xref: /freebsd/usr.sbin/syslogd/syslogd.c (revision 0f2bd1e89db1a2f09268edea21e0ead329e092df)
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/mman.h>
81 #include <sys/stat.h>
82 #include <sys/wait.h>
83 #include <sys/socket.h>
84 #include <sys/queue.h>
85 #include <sys/uio.h>
86 #include <sys/un.h>
87 #include <sys/time.h>
88 #include <sys/resource.h>
89 #include <sys/syslimits.h>
90 #include <sys/types.h>
91 
92 #include <netinet/in.h>
93 #include <netdb.h>
94 #include <arpa/inet.h>
95 
96 #include <ctype.h>
97 #include <err.h>
98 #include <errno.h>
99 #include <fcntl.h>
100 #include <libutil.h>
101 #include <limits.h>
102 #include <paths.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 <utmpx.h>
110 
111 #include "pathnames.h"
112 #include "ttymsg.h"
113 
114 #define SYSLOG_NAMES
115 #include <sys/syslog.h>
116 
117 const char	*ConfFile = _PATH_LOGCONF;
118 const char	*PidFile = _PATH_LOGPID;
119 const char	ctty[] = _PATH_CONSOLE;
120 
121 #define	dprintf		if (Debug) printf
122 
123 #define	MAXUNAMES	20	/* maximum number of user names */
124 
125 /*
126  * Unix sockets.
127  * We have two default sockets, one with 666 permissions,
128  * and one for privileged programs.
129  */
130 struct funix {
131 	int			s;
132 	const char		*name;
133 	mode_t			mode;
134 	STAILQ_ENTRY(funix)	next;
135 };
136 struct funix funix_secure =	{ -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
137 				{ NULL } };
138 struct funix funix_default =	{ -1, _PATH_LOG, DEFFILEMODE,
139 				{ &funix_secure } };
140 
141 STAILQ_HEAD(, funix) funixes =	{ &funix_default,
142 				&(funix_secure.next.stqe_next) };
143 
144 /*
145  * Flags to logmsg().
146  */
147 
148 #define	IGN_CONS	0x001	/* don't print on console */
149 #define	SYNC_FILE	0x002	/* do fsync on file after printing */
150 #define	ADDDATE		0x004	/* add a date to the message */
151 #define	MARK		0x008	/* this message is a mark */
152 #define	ISKERNEL	0x010	/* kernel generated message */
153 
154 /*
155  * This structure represents the files that will have log
156  * copies printed.
157  * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
158  * or if f_type if F_PIPE and f_pid > 0.
159  */
160 
161 struct filed {
162 	struct	filed *f_next;		/* next in linked list */
163 	short	f_type;			/* entry type, see below */
164 	short	f_file;			/* file descriptor */
165 	time_t	f_time;			/* time this was last written */
166 	char	*f_host;		/* host from which to recd. */
167 	u_char	f_pmask[LOG_NFACILITIES+1];	/* priority mask */
168 	u_char	f_pcmp[LOG_NFACILITIES+1];	/* compare priority */
169 #define PRI_LT	0x1
170 #define PRI_EQ	0x2
171 #define PRI_GT	0x4
172 	char	*f_program;		/* program this applies to */
173 	union {
174 		char	f_uname[MAXUNAMES][MAXLOGNAME];
175 		struct {
176 			char	f_hname[MAXHOSTNAMELEN];
177 			struct addrinfo *f_addr;
178 
179 		} f_forw;		/* forwarding address */
180 		char	f_fname[MAXPATHLEN];
181 		struct {
182 			char	f_pname[MAXPATHLEN];
183 			pid_t	f_pid;
184 		} f_pipe;
185 	} f_un;
186 	char	f_prevline[MAXSVLINE];		/* last message logged */
187 	char	f_lasttime[16];			/* time of last occurrence */
188 	char	f_prevhost[MAXHOSTNAMELEN];	/* host from which recd. */
189 	int	f_prevpri;			/* pri of f_prevline */
190 	int	f_prevlen;			/* length of f_prevline */
191 	int	f_prevcount;			/* repetition cnt of prevline */
192 	u_int	f_repeatcount;			/* number of "repeated" msgs */
193 	int	f_flags;			/* file-specific flags */
194 #define	FFLAG_SYNC 0x01
195 #define	FFLAG_NEEDSYNC	0x02
196 };
197 
198 /*
199  * Queue of about-to-be dead processes we should watch out for.
200  */
201 
202 TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
203 struct stailhead *deadq_headp;
204 
205 struct deadq_entry {
206 	pid_t				dq_pid;
207 	int				dq_timeout;
208 	TAILQ_ENTRY(deadq_entry)	dq_entries;
209 };
210 
211 /*
212  * The timeout to apply to processes waiting on the dead queue.  Unit
213  * of measure is `mark intervals', i.e. 20 minutes by default.
214  * Processes on the dead queue will be terminated after that time.
215  */
216 
217 #define	 DQ_TIMO_INIT	2
218 
219 typedef struct deadq_entry *dq_t;
220 
221 
222 /*
223  * Struct to hold records of network addresses that are allowed to log
224  * to us.
225  */
226 struct allowedpeer {
227 	int isnumeric;
228 	u_short port;
229 	union {
230 		struct {
231 			struct sockaddr_storage addr;
232 			struct sockaddr_storage mask;
233 		} numeric;
234 		char *name;
235 	} u;
236 #define a_addr u.numeric.addr
237 #define a_mask u.numeric.mask
238 #define a_name u.name
239 };
240 
241 
242 /*
243  * Intervals at which we flush out "message repeated" messages,
244  * in seconds after previous message is logged.  After each flush,
245  * we move to the next interval until we reach the largest.
246  */
247 int	repeatinterval[] = { 30, 120, 600 };	/* # of secs before flush */
248 #define	MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
249 #define	REPEATTIME(f)	((f)->f_time + repeatinterval[(f)->f_repeatcount])
250 #define	BACKOFF(f)	{ if (++(f)->f_repeatcount > MAXREPEAT) \
251 				 (f)->f_repeatcount = MAXREPEAT; \
252 			}
253 
254 /* values for f_type */
255 #define F_UNUSED	0		/* unused entry */
256 #define F_FILE		1		/* regular file */
257 #define F_TTY		2		/* terminal */
258 #define F_CONSOLE	3		/* console terminal */
259 #define F_FORW		4		/* remote machine */
260 #define F_USERS		5		/* list of users */
261 #define F_WALL		6		/* everyone logged on */
262 #define F_PIPE		7		/* pipe to program */
263 
264 const char *TypeNames[8] = {
265 	"UNUSED",	"FILE",		"TTY",		"CONSOLE",
266 	"FORW",		"USERS",	"WALL",		"PIPE"
267 };
268 
269 static struct filed *Files;	/* Log files that we write to */
270 static struct filed consfile;	/* Console */
271 
272 static int	Debug;		/* debug flag */
273 static int	resolve = 1;	/* resolve hostname */
274 static char	LocalHostName[MAXHOSTNAMELEN];	/* our hostname */
275 static const char *LocalDomain;	/* our local domain name */
276 static int	*finet;		/* Internet datagram socket */
277 static int	fklog = -1;	/* /dev/klog */
278 static int	Initialized;	/* set when we have initialized ourselves */
279 static int	MarkInterval = 20 * 60;	/* interval between marks in seconds */
280 static int	MarkSeq;	/* mark sequence number */
281 static int	SecureMode;	/* when true, receive only unix domain socks */
282 #ifdef INET6
283 static int	family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
284 #else
285 static int	family = PF_INET; /* protocol family (IPv4 only) */
286 #endif
287 static int	mask_C1 = 1;	/* mask characters from 0x80 - 0x9F */
288 static int	send_to_all;	/* send message to all IPv4/IPv6 addresses */
289 static int	use_bootfile;	/* log entire bootfile for every kern msg */
290 static int	no_compress;	/* don't compress messages (1=pipes, 2=all) */
291 static int	logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
292 
293 static char	bootfile[MAXLINE+1]; /* booted kernel file */
294 
295 struct allowedpeer *AllowedPeers; /* List of allowed peers */
296 static int	NumAllowed;	/* Number of entries in AllowedPeers */
297 static int	RemoteAddDate;	/* Always set the date on remote messages */
298 
299 static int	UniquePriority;	/* Only log specified priority? */
300 static int	LogFacPri;	/* Put facility and priority in log message: */
301 				/* 0=no, 1=numeric, 2=names */
302 static int	KeepKernFac;	/* Keep remotely logged kernel facility */
303 static int	needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
304 static struct pidfh *pfh;
305 
306 volatile sig_atomic_t MarkSet, WantDie;
307 
308 static int	allowaddr(char *);
309 static void	cfline(const char *, struct filed *,
310 		    const char *, const char *);
311 static const char *cvthname(struct sockaddr *);
312 static void	deadq_enter(pid_t, const char *);
313 static int	deadq_remove(pid_t);
314 static int	decode(const char *, CODE *);
315 static void	die(int);
316 static void	dodie(int);
317 static void	dofsync(void);
318 static void	domark(int);
319 static void	fprintlog(struct filed *, int, const char *);
320 static int	*socksetup(int, char *);
321 static void	init(int);
322 static void	logerror(const char *);
323 static void	logmsg(int, const char *, const char *, int);
324 static void	log_deadchild(pid_t, int, const char *);
325 static void	markit(void);
326 static int	skip_message(const char *, const char *, int);
327 static void	printline(const char *, char *, int);
328 static void	printsys(char *);
329 static int	p_open(const char *, pid_t *);
330 static void	readklog(void);
331 static void	reapchild(int);
332 static void	usage(void);
333 static int	validate(struct sockaddr *, const char *);
334 static void	unmapped(struct sockaddr *);
335 static void	wallmsg(struct filed *, struct iovec *, const int iovlen);
336 static int	waitdaemon(int, int, int);
337 static void	timedout(int);
338 static void	double_rbuf(int);
339 
340 int
341 main(int argc, char *argv[])
342 {
343 	int ch, i, fdsrmax = 0, l;
344 	struct sockaddr_un sunx, fromunix;
345 	struct sockaddr_storage frominet;
346 	fd_set *fdsr = NULL;
347 	char line[MAXLINE + 1];
348 	char *bindhostname;
349 	const char *hname;
350 	struct timeval tv, *tvp;
351 	struct sigaction sact;
352 	struct funix *fx, *fx1;
353 	sigset_t mask;
354 	pid_t ppid = 1, spid;
355 	socklen_t len;
356 
357 	if (madvise(NULL, 0, MADV_PROTECT) != 0)
358 		dprintf("madvise() failed: %s\n", strerror(errno));
359 
360 	bindhostname = NULL;
361 	while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nop:P:sS:Tuv"))
362 	    != -1)
363 		switch (ch) {
364 		case '4':
365 			family = PF_INET;
366 			break;
367 #ifdef INET6
368 		case '6':
369 			family = PF_INET6;
370 			break;
371 #endif
372 		case '8':
373 			mask_C1 = 0;
374 			break;
375 		case 'A':
376 			send_to_all++;
377 			break;
