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 * Format of the magic cookie passed through the stdio hook 68 */ 69 struct bufcookie { 70 char *base; /* start of buffer */ 71 int left; 72 }; 73 74 /* 75 * stdio write hook for writing to a static string buffer 76 * XXX: Maybe one day, dynamically allocate it so that the line length 77 * is `unlimited'. 78 */ 79 static writehook(cookie, buf, len) 80 void *cookie; /* really [struct bufcookie *] */ 81 char *buf; /* characters to copy */ 82 int len; /* length to copy */ 83 { 84 struct bufcookie *h; /* private `handle' */ 85 86 h = (struct bufcookie *)cookie; 87 if (len > h->left) { 88 /* clip in case of wraparound */ 89 len = h->left; 90 } 91 if (len > 0) { 92 (void)memcpy(h->base, buf, len); /* `write' it. */ 93 h->base += len; 94 h->left -= len; 95 } 96 return 0; 97 } 98 99 /* 100 * syslog, vsyslog -- 101 * print message on log file; output is intended for syslogd(8). 102 */ 103 void 104 #if __STDC__ 105 syslog(int pri, const char *fmt, ...) 106 #else 107 syslog(pri, fmt, va_alist) 108 int pri; 109 char *fmt; 110 va_dcl 111 #endif 112 { 113 va_list ap; 114 115 #if __STDC__ 116 va_start(ap, fmt); 117 #else 118 va_start(ap); 119 #endif 120 vsyslog(pri, fmt, ap); 121 va_end(ap); 122 } 123 124 void 125 vsyslog(pri, fmt, ap) 126 int pri; 127 register const char *fmt; 128 va_list ap; 129 { 130 register int cnt; 131 register char ch, *p, *t; 132 time_t now; 133 int fd, saved_errno; 134 char *stdp, tbuf[2048], fmt_cpy[1024]; 135 FILE *fp, *fmt_fp; 136 struct bufcookie tbuf_cookie; 137 struct bufcookie fmt_cookie; 138 139 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID 140 /* Check for invalid bits. */ 141 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) { 142 syslog(INTERNALLOG, 143 "syslog: unknown facility/priority: %x", pri); 144 pri &= LOG_PRIMASK|LOG_FACMASK; 145 } 146 147 /* Check priority against setlogmask values. */ 148 if (!(LOG_MASK(LOG_PRI(pri)) & LogMask)) 149 return; 150 151 saved_errno = errno; 152 153 /* Set default facility if none specified. */ 154 if ((pri & LOG_FACMASK) == 0) 155 pri |= LogFacility; 156 157 /* Create the primary stdio hook */ 158 tbuf_cookie.base = tbuf; 159 tbuf_cookie.left = sizeof(tbuf); 160 fp = fwopen(&tbuf_cookie, writehook); 161 if (fp == NULL) 162 return; 163 164 /* Build the message. */ 165 (void)time(&now); 166 (void)fprintf(fp, "<%d>", pri); 167 (void)fprintf(fp, "%.15s ", ctime(&now) + 4); 168 if (LogStat & LOG_PERROR) { 169 /* Transfer to string buffer */ 170 (void)fflush(fp); 171 stdp = tbuf + (sizeof(tbuf) - tbuf_cookie.left); 172 } 173 if (LogTag == NULL) 174 LogTag = __progname; 175 if (LogTag != NULL) 176 (void)fprintf(fp, "%s", LogTag); 177 if (LogStat & LOG_PID) 178 (void)fprintf(fp, "[%d]", getpid()); 179 if (LogTag != NULL) { 180 (void)fprintf(fp, ": "); 181 } 182 183 /* Check to see if we can skip expanding the %m */ 184 if (strstr(fmt, "%m")) { 185 186 /* Create the second stdio hook */ 187 fmt_cookie.base = fmt_cpy; 188 fmt_cookie.left = sizeof(fmt_cpy) - 1; 189 fmt_fp = fwopen(&fmt_cookie, writehook); 190 if (fmt_fp == NULL) { 191 fclose(fp); 192 return; 193 } 194 195 /* Substitute error message for %m. */ 196 for ( ; ch = *fmt; ++fmt) 197 if (ch == '%' && fmt[1] == 'm') { 198 ++fmt; 199 fputs(strerror(saved_errno), fmt_fp); 200 } else 201 fputc(ch, fmt_fp); 202 203 /* Null terminate if room */ 204 fputc(0, fmt_fp); 205 fclose(fmt_fp); 206 207 /* Guarantee null termination */ 208 fmt_cpy[sizeof(fmt_cpy) - 1] = '\0'; 209 210 fmt = fmt_cpy; 211 } 212 213 (void)vfprintf(fp, fmt, ap); 214 (void)fclose(fp); 215 216 cnt = sizeof(tbuf) - tbuf_cookie.left; 217 218 /* Output to stderr if requested. */ 219 if (LogStat & LOG_PERROR) { 220 struct iovec iov[2]; 221 register struct iovec *v = iov; 222 223 v->iov_base = stdp; 224 v->iov_len = cnt - (stdp - tbuf); 225 ++v; 226 v->iov_base = "\n"; 227 v->iov_len = 1; 228 (void)writev(STDERR_FILENO, iov, 2); 229 } 230 231 /* Get connected, output the message to the local logger. */ 232 if (!connected) 233 openlog(LogTag, LogStat | LOG_NDELAY, 0); 234 if (send(LogFile, tbuf, cnt, 0) >= 0) 235 return; 236 237 /* 238 * Output the message to the console; don't worry about blocking, 239 * if console blocks everything will. Make sure the error reported 240 * is the one from the syslogd failure. 241 */ 242 if (LogStat & LOG_CONS && 243 (fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) { 244 struct iovec iov[2]; 245 register struct iovec *v = iov; 246 247 p = strchr(tbuf, '>') + 1; 248 v->iov_base = p; 249 v->iov_len = cnt - (p - tbuf); 250 ++v; 251 v->iov_base = "\r\n"; 252 v->iov_len = 2; 253 (void)writev(fd, iov, 2); 254 (void)close(fd); 255 } 256 } 257 258 static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */ 259 260 void 261 openlog(ident, logstat, logfac) 262 const char *ident; 263 int logstat, logfac; 264 { 265 if (ident != NULL) 266 LogTag = ident; 267 LogStat = logstat; 268 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0) 269 LogFacility = logfac; 270 271 if (LogFile == -1) { 272 SyslogAddr.sa_family = AF_UNIX; 273 (void)strncpy(SyslogAddr.sa_data, _PATH_LOG, 274 sizeof(SyslogAddr.sa_data)); 275 if (LogStat & LOG_NDELAY) { 276 if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) 277 return; 278 (void)fcntl(LogFile, F_SETFD, 1); 279 } 280 } 281 if (LogFile != -1 && !connected) 282 if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) { 283 (void)close(LogFile); 284 LogFile = -1; 285 } else 286 connected = 1; 287 } 288 289 void 290 closelog() 291 { 292 (void)close(LogFile); 293 LogFile = -1; 294 connected = 0; 295 } 296 297 /* setlogmask -- set the log mask level */ 298 int 299 setlogmask(pmask) 300 int pmask; 301 { 302 int omask; 303 304 omask = LogMask; 305 if (pmask != 0) 306 LogMask = pmask; 307 return (omask); 308 } 309