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AHCI - zero-pad ATAPI commands
[dragonfly.git] / usr.sbin / syslogd / syslogd.c
blob4aca424bde1839cccba504c1d2d67ee468089e73
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 * @(#)syslogd.c 8.3 (Berkeley) 4/4/94
30 * $FreeBSD: src/usr.sbin/syslogd/syslogd.c,v 1.163 2008/12/19 18:27:51 delphij Exp $
31 * $DragonFly: src/usr.sbin/syslogd/syslogd.c,v 1.6 2007/08/09 02:17:46 dillon Exp $
32 */
33
34 /*
35 * syslogd -- log system messages
36 *
37 * This program implements a system log. It takes a series of lines.
38 * Each line may have a priority, signified as "<n>" as
39 * the first characters of the line. If this is
40 * not present, a default priority is used.
41 *
42 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will
43 * cause it to reread its configuration file.
44 *
45 * Defined Constants:
46 *
47 * MAXLINE -- the maximum line length that can be handled.
48 * DEFUPRI -- the default priority for user messages
49 * DEFSPRI -- the default priority for kernel messages
50 *
51 * Author: Eric Allman
52 * extensive changes by Ralph Campbell
53 * more extensive changes by Eric Allman (again)
54 * Extension to log by program name as well as facility and priority
55 * by Peter da Silva.
56 * -u and -v by Harlan Stenn.
57 * Priority comparison code by Harlan Stenn.
58 * Ring buffer code by Jeff Wheelhouse.
59 */
60
61 #define MAXLINE 1024 /* maximum line length */
62 #define MAXSVLINE 120 /* maximum saved line length */
63 #define DEFUPRI (LOG_USER|LOG_NOTICE)
64 #define DEFSPRI (LOG_KERN|LOG_CRIT)
65 #define TIMERINTVL 30 /* interval for checking flush, mark */
66 #define TTYMSGTIME 1 /* timeout passed to ttymsg */
67
68 #include <sys/param.h>
69 #include <sys/ioctl.h>
70 #include <sys/stat.h>
71 #include <sys/wait.h>
72 #include <sys/socket.h>
73 #include <sys/queue.h>
74 #include <sys/uio.h>
75 #include <sys/un.h>
76 #include <sys/time.h>
77 #include <sys/resource.h>
78 #include <sys/syslimits.h>
79 #include <sys/mman.h>
80 #include <sys/types.h>
81
82 #include <netinet/in.h>
83 #include <netdb.h>
84 #include <arpa/inet.h>
85
86 #include <ctype.h>
87 #include <err.h>
88 #include <errno.h>
89 #include <fcntl.h>
90 #include <libutil.h>
91 #include <limits.h>
92 #include <paths.h>
93 #include <signal.h>
94 #include <stdio.h>
95 #include <stdlib.h>
96 #include <string.h>
97 #include <sysexits.h>
98 #include <unistd.h>
99 #include <utmp.h>
100
101 #include "pathnames.h"
102 #include "ttymsg.h"
103 #include "../clog/clog.h"
104 #include "../nscd/pidfile.h"
105
106 #define SYSLOG_NAMES
107 #include <sys/syslog.h>
108
109 const char *ConfFile = _PATH_LOGCONF;
110 const char *PidFile = _PATH_LOGPID;
111 const char ctty[] = _PATH_CONSOLE;
112 const char ring_magic[] = "CLOG";
113
114 #define dprintf if (Debug) printf
115
116 #define MAXUNAMES 20 /* maximum number of user names */
117
118 /*
119 * Unix sockets.
120 * We have two default sockets, one with 666 permissions,
121 * and one for privileged programs.
122 */
123 struct funix {
124 int s;
125 const char *name;
126 mode_t mode;
127 STAILQ_ENTRY(funix) next;
128 };
129 struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
130 { NULL } };
131 struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE,
132 { &funix_secure } };
133
134 STAILQ_HEAD(, funix) funixes = { &funix_default,
135 &(funix_secure.next.stqe_next) };
136
137 /*
138 * Flags to logmsg().
139 */
140
141 #define IGN_CONS 0x001 /* don't print on console */
142 #define SYNC_FILE 0x002 /* do fsync on file after printing */
143 #define ADDDATE 0x004 /* add a date to the message */
144 #define MARK 0x008 /* this message is a mark */
145 #define ISKERNEL 0x010 /* kernel generated message */
146
147 /*
148 * This structure represents the files that will have log
149 * copies printed.
150 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
151 * or if f_type if F_PIPE and f_pid > 0.
152 */
153
154 struct filed {
155 struct filed *f_next; /* next in linked list */
156 short f_type; /* entry type, see below */
157 short f_file; /* file descriptor */
158 time_t f_time; /* time this was last written */
159 char *f_host; /* host from which to recd. */
160 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */
161 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */
162 #define PRI_LT 0x1
163 #define PRI_EQ 0x2
164 #define PRI_GT 0x4
165 char *f_program; /* program this applies to */
166 union {
167 char f_uname[MAXUNAMES][UT_NAMESIZE+1];
168 struct {
169 char f_hname[MAXHOSTNAMELEN];
170 struct addrinfo *f_addr;
171
172 } f_forw; /* forwarding address */
173 char f_fname[MAXPATHLEN];
174 struct {
175 char f_pname[MAXPATHLEN];
176 pid_t f_pid;
177 } f_pipe;
178 struct {
179 char f_rname[MAXPATHLEN];
180 struct clog_footer *f_footer;
181 size_t f_size;
182 } f_ring;
183 } f_un;
184 char f_prevline[MAXSVLINE]; /* last message logged */
185 char f_lasttime[16]; /* time of last occurrence */
186 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */
187 int f_prevpri; /* pri of f_prevline */
188 int f_prevlen; /* length of f_prevline */
189 int f_prevcount; /* repetition cnt of prevline */
190 u_int f_repeatcount; /* number of "repeated" msgs */
191 int f_flags; /* file-specific flags */
192 #define FFLAG_SYNC 0x01
193 #define FFLAG_NEEDSYNC 0x02
194 };
195
196 /*
197 * Queue of about-to-be dead processes we should watch out for.
198 */
199
200 TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
201 struct stailhead *deadq_headp;
202
203 struct deadq_entry {
204 pid_t dq_pid;
205 int dq_timeout;
206 TAILQ_ENTRY(deadq_entry) dq_entries;
207 };
208
209 /*
210 * The timeout to apply to processes waiting on the dead queue. Unit
211 * of measure is `mark intervals', i.e. 20 minutes by default.
212 * Processes on the dead queue will be terminated after that time.
213 */
214
215 #define DQ_TIMO_INIT 2
216
217 typedef struct deadq_entry *dq_t;
218
219
220 /*
221 * Struct to hold records of network addresses that are allowed to log
222 * to us.
223 */
224 struct allowedpeer {
225 int isnumeric;
226 u_short port;
227 union {
228 struct {
229 struct sockaddr_storage addr;
230 struct sockaddr_storage mask;
231 } numeric;
232 char *name;
233 } u;
234 #define a_addr u.numeric.addr
235 #define a_mask u.numeric.mask
236 #define a_name u.name
237 };
238
239
240 /*
241 * Intervals at which we flush out "message repeated" messages,
242 * in seconds after previous message is logged. After each flush,
243 * we move to the next interval until we reach the largest.
244 */
245 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */
246 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
247 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount])
248 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \
249 (f)->f_repeatcount = MAXREPEAT; \
250 }
251
252 /* values for f_type */
253 #define F_UNUSED 0 /* unused entry */
254 #define F_FILE 1 /* regular file */
255 #define F_TTY 2 /* terminal */
256 #define F_CONSOLE 3 /* console terminal */
257 #define F_FORW 4 /* remote machine */
258 #define F_USERS 5 /* list of users */
259 #define F_WALL 6 /* everyone logged on */
260 #define F_PIPE 7 /* pipe to program */
261 #define F_RING 8 /* ring buffer (circular log) */
262
263 const char *TypeNames[] = {
264 "UNUSED", "FILE", "TTY", "CONSOLE",
265 "FORW", "USERS", "WALL", "PIPE",
266 "RING"
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, const 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 ssize_t rbwrite(struct filed *, char *, size_t);
331 ssize_t rbwritev(struct filed *, struct iovec *, int);
332 static void readklog(void);
333 static void reapchild(int);
334 static void usage(void);
335 static int validate(struct sockaddr *, const char *);
336 static void unmapped(struct sockaddr *);
337 static void wallmsg(struct filed *, struct iovec *, const int iovlen);
338 static int waitdaemon(int, int, int);
339 static void timedout(int);
340 static void double_rbuf(int);
341
342 int
343 main(int argc, char *argv[])
344 {
345 int ch, i, fdsrmax = 0, l;
346 struct sockaddr_un sunx, fromunix;
347 struct sockaddr_storage frominet;
348 fd_set *fdsr = NULL;
349 char line[MAXLINE + 1];
350 const char *bindhostname, *hname;
351 struct timeval tv, *tvp;
352 struct sigaction sact;
353 struct funix *fx, *fx1;
354 sigset_t mask;
355 pid_t ppid = 1, spid;
356 socklen_t len;
357
358 bindhostname = NULL;
359 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nop:P:sS:Tuv"))
360 != -1)
361 switch (ch) {
362 case '4':
363 family = PF_INET;
364 break;
365 #ifdef INET6
366 case '6':
367 family = PF_INET6;
368 break;
369 #endif
370 case '8':
371 mask_C1 = 0;
372 break;
373 case 'A':
374 send_to_all++;
375 break;
376 case 'a': /* allow specific network addresses only */
377 if (allowaddr(optarg) == -1)
378 usage();
379 break;
380 case 'b':
381 bindhostname = optarg;
382 break;
383 case 'c':
384 no_compress++;
385 break;
386 case 'C':
387 logflags |= O_CREAT;
388 break;
389 case 'd': /* debug */
390 Debug++;
391 break;
392 case 'f': /* configuration file */
