno);
525 			if (fx == &funix_default || fx == &funix_secure)
526 				die(0);
527 			else {
528 				STAILQ_REMOVE(&funixes, fx, funix, next);
529 				continue;
530 			}
531 			double_rbuf(fx->s);
532 		}
533 	}
534 	if (SecureMode <= 1)
535 		finet = socksetup(family, bindhostname);
536 
537 	if (finet) {
538 		if (SecureMode) {
539 			for (i = 0; i < *finet; i++) {
540 				if (shutdown(finet[i+1], SHUT_RD) < 0) {
541 					logerror("shutdown");
542 					if (!Debug)
543 						die(0);
544 				}
545 			}
546 		} else {
547 			dprintf("listening on inet and/or inet6 socket\n");
548 		}
549 		dprintf("sending on inet and/or inet6 socket\n");
550 	}
551 
552 	if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
553 		if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
554 			fklog = -1;
555 	if (fklog < 0)
556 		dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
557 
558 	/* tuck my process id away */
559 	pidfile_write(pfh);
560 
561 	dprintf("off & running....\n");
562 
563 	init(0);
564 	/* prevent SIGHUP and SIGCHLD handlers from running in parallel */
565 	sigemptyset(&mask);
566 	sigaddset(&mask, SIGCHLD);
567 	sact.sa_handler = init;
568 	sact.sa_mask = mask;
569 	sact.sa_flags = SA_RESTART;
570 	(void)sigaction(SIGHUP, &sact, NULL);
571 
572 	tvp = &tv;
573 	tv.tv_sec = tv.tv_usec = 0;
574 
575 	if (fklog != -1 && fklog > fdsrmax)
576 		fdsrmax = fklog;
577 	if (finet && !SecureMode) {
578 		for (i = 0; i < *finet; i++) {
579 		    if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
580 			fdsrmax = finet[i+1];
581 		}
582 	}
583 	STAILQ_FOREACH(fx, &funixes, next)
584 		if (fx->s > fdsrmax)
585 			fdsrmax = fx->s;
586 
587 	fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
588 	    sizeof(fd_mask));
589 	if (fdsr == NULL)
590 		errx(1, "calloc fd_set");
591 
592 	for (;;) {
593 		if (MarkSet)
594 			markit();
595 		if (WantDie)
596 			die(WantDie);
597 
598 		bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
599 		    sizeof(fd_mask));
600 
601 		if (fklog != -1)
602 			FD_SET(fklog, fdsr);
603 		if (finet && !SecureMode) {
604 			for (i = 0; i < *finet; i++) {
605 				if (finet[i+1] != -1)
606 					FD_SET(finet[i+1], fdsr);
607 			}
608 		}
609 		STAILQ_FOREACH(fx, &funixes, next)
610 			FD_SET(fx->s, fdsr);
611 
612 		i = select(fdsrmax+1, fdsr, NULL, NULL,
613 		    needdofsync ? &tv : tvp);
614 		switch (i) {
615 		case 0:
616 			dofsync();
617 			needdofsync = 0;
618 			if (tvp) {
619 				tvp = NULL;
620 				if (ppid != 1)
621 					kill(ppid, SIGALRM);
622 			}
623 			continue;
624 		case -1:
625 			if (errno != EINTR)
626 				logerror("select");
627 			continue;
628 		}
629 		if (fklog != -1 && FD_ISSET(fklog, fdsr))
630 			readklog();
631 		if (finet && !SecureMode) {
632 			for (i = 0; i < *finet; i++) {
633 				if (FD_ISSET(finet[i+1], fdsr)) {
634 					len = sizeof(frominet);
635 					l = recvfrom(finet[i+1], line, MAXLINE,
636 					     0, (struct sockaddr *)&frominet,
637 					     &len);
638 					if (l > 0) {
639 						line[l] = '\0';
640 						hname = cvthname((struct sockaddr *)&frominet);
641 						unmapped((struct sockaddr *)&frominet);
642 						if (validate((struct sockaddr *)&frominet, hname))
643 							printline(hname, line);
644 					} else if (l < 0 && errno != EINTR)
645 						logerror("recvfrom inet");
646 				}
647 			}
648 		}
649 		STAILQ_FOREACH(fx, &funixes, next) {
650 			if (FD_ISSET(fx->s, fdsr)) {
651 				len = sizeof(fromunix);
652 				l = recvfrom(fx->s, line, MAXLINE, 0,
653 				    (struct sockaddr *)&fromunix, &len);
654 				if (l > 0) {
655 					line[l] = '\0';
656 					printline(LocalHostName, line);
657 				} else if (l < 0 && errno != EINTR)
658 					logerror("recvfrom unix");
659 			}
660 		}
661 	}
662 	if (fdsr)
663 		free(fdsr);
664 }
665 
666 static void
667 unmapped(struct sockaddr *sa)
668 {
669 	struct sockaddr_in6 *sin6;
670 	struct sockaddr_in sin4;
671 
672 	if (sa->sa_family != AF_INET6)
673 		return;
674 	if (sa->sa_len != sizeof(struct sockaddr_in6) ||
675 	    sizeof(sin4) > sa->sa_len)
676 		return;
677 	sin6 = (struct sockaddr_in6 *)sa;
678 	if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
679 		return;
680 
681 	memset(&sin4, 0, sizeof(sin4));
682 	sin4.sin_family = AF_INET;
683 	sin4.sin_len = sizeof(struct sockaddr_in);
684 	memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
685 	       sizeof(sin4.sin_addr));
686 	sin4.sin_port = sin6->sin6_port;
687 
688 	memcpy(sa, &sin4, sin4.sin_len);
689 }
690 
691 static void
692 usage(void)
693 {
694 
695 	fprintf(stderr, "%s\n%s\n%s\n%s\n",
696 		"usage: syslogd [-46ACcdknosuv] [-a allowed_peer]",
697 		"               [-b bind_address] [-f config_file]",
698 		"               [-l [mode:]path] [-m mark_interval]",
699 		"               [-P pid_file] [-p log_socket]");
700 	exit(1);
701 }
702 
703 /*
704  * Take a raw input line, decode the message, and print the message
705  * on the appropriate log files.
706  */
707 static void
708 printline(const char *hname, char *msg)
709 {
710 	char *p, *q;
711 	long n;
712 	int c, pri;
713 	char line[MAXLINE + 1];
714 
715 	/* test for special codes */
716 	p = msg;
717 	pri = DEFUPRI;
718 	if (*p == '<') {
719 		errno = 0;
720 		n = strtol(p + 1, &q, 10);
721 		if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
722 			p = q + 1;
723 			pri = n;
724 		}
725 	}
726 	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
727 		pri = DEFUPRI;
728 
729 	/*
730 	 * Don't allow users to log kernel messages.
731 	 * NOTE: since LOG_KERN == 0 this will also match
732 	 *       messages with no facility specified.
733 	 */
734 	if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
735 		pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
736 
737 	q = line;
738 
739 	while ((c = (unsigned char)*p++) != '\0' &&
740 	    q < &line[sizeof(line) - 4]) {
741 		if ((c & 0x80) && c < 0xA0) {
742 			c &= 0x7F;
743 			*q++ = 'M';
744 			*q++ = '-';
745 		}
746 		if (isascii(c) && iscntrl(c)) {
747 			if (c == '\n') {
748 				*q++ = ' ';
749 			} else if (c == '\t') {
750 				*q++ = '\t';
751 			} else {
752 				*q++ = '^';
753 				*q++ = c ^ 0100;
754 			}
755 		} else {
756 			*q++ = c;
757 		}
758 	}
759 	*q = '\0';
760 
761 	logmsg(pri, line, hname, 0);
762 }
763 
764 /*
765  * Read /dev/klog while data are available, split into lines.
766  */
767 static void
768 readklog(void)
769 {
770 	char *p, *q, line[MAXLINE + 1];
771 	int len, i;
772 
773 	len = 0;
774 	for (;;) {
775 		i = read(fklog, line + len, MAXLINE - 1 - len);
776 		if (i > 0) {
777 			line[i + len] = '\0';
778 		} else {
779 			if (i < 0 && errno != EINTR && errno != EAGAIN) {
780 				logerror("klog");
781 				fklog = -1;
782 			}
783 			break;
784 		}
785 
786 		for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
787 			*q = '\0';
788 			printsys(p);
789 		}
790 		len = strlen(p);
791 		if (len >= MAXLINE - 1) {
792 			printsys(p);
793 			len = 0;
794 		}
795 		if (len > 0)
796 			memmove(line, p, len + 1);
797 	}
798 	if (len > 0)
799 		printsys(line);
800 }
801 
802 /*
803  * Take a raw input line from /dev/klog, format similar to syslog().
