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sysklogd/syslogd.c
Joey Schulze e7509db5e3 * Removed killall-statement from postinst. Thanks to James Troup for 
reporting it.
  * Added chdir("/") to both daemons (fixes: Bug#17601)
1998-01-29 20:40:48 +00:00

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/*
* Copyright (c) 1983, 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#if !defined(lint) && !defined(NO_SCCS)
char copyright2[] =
"@(#) Copyright (c) 1983, 1988 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#if !defined(lint) && !defined(NO_SCCS)
static char sccsid[] = "@(#)syslogd.c 5.27 (Berkeley) 10/10/88";
#endif /* not lint */
/*
* syslogd -- log system messages
*
* This program implements a system log. It takes a series of lines.
* Each line may have a priority, signified as "<n>" as
* the first characters of the line. If this is
* not present, a default priority is used.
*
* To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will
* cause it to reread its configuration file.
*
* Defined Constants:
*
* MAXLINE -- the maximum line length that can be handled.
* DEFUPRI -- the default priority for user messages
* DEFSPRI -- the default priority for kernel messages
*
* Author: Eric Allman
* extensive changes by Ralph Campbell
* more extensive changes by Eric Allman (again)
*
* Steve Lord: Fix UNIX domain socket code, added linux kernel logging
* change defines to
* SYSLOG_INET - listen on a UDP socket
* SYSLOG_UNIXAF - listen on unix domain socket
* SYSLOG_KERNEL - listen to linux kernel
*
* Mon Feb 22 09:55:42 CST 1993: Dr. Wettstein
* Additional modifications to the source. Changed priority scheme
* to increase the level of configurability. In its stock configuration
* syslogd no longer logs all messages of a certain priority and above
* to a log file. The * wildcard is supported to specify all priorities.
* Note that this is a departure from the BSD standard.
*
* Syslogd will now listen to both the inetd and the unixd socket. The
* strategy is to allow all local programs to direct their output to
* syslogd through the unixd socket while the program listens to the
* inetd socket to get messages forwarded from other hosts.
*
* Fri Mar 12 16:55:33 CST 1993: Dr. Wettstein
* Thanks to Stephen Tweedie (dcs.ed.ac.uk!sct) for helpful bug-fixes
* and an enlightened commentary on the prioritization problem.
*
* Changed the priority scheme so that the default behavior mimics the
* standard BSD. In this scenario all messages of a specified priority
* and above are logged.
*
* Add the ability to specify a wildcard (=) as the first character
* of the priority name. Doing this specifies that ONLY messages with
* this level of priority are to be logged. For example:
*
* *.=debug /usr/adm/debug
*
* Would log only messages with a priority of debug to the /usr/adm/debug
* file.
*
* Providing an * as the priority specifies that all messages are to be
* logged. Note that this case is degenerate with specifying a priority
* level of debug. The wildcard * was retained because I believe that
* this is more intuitive.
*
* Thu Jun 24 11:34:13 CDT 1993: Dr. Wettstein
* Modified sources to incorporate changes in libc4.4. Messages from
* syslog are now null-terminated, syslogd code now parses messages
* based on this termination scheme. Linux as of libc4.4 supports the
* fsync system call. Modified code to fsync after all writes to
* log files.
*
* Sat Dec 11 11:59:43 CST 1993: Dr. Wettstein
* Extensive changes to the source code to allow compilation with no
* complaints with -Wall.
*
* Reorganized the facility and priority name arrays so that they
* compatible with the syslog.h source found in /usr/include/syslog.h.
* NOTE that this should really be changed. The reason I do not
* allow the use of the values defined in syslog.h is on account of
* the extensions made to allow the wildcard character in the
* priority field. To fix this properly one should malloc an array,
* copy the contents of the array defined by syslog.h and then
* make whatever modifications that are desired. Next round.
*
* Thu Jan 6 12:07:36 CST 1994: Dr. Wettstein
* Added support for proper decomposition and re-assembly of
* fragment messages on UNIX domain sockets. Lack of this capability
* was causing 'partial' messages to be output. Since facility and
* priority information is encoded as a leader on the messages this
* was causing lines to be placed in erroneous files.
*
* Also added a patch from Shane Alderton (shane@scs.apana.org.au) to
* correct a problem with syslogd dumping core when an attempt was made
* to write log messages to a logged-on user. Thank you.
*
* Many thanks to Juha Virtanen (jiivee@hut.fi) for a series of
* interchanges which lead to the fixing of problems with messages set
* to priorities of none and emerg. Also thanks to Juha for a patch
* to exclude users with a class of LOGIN from receiving messages.
*
* Shane Alderton provided an additional patch to fix zombies which
* were conceived when messages were written to multiple users.
*
* Mon Feb 6 09:57:10 CST 1995: Dr. Wettstein
* Patch to properly reset the single priority message flag. Thanks
* to Christopher Gori for spotting this bug and forwarding a patch.
*
* Wed Feb 22 15:38:31 CST 1995: Dr. Wettstein
* Added version information to startup messages.
*
* Added defines so that paths to important files are taken from
* the definitions in paths.h. Hopefully this will insure that
* everything follows the FSSTND standards. Thanks to Chris Metcalf
* for a set of patches to provide this functionality. Also thanks
* Elias Levy for prompting me to get these into the sources.
*
* Wed Jul 26 18:57:23 MET DST 1995: Martin Schulze
* Linux' gethostname only returns the hostname and not the fqdn as
* expected in the code. But if you call hostname with an fqdn then
* gethostname will return an fqdn, so we have to mention that. This
* has been changed.
*
* The 'LocalDomain' and the hostname of a remote machine is
* converted to lower case, because the original caused some
* inconsistency, because the (at least my) nameserver did respond an
* fqdn containing of upper- _and_ lowercase letters while
* 'LocalDomain' consisted only of lowercase letters and that didn't
* match.
*
* Sat Aug 5 18:59:15 MET DST 1995: Martin Schulze
* Now no messages that were received from any remote host are sent
* out to another. At my domain this missing feature caused ugly
* syslog-loops, sometimes.
*
* Remember that no message is sent out. I can't figure out any
* scenario where it might be useful to change this behavior and to
* send out messages to other hosts than the one from which we
* received the message, but I might be shortsighted. :-/
*
* Thu Aug 10 19:01:08 MET DST 1995: Martin Schulze
* Added my pidfile.[ch] to it to perform a better handling with
* pidfiles. Now both, syslogd and klogd, can only be started
* once. They check the pidfile.
*
* Sun Aug 13 19:01:41 MET DST 1995: Martin Schulze
* Add an addition to syslog.conf's interpretation. If a priority
* begins with an exclamation mark ('!') the normal interpretation
* of the priority is inverted: ".!*" is the same as ".none", ".!=info"
* don't logs the info priority, ".!crit" won't log any message with
* the priority crit or higher. For example:
*
* mail.*;mail.!=info /usr/adm/mail
*
* Would log all messages of the facility mail except those with
* the priority info to /usr/adm/mail. This makes the syslogd
* much more flexible.
*
* Defined TABLE_ALLPRI=255 and changed some occurrences.
*
* Sat Aug 19 21:40:13 MET DST 1995: Martin Schulze
* Making the table of facilities and priorities while in debug
* mode more readable.
*
* If debugging is turned on, printing the whole table of
* facilities and priorities every hexadecimal or 'X' entry is
* now 2 characters wide.
*
* The number of the entry is prepended to each line of
* facilities and priorities, and F_UNUSED lines are not shown
* anymore.
*
* Corrected some #ifdef SYSV's.
*
* Mon Aug 21 22:10:35 MET DST 1995: Martin Schulze
* Corrected a strange behavior during parsing of configuration
* file. The original BSD syslogd doesn't understand spaces as
* separators between specifier and action. This syslogd now
* understands them. The old behavior caused some confusion over
* the Linux community.
*
* Thu Oct 19 00:02:07 MET 1995: Martin Schulze
* The default behavior has changed for security reasons. The
* syslogd will not receive any remote message unless you turn
* reception on with the "-r" option.
*
* Not defining SYSLOG_INET will result in not doing any network
* activity, i.e. not sending or receiving messages. I changed
* this because the old idea is implemented with the "-r" option
* and the old thing didn't work anyway.
*
* Thu Oct 26 13:14:06 MET 1995: Martin Schulze
* Added another logfile type F_FORW_UNKN. The problem I ran into
* was a name server that runs on my machine and a forwarder of
* kern.crit to another host. The hosts address can only be
* fetched using the nameserver. But named is started after
* syslogd, so syslogd complained.
*
* This logfile type will retry to get the address of the
* hostname ten times and then complain. This should be enough to
* get the named up and running during boot sequence.
*
* Fri Oct 27 14:08:15 1995: Dr. Wettstein
* Changed static array of logfiles to a dynamic array. This
* can grow during process.