393 ConfFile = optarg;
394 break;
395 case 'k': /* keep remote kern fac */
396 KeepKernFac = 1;
397 break;
398 case 'l':
399 {
400 long perml;
401 mode_t mode;
402 char *name, *ep;
403
404 if (optarg[0] == '/') {
405 mode = DEFFILEMODE;
406 name = optarg;
407 } else if ((name = strchr(optarg, ':')) != NULL) {
408 *name++ = '\0';
409 if (name[0] != '/')
410 errx(1, "socket name must be absolute "
411 "path");
412 if (isdigit(*optarg)) {
413 perml = strtol(optarg, &ep, 8);
414 if (*ep || perml < 0 ||
415 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
416 errx(1, "invalid mode %s, exiting",
417 optarg);
418 mode = (mode_t )perml;
419 } else
420 errx(1, "invalid mode %s, exiting",
421 optarg);
422 } else /* doesn't begin with '/', and no ':' */
423 errx(1, "can't parse path %s", optarg);
424
425 if (strlen(name) >= sizeof(sunx.sun_path))
426 errx(1, "%s path too long, exiting", name);
427 if ((fx = malloc(sizeof(struct funix))) == NULL)
428 errx(1, "malloc failed");
429 fx->s = -1;
430 fx->name = name;
431 fx->mode = mode;
432 STAILQ_INSERT_TAIL(&funixes, fx, next);
433 break;
434 }
435 case 'm': /* mark interval */
436 MarkInterval = atoi(optarg) * 60;
437 break;
438 case 'n':
439 resolve = 0;
440 break;
441 case 'o':
442 use_bootfile = 1;
443 break;
444 case 'p': /* path */
445 if (strlen(optarg) >= sizeof(sunx.sun_path))
446 errx(1, "%s path too long, exiting", optarg);
447 funix_default.name = optarg;
448 break;
449 case 'P': /* path for alt. PID */
450 PidFile = optarg;
451 break;
452 case 's': /* no network mode */
453 SecureMode++;
454 break;
455 case 'S': /* path for privileged originator */
456 if (strlen(optarg) >= sizeof(sunx.sun_path))
457 errx(1, "%s path too long, exiting", optarg);
458 funix_secure.name = optarg;
459 break;
460 case 'T':
461 RemoteAddDate = 1;
462 break;
463 case 'u': /* only log specified priority */
464 UniquePriority++;
465 break;
466 case 'v': /* log facility and priority */
467 LogFacPri++;
468 break;
469 default:
470 usage();
471 }
472 if ((argc -= optind) != 0)
473 usage();
474
475 pfh = pidfile_open(PidFile, 0600, &spid);
476 if (pfh == NULL) {
477 if (errno == EEXIST)
478 errx(1, "syslogd already running, pid: %d", spid);
479 warn("cannot open pid file");
480 }
481
482 if (!Debug) {
483 ppid = waitdaemon(0, 0, 30);
484 if (ppid < 0) {
485 warn("could not become daemon");
486 pidfile_remove(pfh);
487 exit(1);
488 }
489 } else {
490 setlinebuf(stdout);
491 }
492
493 if (NumAllowed)
494 endservent();
495
496 consfile.f_type = F_CONSOLE;
497 strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
498 sizeof(consfile.f_un.f_fname));
499 strlcpy(bootfile, getbootfile(), sizeof(bootfile));
500 signal(SIGTERM, dodie);
501 signal(SIGINT, Debug ? dodie : SIG_IGN);
502 signal(SIGQUIT, Debug ? dodie : SIG_IGN);
503 /*
504 * We don't want the SIGCHLD and SIGHUP handlers to interfere
505 * with each other; they are likely candidates for being called
506 * simultaneously (SIGHUP closes pipe descriptor, process dies,
507 * SIGCHLD happens).
508 */
509 sigemptyset(&mask);
510 sigaddset(&mask, SIGHUP);
511 sact.sa_handler = reapchild;
512 sact.sa_mask = mask;
513 sact.sa_flags = SA_RESTART;
514 sigaction(SIGCHLD, &sact, NULL);
515 signal(SIGALRM, domark);
516 signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */
517 alarm(TIMERINTVL);
518
519 TAILQ_INIT(&deadq_head);
520
521 #ifndef SUN_LEN
522 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
523 #endif
524 STAILQ_FOREACH_MUTABLE(fx, &funixes, next, fx1) {
525 unlink(fx->name);
526 memset(&sunx, 0, sizeof(sunx));
527 sunx.sun_family = AF_LOCAL;
528 strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path));
529 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0);
530 if (fx->s < 0 ||
531 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
532 chmod(fx->name, fx->mode) < 0) {
533 snprintf(line, sizeof line,
534 "cannot create %s", fx->name);
535 logerror(line);
536 dprintf("cannot create %s (%d)\n", fx->name, errno);
537 if (fx == &funix_default || fx == &funix_secure)
538 die(0);
539 else {
540 STAILQ_REMOVE(&funixes, fx, funix, next);
541 continue;
542 }
543 double_rbuf(fx->s);
544 }
545 }
546 if (SecureMode <= 1)
547 finet = socksetup(family, bindhostname);
548
549 if (finet) {
550 if (SecureMode) {
551 for (i = 0; i < *finet; i++) {
552 if (shutdown(finet[i+1], SHUT_RD) < 0) {
553 logerror("shutdown");
554 if (!Debug)
555 die(0);
556 }
557 }
558 } else {
559 dprintf("listening on inet and/or inet6 socket\n");
560 }
561 dprintf("sending on inet and/or inet6 socket\n");
562 }
563
564 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
565 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
566 fklog = -1;
567 if (fklog < 0)
568 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
569
570 /* tuck my process id away */
571 pidfile_write(pfh);
572
573 dprintf("off & running....\n");
574
575 init(0);
576 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */
577 sigemptyset(&mask);
578 sigaddset(&mask, SIGCHLD);
579 sact.sa_handler = init;
580 sact.sa_mask = mask;
581 sact.sa_flags = SA_RESTART;
582 sigaction(SIGHUP, &sact, NULL);
583
584 tvp = &tv;
585 tv.tv_sec = tv.tv_usec = 0;
586
587 if (fklog != -1 && fklog > fdsrmax)
588 fdsrmax = fklog;
589 if (finet && !SecureMode) {
590 for (i = 0; i < *finet; i++) {
591 if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
592 fdsrmax = finet[i+1];
593 }
594 }
595 STAILQ_FOREACH(fx, &funixes, next)
596 if (fx->s > fdsrmax)
597 fdsrmax = fx->s;
598
599 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
600 sizeof(fd_mask));
601 if (fdsr == NULL)
602 errx(1, "calloc fd_set");
603
604 for (;;) {
605 if (MarkSet)
606 markit();
607 if (WantDie)
608 die(WantDie);
609
610 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
611 sizeof(fd_mask));
612
613 if (fklog != -1)
614 FD_SET(fklog, fdsr);
615 if (finet && !SecureMode) {
616 for (i = 0; i < *finet; i++) {
617 if (finet[i+1] != -1)
618 FD_SET(finet[i+1], fdsr);
619 }
620 }
621 STAILQ_FOREACH(fx, &funixes, next)
622 FD_SET(fx->s, fdsr);
623
624 i = select(fdsrmax+1, fdsr, NULL, NULL,
625 needdofsync ? &tv : tvp);
626 switch (i) {
627 case 0:
628 dofsync();
629 needdofsync = 0;
630 if (tvp) {
631 tvp = NULL;
632 if (ppid != 1)
633 kill(ppid, SIGALRM);
634 }
635 continue;
636 case -1:
637 if (errno != EINTR)
638 logerror("select");
639 continue;
640 }
641 if (fklog != -1 && FD_ISSET(fklog, fdsr))
642 readklog();
643 if (finet && !SecureMode) {
644 for (i = 0; i < *finet; i++) {
645 if (FD_ISSET(finet[i+1], fdsr)) {
646 len = sizeof(frominet);
647 l = recvfrom(finet[i+1], line, MAXLINE,
648 0, (struct sockaddr *)&frominet,
649 &len);
650 if (l > 0) {
651 line[l] = '\0';
652 hname = cvthname((struct sockaddr *)&frominet);
653 unmapped((struct sockaddr *)&frominet);
654 if (validate((struct sockaddr *)&frominet, hname))
655 printline(hname, line, RemoteAddDate ? ADDDATE : 0);
656 } else if (l < 0 && errno != EINTR)
657 logerror("recvfrom inet");
658 }
659 }
660 }
661 STAILQ_FOREACH(fx, &funixes, next) {
662 if (FD_ISSET(fx->s, fdsr)) {
663 len = sizeof(fromunix);
664 l = recvfrom(fx->s, line, MAXLINE, 0,
665 (struct sockaddr *)&fromunix, &len);
666 if (l > 0) {
667 line[l] = '\0';
668 printline(LocalHostName, line, 0);
669 } else if (l < 0 && errno != EINTR)
670 logerror("recvfrom unix");
671 }
672 }
673 }
674 if (fdsr)
675 free(fdsr);
676 }
677
678 static void
679 unmapped(struct sockaddr *sa)
680 {
681 struct sockaddr_in6 *sin6;
682 struct sockaddr_in sin4;
683
684 if (sa->sa_family != AF_INET6)
685 return;
686 if (sa->sa_len != sizeof(struct sockaddr_in6) ||
687 sizeof(sin4) > sa->sa_len)
688 return;
689 sin6 = (struct sockaddr_in6 *)sa;
690 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
691 return;
692
693 memset(&sin4, 0, sizeof(sin4));
694 sin4.sin_family = AF_INET;
695 sin4.sin_len = sizeof(struct sockaddr_in);
696 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
697 sizeof(sin4.sin_addr));
698 sin4.sin_port = sin6->sin6_port;
699
700 memcpy(sa, &sin4, sin4.sin_len);
701 }
702
703 static void
704 usage(void)
705 {
706
707 fprintf(stderr, "%s\n%s\n%s\n%s\n",
708 "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]",
709 " [-b bind_address] [-f config_file]",
710 " [-l [mode:]path] [-m mark_interval]",
711 " [-P pid_file] [-p log_socket]");
712 exit(1);
713 }
714
715 /*
716 * Take a raw input line, decode the message, and print the message
717 * on the appropriate log files.
718 */
719 static void
720 printline(const char *hname, char *msg, int flags)
721 {
722 char *p, *q;
723 long n;
724 int c, pri;
725 char line[MAXLINE + 1];
726
727 /* test for special codes */
728 p = msg;
729 pri = DEFUPRI;
730 if (*p == '<') {
731 errno = 0;
732 n = strtol(p + 1, &q, 10);
733 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
734 p = q + 1;
735 pri = n;
736 }
737 }
738 if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
739 pri = DEFUPRI;
740
741 /*
742 * Don't allow users to log kernel messages.
743 * NOTE: since LOG_KERN == 0 this will also match
744 * messages with no facility specified.
