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freebsd-nq/usr.sbin/syslogd/syslogd.c
Philippe Charnier b8b7e105a9 Cosmetic in usage string.
1997-10-20 12:55:49 +00:00

1750 lines
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/*
* Copyright (c) 1983, 1988, 1993, 1994
* 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.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1988, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94";
#endif
static const char rcsid[] =
"$Id$";
#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)
* Extension to log by program name as well as facility and priority
* by Peter da Silva.
*/
#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 */
#define TTYMSGTIME 1 /* timed out passed to ttymsg */
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/msgbuf.h>
#include <sys/queue.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/syslimits.h>
#include <paths.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <regex.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <utmp.h>
#include "pathnames.h"
#define SYSLOG_NAMES
#include <sys/syslog.h>
const char *LogName = _PATH_LOG;
const char *ConfFile = _PATH_LOGCONF;
const char *PidFile = _PATH_LOGPID;
const char ctty[] = _PATH_CONSOLE;
#define FDMASK(fd) (1 << (fd))
#define dprintf if (Debug) printf
#define MAXUNAMES 20 /* maximum number of user names */
/*
* 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_next; /* 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 */
char *f_program; /* program this applies to */
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];
struct {
char f_pname[MAXPATHLEN];
pid_t f_pid;
} f_pipe;
} 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 */
};
/*
* Queue of about-to-be dead processes we should watch out for.
*/
TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
struct stailhead *deadq_headp;
struct deadq_entry {
pid_t dq_pid;
int dq_timeout;
TAILQ_ENTRY(deadq_entry) dq_entries;
};
/*
* The timeout to apply to processes waiting on the dead queue. Unit
* of measure is `mark intervals', i.e. 20 minutes by default.
* Processes on the dead queue will be terminated after that time.
*/
#define DQ_TIMO_INIT 2
typedef struct deadq_entry *dq_t;
/*
* Struct to hold records of network addresses that are allowed to log
* to us.
*/
struct allowedpeer {
int isnumeric;
u_short port;
union {
struct {
struct in_addr addr;
struct in_addr mask;
} numeric;
char *name;
} u;
#define a_addr u.numeric.addr
#define a_mask u.numeric.mask
#define a_name u.name
};
/*
* 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 */
#define F_PIPE 7 /* pipe to program */
char *TypeNames[8] = {
"UNUSED", "FILE", "TTY", "CONSOLE",
"FORW", "USERS", "WALL", "PIPE"
};
struct filed *Files;
struct filed consfile;
int Debug; /* debug flag */
char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */
char *LocalDomain; /* our local domain name */
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 SecureMode = 0; /* when true, speak only unix domain socks */
int created_lsock = 0; /* Flag if local socket created */
char bootfile[MAXLINE+1]; /* booted kernel file */
struct allowedpeer *AllowedPeers;
int NumAllowed = 0; /* # of AllowedPeer entries */
int allowaddr __P((char *));
void cfline __P((char *, struct filed *, char *));
char *cvthname __P((struct sockaddr_in *));
void deadq_enter __P((pid_t));
int decode __P((const char *, CODE *));
void die __P((int));
void domark __P((int));
void fprintlog __P((struct filed *, int, char *));
void init __P((int));
void logerror __P((const char *));
void logmsg __P((int, char *, char *, int));
void printline __P((char *, char *));
