1 /* $OpenBSD: log.c,v 1.9 2016/10/12 11:57:31 reyk 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 int debug; 28 int verbose; 29 const char *log_procname; 30 31 void log_init(int, int); 32 void log_procinit(const char *); 33 void log_verbose(int); 34 void log_warn(const char *, ...) 35 __attribute__((__format__ (printf, 1, 2))); 36 void log_warnx(const char *, ...) 37 __attribute__((__format__ (printf, 1, 2))); 38 void log_info(const char *, ...) 39 __attribute__((__format__ (printf, 1, 2))); 40 void log_debug(const char *, ...) 41 __attribute__((__format__ (printf, 1, 2))); 42 void logit(int, const char *, ...) 43 __attribute__((__format__ (printf, 2, 3))); 44 void vlog(int, const char *, va_list) 45 __attribute__((__format__ (printf, 2, 0))); 46 __dead void fatal(const char *, ...) 47 __attribute__((__format__ (printf, 1, 2))); 48 __dead void fatalx(const char *, ...) 49 __attribute__((__format__ (printf, 1, 2))); 50 51 void 52 log_init(int n_debug, int facility) 53 { 54 extern char *__progname; 55 56 debug = n_debug; 57 verbose = n_debug; 58 log_procinit(__progname); 59 60 if (!debug) 61 openlog(__progname, LOG_PID | LOG_NDELAY, facility); 62 63 tzset(); 64 } 65 66 void 67 log_procinit(const char *procname) 68 { 69 if (procname != NULL) 70 log_procname = procname; 71 } 72 73 void 74 log_verbose(int v) 75 { 76 verbose = v; 77 } 78 79 void 80 logit(int pri, const char *fmt, ...) 81 { 82 va_list ap; 83 84 va_start(ap, fmt); 85 vlog(pri, fmt, ap); 86 va_end(ap); 87 } 88 89 void 90 vlog(int pri, const char *fmt, va_list ap) 91 { 92 char *nfmt; 93 94 if (debug) { 95 /* best effort in out of mem situations */ 96 if (asprintf(&nfmt, "%s\n", fmt) == -1) { 97 vfprintf(stderr, fmt, ap); 98 fprintf(stderr, "\n"); 99 } else { 100 vfprintf(stderr, nfmt, ap); 101 free(nfmt); 102 } 103 fflush(stderr); 104 } else 105 vsyslog(pri, fmt, ap); 106 } 107 108 109 void 110 log_warn(const char *emsg, ...) 111 { 112 char *nfmt; 113 va_list ap; 114 int saved_errno = errno; 115 116 /* best effort to even work in out of memory situations */ 117 if (emsg == NULL) 118 logit(LOG_CRIT, "%s", strerror(saved_errno)); 119 else { 120 va_start(ap, emsg); 121 122 if (asprintf(&nfmt, "%s: %s", emsg, 123 strerror(saved_errno)) == -1) { 124 /* we tried it... */ 125 vlog(LOG_CRIT, emsg, ap); 126 logit(LOG_CRIT, "%s", strerror(saved_errno)); 127 } else { 128 vlog(LOG_CRIT, nfmt, ap); 129 free(nfmt); 130 } 131 va_end(ap); 132 } 133 } 134 135 void 136 log_warnx(const char *emsg, ...) 137 { 138 va_list ap; 139 140 va_start(ap, emsg); 141 vlog(LOG_CRIT, emsg, ap); 142 va_end(ap); 143 } 144 145 void 146 log_info(const char *emsg, ...) 147 { 148 va_list ap; 149 150 va_start(ap, emsg); 151 vlog(LOG_INFO, emsg, ap); 152 va_end(ap); 153 } 154 155 void 156 log_debug(const char *emsg, ...) 157 { 158 va_list ap; 159 160 if (verbose > 1) { 161 va_start(ap, emsg); 162 vlog(LOG_DEBUG, emsg, ap); 163 va_end(ap); 164 } 165 } 166 167 static void 168 vfatal(const char *emsg, va_list ap) 169 { 170 static char s[BUFSIZ]; 171 const char *sep; 172 int saved_errno = errno; 173 174 if (emsg != NULL) { 175 (void)vsnprintf(s, sizeof(s), emsg, ap); 176 sep = ": "; 177 } else { 178 s[0] = '\0'; 179 sep = ""; 180 } 181 if (saved_errno) 182 logit(LOG_CRIT, "%s: %s%s%s", 183 log_procname, s, sep, strerror(saved_errno)); 184 else 185 logit(LOG_CRIT, "%s%s%s", log_procname, sep, s); 186 } 187 188 void 189 fatal(const char *emsg, ...) 190 { 191 va_list ap; 192 193 va_start(ap, emsg); 194 vfatal(emsg, ap); 195 va_end(ap); 196 exit(1); 197 } 198 199 void 200 fatalx(const char *emsg, ...) 201 { 202 va_list ap; 203 204 errno = 0; 205 va_start(ap, emsg); 206 vfatal(emsg, ap); 207 va_end(ap); 208 exit(1); 209 } 210