804  */
805 static void
806 printsys(char *msg)
807 {
808 	char *p, *q;
809 	long n;
810 	int flags, isprintf, pri;
811 
812 	flags = ISKERNEL | SYNC_FILE | ADDDATE;	/* fsync after write */
813 	p = msg;
814 	pri = DEFSPRI;
815 	isprintf = 1;
816 	if (*p == '<') {
817 		errno = 0;
818 		n = strtol(p + 1, &q, 10);
819 		if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
820 			p = q + 1;
821 			pri = n;
822 			isprintf = 0;
823 		}
824 	}
825 	/*
826 	 * Kernel printf's and LOG_CONSOLE messages have been displayed
827 	 * on the console already.
828 	 */
829 	if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
830 		flags |= IGN_CONS;
831 	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
832 		pri = DEFSPRI;
833 	logmsg(pri, p, LocalHostName, flags);
834 }
835 
836 static time_t	now;
837 
838 /*
839  * Match a program or host name against a specification.
840  * Return a non-0 value if the message must be ignored
841  * based on the specification.
842  */
843 static int
844 skip_message(const char *name, const char *spec, int checkcase)
845 {
846 	const char *s;
847 	char prev, next;
848 	int exclude = 0;
849 	/* Behaviour on explicit match */
850 
851 	if (spec == NULL)
852 		return 0;
853 	switch (*spec) {
854 	case '-':
855 		exclude = 1;
856 		/*FALLTHROUGH*/
857 	case '+':
858 		spec++;
859 		break;
860 	default:
861 		break;
862 	}
863 	if (checkcase)
864 		s = strstr (spec, name);
865 	else
866 		s = strcasestr (spec, name);
867 
868 	if (s != NULL) {
869 		prev = (s == spec ? ',' : *(s - 1));
870 		next = *(s + strlen (name));
871 
872 		if (prev == ',' && (next == '\0' || next == ','))
873 			/* Explicit match: skip iff the spec is an
874 			   exclusive one. */
875 			return exclude;
876 	}
877 
878 	/* No explicit match for this name: skip the message iff
879 	   the spec is an inclusive one. */
880 	return !exclude;
881 }
882 
883 /*
884  * Log a message to the appropriate log files, users, etc. based on
885  * the priority.
886  */
887 static void
888 logmsg(int pri, const char *msg, const char *from, int flags)
889 {
890 	struct filed *f;
891 	int i, fac, msglen, omask, prilev;
892 	const char *timestamp;
893  	char prog[NAME_MAX+1];
894 	char buf[MAXLINE+1];
895 
896 	dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
897 	    pri, flags, from, msg);
898 
899 	omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
900 
901 	/*
902 	 * Check to see if msg looks non-standard.
903 	 */
904 	msglen = strlen(msg);
905 	if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
906 	    msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
907 		flags |= ADDDATE;
908 
909 	(void)time(&now);
910 	if (flags & ADDDATE) {
911 		timestamp = ctime(&now) + 4;
912 	} else {
913 		timestamp = msg;
914 		msg += 16;
915 		msglen -= 16;
916 	}
917 
918 	/* skip leading blanks */
919 	while (isspace(*msg)) {
920 		msg++;
921 		msglen--;
922 	}
923 
924 	/* extract facility and priority level */
925 	if (flags & MARK)
926 		fac = LOG_NFACILITIES;
927 	else
928 		fac = LOG_FAC(pri);
929 
930 	/* Check maximum facility number. */
931 	if (fac > LOG_NFACILITIES) {
932 		(void)sigsetmask(omask);
933 		return;
934 	}
935 
936 	prilev = LOG_PRI(pri);
937 
938 	/* extract program name */
939 	for (i = 0; i < NAME_MAX; i++) {
940 		if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
941 		    msg[i] == '/' || isspace(msg[i]))
942 			break;
943 		prog[i] = msg[i];
944 	}
945 	prog[i] = 0;
946 
947 	/* add kernel prefix for kernel messages */
948 	if (flags & ISKERNEL) {
949 		snprintf(buf, sizeof(buf), "%s: %s",
950 		    use_bootfile ? bootfile : "kernel", msg);
951 		msg = buf;
952 		msglen = strlen(buf);
953 	}
954 
955 	/* log the message to the particular outputs */
956 	if (!Initialized) {
957 		f = &consfile;
958 		/*
959 		 * Open in non-blocking mode to avoid hangs during open
960 		 * and close(waiting for the port to drain).
961 		 */
962 		f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
963 
964 		if (f->f_file >= 0) {
965 			(void)strlcpy(f->f_lasttime, timestamp,
966 				sizeof(f->f_lasttime));
967 			fprintlog(f, flags, msg);
968 			(void)close(f->f_file);
969 		}
970 		(void)sigsetmask(omask);
971 		return;
972 	}
973 	for (f = Files; f; f = f->f_next) {
974 		/* skip messages that are incorrect priority */
975 		if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
976 		     ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
977 		     ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
978 		     )
979 		    || f->f_pmask[fac] == INTERNAL_NOPRI)
980 			continue;
981 
982 		/* skip messages with the incorrect hostname */
983 		if (skip_message(from, f->f_host, 0))
984 			continue;
985 
986 		/* skip messages with the incorrect program name */
987 		if (skip_message(prog, f->f_program, 1))
988 			continue;
989 
990 		/* skip message to console if it has already been printed */
991 		if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
992 			continue;
993 
994 		/* don't output marks to recently written files */
995 		if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
996 			continue;
997 
998 		/*
999 		 * suppress duplicate lines to this file
1000 		 */
1001 		if (no_compress - (f->f_type != F_PIPE) < 1 &&
1002 		    (flags & MARK) == 0 && msglen == f->f_prevlen &&
1003 		    f->f_prevline && !strcmp(msg, f->f_prevline) &&
1004 		    !strcasecmp(from, f->f_prevhost)) {
1005 			(void)strlcpy(f->f_lasttime, timestamp,
1006 				sizeof(f->f_lasttime));
1007 			f->f_prevcount++;
1008 			dprintf("msg repeated %d times, %ld sec of %d\n",
1009 			    f->f_prevcount, (long)(now - f->f_time),
1010 			    repeatinterval[f->f_repeatcount]);
1011 			/*
1012 			 * If domark would have logged this by now,
1013 			 * flush it now (so we don't hold isolated messages),
1014 			 * but back off so we'll flush less often
1015 			 * in the future.
1016 			 */
1017 			if (now > REPEATTIME(f)) {
1018 				fprintlog(f, flags, (char *)NULL);
1019 				BACKOFF(f);
1020 			}
1021 		} else {
1022 			/* new line, save it */
1023 			if (f->f_prevcount)
1024 				fprintlog(f, 0, (char *)NULL);
1025 			f->f_repeatcount = 0;
1026 			f->f_prevpri = pri;
1027 			(void)strlcpy(f->f_lasttime, timestamp,
1028 				sizeof(f->f_lasttime));
1029 			(void)strlcpy(f->f_prevhost, from,
1030 			    sizeof(f->f_prevhost));
1031 			if (msglen < MAXSVLINE) {
1032 				f->f_prevlen = msglen;
1033 				(void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
1034 				fprintlog(f, flags, (char *)NULL);
1035 			} else {
1036 				f->f_prevline[0] = 0;
1037 				f->f_prevlen = 0;
1038 				fprintlog(f, flags, msg);
1039 			}
1040 		}
1041 	}
1042 	(void)sigsetmask(omask);
1043 }
1044 
1045 static void
1046 dofsync(void)
1047 {
1048 	struct filed *f;
1049 
1050 	for (f = Files; f; f = f->f_next) {
1051 		if ((f->f_type == F_FILE) &&
1052 		    (f->f_flags & FFLAG_NEEDSYNC)) {
1053 			f->f_flags &= ~FFLAG_NEEDSYNC;
1054 			(void)fsync(f->f_file);
1055 		}
1056 	}
1057 }
1058 
1059 static void
1060 fprintlog(struct filed *f, int flags, const char *msg)
1061 {
1062 	struct iovec iov[7];
1063 	struct iovec *v;
1064 	struct addrinfo *r;
1065 	int i, l, lsent = 0;
1066 	char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
1067 	char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
1068 	const char *msgret;
1069 
1070 	v = iov;
1071 	if (f->f_type == F_WALL) {
1072 		v->iov_base = greetings;
1073 		/* The time displayed is not synchornized with the other log
1074 		 * destinations (like messages).  Following fragment was using
1075 		 * ctime(&now), which was updating the time every 30 sec.
1076 		 * With f_lasttime, time is synchronized correctly.