void printsys __P((char *));
int p_open __P((char *, pid_t *));
void reapchild __P((int));
char *ttymsg __P((struct iovec *, int, char *, int));
static void usage __P((void));
int validate __P((struct sockaddr_in *, const char *));
void wallmsg __P((struct filed *, struct iovec *));
int waitdaemon __P((int, int, int));
void timedout __P((int));
int
main(argc, argv)
int argc;
char *argv[];
{
int ch, funix, i, inetm, fklog, klogm, len;
struct sockaddr_un sunx, fromunix;
struct sockaddr_in sin, frominet;
FILE *fp;
char *p, *hname, line[MSG_BSIZE + 1];
struct timeval tv, *tvp;
pid_t ppid;
while ((ch = getopt(argc, argv, "a:dsf:m:p:")) != -1)
switch(ch) {
case 'd': /* debug */
Debug++;
break;
case 'a': /* allow specific network addresses only */
if (allowaddr(optarg) == -1)
usage();
break;
case 'f': /* configuration file */
ConfFile = optarg;
break;
case 'm': /* mark interval */
MarkInterval = atoi(optarg) * 60;
break;
case 'p': /* path */
LogName = optarg;
break;
case 's': /* no network mode */
SecureMode++;
break;
case '?':
default:
usage();
}
if ((argc -= optind) != 0)
usage();
if (!Debug) {
ppid = waitdaemon(0, 0, 30);
if (ppid < 0)
err(1, "could not become daemon");
} else
setlinebuf(stdout);
if (NumAllowed)
endservent();
consfile.f_type = F_CONSOLE;
(void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1);
(void)gethostname(LocalHostName, sizeof(LocalHostName));
if ((p = strchr(LocalHostName, '.')) != NULL) {
*p++ = '\0';
LocalDomain = p;
} else
LocalDomain = "";
(void)strcpy(bootfile, getbootfile());
(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(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */
(void)alarm(TIMERINTVL);
TAILQ_INIT(&deadq_head);
#ifndef SUN_LEN
#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
#endif
memset(&sunx, 0, sizeof(sunx));
sunx.sun_family = AF_UNIX;
(void)strncpy(sunx.sun_path, LogName, sizeof(sunx.sun_path));
(void)unlink(LogName);
funix = socket(AF_UNIX, SOCK_DGRAM, 0);
if (funix < 0 ||
bind(funix, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
chmod(LogName, 0666) < 0) {
(void) snprintf(line, sizeof line, "cannot create %s", LogName);
logerror(line);
dprintf("cannot create %s (%d)\n", LogName, errno);
die(0);
} else
created_lsock = 1;
inetm = 0;
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);
}
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = LogPort = sp->s_port;
if (!SecureMode) {
if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
logerror("bind");
if (!Debug)
die(0);
} else {
inetm = FDMASK(finet);
}
}
}
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;
}
/* 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(0);
(void)signal(SIGHUP, init);
tvp = &tv;
tv.tv_sec = tv.tv_usec = 0;
for (;;) {
int nfds, readfds = FDMASK(funix) | inetm | klogm;
dprintf("readfds = %#x\n", readfds);
nfds = select(20, (fd_set *)&readfds, (fd_set *)NULL,
(fd_set *)NULL, tvp);
if (nfds == 0) {
if (tvp) {
tvp = NULL;
if (ppid != 1)
kill(ppid, SIGALRM);
}
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) {
line[i] = '\0';
hname = cvthname(&frominet);
if (validate(&frominet, hname))
printline(hname, line);
} else if (i < 0 && errno != EINTR)
logerror("recvfrom inet");
}
}
}
static void
usage()
{
fprintf(stderr, "%s\n%s\n",
"usage: syslogd [-ds] [-a allowed_peer] [-f config_file]",
" [-m mark_interval] [-p log_socket]");
exit(1);
}
/*
* Take a raw input line, decode the message, and print the message
* on the appropriate log files.
*/
void
printline(hname, msg)
char *hname;
char *msg;
{
int c, pri;
char *p, *q, line[MAXLINE + 1];
/* 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().
