/*
*
* Copyright (c) 1994-2008 Carnegie Mellon University. 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. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* $Id: syslogd.c,v 1.5 2010/01/06 17:02:00 murch Exp $
*/
/*
** This file has been modified to get it to compile more easily
** on pre-4.4BSD (e.g., SysVr4 :-) systems. Rich $alz, June 1991.
*/
/* change these three if you must keep running an old syslog. */
#define _PATH_LOGFILE "/dev/log"
#define _PATH_LOGCONF "/etc/syslog.conf"
#define _PATH_LOGPID "/etc/syslog.pid"
/* #define this to enable verbose debugging of all messages. */
#undef VERBOSE_DEBUG
/* #define this to line to listen on the INET port. */
#undef DO_INET_SOCKET
/* #undef this to not read kernel syslog messages. */
#define _PATH_KLOG "/dev/klog"
#undef _PATH_KLOG
/* set this depending on what your sighandler is. */
/* =()<#define SIGHANDLER @<SIGHANDLER>@>()= */
#define SIGHANDLER void
/* if you need various BSD functions, set this. */
#define NEED_BZERO_ETC
/* Use "union wait" instead of int? */
/* =()<#define @<USE_UNION_WAIT>@_USE_UNION_WAIT>()= */
#define DO_USE_UNION_WAIT
#if defined(DO_USE_UNION_WAIT)
#define WAITVALUE union wait
#else
#define WAITVALUE int
#endif /* defined(DO_USE_UNION_WAIT) */
/*
* 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: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983, 1988 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)syslogd.c 5.42 (Berkeley) 6/29/90";
#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 maximimum 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)
*/
#define MAXLINE 1024 /* maximum line length */
#define MAXSVLINE 120 /* maximum saved line length */
#define DEFUPRI (LOG_USER|LOG_NOTICE)
#define DEFSPRI (LOG_KERN|LOG_CRIT)
#define TIMERINTVL 30 /* interval for checking flush, mark */
#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>
#include <sys/uio.h>
#include <sys/un.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/signal.h>
#ifdef MSG_BSIZE
#undef MSG_BSIZE
#endif
#define MSG_BSIZE 4096
#include <netinet/in.h>
#include <netdb.h>
#include <utmp.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#define SYSLOG_NAMES
#include "syslog.h"
#define UT_NAMESIZE 8
#define _PATH_UTMP "/etc/utmp"
#define _PATH_DEV "/dev/"
#define _PATH_CONSOLE "/dev/console"
#ifndef sigmask
#define sigmask(m) (1 << ((m)-1))
#endif
char *LogName = _PATH_LOGFILE;
char *ConfFile = _PATH_LOGCONF;
char *PidFile = _PATH_LOGPID;
char ctty[] = _PATH_CONSOLE;
#define FDMASK(fd) (1 << (fd))
#define dprintf if (Debug) printf
#define MAXUNAMES 20 /* maximum number of user names */
#ifdef NEED_BZERO_ETC
#include <fcntl.h>
bzero(b, length)
char *b;
int length;
{
while (--length >= 0)
*b++ = '\0';
}
bcopy(b1, b2, length)
char *b1;
char *b2;
int length;
{
while (--length >= 0)
*b2++ = *b1++;
}
setlinebuf(f)
FILE *f;
{
setbuf(f, (char *)NULL);
}
wait3(status, flags, np)
WAITVALUE *status;
int flags;
struct rusage *np;
{
return waitpid(-1, status, WNOHANG);
}
/* Not a general mask handler -- it know what we call, below. */
SIGHANDLER (*oldhup)(), (*oldalrm)();
int
sigsetmask(omask)
int omask;
{
if (omask & sigmask(SIGHUP))
(void) signal(SIGHUP, oldhup);
if (omask & sigmask(SIGALRM))
(void) signal(SIGALRM, oldalrm);
}
int
sigblock(mask)
int mask;
{
if (mask & sigmask(SIGHUP))
oldhup = signal(SIGHUP, SIG_IGN);
if (mask & sigmask(SIGALRM))
oldhup = signal(SIGALRM, SIG_IGN);
}
#endif
/*
* 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 structure represents the files that will have log
* copies printed.
