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 = "from: @(#)syslog.c 5.36 (Berkeley) 10/4/92";*/ 36 static char *rcsid = "$Id: syslog.c,v 1.5 1993/11/24 19:43:57 jtc Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <sys/types.h> 40 #include <sys/socket.h> 41 #include <sys/syslog.h> 42 #include <sys/uio.h> 43 #include <netdb.h> 44 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <paths.h> 48 #include <stdio.h> 49 #include <string.h> 50 #include <time.h> 51 #include <unistd.h> 52 53 #if __STDC__ 54 #include <stdarg.h> 55 #else 56 #include <varargs.h> 57 #endif 58 59 static int LogFile = -1; /* fd for log */ 60 static int connected; /* have done connect */ 61 static int LogStat = 0; /* status bits, set by openlog() */ 62 static const char *LogTag = "syslog"; /* string to tag the entry with */ 63 static int LogFacility = LOG_USER; /* default facility code */ 64 static int LogMask = 0xff; /* mask of priorities to be logged */ 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 *p; 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 (void)sprintf(tbuf, "<%d>%.15s ", pri, ctime(&now) + 4); 124 for (p = tbuf; *p; ++p); 125 if (LogStat & LOG_PERROR) 126 stdp = p; 127 if (LogTag) { 128 (void)strcpy(p, LogTag); 129 for (; *p; ++p); 130 } 131 if (LogStat & LOG_PID) { 132 (void)sprintf(p, "[%d]", getpid()); 133 for (; *p; ++p); 134 } 135 if (LogTag) { 136 *p++ = ':'; 137 *p++ = ' '; 138 } 139 140 /* substitute error message for %m */ 141 { 142 register char ch, *t1, *t2; 143 char *strerror(); 144 145 for (t1 = fmt_cpy; ch = *fmt; ++fmt) 146 if (ch == '%' && fmt[1] == 'm') { 147 ++fmt; 148 for (t2 = strerror(saved_errno); 149 *t1 = *t2++; ++t1); 150 } 151 else 152 *t1++ = ch; 153 *t1 = '\0'; 154 } 155 156 (void)vsprintf(p, fmt_cpy, ap); 157 158 cnt = strlen(tbuf); 159 160 /* output to stderr if requested */ 161 if (LogStat & LOG_PERROR) { 162 struct iovec iov[2]; 163 register struct iovec *v = iov; 164 165 v->iov_base = stdp; 166 v->iov_len = cnt - (stdp - tbuf); 167 ++v; 168 v->iov_base = "\n"; 169 v->iov_len = 1; 170 (void)writev(STDERR_FILENO, iov, 2); 171 } 172 173 /* get connected, output the message to the local logger */ 174 if (!connected) 175 openlog(LogTag, LogStat | LOG_NDELAY, 0); 176 if (send(LogFile, tbuf, cnt, 0) >= 0) 177 return; 178 179 /* see if should attempt the console */ 180 if (!(LogStat&LOG_CONS)) 181 return; 182 183 /* 184 * Output the message to the console; don't worry about blocking, 185 * if console blocks everything will. Make sure the error reported 186 * is the one from the syslogd failure. 187 */ 188 if ((fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) { 189 (void)strcat(tbuf, "\r\n"); 190 cnt += 2; 191 p = strchr(tbuf, '>') + 1; 192 (void)write(fd, p, cnt - (p - tbuf)); 193 (void)close(fd); 194 } 195 } 196 197 static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */ 198 199 void 200 openlog(ident, logstat, logfac) 201 const char *ident; 202 int logstat, logfac; 203 { 204 if (ident != NULL) 205 LogTag = ident; 206 LogStat = logstat; 207 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0) 208 LogFacility = logfac; 209 210 if (LogFile == -1) { 211 SyslogAddr.sa_family = AF_UNIX; 212 (void)strncpy(SyslogAddr.sa_data, _PATH_LOG, 213 sizeof(SyslogAddr.sa_data)); 214 if (LogStat & LOG_NDELAY) { 215 if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) 216 return; 217 (void)fcntl(LogFile, F_SETFD, 1); 218 } 219 } 220 if (LogFile != -1 && !connected) 221 if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) { 222 (void)close(LogFile); 223 LogFile = -1; 224 } else 225 connected = 1; 226 } 227 228 void 229 closelog() 230 { 231 (void)close(LogFile); 232 LogFile = -1; 233 connected = 0; 234 } 235 236 /* setlogmask -- set the log mask level */ 237 int 238 setlogmask(pmask) 239 int pmask; 240 { 241 int omask; 242 243 omask = LogMask; 244 if (pmask != 0) 245 LogMask = pmask; 246 return (omask); 247 } 248