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b367af20 WJ |
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, 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 5.34 (Berkeley) 6/26/91"; | |
36 | #endif /* LIBC_SCCS and not lint */ | |
37 | ||
38 | #include <sys/types.h> | |
39 | #include <sys/socket.h> | |
40 | #include <sys/file.h> | |
41 | #include <sys/syslog.h> | |
42 | #include <sys/uio.h> | |
43 | #include <sys/errno.h> | |
44 | #include <netdb.h> | |
45 | #include <string.h> | |
46 | #if __STDC__ | |
47 | #include <stdarg.h> | |
48 | #else | |
49 | #include <varargs.h> | |
50 | #endif | |
51 | #include <time.h> | |
52 | #include <unistd.h> | |
53 | #include <paths.h> | |
54 | #include <stdio.h> | |
55 | ||
56 | static int LogFile = -1; /* fd for log */ | |
57 | static int connected; /* have done connect */ | |
58 | static int LogStat = 0; /* status bits, set by openlog() */ | |
59 | static const char *LogTag = "syslog"; /* string to tag the entry with */ | |
60 | static int LogFacility = LOG_USER; /* default facility code */ | |
61 | static int LogMask = 0xff; /* mask of priorities to be logged */ | |
62 | ||
63 | /* | |
64 | * syslog, vsyslog -- | |
65 | * print message on log file; output is intended for syslogd(8). | |
66 | */ | |
67 | void | |
68 | #if __STDC__ | |
69 | syslog(int pri, const char *fmt, ...) | |
70 | #else | |
71 | syslog(pri, fmt, va_alist) | |
72 | int pri; | |
73 | char *fmt; | |
74 | va_dcl | |
75 | #endif | |
76 | { | |
77 | va_list ap; | |
78 | ||
79 | #if __STDC__ | |
80 | va_start(ap, fmt); | |
81 | #else | |
82 | va_start(ap); | |
83 | #endif | |
84 | vsyslog(pri, fmt, ap); | |
85 | va_end(ap); | |
86 | } | |
87 | ||
88 | void | |
89 | vsyslog(pri, fmt, ap) | |
90 | int pri; | |
91 | register const char *fmt; | |
92 | va_list ap; | |
93 | { | |
94 | register int cnt; | |
95 | register char *p; | |
96 | time_t now, time(); | |
97 | int fd, saved_errno; | |
98 | char tbuf[2048], fmt_cpy[1024], *stdp, *ctime(); | |
99 | ||
100 | /* check for invalid bits or no priority set */ | |
101 | if (!LOG_PRI(pri) || (pri &~ (LOG_PRIMASK|LOG_FACMASK)) || | |
102 | !(LOG_MASK(pri) & LogMask)) | |
103 | return; | |
104 | ||
105 | saved_errno = errno; | |
106 | ||
107 | /* set default facility if none specified */ | |
108 | if ((pri & LOG_FACMASK) == 0) | |
109 | pri |= LogFacility; | |
110 | ||
111 | /* build the message */ | |
112 | (void)time(&now); | |
113 | (void)sprintf(tbuf, "<%d>%.15s ", pri, ctime(&now) + 4); | |
114 | for (p = tbuf; *p; ++p); | |
115 | if (LogStat & LOG_PERROR) | |
116 | stdp = p; | |
117 | if (LogTag) { | |
118 | (void)strcpy(p, LogTag); | |
119 | for (; *p; ++p); | |
120 | } | |
121 | if (LogStat & LOG_PID) { | |
122 | (void)sprintf(p, "[%d]", getpid()); | |
123 | for (; *p; ++p); | |
124 | } | |
125 | if (LogTag) { | |
126 | *p++ = ':'; | |
127 | *p++ = ' '; | |
128 | } | |
129 | ||
130 | /* substitute error message for %m */ | |
131 | { | |
132 | register char ch, *t1, *t2; | |
133 | char *strerror(); | |
134 | ||
135 | for (t1 = fmt_cpy; ch = *fmt; ++fmt) | |
136 | if (ch == '%' && fmt[1] == 'm') { | |
137 | ++fmt; | |
138 | for (t2 = strerror(saved_errno); | |
139 | *t1 = *t2++; ++t1); | |
140 | } | |
141 | else | |
142 | *t1++ = ch; | |
143 | *t1 = '\0'; | |
144 | } | |
145 | ||
146 | (void)vsprintf(p, fmt_cpy, ap); | |
147 | ||
148 | cnt = strlen(tbuf); | |
149 | ||
150 | /* output to stderr if requested */ | |
151 | if (LogStat & LOG_PERROR) { | |
152 | struct iovec iov[2]; | |
153 | register struct iovec *v = iov; | |
154 | ||
155 | v->iov_base = stdp; | |
156 | v->iov_len = cnt - (stdp - tbuf); | |
157 | ++v; | |
158 | v->iov_base = "\n"; | |
159 | v->iov_len = 1; | |
160 | (void)writev(STDERR_FILENO, iov, 2); | |
161 | } | |
162 | ||
163 | /* get connected, output the message to the local logger */ | |
164 | if (!connected) | |
165 | openlog(LogTag, LogStat | LOG_NDELAY, 0); | |
166 | if (send(LogFile, tbuf, cnt, 0) >= 0) | |
167 | return; | |
168 | ||
169 | /* see if should attempt the console */ | |
170 | if (!(LogStat&LOG_CONS)) | |
171 | return; | |
172 | ||
173 | /* | |
174 | * Output the message to the console; don't worry about blocking, | |
175 | * if console blocks everything will. Make sure the error reported | |
176 | * is the one from the syslogd failure. | |
177 | */ | |
178 | if ((fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) { | |
179 | (void)strcat(tbuf, "\r\n"); | |
180 | cnt += 2; | |
181 | p = index(tbuf, '>') + 1; | |
182 | (void)write(fd, p, cnt - (p - tbuf)); | |
183 | (void)close(fd); | |
184 | } | |
185 | } | |
186 | ||
187 | static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */ | |
188 | ||
189 | void | |
190 | openlog(ident, logstat, logfac) | |
191 | const char *ident; | |
192 | int logstat, logfac; | |
193 | { | |
194 | if (ident != NULL) | |
195 | LogTag = ident; | |
196 | LogStat = logstat; | |
197 | if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0) | |
198 | LogFacility = logfac; | |
199 | ||
200 | if (LogFile == -1) { | |
201 | SyslogAddr.sa_family = AF_UNIX; | |
202 | (void)strncpy(SyslogAddr.sa_data, _PATH_LOG, | |
203 | sizeof(SyslogAddr.sa_data)); | |
204 | if (LogStat & LOG_NDELAY) { | |
205 | if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) | |
206 | return; | |
207 | (void)fcntl(LogFile, F_SETFD, 1); | |
208 | } | |
209 | } | |
210 | if (LogFile != -1 && !connected) | |
211 | if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) { | |
212 | (void)close(LogFile); | |
213 | LogFile = -1; | |
214 | } else | |
215 | connected = 1; | |
216 | } | |
217 | ||
218 | void | |
219 | closelog() | |
220 | { | |
221 | (void)close(LogFile); | |
222 | LogFile = -1; | |
223 | connected = 0; | |
224 | } | |
225 | ||
226 | /* setlogmask -- set the log mask level */ | |
227 | setlogmask(pmask) | |
228 | int pmask; | |
229 | { | |
230 | int omask; | |
231 | ||
232 | omask = LogMask; | |
233 | if (pmask != 0) | |
234 | LogMask = pmask; | |
235 | return (omask); | |
236 | } |