378 		case 'a':		/* allow specific network addresses only */
379 			if (allowaddr(optarg) == -1)
380 				usage();
381 			break;
382 		case 'b':
383 			bindhostname = optarg;
384 			break;
385 		case 'c':
386 			no_compress++;
387 			break;
388 		case 'C':
389 			logflags |= O_CREAT;
390 			break;
391 		case 'd':		/* debug */
392 			Debug++;
393 			break;
394 		case 'f':		/* configuration file */
395 			ConfFile = optarg;
396 			break;
397 		case 'k':		/* keep remote kern fac */
398 			KeepKernFac = 1;
399 			break;
400 		case 'l':
401 		    {
402 			long	perml;
403 			mode_t	mode;
404 			char	*name, *ep;
405 
406 			if (optarg[0] == '/') {
407 				mode = DEFFILEMODE;
408 				name = optarg;
409 			} else if ((name = strchr(optarg, ':')) != NULL) {
410 				*name++ = '\0';
411 				if (name[0] != '/')
412 					errx(1, "socket name must be absolute "
413 					    "path");
414 				if (isdigit(*optarg)) {
415 					perml = strtol(optarg, &ep, 8);
416 				    if (*ep || perml < 0 ||
417 					perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
418 					    errx(1, "invalid mode %s, exiting",
419 						optarg);
420 				    mode = (mode_t )perml;
421 				} else
422 					errx(1, "invalid mode %s, exiting",
423 					    optarg);
424 			} else	/* doesn't begin with '/', and no ':' */
425 				errx(1, "can't parse path %s", optarg);
426 
427 			if (strlen(name) >= sizeof(sunx.sun_path))
428 				errx(1, "%s path too long, exiting", name);
429 			if ((fx = malloc(sizeof(struct funix))) == NULL)
430 				errx(1, "malloc failed");
431 			fx->s = -1;
432 			fx->name = name;
433 			fx->mode = mode;
434 			STAILQ_INSERT_TAIL(&funixes, fx, next);
435 			break;
436 		   }
437 		case 'm':		/* mark interval */
438 			MarkInterval = atoi(optarg) * 60;
439 			break;
440 		case 'n':
441 			resolve = 0;
442 			break;
443 		case 'o':
444 			use_bootfile = 1;
445 			break;
446 		case 'p':		/* path */
447 			if (strlen(optarg) >= sizeof(sunx.sun_path))
448 				errx(1, "%s path too long, exiting", optarg);
449 			funix_default.name = optarg;
450 			break;
451 		case 'P':		/* path for alt. PID */
452 			PidFile = optarg;
453 			break;
454 		case 's':		/* no network mode */
455 			SecureMode++;
456 			break;
457 		case 'S':		/* path for privileged originator */
458 			if (strlen(optarg) >= sizeof(sunx.sun_path))
459 				errx(1, "%s path too long, exiting", optarg);
460 			funix_secure.name = optarg;
461 			break;
462 		case 'T':
463 			RemoteAddDate = 1;
464 			break;
465 		case 'u':		/* only log specified priority */
466 			UniquePriority++;
467 			break;
468 		case 'v':		/* log facility and priority */
469 		  	LogFacPri++;
470 			break;
471 		default:
472 			usage();
473 		}
474 	if ((argc -= optind) != 0)
475 		usage();
476 
477 	pfh = pidfile_open(PidFile, 0600, &spid);
478 	if (pfh == NULL) {
479 		if (errno == EEXIST)
480 			errx(1, "syslogd already running, pid: %d", spid);
481 		warn("cannot open pid file");
482 	}
483 
484 	if (!Debug) {
485 		ppid = waitdaemon(0, 0, 30);
486 		if (ppid < 0) {
487 			warn("could not become daemon");
488 			pidfile_remove(pfh);
489 			exit(1);
490 		}
491 	} else {
492 		setlinebuf(stdout);
493 	}
494 
495 	if (NumAllowed)
496 		endservent();
497 
498 	consfile.f_type = F_CONSOLE;
499 	(void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
500 	    sizeof(consfile.f_un.f_fname));
501 	(void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
502 	(void)signal(SIGTERM, dodie);
503 	(void)signal(SIGINT, Debug ? dodie : SIG_IGN);
504 	(void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
505 	/*
506 	 * We don't want the SIGCHLD and SIGHUP handlers to interfere
507 	 * with each other; they are likely candidates for being called
508 	 * simultaneously (SIGHUP closes pipe descriptor, process dies,
509 	 * SIGCHLD happens).
510 	 */
511 	sigemptyset(&mask);
512 	sigaddset(&mask, SIGHUP);
513 	sact.sa_handler = reapchild;
514 	sact.sa_mask = mask;
515 	sact.sa_flags = SA_RESTART;
516 	(void)sigaction(SIGCHLD, &sact, NULL);
517 	(void)signal(SIGALRM, domark);
518 	(void)signal(SIGPIPE, SIG_IGN);	/* We'll catch EPIPE instead. */
519 	(void)alarm(TIMERINTVL);
520 
521 	TAILQ_INIT(&deadq_head);
522 
523 #ifndef SUN_LEN
524 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
525 #endif
526 	STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) {
527 		(void)unlink(fx->name);
528 		memset(&sunx, 0, sizeof(sunx));
529 		sunx.sun_family = AF_LOCAL;
530 		(void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path));
531 		fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0);
532 		if (fx->s < 0 ||
533 		    bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
534 		    chmod(fx->name, fx->mode) < 0) {
535 			(void)snprintf(line, sizeof line,
536 					"cannot create %s", fx->name);
537 			logerror(line);
538 			dprintf("cannot create %s (%d)\n", fx->name, errno);
539 			if (fx == &funix_default || fx == &funix_secure)
540 				die(0);
541 			else {
542 				STAILQ_REMOVE(&funixes, fx, funix, next);
543 				continue;
544 			}
545 			double_rbuf(fx->s);
546 		}
547 	}
548 	if (SecureMode <= 1)
549 		finet = socksetup(family, bindhostname);
550 
551 	if (finet) {
552 		if (SecureMode) {
553 			for (i = 0; i < *finet; i++) {
554 				if (shutdown(finet[i+1], SHUT_RD) < 0) {
555 					logerror("shutdown");
556 					if (!Debug)
557 						die(0);
558 				}
559 			}
560 		} else {
561 			dprintf("listening on inet and/or inet6 socket\n");
562 		}
563 		dprintf("sending on inet and/or inet6 socket\n");
564 	}
565 
566 	if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
567 		if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
568 			fklog = -1;
569 	if (fklog < 0)
570 		dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
571 
572 	/* tuck my process id away */
573 	pidfile_write(pfh);
574 
575 	dprintf("off & running....\n");
576 
577 	init(0);
578 	/* prevent SIGHUP and SIGCHLD handlers from running in parallel */
579 	sigemptyset(&mask);
580 	sigaddset(&mask, SIGCHLD);
581 	sact.sa_handler = init;
582 	sact.sa_mask = mask;
583 	sact.sa_flags = SA_RESTART;
584 	(void)sigaction(SIGHUP, &sact, NULL);
585 
586 	tvp = &tv;
587 	tv.tv_sec = tv.tv_usec = 0;
588 
589 	if (fklog != -1 && fklog > fdsrmax)
590 		fdsrmax = fklog;
591 	if (finet && !SecureMode) {
592 		for (i = 0; i < *finet; i++) {
593 		    if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
594 			fdsrmax = finet[i+1];
595 		}
596 	}
597 	STAILQ_FOREACH(fx, &funixes, next)
598 		if (fx->s > fdsrmax)
599 			fdsrmax = fx->s;
600 
601 	fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
602 	    sizeof(fd_mask));
603 	if (fdsr == NULL)
604 		errx(1, "calloc fd_set");
605 
606 	for (;;) {
607 		if (MarkSet)
608 			markit();
609 		if (WantDie)
610 			die(WantDie);
611 
612 		bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
613 		    sizeof(fd_mask));
614 
615 		if (fklog != -1)
616 			FD_SET(fklog, fdsr);
617 		if (finet && !SecureMode) {
618 			for (i = 0; i < *finet; i++) {
619 				if (finet[i+1] != -1)
620 					FD_SET(finet[i+1], fdsr);
621 			}
622 		}
623 		STAILQ_FOREACH(fx, &funixes, next)
624 			FD_SET(fx->s, fdsr);
625 
626 		i = select(fdsrmax+1, fdsr, NULL, NULL,
627 		    needdofsync ? &tv : tvp);
628 		switch (i) {
629 		case 0:
630 			dofsync();
631 			needdofsync = 0;
632 			if (tvp) {
633 				tvp = NULL;
634 				if (ppid != 1)
635 					kill(ppid, SIGALRM);
636 			}
637 			continue;
638 		case -1:
639 			if (errno != EINTR)
640 				logerror("select");
641 			continue;
642 		}
643 		if (fklog != -1 && FD_ISSET(fklog, fdsr))
644 			readklog();
645 		if (finet && !SecureMode) {
646 			for (i = 0; i < *finet; i++) {
647 				if (FD_ISSET(finet[i+1], fdsr)) {
648 					len = sizeof(frominet);
649 					l = recvfrom(finet[i+1], line, MAXLINE,
650 					     0, (struct sockaddr *)&frominet,
651 					     &len);
652 					if (l > 0) {
653 						line[l] = '\0';
654 						hname = cvthname((struct sockaddr *)&frominet);
655 						unmapped((struct sockaddr *)&frominet);
656 						if (validate((struct sockaddr *)&frominet, hname))
657 							printline(hname, line, RemoteAddDate ? ADDDATE : 0);
658 					} else if (l < 0 && errno != EINTR)
659 						logerror("recvfrom inet");
660 				}
661 			}
662 		}
663 		STAILQ_FOREACH(fx, &funixes, next) {
664 			if (FD_ISSET(fx->s, fdsr)) {
665 				len = sizeof(fromunix);
666 				l = recvfrom(fx->s, line, MAXLINE, 0,
667 				    (struct sockaddr *)&fromunix, &len);
668 				if (l > 0) {
669 					line[l] = '\0';
670 					printline(LocalHostName, line, 0);
671 				} else if (l < 0 && errno != EINTR)
672 					logerror("recvfrom unix");
673 			}
674 		}
675 	}
676 	if (fdsr)
677 		free(fdsr);
678 }
679 
680 static void
681 unmapped(struct sockaddr *sa)
682 {
683 	struct sockaddr_in6 *sin6;
684 	struct sockaddr_in sin4;
685 
686 	if (sa->sa_family != AF_INET6)
687 		return;
688 	if (sa->sa_len != sizeof(struct sockaddr_in6) ||
689 	    sizeof(sin4) > sa->sa_len)
690 		return;
691 	sin6 = (struct sockaddr_in6 *)sa;
692 	if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
693 		return;
694 
695 	memset(&sin4, 0, sizeof(sin4));
696 	sin4.sin_family = AF_INET;
697 	sin4.sin_len = sizeof(struct sockaddr_in);
698 	memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
699 	       sizeof(sin4.sin_addr));
700 	sin4.sin_port = sin6->sin6_port;
701 
702 	memcpy(sa, &sin4, sin4.sin_len);
703 }
704 
705 static void
706 usage(void)
707 {
708 
709 	fprintf(stderr, "%s\n%s\n%s\n%s\n",
710 		"usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]",
711 		"               [-b bind_address] [-f config_file]",
712 		"               [-l [mode:]path] [-m mark_interval]",
713 		"               [-P pid_file] [-p log_socket]");
714 	exit(1);
715 }
716 
717 /*
718  * Take a raw input line, decode the message, and print the message
719  * on the appropriate log files.
