1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2016 The DragonFly Project 5 * Copyright (c) 2012 The FreeBSD Foundation 6 * All rights reserved. 7 * 8 * This software was developed by Edward Tomasz Napierala under sponsorship 9 * from the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 */ 33 34 #include <errno.h> 35 #include <stdarg.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <syslog.h> 40 #include <vis.h> 41 42 #include "common.h" 43 44 static int log_level = 0; 45 static char *peer_name = NULL; 46 static char *peer_addr = NULL; 47 48 #define MSGBUF_LEN 1024 49 50 void 51 log_init(int level) 52 { 53 54 log_level = level; 55 openlog(getprogname(), LOG_NDELAY | LOG_PID, LOG_DAEMON); 56 } 57 58 void 59 log_set_peer_name(const char *name) 60 { 61 62 /* 63 * XXX: Turn it into assertion? 64 */ 65 if (peer_name != NULL) 66 log_errx(1, "%s called twice", __func__); 67 if (peer_addr == NULL) 68 log_errx(1, "%s called before log_set_peer_addr", __func__); 69 70 peer_name = checked_strdup(name); 71 } 72 73 void 74 log_set_peer_addr(const char *addr) 75 { 76 77 /* 78 * XXX: Turn it into assertion? 79 */ 80 if (peer_addr != NULL) 81 log_errx(1, "%s called twice", __func__); 82 83 peer_addr = checked_strdup(addr); 84 } 85 86 static void 87 log_common(int priority, int log_errno, const char *fmt, va_list ap) 88 { 89 static char msgbuf[MSGBUF_LEN]; 90 static char msgbuf_strvised[MSGBUF_LEN * 4 + 1]; 91 char *errstr; 92 int ret; 93 94 ret = vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap); 95 if (ret < 0) { 96 fprintf(stderr, "%s: snprintf failed", getprogname()); 97 syslog(LOG_CRIT, "snprintf failed"); 98 exit(1); 99 } 100 101 ret = strnvis(msgbuf_strvised, msgbuf, sizeof(msgbuf_strvised), VIS_NL); 102 if (ret < 0) { 103 fprintf(stderr, "%s: strnvis failed", getprogname()); 104 syslog(LOG_CRIT, "strnvis failed"); 105 exit(1); 106 } 107 108 if (log_errno == -1) { 109 if (peer_name != NULL) { 110 fprintf(stderr, "%s: %s (%s): %s\n", getprogname(), 111 peer_addr, peer_name, msgbuf_strvised); 112 syslog(priority, "%s (%s): %s", 113 peer_addr, peer_name, msgbuf_strvised); 114 } else if (peer_addr != NULL) { 115 fprintf(stderr, "%s: %s: %s\n", getprogname(), 116 peer_addr, msgbuf_strvised); 117 syslog(priority, "%s: %s", 118 peer_addr, msgbuf_strvised); 119 } else { 120 fprintf(stderr, "%s: %s\n", getprogname(), msgbuf_strvised); 121 syslog(priority, "%s", msgbuf_strvised); 122 } 123 124 } else { 125 errstr = strerror(log_errno); 126 127 if (peer_name != NULL) { 128 fprintf(stderr, "%s: %s (%s): %s: %s\n", getprogname(), 129 peer_addr, peer_name, msgbuf_strvised, errstr); 130 syslog(priority, "%s (%s): %s: %s", 131 peer_addr, peer_name, msgbuf_strvised, errstr); 132 } else if (peer_addr != NULL) { 133 fprintf(stderr, "%s: %s: %s: %s\n", getprogname(), 134 peer_addr, msgbuf_strvised, errstr); 135 syslog(priority, "%s: %s: %s", 136 peer_addr, msgbuf_strvised, errstr); 137 } else { 138 fprintf(stderr, "%s: %s: %s\n", getprogname(), 139 msgbuf_strvised, errstr); 140 syslog(priority, "%s: %s", 141 msgbuf_strvised, errstr); 142 } 143 } 144 } 145 146 void 147 log_err(int eval, const char *fmt, ...) 148 { 149 va_list ap; 150 151 va_start(ap, fmt); 152 log_common(LOG_CRIT, errno, fmt, ap); 153 va_end(ap); 154 155 exit(eval); 156 } 157 158 void 159 log_errx(int eval, const char *fmt, ...) 160 { 161 va_list ap; 162 163 va_start(ap, fmt); 164 log_common(LOG_CRIT, -1, fmt, ap); 165 va_end(ap); 166 167 exit(eval); 168 } 169 170 void 171 log_warn(const char *fmt, ...) 172 { 173 va_list ap; 174 175 va_start(ap, fmt); 176 log_common(LOG_WARNING, errno, fmt, ap); 177 va_end(ap); 178 } 179 180 void 181 log_warnx(const char *fmt, ...) 182 { 183 va_list ap; 184 185 va_start(ap, fmt); 186 log_common(LOG_WARNING, -1, fmt, ap); 187 va_end(ap); 188 } 189 190 void 191 log_debugx(const char *fmt, ...) 192 { 193 va_list ap; 194 195 if (log_level == 0) 196 return; 197 198 va_start(ap, fmt); 199 log_common(LOG_DEBUG, -1, fmt, ap); 200 va_end(ap); 201 } 202