Commit | Line | Data |
---|---|---|
bb0cfa24 DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
b97c7a10 | 7 | #ifndef lint |
bb0cfa24 DF |
8 | static char sccsid[] = "@(#)syslog.c 5.1 (Berkeley) %G%"; |
9 | #endif not lint | |
b97c7a10 SL |
10 | |
11 | /* | |
12 | * SYSLOG -- print message on log file | |
13 | * | |
14 | * This routine looks a lot like printf, except that it | |
15 | * outputs to the log file instead of the standard output. | |
bc51229a RC |
16 | * Also: |
17 | * adds a timestamp, | |
18 | * prints the module name in front of the message, | |
19 | * has some other formatting types (or will sometime), | |
20 | * adds a newline on the end of the message. | |
b97c7a10 | 21 | * |
bc51229a | 22 | * The output of this routine is intended to be read by /etc/syslogd. |
4d707151 RC |
23 | * |
24 | * Author: Eric Allman | |
25 | * Modified to use UNIX domain IPC by Ralph Campbell | |
b97c7a10 | 26 | */ |
bc51229a | 27 | |
b97c7a10 SL |
28 | #include <sys/types.h> |
29 | #include <sys/socket.h> | |
bc51229a | 30 | #include <sys/file.h> |
b97c7a10 SL |
31 | #include <syslog.h> |
32 | #include <netdb.h> | |
33 | ||
bc51229a RC |
34 | #define MAXLINE 1024 /* max message size */ |
35 | #define NULL 0 /* manifest */ | |
36 | ||
5cd7a5ab RC |
37 | #define mask(p) (1 << (p)) |
38 | #define IMPORTANT (mask(KERN_EMERG)|mask(KERN_ALERT)|mask(KERN_ERR)|mask(KERN_FAIL)\ | |
39 | |mask(KERN_RECOV)|mask(KERN_INFO)|mask(LOG_EMERG)|mask(LOG_ALERT)\ | |
40 | |mask(LOG_CRIT)|mask(LOG_ERR)|mask(LOG_FAIL)) | |
41 | ||
bc51229a RC |
42 | static char logname[] = "/dev/log"; |
43 | static char ctty[] = "/dev/console"; | |
b97c7a10 | 44 | |
bc51229a RC |
45 | static int LogFile = -1; /* fd for log */ |
46 | static int LogStat = 0; /* status bits, set by openlog() */ | |
47 | static char *LogTag = NULL; /* string to tag the entry with */ | |
043efade RC |
48 | /* mask of priorities to be logged */ |
49 | static int LogMask = ~(mask(KERN_EMERG)|mask(KERN_ALERT)|mask(KERN_ERR)| | |
50 | mask(KERN_FAIL)|mask(KERN_RECOV)|mask(KERN_INFO)); | |
b97c7a10 | 51 | |
bc51229a | 52 | static struct sockaddr SyslogAddr; |
b97c7a10 SL |
53 | |
54 | extern int errno, sys_nerr; | |
55 | extern char *sys_errlist[]; | |
56 | ||
57 | syslog(pri, fmt, p0, p1, p2, p3, p4) | |
58 | int pri; | |
59 | char *fmt; | |
60 | { | |
bc51229a RC |
61 | char buf[MAXLINE + 1], outline[MAXLINE + 1]; |
62 | register char *b, *f, *o; | |
63 | register int c; | |
64 | long now; | |
4d707151 | 65 | int pid, olderrno = errno; |
b97c7a10 | 66 | |
b97c7a10 | 67 | /* see if we should just throw out this message */ |
5cd7a5ab | 68 | if (pri <= 0 || pri >= 32 || (mask(pri) & LogMask) == 0) |
b97c7a10 | 69 | return; |
bc51229a | 70 | if (LogFile < 0) |
5cd7a5ab | 71 | openlog(LogTag, LogStat & ~LOG_ODELAY, 0); |
bc51229a | 72 | o = outline; |
4d707151 RC |
73 | sprintf(o, "<%d>", pri); |
74 | o += strlen(o); | |
bc51229a RC |
75 | if (LogTag) { |
76 | strcpy(o, LogTag); | |
