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1.1.2.1 misho 1: /*
2: * Copyright (c) 1983, 1988, 1993, 1994
3: * The Regents of the University of California. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 4. Neither the name of the University nor the names of its contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: #ifndef lint
31: static const char copyright[] =
32: "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\
33: The Regents of the University of California. All rights reserved.\n";
34: #endif /* not lint */
35:
36: #ifndef lint
37: #if 0
38: static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94";
39: #endif
40: #endif /* not lint */
41:
42: #include <sys/cdefs.h>
43: __FBSDID("$FreeBSD: src/usr.sbin/syslogd/syslogd.c,v 1.167 2010/08/07 16:20:12 olli Exp $");
44:
45: /*
46: * syslogd -- log system messages
47: *
48: * This program implements a system log. It takes a series of lines.
49: * Each line may have a priority, signified as "<n>" as
50: * the first characters of the line. If this is
51: * not present, a default priority is used.
52: *
53: * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will
54: * cause it to reread its configuration file.
55: *
56: * Defined Constants:
57: *
58: * MAXLINE -- the maximum line length that can be handled.
59: * DEFUPRI -- the default priority for user messages
60: * DEFSPRI -- the default priority for kernel messages
61: *
62: * Author: Eric Allman
63: * extensive changes by Ralph Campbell
64: * more extensive changes by Eric Allman (again)
65: * Extension to log by program name as well as facility and priority
66: * by Peter da Silva.
67: * -u and -v by Harlan Stenn.
68: * Priority comparison code by Harlan Stenn.
69: */
70:
71: #define MAXLINE 1024 /* maximum line length */
72: #define MAXSVLINE 120 /* maximum saved line length */
73: #define DEFUPRI (LOG_USER|LOG_NOTICE)
74: #define DEFSPRI (LOG_KERN|LOG_CRIT)
75: #define TIMERINTVL 30 /* interval for checking flush, mark */
76: #define TTYMSGTIME 1 /* timeout passed to ttymsg */
77:
1.1.2.5 ! misho 78: #include "config.h"
! 79:
1.1.2.1 misho 80: #include <sys/param.h>
81: #include <sys/ioctl.h>
82: #include <sys/mman.h>
83: #include <sys/stat.h>
84: #include <sys/wait.h>
85: #include <sys/socket.h>
86: #include <sys/queue.h>
87: #include <sys/uio.h>
88: #include <sys/un.h>
89: #include <sys/time.h>
90: #include <sys/resource.h>
91: #include <sys/syslimits.h>
92: #include <sys/types.h>
93:
94: #include <netinet/in.h>
95: #include <netdb.h>
96: #include <arpa/inet.h>
97:
98: #include <ctype.h>
99: #include <err.h>
100: #include <errno.h>
101: #include <fcntl.h>
1.1.2.5 ! misho 102: #ifdef HAVE_LIBUTIL
1.1.2.1 misho 103: #include <libutil.h>
1.1.2.5 ! misho 104: #endif
1.1.2.1 misho 105: #include <limits.h>
106: #include <paths.h>
107: #include <signal.h>
108: #include <stdio.h>
109: #include <stdlib.h>
110: #include <string.h>
111: #include <sysexits.h>
112: #include <unistd.h>
1.1.2.3 misho 113: #if defined(__FreeBSD__) && (__FreeBSD__ > 8)
1.1.2.1 misho 114: #include <utmpx.h>
1.1.2.3 misho 115: #else
116: #include <utmp.h>
117: #endif
1.1.2.1 misho 118:
119: #include "pathnames.h"
1.1.2.2 misho 120:
121: // CPP:
122: #include "defs.h"
123: #include "clog.h"
124: #include <sys/mman.h>
125: #include <dirent.h>
126: // CPP::
1.1.2.1 misho 127:
128: #define SYSLOG_NAMES
129: #include <sys/syslog.h>
130:
131: const char *ConfFile = _PATH_LOGCONF;
132: const char *PidFile = _PATH_LOGPID;
133: const char ctty[] = _PATH_CONSOLE;
134:
135: #define dprintf if (Debug) printf
136:
137: #define MAXUNAMES 20 /* maximum number of user names */
138:
139: /*
140: * Unix sockets.
141: * We have two default sockets, one with 666 permissions,
142: * and one for privileged programs.
143: */
144: struct funix {
145: int s;
146: const char *name;
147: mode_t mode;
148: STAILQ_ENTRY(funix) next;
149: };
150: struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
151: { NULL } };
152: struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE,
153: { &funix_secure } };
154:
155: STAILQ_HEAD(, funix) funixes = { &funix_default,
156: &(funix_secure.next.stqe_next) };
157:
158: /*
159: * Flags to logmsg().
160: */
161:
162: #define IGN_CONS 0x001 /* don't print on console */
163: #define SYNC_FILE 0x002 /* do fsync on file after printing */
164: #define ADDDATE 0x004 /* add a date to the message */
165: #define MARK 0x008 /* this message is a mark */
166: #define ISKERNEL 0x010 /* kernel generated message */
167:
168: /*
169: * This structure represents the files that will have log
170: * copies printed.
171: * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
172: * or if f_type if F_PIPE and f_pid > 0.
173: */
174:
175: struct filed {
176: struct filed *f_next; /* next in linked list */
177: short f_type; /* entry type, see below */
178: short f_file; /* file descriptor */
179: time_t f_time; /* time this was last written */
180: char *f_host; /* host from which to recd. */
181: u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */
182: u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */
183: #define PRI_LT 0x1
184: #define PRI_EQ 0x2
185: #define PRI_GT 0x4
186: char *f_program; /* program this applies to */
187: union {
188: char f_uname[MAXUNAMES][MAXLOGNAME];
189: struct {
190: char f_hname[MAXHOSTNAMELEN];
191: struct addrinfo *f_addr;
192:
193: } f_forw; /* forwarding address */
194: char f_fname[MAXPATHLEN];
195: struct {
196: char f_pname[MAXPATHLEN];
197: pid_t f_pid;
198: } f_pipe;
1.1.2.2 misho 199: // CPP:
200: struct {
201: char f_rname[MAXPATHLEN];
202: struct clogFooter *f_footer;
203: size_t f_size;
204: } f_ring;
205: // CPP::
1.1.2.1 misho 206: } f_un;
207: char f_prevline[MAXSVLINE]; /* last message logged */
208: char f_lasttime[16]; /* time of last occurrence */
209: char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */
210: int f_prevpri; /* pri of f_prevline */
211: int f_prevlen; /* length of f_prevline */
212: int f_prevcount; /* repetition cnt of prevline */
213: u_int f_repeatcount; /* number of "repeated" msgs */
214: int f_flags; /* file-specific flags */
215: #define FFLAG_SYNC 0x01
216: #define FFLAG_NEEDSYNC 0x02
217: };
218:
219: /*
220: * Queue of about-to-be dead processes we should watch out for.
221: */
222:
223: TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
224: struct stailhead *deadq_headp;
225:
226: struct deadq_entry {
227: pid_t dq_pid;
228: int dq_timeout;
229: TAILQ_ENTRY(deadq_entry) dq_entries;
230: };
231:
232: /*
233: * The timeout to apply to processes waiting on the dead queue. Unit
234: * of measure is `mark intervals', i.e. 20 minutes by default.
235: * Processes on the dead queue will be terminated after that time.
236: */
237:
238: #define DQ_TIMO_INIT 2
239:
240: typedef struct deadq_entry *dq_t;
241:
242:
243: /*
244: * Struct to hold records of network addresses that are allowed to log
245: * to us.
246: */
247: struct allowedpeer {
248: int isnumeric;
249: u_short port;
250: union {
251: struct {
252: struct sockaddr_storage addr;
253: struct sockaddr_storage mask;
254: } numeric;
255: char *name;
256: } u;
257: #define a_addr u.numeric.addr
258: #define a_mask u.numeric.mask
259: #define a_name u.name
260: };
261:
262:
263: /*
264: * Intervals at which we flush out "message repeated" messages,
265: * in seconds after previous message is logged. After each flush,
266: * we move to the next interval until we reach the largest.
267: */
268: int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */
269: #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
270: #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount])
271: #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \
272: (f)->f_repeatcount = MAXREPEAT; \
273: }
274:
275: /* values for f_type */
276: #define F_UNUSED 0 /* unused entry */
277: #define F_FILE 1 /* regular file */
278: #define F_TTY 2 /* terminal */
279: #define F_CONSOLE 3 /* console terminal */
280: #define F_FORW 4 /* remote machine */
281: #define F_USERS 5 /* list of users */
282: #define F_WALL 6 /* everyone logged on */
283: #define F_PIPE 7 /* pipe to program */
1.1.2.2 misho 284: #define F_RING 8 /* ring buffer (circular log) */
1.1.2.1 misho 285:
1.1.2.2 misho 286: // CPP:
287: const char *TypeNames[] = {
1.1.2.1 misho 288: "UNUSED", "FILE", "TTY", "CONSOLE",
1.1.2.2 misho 289: "FORW", "USERS", "WALL", "PIPE",
290: "RING"
1.1.2.1 misho 291: };
1.1.2.2 misho 292: // CPP::
1.1.2.1 misho 293:
294: static struct filed *Files; /* Log files that we write to */
295: static struct filed consfile; /* Console */
296:
297: static int Debug; /* debug flag */
298: static int resolve = 1; /* resolve hostname */
299: static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */
300: static const char *LocalDomain; /* our local domain name */
301: static int *finet; /* Internet datagram socket */
302: static int fklog = -1; /* /dev/klog */
303: static int Initialized; /* set when we have initialized ourselves */
304: static int MarkInterval = 20 * 60; /* interval between marks in seconds */
305: static int MarkSeq; /* mark sequence number */
306: static int SecureMode; /* when true, receive only unix domain socks */
307: #ifdef INET6
308: static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
309: #else
310: static int family = PF_INET; /* protocol family (IPv4 only) */
311: #endif
312: static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */
313: static int send_to_all; /* send message to all IPv4/IPv6 addresses */
314: static int use_bootfile; /* log entire bootfile for every kern msg */
315: static int no_compress; /* don't compress messages (1=pipes, 2=all) */
316: static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
317:
318: static char bootfile[MAXLINE+1]; /* booted kernel file */
319:
320: struct allowedpeer *AllowedPeers; /* List of allowed peers */
321: static int NumAllowed; /* Number of entries in AllowedPeers */
322: static int RemoteAddDate; /* Always set the date on remote messages */
323:
324: static int UniquePriority; /* Only log specified priority? */
325: static int LogFacPri; /* Put facility and priority in log message: */
326: /* 0=no, 1=numeric, 2=names */
327: static int KeepKernFac; /* Keep remotely logged kernel facility */
328: static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
329: static struct pidfh *pfh;
330:
331: volatile sig_atomic_t MarkSet, WantDie;
332:
333: static int allowaddr(char *);
334: static void cfline(const char *, struct filed *,
335: const char *, const char *);
336: static const char *cvthname(struct sockaddr *);
337: static void deadq_enter(pid_t, const char *);
338: static int deadq_remove(pid_t);
339: static int decode(const char *, CODE *);
340: static void die(int);
341: static void dodie(int);
342: static void dofsync(void);
343: static void domark(int);
344: static void fprintlog(struct filed *, int, const char *);
345: static int *socksetup(int, char *);
346: static void init(int);
347: static void logerror(const char *);
348: static void logmsg(int, const char *, const char *, int);
349: static void log_deadchild(pid_t, int, const char *);
350: static void markit(void);
351: static int skip_message(const char *, const char *, int);
352: static void printline(const char *, char *, int);
353: static void printsys(char *);
354: static int p_open(const char *, pid_t *);
355: static void readklog(void);
356: static void reapchild(int);
357: static void usage(void);
358: static int validate(struct sockaddr *, const char *);
359: static void unmapped(struct sockaddr *);
360: static void wallmsg(struct filed *, struct iovec *, const int iovlen);
361: static int waitdaemon(int, int, int);
362: static void timedout(int);
363: static void double_rbuf(int);
364:
1.1.2.2 misho 365: // CPP:
366: static const char *
367: ttymsg(struct iovec *iov, int iovcnt, const char *line, int tmout)
368: {
369: struct iovec localiov[7];
370: ssize_t left, wret;
371: int cnt, fd;
372: static char device[MAXNAMLEN] = _PATH_DEV;
373: static char errbuf[1024];
374: char *p;
375: int forked;
376:
377: forked = 0;
378: if (iovcnt > (int)(sizeof(localiov) / sizeof(localiov[0])))
379: return ("too many iov's (change code in wall/ttymsg.c)");
380:
381: p = device + sizeof(_PATH_DEV) - 1;
382: strlcpy(p, line, sizeof(device));
383: if (strncmp(p, "pts/", 4) == 0)
384: p += 4;
385: if (strchr(p, '/') != NULL) {
386: /* A slash is an attempt to break security... */
387: (void) snprintf(errbuf, sizeof(errbuf),
388: "Too many '/' in \"%s\"", device);
389: return (errbuf);
390: }
391:
392: /*
393: * open will fail on slip lines or exclusive-use lines
394: * if not running as root; not an error.
