1 /* 2 * Copyright (c) 1983, 1988 Regents of the University of California. 3 * 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 5.36 (Berkeley) 10/4/92"; 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 = "syslog"; /* 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 65 /* 66 * syslog, vsyslog -- 67 * print message on log file; output is intended for syslogd(8). 68 */ 69 void 70 #if __STDC__ 71 syslog(int pri, const char *fmt, ...) 72 #else 73 syslog(pri, fmt, va_alist) 74 int pri; 75 char *fmt; 76 va_dcl 77 #endif 78 { 79 va_list ap; 80 81 #if __STDC__ 82 va_start(ap, fmt); 83 #else 84 va_start(ap); 85 #endif 86 vsyslog(pri, fmt, ap); 87 va_end(ap); 88 } 89 90 void 91 vsyslog(pri, fmt, ap) 92 int pri; 93 register const char *fmt; 94 va_list ap; 95 { 96 register int cnt; 97 register char *p; 98 time_t now; 99 int fd, saved_errno; 100 char *stdp, tbuf[2048], fmt_cpy[1024]; 101 102 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID 103 /* Check for invalid bits. */ 104 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) { 105 syslog(INTERNALLOG, 106 "syslog: unknown facility/priority: %x", pri); 107 pri &= LOG_PRIMASK|LOG_FACMASK; 108 } 109 110 /* Check priority against setlogmask values. */ 111 if (!LOG_MASK(LOG_PRI(pri)) & LogMask) 112 return; 113 114 saved_errno = errno; 115 116 /* set default facility if none specified */ 117 if ((pri & LOG_FACMASK) == 0) 118 pri |= LogFacility; 119 120 /* build the message */ 121 (void)time(&now); 122 (void)sprintf(tbuf, "<%d>%.15s ", pri, ctime(&now) + 4); 123 for (p = tbuf; *p; ++p); 124 if (LogStat & LOG_PERROR) 125 stdp = p; 126 if (LogTag) { 127 (void)strcpy(p, LogTag); 128 for (; *p; ++p); 129 } 130 if (LogStat & LOG_PID) { 131 (void)sprintf(p, "[%d]", getpid()); 132 for (; *p; ++p); 133 } 134 if (LogTag) { 135 *p++ = ':'; 136 *p++ = ' '; 137 } 138 139 /* substitute error message for %m */ 140 { 141 register char ch, *t1, *t2; 142 char *strerror(); 143 144 for (t1 = fmt_cpy; ch = *fmt; ++fmt) 145 if (ch == '%' && fmt[1] == 'm') { 146 ++fmt; 147 for (t2 = strerror(saved_errno); 148 *t1 = *t2++; ++t1); 149 } 150 else 151 *t1++ = ch; 152 *t1 = '\0'; 153 } 154 155 (void)vsprintf(p, fmt_cpy, ap); 156 157 cnt = strlen(tbuf); 158 159 /* output to stderr if requested */ 160 if (LogStat & LOG_PERROR) { 161 struct iovec iov[2]; 162 register struct iovec *v = iov; 163 164 v->iov_base = stdp; 165 v->iov_len = cnt - (stdp - tbuf); 166 ++v; 167 v->iov_base = "\n"; 168 v->iov_len = 1; 169 (void)writev(STDERR_FILENO, iov, 2); 170 } 171 172 /* get connected, output the message to the local logger */ 173 if (!connected) 174 openlog(LogTag, LogStat | LOG_NDELAY, 0); 175 if (send(LogFile, tbuf, cnt, 0) >= 0) 176 return; 177 178 /* see if should attempt the console */ 179 if (!(LogStat&LOG_CONS)) 180 return; 181 182 /* 183 * Output the message to the console; don't worry about blocking, 184 * if console blocks everything will. Make sure the error reported 185 * is the one from the syslogd failure. 186 */ 187 if ((fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) { 188 (void)strcat(tbuf, "\r\n"); 189 cnt += 2; 190 p = index(tbuf, '>') + 1; 191 (void)write(fd, p, cnt - (p - tbuf)); 192 (void)close(fd); 193 } 194 } 195 196 static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */ 197 198 void 199 openlog(ident, logstat, logfac) 200 const char *ident; 201 int logstat, logfac; 202 { 203 if (ident != NULL) 204 LogTag = ident; 205 LogStat = logstat; 206 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0) 207 LogFacility = logfac; 208 209 if (LogFile == -1) { 210 SyslogAddr.sa_family = AF_UNIX; 211 (void)strncpy(SyslogAddr.sa_data, _PATH_LOG, 212 sizeof(SyslogAddr.sa_data)); 213 if (LogStat & LOG_NDELAY) { 214 if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) 215 return; 216 (void)fcntl(LogFile, F_SETFD, 1); 217 } 218 } 219 if (LogFile != -1 && !connected) 220 if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) { 221 (void)close(LogFile); 222 LogFile = -1; 223 } else 224 connected = 1; 225 } 226 227 void 228 closelog() 229 { 230 (void)close(LogFile); 231 LogFile = -1; 232 connected = 0; 233 } 234 235 /* setlogmask -- set the log mask level */ 236 int 237 setlogmask(pmask) 238 int pmask; 239 { 240 int omask; 241 242 omask = LogMask; 243 if (pmask != 0) 244 LogMask = pmask; 245 return (omask); 246 } 247