745 */
746 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
747 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
748
749 q = line;
750
751 while ((c = (unsigned char)*p++) != '\0' &&
752 q < &line[sizeof(line) - 4]) {
753 if (mask_C1 && (c & 0x80) && c < 0xA0) {
754 c &= 0x7F;
755 *q++ = 'M';
756 *q++ = '-';
757 }
758 if (isascii(c) && iscntrl(c)) {
759 if (c == '\n') {
760 *q++ = ' ';
761 } else if (c == '\t') {
762 *q++ = '\t';
763 } else {
764 *q++ = '^';
765 *q++ = c ^ 0100;
766 }
767 } else {
768 *q++ = c;
769 }
770 }
771 *q = '\0';
772
773 logmsg(pri, line, hname, flags);
774 }
775
776 /*
777 * Read /dev/klog while data are available, split into lines.
778 */
779 static void
780 readklog(void)
781 {
782 char *p, *q, line[MAXLINE + 1];
783 int len, i;
784
785 len = 0;
786 for (;;) {
787 i = read(fklog, line + len, MAXLINE - 1 - len);
788 if (i > 0) {
789 line[i + len] = '\0';
790 } else {
791 if (i < 0 && errno != EINTR && errno != EAGAIN) {
792 logerror("klog");
793 fklog = -1;
794 }
795 break;
796 }
797
798 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
799 *q = '\0';
800 printsys(p);
801 }
802 len = strlen(p);
803 if (len >= MAXLINE - 1) {
804 printsys(p);
805 len = 0;
806 }
807 if (len > 0)
808 memmove(line, p, len + 1);
809 }
810 if (len > 0)
811 printsys(line);
812 }
813
814 /*
815 * Take a raw input line from /dev/klog, format similar to syslog().
816 */
817 static void
818 printsys(char *msg)
819 {
820 char *p, *q;
821 long n;
822 int flags, isprintf, pri;
823
824 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */
825 p = msg;
826 pri = DEFSPRI;
827 isprintf = 1;
828 if (*p == '<') {
829 errno = 0;
830 n = strtol(p + 1, &q, 10);
831 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
832 p = q + 1;
833 pri = n;
834 isprintf = 0;
835 }
836 }
837 /*
838 * Kernel printf's and LOG_CONSOLE messages have been displayed
839 * on the console already.
840 */
841 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
842 flags |= IGN_CONS;
843 if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
844 pri = DEFSPRI;
845 logmsg(pri, p, LocalHostName, flags);
846 }
847
848 static time_t now;
849
850 /*
851 * Match a program or host name against a specification.
852 * Return a non-0 value if the message must be ignored
853 * based on the specification.
854 */
855 static int
856 skip_message(const char *name, const char *spec, int checkcase)
857 {
858 const char *s;
859 char prev, next;
860 int exclude = 0;
861 /* Behaviour on explicit match */
862
863 if (spec == NULL)
864 return 0;
865 switch (*spec) {
866 case '-':
867 exclude = 1;
868 /*FALLTHROUGH*/
869 case '+':
870 spec++;
871 break;
872 default:
873 break;
874 }
875 if (checkcase)
876 s = strstr (spec, name);
877 else
878 s = strcasestr (spec, name);
879
880 if (s != NULL) {
881 prev = (s == spec ? ',' : *(s - 1));
882 next = *(s + strlen (name));
883
884 if (prev == ',' && (next == '\0' || next == ','))
885 /* Explicit match: skip iff the spec is an
886 exclusive one. */
887 return exclude;
888 }
889
890 /* No explicit match for this name: skip the message iff
891 the spec is an inclusive one. */
892 return !exclude;
893 }
894
895 /*
896 * Log a message to the appropriate log files, users, etc. based on
897 * the priority.
898 */
899 static void
900 logmsg(int pri, const char *msg, const char *from, int flags)
901 {
902 struct filed *f;
903 int i, fac, msglen, omask, prilev;
904 const char *timestamp;
905 char prog[NAME_MAX+1];
906 char buf[MAXLINE+1];
907
908 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
909 pri, flags, from, msg);
910
911 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
912
913 /*
914 * Check to see if msg looks non-standard.
915 */
916 msglen = strlen(msg);
917 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
918 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
919 flags |= ADDDATE;
920
921 time(&now);
922 if (flags & ADDDATE) {
923 timestamp = ctime(&now) + 4;
924 } else {
925 timestamp = msg;
926 msg += 16;
927 msglen -= 16;
928 }
929
930 /* skip leading blanks */
931 while (isspace(*msg)) {
932 msg++;
933 msglen--;
934 }
935
936 /* extract facility and priority level */
937 if (flags & MARK)
938 fac = LOG_NFACILITIES;
939 else
940 fac = LOG_FAC(pri);
941
942 /* Check maximum facility number. */
943 if (fac > LOG_NFACILITIES) {
944 sigsetmask(omask);
945 return;
946 }
947
948 prilev = LOG_PRI(pri);
949
950 /* extract program name */
951 for (i = 0; i < NAME_MAX; i++) {
952 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
953 msg[i] == '/' || isspace(msg[i]))
954 break;
955 prog[i] = msg[i];
956 }
957 prog[i] = 0;
958
959 /* add kernel prefix for kernel messages */
960 if (flags & ISKERNEL) {
961 snprintf(buf, sizeof(buf), "%s: %s",
962 use_bootfile ? bootfile : "kernel", msg);
963 msg = buf;
964 msglen = strlen(buf);
965 }
966
967 /* log the message to the particular outputs */
968 if (!Initialized) {
969 f = &consfile;
970 /*
971 * Open in non-blocking mode to avoid hangs during open
972 * and close(waiting for the port to drain).
973 */
974 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
975
976 if (f->f_file >= 0) {
977 strlcpy(f->f_lasttime, timestamp,
978 sizeof(f->f_lasttime));
979 fprintlog(f, flags, msg);
980 close(f->f_file);
981 }
982 sigsetmask(omask);
983 return;
984 }
985 for (f = Files; f; f = f->f_next) {
986 /* skip messages that are incorrect priority */
987 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
988 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
989 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
990 )
991 || f->f_pmask[fac] == INTERNAL_NOPRI)
992 continue;
993
994 /* skip messages with the incorrect hostname */
995 if (skip_message(from, f->f_host, 0))
996 continue;
997
998 /* skip messages with the incorrect program name */
999 if (skip_message(prog, f->f_program, 1))
1000 continue;
1001
1002 /* skip message to console if it has already been printed */
1003 if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1004 continue;
1005
1006 /* don't output marks to recently written files */
1007 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1008 continue;
1009
1010 /*
1011 * suppress duplicate lines to this file
1012 */
1013 if (no_compress - (f->f_type != F_PIPE) < 1 &&
1014 (flags & MARK) == 0 && msglen == f->f_prevlen &&
1015 f->f_prevline && !strcmp(msg, f->f_prevline) &&
1016 !strcasecmp(from, f->f_prevhost)) {
1017 strlcpy(f->f_lasttime, timestamp,
1018 sizeof(f->f_lasttime));
1019 f->f_prevcount++;
1020 dprintf("msg repeated %d times, %ld sec of %d\n",
1021 f->f_prevcount, (long)(now - f->f_time),
1022 repeatinterval[f->f_repeatcount]);
1023 /*
1024 * If domark would have logged this by now,
1025 * flush it now (so we don't hold isolated messages),
1026 * but back off so we'll flush less often
1027 * in the future.
1028 */
1029 if (now > REPEATTIME(f)) {
1030 fprintlog(f, flags, NULL);
1031 BACKOFF(f);
1032 }
1033 } else {
1034 /* new line, save it */
1035 if (f->f_prevcount)
1036 fprintlog(f, 0, NULL);
1037 f->f_repeatcount = 0;
1038 f->f_prevpri = pri;
1039 strlcpy(f->f_lasttime, timestamp,
1040 sizeof(f->f_lasttime));
1041 strlcpy(f->f_prevhost, from, sizeof(f->f_prevhost));
1042 if (msglen < MAXSVLINE) {
1043 f->f_prevlen = msglen;
1044 strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
1045 fprintlog(f, flags, NULL);
1046 } else {
1047 f->f_prevline[0] = 0;
1048 f->f_prevlen = 0;
1049 fprintlog(f, flags, msg);
1050 }
1051 }
1052 }
1053 sigsetmask(omask);
1054 }
1055
1056 static void
1057 dofsync(void)
1058 {
1059 struct filed *f;
1060
1061 for (f = Files; f; f = f->f_next) {
1062 if ((f->f_type == F_FILE) &&
1063 (f->f_flags & FFLAG_NEEDSYNC)) {
1064 f->f_flags &= ~FFLAG_NEEDSYNC;
1065 fsync(f->f_file);
1066 }
1067 }
1068 }
1069
1070 #define IOV_SIZE 7
1071 static void
1072 fprintlog(struct filed *f, int flags, const char *msg)
1073 {
1074 struct iovec iov[IOV_SIZE];
1075 struct iovec *v;
1076 struct addrinfo *r;
1077 int i, l, lsent = 0;
1078 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
1079 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
1080 const char *msgret;
1081
1082 v = iov;
1083 if (f->f_type == F_WALL) {
1084 v->iov_base = greetings;
1085 /* The time displayed is not synchornized with the other log
1086 * destinations (like messages). Following fragment was using
1087 * ctime(&now), which was updating the time every 30 sec.
1088 * With f_lasttime, time is synchronized correctly.