*/
struct filed {
struct filed *f_nextone; /* next in linked list */
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][UT_NAMESIZE+1];
struct {
char f_hname[MAXHOSTNAMELEN+1];
struct sockaddr_in f_addr;
} f_forw; /* forwarding address */
char f_fname[MAXPATHLEN];
} 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 */
};
/*
* 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, 120, 600 }; /* # 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; \
}
/* 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 */
char *TypeNames[7] = {
"UNUSED", "FILE", "TTY", "CONSOLE",
"FORW", "USERS", "WALL"
};
struct filed *Files;
struct filed consfile;
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 */
extern int errno;
extern char *ctime(), *strchr(), *malloc();
SIGHANDLER die(), domark(), init(), reapchild();
int
main(argc, argv)
int argc;
char **argv;
{
register int i;
register char *p;
int funix, inetm, fklog, klogm, len;
struct sockaddr_un sunx, fromunix;
struct sockaddr_in sin, frominet;
FILE *fp;
int ch;
char line[MSG_BSIZE + 1];
extern int optind;
extern char *optarg;
while ((ch = getopt(argc, argv, "df:m:p:")) != EOF)
switch((char)ch) {
case 'd': /* debug */
Debug++;
break;
case 'f': /* configuration file */
ConfFile = optarg;
break;
case 'm': /* mark interval */
MarkInterval = atoi(optarg) * 60;
break;
case 'p': /* path */
LogName = optarg;
break;
case '?':
default:
usage();
}
if (argc -= optind)
usage();
if (!Debug)
daemon(0, 0);
else
setlinebuf(stdout);
consfile.f_type = F_CONSOLE;
(void) strcpy(consfile.f_un.f_fname, ctty);
(void) gethostname(LocalHostName, sizeof LocalHostName);
if (p = strchr(LocalHostName, '.')) {
*p++ = '\0';
LocalDomain = p;
}
else
LocalDomain = "";
(void) signal(SIGTERM, die);
if (Debug) {
(void) signal(SIGINT, die);
(void) signal(SIGQUIT, die);
}
else {
(void) signal(SIGINT, SIG_IGN);
(void) signal(SIGQUIT, SIG_IGN);
}
(void) signal(SIGCHLD, reapchild);
(void) signal(SIGALRM, domark);
(void) alarm(TIMERINTVL);
(void) unlink(LogName);
bzero((char *)&sunx, sizeof(sunx));
sunx.sun_family = AF_UNIX;
(void) strncpy(sunx.sun_path, LogName, sizeof sunx.sun_path);
funix = socket(AF_UNIX, SOCK_DGRAM, 0);
if (funix < 0 || bind(funix, (struct sockaddr *) &sunx,
sizeof(sunx)) < 0 ||
chmod(LogName, 0666) < 0) {
(void) sprintf(line, "cannot create %s", LogName);
logerror(line);
dprintf("cannot create %s (%d)\n", LogName, errno);
die(0);
}
#ifdef DO_INET_SOCKET
finet = socket(AF_INET, SOCK_DGRAM, 0);
if (finet >= 0) {
struct servent *sp;
sp = getservbyname("syslog", "udp");
if (sp == NULL) {
errno = 0;
logerror("syslog/udp: unknown service");
die(0);
}
bzero((char *)&sin, sizeof(sin)); /* added uunet!rbj */
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = LogPort = htons(sp->s_port);
if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
logerror("bind");
if (!Debug)
die(0);
} else {
inetm = FDMASK(finet);
InetInuse = 1;
}
}
#else
finet = -1;
inetm = 0;
#endif /* DO_INET_SOCKET */
