thttpd/syslog.c

/* This is a special version of syslog.c that has been modified to
** always use network sockets, so that it can be called from within
** a chroot() tree.  It has also been made more portable.  -JP
*/

/*
 * Copyright (c) 1983, 1988, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifdef __alpha
#define _XOPEN_SOURCE_EXTENDED
#endif

/* Always use a network socket.  This lets us run in a chroot() tree. */
#define USE_INET

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)syslog.c    8.9 (Berkeley) 9/4/95";
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#ifdef USE_INET
#include <netinet/in.h>
#include <arpa/inet.h>
#endif
#include <syslog.h>
#include <netdb.h>

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#ifdef HAVE_PATHS_H
# include <paths.h>
#endif
#ifndef _PATH_CONSOLE
# define _PATH_CONSOLE  "/dev/console"
#endif
#ifndef _PATH_LOG
# define _PATH_LOG      "/dev/log"
#endif

#include <stdarg.h>

#ifndef HAVE_STRERROR
char *strerror(int);
#endif

#ifndef LOG_PRI
# define LOG_PRI(p)     ((p) & LOG_PRIMASK)
#endif

#ifndef LOG_PERROR
# define LOG_PERROR     0
#endif

#ifndef STDERR_FILENO
#define STDERR_FILENO 2
#endif

#define BUFSLOP         1024    /* overflow space */

static int      LogFile = -1;           /* fd for log */
static int      connected;              /* have done connect */
static int      LogStat = 0;            /* status bits, set by openlog() */
static const char *LogTag = NULL;       /* string to tag the entry with */
static int      LogFacility = LOG_USER; /* default facility code */
static int      LogMask = 0xff;         /* mask of priorities to be logged */
#ifdef HAVE__PROGNAME
extern char     *__progname;            /* Program name, from crt0. */
#else
char            *__progname = NULL;
#endif

void syslog(int pri, const char *fmt, ...);
void openlog(const char *ident, int logstat, int logfac);
void closelog(void);

/*
 * syslog --
 *      print message on log file; output is intended for syslogd(8).
 */
void
syslog(int pri, const char *fmt, ...)
{
        register int cnt;
        register char ch, *p, *t;
        time_t now;
        int fd, saved_errno;
#ifndef HAVE_VSNPRINTF
        int panic = 0;
#endif
        static int maxsend = BUFSIZ;
        char *stdp, fmt_cpy[1024], tbuf[BUFSIZ + BUFSLOP];
        va_list ap;

#define INTERNALLOG     LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
        /* Check for invalid bits. */
        if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
                syslog(INTERNALLOG,
                    "syslog: unknown facility/priority: %x", pri);
                pri &= LOG_PRIMASK|LOG_FACMASK;
        }

        /* Check priority against setlogmask values. */
        if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
                return;

        saved_errno = errno;

        /* Set default facility if none specified. */
        if ((pri & LOG_FACMASK) == 0)
                pri |= LogFacility;

        /* Get connected. */
        if (!connected)
                openlog(LogTag, LogStat | LOG_NDELAY, 0);

        /* Build the message. */
        (void)time(&now);
        sprintf(tbuf, "<%d>", pri);
        p = tbuf + strlen(tbuf);
        strftime(p, sizeof (tbuf) - (p - tbuf), "%h %e %T ", localtime(&now));
        p += strlen(p);
        stdp = p;
        if (LogTag == NULL)
                LogTag = __progname;
        if (LogTag != NULL) {
                char *q = strrchr(LogTag, '/');

                if (q != NULL)
                        LogTag = ++q;
                sprintf(p, "%.20s", LogTag);
                p += strlen(p);
        }
        if (LogStat & LOG_PID) {
                sprintf(p, "[%ld]", (long) getpid());
                p += strlen(p);
        }
        if (LogTag != NULL) {
                *p++ = ':';
                *p++ = ' ';
        }

        /* Substitute error message for %m. */
        for (t = fmt_cpy; (ch = *fmt) != '\0'; ++fmt)
                if (ch == '%' && fmt[1] == 'm') {
                        ++fmt;
                        strcpy(t, strerror(saved_errno));
                        t += strlen(t);
                } else
                        *t++ = ch;
        *t = '\0';

        va_start(ap, fmt);
#ifdef HAVE_VSNPRINTF
        cnt = maxsend - (p - tbuf) + 1;
        p += vsnprintf(p, cnt, fmt_cpy, ap);
        cnt = p - tbuf;
#else
        vsprintf(p, fmt_cpy, ap);
        p += strlen(p);
        cnt = p - tbuf;
        if (cnt > sizeof tbuf) {
                /* Panic condition. */
                panic = 1;
        }
        if (cnt > maxsend)
                cnt = maxsend;
#endif
        va_end(ap);

