Commit | Line | Data |
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b97c7a10 | 1 | #ifndef lint |
043efade | 2 | static char sccsid[] = "@(#)syslog.c 4.7 (Berkeley) %G%"; |
b97c7a10 SL |
3 | #endif |
4 | ||
5 | /* | |
6 | * SYSLOG -- print message on log file | |
7 | * | |
8 | * This routine looks a lot like printf, except that it | |
9 | * outputs to the log file instead of the standard output. | |
bc51229a RC |
10 | * Also: |
11 | * adds a timestamp, | |
12 | * prints the module name in front of the message, | |
13 | * has some other formatting types (or will sometime), | |
14 | * adds a newline on the end of the message. | |
b97c7a10 | 15 | * |
bc51229a | 16 | * The output of this routine is intended to be read by /etc/syslogd. |
4d707151 RC |
17 | * |
18 | * Author: Eric Allman | |
19 | * Modified to use UNIX domain IPC by Ralph Campbell | |
b97c7a10 | 20 | */ |
bc51229a | 21 | |
b97c7a10 SL |
22 | #include <sys/types.h> |
23 | #include <sys/socket.h> | |
bc51229a | 24 | #include <sys/file.h> |
b97c7a10 SL |
25 | #include <syslog.h> |
26 | #include <netdb.h> | |
27 | ||
bc51229a RC |
28 | #define MAXLINE 1024 /* max message size */ |
29 | #define NULL 0 /* manifest */ | |
30 | ||
5cd7a5ab RC |
31 | #define mask(p) (1 << (p)) |
32 | #define IMPORTANT (mask(KERN_EMERG)|mask(KERN_ALERT)|mask(KERN_ERR)|mask(KERN_FAIL)\ | |
33 | |mask(KERN_RECOV)|mask(KERN_INFO)|mask(LOG_EMERG)|mask(LOG_ALERT)\ | |
34 | |mask(LOG_CRIT)|mask(LOG_ERR)|mask(LOG_FAIL)) | |
35 | ||
bc51229a RC |
36 | static char logname[] = "/dev/log"; |
37 | static char ctty[] = "/dev/console"; | |
b97c7a10 | 38 | |
bc51229a RC |
39 | static int LogFile = -1; /* fd for log */ |
40 | static int LogStat = 0; /* status bits, set by openlog() */ | |
41 | static char *LogTag = NULL; /* string to tag the entry with */ | |
043efade RC |
42 | /* mask of priorities to be logged */ |
43 | static int LogMask = ~(mask(KERN_EMERG)|mask(KERN_ALERT)|mask(KERN_ERR)| | |
44 | mask(KERN_FAIL)|mask(KERN_RECOV)|mask(KERN_INFO)); | |
b97c7a10 | 45 | |
bc51229a | 46 | static struct sockaddr SyslogAddr; |
b97c7a10 SL |
47 | |
48 | extern int errno, sys_nerr; | |
49 | extern char *sys_errlist[]; | |
50 | ||
51 | syslog(pri, fmt, p0, p1, p2, p3, p4) | |
52 | int pri; | |
53 | char *fmt; | |
54 | { | |
bc51229a RC |
55 | char buf[MAXLINE + 1], outline[MAXLINE + 1]; |
56 | register char *b, *f, *o; | |
57 | register int c; | |
58 | long now; | |
4d707151 | 59 | int pid, olderrno = errno; |
b97c7a10 | 60 | |
b97c7a10 | 61 | /* see if we should just throw out this message */ |
5cd7a5ab | 62 | if (pri <= 0 || pri >= 32 || (mask(pri) & LogMask) == 0) |
b97c7a10 | 63 | return; |
bc51229a | 64 | if (LogFile < 0) |
5cd7a5ab | 65 | openlog(LogTag, LogStat & ~LOG_ODELAY, 0); |
bc51229a | 66 | o = outline; |
4d707151 RC |
67 | sprintf(o, "<%d>", pri); |
68 | o += strlen(o); | |
bc51229a RC |
69 | if (LogTag) { |
70 | strcpy(o, LogTag); | |
71 | o += strlen(o); | |
