1 /* $OpenBSD: log.c,v 1.12 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
27 static int debug;
28 static int verbose;
29 const char *log_procname;
30
31 void log_init(int, int);
32 void log_procinit(const char *);
33 void log_setverbose(int);
34 int log_getverbose(void);
35 void log_warn(const char *, ...)
36 __attribute__((__format__ (printf, 1, 2)));
37 void log_warnx(const char *, ...)
38 __attribute__((__format__ (printf, 1, 2)));
39 void log_info(const char *, ...)
40 __attribute__((__format__ (printf, 1, 2)));
41 void log_debug(const char *, ...)
42 __attribute__((__format__ (printf, 1, 2)));
43 void logit(int, const char *, ...)
44 __attribute__((__format__ (printf, 2, 3)));
45 void 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
52 void
log_init(int n_debug,int facility)53 log_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
67 void
log_procinit(const char * procname)68 log_procinit(const char *procname)
69 {
70 if (procname != NULL)
71 log_procname = procname;
72 }
73
74 void
log_setverbose(int v)75 log_setverbose(int v)
76 {
77 verbose = v;
78 }
79
80 int
log_getverbose(void)81 log_getverbose(void)
82 {
83 return (verbose);
84 }
85
86 void
logit(int pri,const char * fmt,...)87 logit(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
96 void
vlog(int pri,const char * fmt,va_list ap)97 vlog(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
118 void
log_warn(const char * emsg,...)119 log_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
146 void
log_warnx(const char * emsg,...)147 log_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
156 void
log_info(const char * emsg,...)157 log_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
166 void
log_debug(const char * emsg,...)167 log_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
178 static void
vfatalc(int code,const char * emsg,va_list ap)179 vfatalc(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
198 void
fatal(const char * emsg,...)199 fatal(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
209 void
fatalx(const char * emsg,...)210 fatalx(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 }
219