Bring in Jeff Wheelhouse's CLOG / circular log file support for syslogd,
[dragonfly.git] / usr.sbin / syslogd / syslogd.c
1 /*
2  * Copyright (c) 1983, 1988, 1993, 1994
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *      This product includes software developed by the University of
16  *      California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  * @(#) Copyright (c) 1983, 1988, 1993, 1994 The Regents of the University of California.  All rights reserved.
34  * @(#)syslogd.c        8.3 (Berkeley) 4/4/94
35  * $FreeBSD: src/usr.sbin/syslogd/syslogd.c,v 1.130 2004/07/04 19:52:48 cperciva Exp $
36  * $DragonFly: src/usr.sbin/syslogd/syslogd.c,v 1.4 2004/10/30 20:26:48 dillon Exp $
37  */
38
39 /*
40  *  syslogd -- log system messages
41  *
42  * This program implements a system log. It takes a series of lines.
43  * Each line may have a priority, signified as "<n>" as
44  * the first characters of the line.  If this is
45  * not present, a default priority is used.
46  *
47  * To kill syslogd, send a signal 15 (terminate).  A signal 1 (hup) will
48  * cause it to reread its configuration file.
49  *
50  * Defined Constants:
51  *
52  * MAXLINE -- the maximum line length that can be handled.
53  * DEFUPRI -- the default priority for user messages
54  * DEFSPRI -- the default priority for kernel messages
55  *
56  * Author: Eric Allman
57  * extensive changes by Ralph Campbell
58  * more extensive changes by Eric Allman (again)
59  * Extension to log by program name as well as facility and priority
60  *   by Peter da Silva.
61  * -u and -v by Harlan Stenn.
62  * Priority comparison code by Harlan Stenn.
63  * Ring buffer code by Jeff Wheelhouse.
64  */
65
66 #define MAXLINE         1024            /* maximum line length */
67 #define MAXSVLINE       120             /* maximum saved line length */
68 #define DEFUPRI         (LOG_USER|LOG_NOTICE)
69 #define DEFSPRI         (LOG_KERN|LOG_CRIT)
70 #define TIMERINTVL      30              /* interval for checking flush, mark */
71 #define TTYMSGTIME      1               /* timeout passed to ttymsg */
72
73 #include <sys/param.h>
74 #include <sys/ioctl.h>
75 #include <sys/stat.h>
76 #include <sys/wait.h>
77 #include <sys/socket.h>
78 #include <sys/queue.h>
79 #include <sys/uio.h>
80 #include <sys/un.h>
81 #include <sys/time.h>
82 #include <sys/resource.h>
83 #include <sys/syslimits.h>
84 #include <sys/mman.h>
85 #include <sys/types.h>
86
87 #include <netinet/in.h>
88 #include <netdb.h>
89 #include <arpa/inet.h>
90
91 #include <ctype.h>
92 #include <err.h>
93 #include <errno.h>
94 #include <fcntl.h>
95 #include <libutil.h>
96 #include <limits.h>
97 #include <paths.h>
98 #include <signal.h>
99 #include <stdio.h>
100 #include <stdlib.h>
101 #include <string.h>
102 #include <sysexits.h>
103 #include <unistd.h>
104 #include <utmp.h>
105
106 #include "pathnames.h"
107 #include "ttymsg.h"
108 #include "../clog/clog.h"
109
110 #define SYSLOG_NAMES
111 #include <sys/syslog.h>
112
113 #ifdef NI_WITHSCOPEID
114 static const int withscopeid = NI_WITHSCOPEID;
115 #else
116 static const int withscopeid;
117 #endif
118
119 const char      *ConfFile = _PATH_LOGCONF;
120 const char      *PidFile = _PATH_LOGPID;
121 const char      ctty[] = _PATH_CONSOLE;
122 const char      ring_magic[] = "CLOG";
123
124 #define dprintf         if (Debug) printf
125
126 #define MAXUNAMES       20      /* maximum number of user names */
127
128 #define MAXFUNIX       20
129
130 int nfunix = 1;
131 const char *funixn[MAXFUNIX] = { _PATH_LOG };
132 int funix[MAXFUNIX];
133
134 /*
135  * Flags to logmsg().
136  */
137
138 #define IGN_CONS        0x001   /* don't print on console */
139 #define SYNC_FILE       0x002   /* do fsync on file after printing */
140 #define ADDDATE         0x004   /* add a date to the message */
141 #define MARK            0x008   /* this message is a mark */
142 #define ISKERNEL        0x010   /* kernel generated message */
143
144 /*
145  * This structure represents the files that will have log
146  * copies printed.
147  * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
148  * or if f_type if F_PIPE and f_pid > 0.
149  */
150
151 struct filed {
152         struct  filed *f_next;          /* next in linked list */
153         short   f_type;                 /* entry type, see below */
154         short   f_file;                 /* file descriptor */
155         time_t  f_time;                 /* time this was last written */
156         char    *f_host;                /* host from which to recd. */
157         u_char  f_pmask[LOG_NFACILITIES+1];     /* priority mask */
158         u_char  f_pcmp[LOG_NFACILITIES+1];      /* compare priority */
159 #define PRI_LT  0x1
160 #define PRI_EQ  0x2
161 #define PRI_GT  0x4
162         char    *f_program;             /* program this applies to */
163         union {
164                 char    f_uname[MAXUNAMES][UT_NAMESIZE+1];
165                 struct {
166                         char    f_hname[MAXHOSTNAMELEN];
167                         struct addrinfo *f_addr;
168
169                 } f_forw;               /* forwarding address */
170                 char    f_fname[MAXPATHLEN];
171                 struct {
172                         char    f_pname[MAXPATHLEN];
173                         pid_t   f_pid;
174                 } f_pipe;
175                 struct {
176                         char    f_rname[MAXPATHLEN];
177                         struct clog_footer *f_footer;
178                         size_t  f_size;
179                 } f_ring;
180         } f_un;
181         char    f_prevline[MAXSVLINE];          /* last message logged */
182         char    f_lasttime[16];                 /* time of last occurrence */
183         char    f_prevhost[MAXHOSTNAMELEN];     /* host from which recd. */
184         int     f_prevpri;                      /* pri of f_prevline */
185         int     f_prevlen;                      /* length of f_prevline */
186         int     f_prevcount;                    /* repetition cnt of prevline */
187         u_int   f_repeatcount;                  /* number of "repeated" msgs */
188         int     f_flags;                        /* file-specific flags */
189 #define FFLAG_SYNC 0x01
190 #define FFLAG_NEEDSYNC  0x02
191 };
192
193 /*
194  * Queue of about-to-be dead processes we should watch out for.
195  */
196
197 TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
198 struct stailhead *deadq_headp;
199
200 struct deadq_entry {
201         pid_t                           dq_pid;
202         int                             dq_timeout;
203         TAILQ_ENTRY(deadq_entry)        dq_entries;
204 };
205
206 /*
207  * The timeout to apply to processes waiting on the dead queue.  Unit
208  * of measure is `mark intervals', i.e. 20 minutes by default.
209  * Processes on the dead queue will be terminated after that time.
210  */
211
212 #define DQ_TIMO_INIT    2
213
214 typedef struct deadq_entry *dq_t;
215
216
217 /*
218  * Struct to hold records of network addresses that are allowed to log
219  * to us.
220  */
221 struct allowedpeer {
222         int isnumeric;
223         u_short port;
224         union {
225                 struct {
226                         struct sockaddr_storage addr;
227                         struct sockaddr_storage mask;
228                 } numeric;
229                 char *name;
230         } u;
231 #define a_addr u.numeric.addr
232 #define a_mask u.numeric.mask
233 #define a_name u.name
234 };
235
236
237 /*
238  * Intervals at which we flush out "message repeated" messages,
239  * in seconds after previous message is logged.  After each flush,
240  * we move to the next interval until we reach the largest.