*
* Fri Nov 10 23:08:18 1995: Martin Schulze
* Inserted a new tabular sys_h_errlist that contains plain text
* for error codes that are returned from the net subsystem and
* stored in h_errno. I have also changed some wrong lookups to
* sys_errlist.
*
* Wed Nov 22 22:32:55 1995: Martin Schulze
* Added the fabulous strip-domain feature that allows us to
* strip off (several) domain names from the fqdn and only log
* the simple hostname. This is useful if you're in a LAN that
* has a central log server and also different domains.
*
* I have also also added the -l switch do define hosts as
* local. These will get logged with their simple hostname, too.
*
* Thu Nov 23 19:02:56 MET DST 1995: Martin Schulze
* Added the possibility to omit fsyncing of logfiles after every
* write. This will give some performance back if you have
* programs that log in a very verbose manner (like innd or
* smartlist). Thanks to Stephen R. van den Berg <srb@cuci.nl>
* for the idea.
*
* Thu Jan 18 11:14:36 CST 1996: Dr. Wettstein
* Added patche from beta-testers to stop compile error. Also
* added removal of pid file as part of termination cleanup.
*
* Wed Feb 14 12:42:09 CST 1996: Dr. Wettstein
* Allowed forwarding of messages received from remote hosts to
* be controlled by a command-line switch. Specifying -h allows
* forwarding. The default behavior is to disable forwarding of
* messages which were received from a remote host.
*
* Parent process of syslogd does not exit until child process has
* finished initialization process. This allows rc.* startup to
* pause until syslogd facility is up and operating.
*
* Re-arranged the select code to move UNIX domain socket accepts
* to be processed later. This was a contributed change which
* has been proposed to correct the delays sometimes encountered
* when syslogd starts up.
*
* Minor code cleanups.
*
* Thu May 2 15:15:33 CDT 1996: Dr. Wettstein
* Fixed bug in init function which resulted in file descripters
* being orphaned when syslogd process was re-initialized with SIGHUP
* signal. Thanks to Edvard Tuinder
* (Edvard.Tuinder@praseodymium.cistron.nl) for putting me on the
* trail of this bug. I am amazed that we didn't catch this one
* before now.
*
* Tue May 14 00:03:35 MET DST 1996: Martin Schulze
* Corrected a mistake that causes the syslogd to stop logging at
* some virtual consoles under Linux. This was caused by checking
* the wrong error code. Thanks to Michael Nonweiler
* <mrn20@hermes.cam.ac.uk> for sending me a patch.
*
* Mon May 20 13:29:32 MET DST 1996: Miquel van Smoorenburg <miquels@cistron.nl>
* Added continuation line supported and fixed a bug in
* the init() code.
*
* Tue May 28 00:58:45 MET DST 1996: Martin Schulze
* Corrected behaviour of blocking pipes - i.e. the whole system
* hung. Michael Nonweiler <mrn20@hermes.cam.ac.uk> has sent us
* a patch to correct this. A new logfile type F_PIPE has been
* introduced.
*
* Mon Feb 3 10:12:15 MET DST 1997: Martin Schulze
* Corrected behaviour of logfiles if the file can't be opened.
* There was a bug that causes syslogd to try to log into non
* existing files which ate cpu power.
*
* Sun Feb 9 03:22:12 MET DST 1997: Martin Schulze
* Modified syslogd.c to not kill itself which confuses bash 2.0.
*
* Mon Feb 10 00:09:11 MET DST 1997: Martin Schulze
* Improved debug code to decode the numeric facility/priority
* pair into textual information.
*
* Tue Jun 10 12:35:10 MET DST 1997: Martin Schulze
* Corrected freeing of logfiles. Thanks to Jos Vos <jos@xos.nl>
* for reporting the bug and sending an idea to fix the problem.
*
* Tue Jun 10 12:51:41 MET DST 1997: Martin Schulze
* Removed sleep(10) from parent process. This has caused a slow
* startup in former times - and I don't see any reason for this.
*
* Sun Jun 15 16:23:29 MET DST 1997: Michael Alan Dorman
* Some more glibc patches made by <mdorman@debian.org>.
*
* Thu Jan 1 16:04:52 CET 1998: Martin Schulze <joey@infodrom.north.de
* Applied patch from Herbert Thielen <Herbert.Thielen@lpr.e-technik.tu-muenchen.de>.
* This included some balance parentheses for emacs and a bug in
* the exclamation mark handling.
*
* Fixed small bug which caused syslogd to write messages to the
* wrong logfile under some very rare conditions. Thanks to
* Herbert Xu <herbert@gondor.apana.org.au> for fiddling this out.
*
* Thu Jan 8 22:46:35 CET 1998: Martin Schulze <joey@infodrom.north.de>
* Reworked one line of the above patch as it prevented syslogd
* from binding the socket with the result that no messages were
* forwarded to other hosts.
*
* Sat Jan 10 01:33:06 CET 1998: Martin Schulze <joey@infodrom.north.de>
* Fixed small bugs in F_FORW_UNKN meachanism. Thanks to Torsten
* Neumann <torsten@londo.rhein-main.de> for pointing me to it.
*
* Mon Jan 12 19:50:58 CET 1998: Martin Schulze <joey@infodrom.north.de>
* Modified debug output concerning remote receiption.
*/
#define MAXLINE 1024 /* maximum line length */
#define MAXSVLINE 240 /* maximum saved line length */
#define DEFUPRI (LOG_USER|LOG_NOTICE)
#define DEFSPRI (LOG_KERN|LOG_CRIT)
#define TIMERINTVL 30 /* interval for checking flush, mark */
#define CONT_LINE 1 /* Allow continuation lines */
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#ifdef SYSV
#include <sys/types.h>
#endif
#include <utmp.h>
#include <ctype.h>
#include <string.h>
#include <setjmp.h>
#include <stdarg.h>
#define SYSLOG_NAMES
#include <sys/syslog.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/file.h>
#ifdef SYSV
#include <fcntl.h>
#else
#include <sys/msgbuf.h>
#endif
#include <sys/uio.h>
#include <sys/un.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <signal.h>
#include <netinet/in.h>
#include <netdb.h>
#include <syscall.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
#include <resolv.h>
#include "pidfile.h"
#include "version.h"
#if defined(__linux__)
#include <paths.h>
#endif
#ifndef UTMP_FILE
#ifdef UTMP_FILENAME
#define UTMP_FILE UTMP_FILENAME
#else
#ifdef _PATH_UTMP
#define UTMP_FILE _PATH_UTMP
#else
#define UTMP_FILE "/etc/utmp"
#endif
#endif
#endif
#ifndef _PATH_LOGCONF
#define _PATH_LOGCONF "/etc/syslog.conf"
#endif
#if defined(SYSLOGD_PIDNAME)
#undef _PATH_LOGPID
#if defined(FSSTND)
#define _PATH_LOGPID _PATH_VARRUN SYSLOGD_PIDNAME
#else
#define _PATH_LOGPID "/etc/" SYSLOGD_PIDNAME
#endif
#else
#ifndef _PATH_LOGPID
#if defined(FSSTND)
#define _PATH_LOGPID _PATH_VARRUN "syslogd.pid"
#else
#define _PATH_LOGPID "/etc/syslogd.pid"
#endif
#endif
#endif
#ifndef _PATH_DEV
#define _PATH_DEV "/dev/"
#endif
#ifndef _PATH_CONSOLE
#define _PATH_CONSOLE "/dev/console"
#endif
#ifndef _PATH_TTY
#define _PATH_TTY "/dev/tty"
#endif
#ifndef _PATH_LOG
#define _PATH_LOG "/dev/log"
#endif
char *LogName = _PATH_LOG;
char *ConfFile = _PATH_LOGCONF;
char *PidFile = _PATH_LOGPID;
char ctty[] = _PATH_CONSOLE;
char **parts;
int inetm = 0, funix = 0;
static int debugging_on = 0;
static int nlogs = -1;
static int restart = 0;
#define UNAMESZ 8 /* length of a login name */
#define MAXUNAMES 20 /* maximum number of user names */
#define MAXFNAME 200 /* max file pathname length */
#define INTERNAL_NOPRI 0x10 /* the "no priority" priority */
#define TABLE_NOPRI 0 /* Value to indicate no priority in f_pmask */
#define TABLE_ALLPRI 0xFF /* Value to indicate all priorities in f_pmask */
#define LOG_MARK LOG_MAKEPRI(LOG_NFACILITIES, 0) /* mark "facility" */
/*
* Flags to logmsg().
*/
#define IGN_CONS 0x001 /* don't print on console */
#define SYNC_FILE 0x002 /* do fsync on file after printing */
#define ADDDATE 0x004 /* add a date to the message */
#define MARK 0x008 /* this message is a mark */
/*
* This table contains plain text for h_errno errors used by the
* net subsystem.
*/
const char *sys_h_errlist[] = {
"No problem", /* NETDB_SUCCESS */
"Authoritative answer: host not found", /* HOST_NOT_FOUND */
"Non-authoritative answer: host not found, or serverfail", /* TRY_AGAIN */
"Non recoverable errors", /* NO_RECOVERY */
"Valid name, no data record of requested type", /* NO_DATA */
"no address, look for MX record" /* NO_ADDRESS */
};
/*
* This structure represents the files that will have log
* copies printed.