1077 		 */
1078 		v->iov_len = snprintf(greetings, sizeof greetings,
1079 		    "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
1080 		    f->f_prevhost, f->f_lasttime);
1081 		if (v->iov_len > 0)
1082 			v++;
1083 		v->iov_base = nul;
1084 		v->iov_len = 0;
1085 		v++;
1086 	} else {
1087 		v->iov_base = f->f_lasttime;
1088 		v->iov_len = strlen(f->f_lasttime);
1089 		v++;
1090 		v->iov_base = space;
1091 		v->iov_len = 1;
1092 		v++;
1093 	}
1094 
1095 	if (LogFacPri) {
1096 	  	static char fp_buf[30];	/* Hollow laugh */
1097 		int fac = f->f_prevpri & LOG_FACMASK;
1098 		int pri = LOG_PRI(f->f_prevpri);
1099 		const char *f_s = NULL;
1100 		char f_n[5];	/* Hollow laugh */
1101 		const char *p_s = NULL;
1102 		char p_n[5];	/* Hollow laugh */
1103 
1104 		if (LogFacPri > 1) {
1105 		  CODE *c;
1106 
1107 		  for (c = facilitynames; c->c_name; c++) {
1108 		    if (c->c_val == fac) {
1109 		      f_s = c->c_name;
1110 		      break;
1111 		    }
1112 		  }
1113 		  for (c = prioritynames; c->c_name; c++) {
1114 		    if (c->c_val == pri) {
1115 		      p_s = c->c_name;
1116 		      break;
1117 		    }
1118 		  }
1119 		}
1120 		if (!f_s) {
1121 		  snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1122 		  f_s = f_n;
1123 		}
1124 		if (!p_s) {
1125 		  snprintf(p_n, sizeof p_n, "%d", pri);
1126 		  p_s = p_n;
1127 		}
1128 		snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
1129 		v->iov_base = fp_buf;
1130 		v->iov_len = strlen(fp_buf);
1131 	} else {
1132 		v->iov_base = nul;
1133 		v->iov_len = 0;
1134 	}
1135 	v++;
1136 
1137 	v->iov_base = f->f_prevhost;
1138 	v->iov_len = strlen(v->iov_base);
1139 	v++;
1140 	v->iov_base = space;
1141 	v->iov_len = 1;
1142 	v++;
1143 
1144 	if (msg) {
1145 		wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1146 		if (wmsg == NULL) {
1147 			logerror("strdup");
1148 			exit(1);
1149 		}
1150 		v->iov_base = wmsg;
1151 		v->iov_len = strlen(msg);
1152 	} else if (f->f_prevcount > 1) {
1153 		v->iov_base = repbuf;
1154 		v->iov_len = snprintf(repbuf, sizeof repbuf,
1155 		    "last message repeated %d times", f->f_prevcount);
1156 	} else if (f->f_prevline) {
1157 		v->iov_base = f->f_prevline;
1158 		v->iov_len = f->f_prevlen;
1159 	} else {
1160 		return;
1161 	}
1162 	v++;
1163 
1164 	dprintf("Logging to %s", TypeNames[f->f_type]);
1165 	f->f_time = now;
1166 
1167 	switch (f->f_type) {
1168 		int port;
1169 	case F_UNUSED:
1170 		dprintf("\n");
1171 		break;
1172 
1173 	case F_FORW:
1174 		port = (int)ntohs(((struct sockaddr_in *)
1175 			    (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1176 		if (port != 514) {
1177 			dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port);
1178 		} else {
1179 			dprintf(" %s\n", f->f_un.f_forw.f_hname);
1180 		}
1181 		/* check for local vs remote messages */
1182 		if (strcasecmp(f->f_prevhost, LocalHostName))
1183 			l = snprintf(line, sizeof line - 1,
1184 			    "<%d>%.15s Forwarded from %s: %s",
1185 			    f->f_prevpri, (char *)iov[0].iov_base,
1186 			    f->f_prevhost, (char *)iov[5].iov_base);
1187 		else
1188 			l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1189 			     f->f_prevpri, (char *)iov[0].iov_base,
1190 			    (char *)iov[5].iov_base);
1191 		if (l < 0)
1192 			l = 0;
1193 		else if (l > MAXLINE)
1194 			l = MAXLINE;
1195 
1196 		if (finet) {
1197 			for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1198 				for (i = 0; i < *finet; i++) {
1199 #if 0
1200 					/*
1201 					 * should we check AF first, or just
1202 					 * trial and error? FWD
1203 					 */
1204 					if (r->ai_family ==
1205 					    address_family_of(finet[i+1]))
1206 #endif
1207 					lsent = sendto(finet[i+1], line, l, 0,
1208 					    r->ai_addr, r->ai_addrlen);
1209 					if (lsent == l)
1210 						break;
1211 				}
1212 				if (lsent == l && !send_to_all)
1213 					break;
1214 			}
1215 			dprintf("lsent/l: %d/%d\n", lsent, l);
1216 			if (lsent != l) {
1217 				int e = errno;
1218 				logerror("sendto");
1219 				errno = e;
1220 				switch (errno) {
1221 				case ENOBUFS:
1222 				case ENETDOWN:
1223 				case EHOSTUNREACH:
1224 				case EHOSTDOWN:
1225 					break;
1226 				/* case EBADF: */
1227 				/* case EACCES: */
1228 				/* case ENOTSOCK: */
1229 				/* case EFAULT: */
1230 				/* case EMSGSIZE: */
1231 				/* case EAGAIN: */
1232 				/* case ENOBUFS: */
1233 				/* case ECONNREFUSED: */
1234 				default:
1235 					dprintf("removing entry\n");
1236 					f->f_type = F_UNUSED;
1237 					break;
1238 				}
1239 			}
1240 		}
1241 		break;
1242 
1243 	case F_FILE:
1244 		dprintf(" %s\n", f->f_un.f_fname);
1245 		v->iov_base = lf;
1246 		v->iov_len = 1;
1247 		if (writev(f->f_file, iov, 7) < 0) {
1248 			/*
1249 			 * If writev(2) fails for potentially transient errors
1250 			 * like the filesystem being full, ignore it.
1251 			 * Otherwise remove this logfile from the list.
1252 			 */
1253 			if (errno != ENOSPC) {
1254 				int e = errno;
1255 				(void)close(f->f_file);
1256 				f->f_type = F_UNUSED;
1257 				errno = e;
1258 				logerror(f->f_un.f_fname);
1259 			}
1260 		} else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1261 			f->f_flags |= FFLAG_NEEDSYNC;
1262 			needdofsync = 1;
1263 		}
1264 		break;
1265 
1266 	case F_PIPE:
1267 		dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1268 		v->iov_base = lf;
1269 		v->iov_len = 1;
1270 		if (f->f_un.f_pipe.f_pid == 0) {
1271 			if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1272 						&f->f_un.f_pipe.f_pid)) < 0) {
1273 				f->f_type = F_UNUSED;
1274 				logerror(f->f_un.f_pipe.f_pname);
1275 				break;
1276 			}
1277 		}
1278 		if (writev(f->f_file, iov, 7) < 0) {
1279 			int e = errno;
1280 			(void)close(f->f_file);
1281 			if (f->f_un.f_pipe.f_pid > 0)
1282 				deadq_enter(f->f_un.f_pipe.f_pid,
1283 					    f->f_un.f_pipe.f_pname);
1284 			f->f_un.f_pipe.f_pid = 0;
1285 			errno = e;
1286 			logerror(f->f_un.f_pipe.f_pname);
1287 		}
1288 		break;
1289 
1290 	case F_CONSOLE:
1291 		if (flags & IGN_CONS) {
1292 			dprintf(" (ignored)\n");
1293 			break;
1294 		}
1295 		/* FALLTHROUGH */
1296 
1297 	case F_TTY:
1298 		dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1299 		v->iov_base = crlf;
1300 		v->iov_len = 2;
1301 
1302 		errno = 0;	/* ttymsg() only sometimes returns an errno */
1303 		if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) {
1304 			f->f_type = F_UNUSED;
1305 			logerror(msgret);
1306 		}
1307 		break;
1308 
1309 	case F_USERS:
1310 	case F_WALL:
1311 		dprintf("\n");
1312 		v->iov_base = crlf;
1313 		v->iov_len = 2;
1314 		wallmsg(f, iov);
1315 		break;
1316 	}
1317 	f->f_prevcount = 0;
1318 	if (wmsg)
1319 		free(wmsg);
1320 }
1321 
1322 /*
1323  *  WALLMSG -- Write a message to the world at large
1324  *
1325  *	Write the specified message to either the entire
1326  *	world, or a list of approved users.
