| 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 are permitted |
| 6 | * provided that the above copyright notice and this paragraph are |
| 7 | * duplicated in all such forms and that any documentation, |
| 8 | * advertising materials, and other materials related to such |
| 9 | * distribution and use acknowledge that the software was developed |
| 10 | * by the University of California, Berkeley. The name of the |
| 11 | * University may not be used to endorse or promote products derived |
| 12 | * from this software without specific prior written permission. |
| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| 15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 16 | */ |
| 17 | |
| 18 | #if defined(LIBC_SCCS) && !defined(lint) |
| 19 | static char sccsid[] = "@(#)syslog.c 5.16 (Berkeley) %G%"; |
| 20 | #endif /* LIBC_SCCS and not lint */ |
| 21 | |
| 22 | /* |
| 23 | * SYSLOG -- print message on log file |
| 24 | * |
| 25 | * This routine looks a lot like printf, except that it |
| 26 | * outputs to the log file instead of the standard output. |
| 27 | * Also: |
| 28 | * adds a timestamp, |
| 29 | * prints the module name in front of the message, |
| 30 | * has some other formatting types (or will sometime), |
| 31 | * adds a newline on the end of the message. |
| 32 | * |
| 33 | * The output of this routine is intended to be read by /etc/syslogd. |
| 34 | * |
| 35 | * Author: Eric Allman |
| 36 | * Modified to use UNIX domain IPC by Ralph Campbell |
| 37 | */ |
| 38 | |
| 39 | #include <sys/types.h> |
| 40 | #include <sys/socket.h> |
| 41 | #include <sys/file.h> |
| 42 | #include <sys/signal.h> |
| 43 | #include <sys/syslog.h> |
| 44 | #include <netdb.h> |
| 45 | #include <strings.h> |
| 46 | |
| 47 | #define MAXLINE 1024 /* max message size */ |
| 48 | #define NULL 0 /* manifest */ |
| 49 | |
| 50 | #define IMPORTANT LOG_ERR |
| 51 | |
| 52 | static char logname[] = "/dev/log"; |
| 53 | static char ctty[] = "/dev/console"; |
| 54 | |
| 55 | static int LogFile = -1; /* fd for log */ |
| 56 | static int connected; /* have done connect */ |
| 57 | static int LogStat = 0; /* status bits, set by openlog() */ |
| 58 | static char *LogTag = "syslog"; /* string to tag the entry with */ |
| 59 | static int LogMask = 0xff; /* mask of priorities to be logged */ |
| 60 | static int LogFacility = LOG_USER; /* default facility code */ |
| 61 | |
| 62 | static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */ |
| 63 | |
| 64 | extern int errno, sys_nerr; |
| 65 | extern char *sys_errlist[]; |
| 66 | |
| 67 | syslog(pri, fmt, p0, p1, p2, p3, p4) |
| 68 | int pri; |
| 69 | char *fmt; |
| 70 | { |
| 71 | char buf[MAXLINE + 1], outline[MAXLINE + 1]; |
| 72 | register char *b, *f, *o; |
| 73 | register int c; |
| 74 | long now; |
| 75 | int pid, olderrno = errno; |
| 76 | |
| 77 | /* see if we should just throw out this message */ |
| 78 | if ((unsigned) LOG_FAC(pri) >= LOG_NFACILITIES || |
| 79 | LOG_MASK(LOG_PRI(pri)) == 0 || |
| 80 | (pri &~ (LOG_PRIMASK|LOG_FACMASK)) != 0) |
| 81 | return; |
| 82 | if (LogFile < 0 || !connected) |
| 83 | openlog(LogTag, LogStat | LOG_NDELAY, 0); |
| 84 | |
| 85 | /* set default facility if none specified */ |
| 86 | if ((pri & LOG_FACMASK) == 0) |
| 87 | pri |= LogFacility; |
| 88 | |
| 89 | /* build the message */ |
