logger.c revision 102944 
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#ifndef lint
41#if 0
42static char sccsid[] = "@(#)logger.c	8.1 (Berkeley) 6/6/93";
43#endif
44#endif /* not lint */
45#include <sys/cdefs.h>
46__FBSDID("$FreeBSD: head/usr.bin/logger/logger.c 102944 2002-09-04 23:29:10Z dwmalone $");
47
48#include <sys/types.h>
49#include <sys/socket.h>
50#include <netinet/in.h>
51
52#include <ctype.h>
53#include <err.h>
54#include <netdb.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <unistd.h>
59
60#define	SYSLOG_NAMES
61#include <syslog.h>
62
63int	decode(char *, CODE *);
64int	pencode(char *);
65static void	logmessage(int, char *, char *);
66static void	usage(void);
67
68struct socks {
69    int sock;
70    int addrlen;
71    struct sockaddr_storage addr;
72};
73
74#ifdef INET6
75int	family = PF_UNSPEC;	/* protocol family (IPv4, IPv6 or both) */
76#else
77int	family = PF_INET;	/* protocol family (IPv4 only) */
78#endif
79int	send_to_all = 0;	/* send message to all IPv4/IPv6 addresses */
80
81/*
82 * logger -- read and log utility
83 *
84 *	Reads from an input and arranges to write the result on the system
85 *	log.
86 */
87int
88main(int argc, char *argv[])
89{
90	int ch, logflags, pri;
91	char *tag, *host, buf[1024];
92
93	tag = NULL;
94	host = NULL;
95	pri = LOG_USER | LOG_NOTICE;
96	logflags = 0;
97	unsetenv("TZ");
98	while ((ch = getopt(argc, argv, "46Af:h:ip:st:")) != -1)
99		switch((char)ch) {
100		case '4':
101			family = PF_INET;
102			break;
103#ifdef INET6
104		case '6':
105			family = PF_INET6;
106			break;
107#endif
108		case 'A':
109			send_to_all++;
110			break;
111		case 'f':		/* file to log */
112			if (freopen(optarg, "r", stdin) == NULL)
113				err(1, "%s", optarg);
114			break;
115		case 'h':		/* hostname to deliver to */
116			host = optarg;
117			break;
118		case 'i':		/* log process id also */
119			logflags |= LOG_PID;
120			break;
121		case 'p':		/* priority */
122			pri = pencode(optarg);
123			break;
124		case 's':		/* log to standard error */
125			logflags |= LOG_PERROR;
126			break;
127		case 't':		/* tag */
128			tag = optarg;
129			break;
130		case '?':
131		default:
132			usage();
133		}
134	argc -= optind;
135	argv += optind;
136
137	/* setup for logging */
138	openlog(tag ? tag : getlogin(), logflags, 0);
139	(void) fclose(stdout);
140
141	/* log input line if appropriate */
142	if (argc > 0) {
143		char *p, *endp;
144		size_t len;
145
146		for (p = buf, endp = buf + sizeof(buf) - 2; *argv;) {
147			len = strlen(*argv);
148			if (p + len > endp && p > buf) {
149				logmessage(pri, host, buf);
150				p = buf;
151			}
152			if (len > sizeof(buf) - 1)
153				logmessage(pri, host, *argv++);
154			else {
155				if (p != buf)
156					*p++ = ' ';
157				bcopy(*argv++, p, len);
158				*(p += len) = '\0';
159			}
160		}
161		if (p != buf)
162			logmessage(pri, host, buf);
163	} else
164		while (fgets(buf, sizeof(buf), stdin) != NULL)
165			logmessage(pri, host, buf);
166	exit(0);
167}
168
169/*
170 *  Send the message to syslog, either on the local host, or on a remote host
171 */
172void
173logmessage(int pri, char *host, char *buf)
174{
175	static struct socks *socks;
176	static int nsock = 0;
177	struct addrinfo hints, *res, *r;
178	char *line;
179	int maxs, len, sock, error, i, lsent;
180
181	if (host == NULL) {
182		syslog(pri, "%s", buf);
183		return;
184	}
185
186	if (nsock <= 0) {	/* set up socket stuff */
187		/* resolve hostname */
188		memset(&hints, 0, sizeof(hints));
189		hints.ai_family = family;
190		hints.ai_socktype = SOCK_DGRAM;
191		error = getaddrinfo(host, "syslog", &hints, &res);
192		if (error == EAI_SERVICE) {
193			warnx ("syslog/udp: unknown service");	/* not fatal */
194			error = getaddrinfo(host, "514", &hints, &res);
195		}
196		if (error)
197			errx(1, "%s: %s", gai_strerror(error), host);
198		/* count max number of sockets we may open */
199		for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
200		socks = malloc(maxs * sizeof(struct socks));
201		if (!socks)
202			errx(1, "couldn't allocate memory for sockets");
203		for (r = res; r; r = r->ai_next) {
204			sock = socket(r->ai_family, r->ai_socktype,
205				      r->ai_protocol);
206			if (sock < 0)
207				continue;
208			memcpy(&socks[nsock].addr, r->ai_addr, r->ai_addrlen);
209			socks[nsock].addrlen = r->ai_addrlen;
210			socks[nsock++].sock = sock;
211		}
212		freeaddrinfo(res);
213		if (nsock <= 0)
214			errx(1, "socket");
215	}
216
217	if ((len = asprintf(&line, "<%d>%s", pri, buf)) == -1)
218		errx(1, "asprintf");
219
220	for (i = 0; i < nsock; ++i) {
221		lsent = sendto(socks[i].sock, line, len, 0,
222			       (struct sockaddr *)&socks[i].addr,
223			       socks[i].addrlen);
224		if (lsent == len && !send_to_all)
225			break;
226	}
227	if (lsent != len) {
228		if (lsent == -1)
229			warn ("sendto");
230		else
231			warnx ("sendto: short send - %d bytes", lsent);
232	}
233
234	free(line);
235}
236
237/*
238 *  Decode a symbolic name to a numeric value
239 */
240int
241pencode(char *s)
242{
243	char *save;
244	int fac, lev;
245
246	for (save = s; *s && *s != '.'; ++s);
247	if (*s) {
248		*s = '\0';
249		fac = decode(save, facilitynames);
250		if (fac < 0)
251			errx(1, "unknown facility name: %s", save);
252		*s++ = '.';
253	}
254	else {
255		fac = 0;
256		s = save;
257	}
258	lev = decode(s, prioritynames);
259	if (lev < 0)
260		errx(1, "unknown priority name: %s", save);
261	return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
262}
263
264int
265decode(char *name, CODE *codetab)
266{
267	CODE *c;
268
269	if (isdigit(*name))
270		return (atoi(name));
271
272	for (c = codetab; c->c_name; c++)
273		if (!strcasecmp(name, c->c_name))
274			return (c->c_val);
275
276	return (-1);
277}
278
279static void
280usage(void)
281{
282	(void)fprintf(stderr, "usage: %s\n",
283	    "logger [-46Ais] [-f file] [-h host] [-p pri] [-t tag] [message ...]"
284	    );
285	exit(1);
286}
287