1327  */
1328 static void
1329 wallmsg(struct filed *f, struct iovec *iov)
1330 {
1331 	static int reenter;			/* avoid calling ourselves */
1332 	FILE *uf;
1333 	struct utmp ut;
1334 	int i;
1335 	const char *p;
1336 	char line[sizeof(ut.ut_line) + 1];
1337 
1338 	if (reenter++)
1339 		return;
1340 	if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1341 		logerror(_PATH_UTMP);
1342 		reenter = 0;
1343 		return;
1344 	}
1345 	/* NOSTRICT */
1346 	while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1347 		if (ut.ut_name[0] == '\0')
1348 			continue;
1349 		/* We must use strncpy since ut_* may not be NUL terminated. */
1350 		strncpy(line, ut.ut_line, sizeof(line) - 1);
1351 		line[sizeof(line) - 1] = '\0';
1352 		if (f->f_type == F_WALL) {
1353 			if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) {
1354 				errno = 0;	/* already in msg */
1355 				logerror(p);
1356 			}
1357 			continue;
1358 		}
1359 		/* should we send the message to this user? */
1360 		for (i = 0; i < MAXUNAMES; i++) {
1361 			if (!f->f_un.f_uname[i][0])
1362 				break;
1363 			if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1364 			    UT_NAMESIZE)) {
1365 				if ((p = ttymsg(iov, 7, line, TTYMSGTIME))
1366 								!= NULL) {
1367 					errno = 0;	/* already in msg */
1368 					logerror(p);
1369 				}
1370 				break;
1371 			}
1372 		}
1373 	}
1374 	(void)fclose(uf);
1375 	reenter = 0;
1376 }
1377 
1378 static void
1379 reapchild(int signo __unused)
1380 {
1381 	int status;
1382 	pid_t pid;
1383 	struct filed *f;
1384 
1385 	while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1386 		if (!Initialized)
1387 			/* Don't tell while we are initting. */
1388 			continue;
1389 
1390 		/* First, look if it's a process from the dead queue. */
1391 		if (deadq_remove(pid))
1392 			goto oncemore;
1393 
1394 		/* Now, look in list of active processes. */
1395 		for (f = Files; f; f = f->f_next)
1396 			if (f->f_type == F_PIPE &&
1397 			    f->f_un.f_pipe.f_pid == pid) {
1398 				(void)close(f->f_file);
1399 				f->f_un.f_pipe.f_pid = 0;
1400 				log_deadchild(pid, status,
1401 					      f->f_un.f_pipe.f_pname);
1402 				break;
1403 			}
1404 	  oncemore:
1405 		continue;
1406 	}
1407 }
1408 
1409 /*
1410  * Return a printable representation of a host address.
1411  */
1412 static const char *
1413 cvthname(struct sockaddr *f)
1414 {
1415 	int error, hl;
1416 	sigset_t omask, nmask;
1417 	static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1418 
1419 	error = getnameinfo((struct sockaddr *)f,
1420 			    ((struct sockaddr *)f)->sa_len,
1421 			    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
1422 	dprintf("cvthname(%s)\n", ip);
1423 
1424 	if (error) {
1425 		dprintf("Malformed from address %s\n", gai_strerror(error));
1426 		return ("???");
1427 	}
1428 	if (!resolve)
1429 		return (ip);
1430 
1431 	sigemptyset(&nmask);
1432 	sigaddset(&nmask, SIGHUP);
1433 	sigprocmask(SIG_BLOCK, &nmask, &omask);
1434 	error = getnameinfo((struct sockaddr *)f,
1435 			    ((struct sockaddr *)f)->sa_len,
1436 			    hname, sizeof hname, NULL, 0, NI_NAMEREQD);
1437 	sigprocmask(SIG_SETMASK, &omask, NULL);
1438 	if (error) {
1439 		dprintf("Host name for your address (%s) unknown\n", ip);
1440 		return (ip);
1441 	}
1442 	hl = strlen(hname);
1443 	if (hl > 0 && hname[hl-1] == '.')
1444 		hname[--hl] = '\0';
1445 	trimdomain(hname, hl);
1446 	return (hname);
1447 }
1448 
1449 static void
1450 dodie(int signo)
1451 {
1452 
1453 	WantDie = signo;
1454 }
1455 
1456 static void
1457 domark(int signo __unused)
1458 {
1459 
1460 	MarkSet = 1;
1461 }
1462 
1463 /*
1464  * Print syslogd errors some place.
1465  */
1466 static void
1467 logerror(const char *type)
1468 {
1469 	char buf[512];
1470 	static int recursed = 0;
1471 
1472 	/* If there's an error while trying to log an error, give up. */
1473 	if (recursed)
1474 		return;
1475 	recursed++;
1476 	if (errno)
1477 		(void)snprintf(buf,
1478 		    sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1479 	else
1480 		(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1481 	errno = 0;
1482 	dprintf("%s\n", buf);
1483 	logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1484 	recursed--;
1485 }
1486 
1487 static void
1488 die(int signo)
1489 {
1490 	struct filed *f;
1491 	struct funix *fx;
1492 	int was_initialized;
1493 	char buf[100];
1494 
1495 	was_initialized = Initialized;
1496 	Initialized = 0;	/* Don't log SIGCHLDs. */
1497 	for (f = Files; f != NULL; f = f->f_next) {
1498 		/* flush any pending output */
1499 		if (f->f_prevcount)
1500 			fprintlog(f, 0, (char *)NULL);
1501 		if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) {
1502 			(void)close(f->f_file);
1503 			f->f_un.f_pipe.f_pid = 0;
1504 		}
1505 	}
1506 	Initialized = was_initialized;
1507 	if (signo) {
1508 		dprintf("syslogd: exiting on signal %d\n", signo);
1509 		(void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1510 		errno = 0;
1511 		logerror(buf);
1512 	}
1513 	STAILQ_FOREACH(fx, &funixes, next)
1514 		(void)unlink(fx->name);
1515 	pidfile_remove(pfh);
1516 
1517 	exit(1);
1518 }
1519 
1520 /*
1521  *  INIT -- Initialize syslogd from configuration table
1522  */
1523 static void
1524 init(int signo)
1525 {
1526 	int i;
1527 	FILE *cf;
1528 	struct filed *f, *next, **nextp;
1529 	char *p;
1530 	char cline[LINE_MAX];
1531  	char prog[NAME_MAX+1];
1532 	char host[MAXHOSTNAMELEN];
1533 	char oldLocalHostName[MAXHOSTNAMELEN];
1534 	char hostMsg[2*MAXHOSTNAMELEN+40];
1535 	char bootfileMsg[LINE_MAX];
1536 
1537 	dprintf("init\n");
1538 
1539 	/*
1540 	 * Load hostname (may have changed).
1541 	 */
1542 	if (signo != 0)
1543 		(void)strlcpy(oldLocalHostName, LocalHostName,
1544 		    sizeof(oldLocalHostName));
1545 	if (gethostname(LocalHostName, sizeof(LocalHostName)))
1546 		err(EX_OSERR, "gethostname() failed");
1547 	if ((p = strchr(LocalHostName, '.')) != NULL) {
1548 		*p++ = '\0';
1549 		LocalDomain = p;
1550 	} else {
1551 		LocalDomain = "";
1552 	}
1553 
1554 	/*
1555 	 *  Close all open log files.
1556 	 */
1557 	Initialized = 0;
1558 	for (f = Files; f != NULL; f = next) {
1559 		/* flush any pending output */
1560 		if (f->f_prevcount)
1561 			fprintlog(f, 0, (char *)NULL);
1562 
1563 		switch (f->f_type) {
1564 		case F_FILE:
1565 		case F_FORW:
1566 		case F_CONSOLE:
1567 		case F_TTY:
1568 			(void)close(f->f_file);
1569 			break;
1570 		case F_PIPE:
1571 			if (f->f_un.f_pipe.f_pid > 0) {
1572 				(void)close(f->f_file);
1573 				deadq_enter(f->f_un.f_pipe.f_pid,
1574 					    f->f_un.f_pipe.f_pname);
1575 			}
1576 			f->f_un.f_pipe.f_pid = 0;
1577 			break;
1578 		}
1579 		next = f->f_next;
1580 		if (f->f_program) free(f->f_program);
1581 		if (f->f_host) free(f->f_host);
1582 		free((char *)f);
1583 	}
1584 	Files = NULL;
1585 	nextp = &Files;
1586 
1587 	/* open the configuration file */
1588 	if ((cf = fopen(ConfFile, "r")) == NULL) {
1589 		dprintf("cannot open %s\n", ConfFile);
1590 		*nextp = (struct filed *)calloc(1, sizeof(*f));
1591 		if (*nextp == NULL) {
1592 			logerror("calloc");
1593 			exit(1);
1594 		}
1595 		cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1596 		(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1597 		if ((*nextp)->f_next == NULL) {
1598 			logerror("calloc");
1599 			exit(1);
1600 		}
1601 		cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1602 		Initialized = 1;
1603 		return;
1604 	}
1605 
1606 	/*
1607 	 *  Foreach line in the conf table, open that file.
