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 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 48 log_verbose(int v) 49 { 50 verbose = v; 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 void 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 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 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 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 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 156 fatalx(const char *emsg) 157 { 158 errno = 0; 159 fatal(emsg); 160 } 161