395: */
396: if ((fd = open(device, O_WRONLY|O_NONBLOCK, 0)) < 0) {
397: if (errno == EBUSY || errno == EACCES)
398: return (NULL);
399: (void) snprintf(errbuf, sizeof(errbuf), "%s: %s", device,
400: strerror(errno));
401: return (errbuf);
402: }
403:
404: for (cnt = 0, left = 0; cnt < iovcnt; ++cnt)
405: left += iov[cnt].iov_len;
406:
407: for (;;) {
408: wret = writev(fd, iov, iovcnt);
409: if (wret >= left)
410: break;
411: if (wret >= 0) {
412: left -= wret;
413: if (iov != localiov) {
414: bcopy(iov, localiov,
415: iovcnt * sizeof(struct iovec));
416: iov = localiov;
417: }
418: for (cnt = 0; (size_t)wret >= iov->iov_len; ++cnt) {
419: wret -= iov->iov_len;
420: ++iov;
421: --iovcnt;
422: }
423: if (wret) {
424: iov->iov_base = (char *)iov->iov_base + wret;
425: iov->iov_len -= wret;
426: }
427: continue;
428: }
429: if (errno == EWOULDBLOCK) {
430: int cpid;
431:
432: if (forked) {
433: (void) close(fd);
434: _exit(1);
435: }
436: cpid = fork();
437: if (cpid < 0) {
438: (void) snprintf(errbuf, sizeof(errbuf),
439: "fork: %s", strerror(errno));
440: (void) close(fd);
441: return (errbuf);
442: }
443: if (cpid) { /* parent */
444: (void) close(fd);
445: return (NULL);
446: }
447: forked++;
448: /* wait at most tmout seconds */
449: (void) signal(SIGALRM, SIG_DFL);
450: (void) signal(SIGTERM, SIG_DFL); /* XXX */
451: (void) sigsetmask(0);
452: (void) alarm((u_int)tmout);
453: (void) fcntl(fd, F_SETFL, 0); /* clear O_NONBLOCK */
454: continue;
455: }
456: /*
457: * We get ENODEV on a slip line if we're running as root,
458: * and EIO if the line just went away.
459: */
460: if (errno == ENODEV || errno == EIO)
461: break;
462: (void) close(fd);
463: if (forked)
464: _exit(1);
465: (void) snprintf(errbuf, sizeof(errbuf),
466: "%s: %s", device, strerror(errno));
467: return (errbuf);
468: }
469:
470: (void) close(fd);
471: if (forked)
472: _exit(0);
473: return (NULL);
474: }
475:
476: static ssize_t
477: rbwrite(struct filed *f, char *buf, size_t nbytes)
478: {
479: ssize_t err, out = 0;
480: size_t maxwrite = f->f_un.f_ring.f_footer->cf_max - f->f_un.f_ring.f_footer->cf_next;
481:
482: f->f_un.f_ring.f_footer->cf_lock = 1;
483: while (nbytes > 0) {
484: maxwrite = f->f_un.f_ring.f_footer->cf_max - f->f_un.f_ring.f_footer->cf_next;
485: if (maxwrite > nbytes)
486: maxwrite = nbytes;
487: err = pwrite(f->f_file, buf, maxwrite, f->f_un.f_ring.f_footer->cf_next);
488: if (err == -1) {
489: f->f_un.f_ring.f_footer->cf_lock = 0;
490: return -1;
491: }
492: nbytes -= err;
493: out += err;
494: buf += err;
495: f->f_un.f_ring.f_footer->cf_next += err;
496: if (f->f_un.f_ring.f_footer->cf_next == f->f_un.f_ring.f_footer->cf_max) {
497: f->f_un.f_ring.f_footer->cf_next = 0;
498: f->f_un.f_ring.f_footer->cf_wrap = 1;
499: }
500: }
501:
502: f->f_un.f_ring.f_footer->cf_lock = 0;
503: return out;
504: }
505: static ssize_t
506: rbwritev(struct filed *f, struct iovec *iov, int iovcnt)
507: {
508: register int i;
509: ssize_t err, out = 0;
510:
511: for(i = 0; i < iovcnt; i++) {
512: err = rbwrite(f, iov[i].iov_base, iov[i].iov_len);
513: if (err == -1)
514: return -1;
515: out += err;
516: }
517:
518: return out;
519: }
520: // CPP::
521:
1.1.2.1 misho 522: int
523: main(int argc, char *argv[])
524: {
525: int ch, i, fdsrmax = 0, l;
526: struct sockaddr_un sunx, fromunix;
527: struct sockaddr_storage frominet;
528: fd_set *fdsr = NULL;
529: char line[MAXLINE + 1];
530: char *bindhostname;
531: const char *hname;
532: struct timeval tv, *tvp;
533: struct sigaction sact;
534: struct funix *fx, *fx1;
535: sigset_t mask;
536: pid_t ppid = 1, spid;
537: socklen_t len;
538:
539: if (madvise(NULL, 0, MADV_PROTECT) != 0)
540: dprintf("madvise() failed: %s\n", strerror(errno));
541:
542: bindhostname = NULL;
543: while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nop:P:sS:Tuv"))
544: != -1)
545: switch (ch) {
546: case '4':
547: family = PF_INET;
548: break;
549: #ifdef INET6
550: case '6':
551: family = PF_INET6;
552: break;
553: #endif
554: case '8':
555: mask_C1 = 0;
556: break;
557: case 'A':
558: send_to_all++;
559: break;
560: case 'a': /* allow specific network addresses only */
561: if (allowaddr(optarg) == -1)
562: usage();
563: break;
564: case 'b':
565: bindhostname = optarg;
566: break;
567: case 'c':
568: no_compress++;
569: break;
570: case 'C':
571: logflags |= O_CREAT;
572: break;
573: case 'd': /* debug */
574: Debug++;
575: break;
576: case 'f': /* configuration file */
577: ConfFile = optarg;
578: break;
579: case 'k': /* keep remote kern fac */
580: KeepKernFac = 1;
581: break;
582: case 'l':
583: {
584: long perml;
585: mode_t mode;
586: char *name, *ep;
587:
588: if (optarg[0] == '/') {
589: mode = DEFFILEMODE;
590: name = optarg;
591: } else if ((name = strchr(optarg, ':')) != NULL) {
592: *name++ = '\0';
593: if (name[0] != '/')
594: errx(1, "socket name must be absolute "
595: "path");
596: if (isdigit(*optarg)) {
597: perml = strtol(optarg, &ep, 8);
598: if (*ep || perml < 0 ||
599: perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
600: errx(1, "invalid mode %s, exiting",
601: optarg);
602: mode = (mode_t )perml;
603: } else
604: errx(1, "invalid mode %s, exiting",
605: optarg);
606: } else /* doesn't begin with '/', and no ':' */
607: errx(1, "can't parse path %s", optarg);
608:
609: if (strlen(name) >= sizeof(sunx.sun_path))
610: errx(1, "%s path too long, exiting", name);
611: if ((fx = malloc(sizeof(struct funix))) == NULL)
612: errx(1, "malloc failed");
613: fx->s = -1;
614: fx->name = name;
615: fx->mode = mode;
616: STAILQ_INSERT_TAIL(&funixes, fx, next);
617: break;
618: }
619: case 'm': /* mark interval */
620: MarkInterval = atoi(optarg) * 60;
621: break;
622: case 'n':
623: resolve = 0;
624: break;
625: case 'o':
626: use_bootfile = 1;
627: break;
628: case 'p': /* path */
629: if (strlen(optarg) >= sizeof(sunx.sun_path))
630: errx(1, "%s path too long, exiting", optarg);
631: funix_default.name = optarg;
632: break;
633: case 'P': /* path for alt. PID */
634: PidFile = optarg;
635: break;
636: case 's': /* no network mode */
637: SecureMode++;
638: break;
639: case 'S': /* path for privileged originator */
640: if (strlen(optarg) >= sizeof(sunx.sun_path))
641: errx(1, "%s path too long, exiting", optarg);
642: funix_secure.name = optarg;
643: break;
644: case 'T':
645: RemoteAddDate = 1;
646: break;
647: case 'u': /* only log specified priority */
648: UniquePriority++;
649: break;
650: case 'v': /* log facility and priority */
651: LogFacPri++;
652: break;
653: default:
654: usage();
655: }
656: if ((argc -= optind) != 0)
657: usage();
658:
659: pfh = pidfile_open(PidFile, 0600, &spid);
660: if (pfh == NULL) {
661: if (errno == EEXIST)
662: errx(1, "syslogd already running, pid: %d", spid);
663: warn("cannot open pid file");
664: }
665:
666: if (!Debug) {
667: ppid = waitdaemon(0, 0, 30);
668: if (ppid < 0) {
669: warn("could not become daemon");
670: pidfile_remove(pfh);
671: exit(1);
672: }
673: } else {
674: setlinebuf(stdout);
675: }
676:
677: if (NumAllowed)
678: endservent();
679:
680: consfile.f_type = F_CONSOLE;
681: (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
682: sizeof(consfile.f_un.f_fname));
683: (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
684: (void)signal(SIGTERM, dodie);
685: (void)signal(SIGINT, Debug ? dodie : SIG_IGN);
686: (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
687: /*
688: * We don't want the SIGCHLD and SIGHUP handlers to interfere
689: * with each other; they are likely candidates for being called
690: * simultaneously (SIGHUP closes pipe descriptor, process dies,
691: * SIGCHLD happens).