241  */
242 int     repeatinterval[] = { 30, 120, 600 };    /* # of secs before flush */
243 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
244 #define REPEATTIME(f)   ((f)->f_time + repeatinterval[(f)->f_repeatcount])
245 #define BACKOFF(f)      { if (++(f)->f_repeatcount > MAXREPEAT) \
246                                  (f)->f_repeatcount = MAXREPEAT; \
247                         }
248
249 /* values for f_type */
250 #define F_UNUSED        0               /* unused entry */
251 #define F_FILE          1               /* regular file */
252 #define F_TTY           2               /* terminal */
253 #define F_CONSOLE       3               /* console terminal */
254 #define F_FORW          4               /* remote machine */
255 #define F_USERS         5               /* list of users */
256 #define F_WALL          6               /* everyone logged on */
257 #define F_PIPE          7               /* pipe to program */
258 #define F_RING          8               /* ring buffer (circular log) */
259
260 const char *TypeNames[] = {
261         "UNUSED",       "FILE",         "TTY",          "CONSOLE",
262         "FORW",         "USERS",        "WALL",         "PIPE",
263         "RING"
264 };
265
266 static struct filed *Files;     /* Log files that we write to */
267 static struct filed consfile;   /* Console */
268
269 static int      Debug;          /* debug flag */
270 static int      resolve = 1;    /* resolve hostname */
271 static char     LocalHostName[MAXHOSTNAMELEN];  /* our hostname */
272 static const char *LocalDomain; /* our local domain name */
273 static int      *finet;         /* Internet datagram socket */
274 static int      fklog = -1;     /* /dev/klog */
275 static int      Initialized;    /* set when we have initialized ourselves */
276 static int      MarkInterval = 20 * 60; /* interval between marks in seconds */
277 static int      MarkSeq;        /* mark sequence number */
278 static int      SecureMode;     /* when true, receive only unix domain socks */
279 #ifdef INET6
280 static int      family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
281 #else
282 static int      family = PF_INET; /* protocol family (IPv4 only) */
283 #endif
284 static int      send_to_all;    /* send message to all IPv4/IPv6 addresses */
285 static int      use_bootfile;   /* log entire bootfile for every kern msg */
286 static int      no_compress;    /* don't compress messages (1=pipes, 2=all) */
287
288 static char     bootfile[MAXLINE+1]; /* booted kernel file */
289
290 struct allowedpeer *AllowedPeers; /* List of allowed peers */
291 static int      NumAllowed;     /* Number of entries in AllowedPeers */
292
293 static int      UniquePriority; /* Only log specified priority? */
294 static int      LogFacPri;      /* Put facility and priority in log message: */
295                                 /* 0=no, 1=numeric, 2=names */
296 static int      KeepKernFac;    /* Keep remotely logged kernel facility */
297 static int      needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
298
299 volatile sig_atomic_t MarkSet, WantDie;
300
301 static int      allowaddr(char *);
302 static void     cfline(const char *, struct filed *,
303                     const char *, const char *);
304 static const char *cvthname(struct sockaddr *);
305 static void     deadq_enter(pid_t, const char *);
306 static int      deadq_remove(pid_t);
307 static int      decode(const char *, CODE *);
308 static void     die(int);
309 static void     dodie(int);
310 static void     dofsync(void);
311 static void     domark(int);
312 static void     fprintlog(struct filed *, int, const char *);
313 static int      *socksetup(int, const char *);
314 static void     init(int);
315 static void     logerror(const char *);
316 static void     logmsg(int, const char *, const char *, int);
317 static void     log_deadchild(pid_t, int, const char *);
318 static void     markit(void);
319 static int      skip_message(const char *, const char *, int);
320 static void     printline(const char *, char *);
321 static void     printsys(char *);
322 static int      p_open(const char *, pid_t *);
323 ssize_t         rbwrite(struct filed *, char *, size_t);
324 ssize_t         rbwritev(struct filed *, struct iovec *, int);
325 static void     readklog(void);
326 static void     reapchild(int);
327 static void     usage(void);
328 static int      validate(struct sockaddr *, const char *);
329 static void     unmapped(struct sockaddr *);
330 static void     wallmsg(struct filed *, struct iovec *);
331 static int      waitdaemon(int, int, int);
332 static void     timedout(int);
333
334 int
335 main(int argc, char *argv[])
336 {
337         int ch, i, fdsrmax = 0, l;
338         struct sockaddr_un sunx, fromunix;
339         struct sockaddr_storage frominet;
340         fd_set *fdsr = NULL;
341         FILE *fp;
342         char line[MAXLINE + 1];
343         const char *bindhostname, *hname;
344         struct timeval tv, *tvp;
345         struct sigaction sact;
346         sigset_t mask;
347         pid_t ppid = 1;
348         socklen_t len;
349
350         bindhostname = NULL;
351         while ((ch = getopt(argc, argv, "46Aa:b:cdf:kl:m:nop:P:suv")) != -1)
352                 switch (ch) {
353                 case '4':
354                         family = PF_INET;
355                         break;
356 #ifdef INET6
357                 case '6':
358                         family = PF_INET6;
359                         break;
360 #endif
361                 case 'A':
362                         send_to_all++;
363                         break;
364                 case 'a':               /* allow specific network addresses only */
365                         if (allowaddr(optarg) == -1)
366                                 usage();
367                         break;
368                 case 'b':
369                         bindhostname = optarg;
370                         break;
371                 case 'c':
372                         no_compress++;
373                         break;
374                 case 'd':               /* debug */
375                         Debug++;
376                         break;
377                 case 'f':               /* configuration file */
378                         ConfFile = optarg;
379                         break;
380                 case 'k':               /* keep remote kern fac */
381                         KeepKernFac = 1;
382                         break;
383                 case 'l':
384                         if (strlen(optarg) >= sizeof(sunx.sun_path))
385                                 errx(1, "%s path too long, exiting", optarg);
386                         if (nfunix < MAXFUNIX)
387                                 funixn[nfunix++] = optarg;
388                         else
389                                 warnx("out of descriptors, ignoring %s",
390                                         optarg);
391                         break;
392                 case 'm':               /* mark interval */
393                         MarkInterval = atoi(optarg) * 60;
394                         break;
395                 case 'n':
396                         resolve = 0;
397                         break;
398                 case 'o':
399                         use_bootfile = 1;
400                         break;
401                 case 'p':               /* path */
402                         if (strlen(optarg) >= sizeof(sunx.sun_path))
403                                 errx(1, "%s path too long, exiting", optarg);
404                         funixn[0] = optarg;
405                         break;
406                 case 'P':               /* path for alt. PID */
407                         PidFile = optarg;
408                         break;
409                 case 's':               /* no network mode */
410                         SecureMode++;
411                         break;
412                 case 'u':               /* only log specified priority */
413                         UniquePriority++;
414                         break;
415                 case 'v':               /* log facility and priority */
416                         LogFacPri++;
417                         break;
418                 default:
419                         usage();
420                 }
421         if ((argc -= optind) != 0)
422                 usage();
423
424         if (!Debug) {
425                 ppid = waitdaemon(0, 0, 30);
426                 if (ppid < 0)
427                         err(1, "could not become daemon");
428         } else {
429                 setlinebuf(stdout);
430         }
431
432         if (NumAllowed)
433                 endservent();
434
435         consfile.f_type = F_CONSOLE;
436         (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
437             sizeof(consfile.f_un.f_fname));
438         (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
439         (void)signal(SIGTERM, dodie);
440         (void)signal(SIGINT, Debug ? dodie : SIG_IGN);
441         (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
442         /*
443          * We don't want the SIGCHLD and SIGHUP handlers to interfere
444          * with each other; they are likely candidates for being called
445          * simultaneously (SIGHUP closes pipe descriptor, process dies,
446          * SIGCHLD happens).
447          */
448         sigemptyset(&mask);
449         sigaddset(&mask, SIGHUP);
450         sact.sa_handler = reapchild;
451         sact.sa_mask = mask;
452         sact.sa_flags = SA_RESTART;
453         (void)sigaction(SIGCHLD, &sact, NULL);
454         (void)signal(SIGALRM, domark);
455         (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */
456         (void)alarm(TIMERINTVL);
457
458         TAILQ_INIT(&deadq_head);
459
460 #ifndef SUN_LEN
461 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
462 #endif
463         for (i = 0; i < nfunix; i++) {
464                 (void)unlink(funixn[i]);
465                 memset(&sunx, 0, sizeof(sunx));
466                 sunx.sun_family = AF_UNIX;
467                 (void)strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path));
468                 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0);
469                 if (funix[i] < 0 ||
470                     bind(funix[i], (struct sockaddr *)&sunx,
471                          SUN_LEN(&sunx)) < 0 ||
472                     chmod(funixn[i], 0666) < 0) {
473                         (void)snprintf(line, sizeof line,
474                                         "cannot create %s", funixn[i]);
475                         logerror(line);
476                         dprintf("cannot create %s (%d)\n", funixn[i], errno);
477                         if (i == 0)
478                                 die(0);
479                 }
480         }
481         if (SecureMode <= 1)
482                 finet = socksetup(family, bindhostname);
483
484         if (finet) {
485                 if (SecureMode) {
486                         for (i = 0; i < *finet; i++) {
487                                 if (shutdown(finet[i+1], SHUT_RD) < 0) {
488                                         logerror("shutdown");
489                                         if (!Debug)
490                                                 die(0);
491                                 }
492                         }
493                 } else {
494                         dprintf("listening on inet and/or inet6 socket\n");
495                 }
496                 dprintf("sending on inet and/or inet6 socket\n");
497         }
498
499         if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
500                 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
501                         fklog = -1;
502         if (fklog < 0)
503                 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
504
505         /* tuck my process id away */
506         fp = fopen(PidFile, "w");
507         if (fp != NULL) {
508                 fprintf(fp, "%d\n", getpid());
509                 (void)fclose(fp);
510         }
511
512         dprintf("off & running....\n");
513
514         init(0);
515         /* prevent SIGHUP and SIGCHLD handlers from running in parallel */
516         sigemptyset(&mask);
517         sigaddset(&mask, SIGCHLD);
518         sact.sa_handler = init;
519         sact.sa_mask = mask;
520         sact.sa_flags = SA_RESTART;
521         (void)sigaction(SIGHUP, &sact, NULL);
522
523         tvp = &tv;
524         tv.tv_sec = tv.tv_usec = 0;
525
526         if (fklog != -1 && fklog > fdsrmax)
527                 fdsrmax = fklog;
528         if (finet && !SecureMode) {
529                 for (i = 0; i < *finet; i++) {
530                     if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
531                         fdsrmax = finet[i+1];
532                 }
533         }
534         for (i = 0; i < nfunix; i++) {
535                 if (funix[i] != -1 && funix[i] > fdsrmax)
536                         fdsrmax = funix[i];
537         }
538
539         fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
540             sizeof(fd_mask));
541         if (fdsr == NULL)
542                 errx(1, "calloc fd_set");
543
544         for (;;) {
545                 if (MarkSet)
546                         markit();
547                 if (WantDie)
548                         die(WantDie);
549
550                 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
551                     sizeof(fd_mask));
552
553                 if (fklog != -1)
554                         FD_SET(fklog, fdsr);
555                 if (finet && !SecureMode) {
556                         for (i = 0; i < *finet; i++) {
557                                 if (finet[i+1] != -1)
558                                         FD_SET(finet[i+1], fdsr);
559                         }
560                 }
561                 for (i = 0; i < nfunix; i++) {
562                         if (funix[i] != -1)
563                                 FD_SET(funix[i], fdsr);
564                 }
565
566                 i = select(fdsrmax+1, fdsr, NULL, NULL,
567                     needdofsync ? &tv : tvp);
568                 switch (i) {
569                 case 0:
570                         dofsync();
571                         needdofsync = 0;
572                         if (tvp) {
573                                 tvp = NULL;
574                                 if (ppid != 1)
575                                         kill(ppid, SIGALRM);
576                         }
577                         continue;
578                 case -1:
579                         if (errno != EINTR)
580                                 logerror("select");
581                         continue;
582                 }
583                 if (fklog != -1 && FD_ISSET(fklog, fdsr))
584                         readklog();
585                 if (finet && !SecureMode) {
586                         for (i = 0; i < *finet; i++) {
587                                 if (FD_ISSET(finet[i+1], fdsr)) {
588                                         len = sizeof(frominet);
589                                         l = recvfrom(finet[i+1], line, MAXLINE,
590                                              0, (struct sockaddr *)&frominet,
591                                              &len);
592                                         if (l > 0) {
593                                                 line[l] = '\0';
594                                                 hname = cvthname((struct sockaddr *)&frominet);
595                                                 unmapped((struct sockaddr *)&frominet);
596                                                 if (validate((struct sockaddr *)&frominet, hname))
597                                                         printline(hname, line);
598                                         } else if (l < 0 && errno != EINTR)
599                                                 logerror("recvfrom inet");
600                                 }
601                         }
602                 }
603                 for (i = 0; i < nfunix; i++) {
604                         if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) {
605                                 len = sizeof(fromunix);
606                                 l = recvfrom(funix[i], line, MAXLINE, 0,
607                                     (struct sockaddr *)&fromunix, &len);
608                                 if (l > 0) {
609                                         line[l] = '\0';
610                                         printline(LocalHostName, line);
611                                 } else if (l < 0 && errno != EINTR)
612                                         logerror("recvfrom unix");
613                         }
614                 }
615         }
616         if (fdsr)
617                 free(fdsr);
618 }
619
620 static void
621 unmapped(struct sockaddr *sa)
622 {
623         struct sockaddr_in6 *sin6;
624         struct sockaddr_in sin4;
625
626         if (sa->sa_family != AF_INET6)
627                 return;
628         if (sa->sa_len != sizeof(struct sockaddr_in6) ||
629             sizeof(sin4) > sa->sa_len)
630                 return;
631         sin6 = (struct sockaddr_in6 *)sa;
632         if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
633                 return;
634
635         memset(&sin4, 0, sizeof(sin4));
636         sin4.sin_family = AF_INET;
637         sin4.sin_len = sizeof(struct sockaddr_in);
638         memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
639                sizeof(sin4.sin_addr));
640         sin4.sin_port = sin6->sin6_port;
641
642         memcpy(sa, &sin4, sin4.sin_len);
643 }
644
645 static void
646 usage(void)
647 {
648
649         fprintf(stderr, "%s\n%s\n%s\n%s\n",
650                 "usage: syslogd [-46Acdknosuv] [-a allowed_peer]",
651                 "               [-b bind address] [-f config_file]",
652                 "               [-l log_socket] [-m mark_interval]",
653                 "               [-P pid_file] [-p log_socket]");
654         exit(1);
655 }
656
657 /*
658  * Take a raw input line, decode the message, and print the message
659  * on the appropriate log files.