#ifdef _PATH_KLOG
if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
klogm = FDMASK(fklog);
else {
dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
klogm = 0;
}
#else
fklog = -1;
klogm = 0;
#endif /* _PATH_KLOG */
/* tuck my process id away */
fp = fopen(PidFile, "w");
if (fp != NULL) {
fprintf(fp, "%d\n", getpid());
(void) fclose(fp);
}
dprintf("off & running....\n");
init();
(void) signal(SIGHUP, init);
for (;;) {
int nfds, readfds = FDMASK(funix) | inetm | klogm;
errno = 0;
dprintf("readfds = %#x\n", readfds);
nfds = select(20, (fd_set *) &readfds, (fd_set *) NULL,
(fd_set *) NULL, (struct timeval *) NULL);
if (nfds == 0)
continue;
if (nfds < 0) {
if (errno != EINTR)
logerror("select");
continue;
}
dprintf("got a message (%d, %#x)\n", nfds, readfds);
if (readfds & klogm) {
i = read(fklog, line, sizeof(line) - 1);
if (i > 0) {
line[i] = '\0';
printsys(line);
} else if (i < 0 && errno != EINTR) {
logerror("klog");
fklog = -1;
klogm = 0;
}
}
if (readfds & FDMASK(funix)) {
len = sizeof fromunix;
i = recvfrom(funix, line, MAXLINE, 0,
(struct sockaddr *) &fromunix, &len);
if (i > 0) {
line[i] = '\0';
printline(LocalHostName, line);
} else if (i < 0 && errno != EINTR)
logerror("recvfrom unix");
}
if (readfds & inetm) {
len = sizeof frominet;
i = recvfrom(finet, line, MAXLINE, 0,
(struct sockaddr *) &frominet, &len);
if (i > 0) {
extern char *cvthname();
line[i] = '\0';
printline(cvthname(&frominet), line);
} else if (i < 0 && errno != EINTR)
logerror("recvfrom inet");
}
}
}
usage()
{
(void) fprintf(stderr,
"usage: syslogd [-d] [-f conffile] [-m markinterval] [-p path]\n");
exit(1);
}
/*
* Take a raw input line, decode the message, and print the message
* on the appropriate log files.
*/
printline(hname, msg)
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;
/* don't allow users to log kernel messages */
if (LOG_FAC(pri) == LOG_KERN)
pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
q = line;
while ((c = *p++ & 0177) != '\0' &&
q < &line[sizeof(line) - 1])
if (iscntrl(c))
if (c == '\n')
*q++ = ' ';
else if (c == '\t')
*q++ = '\t';
else {
*q++ = '^';
*q++ = c ^ 0100;
}
else
*q++ = c;
*q = '\0';
logmsg(pri, line, hname, 0);
}
/*
* Take a raw input line from /dev/klog, split and format similar to syslog().
*/
printsys(msg)
char *msg;
{
register char *p, *q;
register int c;
char line[MAXLINE + 1];
int pri, flags;
char *lp;
(void) strcpy(line, "vmunix: ");
lp = line + strlen(line);
for (p = msg; *p != '\0'; ) {
flags = SYNC_FILE | ADDDATE; /* fsync file after write */
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);
}
}
#ifdef VERBOSE_DEBUG
/*
* Decode a numeric value to a symbolic name
*/
char *
edoced(val, codetab)
int val;
CODE *codetab;
{
register CODE *c;
if (val >= 0)
for (c = codetab; c->c_val != -1; c++)
if (c->c_val == val)
return (c->c_name);
return ("???");
}
#endif
time_t now;
/*
* Log a message to the appropriate log files, users, etc. based on
* the priority.
