logger.c revision 146756 
1/*
2 * Copyright (c) 1983, 1993
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
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1983, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#if 0
41#ifndef lint
42static char sccsid[] = "@(#)logger.c	8.1 (Berkeley) 6/6/93";
43#endif /* not lint */
44#endif
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: head/usr.bin/logger/logger.c 146756 2005-05-29 16:04:46Z charnier $");
48
49#include <sys/types.h>
50#include <sys/socket.h>
51#include <netinet/in.h>
52
53#include <ctype.h>
54#include <err.h>
55#include <netdb.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <unistd.h>
60
61#define	SYSLOG_NAMES
62#include <syslog.h>
63
64int	decode(char *, CODE *);
65int	pencode(char *);
66static void	logmessage(int, char *, char *);
67static void	usage(void);
68
69struct socks {
70    int sock;
71    int addrlen;
72    struct sockaddr_storage addr;
73};
74
75#ifdef INET6
76int	family = PF_UNSPEC;	/* protocol family (IPv4, IPv6 or both) */
77#else
78int	family = PF_INET;	/* protocol family (IPv4 only) */
79#endif
80int	send_to_all = 0;	/* send message to all IPv4/IPv6 addresses */
81
82/*
83 * logger -- read and log utility
84 *
85 *	Reads from an input and arranges to write the result on the system
86 *	log.
87 */
88int
89main(int argc, char *argv[])
90{
91	int ch, logflags, pri;
92	char *tag, *host, buf[1024];
93
94	tag = NULL;
95	host = NULL;
96	pri = LOG_USER | LOG_NOTICE;
97	logflags = 0;
98	unsetenv("TZ");
99	while ((ch = getopt(argc, argv, "46Af:h:ip:st:")) != -1)
100		switch((char)ch) {
101		case '4':
102			family = PF_INET;
103			break;
104#ifdef INET6
105		case '6':
106			family = PF_INET6;
107			break;
108#endif
109		case 'A':
110			send_to_all++;
111			break;
112		case 'f':		/* file to log */
113			if (freopen(optarg, "r", stdin) == NULL)
114				err(1, "%s", optarg);
115			break;
116		case 'h':		/* hostname to deliver to */
117			host = optarg;
118			break;
119		case 'i':		/* log process id also */
120			logflags |= LOG_PID;
121			break;
122		case 'p':		/* priority */
123			pri = pencode(optarg);
124			break;
125		case 's':		/* log to standard error */
126			logflags |= LOG_PERROR;
127			break;
128		case 't':		/* tag */
129			tag = optarg;
130			break;
131		case '?':
132		default:
133			usage();
134		}
135	argc -= optind;
136	argv += optind;
137
138	/* setup for logging */
139	openlog(tag ? tag : getlogin(), logflags, 0);
140	(void) fclose(stdout);
141
142	/* log input line if appropriate */
143	if (argc > 0) {
144		char *p, *endp;
145		size_t len;
146
147		for (p = buf, endp = buf + sizeof(buf) - 2; *argv;) {
148			len = strlen(*argv);
149			if (p + len > endp && p > buf) {
150				logmessage(pri, host, buf);
151				p = buf;
152			}
153			if (len > sizeof(buf) - 1)
154				logmessage(pri, host, *argv++);
155			else {
156				if (p != buf)
157					*p++ = ' ';
158				bcopy(*argv++, p, len);
159				*(p += len) = '\0';
160			}
161		}
162		if (p != buf)
163			logmessage(pri, host, buf);
164	} else
165		while (fgets(buf, sizeof(buf), stdin) != NULL)
166			logmessage(pri, host, buf);
167	exit(0);
168}
169
170/*
171 *  Send the message to syslog, either on the local host, or on a remote host
172 */
173void
174logmessage(int pri, char *host, char *buf)
175{
176	static struct socks *socks;
177	static int nsock = 0;
178	struct addrinfo hints, *res, *r;
179	char *line;
180	int maxs, len, sock, error, i, lsent;
181
182	if (host == NULL) {
183		syslog(pri, "%s", buf);
184		return;
185	}
186
187	if (nsock <= 0) {	/* set up socket stuff */
188		/* resolve hostname */
189		memset(&hints, 0, sizeof(hints));
190		hints.ai_family = family;
191		hints.ai_socktype = SOCK_DGRAM;
192		error = getaddrinfo(host, "syslog", &hints, &res);
193		if (error == EAI_SERVICE) {
194			warnx("syslog/udp: unknown service");	/* not fatal */
195			error = getaddrinfo(host, "514", &hints, &res);
196		}
197		if (error)
198			errx(1, "%s: %s", gai_strerror(error), host);
199		/* count max number of sockets we may open */
200		for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
201		socks = malloc(maxs * sizeof(struct socks));
202		if (!socks)
203			errx(1, "couldn't allocate memory for sockets");
204		for (r = res; r; r = r->ai_next) {
205			sock = socket(r->ai_family, r->ai_socktype,
206				      r->ai_protocol);
207			if (sock < 0)
208				continue;
209			memcpy(&socks[nsock].addr, r->ai_addr, r->ai_addrlen);
210			socks[nsock].addrlen = r->ai_addrlen;
211			socks[nsock++].sock = sock;
212		}
213		freeaddrinfo(res);
214		if (nsock <= 0)
215			errx(1, "socket");
216	}
217
218	if ((len = asprintf(&line, "<%d>%s", pri, buf)) == -1)
219		errx(1, "asprintf");
220
221	lsent = -1;
222	for (i = 0; i < nsock; ++i) {
223		lsent = sendto(socks[i].sock, line, len, 0,
224			       (struct sockaddr *)&socks[i].addr,
225			       socks[i].addrlen);
226		if (lsent == len && !send_to_all)
227			break;
228	}
229	if (lsent != len) {
230		if (lsent == -1)
231			warn ("sendto");
232		else
233			warnx ("sendto: short send - %d bytes", lsent);
234	}
235
236	free(line);
237}
238
239/*
240 *  Decode a symbolic name to a numeric value
241 */
242int
243pencode(char *s)
244{
245	char *save;
246	int fac, lev;
247
248	for (save = s; *s && *s != '.'; ++s);
249	if (*s) {
250		*s = '\0';
251		fac = decode(save, facilitynames);
252		if (fac < 0)
253			errx(1, "unknown facility name: %s", save);
254		*s++ = '.';
255	}
256	else {
257		fac = 0;
258		s = save;
259	}
260	lev = decode(s, prioritynames);
261	if (lev < 0)
262		errx(1, "unknown priority name: %s", save);
263	return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
264}
265
266int
267decode(char *name, CODE *codetab)
268{
269	CODE *c;
270
271	if (isdigit(*name))
272		return (atoi(name));
273
274	for (c = codetab; c->c_name; c++)
275		if (!strcasecmp(name, c->c_name))
276			return (c->c_val);
277
278	return (-1);
279}
280
281static void
282usage(void)
283{
284	(void)fprintf(stderr, "usage: %s\n",
285	    "logger [-46Ais] [-f file] [-h host] [-p pri] [-t tag] [message ...]"
286	    );
287	exit(1);
288}
289