        /* Output to stderr if requested. */
        if (LogStat & LOG_PERROR) {
                struct iovec iov[2];
                register struct iovec *v = iov;

                v->iov_base = stdp;
                v->iov_len = cnt - (stdp - tbuf);
                ++v;
                v->iov_base = "\n";
                v->iov_len = 1;
                (void)writev(STDERR_FILENO, iov, 2);
        }

        /* Output the message to the local logger. */
        for (;;) {
                if (send(LogFile, tbuf, cnt, 0) >= 0)
                        goto done;
                if (errno != EMSGSIZE || maxsend <= 256)
                        break;

                /* Message was too large -- back it off. */
                do {
                        maxsend -= 128;
                } while (cnt < maxsend && maxsend > 256);
                cnt = maxsend;
        }

        /*
         * Output the message to the console; don't worry about blocking,
         * if console blocks everything will.  Make sure the error reported
         * is the one from the syslogd failure.
         */
        if (LogStat & LOG_CONS &&
            (fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) {
                (void)strcat(tbuf, "\r\n");
                cnt += 2;
                p = strchr(tbuf, '>') + 1;
                (void)write(fd, p, cnt - (p - tbuf));
                (void)close(fd);
        }

  done: ;
#ifndef HAVE_VSNPRINTF
        /*
         * If we had a buffer overrun, log a panic and abort.
         * We can't return because our stack is probably toast.
         */
        if (panic) {
                syslog(LOG_EMERG, "SYSLOG BUFFER OVERRUN -- EXITING");
                abort();
        }
#endif
}

static struct sockaddr SyslogAddr;      /* AF_UNIX address of local logger */

void
openlog(const char *ident, int logstat, int logfac)
{
        if (ident != NULL)
                LogTag = ident;
        LogStat = logstat;
        if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
                LogFacility = logfac;

        if (LogFile == -1) {
#ifndef USE_INET
                SyslogAddr.sa_family = AF_UNIX;
                (void)strncpy(SyslogAddr.sa_data, _PATH_LOG,
                    sizeof(SyslogAddr.sa_data));
                if (LogStat & LOG_NDELAY) {
                        if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
                                return;
                        (void)fcntl(LogFile, F_SETFD, 1);
                }
#else
#define satosin(sa)     ((struct sockaddr_in *)(sa))

                satosin(&SyslogAddr)->sin_family = AF_INET;
                satosin(&SyslogAddr)->sin_port = 514;
                satosin(&SyslogAddr)->sin_addr.s_addr = inet_addr("127.0.0.1");
                if (LogStat & LOG_NDELAY) {
                        if ((LogFile = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
                                return;
                        (void)fcntl(LogFile, F_SETFD, 1);
                        if (connect(LogFile, &SyslogAddr,
                            sizeof(SyslogAddr)) < 0) {
                                closelog();
                                return;
                        }
                }
#endif
        }
        if (LogFile != -1 && !connected) {
                if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) {
                        (void)close(LogFile);
                        LogFile = -1;
                } else
                        connected = 1;
        }
}

void
closelog(void)
{
        (void)close(LogFile);
        LogFile = -1;
        connected = 0;
}

#ifdef notdef
/* setlogmask -- set the log mask level */
int
setlogmask(int pmask)
{
        int omask;