*/
struct filed {
#ifndef SYSV
struct filed *f_next; /* next in linked list */
#endif
short f_type; /* entry type, see below */
short f_file; /* file descriptor */
time_t f_time; /* time this was last written */
u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */
union {
char f_uname[MAXUNAMES][UNAMESZ+1];
struct {
char f_hname[MAXHOSTNAMELEN+1];
struct sockaddr_in f_addr;
} f_forw; /* forwarding address */
char f_fname[MAXFNAME];
} f_un;
char f_prevline[MAXSVLINE]; /* last message logged */
char f_lasttime[16]; /* time of last occurrence */
char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */
int f_prevpri; /* pri of f_prevline */
int f_prevlen; /* length of f_prevline */
int f_prevcount; /* repetition cnt of prevline */
int f_repeatcount; /* number of "repeated" msgs */
int f_flags; /* store some additional flags */
};
/*
* Intervals at which we flush out "message repeated" messages,
* in seconds after previous message is logged. After each flush,
* we move to the next interval until we reach the largest.
*/
int repeatinterval[] = { 30, 60 }; /* # of secs before flush */
#define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount])
#define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \
(f)->f_repeatcount = MAXREPEAT; \
}
#ifdef SYSLOG_INET
#define INET_SUSPEND_TIME 180 /* equal to 3 minutes */
#define INET_RETRY_MAX 10 /* maximum of retries for gethostbyname() */
#endif
#define LIST_DELIMITER ':' /* delimiter between two hosts */
/* values for f_type */
#define F_UNUSED 0 /* unused entry */
#define F_FILE 1 /* regular file */
#define F_TTY 2 /* terminal */
#define F_CONSOLE 3 /* console terminal */
#define F_FORW 4 /* remote machine */
#define F_USERS 5 /* list of users */
#define F_WALL 6 /* everyone logged on */
#define F_FORW_SUSP 7 /* suspended host forwarding */
#define F_FORW_UNKN 8 /* unknown host forwarding */
#define F_PIPE 9 /* named pipe */
char *TypeNames[] = {
"UNUSED", "FILE", "TTY", "CONSOLE",
"FORW", "USERS", "WALL", "FORW(SUSPENDED)",
"FORW(UNKNOWN)", "PIPE"
};
struct filed *Files = (struct filed *) 0;
struct filed consfile;
struct code {
char *c_name;
int c_val;
};
struct code PriNames[] = {
{"alert", LOG_ALERT},
{"crit", LOG_CRIT},
{"debug", LOG_DEBUG},
{"emerg", LOG_EMERG},
{"err", LOG_ERR},
{"error", LOG_ERR}, /* DEPRECATED */
{"info", LOG_INFO},
{"none", INTERNAL_NOPRI}, /* INTERNAL */
{"notice", LOG_NOTICE},
{"panic", LOG_EMERG}, /* DEPRECATED */
{"warn", LOG_WARNING}, /* DEPRECATED */
{"warning", LOG_WARNING},
{"*", TABLE_ALLPRI},
{NULL, -1}
};
struct code FacNames[] = {
{"auth", LOG_AUTH},
{"authpriv", LOG_AUTHPRIV},
{"cron", LOG_CRON},
{"daemon", LOG_DAEMON},
{"kern", LOG_KERN},
{"lpr", LOG_LPR},
{"mail", LOG_MAIL},
{"mark", LOG_MARK}, /* INTERNAL */
{"news", LOG_NEWS},
{"security", LOG_AUTH}, /* DEPRECATED */
{"syslog", LOG_SYSLOG},
{"user", LOG_USER},
{"uucp", LOG_UUCP},
{"local0", LOG_LOCAL0},
{"local1", LOG_LOCAL1},
{"local2", LOG_LOCAL2},
{"local3", LOG_LOCAL3},
{"local4", LOG_LOCAL4},
{"local5", LOG_LOCAL5},
{"local6", LOG_LOCAL6},
{"local7", LOG_LOCAL7},
{NULL, -1},
};
int Debug; /* debug flag */
char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */
char *LocalDomain; /* our local domain name */
int InetInuse = 0; /* non-zero if INET sockets are being used */
int finet; /* Internet datagram socket */
int LogPort; /* port number for INET connections */
int Initialized = 0; /* set when we have initialized ourselves */
int MarkInterval = 20 * 60; /* interval between marks in seconds */
int MarkSeq = 0; /* mark sequence number */
int NoFork = 0; /* don't fork - don't run in daemon mode */
int AcceptRemote = 0; /* receive messages that come via UDP */
char **StripDomains = NULL; /* these domains may be stripped before writing logs */
char **LocalHosts = NULL; /* these hosts are logged with their hostname */
int NoHops = 1; /* Can we bounce syslog messages through an
intermediate host. */
extern int errno, sys_nerr;
#if !defined(__GLIBC__)
extern char *sys_errlist[];
#endif /* __GLIBC__ */
extern char *ctime(), *index();
/* Function prototypes. */
int main(int argc, char **argv);
char **crunch_list(char *list);
int usage(void);
void untty(void);
void printchopped(const char *hname, char *msg, int len, int fd);
void printline(const char *hname, char *msg);
void printsys(char *msg);
void logmsg(int pri, char *msg, const char *from, int flags);
void fprintlog(register struct filed *f, char *from, int flags, char *msg);
void endtty();
void wallmsg(register struct filed *f, struct iovec *iov);
void reapchild();
const char *cvthname(struct sockaddr_in *f);
void domark();
void debug_switch();
void logerror(char *type);
void die(int sig);
void init();
void cfline(char *line, register struct filed *f);
int decode(char *name, struct code *codetab);
#if defined(__GLIBC__)
#define dprintf mydprintf
#endif /* __GLIBC__ */
static void dprintf(char *, ...);
static void allocate_log(void);
void sighup_handler();
int main(argc, argv)
int argc;
char **argv;
{
register int i;
register char *p;
#if !defined(__GLIBC__)
int len, num_fds;
#else /* __GLIBC__ */
size_t len;
int num_fds;
#endif /* __GLIBC__ */
fd_set unixm, readfds;
int fd;
#ifdef SYSLOG_UNIXAF
struct sockaddr_un sunx, fromunix;
#endif
#ifdef SYSLOG_INET
struct sockaddr_in sin, frominet;
char *from;
#endif
int ch;
struct hostent *hent;
char line[MAXLINE +1];
extern int optind;
extern char *optarg;
chdir ("/");
while ((ch = getopt(argc, argv, "dhf:l:m:np:rs:v")) != EOF)
switch((char)ch) {
case 'd': /* debug */
Debug = 1;
break;
case 'f': /* configuration file */
ConfFile = optarg;
break;
case 'h':
NoHops = 0;
break;
case 'l':
if (LocalHosts) {
printf ("Only one -l argument allowed," \
"the first one is taken.\n");
break;
}
LocalHosts = crunch_list(optarg);
break;
case 'm': /* mark interval */
MarkInterval = atoi(optarg) * 60;
break;
case 'n': /* don't fork */
NoFork = 1;
break;
case 'p': /* path */
LogName = optarg;
break;
case 'r': /* accept remote messages */
AcceptRemote = 1;
break;
case 's':
if (StripDomains) {
printf ("Only one -s argument allowed," \
"the first one is taken.\n");
break;
}
StripDomains = crunch_list(optarg);
break;
case 'v':
printf("syslogd %s-%s\n", VERSION, PATCHLEVEL);
exit (0);
case '?':
default:
usage();
}
if (argc -= optind)
usage();
if ( !(Debug || NoFork) )
{
dprintf("Checking pidfile.\n");
if (!check_pid(PidFile))
{
if (fork())
/*
* Parent process
*/
exit(0);
num_fds = getdtablesize();
for (i= 0; i < num_fds; i++)
(void) close(i);
untty();
}
else
{
fputs("syslogd: Already running.\n", stderr);
exit(1);
}
}
else
debugging_on = 1;
#ifndef SYSV
else
setlinebuf(stdout);
#endif
/* tuck my process id away */
if ( !Debug )
{
dprintf("Writing pidfile.\n");
if (!check_pid(PidFile))
{
if (!write_pid(PidFile))
{
dprintf("Can't write pid.\n");
exit(1);
}
}
else
{
dprintf("Pidfile (and pid) already exist.\n");
exit(1);
}
} /* if ( !Debug ) */
consfile.f_type = F_CONSOLE;
(void) strcpy(consfile.f_un.f_fname, ctty);
(void) gethostname(LocalHostName, sizeof(LocalHostName));
if ( (p = index(LocalHostName, '.')) ) {
*p++ = '\0';
LocalDomain = p;
}
else
{
LocalDomain = "";
/*
* It's not clearly defined whether gethostname()
* should return the simple hostname or the fqdn. A
* good piece of software should be aware of both and
* we want to distribute good software. Joey
*
* Good software also always checks its return values...