660  */
661 static void
662 printline(const char *hname, char *msg)
663 {
664         char *p, *q;
665         long n;
666         int c, pri;
667         char line[MAXLINE + 1];
668
669         /* test for special codes */
670         p = msg;
671         pri = DEFUPRI;
672         if (*p == '<') {
673                 errno = 0;
674                 n = strtol(p + 1, &q, 10);
675                 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
676                         p = q + 1;
677                         pri = n;
678                 }
679         }
680         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
681                 pri = DEFUPRI;
682
683         /*
684          * Don't allow users to log kernel messages.
685          * NOTE: since LOG_KERN == 0 this will also match
686          *       messages with no facility specified.
687          */
688         if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
689                 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
690
691         q = line;
692
693         while ((c = (unsigned char)*p++) != '\0' &&
694             q < &line[sizeof(line) - 4]) {
695                 if ((c & 0x80) && c < 0xA0) {
696                         c &= 0x7F;
697                         *q++ = 'M';
698                         *q++ = '-';
699                 }
700                 if (isascii(c) && iscntrl(c)) {
701                         if (c == '\n') {
702                                 *q++ = ' ';
703                         } else if (c == '\t') {
704                                 *q++ = '\t';
705                         } else {
706                                 *q++ = '^';
707                                 *q++ = c ^ 0100;
708                         }
709                 } else {
710                         *q++ = c;
711                 }
712         }
713         *q = '\0';
714
715         logmsg(pri, line, hname, 0);
716 }
717
718 /*
719  * Read /dev/klog while data are available, split into lines.
720  */
721 static void
722 readklog(void)
723 {
724         char *p, *q, line[MAXLINE + 1];
725         int len, i;
726
727         len = 0;
728         for (;;) {
729                 i = read(fklog, line + len, MAXLINE - 1 - len);
730                 if (i > 0) {
731                         line[i + len] = '\0';
732                 } else {
733                         if (i < 0 && errno != EINTR && errno != EAGAIN) {
734                                 logerror("klog");
735                                 fklog = -1;
736                         }
737                         break;
738                 }
739
740                 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
741                         *q = '\0';
742                         printsys(p);
743                 }
744                 len = strlen(p);
745                 if (len >= MAXLINE - 1) {
746                         printsys(p);
747                         len = 0;
748                 }
749                 if (len > 0) 
750                         memmove(line, p, len + 1);
751         }
752         if (len > 0)
753                 printsys(line);
754 }
755
756 /*
757  * Take a raw input line from /dev/klog, format similar to syslog().
758  */
759 static void
760 printsys(char *msg)
761 {
762         char *p, *q;
763         long n;
764         int flags, isprintf, pri;
765
766         flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */
767         p = msg;
768         pri = DEFSPRI;
769         isprintf = 1;
770         if (*p == '<') {
771                 errno = 0;
772                 n = strtol(p + 1, &q, 10);
773                 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
774                         p = q + 1;
775                         pri = n;
776                         isprintf = 0;
777                 }
778         }
779         /*
780          * Kernel printf's and LOG_CONSOLE messages have been displayed
781          * on the console already.
782          */
783         if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
784                 flags |= IGN_CONS;
785         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
786                 pri = DEFSPRI;
787         logmsg(pri, p, LocalHostName, flags);
788 }
789
790 static time_t   now;
791
792 /*
793  * Match a program or host name against a specification.
794  * Return a non-0 value if the message must be ignored
795  * based on the specification.
796  */
797 static int
798 skip_message(const char *name, const char *spec, int checkcase) {
799         const char *s;
800         char prev, next;
801         int exclude = 0;
802         /* Behaviour on explicit match */
803
804         if (spec == NULL)
805                 return 0;
806         switch (*spec) {
807         case '-':
808                 exclude = 1;
809                 /*FALLTHROUGH*/
810         case '+':
811                 spec++;
812                 break;
813         default:
814                 break;
815         }
816         if (checkcase)
817                 s = strstr (spec, name);
818         else
819                 s = strcasestr (spec, name);
820
821         if (s != NULL) {
822                 prev = (s == spec ? ',' : *(s - 1));
823                 next = *(s + strlen (name));
824
825                 if (prev == ',' && (next == '\0' || next == ','))
826                         /* Explicit match: skip iff the spec is an
827                            exclusive one. */
828                         return exclude;
829         }
830
831         /* No explicit match for this name: skip the message iff
832            the spec is an inclusive one. */
833         return !exclude;
834 }
835
836 /*
837  * Log a message to the appropriate log files, users, etc. based on
838  * the priority.
839  */
840 static void
841 logmsg(int pri, const char *msg, const char *from, int flags)
842 {
843         struct filed *f;
844         int i, fac, msglen, omask, prilev;
845         const char *timestamp;
846         char prog[NAME_MAX+1];
847         char buf[MAXLINE+1];
848
849         dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
850             pri, flags, from, msg);
851
852         omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
853
854         /*
855          * Check to see if msg looks non-standard.
856          */
857         msglen = strlen(msg);
858         if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
859             msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
860                 flags |= ADDDATE;
861
862         (void)time(&now);
863         if (flags & ADDDATE) {
864                 timestamp = ctime(&now) + 4;
865         } else {
866                 timestamp = msg;
867                 msg += 16;
868                 msglen -= 16;
869         }
870
871         /* skip leading blanks */
872         while (isspace(*msg)) {
873                 msg++;
874                 msglen--;
875         }
876
877         /* extract facility and priority level */
878         if (flags & MARK)
879                 fac = LOG_NFACILITIES;
880         else
881                 fac = LOG_FAC(pri);
882         prilev = LOG_PRI(pri);
883
884         /* extract program name */
885         for (i = 0; i < NAME_MAX; i++) {
886                 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
887                     msg[i] == '/')
888                         break;
889                 prog[i] = msg[i];
890         }
891         prog[i] = 0;
892
893         /* add kernel prefix for kernel messages */
894         if (flags & ISKERNEL) {
895                 snprintf(buf, sizeof(buf), "%s: %s",
896                     use_bootfile ? bootfile : "kernel", msg);
897                 msg = buf;
898                 msglen = strlen(buf);
899         }
900
901         /* log the message to the particular outputs */
902         if (!Initialized) {
903                 f = &consfile;
904                 f->f_file = open(ctty, O_WRONLY, 0);
905
906                 if (f->f_file >= 0) {
907                         (void)strlcpy(f->f_lasttime, timestamp,
908                                 sizeof(f->f_lasttime));
909                         fprintlog(f, flags, msg);
910                         (void)close(f->f_file);
911                 }
912                 (void)sigsetmask(omask);
913                 return;
914         }
915         for (f = Files; f; f = f->f_next) {
916                 /* skip messages that are incorrect priority */
917                 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
918                      ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
919                      ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
920                      )
921                     || f->f_pmask[fac] == INTERNAL_NOPRI)
922                         continue;
923
924                 /* skip messages with the incorrect hostname */
925                 if (skip_message(from, f->f_host, 0))
926                         continue;
927
928                 /* skip messages with the incorrect program name */
929                 if (skip_message(prog, f->f_program, 1))
930                         continue;
931
932                 /* skip message to console if it has already been printed */
933                 if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
934                         continue;
935
936                 /* don't output marks to recently written files */
937                 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
938                         continue;
939
940                 /*
941                  * suppress duplicate lines to this file
942                  */
943                 if (no_compress - (f->f_type != F_PIPE) < 1 &&
944                     (flags & MARK) == 0 && msglen == f->f_prevlen &&
945                     !strcmp(msg, f->f_prevline) &&
946                     !strcasecmp(from, f->f_prevhost)) {
947                         (void)strlcpy(f->f_lasttime, timestamp,
948                                 sizeof(f->f_lasttime));
949                         f->f_prevcount++;
950                         dprintf("msg repeated %d times, %ld sec of %d\n",
951                             f->f_prevcount, (long)(now - f->f_time),
952                             repeatinterval[f->f_repeatcount]);
953                         /*
954                          * If domark would have logged this by now,
955                          * flush it now (so we don't hold isolated messages),
956                          * but back off so we'll flush less often
957                          * in the future.
