1 /* $OpenBSD: log.c,v 1.4 2017/03/21 12:06:56 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 <errno.h>
20 #include <stdarg.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <syslog.h>
25 #include <time.h>
26 #include <unistd.h>
27
28 #include "log.h"
29
30 int debug;
31 int verbose;
32 const char *log_procname;
33
34 void
log_init(int n_debug)35 log_init(int n_debug)
36 {
37 extern char *__progname;
38
39 debug = n_debug;
40
41 if (!debug)
42 openlog(__progname, LOG_PID | LOG_NDELAY, LOG_DAEMON);
43
44 tzset();
45 }
46
47 void
log_verbose(int v)48 log_verbose(int v)
49 {
50 verbose = v;
51 }
52
53 void
logit(int pri,const char * fmt,...)54 logit(int pri, const char *fmt, ...)
55 {
56 va_list ap;
57
58 va_start(ap, fmt);
59 vlog(pri, fmt, ap);
60 va_end(ap);
61 }
62
63 void
vlog(int pri,const char * fmt,va_list ap)64 vlog(int pri, const char *fmt, va_list ap)
65 {
66 char *nfmt;
67
68 if (debug) {
69 /* best effort in out of mem situations */
70 if (asprintf(&nfmt, "%s\n", fmt) == -1) {
71 vfprintf(stderr, fmt, ap);
72 fprintf(stderr, "\n");
73 } else {
74 vfprintf(stderr, nfmt, ap);
75 free(nfmt);
76 }
77 fflush(stderr);
78 } else
79 vsyslog(pri, fmt, ap);
80 }
81
82 void
log_warn(const char * emsg,...)83 log_warn(const char *emsg, ...)
84 {
85 char *nfmt;
86 va_list ap;
87
88 /* best effort to even work in out of memory situations */
89 if (emsg == NULL)
90 logit(LOG_ERR, "%s", strerror(errno));
91 else {
92 va_start(ap, emsg);
93
94 if (asprintf(&nfmt, "%s: %s", emsg, strerror(errno)) == -1) {
95 /* we tried it... */
96 vlog(LOG_ERR, emsg, ap);
97 logit(LOG_ERR, "%s", strerror(errno));
98 } else {
99 vlog(LOG_ERR, nfmt, ap);
100 free(nfmt);
101 }
102 va_end(ap);
103 }
104 }
105
106 void
log_warnx(const char * emsg,...)107 log_warnx(const char *emsg, ...)
108 {
109 va_list ap;
110
111 va_start(ap, emsg);
112 vlog(LOG_ERR, emsg, ap);
113 va_end(ap);
114 }
115
116 void
log_info(const char * emsg,...)117 log_info(const char *emsg, ...)
118 {
119 va_list ap;
120
121 va_start(ap, emsg);
122 vlog(LOG_INFO, emsg, ap);
123 va_end(ap);
124 }
125
126 void
log_debug(const char * emsg,...)127 log_debug(const char *emsg, ...)
128 {
129 va_list ap;
130
131 if (verbose) {
132 va_start(ap, emsg);
133 vlog(LOG_DEBUG, emsg, ap);
134 va_end(ap);
135 }
136 }
137
138 void
fatal(const char * emsg)139 fatal(const char *emsg)
140 {
141 if (emsg == NULL)
142 logit(LOG_CRIT, "fatal in %s: %s", log_procname,
143 strerror(errno));
144 else
145 if (errno)
146 logit(LOG_CRIT, "fatal in %s: %s: %s",
147 log_procname, emsg, strerror(errno));
148 else
149 logit(LOG_CRIT, "fatal in %s: %s",
150 log_procname, emsg);
151
152 exit(1);
153 }
154
155 void
fatalx(const char * emsg)156 fatalx(const char *emsg)
157 {
158 errno = 0;
159 fatal(emsg);
160 }
161