1608 	 */
1609 	f = NULL;
1610 	(void)strlcpy(host, "*", sizeof(host));
1611 	(void)strlcpy(prog, "*", sizeof(prog));
1612 	while (fgets(cline, sizeof(cline), cf) != NULL) {
1613 		/*
1614 		 * check for end-of-section, comments, strip off trailing
1615 		 * spaces and newline character. #!prog is treated specially:
1616 		 * following lines apply only to that program.
1617 		 */
1618 		for (p = cline; isspace(*p); ++p)
1619 			continue;
1620 		if (*p == 0)
1621 			continue;
1622 		if (*p == '#') {
1623 			p++;
1624 			if (*p != '!' && *p != '+' && *p != '-')
1625 				continue;
1626 		}
1627 		if (*p == '+' || *p == '-') {
1628 			host[0] = *p++;
1629 			while (isspace(*p))
1630 				p++;
1631 			if ((!*p) || (*p == '*')) {
1632 				(void)strlcpy(host, "*", sizeof(host));
1633 				continue;
1634 			}
1635 			if (*p == '@')
1636 				p = LocalHostName;
1637 			for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1638 				if (!isalnum(*p) && *p != '.' && *p != '-'
1639 				    && *p != ',' && *p != ':' && *p != '%')
1640 					break;
1641 				host[i] = *p++;
1642 			}
1643 			host[i] = '\0';
1644 			continue;
1645 		}
1646 		if (*p == '!') {
1647 			p++;
1648 			while (isspace(*p)) p++;
1649 			if ((!*p) || (*p == '*')) {
1650 				(void)strlcpy(prog, "*", sizeof(prog));
1651 				continue;
1652 			}
1653 			for (i = 0; i < NAME_MAX; i++) {
1654 				if (!isprint(p[i]) || isspace(p[i]))
1655 					break;
1656 				prog[i] = p[i];
1657 			}
1658 			prog[i] = 0;
1659 			continue;
1660 		}
1661 		for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1662 			cline[i] = '\0';
1663 		f = (struct filed *)calloc(1, sizeof(*f));
1664 		if (f == NULL) {
1665 			logerror("calloc");
1666 			exit(1);
1667 		}
1668 		*nextp = f;
1669 		nextp = &f->f_next;
1670 		cfline(cline, f, prog, host);
1671 	}
1672 
1673 	/* close the configuration file */
1674 	(void)fclose(cf);
1675 
1676 	Initialized = 1;
1677 
1678 	if (Debug) {
1679 		int port;
1680 		for (f = Files; f; f = f->f_next) {
1681 			for (i = 0; i <= LOG_NFACILITIES; i++)
1682 				if (f->f_pmask[i] == INTERNAL_NOPRI)
1683 					printf("X ");
1684 				else
1685 					printf("%d ", f->f_pmask[i]);
1686 			printf("%s: ", TypeNames[f->f_type]);
1687 			switch (f->f_type) {
1688 			case F_FILE:
1689 				printf("%s", f->f_un.f_fname);
1690 				break;
1691 
1692 			case F_CONSOLE:
1693 			case F_TTY:
1694 				printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1695 				break;
1696 
1697 			case F_FORW:
1698 				port = (int)ntohs(((struct sockaddr_in *)
1699 				    (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1700 				if (port != 514) {
1701 					printf("%s:%d",
1702 						f->f_un.f_forw.f_hname, port);
1703 				} else {
1704 					printf("%s", f->f_un.f_forw.f_hname);
1705 				}
1706 				break;
1707 
1708 			case F_PIPE:
1709 				printf("%s", f->f_un.f_pipe.f_pname);
1710 				break;
1711 
1712 			case F_USERS:
1713 				for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1714 					printf("%s, ", f->f_un.f_uname[i]);
1715 				break;
1716 			}
1717 			if (f->f_program)
1718 				printf(" (%s)", f->f_program);
1719 			printf("\n");
1720 		}
1721 	}
1722 
1723 	logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1724 	dprintf("syslogd: restarted\n");
1725 	/*
1726 	 * Log a change in hostname, but only on a restart.
1727 	 */
1728 	if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1729 		(void)snprintf(hostMsg, sizeof(hostMsg),
1730 		    "syslogd: hostname changed, \"%s\" to \"%s\"",
1731 		    oldLocalHostName, LocalHostName);
1732 		logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1733 		dprintf("%s\n", hostMsg);
1734 	}
1735 	/*
1736 	 * Log the kernel boot file if we aren't going to use it as
1737 	 * the prefix, and if this is *not* a restart.
1738 	 */
1739 	if (signo == 0 && !use_bootfile) {
1740 		(void)snprintf(bootfileMsg, sizeof(bootfileMsg),
1741 		    "syslogd: kernel boot file is %s", bootfile);
1742 		logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1743 		dprintf("%s\n", bootfileMsg);
1744 	}
1745 }
1746 
1747 /*
1748  * Crack a configuration file line
1749  */
1750 static void
1751 cfline(const char *line, struct filed *f, const char *prog, const char *host)
1752 {
1753 	struct addrinfo hints, *res;
1754 	int error, i, pri, syncfile;
1755 	const char *p, *q;
1756 	char *bp;
1757 	char buf[MAXLINE], ebuf[100];
1758 
1759 	dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1760 
1761 	errno = 0;	/* keep strerror() stuff out of logerror messages */
1762 
1763 	/* clear out file entry */
1764 	memset(f, 0, sizeof(*f));
1765 	for (i = 0; i <= LOG_NFACILITIES; i++)
1766 		f->f_pmask[i] = INTERNAL_NOPRI;
1767 
1768 	/* save hostname if any */
1769 	if (host && *host == '*')
1770 		host = NULL;
1771 	if (host) {
1772 		int hl;
1773 
1774 		f->f_host = strdup(host);
1775 		if (f->f_host == NULL) {
1776 			logerror("strdup");
1777 			exit(1);
1778 		}
1779 		hl = strlen(f->f_host);
1780 		if (hl > 0 && f->f_host[hl-1] == '.')
1781 			f->f_host[--hl] = '\0';
1782 		trimdomain(f->f_host, hl);
1783 	}
1784 
1785 	/* save program name if any */
1786 	if (prog && *prog == '*')
1787 		prog = NULL;
1788 	if (prog) {
1789 		f->f_program = strdup(prog);
1790 		if (f->f_program == NULL) {
1791 			logerror("strdup");
1792 			exit(1);
1793 		}
1794 	}
1795 
1796 	/* scan through the list of selectors */
1797 	for (p = line; *p && *p != '\t' && *p != ' ';) {
1798 		int pri_done;
1799 		int pri_cmp;
1800 		int pri_invert;
1801 
1802 		/* find the end of this facility name list */
1803 		for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1804 			continue;
1805 
1806 		/* get the priority comparison */
1807 		pri_cmp = 0;
1808 		pri_done = 0;
1809 		pri_invert = 0;
1810 		if (*q == '!') {
1811 			pri_invert = 1;
1812 			q++;
1813 		}
1814 		while (!pri_done) {
1815 			switch (*q) {
1816 			case '<':
1817 				pri_cmp |= PRI_LT;
1818 				q++;
1819 				break;
1820 			case '=':
1821 				pri_cmp |= PRI_EQ;
1822 				q++;
1823 				break;
1824 			case '>':
1825 				pri_cmp |= PRI_GT;
1826 				q++;
1827 				break;
1828 			default:
1829 				pri_done++;
1830 				break;
1831 			}
1832 		}
1833 
1834 		/* collect priority name */
1835 		for (bp = buf; *q && !strchr("\t,; ", *q); )
1836 			*bp++ = *q++;
1837 		*bp = '\0';
1838 
1839 		/* skip cruft */
1840 		while (strchr(",;", *q))
1841 			q++;
1842 
1843 		/* decode priority name */
1844 		if (*buf == '*') {
1845 			pri = LOG_PRIMASK;
1846 			pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1847 		} else {
1848 			/* Ignore trailing spaces. */
1849 			for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
1850 				buf[i] = '\0';
1851 
1852 			pri = decode(buf, prioritynames);
1853 			if (pri < 0) {
1854 				(void)snprintf(ebuf, sizeof ebuf,
1855 				    "unknown priority name \"%s\"", buf);
1856 				logerror(ebuf);
1857 				return;
1858 			}
1859 		}
1860 		if (!pri_cmp)
1861 			pri_cmp = (UniquePriority)
1862 				  ? (PRI_EQ)
1863 				  : (PRI_EQ | PRI_GT)
1864 				  ;
1865 		if (pri_invert)
1866 			pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
1867 
1868 		/* scan facilities */
1869 		while (*p && !strchr("\t.; ", *p)) {
1870 			for (bp = buf; *p && !strchr("\t,;. ", *p); )
1871 				*bp++ = *p++;
1872 			*bp = '\0';
1873 
1874 			if (*buf == '*') {
1875 				for (i = 0; i < LOG_NFACILITIES; i++) {
1876 					f->f_pmask[i] = pri;
1877 					f->f_pcmp[i] = pri_cmp;
1878 				}
1879 			} else {
1880 				i = decode(buf, facilitynames);
1881 				if (i < 0) {
1882 					(void)snprintf(ebuf, sizeof ebuf,
1883 					    "unknown facility name \"%s\"",
1884 					    buf);
1885 					logerror(ebuf);
1886 					return;
1887 				}
1888 				f->f_pmask[i >> 3] = pri;
1889 				f->f_pcmp[i >> 3] = pri_cmp;
1890 			}
1891 			while (*p == ',' || *p == ' ')
1892 				p++;
1893 		}
1894 
1895 		p = q;
1896 	}
1897 
1898 	/* skip to action part */
1899 	while (*p == '\t' || *p == ' ')
1900 		p++;
1901 
1902 	if (*p == '-') {
1903 		syncfile = 0;
1904 		p++;
1905 	} else
1906 		syncfile = 1;
1907 
1908 	switch (*p) {
1909 	case '@':
1910 		{
1911 			char *tp;
1912 			/*
1913 			 * scan forward to see if there is a port defined.