720  */
721 static void
722 printline(const char *hname, char *msg, int flags)
723 {
724 	char *p, *q;
725 	long n;
726 	int c, pri;
727 	char line[MAXLINE + 1];
728 
729 	/* test for special codes */
730 	p = msg;
731 	pri = DEFUPRI;
732 	if (*p == '<') {
733 		errno = 0;
734 		n = strtol(p + 1, &q, 10);
735 		if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
736 			p = q + 1;
737 			pri = n;
738 		}
739 	}
740 	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
741 		pri = DEFUPRI;
742 
743 	/*
744 	 * Don't allow users to log kernel messages.
745 	 * NOTE: since LOG_KERN == 0 this will also match
746 	 *       messages with no facility specified.
747 	 */
748 	if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
749 		pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
750 
751 	q = line;
752 
753 	while ((c = (unsigned char)*p++) != '\0' &&
754 	    q < &line[sizeof(line) - 4]) {
755 		if (mask_C1 && (c & 0x80) && c < 0xA0) {
756 			c &= 0x7F;
757 			*q++ = 'M';
758 			*q++ = '-';
759 		}
760 		if (isascii(c) && iscntrl(c)) {
761 			if (c == '\n') {
762 				*q++ = ' ';
763 			} else if (c == '\t') {
764 				*q++ = '\t';
765 			} else {
766 				*q++ = '^';
767 				*q++ = c ^ 0100;
768 			}
769 		} else {
770 			*q++ = c;
771 		}
772 	}
773 	*q = '\0';
774 
775 	logmsg(pri, line, hname, flags);
776 }
777 
778 /*
779  * Read /dev/klog while data are available, split into lines.
780  */
781 static void
782 readklog(void)
783 {
784 	char *p, *q, line[MAXLINE + 1];
785 	int len, i;
786 
787 	len = 0;
788 	for (;;) {
789 		i = read(fklog, line + len, MAXLINE - 1 - len);
790 		if (i > 0) {
791 			line[i + len] = '\0';
792 		} else {
793 			if (i < 0 && errno != EINTR && errno != EAGAIN) {
794 				logerror("klog");
795 				fklog = -1;
796 			}
797 			break;
798 		}
799 
800 		for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
801 			*q = '\0';
802 			printsys(p);
803 		}
804 		len = strlen(p);
805 		if (len >= MAXLINE - 1) {
806 			printsys(p);
807 			len = 0;
808 		}
809 		if (len > 0)
810 			memmove(line, p, len + 1);
811 	}
812 	if (len > 0)
813 		printsys(line);
814 }
815 
816 /*
817  * Take a raw input line from /dev/klog, format similar to syslog().
818  */
819 static void
820 printsys(char *msg)
821 {
822 	char *p, *q;
823 	long n;
824 	int flags, isprintf, pri;
825 
826 	flags = ISKERNEL | SYNC_FILE | ADDDATE;	/* fsync after write */
827 	p = msg;
828 	pri = DEFSPRI;
829 	isprintf = 1;
830 	if (*p == '<') {
831 		errno = 0;
832 		n = strtol(p + 1, &q, 10);
833 		if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
834 			p = q + 1;
835 			pri = n;
836 			isprintf = 0;
837 		}
838 	}
839 	/*
840 	 * Kernel printf's and LOG_CONSOLE messages have been displayed
841 	 * on the console already.
842 	 */
843 	if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
844 		flags |= IGN_CONS;
845 	if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
846 		pri = DEFSPRI;
847 	logmsg(pri, p, LocalHostName, flags);
848 }
849 
850 static time_t	now;
851 
852 /*
853  * Match a program or host name against a specification.
854  * Return a non-0 value if the message must be ignored
855  * based on the specification.
856  */
857 static int
858 skip_message(const char *name, const char *spec, int checkcase)
859 {
860 	const char *s;
861 	char prev, next;
862 	int exclude = 0;
863 	/* Behaviour on explicit match */
864 
865 	if (spec == NULL)
866 		return 0;
867 	switch (*spec) {
868 	case '-':
869 		exclude = 1;
870 		/*FALLTHROUGH*/
871 	case '+':
872 		spec++;
873 		break;
874 	default:
875 		break;
876 	}
877 	if (checkcase)
878 		s = strstr (spec, name);
879 	else
880 		s = strcasestr (spec, name);
881 
882 	if (s != NULL) {
883 		prev = (s == spec ? ',' : *(s - 1));
884 		next = *(s + strlen (name));
885 
886 		if (prev == ',' && (next == '\0' || next == ','))
887 			/* Explicit match: skip iff the spec is an
888 			   exclusive one. */
889 			return exclude;
890 	}
891 
892 	/* No explicit match for this name: skip the message iff
893 	   the spec is an inclusive one. */
894 	return !exclude;
895 }
896 
897 /*
898  * Log a message to the appropriate log files, users, etc. based on
899  * the priority.
900  */
901 static void
902 logmsg(int pri, const char *msg, const char *from, int flags)
903 {
904 	struct filed *f;
905 	int i, fac, msglen, omask, prilev;
906 	const char *timestamp;
907  	char prog[NAME_MAX+1];
908 	char buf[MAXLINE+1];
909 
910 	dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
911 	    pri, flags, from, msg);
912 
913 	omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
914 
915 	/*
916 	 * Check to see if msg looks non-standard.
917 	 */
918 	msglen = strlen(msg);
919 	if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
920 	    msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
921 		flags |= ADDDATE;
922 
923 	(void)time(&now);
924 	if (flags & ADDDATE) {
925 		timestamp = ctime(&now) + 4;
926 	} else {
927 		timestamp = msg;
928 		msg += 16;
929 		msglen -= 16;
930 	}
931 
932 	/* skip leading blanks */
933 	while (isspace(*msg)) {
934 		msg++;
935 		msglen--;
936 	}
937 
938 	/* extract facility and priority level */
939 	if (flags & MARK)
940 		fac = LOG_NFACILITIES;
941 	else
942 		fac = LOG_FAC(pri);
943 
944 	/* Check maximum facility number. */
945 	if (fac > LOG_NFACILITIES) {
946 		(void)sigsetmask(omask);
947 		return;
948 	}
949 
950 	prilev = LOG_PRI(pri);
951 
952 	/* extract program name */
953 	for (i = 0; i < NAME_MAX; i++) {
954 		if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
955 		    msg[i] == '/' || isspace(msg[i]))
956 			break;
957 		prog[i] = msg[i];
958 	}
959 	prog[i] = 0;
960 
961 	/* add kernel prefix for kernel messages */
962 	if (flags & ISKERNEL) {
963 		snprintf(buf, sizeof(buf), "%s: %s",
964 		    use_bootfile ? bootfile : "kernel", msg);
965 		msg = buf;
966 		msglen = strlen(buf);
967 	}
968 
969 	/* log the message to the particular outputs */
970 	if (!Initialized) {
971 		f = &consfile;
972 		/*
973 		 * Open in non-blocking mode to avoid hangs during open
974 		 * and close(waiting for the port to drain).
975 		 */
976 		f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
977 
978 		if (f->f_file >= 0) {
979 			(void)strlcpy(f->f_lasttime, timestamp,
980 				sizeof(f->f_lasttime));
981 			fprintlog(f, flags, msg);
982 			(void)close(f->f_file);
983 		}
984 		(void)sigsetmask(omask);
985 		return;
986 	}
987 	for (f = Files; f; f = f->f_next) {
988 		/* skip messages that are incorrect priority */
989 		if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
990 		     ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
991 		     ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
992 		     )
993 		    || f->f_pmask[fac] == INTERNAL_NOPRI)
994 			continue;
995 
996 		/* skip messages with the incorrect hostname */
997 		if (skip_message(from, f->f_host, 0))
998 			continue;
999 
1000 		/* skip messages with the incorrect program name */
1001 		if (skip_message(prog, f->f_program, 1))
1002 			continue;
1003 
1004 		/* skip message to console if it has already been printed */
1005 		if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1006 			continue;
1007 
1008 		/* don't output marks to recently written files */
1009 		if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1010 			continue;
1011 
1012 		/*
1013 		 * suppress duplicate lines to this file
1014 		 */
1015 		if (no_compress - (f->f_type != F_PIPE) < 1 &&
1016 		    (flags & MARK) == 0 && msglen == f->f_prevlen &&
1017 		    f->f_prevline && !strcmp(msg, f->f_prevline) &&
1018 		    !strcasecmp(from, f->f_prevhost)) {
1019 			(void)strlcpy(f->f_lasttime, timestamp,
1020 				sizeof(f->f_lasttime));
1021 			f->f_prevcount++;
1022 			dprintf("msg repeated %d times, %ld sec of %d\n",
1023 			    f->f_prevcount, (long)(now - f->f_time),
1024 			    repeatinterval[f->f_repeatcount]);
1025 			/*
1026 			 * If domark would have logged this by now,
1027 			 * flush it now (so we don't hold isolated messages),
1028 			 * but back off so we'll flush less often
1029 			 * in the future.
1030 			 */
1031 			if (now > REPEATTIME(f)) {
1032 				fprintlog(f, flags, (char *)NULL);
1033 				BACKOFF(f);
1034 			}
1035 		} else {
1036 			/* new line, save it */
1037 			if (f->f_prevcount)
1038 				fprintlog(f, 0, (char *)NULL);
1039 			f->f_repeatcount = 0;
1040 			f->f_prevpri = pri;
1041 			(void)strlcpy(f->f_lasttime, timestamp,
1042 				sizeof(f->f_lasttime));
1043 			(void)strlcpy(f->f_prevhost, from,
1044 			    sizeof(f->f_prevhost));
1045 			if (msglen < MAXSVLINE) {
1046 				f->f_prevlen = msglen;
1047 				(void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
1048 				fprintlog(f, flags, (char *)NULL);
1049 			} else {
1050 				f->f_prevline[0] = 0;
1051 				f->f_prevlen = 0;
1052 				fprintlog(f, flags, msg);
1053 			}
1054 		}
1055 	}
1056 	(void)sigsetmask(omask);
1057 }
1058 
1059 static void
1060 dofsync(void)
1061 {
1062 	struct filed *f;
1063 
1064 	for (f = Files; f; f = f->f_next) {
1065 		if ((f->f_type == F_FILE) &&
1066 		    (f->f_flags & FFLAG_NEEDSYNC)) {
1067 			f->f_flags &= ~FFLAG_NEEDSYNC;
1068 			(void)fsync(f->f_file);
1069 		}
1070 	}
1071 }
1072 
1073 #define IOV_SIZE 7
1074 static void
1075 fprintlog(struct filed *f, int flags, const char *msg)
1076 {
1077 	struct iovec iov[IOV_SIZE];
1078 	struct iovec *v;
1079 	struct addrinfo *r;
1080 	int i, l, lsent = 0;
1081 	char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
1082 	char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
1083 	const char *msgret;
1084 
1085 	v = iov;
1086 	if (f->f_type == F_WALL) {
1087 		v->iov_base = greetings;
1088 		/* The time displayed is not synchornized with the other log
1089 		 * destinations (like messages).  Following fragment was using
1090 		 * ctime(&now), which was updating the time every 30 sec.