1089 */
1090 v->iov_len = snprintf(greetings, sizeof greetings,
1091 "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
1092 f->f_prevhost, f->f_lasttime);
1093 if (v->iov_len > 0)
1094 v++;
1095 v->iov_base = nul;
1096 v->iov_len = 0;
1097 v++;
1098 } else {
1099 v->iov_base = f->f_lasttime;
1100 v->iov_len = strlen(f->f_lasttime);
1101 v++;
1102 v->iov_base = space;
1103 v->iov_len = 1;
1104 v++;
1105 }
1106
1107 if (LogFacPri) {
1108 static char fp_buf[30]; /* Hollow laugh */
1109 int fac = f->f_prevpri & LOG_FACMASK;
1110 int pri = LOG_PRI(f->f_prevpri);
1111 const char *f_s = NULL;
1112 char f_n[5]; /* Hollow laugh */
1113 const char *p_s = NULL;
1114 char p_n[5]; /* Hollow laugh */
1115
1116 if (LogFacPri > 1) {
1117 CODE *c;
1118
1119 for (c = facilitynames; c->c_name; c++) {
1120 if (c->c_val == fac) {
1121 f_s = c->c_name;
1122 break;
1123 }
1124 }
1125 for (c = prioritynames; c->c_name; c++) {
1126 if (c->c_val == pri) {
1127 p_s = c->c_name;
1128 break;
1129 }
1130 }
1131 }
1132 if (!f_s) {
1133 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1134 f_s = f_n;
1135 }
1136 if (!p_s) {
1137 snprintf(p_n, sizeof p_n, "%d", pri);
1138 p_s = p_n;
1139 }
1140 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
1141 v->iov_base = fp_buf;
1142 v->iov_len = strlen(fp_buf);
1143 } else {
1144 v->iov_base = nul;
1145 v->iov_len = 0;
1146 }
1147 v++;
1148
1149 v->iov_base = f->f_prevhost;
1150 v->iov_len = strlen(v->iov_base);
1151 v++;
1152 v->iov_base = space;
1153 v->iov_len = 1;
1154 v++;
1155
1156 if (msg) {
1157 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1158 if (wmsg == NULL) {
1159 logerror("strdup");
1160 exit(1);
1161 }
1162 v->iov_base = wmsg;
1163 v->iov_len = strlen(msg);
1164 } else if (f->f_prevcount > 1) {
1165 v->iov_base = repbuf;
1166 v->iov_len = snprintf(repbuf, sizeof repbuf,
1167 "last message repeated %d times", f->f_prevcount);
1168 } else if (f->f_prevline) {
1169 v->iov_base = f->f_prevline;
1170 v->iov_len = f->f_prevlen;
1171 } else {
1172 return;
1173 }
1174 v++;
1175
1176 dprintf("Logging to %s", TypeNames[f->f_type]);
1177 f->f_time = now;
1178
1179 switch (f->f_type) {
1180 int port;
1181 case F_UNUSED:
1182 dprintf("\n");
1183 break;
1184
1185 case F_FORW:
1186 port = (int)ntohs(((struct sockaddr_in *)
1187 (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1188 if (port != 514) {
1189 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port);
1190 } else {
1191 dprintf(" %s\n", f->f_un.f_forw.f_hname);
1192 }
1193 /* check for local vs remote messages */
1194 if (strcasecmp(f->f_prevhost, LocalHostName))
1195 l = snprintf(line, sizeof line - 1,
1196 "<%d>%.15s Forwarded from %s: %s",
1197 f->f_prevpri, (char *)iov[0].iov_base,
1198 f->f_prevhost, (char *)iov[5].iov_base);
1199 else
1200 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1201 f->f_prevpri, (char *)iov[0].iov_base,
1202 (char *)iov[5].iov_base);
1203 if (l < 0)
1204 l = 0;
1205 else if (l > MAXLINE)
1206 l = MAXLINE;
1207
1208 if (finet) {
1209 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1210 for (i = 0; i < *finet; i++) {
1211 #if 0
1212 /*
1213 * should we check AF first, or just
1214 * trial and error? FWD
1215 */
1216 if (r->ai_family ==
1217 address_family_of(finet[i+1]))
1218 #endif
1219 lsent = sendto(finet[i+1], line, l, 0,
1220 r->ai_addr, r->ai_addrlen);
1221 if (lsent == l)
1222 break;
1223 }
1224 if (lsent == l && !send_to_all)
1225 break;
1226 }
1227 dprintf("lsent/l: %d/%d\n", lsent, l);
1228 if (lsent != l) {
1229 int e = errno;
1230 logerror("sendto");
1231 errno = e;
1232 switch (errno) {
1233 case ENOBUFS:
1234 case ENETDOWN:
1235 case EHOSTUNREACH:
1236 case EHOSTDOWN:
1237 break;
1238 /* case EBADF: */
1239 /* case EACCES: */
1240 /* case ENOTSOCK: */
1241 /* case EFAULT: */
1242 /* case EMSGSIZE: */
1243 /* case EAGAIN: */
1244 /* case ENOBUFS: */
1245 /* case ECONNREFUSED: */
1246 default:
1247 dprintf("removing entry\n");
1248 f->f_type = F_UNUSED;
1249 break;
1250 }
1251 }
1252 }
1253 break;
1254
1255 case F_FILE:
1256 dprintf(" %s\n", f->f_un.f_fname);
1257 v->iov_base = lf;
1258 v->iov_len = 1;
1259 if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1260 /*
1261 * If writev(2) fails for potentially transient errors
1262 * like the filesystem being full, ignore it.
1263 * Otherwise remove this logfile from the list.
1264 */
1265 if (errno != ENOSPC) {
1266 int e = errno;
1267 close(f->f_file);
1268 f->f_type = F_UNUSED;
1269 errno = e;
1270 logerror(f->f_un.f_fname);
1271 }
1272 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1273 f->f_flags |= FFLAG_NEEDSYNC;
1274 needdofsync = 1;
1275 }
1276 break;
1277
1278 case F_RING:
1279 dprintf(" %s\n", f->f_un.f_ring.f_rname);
1280 v->iov_base = lf;
1281 v->iov_len = 1;
1282 if (rbwritev(f, iov, 7) == -1) {
1283 int e = errno;
1284 munmap(f->f_un.f_ring.f_footer,
1285 sizeof(struct clog_footer));
1286 close(f->f_file);
1287 f->f_type = F_UNUSED;
1288 errno = e;
1289 logerror(f->f_un.f_fname);
1290 }
1291 break;
1292
1293 case F_PIPE:
1294 dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1295 v->iov_base = lf;
1296 v->iov_len = 1;
1297 if (f->f_un.f_pipe.f_pid == 0) {
1298 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1299 &f->f_un.f_pipe.f_pid)) < 0) {
1300 f->f_type = F_UNUSED;
1301 logerror(f->f_un.f_pipe.f_pname);
1302 break;
1303 }
1304 }
1305 if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1306 int e = errno;
1307 close(f->f_file);
1308 if (f->f_un.f_pipe.f_pid > 0)
1309 deadq_enter(f->f_un.f_pipe.f_pid,
1310 f->f_un.f_pipe.f_pname);
1311 f->f_un.f_pipe.f_pid = 0;
1312 errno = e;
1313 logerror(f->f_un.f_pipe.f_pname);
1314 }
1315 break;
1316
1317 case F_CONSOLE:
1318 if (flags & IGN_CONS) {
1319 dprintf(" (ignored)\n");
1320 break;
1321 }
1322 /* FALLTHROUGH */
1323
1324 case F_TTY:
1325 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1326 v->iov_base = crlf;
1327 v->iov_len = 2;
1328
1329 errno = 0; /* ttymsg() only sometimes returns an errno */
1330 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) {
1331 f->f_type = F_UNUSED;
1332 logerror(msgret);
1333 }
1334 break;
1335
1336 case F_USERS:
1337 case F_WALL:
1338 dprintf("\n");
1339 v->iov_base = crlf;
1340 v->iov_len = 2;
1341 wallmsg(f, iov, IOV_SIZE);
1342 break;
1343 }
1344 f->f_prevcount = 0;
1345 free(wmsg);
1346 }
1347
1348 /*
1349 * WALLMSG -- Write a message to the world at large
1350 *
1351 * Write the specified message to either the entire
1352 * world, or a list of approved users.
1353 */
1354 static void
1355 wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1356 {
1357 static int reenter; /* avoid calling ourselves */
1358 FILE *uf;
1359 struct utmp ut;
1360 int i;
1361 const char *p;
1362 char line[sizeof(ut.ut_line) + 1];
1363
1364 if (reenter++)
1365 return;
1366 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1367 logerror(_PATH_UTMP);
1368 reenter = 0;
1369 return;
1370 }
1371 /* NOSTRICT */
1372 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1373 if (ut.ut_name[0] == '\0')
1374 continue;
1375 /* We must use strncpy since ut_* may not be NUL terminated. */
1376 strncpy(line, ut.ut_line, sizeof(line) - 1);
1377 line[sizeof(line) - 1] = '\0';
1378 if (f->f_type == F_WALL) {
1379 if ((p = ttymsg(iov, iovlen, line, TTYMSGTIME)) !=
1380 NULL) {
1381 errno = 0; /* already in msg */
1382 logerror(p);
1383 }
1384 continue;
1385 }
1386 /* should we send the message to this user? */
1387 for (i = 0; i < MAXUNAMES; i++) {
1388 if (!f->f_un.f_uname[i][0])
1389 break;
1390 if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1391 UT_NAMESIZE)) {
1392 if ((p = ttymsg(iov, iovlen, line, TTYMSGTIME))
1393 != NULL) {
1394 errno = 0; /* already in msg */
1395 logerror(p);
1396 }
1397 break;
1398 }
1399 }
1400 }
1401 fclose(uf);
1402 reenter = 0;
1403 }
1404
1405 static void
1406 reapchild(int signo __unused)
1407 {
1408 int status;
1409 pid_t pid;
1410 struct filed *f;
1411
1412 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) {
1413 if (!Initialized)
1414 /* Don't tell while we are initting. */
1415 continue;
1416
1417 /* First, look if it's a process from the dead queue. */
1418 if (deadq_remove(pid))
1419 goto oncemore;
1420
1421 /* Now, look in list of active processes. */
1422 for (f = Files; f; f = f->f_next)
1423 if (f->f_type == F_PIPE &&
1424 f->f_un.f_pipe.f_pid == pid) {
1425 close(f->f_file);
1426 f->f_un.f_pipe.f_pid = 0;
1427 log_deadchild(pid, status,
1428 f->f_un.f_pipe.f_pname);
1429 break;
1430 }
1431 oncemore:
1432 continue;
1433 }
1434 }
1435
1436 /*
1437 * Return a printable representation of a host address.
1438 */
1439 static const char *
1440 cvthname(struct sockaddr *f)
1441 {
1442 int error, hl;
1443 sigset_t omask, nmask;
1444 static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1445
1446 error = getnameinfo((struct sockaddr *)f,
1447 ((struct sockaddr *)f)->sa_len,
1448 ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
1449 dprintf("cvthname(%s)\n", ip);
1450
1451 if (error) {
1452 dprintf("Malformed from address %s\n", gai_strerror(error));
1453 return ("???");
1454 }
1455 if (!resolve)
1456 return (ip);
1457
1458 sigemptyset(&nmask);
1459 sigaddset(&nmask, SIGHUP);
1460 sigprocmask(SIG_BLOCK, &nmask, &omask);
1461 error = getnameinfo((struct sockaddr *)f,
1462 ((struct sockaddr *)f)->sa_len,
1463 hname, sizeof hname, NULL, 0, NI_NAMEREQD);
1464 sigprocmask(SIG_SETMASK, &omask, NULL);
1465 if (error) {
1466 dprintf("Host name for your address (%s) unknown\n", ip);
1467 return (ip);
1468 }
1469 hl = strlen(hname);
1470 if (hl > 0 && hname[hl-1] == '.')
