1 /*- 2 * Copyright (c) 2016 The DragonFly Project 3 * Copyright (c) 2012 The FreeBSD Foundation 4 * All rights reserved. 5 * 6 * This software was developed by Edward Tomasz Napierala under sponsorship 7 * from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 */ 31 32 #include <errno.h> 33 #include <stdarg.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <syslog.h> 38 #include <vis.h> 39 40 #include "common.h" 41 42 static int log_level = 0; 43 static char *peer_name = NULL; 44 static char *peer_addr = NULL; 45 46 #define MSGBUF_LEN 1024 47 48 void 49 log_init(int level) 50 { 51 52 log_level = level; 53 openlog(getprogname(), LOG_NDELAY | LOG_PID, LOG_DAEMON); 54 } 55 56 void 57 log_set_peer_name(const char *name) 58 { 59 60 /* 61 * XXX: Turn it into assertion? 62 */ 63 if (peer_name != NULL) 64 log_errx(1, "%s called twice", __func__); 65 if (peer_addr == NULL) 66 log_errx(1, "%s called before log_set_peer_addr", __func__); 67 68 peer_name = checked_strdup(name); 69 } 70 71 void 72 log_set_peer_addr(const char *addr) 73 { 74 75 /* 76 * XXX: Turn it into assertion? 77 */ 78 if (peer_addr != NULL) 79 log_errx(1, "%s called twice", __func__); 80 81 peer_addr = checked_strdup(addr); 82 } 83 84 static void 85 log_common(int priority, int log_errno, const char *fmt, va_list ap) 86 { 87 static char msgbuf[MSGBUF_LEN]; 88 static char msgbuf_strvised[MSGBUF_LEN * 4 + 1]; 89 char *errstr; 90 int ret; 91 92 ret = vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap); 93 if (ret < 0) { 94 fprintf(stderr, "%s: snprintf failed", getprogname()); 95 syslog(LOG_CRIT, "snprintf failed"); 96 exit(1); 97 } 98 99 ret = strnvis(msgbuf_strvised, msgbuf, sizeof(msgbuf_strvised), VIS_NL); 100 if (ret < 0) { 101 fprintf(stderr, "%s: strnvis failed", getprogname()); 102 syslog(LOG_CRIT, "strnvis failed"); 103 exit(1); 104 } 105 106 if (log_errno == -1) { 107 if (peer_name != NULL) { 108 fprintf(stderr, "%s: %s (%s): %s\n", getprogname(), 109 peer_addr, peer_name, msgbuf_strvised); 110 syslog(priority, "%s (%s): %s", 111 peer_addr, peer_name, msgbuf_strvised); 112 } else if (peer_addr != NULL) { 113 fprintf(stderr, "%s: %s: %s\n", getprogname(), 114 peer_addr, msgbuf_strvised); 115 syslog(priority, "%s: %s", 116 peer_addr, msgbuf_strvised); 117 } else { 118 fprintf(stderr, "%s: %s\n", getprogname(), msgbuf_strvised); 119 syslog(priority, "%s", msgbuf_strvised); 120 } 121 122 } else { 123 errstr = strerror(log_errno); 124 125 if (peer_name != NULL) { 126 fprintf(stderr, "%s: %s (%s): %s: %s\n", getprogname(), 127 peer_addr, peer_name, msgbuf_strvised, errstr); 128 syslog(priority, "%s (%s): %s: %s", 129 peer_addr, peer_name, msgbuf_strvised, errstr); 130 } else if (peer_addr != NULL) { 131 fprintf(stderr, "%s: %s: %s: %s\n", getprogname(), 132 peer_addr, msgbuf_strvised, errstr); 133 syslog(priority, "%s: %s: %s", 134 peer_addr, msgbuf_strvised, errstr); 135 } else { 136 fprintf(stderr, "%s: %s: %s\n", getprogname(), 137 msgbuf_strvised, errstr); 138 syslog(priority, "%s: %s", 139 msgbuf_strvised, errstr); 140 } 141 } 142 } 143 144 void 145 log_err(int eval, const char *fmt, ...) 146 { 147 va_list ap; 148 149 va_start(ap, fmt); 150 log_common(LOG_CRIT, errno, fmt, ap); 151 va_end(ap); 152 153 exit(eval); 154 } 155 156 void 157 log_errx(int eval, const char *fmt, ...) 158 { 159 va_list ap; 160 161 va_start(ap, fmt); 162 log_common(LOG_CRIT, -1, fmt, ap); 163 va_end(ap); 164 165 exit(eval); 166 } 167 168 void 169 log_warn(const char *fmt, ...) 170 { 171 va_list ap; 172 173 va_start(ap, fmt); 174 log_common(LOG_WARNING, errno, fmt, ap); 175 va_end(ap); 176 } 177 178 void 179 log_warnx(const char *fmt, ...) 180 { 181 va_list ap; 182 183 va_start(ap, fmt); 184 log_common(LOG_WARNING, -1, fmt, ap); 185 va_end(ap); 186 } 187 188 void 189 log_debugx(const char *fmt, ...) 190 { 191 va_list ap; 192 193 if (log_level == 0) 194 return; 195 196 va_start(ap, fmt); 197 log_common(LOG_DEBUG, -1, fmt, ap); 198 va_end(ap); 199 } 200