*/
void
printsys(msg)
char *msg;
{
int c, pri, flags;
char *lp, *p, *q, line[MAXLINE + 1];
(void)strcpy(line, bootfile);
(void)strcat(line, ": ");
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);
}
}
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, *from;
int flags;
{
struct filed *f;
int fac, msglen, omask, prilev;
char *timestamp;
char prog[NAME_MAX+1];
int i;
dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
pri, flags, from, msg);
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;
}
/* skip leading blanks */
while(isspace(*msg)) {
msg++;
msglen--;
}
/* extract facility and priority level */
if (flags & MARK)
fac = LOG_NFACILITIES;
else
fac = LOG_FAC(pri);
prilev = LOG_PRI(pri);
/* extract program name */
for(i = 0; i < NAME_MAX; i++) {
if(!isalnum(msg[i]))
break;
prog[i] = msg[i];
}
prog[i] = 0;
/* 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_next) {
/* skip messages that are incorrect priority */
if (f->f_pmask[fac] < prilev ||
f->f_pmask[fac] == INTERNAL_NOPRI)
continue;
/* skip messages with the incorrect program name */
if(f->f_program)
if(strcmp(prog, f->f_program) != 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, flags, (char *)NULL);
BACKOFF(f);
}
} else {
/* new line, save it */
if (f->f_prevcount)
fprintlog(f, 0, (char *)NULL);
f->f_repeatcount = 0;
f->f_prevpri = pri;
(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, flags, (char *)NULL);
} else {
f->f_prevline[0] = 0;
f->f_prevlen = 0;
fprintlog(f, flags, msg);
}
}
}
(void)sigsetmask(omask);
}
void
fprintlog(f, flags, msg)
struct filed *f;
int flags;
char *msg;
{
struct iovec iov[6];
struct iovec *v;
int l;
char line[MAXLINE + 1], repbuf[80], greetings[200];
char *msgret;
v = iov;
if (f->f_type == F_WALL) {
v->iov_base = greetings;
v->iov_len = snprintf(greetings, sizeof greetings,
"\r\n\7Message from syslogd@%s at %.24s ...\r\n",
f->f_prevhost, ctime(&now));
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;
v->iov_len = sprintf(repbuf, "last message repeated %d times",
f->f_prevcount);
} 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);
l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
f->f_prevpri, iov[0].iov_base, iov[4].iov_base);
if (l > MAXLINE)
l = MAXLINE;
if ((finet >= 0) &&
(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;
(void)close(f->f_file);
f->f_type = F_UNUSED;
errno = e;
logerror("sendto");
}
break;
case F_FILE:
dprintf(" %s\n", f->f_un.f_fname);
v->iov_base = "\n";
v->iov_len = 1;
if (writev(f->f_file, iov, 6) < 0) {
int e = errno;
(void)close(f->f_file);
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_PIPE:
dprintf(" %s\n", f->f_un.f_pipe.f_pname);
v->iov_base = "\n";
v->iov_len = 1;
if (f->f_un.f_pipe.f_pid == 0) {
if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
&f->f_un.f_pipe.f_pid)) < 0) {
f->f_type = F_UNUSED;
logerror(f->f_un.f_pipe.f_pname);
break;
}
}
if (writev(f->f_file, iov, 6) < 0) {
int e = errno;
(void)close(f->f_file);
if (f->f_un.f_pipe.f_pid > 0)
deadq_enter(f->f_un.f_pipe.f_pid);
f->f_un.f_pipe.f_pid = 0;
errno = e;
logerror(f->f_un.f_pipe.f_pname);
}
break;
case F_CONSOLE:
if (flags & IGN_CONS) {
dprintf(" (ignored)\n");
break;
}
/* FALLTHROUGH */
case F_TTY:
dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
v->iov_base = "\r\n";
v->iov_len = 2;
errno = 0; /* ttymsg() only sometimes returns an errno */
if ((msgret = ttymsg(iov, 6, f->f_un.f_fname, 10))) {
f->f_type = F_UNUSED;
logerror(msgret);
}
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.
*/
void
wallmsg(f, iov)
struct filed *f;
struct iovec *iov;
{
static int reenter; /* avoid calling ourselves */
FILE *uf;
struct utmp ut;
int i;
char *p;
char line[sizeof(ut.ut_line) + 1];
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;
strncpy(line, ut.ut_line, sizeof(ut.ut_line));
line[sizeof(ut.ut_line)] = '\0';
if (f->f_type == F_WALL) {
if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) != NULL) {
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, line, TTYMSGTIME))
!= NULL) {
errno = 0; /* already in msg */
logerror(p);
}
break;
}
}
}
(void)fclose(uf);
reenter = 0;
}
void
reapchild(signo)
int signo;
{
int status, code;
pid_t pid;
struct filed *f;
char buf[256];
const char *reason;
dq_t q;
while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
if (!Initialized)
/* Don't tell while we are initting. */
continue;
/* First, look if it's a process from the dead queue. */
for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
if (q->dq_pid == pid) {
TAILQ_REMOVE(&deadq_head, q, dq_entries);
free(q);
goto oncemore;
}
/* Now, look in list of active processes. */
for (f = Files; f; f = f->f_next)
if (f->f_type == F_PIPE &&
f->f_un.f_pipe.f_pid == pid) {
(void)close(f->f_file);
errno = 0; /* Keep strerror() stuff out of logerror messages. */
f->f_un.f_pipe.f_pid = 0;
if (WIFSIGNALED(status)) {
reason = "due to signal";
code = WTERMSIG(status);
} else {
reason = "with status";
code = WEXITSTATUS(status);
if (code == 0)
goto oncemore; /* Exited OK. */
}
(void)snprintf(buf, sizeof buf,
"Logging subprocess %d (%s) exited %s %d.",
pid, f->f_un.f_pipe.f_pname,
reason, code);
logerror(buf);
break;
}
oncemore:
}
}
/*
* Return a printable representation of a host address.
