1 /* $OpenBSD: log.c,v 1.2 2006/12/16 17:48:27 deraadt 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 MIND, USE, DATA OR PROFITS, WHETHER 15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 16 * OUT OF 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 26 /* prototypes */ 27 void log_init(int); 28 void vlog(int, const char *, va_list); 29 void log_warn(const char *, ...); 30 void log_warnx(const char *, ...); 31 void log_info(const char *, ...); 32 void log_debug(const char *, ...); 33 void fatal(const char *); 34 void fatalx(const char *); 35 36 int debug; 37 38 void logit(int, const char *, ...); 39 40 void 41 log_init(int n_debug) 42 { 43 extern char *__progname; 44 45 debug = n_debug; 46 47 if (!debug) 48 openlog(__progname, LOG_PID | LOG_NDELAY, LOG_DAEMON); 49 50 tzset(); 51 } 52 53 void 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 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 83 void 84 log_warn(const char *emsg, ...) 85 { 86 char *nfmt; 87 va_list ap; 88 89 /* best effort to even work in out of memory situations */ 90 if (emsg == NULL) 91 logit(LOG_CRIT, "%s", strerror(errno)); 92 else { 93 va_start(ap, emsg); 94 95 if (asprintf(&nfmt, "%s: %s", emsg, strerror(errno)) == -1) { 96 /* we tried it... */ 97 vlog(LOG_CRIT, emsg, ap); 98 logit(LOG_CRIT, "%s", strerror(errno)); 99 } else { 100 vlog(LOG_CRIT, nfmt, ap); 101 free(nfmt); 102 } 103 va_end(ap); 104 } 105 } 106 107 void 108 log_warnx(const char *emsg, ...) 109 { 110 va_list ap; 111 112 va_start(ap, emsg); 113 vlog(LOG_CRIT, emsg, ap); 114 va_end(ap); 115 } 116 117 void 118 log_info(const char *emsg, ...) 119 { 120 va_list ap; 121 122 va_start(ap, emsg); 123 vlog(LOG_INFO, emsg, ap); 124 va_end(ap); 125 } 126 127 void 128 log_debug(const char *emsg, ...) 129 { 130 va_list ap; 131 132 if (debug) { 133 va_start(ap, emsg); 134 vlog(LOG_DEBUG, emsg, ap); 135 va_end(ap); 136 } 137 } 138 139 void 140 fatal(const char *emsg) 141 { 142 if (emsg == NULL) 143 logit(LOG_CRIT, "fatal: %s", strerror(errno)); 144 else 145 if (errno) 146 logit(LOG_CRIT, "fatal: %s: %s", 147 emsg, strerror(errno)); 148 else 149 logit(LOG_CRIT, "fatal: %s", emsg); 150 151 exit(1); 152 } 153 154 void 155 fatalx(const char *emsg) 156 { 157 errno = 0; 158 fatal(emsg); 159 } 160