958                          */
959                         if (now > REPEATTIME(f)) {
960                                 fprintlog(f, flags, (char *)NULL);
961                                 BACKOFF(f);
962                         }
963                 } else {
964                         /* new line, save it */
965                         if (f->f_prevcount)
966                                 fprintlog(f, 0, (char *)NULL);
967                         f->f_repeatcount = 0;
968                         f->f_prevpri = pri;
969                         (void)strlcpy(f->f_lasttime, timestamp,
970                                 sizeof(f->f_lasttime));
971                         (void)strlcpy(f->f_prevhost, from,
972                             sizeof(f->f_prevhost));
973                         if (msglen < MAXSVLINE) {
974                                 f->f_prevlen = msglen;
975                                 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
976                                 fprintlog(f, flags, (char *)NULL);
977                         } else {
978                                 f->f_prevline[0] = 0;
979                                 f->f_prevlen = 0;
980                                 fprintlog(f, flags, msg);
981                         }
982                 }
983         }
984         (void)sigsetmask(omask);
985 }
986
987 static void
988 dofsync(void)
989 {
990         struct filed *f;
991
992         for (f = Files; f; f = f->f_next) {
993                 if ((f->f_type == F_FILE) &&
994                     (f->f_flags & FFLAG_NEEDSYNC)) {
995                         f->f_flags &= ~FFLAG_NEEDSYNC;
996                         (void)fsync(f->f_file);
997                 }
998         }
999 }
1000
1001 static void
1002 fprintlog(struct filed *f, int flags, const char *msg)
1003 {
1004         struct iovec iov[7];
1005         struct iovec *v;
1006         struct addrinfo *r;
1007         int i, l, lsent = 0;
1008         char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
1009         char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
1010         const char *msgret;
1011
1012         v = iov;
1013         if (f->f_type == F_WALL) {
1014                 v->iov_base = greetings;
1015                 v->iov_len = snprintf(greetings, sizeof greetings,
1016                     "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
1017                     f->f_prevhost, ctime(&now));
1018                 if (v->iov_len > 0)
1019                         v++;
1020                 v->iov_base = nul;
1021                 v->iov_len = 0;
1022                 v++;
1023         } else {
1024                 v->iov_base = f->f_lasttime;
1025                 v->iov_len = 15;
1026                 v++;
1027                 v->iov_base = space;
1028                 v->iov_len = 1;
1029                 v++;
1030         }
1031
1032         if (LogFacPri) {
1033                 static char fp_buf[30]; /* Hollow laugh */
1034                 int fac = f->f_prevpri & LOG_FACMASK;
1035                 int pri = LOG_PRI(f->f_prevpri);
1036                 const char *f_s = NULL;
1037                 char f_n[5];    /* Hollow laugh */
1038                 const char *p_s = NULL;
1039                 char p_n[5];    /* Hollow laugh */
1040
1041                 if (LogFacPri > 1) {
1042                   CODE *c;
1043
1044                   for (c = facilitynames; c->c_name; c++) {
1045                     if (c->c_val == fac) {
1046                       f_s = c->c_name;
1047                       break;
1048                     }
1049                   }
1050                   for (c = prioritynames; c->c_name; c++) {
1051                     if (c->c_val == pri) {
1052                       p_s = c->c_name;
1053                       break;
1054                     }
1055                   }
1056                 }
1057                 if (!f_s) {
1058                   snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1059                   f_s = f_n;
1060                 }
1061                 if (!p_s) {
1062                   snprintf(p_n, sizeof p_n, "%d", pri);
1063                   p_s = p_n;
1064                 }
1065                 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
1066                 v->iov_base = fp_buf;
1067                 v->iov_len = strlen(fp_buf);
1068         } else {
1069                 v->iov_base = nul;
1070                 v->iov_len = 0;
1071         }
1072         v++;
1073
1074         v->iov_base = f->f_prevhost;
1075         v->iov_len = strlen(v->iov_base);
1076         v++;
1077         v->iov_base = space;
1078         v->iov_len = 1;
1079         v++;
1080
1081         if (msg) {
1082                 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1083                 if (wmsg == NULL) {
1084                         logerror("strdup");
1085                         exit(1);
1086                 }
1087                 v->iov_base = wmsg;
1088                 v->iov_len = strlen(msg);
1089         } else if (f->f_prevcount > 1) {
1090                 v->iov_base = repbuf;
1091                 v->iov_len = snprintf(repbuf, sizeof repbuf,
1092                     "last message repeated %d times", f->f_prevcount);
1093         } else {
1094                 v->iov_base = f->f_prevline;
1095                 v->iov_len = f->f_prevlen;
1096         }
1097         v++;
1098
1099         dprintf("Logging to %s", TypeNames[f->f_type]);
1100         f->f_time = now;
1101
1102         switch (f->f_type) {
1103         case F_UNUSED:
1104                 dprintf("\n");
1105                 break;
1106
1107         case F_FORW:
1108                 dprintf(" %s\n", f->f_un.f_forw.f_hname);
1109                 /* check for local vs remote messages */
1110                 if (strcasecmp(f->f_prevhost, LocalHostName))
1111                         l = snprintf(line, sizeof line - 1,
1112                             "<%d>%.15s Forwarded from %s: %s",
1113                             f->f_prevpri, (char *)iov[0].iov_base,
1114                             f->f_prevhost, (char *)iov[5].iov_base);
1115                 else
1116                         l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1117                              f->f_prevpri, (char *)iov[0].iov_base,
1118                             (char *)iov[5].iov_base);
1119                 if (l < 0)
1120                         l = 0;
1121                 else if (l > MAXLINE)
1122                         l = MAXLINE;
1123
1124                 if (finet) {
1125                         for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1126                                 for (i = 0; i < *finet; i++) {
1127 #if 0 
1128                                         /*
1129                                          * should we check AF first, or just
1130                                          * trial and error? FWD
1131                                          */
1132                                         if (r->ai_family ==
1133                                             address_family_of(finet[i+1])) 
1134 #endif
1135                                         lsent = sendto(finet[i+1], line, l, 0,
1136                                             r->ai_addr, r->ai_addrlen);
1137                                         if (lsent == l) 
1138                                                 break;
1139                                 }
1140                                 if (lsent == l && !send_to_all) 
1141                                         break;
1142                         }
1143                         dprintf("lsent/l: %d/%d\n", lsent, l);
1144                         if (lsent != l) {
1145                                 int e = errno;
1146                                 logerror("sendto");
1147                                 errno = e;
1148                                 switch (errno) {
1149                                 case EHOSTUNREACH:
1150                                 case EHOSTDOWN:
1151                                         break;
1152                                 /* case EBADF: */
1153                                 /* case EACCES: */
1154                                 /* case ENOTSOCK: */
1155                                 /* case EFAULT: */
1156                                 /* case EMSGSIZE: */
1157                                 /* case EAGAIN: */
1158                                 /* case ENOBUFS: */
1159                                 /* case ECONNREFUSED: */
1160                                 default:
1161                                         dprintf("removing entry\n");
1162                                         f->f_type = F_UNUSED;
1163                                         break;
1164                                 }
1165                         }
1166                 }
1167                 break;
1168
1169         case F_FILE:
1170                 dprintf(" %s\n", f->f_un.f_fname);
1171                 v->iov_base = lf;
1172                 v->iov_len = 1;
1173                 if (writev(f->f_file, iov, 7) < 0) {
1174                         int e = errno;
1175                         (void)close(f->f_file);
1176                         f->f_type = F_UNUSED;
1177                         errno = e;
1178                         logerror(f->f_un.f_fname);
1179                 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1180                         f->f_flags |= FFLAG_NEEDSYNC;
1181                         needdofsync = 1;
1182                 }
1183                 break;
1184
1185         case F_RING:
1186                 dprintf(" %s\n", f->f_un.f_ring.f_rname);
1187                 v->iov_base = "\n";
1188                 v->iov_len = 1;
1189                 if (rbwritev(f, iov, 7) == -1) {
1190                         int e = errno;
1191                         munmap(f->f_un.f_ring.f_footer,
1192                                 sizeof(struct clog_footer));
1193                         close(f->f_file);
1194                         f->f_type = F_UNUSED;
1195                         errno = e;
1196                         logerror(f->f_un.f_fname);
1197                 }
1198                 break;
1199
1200         case F_PIPE:
1201                 dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1202                 v->iov_base = lf;
1203                 v->iov_len = 1;
1204                 if (f->f_un.f_pipe.f_pid == 0) {
1205                         if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1206                                                 &f->f_un.f_pipe.f_pid)) < 0) {
1207                                 f->f_type = F_UNUSED;
1208                                 logerror(f->f_un.f_pipe.f_pname);
1209                                 break;
1210                         }
1211                 }
1212                 if (writev(f->f_file, iov, 7) < 0) {
1213                         int e = errno;
1214                         (void)close(f->f_file);
1215                         if (f->f_un.f_pipe.f_pid > 0)
1216                                 deadq_enter(f->f_un.f_pipe.f_pid,
1217                                             f->f_un.f_pipe.f_pname);
1218                         f->f_un.f_pipe.f_pid = 0;
1219                         errno = e;
1220                         logerror(f->f_un.f_pipe.f_pname);
1221                 }
1222                 break;
1223
1224         case F_CONSOLE:
1225                 if (flags & IGN_CONS) {
1226                         dprintf(" (ignored)\n");
1227                         break;
1228                 }
1229                 /* FALLTHROUGH */
1230
1231         case F_TTY:
1232                 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1233                 v->iov_base = crlf;
1234                 v->iov_len = 2;
1235
1236                 errno = 0;      /* ttymsg() only sometimes returns an errno */
1237                 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) {
1238                         f->f_type = F_UNUSED;
1239                         logerror(msgret);
1240                 }
1241                 break;
1242
1243         case F_USERS:
1244         case F_WALL:
1245                 dprintf("\n");
1246                 v->iov_base = crlf;
1247                 v->iov_len = 2;
1248                 wallmsg(f, iov);
1249                 break;
1250         }
1251         f->f_prevcount = 0;
1252         if (msg)
1253                 free(wmsg);
1254 }
1255
1256 /*
1257  *  WALLMSG -- Write a message to the world at large
1258  *
1259  *      Write the specified message to either the entire
1260  *      world, or a list of approved users.
1261  */
1262 static void
1263 wallmsg(struct filed *f, struct iovec *iov)
1264 {
1265         static int reenter;                     /* avoid calling ourselves */
1266         FILE *uf;
1267         struct utmp ut;
1268         int i;
1269         const char *p;
1270         char line[sizeof(ut.ut_line) + 1];
1271
1272         if (reenter++)
1273                 return;
1274         if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1275                 logerror(_PATH_UTMP);
1276                 reenter = 0;
1277                 return;
1278         }
1279         /* NOSTRICT */
1280         while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1281                 if (ut.ut_name[0] == '\0')
1282                         continue;
1283                 /* We must use strncpy since ut_* may not be NUL terminated. */
1284                 strncpy(line, ut.ut_line, sizeof(line) - 1);
1285                 line[sizeof(line) - 1] = '\0';
1286                 if (f->f_type == F_WALL) {
1287                         if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) {
1288                                 errno = 0;      /* already in msg */
1289                                 logerror(p);
1290                         }
1291                         continue;
1292                 }
1293                 /* should we send the message to this user? */
1294                 for (i = 0; i < MAXUNAMES; i++) {
1295                         if (!f->f_un.f_uname[i][0])
1296                                 break;
1297                         if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1298                             UT_NAMESIZE)) {
1299                                 if ((p = ttymsg(iov, 7, line, TTYMSGTIME))
1300                                                                 != NULL) {
1301                                         errno = 0;      /* already in msg */
1302                                         logerror(p);
1303                                 }
1304                                 break;
1305                         }
1306                 }
1307         }
1308         (void)fclose(uf);
1309         reenter = 0;
1310 }
1311
1312 static void
1313 reapchild(int signo __unused)
1314 {
1315         int status;
1316         pid_t pid;
1317         struct filed *f;
1318
1319         while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1320                 if (!Initialized)
1321                         /* Don't tell while we are initting. */
1322                         continue;
1323
1324                 /* First, look if it's a process from the dead queue. */
1325                 if (deadq_remove(pid))
1326                         goto oncemore;
1327
1328                 /* Now, look in list of active processes. */
1329                 for (f = Files; f; f = f->f_next)
1330                         if (f->f_type == F_PIPE &&
1331                             f->f_un.f_pipe.f_pid == pid) {
1332                                 (void)close(f->f_file);
1333                                 f->f_un.f_pipe.f_pid = 0;
1334                                 log_deadchild(pid, status,
1335                                               f->f_un.f_pipe.f_pname);
1336                                 break;
1337                         }
1338           oncemore:
1339                 continue;
1340         }
1341 }
1342
1343 /*
1344  * Return a printable representation of a host address.