1471 hname[--hl] = '\0';
1472 trimdomain(hname, hl);
1473 return (hname);
1474 }
1475
1476 static void
1477 dodie(int signo)
1478 {
1479
1480 WantDie = signo;
1481 }
1482
1483 static void
1484 domark(int signo __unused)
1485 {
1486
1487 MarkSet = 1;
1488 }
1489
1490 /*
1491 * Print syslogd errors some place.
1492 */
1493 static void
1494 logerror(const char *type)
1495 {
1496 char buf[512];
1497 static int recursed = 0;
1498
1499 /* If there's an error while trying to log an error, give up. */
1500 if (recursed)
1501 return;
1502 recursed++;
1503 if (errno)
1504 snprintf(buf,
1505 sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1506 else
1507 snprintf(buf, sizeof buf, "syslogd: %s", type);
1508 errno = 0;
1509 dprintf("%s\n", buf);
1510 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1511 recursed--;
1512 }
1513
1514 static void
1515 die(int signo)
1516 {
1517 struct filed *f;
1518 struct funix *fx;
1519 int was_initialized;
1520 char buf[100];
1521
1522 was_initialized = Initialized;
1523 Initialized = 0; /* Don't log SIGCHLDs. */
1524 for (f = Files; f != NULL; f = f->f_next) {
1525 /* flush any pending output */
1526 if (f->f_prevcount)
1527 fprintlog(f, 0, NULL);
1528 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) {
1529 close(f->f_file);
1530 f->f_un.f_pipe.f_pid = 0;
1531 }
1532 }
1533 Initialized = was_initialized;
1534 if (signo) {
1535 dprintf("syslogd: exiting on signal %d\n", signo);
1536 snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1537 errno = 0;
1538 logerror(buf);
1539 }
1540 STAILQ_FOREACH(fx, &funixes, next)
1541 unlink(fx->name);
1542 pidfile_remove(pfh);
1543
1544 exit(1);
1545 }
1546
1547 /*
1548 * INIT -- Initialize syslogd from configuration table
1549 */
1550 static void
1551 init(int signo)
1552 {
1553 int i;
1554 FILE *cf;
1555 struct filed *f, *next, **nextp;
1556 char *p;
1557 char cline[LINE_MAX];
1558 char prog[NAME_MAX+1];
1559 char host[MAXHOSTNAMELEN];
1560 char oldLocalHostName[MAXHOSTNAMELEN];
1561 char hostMsg[2*MAXHOSTNAMELEN+40];
1562 char bootfileMsg[LINE_MAX];
1563
1564 dprintf("init\n");
1565
1566 /*
1567 * Load hostname (may have changed).
1568 */
1569 if (signo != 0)
1570 strlcpy(oldLocalHostName, LocalHostName,
1571 sizeof(oldLocalHostName));
1572 if (gethostname(LocalHostName, sizeof(LocalHostName)))
1573 err(EX_OSERR, "gethostname() failed");
1574 if ((p = strchr(LocalHostName, '.')) != NULL) {
1575 *p++ = '\0';
1576 LocalDomain = p;
1577 } else {
1578 LocalDomain = "";
1579 }
1580
1581 /*
1582 * Close all open log files.
1583 */
1584 Initialized = 0;
1585 for (f = Files; f != NULL; f = next) {
1586 /* flush any pending output */
1587 if (f->f_prevcount)
1588 fprintlog(f, 0, NULL);
1589
1590 switch (f->f_type) {
1591 case F_FILE:
1592 case F_FORW:
1593 case F_CONSOLE:
1594 case F_TTY:
1595 close(f->f_file);
1596 break;
1597 case F_PIPE:
1598 if (f->f_un.f_pipe.f_pid > 0) {
1599 close(f->f_file);
1600 deadq_enter(f->f_un.f_pipe.f_pid,
1601 f->f_un.f_pipe.f_pname);
1602 }
1603 f->f_un.f_pipe.f_pid = 0;
1604 break;
1605 case F_RING:
1606 munmap(f->f_un.f_ring.f_footer,
1607 sizeof(struct clog_footer));
1608 close(f->f_file);
1609 break;
1610 }
1611 next = f->f_next;
1612 if (f->f_program) free(f->f_program);
1613 if (f->f_host) free(f->f_host);
1614 free((char *)f);
1615 }
1616 Files = NULL;
1617 nextp = &Files;
1618
1619 /* open the configuration file */
1620 if ((cf = fopen(ConfFile, "r")) == NULL) {
1621 dprintf("cannot open %s\n", ConfFile);
1622 *nextp = (struct filed *)calloc(1, sizeof(*f));
1623 if (*nextp == NULL) {
1624 logerror("calloc");
1625 exit(1);
1626 }
1627 cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1628 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1629 if ((*nextp)->f_next == NULL) {
1630 logerror("calloc");
1631 exit(1);
1632 }
1633 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1634 Initialized = 1;
1635 return;
1636 }
1637
1638 /*
1639 * Foreach line in the conf table, open that file.
1640 */
1641 f = NULL;
1642 strlcpy(host, "*", sizeof(host));
1643 strlcpy(prog, "*", sizeof(prog));
1644 while (fgets(cline, sizeof(cline), cf) != NULL) {
1645 /*
1646 * check for end-of-section, comments, strip off trailing
1647 * spaces and newline character. #!prog is treated specially:
1648 * following lines apply only to that program.
1649 */
1650 for (p = cline; isspace(*p); ++p)
1651 continue;
1652 if (*p == 0)
1653 continue;
1654 if (*p == '#') {
1655 p++;
1656 if (*p != '!' && *p != '+' && *p != '-')
1657 continue;
1658 }
1659 if (*p == '+' || *p == '-') {
1660 host[0] = *p++;
1661 while (isspace(*p))
1662 p++;
1663 if ((!*p) || (*p == '*')) {
1664 strlcpy(host, "*", sizeof(host));
1665 continue;
1666 }
1667 if (*p == '@')
1668 p = LocalHostName;
1669 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1670 if (!isalnum(*p) && *p != '.' && *p != '-'
1671 && *p != ',' && *p != ':' && *p != '%')
1672 break;
1673 host[i] = *p++;
1674 }
1675 host[i] = '\0';
1676 continue;
1677 }
1678 if (*p == '!') {
1679 p++;
1680 while (isspace(*p)) p++;
1681 if ((!*p) || (*p == '*')) {
1682 strlcpy(prog, "*", sizeof(prog));
1683 continue;
1684 }
1685 for (i = 0; i < NAME_MAX; i++) {
1686 if (!isprint(p[i]) || isspace(p[i]))
1687 break;
1688 prog[i] = p[i];
1689 }
1690 prog[i] = 0;
1691 continue;
1692 }
1693 for (p = cline + 1; *p != '\0'; p++) {
1694 if (*p != '#')
1695 continue;
1696 if (*(p - 1) == '\\') {
1697 strcpy(p - 1, p);
1698 p--;
1699 continue;
1700 }
1701 *p = '\0';
1702 break;
1703 }
1704 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1705 cline[i] = '\0';
1706 f = (struct filed *)calloc(1, sizeof(*f));
1707 if (f == NULL) {
1708 logerror("calloc");
1709 exit(1);
1710 }
1711 *nextp = f;
1712 nextp = &f->f_next;
1713 cfline(cline, f, prog, host);
1714 }
1715
1716 /* close the configuration file */
1717 fclose(cf);
1718
1719 Initialized = 1;
1720
1721 if (Debug) {
1722 int port;
1723 for (f = Files; f; f = f->f_next) {
1724 for (i = 0; i <= LOG_NFACILITIES; i++)
1725 if (f->f_pmask[i] == INTERNAL_NOPRI)
1726 printf("X ");
1727 else
1728 printf("%d ", f->f_pmask[i]);
1729 printf("%s: ", TypeNames[f->f_type]);
1730 switch (f->f_type) {
1731 case F_FILE:
1732 printf("%s", f->f_un.f_fname);
1733 break;
1734
1735 case F_CONSOLE:
1736 case F_TTY:
1737 printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1738 break;
1739
1740 case F_FORW:
1741 port = (int)ntohs(((struct sockaddr_in *)
1742 (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1743 if (port != 514) {
1744 printf("%s:%d",
1745 f->f_un.f_forw.f_hname, port);
1746 } else {
1747 printf("%s", f->f_un.f_forw.f_hname);
1748 }
1749 break;
1750
1751 case F_RING:
1752 printf("%s", f->f_un.f_ring.f_rname);
1753 break;
1754
1755 case F_PIPE:
1756 printf("%s", f->f_un.f_pipe.f_pname);
1757 break;
1758
1759 case F_USERS:
1760 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1761 printf("%s, ", f->f_un.f_uname[i]);
1762 break;
1763 }
1764 if (f->f_program)
1765 printf(" (%s)", f->f_program);
1766 printf("\n");
1767 }
1768 }
1769
1770 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1771 dprintf("syslogd: restarted\n");
1772 /*
1773 * Log a change in hostname, but only on a restart.
1774 */
1775 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1776 snprintf(hostMsg, sizeof(hostMsg),
1777 "syslogd: hostname changed, \"%s\" to \"%s\"",
1778 oldLocalHostName, LocalHostName);
1779 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1780 dprintf("%s\n", hostMsg);
1781 }
1782 /*
1783 * Log the kernel boot file if we aren't going to use it as
1784 * the prefix, and if this is *not* a restart.
1785 */
1786 if (signo == 0 && !use_bootfile) {
1787 snprintf(bootfileMsg, sizeof(bootfileMsg),
1788 "syslogd: kernel boot file is %s", bootfile);
1789 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1790 dprintf("%s\n", bootfileMsg);
1791 }
1792 }
1793
1794 /*
1795 * Crack a configuration file line
1796 */
1797 static void
1798 cfline(const char *line, struct filed *f, const char *prog, const char *host)
1799 {
1800 struct addrinfo hints, *res;
1801 int error, i, pri, syncfile;
1802 const char *p, *q;
1803 char *bp;
1804 char buf[MAXLINE], ebuf[100];
1805 struct stat sb;
1806
1807 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1808
1809 errno = 0; /* keep strerror() stuff out of logerror messages */
1810
1811 /* clear out file entry */
1812 memset(f, 0, sizeof(*f));
1813 for (i = 0; i <= LOG_NFACILITIES; i++)
1814 f->f_pmask[i] = INTERNAL_NOPRI;
1815
1816 /* save hostname if any */
1817 if (host && *host == '*')
1818 host = NULL;
1819 if (host) {
1820 int hl;
1821
1822 f->f_host = strdup(host);
1823 if (f->f_host == NULL) {
1824 logerror("strdup");
1825 exit(1);
1826 }
1827 hl = strlen(f->f_host);
1828 if (hl > 0 && f->f_host[hl-1] == '.')