77 | o += strlen(o); | |
78 | } | |
79 | if (LogStat & LOG_PID) { | |
4d707151 | 80 | sprintf(o, "[%d]", getpid()); |
bc51229a RC |
81 | o += strlen(o); |
82 | } | |
83 | time(&now); | |
4d707151 | 84 | sprintf(o, ": %.15s-- ", ctime(&now) + 4); |
bc51229a | 85 | o += strlen(o); |
b97c7a10 | 86 | |
bc51229a RC |
87 | b = buf; |
88 | f = fmt; | |
89 | while ((c = *f++) != '\0' && c != '\n' && b < &buf[MAXLINE]) { | |
90 | if (c != '%') { | |
91 | *b++ = c; | |
92 | continue; | |
b97c7a10 | 93 | } |
bc51229a RC |
94 | if ((c = *f++) != 'm') { |
95 | *b++ = '%'; | |
96 | *b++ = c; | |
97 | continue; | |
b97c7a10 | 98 | } |
4d707151 RC |
99 | if ((unsigned)olderrno > sys_nerr) |
100 | sprintf(b, "error %d", olderrno); | |
b97c7a10 | 101 | else |
4d707151 | 102 | strcpy(b, sys_errlist[olderrno]); |
bc51229a | 103 | b += strlen(b); |
b97c7a10 | 104 | } |
bc51229a RC |
105 | *b++ = '\n'; |
106 | *b = '\0'; | |
107 | sprintf(o, buf, p0, p1, p2, p3, p4); | |
108 | c = strlen(outline); | |
109 | if (c > MAXLINE) | |
110 | c = MAXLINE; | |
111 | if (sendto(LogFile, outline, c, 0, &SyslogAddr, sizeof SyslogAddr) >= 0) | |
112 | return; | |
5cd7a5ab | 113 | if (!(LogStat & LOG_CONS) && !(mask(pri) & IMPORTANT)) |
bc51229a RC |
114 | return; |
115 | pid = fork(); | |
116 | if (pid == -1) | |
117 | return; | |
118 | if (pid == 0) { | |
119 | LogFile = open(ctty, O_RDWR); | |
5cd7a5ab RC |
120 | strcat(o, "\r"); |
121 | write(LogFile, outline, c+1); | |
bc51229a RC |
122 | close(LogFile); |
123 | exit(0); | |
124 | } | |
4d707151 | 125 | while ((c = wait((int *)0)) > 0 && c != pid) |
bc51229a | 126 | ; |
b97c7a10 SL |
127 | } |
128 | ||
129 | /* | |
130 | * OPENLOG -- open system log | |
131 | */ | |
bc51229a | 132 | openlog(ident, logstat, logmask) |
b97c7a10 | 133 | char *ident; |
bc51229a | 134 | int logstat, logmask; |
b97c7a10 | 135 | { |
b97c7a10 | 136 | |
4d707151 | 137 | LogTag = (ident != NULL) ? ident : "syslog"; |
b97c7a10 | 138 | LogStat = logstat; |
df714f23 | 139 | if (logmask != 0) |
bc51229a | 140 | LogMask = logmask; |
b97c7a10 SL |
141 | if (LogFile >= 0) |
142 | return; | |
bc51229a RC |
143 | SyslogAddr.sa_family = AF_UNIX; |
144 | strncpy(SyslogAddr.sa_data, logname, sizeof SyslogAddr.sa_data); | |
5cd7a5ab RC |
145 | if (!(LogStat & LOG_ODELAY)) { |
146 | LogFile = socket(AF_UNIX, SOCK_DGRAM, 0); | |
147 | fcntl(LogFile, F_SETFD, 1); | |
148 | } | |
b97c7a10 SL |
149 | } |
150 | ||
151 | /* | |
152 | * CLOSELOG -- close the system log | |
153 | */ | |
154 | closelog() | |
155 | { | |
156 | ||
157 | (void) close(LogFile); | |
158 | LogFile = -1; | |
159 | } | |
bc51229a RC |
160 | |
161 | /* | |
162 | * SETLOGMASK -- set the log mask level | |
163 | */ | |
df714f23 RC |
164 | setlogmask(pmask) |
165 | int pmask; | |
bc51229a | 166 | { |
df714f23 | 167 | int omask; |
bc51229a | 168 | |
df714f23 RC |
169 | omask = LogMask; |
170 | if (pmask != 0) | |
171 | LogMask = pmask; | |
172 | return (omask); | |
bc51229a | 173 | } |