1345  */
1346 static const char *
1347 cvthname(struct sockaddr *f)
1348 {
1349         int error, hl;
1350         sigset_t omask, nmask;
1351         static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1352
1353         error = getnameinfo((struct sockaddr *)f,
1354                             ((struct sockaddr *)f)->sa_len,
1355                             ip, sizeof ip, NULL, 0,
1356                             NI_NUMERICHOST | withscopeid);
1357         dprintf("cvthname(%s)\n", ip);
1358
1359         if (error) {
1360                 dprintf("Malformed from address %s\n", gai_strerror(error));
1361                 return ("???");
1362         }
1363         if (!resolve)
1364                 return (ip);
1365
1366         sigemptyset(&nmask);
1367         sigaddset(&nmask, SIGHUP);
1368         sigprocmask(SIG_BLOCK, &nmask, &omask);
1369         error = getnameinfo((struct sockaddr *)f,
1370                             ((struct sockaddr *)f)->sa_len,
1371                             hname, sizeof hname, NULL, 0,
1372                             NI_NAMEREQD | withscopeid);
1373         sigprocmask(SIG_SETMASK, &omask, NULL);
1374         if (error) {
1375                 dprintf("Host name for your address (%s) unknown\n", ip);
1376                 return (ip);
1377         }
1378         hl = strlen(hname);
1379         if (hl > 0 && hname[hl-1] == '.')
1380                 hname[--hl] = '\0';
1381         trimdomain(hname, hl);
1382         return (hname);
1383 }
1384
1385 static void
1386 dodie(int signo)
1387 {
1388
1389         WantDie = signo;
1390 }
1391
1392 static void
1393 domark(int signo __unused)
1394 {
1395
1396         MarkSet = 1;
1397 }
1398
1399 /*
1400  * Print syslogd errors some place.
1401  */
1402 static void
1403 logerror(const char *type)
1404 {
1405         char buf[512];
1406         static int recursed = 0;
1407
1408         /* If there's an error while trying to log an error, give up. */
1409         if (recursed)
1410                 return;
1411         recursed++;
1412         if (errno)
1413                 (void)snprintf(buf,
1414                     sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1415         else
1416                 (void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1417         errno = 0;
1418         dprintf("%s\n", buf);
1419         logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1420         recursed--;
1421 }
1422
1423 static void
1424 die(int signo)
1425 {
1426         struct filed *f;
1427         int was_initialized;
1428         char buf[100];
1429         int i;
1430
1431         was_initialized = Initialized;
1432         Initialized = 0;        /* Don't log SIGCHLDs. */
1433         for (f = Files; f != NULL; f = f->f_next) {
1434                 /* flush any pending output */
1435                 if (f->f_prevcount)
1436                         fprintlog(f, 0, (char *)NULL);
1437                 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) {
1438                         (void)close(f->f_file);
1439                         f->f_un.f_pipe.f_pid = 0;
1440                 }
1441         }
1442         Initialized = was_initialized;
1443         if (signo) {
1444                 dprintf("syslogd: exiting on signal %d\n", signo);
1445                 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1446                 errno = 0;
1447                 logerror(buf);
1448         }
1449         for (i = 0; i < nfunix; i++)
1450                 if (funixn[i] && funix[i] != -1)
1451                         (void)unlink(funixn[i]);
1452         exit(1);
1453 }
1454
1455 /*
1456  *  INIT -- Initialize syslogd from configuration table
1457  */
1458 static void
1459 init(int signo)
1460 {
1461         int i;
1462         FILE *cf;
1463         struct filed *f, *next, **nextp;
1464         char *p;
1465         char cline[LINE_MAX];
1466         char prog[NAME_MAX+1];
1467         char host[MAXHOSTNAMELEN];
1468         char oldLocalHostName[MAXHOSTNAMELEN];
1469         char hostMsg[2*MAXHOSTNAMELEN+40];
1470         char bootfileMsg[LINE_MAX];
1471
1472         dprintf("init\n");
1473
1474         /*
1475          * Load hostname (may have changed).
1476          */
1477         if (signo != 0)
1478                 (void)strlcpy(oldLocalHostName, LocalHostName,
1479                     sizeof(oldLocalHostName));
1480         if (gethostname(LocalHostName, sizeof(LocalHostName)))
1481                 err(EX_OSERR, "gethostname() failed");
1482         if ((p = strchr(LocalHostName, '.')) != NULL) {
1483                 *p++ = '\0';
1484                 LocalDomain = p;
1485         } else {
1486                 LocalDomain = "";
1487         }
1488
1489         /*
1490          *  Close all open log files.
1491          */
1492         Initialized = 0;
1493         for (f = Files; f != NULL; f = next) {
1494                 /* flush any pending output */
1495                 if (f->f_prevcount)
1496                         fprintlog(f, 0, (char *)NULL);
1497
1498                 switch (f->f_type) {
1499                 case F_FILE:
1500                 case F_FORW:
1501                 case F_CONSOLE:
1502                 case F_TTY:
1503                         (void)close(f->f_file);
1504                         break;
1505                 case F_PIPE:
1506                         if (f->f_un.f_pipe.f_pid > 0) {
1507                                 (void)close(f->f_file);
1508                                 deadq_enter(f->f_un.f_pipe.f_pid,
1509                                             f->f_un.f_pipe.f_pname);
1510                         }
1511                         f->f_un.f_pipe.f_pid = 0;
1512                         break;
1513                 case F_RING:
1514                         munmap(f->f_un.f_ring.f_footer,
1515                                 sizeof(struct clog_footer));
1516                         close(f->f_file);
1517                         break;
1518                 }
1519                 next = f->f_next;
1520                 if (f->f_program) free(f->f_program);
1521                 if (f->f_host) free(f->f_host);
1522                 free((char *)f);
1523         }
1524         Files = NULL;
1525         nextp = &Files;
1526
1527         /* open the configuration file */
1528         if ((cf = fopen(ConfFile, "r")) == NULL) {
1529                 dprintf("cannot open %s\n", ConfFile);
1530                 *nextp = (struct filed *)calloc(1, sizeof(*f));
1531                 if (*nextp == NULL) {
1532                         logerror("calloc");
1533                         exit(1);
1534                 }
1535                 cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1536                 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1537                 if ((*nextp)->f_next == NULL) {
1538                         logerror("calloc");
1539                         exit(1);
1540                 }
1541                 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1542                 Initialized = 1;
1543                 return;
1544         }
1545
1546         /*
1547          *  Foreach line in the conf table, open that file.
1548          */
1549         f = NULL;
1550         (void)strlcpy(host, "*", sizeof(host));
1551         (void)strlcpy(prog, "*", sizeof(prog));
1552         while (fgets(cline, sizeof(cline), cf) != NULL) {
1553                 /*
1554                  * check for end-of-section, comments, strip off trailing
1555                  * spaces and newline character. #!prog is treated specially:
1556                  * following lines apply only to that program.
1557                  */
1558                 for (p = cline; isspace(*p); ++p)
1559                         continue;
1560                 if (*p == 0)
1561                         continue;
1562                 if (*p == '#') {
1563                         p++;
1564                         if (*p != '!' && *p != '+' && *p != '-')
1565                                 continue;
1566                 }
1567                 if (*p == '+' || *p == '-') {
1568                         host[0] = *p++;
1569                         while (isspace(*p))
1570                                 p++;
1571                         if ((!*p) || (*p == '*')) {
1572                                 (void)strlcpy(host, "*", sizeof(host));
1573                                 continue;
1574                         }
1575                         if (*p == '@')
1576                                 p = LocalHostName;
1577                         for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1578                                 if (!isalnum(*p) && *p != '.' && *p != '-'
1579                                     && *p != ',')
1580                                         break;
1581                                 host[i] = *p++;
1582                         }
1583                         host[i] = '\0';
1584                         continue;
1585                 }
1586                 if (*p == '!') {
1587                         p++;
1588                         while (isspace(*p)) p++;
1589                         if ((!*p) || (*p == '*')) {
1590                                 (void)strlcpy(prog, "*", sizeof(prog));
1591                                 continue;
1592                         }
1593                         for (i = 0; i < NAME_MAX; i++) {
1594                                 if (!isprint(p[i]))
1595                                         break;
1596                                 prog[i] = p[i];
1597                         }
1598                         prog[i] = 0;
1599                         continue;
1600                 }
1601                 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1602                         cline[i] = '\0';
1603                 f = (struct filed *)calloc(1, sizeof(*f));
1604                 if (f == NULL) {
1605                         logerror("calloc");
1606                         exit(1);
1607                 }
1608                 *nextp = f;
1609                 nextp = &f->f_next;
1610                 cfline(cline, f, prog, host);
1611         }
1612
1613         /* close the configuration file */
1614         (void)fclose(cf);
1615
1616         Initialized = 1;
1617
1618         if (Debug) {
1619                 for (f = Files; f; f = f->f_next) {
1620                         for (i = 0; i <= LOG_NFACILITIES; i++)
1621                                 if (f->f_pmask[i] == INTERNAL_NOPRI)
1622                                         printf("X ");
1623                                 else
1624                                         printf("%d ", f->f_pmask[i]);
1625                         printf("%s: ", TypeNames[f->f_type]);
1626                         switch (f->f_type) {
1627                         case F_FILE:
1628                                 printf("%s", f->f_un.f_fname);
1629                                 break;
1630
1631                         case F_CONSOLE:
1632                         case F_TTY:
1633                                 printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1634                                 break;
1635
1636                         case F_FORW:
1637                                 printf("%s", f->f_un.f_forw.f_hname);
1638                                 break;
1639
1640                         case F_RING:
1641                                 printf("%s", f->f_un.f_ring.f_rname);
1642                                 break;
1643
1644                         case F_PIPE:
1645                                 printf("%s", f->f_un.f_pipe.f_pname);
1646                                 break;
1647
1648                         case F_USERS:
1649                                 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1650                                         printf("%s, ", f->f_un.f_uname[i]);
1651                                 break;
1652                         }
1653                         if (f->f_program)
1654                                 printf(" (%s)", f->f_program);
1655                         printf("\n");
1656                 }
1657         }
1658
1659         logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1660         dprintf("syslogd: restarted\n");
1661         /*
1662          * Log a change in hostname, but only on a restart.
1663          */
1664         if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1665                 (void)snprintf(hostMsg, sizeof(hostMsg),
1666                     "syslogd: hostname changed, \"%s\" to \"%s\"",
1667                     oldLocalHostName, LocalHostName);
1668                 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1669                 dprintf("%s\n", hostMsg);
1670         }
1671         /*
1672          * Log the kernel boot file if we aren't going to use it as
1673          * the prefix, and if this is *not* a restart.