*/
logmsg(pri, msg, from, flags)
int pri;
char *msg, *from;
int flags;
{
register struct filed *f;
int fac, prilev;
int omask, msglen;
char *timestamp;
time_t time();
#ifdef VERBOSE_DEBUG
if (Debug) {
int pfac = (flags & MARK) ? INTERNAL_MARK : (pri & LOG_FACMASK);
printf("logmsg: {%s.%s} pri %o, flags %x, from %s, msg %s\n",
edoced(pfac, facilitynames),
edoced(LOG_PRI(pri), prioritynames),
pri, flags, from, msg);
}
#else
dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
pri, flags, from, msg);
#endif
omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
/*
* 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, 0);
if (f->f_file >= 0) {
fprintlog(f, flags, msg);
(void) close(f->f_file);
}
(void) sigsetmask(omask);
return;
}
for (f = Files; f; f = f->f_nextone) {
/* skip messages that are incorrect priority */
if ((int)f->f_pmask[fac] < prilev ||
f->f_pmask[fac] == INTERNAL_NOPRI)
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, flags, (char *)NULL);
BACKOFF(f);
}
} else {
/* new line, save it */
if (f->f_prevcount)
fprintlog(f, 0, (char *)NULL);
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;
f->f_prevpri = pri;
(void) strcpy(f->f_prevline, msg);
fprintlog(f, flags, (char *)NULL);
} else {
f->f_prevline[0] = 0;
f->f_prevlen = 0;
fprintlog(f, flags, msg);
}
}
}
(void) sigsetmask(omask);
}
fprintlog(f, flags, msg)
register struct filed *f;
int flags;
char *msg;
{
struct iovec iov[6];
register struct iovec *v;
register int l;
char line[MAXLINE + 1], repbuf[80], greetings[200];
v = iov;
if (f->f_type == F_WALL) {
v->iov_base = greetings;
sprintf(greetings,
"\r\n\7Message from syslogd@%s at %.24s ...\r\n",
f->f_prevhost, ctime(&now));
v->iov_len = strlen(greetings);
v++;
v->iov_base = "";
v->iov_len = 0;
v++;
} else {
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) {
v->iov_base = repbuf;
sprintf(repbuf, "last message repeated %d times",
f->f_prevcount);
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]);
f->f_time = now;
switch (f->f_type) {
case F_UNUSED:
dprintf("\n");
break;
case F_FORW:
dprintf(" %s\n", f->f_un.f_forw.f_hname);
sprintf(line, "<%d>%.15s %s", f->f_prevpri,
iov[0].iov_base, iov[4].iov_base);
l = strlen(line);
if (l > MAXLINE)
l = MAXLINE;
if (sendto(finet, line, l, 0, &f->f_un.f_forw.f_addr,
sizeof f->f_un.f_forw.f_addr) != l) {
int e = errno;
(void) close(f->f_file);
f->f_type = F_UNUSED;
errno = e;
logerror("sendto");
}
break;
case F_CONSOLE:
if (flags & IGN_CONS) {
dprintf(" (ignored)\n");
break;
}
/* FALLTHROUGH */
case F_TTY:
case F_FILE:
dprintf(" %s\n", f->f_un.f_fname);
if (f->f_type != F_FILE) {
v->iov_base = "\r\n";
v->iov_len = 2;
} else {
v->iov_base = "\n";
v->iov_len = 1;
}
again:
if (writev(f->f_file, iov, 6) < 0) {
int e = errno;
(void) close(f->f_file);
/*
* Check for errors on TTY's due to loss of tty
*/
if ((e == EIO || e == EBADF) && f->f_type != F_FILE) {
f->f_file = open(f->f_un.f_fname,
O_WRONLY|O_APPEND, 0);
if (f->f_file < 0) {
f->f_type = F_UNUSED;
logerror(f->f_un.f_fname);
} else
goto again;
} else {
f->f_type = F_UNUSED;
errno = e;
logerror(f->f_un.f_fname);
}
} else if (flags & SYNC_FILE)
(void) fsync(f->f_file);
break;
case F_USERS:
case F_WALL:
dprintf("\n");
v->iov_base = "\r\n";
v->iov_len = 2;
wallmsg(f, iov);
break;
}
f->f_prevcount = 0;
}
/*
* WALLMSG -- Write a message to the world at large
*
* Write the specified message to either the entire
* world, or a list of approved users.
