logger.c revision 216370 
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 * 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
31static const char copyright[] =
32"@(#) Copyright (c) 1983, 1993\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#if 0
37#ifndef lint
38static char sccsid[] = "@(#)logger.c	8.1 (Berkeley) 6/6/93";
39#endif /* not lint */
40#endif
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: head/usr.bin/logger/logger.c 216370 2010-12-11 08:32:16Z joel $");
44
45#include <sys/types.h>
46#include <sys/socket.h>
47#include <netinet/in.h>
48
49#include <ctype.h>
50#include <err.h>
51#include <netdb.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <unistd.h>
56
57#define	SYSLOG_NAMES
58#include <syslog.h>
59
60int	decode(char *, CODE *);
61int	pencode(char *);
62static void	logmessage(int, const char *, const char *, const char *);
63static void	usage(void);
64
65struct socks {
66    int sock;
67    int addrlen;
68    struct sockaddr_storage addr;
69};
70
71#ifdef INET6
72int	family = PF_UNSPEC;	/* protocol family (IPv4, IPv6 or both) */
73#else
74int	family = PF_INET;	/* protocol family (IPv4 only) */
75#endif
76int	send_to_all = 0;	/* send message to all IPv4/IPv6 addresses */
77
78/*
79 * logger -- read and log utility
80 *
81 *	Reads from an input and arranges to write the result on the system
82 *	log.
83 */
84int
85main(int argc, char *argv[])
86{
87	int ch, logflags, pri;
88	char *tag, *host, buf[1024];
89	const char *svcname;
90
91	tag = NULL;
92	host = NULL;
93	svcname = "syslog";
94	pri = LOG_USER | LOG_NOTICE;
95	logflags = 0;
96	unsetenv("TZ");
97	while ((ch = getopt(argc, argv, "46Af:h:iP:p:st:")) != -1)
98		switch((char)ch) {
99		case '4':
100			family = PF_INET;
101			break;
102#ifdef INET6
103		case '6':
104			family = PF_INET6;
105			break;
106#endif
107		case 'A':
108			send_to_all++;
109			break;
110		case 'f':		/* file to log */
111			if (freopen(optarg, "r", stdin) == NULL)
112				err(1, "%s", optarg);
113			setvbuf(stdin, 0, _IONBF, 0);
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':		/* service name or port number */
122			svcname = optarg;
123			break;
124		case 'p':		/* priority */
125			pri = pencode(optarg);
126			break;
127		case 's':		/* log to standard error */
128			logflags |= LOG_PERROR;
129			break;
130		case 't':		/* tag */
131			tag = optarg;
132			break;
133		case '?':
134		default:
135			usage();
136		}
137	argc -= optind;
138	argv += optind;
139
140	/* setup for logging */
141	openlog(tag ? tag : getlogin(), logflags, 0);
142	(void) fclose(stdout);
143
144	/* log input line if appropriate */
145	if (argc > 0) {
146		char *p, *endp;
147		size_t len;
148
149		for (p = buf, endp = buf + sizeof(buf) - 2; *argv;) {
150			len = strlen(*argv);
151			if (p + len > endp && p > buf) {
152				logmessage(pri, host, svcname, buf);
153				p = buf;
154			}
155			if (len > sizeof(buf) - 1)
156				logmessage(pri, host, svcname, *argv++);
157			else {
158				if (p != buf)
159					*p++ = ' ';
160				bcopy(*argv++, p, len);
161				*(p += len) = '\0';
162			}
163		}
164		if (p != buf)
165			logmessage(pri, host, svcname, buf);
166	} else
167		while (fgets(buf, sizeof(buf), stdin) != NULL)
168			logmessage(pri, host, svcname, buf);
169	exit(0);
170}
171
172/*
173 *  Send the message to syslog, either on the local host, or on a remote host
174 */
175void
176logmessage(int pri, const char *host, const char *svcname, const char *buf)
177{
178	static struct socks *socks;
179	static int nsock = 0;
180	struct addrinfo hints, *res, *r;
181	char *line;
182	int maxs, len, sock, error, i, lsent;
183
184	if (host == NULL) {
185		syslog(pri, "%s", buf);
186		return;
187	}
188
189	if (nsock <= 0) {	/* set up socket stuff */
190		/* resolve hostname */
191		memset(&hints, 0, sizeof(hints));
192		hints.ai_family = family;
193		hints.ai_socktype = SOCK_DGRAM;
194		error = getaddrinfo(host, svcname, &hints, &res);
195		if (error == EAI_SERVICE) {
196			warnx("%s/udp: unknown service", svcname);
197			error = getaddrinfo(host, "514", &hints, &res);
198		}
199		if (error)
200			errx(1, "%s: %s", gai_strerror(error), host);
201		/* count max number of sockets we may open */
202		for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
203		socks = malloc(maxs * sizeof(struct socks));
204		if (!socks)
205			errx(1, "couldn't allocate memory for sockets");
206		for (r = res; r; r = r->ai_next) {
207			sock = socket(r->ai_family, r->ai_socktype,
208				      r->ai_protocol);
209			if (sock < 0)
210				continue;
211			memcpy(&socks[nsock].addr, r->ai_addr, r->ai_addrlen);
212			socks[nsock].addrlen = r->ai_addrlen;
213			socks[nsock++].sock = sock;
214		}
215		freeaddrinfo(res);
216		if (nsock <= 0)
217			errx(1, "socket");
218	}
219
220	if ((len = asprintf(&line, "<%d>%s", pri, buf)) == -1)
221		errx(1, "asprintf");
222
223	lsent = -1;
224	for (i = 0; i < nsock; ++i) {
225		lsent = sendto(socks[i].sock, line, len, 0,
226			       (struct sockaddr *)&socks[i].addr,
227			       socks[i].addrlen);
228		if (lsent == len && !send_to_all)
229			break;
230	}
231	if (lsent != len) {
232		if (lsent == -1)
233			warn ("sendto");
234		else
235			warnx ("sendto: short send - %d bytes", lsent);
236	}
237
238	free(line);
239}
240
241/*
242 *  Decode a symbolic name to a numeric value
243 */
244int
245pencode(char *s)
246{
247	char *save;
248	int fac, lev;
249
250	for (save = s; *s && *s != '.'; ++s);
251	if (*s) {
252		*s = '\0';
253		fac = decode(save, facilitynames);
254		if (fac < 0)
255			errx(1, "unknown facility name: %s", save);
256		*s++ = '.';
257	}
258	else {
259		fac = 0;
260		s = save;
261	}
262	lev = decode(s, prioritynames);
263	if (lev < 0)
264		errx(1, "unknown priority name: %s", save);
265	return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
266}
267
268int
269decode(char *name, CODE *codetab)
270{
271	CODE *c;
272
273	if (isdigit(*name))
274		return (atoi(name));
275
276	for (c = codetab; c->c_name; c++)
277		if (!strcasecmp(name, c->c_name))
278			return (c->c_val);
279
280	return (-1);
281}
282
283static void
284usage(void)
285{
286	(void)fprintf(stderr, "usage: %s\n",
287	    "logger [-46Ais] [-f file] [-h host] [-P port] [-p pri] [-t tag]\n"
288	    "              [message ...]"
289	    );
290	exit(1);
291}
292