692: */
693: sigemptyset(&mask);
694: sigaddset(&mask, SIGHUP);
695: sact.sa_handler = reapchild;
696: sact.sa_mask = mask;
697: sact.sa_flags = SA_RESTART;
698: (void)sigaction(SIGCHLD, &sact, NULL);
699: (void)signal(SIGALRM, domark);
700: (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */
701: (void)alarm(TIMERINTVL);
702:
703: TAILQ_INIT(&deadq_head);
704:
705: #ifndef SUN_LEN
706: #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
707: #endif
708: STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) {
709: (void)unlink(fx->name);
710: memset(&sunx, 0, sizeof(sunx));
711: sunx.sun_family = AF_LOCAL;
712: (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path));
713: fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0);
714: if (fx->s < 0 ||
715: bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
716: chmod(fx->name, fx->mode) < 0) {
717: (void)snprintf(line, sizeof line,
718: "cannot create %s", fx->name);
719: logerror(line);
720: dprintf("cannot create %s (%d)\n", fx->name, errno);
721: if (fx == &funix_default || fx == &funix_secure)
722: die(0);
723: else {
724: STAILQ_REMOVE(&funixes, fx, funix, next);
725: continue;
726: }
727: double_rbuf(fx->s);
728: }
729: }
730: if (SecureMode <= 1)
731: finet = socksetup(family, bindhostname);
732:
733: if (finet) {
734: if (SecureMode) {
735: for (i = 0; i < *finet; i++) {
736: if (shutdown(finet[i+1], SHUT_RD) < 0) {
737: logerror("shutdown");
738: if (!Debug)
739: die(0);
740: }
741: }
742: } else {
743: dprintf("listening on inet and/or inet6 socket\n");
744: }
745: dprintf("sending on inet and/or inet6 socket\n");
746: }
747:
748: if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
749: if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
750: fklog = -1;
751: if (fklog < 0)
752: dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
753:
754: /* tuck my process id away */
755: pidfile_write(pfh);
756:
757: dprintf("off & running....\n");
758:
759: init(0);
760: /* prevent SIGHUP and SIGCHLD handlers from running in parallel */
761: sigemptyset(&mask);
762: sigaddset(&mask, SIGCHLD);
763: sact.sa_handler = init;
764: sact.sa_mask = mask;
765: sact.sa_flags = SA_RESTART;
766: (void)sigaction(SIGHUP, &sact, NULL);
767:
768: tvp = &tv;
769: tv.tv_sec = tv.tv_usec = 0;
770:
771: if (fklog != -1 && fklog > fdsrmax)
772: fdsrmax = fklog;
773: if (finet && !SecureMode) {
774: for (i = 0; i < *finet; i++) {
775: if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
776: fdsrmax = finet[i+1];
777: }
778: }
779: STAILQ_FOREACH(fx, &funixes, next)
780: if (fx->s > fdsrmax)
781: fdsrmax = fx->s;
782:
783: fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
784: sizeof(fd_mask));
785: if (fdsr == NULL)
786: errx(1, "calloc fd_set");
787:
788: for (;;) {
789: if (MarkSet)
790: markit();
791: if (WantDie)
792: die(WantDie);
793:
794: bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
795: sizeof(fd_mask));
796:
797: if (fklog != -1)
798: FD_SET(fklog, fdsr);
799: if (finet && !SecureMode) {
800: for (i = 0; i < *finet; i++) {
801: if (finet[i+1] != -1)
802: FD_SET(finet[i+1], fdsr);
803: }
804: }
805: STAILQ_FOREACH(fx, &funixes, next)
806: FD_SET(fx->s, fdsr);
807:
808: i = select(fdsrmax+1, fdsr, NULL, NULL,
809: needdofsync ? &tv : tvp);
810: switch (i) {
811: case 0:
812: dofsync();
813: needdofsync = 0;
814: if (tvp) {
815: tvp = NULL;
816: if (ppid != 1)
817: kill(ppid, SIGALRM);
818: }
819: continue;
820: case -1:
821: if (errno != EINTR)
822: logerror("select");
823: continue;
824: }
825: if (fklog != -1 && FD_ISSET(fklog, fdsr))
826: readklog();
827: if (finet && !SecureMode) {
828: for (i = 0; i < *finet; i++) {
829: if (FD_ISSET(finet[i+1], fdsr)) {
830: len = sizeof(frominet);
831: l = recvfrom(finet[i+1], line, MAXLINE,
832: 0, (struct sockaddr *)&frominet,
833: &len);
834: if (l > 0) {
835: line[l] = '\0';
836: hname = cvthname((struct sockaddr *)&frominet);
837: unmapped((struct sockaddr *)&frominet);
838: if (validate((struct sockaddr *)&frominet, hname))
839: printline(hname, line, RemoteAddDate ? ADDDATE : 0);
840: } else if (l < 0 && errno != EINTR)
841: logerror("recvfrom inet");
842: }
843: }
844: }
845: STAILQ_FOREACH(fx, &funixes, next) {
846: if (FD_ISSET(fx->s, fdsr)) {
847: len = sizeof(fromunix);
848: l = recvfrom(fx->s, line, MAXLINE, 0,
849: (struct sockaddr *)&fromunix, &len);
850: if (l > 0) {
851: line[l] = '\0';
852: printline(LocalHostName, line, 0);
853: } else if (l < 0 && errno != EINTR)
854: logerror("recvfrom unix");
855: }
856: }
857: }
858: if (fdsr)
859: free(fdsr);
860: }
861:
862: static void
863: unmapped(struct sockaddr *sa)
864: {
865: struct sockaddr_in6 *sin6;
866: struct sockaddr_in sin4;
867:
868: if (sa->sa_family != AF_INET6)
869: return;
870: if (sa->sa_len != sizeof(struct sockaddr_in6) ||
871: sizeof(sin4) > sa->sa_len)
872: return;
873: sin6 = (struct sockaddr_in6 *)sa;
874: if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
875: return;
876:
877: memset(&sin4, 0, sizeof(sin4));
878: sin4.sin_family = AF_INET;
879: sin4.sin_len = sizeof(struct sockaddr_in);
880: memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
881: sizeof(sin4.sin_addr));
882: sin4.sin_port = sin6->sin6_port;
883:
884: memcpy(sa, &sin4, sin4.sin_len);
885: }
886:
887: static void
888: usage(void)
889: {
890:
891: fprintf(stderr, "%s\n%s\n%s\n%s\n",
892: "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]",
893: " [-b bind_address] [-f config_file]",
894: " [-l [mode:]path] [-m mark_interval]",
895: " [-P pid_file] [-p log_socket]");
896: exit(1);
897: }
898:
899: /*
900: * Take a raw input line, decode the message, and print the message
901: * on the appropriate log files.
902: */
903: static void
904: printline(const char *hname, char *msg, int flags)
905: {
906: char *p, *q;
907: long n;
908: int c, pri;
909: char line[MAXLINE + 1];
910:
911: /* test for special codes */
912: p = msg;
913: pri = DEFUPRI;
914: if (*p == '<') {
915: errno = 0;
916: n = strtol(p + 1, &q, 10);
917: if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
918: p = q + 1;
919: pri = n;
920: }
921: }
922: if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
923: pri = DEFUPRI;
924:
925: /*
926: * Don't allow users to log kernel messages.
927: * NOTE: since LOG_KERN == 0 this will also match
928: * messages with no facility specified.
929: */
930: if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
931: pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
932:
933: q = line;
934:
935: while ((c = (unsigned char)*p++) != '\0' &&
936: q < &line[sizeof(line) - 4]) {
937: if (mask_C1 && (c & 0x80) && c < 0xA0) {
938: c &= 0x7F;
939: *q++ = 'M';
940: *q++ = '-';
941: }
942: if (isascii(c) && iscntrl(c)) {
943: if (c == '\n') {
944: *q++ = ' ';
945: } else if (c == '\t') {
946: *q++ = '\t';
947: } else {
948: *q++ = '^';
949: *q++ = c ^ 0100;
950: }
951: } else {
952: *q++ = c;
953: }
954: }
955: *q = '\0';
956:
957: logmsg(pri, line, hname, flags);
958: }
959:
960: /*
961: * Read /dev/klog while data are available, split into lines.
962: */
963: static void
964: readklog(void)
965: {
966: char *p, *q, line[MAXLINE + 1];
967: int len, i;
968:
969: len = 0;
970: for (;;) {
971: i = read(fklog, line + len, MAXLINE - 1 - len);
972: if (i > 0) {
973: line[i + len] = '\0';
974: } else {
975: if (i < 0 && errno != EINTR && errno != EAGAIN) {
976: logerror("klog");
977: fklog = -1;
978: }
979: break;
980: }
981:
982: for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
983: *q = '\0';
984: printsys(p);
985: }
986: len = strlen(p);
987: if (len >= MAXLINE - 1) {
988: printsys(p);
989: len = 0;
990: }
991: if (len > 0)
992: memmove(line, p, len + 1);
993: }
994: if (len > 0)
995: printsys(line);
996: }
997:
998: /*
999: * Take a raw input line from /dev/klog, format similar to syslog().
1000: */
1001: static void
1002: printsys(char *msg)
1003: {
1004: char *p, *q;
1005: long n;
1006: int flags, isprintf, pri;
1007:
1008: flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */
1009: p = msg;
1010: pri = DEFSPRI;
1011: isprintf = 1;
1012: if (*p == '<') {
1013: errno = 0;
1014: n = strtol(p + 1, &q, 10);
1015: if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
1016: p = q + 1;
1017: pri = n;
1018: isprintf = 0;
1019: }
1020: }
1021: /*
1022: * Kernel printf's and LOG_CONSOLE messages have been displayed
1023: * on the console already.
1024: */
1025: if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
1026: flags |= IGN_CONS;
1027: if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
1028: pri = DEFSPRI;
1029: logmsg(pri, p, LocalHostName, flags);
1030: }
1031:
1032: static time_t now;
1033:
1034: /*
1035: * Match a program or host name against a specification.
1036: * Return a non-0 value if the message must be ignored
1037: * based on the specification.
1038: */
1039: static int
1040: skip_message(const char *name, const char *spec, int checkcase)
1041: {
1042: const char *s;
1043: char prev, next;
1044: int exclude = 0;
1045: /* Behaviour on explicit match */
1046:
1047: if (spec == NULL)
1048: return 0;
1049: switch (*spec) {
1050: case '-':
1051: exclude = 1;
1052: /*FALLTHROUGH*/
1053: case '+':
1054: spec++;
1055: break;
1056: default:
1057: break;
1058: }
1059: if (checkcase)
1060: s = strstr (spec, name);
1061: else
1062: s = strcasestr (spec, name);
1063:
1064: if (s != NULL) {
1065: prev = (s == spec ? ',' : *(s - 1));
1066: next = *(s + strlen (name));
1067:
1068: if (prev == ',' && (next == '\0' || next == ','))
1069: /* Explicit match: skip iff the spec is an
1070: exclusive one. */
1071: return exclude;
1072: }
1073:
1074: /* No explicit match for this name: skip the message iff
1075: the spec is an inclusive one. */
1076: return !exclude;
1077: }
1078:
1079: /*
1080: * Log a message to the appropriate log files, users, etc. based on
1081: * the priority.
1082: */
1083: static void
1084: logmsg(int pri, const char *msg, const char *from, int flags)
1085: {
1086: struct filed *f;
1087: int i, fac, msglen, omask, prilev;
1088: const char *timestamp;
1089: char prog[NAME_MAX+1];
1090: char buf[MAXLINE+1];
1091:
1092: dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
1093: pri, flags, from, msg);
1094:
1095: omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
1096:
1097: /*
1098: * Check to see if msg looks non-standard.
1099: */
1100: msglen = strlen(msg);
1101: if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
1102: msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
1103: flags |= ADDDATE;
1104:
1105: (void)time(&now);
1106: if (flags & ADDDATE) {
1107: timestamp = ctime(&now) + 4;
1108: } else {
1109: timestamp = msg;
1110: msg += 16;
1111: msglen -= 16;
1112: }
1113:
1114: /* skip leading blanks */
1115: while (isspace(*msg)) {
1116: msg++;
1117: msglen--;
1118: }
1119:
1120: /* extract facility and priority level */
1121: if (flags & MARK)
1122: fac = LOG_NFACILITIES;
1123: else
1124: fac = LOG_FAC(pri);
1125:
1126: /* Check maximum facility number. */
1127: if (fac > LOG_NFACILITIES) {
1128: (void)sigsetmask(omask);
1129: return;
1130: }
1131:
1132: prilev = LOG_PRI(pri);
1133:
1134: /* extract program name */
1135: for (i = 0; i < NAME_MAX; i++) {
1136: if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
1137: msg[i] == '/' || isspace(msg[i]))
1138: break;
1139: prog[i] = msg[i];
1140: }
1141: prog[i] = 0;
1142:
1143: /* add kernel prefix for kernel messages */
1144: if (flags & ISKERNEL) {
1145: snprintf(buf, sizeof(buf), "%s: %s",
1146: use_bootfile ? bootfile : "kernel", msg);
1147: msg = buf;
1148: msglen = strlen(buf);
1149: }
1150:
1151: /* log the message to the particular outputs */
1152: if (!Initialized) {
1153: f = &consfile;
1154: /*
1155: * Open in non-blocking mode to avoid hangs during open
1156: * and close(waiting for the port to drain).
