1/*	$NetBSD: logger.c,v 1.16 2012/04/26 21:11:24 christos Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1983, 1993\
35 The Regents of the University of California.  All rights reserved.");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)logger.c	8.1 (Berkeley) 6/6/93";
41#endif
42__RCSID("$NetBSD: logger.c,v 1.16 2012/04/26 21:11:24 christos Exp $");
43#endif /* not lint */
44
45#include <errno.h>
46#include <unistd.h>
47#include <stdlib.h>
48#include <stdio.h>
49#include <ctype.h>
50#include <string.h>
51#include <err.h>
52
53#define	SYSLOG_NAMES
54#include <syslog.h>
55
56static int	decode(const char *, const CODE *);
57static int	pencode(char *);
58__dead static void	usage(void);
59
60/*
61 * logger -- read and log utility
62 *
63 *	Reads from an input and arranges to write the result on the system
64 *	log.
65 */
66int
67main(int argc, char *argv[])
68{
69	int ch, logflags, pri;
70	const char *tag;
71	const char *sd = "-";
72	const char *msgid = "-";
73	char buf[1024];
74
75	tag = NULL;
76	pri = LOG_NOTICE;
77	logflags = 0;
78	while ((ch = getopt(argc, argv, "cd:f:im:np:st:")) != -1)
79		switch((char)ch) {
80		case 'c':	/* log to console */
81			logflags |= LOG_CONS;
82			break;
83		case 'd':		/* structured data field */
84			sd = optarg;
85			break;
86		case 'f':		/* file to log */
87			if (freopen(optarg, "r", stdin) == NULL)
88				err(EXIT_FAILURE, "%s", optarg);
89			break;
90		case 'i':		/* log process id also */
91			logflags |= LOG_PID;
92			break;
93		case 'm':		/* msgid field */
94			msgid = optarg;
95			break;
96		case 'n':		/* open log file immediately */
97			logflags |= LOG_NDELAY;
98			break;
99		case 'p':		/* priority */
100			pri = pencode(optarg);
101			break;
102		case 's':		/* log to standard error */
103			logflags |= LOG_PERROR;
104			break;
105		case 't':		/* tag */
106			tag = optarg;
107			break;
108		case '?':
109		default:
110			usage();
111		}
112	argc -= optind;
113	argv += optind;
114
115	/* setup for logging */
116	openlog(tag != NULL ? tag : getlogin(), logflags, 0);
117	(void)fclose(stdout);
118
119	/* log input line if appropriate */
120	if (argc > 0) {
121		char *p, *endp;
122		size_t len;
123
124		for (p = buf, endp = buf + sizeof(buf) - 2; *argv != NULL;) {
125			len = strlen(*argv);
126			if (p + len > endp && p > buf) {
127				syslogp(pri, msgid, sd, "%s", buf);
128				p = buf;
129			}
130			if (len > sizeof(buf) - 1)
131				syslogp(pri, msgid, sd, "%s", *argv++);
132			else {
133				if (p != buf)
134					*p++ = ' ';
135				memmove(p, *argv++, len);
136				*(p += len) = '\0';
137			}
138		}
139		if (p != buf)
140			syslogp(pri, msgid, sd, "%s", buf);
141	} else	/* TODO: allow syslog-protocol messages from file/stdin
142		 *       but that will require parsing the line to split
143		 *       it into three fields.
144		 */
145		while (fgets(buf, sizeof(buf), stdin) != NULL)
146			syslogp(pri, msgid, sd, "%s", buf);
147
148	exit(EXIT_SUCCESS);
149	/* NOTREACHED */
150}
151
152/*
153 *  Decode a symbolic name to a numeric value
154 */
155static int
156pencode(char *s)
157{
158	char *save;
159	int fac, lev;
160
161	for (save = s; *s != '\0' && *s != '.'; ++s)
162		;
163	if (*s != '\0') {
164		*s = '\0';
165		fac = decode(save, facilitynames);
166		if (fac < 0)
167			errx(EXIT_FAILURE, "unknown facility name: %s", save);
168		*s++ = '.';
169	} else {
170		fac = 0;
171		s = save;
172	}
173	lev = decode(s, prioritynames);
174	if (lev < 0)
175		errx(EXIT_FAILURE, "unknown priority name: %s", s);
176	return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
177}
178
179static int
180decode(const char *name, const CODE *codetab)
181{
182	const CODE *c;
183
184	if (isdigit((unsigned char)*name))
185		return (atoi(name));
186
187	for (c = codetab; c->c_name != NULL; c++)
188		if (strcasecmp(name, c->c_name) == 0)
189			return (c->c_val);
190
191	return (-1);
192}
193
194static void
195usage(void)
196{
197
198	(void)fprintf(stderr,
199	    "Usage: %s [-cins] [-d SD] [-f file] [-m msgid] "
200	    "[-p pri] [-t tag] [message ...]\n",
201	    getprogname());
202	exit(EXIT_FAILURE);
203}
204