        omask = LogMask;
        if (pmask != 0)
                LogMask = pmask;
        return (omask);
}
#endif
Revision:	1.1
Committed:	Mon Jun 18 21:11:57 2001 UTC (23 years ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	mp_j, dp_j, cp_j, HEAD
Branch point for:	connpatch, dirpatch, mmapppatch
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	/* This is a special version of syslog.c that has been modified to
2			** always use network sockets, so that it can be called from within
3			** a chroot() tree. It has also been made more portable. -JP
4			*/
5
6			/*
7			* Copyright (c) 1983, 1988, 1993
8			* The Regents of the University of California. All rights reserved.
9			*
10			* Redistribution and use in source and binary forms, with or without
11			* modification, are permitted provided that the following conditions
12			* are met:
13			* 1. Redistributions of source code must retain the above copyright
14			* notice, this list of conditions and the following disclaimer.
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in the
17			* documentation and/or other materials provided with the distribution.
18			* 3. All advertising materials mentioning features or use of this software
19			* must display the following acknowledgement:
20			* This product includes software developed by the University of
21			* California, Berkeley and its contributors.
22			* 4. Neither the name of the University nor the names of its contributors
23			* may be used to endorse or promote products derived from this software
24			* without specific prior written permission.
25			*
26			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36			* SUCH DAMAGE.
37			*/
38
39			#ifdef __alpha
40			#define _XOPEN_SOURCE_EXTENDED
41			#endif
42
43			/* Always use a network socket. This lets us run in a chroot() tree. */
44			#define USE_INET
45
46			#if defined(LIBC_SCCS) && !defined(lint)
47			static char sccsid[] = "@(#)syslog.c 8.9 (Berkeley) 9/4/95";
48			#endif /* LIBC_SCCS and not lint */
49
50			#include <sys/param.h>
51			#include <sys/types.h>
52			#include <sys/socket.h>
53			#include <sys/uio.h>
54			#ifdef USE_INET
55			#include <netinet/in.h>
56			#include <arpa/inet.h>
57			#endif
58			#include <syslog.h>
59			#include <netdb.h>
60
61			#include <errno.h>
62			#include <fcntl.h>
63			#include <stdio.h>
64			#include <string.h>
65			#include <time.h>
66			#include <unistd.h>
67
68			#ifdef HAVE_PATHS_H
69			# include <paths.h>
70			#endif
71			#ifndef _PATH_CONSOLE
72			# define _PATH_CONSOLE "/dev/console"
73			#endif
74			#ifndef _PATH_LOG
75			# define _PATH_LOG "/dev/log"
76			#endif
77
78			#include <stdarg.h>
79
80			#ifndef HAVE_STRERROR
81			char *strerror(int);
82			#endif
83
84			#ifndef LOG_PRI
85			# define LOG_PRI(p) ((p) & LOG_PRIMASK)
86			#endif
87
88			#ifndef LOG_PERROR
89			# define LOG_PERROR 0
90			#endif
91
92			#ifndef STDERR_FILENO
93			#define STDERR_FILENO 2
94			#endif
95
96			#define BUFSLOP 1024 /* overflow space */
97
98			static int LogFile = -1; /* fd for log */
99			static int connected; /* have done connect */
100			static int LogStat = 0; /* status bits, set by openlog() */
101			static const char LogTag = NULL; / string to tag the entry with */
102			static int LogFacility = LOG_USER; /* default facility code */
103			static int LogMask = 0xff; /* mask of priorities to be logged */
104			#ifdef HAVE__PROGNAME
105			extern char __progname; / Program name, from crt0. */
106			#else
107			char *__progname = NULL;
108			#endif
109
110			void syslog(int pri, const char *fmt, ...);
111			void openlog(const char *ident, int logstat, int logfac);
112			void closelog(void);
113
114			/*
115			* syslog --
116			* print message on log file; output is intended for syslogd(8).
117			*/
118			void
119			syslog(int pri, const char *fmt, ...)
120			{
121			register int cnt;
122			register char ch, p, t;
123			time_t now;
124			int fd, saved_errno;
125			#ifndef HAVE_VSNPRINTF
126			int panic = 0;
127			#endif
128			static int maxsend = BUFSIZ;
129			char *stdp, fmt_cpy[1024], tbuf[BUFSIZ + BUFSLOP];
130			va_list ap;
131
132			#define INTERNALLOG LOG_ERR\|LOG_CONS\|LOG_PERROR\|LOG_PID
133			/* Check for invalid bits. */
134			if (pri & ~(LOG_PRIMASK\|LOG_FACMASK)) {
135			syslog(INTERNALLOG,
136			"syslog: unknown facility/priority: %x", pri);
137			pri &= LOG_PRIMASK\|LOG_FACMASK;
138			}
139
140			/* Check priority against setlogmask values. */
141			if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
142			return;
143
144			saved_errno = errno;
145
146			/* Set default facility if none specified. */
147			if ((pri & LOG_FACMASK) == 0)