*/
wallmsg(f, iov)
register struct filed *f;
struct iovec *iov;
{
static int reenter; /* avoid calling ourselves */
register FILE *uf;
register int i;
struct utmp ut;
char *p, *ttymsg();
if (reenter++)
return;
if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
logerror(_PATH_UTMP);
reenter = 0;
return;
}
/* NOSTRICT */
while (fread((char *) &ut, sizeof ut, 1, uf) == 1) {
if (ut.ut_name[0] == '\0')
continue;
if (f->f_type == F_WALL) {
if (p = ttymsg(iov, 6, ut.ut_line, 1)) {
errno = 0; /* already in msg */
logerror(p);
}
continue;
}
/* should we send the message to this user? */
for (i = 0; i < MAXUNAMES; i++) {
if (!f->f_un.f_uname[i][0])
break;
if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
UT_NAMESIZE)) {
if (p = ttymsg(iov, 6, ut.ut_line, 1)) {
errno = 0; /* already in msg */
logerror(p);
}
break;
}
}
}
(void) fclose(uf);
reenter = 0;
}
SIGHANDLER
reapchild()
{
WAITVALUE status;
while (wait3(&status, WNOHANG, (struct rusage *) NULL) > 0)
continue;
}
/*
* Return a printable representation of a host address.
*/
char *
cvthname(f)
struct sockaddr_in *f;
{
struct hostent *hp;
register char *p;
extern char *inet_ntoa();
dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr));
if (f->sin_family != AF_INET) {
dprintf("Malformed from address\n");
return ("???");
}
hp = gethostbyaddr(&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));
}
if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0)
*p = '\0';
return (hp->h_name);
}
SIGHANDLER
domark()
{
register struct filed *f;
time_t time();
now = time((time_t *)NULL);
MarkSeq += TIMERINTVL;
if (MarkSeq >= MarkInterval) {
logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK);
MarkSeq = 0;
}
for (f = Files; f; f = f->f_nextone) {
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, 0, (char *)NULL);
BACKOFF(f);
}
}
(void) alarm(TIMERINTVL);
}
static char *
xstrerror()
{
extern int sys_nerr;
extern char *sys_errlist[];
extern int errno;
static char buff[30];
if (errno >= 0 && errno < sys_nerr)
return sys_errlist[errno];
(void)sprintf(buff, "Error code %d\n", errno);
return buff;
}
/*
* Print syslogd errors some place.
*/
logerror(type)
char *type;
{
char buf[100];
if (errno)
(void) sprintf(buf, "syslogd: %s: %s", type, xstrerror(errno));
else
(void) sprintf(buf, "syslogd: %s", type);
errno = 0;
dprintf("%s\n", buf);
logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
}
SIGHANDLER
die(sig)
{
register struct filed *f;
char buf[100];
for (f = Files; f != NULL; f = f->f_nextone) {
/* flush any pending output */
if (f->f_prevcount)
fprintlog(f, 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);
}
(void) unlink(LogName);
exit(0);
}
/*
* INIT -- Initialize syslogd from configuration table
*/
SIGHANDLER
init()
{
register int i;
register FILE *cf;
register struct filed *f, *next, **nextp;
register char *p;
char cline[BUFSIZ];
dprintf("init\n");
/*
* Close all open log files.
*/
Initialized = 0;
for (f = Files; f != NULL; f = next) {
/* flush any pending output */
if (f->f_prevcount)
fprintlog(f, 0, (char *)NULL);
switch (f->f_type) {
case F_FILE:
case F_TTY:
case F_CONSOLE:
case F_FORW:
(void) close(f->f_file);
break;
}
next = f->f_nextone;
free((char *) f);
}
Files = NULL;
nextp = &Files;
/* open the configuration file */
if ((cf = fopen(ConfFile, "r")) == NULL) {
dprintf("cannot open %s\n", ConfFile);
*nextp = (struct filed *)malloc(sizeof(*f));
cfline("*.ERR\t/dev/console", *nextp);
(*nextp)->f_nextone = (struct filed *)malloc(sizeof(*f));
cfline("*.PANIC\t*", (*nextp)->f_nextone);
Initialized = 1;
return;
}
/*
* Foreach line in the conf table, open that file.