72 | } | |
73 | if (LogStat & LOG_PID) { | |
4d707151 | 74 | sprintf(o, "[%d]", getpid()); |
bc51229a RC |
75 | o += strlen(o); |
76 | } | |
77 | time(&now); | |
4d707151 | 78 | sprintf(o, ": %.15s-- ", ctime(&now) + 4); |
bc51229a | 79 | o += strlen(o); |
b97c7a10 | 80 | |
bc51229a RC |
81 | b = buf; |
82 | f = fmt; | |
83 | while ((c = *f++) != '\0' && c != '\n' && b < &buf[MAXLINE]) { | |
84 | if (c != '%') { | |
85 | *b++ = c; | |
86 | continue; | |
b97c7a10 | 87 | } |
bc51229a RC |
88 | if ((c = *f++) != 'm') { |
89 | *b++ = '%'; | |
90 | *b++ = c; | |
91 | continue; | |
b97c7a10 | 92 | } |
4d707151 RC |
93 | if ((unsigned)olderrno > sys_nerr) |
94 | sprintf(b, "error %d", olderrno); | |
b97c7a10 | 95 | else |
4d707151 | 96 | strcpy(b, sys_errlist[olderrno]); |
bc51229a | 97 | b += strlen(b); |
b97c7a10 | 98 | } |
bc51229a RC |
99 | *b++ = '\n'; |
100 | *b = '\0'; | |
101 | sprintf(o, buf, p0, p1, p2, p3, p4); | |
102 | c = strlen(outline); | |
103 | if (c > MAXLINE) | |
104 | c = MAXLINE; | |
105 | if (sendto(LogFile, outline, c, 0, &SyslogAddr, sizeof SyslogAddr) >= 0) | |
106 | return; | |
5cd7a5ab | 107 | if (!(LogStat & LOG_CONS) && !(mask(pri) & IMPORTANT)) |
bc51229a RC |
108 | return; |
109 | pid = fork(); | |
110 | if (pid == -1) | |
111 | return; | |
112 | if (pid == 0) { | |
113 | LogFile = open(ctty, O_RDWR); | |
5cd7a5ab RC |
114 | strcat(o, "\r"); |
115 | write(LogFile, outline, c+1); | |
bc51229a RC |
116 | close(LogFile); |
117 | exit(0); | |
118 | } | |
4d707151 | 119 | while ((c = wait((int *)0)) > 0 && c != pid) |
bc51229a | 120 | ; |
b97c7a10 SL |
121 | } |
122 | ||
123 | /* | |
124 | * OPENLOG -- open system log | |
125 | */ | |
bc51229a | 126 | openlog(ident, logstat, logmask) |
b97c7a10 | 127 | char *ident; |
bc51229a | 128 | int logstat, logmask; |
b97c7a10 | 129 | { |
b97c7a10 | 130 | |
4d707151 | 131 | LogTag = (ident != NULL) ? ident : "syslog"; |
b97c7a10 | 132 | LogStat = logstat; |
df714f23 | 133 | if (logmask != 0) |
bc51229a | 134 | LogMask = logmask; |
b97c7a10 SL |
135 | if (LogFile >= 0) |
136 | return; | |
bc51229a RC |
137 | SyslogAddr.sa_family = AF_UNIX; |
138 | strncpy(SyslogAddr.sa_data, logname, sizeof SyslogAddr.sa_data); | |
5cd7a5ab RC |
139 | if (!(LogStat & LOG_ODELAY)) { |
140 | LogFile = socket(AF_UNIX, SOCK_DGRAM, 0); | |
141 | fcntl(LogFile, F_SETFD, 1); | |
142 | } | |
b97c7a10 SL |
143 | } |
144 | ||
145 | /* | |
146 | * CLOSELOG -- close the system log | |
147 | */ | |
148 | closelog() | |
149 | { | |
150 | ||
151 | (void) close(LogFile); | |
152 | LogFile = -1; | |
153 | } | |
bc51229a RC |
154 | |
155 | /* | |
156 | * SETLOGMASK -- set the log mask level | |
157 | */ | |
df714f23 RC |
158 | setlogmask(pmask) |
159 | int pmask; | |
bc51229a | 160 | { |
df714f23 | 161 | int omask; |
bc51229a | 162 | |
df714f23 RC |
163 | omask = LogMask; |
164 | if (pmask != 0) | |
165 | LogMask = pmask; | |
166 | return (omask); | |
bc51229a | 167 | } |