1829 f->f_host[--hl] = '\0';
1830 trimdomain(f->f_host, hl);
1831 }
1832
1833 /* save program name if any */
1834 if (prog && *prog == '*')
1835 prog = NULL;
1836 if (prog) {
1837 f->f_program = strdup(prog);
1838 if (f->f_program == NULL) {
1839 logerror("strdup");
1840 exit(1);
1841 }
1842 }
1843
1844 /* scan through the list of selectors */
1845 for (p = line; *p && *p != '\t' && *p != ' ';) {
1846 int pri_done;
1847 int pri_cmp;
1848 int pri_invert;
1849
1850 /* find the end of this facility name list */
1851 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1852 continue;
1853
1854 /* get the priority comparison */
1855 pri_cmp = 0;
1856 pri_done = 0;
1857 pri_invert = 0;
1858 if (*q == '!') {
1859 pri_invert = 1;
1860 q++;
1861 }
1862 while (!pri_done) {
1863 switch (*q) {
1864 case '<':
1865 pri_cmp |= PRI_LT;
1866 q++;
1867 break;
1868 case '=':
1869 pri_cmp |= PRI_EQ;
1870 q++;
1871 break;
1872 case '>':
1873 pri_cmp |= PRI_GT;
1874 q++;
1875 break;
1876 default:
1877 pri_done++;
1878 break;
1879 }
1880 }
1881
1882 /* collect priority name */
1883 for (bp = buf; *q && !strchr("\t,; ", *q); )
1884 *bp++ = *q++;
1885 *bp = '\0';
1886
1887 /* skip cruft */
1888 while (strchr(",;", *q))
1889 q++;
1890
1891 /* decode priority name */
1892 if (*buf == '*') {
1893 pri = LOG_PRIMASK;
1894 pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1895 } else {
1896 /* Ignore trailing spaces. */
1897 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
1898 buf[i] = '\0';
1899
1900 pri = decode(buf, prioritynames);
1901 if (pri < 0) {
1902 snprintf(ebuf, sizeof ebuf,
1903 "unknown priority name \"%s\"", buf);
1904 logerror(ebuf);
1905 return;
1906 }
1907 }
1908 if (!pri_cmp)
1909 pri_cmp = (UniquePriority)
1910 ? (PRI_EQ)
1911 : (PRI_EQ | PRI_GT)
1912 ;
1913 if (pri_invert)
1914 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
1915
1916 /* scan facilities */
1917 while (*p && !strchr("\t.; ", *p)) {
1918 for (bp = buf; *p && !strchr("\t,;. ", *p); )
1919 *bp++ = *p++;
1920 *bp = '\0';
1921
1922 if (*buf == '*') {
1923 for (i = 0; i < LOG_NFACILITIES; i++) {
1924 f->f_pmask[i] = pri;
1925 f->f_pcmp[i] = pri_cmp;
1926 }
1927 } else {
1928 i = decode(buf, facilitynames);
1929 if (i < 0) {
1930 snprintf(ebuf, sizeof ebuf,
1931 "unknown facility name \"%s\"",
1932 buf);
1933 logerror(ebuf);
1934 return;
1935 }
1936 f->f_pmask[i >> 3] = pri;
1937 f->f_pcmp[i >> 3] = pri_cmp;
1938 }
1939 while (*p == ',' || *p == ' ')
1940 p++;
1941 }
1942
1943 p = q;
1944 }
1945
1946 /* skip to action part */
1947 while (*p == '\t' || *p == ' ')
1948 p++;
1949
1950 if (*p == '-') {
1951 syncfile = 0;
1952 p++;
1953 } else
1954 syncfile = 1;
1955
1956 switch (*p) {
1957 case '@':
1958 {
1959 char *tp;
1960 /*
1961 * scan forward to see if there is a port defined.
1962 * so we can't use strlcpy..
1963 */
1964 i = sizeof(f->f_un.f_forw.f_hname);
1965 tp = f->f_un.f_forw.f_hname;
1966 p++;
1967
1968 while (*p && (*p != ':') && (i-- > 0)) {
1969 *tp++ = *p++;
1970 }
1971 *tp = '\0';
1972 }
1973 /* See if we copied a domain and have a port */
1974 if (*p == ':')
1975 p++;
1976 else
1977 p = NULL;
1978
1979 memset(&hints, 0, sizeof(hints));
1980 hints.ai_family = family;
1981 hints.ai_socktype = SOCK_DGRAM;
1982 error = getaddrinfo(f->f_un.f_forw.f_hname,
1983 p ? p : "syslog", &hints, &res);
1984 if (error) {
1985 logerror(gai_strerror(error));
1986 break;
1987 }
1988 f->f_un.f_forw.f_addr = res;
1989 f->f_type = F_FORW;
1990 break;
1991
1992 case '/':
1993 if ((f->f_file = open(p, logflags, 0600)) < 0) {
1994 f->f_type = F_UNUSED;
1995 logerror(p);
1996 break;
1997 }
1998 if (syncfile)
1999 f->f_flags |= FFLAG_SYNC;
2000 if (isatty(f->f_file)) {
2001 if (strcmp(p, ctty) == 0)
2002 f->f_type = F_CONSOLE;
2003 else
2004 f->f_type = F_TTY;
2005 strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
2006 sizeof(f->f_un.f_fname));
2007 } else {
2008 strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
2009 f->f_type = F_FILE;
2010 }
2011 break;
2012
2013 case '%':
2014 if ((f->f_file = open(p + 1, O_RDWR, 0 )) < 0) {
2015 f->f_type = F_UNUSED;
2016 logerror(p + 1);
2017 break;
2018 }
2019 if (fstat(f->f_file,&sb) < 0) {
2020 close(f->f_file);
2021 f->f_type = F_UNUSED;
2022 logerror(p+1);
2023 break;
2024 }
2025 f->f_un.f_ring.f_footer =
2026 mmap(NULL, sizeof(struct clog_footer),
2027 PROT_READ|PROT_WRITE, MAP_SHARED,
2028 f->f_file, sb.st_size-sizeof(struct clog_footer));
2029 if (f->f_un.f_ring.f_footer == NULL) {
2030 close(f->f_file);
2031 f->f_type = F_UNUSED;
2032 logerror(p + 1);
2033 break;
2034 }
2035 if (memcmp(&(f->f_un.f_ring.f_footer->cf_magic), MAGIC_CONST, 4) != 0) {
2036 munmap(f->f_un.f_ring.f_footer,
2037 sizeof(struct clog_footer));
2038 close(f->f_file);
2039 f->f_type = F_UNUSED;
2040 errno = ENODEV;
2041 logerror(p + 1);
2042 break;
2043 }
2044 f->f_un.f_ring.f_size = sb.st_size;
2045 strcpy(f->f_un.f_ring.f_rname, p + 1);
2046 f->f_type = F_RING;
2047 break;
2048
2049 case '|':
2050 f->f_un.f_pipe.f_pid = 0;
2051 strlcpy(f->f_un.f_pipe.f_pname, p + 1,
2052 sizeof(f->f_un.f_pipe.f_pname));
2053 f->f_type = F_PIPE;
2054 break;
2055
2056 case '*':
2057 f->f_type = F_WALL;
2058 break;
2059
2060 default:
2061 for (i = 0; i < MAXUNAMES && *p; i++) {
2062 for (q = p; *q && *q != ','; )
2063 q++;
2064 strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
2065 if ((q - p) > UT_NAMESIZE)
2066 f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
2067 else
2068 f->f_un.f_uname[i][q - p] = '\0';
2069 while (*q == ',' || *q == ' ')
2070 q++;
2071 p = q;
2072 }
2073 f->f_type = F_USERS;
2074 break;
2075 }
2076 }
2077
2078
2079 /*
2080 * Decode a symbolic name to a numeric value
2081 */
2082 static int
2083 decode(const char *name, CODE *codetab)
2084 {
2085 CODE *c;
2086 char *p, buf[40];
2087
2088 if (isdigit(*name))
2089 return (atoi(name));
2090
2091 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2092 if (isupper(*name))
2093 *p = tolower(*name);
2094 else
2095 *p = *name;
2096 }
2097 *p = '\0';
2098 for (c = codetab; c->c_name; c++)
2099 if (!strcmp(buf, c->c_name))
2100 return (c->c_val);
2101
2102 return (-1);
2103 }
2104
2105 static void
2106 markit(void)
2107 {
2108 struct filed *f;
2109 dq_t q, next;
2110
2111 now = time(NULL);
2112 MarkSeq += TIMERINTVL;
2113 if (MarkSeq >= MarkInterval) {
2114 logmsg(LOG_INFO, "-- MARK --",
2115 LocalHostName, ADDDATE|MARK);
2116 MarkSeq = 0;
2117 }
2118
2119 for (f = Files; f; f = f->f_next) {
2120 if (f->f_prevcount && now >= REPEATTIME(f)) {
2121 dprintf("flush %s: repeated %d times, %d sec.\n",
2122 TypeNames[f->f_type], f->f_prevcount,
2123 repeatinterval[f->f_repeatcount]);
2124 fprintlog(f, 0, NULL);
2125 BACKOFF(f);
2126 }
2127 }
2128
2129 /* Walk the dead queue, and see if we should signal somebody. */
2130 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2131 next = TAILQ_NEXT(q, dq_entries);
2132
2133 switch (q->dq_timeout) {
2134 case 0:
2135 /* Already signalled once, try harder now. */
2136 if (kill(q->dq_pid, SIGKILL) != 0)
2137 deadq_remove(q->dq_pid);
2138 break;
2139
2140 case 1:
2141 /*
2142 * Timed out on dead queue, send terminate
2143 * signal. Note that we leave the removal
2144 * from the dead queue to reapchild(), which
2145 * will also log the event (unless the process
2146 * didn't even really exist, in case we simply
2147 * drop it from the dead queue).