1914 			 * so we can't use strlcpy..
1915 			 */
1916 			i = sizeof(f->f_un.f_forw.f_hname);
1917 			tp = f->f_un.f_forw.f_hname;
1918 			p++;
1919 
1920 			while (*p && (*p != ':') && (i-- > 0)) {
1921 				*tp++ = *p++;
1922 			}
1923 			*tp = '\0';
1924 		}
1925 		/* See if we copied a domain and have a port */
1926 		if (*p == ':')
1927 			p++;
1928 		else
1929 			p = NULL;
1930 
1931 		memset(&hints, 0, sizeof(hints));
1932 		hints.ai_family = family;
1933 		hints.ai_socktype = SOCK_DGRAM;
1934 		error = getaddrinfo(f->f_un.f_forw.f_hname,
1935 				p ? p : "syslog", &hints, &res);
1936 		if (error) {
1937 			logerror(gai_strerror(error));
1938 			break;
1939 		}
1940 		f->f_un.f_forw.f_addr = res;
1941 		f->f_type = F_FORW;
1942 		break;
1943 
1944 	case '/':
1945 		if ((f->f_file = open(p, logflags, 0600)) < 0) {
1946 			f->f_type = F_UNUSED;
1947 			logerror(p);
1948 			break;
1949 		}
1950 		if (syncfile)
1951 			f->f_flags |= FFLAG_SYNC;
1952 		if (isatty(f->f_file)) {
1953 			if (strcmp(p, ctty) == 0)
1954 				f->f_type = F_CONSOLE;
1955 			else
1956 				f->f_type = F_TTY;
1957 			(void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
1958 			    sizeof(f->f_un.f_fname));
1959 		} else {
1960 			(void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
1961 			f->f_type = F_FILE;
1962 		}
1963 		break;
1964 
1965 	case '|':
1966 		f->f_un.f_pipe.f_pid = 0;
1967 		(void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname));
1968 		f->f_type = F_PIPE;
1969 		break;
1970 
1971 	case '*':
1972 		f->f_type = F_WALL;
1973 		break;
1974 
1975 	default:
1976 		for (i = 0; i < MAXUNAMES && *p; i++) {
1977 			for (q = p; *q && *q != ','; )
1978 				q++;
1979 			(void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
1980 			if ((q - p) > UT_NAMESIZE)
1981 				f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
1982 			else
1983 				f->f_un.f_uname[i][q - p] = '\0';
1984 			while (*q == ',' || *q == ' ')
1985 				q++;
1986 			p = q;
1987 		}
1988 		f->f_type = F_USERS;
1989 		break;
1990 	}
1991 }
1992 
1993 
1994 /*
1995  *  Decode a symbolic name to a numeric value
1996  */
1997 static int
1998 decode(const char *name, CODE *codetab)
1999 {
2000 	CODE *c;
2001 	char *p, buf[40];
2002 
2003 	if (isdigit(*name))
2004 		return (atoi(name));
2005 
2006 	for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2007 		if (isupper(*name))
2008 			*p = tolower(*name);
2009 		else
2010 			*p = *name;
2011 	}
2012 	*p = '\0';
2013 	for (c = codetab; c->c_name; c++)
2014 		if (!strcmp(buf, c->c_name))
2015 			return (c->c_val);
2016 
2017 	return (-1);
2018 }
2019 
2020 static void
2021 markit(void)
2022 {
2023 	struct filed *f;
2024 	dq_t q, next;
2025 
2026 	now = time((time_t *)NULL);
2027 	MarkSeq += TIMERINTVL;
2028 	if (MarkSeq >= MarkInterval) {
2029 		logmsg(LOG_INFO, "-- MARK --",
2030 		    LocalHostName, ADDDATE|MARK);
2031 		MarkSeq = 0;
2032 	}
2033 
2034 	for (f = Files; f; f = f->f_next) {
2035 		if (f->f_prevcount && now >= REPEATTIME(f)) {
2036 			dprintf("flush %s: repeated %d times, %d sec.\n",
2037 			    TypeNames[f->f_type], f->f_prevcount,
2038 			    repeatinterval[f->f_repeatcount]);
2039 			fprintlog(f, 0, (char *)NULL);
2040 			BACKOFF(f);
2041 		}
2042 	}
2043 
2044 	/* Walk the dead queue, and see if we should signal somebody. */
2045 	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2046 		next = TAILQ_NEXT(q, dq_entries);
2047 
2048 		switch (q->dq_timeout) {
2049 		case 0:
2050 			/* Already signalled once, try harder now. */
2051 			if (kill(q->dq_pid, SIGKILL) != 0)
2052 				(void)deadq_remove(q->dq_pid);
2053 			break;
2054 
2055 		case 1:
2056 			/*
2057 			 * Timed out on dead queue, send terminate
2058 			 * signal.  Note that we leave the removal
2059 			 * from the dead queue to reapchild(), which
2060 			 * will also log the event (unless the process
2061 			 * didn't even really exist, in case we simply
2062 			 * drop it from the dead queue).
2063 			 */
2064 			if (kill(q->dq_pid, SIGTERM) != 0)
2065 				(void)deadq_remove(q->dq_pid);
2066 			/* FALLTHROUGH */
2067 
2068 		default:
2069 			q->dq_timeout--;
2070 		}
2071 	}
2072 	MarkSet = 0;
2073 	(void)alarm(TIMERINTVL);
2074 }
2075 
2076 /*
2077  * fork off and become a daemon, but wait for the child to come online
2078  * before returing to the parent, or we get disk thrashing at boot etc.
2079  * Set a timer so we don't hang forever if it wedges.
2080  */
2081 static int
2082 waitdaemon(int nochdir, int noclose, int maxwait)
2083 {
2084 	int fd;
2085 	int status;
2086 	pid_t pid, childpid;
2087 
2088 	switch (childpid = fork()) {
2089 	case -1:
2090 		return (-1);
2091 	case 0:
2092 		break;
2093 	default:
2094 		signal(SIGALRM, timedout);
2095 		alarm(maxwait);
2096 		while ((pid = wait3(&status, 0, NULL)) != -1) {
2097 			if (WIFEXITED(status))
2098 				errx(1, "child pid %d exited with return code %d",
2099 					pid, WEXITSTATUS(status));
2100 			if (WIFSIGNALED(status))
2101 				errx(1, "child pid %d exited on signal %d%s",
2102 					pid, WTERMSIG(status),
2103 					WCOREDUMP(status) ? " (core dumped)" :
2104 					"");
2105 			if (pid == childpid)	/* it's gone... */
2106 				break;
2107 		}
2108 		exit(0);
2109 	}
2110 
2111 	if (setsid() == -1)
2112 		return (-1);
2113 
2114 	if (!nochdir)
2115 		(void)chdir("/");
2116 
2117 	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2118 		(void)dup2(fd, STDIN_FILENO);
2119 		(void)dup2(fd, STDOUT_FILENO);
2120 		(void)dup2(fd, STDERR_FILENO);
2121 		if (fd > 2)
2122 			(void)close (fd);
2123 	}
2124 	return (getppid());
2125 }
2126 
2127 /*
2128  * We get a SIGALRM from the child when it's running and finished doing it's
2129  * fsync()'s or O_SYNC writes for all the boot messages.
2130  *
2131  * We also get a signal from the kernel if the timer expires, so check to
2132  * see what happened.
2133  */
2134 static void
2135 timedout(int sig __unused)
2136 {
2137 	int left;
2138 	left = alarm(0);
2139 	signal(SIGALRM, SIG_DFL);
2140 	if (left == 0)
2141 		errx(1, "timed out waiting for child");
2142 	else
2143 		_exit(0);
2144 }
2145 
2146 /*
2147  * Add `s' to the list of allowable peer addresses to accept messages
2148  * from.