* If syslogd starts up before DNS is up & /etc/hosts
* doesn't have LocalHostName listed, gethostbyname will
* return NULL.
*/
hent = gethostbyname(LocalHostName);
if ( hent )
sprintf(LocalHostName, "%s", hent->h_name);
if ( (p = index(LocalHostName, '.')) )
{
*p++ = '\0';
LocalDomain = p;
}
}
/*
* Convert to lower case to recognize the correct domain laterly
*/
for (p = (char *)LocalDomain; *p ; p++)
if (isupper(*p))
*p = tolower(*p);
(void) signal(SIGTERM, die);
(void) signal(SIGINT, Debug ? die : SIG_IGN);
(void) signal(SIGQUIT, Debug ? die : SIG_IGN);
(void) signal(SIGCHLD, reapchild);
(void) signal(SIGALRM, domark);
(void) signal(SIGUSR1, Debug ? debug_switch : SIG_IGN);
(void) alarm(TIMERINTVL);
(void) unlink(LogName);
#ifdef SYSLOG_UNIXAF
sunx.sun_family = AF_UNIX;
(void) strncpy(sunx.sun_path, LogName, sizeof(sunx.sun_path));
funix = socket(AF_UNIX, SOCK_STREAM, 0);
if (funix < 0 || bind(funix, (struct sockaddr *) &sunx,
sizeof(sunx.sun_family)+strlen(sunx.sun_path)) < 0 ||
chmod(LogName, 0666) < 0 || listen(funix, 5) < 0) {
(void) sprintf(line, "cannot create %s", LogName);
logerror(line);
dprintf("cannot create %s (%d).\n", LogName, errno);
#ifndef SYSV
die(0);
#endif
}
#endif
#ifdef SYSLOG_INET
finet = socket(AF_INET, SOCK_DGRAM, 0);
if (finet >= 0) {
auto int on = 1;
struct servent *sp;
sp = getservbyname("syslog", "udp");
if (sp == NULL) {
errno = 0;
logerror("network logging disabled (syslog/udp service unknown).");
logerror("see syslogd(8) for details of whether and how to enable it.");
}
else {
sin.sin_family = AF_INET;
sin.sin_port = LogPort = sp->s_port;
sin.sin_addr.s_addr = 0;
if ( setsockopt(finet, SOL_SOCKET, SO_REUSEADDR, \
(char *) &on, sizeof(on)) < 0 ) {
logerror("setsockopt, suspending inet");
}
else {
if (bind(finet, (struct sockaddr *) &sin, \
sizeof(sin)) < 0) {
logerror("bind, suspending inet");
} else {
inetm = finet;
InetInuse = 1;
if ( AcceptRemote )
dprintf("Opened syslog UDP port.\n");
}
}
}
}
else
logerror("syslog: Unknown protocol, suspending inet service.");
#endif
/* Create a partial message table for all file descriptors. */
num_fds = getdtablesize();
dprintf("Allocated parts table for %d file descriptors.\n", num_fds);
if ( (parts = (char **) malloc(num_fds * sizeof(char *))) == \
(char **) 0 )
{
logerror("Cannot allocate memory for message parts table.");
die(0);
}
for(i= 0; i < num_fds; ++i)
parts[i] = (char *) 0;
dprintf("Starting.\n");
init();
if ( Debug )
{
dprintf("Debugging disabled, SIGUSR1 to turn on debugging.\n");
debugging_on = 0;
}
/* Main loop begins here. */
FD_ZERO(&unixm);
FD_ZERO(&readfds);
for (;;) {
int nfds;
errno = 0;
#ifdef SYSLOG_UNIXAF
/*
* Add the Unix Domain Socket to the list of read
* descriptors.
*/
FD_SET(funix, &readfds);
for (nfds= 0; nfds < FD_SETSIZE; ++nfds)
if ( FD_ISSET(nfds, &unixm) )
FD_SET(nfds, &readfds);
#endif
#ifdef SYSLOG_INET
/*
* Add the Internet Domain Socket to the list of read
* descriptors.
*/
if ( InetInuse && AcceptRemote ) {
FD_SET(inetm, &readfds);
dprintf("Listening on syslog UDP port.\n");
}
#endif
if ( debugging_on )
{
dprintf("Calling select, active file descriptors: ");
for (nfds= 0; nfds < FD_SETSIZE; ++nfds)
if ( FD_ISSET(nfds, &readfds) )
dprintf("%d ", nfds);
dprintf("\n");
}
nfds = select(FD_SETSIZE, (fd_set *) &readfds, (fd_set *) NULL,
(fd_set *) NULL, (struct timeval *) NULL);
if ( restart )
{
dprintf("\nReceived SIGHUP, reloading syslogd.\n");
init();
restart = 0;
continue;
}
if (nfds == 0) {
dprintf("No select activity.\n");
continue;
}
if (nfds < 0) {
if (errno != EINTR)
logerror("select");
dprintf("Select interrupted.\n");
continue;
}
if ( debugging_on )
{
dprintf("\nSuccessful select, descriptor count = %d, " \
"Activity on: ", nfds);
for (nfds= 0; nfds < FD_SETSIZE; ++nfds)
if ( FD_ISSET(nfds, &readfds) )
dprintf("%d ", nfds);
dprintf(("\n"));
}
#ifdef SYSLOG_UNIXAF
if ( debugging_on )
{
dprintf("Checking UNIX connections, active: ");
for (nfds= 0; nfds < FD_SETSIZE; ++nfds)
if ( FD_ISSET(nfds, &unixm) )
dprintf("%d ", nfds);
dprintf("\n");
}
for (fd= 0; fd < FD_SETSIZE; ++fd)
if ( FD_ISSET(fd, &readfds) && FD_ISSET(fd, &unixm) ) {
dprintf("Message from UNIX socket #%d.\n", fd);
memset(line, '\0', sizeof(line));
i = read(fd, line, MAXLINE);
if (i > 0) {
printchopped(LocalHostName, line, i, fd);
} else if (i < 0) {
if (errno != EINTR) {
logerror("recvfrom unix");
}
} else {
dprintf("Unix socket (%d) closed.\n", fd);
if ( parts[fd] != (char *) 0 )
{
logerror("Printing partial message");
line[0] = '\0';
printchopped(LocalHostName, line, \
strlen(parts[fd]) + 1, \
fd);
}
close(fd);
FD_CLR(fd, &unixm);
FD_CLR(fd, &readfds);
}
}
/* Accept a new unix connection */
if (FD_ISSET(funix, &readfds)) {
len = sizeof(fromunix);
if ((fd = accept(funix, (struct sockaddr *) &fromunix,\
&len)) >= 0) {
FD_SET(fd, &unixm);
dprintf("New UNIX connect assigned to fd: " \
"%d.\n", fd);
FD_SET(fd, &readfds);
}
else {
dprintf("Error accepting UNIX connection: " \
"%d = %s.\n", errno, strerror(errno));
}
}
#endif
#ifdef SYSLOG_INET
if (InetInuse && AcceptRemote && FD_ISSET(inetm, &readfds)) {
len = sizeof(frominet);
memset(line, '\0', sizeof(line));
i = recvfrom(finet, line, MAXLINE - 2, 0, \
(struct sockaddr *) &frominet, &len);
dprintf("Message from inetd socket: #%d, host: %s\n",
inetm, inet_ntoa(frominet.sin_addr));
if (i > 0) {
line[i] = line[i+1] = '\0';
from = (char *)cvthname(&frominet);
/*
* Here we could check if the host is permitted
* to send us syslog messages. We just have to
* catch the result of cvthname, look for a dot
* and if that doesn't exist, replace the first
* '\0' with '.' and we have the fqdn in lowercase
* letters so we could match them against whatever.
* -Joey
*/
printchopped(from, line, \
i + 2, finet);
} else if (i < 0 && errno != EINTR) {
dprintf("INET socket error: %d = %s.\n", \
errno, strerror(errno));
logerror("recvfrom inet");
sleep(10);
}
}
#endif
}
}
int usage()
{
fprintf(stderr, "usage: syslogd [-drvh] [-l hostlist] [-m markinterval] [-n] [-p path]\n" \
" [-s domainlist] [-f conffile]\n");
exit(1);
}
char **
crunch_list(list)
char *list;
{
int count, i;
char *p, *q;
char **result = NULL;
p = list;
/* strip off trailing delimiters */
while (p[strlen(p)-1] == LIST_DELIMITER) {
count--;
p[strlen(p)-1] = '\0';
}
/* cut off leading delimiters */
while (p[0] == LIST_DELIMITER) {
count--;
p++;
}
/* count delimiters to calculate elements */
for (count=i=0; p[i]; i++)
if (p[i] == LIST_DELIMITER) count++;
if ((result = (char **)malloc(sizeof(char *) * count+2)) == NULL) {
printf ("Sorry, can't get enough memory, exiting.\n");
exit(0);
}
/*
* We now can assume that the first and last
* characters are different from any delimiters,
* so we don't have to care about this.