148			pri \|= LogFacility;
149
150			/* Get connected. */
151			if (!connected)
152			openlog(LogTag, LogStat \| LOG_NDELAY, 0);
153
154			/* Build the message. */
155			(void)time(&now);
156			sprintf(tbuf, "<%d>", pri);
157			p = tbuf + strlen(tbuf);
158			strftime(p, sizeof (tbuf) - (p - tbuf), "%h %e %T ", localtime(&now));
159			p += strlen(p);
160			stdp = p;
161			if (LogTag == NULL)
162			LogTag = __progname;
163			if (LogTag != NULL) {
164			char *q = strrchr(LogTag, '/');
165
166			if (q != NULL)
167			LogTag = ++q;
168			sprintf(p, "%.20s", LogTag);
169			p += strlen(p);
170			}
171			if (LogStat & LOG_PID) {
172			sprintf(p, "[%ld]", (long) getpid());
173			p += strlen(p);
174			}
175			if (LogTag != NULL) {
176			*p++ = ':';
177			*p++ = ' ';
178			}
179
180			/* Substitute error message for %m. */
181			for (t = fmt_cpy; (ch = *fmt) != '\0'; ++fmt)
182			if (ch == '%' && fmt[1] == 'm') {
183			++fmt;
184			strcpy(t, strerror(saved_errno));
185			t += strlen(t);
186			} else
187			*t++ = ch;
188			*t = '\0';
189
190			va_start(ap, fmt);
191			#ifdef HAVE_VSNPRINTF
192			cnt = maxsend - (p - tbuf) + 1;
193			p += vsnprintf(p, cnt, fmt_cpy, ap);
194			cnt = p - tbuf;
195			#else
196			vsprintf(p, fmt_cpy, ap);
197			p += strlen(p);
198			cnt = p - tbuf;
199			if (cnt > sizeof tbuf) {
200			/* Panic condition. */
201			panic = 1;
202			}
203			if (cnt > maxsend)
204			cnt = maxsend;
205			#endif
206			va_end(ap);
207
208			/* Output to stderr if requested. */
209			if (LogStat & LOG_PERROR) {
210			struct iovec iov[2];
211			register struct iovec *v = iov;
212
213			v->iov_base = stdp;
214			v->iov_len = cnt - (stdp - tbuf);
215			++v;
216			v->iov_base = "\n";
217			v->iov_len = 1;
218			(void)writev(STDERR_FILENO, iov, 2);
219			}
220
221			/* Output the message to the local logger. */
222			for (;;) {
223			if (send(LogFile, tbuf, cnt, 0) >= 0)
224			goto done;
225			if (errno != EMSGSIZE \|\| maxsend <= 256)
226			break;
227
228			/* Message was too large -- back it off. */
229			do {
230			maxsend -= 128;
231			} while (cnt < maxsend && maxsend > 256);
232			cnt = maxsend;
233			}
234
235			/*
236			* Output the message to the console; don't worry about blocking,
237			* if console blocks everything will. Make sure the error reported
238			* is the one from the syslogd failure.
239			*/
240			if (LogStat & LOG_CONS &&
241			(fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) {
242			(void)strcat(tbuf, "\r\n");
243			cnt += 2;
244			p = strchr(tbuf, '>') + 1;
245			(void)write(fd, p, cnt - (p - tbuf));
246			(void)close(fd);
247			}
248
249			done: ;
250			#ifndef HAVE_VSNPRINTF
251			/*
252			* If we had a buffer overrun, log a panic and abort.
253			* We can't return because our stack is probably toast.
254			*/
255			if (panic) {
256			syslog(LOG_EMERG, "SYSLOG BUFFER OVERRUN -- EXITING");
257			abort();
258			}
259			#endif
260			}
261
262			static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
263
264			void
265			openlog(const char *ident, int logstat, int logfac)
266			{
267			if (ident != NULL)
268			LogTag = ident;
269			LogStat = logstat;
270			if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
271			LogFacility = logfac;
272
273			if (LogFile == -1) {
274			#ifndef USE_INET
275			SyslogAddr.sa_family = AF_UNIX;
276			(void)strncpy(SyslogAddr.sa_data, _PATH_LOG,
277			sizeof(SyslogAddr.sa_data));
278			if (LogStat & LOG_NDELAY) {
279			if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
280			return;
281			(void)fcntl(LogFile, F_SETFD, 1);
282			}
283			#else
284			#define satosin(sa) ((struct sockaddr_in *)(sa))
285
286			satosin(&SyslogAddr)->sin_family = AF_INET;
287			satosin(&SyslogAddr)->sin_port = 514;
288			satosin(&SyslogAddr)->sin_addr.s_addr = inet_addr("127.0.0.1");
289			if (LogStat & LOG_NDELAY) {
290			if ((LogFile = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
291			return;
292			(void)fcntl(LogFile, F_SETFD, 1);
293			if (connect(LogFile, &SyslogAddr,
294			sizeof(SyslogAddr)) < 0) {
295			closelog();
296			return;
297			}
298			}
299			#endif
300			}
301			if (LogFile != -1 && !connected) {
302			if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) {
303			(void)close(LogFile);
304			LogFile = -1;
305			} else
306			connected = 1;
307			}
308			}
309
310			void
311			closelog(void)
312			{
313			(void)close(LogFile);
314			LogFile = -1;
315			connected = 0;
316			}
317
318			#ifdef notdef
319			/* setlogmask -- set the log mask level */
320			int
321			setlogmask(int pmask)
322			{
323			int omask;
324
325			omask = LogMask;
326			if (pmask != 0)
327			LogMask = pmask;
328			return (omask);
329			}
330			#endif