2149  *
2150  * `s' is a string in the form:
2151  *
2152  *    [*]domainname[:{servicename|portnumber|*}]
2153  *
2154  * or
2155  *
2156  *    netaddr/maskbits[:{servicename|portnumber|*}]
2157  *
2158  * Returns -1 on error, 0 if the argument was valid.
2159  */
2160 static int
2161 allowaddr(char *s)
2162 {
2163 	char *cp1, *cp2;
2164 	struct allowedpeer ap;
2165 	struct servent *se;
2166 	int masklen = -1, i;
2167 	struct addrinfo hints, *res;
2168 	struct in_addr *addrp, *maskp;
2169 	u_int32_t *addr6p, *mask6p;
2170 	char ip[NI_MAXHOST];
2171 
2172 #ifdef INET6
2173 	if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2174 #endif
2175 		cp1 = s;
2176 	if ((cp1 = strrchr(cp1, ':'))) {
2177 		/* service/port provided */
2178 		*cp1++ = '\0';
2179 		if (strlen(cp1) == 1 && *cp1 == '*')
2180 			/* any port allowed */
2181 			ap.port = 0;
2182 		else if ((se = getservbyname(cp1, "udp"))) {
2183 			ap.port = ntohs(se->s_port);
2184 		} else {
2185 			ap.port = strtol(cp1, &cp2, 0);
2186 			if (*cp2 != '\0')
2187 				return (-1); /* port not numeric */
2188 		}
2189 	} else {
2190 		if ((se = getservbyname("syslog", "udp")))
2191 			ap.port = ntohs(se->s_port);
2192 		else
2193 			/* sanity, should not happen */
2194 			ap.port = 514;
2195 	}
2196 
2197 	if ((cp1 = strchr(s, '/')) != NULL &&
2198 	    strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2199 		*cp1 = '\0';
2200 		if ((masklen = atoi(cp1 + 1)) < 0)
2201 			return (-1);
2202 	}
2203 #ifdef INET6
2204 	if (*s == '[') {
2205 		cp2 = s + strlen(s) - 1;
2206 		if (*cp2 == ']') {
2207 			++s;
2208 			*cp2 = '\0';
2209 		} else {
2210 			cp2 = NULL;
2211 		}
2212 	} else {
2213 		cp2 = NULL;
2214 	}
2215 #endif
2216 	memset(&hints, 0, sizeof(hints));
2217 	hints.ai_family = PF_UNSPEC;
2218 	hints.ai_socktype = SOCK_DGRAM;
2219 	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2220 	if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2221 		ap.isnumeric = 1;
2222 		memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2223 		memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2224 		ap.a_mask.ss_family = res->ai_family;
2225 		if (res->ai_family == AF_INET) {
2226 			ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2227 			maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2228 			addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2229 			if (masklen < 0) {
2230 				/* use default netmask */
2231 				if (IN_CLASSA(ntohl(addrp->s_addr)))
2232 					maskp->s_addr = htonl(IN_CLASSA_NET);
2233 				else if (IN_CLASSB(ntohl(addrp->s_addr)))
2234 					maskp->s_addr = htonl(IN_CLASSB_NET);
2235 				else
2236 					maskp->s_addr = htonl(IN_CLASSC_NET);
2237 			} else if (masklen <= 32) {
2238 				/* convert masklen to netmask */
2239 				if (masklen == 0)
2240 					maskp->s_addr = 0;
2241 				else
2242 					maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2243 			} else {
2244 				freeaddrinfo(res);
2245 				return (-1);
2246 			}
2247 			/* Lose any host bits in the network number. */
2248 			addrp->s_addr &= maskp->s_addr;
2249 		}
2250 #ifdef INET6
2251 		else if (res->ai_family == AF_INET6 && masklen <= 128) {
2252 			ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2253 			if (masklen < 0)
2254 				masklen = 128;
2255 			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2256 			/* convert masklen to netmask */
2257 			while (masklen > 0) {
2258 				if (masklen < 32) {
2259 					*mask6p = htonl(~(0xffffffff >> masklen));
2260 					break;
2261 				}
2262 				*mask6p++ = 0xffffffff;
2263 				masklen -= 32;
2264 			}
2265 			/* Lose any host bits in the network number. */
2266 			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2267 			addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2268 			for (i = 0; i < 4; i++)
2269 				addr6p[i] &= mask6p[i];
2270 		}
2271 #endif
2272 		else {
2273 			freeaddrinfo(res);
2274 			return (-1);
2275 		}
2276 		freeaddrinfo(res);
2277 	} else {
2278 		/* arg `s' is domain name */
2279 		ap.isnumeric = 0;
2280 		ap.a_name = s;
2281 		if (cp1)
2282 			*cp1 = '/';
2283 #ifdef INET6
2284 		if (cp2) {
2285 			*cp2 = ']';
2286 			--s;
2287 		}
2288 #endif
2289 	}
2290 
2291 	if (Debug) {
2292 		printf("allowaddr: rule %d: ", NumAllowed);
2293 		if (ap.isnumeric) {
2294 			printf("numeric, ");
2295 			getnameinfo((struct sockaddr *)&ap.a_addr,
2296 				    ((struct sockaddr *)&ap.a_addr)->sa_len,
2297 				    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2298 			printf("addr = %s, ", ip);
2299 			getnameinfo((struct sockaddr *)&ap.a_mask,
2300 				    ((struct sockaddr *)&ap.a_mask)->sa_len,
2301 				    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2302 			printf("mask = %s; ", ip);
2303 		} else {
2304 			printf("domainname = %s; ", ap.a_name);
2305 		}
2306 		printf("port = %d\n", ap.port);
2307 	}
2308 
2309 	if ((AllowedPeers = realloc(AllowedPeers,
2310 				    ++NumAllowed * sizeof(struct allowedpeer)))
2311 	    == NULL) {
2312 		logerror("realloc");
2313 		exit(1);
2314 	}
2315 	memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2316 	return (0);
2317 }
2318 
2319 /*
2320  * Validate that the remote peer has permission to log to us.
2321  */
2322 static int
2323 validate(struct sockaddr *sa, const char *hname)
2324 {
2325 	int i, j, reject;
2326 	size_t l1, l2;
2327 	char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2328 	struct allowedpeer *ap;
2329 	struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2330 	struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2331 	struct addrinfo hints, *res;
2332 	u_short sport;
2333 
2334 	if (NumAllowed == 0)
2335 		/* traditional behaviour, allow everything */
2336 		return (1);
2337 
2338 	(void)strlcpy(name, hname, sizeof(name));
2339 	memset(&hints, 0, sizeof(hints));
2340 	hints.ai_family = PF_UNSPEC;
2341 	hints.ai_socktype = SOCK_DGRAM;
2342 	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2343 	if (getaddrinfo(name, NULL, &hints, &res) == 0)
2344 		freeaddrinfo(res);
2345 	else if (strchr(name, '.') == NULL) {
2346 		strlcat(name, ".", sizeof name);
2347 		strlcat(name, LocalDomain, sizeof name);
2348 	}
2349 	if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2350 			NI_NUMERICHOST | NI_NUMERICSERV) != 0)
2351 		return (0);	/* for safety, should not occur */
2352 	dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2353 		ip, port, name);
2354 	sport = atoi(port);
2355 
2356 	/* now, walk down the list */
2357 	for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2358 		if (ap->port != 0 && ap->port != sport) {
2359 			dprintf("rejected in rule %d due to port mismatch.\n", i);
2360 			continue;
2361 		}
2362 
2363 		if (ap->isnumeric) {
2364 			if (ap->a_addr.ss_family != sa->sa_family) {
2365 				dprintf("rejected in rule %d due to address family mismatch.\n", i);
2366 				continue;
2367 			}
2368 			if (ap->a_addr.ss_family == AF_INET) {
2369 				sin4 = (struct sockaddr_in *)sa;
2370 				a4p = (struct sockaddr_in *)&ap->a_addr;
2371 				m4p = (struct sockaddr_in *)&ap->a_mask;
2372 				if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2373 				    != a4p->sin_addr.s_addr) {
2374 					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2375 					continue;
2376 				}
2377 			}
2378 #ifdef INET6
2379 			else if (ap->a_addr.ss_family == AF_INET6) {
2380 				sin6 = (struct sockaddr_in6 *)sa;
2381 				a6p = (struct sockaddr_in6 *)&ap->a_addr;
2382 				m6p = (struct sockaddr_in6 *)&ap->a_mask;
2383 				if (a6p->sin6_scope_id != 0 &&
2384 				    sin6->sin6_scope_id != a6p->sin6_scope_id) {
2385 					dprintf("rejected in rule %d due to scope mismatch.\n", i);
2386 					continue;
2387 				}
2388 				reject = 0;
2389 				for (j = 0; j < 16; j += 4) {
2390 					if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2391 					    != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2392 						++reject;
2393 						break;
2394 					}
2395 				}
2396 				if (reject) {
2397 					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2398 					continue;
2399 				}
2400 			}
2401 #endif
2402 			else
2403 				continue;
2404 		} else {
2405 			cp = ap->a_name;
2406 			l1 = strlen(name);
2407 			if (*cp == '*') {
2408 				/* allow wildmatch */
2409 				cp++;
2410 				l2 = strlen(cp);
2411 				if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2412 					dprintf("rejected in rule %d due to name mismatch.\n", i);
2413 					continue;
2414 				}
2415 			} else {
2416 				/* exact match */
2417 				l2 = strlen(cp);
2418 				if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2419 					dprintf("rejected in rule %d due to name mismatch.\n", i);
2420 					continue;
2421 				}
2422 			}
2423 		}
2424 		dprintf("accepted in rule %d.\n", i);
2425 		return (1);	/* hooray! */
2426 	}
2427 	return (0);
2428 }
2429 
2430 /*
2431  * Fairly similar to popen(3), but returns an open descriptor, as
2432  * opposed to a FILE *.