1091 		 * With f_lasttime, time is synchronized correctly.
1092 		 */
1093 		v->iov_len = snprintf(greetings, sizeof greetings,
1094 		    "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
1095 		    f->f_prevhost, f->f_lasttime);
1096 		if (v->iov_len > 0)
1097 			v++;
1098 		v->iov_base = nul;
1099 		v->iov_len = 0;
1100 		v++;
1101 	} else {
1102 		v->iov_base = f->f_lasttime;
1103 		v->iov_len = strlen(f->f_lasttime);
1104 		v++;
1105 		v->iov_base = space;
1106 		v->iov_len = 1;
1107 		v++;
1108 	}
1109 
1110 	if (LogFacPri) {
1111 	  	static char fp_buf[30];	/* Hollow laugh */
1112 		int fac = f->f_prevpri & LOG_FACMASK;
1113 		int pri = LOG_PRI(f->f_prevpri);
1114 		const char *f_s = NULL;
1115 		char f_n[5];	/* Hollow laugh */
1116 		const char *p_s = NULL;
1117 		char p_n[5];	/* Hollow laugh */
1118 
1119 		if (LogFacPri > 1) {
1120 		  CODE *c;
1121 
1122 		  for (c = facilitynames; c->c_name; c++) {
1123 		    if (c->c_val == fac) {
1124 		      f_s = c->c_name;
1125 		      break;
1126 		    }
1127 		  }
1128 		  for (c = prioritynames; c->c_name; c++) {
1129 		    if (c->c_val == pri) {
1130 		      p_s = c->c_name;
1131 		      break;
1132 		    }
1133 		  }
1134 		}
1135 		if (!f_s) {
1136 		  snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1137 		  f_s = f_n;
1138 		}
1139 		if (!p_s) {
1140 		  snprintf(p_n, sizeof p_n, "%d", pri);
1141 		  p_s = p_n;
1142 		}
1143 		snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
1144 		v->iov_base = fp_buf;
1145 		v->iov_len = strlen(fp_buf);
1146 	} else {
1147 		v->iov_base = nul;
1148 		v->iov_len = 0;
1149 	}
1150 	v++;
1151 
1152 	v->iov_base = f->f_prevhost;
1153 	v->iov_len = strlen(v->iov_base);
1154 	v++;
1155 	v->iov_base = space;
1156 	v->iov_len = 1;
1157 	v++;
1158 
1159 	if (msg) {
1160 		wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1161 		if (wmsg == NULL) {
1162 			logerror("strdup");
1163 			exit(1);
1164 		}
1165 		v->iov_base = wmsg;
1166 		v->iov_len = strlen(msg);
1167 	} else if (f->f_prevcount > 1) {
1168 		v->iov_base = repbuf;
1169 		v->iov_len = snprintf(repbuf, sizeof repbuf,
1170 		    "last message repeated %d times", f->f_prevcount);
1171 	} else if (f->f_prevline) {
1172 		v->iov_base = f->f_prevline;
1173 		v->iov_len = f->f_prevlen;
1174 	} else {
1175 		return;
1176 	}
1177 	v++;
1178 
1179 	dprintf("Logging to %s", TypeNames[f->f_type]);
1180 	f->f_time = now;
1181 
1182 	switch (f->f_type) {
1183 		int port;
1184 	case F_UNUSED:
1185 		dprintf("\n");
1186 		break;
1187 
1188 	case F_FORW:
1189 		port = (int)ntohs(((struct sockaddr_in *)
1190 			    (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1191 		if (port != 514) {
1192 			dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port);
1193 		} else {
1194 			dprintf(" %s\n", f->f_un.f_forw.f_hname);
1195 		}
1196 		/* check for local vs remote messages */
1197 		if (strcasecmp(f->f_prevhost, LocalHostName))
1198 			l = snprintf(line, sizeof line - 1,
1199 			    "<%d>%.15s Forwarded from %s: %s",
1200 			    f->f_prevpri, (char *)iov[0].iov_base,
1201 			    f->f_prevhost, (char *)iov[5].iov_base);
1202 		else
1203 			l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1204 			     f->f_prevpri, (char *)iov[0].iov_base,
1205 			    (char *)iov[5].iov_base);
1206 		if (l < 0)
1207 			l = 0;
1208 		else if (l > MAXLINE)
1209 			l = MAXLINE;
1210 
1211 		if (finet) {
1212 			for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1213 				for (i = 0; i < *finet; i++) {
1214 #if 0
1215 					/*
1216 					 * should we check AF first, or just
1217 					 * trial and error? FWD
1218 					 */
1219 					if (r->ai_family ==
1220 					    address_family_of(finet[i+1]))
1221 #endif
1222 					lsent = sendto(finet[i+1], line, l, 0,
1223 					    r->ai_addr, r->ai_addrlen);
1224 					if (lsent == l)
1225 						break;
1226 				}
1227 				if (lsent == l && !send_to_all)
1228 					break;
1229 			}
1230 			dprintf("lsent/l: %d/%d\n", lsent, l);
1231 			if (lsent != l) {
1232 				int e = errno;
1233 				logerror("sendto");
1234 				errno = e;
1235 				switch (errno) {
1236 				case ENOBUFS:
1237 				case ENETDOWN:
1238 				case EHOSTUNREACH:
1239 				case EHOSTDOWN:
1240 					break;
1241 				/* case EBADF: */
1242 				/* case EACCES: */
1243 				/* case ENOTSOCK: */
1244 				/* case EFAULT: */
1245 				/* case EMSGSIZE: */
1246 				/* case EAGAIN: */
1247 				/* case ENOBUFS: */
1248 				/* case ECONNREFUSED: */
1249 				default:
1250 					dprintf("removing entry\n");
1251 					f->f_type = F_UNUSED;
1252 					break;
1253 				}
1254 			}
1255 		}
1256 		break;
1257 
1258 	case F_FILE:
1259 		dprintf(" %s\n", f->f_un.f_fname);
1260 		v->iov_base = lf;
1261 		v->iov_len = 1;
1262 		if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1263 			/*
1264 			 * If writev(2) fails for potentially transient errors
1265 			 * like the filesystem being full, ignore it.
1266 			 * Otherwise remove this logfile from the list.
1267 			 */
1268 			if (errno != ENOSPC) {
1269 				int e = errno;
1270 				(void)close(f->f_file);
1271 				f->f_type = F_UNUSED;
1272 				errno = e;
1273 				logerror(f->f_un.f_fname);
1274 			}
1275 		} else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1276 			f->f_flags |= FFLAG_NEEDSYNC;
1277 			needdofsync = 1;
1278 		}
1279 		break;
1280 
1281 	case F_PIPE:
1282 		dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1283 		v->iov_base = lf;
1284 		v->iov_len = 1;
1285 		if (f->f_un.f_pipe.f_pid == 0) {
1286 			if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1287 						&f->f_un.f_pipe.f_pid)) < 0) {
1288 				f->f_type = F_UNUSED;
1289 				logerror(f->f_un.f_pipe.f_pname);
1290 				break;
1291 			}
1292 		}
1293 		if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1294 			int e = errno;
1295 			(void)close(f->f_file);
1296 			if (f->f_un.f_pipe.f_pid > 0)
1297 				deadq_enter(f->f_un.f_pipe.f_pid,
1298 					    f->f_un.f_pipe.f_pname);
1299 			f->f_un.f_pipe.f_pid = 0;
1300 			errno = e;
1301 			logerror(f->f_un.f_pipe.f_pname);
1302 		}
1303 		break;
1304 
1305 	case F_CONSOLE:
1306 		if (flags & IGN_CONS) {
1307 			dprintf(" (ignored)\n");
1308 			break;
1309 		}
1310 		/* FALLTHROUGH */
1311 
1312 	case F_TTY:
1313 		dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1314 		v->iov_base = crlf;
1315 		v->iov_len = 2;
1316 
1317 		errno = 0;	/* ttymsg() only sometimes returns an errno */
1318 		if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) {
1319 			f->f_type = F_UNUSED;
1320 			logerror(msgret);
1321 		}
1322 		break;
1323 
1324 	case F_USERS:
1325 	case F_WALL:
1326 		dprintf("\n");
1327 		v->iov_base = crlf;
1328 		v->iov_len = 2;
1329 		wallmsg(f, iov, IOV_SIZE);
1330 		break;
1331 	}
1332 	f->f_prevcount = 0;
1333 	free(wmsg);
1334 }
1335 
1336 /*
1337  *  WALLMSG -- Write a message to the world at large
1338  *
1339  *	Write the specified message to either the entire
1340  *	world, or a list of approved users.
1341  */
1342 static void
1343 wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1344 {
1345 	static int reenter;			/* avoid calling ourselves */
1346 	struct utmpx *ut;
1347 	int i;
1348 	const char *p;
1349 
1350 	if (reenter++)
1351 		return;
1352 	setutxent();
1353 	/* NOSTRICT */
1354 	while ((ut = getutxent()) != NULL) {
1355 		if (ut->ut_type != USER_PROCESS)
1356 			continue;
1357 		if (f->f_type == F_WALL) {
1358 			if ((p = ttymsg(iov, iovlen, ut->ut_line,
1359 			    TTYMSGTIME)) != NULL) {
1360 				errno = 0;	/* already in msg */
1361 				logerror(p);
1362 			}
1363 			continue;
1364 		}
1365 		/* should we send the message to this user? */
1366 		for (i = 0; i < MAXUNAMES; i++) {
1367 			if (!f->f_un.f_uname[i][0])
1368 				break;
1369 			if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) {
1370 				if ((p = ttymsg(iov, iovlen, ut->ut_line,
1371 				    TTYMSGTIME)) != NULL) {
1372 					errno = 0;	/* already in msg */
1373 					logerror(p);
1374 				}
1375 				break;
1376 			}
1377 		}
1378 	}
1379 	endutxent();
1380 	reenter = 0;
1381 }
1382 
1383 static void
1384 reapchild(int signo __unused)
1385 {
1386 	int status;
1387 	pid_t pid;
1388 	struct filed *f;
1389 
1390 	while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1391 		if (!Initialized)
1392 			/* Don't tell while we are initting. */
1393 			continue;
1394 
1395 		/* First, look if it's a process from the dead queue. */
1396 		if (deadq_remove(pid))
1397 			goto oncemore;
1398 
1399 		/* Now, look in list of active processes. */
1400 		for (f = Files; f; f = f->f_next)
1401 			if (f->f_type == F_PIPE &&
1402 			    f->f_un.f_pipe.f_pid == pid) {
1403 				(void)close(f->f_file);
1404 				f->f_un.f_pipe.f_pid = 0;
1405 				log_deadchild(pid, status,
1406 					      f->f_un.f_pipe.f_pname);
1407 				break;
1408 			}
1409 	  oncemore:
1410 		continue;
1411 	}
1412 }
1413 
1414 /*
1415  * Return a printable representation of a host address.
