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 #include <errno.h> 32 #include <stdarg.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <syslog.h> 37 #include <vis.h> 38 39 #include "libiscsiutil.h" 40 41 static int log_level = 0; 42 static char *peer_name = NULL; 43 static char *peer_addr = NULL; 44 45 #define MSGBUF_LEN 1024 46 47 void 48 log_init(int level) 49 { 50 51 log_level = level; 52 openlog(getprogname(), LOG_NDELAY | LOG_PID, LOG_DAEMON); 53 } 54 55 void 56 log_set_peer_name(const char *name) 57 { 58 59 /* 60 * XXX: Turn it into assertion? 61 */ 62 if (peer_name != NULL) 63 log_errx(1, "%s called twice", __func__); 64 if (peer_addr == NULL) 65 log_errx(1, "%s called before log_set_peer_addr", __func__); 66 67 peer_name = checked_strdup(name); 68 } 69 70 void 71 log_set_peer_addr(const char *addr) 72 { 73 74 /* 75 * XXX: Turn it into assertion? 76 */ 77 if (peer_addr != NULL) 78 log_errx(1, "%s called twice", __func__); 79 80 peer_addr = checked_strdup(addr); 81 } 82 83 static void 84 log_common(int priority, int log_errno, const char *fmt, va_list ap) 85 { 86 static char msgbuf[MSGBUF_LEN]; 87 static char msgbuf_strvised[MSGBUF_LEN * 4 + 1]; 88 char *errstr; 89 int ret; 90 91 ret = vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap); 92 if (ret < 0) { 93 fprintf(stderr, "%s: snprintf failed", getprogname()); 94 syslog(LOG_CRIT, "snprintf failed"); 95 exit(1); 96 } 97 98 ret = strnvis(msgbuf_strvised, sizeof(msgbuf_strvised), msgbuf, VIS_NL); 99 if (ret < 0) { 100 fprintf(stderr, "%s: strnvis failed", getprogname()); 101 syslog(LOG_CRIT, "strnvis failed"); 102 exit(1); 103 } 104 105 if (log_errno == -1) { 106 if (peer_name != NULL) { 107 fprintf(stderr, "%s: %s (%s): %s\n", getprogname(), 108 peer_addr, peer_name, msgbuf_strvised); 109 syslog(priority, "%s (%s): %s", 110 peer_addr, peer_name, msgbuf_strvised); 111 } else if (peer_addr != NULL) { 112 fprintf(stderr, "%s: %s: %s\n", getprogname(), 113 peer_addr, msgbuf_strvised); 114 syslog(priority, "%s: %s", 115 peer_addr, msgbuf_strvised); 116 } else { 117 fprintf(stderr, "%s: %s\n", getprogname(), msgbuf_strvised); 118 syslog(priority, "%s", msgbuf_strvised); 119 } 120 121 } else { 122 errstr = strerror(log_errno); 123 124 if (peer_name != NULL) { 125 fprintf(stderr, "%s: %s (%s): %s: %s\n", getprogname(), 126 peer_addr, peer_name, msgbuf_strvised, errstr); 127 syslog(priority, "%s (%s): %s: %s", 128 peer_addr, peer_name, msgbuf_strvised, errstr); 129 } else if (peer_addr != NULL) { 130 fprintf(stderr, "%s: %s: %s: %s\n", getprogname(), 131 peer_addr, msgbuf_strvised, errstr); 132 syslog(priority, "%s: %s: %s", 133 peer_addr, msgbuf_strvised, errstr); 134 } else { 135 fprintf(stderr, "%s: %s: %s\n", getprogname(), 136 msgbuf_strvised, errstr); 137 syslog(priority, "%s: %s", 138 msgbuf_strvised, errstr); 139 } 140 } 141 } 142 143 void 144 log_err(int eval, const char *fmt, ...) 145 { 146 va_list ap; 147 148 va_start(ap, fmt); 149 log_common(LOG_CRIT, errno, fmt, ap); 150 va_end(ap); 151 152 exit(eval); 153 } 154 155 void 156 log_errx(int eval, const char *fmt, ...) 157 { 158 va_list ap; 159 160 va_start(ap, fmt); 161 log_common(LOG_CRIT, -1, fmt, ap); 162 va_end(ap); 163 164 exit(eval); 165 } 166 167 void 168 log_warn(const char *fmt, ...) 169 { 170 va_list ap; 171 172 va_start(ap, fmt); 173 log_common(LOG_WARNING, errno, fmt, ap); 174 va_end(ap); 175 } 176 177 void 178 log_warnx(const char *fmt, ...) 179 { 180 va_list ap; 181 182 va_start(ap, fmt); 183 log_common(LOG_WARNING, -1, fmt, ap); 184 va_end(ap); 185 } 186 187 void 188 log_debugx(const char *fmt, ...) 189 { 190 va_list ap; 191 192 if (log_level == 0) 193 return; 194 195 va_start(ap, fmt); 196 log_common(LOG_DEBUG, -1, fmt, ap); 197 va_end(ap); 198 } 199