1157: */
1158: f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
1159:
1160: if (f->f_file >= 0) {
1161: (void)strlcpy(f->f_lasttime, timestamp,
1162: sizeof(f->f_lasttime));
1163: fprintlog(f, flags, msg);
1164: (void)close(f->f_file);
1165: }
1166: (void)sigsetmask(omask);
1167: return;
1168: }
1169: for (f = Files; f; f = f->f_next) {
1170: /* skip messages that are incorrect priority */
1171: if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
1172: ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
1173: ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
1174: )
1175: || f->f_pmask[fac] == INTERNAL_NOPRI)
1176: continue;
1177:
1178: /* skip messages with the incorrect hostname */
1179: if (skip_message(from, f->f_host, 0))
1180: continue;
1181:
1182: /* skip messages with the incorrect program name */
1183: if (skip_message(prog, f->f_program, 1))
1184: continue;
1185:
1186: /* skip message to console if it has already been printed */
1187: if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1188: continue;
1189:
1190: /* don't output marks to recently written files */
1191: if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1192: continue;
1193:
1194: /*
1195: * suppress duplicate lines to this file
1196: */
1197: if (no_compress - (f->f_type != F_PIPE) < 1 &&
1198: (flags & MARK) == 0 && msglen == f->f_prevlen &&
1199: f->f_prevline && !strcmp(msg, f->f_prevline) &&
1200: !strcasecmp(from, f->f_prevhost)) {
1201: (void)strlcpy(f->f_lasttime, timestamp,
1202: sizeof(f->f_lasttime));
1203: f->f_prevcount++;
1204: dprintf("msg repeated %d times, %ld sec of %d\n",
1205: f->f_prevcount, (long)(now - f->f_time),
1206: repeatinterval[f->f_repeatcount]);
1207: /*
1208: * If domark would have logged this by now,
1209: * flush it now (so we don't hold isolated messages),
1210: * but back off so we'll flush less often
1211: * in the future.
1212: */
1213: if (now > REPEATTIME(f)) {
1214: fprintlog(f, flags, (char *)NULL);
1215: BACKOFF(f);
1216: }
1217: } else {
1218: /* new line, save it */
1219: if (f->f_prevcount)
1220: fprintlog(f, 0, (char *)NULL);
1221: f->f_repeatcount = 0;
1222: f->f_prevpri = pri;
1223: (void)strlcpy(f->f_lasttime, timestamp,
1224: sizeof(f->f_lasttime));
1225: (void)strlcpy(f->f_prevhost, from,
1226: sizeof(f->f_prevhost));
1227: if (msglen < MAXSVLINE) {
1228: f->f_prevlen = msglen;
1229: (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
1230: fprintlog(f, flags, (char *)NULL);
1231: } else {
1232: f->f_prevline[0] = 0;
1233: f->f_prevlen = 0;
1234: fprintlog(f, flags, msg);
1235: }
1236: }
1237: }
1238: (void)sigsetmask(omask);
1239: }
1240:
1241: static void
1242: dofsync(void)
1243: {
1244: struct filed *f;
1245:
1246: for (f = Files; f; f = f->f_next) {
1247: if ((f->f_type == F_FILE) &&
1248: (f->f_flags & FFLAG_NEEDSYNC)) {
1249: f->f_flags &= ~FFLAG_NEEDSYNC;
1250: (void)fsync(f->f_file);
1251: }
1252: }
1253: }
1254:
1255: #define IOV_SIZE 7
1256: static void
1257: fprintlog(struct filed *f, int flags, const char *msg)
1258: {
1259: struct iovec iov[IOV_SIZE];
1260: struct iovec *v;
1261: struct addrinfo *r;
1262: int i, l, lsent = 0;
1263: char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
1264: char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
1265: const char *msgret;
1266:
1267: v = iov;
1268: if (f->f_type == F_WALL) {
1269: v->iov_base = greetings;
1270: /* The time displayed is not synchornized with the other log
1271: * destinations (like messages). Following fragment was using
1272: * ctime(&now), which was updating the time every 30 sec.
1273: * With f_lasttime, time is synchronized correctly.
1274: */
1275: v->iov_len = snprintf(greetings, sizeof greetings,
1276: "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
1277: f->f_prevhost, f->f_lasttime);
1278: if (v->iov_len > 0)
1279: v++;
1280: v->iov_base = nul;
1281: v->iov_len = 0;
1282: v++;
1283: } else {
1284: v->iov_base = f->f_lasttime;
1285: v->iov_len = strlen(f->f_lasttime);
1286: v++;
1287: v->iov_base = space;
1288: v->iov_len = 1;
1289: v++;
1290: }
1291:
1292: if (LogFacPri) {
1293: static char fp_buf[30]; /* Hollow laugh */
1294: int fac = f->f_prevpri & LOG_FACMASK;
1295: int pri = LOG_PRI(f->f_prevpri);
1296: const char *f_s = NULL;
1297: char f_n[5]; /* Hollow laugh */
1298: const char *p_s = NULL;
1299: char p_n[5]; /* Hollow laugh */
1300:
1301: if (LogFacPri > 1) {
1302: CODE *c;
1303:
1304: for (c = facilitynames; c->c_name; c++) {
1305: if (c->c_val == fac) {
1306: f_s = c->c_name;
1307: break;
1308: }
1309: }
1310: for (c = prioritynames; c->c_name; c++) {
1311: if (c->c_val == pri) {
1312: p_s = c->c_name;
1313: break;
1314: }
1315: }
1316: }
1317: if (!f_s) {
1318: snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1319: f_s = f_n;
1320: }
1321: if (!p_s) {
1322: snprintf(p_n, sizeof p_n, "%d", pri);
1323: p_s = p_n;
1324: }
1325: snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
1326: v->iov_base = fp_buf;
1327: v->iov_len = strlen(fp_buf);
1328: } else {
1329: v->iov_base = nul;
1330: v->iov_len = 0;
1331: }
1332: v++;
1333:
1334: v->iov_base = f->f_prevhost;
1335: v->iov_len = strlen(v->iov_base);
1336: v++;
1337: v->iov_base = space;
1338: v->iov_len = 1;
1339: v++;
1340:
1341: if (msg) {
1342: wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1343: if (wmsg == NULL) {
1344: logerror("strdup");
1345: exit(1);
1346: }
1347: v->iov_base = wmsg;
1348: v->iov_len = strlen(msg);
1349: } else if (f->f_prevcount > 1) {
1350: v->iov_base = repbuf;
1351: v->iov_len = snprintf(repbuf, sizeof repbuf,
1352: "last message repeated %d times", f->f_prevcount);
1353: } else if (f->f_prevline) {
1354: v->iov_base = f->f_prevline;
1355: v->iov_len = f->f_prevlen;
1356: } else {
1357: return;
1358: }
1359: v++;
1360:
1361: dprintf("Logging to %s", TypeNames[f->f_type]);
1362: f->f_time = now;
1363:
1364: switch (f->f_type) {
1365: int port;
1366: case F_UNUSED:
1367: dprintf("\n");
1368: break;
1369:
1370: case F_FORW:
1371: port = (int)ntohs(((struct sockaddr_in *)
1372: (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1373: if (port != 514) {
1374: dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port);
1375: } else {
1376: dprintf(" %s\n", f->f_un.f_forw.f_hname);
1377: }
1378: /* check for local vs remote messages */
1379: if (strcasecmp(f->f_prevhost, LocalHostName))
1380: l = snprintf(line, sizeof line - 1,
1381: "<%d>%.15s Forwarded from %s: %s",
1382: f->f_prevpri, (char *)iov[0].iov_base,
1383: f->f_prevhost, (char *)iov[5].iov_base);
1384: else
1385: l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1386: f->f_prevpri, (char *)iov[0].iov_base,
1387: (char *)iov[5].iov_base);
1388: if (l < 0)
1389: l = 0;
1390: else if (l > MAXLINE)
1391: l = MAXLINE;
1392:
1393: if (finet) {
1394: for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1395: for (i = 0; i < *finet; i++) {
1396: #if 0
1397: /*
1398: * should we check AF first, or just
1399: * trial and error? FWD
1400: */
1401: if (r->ai_family ==
1402: address_family_of(finet[i+1]))
1403: #endif
1404: lsent = sendto(finet[i+1], line, l, 0,
1405: r->ai_addr, r->ai_addrlen);
1406: if (lsent == l)
1407: break;
1408: }
1409: if (lsent == l && !send_to_all)
1410: break;
1411: }
1412: dprintf("lsent/l: %d/%d\n", lsent, l);
1413: if (lsent != l) {
1414: int e = errno;
1415: logerror("sendto");
1416: errno = e;
1417: switch (errno) {
1418: case ENOBUFS:
1419: case ENETDOWN:
1420: case EHOSTUNREACH:
1421: case EHOSTDOWN:
1422: break;
1423: /* case EBADF: */
1424: /* case EACCES: */
1425: /* case ENOTSOCK: */
1426: /* case EFAULT: */
1427: /* case EMSGSIZE: */
1428: /* case EAGAIN: */
1429: /* case ENOBUFS: */
1430: /* case ECONNREFUSED: */
1431: default:
1432: dprintf("removing entry\n");
1433: f->f_type = F_UNUSED;
1434: break;
1435: }
1436: }
1437: }
1438: break;
1439:
1440: case F_FILE:
1441: dprintf(" %s\n", f->f_un.f_fname);
1442: v->iov_base = lf;
1443: v->iov_len = 1;
1444: if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1445: /*
1446: * If writev(2) fails for potentially transient errors
1447: * like the filesystem being full, ignore it.
1448: * Otherwise remove this logfile from the list.
1449: */
1450: if (errno != ENOSPC) {
1451: int e = errno;
1452: (void)close(f->f_file);
1453: f->f_type = F_UNUSED;
1454: errno = e;
1455: logerror(f->f_un.f_fname);
1456: }
1457: } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1458: f->f_flags |= FFLAG_NEEDSYNC;
1459: needdofsync = 1;
1460: }
1461: break;
1462:
1.1.2.2 misho 1463: // CPP:
1464: case F_RING:
1465: dprintf(" %s\n", f->f_un.f_ring.f_rname);
1466: v->iov_base = "\n";
1467: v->iov_len = 1;
1468: if (rbwritev(f, iov, 7) == -1) {
1469: int e = errno;
1470:
1471: munmap(f->f_un.f_ring.f_footer, sizeof(struct clogFooter));
1472: close(f->f_file);
1473: f->f_type = F_UNUSED;
1474: errno = e;
1475: logerror(f->f_un.f_fname);
1476: }
1477: break;
1478: // CPP::
1479:
1.1.2.1 misho 1480: case F_PIPE:
1481: dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1482: v->iov_base = lf;
1483: v->iov_len = 1;
1484: if (f->f_un.f_pipe.f_pid == 0) {
1485: if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1486: &f->f_un.f_pipe.f_pid)) < 0) {
1487: f->f_type = F_UNUSED;
1488: logerror(f->f_un.f_pipe.f_pname);
1489: break;
1490: }
1491: }
1492: if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1493: int e = errno;
1494: (void)close(f->f_file);
1495: if (f->f_un.f_pipe.f_pid > 0)
1496: deadq_enter(f->f_un.f_pipe.f_pid,
1497: f->f_un.f_pipe.f_pname);
1498: f->f_un.f_pipe.f_pid = 0;
1499: errno = e;
1500: logerror(f->f_un.f_pipe.f_pname);
1501: }
1502: break;
1503:
1504: case F_CONSOLE:
1505: if (flags & IGN_CONS) {
1506: dprintf(" (ignored)\n");
1507: break;
1508: }
1509: /* FALLTHROUGH */
1510:
1511: case F_TTY:
1512: dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1513: v->iov_base = crlf;
1514: v->iov_len = 2;
1515:
1516: errno = 0; /* ttymsg() only sometimes returns an errno */
1517: if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) {
1518: f->f_type = F_UNUSED;
1519: logerror(msgret);
1520: }
1521: break;
1522:
1523: case F_USERS:
1524: case F_WALL:
1525: dprintf("\n");
1526: v->iov_base = crlf;
1527: v->iov_len = 2;
1528: wallmsg(f, iov, IOV_SIZE);
1529: break;
1530: }
1531: f->f_prevcount = 0;
1532: free(wmsg);
1533: }
1534:
1535: /*
1536: * WALLMSG -- Write a message to the world at large
1537: *
1538: * Write the specified message to either the entire
1539: * world, or a list of approved users.
