1 /* $OpenBSD: log.c,v 1.9 2023/09/26 01:53:54 dv 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 "proc.h" 28 29 static int debug; 30 static int verbose; 31 static char log_procname[2048]; 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("%s", __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 *fmt, ...) 50 { 51 va_list ap; 52 va_start(ap, fmt); 53 vsnprintf(log_procname, sizeof(log_procname), fmt, ap); 54 va_end(ap); 55 } 56 57 void 58 log_setverbose(int v) 59 { 60 verbose = v; 61 } 62 63 int 64 log_getverbose(void) 65 { 66 return (verbose); 67 } 68 69 void 70 logit(int pri, const char *fmt, ...) 71 { 72 va_list ap; 73 74 va_start(ap, fmt); 75 vlog(pri, fmt, ap); 76 va_end(ap); 77 } 78 79 void 80 vlog(int pri, const char *fmt, va_list ap) 81 { 82 char *nfmt; 83 int saved_errno = errno; 84 85 if (debug) { 86 /* best effort in out of mem situations */ 87 if (asprintf(&nfmt, "%s: %s\n", log_procname, fmt) == -1) { 88 vfprintf(stderr, fmt, ap); 89 fprintf(stderr, "\n"); 90 } else { 91 vfprintf(stderr, nfmt, ap); 92 free(nfmt); 93 } 94 fflush(stderr); 95 } else 96 vsyslog(pri, fmt, ap); 97 98 errno = saved_errno; 99 } 100 101 void 102 log_warn(const char *emsg, ...) 103 { 104 char *nfmt; 105 va_list ap; 106 int saved_errno = errno; 107 108 /* best effort to even work in out of memory situations */ 109 if (emsg == NULL) 110 logit(LOG_ERR, "%s", strerror(saved_errno)); 111 else { 112 va_start(ap, emsg); 113 114 if (asprintf(&nfmt, "%s: %s", emsg, 115 strerror(saved_errno)) == -1) { 116 /* we tried it... */ 117 vlog(LOG_ERR, emsg, ap); 118 logit(LOG_ERR, "%s", strerror(saved_errno)); 119 } else { 120 vlog(LOG_ERR, nfmt, ap); 121 free(nfmt); 122 } 123 va_end(ap); 124 } 125 126 errno = saved_errno; 127 } 128 129 void 130 log_warnx(const char *emsg, ...) 131 { 132 va_list ap; 133 134 va_start(ap, emsg); 135 vlog(LOG_ERR, emsg, ap); 136 va_end(ap); 137 } 138 139 void 140 log_info(const char *emsg, ...) 141 { 142 va_list ap; 143 144 va_start(ap, emsg); 145 vlog(LOG_INFO, emsg, ap); 146 va_end(ap); 147 } 148 149 void 150 log_debug(const char *emsg, ...) 151 { 152 va_list ap; 153 154 if (verbose > 1) { 155 va_start(ap, emsg); 156 vlog(LOG_DEBUG, emsg, ap); 157 va_end(ap); 158 } 159 } 160 161 static void 162 vfatalc(int code, const char *emsg, va_list ap) 163 { 164 static char s[BUFSIZ]; 165 const char *sep; 166 167 if (emsg != NULL) { 168 (void)vsnprintf(s, sizeof(s), emsg, ap); 169 sep = ": "; 170 } else { 171 s[0] = '\0'; 172 sep = ""; 173 } 174 if (code) 175 logit(LOG_CRIT, "%s: %s%s%s", 176 log_procname, s, sep, strerror(code)); 177 else 178 logit(LOG_CRIT, "%s%s%s", log_procname, sep, s); 179 } 180 181 void 182 fatal(const char *emsg, ...) 183 { 184 va_list ap; 185 186 va_start(ap, emsg); 187 vfatalc(errno, emsg, ap); 188 va_end(ap); 189 exit(1); 190 } 191 192 void 193 fatalx(const char *emsg, ...) 194 { 195 va_list ap; 196 197 va_start(ap, emsg); 198 vfatalc(0, emsg, ap); 199 va_end(ap); 200 exit(1); 201 } 202