*/
count = 0;
while ((q=index(p, LIST_DELIMITER))) {
result[count] = (char *) malloc((q - p + 1) * sizeof(char));
if (result[count] == NULL) {
printf ("Sorry, can't get enough memory, exiting.\n");
exit(0);
}
strncpy(result[count], p, q - p);
result[count][q - p] = '\0';
p = q; p++;
count++;
}
if ((result[count] = \
(char *)malloc(sizeof(char) * strlen(p) + 1)) == NULL) {
printf ("Sorry, can't get enough memory, exiting.\n");
exit(0);
}
strcpy(result[count],p);
result[++count] = NULL;
#if 0
count=0;
while (result[count])
dprintf ("#%d: %s\n", count, StripDomains[count++]);
#endif
return result;
}
void untty()
#ifdef SYSV
{
if ( !Debug ) {
setsid();
}
return;
}
#else
{
int i;
if ( !Debug ) {
i = open(_PATH_TTY, O_RDWR);
if (i >= 0) {
(void) ioctl(i, (int) TIOCNOTTY, (char *)0);
(void) close(i);
}
}
}
#endif
/*
* Parse the line to make sure that the msg is not a composite of more
* than one message.
*/
void printchopped(hname, msg, len, fd)
const char *hname;
char *msg;
int len;
int fd;
{
auto int ptlngth;
auto char *start = msg,
*p,
*end,
tmpline[MAXLINE + 1];
dprintf("Message length: %d, File descriptor: %d.\n", len, fd);
tmpline[0] = '\0';
if ( parts[fd] != (char *) 0 )
{
dprintf("Including part from messages.\n");
strcpy(tmpline, parts[fd]);
free(parts[fd]);
parts[fd] = (char *) 0;
if ( (strlen(msg) + strlen(tmpline)) > MAXLINE )
{
logerror("Cannot glue message parts together");
printline(hname, tmpline);
start = msg;
}
else
{
dprintf("Previous: %s\n", tmpline);
dprintf("Next: %s\n", msg);
strcat(tmpline, msg);
printline(hname, tmpline);
if ( (strlen(msg) + 1) == len )
return;
else
start = strchr(msg, '\0') + 1;
}
}
if ( msg[len-1] != '\0' )
{
msg[len] = '\0';
for(p= msg+len-1; *p != '\0' && p > msg; )
--p;
ptlngth = strlen(++p);
if ( (parts[fd] = malloc(ptlngth + 1)) == (char *) 0 )
logerror("Cannot allocate memory for message part.");
else
{
strcpy(parts[fd], p);
dprintf("Saving partial msg: %s\n", parts[fd]);
memset(p, '\0', ptlngth);
}
}
do {
end = strchr(start + 1, '\0');
printline(hname, start);
start = end + 1;
} while ( *start != '\0' );
return;
}
/*
* Take a raw input line, decode the message, and print the message
* on the appropriate log files.
*/
void printline(hname, msg)
const char *hname;
char *msg;
{
register char *p, *q;
register int c;
char line[MAXLINE + 1];
int pri;
/* test for special codes */
pri = DEFUPRI;
p = msg;
if (*p == '<') {
pri = 0;
while (isdigit(*++p))
{
pri = 10 * pri + (*p - '0');
}
if (*p == '>')
++p;
}
if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
pri = DEFUPRI;
q = line;
while ((c = *p++ & 0177) != '\0' &&
q < &line[sizeof(line) - 1])
if (c == '\n')
*q++ = ' ';
else if (iscntrl(c)) {
*q++ = '^';
*q++ = c ^ 0100;
} else
*q++ = c;
*q = '\0';
logmsg(pri, line, hname, SYNC_FILE);
return;
}
/*
* Take a raw input line from /dev/klog, split and format similar to syslog().
*/
void printsys(msg)
char *msg;
{
register char *p, *q;
register int c;
char line[MAXLINE + 1];
int pri, flags;
char *lp;
(void) sprintf(line, "vmunix: ");
lp = line + strlen(line);
for (p = msg; *p != '\0'; ) {
flags = ADDDATE;
pri = DEFSPRI;
if (*p == '<') {
pri = 0;
while (isdigit(*++p))
pri = 10 * pri + (*p - '0');
if (*p == '>')
++p;
} else {
/* kernel printf's come out on console */
flags |= IGN_CONS;
}
if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
pri = DEFSPRI;
q = lp;
while (*p != '\0' && (c = *p++) != '\n' &&
q < &line[MAXLINE])
*q++ = c;
*q = '\0';
logmsg(pri, line, LocalHostName, flags);
}
return;
}
/*
* Decode a priority into textual information like auth.emerg.
*/
char *textpri(pri)
int pri;
{
static char res[20];
CODE *c_pri, *c_fac;
for (c_fac = facilitynames; c_fac->c_name && !(c_fac->c_val == LOG_FAC(pri)<<3); c_fac++);
for (c_pri = prioritynames; c_pri->c_name && !(c_pri->c_val == LOG_PRI(pri)); c_pri++);
/* sprintf (res, "%d.%d", LOG_FAC(pri), LOG_PRI(pri));*/
sprintf (res, "%s.%s<%d>", c_fac->c_name, c_pri->c_name, pri);
return res;
}
time_t now;
/*
* Log a message to the appropriate log files, users, etc. based on
* the priority.
*/
void logmsg(pri, msg, from, flags)
int pri;
char *msg;
const char *from;
int flags;
{
register struct filed *f;
int fac, prilev, lognum;
int msglen;
char *timestamp;
dprintf("logmsg: %s, flags %x, from %s, msg %s\n", textpri(pri), flags, from, msg);
#ifndef SYSV
omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
#endif
/*
* Check to see if msg looks non-standard.
*/
msglen = strlen(msg);
if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
flags |= ADDDATE;
(void) time(&now);
if (flags & ADDDATE)
timestamp = ctime(&now) + 4;
else {
timestamp = msg;
msg += 16;
msglen -= 16;
}
/* extract facility and priority level */
if (flags & MARK)
fac = LOG_NFACILITIES;
else
fac = LOG_FAC(pri);
prilev = LOG_PRI(pri);
/* log the message to the particular outputs */
if (!Initialized) {
f = &consfile;
f->f_file = open(ctty, O_WRONLY|O_NOCTTY);
if (f->f_file >= 0) {
untty();
fprintlog(f, (char *)from, flags, msg);
(void) close(f->f_file);
}
#ifndef SYSV
(void) sigsetmask(omask);
#endif
return;
}
#ifdef SYSV
for (lognum = 0; lognum <= nlogs; lognum++) {
f = &Files[lognum];
#else
for (f = Files; f; f = f->f_next) {
#endif
/* skip messages that are incorrect priority */
if ( (f->f_pmask[fac] == TABLE_NOPRI) || \
((f->f_pmask[fac] & (1<<prilev)) == 0) )
continue;
if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
continue;
/* don't output marks to recently written files */
if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
continue;
/*
* suppress duplicate lines to this file
*/
if ((flags & MARK) == 0 && msglen == f->f_prevlen &&
!strcmp(msg, f->f_prevline) &&
!strcmp(from, f->f_prevhost)) {
(void) strncpy(f->f_lasttime, timestamp, 15);
f->f_prevcount++;
dprintf("msg repeated %d times, %ld sec of %d.\n",
f->f_prevcount, now - f->f_time,
repeatinterval[f->f_repeatcount]);
/*
* If domark would have logged this by now,
* flush it now (so we don't hold isolated messages),
* but back off so we'll flush less often
* in the future.