1416  */
1417 static const char *
1418 cvthname(struct sockaddr *f)
1419 {
1420 	int error, hl;
1421 	sigset_t omask, nmask;
1422 	static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1423 
1424 	error = getnameinfo((struct sockaddr *)f,
1425 			    ((struct sockaddr *)f)->sa_len,
1426 			    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
1427 	dprintf("cvthname(%s)\n", ip);
1428 
1429 	if (error) {
1430 		dprintf("Malformed from address %s\n", gai_strerror(error));
1431 		return ("???");
1432 	}
1433 	if (!resolve)
1434 		return (ip);
1435 
1436 	sigemptyset(&nmask);
1437 	sigaddset(&nmask, SIGHUP);
1438 	sigprocmask(SIG_BLOCK, &nmask, &omask);
1439 	error = getnameinfo((struct sockaddr *)f,
1440 			    ((struct sockaddr *)f)->sa_len,
1441 			    hname, sizeof hname, NULL, 0, NI_NAMEREQD);
1442 	sigprocmask(SIG_SETMASK, &omask, NULL);
1443 	if (error) {
1444 		dprintf("Host name for your address (%s) unknown\n", ip);
1445 		return (ip);
1446 	}
1447 	hl = strlen(hname);
1448 	if (hl > 0 && hname[hl-1] == '.')
1449 		hname[--hl] = '\0';
1450 	trimdomain(hname, hl);
1451 	return (hname);
1452 }
1453 
1454 static void
1455 dodie(int signo)
1456 {
1457 
1458 	WantDie = signo;
1459 }
1460 
1461 static void
1462 domark(int signo __unused)
1463 {
1464 
1465 	MarkSet = 1;
1466 }
1467 
1468 /*
1469  * Print syslogd errors some place.
1470  */
1471 static void
1472 logerror(const char *type)
1473 {
1474 	char buf[512];
1475 	static int recursed = 0;
1476 
1477 	/* If there's an error while trying to log an error, give up. */
1478 	if (recursed)
1479 		return;
1480 	recursed++;
1481 	if (errno)
1482 		(void)snprintf(buf,
1483 		    sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1484 	else
1485 		(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1486 	errno = 0;
1487 	dprintf("%s\n", buf);
1488 	logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1489 	recursed--;
1490 }
1491 
1492 static void
1493 die(int signo)
1494 {
1495 	struct filed *f;
1496 	struct funix *fx;
1497 	int was_initialized;
1498 	char buf[100];
1499 
1500 	was_initialized = Initialized;
1501 	Initialized = 0;	/* Don't log SIGCHLDs. */
1502 	for (f = Files; f != NULL; f = f->f_next) {
1503 		/* flush any pending output */
1504 		if (f->f_prevcount)
1505 			fprintlog(f, 0, (char *)NULL);
1506 		if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) {
1507 			(void)close(f->f_file);
1508 			f->f_un.f_pipe.f_pid = 0;
1509 		}
1510 	}
1511 	Initialized = was_initialized;
1512 	if (signo) {
1513 		dprintf("syslogd: exiting on signal %d\n", signo);
1514 		(void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1515 		errno = 0;
1516 		logerror(buf);
1517 	}
1518 	STAILQ_FOREACH(fx, &funixes, next)
1519 		(void)unlink(fx->name);
1520 	pidfile_remove(pfh);
1521 
1522 	exit(1);
1523 }
1524 
1525 /*
1526  *  INIT -- Initialize syslogd from configuration table
1527  */
1528 static void
1529 init(int signo)
1530 {
1531 	int i;
1532 	FILE *cf;
1533 	struct filed *f, *next, **nextp;
1534 	char *p;
1535 	char cline[LINE_MAX];
1536  	char prog[NAME_MAX+1];
1537 	char host[MAXHOSTNAMELEN];
1538 	char oldLocalHostName[MAXHOSTNAMELEN];
1539 	char hostMsg[2*MAXHOSTNAMELEN+40];
1540 	char bootfileMsg[LINE_MAX];
1541 
1542 	dprintf("init\n");
1543 
1544 	/*
1545 	 * Load hostname (may have changed).
1546 	 */
1547 	if (signo != 0)
1548 		(void)strlcpy(oldLocalHostName, LocalHostName,
1549 		    sizeof(oldLocalHostName));
1550 	if (gethostname(LocalHostName, sizeof(LocalHostName)))
1551 		err(EX_OSERR, "gethostname() failed");
1552 	if ((p = strchr(LocalHostName, '.')) != NULL) {
1553 		*p++ = '\0';
1554 		LocalDomain = p;
1555 	} else {
1556 		LocalDomain = "";
1557 	}
1558 
1559 	/*
1560 	 *  Close all open log files.
1561 	 */
1562 	Initialized = 0;
1563 	for (f = Files; f != NULL; f = next) {
1564 		/* flush any pending output */
1565 		if (f->f_prevcount)
1566 			fprintlog(f, 0, (char *)NULL);
1567 
1568 		switch (f->f_type) {
1569 		case F_FILE:
1570 		case F_FORW:
1571 		case F_CONSOLE:
1572 		case F_TTY:
1573 			(void)close(f->f_file);
1574 			break;
1575 		case F_PIPE:
1576 			if (f->f_un.f_pipe.f_pid > 0) {
1577 				(void)close(f->f_file);
1578 				deadq_enter(f->f_un.f_pipe.f_pid,
1579 					    f->f_un.f_pipe.f_pname);
1580 			}
1581 			f->f_un.f_pipe.f_pid = 0;
1582 			break;
1583 		}
1584 		next = f->f_next;
1585 		if (f->f_program) free(f->f_program);
1586 		if (f->f_host) free(f->f_host);
1587 		free((char *)f);
1588 	}
1589 	Files = NULL;
1590 	nextp = &Files;
1591 
1592 	/* open the configuration file */
1593 	if ((cf = fopen(ConfFile, "r")) == NULL) {
1594 		dprintf("cannot open %s\n", ConfFile);
1595 		*nextp = (struct filed *)calloc(1, sizeof(*f));
1596 		if (*nextp == NULL) {
1597 			logerror("calloc");
1598 			exit(1);
1599 		}
1600 		cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1601 		(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1602 		if ((*nextp)->f_next == NULL) {
1603 			logerror("calloc");
1604 			exit(1);
1605 		}
1606 		cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1607 		Initialized = 1;
1608 		return;
1609 	}
1610 
1611 	/*
1612 	 *  Foreach line in the conf table, open that file.
1613 	 */
1614 	f = NULL;
1615 	(void)strlcpy(host, "*", sizeof(host));
1616 	(void)strlcpy(prog, "*", sizeof(prog));
1617 	while (fgets(cline, sizeof(cline), cf) != NULL) {
1618 		/*
1619 		 * check for end-of-section, comments, strip off trailing
1620 		 * spaces and newline character. #!prog is treated specially:
1621 		 * following lines apply only to that program.
1622 		 */
1623 		for (p = cline; isspace(*p); ++p)
1624 			continue;
1625 		if (*p == 0)
1626 			continue;
1627 		if (*p == '#') {
1628 			p++;
1629 			if (*p != '!' && *p != '+' && *p != '-')
1630 				continue;
1631 		}
1632 		if (*p == '+' || *p == '-') {
1633 			host[0] = *p++;
1634 			while (isspace(*p))
1635 				p++;
1636 			if ((!*p) || (*p == '*')) {
1637 				(void)strlcpy(host, "*", sizeof(host));
1638 				continue;
1639 			}
1640 			if (*p == '@')
1641 				p = LocalHostName;
1642 			for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1643 				if (!isalnum(*p) && *p != '.' && *p != '-'
1644 				    && *p != ',' && *p != ':' && *p != '%')
1645 					break;
1646 				host[i] = *p++;
1647 			}
1648 			host[i] = '\0';
1649 			continue;
1650 		}
1651 		if (*p == '!') {
1652 			p++;
1653 			while (isspace(*p)) p++;
1654 			if ((!*p) || (*p == '*')) {
1655 				(void)strlcpy(prog, "*", sizeof(prog));
1656 				continue;
1657 			}
1658 			for (i = 0; i < NAME_MAX; i++) {
1659 				if (!isprint(p[i]) || isspace(p[i]))
1660 					break;
1661 				prog[i] = p[i];
1662 			}
1663 			prog[i] = 0;
1664 			continue;
1665 		}
1666 		for (p = cline + 1; *p != '\0'; p++) {
1667 			if (*p != '#')
1668 				continue;
1669 			if (*(p - 1) == '\\') {
1670 				strcpy(p - 1, p);
1671 				p--;
1672 				continue;
1673 			}
1674 			*p = '\0';
1675 			break;
1676 		}
1677 		for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1678 			cline[i] = '\0';
1679 		f = (struct filed *)calloc(1, sizeof(*f));
1680 		if (f == NULL) {
1681 			logerror("calloc");
1682 			exit(1);
1683 		}
1684 		*nextp = f;
1685 		nextp = &f->f_next;
1686 		cfline(cline, f, prog, host);
1687 	}
1688 
1689 	/* close the configuration file */
1690 	(void)fclose(cf);
1691 
1692 	Initialized = 1;
1693 
1694 	if (Debug) {
1695 		int port;
1696 		for (f = Files; f; f = f->f_next) {
1697 			for (i = 0; i <= LOG_NFACILITIES; i++)
1698 				if (f->f_pmask[i] == INTERNAL_NOPRI)
1699 					printf("X ");
1700 				else
1701 					printf("%d ", f->f_pmask[i]);
1702 			printf("%s: ", TypeNames[f->f_type]);
1703 			switch (f->f_type) {
1704 			case F_FILE:
1705 				printf("%s", f->f_un.f_fname);
1706 				break;
1707 
1708 			case F_CONSOLE:
1709 			case F_TTY:
1710 				printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1711 				break;
1712 
1713 			case F_FORW:
1714 				port = (int)ntohs(((struct sockaddr_in *)
1715 				    (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1716 				if (port != 514) {
1717 					printf("%s:%d",
1718 						f->f_un.f_forw.f_hname, port);
1719 				} else {
1720 					printf("%s", f->f_un.f_forw.f_hname);
1721 				}
1722 				break;
1723 
1724 			case F_PIPE:
1725 				printf("%s", f->f_un.f_pipe.f_pname);
1726 				break;
1727 
1728 			case F_USERS:
1729 				for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1730 					printf("%s, ", f->f_un.f_uname[i]);
1731 				break;
1732 			}
1733 			if (f->f_program)
1734 				printf(" (%s)", f->f_program);
1735 			printf("\n");
1736 		}
1737 	}
1738 
1739 	logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1740 	dprintf("syslogd: restarted\n");
1741 	/*
1742 	 * Log a change in hostname, but only on a restart.