1540: */
1541: static void
1542: wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1543: {
1544: static int reenter; /* avoid calling ourselves */
1545: int i;
1546: const char *p;
1547:
1548: if (reenter++)
1549: return;
1.1.2.4 misho 1550: #if defined(__FreeBSD__) && (__FreeBSD__ > 8)
1551: struct utmpx *ut;
1552:
1.1.2.1 misho 1553: setutxent();
1554: /* NOSTRICT */
1555: while ((ut = getutxent()) != NULL) {
1556: if (ut->ut_type != USER_PROCESS)
1557: continue;
1.1.2.4 misho 1558: #else
1559: struct utmp ut_, *ut = &ut_;
1560: FILE *uf;
1561: char line[sizeof(ut_.ut_line) + 1];
1562:
1563: if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1564: logerror(_PATH_UTMP);
1565: reenter = 0;
1566: return;
1567: }
1568: /* NOSTRICT */
1569: while (fread((char *)ut, sizeof(ut_), 1, uf) == 1) {
1570: if (ut->ut_name[0] == '\0')
1571: continue;
1572: /* We must use strncpy since ut_* may not be NUL terminated. */
1573: strncpy(line, ut->ut_line, sizeof(line) - 1);
1574: line[sizeof(line) - 1] = '\0';
1575: #endif
1.1.2.1 misho 1576: if (f->f_type == F_WALL) {
1577: if ((p = ttymsg(iov, iovlen, ut->ut_line,
1578: TTYMSGTIME)) != NULL) {
1579: errno = 0; /* already in msg */
1580: logerror(p);
1581: }
1582: continue;
1583: }
1584: /* should we send the message to this user? */
1585: for (i = 0; i < MAXUNAMES; i++) {
1586: if (!f->f_un.f_uname[i][0])
1587: break;
1.1.2.4 misho 1588: #if defined(__FreeBSD__) && (__FreeBSD__ > 8)
1.1.2.1 misho 1589: if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) {
1.1.2.4 misho 1590: #else
1591: if (!strncmp(f->f_un.f_uname[i], ut->ut_name, UT_NAMESIZE)) {
1592: #endif
1.1.2.1 misho 1593: if ((p = ttymsg(iov, iovlen, ut->ut_line,
1594: TTYMSGTIME)) != NULL) {
1595: errno = 0; /* already in msg */
1596: logerror(p);
1597: }
1598: break;
1599: }
1600: }
1601: }
1.1.2.4 misho 1602: #if defined(__FreeBSD__) && (__FreeBSD__ > 8)
1.1.2.1 misho 1603: endutxent();
1.1.2.4 misho 1604: #else
1605: fclose(uf);
1606: #endif
1.1.2.1 misho 1607: reenter = 0;
1608: }
1609:
1610: static void
1611: reapchild(int signo __unused)
1612: {
1613: int status;
1614: pid_t pid;
1615: struct filed *f;
1616:
1617: while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1618: if (!Initialized)
1619: /* Don't tell while we are initting. */
1620: continue;
1621:
1622: /* First, look if it's a process from the dead queue. */
1623: if (deadq_remove(pid))
1624: goto oncemore;
1625:
1626: /* Now, look in list of active processes. */
1627: for (f = Files; f; f = f->f_next)
1628: if (f->f_type == F_PIPE &&
1629: f->f_un.f_pipe.f_pid == pid) {
1630: (void)close(f->f_file);
1631: f->f_un.f_pipe.f_pid = 0;
1632: log_deadchild(pid, status,
1633: f->f_un.f_pipe.f_pname);
1634: break;
1635: }
1636: oncemore:
1637: continue;
1638: }
1639: }
1640:
1641: /*
1642: * Return a printable representation of a host address.
1643: */
1644: static const char *
1645: cvthname(struct sockaddr *f)
1646: {
1647: int error, hl;
1648: sigset_t omask, nmask;
1649: static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1650:
1651: error = getnameinfo((struct sockaddr *)f,
1652: ((struct sockaddr *)f)->sa_len,
1653: ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
1654: dprintf("cvthname(%s)\n", ip);
1655:
1656: if (error) {
1657: dprintf("Malformed from address %s\n", gai_strerror(error));
1658: return ("???");
1659: }
1660: if (!resolve)
1661: return (ip);
1662:
1663: sigemptyset(&nmask);
1664: sigaddset(&nmask, SIGHUP);
1665: sigprocmask(SIG_BLOCK, &nmask, &omask);
1666: error = getnameinfo((struct sockaddr *)f,
1667: ((struct sockaddr *)f)->sa_len,
1668: hname, sizeof hname, NULL, 0, NI_NAMEREQD);
1669: sigprocmask(SIG_SETMASK, &omask, NULL);
1670: if (error) {
1671: dprintf("Host name for your address (%s) unknown\n", ip);
1672: return (ip);
1673: }
1674: hl = strlen(hname);
1675: if (hl > 0 && hname[hl-1] == '.')
1676: hname[--hl] = '\0';
1677: trimdomain(hname, hl);
1678: return (hname);
1679: }
1680:
1681: static void
1682: dodie(int signo)
1683: {
1684:
1685: WantDie = signo;
1686: }
1687:
1688: static void
1689: domark(int signo __unused)
1690: {
1691:
1692: MarkSet = 1;
1693: }
1694:
1695: /*
1696: * Print syslogd errors some place.
1697: */
1698: static void
1699: logerror(const char *type)
1700: {
1701: char buf[512];
1702: static int recursed = 0;
1703:
1704: /* If there's an error while trying to log an error, give up. */
1705: if (recursed)
1706: return;
1707: recursed++;
1708: if (errno)
1709: (void)snprintf(buf,
1710: sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1711: else
1712: (void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1713: errno = 0;
1714: dprintf("%s\n", buf);
1715: logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1716: recursed--;
1717: }
1718:
1719: static void
1720: die(int signo)
1721: {
1722: struct filed *f;
1723: struct funix *fx;
1724: int was_initialized;
1725: char buf[100];
1726:
1727: was_initialized = Initialized;
1728: Initialized = 0; /* Don't log SIGCHLDs. */
1729: for (f = Files; f != NULL; f = f->f_next) {
1730: /* flush any pending output */
1731: if (f->f_prevcount)
1732: fprintlog(f, 0, (char *)NULL);
1733: if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) {
1734: (void)close(f->f_file);
1735: f->f_un.f_pipe.f_pid = 0;
1736: }
1737: }
1738: Initialized = was_initialized;
1739: if (signo) {
1740: dprintf("syslogd: exiting on signal %d\n", signo);
1741: (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1742: errno = 0;
1743: logerror(buf);
1744: }
1745: STAILQ_FOREACH(fx, &funixes, next)
1746: (void)unlink(fx->name);
1747: pidfile_remove(pfh);
1748:
1749: exit(1);
1750: }
1751:
1752: /*
1753: * INIT -- Initialize syslogd from configuration table
1754: */
1755: static void
1756: init(int signo)
1757: {
1758: int i;
1759: FILE *cf;
1760: struct filed *f, *next, **nextp;
1761: char *p;
1762: char cline[LINE_MAX];
1763: char prog[NAME_MAX+1];
1764: char host[MAXHOSTNAMELEN];
1765: char oldLocalHostName[MAXHOSTNAMELEN];
1766: char hostMsg[2*MAXHOSTNAMELEN+40];
1767: char bootfileMsg[LINE_MAX];
1768:
1769: dprintf("init\n");
1770:
1771: /*
1772: * Load hostname (may have changed).
1773: */
1774: if (signo != 0)
1775: (void)strlcpy(oldLocalHostName, LocalHostName,
1776: sizeof(oldLocalHostName));
1777: if (gethostname(LocalHostName, sizeof(LocalHostName)))
1778: err(EX_OSERR, "gethostname() failed");
1779: if ((p = strchr(LocalHostName, '.')) != NULL) {
1780: *p++ = '\0';
1781: LocalDomain = p;
1782: } else {
1783: LocalDomain = "";
1784: }
1785:
1786: /*
1787: * Close all open log files.
1788: */
1789: Initialized = 0;
1790: for (f = Files; f != NULL; f = next) {
1791: /* flush any pending output */
1792: if (f->f_prevcount)
1793: fprintlog(f, 0, (char *)NULL);
1794:
1795: switch (f->f_type) {
1796: case F_FILE:
1797: case F_FORW:
1798: case F_CONSOLE:
1799: case F_TTY:
1800: (void)close(f->f_file);
1801: break;
1802: case F_PIPE:
1803: if (f->f_un.f_pipe.f_pid > 0) {
1804: (void)close(f->f_file);
1805: deadq_enter(f->f_un.f_pipe.f_pid,
1806: f->f_un.f_pipe.f_pname);
1807: }
1808: f->f_un.f_pipe.f_pid = 0;
1809: break;
1.1.2.2 misho 1810: // CPP:
1811: case F_RING:
1812: munmap(f->f_un.f_ring.f_footer, sizeof(struct clogFooter));
1813: close(f->f_file);
1814: break;
1815: // CPP::
1.1.2.1 misho 1816: }
1817: next = f->f_next;
1818: if (f->f_program) free(f->f_program);
1819: if (f->f_host) free(f->f_host);
1820: free((char *)f);
1821: }
1822: Files = NULL;
1823: nextp = &Files;
1824:
1825: /* open the configuration file */
1826: if ((cf = fopen(ConfFile, "r")) == NULL) {
1827: dprintf("cannot open %s\n", ConfFile);
1828: *nextp = (struct filed *)calloc(1, sizeof(*f));
1829: if (*nextp == NULL) {
1830: logerror("calloc");
1831: exit(1);
1832: }
1833: cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1834: (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1835: if ((*nextp)->f_next == NULL) {
1836: logerror("calloc");
1837: exit(1);
1838: }
1839: cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1840: Initialized = 1;
1841: return;
1842: }
1843:
1844: /*
1845: * Foreach line in the conf table, open that file.
1846: */
1847: f = NULL;
1848: (void)strlcpy(host, "*", sizeof(host));
1849: (void)strlcpy(prog, "*", sizeof(prog));
1850: while (fgets(cline, sizeof(cline), cf) != NULL) {
1851: /*
1852: * check for end-of-section, comments, strip off trailing
1853: * spaces and newline character. #!prog is treated specially:
1854: * following lines apply only to that program.
