1 /* $OpenBSD: log.c,v 1.12 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 <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 #include "log.h" 28 29 static int debug; 30 static int verbose; 31 static const char *log_procname; 32 33 void 34 log_init(int n_debug, int facility) 35 { 36 extern char *__progname; 37 38 debug = n_debug; 39 verbose = n_debug; 40 log_procinit(__progname); 41 42 if (!debug) 43 openlog(__progname, LOG_PID | LOG_NDELAY, facility); 44 45 tzset(); 46 } 47 48 void 49 log_procinit(const char *procname) 50 { 51 if (procname != NULL) 52 log_procname = procname; 53 } 54 55 void 56 log_setverbose(int v) 57 { 58 verbose = v; 59 } 60 61 int 62 log_getverbose(void) 63 { 64 return (verbose); 65 } 66 67 void 68 logit(int pri, const char *fmt, ...) 69 { 70 va_list ap; 71 72 va_start(ap, fmt); 73 vlog(pri, fmt, ap); 74 va_end(ap); 75 } 76 77 void 78 vlog(int pri, const char *fmt, va_list ap) 79 { 80 char *nfmt; 81 int saved_errno = errno; 82 83 if (debug) { 84 /* best effort in out of mem situations */ 85 if (asprintf(&nfmt, "%s\n", fmt) == -1) { 86 vfprintf(stderr, fmt, ap); 87 fprintf(stderr, "\n"); 88 } else { 89 vfprintf(stderr, nfmt, ap); 90 free(nfmt); 91 } 92 fflush(stderr); 93 } else 94 vsyslog(pri, fmt, ap); 95 96 errno = saved_errno; 97 } 98 99 void 100 log_warn(const char *emsg, ...) 101 { 102 char *nfmt; 103 va_list ap; 104 int saved_errno = errno; 105 106 /* best effort to even work in out of memory situations */ 107 if (emsg == NULL) 108 logit(LOG_ERR, "%s", strerror(saved_errno)); 109 else { 110 va_start(ap, emsg); 111 112 if (asprintf(&nfmt, "%s: %s", emsg, 113 strerror(saved_errno)) == -1) { 114 /* we tried it... */ 115 vlog(LOG_ERR, emsg, ap); 116 logit(LOG_ERR, "%s", strerror(saved_errno)); 117 } else { 118 vlog(LOG_ERR, nfmt, ap); 119 free(nfmt); 120 } 121 va_end(ap); 122 } 123 124 errno = saved_errno; 125 } 126 127 void 128 log_warnx(const char *emsg, ...) 129 { 130 va_list ap; 131 132 va_start(ap, emsg); 133 vlog(LOG_ERR, emsg, ap); 134 va_end(ap); 135 } 136 137 void 138 log_info(const char *emsg, ...) 139 { 140 va_list ap; 141 142 va_start(ap, emsg); 143 vlog(LOG_INFO, emsg, ap); 144 va_end(ap); 145 } 146 147 void 148 log_debug(const char *emsg, ...) 149 { 150 va_list ap; 151 152 if (verbose) { 153 va_start(ap, emsg); 154 vlog(LOG_DEBUG, emsg, ap); 155 va_end(ap); 156 } 157 } 158 159 static void 160 vfatalc(int code, const char *emsg, va_list ap) 161 { 162 static char s[BUFSIZ]; 163 const char *sep; 164 165 if (emsg != NULL) { 166 (void)vsnprintf(s, sizeof(s), emsg, ap); 167 sep = ": "; 168 } else { 169 s[0] = '\0'; 170 sep = ""; 171 } 172 if (code) 173 logit(LOG_CRIT, "fatal in %s: %s%s%s", 174 log_procname, s, sep, strerror(code)); 175 else 176 logit(LOG_CRIT, "fatal in %s%s%s", log_procname, sep, s); 177 } 178 179 void 180 fatal(const char *emsg, ...) 181 { 182 va_list ap; 183 184 va_start(ap, emsg); 185 vfatalc(errno, emsg, ap); 186 va_end(ap); 187 exit(1); 188 } 189 190 void 191 fatalx(const char *emsg, ...) 192 { 193 va_list ap; 194 195 va_start(ap, emsg); 196 vfatalc(0, emsg, ap); 197 va_end(ap); 198 exit(1); 199 } 200