2433  */
2434 static int
2435 p_open(const char *prog, pid_t *rpid)
2436 {
2437 	int pfd[2], nulldesc, i;
2438 	pid_t pid;
2439 	sigset_t omask, mask;
2440 	char *argv[4]; /* sh -c cmd NULL */
2441 	char errmsg[200];
2442 
2443 	if (pipe(pfd) == -1)
2444 		return (-1);
2445 	if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2446 		/* we are royally screwed anyway */
2447 		return (-1);
2448 
2449 	sigemptyset(&mask);
2450 	sigaddset(&mask, SIGALRM);
2451 	sigaddset(&mask, SIGHUP);
2452 	sigprocmask(SIG_BLOCK, &mask, &omask);
2453 	switch ((pid = fork())) {
2454 	case -1:
2455 		sigprocmask(SIG_SETMASK, &omask, 0);
2456 		close(nulldesc);
2457 		return (-1);
2458 
2459 	case 0:
2460 		argv[0] = strdup("sh");
2461 		argv[1] = strdup("-c");
2462 		argv[2] = strdup(prog);
2463 		argv[3] = NULL;
2464 		if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2465 			logerror("strdup");
2466 			exit(1);
2467 		}
2468 
2469 		alarm(0);
2470 		(void)setsid();	/* Avoid catching SIGHUPs. */
2471 
2472 		/*
2473 		 * Throw away pending signals, and reset signal
2474 		 * behaviour to standard values.
2475 		 */
2476 		signal(SIGALRM, SIG_IGN);
2477 		signal(SIGHUP, SIG_IGN);
2478 		sigprocmask(SIG_SETMASK, &omask, 0);
2479 		signal(SIGPIPE, SIG_DFL);
2480 		signal(SIGQUIT, SIG_DFL);
2481 		signal(SIGALRM, SIG_DFL);
2482 		signal(SIGHUP, SIG_DFL);
2483 
2484 		dup2(pfd[0], STDIN_FILENO);
2485 		dup2(nulldesc, STDOUT_FILENO);
2486 		dup2(nulldesc, STDERR_FILENO);
2487 		for (i = getdtablesize(); i > 2; i--)
2488 			(void)close(i);
2489 
2490 		(void)execvp(_PATH_BSHELL, argv);
2491 		_exit(255);
2492 	}
2493 
2494 	sigprocmask(SIG_SETMASK, &omask, 0);
2495 	close(nulldesc);
2496 	close(pfd[0]);
2497 	/*
2498 	 * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
2499 	 * supposed to get an EWOULDBLOCK on writev(2), which is
2500 	 * caught by the logic above anyway, which will in turn close
2501 	 * the pipe, and fork a new logging subprocess if necessary.
2502 	 * The stale subprocess will be killed some time later unless
2503 	 * it terminated itself due to closing its input pipe (so we
2504 	 * get rid of really dead puppies).
2505 	 */
2506 	if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2507 		/* This is bad. */
2508 		(void)snprintf(errmsg, sizeof errmsg,
2509 			       "Warning: cannot change pipe to PID %d to "
2510 			       "non-blocking behaviour.",
2511 			       (int)pid);
2512 		logerror(errmsg);
2513 	}
2514 	*rpid = pid;
2515 	return (pfd[1]);
2516 }
2517 
2518 static void
2519 deadq_enter(pid_t pid, const char *name)
2520 {
2521 	dq_t p;
2522 	int status;
2523 
2524 	/*
2525 	 * Be paranoid, if we can't signal the process, don't enter it
2526 	 * into the dead queue (perhaps it's already dead).  If possible,
2527 	 * we try to fetch and log the child's status.
2528 	 */
2529 	if (kill(pid, 0) != 0) {
2530 		if (waitpid(pid, &status, WNOHANG) > 0)
2531 			log_deadchild(pid, status, name);
2532 		return;
2533 	}
2534 
2535 	p = malloc(sizeof(struct deadq_entry));
2536 	if (p == NULL) {
2537 		logerror("malloc");
2538 		exit(1);
2539 	}
2540 
2541 	p->dq_pid = pid;
2542 	p->dq_timeout = DQ_TIMO_INIT;
2543 	TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2544 }
2545 
2546 static int
2547 deadq_remove(pid_t pid)
2548 {
2549 	dq_t q;
2550 
2551 	TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2552 		if (q->dq_pid == pid) {
2553 			TAILQ_REMOVE(&deadq_head, q, dq_entries);
2554 				free(q);
2555 				return (1);
2556 		}
2557 	}
2558 
2559 	return (0);
2560 }
2561 
2562 static void
2563 log_deadchild(pid_t pid, int status, const char *name)
2564 {
2565 	int code;
2566 	char buf[256];
2567 	const char *reason;
2568 
2569 	errno = 0; /* Keep strerror() stuff out of logerror messages. */
2570 	if (WIFSIGNALED(status)) {
2571 		reason = "due to signal";
2572 		code = WTERMSIG(status);
2573 	} else {
2574 		reason = "with status";
2575 		code = WEXITSTATUS(status);
2576 		if (code == 0)
2577 			return;
2578 	}
2579 	(void)snprintf(buf, sizeof buf,
2580 		       "Logging subprocess %d (%s) exited %s %d.",
2581 		       pid, name, reason, code);
2582 	logerror(buf);
2583 }
2584 
2585 static int *
2586 socksetup(int af, const char *bindhostname)
2587 {
2588 	struct addrinfo hints, *res, *r;
2589 	int error, maxs, *s, *socks;
2590 
2591 	memset(&hints, 0, sizeof(hints));
2592 	hints.ai_flags = AI_PASSIVE;
2593 	hints.ai_family = af;
2594 	hints.ai_socktype = SOCK_DGRAM;
2595 	error = getaddrinfo(bindhostname, "syslog", &hints, &res);
2596 	if (error) {
2597 		logerror(gai_strerror(error));
2598 		errno = 0;
2599 		die(0);
2600 	}
2601 
2602 	/* Count max number of sockets we may open */
2603 	for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2604 	socks = malloc((maxs+1) * sizeof(int));
2605 	if (socks == NULL) {
2606 		logerror("couldn't allocate memory for sockets");
2607 		die(0);
2608 	}
2609 
2610 	*socks = 0;   /* num of sockets counter at start of array */
2611 	s = socks + 1;
2612 	for (r = res; r; r = r->ai_next) {
2613 		int on = 1;
2614 		*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2615 		if (*s < 0) {
2616 			logerror("socket");
2617 			continue;
2618 		}
2619 		if (r->ai_family == AF_INET6) {
2620 			if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2621 				       (char *)&on, sizeof (on)) < 0) {
2622 				logerror("setsockopt");
2623 				close(*s);
2624 				continue;
2625 			}
2626 		}
2627 		if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
2628 			       (char *)&on, sizeof (on)) < 0) {
2629 			logerror("setsockopt");
2630 			close(*s);
2631 			continue;
2632 		}
2633 		if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2634 			close(*s);
2635 			logerror("bind");
2636 			continue;
2637 		}
2638 
2639 		double_rbuf(*s);
2640 
2641 		(*socks)++;
2642 		s++;
2643 	}
2644 
2645 	if (*socks == 0) {
2646 		free(socks);
2647 		if (Debug)
2648 			return (NULL);
2649 		else
2650 			die(0);
2651 	}
2652 	if (res)
2653 		freeaddrinfo(res);
2654 
2655 	return (socks);
2656 }
2657 
2658 static void
2659 double_rbuf(int fd)
2660 {
2661 	socklen_t slen, len;
2662 
2663 	if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
2664 		len *= 2;
2665 		setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen);
2666 	}
2667 }
2668