1855: */
1856: for (p = cline; isspace(*p); ++p)
1857: continue;
1858: if (*p == 0)
1859: continue;
1860: if (*p == '#') {
1861: p++;
1862: if (*p != '!' && *p != '+' && *p != '-')
1863: continue;
1864: }
1865: if (*p == '+' || *p == '-') {
1866: host[0] = *p++;
1867: while (isspace(*p))
1868: p++;
1869: if ((!*p) || (*p == '*')) {
1870: (void)strlcpy(host, "*", sizeof(host));
1871: continue;
1872: }
1873: if (*p == '@')
1874: p = LocalHostName;
1875: for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1876: if (!isalnum(*p) && *p != '.' && *p != '-'
1877: && *p != ',' && *p != ':' && *p != '%')
1878: break;
1879: host[i] = *p++;
1880: }
1881: host[i] = '\0';
1882: continue;
1883: }
1884: if (*p == '!') {
1885: p++;
1886: while (isspace(*p)) p++;
1887: if ((!*p) || (*p == '*')) {
1888: (void)strlcpy(prog, "*", sizeof(prog));
1889: continue;
1890: }
1891: for (i = 0; i < NAME_MAX; i++) {
1892: if (!isprint(p[i]) || isspace(p[i]))
1893: break;
1894: prog[i] = p[i];
1895: }
1896: prog[i] = 0;
1897: continue;
1898: }
1899: for (p = cline + 1; *p != '\0'; p++) {
1900: if (*p != '#')
1901: continue;
1902: if (*(p - 1) == '\\') {
1903: strcpy(p - 1, p);
1904: p--;
1905: continue;
1906: }
1907: *p = '\0';
1908: break;
1909: }
1910: for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1911: cline[i] = '\0';
1912: f = (struct filed *)calloc(1, sizeof(*f));
1913: if (f == NULL) {
1914: logerror("calloc");
1915: exit(1);
1916: }
1917: *nextp = f;
1918: nextp = &f->f_next;
1919: cfline(cline, f, prog, host);
1920: }
1921:
1922: /* close the configuration file */
1923: (void)fclose(cf);
1924:
1925: Initialized = 1;
1926:
1927: if (Debug) {
1928: int port;
1929: for (f = Files; f; f = f->f_next) {
1930: for (i = 0; i <= LOG_NFACILITIES; i++)
1931: if (f->f_pmask[i] == INTERNAL_NOPRI)
1932: printf("X ");
1933: else
1934: printf("%d ", f->f_pmask[i]);
1935: printf("%s: ", TypeNames[f->f_type]);
1936: switch (f->f_type) {
1937: case F_FILE:
1938: printf("%s", f->f_un.f_fname);
1939: break;
1940:
1941: case F_CONSOLE:
1942: case F_TTY:
1943: printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1944: break;
1945:
1946: case F_FORW:
1947: port = (int)ntohs(((struct sockaddr_in *)
1948: (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1949: if (port != 514) {
1950: printf("%s:%d",
1951: f->f_un.f_forw.f_hname, port);
1952: } else {
1953: printf("%s", f->f_un.f_forw.f_hname);
1954: }
1955: break;
1956:
1.1.2.2 misho 1957: // CPP:
1958: case F_RING:
1959: printf("%s", f->f_un.f_ring.f_rname);
1960: break;
1961: // CPP::
1962:
1.1.2.1 misho 1963: case F_PIPE:
1964: printf("%s", f->f_un.f_pipe.f_pname);
1965: break;
1966:
1967: case F_USERS:
1968: for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1969: printf("%s, ", f->f_un.f_uname[i]);
1970: break;
1971: }
1972: if (f->f_program)
1973: printf(" (%s)", f->f_program);
1974: printf("\n");
1975: }
1976: }
1977:
1978: logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1979: dprintf("syslogd: restarted\n");
1980: /*
1981: * Log a change in hostname, but only on a restart.
1982: */
1983: if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1984: (void)snprintf(hostMsg, sizeof(hostMsg),
1985: "syslogd: hostname changed, \"%s\" to \"%s\"",
1986: oldLocalHostName, LocalHostName);
1987: logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1988: dprintf("%s\n", hostMsg);
1989: }
1990: /*
1991: * Log the kernel boot file if we aren't going to use it as
1992: * the prefix, and if this is *not* a restart.
1993: */
1994: if (signo == 0 && !use_bootfile) {
1995: (void)snprintf(bootfileMsg, sizeof(bootfileMsg),
1996: "syslogd: kernel boot file is %s", bootfile);
1997: logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1998: dprintf("%s\n", bootfileMsg);
1999: }
2000: }
2001:
2002: /*
2003: * Crack a configuration file line
2004: */
2005: static void
2006: cfline(const char *line, struct filed *f, const char *prog, const char *host)
2007: {
2008: struct addrinfo hints, *res;
2009: int error, i, pri, syncfile;
2010: const char *p, *q;
2011: char *bp;
2012: char buf[MAXLINE], ebuf[100];
1.1.2.2 misho 2013: struct stat sb;
1.1.2.1 misho 2014:
2015: dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
2016:
2017: errno = 0; /* keep strerror() stuff out of logerror messages */
2018:
2019: /* clear out file entry */
2020: memset(f, 0, sizeof(*f));
2021: for (i = 0; i <= LOG_NFACILITIES; i++)
2022: f->f_pmask[i] = INTERNAL_NOPRI;
2023:
2024: /* save hostname if any */
2025: if (host && *host == '*')
2026: host = NULL;
2027: if (host) {
2028: int hl;
2029:
2030: f->f_host = strdup(host);
2031: if (f->f_host == NULL) {
2032: logerror("strdup");
2033: exit(1);
2034: }
2035: hl = strlen(f->f_host);
2036: if (hl > 0 && f->f_host[hl-1] == '.')
2037: f->f_host[--hl] = '\0';
2038: trimdomain(f->f_host, hl);
2039: }
2040:
2041: /* save program name if any */
2042: if (prog && *prog == '*')
2043: prog = NULL;
2044: if (prog) {
2045: f->f_program = strdup(prog);
2046: if (f->f_program == NULL) {
2047: logerror("strdup");
2048: exit(1);
2049: }
2050: }
2051:
2052: /* scan through the list of selectors */
2053: for (p = line; *p && *p != '\t' && *p != ' ';) {
2054: int pri_done;
2055: int pri_cmp;
2056: int pri_invert;
2057:
2058: /* find the end of this facility name list */
2059: for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
2060: continue;
2061:
2062: /* get the priority comparison */
2063: pri_cmp = 0;
2064: pri_done = 0;
2065: pri_invert = 0;
2066: if (*q == '!') {
2067: pri_invert = 1;
2068: q++;
2069: }
2070: while (!pri_done) {
2071: switch (*q) {
2072: case '<':
2073: pri_cmp |= PRI_LT;
2074: q++;
2075: break;
2076: case '=':
2077: pri_cmp |= PRI_EQ;
2078: q++;
2079: break;
2080: case '>':
2081: pri_cmp |= PRI_GT;
2082: q++;
2083: break;
2084: default:
2085: pri_done++;
2086: break;
2087: }
2088: }
2089:
2090: /* collect priority name */
2091: for (bp = buf; *q && !strchr("\t,; ", *q); )
2092: *bp++ = *q++;
2093: *bp = '\0';
2094:
2095: /* skip cruft */
2096: while (strchr(",;", *q))
2097: q++;
2098:
2099: /* decode priority name */
2100: if (*buf == '*') {
2101: pri = LOG_PRIMASK;
2102: pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
2103: } else {
2104: /* Ignore trailing spaces. */
2105: for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
2106: buf[i] = '\0';
2107:
2108: pri = decode(buf, prioritynames);
2109: if (pri < 0) {
2110: (void)snprintf(ebuf, sizeof ebuf,
2111: "unknown priority name \"%s\"", buf);
2112: logerror(ebuf);
2113: return;
2114: }
2115: }
2116: if (!pri_cmp)
2117: pri_cmp = (UniquePriority)
2118: ? (PRI_EQ)
2119: : (PRI_EQ | PRI_GT)
2120: ;
2121: if (pri_invert)
2122: pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
2123:
2124: /* scan facilities */
2125: while (*p && !strchr("\t.; ", *p)) {
2126: for (bp = buf; *p && !strchr("\t,;. ", *p); )
2127: *bp++ = *p++;
2128: *bp = '\0';
2129:
2130: if (*buf == '*') {
2131: for (i = 0; i < LOG_NFACILITIES; i++) {
2132: f->f_pmask[i] = pri;
2133: f->f_pcmp[i] = pri_cmp;
2134: }
2135: } else {
2136: i = decode(buf, facilitynames);
2137: if (i < 0) {
2138: (void)snprintf(ebuf, sizeof ebuf,
2139: "unknown facility name \"%s\"",
2140: buf);
2141: logerror(ebuf);
2142: return;
2143: }
2144: f->f_pmask[i >> 3] = pri;
2145: f->f_pcmp[i >> 3] = pri_cmp;
2146: }
2147: while (*p == ',' || *p == ' ')
2148: p++;
2149: }
2150:
2151: p = q;
2152: }
2153:
2154: /* skip to action part */
2155: while (*p == '\t' || *p == ' ')
2156: p++;
2157:
2158: if (*p == '-') {
2159: syncfile = 0;
2160: p++;
2161: } else
2162: syncfile = 1;
2163:
2164: switch (*p) {
2165: case '@':
2166: {
2167: char *tp;
2168: /*
2169: * scan forward to see if there is a port defined.
2170: * so we can't use strlcpy..
