1 /* $NetBSD: syslog.c,v 1.7 1995/03/04 01:56:12 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)syslog.c 8.4 (Berkeley) 3/18/94"; 39 #else 40 static char rcsid[] = "$NetBSD: syslog.c,v 1.7 1995/03/04 01:56:12 cgd Exp $"; 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include <sys/types.h> 45 #include <sys/socket.h> 46 #include <sys/syslog.h> 47 #include <sys/uio.h> 48 #include <netdb.h> 49 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <paths.h> 53 #include <stdio.h> 54 #include <string.h> 55 #include <time.h> 56 #include <unistd.h> 57 58 #if __STDC__ 59 #include <stdarg.h> 60 #else 61 #include <varargs.h> 62 #endif 63 64 static int LogFile = -1; /* fd for log */ 65 static int connected; /* have done connect */ 66 static int LogStat = 0; /* status bits, set by openlog() */ 67 static const char *LogTag = NULL; /* string to tag the entry with */ 68 static int LogFacility = LOG_USER; /* default facility code */ 69 static int LogMask = 0xff; /* mask of priorities to be logged */ 70 extern char *__progname; /* Program name, from crt0. */ 71 72 /* 73 * syslog, vsyslog -- 74 * print message on log file; output is intended for syslogd(8). 75 */ 76 void 77 #if __STDC__ 78 syslog(int pri, const char *fmt, ...) 79 #else 80 syslog(pri, fmt, va_alist) 81 int pri; 82 char *fmt; 83 va_dcl 84 #endif 85 { 86 va_list ap; 87 88 #if __STDC__ 89 va_start(ap, fmt); 90 #else 91 va_start(ap); 92 #endif 93 vsyslog(pri, fmt, ap); 94 va_end(ap); 95 } 96 97 void 98 vsyslog(pri, fmt, ap) 99 int pri; 100 register const char *fmt; 101 va_list ap; 102 { 103 register int cnt; 104 register char ch, *p, *t; 105 time_t now; 106 int fd, saved_errno; 107 char *stdp, tbuf[2048], fmt_cpy[1024]; 108 109 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID 110 /* Check for invalid bits. */ 111 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) { 112 syslog(INTERNALLOG, 113 "syslog: unknown facility/priority: %x", pri); 114 pri &= LOG_PRIMASK|LOG_FACMASK; 115 } 116 117 /* Check priority against setlogmask values. */ 118 if (!LOG_MASK(LOG_PRI(pri)) & LogMask) 119 return; 120 121 saved_errno = errno; 122 123 /* Set default facility if none specified. */ 124 if ((pri & LOG_FACMASK) == 0) 125 pri |= LogFacility; 126 127 /* Build the message. */ 128 (void)time(&now); 129 p = tbuf + sprintf(tbuf, "<%d>", pri); 130 p += strftime(p, sizeof (tbuf) - (p - tbuf), "%h %e %T ", 131 localtime(&now)); 132 if (LogStat & LOG_PERROR) 133 stdp = p; 134 if (LogTag == NULL) 135 LogTag = __progname; 136 if (LogTag != NULL) 137 p += sprintf(p, "%s", LogTag); 138 if (LogStat & LOG_PID) 139 p += sprintf(p, "[%d]", getpid()); 140 if (LogTag != NULL) { 141 *p++ = ':'; 142 *p++ = ' '; 143 } 144 145 /* Substitute error message for %m. */ 146 for (t = fmt_cpy; ch = *fmt; ++fmt) 147 if (ch == '%' && fmt[1] == 'm') { 148 ++fmt; 149 t += sprintf(t, "%s", strerror(saved_errno)); 150 } else 151 *t++ = ch; 152 *t = '\0'; 153 154 p += vsprintf(p, fmt_cpy, ap); 155 cnt = p - tbuf; 156 157 /* Output to stderr if requested. */ 158 if (LogStat & LOG_PERROR) { 159 struct iovec iov[2]; 160 register struct iovec *v = iov; 161 162 v->iov_base = stdp; 163 v->iov_len = cnt - (stdp - tbuf); 164 ++v; 165 v->iov_base = "\n"; 166 v->iov_len = 1; 167 (void)writev(STDERR_FILENO, iov, 2); 168 } 169 170 /* Get connected, output the message to the local logger. */ 171 if (!connected) 172 openlog(LogTag, LogStat | LOG_NDELAY, 0); 173 if (send(LogFile, tbuf, cnt, 0) >= 0) 174 return; 175 176 /* 177 * Output the message to the console; don't worry about blocking, 178 * if console blocks everything will. Make sure the error reported 179 * is the one from the syslogd failure. 180 */ 181 if (LogStat & LOG_CONS && 182 (fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) { 183 (void)strcat(tbuf, "\r\n"); 184 cnt += 2; 185 p = strchr(tbuf, '>') + 1; 186 (void)write(fd, p, cnt - (p - tbuf)); 187 (void)close(fd); 188 } 189 } 190 191 static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */ 192 193 void 194 openlog(ident, logstat, logfac) 195 const char *ident; 196 int logstat, logfac; 197 { 198 if (ident != NULL) 199 LogTag = ident; 200 LogStat = logstat; 201 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0) 202 LogFacility = logfac; 203 204 if (LogFile == -1) { 205 SyslogAddr.sa_family = AF_UNIX; 206 (void)strncpy(SyslogAddr.sa_data, _PATH_LOG, 207 sizeof(SyslogAddr.sa_data)); 208 if (LogStat & LOG_NDELAY) { 209 if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) 210 return; 211 (void)fcntl(LogFile, F_SETFD, 1); 212 } 213 } 214 if (LogFile != -1 && !connected) 215 if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) { 216 (void)close(LogFile); 217 LogFile = -1; 218 } else 219 connected = 1; 220 } 221 222 void 223 closelog() 224 { 225 (void)close(LogFile); 226 LogFile = -1; 227 connected = 0; 228 } 229 230 /* setlogmask -- set the log mask level */ 231 int 232 setlogmask(pmask) 233 int pmask; 234 { 235 int omask; 236 237 omask = LogMask; 238 if (pmask != 0) 239 LogMask = pmask; 240 return (omask); 241 } 242