*/
f = NULL;
while (fgets(cline, sizeof cline, cf) != NULL) {
/*
* check for end-of-section, comments, strip off trailing
* spaces and newline character.
*/
for (p = cline; isspace(*p); ++p);
if (*p == NULL || *p == '#')
continue;
for (p = strchr(cline, '\0'); isspace(*--p););
*++p = '\0';
f = (struct filed *)malloc(sizeof(*f));
*nextp = f;
nextp = &f->f_nextone;
cfline(cline, f);
}
/* close the configuration file */
(void) fclose(cf);
Initialized = 1;
if (Debug) {
for (f = Files; f; f = f->f_nextone) {
for (i = 0; i <= LOG_NFACILITIES; i++)
if (f->f_pmask[i] == INTERNAL_NOPRI)
printf("X ");
else
printf("%d ", f->f_pmask[i]);
printf("%s: ", TypeNames[f->f_type]);
switch (f->f_type) {
case F_FILE:
case F_TTY:
case F_CONSOLE:
printf("%s", f->f_un.f_fname);
break;
case F_FORW:
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");
}
}
logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
dprintf("syslogd: restarted\n");
}
/*
* Crack a configuration file line
*/
cfline(line, f)
char *line;
register struct filed *f;
{
register char *p;
register char *q;
register int i;
char *bp;
int pri;
struct hostent *hp;
char buf[MAXLINE];
dprintf("cfline(%s)\n", line);
errno = 0; /* keep strerror() stuff out of logerror messages */
/* clear out file entry */
bzero((char *) f, sizeof *f);
for (i = 0; i <= LOG_NFACILITIES; i++)
f->f_pmask[i] = INTERNAL_NOPRI;
/* scan through the list of selectors */
for (p = line; *p && *p != '\t';) {
/* find the end of this facility name list */
for (q = p; *q && *q != '\t' && *q++ != '.'; )
continue;
/* collect priority name */
for (bp = buf; *q && !strchr("\t,;", *q); )
*bp++ = *q++;
*bp = '\0';
/* skip cruft */
while (strchr(", ;", *q))
q++;
/* decode priority name */
pri = decode(buf, prioritynames);
if (pri < 0) {
char xbuf[200];
(void) sprintf(xbuf, "unknown priority name \"%s\"",
buf);
logerror(xbuf);
return;
}
/* scan facilities */
while (*p && !strchr("\t.;", *p)) {
for (bp = buf; *p && !strchr("\t,;.", *p); )
*bp++ = *p++;
*bp = '\0';
if (*buf == '*')
for (i = 0; i < LOG_NFACILITIES; i++)
f->f_pmask[i] = pri;
else {
i = decode(buf, facilitynames);
if (i < 0) {
char xbuf[200];
(void) sprintf(xbuf,
"unknown facility name \"%s\"",
buf);
logerror(xbuf);
return;
}
f->f_pmask[i >> 3] = pri;
}
while (*p == ',' || *p == ' ')
p++;
}
p = q;
}
/* skip to action part */
while (*p == '\t')
p++;
switch (*p)
{
case '@':
if (!InetInuse)
break;
(void) strcpy(f->f_un.f_forw.f_hname, ++p);
hp = gethostbyname(p);
if (hp == NULL) {
logerror("hostname lookup error");
break;
}
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;
bcopy(hp->h_addr, (char *) &f->f_un.f_forw.f_addr.sin_addr, hp->h_length);
f->f_type = F_FORW;
break;
case '/':
(void) strcpy(f->f_un.f_fname, p);
if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
f->f_file = F_UNUSED;
logerror(p);
break;
}
if (isatty(f->f_file))
f->f_type = F_TTY;
else
f->f_type = F_FILE;
if (strcmp(p, ctty) == 0)
f->f_type = F_CONSOLE;
break;
case '*':
f->f_type = F_WALL;
break;
default:
for (i = 0; i < MAXUNAMES && *p; i++) {
for (q = p; *q && *q != ','; )
q++;
(void) strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