1674          */
1675         if (signo == 0 && !use_bootfile) {
1676                 (void)snprintf(bootfileMsg, sizeof(bootfileMsg),
1677                     "syslogd: kernel boot file is %s", bootfile);
1678                 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1679                 dprintf("%s\n", bootfileMsg);
1680         }
1681 }
1682
1683 /*
1684  * Crack a configuration file line
1685  */
1686 static void
1687 cfline(const char *line, struct filed *f, const char *prog, const char *host)
1688 {
1689         struct addrinfo hints, *res;
1690         int error, i, pri, syncfile;
1691         const char *p, *q;
1692         char *bp;
1693         char buf[MAXLINE], ebuf[100];
1694         struct stat sb;
1695
1696         dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1697
1698         errno = 0;      /* keep strerror() stuff out of logerror messages */
1699
1700         /* clear out file entry */
1701         memset(f, 0, sizeof(*f));
1702         for (i = 0; i <= LOG_NFACILITIES; i++)
1703                 f->f_pmask[i] = INTERNAL_NOPRI;
1704
1705         /* save hostname if any */
1706         if (host && *host == '*')
1707                 host = NULL;
1708         if (host) {
1709                 int hl;
1710
1711                 f->f_host = strdup(host);
1712                 if (f->f_host == NULL) {
1713                         logerror("strdup");
1714                         exit(1);
1715                 }
1716                 hl = strlen(f->f_host);
1717                 if (hl > 0 && f->f_host[hl-1] == '.')
1718                         f->f_host[--hl] = '\0';
1719                 trimdomain(f->f_host, hl);
1720         }
1721
1722         /* save program name if any */
1723         if (prog && *prog == '*')
1724                 prog = NULL;
1725         if (prog) {
1726                 f->f_program = strdup(prog);
1727                 if (f->f_program == NULL) {
1728                         logerror("strdup");
1729                         exit(1);
1730                 }
1731         }
1732
1733         /* scan through the list of selectors */
1734         for (p = line; *p && *p != '\t' && *p != ' ';) {
1735                 int pri_done;
1736                 int pri_cmp;
1737                 int pri_invert;
1738
1739                 /* find the end of this facility name list */
1740                 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1741                         continue;
1742
1743                 /* get the priority comparison */
1744                 pri_cmp = 0;
1745                 pri_done = 0;
1746                 pri_invert = 0;
1747                 if (*q == '!') {
1748                         pri_invert = 1;
1749                         q++;
1750                 }
1751                 while (!pri_done) {
1752                         switch (*q) {
1753                         case '<':
1754                                 pri_cmp |= PRI_LT;
1755                                 q++;
1756                                 break;
1757                         case '=':
1758                                 pri_cmp |= PRI_EQ;
1759                                 q++;
1760                                 break;
1761                         case '>':
1762                                 pri_cmp |= PRI_GT;
1763                                 q++;
1764                                 break;
1765                         default:
1766                                 pri_done++;
1767                                 break;
1768                         }
1769                 }
1770
1771                 /* collect priority name */
1772                 for (bp = buf; *q && !strchr("\t,; ", *q); )
1773                         *bp++ = *q++;
1774                 *bp = '\0';
1775
1776                 /* skip cruft */
1777                 while (strchr(",;", *q))
1778                         q++;
1779
1780                 /* decode priority name */
1781                 if (*buf == '*') {
1782                         pri = LOG_PRIMASK + 1;
1783                         pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1784                 } else {
1785                         /* Ignore trailing spaces. */
1786                         for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
1787                                 buf[i] = '\0';
1788
1789                         pri = decode(buf, prioritynames);
1790                         if (pri < 0) {
1791                                 (void)snprintf(ebuf, sizeof ebuf,
1792                                     "unknown priority name \"%s\"", buf);
1793                                 logerror(ebuf);
1794                                 return;
1795                         }
1796                 }
1797                 if (!pri_cmp)
1798                         pri_cmp = (UniquePriority)
1799                                   ? (PRI_EQ)
1800                                   : (PRI_EQ | PRI_GT)
1801                                   ;
1802                 if (pri_invert)
1803                         pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
1804
1805                 /* scan facilities */
1806                 while (*p && !strchr("\t.; ", *p)) {
1807                         for (bp = buf; *p && !strchr("\t,;. ", *p); )
1808                                 *bp++ = *p++;
1809                         *bp = '\0';
1810
1811                         if (*buf == '*') {
1812                                 for (i = 0; i < LOG_NFACILITIES; i++) {
1813                                         f->f_pmask[i] = pri;
1814                                         f->f_pcmp[i] = pri_cmp;
1815                                 }
1816                         } else {
1817                                 i = decode(buf, facilitynames);
1818                                 if (i < 0) {
1819                                         (void)snprintf(ebuf, sizeof ebuf,
1820                                             "unknown facility name \"%s\"",
1821                                             buf);
1822                                         logerror(ebuf);
1823                                         return;
1824                                 }
1825                                 f->f_pmask[i >> 3] = pri;
1826                                 f->f_pcmp[i >> 3] = pri_cmp;
1827                         }
1828                         while (*p == ',' || *p == ' ')
1829                                 p++;
1830                 }
1831
1832                 p = q;
1833         }
1834
1835         /* skip to action part */
1836         while (*p == '\t' || *p == ' ')
1837                 p++;
1838
1839         if (*p == '-') {
1840                 syncfile = 0;
1841                 p++;
1842         } else
1843                 syncfile = 1;
1844
1845         switch (*p) {
1846         case '@':
1847                 (void)strlcpy(f->f_un.f_forw.f_hname, ++p,
1848                         sizeof(f->f_un.f_forw.f_hname));
1849                 memset(&hints, 0, sizeof(hints));
1850                 hints.ai_family = family;
1851                 hints.ai_socktype = SOCK_DGRAM;
1852                 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints,
1853                                     &res);
1854                 if (error) {
1855                         logerror(gai_strerror(error));
1856                         break;
1857                 }
1858                 f->f_un.f_forw.f_addr = res;
1859                 f->f_type = F_FORW;
1860                 break;
1861
1862         case '/':
1863                 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
1864                         f->f_type = F_UNUSED;
1865                         logerror(p);
1866                         break;
1867                 }
1868                 if (syncfile)
1869                         f->f_flags |= FFLAG_SYNC;
1870                 if (isatty(f->f_file)) {
1871                         if (strcmp(p, ctty) == 0)
1872                                 f->f_type = F_CONSOLE;
1873                         else
1874                                 f->f_type = F_TTY;
1875                         (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
1876                             sizeof(f->f_un.f_fname));
1877                 } else {
1878                         (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
1879                         f->f_type = F_FILE;
1880                 }
1881                 break;
1882
1883         case '%':
1884                 if ((f->f_file = open(p + 1, O_RDWR, 0 )) < 0) {
1885                         f->f_type = F_UNUSED;
1886                         logerror(p + 1);
1887                         break;
1888                 }
1889                 if (fstat(f->f_file,&sb) < 0) {
1890                         close(f->f_file);
1891                         f->f_type = F_UNUSED;
1892                         logerror(p+1);
1893                         break;
1894                 }
1895                 f->f_un.f_ring.f_footer = 
1896                         mmap(NULL, sizeof(struct clog_footer), 
1897                              PROT_READ|PROT_WRITE, MAP_SHARED, 
1898                              f->f_file, sb.st_size-sizeof(struct clog_footer));
1899                 if (f->f_un.f_ring.f_footer == NULL) {
1900                         close(f->f_file);
1901                         f->f_type = F_UNUSED;
1902                         logerror(p + 1);
1903                         break;
1904                 }
1905                 if (memcmp(&(f->f_un.f_ring.f_footer->cf_magic), MAGIC_CONST, 4) != 0) {
1906                         munmap(f->f_un.f_ring.f_footer,
1907                                 sizeof(struct clog_footer));
1908                         close(f->f_file);
1909                         f->f_type = F_UNUSED;
1910                         errno = ENODEV;
1911                         logerror(p + 1);
1912                         break;
1913                 }
1914                 f->f_un.f_ring.f_size = sb.st_size;
1915                 strcpy(f->f_un.f_ring.f_rname, p + 1);
1916                 f->f_type = F_RING;
1917                 break;
1918
1919         case '|':
1920                 f->f_un.f_pipe.f_pid = 0;
1921                 (void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname));
1922                 f->f_type = F_PIPE;
1923                 break;
1924
1925         case '*':
1926                 f->f_type = F_WALL;
1927                 break;
1928
1929         default:
1930                 for (i = 0; i < MAXUNAMES && *p; i++) {
1931                         for (q = p; *q && *q != ','; )
1932                                 q++;
1933                         (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
1934                         if ((q - p) > UT_NAMESIZE)
1935                                 f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
1936                         else
1937                                 f->f_un.f_uname[i][q - p] = '\0';
1938                         while (*q == ',' || *q == ' ')
1939                                 q++;
1940                         p = q;
1941                 }
1942                 f->f_type = F_USERS;
1943                 break;
1944         }
1945 }
1946
1947
1948 /*
1949  *  Decode a symbolic name to a numeric value
1950  */
1951 static int
1952 decode(const char *name, CODE *codetab)
1953 {
1954         CODE *c;
1955         char *p, buf[40];
1956
1957         if (isdigit(*name))
1958                 return (atoi(name));
1959
1960         for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
1961                 if (isupper(*name))
1962                         *p = tolower(*name);
1963                 else
1964                         *p = *name;
1965         }
1966         *p = '\0';
1967         for (c = codetab; c->c_name; c++)
1968                 if (!strcmp(buf, c->c_name))
1969                         return (c->c_val);
1970
1971         return (-1);
1972 }
1973
1974 static void
1975 markit(void)
1976 {
1977         struct filed *f;
1978         dq_t q, next;
1979
1980         now = time((time_t *)NULL);
1981         MarkSeq += TIMERINTVL;
1982         if (MarkSeq >= MarkInterval) {
1983                 logmsg(LOG_INFO, "-- MARK --",
1984                     LocalHostName, ADDDATE|MARK);
1985                 MarkSeq = 0;
1986         }
1987
1988         for (f = Files; f; f = f->f_next) {
1989                 if (f->f_prevcount && now >= REPEATTIME(f)) {
1990                         dprintf("flush %s: repeated %d times, %d sec.\n",
1991                             TypeNames[f->f_type], f->f_prevcount,
1992                             repeatinterval[f->f_repeatcount]);
1993                         fprintlog(f, 0, (char *)NULL);
1994                         BACKOFF(f);
1995                 }
1996         }
1997
1998         /* Walk the dead queue, and see if we should signal somebody. */
1999         for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2000                 next = TAILQ_NEXT(q, dq_entries);
2001
2002                 switch (q->dq_timeout) {
2003                 case 0:
2004                         /* Already signalled once, try harder now. */
2005                         if (kill(q->dq_pid, SIGKILL) != 0)
2006                                 (void)deadq_remove(q->dq_pid);
2007                         break;
2008
2009                 case 1:
2010                         /*
2011                          * Timed out on dead queue, send terminate
2012                          * signal.  Note that we leave the removal
2013                          * from the dead queue to reapchild(), which
2014                          * will also log the event (unless the process
2015                          * didn't even really exist, in case we simply
2016                          * drop it from the dead queue).