*/
if (now > REPEATTIME(f)) {
fprintlog(f, (char *)from, flags, (char *)NULL);
BACKOFF(f);
}
} else {
/* new line, save it */
if (f->f_prevcount)
fprintlog(f, (char *)from, 0, (char *)NULL);
f->f_prevpri = pri;
f->f_repeatcount = 0;
(void) strncpy(f->f_lasttime, timestamp, 15);
(void) strncpy(f->f_prevhost, from,
sizeof(f->f_prevhost));
if (msglen < MAXSVLINE) {
f->f_prevlen = msglen;
(void) strcpy(f->f_prevline, msg);
fprintlog(f, (char *)from, flags, (char *)NULL);
} else {
f->f_prevline[0] = 0;
f->f_prevlen = 0;
fprintlog(f, (char *)from, flags, msg);
}
}
}
#ifndef SYSV
(void) sigsetmask(omask);
#endif
}
#if FALSE
} /* balance parentheses for emacs */
#endif
void fprintlog(f, from, flags, msg)
register struct filed *f;
char *from;
int flags;
char *msg;
{
struct iovec iov[6];
register struct iovec *v = iov;
register int l;
char line[MAXLINE + 1];
char repbuf[80];
time_t fwd_suspend;
struct hostent *hp;
dprintf("Called fprintlog, ");
v->iov_base = f->f_lasttime;
v->iov_len = 15;
v++;
v->iov_base = " ";
v->iov_len = 1;
v++;
v->iov_base = f->f_prevhost;
v->iov_len = strlen(v->iov_base);
v++;
v->iov_base = " ";
v->iov_len = 1;
v++;
if (msg) {
v->iov_base = msg;
v->iov_len = strlen(msg);
} else if (f->f_prevcount > 1) {
(void) sprintf(repbuf, "last message repeated %d times",
f->f_prevcount);
v->iov_base = repbuf;
v->iov_len = strlen(repbuf);
} else {
v->iov_base = f->f_prevline;
v->iov_len = f->f_prevlen;
}
v++;
dprintf("logging to %s", TypeNames[f->f_type]);
switch (f->f_type) {
case F_UNUSED:
f->f_time = now;
dprintf("\n");
break;
case F_FORW_SUSP:
fwd_suspend = time((time_t *) 0) - f->f_time;
if ( fwd_suspend >= INET_SUSPEND_TIME ) {
dprintf("\nForwarding suspension over, " \
"retrying FORW ");
f->f_type = F_FORW;
goto f_forw;
}
else {
dprintf(" %s\n", f->f_un.f_forw.f_hname);
dprintf("Forwarding suspension not over, time " \
"left: %d.\n", INET_SUSPEND_TIME - \
fwd_suspend);
}
break;
/*
* The trick is to wait some time, then retry to get the
* address. If that fails retry x times and then give up.
*
* You'll run into this problem mostly if the name server you
* need for resolving the address is on the same machine, but
* is started after syslogd.
*/
case F_FORW_UNKN:
dprintf(" %s\n", f->f_un.f_forw.f_hname);
fwd_suspend = time((time_t *) 0) - f->f_time;
if ( fwd_suspend >= INET_SUSPEND_TIME ) {
dprintf("Forwarding suspension to unknown over, retrying\n");
if ( (hp = gethostbyname(f->f_un.f_forw.f_hname)) == NULL ) {
dprintf("Failure: %s\n", sys_h_errlist[h_errno]);
dprintf("Retries: %d\n", f->f_prevcount);
if ( --f->f_prevcount < 0 ) {
dprintf("Giving up.\n");
f->f_type = F_UNUSED;
}
else
dprintf("Left retries: %d\n", f->f_prevcount);
}
else {
dprintf("%s found, resuming.\n", f->f_un.f_forw.f_hname);
bcopy(hp->h_addr, (char *) &f->f_un.f_forw.f_addr.sin_addr, hp->h_length);
f->f_prevcount = 0;
f->f_type = F_FORW;
goto f_forw;
}
}
else
dprintf("Forwarding suspension not over, time " \
"left: %d\n", INET_SUSPEND_TIME - fwd_suspend);
break;
case F_FORW:
/*
* Don't send any message to a remote host if it
* already comes from one. (we don't care 'bout who
* sent the message, we don't send it anyway) -Joey
*/
f_forw:
dprintf(" %s\n", f->f_un.f_forw.f_hname);
if ( strcmp(from, LocalHostName) && NoHops )
dprintf("Not sending message to remote.\n");
else {
f->f_time = now;
(void) sprintf(line, "<%d>%s", f->f_prevpri, \
(char *) iov[4].iov_base);
strcat(line, "\n"); /* ASP */
l = strlen(line);
if (l > MAXLINE)
l = MAXLINE;
if (sendto(finet, line, l, 0, \
(struct sockaddr *) &f->f_un.f_forw.f_addr,
sizeof(f->f_un.f_forw.f_addr)) != l) {
int e = errno;
dprintf("INET sendto error: %d = %s.\n",
e, strerror(e));
f->f_type = F_FORW_SUSP;
errno = e;
logerror("sendto");
}
}
break;
case F_CONSOLE:
f->f_time = now;
#ifdef UNIXPC
if (1) {
#else
if (flags & IGN_CONS) {
#endif
dprintf(" (ignored).\n");
break;
}
/* FALLTHROUGH */
case F_TTY:
case F_FILE:
case F_PIPE:
f->f_time = now;
dprintf(" %s\n", f->f_un.f_fname);
if (f->f_type == F_TTY || f->f_type == F_CONSOLE) {
v->iov_base = "\r\n";
v->iov_len = 2;
} else {
v->iov_base = "\n";
v->iov_len = 1;
}
again:
/* f->f_file == -1 is an indicator that the we couldn't
open the file at startup. */
if (f->f_file == -1)
break;
if (writev(f->f_file, iov, 6) < 0) {
int e = errno;
/* If a named pipe is full, just ignore it for now
- mrn 24 May 96 */
if (f->f_type == F_PIPE && e == EAGAIN)
break;
(void) close(f->f_file);
/*
* Check for EBADF on TTY's due to vhangup() XXX
* Linux uses EIO instead (mrn 12 May 96)
*/
if ((f->f_type == F_TTY || f->f_type == F_CONSOLE)
#ifdef linux
&& e == EIO) {
#else
&& e == EBADF) {
#endif
f->f_file = open(f->f_un.f_fname, O_WRONLY|O_APPEND|O_NOCTTY);
if (f->f_file < 0) {
f->f_type = F_UNUSED;
logerror(f->f_un.f_fname);
} else {
untty();
goto again;
}
} else {
f->f_type = F_UNUSED;
errno = e;
logerror(f->f_un.f_fname);
}
} else if (f->f_flags & SYNC_FILE)
(void) fsync(f->f_file);
break;
case F_USERS:
case F_WALL:
f->f_time = now;
dprintf("\n");
v->iov_base = "\r\n";
v->iov_len = 2;
wallmsg(f, iov);
break;
} /* switch */
if (f->f_type != F_FORW_UNKN)
f->f_prevcount = 0;
return;
}
#if FALSE
}} /* balance parentheses for emacs */
#endif
jmp_buf ttybuf;
void endtty()
{
longjmp(ttybuf, 1);
}
/*
* WALLMSG -- Write a message to the world at large
*
* Write the specified message to either the entire
* world, or a list of approved users.
*/
void wallmsg(f, iov)
register struct filed *f;
struct iovec *iov;
{
char p[6 + UNAMESZ];
register int i;
int ttyf, len;
FILE *uf;
static int reenter = 0;
struct utmp ut;
char greetings[200];
if (reenter++)
return;
/* open the user login file */
if ((uf = fopen(UTMP_FILE, "r")) == NULL) {
logerror(UTMP_FILE);
reenter = 0;
return;
}
/*
* Might as well fork instead of using nonblocking I/O
* and doing notty().
*/
if (fork() == 0) {
(void) signal(SIGTERM, SIG_DFL);
(void) alarm(0);
(void) signal(SIGALRM, endtty);
#ifndef SYSV
(void) signal(SIGTTOU, SIG_IGN);
(void) sigsetmask(0);
#endif
(void) sprintf(greetings,
"\r\n\7Message from syslogd@%s at %.24s ...\r\n",
(char *) iov[2].iov_base, ctime(&now));
len = strlen(greetings);
/* scan the user login file */
while (fread((char *) &ut, sizeof(ut), 1, uf) == 1) {
/* is this slot used? */
if (ut.ut_name[0] == '\0')
continue;
if (ut.ut_type == LOGIN_PROCESS)
continue;
if (!(strcmp (ut.ut_name,"LOGIN"))) /* paranoia */
continue;
/* should we send the message to this user? */
if (f->f_type == F_USERS) {
for (i = 0; i < MAXUNAMES; i++) {
if (!f->f_un.f_uname[i][0]) {
i = MAXUNAMES;
break;
}
if (strncmp(f->f_un.f_uname[i],
ut.ut_name, UNAMESZ) == 0)
break;
}
if (i >= MAXUNAMES)
continue;
}
/* compute the device name */
strcpy(p, _PATH_DEV);
strncat(p, ut.ut_line, UNAMESZ);
if (f->f_type == F_WALL) {
iov[0].iov_base = greetings;
iov[0].iov_len = len;
iov[1].iov_len = 0;
}
if (setjmp(ttybuf) == 0) {
(void) alarm(15);
/* open the terminal */
ttyf = open(p, O_WRONLY|O_NOCTTY);
if (ttyf >= 0) {
struct stat statb;
if (fstat(ttyf, &statb) == 0 &&
(statb.st_mode & S_IWRITE))
(void) writev(ttyf, iov, 6);
close(ttyf);
ttyf = -1;
}
}
(void) alarm(0);
}
exit(0);
}
/* close the user login file */
(void) fclose(uf);
reenter = 0;
}
void reapchild()
{
#if defined(SYSV) && !defined(linux)
(void) signal(SIGCHLD, reapchild); /* reset signal handler -ASP */
wait ((int *)0);
#else
union wait status;
while (wait3(&status, WNOHANG, (struct rusage *) NULL) > 0)
;
#endif
#ifdef linux
(void) signal(SIGCHLD, reapchild); /* reset signal handler -ASP */
#endif
}
/*
* Return a printable representation of a host address.