if ((q - p) > UT_NAMESIZE)
f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
else
f->f_un.f_uname[i][q - p] = '\0';
while (*q == ',' || *q == ' ')
q++;
p = q;
}
f->f_type = F_USERS;
break;
}
}
/*
* Decode a symbolic name to a numeric value
*/
decode(name, codetab)
char *name;
CODE *codetab;
{
register CODE *c;
register char *p;
char buf[40];
if (isdigit(*name))
return (atoi(name));
(void) strcpy(buf, name);
for (p = buf; *p; p++)
if (isupper(*p))
*p = tolower(*p);
for (c = codetab; c->c_name; c++)
if (!strcmp(buf, c->c_name))
return (c->c_val);
return (-1);
}
daemon(nochdir, noclose)
int nochdir, noclose;
{
int cpid;
if ((cpid = fork()) == -1)
return (-1);
if (cpid)
exit(0);
(void) setsid();
if (!nochdir)
(void) chdir("/");
if (!noclose) {
int devnull = open("/dev/null", O_RDWR, 0);
if (devnull != -1) {
(void) dup2(devnull, 0);
(void) dup2(devnull, 1);
(void) dup2(devnull, 2);
if (devnull > 2)
(void) close(devnull);
}
}
}
/*
* Display the contents of a uio structure on a terminal. Used by wall(1)
* and syslogd(8). Forks and finishes in child if write would block, waiting
* at most five minutes. Returns pointer to error string on unexpected error;
* string is not newline-terminated. Various "normal" errors are ignored
* (exclusive-use, lack of permission, etc.).
*/
char *
ttymsg(iov, iovcnt, line)
struct iovec *iov;
int iovcnt;
char *line;
{
static char device[64] = _PATH_DEV;
static char errbuf[1024];
register int cnt, fd, left, wret;
struct iovec localiov[6];
int forked = 0;
if (iovcnt > 6)
return ("too many iov's");
/*
* open will fail on slip lines or exclusive-use lines
* if not running as root; not an error.
*/
(void) strcpy(device + sizeof(_PATH_DEV) - 1, line);
if ((fd = open(device, O_WRONLY|O_NONBLOCK, 0)) < 0) {
if (errno == EBUSY || errno == EACCES)
return (NULL);
(void) sprintf(errbuf, "%s: error %d", device, errno);
return (errbuf);
}
for (cnt = left = 0; cnt < iovcnt; ++cnt)
left += iov[cnt].iov_len;
for (;;) {
wret = writev(fd, iov, iovcnt);
if (wret >= left)
break;
if (wret >= 0) {
left -= wret;
if (iov != localiov) {
bcopy(iov, localiov,
iovcnt * sizeof(struct iovec));
iov = localiov;
}
for (cnt = 0; wret >= iov->iov_len; ++cnt) {
wret -= iov->iov_len;
++iov;
--iovcnt;
}
if (wret) {
iov->iov_base += wret;
iov->iov_len -= wret;
}
continue;
}
if (errno == EWOULDBLOCK) {
int cpid, off = 0;
if (forked) {
(void) close(fd);
_exit(1);
}
cpid = fork();
if (cpid < 0) {
(void) sprintf(errbuf,
"fork: error %d", errno);
(void) close(fd);
return (errbuf);
}
if (cpid) { /* parent */
(void) close(fd);
return (NULL);
}
forked++;
/* wait at most 5 minutes */
(void) signal(SIGALRM, SIG_DFL);
(void) signal(SIGTERM, SIG_DFL); /* XXX */
(void) sigsetmask(0);
(void) alarm((u_int)(60 * 5));
(void) fcntl(fd, FNDELAY, &off);
continue;
}
/*
* We get ENODEV on a slip line if we're running as root,
* and EIO if the line just went away.
*/
if (errno == ENODEV || errno == EIO)
break;
(void) close(fd);
if (forked)
_exit(1);
(void) sprintf(errbuf, "%s: error %d", errno);
return (errbuf);
}
(void) close(fd);
if (forked)
_exit(0);
return (NULL);
}