2017                          */
2018                         if (kill(q->dq_pid, SIGTERM) != 0)
2019                                 (void)deadq_remove(q->dq_pid);
2020                         /* FALLTHROUGH */
2021
2022                 default:
2023                         q->dq_timeout--;
2024                 }
2025         }
2026         MarkSet = 0;
2027         (void)alarm(TIMERINTVL);
2028 }
2029
2030 /*
2031  * fork off and become a daemon, but wait for the child to come online
2032  * before returing to the parent, or we get disk thrashing at boot etc.
2033  * Set a timer so we don't hang forever if it wedges.
2034  */
2035 static int
2036 waitdaemon(int nochdir, int noclose, int maxwait)
2037 {
2038         int fd;
2039         int status;
2040         pid_t pid, childpid;
2041
2042         switch (childpid = fork()) {
2043         case -1:
2044                 return (-1);
2045         case 0:
2046                 break;
2047         default:
2048                 signal(SIGALRM, timedout);
2049                 alarm(maxwait);
2050                 while ((pid = wait3(&status, 0, NULL)) != -1) {
2051                         if (WIFEXITED(status))
2052                                 errx(1, "child pid %d exited with return code %d",
2053                                         pid, WEXITSTATUS(status));
2054                         if (WIFSIGNALED(status))
2055                                 errx(1, "child pid %d exited on signal %d%s",
2056                                         pid, WTERMSIG(status),
2057                                         WCOREDUMP(status) ? " (core dumped)" :
2058                                         "");
2059                         if (pid == childpid)    /* it's gone... */
2060                                 break;
2061                 }
2062                 exit(0);
2063         }
2064
2065         if (setsid() == -1)
2066                 return (-1);
2067
2068         if (!nochdir)
2069                 (void)chdir("/");
2070
2071         if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2072                 (void)dup2(fd, STDIN_FILENO);
2073                 (void)dup2(fd, STDOUT_FILENO);
2074                 (void)dup2(fd, STDERR_FILENO);
2075                 if (fd > 2)
2076                         (void)close (fd);
2077         }
2078         return (getppid());
2079 }
2080
2081 /*
2082  * We get a SIGALRM from the child when it's running and finished doing it's
2083  * fsync()'s or O_SYNC writes for all the boot messages.
2084  *
2085  * We also get a signal from the kernel if the timer expires, so check to
2086  * see what happened.
2087  */
2088 static void
2089 timedout(int sig __unused)
2090 {
2091         int left;
2092         left = alarm(0);
2093         signal(SIGALRM, SIG_DFL);
2094         if (left == 0)
2095                 errx(1, "timed out waiting for child");
2096         else
2097                 _exit(0);
2098 }
2099
2100 /*
2101  * Add `s' to the list of allowable peer addresses to accept messages
2102  * from.
2103  *
2104  * `s' is a string in the form:
2105  *
2106  *    [*]domainname[:{servicename|portnumber|*}]
2107  *
2108  * or
2109  *
2110  *    netaddr/maskbits[:{servicename|portnumber|*}]
2111  *
2112  * Returns -1 on error, 0 if the argument was valid.
2113  */
2114 static int
2115 allowaddr(char *s)
2116 {
2117         char *cp1, *cp2;
2118         struct allowedpeer ap;
2119         struct servent *se;
2120         int masklen = -1, i;
2121         struct addrinfo hints, *res;
2122         struct in_addr *addrp, *maskp;
2123         u_int32_t *addr6p, *mask6p;
2124         char ip[NI_MAXHOST];
2125
2126 #ifdef INET6
2127         if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2128 #endif
2129                 cp1 = s;
2130         if ((cp1 = strrchr(cp1, ':'))) {
2131                 /* service/port provided */
2132                 *cp1++ = '\0';
2133                 if (strlen(cp1) == 1 && *cp1 == '*')
2134                         /* any port allowed */
2135                         ap.port = 0;
2136                 else if ((se = getservbyname(cp1, "udp"))) {
2137                         ap.port = ntohs(se->s_port);
2138                 } else {
2139                         ap.port = strtol(cp1, &cp2, 0);
2140                         if (*cp2 != '\0')
2141                                 return (-1); /* port not numeric */
2142                 }
2143         } else {
2144                 if ((se = getservbyname("syslog", "udp")))
2145                         ap.port = ntohs(se->s_port);
2146                 else
2147                         /* sanity, should not happen */
2148                         ap.port = 514;
2149         }
2150
2151         if ((cp1 = strchr(s, '/')) != NULL &&
2152             strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2153                 *cp1 = '\0';
2154                 if ((masklen = atoi(cp1 + 1)) < 0)
2155                         return (-1);
2156         }
2157 #ifdef INET6
2158         if (*s == '[') {
2159                 cp2 = s + strlen(s) - 1;
2160                 if (*cp2 == ']') {
2161                         ++s;
2162                         *cp2 = '\0';
2163                 } else {
2164                         cp2 = NULL;
2165                 }
2166         } else {
2167                 cp2 = NULL;
2168         }
2169 #endif
2170         memset(&hints, 0, sizeof(hints));
2171         hints.ai_family = PF_UNSPEC;
2172         hints.ai_socktype = SOCK_DGRAM;
2173         hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2174         if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2175                 ap.isnumeric = 1;
2176                 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2177                 memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2178                 ap.a_mask.ss_family = res->ai_family;
2179                 if (res->ai_family == AF_INET) {
2180                         ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2181                         maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2182                         addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2183                         if (masklen < 0) {
2184                                 /* use default netmask */
2185                                 if (IN_CLASSA(ntohl(addrp->s_addr)))
2186                                         maskp->s_addr = htonl(IN_CLASSA_NET);
2187                                 else if (IN_CLASSB(ntohl(addrp->s_addr)))
2188                                         maskp->s_addr = htonl(IN_CLASSB_NET);
2189                                 else
2190                                         maskp->s_addr = htonl(IN_CLASSC_NET);
2191                         } else if (masklen <= 32) {
2192                                 /* convert masklen to netmask */
2193                                 if (masklen == 0)
2194                                         maskp->s_addr = 0;
2195                                 else
2196                                         maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2197                         } else {
2198                                 freeaddrinfo(res);
2199                                 return (-1);
2200                         }
2201                         /* Lose any host bits in the network number. */
2202                         addrp->s_addr &= maskp->s_addr;
2203                 }
2204 #ifdef INET6
2205                 else if (res->ai_family == AF_INET6 && masklen <= 128) {
2206                         ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2207                         if (masklen < 0)
2208                                 masklen = 128;
2209                         mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2210                         /* convert masklen to netmask */
2211                         while (masklen > 0) {
2212                                 if (masklen < 32) {
2213                                         *mask6p = htonl(~(0xffffffff >> masklen));
2214                                         break;
2215                                 }
2216                                 *mask6p++ = 0xffffffff;
2217                                 masklen -= 32;
2218                         }
2219                         /* Lose any host bits in the network number. */
2220                         mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2221                         addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2222                         for (i = 0; i < 4; i++)
2223                                 addr6p[i] &= mask6p[i];
2224                 }
2225 #endif
2226                 else {
2227                         freeaddrinfo(res);
2228                         return (-1);
2229                 }
2230                 freeaddrinfo(res);
2231         } else {
2232                 /* arg `s' is domain name */
2233                 ap.isnumeric = 0;
2234                 ap.a_name = s;
2235                 if (cp1)
2236                         *cp1 = '/';
2237 #ifdef INET6
2238                 if (cp2) {
2239                         *cp2 = ']';
2240                         --s;
2241                 }
2242 #endif
2243         }
2244
2245         if (Debug) {
2246                 printf("allowaddr: rule %d: ", NumAllowed);
2247                 if (ap.isnumeric) {
2248                         printf("numeric, ");
2249                         getnameinfo((struct sockaddr *)&ap.a_addr,
2250                                     ((struct sockaddr *)&ap.a_addr)->sa_len,
2251                                     ip, sizeof ip, NULL, 0,
2252                                     NI_NUMERICHOST | withscopeid);
2253                         printf("addr = %s, ", ip);
2254                         getnameinfo((struct sockaddr *)&ap.a_mask,
2255                                     ((struct sockaddr *)&ap.a_mask)->sa_len,
2256                                     ip, sizeof ip, NULL, 0,
2257                                     NI_NUMERICHOST | withscopeid);
2258                         printf("mask = %s; ", ip);
2259                 } else {
2260                         printf("domainname = %s; ", ap.a_name);
2261                 }
2262                 printf("port = %d\n", ap.port);
2263         }
2264
2265         if ((AllowedPeers = realloc(AllowedPeers,
2266                                     ++NumAllowed * sizeof(struct allowedpeer)))
2267             == NULL) {
2268                 logerror("realloc");
2269                 exit(1);
2270         }
2271         memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2272         return (0);
2273 }
2274
2275 /*
2276  * Validate that the remote peer has permission to log to us.
