1 /* $OpenBSD: log.c,v 1.4 2017/07/28 13:05:21 florian 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 <err.h> 20 #include <errno.h> 21 #include <netdb.h> 22 #include <stdarg.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <syslog.h> 27 #include <time.h> 28 #include <unistd.h> 29 30 #include "log.h" 31 32 static int debug; 33 34 static char *logqueue; 35 36 #define LOGQUEUE_SIZE 1024 37 38 void logit(int, const char *, ...); 39 void vlog(int pri, const char *fmt, va_list ap); 40 41 void 42 log_init(int n_debug) 43 { 44 extern char *__progname; 45 46 if (logqueue == NULL) { 47 logqueue = calloc(LOGQUEUE_SIZE, 1); 48 if (logqueue == NULL) 49 err(1, NULL); 50 } 51 52 debug = n_debug; 53 54 if (!debug) 55 openlog(__progname, LOG_PID | LOG_NDELAY, LOG_DAEMON); 56 57 tzset(); 58 } 59 60 void 61 logit(int pri, const char *fmt, ...) 62 { 63 va_list ap; 64 65 va_start(ap, fmt); 66 vlog(pri, fmt, ap); 67 va_end(ap); 68 } 69 70 void 71 log_enqueue(const char *fmt, ...) 72 { 73 char tmpbuf[LOGQUEUE_SIZE]; 74 va_list ap; 75 76 va_start(ap, fmt); 77 (void)vsnprintf(tmpbuf, sizeof(tmpbuf), fmt, ap); 78 va_end(ap); 79 (void)strlcat(logqueue, tmpbuf, LOGQUEUE_SIZE); 80 } 81 82 83 void 84 vlog(int pri, const char *fmt, va_list ap) 85 { 86 char tmpbuf[1024]; 87 char logbuf[LOGQUEUE_SIZE + sizeof(tmpbuf)]; 88 89 if (pri == LOG_DEBUG && !debug) { 90 logqueue[0] = '\0'; 91 return; 92 } 93 94 (void)vsnprintf(tmpbuf, sizeof(tmpbuf), fmt, ap); 95 (void)strlcpy(logbuf, logqueue, sizeof(logbuf)); 96 (void)strlcat(logbuf, tmpbuf, sizeof(logbuf)); 97 98 logqueue[0] = '\0'; 99 100 if (debug) { 101 fprintf(stderr, "%s\n", logbuf); 102 fflush(stderr); 103 } else 104 syslog(pri, "%s", logbuf); 105 } 106 107 void 108 log_warn(const char *emsg, ...) 109 { 110 char *nfmt; 111 va_list ap; 112 113 if (emsg == NULL) 114 logit(LOG_ERR, "%s", strerror(errno)); 115 else { 116 va_start(ap, emsg); 117 118 /* best effort to even work in out of memory situations */ 119 if (asprintf(&nfmt, "%s: %s", emsg, strerror(errno)) == -1) { 120 /* we tried it... */ 121 vlog(LOG_ERR, emsg, ap); 122 logit(LOG_ERR, "%s", strerror(errno)); 123 } else { 124 vlog(LOG_ERR, nfmt, ap); 125 free(nfmt); 126 } 127 va_end(ap); 128 } 129 } 130 131 void 132 log_warnx(const char *emsg, ...) 133 { 134 va_list ap; 135 136 va_start(ap, emsg); 137 vlog(LOG_ERR, emsg, ap); 138 va_end(ap); 139 } 140 141 void 142 log_info(const char *emsg, ...) 143 { 144 va_list ap; 145 146 va_start(ap, emsg); 147 vlog(LOG_INFO, emsg, ap); 148 va_end(ap); 149 } 150 151 void 152 log_debug(const char *emsg, ...) 153 { 154 va_list ap; 155 156 va_start(ap, emsg); 157 vlog(LOG_DEBUG, emsg, ap); 158 va_end(ap); 159 } 160 161 void 162 fatal(const char *emsg) 163 { 164 extern char *__progname; 165 extern __dead void rtdexit(void); 166 167 if (emsg == NULL) 168 logit(LOG_CRIT, "fatal in %s: %s", __progname, 169 strerror(errno)); 170 else 171 if (errno) 172 logit(LOG_CRIT, "fatal in %s: %s: %s", 173 __progname, emsg, strerror(errno)); 174 else 175 logit(LOG_CRIT, "fatal in %s: %s", 176 __progname, emsg); 177 178 rtdexit(); 179 } 180 181 void 182 fatalx(const char *emsg) 183 { 184 errno = 0; 185 fatal(emsg); 186 } 187