2148 */
2149 if (kill(q->dq_pid, SIGTERM) != 0)
2150 deadq_remove(q->dq_pid);
2151 /* FALLTHROUGH */
2152
2153 default:
2154 q->dq_timeout--;
2155 }
2156 }
2157 MarkSet = 0;
2158 alarm(TIMERINTVL);
2159 }
2160
2161 /*
2162 * fork off and become a daemon, but wait for the child to come online
2163 * before returing to the parent, or we get disk thrashing at boot etc.
2164 * Set a timer so we don't hang forever if it wedges.
2165 */
2166 static int
2167 waitdaemon(int nochdir, int noclose, int maxwait)
2168 {
2169 int fd;
2170 int status;
2171 pid_t pid, childpid;
2172
2173 switch (childpid = fork()) {
2174 case -1:
2175 return (-1);
2176 case 0:
2177 break;
2178 default:
2179 signal(SIGALRM, timedout);
2180 alarm(maxwait);
2181 while ((pid = wait3(&status, 0, NULL)) != -1) {
2182 if (WIFEXITED(status))
2183 errx(1, "child pid %d exited with return code %d",
2184 pid, WEXITSTATUS(status));
2185 if (WIFSIGNALED(status))
2186 errx(1, "child pid %d exited on signal %d%s",
2187 pid, WTERMSIG(status),
2188 WCOREDUMP(status) ? " (core dumped)" :
2189 "");
2190 if (pid == childpid) /* it's gone... */
2191 break;
2192 }
2193 exit(0);
2194 }
2195
2196 if (setsid() == -1)
2197 return (-1);
2198
2199 if (!nochdir)
2200 chdir("/");
2201
2202 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2203 dup2(fd, STDIN_FILENO);
2204 dup2(fd, STDOUT_FILENO);
2205 dup2(fd, STDERR_FILENO);
2206 if (fd > 2)
2207 close (fd);
2208 }
2209 return (getppid());
2210 }
2211
2212 /*
2213 * We get a SIGALRM from the child when it's running and finished doing it's
2214 * fsync()'s or O_SYNC writes for all the boot messages.
2215 *
2216 * We also get a signal from the kernel if the timer expires, so check to
2217 * see what happened.
2218 */
2219 static void
2220 timedout(int sig __unused)
2221 {
2222 int left;
2223 left = alarm(0);
2224 signal(SIGALRM, SIG_DFL);
2225 if (left == 0)
2226 errx(1, "timed out waiting for child");
2227 else
2228 _exit(0);
2229 }
2230
2231 /*
2232 * Add `s' to the list of allowable peer addresses to accept messages
2233 * from.
2234 *
2235 * `s' is a string in the form:
2236 *
2237 * [*]domainname[:{servicename|portnumber|*}]
2238 *
2239 * or
2240 *
2241 * netaddr/maskbits[:{servicename|portnumber|*}]
2242 *
2243 * Returns -1 on error, 0 if the argument was valid.
2244 */
2245 static int
2246 allowaddr(char *s)
2247 {
2248 char *cp1, *cp2;
2249 struct allowedpeer ap;
2250 struct servent *se;
2251 int masklen = -1;
2252 struct addrinfo hints, *res;
2253 struct in_addr *addrp, *maskp;
2254 #ifdef INET6
2255 int i;
2256 u_int32_t *addr6p, *mask6p;
2257 #endif
2258 char ip[NI_MAXHOST];
2259
2260 #ifdef INET6
2261 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2262 #endif
2263 cp1 = s;
2264 if ((cp1 = strrchr(cp1, ':'))) {
2265 /* service/port provided */
2266 *cp1++ = '\0';
2267 if (strlen(cp1) == 1 && *cp1 == '*')
2268 /* any port allowed */
2269 ap.port = 0;
2270 else if ((se = getservbyname(cp1, "udp"))) {
2271 ap.port = ntohs(se->s_port);
2272 } else {
2273 ap.port = strtol(cp1, &cp2, 0);
2274 if (*cp2 != '\0')
2275 return (-1); /* port not numeric */
2276 }
2277 } else {
2278 if ((se = getservbyname("syslog", "udp")))
2279 ap.port = ntohs(se->s_port);
2280 else
2281 /* sanity, should not happen */
2282 ap.port = 514;
2283 }
2284
2285 if ((cp1 = strchr(s, '/')) != NULL &&
2286 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2287 *cp1 = '\0';
2288 if ((masklen = atoi(cp1 + 1)) < 0)
2289 return (-1);
2290 }
2291 #ifdef INET6
2292 if (*s == '[') {
2293 cp2 = s + strlen(s) - 1;
2294 if (*cp2 == ']') {
2295 ++s;
2296 *cp2 = '\0';
2297 } else {
2298 cp2 = NULL;
2299 }
2300 } else {
2301 cp2 = NULL;
2302 }
2303 #endif
2304 memset(&hints, 0, sizeof(hints));
2305 hints.ai_family = PF_UNSPEC;
2306 hints.ai_socktype = SOCK_DGRAM;
2307 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2308 if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2309 ap.isnumeric = 1;
2310 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2311 memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2312 ap.a_mask.ss_family = res->ai_family;
2313 if (res->ai_family == AF_INET) {
2314 ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2315 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2316 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2317 if (masklen < 0) {
2318 /* use default netmask */
2319 if (IN_CLASSA(ntohl(addrp->s_addr)))
2320 maskp->s_addr = htonl(IN_CLASSA_NET);
2321 else if (IN_CLASSB(ntohl(addrp->s_addr)))
2322 maskp->s_addr = htonl(IN_CLASSB_NET);
2323 else
2324 maskp->s_addr = htonl(IN_CLASSC_NET);
2325 } else if (masklen <= 32) {
2326 /* convert masklen to netmask */
2327 if (masklen == 0)
2328 maskp->s_addr = 0;
2329 else
2330 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2331 } else {
2332 freeaddrinfo(res);
2333 return (-1);
2334 }
2335 /* Lose any host bits in the network number. */
2336 addrp->s_addr &= maskp->s_addr;
2337 }
2338 #ifdef INET6
2339 else if (res->ai_family == AF_INET6 && masklen <= 128) {
2340 ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2341 if (masklen < 0)
2342 masklen = 128;
2343 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2344 /* convert masklen to netmask */
2345 while (masklen > 0) {
2346 if (masklen < 32) {
2347 *mask6p = htonl(~(0xffffffff >> masklen));
2348 break;
2349 }
2350 *mask6p++ = 0xffffffff;
2351 masklen -= 32;
2352 }
2353 /* Lose any host bits in the network number. */
2354 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2355 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2356 for (i = 0; i < 4; i++)
2357 addr6p[i] &= mask6p[i];
2358 }
2359 #endif
2360 else {
2361 freeaddrinfo(res);
2362 return (-1);
2363 }
2364 freeaddrinfo(res);
2365 } else {
2366 /* arg `s' is domain name */
2367 ap.isnumeric = 0;
2368 ap.a_name = s;
2369 if (cp1)
2370 *cp1 = '/';
2371 #ifdef INET6
2372 if (cp2) {
2373 *cp2 = ']';
2374 --s;
2375 }
2376 #endif
2377 }
2378
2379 if (Debug) {
2380 printf("allowaddr: rule %d: ", NumAllowed);
2381 if (ap.isnumeric) {
2382 printf("numeric, ");
2383 getnameinfo((struct sockaddr *)&ap.a_addr,
2384 ((struct sockaddr *)&ap.a_addr)->sa_len,
2385 ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2386 printf("addr = %s, ", ip);
2387 getnameinfo((struct sockaddr *)&ap.a_mask,
2388 ((struct sockaddr *)&ap.a_mask)->sa_len,
2389 ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2390 printf("mask = %s; ", ip);
2391 } else {
2392 printf("domainname = %s; ", ap.a_name);
2393 }
2394 printf("port = %d\n", ap.port);
2395 }
2396
2397 if ((AllowedPeers = realloc(AllowedPeers,
2398 ++NumAllowed * sizeof(struct allowedpeer)))
2399 == NULL) {
2400 logerror("realloc");
2401 exit(1);
2402 }
2403 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2404 return (0);
2405 }
2406
2407 /*
2408 * Validate that the remote peer has permission to log to us.
2409 */
2410 static int
2411 validate(struct sockaddr *sa, const char *hname)
2412 {
2413 int i;
2414 size_t l1, l2;
2415 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2416 struct allowedpeer *ap;
2417 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2418 #ifdef INET6
2419 int j, reject;
2420 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2421 #endif
2422 struct addrinfo hints, *res;
2423 u_short sport;
2424
2425 if (NumAllowed == 0)
2426 /* traditional behaviour, allow everything */
2427 return (1);
2428
2429 strlcpy(name, hname, sizeof(name));
2430 memset(&hints, 0, sizeof(hints));
2431 hints.ai_family = PF_UNSPEC;
2432 hints.ai_socktype = SOCK_DGRAM;
2433 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2434 if (getaddrinfo(name, NULL, &hints, &res) == 0)
2435 freeaddrinfo(res);
2436 else if (strchr(name, '.') == NULL) {
2437 strlcat(name, ".", sizeof name);
2438 strlcat(name, LocalDomain, sizeof name);
2439 }
2440 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2441 NI_NUMERICHOST | NI_NUMERICSERV) != 0)
2442 return (0); /* for safety, should not occur */
2443 dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2444 ip, port, name);
2445 sport = atoi(port);
2446
2447 /* now, walk down the list */
2448 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2449 if (ap->port != 0 && ap->port != sport) {
2450 dprintf("rejected in rule %d due to port mismatch.\n", i);
2451 continue;
2452 }
2453
2454 if (ap->isnumeric) {
2455 if (ap->a_addr.ss_family != sa->sa_family) {
2456 dprintf("rejected in rule %d due to address family mismatch.\n", i);
2457 continue;
2458 }
2459 if (ap->a_addr.ss_family == AF_INET) {
2460 sin4 = (struct sockaddr_in *)sa;
2461 a4p = (struct sockaddr_in *)&ap->a_addr;
2462 m4p = (struct sockaddr_in *)&ap->a_mask;
2463 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2464 != a4p->sin_addr.s_addr) {
2465 dprintf("rejected in rule %d due to IP mismatch.\n", i);
2466 continue;
2467 }
2468 }
2469 #ifdef INET6
2470 else if (ap->a_addr.ss_family == AF_INET6) {
2471 sin6 = (struct sockaddr_in6 *)sa;
2472 a6p = (struct sockaddr_in6 *)&ap->a_addr;
2473 m6p = (struct sockaddr_in6 *)&ap->a_mask;
2474 if (a6p->sin6_scope_id != 0 &&
2475 sin6->sin6_scope_id != a6p->sin6_scope_id) {
2476 dprintf("rejected in rule %d due to scope mismatch.\n", i);
2477 continue;
2478 }
2479 reject = 0;
2480 for (j = 0; j < 16; j += 4) {
2481 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2482 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2483 ++reject;
2484 break;
2485 }
2486 }
2487 if (reject) {
2488 dprintf("rejected in rule %d due to IP mismatch.\n", i);
2489 continue;
2490 }
2491 }
2492 #endif
2493 else
2494 continue;
2495 } else {
2496 cp = ap->a_name;
2497 l1 = strlen(name);
2498 if (*cp == '*') {
2499 /* allow wildmatch */
2500 cp++;
2501 l2 = strlen(cp);
2502 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2503 dprintf("rejected in rule %d due to name mismatch.\n", i);
2504 continue;
2505 }
2506 } else {
2507 /* exact match */
2508 l2 = strlen(cp);
2509 if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2510 dprintf("rejected in rule %d due to name mismatch.\n", i);
2511 continue;
2512 }
2513 }
2514 }
2515 dprintf("accepted in rule %d.\n", i);
2516 return (1); /* hooray! */
2517 }
2518 return (0);
2519 }
2520
2521 /*
2522 * Fairly similar to popen(3), but returns an open descriptor, as
2523 * opposed to a FILE *.