2277  */
2278 static int
2279 validate(struct sockaddr *sa, const char *hname)
2280 {
2281         int i, j, reject;
2282         size_t l1, l2;
2283         char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2284         struct allowedpeer *ap;
2285         struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2286         struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2287         struct addrinfo hints, *res;
2288         u_short sport;
2289
2290         if (NumAllowed == 0)
2291                 /* traditional behaviour, allow everything */
2292                 return (1);
2293
2294         (void)strlcpy(name, hname, sizeof(name));
2295         memset(&hints, 0, sizeof(hints));
2296         hints.ai_family = PF_UNSPEC;
2297         hints.ai_socktype = SOCK_DGRAM;
2298         hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2299         if (getaddrinfo(name, NULL, &hints, &res) == 0)
2300                 freeaddrinfo(res);
2301         else if (strchr(name, '.') == NULL) {
2302                 strlcat(name, ".", sizeof name);
2303                 strlcat(name, LocalDomain, sizeof name);
2304         }
2305         if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2306                         NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0)
2307                 return (0);     /* for safety, should not occur */
2308         dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2309                 ip, port, name);
2310         sport = atoi(port);
2311
2312         /* now, walk down the list */
2313         for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2314                 if (ap->port != 0 && ap->port != sport) {
2315                         dprintf("rejected in rule %d due to port mismatch.\n", i);
2316                         continue;
2317                 }
2318
2319                 if (ap->isnumeric) {
2320                         if (ap->a_addr.ss_family != sa->sa_family) {
2321                                 dprintf("rejected in rule %d due to address family mismatch.\n", i);
2322                                 continue;
2323                         }
2324                         if (ap->a_addr.ss_family == AF_INET) {
2325                                 sin4 = (struct sockaddr_in *)sa;
2326                                 a4p = (struct sockaddr_in *)&ap->a_addr;
2327                                 m4p = (struct sockaddr_in *)&ap->a_mask;
2328                                 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2329                                     != a4p->sin_addr.s_addr) {
2330                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
2331                                         continue;
2332                                 }
2333                         }
2334 #ifdef INET6
2335                         else if (ap->a_addr.ss_family == AF_INET6) {
2336                                 sin6 = (struct sockaddr_in6 *)sa;
2337                                 a6p = (struct sockaddr_in6 *)&ap->a_addr;
2338                                 m6p = (struct sockaddr_in6 *)&ap->a_mask;
2339 #ifdef NI_WITHSCOPEID
2340                                 if (a6p->sin6_scope_id != 0 &&
2341                                     sin6->sin6_scope_id != a6p->sin6_scope_id) {
2342                                         dprintf("rejected in rule %d due to scope mismatch.\n", i);
2343                                         continue;
2344                                 }
2345 #endif
2346                                 reject = 0;
2347                                 for (j = 0; j < 16; j += 4) {
2348                                         if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2349                                             != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2350                                                 ++reject;
2351                                                 break;
2352                                         }
2353                                 }
2354                                 if (reject) {
2355                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
2356                                         continue;
2357                                 }
2358                         }
2359 #endif
2360                         else
2361                                 continue;
2362                 } else {
2363                         cp = ap->a_name;
2364                         l1 = strlen(name);
2365                         if (*cp == '*') {
2366                                 /* allow wildmatch */
2367                                 cp++;
2368                                 l2 = strlen(cp);
2369                                 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2370                                         dprintf("rejected in rule %d due to name mismatch.\n", i);
2371                                         continue;
2372                                 }
2373                         } else {
2374                                 /* exact match */
2375                                 l2 = strlen(cp);
2376                                 if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2377                                         dprintf("rejected in rule %d due to name mismatch.\n", i);
2378                                         continue;
2379                                 }
2380                         }
2381                 }
2382                 dprintf("accepted in rule %d.\n", i);
2383                 return (1);     /* hooray! */
2384         }
2385         return (0);
2386 }
2387
2388 /*
2389  * Fairly similar to popen(3), but returns an open descriptor, as
2390  * opposed to a FILE *.
2391  */
2392 static int
2393 p_open(const char *prog, pid_t *rpid)
2394 {
2395         int pfd[2], nulldesc, i;
2396         pid_t pid;
2397         sigset_t omask, mask;
2398         char *argv[4]; /* sh -c cmd NULL */
2399         char errmsg[200];
2400
2401         if (pipe(pfd) == -1)
2402                 return (-1);
2403         if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2404                 /* we are royally screwed anyway */
2405                 return (-1);
2406
2407         sigemptyset(&mask);
2408         sigaddset(&mask, SIGALRM);
2409         sigaddset(&mask, SIGHUP);
2410         sigprocmask(SIG_BLOCK, &mask, &omask);
2411         switch ((pid = fork())) {
2412         case -1:
2413                 sigprocmask(SIG_SETMASK, &omask, 0);
2414                 close(nulldesc);
2415                 return (-1);
2416
2417         case 0:
2418                 argv[0] = strdup("sh");
2419                 argv[1] = strdup("-c");
2420                 argv[2] = strdup(prog);
2421                 argv[3] = NULL;
2422                 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2423                         logerror("strdup");
2424                         exit(1);
2425                 }
2426
2427                 alarm(0);
2428                 (void)setsid(); /* Avoid catching SIGHUPs. */
2429
2430                 /*
2431                  * Throw away pending signals, and reset signal
2432                  * behaviour to standard values.
2433                  */
2434                 signal(SIGALRM, SIG_IGN);
2435                 signal(SIGHUP, SIG_IGN);
2436                 sigprocmask(SIG_SETMASK, &omask, 0);
2437                 signal(SIGPIPE, SIG_DFL);
2438                 signal(SIGQUIT, SIG_DFL);
2439                 signal(SIGALRM, SIG_DFL);
2440                 signal(SIGHUP, SIG_DFL);
2441
2442                 dup2(pfd[0], STDIN_FILENO);
2443                 dup2(nulldesc, STDOUT_FILENO);
2444                 dup2(nulldesc, STDERR_FILENO);
2445                 for (i = getdtablesize(); i > 2; i--)
2446                         (void)close(i);
2447
2448                 (void)execvp(_PATH_BSHELL, argv);
2449                 _exit(255);
2450         }
2451
2452         sigprocmask(SIG_SETMASK, &omask, 0);
2453         close(nulldesc);
2454         close(pfd[0]);
2455         /*
2456          * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
2457          * supposed to get an EWOULDBLOCK on writev(2), which is
2458          * caught by the logic above anyway, which will in turn close
2459          * the pipe, and fork a new logging subprocess if necessary.
2460          * The stale subprocess will be killed some time later unless
2461          * it terminated itself due to closing its input pipe (so we
2462          * get rid of really dead puppies).
2463          */
2464         if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2465                 /* This is bad. */
2466                 (void)snprintf(errmsg, sizeof errmsg,
2467                                "Warning: cannot change pipe to PID %d to "
2468                                "non-blocking behaviour.",
2469                                (int)pid);
2470                 logerror(errmsg);
2471         }
2472         *rpid = pid;
2473         return (pfd[1]);
2474 }
2475
2476 static void
2477 deadq_enter(pid_t pid, const char *name)
2478 {
2479         dq_t p;
2480         int status;
2481
2482         /*
2483          * Be paranoid, if we can't signal the process, don't enter it
2484          * into the dead queue (perhaps it's already dead).  If possible,
2485          * we try to fetch and log the child's status.
2486          */
2487         if (kill(pid, 0) != 0) {
2488                 if (waitpid(pid, &status, WNOHANG) > 0)
2489                         log_deadchild(pid, status, name);
2490                 return;
2491         }
2492
2493         p = malloc(sizeof(struct deadq_entry));
2494         if (p == NULL) {
2495                 logerror("malloc");
2496                 exit(1);
2497         }
2498
2499         p->dq_pid = pid;
2500         p->dq_timeout = DQ_TIMO_INIT;
2501         TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2502 }
2503
2504 static int
2505 deadq_remove(pid_t pid)
2506 {
2507         dq_t q;
2508
2509         TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2510                 if (q->dq_pid == pid) {
2511                         TAILQ_REMOVE(&deadq_head, q, dq_entries);
2512                                 free(q);
2513                                 return (1);
2514                 }
2515         }
2516
2517         return (0);
2518 }
2519
2520 static void
2521 log_deadchild(pid_t pid, int status, const char *name)
2522 {
2523         int code;
2524         char buf[256];
2525         const char *reason;
2526
2527         errno = 0; /* Keep strerror() stuff out of logerror messages. */
2528         if (WIFSIGNALED(status)) {
2529                 reason = "due to signal";
2530                 code = WTERMSIG(status);
2531         } else {
2532                 reason = "with status";
2533                 code = WEXITSTATUS(status);
2534                 if (code == 0)
2535                         return;
2536         }
2537         (void)snprintf(buf, sizeof buf,
2538                        "Logging subprocess %d (%s) exited %s %d.",
2539                        pid, name, reason, code);
2540         logerror(buf);
2541 }
2542
2543 static int *
2544 socksetup(int af, const char *bindhostname)
2545 {
2546         struct addrinfo hints, *res, *r;
2547         int error, maxs, *s, *socks;
2548
2549         memset(&hints, 0, sizeof(hints));
2550         hints.ai_flags = AI_PASSIVE;
2551         hints.ai_family = af;
2552         hints.ai_socktype = SOCK_DGRAM;
2553         error = getaddrinfo(bindhostname, "syslog", &hints, &res);
2554         if (error) {
2555                 logerror(gai_strerror(error));
2556                 errno = 0;
2557                 die(0);
2558         }
2559
2560         /* Count max number of sockets we may open */
2561         for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2562         socks = malloc((maxs+1) * sizeof(int));
2563         if (socks == NULL) {
2564                 logerror("couldn't allocate memory for sockets");
2565                 die(0);
2566         }
2567
2568         *socks = 0;   /* num of sockets counter at start of array */
2569         s = socks + 1;
2570         for (r = res; r; r = r->ai_next) {
2571                 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2572                 if (*s < 0) {
2573                         logerror("socket");
2574                         continue;
2575                 }
2576                 if (r->ai_family == AF_INET6) {
2577                         int on = 1;
2578                         if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2579                                        (char *)&on, sizeof (on)) < 0) {
2580                                 logerror("setsockopt");
2581                                 close(*s);
2582                                 continue;
2583                         }
2584                 }
2585                 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2586                         close(*s);
2587                         logerror("bind");
2588                         continue;
2589                 }
2590
2591                 (*socks)++;
2592                 s++;
2593         }
2594
2595         if (*socks == 0) {
2596                 free(socks);
2597                 if (Debug)
2598                         return (NULL);
2599                 else
2600                         die(0);
2601         }
2602         if (res)
2603                 freeaddrinfo(res);
2604
2605         return (socks);
2606 }
2607
2608 ssize_t
2609 rbwritev(struct filed *f, struct iovec *iov, int iovcnt) 
2610 {
2611         int i;
2612         ssize_t out = 0;
2613         ssize_t error;
2614
2615         for (i = 0; i < iovcnt; i++) {
2616                 error = rbwrite(f, iov[i].iov_base, iov[i].iov_len);
2617                 if (error == -1)
2618                         return (-1);
2619                 out += error;
2620         }
2621         return (out);
2622 }
2623
2624
2625 ssize_t
2626 rbwrite(struct filed *f, char *buf, size_t nbytes) 
2627 {
2628         size_t maxwrite;
2629         ssize_t error;
2630         ssize_t out;
2631
2632         maxwrite = f->f_un.f_ring.f_footer->cf_max - 
2633                    f->f_un.f_ring.f_footer->cf_next;
2634         out = 0;
2635
2636         f->f_un.f_ring.f_footer->cf_lock = 1;
2637         while (nbytes > 0) {
2638                 maxwrite = f->f_un.f_ring.f_footer->cf_max - 
2639                            f->f_un.f_ring.f_footer->cf_next;
2640                 if (maxwrite > nbytes)
2641                         maxwrite = nbytes;
2642                 error = pwrite(f->f_file, buf, maxwrite,
2643                                f->f_un.f_ring.f_footer->cf_next);
2644                 if (error == -1) {
2645                         f->f_un.f_ring.f_footer->cf_lock = 0;
2646                         return (-1);
2647                 }
2648                 nbytes -= error;
2649                 out += error;
2650                 buf += error;
2651                 f->f_un.f_ring.f_footer->cf_next += error;
2652                 if (f->f_un.f_ring.f_footer->cf_next == 
2653                     f->f_un.f_ring.f_footer->cf_max) {
2654                         f->f_un.f_ring.f_footer->cf_next = 0;
2655                         f->f_un.f_ring.f_footer->cf_wrap = 1;
2656                 }
2657                 
2658         }
2659                         
2660         f->f_un.f_ring.f_footer->cf_lock = 0;
2661         return (out);
2662 }