2171: */
2172: i = sizeof(f->f_un.f_forw.f_hname);
2173: tp = f->f_un.f_forw.f_hname;
2174: p++;
2175:
2176: while (*p && (*p != ':') && (i-- > 0)) {
2177: *tp++ = *p++;
2178: }
2179: *tp = '\0';
2180: }
2181: /* See if we copied a domain and have a port */
2182: if (*p == ':')
2183: p++;
2184: else
2185: p = NULL;
2186:
2187: memset(&hints, 0, sizeof(hints));
2188: hints.ai_family = family;
2189: hints.ai_socktype = SOCK_DGRAM;
2190: error = getaddrinfo(f->f_un.f_forw.f_hname,
2191: p ? p : "syslog", &hints, &res);
2192: if (error) {
2193: logerror(gai_strerror(error));
2194: break;
2195: }
2196: f->f_un.f_forw.f_addr = res;
2197: f->f_type = F_FORW;
2198: break;
2199:
2200: case '/':
2201: if ((f->f_file = open(p, logflags, 0600)) < 0) {
2202: f->f_type = F_UNUSED;
2203: logerror(p);
2204: break;
2205: }
2206: if (syncfile)
2207: f->f_flags |= FFLAG_SYNC;
2208: if (isatty(f->f_file)) {
2209: if (strcmp(p, ctty) == 0)
2210: f->f_type = F_CONSOLE;
2211: else
2212: f->f_type = F_TTY;
2213: (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
2214: sizeof(f->f_un.f_fname));
2215: } else {
2216: (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
2217: f->f_type = F_FILE;
2218: }
2219: break;
2220:
1.1.2.2 misho 2221: // CPP:
2222: case '%':
2223: if ((f->f_file = open(p + 1, O_RDWR, 0)) < 0) {
2224: f->f_type = F_UNUSED;
2225: logerror(p + 1);
2226: break;
2227: }
2228: if (fstat(f->f_file, &sb) < 0) {
2229: close(f->f_file);
2230: f->f_type = F_UNUSED;
2231: logerror(p + 1);
2232: break;
2233: }
2234: f->f_un.f_ring.f_footer = mmap(NULL, sizeof(struct clogFooter), PROT_READ | PROT_WRITE, MAP_SHARED,
2235: f->f_file, sb.st_size - sizeof(struct clogFooter));
2236: if (!f->f_un.f_ring.f_footer) {
2237: close(f->f_file);
2238: f->f_type = F_UNUSED;
2239: logerror(p + 1);
2240: break;
2241: }
2242: if (memcmp(&(f->f_un.f_ring.f_footer->cf_magic), MAGIC, 4)) {
2243: munmap(f->f_un.f_ring.f_footer, sizeof(struct clogFooter));
2244: close(f->f_file);
2245: f->f_type = F_UNUSED;
2246: errno = ENODEV;
2247: logerror(p + 1);
2248: break;
2249: }
2250: f->f_un.f_ring.f_size = sb.st_size;
2251: strcpy(f->f_un.f_ring.f_rname, p + 1);
2252: f->f_type = F_RING;
2253: break;
2254: // CPP::
2255:
1.1.2.1 misho 2256: case '|':
2257: f->f_un.f_pipe.f_pid = 0;
2258: (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1,
2259: sizeof(f->f_un.f_pipe.f_pname));
2260: f->f_type = F_PIPE;
2261: break;
2262:
2263: case '*':
2264: f->f_type = F_WALL;
2265: break;
2266:
2267: default:
2268: for (i = 0; i < MAXUNAMES && *p; i++) {
2269: for (q = p; *q && *q != ','; )
2270: q++;
2271: (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1);
2272: if ((q - p) >= MAXLOGNAME)
2273: f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0';
2274: else
2275: f->f_un.f_uname[i][q - p] = '\0';
2276: while (*q == ',' || *q == ' ')
2277: q++;
2278: p = q;
2279: }
2280: f->f_type = F_USERS;
2281: break;
2282: }
2283: }
2284:
2285:
2286: /*
2287: * Decode a symbolic name to a numeric value
2288: */
2289: static int
2290: decode(const char *name, CODE *codetab)
2291: {
2292: CODE *c;
2293: char *p, buf[40];
2294:
2295: if (isdigit(*name))
2296: return (atoi(name));
2297:
2298: for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2299: if (isupper(*name))
2300: *p = tolower(*name);
2301: else
2302: *p = *name;
2303: }
2304: *p = '\0';
2305: for (c = codetab; c->c_name; c++)
2306: if (!strcmp(buf, c->c_name))
2307: return (c->c_val);
2308:
2309: return (-1);
2310: }
2311:
2312: static void
2313: markit(void)
2314: {
2315: struct filed *f;
2316: dq_t q, next;
2317:
2318: now = time((time_t *)NULL);
2319: MarkSeq += TIMERINTVL;
2320: if (MarkSeq >= MarkInterval) {
2321: logmsg(LOG_INFO, "-- MARK --",
2322: LocalHostName, ADDDATE|MARK);
2323: MarkSeq = 0;
2324: }
2325:
2326: for (f = Files; f; f = f->f_next) {
2327: if (f->f_prevcount && now >= REPEATTIME(f)) {
2328: dprintf("flush %s: repeated %d times, %d sec.\n",
2329: TypeNames[f->f_type], f->f_prevcount,
2330: repeatinterval[f->f_repeatcount]);
2331: fprintlog(f, 0, (char *)NULL);
2332: BACKOFF(f);
2333: }
2334: }
2335:
2336: /* Walk the dead queue, and see if we should signal somebody. */
2337: for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2338: next = TAILQ_NEXT(q, dq_entries);
2339:
2340: switch (q->dq_timeout) {
2341: case 0:
2342: /* Already signalled once, try harder now. */
2343: if (kill(q->dq_pid, SIGKILL) != 0)
2344: (void)deadq_remove(q->dq_pid);
2345: break;
2346:
2347: case 1:
2348: /*
2349: * Timed out on dead queue, send terminate
2350: * signal. Note that we leave the removal
2351: * from the dead queue to reapchild(), which
2352: * will also log the event (unless the process
2353: * didn't even really exist, in case we simply
2354: * drop it from the dead queue).
2355: */
2356: if (kill(q->dq_pid, SIGTERM) != 0)
2357: (void)deadq_remove(q->dq_pid);
2358: /* FALLTHROUGH */
2359:
2360: default:
2361: q->dq_timeout--;
2362: }
2363: }
2364: MarkSet = 0;
2365: (void)alarm(TIMERINTVL);
2366: }
2367:
2368: /*
2369: * fork off and become a daemon, but wait for the child to come online
2370: * before returing to the parent, or we get disk thrashing at boot etc.
2371: * Set a timer so we don't hang forever if it wedges.
2372: */
2373: static int
2374: waitdaemon(int nochdir, int noclose, int maxwait)
2375: {
2376: int fd;
2377: int status;
2378: pid_t pid, childpid;
2379:
2380: switch (childpid = fork()) {
2381: case -1:
2382: return (-1);
2383: case 0:
2384: break;
2385: default:
2386: signal(SIGALRM, timedout);
2387: alarm(maxwait);
2388: while ((pid = wait3(&status, 0, NULL)) != -1) {
2389: if (WIFEXITED(status))
2390: errx(1, "child pid %d exited with return code %d",
2391: pid, WEXITSTATUS(status));
2392: if (WIFSIGNALED(status))
2393: errx(1, "child pid %d exited on signal %d%s",
2394: pid, WTERMSIG(status),
2395: WCOREDUMP(status) ? " (core dumped)" :
2396: "");
2397: if (pid == childpid) /* it's gone... */
2398: break;
2399: }
2400: exit(0);
2401: }
2402:
2403: if (setsid() == -1)
2404: return (-1);
2405:
2406: if (!nochdir)
2407: (void)chdir("/");
2408:
2409: if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2410: (void)dup2(fd, STDIN_FILENO);
2411: (void)dup2(fd, STDOUT_FILENO);
2412: (void)dup2(fd, STDERR_FILENO);
2413: if (fd > 2)
2414: (void)close (fd);
2415: }
2416: return (getppid());
2417: }
2418:
2419: /*
2420: * We get a SIGALRM from the child when it's running and finished doing it's
2421: * fsync()'s or O_SYNC writes for all the boot messages.
2422: *
2423: * We also get a signal from the kernel if the timer expires, so check to
2424: * see what happened.
2425: */
2426: static void
2427: timedout(int sig __unused)
2428: {
2429: int left;
2430: left = alarm(0);
2431: signal(SIGALRM, SIG_DFL);
2432: if (left == 0)
2433: errx(1, "timed out waiting for child");
2434: else
2435: _exit(0);
2436: }
2437:
2438: /*
2439: * Add `s' to the list of allowable peer addresses to accept messages
2440: * from.
2441: *
2442: * `s' is a string in the form:
2443: *
2444: * [*]domainname[:{servicename|portnumber|*}]
2445: *
2446: * or
2447: *
2448: * netaddr/maskbits[:{servicename|portnumber|*}]
2449: *
2450: * Returns -1 on error, 0 if the argument was valid.
2451: */
2452: static int
2453: allowaddr(char *s)
2454: {
2455: char *cp1, *cp2;
2456: struct allowedpeer ap;
2457: struct servent *se;
2458: int masklen = -1;
2459: struct addrinfo hints, *res;
2460: struct in_addr *addrp, *maskp;
2461: #ifdef INET6
2462: int i;
2463: u_int32_t *addr6p, *mask6p;
2464: #endif
2465: char ip[NI_MAXHOST];
2466:
2467: #ifdef INET6
2468: if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2469: #endif
2470: cp1 = s;
2471: if ((cp1 = strrchr(cp1, ':'))) {
2472: /* service/port provided */
2473: *cp1++ = '\0';
2474: if (strlen(cp1) == 1 && *cp1 == '*')
2475: /* any port allowed */
2476: ap.port = 0;
2477: else if ((se = getservbyname(cp1, "udp"))) {
2478: ap.port = ntohs(se->s_port);
2479: } else {
2480: ap.port = strtol(cp1, &cp2, 0);
2481: if (*cp2 != '\0')
2482: return (-1); /* port not numeric */
2483: }
2484: } else {
2485: if ((se = getservbyname("syslog", "udp")))
2486: ap.port = ntohs(se->s_port);
2487: else
2488: /* sanity, should not happen */
2489: ap.port = 514;
2490: }
2491:
2492: if ((cp1 = strchr(s, '/')) != NULL &&
2493: strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2494: *cp1 = '\0';
2495: if ((masklen = atoi(cp1 + 1)) < 0)
2496: return (-1);
2497: }
2498: #ifdef INET6
2499: if (*s == '[') {
2500: cp2 = s + strlen(s) - 1;
2501: if (*cp2 == ']') {
2502: ++s;
2503: *cp2 = '\0';
2504: } else {
2505: cp2 = NULL;
2506: }
2507: } else {
2508: cp2 = NULL;
2509: }
2510: #endif
2511: memset(&hints, 0, sizeof(hints));
2512: hints.ai_family = PF_UNSPEC;
2513: hints.ai_socktype = SOCK_DGRAM;
2514: hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2515: if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2516: ap.isnumeric = 1;
2517: memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2518: memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2519: ap.a_mask.ss_family = res->ai_family;
2520: if (res->ai_family == AF_INET) {
2521: ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2522: maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2523: addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2524: if (masklen < 0) {
2525: /* use default netmask */
2526: if (IN_CLASSA(ntohl(addrp->s_addr)))
2527: maskp->s_addr = htonl(IN_CLASSA_NET);
2528: else if (IN_CLASSB(ntohl(addrp->s_addr)))
2529: maskp->s_addr = htonl(IN_CLASSB_NET);
2530: else
2531: maskp->s_addr = htonl(IN_CLASSC_NET);
2532: } else if (masklen <= 32) {
2533: /* convert masklen to netmask */
2534: if (masklen == 0)
2535: maskp->s_addr = 0;
2536: else
2537: maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2538: } else {
2539: freeaddrinfo(res);
2540: return (-1);
2541: }
2542: /* Lose any host bits in the network number. */
2543: addrp->s_addr &= maskp->s_addr;
2544: }
2545: #ifdef INET6
2546: else if (res->ai_family == AF_INET6 && masklen <= 128) {
2547: ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2548: if (masklen < 0)
2549: masklen = 128;
2550: mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2551: /* convert masklen to netmask */
2552: while (masklen > 0) {
2553: if (masklen < 32) {
2554: *mask6p = htonl(~(0xffffffff >> masklen));
2555: break;
2556: }
2557: *mask6p++ = 0xffffffff;
2558: masklen -= 32;
2559: }
2560: /* Lose any host bits in the network number. */
2561: mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2562: addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2563: for (i = 0; i < 4; i++)
2564: addr6p[i] &= mask6p[i];
2565: }
2566: #endif
2567: else {
2568: freeaddrinfo(res);
2569: return (-1);
2570: }
2571: freeaddrinfo(res);
2572: } else {
2573: /* arg `s' is domain name */
2574: ap.isnumeric = 0;
2575: ap.a_name = s;
2576: if (cp1)
2577: *cp1 = '/';
2578: #ifdef INET6
2579: if (cp2) {
2580: *cp2 = ']';
2581: --s;
2582: }
2583: #endif
2584: }
2585:
2586: if (Debug) {
2587: printf("allowaddr: rule %d: ", NumAllowed);
2588: if (ap.isnumeric) {
2589: printf("numeric, ");
2590: getnameinfo((struct sockaddr *)&ap.a_addr,
2591: ((struct sockaddr *)&ap.a_addr)->sa_len,
2592: ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2593: printf("addr = %s, ", ip);
2594: getnameinfo((struct sockaddr *)&ap.a_mask,
2595: ((struct sockaddr *)&ap.a_mask)->sa_len,
2596: ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2597: printf("mask = %s; ", ip);
2598: } else {
2599: printf("domainname = %s; ", ap.a_name);
2600: }
2601: printf("port = %d\n", ap.port);
2602: }
2603:
2604: if ((AllowedPeers = realloc(AllowedPeers,
2605: ++NumAllowed * sizeof(struct allowedpeer)))
2606: == NULL) {
2607: logerror("realloc");
2608: exit(1);
2609: }
2610: memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2611: return (0);
2612: }
2613:
2614: /*
2615: * Validate that the remote peer has permission to log to us.
