1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2012 The FreeBSD Foundation 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 <sys/cdefs.h> 33 #include <errno.h> 34 #include <stdarg.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <syslog.h> 39 #include <vis.h> 40 41 #include "common.h" 42 43 static int log_level = 0; 44 static char *peer_name = NULL; 45 static char *peer_addr = NULL; 46 47 #define MSGBUF_LEN 1024 48 49 void 50 log_init(int level) 51 { 52 53 log_level = level; 54 openlog(getprogname(), LOG_NDELAY | LOG_PID, LOG_DAEMON); 55 } 56 57 void 58 log_set_peer_name(const char *name) 59 { 60 61 /* 62 * XXX: Turn it into assertion? 63 */ 64 if (peer_name != NULL) 65 log_errx(1, "%s called twice", __func__); 66 if (peer_addr == NULL) 67 log_errx(1, "%s called before log_set_peer_addr", __func__); 68 69 peer_name = checked_strdup(name); 70 } 71 72 void 73 log_set_peer_addr(const char *addr) 74 { 75 76 /* 77 * XXX: Turn it into assertion? 78 */ 79 if (peer_addr != NULL) 80 log_errx(1, "%s called twice", __func__); 81 82 peer_addr = checked_strdup(addr); 83 } 84 85 static void 86 log_common(int priority, int log_errno, const char *fmt, va_list ap) 87 { 88 static char msgbuf[MSGBUF_LEN]; 89 static char msgbuf_strvised[MSGBUF_LEN * 4 + 1]; 90 char *errstr; 91 int ret; 92 93 ret = vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap); 94 if (ret < 0) { 95 fprintf(stderr, "%s: snprintf failed", getprogname()); 96 syslog(LOG_CRIT, "snprintf failed"); 97 exit(1); 98 } 99 100 ret = strnvis(msgbuf_strvised, sizeof(msgbuf_strvised), msgbuf, VIS_NL); 101 if (ret < 0) { 102 fprintf(stderr, "%s: strnvis failed", getprogname()); 103 syslog(LOG_CRIT, "strnvis failed"); 104 exit(1); 105 } 106 107 if (log_errno == -1) { 108 if (peer_name != NULL) { 109 fprintf(stderr, "%s: %s (%s): %s\n", getprogname(), 110 peer_addr, peer_name, msgbuf_strvised); 111 syslog(priority, "%s (%s): %s", 112 peer_addr, peer_name, msgbuf_strvised); 113 } else if (peer_addr != NULL) { 114 fprintf(stderr, "%s: %s: %s\n", getprogname(), 115 peer_addr, msgbuf_strvised); 116 syslog(priority, "%s: %s", 117 peer_addr, msgbuf_strvised); 118 } else { 119 fprintf(stderr, "%s: %s\n", getprogname(), msgbuf_strvised); 120 syslog(priority, "%s", msgbuf_strvised); 121 } 122 123 } else { 124 errstr = strerror(log_errno); 125 126 if (peer_name != NULL) { 127 fprintf(stderr, "%s: %s (%s): %s: %s\n", getprogname(), 128 peer_addr, peer_name, msgbuf_strvised, errstr); 129 syslog(priority, "%s (%s): %s: %s", 130 peer_addr, peer_name, msgbuf_strvised, errstr); 131 } else if (peer_addr != NULL) { 132 fprintf(stderr, "%s: %s: %s: %s\n", getprogname(), 133 peer_addr, msgbuf_strvised, errstr); 134 syslog(priority, "%s: %s: %s", 135 peer_addr, msgbuf_strvised, errstr); 136 } else { 137 fprintf(stderr, "%s: %s: %s\n", getprogname(), 138 msgbuf_strvised, errstr); 139 syslog(priority, "%s: %s", 140 msgbuf_strvised, errstr); 141 } 142 } 143 } 144 145 void 146 log_err(int eval, const char *fmt, ...) 147 { 148 va_list ap; 149 150 va_start(ap, fmt); 151 log_common(LOG_CRIT, errno, fmt, ap); 152 va_end(ap); 153 154 exit(eval); 155 } 156 157 void 158 log_errx(int eval, const char *fmt, ...) 159 { 160 va_list ap; 161 162 va_start(ap, fmt); 163 log_common(LOG_CRIT, -1, fmt, ap); 164 va_end(ap); 165 166 exit(eval); 167 } 168 169 void 170 log_warn(const char *fmt, ...) 171 { 172 va_list ap; 173 174 va_start(ap, fmt); 175 log_common(LOG_WARNING, errno, fmt, ap); 176 va_end(ap); 177 } 178 179 void 180 log_warnx(const char *fmt, ...) 181 { 182 va_list ap; 183 184 va_start(ap, fmt); 185 log_common(LOG_WARNING, -1, fmt, ap); 186 va_end(ap); 187 } 188 189 void 190 log_debugx(const char *fmt, ...) 191 { 192 va_list ap; 193 194 if (log_level == 0) 195 return; 196 197 va_start(ap, fmt); 198 log_common(LOG_DEBUG, -1, fmt, ap); 199 va_end(ap); 200 } 201