1743 	 */
1744 	if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1745 		(void)snprintf(hostMsg, sizeof(hostMsg),
1746 		    "syslogd: hostname changed, \"%s\" to \"%s\"",
1747 		    oldLocalHostName, LocalHostName);
1748 		logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1749 		dprintf("%s\n", hostMsg);
1750 	}
1751 	/*
1752 	 * Log the kernel boot file if we aren't going to use it as
1753 	 * the prefix, and if this is *not* a restart.
1754 	 */
1755 	if (signo == 0 && !use_bootfile) {
1756 		(void)snprintf(bootfileMsg, sizeof(bootfileMsg),
1757 		    "syslogd: kernel boot file is %s", bootfile);
1758 		logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1759 		dprintf("%s\n", bootfileMsg);
1760 	}
1761 }
1762 
1763 /*
1764  * Crack a configuration file line
1765  */
1766 static void
1767 cfline(const char *line, struct filed *f, const char *prog, const char *host)
1768 {
1769 	struct addrinfo hints, *res;
1770 	int error, i, pri, syncfile;
1771 	const char *p, *q;
1772 	char *bp;
1773 	char buf[MAXLINE], ebuf[100];
1774 
1775 	dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1776 
1777 	errno = 0;	/* keep strerror() stuff out of logerror messages */
1778 
1779 	/* clear out file entry */
1780 	memset(f, 0, sizeof(*f));
1781 	for (i = 0; i <= LOG_NFACILITIES; i++)
1782 		f->f_pmask[i] = INTERNAL_NOPRI;
1783 
1784 	/* save hostname if any */
1785 	if (host && *host == '*')
1786 		host = NULL;
1787 	if (host) {
1788 		int hl;
1789 
1790 		f->f_host = strdup(host);
1791 		if (f->f_host == NULL) {
1792 			logerror("strdup");
1793 			exit(1);
1794 		}
1795 		hl = strlen(f->f_host);
1796 		if (hl > 0 && f->f_host[hl-1] == '.')
1797 			f->f_host[--hl] = '\0';
1798 		trimdomain(f->f_host, hl);
1799 	}
1800 
1801 	/* save program name if any */
1802 	if (prog && *prog == '*')
1803 		prog = NULL;
1804 	if (prog) {
1805 		f->f_program = strdup(prog);
1806 		if (f->f_program == NULL) {
1807 			logerror("strdup");
1808 			exit(1);
1809 		}
1810 	}
1811 
1812 	/* scan through the list of selectors */
1813 	for (p = line; *p && *p != '\t' && *p != ' ';) {
1814 		int pri_done;
1815 		int pri_cmp;
1816 		int pri_invert;
1817 
1818 		/* find the end of this facility name list */
1819 		for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1820 			continue;
1821 
1822 		/* get the priority comparison */
1823 		pri_cmp = 0;
1824 		pri_done = 0;
1825 		pri_invert = 0;
1826 		if (*q == '!') {
1827 			pri_invert = 1;
1828 			q++;
1829 		}
1830 		while (!pri_done) {
1831 			switch (*q) {
1832 			case '<':
1833 				pri_cmp |= PRI_LT;
1834 				q++;
1835 				break;
1836 			case '=':
1837 				pri_cmp |= PRI_EQ;
1838 				q++;
1839 				break;
1840 			case '>':
1841 				pri_cmp |= PRI_GT;
1842 				q++;
1843 				break;
1844 			default:
1845 				pri_done++;
1846 				break;
1847 			}
1848 		}
1849 
1850 		/* collect priority name */
1851 		for (bp = buf; *q && !strchr("\t,; ", *q); )
1852 			*bp++ = *q++;
1853 		*bp = '\0';
1854 
1855 		/* skip cruft */
1856 		while (strchr(",;", *q))
1857 			q++;
1858 
1859 		/* decode priority name */
1860 		if (*buf == '*') {
1861 			pri = LOG_PRIMASK;
1862 			pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1863 		} else {
1864 			/* Ignore trailing spaces. */
1865 			for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
1866 				buf[i] = '\0';
1867 
1868 			pri = decode(buf, prioritynames);
1869 			if (pri < 0) {
1870 				(void)snprintf(ebuf, sizeof ebuf,
1871 				    "unknown priority name \"%s\"", buf);
1872 				logerror(ebuf);
1873 				return;
1874 			}
1875 		}
1876 		if (!pri_cmp)
1877 			pri_cmp = (UniquePriority)
1878 				  ? (PRI_EQ)
1879 				  : (PRI_EQ | PRI_GT)
1880 				  ;
1881 		if (pri_invert)
1882 			pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
1883 
1884 		/* scan facilities */
1885 		while (*p && !strchr("\t.; ", *p)) {
1886 			for (bp = buf; *p && !strchr("\t,;. ", *p); )
1887 				*bp++ = *p++;
1888 			*bp = '\0';
1889 
1890 			if (*buf == '*') {
1891 				for (i = 0; i < LOG_NFACILITIES; i++) {
1892 					f->f_pmask[i] = pri;
1893 					f->f_pcmp[i] = pri_cmp;
1894 				}
1895 			} else {
1896 				i = decode(buf, facilitynames);
1897 				if (i < 0) {
1898 					(void)snprintf(ebuf, sizeof ebuf,
1899 					    "unknown facility name \"%s\"",
1900 					    buf);
1901 					logerror(ebuf);
1902 					return;
1903 				}
1904 				f->f_pmask[i >> 3] = pri;
1905 				f->f_pcmp[i >> 3] = pri_cmp;
1906 			}
1907 			while (*p == ',' || *p == ' ')
1908 				p++;
1909 		}
1910 
1911 		p = q;
1912 	}
1913 
1914 	/* skip to action part */
1915 	while (*p == '\t' || *p == ' ')
1916 		p++;
1917 
1918 	if (*p == '-') {
1919 		syncfile = 0;
1920 		p++;
1921 	} else
1922 		syncfile = 1;
1923 
1924 	switch (*p) {
1925 	case '@':
1926 		{
1927 			char *tp;
1928 			/*
1929 			 * scan forward to see if there is a port defined.
1930 			 * so we can't use strlcpy..
1931 			 */
1932 			i = sizeof(f->f_un.f_forw.f_hname);
1933 			tp = f->f_un.f_forw.f_hname;
1934 			p++;
1935 
1936 			while (*p && (*p != ':') && (i-- > 0)) {
1937 				*tp++ = *p++;
1938 			}
1939 			*tp = '\0';
1940 		}
1941 		/* See if we copied a domain and have a port */
1942 		if (*p == ':')
1943 			p++;
1944 		else
1945 			p = NULL;
1946 
1947 		memset(&hints, 0, sizeof(hints));
1948 		hints.ai_family = family;
1949 		hints.ai_socktype = SOCK_DGRAM;
1950 		error = getaddrinfo(f->f_un.f_forw.f_hname,
1951 				p ? p : "syslog", &hints, &res);
1952 		if (error) {
1953 			logerror(gai_strerror(error));
1954 			break;
1955 		}
1956 		f->f_un.f_forw.f_addr = res;
1957 		f->f_type = F_FORW;
1958 		break;
1959 
1960 	case '/':
1961 		if ((f->f_file = open(p, logflags, 0600)) < 0) {
1962 			f->f_type = F_UNUSED;
1963 			logerror(p);
1964 			break;
1965 		}
1966 		if (syncfile)
1967 			f->f_flags |= FFLAG_SYNC;
1968 		if (isatty(f->f_file)) {
1969 			if (strcmp(p, ctty) == 0)
1970 				f->f_type = F_CONSOLE;
1971 			else
1972 				f->f_type = F_TTY;
1973 			(void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
1974 			    sizeof(f->f_un.f_fname));
1975 		} else {
1976 			(void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
1977 			f->f_type = F_FILE;
1978 		}
1979 		break;
1980 
1981 	case '|':
1982 		f->f_un.f_pipe.f_pid = 0;
1983 		(void)strlcpy(f->f_un.f_pipe.f_pname, p + 1,
1984 		    sizeof(f->f_un.f_pipe.f_pname));
1985 		f->f_type = F_PIPE;
1986 		break;
1987 
1988 	case '*':
1989 		f->f_type = F_WALL;
1990 		break;
1991 
1992 	default:
1993 		for (i = 0; i < MAXUNAMES && *p; i++) {
1994 			for (q = p; *q && *q != ','; )
1995 				q++;
1996 			(void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1);
1997 			if ((q - p) >= MAXLOGNAME)
1998 				f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0';
1999 			else
2000 				f->f_un.f_uname[i][q - p] = '\0';
2001 			while (*q == ',' || *q == ' ')
2002 				q++;
2003 			p = q;
2004 		}
2005 		f->f_type = F_USERS;
2006 		break;
2007 	}
2008 }
2009 
2010 
2011 /*
2012  *  Decode a symbolic name to a numeric value
2013  */
2014 static int
2015 decode(const char *name, CODE *codetab)
2016 {
2017 	CODE *c;
2018 	char *p, buf[40];
2019 
2020 	if (isdigit(*name))
2021 		return (atoi(name));
2022 
2023 	for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2024 		if (isupper(*name))
2025 			*p = tolower(*name);
2026 		else
2027 			*p = *name;
2028 	}
2029 	*p = '\0';
2030 	for (c = codetab; c->c_name; c++)
2031 		if (!strcmp(buf, c->c_name))
2032 			return (c->c_val);
2033 
2034 	return (-1);
2035 }
2036 
2037 static void
2038 markit(void)
2039 {
2040 	struct filed *f;
2041 	dq_t q, next;
2042 
2043 	now = time((time_t *)NULL);
2044 	MarkSeq += TIMERINTVL;
2045 	if (MarkSeq >= MarkInterval) {
2046 		logmsg(LOG_INFO, "-- MARK --",
2047 		    LocalHostName, ADDDATE|MARK);
2048 		MarkSeq = 0;
2049 	}
2050 
2051 	for (f = Files; f; f = f->f_next) {
2052 		if (f->f_prevcount && now >= REPEATTIME(f)) {
2053 			dprintf("flush %s: repeated %d times, %d sec.\n",
2054 			    TypeNames[f->f_type], f->f_prevcount,
2055 			    repeatinterval[f->f_repeatcount]);
2056 			fprintlog(f, 0, (char *)NULL);
2057 			BACKOFF(f);
2058 		}
2059 	}
2060 
2061 	/* Walk the dead queue, and see if we should signal somebody. */
2062 	for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2063 		next = TAILQ_NEXT(q, dq_entries);
2064 
2065 		switch (q->dq_timeout) {
2066 		case 0:
2067 			/* Already signalled once, try harder now. */
2068 			if (kill(q->dq_pid, SIGKILL) != 0)
2069 				(void)deadq_remove(q->dq_pid);
2070 			break;
2071 
2072 		case 1:
2073 			/*
2074 			 * Timed out on dead queue, send terminate
2075 			 * signal.  Note that we leave the removal
2076 			 * from the dead queue to reapchild(), which
2077 			 * will also log the event (unless the process
2078 			 * didn't even really exist, in case we simply
2079 			 * drop it from the dead queue).