*/
const char *cvthname(f)
struct sockaddr_in *f;
{
struct hostent *hp;
register char *p;
int count;
if (f->sin_family != AF_INET) {
dprintf("Malformed from address.\n");
return ("???");
}
hp = gethostbyaddr((char *) &f->sin_addr, sizeof(struct in_addr), \
f->sin_family);
if (hp == 0) {
dprintf("Host name for your address (%s) unknown.\n",
inet_ntoa(f->sin_addr));
return (inet_ntoa(f->sin_addr));
}
/*
* Convert to lower case, just like LocalDomain above
*/
for (p = (char *)hp->h_name; *p ; p++)
if (isupper(*p))
*p = tolower(*p);
/*
* Notice that the string still contains the fqdn, but your
* hostname and domain are separated by a '\0'.
*/
if ((p = index(hp->h_name, '.'))) {
if (strcmp(p + 1, LocalDomain) == 0) {
*p = '\0';
return (hp->h_name);
} else {
if (StripDomains) {
count=0;
while (StripDomains[count]) {
if (strcmp(p + 1, StripDomains[count]) == 0) {
*p = '\0';
return (hp->h_name);
}
count++;
}
}
if (LocalHosts) {
count=0;
while (LocalHosts[count]) {
if (!strcmp(hp->h_name, LocalHosts[count])) {
*p = '\0';
return (hp->h_name);
}
count++;
}
}
}
}
return (hp->h_name);
}
void domark()
{
register struct filed *f;
#ifdef SYSV
int lognum;
#endif
now = time(0);
MarkSeq += TIMERINTVL;
if (MarkSeq >= MarkInterval) {
logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK);
MarkSeq = 0;
}
#ifdef SYSV
for (lognum = 0; lognum <= nlogs; lognum++) {
f = &Files[lognum];
#else
for (f = Files; f; f = f->f_next) {
#endif
if (f->f_prevcount && now >= REPEATTIME(f)) {
dprintf("flush %s: repeated %d times, %d sec.\n",
TypeNames[f->f_type], f->f_prevcount,
repeatinterval[f->f_repeatcount]);
fprintlog(f, LocalHostName, 0, (char *)NULL);
BACKOFF(f);
}
}
(void) signal(SIGALRM, domark);
(void) alarm(TIMERINTVL);
}
void debug_switch()
{
dprintf("Switching debugging_on to %s\n", (debugging_on == 0) ? "true" : "false");
debugging_on = (debugging_on == 0) ? 1 : 0;
signal(SIGUSR1, debug_switch);
}
/*
* Print syslogd errors some place.
*/
void logerror(type)
char *type;
{
char buf[100];
dprintf("Called loggerr, msg: %s\n", type);
if (errno == 0)
(void) sprintf(buf, "syslogd: %s", type);
else if ((unsigned) errno > sys_nerr)
(void) sprintf(buf, "syslogd: %s: error %d", type, errno);
else
(void) sprintf(buf, "syslogd: %s: %s", type, sys_errlist[errno]);
errno = 0;
logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
return;
}
void die(sig)
int sig;
{
register struct filed *f;
char buf[100];
int lognum;
for (lognum = 0; lognum <= nlogs; lognum++) {
f = &Files[lognum];
/* flush any pending output */
if (f->f_prevcount)
fprintlog(f, LocalHostName, 0, (char *)NULL);
}
if (sig) {
dprintf("syslogd: exiting on signal %d\n", sig);
(void) sprintf(buf, "exiting on signal %d", sig);
errno = 0;
logerror(buf);
}
/* Close the sockets. */
close(funix);
if (InetInuse) close(inetm);
/* Clean-up files. */
(void) unlink(LogName);
(void) remove_pid(PidFile);
exit(0);
}
/*
* INIT -- Initialize syslogd from configuration table
*/
void init()
{
register int i, lognum;
register FILE *cf;
register struct filed *f, **nextp = (struct filed **) 0;
register char *p;
#ifdef CONT_LINE
char cbuf[BUFSIZ];
char *cline;
#else
char cline[BUFSIZ];
#endif
/*
* Close all open log files and free log descriptor array.
*/
dprintf("Called init.\n");
Initialized = 0;
if ( nlogs > -1 )
{
dprintf("Initializing log structures.\n");
for (lognum = 0; lognum <= nlogs; lognum++ ) {
f = &Files[lognum];
/* flush any pending output */
if (f->f_prevcount)
fprintlog(f, LocalHostName, 0, (char *)NULL);
switch (f->f_type) {
case F_FILE:
case F_PIPE:
case F_TTY:
case F_CONSOLE:
(void) close(f->f_file);
break;
}
}
/*
* This is needed especially when HUPing syslogd as the
* structure would grow infinitively. -Joey
*/
nlogs = -1;
free((void *) Files);
Files = (struct filed *) 0;
}
/* open the configuration file */
if ((cf = fopen(ConfFile, "r")) == NULL) {
dprintf("cannot open %s.\n", ConfFile);
#ifdef SYSV
cfline("*.ERR\t" _PATH_CONSOLE, *nextp);
#else
*nextp = (struct filed *)calloc(1, sizeof(*f));
cfline("*.ERR\t" _PATH_CONSOLE, *nextp);
(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)) /* ASP */
cfline("*.PANIC\t*", (*nextp)->f_next);
#endif
Initialized = 1;
return;
}
/*
* Foreach line in the conf table, open that file.
*/
#ifdef SYSV
lognum = 0;
#else
f = NULL;
#endif
#if CONT_LINE
cline = cbuf;
while (fgets(cline, sizeof(cbuf) - (cline - cbuf), cf) != NULL) {
#else
while (fgets(cline, sizeof(cline), cf) != NULL) {
#endif
/*
* check for end-of-section, comments, strip off trailing
* spaces and newline character.
*/
for (p = cline; isspace(*p); ++p);
if (*p == '\0' || *p == '#')
continue;
#if CONT_LINE
strcpy(cline, p);
#endif
for (p = index(cline, '\0'); isspace(*--p););
#if CONT_LINE
if (*p == '\\') {
if ((p - cbuf) > BUFSIZ - 30) {
/* Oops the buffer is full - what now? */
cline = cbuf;
} else {
*p = 0;
cline = p;
continue;
}
} else
cline = cbuf;
#endif
*++p = '\0';
#ifndef SYSV
f = (struct filed *)calloc(1, sizeof(*f));
*nextp = f;
nextp = &f->f_next;
#endif
allocate_log();
f = &Files[lognum++];
#if CONT_LINE
cfline(cbuf, f);
#else
cfline(cline, f);
#endif
}
/* close the configuration file */
(void) fclose(cf);
Initialized = 1;
if ( Debug ) {
#ifdef SYSV
for (lognum = 0; lognum <= nlogs; lognum++) {
f = &Files[lognum];
if (f->f_type != F_UNUSED) {
printf ("%2d: ", lognum);
#else
for (f = Files; f; f = f->f_next) {
if (f->f_type != F_UNUSED) {
#endif
for (i = 0; i <= LOG_NFACILITIES; i++)
if (f->f_pmask[i] == TABLE_NOPRI)
printf(" X ");
else
printf("%2X ", f->f_pmask[i]);
printf("%s: ", TypeNames[f->f_type]);
switch (f->f_type) {
case F_FILE:
case F_PIPE:
case F_TTY:
case F_CONSOLE:
printf("%s", f->f_un.f_fname);
if (f->f_file == -1)
printf(" (unused)");
break;
case F_FORW:
case F_FORW_SUSP:
case F_FORW_UNKN:
printf("%s", f->f_un.f_forw.f_hname);
break;
case F_USERS:
for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
printf("%s, ", f->f_un.f_uname[i]);
break;
}
printf("\n");
}
}
}
if ( AcceptRemote )
#ifdef DEBRELEASE
logmsg(LOG_SYSLOG|LOG_INFO, "syslogd " VERSION "-" PATCHLEVEL "#" DEBRELEASE \
": restart (remote reception)." , LocalHostName, \
ADDDATE);
#else
logmsg(LOG_SYSLOG|LOG_INFO, "syslogd " VERSION "-" PATCHLEVEL \
": restart (remote reception)." , LocalHostName, \
ADDDATE);
#endif
else
#ifdef DEBRELEASE
logmsg(LOG_SYSLOG|LOG_INFO, "syslogd " VERSION "-" PATCHLEVEL "#" DEBRELEASE \
": restart." , LocalHostName, ADDDATE);
#else
logmsg(LOG_SYSLOG|LOG_INFO, "syslogd " VERSION "-" PATCHLEVEL \
": restart." , LocalHostName, ADDDATE);
#endif
(void) signal(SIGHUP, sighup_handler);
dprintf("syslogd: restarted.\n");
