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