2080 			 */
2081 			if (kill(q->dq_pid, SIGTERM) != 0)
2082 				(void)deadq_remove(q->dq_pid);
2083 			/* FALLTHROUGH */
2084 
2085 		default:
2086 			q->dq_timeout--;
2087 		}
2088 	}
2089 	MarkSet = 0;
2090 	(void)alarm(TIMERINTVL);
2091 }
2092 
2093 /*
2094  * fork off and become a daemon, but wait for the child to come online
2095  * before returing to the parent, or we get disk thrashing at boot etc.
2096  * Set a timer so we don't hang forever if it wedges.
2097  */
2098 static int
2099 waitdaemon(int nochdir, int noclose, int maxwait)
2100 {
2101 	int fd;
2102 	int status;
2103 	pid_t pid, childpid;
2104 
2105 	switch (childpid = fork()) {
2106 	case -1:
2107 		return (-1);
2108 	case 0:
2109 		break;
2110 	default:
2111 		signal(SIGALRM, timedout);
2112 		alarm(maxwait);
2113 		while ((pid = wait3(&status, 0, NULL)) != -1) {
2114 			if (WIFEXITED(status))
2115 				errx(1, "child pid %d exited with return code %d",
2116 					pid, WEXITSTATUS(status));
2117 			if (WIFSIGNALED(status))
2118 				errx(1, "child pid %d exited on signal %d%s",
2119 					pid, WTERMSIG(status),
2120 					WCOREDUMP(status) ? " (core dumped)" :
2121 					"");
2122 			if (pid == childpid)	/* it's gone... */
2123 				break;
2124 		}
2125 		exit(0);
2126 	}
2127 
2128 	if (setsid() == -1)
2129 		return (-1);
2130 
2131 	if (!nochdir)
2132 		(void)chdir("/");
2133 
2134 	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2135 		(void)dup2(fd, STDIN_FILENO);
2136 		(void)dup2(fd, STDOUT_FILENO);
2137 		(void)dup2(fd, STDERR_FILENO);
2138 		if (fd > 2)
2139 			(void)close (fd);
2140 	}
2141 	return (getppid());
2142 }
2143 
2144 /*
2145  * We get a SIGALRM from the child when it's running and finished doing it's
2146  * fsync()'s or O_SYNC writes for all the boot messages.
2147  *
2148  * We also get a signal from the kernel if the timer expires, so check to
2149  * see what happened.
2150  */
2151 static void
2152 timedout(int sig __unused)
2153 {
2154 	int left;
2155 	left = alarm(0);
2156 	signal(SIGALRM, SIG_DFL);
2157 	if (left == 0)
2158 		errx(1, "timed out waiting for child");
2159 	else
2160 		_exit(0);
2161 }
2162 
2163 /*
2164  * Add `s' to the list of allowable peer addresses to accept messages
2165  * from.
2166  *
2167  * `s' is a string in the form:
2168  *
2169  *    [*]domainname[:{servicename|portnumber|*}]
2170  *
2171  * or
2172  *
2173  *    netaddr/maskbits[:{servicename|portnumber|*}]
2174  *
2175  * Returns -1 on error, 0 if the argument was valid.
2176  */
2177 static int
2178 allowaddr(char *s)
2179 {
2180 	char *cp1, *cp2;
2181 	struct allowedpeer ap;
2182 	struct servent *se;
2183 	int masklen = -1;
2184 	struct addrinfo hints, *res;
2185 	struct in_addr *addrp, *maskp;
2186 #ifdef INET6
2187 	int i;
2188 	u_int32_t *addr6p, *mask6p;
2189 #endif
2190 	char ip[NI_MAXHOST];
2191 
2192 #ifdef INET6
2193 	if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2194 #endif
2195 		cp1 = s;
2196 	if ((cp1 = strrchr(cp1, ':'))) {
2197 		/* service/port provided */
2198 		*cp1++ = '\0';
2199 		if (strlen(cp1) == 1 && *cp1 == '*')
2200 			/* any port allowed */
2201 			ap.port = 0;
2202 		else if ((se = getservbyname(cp1, "udp"))) {
2203 			ap.port = ntohs(se->s_port);
2204 		} else {
2205 			ap.port = strtol(cp1, &cp2, 0);
2206 			if (*cp2 != '\0')
2207 				return (-1); /* port not numeric */
2208 		}
2209 	} else {
2210 		if ((se = getservbyname("syslog", "udp")))
2211 			ap.port = ntohs(se->s_port);
2212 		else
2213 			/* sanity, should not happen */
2214 			ap.port = 514;
2215 	}
2216 
2217 	if ((cp1 = strchr(s, '/')) != NULL &&
2218 	    strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2219 		*cp1 = '\0';
2220 		if ((masklen = atoi(cp1 + 1)) < 0)
2221 			return (-1);
2222 	}
2223 #ifdef INET6
2224 	if (*s == '[') {
2225 		cp2 = s + strlen(s) - 1;
2226 		if (*cp2 == ']') {
2227 			++s;
2228 			*cp2 = '\0';
2229 		} else {
2230 			cp2 = NULL;
2231 		}
2232 	} else {
2233 		cp2 = NULL;
2234 	}
2235 #endif
2236 	memset(&hints, 0, sizeof(hints));
2237 	hints.ai_family = PF_UNSPEC;
2238 	hints.ai_socktype = SOCK_DGRAM;
2239 	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2240 	if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2241 		ap.isnumeric = 1;
2242 		memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2243 		memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2244 		ap.a_mask.ss_family = res->ai_family;
2245 		if (res->ai_family == AF_INET) {
2246 			ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2247 			maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2248 			addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2249 			if (masklen < 0) {
2250 				/* use default netmask */
2251 				if (IN_CLASSA(ntohl(addrp->s_addr)))
2252 					maskp->s_addr = htonl(IN_CLASSA_NET);
2253 				else if (IN_CLASSB(ntohl(addrp->s_addr)))
2254 					maskp->s_addr = htonl(IN_CLASSB_NET);
2255 				else
2256 					maskp->s_addr = htonl(IN_CLASSC_NET);
2257 			} else if (masklen <= 32) {
2258 				/* convert masklen to netmask */
2259 				if (masklen == 0)
2260 					maskp->s_addr = 0;
2261 				else
2262 					maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2263 			} else {
2264 				freeaddrinfo(res);
2265 				return (-1);
2266 			}
2267 			/* Lose any host bits in the network number. */
2268 			addrp->s_addr &= maskp->s_addr;
2269 		}
2270 #ifdef INET6
2271 		else if (res->ai_family == AF_INET6 && masklen <= 128) {
2272 			ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2273 			if (masklen < 0)
2274 				masklen = 128;
2275 			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2276 			/* convert masklen to netmask */
2277 			while (masklen > 0) {
2278 				if (masklen < 32) {
2279 					*mask6p = htonl(~(0xffffffff >> masklen));
2280 					break;
2281 				}
2282 				*mask6p++ = 0xffffffff;
2283 				masklen -= 32;
2284 			}
2285 			/* Lose any host bits in the network number. */
2286 			mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2287 			addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2288 			for (i = 0; i < 4; i++)
2289 				addr6p[i] &= mask6p[i];
2290 		}
2291 #endif
2292 		else {
2293 			freeaddrinfo(res);
2294 			return (-1);
2295 		}
2296 		freeaddrinfo(res);
2297 	} else {
2298 		/* arg `s' is domain name */
2299 		ap.isnumeric = 0;
2300 		ap.a_name = s;
2301 		if (cp1)
2302 			*cp1 = '/';
2303 #ifdef INET6
2304 		if (cp2) {
2305 			*cp2 = ']';
2306 			--s;
2307 		}
2308 #endif
2309 	}
2310 
2311 	if (Debug) {
2312 		printf("allowaddr: rule %d: ", NumAllowed);
2313 		if (ap.isnumeric) {
2314 			printf("numeric, ");
2315 			getnameinfo((struct sockaddr *)&ap.a_addr,
2316 				    ((struct sockaddr *)&ap.a_addr)->sa_len,
2317 				    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2318 			printf("addr = %s, ", ip);
2319 			getnameinfo((struct sockaddr *)&ap.a_mask,
2320 				    ((struct sockaddr *)&ap.a_mask)->sa_len,
2321 				    ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2322 			printf("mask = %s; ", ip);
2323 		} else {
2324 			printf("domainname = %s; ", ap.a_name);
2325 		}
2326 		printf("port = %d\n", ap.port);
2327 	}
2328 
2329 	if ((AllowedPeers = realloc(AllowedPeers,
2330 				    ++NumAllowed * sizeof(struct allowedpeer)))
2331 	    == NULL) {
2332 		logerror("realloc");
2333 		exit(1);
2334 	}
2335 	memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2336 	return (0);
2337 }
2338 
2339 /*
2340  * Validate that the remote peer has permission to log to us.
