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1/* $OpenBSD: log.c,v 1.14 2017/03/21 12:06:55 bluhm Exp $ */
2
3/*
4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <stdio.h>
20#include <stdlib.h>
21#include <stdarg.h>
22#include <string.h>
23#include <syslog.h>
24#include <errno.h>
25#include <time.h>
26
27static int debug;
28static int verbose;
29const char *log_procname;
30
31void log_init(int, int);
32void log_procinit(const char *);
33void log_setverbose(int);
34int log_getverbose(void);
35void log_warn(const char *, ...)
36 __attribute__((__format__ (printf, 1, 2)));
37void log_warnx(const char *, ...)
38 __attribute__((__format__ (printf, 1, 2)));
39void log_info(const char *, ...)
40 __attribute__((__format__ (printf, 1, 2)));
41void log_debug(const char *, ...)
42 __attribute__((__format__ (printf, 1, 2)));
43void logit(int, const char *, ...)
44 __attribute__((__format__ (printf, 2, 3)));
45void vlog(int, const char *, va_list)
46 __attribute__((__format__ (printf, 2, 0)));
47__dead void fatal(const char *, ...)
48 __attribute__((__format__ (printf, 1, 2)));
49__dead void fatalx(const char *, ...)
50 __attribute__((__format__ (printf, 1, 2)));
51
52void
53log_init(int n_debug, int facility)
54{
55 extern char *__progname;
56
57 debug = n_debug;
58 verbose = n_debug;
59 log_procinit(__progname);
60
61 if (!debug)
62 openlog(__progname, LOG_PID | LOG_NDELAY, facility);
63
64 tzset();
65}
66
67void
68log_procinit(const char *procname)
69{
70 if (procname != NULL)
71 log_procname = procname;
72}
73
74void
75log_setverbose(int v)
76{
77 verbose = v;
78}
79
80int
81log_getverbose(void)
82{
83 return (verbose);
84}
85
86void
87logit(int pri, const char *fmt, ...)
88{
89 va_list ap;
90
91 va_start(ap, fmt);
92 vlog(pri, fmt, ap);
93 va_end(ap);
94}
95
96void
97vlog(int pri, const char *fmt, va_list ap)
98{
99 char *nfmt;
100 int saved_errno = errno;
101
102 if (debug) {
103 /* best effort in out of mem situations */
104 if (asprintf(&nfmt, "%s\n", fmt) == -1) {
105 vfprintf(stderr, fmt, ap);
106 fprintf(stderr, "\n");
107 } else {
108 vfprintf(stderr, nfmt, ap);
109 free(nfmt);
110 }
111 fflush(stderr);
112 } else
113 vsyslog(pri, fmt, ap);
114
115 errno = saved_errno;
116}
117
118void
119log_warn(const char *emsg, ...)
120{
121 char *nfmt;
122 va_list ap;
123 int saved_errno = errno;
124
125 /* best effort to even work in out of memory situations */
126 if (emsg == NULL)
127 logit(LOG_ERR, "%s", strerror(saved_errno));
128 else {
129 va_start(ap, emsg);
130
131 if (asprintf(&nfmt, "%s: %s", emsg,
132 strerror(saved_errno)) == -1) {
133 /* we tried it... */
134 vlog(LOG_ERR, emsg, ap);
135 logit(LOG_ERR, "%s", strerror(saved_errno));
136 } else {
137 vlog(LOG_ERR, nfmt, ap);
138 free(nfmt);
139 }
140 va_end(ap);
141 }
142
143 errno = saved_errno;
144}
145
146void
147log_warnx(const char *emsg, ...)
148{
149 va_list ap;
150
151 va_start(ap, emsg);
152 vlog(LOG_ERR, emsg, ap);
153 va_end(ap);
154}
155
156void
157log_info(const char *emsg, ...)
158{
159 va_list ap;
160
161 va_start(ap, emsg);
162 vlog(LOG_INFO, emsg, ap);
163 va_end(ap);
164}
165
166void
167log_debug(const char *emsg, ...)
168{
169 va_list ap;
170
171 if (verbose > 1) {
172 va_start(ap, emsg);
173 vlog(LOG_DEBUG, emsg, ap);
174 va_end(ap);
175 }
176}
177
178static void
179vfatalc(int code, const char *emsg, va_list ap)
180{
181 static char s[BUFSIZ];
182 const char *sep;
183
184 if (emsg != NULL) {
185 (void)vsnprintf(s, sizeof(s), emsg, ap);
186 sep = ": ";
187 } else {
188 s[0] = '\0';
189 sep = "";
190 }
191 if (code)
192 logit(LOG_CRIT, "%s: %s%s%s",
193 log_procname, s, sep, strerror(code));
194 else
195 logit(LOG_CRIT, "%s%s%s", log_procname, sep, s);
196}
197
198void
199fatal(const char *emsg, ...)
200{
201 va_list ap;
202
203 va_start(ap, emsg);
204 vfatalc(errno, emsg, ap);
205 va_end(ap);
206 exit(1);
207}
208
209void
210fatalx(const char *emsg, ...)
211{
212 va_list ap;
213
214 va_start(ap, emsg);
215 vfatalc(0, emsg, ap);
216 va_end(ap);
217 exit(1);
218}