1 /* 2 * Copyright (c) 1983, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)syslog.c 8.1 (Berkeley) 06/04/93"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/types.h> 13 #include <sys/socket.h> 14 #include <sys/syslog.h> 15 #include <sys/uio.h> 16 #include <netdb.h> 17 18 #include <errno.h> 19 #include <fcntl.h> 20 #include <paths.h> 21 #include <stdio.h> 22 #include <string.h> 23 #include <time.h> 24 #include <unistd.h> 25 26 #if __STDC__ 27 #include <stdarg.h> 28 #else 29 #include <varargs.h> 30 #endif 31 32 static int LogFile = -1; /* fd for log */ 33 static int connected; /* have done connect */ 34 static int LogStat = 0; /* status bits, set by openlog() */ 35 static const char *LogTag = "syslog"; /* string to tag the entry with */ 36 static int LogFacility = LOG_USER; /* default facility code */ 37 static int LogMask = 0xff; /* mask of priorities to be logged */ 38 39 /* 40 * syslog, vsyslog -- 41 * print message on log file; output is intended for syslogd(8). 42 */ 43 void 44 #if __STDC__ 45 syslog(int pri, const char *fmt, ...) 46 #else 47 syslog(pri, fmt, va_alist) 48 int pri; 49 char *fmt; 50 va_dcl 51 #endif 52 { 53 va_list ap; 54 55 #if __STDC__ 56 va_start(ap, fmt); 57 #else 58 va_start(ap); 59 #endif 60 vsyslog(pri, fmt, ap); 61 va_end(ap); 62 } 63 64 void 65 vsyslog(pri, fmt, ap) 66 int pri; 67 register const char *fmt; 68 va_list ap; 69 { 70 register int cnt; 71 register char *p; 72 time_t now; 73 int fd, saved_errno; 74 char *stdp, tbuf[2048], fmt_cpy[1024]; 75 76 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID 77 /* Check for invalid bits. */ 78 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) { 79 syslog(INTERNALLOG, 80 "syslog: unknown facility/priority: %x", pri); 81 pri &= LOG_PRIMASK|LOG_FACMASK; 82 } 83 84 /* Check priority against setlogmask values. */ 85 if (!LOG_MASK(LOG_PRI(pri)) & LogMask) 86 return; 87 88 saved_errno = errno; 89 90 /* set default facility if none specified */ 91 if ((pri & LOG_FACMASK) == 0) 92 pri |= LogFacility; 93 94 /* build the message */ 95 (void)time(&now); 96 (void)sprintf(tbuf, "<%d>%.15s ", pri, ctime(&now) + 4); 97 for (p = tbuf; *p; ++p); 98 if (LogStat & LOG_PERROR) 99 stdp = p; 100 if (LogTag) { 101 (void)strcpy(p, LogTag); 102 for (; *p; ++p); 103 } 104 if (LogStat & LOG_PID) { 105 (void)sprintf(p, "[%d]", getpid()); 106 for (; *p; ++p); 107 } 108 if (LogTag) { 109 *p++ = ':'; 110 *p++ = ' '; 111 } 112 113 /* substitute error message for %m */ 114 { 115 register char ch, *t1, *t2; 116 char *strerror(); 117 118 for (t1 = fmt_cpy; ch = *fmt; ++fmt) 119 if (ch == '%' && fmt[1] == 'm') { 120 ++fmt; 121 for (t2 = strerror(saved_errno); 122 *t1 = *t2++; ++t1); 123 } 124 else 125 *t1++ = ch; 126 *t1 = '\0'; 127 } 128 129 (void)vsprintf(p, fmt_cpy, ap); 130 131 cnt = strlen(tbuf); 132 133 /* output to stderr if requested */ 134 if (LogStat & LOG_PERROR) { 135 struct iovec iov[2]; 136 register struct iovec *v = iov; 137 138 v->iov_base = stdp; 139 v->iov_len = cnt - (stdp - tbuf); 140 ++v; 141 v->iov_base = "\n"; 142 v->iov_len = 1; 143 (void)writev(STDERR_FILENO, iov, 2); 144 } 145 146 /* get connected, output the message to the local logger */ 147 if (!connected) 148 openlog(LogTag, LogStat | LOG_NDELAY, 0); 149 if (send(LogFile, tbuf, cnt, 0) >= 0) 150 return; 151 152 /* see if should attempt the console */ 153 if (!(LogStat&LOG_CONS)) 154 return; 155 156 /* 157 * Output the message to the console; don't worry about blocking, 158 * if console blocks everything will. Make sure the error reported 159 * is the one from the syslogd failure. 160 */ 161 if ((fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) { 162 (void)strcat(tbuf, "\r\n"); 163 cnt += 2; 164 p = index(tbuf, '>') + 1; 165 (void)write(fd, p, cnt - (p - tbuf)); 166 (void)close(fd); 167 } 168 } 169 170 static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */ 171 172 void 173 openlog(ident, logstat, logfac) 174 const char *ident; 175 int logstat, logfac; 176 { 177 if (ident != NULL) 178 LogTag = ident; 179 LogStat = logstat; 180 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0) 181 LogFacility = logfac; 182 183 if (LogFile == -1) { 184 SyslogAddr.sa_family = AF_UNIX; 185 (void)strncpy(SyslogAddr.sa_data, _PATH_LOG, 186 sizeof(SyslogAddr.sa_data)); 187 if (LogStat & LOG_NDELAY) { 188 if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) 189 return; 190 (void)fcntl(LogFile, F_SETFD, 1); 191 } 192 } 193 if (LogFile != -1 && !connected) 194 if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) { 195 (void)close(LogFile); 196 LogFile = -1; 197 } else 198 connected = 1; 199 } 200 201 void 202 closelog() 203 { 204 (void)close(LogFile); 205 LogFile = -1; 206 connected = 0; 207 } 208 209 /* setlogmask -- set the log mask level */ 210 int 211 setlogmask(pmask) 212 int pmask; 213 { 214 int omask; 215 216 omask = LogMask; 217 if (pmask != 0) 218 LogMask = pmask; 219 return (omask); 220 } 221