}
#if FALSE
}}} /* balance parentheses for emacs */
#endif
/*
* Crack a configuration file line
*/
void cfline(line, f)
char *line;
register struct filed *f;
{
register char *p;
register char *q;
register int i, i2;
char *bp;
int pri;
int singlpri = 0;
int ignorepri = 0;
int syncfile;
struct hostent *hp;
char buf[MAXLINE];
dprintf("cfline(%s)\n", line);
errno = 0; /* keep sys_errlist stuff out of logerror messages */
/* clear out file entry */
#ifndef SYSV
bzero((char *) f, sizeof(*f));
#endif
for (i = 0; i <= LOG_NFACILITIES; i++) {
f->f_pmask[i] = TABLE_NOPRI;
f->f_flags = 0;
}
/* scan through the list of selectors */
for (p = line; *p && *p != '\t' && *p != ' ';) {
/* find the end of this facility name list */
for (q = p; *q && *q != '\t' && *q++ != '.'; )
continue;
/* collect priority name */
for (bp = buf; *q && !index("\t ,;", *q); )
*bp++ = *q++;
*bp = '\0';
/* skip cruft */
while (index(",;", *q))
q++;
/* decode priority name */
if ( *buf == '!' ) {
ignorepri = 1;
for (bp=buf; *(bp+1); bp++)
*bp=*(bp+1);
*bp='\0';
}
else {
ignorepri = 0;
}
if ( *buf == '=' )
{
singlpri = 1;
pri = decode(&buf[1], PriNames);
}
else {
singlpri = 0;
pri = decode(buf, PriNames);
}
if (pri < 0) {
char xbuf[200];
(void) sprintf(xbuf, "unknown priority name \"%s\"", buf);
logerror(xbuf);
return;
}
/* scan facilities */
while (*p && !index("\t .;", *p)) {
for (bp = buf; *p && !index("\t ,;.", *p); )
*bp++ = *p++;
*bp = '\0';
if (*buf == '*') {
for (i = 0; i < LOG_NFACILITIES; i++) {
if ( pri == INTERNAL_NOPRI ) {
if ( ignorepri )
f->f_pmask[i] = TABLE_ALLPRI;
else
f->f_pmask[i] = TABLE_NOPRI;
}
else if ( singlpri ) {
if ( ignorepri )
f->f_pmask[i] &= ~(1<<pri);
else
f->f_pmask[i] |= (1<<pri);
}
else
{
if ( pri == TABLE_ALLPRI ) {
if ( ignorepri )
f->f_pmask[i] = TABLE_NOPRI;
else
f->f_pmask[i] = TABLE_ALLPRI;
}
else
{
if ( ignorepri )
for (i2= 0; i2 <= pri; ++i2)
f->f_pmask[i] &= ~(1<<i2);
else
for (i2= 0; i2 <= pri; ++i2)
f->f_pmask[i] |= (1<<i2);
}
}
}
} else {
i = decode(buf, FacNames);
if (i < 0) {
char xbuf[200];
(void) sprintf(xbuf, "unknown facility name \"%s\"", buf);
logerror(xbuf);
return;
}
if ( pri == INTERNAL_NOPRI ) {
if ( ignorepri )
f->f_pmask[i >> 3] = TABLE_ALLPRI;
else
f->f_pmask[i >> 3] = TABLE_NOPRI;
} else if ( singlpri ) {
if ( ignorepri )
f->f_pmask[i >> 3] &= ~(1<<pri);
else
f->f_pmask[i >> 3] |= (1<<pri);
} else {
if ( pri == TABLE_ALLPRI ) {
if ( ignorepri )
f->f_pmask[i >> 3] = TABLE_NOPRI;
else
f->f_pmask[i >> 3] = TABLE_ALLPRI;
} else {
if ( ignorepri )
for (i2= 0; i2 <= pri; ++i2)
f->f_pmask[i >> 3] &= ~(1<<i2);
else
for (i2= 0; i2 <= pri; ++i2)
f->f_pmask[i >> 3] |= (1<<i2);
}
}
}
while (*p == ',' || *p == ' ')
p++;
}
p = q;
}
/* skip to action part */
while (*p == '\t' || *p == ' ')
p++;
if (*p == '-')
{
syncfile = 0;
p++;
} else
syncfile = 1;
dprintf("leading char in action: %c\n", *p);
switch (*p)
{
case '@':
#ifdef SYSLOG_INET
if (!InetInuse)
break;
(void) strcpy(f->f_un.f_forw.f_hname, ++p);
dprintf("forwarding host: %s\n", p); /*ASP*/
if ( (hp = gethostbyname(p)) == NULL ) {
f->f_type = F_FORW_UNKN;
f->f_prevcount = INET_RETRY_MAX;
f->f_time = time ( (time_t *)0 );
} else {
f->f_type = F_FORW;
}
bzero((char *) &f->f_un.f_forw.f_addr,
sizeof(f->f_un.f_forw.f_addr));
f->f_un.f_forw.f_addr.sin_family = AF_INET;
f->f_un.f_forw.f_addr.sin_port = LogPort;
if ( f->f_type == F_FORW )
bcopy(hp->h_addr, (char *) &f->f_un.f_forw.f_addr.sin_addr, hp->h_length);
/*
* Otherwise the host might be unknown due to an
* inaccessible nameserver (perhaps on the same
* host). We try to get the ip number later, like
* FORW_SUSP.
*/
#endif
break;
case '|':
case '/':
(void) strcpy(f->f_un.f_fname, p);
dprintf ("filename: %s\n", p); /*ASP*/
if (syncfile)
f->f_flags |= SYNC_FILE;
if ( *p == '|' ) {
f->f_file = open(++p, O_RDWR|O_NONBLOCK);
f->f_type = F_PIPE;
} else {
f->f_file = open(p, O_WRONLY|O_APPEND|O_CREAT|O_NOCTTY,
0644);
f->f_type = F_FILE;
}
if ( f->f_file < 0 ){
f->f_file = -1;
dprintf("Error opening log file: %s\n", p);
logerror(p);
break;
}
if (isatty(f->f_file)) {
f->f_type = F_TTY;
untty();
}
if (strcmp(p, ctty) == 0)
f->f_type = F_CONSOLE;
break;
case '*':
dprintf ("write-all\n");
f->f_type = F_WALL;
break;
default:
dprintf ("users: %s\n", p); /* ASP */
for (i = 0; i < MAXUNAMES && *p; i++) {
for (q = p; *q && *q != ','; )
q++;
(void) strncpy(f->f_un.f_uname[i], p, UNAMESZ);
if ((q - p) > UNAMESZ)
f->f_un.f_uname[i][UNAMESZ] = '\0';
else
f->f_un.f_uname[i][q - p] = '\0';
while (*q == ',' || *q == ' ')
q++;
p = q;
}
f->f_type = F_USERS;
break;
}
return;
}
/*
* Decode a symbolic name to a numeric value
*/
int decode(name, codetab)
char *name;
struct code *codetab;
{
register struct code *c;
register char *p;
char buf[80];
dprintf ("symbolic name: %s", name);
if (isdigit(*name))
{
dprintf ("\n");
return (atoi(name));
}
(void) strncpy(buf, name, 79);
for (p = buf; *p; p++)
if (isupper(*p))
*p = tolower(*p);
for (c = codetab; c->c_name; c++)
if (!strcmp(buf, c->c_name))
{
dprintf (" ==> %d\n", c->c_val);
return (c->c_val);
}
return (-1);
}
static void dprintf(char *fmt, ...)
{
va_list ap;
if ( !(Debug && debugging_on) )
return;
va_start(ap, fmt);
vfprintf(stdout, fmt, ap);
va_end(ap);
fflush(stdout);
return;
}
/*
* The following function is responsible for allocating/reallocating the
* array which holds the structures which define the logging outputs.
*/
static void allocate_log()
{
dprintf("Called allocate_log, nlogs = %d.\n", nlogs);
/*
* Decide whether the array needs to be initialized or needs to
* grow.
*/
if ( nlogs == -1 )
{
Files = (struct filed *) malloc(sizeof(struct filed));
if ( Files == (void *) 0 )
{
dprintf("Cannot initialize log structure.");
logerror("Cannot initialize log structure.");
return;
}
}
else
{
/* Re-allocate the array. */
Files = (struct filed *) realloc(Files, (nlogs+2) * \
sizeof(struct filed));
if ( Files == (struct filed *) 0 )
{
dprintf("Cannot grow log structure.");
logerror("Cannot grow log structure.");
return;
}
}
/*
* Initialize the array element, bump the number of elements in the
* the array and return.
*/
++nlogs;
memset(&Files[nlogs], '\0', sizeof(struct filed));
return;
}
/*
* The following function is resposible for handling a SIGHUP signal. Since
* we are now doing mallocs/free as part of init we had better not being
* doing this during a signal handler. Instead this function simply sets
* a flag variable which will tell the main loop to go through a restart.
*/
void sighup_handler()
{
restart = 1;
signal(SIGHUP, sighup_handler);
return;
}
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