| 90 | o = outline; |
| 91 | (void)sprintf(o, "<%d>", pri); |
| 92 | o += strlen(o); |
| 93 | time(&now); |
| 94 | (void)sprintf(o, "%.15s ", ctime(&now) + 4); |
| 95 | o += strlen(o); |
| 96 | if (LogTag) { |
| 97 | strcpy(o, LogTag); |
| 98 | o += strlen(o); |
| 99 | } |
| 100 | if (LogStat & LOG_PID) { |
| 101 | (void)sprintf(o, "[%d]", getpid()); |
| 102 | o += strlen(o); |
| 103 | } |
| 104 | if (LogTag) { |
| 105 | strcpy(o, ": "); |
| 106 | o += 2; |
| 107 | } |
| 108 | |
| 109 | b = buf; |
| 110 | f = fmt; |
| 111 | while ((c = *f++) != '\0' && c != '\n' && b < &buf[MAXLINE]) { |
| 112 | if (c != '%') { |
| 113 | *b++ = c; |
| 114 | continue; |
| 115 | } |
| 116 | if ((c = *f++) != 'm') { |
| 117 | *b++ = '%'; |
| 118 | *b++ = c; |
| 119 | continue; |
| 120 | } |
| 121 | if ((unsigned)olderrno > sys_nerr) |
| 122 | (void)sprintf(b, "error %d", olderrno); |
| 123 | else |
| 124 | strcpy(b, sys_errlist[olderrno]); |
| 125 | b += strlen(b); |
| 126 | } |
| 127 | *b++ = '\n'; |
| 128 | *b = '\0'; |
| 129 | (void)sprintf(o, buf, p0, p1, p2, p3, p4); |
| 130 | c = strlen(outline); |
| 131 | if (c > MAXLINE) |
| 132 | c = MAXLINE; |
| 133 | |
| 134 | /* output the message to the local logger */ |
| 135 | if (send(LogFile, outline, c, 0) >= 0) |
| 136 | return; |
| 137 | if (!(LogStat & LOG_CONS)) |
| 138 | return; |
| 139 | |
| 140 | /* output the message to the console */ |
| 141 | pid = vfork(); |
| 142 | if (pid == -1) |
| 143 | return; |
| 144 | if (pid == 0) { |
| 145 | int fd; |
| 146 | |
| 147 | signal(SIGALRM, SIG_DFL); |
| 148 | sigsetmask(sigblock(0L) & ~sigmask(SIGALRM)); |
| 149 | alarm(5); |
| 150 | fd = open(ctty, O_WRONLY); |
| 151 | alarm(0); |
| 152 | strcat(o, "\r"); |
| 153 | o = index(outline, '>') + 1; |
| 154 | write(fd, o, c + 1 - (o - outline)); |
| 155 | close(fd); |
| 156 | _exit(0); |
| 157 | } |
| 158 | if (!(LogStat & LOG_NOWAIT)) |
| 159 | while ((c = wait((int *)0)) > 0 && c != pid) |
| 160 | ; |
| 161 | } |
| 162 | |
| 163 | /* |
| 164 | * OPENLOG -- open system log |
| 165 | */ |
| 166 | |
| 167 | openlog(ident, logstat, logfac) |
| 168 | char *ident; |
| 169 | int logstat, logfac; |
| 170 | { |
| 171 | if (ident != NULL) |
| 172 | LogTag = ident; |
| 173 | LogStat = logstat; |
| 174 | if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0) |
| 175 | LogFacility = logfac; |
| 176 | if (LogFile == -1) { |
| 177 | SyslogAddr.sa_family = AF_UNIX; |
| 178 | strncpy(SyslogAddr.sa_data, logname, sizeof SyslogAddr.sa_data); |
| 179 | if (LogStat & LOG_NDELAY) { |
| 180 | LogFile = socket(AF_UNIX, SOCK_DGRAM, 0); |
| 181 | fcntl(LogFile, F_SETFD, 1); |
| 182 | } |
| 183 | } |
| 184 | if (LogFile != -1 && !connected && |
| 185 | connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) != -1) |
| 186 | connected = 1; |
| 187 | } |
| 188 | |
| 189 | /* |
| 190 | * CLOSELOG -- close the system log |
| 191 | */ |
| 192 | |
| 193 | closelog() |
| 194 | { |
| 195 | |
| 196 | (void) close(LogFile); |
| 197 | LogFile = -1; |
| 198 | connected = 0; |
| 199 | } |
| 200 | |
| 201 | /* |
| 202 | * SETLOGMASK -- set the log mask level |
| 203 | */ |
| 204 | setlogmask(pmask) |
| 205 | int pmask; |
| 206 | { |
| 207 | int omask; |
| 208 | |
| 209 | omask = LogMask; |
| 210 | if (pmask != 0) |
| 211 | LogMask = pmask; |
| 212 | return (omask); |
| 213 | } |