errwarn.c revision 331722 
1/*	$OpenBSD: errwarn.c,v 1.7 2004/05/04 22:23:01 mickey Exp $	*/
2
3/* Errors and warnings... */
4
5/*
6 * Copyright (c) 1996 The Internet Software Consortium.
7 * All Rights Reserved.
8 * Copyright (c) 1995 RadioMail Corporation.  All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of RadioMail Corporation, the Internet Software
20 *    Consortium nor the names of its contributors may be used to endorse
21 *    or promote products derived from this software without specific
22 *    prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY RADIOMAIL CORPORATION, THE INTERNET
25 * SOFTWARE CONSORTIUM AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
27 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL RADIOMAIL CORPORATION OR CONTRIBUTORS
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
35 * OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * This software was written for RadioMail Corporation by Ted Lemon
38 * under a contract with Vixie Enterprises.   Further modifications have
39 * been made for the Internet Software Consortium under a contract
40 * with Vixie Laboratories.
41 */
42
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD: stable/11/sbin/dhclient/errwarn.c 331722 2018-03-29 02:50:57Z eadler $");
45
46#include <errno.h>
47
48#include "dhcpd.h"
49
50static void do_percentm(char *obuf, size_t size, char *ibuf);
51
52static char mbuf[1024];
53static char fbuf[1024];
54
55int warnings_occurred;
56
57/*
58 * Log an error message, then exit.
59 */
60void
61error(char *fmt, ...)
62{
63	va_list list;
64
65	do_percentm(fbuf, sizeof(fbuf), fmt);
66
67	va_start(list, fmt);
68	vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
69	va_end(list);
70
71#ifndef DEBUG
72	syslog(log_priority | LOG_ERR, "%s", mbuf);
73#endif
74
75	/* Also log it to stderr? */
76	if (log_perror) {
77		write(2, mbuf, strlen(mbuf));
78		write(2, "\n", 1);
79	}
80
81	syslog(LOG_CRIT, "exiting.");
82	if (log_perror) {
83		fprintf(stderr, "exiting.\n");
84		fflush(stderr);
85	}
86	if (pidfile != NULL)
87		pidfile_remove(pidfile);
88	exit(1);
89}
90
91/*
92 * Log a warning message...
93 */
94int
95warning(char *fmt, ...)
96{
97	va_list list;
98
99	do_percentm(fbuf, sizeof(fbuf), fmt);
100
101	va_start(list, fmt);
102	vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
103	va_end(list);
104
105#ifndef DEBUG
106	syslog(log_priority | LOG_ERR, "%s", mbuf);
107#endif
108
109	if (log_perror) {
110		write(2, mbuf, strlen(mbuf));
111		write(2, "\n", 1);
112	}
113
114	return (0);
115}
116
117/*
118 * Log a note...
119 */
120int
121note(char *fmt, ...)
122{
123	va_list list;
124
125	do_percentm(fbuf, sizeof(fbuf), fmt);
126
127	va_start(list, fmt);
128	vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
129	va_end(list);
130
131#ifndef DEBUG
132	syslog(log_priority | LOG_INFO, "%s", mbuf);
133#endif
134
135	if (log_perror) {
136		write(2, mbuf, strlen(mbuf));
137		write(2, "\n", 1);
138	}
139
140	return (0);
141}
142
143/*
144 * Log a debug message...
145 */
146int
147debug(char *fmt, ...)
148{
149	va_list list;
150
151	do_percentm(fbuf, sizeof(fbuf), fmt);
152
153	va_start(list, fmt);
154	vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
155	va_end(list);
156
157#ifndef DEBUG
158	syslog(log_priority | LOG_DEBUG, "%s", mbuf);
159#endif
160
161	if (log_perror) {
162		write(2, mbuf, strlen(mbuf));
163		write(2, "\n", 1);
164	}
165
166	return (0);
167}
168
169/*
170 * Find %m in the input string and substitute an error message string.
171 */
172static void
173do_percentm(char *obuf, size_t size, char *ibuf)
174{
175	char ch;
176	char *s = ibuf;
177	char *t = obuf;
178	size_t prlen;
179	size_t fmt_left;
180	int saved_errno = errno;
181
182	/*
183	 * We wouldn't need this mess if printf handled %m, or if
184	 * strerror() had been invented before syslog().
185	 */
186	for (fmt_left = size; (ch = *s); ++s) {
187		if (ch == '%' && s[1] == 'm') {
188			++s;
189			prlen = snprintf(t, fmt_left, "%s",
190			    strerror(saved_errno));
191			if (prlen >= fmt_left)
192				prlen = fmt_left - 1;
193			t += prlen;
194			fmt_left -= prlen;
195		} else {
196			if (fmt_left > 1) {
197				*t++ = ch;
198				fmt_left--;
199			}
200		}
201	}
202	*t = '\0';
203}
204
205int
206parse_warn(char *fmt, ...)
207{
208	va_list list;
209	static char spaces[] =
210	    "                                        "
211	    "                                        "; /* 80 spaces */
212
213	do_percentm(mbuf, sizeof(mbuf), fmt);
214	snprintf(fbuf, sizeof(fbuf), "%s line %d: %s", tlname, lexline, mbuf);
215	va_start(list, fmt);
216	vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
217	va_end(list);
218
219#ifndef DEBUG
220	syslog(log_priority | LOG_ERR, "%s", mbuf);
221	syslog(log_priority | LOG_ERR, "%s", token_line);
222	if (lexline < 81)
223		syslog(log_priority | LOG_ERR,
224		    "%s^", &spaces[sizeof(spaces) - lexchar]);
225#endif
226
227	if (log_perror) {
228		write(2, mbuf, strlen(mbuf));
229		write(2, "\n", 1);
230		write(2, token_line, strlen(token_line));
231		write(2, "\n", 1);
232		write(2, spaces, lexchar - 1);
233		write(2, "^\n", 2);
234	}
235
236	warnings_occurred = 1;
237
238	return (0);
239}
240