2341  */
2342 static int
2343 validate(struct sockaddr *sa, const char *hname)
2344 {
2345 	int i;
2346 	size_t l1, l2;
2347 	char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2348 	struct allowedpeer *ap;
2349 	struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2350 #ifdef INET6
2351 	int j, reject;
2352 	struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2353 #endif
2354 	struct addrinfo hints, *res;
2355 	u_short sport;
2356 
2357 	if (NumAllowed == 0)
2358 		/* traditional behaviour, allow everything */
2359 		return (1);
2360 
2361 	(void)strlcpy(name, hname, sizeof(name));
2362 	memset(&hints, 0, sizeof(hints));
2363 	hints.ai_family = PF_UNSPEC;
2364 	hints.ai_socktype = SOCK_DGRAM;
2365 	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2366 	if (getaddrinfo(name, NULL, &hints, &res) == 0)
2367 		freeaddrinfo(res);
2368 	else if (strchr(name, '.') == NULL) {
2369 		strlcat(name, ".", sizeof name);
2370 		strlcat(name, LocalDomain, sizeof name);
2371 	}
2372 	if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2373 			NI_NUMERICHOST | NI_NUMERICSERV) != 0)
2374 		return (0);	/* for safety, should not occur */
2375 	dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2376 		ip, port, name);
2377 	sport = atoi(port);
2378 
2379 	/* now, walk down the list */
2380 	for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2381 		if (ap->port != 0 && ap->port != sport) {
2382 			dprintf("rejected in rule %d due to port mismatch.\n", i);
2383 			continue;
2384 		}
2385 
2386 		if (ap->isnumeric) {
2387 			if (ap->a_addr.ss_family != sa->sa_family) {
2388 				dprintf("rejected in rule %d due to address family mismatch.\n", i);
2389 				continue;
2390 			}
2391 			if (ap->a_addr.ss_family == AF_INET) {
2392 				sin4 = (struct sockaddr_in *)sa;
2393 				a4p = (struct sockaddr_in *)&ap->a_addr;
2394 				m4p = (struct sockaddr_in *)&ap->a_mask;
2395 				if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2396 				    != a4p->sin_addr.s_addr) {
2397 					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2398 					continue;
2399 				}
2400 			}
2401 #ifdef INET6
2402 			else if (ap->a_addr.ss_family == AF_INET6) {
2403 				sin6 = (struct sockaddr_in6 *)sa;
2404 				a6p = (struct sockaddr_in6 *)&ap->a_addr;
2405 				m6p = (struct sockaddr_in6 *)&ap->a_mask;
2406 				if (a6p->sin6_scope_id != 0 &&
2407 				    sin6->sin6_scope_id != a6p->sin6_scope_id) {
2408 					dprintf("rejected in rule %d due to scope mismatch.\n", i);
2409 					continue;
2410 				}
2411 				reject = 0;
2412 				for (j = 0; j < 16; j += 4) {
2413 					if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2414 					    != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2415 						++reject;
2416 						break;
2417 					}
2418 				}
2419 				if (reject) {
2420 					dprintf("rejected in rule %d due to IP mismatch.\n", i);
2421 					continue;
2422 				}
2423 			}
2424 #endif
2425 			else
2426 				continue;
2427 		} else {
2428 			cp = ap->a_name;
2429 			l1 = strlen(name);
2430 			if (*cp == '*') {
2431 				/* allow wildmatch */
2432 				cp++;
2433 				l2 = strlen(cp);
2434 				if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2435 					dprintf("rejected in rule %d due to name mismatch.\n", i);
2436 					continue;
2437 				}
2438 			} else {
2439 				/* exact match */
2440 				l2 = strlen(cp);
2441 				if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2442 					dprintf("rejected in rule %d due to name mismatch.\n", i);
2443 					continue;
2444 				}
2445 			}
2446 		}
2447 		dprintf("accepted in rule %d.\n", i);
2448 		return (1);	/* hooray! */
2449 	}
2450 	return (0);
2451 }
2452 
2453 /*
2454  * Fairly similar to popen(3), but returns an open descriptor, as
2455  * opposed to a FILE *.
2456  */
2457 static int
2458 p_open(const char *prog, pid_t *rpid)
2459 {
2460 	int pfd[2], nulldesc, i;
2461 	pid_t pid;
2462 	sigset_t omask, mask;
2463 	char *argv[4]; /* sh -c cmd NULL */
2464 	char errmsg[200];
2465 
2466 	if (pipe(pfd) == -1)
2467 		return (-1);
2468 	if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2469 		/* we are royally screwed anyway */
2470 		return (-1);
2471 
2472 	sigemptyset(&mask);
2473 	sigaddset(&mask, SIGALRM);
2474 	sigaddset(&mask, SIGHUP);
2475 	sigprocmask(SIG_BLOCK, &mask, &omask);
2476 	switch ((pid = fork())) {
2477 	case -1:
2478 		sigprocmask(SIG_SETMASK, &omask, 0);
2479 		close(nulldesc);
2480 		return (-1);
2481 
2482 	case 0:
2483 		argv[0] = strdup("sh");
2484 		argv[1] = strdup("-c");
2485 		argv[2] = strdup(prog);
2486 		argv[3] = NULL;
2487 		if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2488 			logerror("strdup");
2489 			exit(1);
2490 		}
2491 
2492 		alarm(0);
2493 		(void)setsid();	/* Avoid catching SIGHUPs. */
2494 
2495 		/*
2496 		 * Throw away pending signals, and reset signal
2497 		 * behaviour to standard values.
2498 		 */
2499 		signal(SIGALRM, SIG_IGN);
2500 		signal(SIGHUP, SIG_IGN);
2501 		sigprocmask(SIG_SETMASK, &omask, 0);
2502 		signal(SIGPIPE, SIG_DFL);
2503 		signal(SIGQUIT, SIG_DFL);
2504 		signal(SIGALRM, SIG_DFL);
2505 		signal(SIGHUP, SIG_DFL);
2506 
2507 		dup2(pfd[0], STDIN_FILENO);
2508 		dup2(nulldesc, STDOUT_FILENO);
2509 		dup2(nulldesc, STDERR_FILENO);
2510 		for (i = getdtablesize(); i > 2; i--)
2511 			(void)close(i);
2512 
2513 		(void)execvp(_PATH_BSHELL, argv);
2514 		_exit(255);
2515 	}
2516 
2517 	sigprocmask(SIG_SETMASK, &omask, 0);
2518 	close(nulldesc);
2519 	close(pfd[0]);
2520 	/*
2521 	 * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
2522 	 * supposed to get an EWOULDBLOCK on writev(2), which is
2523 	 * caught by the logic above anyway, which will in turn close
2524 	 * the pipe, and fork a new logging subprocess if necessary.
2525 	 * The stale subprocess will be killed some time later unless
2526 	 * it terminated itself due to closing its input pipe (so we
2527 	 * get rid of really dead puppies).
2528 	 */
2529 	if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2530 		/* This is bad. */
2531 		(void)snprintf(errmsg, sizeof errmsg,
2532 			       "Warning: cannot change pipe to PID %d to "
2533 			       "non-blocking behaviour.",
2534 			       (int)pid);
2535 		logerror(errmsg);
2536 	}
2537 	*rpid = pid;
2538 	return (pfd[1]);
2539 }
2540 
2541 static void
2542 deadq_enter(pid_t pid, const char *name)
2543 {
2544 	dq_t p;
2545 	int status;
2546 
2547 	/*
2548 	 * Be paranoid, if we can't signal the process, don't enter it
2549 	 * into the dead queue (perhaps it's already dead).  If possible,
2550 	 * we try to fetch and log the child's status.
2551 	 */
2552 	if (kill(pid, 0) != 0) {
2553 		if (waitpid(pid, &status, WNOHANG) > 0)
2554 			log_deadchild(pid, status, name);
2555 		return;
2556 	}
2557 
2558 	p = malloc(sizeof(struct deadq_entry));
2559 	if (p == NULL) {
2560 		logerror("malloc");
2561 		exit(1);
2562 	}
2563 
2564 	p->dq_pid = pid;
2565 	p->dq_timeout = DQ_TIMO_INIT;
2566 	TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2567 }
2568 
2569 static int
2570 deadq_remove(pid_t pid)
2571 {
2572 	dq_t q;
2573 
2574 	TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2575 		if (q->dq_pid == pid) {
2576 			TAILQ_REMOVE(&deadq_head, q, dq_entries);
2577 				free(q);
2578 				return (1);
2579 		}
2580 	}
2581 
2582 	return (0);
2583 }
2584 
2585 static void
2586 log_deadchild(pid_t pid, int status, const char *name)
2587 {
2588 	int code;
2589 	char buf[256];
2590 	const char *reason;
2591 
2592 	errno = 0; /* Keep strerror() stuff out of logerror messages. */
2593 	if (WIFSIGNALED(status)) {
2594 		reason = "due to signal";
2595 		code = WTERMSIG(status);
2596 	} else {
2597 		reason = "with status";
2598 		code = WEXITSTATUS(status);
2599 		if (code == 0)
2600 			return;
2601 	}
2602 	(void)snprintf(buf, sizeof buf,
2603 		       "Logging subprocess %d (%s) exited %s %d.",
2604 		       pid, name, reason, code);
2605 	logerror(buf);
2606 }
2607 
2608 static int *
2609 socksetup(int af, char *bindhostname)
2610 {
2611 	struct addrinfo hints, *res, *r;
2612 	const char *bindservice;
2613 	char *cp;
2614 	int error, maxs, *s, *socks;
2615 
2616 	/*
2617 	 * We have to handle this case for backwards compatibility:
2618 	 * If there are two (or more) colons but no '[' and ']',
2619 	 * assume this is an inet6 address without a service.
2620 	 */
2621 	bindservice = "syslog";
2622 	if (bindhostname != NULL) {
2623 #ifdef INET6
2624 		if (*bindhostname == '[' &&
2625 		    (cp = strchr(bindhostname + 1, ']')) != NULL) {
2626 			++bindhostname;
2627 			*cp = '\0';
2628 			if (cp[1] == ':' && cp[2] != '\0')
2629 				bindservice = cp + 2;
2630 		} else {
2631 #endif
2632 			cp = strchr(bindhostname, ':');
2633 			if (cp != NULL && strchr(cp + 1, ':') == NULL) {
2634 				*cp = '\0';
2635 				if (cp[1] != '\0')
2636 					bindservice = cp + 1;
2637 				if (cp == bindhostname)
2638 					bindhostname = NULL;
2639 			}
2640 #ifdef INET6
2641 		}
2642 #endif
2643 	}
2644 
2645 	memset(&hints, 0, sizeof(hints));
2646 	hints.ai_flags = AI_PASSIVE;
2647 	hints.ai_family = af;
2648 	hints.ai_socktype = SOCK_DGRAM;
2649 	error = getaddrinfo(bindhostname, bindservice, &hints, &res);
2650 	if (error) {
2651 		logerror(gai_strerror(error));
2652 		errno = 0;
2653 		die(0);
2654 	}
2655 
2656 	/* Count max number of sockets we may open */
2657 	for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2658 	socks = malloc((maxs+1) * sizeof(int));
2659 	if (socks == NULL) {
2660 		logerror("couldn't allocate memory for sockets");
2661 		die(0);
2662 	}
2663 
2664 	*socks = 0;   /* num of sockets counter at start of array */
2665 	s = socks + 1;
2666 	for (r = res; r; r = r->ai_next) {
2667 		int on = 1;
2668 		*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2669 		if (*s < 0) {
2670 			logerror("socket");
2671 			continue;
2672 		}
2673 		if (r->ai_family == AF_INET6) {
2674 			if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2675 				       (char *)&on, sizeof (on)) < 0) {
2676 				logerror("setsockopt");
2677 				close(*s);
2678 				continue;
2679 			}
2680 		}
2681 		if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
2682 			       (char *)&on, sizeof (on)) < 0) {
2683 			logerror("setsockopt");
2684 			close(*s);
2685 			continue;
2686 		}
2687 		if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2688 			close(*s);
2689 			logerror("bind");
2690 			continue;
2691 		}
2692 
2693 		double_rbuf(*s);
2694 
2695 		(*socks)++;
2696 		s++;
2697 	}
2698 
2699 	if (*socks == 0) {
2700 		free(socks);
2701 		if (Debug)
2702 			return (NULL);
2703 		else
2704 			die(0);
2705 	}
2706 	if (res)
2707 		freeaddrinfo(res);
2708 
2709 	return (socks);
2710 }
2711 
2712 static void
2713 double_rbuf(int fd)
2714 {
2715 	socklen_t slen, len;
2716 
2717 	if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
2718 		len *= 2;
2719 		setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen);
2720 	}
2721 }
2722