2616: */
2617: static int
2618: validate(struct sockaddr *sa, const char *hname)
2619: {
2620: int i;
2621: size_t l1, l2;
2622: char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2623: struct allowedpeer *ap;
2624: struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2625: #ifdef INET6
2626: int j, reject;
2627: struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2628: #endif
2629: struct addrinfo hints, *res;
2630: u_short sport;
2631:
2632: if (NumAllowed == 0)
2633: /* traditional behaviour, allow everything */
2634: return (1);
2635:
2636: (void)strlcpy(name, hname, sizeof(name));
2637: memset(&hints, 0, sizeof(hints));
2638: hints.ai_family = PF_UNSPEC;
2639: hints.ai_socktype = SOCK_DGRAM;
2640: hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2641: if (getaddrinfo(name, NULL, &hints, &res) == 0)
2642: freeaddrinfo(res);
2643: else if (strchr(name, '.') == NULL) {
2644: strlcat(name, ".", sizeof name);
2645: strlcat(name, LocalDomain, sizeof name);
2646: }
2647: if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2648: NI_NUMERICHOST | NI_NUMERICSERV) != 0)
2649: return (0); /* for safety, should not occur */
2650: dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2651: ip, port, name);
2652: sport = atoi(port);
2653:
2654: /* now, walk down the list */
2655: for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2656: if (ap->port != 0 && ap->port != sport) {
2657: dprintf("rejected in rule %d due to port mismatch.\n", i);
2658: continue;
2659: }
2660:
2661: if (ap->isnumeric) {
2662: if (ap->a_addr.ss_family != sa->sa_family) {
2663: dprintf("rejected in rule %d due to address family mismatch.\n", i);
2664: continue;
2665: }
2666: if (ap->a_addr.ss_family == AF_INET) {
2667: sin4 = (struct sockaddr_in *)sa;
2668: a4p = (struct sockaddr_in *)&ap->a_addr;
2669: m4p = (struct sockaddr_in *)&ap->a_mask;
2670: if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2671: != a4p->sin_addr.s_addr) {
2672: dprintf("rejected in rule %d due to IP mismatch.\n", i);
2673: continue;
2674: }
2675: }
2676: #ifdef INET6
2677: else if (ap->a_addr.ss_family == AF_INET6) {
2678: sin6 = (struct sockaddr_in6 *)sa;
2679: a6p = (struct sockaddr_in6 *)&ap->a_addr;
2680: m6p = (struct sockaddr_in6 *)&ap->a_mask;
2681: if (a6p->sin6_scope_id != 0 &&
2682: sin6->sin6_scope_id != a6p->sin6_scope_id) {
2683: dprintf("rejected in rule %d due to scope mismatch.\n", i);
2684: continue;
2685: }
2686: reject = 0;
2687: for (j = 0; j < 16; j += 4) {
2688: if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2689: != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2690: ++reject;
2691: break;
2692: }
2693: }
2694: if (reject) {
2695: dprintf("rejected in rule %d due to IP mismatch.\n", i);
2696: continue;
2697: }
2698: }
2699: #endif
2700: else
2701: continue;
2702: } else {
2703: cp = ap->a_name;
2704: l1 = strlen(name);
2705: if (*cp == '*') {
2706: /* allow wildmatch */
2707: cp++;
2708: l2 = strlen(cp);
2709: if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2710: dprintf("rejected in rule %d due to name mismatch.\n", i);
2711: continue;
2712: }
2713: } else {
2714: /* exact match */
2715: l2 = strlen(cp);
2716: if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2717: dprintf("rejected in rule %d due to name mismatch.\n", i);
2718: continue;
2719: }
2720: }
2721: }
2722: dprintf("accepted in rule %d.\n", i);
2723: return (1); /* hooray! */
2724: }
2725: return (0);
2726: }
2727:
2728: /*
2729: * Fairly similar to popen(3), but returns an open descriptor, as
2730: * opposed to a FILE *.
2731: */
2732: static int
2733: p_open(const char *prog, pid_t *rpid)
2734: {
2735: int pfd[2], nulldesc, i;
2736: pid_t pid;
2737: sigset_t omask, mask;
2738: char *argv[4]; /* sh -c cmd NULL */
2739: char errmsg[200];
2740:
2741: if (pipe(pfd) == -1)
2742: return (-1);
2743: if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2744: /* we are royally screwed anyway */
2745: return (-1);
2746:
2747: sigemptyset(&mask);
2748: sigaddset(&mask, SIGALRM);
2749: sigaddset(&mask, SIGHUP);
2750: sigprocmask(SIG_BLOCK, &mask, &omask);
2751: switch ((pid = fork())) {
2752: case -1:
2753: sigprocmask(SIG_SETMASK, &omask, 0);
2754: close(nulldesc);
2755: return (-1);
2756:
2757: case 0:
2758: argv[0] = strdup("sh");
2759: argv[1] = strdup("-c");
2760: argv[2] = strdup(prog);
2761: argv[3] = NULL;
2762: if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2763: logerror("strdup");
2764: exit(1);
2765: }
2766:
2767: alarm(0);
2768: (void)setsid(); /* Avoid catching SIGHUPs. */
2769:
2770: /*
2771: * Throw away pending signals, and reset signal
2772: * behaviour to standard values.
2773: */
2774: signal(SIGALRM, SIG_IGN);
2775: signal(SIGHUP, SIG_IGN);
2776: sigprocmask(SIG_SETMASK, &omask, 0);
2777: signal(SIGPIPE, SIG_DFL);
2778: signal(SIGQUIT, SIG_DFL);
2779: signal(SIGALRM, SIG_DFL);
2780: signal(SIGHUP, SIG_DFL);
2781:
2782: dup2(pfd[0], STDIN_FILENO);
2783: dup2(nulldesc, STDOUT_FILENO);
2784: dup2(nulldesc, STDERR_FILENO);
2785: for (i = getdtablesize(); i > 2; i--)
2786: (void)close(i);
2787:
2788: (void)execvp(_PATH_BSHELL, argv);
2789: _exit(255);
2790: }
2791:
2792: sigprocmask(SIG_SETMASK, &omask, 0);
2793: close(nulldesc);
2794: close(pfd[0]);
2795: /*
2796: * Avoid blocking on a hung pipe. With O_NONBLOCK, we are
2797: * supposed to get an EWOULDBLOCK on writev(2), which is
2798: * caught by the logic above anyway, which will in turn close
2799: * the pipe, and fork a new logging subprocess if necessary.
2800: * The stale subprocess will be killed some time later unless
2801: * it terminated itself due to closing its input pipe (so we
2802: * get rid of really dead puppies).
2803: */
2804: if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2805: /* This is bad. */
2806: (void)snprintf(errmsg, sizeof errmsg,
2807: "Warning: cannot change pipe to PID %d to "
2808: "non-blocking behaviour.",
2809: (int)pid);
2810: logerror(errmsg);
2811: }
2812: *rpid = pid;
2813: return (pfd[1]);
2814: }
2815:
2816: static void
2817: deadq_enter(pid_t pid, const char *name)
2818: {
2819: dq_t p;
2820: int status;
2821:
2822: /*
2823: * Be paranoid, if we can't signal the process, don't enter it
2824: * into the dead queue (perhaps it's already dead). If possible,
2825: * we try to fetch and log the child's status.
2826: */
2827: if (kill(pid, 0) != 0) {
2828: if (waitpid(pid, &status, WNOHANG) > 0)
2829: log_deadchild(pid, status, name);
2830: return;
2831: }
2832:
2833: p = malloc(sizeof(struct deadq_entry));
2834: if (p == NULL) {
2835: logerror("malloc");
2836: exit(1);
2837: }
2838:
2839: p->dq_pid = pid;
2840: p->dq_timeout = DQ_TIMO_INIT;
2841: TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2842: }
2843:
2844: static int
2845: deadq_remove(pid_t pid)
2846: {
2847: dq_t q;
2848:
2849: TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2850: if (q->dq_pid == pid) {
2851: TAILQ_REMOVE(&deadq_head, q, dq_entries);
2852: free(q);
2853: return (1);
2854: }
2855: }
2856:
2857: return (0);
2858: }
2859:
2860: static void
2861: log_deadchild(pid_t pid, int status, const char *name)
2862: {
2863: int code;
2864: char buf[256];
2865: const char *reason;
2866:
2867: errno = 0; /* Keep strerror() stuff out of logerror messages. */
2868: if (WIFSIGNALED(status)) {
2869: reason = "due to signal";
2870: code = WTERMSIG(status);
2871: } else {
2872: reason = "with status";
2873: code = WEXITSTATUS(status);
2874: if (code == 0)
2875: return;
2876: }
2877: (void)snprintf(buf, sizeof buf,
2878: "Logging subprocess %d (%s) exited %s %d.",
2879: pid, name, reason, code);
2880: logerror(buf);
2881: }
2882:
2883: static int *
2884: socksetup(int af, char *bindhostname)
2885: {
2886: struct addrinfo hints, *res, *r;
2887: const char *bindservice;
2888: char *cp;
2889: int error, maxs, *s, *socks;
2890:
2891: /*
2892: * We have to handle this case for backwards compatibility:
2893: * If there are two (or more) colons but no '[' and ']',
2894: * assume this is an inet6 address without a service.
2895: */
2896: bindservice = "syslog";
2897: if (bindhostname != NULL) {
2898: #ifdef INET6
2899: if (*bindhostname == '[' &&
2900: (cp = strchr(bindhostname + 1, ']')) != NULL) {
2901: ++bindhostname;
2902: *cp = '\0';
2903: if (cp[1] == ':' && cp[2] != '\0')
2904: bindservice = cp + 2;
2905: } else {
2906: #endif
2907: cp = strchr(bindhostname, ':');
2908: if (cp != NULL && strchr(cp + 1, ':') == NULL) {
2909: *cp = '\0';
2910: if (cp[1] != '\0')
2911: bindservice = cp + 1;
2912: if (cp == bindhostname)
2913: bindhostname = NULL;
2914: }
2915: #ifdef INET6
2916: }
2917: #endif
2918: }
2919:
2920: memset(&hints, 0, sizeof(hints));
2921: hints.ai_flags = AI_PASSIVE;
2922: hints.ai_family = af;
2923: hints.ai_socktype = SOCK_DGRAM;
2924: error = getaddrinfo(bindhostname, bindservice, &hints, &res);
2925: if (error) {
2926: logerror(gai_strerror(error));
2927: errno = 0;
2928: die(0);
2929: }
2930:
2931: /* Count max number of sockets we may open */
2932: for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2933: socks = malloc((maxs+1) * sizeof(int));
2934: if (socks == NULL) {
2935: logerror("couldn't allocate memory for sockets");
2936: die(0);
2937: }
2938:
2939: *socks = 0; /* num of sockets counter at start of array */
2940: s = socks + 1;
2941: for (r = res; r; r = r->ai_next) {
2942: int on = 1;
2943: *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2944: if (*s < 0) {
2945: logerror("socket");
2946: continue;
2947: }
2948: if (r->ai_family == AF_INET6) {
2949: if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2950: (char *)&on, sizeof (on)) < 0) {
2951: logerror("setsockopt");
2952: close(*s);
2953: continue;
2954: }
2955: }
2956: if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
2957: (char *)&on, sizeof (on)) < 0) {
2958: logerror("setsockopt");
2959: close(*s);
2960: continue;
2961: }
2962: if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2963: close(*s);
2964: logerror("bind");
2965: continue;
2966: }
2967:
2968: double_rbuf(*s);
2969:
2970: (*socks)++;
2971: s++;
2972: }
2973:
2974: if (*socks == 0) {
2975: free(socks);
2976: if (Debug)
2977: return (NULL);
2978: else
2979: die(0);
2980: }
2981: if (res)
2982: freeaddrinfo(res);
2983:
2984: return (socks);
2985: }
2986:
2987: static void
2988: double_rbuf(int fd)
2989: {
2990: socklen_t slen, len;
2991:
2992: if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
2993: len *= 2;
2994: setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen);
2995: }
2996: }