1 /* 2 * Copyright (c) 1983, 1988 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)syslog.c 5.35 (Berkeley) 06/24/92"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/types.h> 13 #include <sys/socket.h> 14 #include <sys/file.h> 15 #include <sys/syslog.h> 16 #include <sys/uio.h> 17 #include <sys/errno.h> 18 #include <netdb.h> 19 #include <string.h> 20 #if __STDC__ 21 #include <stdarg.h> 22 #else 23 #include <varargs.h> 24 #endif 25 #include <time.h> 26 #include <unistd.h> 27 #include <paths.h> 28 #include <stdio.h> 29 30 static int LogFile = -1; /* fd for log */ 31 static int connected; /* have done connect */ 32 static int LogStat = 0; /* status bits, set by openlog() */ 33 static const char *LogTag = "syslog"; /* string to tag the entry with */ 34 static int LogFacility = LOG_USER; /* default facility code */ 35 static int LogMask = 0xff; /* mask of priorities to be logged */ 36 37 /* 38 * syslog, vsyslog -- 39 * print message on log file; output is intended for syslogd(8). 40 */ 41 void 42 #if __STDC__ 43 syslog(int pri, const char *fmt, ...) 44 #else 45 syslog(pri, fmt, va_alist) 46 int pri; 47 char *fmt; 48 va_dcl 49 #endif 50 { 51 va_list ap; 52 53 #if __STDC__ 54 va_start(ap, fmt); 55 #else 56 va_start(ap); 57 #endif 58 vsyslog(pri, fmt, ap); 59 va_end(ap); 60 } 61 62 void 63 vsyslog(pri, fmt, ap) 64 int pri; 65 register const char *fmt; 66 va_list ap; 67 { 68 register int cnt; 69 register char *p; 70 time_t now; 71 int fd, saved_errno; 72 char *stdp, tbuf[2048], fmt_cpy[1024]; 73 74 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID 75 /* Check for invalid bits. */ 76 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) { 77 syslog(INTERNALLOG, 78 "syslog: unknown facility/priority: %x", pri); 79 pri &= LOG_PRIMASK|LOG_FACMASK; 80 } 81 82 /* Check priority against setlogmask values. */ 83 if (!LOG_MASK(LOG_PRI(pri)) & LogMask) 84 return; 85 86 saved_errno = errno; 87 88 /* set default facility if none specified */ 89 if ((pri & LOG_FACMASK) == 0) 90 pri |= LogFacility; 91 92 /* build the message */ 93 (void)time(&now); 94 (void)sprintf(tbuf, "<%d>%.15s ", pri, ctime(&now) + 4); 95 for (p = tbuf; *p; ++p); 96 if (LogStat & LOG_PERROR) 97 stdp = p; 98 if (LogTag) { 99 (void)strcpy(p, LogTag); 100 for (; *p; ++p); 101 } 102 if (LogStat & LOG_PID) { 103 (void)sprintf(p, "[%d]", getpid()); 104 for (; *p; ++p); 105 } 106 if (LogTag) { 107 *p++ = ':'; 108 *p++ = ' '; 109 } 110 111 /* substitute error message for %m */ 112 { 113 register char ch, *t1, *t2; 114 char *strerror(); 115 116 for (t1 = fmt_cpy; ch = *fmt; ++fmt) 117 if (ch == '%' && fmt[1] == 'm') { 118 ++fmt; 119 for (t2 = strerror(saved_errno); 120 *t1 = *t2++; ++t1); 121 } 122 else 123 *t1++ = ch; 124 *t1 = '\0'; 125 } 126 127 (void)vsprintf(p, fmt_cpy, ap); 128 129 cnt = strlen(tbuf); 130 131 /* output to stderr if requested */ 132 if (LogStat & LOG_PERROR) { 133 struct iovec iov[2]; 134 register struct iovec *v = iov; 135 136 v->iov_base = stdp; 137 v->iov_len = cnt - (stdp - tbuf); 138 ++v; 139 v->iov_base = "\n"; 140 v->iov_len = 1; 141 (void)writev(STDERR_FILENO, iov, 2); 142 } 143 144 /* get connected, output the message to the local logger */ 145 if (!connected) 146 openlog(LogTag, LogStat | LOG_NDELAY, 0); 147 if (send(LogFile, tbuf, cnt, 0) >= 0) 148 return; 149 150 /* see if should attempt the console */ 151 if (!(LogStat&LOG_CONS)) 152 return; 153 154 /* 155 * Output the message to the console; don't worry about blocking, 156 * if console blocks everything will. Make sure the error reported 157 * is the one from the syslogd failure. 158 */ 159 if ((fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) { 160 (void)strcat(tbuf, "\r\n"); 161 cnt += 2; 162 p = index(tbuf, '>') + 1; 163 (void)write(fd, p, cnt - (p - tbuf)); 164 (void)close(fd); 165 } 166 } 167 168 static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */ 169 170 void 171 openlog(ident, logstat, logfac) 172 const char *ident; 173 int logstat, logfac; 174 { 175 if (ident != NULL) 176 LogTag = ident; 177 LogStat = logstat; 178 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0) 179 LogFacility = logfac; 180 181 if (LogFile == -1) { 182 SyslogAddr.sa_family = AF_UNIX; 183 (void)strncpy(SyslogAddr.sa_data, _PATH_LOG, 184 sizeof(SyslogAddr.sa_data)); 185 if (LogStat & LOG_NDELAY) { 186 if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) 187 return; 188 (void)fcntl(LogFile, F_SETFD, 1); 189 } 190 } 191 if (LogFile != -1 && !connected) 192 if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) { 193 (void)close(LogFile); 194 LogFile = -1; 195 } else 196 connected = 1; 197 } 198 199 void 200 closelog() 201 { 202 (void)close(LogFile); 203 LogFile = -1; 204 connected = 0; 205 } 206 207 /* setlogmask -- set the log mask level */ 208 int 209 setlogmask(pmask) 210 int pmask; 211 { 212 int omask; 213 214 omask = LogMask; 215 if (pmask != 0) 216 LogMask = pmask; 217 return (omask); 218 } 219