2524 */
2525 static int
2526 p_open(const char *prog, pid_t *rpid)
2527 {
2528 int pfd[2], nulldesc, i;
2529 pid_t pid;
2530 sigset_t omask, mask;
2531 char *argv[4]; /* sh -c cmd NULL */
2532 char errmsg[200];
2533
2534 if (pipe(pfd) == -1)
2535 return (-1);
2536 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2537 /* we are royally screwed anyway */
2538 return (-1);
2539
2540 sigemptyset(&mask);
2541 sigaddset(&mask, SIGALRM);
2542 sigaddset(&mask, SIGHUP);
2543 sigprocmask(SIG_BLOCK, &mask, &omask);
2544 switch ((pid = fork())) {
2545 case -1:
2546 sigprocmask(SIG_SETMASK, &omask, 0);
2547 close(nulldesc);
2548 return (-1);
2549
2550 case 0:
2551 argv[0] = strdup("sh");
2552 argv[1] = strdup("-c");
2553 argv[2] = strdup(prog);
2554 argv[3] = NULL;
2555 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2556 logerror("strdup");
2557 exit(1);
2558 }
2559
2560 alarm(0);
2561 setsid(); /* Avoid catching SIGHUPs. */
2562
2563 /*
2564 * Throw away pending signals, and reset signal
2565 * behaviour to standard values.
2566 */
2567 signal(SIGALRM, SIG_IGN);
2568 signal(SIGHUP, SIG_IGN);
2569 sigprocmask(SIG_SETMASK, &omask, 0);
2570 signal(SIGPIPE, SIG_DFL);
2571 signal(SIGQUIT, SIG_DFL);
2572 signal(SIGALRM, SIG_DFL);
2573 signal(SIGHUP, SIG_DFL);
2574
2575 dup2(pfd[0], STDIN_FILENO);
2576 dup2(nulldesc, STDOUT_FILENO);
2577 dup2(nulldesc, STDERR_FILENO);
2578 for (i = getdtablesize(); i > 2; i--)
2579 close(i);
2580
2581 execvp(_PATH_BSHELL, argv);
2582 _exit(255);
2583 }
2584
2585 sigprocmask(SIG_SETMASK, &omask, 0);
2586 close(nulldesc);
2587 close(pfd[0]);
2588 /*
2589 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are
2590 * supposed to get an EWOULDBLOCK on writev(2), which is
2591 * caught by the logic above anyway, which will in turn close
2592 * the pipe, and fork a new logging subprocess if necessary.
2593 * The stale subprocess will be killed some time later unless
2594 * it terminated itself due to closing its input pipe (so we
2595 * get rid of really dead puppies).
2596 */
2597 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2598 /* This is bad. */
2599 snprintf(errmsg, sizeof errmsg,
2600 "Warning: cannot change pipe to PID %d to "
2601 "non-blocking behaviour.",
2602 (int)pid);
2603 logerror(errmsg);
2604 }
2605 *rpid = pid;
2606 return (pfd[1]);
2607 }
2608
2609 static void
2610 deadq_enter(pid_t pid, const char *name)
2611 {
2612 dq_t p;
2613 int status;
2614
2615 /*
2616 * Be paranoid, if we can't signal the process, don't enter it
2617 * into the dead queue (perhaps it's already dead). If possible,
2618 * we try to fetch and log the child's status.
2619 */
2620 if (kill(pid, 0) != 0) {
2621 if (waitpid(pid, &status, WNOHANG) > 0)
2622 log_deadchild(pid, status, name);
2623 return;
2624 }
2625
2626 p = malloc(sizeof(struct deadq_entry));
2627 if (p == NULL) {
2628 logerror("malloc");
2629 exit(1);
2630 }
2631
2632 p->dq_pid = pid;
2633 p->dq_timeout = DQ_TIMO_INIT;
2634 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2635 }
2636
2637 static int
2638 deadq_remove(pid_t pid)
2639 {
2640 dq_t q;
2641
2642 TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2643 if (q->dq_pid == pid) {
2644 TAILQ_REMOVE(&deadq_head, q, dq_entries);
2645 free(q);
2646 return (1);
2647 }
2648 }
2649
2650 return (0);
2651 }
2652
2653 static void
2654 log_deadchild(pid_t pid, int status, const char *name)
2655 {
2656 int code;
2657 char buf[256];
2658 const char *reason;
2659
2660 errno = 0; /* Keep strerror() stuff out of logerror messages. */
2661 if (WIFSIGNALED(status)) {
2662 reason = "due to signal";
2663 code = WTERMSIG(status);
2664 } else {
2665 reason = "with status";
2666 code = WEXITSTATUS(status);
2667 if (code == 0)
2668 return;
2669 }
2670 snprintf(buf, sizeof buf,
2671 "Logging subprocess %d (%s) exited %s %d.",
2672 pid, name, reason, code);
2673 logerror(buf);
2674 }
2675
2676 static int *
2677 socksetup(int af, const char *bindhostname)
2678 {
2679 struct addrinfo hints, *res, *r;
2680 int error, maxs, *s, *socks;
2681
2682 memset(&hints, 0, sizeof(hints));
2683 hints.ai_flags = AI_PASSIVE;
2684 hints.ai_family = af;
2685 hints.ai_socktype = SOCK_DGRAM;
2686 error = getaddrinfo(bindhostname, "syslog", &hints, &res);
2687 if (error) {
2688 logerror(gai_strerror(error));
2689 errno = 0;
2690 die(0);
2691 }
2692
2693 /* Count max number of sockets we may open */
2694 for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2695 socks = malloc((maxs+1) * sizeof(int));
2696 if (socks == NULL) {
2697 logerror("couldn't allocate memory for sockets");
2698 die(0);
2699 }
2700
2701 *socks = 0; /* num of sockets counter at start of array */
2702 s = socks + 1;
2703 for (r = res; r; r = r->ai_next) {
2704 int on = 1;
2705 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2706 if (*s < 0) {
2707 logerror("socket");
2708 continue;
2709 }
2710 if (r->ai_family == AF_INET6) {
2711 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2712 (char *)&on, sizeof (on)) < 0) {
2713 logerror("setsockopt");
2714 close(*s);
2715 continue;
2716 }
2717 }
2718 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
2719 (char *)&on, sizeof (on)) < 0) {
2720 logerror("setsockopt");
2721 close(*s);
2722 continue;
2723 }
2724 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2725 close(*s);
2726 logerror("bind");
2727 continue;
2728 }
2729
2730 double_rbuf(*s);
2731
2732 (*socks)++;
2733 s++;
2734 }
2735
2736 if (*socks == 0) {
2737 free(socks);
2738 if (Debug)
2739 return (NULL);
2740 else
2741 die(0);
2742 }
2743 if (res)
2744 freeaddrinfo(res);
2745
2746 return (socks);
2747 }
2748
2749 ssize_t
2750 rbwritev(struct filed *f, struct iovec *iov, int iovcnt)
2751 {
2752 int i;
2753 ssize_t out = 0;
2754 ssize_t error;
2755
2756 for (i = 0; i < iovcnt; i++) {
2757 error = rbwrite(f, iov[i].iov_base, iov[i].iov_len);
2758 if (error == -1)
2759 return (-1);
2760 out += error;
2761 }
2762 return (out);
2763 }
2764
2765
2766 ssize_t
2767 rbwrite(struct filed *f, char *buf, size_t nbytes)
2768 {
2769 size_t maxwrite;
2770 ssize_t error;
2771 ssize_t out;
2772
2773 maxwrite = f->f_un.f_ring.f_footer->cf_max -
2774 f->f_un.f_ring.f_footer->cf_next;
2775 out = 0;
2776
2777 f->f_un.f_ring.f_footer->cf_lock = 1;
2778 while (nbytes > 0) {
2779 maxwrite = f->f_un.f_ring.f_footer->cf_max -
2780 f->f_un.f_ring.f_footer->cf_next;
2781 if (maxwrite > nbytes)
2782 maxwrite = nbytes;
2783 error = pwrite(f->f_file, buf, maxwrite,
2784 f->f_un.f_ring.f_footer->cf_next);
2785 if (error == -1) {
2786 f->f_un.f_ring.f_footer->cf_lock = 0;
2787 return (-1);
2788 }
2789 nbytes -= error;
2790 out += error;
2791 buf += error;
2792 f->f_un.f_ring.f_footer->cf_next += error;
2793 if (f->f_un.f_ring.f_footer->cf_next ==
2794 f->f_un.f_ring.f_footer->cf_max) {
2795 f->f_un.f_ring.f_footer->cf_next = 0;
2796 f->f_un.f_ring.f_footer->cf_wrap = 1;
2797 }
2798 }
2799
2800 f->f_un.f_ring.f_footer->cf_lock = 0;
2801 return (out);
2802 }
2803
2804 static void
2805 double_rbuf(int fd)
2806 {
2807 socklen_t slen, len;
2808
2809 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
2810 len *= 2;
2811 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen);
2812 }
2813 }
DragonFly BSD