*/
char *
cvthname(f)
struct sockaddr_in *f;
{
struct hostent *hp;
char *p;
dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr));
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));
}
if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0)
*p = '\0';
return (hp->h_name);
}
void
domark(signo)
int signo;
{
struct filed *f;
dq_t q;
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_next) {
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);
}
}
/* Walk the dead queue, and see if we should signal somebody. */
for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
switch (q->dq_timeout) {
case 0:
/* Already signalled once, try harder now. */
kill(q->dq_pid, SIGKILL);
break;
case 1:
/*
* Timed out on dead queue, send terminate
* signal. Note that we leave the removal
* from the dead queue to reapchild(), which
* will also log the event.
*/
kill(q->dq_pid, SIGTERM);
/* FALLTROUGH */
default:
q->dq_timeout--;
}
(void)alarm(TIMERINTVL);
}
/*
* Print syslogd errors some place.
*/
void
logerror(type)
const char *type;
{
char buf[512];
if (errno)
(void)snprintf(buf,
sizeof buf, "syslogd: %s: %s", type, strerror(errno));
else
(void)snprintf(buf, sizeof buf, "syslogd: %s", type);
errno = 0;
dprintf("%s\n", buf);
logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
}
void
die(signo)
int signo;
{
struct filed *f;
int was_initialized;
char buf[100];
was_initialized = Initialized;
Initialized = 0; /* Don't log SIGCHLDs. */
for (f = Files; f != NULL; f = f->f_next) {
/* flush any pending output */
if (f->f_prevcount)
fprintlog(f, 0, (char *)NULL);
if (f->f_type == F_PIPE)
(void)close(f->f_file);
}
Initialized = was_initialized;
if (signo) {
dprintf("syslogd: exiting on signal %d\n", signo);
(void)sprintf(buf, "exiting on signal %d", signo);
errno = 0;
logerror(buf);
}
if (created_lsock)
(void)unlink(LogName);
exit(1);
}
/*
* INIT -- Initialize syslogd from configuration table
*/
void
init(signo)
int signo;
{
int i;
FILE *cf;
struct filed *f, *next, **nextp;
char *p;
char cline[LINE_MAX];
char prog[NAME_MAX+1];
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_FORW:
case F_CONSOLE:
case F_TTY:
(void)close(f->f_file);
break;
case F_PIPE:
(void)close(f->f_file);
if (f->f_un.f_pipe.f_pid > 0)
deadq_enter(f->f_un.f_pipe.f_pid);
f->f_un.f_pipe.f_pid = 0;
break;
}
next = f->f_next;
if(f->f_program) free(f->f_program);
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 *)calloc(1, sizeof(*f));
cfline("*.ERR\t/dev/console", *nextp, "*");
(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
cfline("*.PANIC\t*", (*nextp)->f_next, "*");
Initialized = 1;
return;
}
/*
* Foreach line in the conf table, open that file.
*/
f = NULL;
strcpy(prog, "*");
while (fgets(cline, sizeof(cline), cf) != NULL) {
/*
* check for end-of-section, comments, strip off trailing
* spaces and newline character. #!prog is treated specially:
* following lines apply only to that program.
*/
for (p = cline; isspace(*p); ++p)
continue;
if (*p == 0)
continue;
if(*p == '#') {
p++;
if(*p!='!')
continue;
}
if(*p=='!') {
p++;
while(isspace(*p)) p++;
if(!*p) {
strcpy(prog, "*");
continue;
}
for(i = 0; i < NAME_MAX; i++) {
if(!isalnum(p[i]))
break;
prog[i] = p[i];
}
prog[i] = 0;
continue;
}
for (p = strchr(cline, '\0'); isspace(*--p);)
continue;
*++p = '\0';
f = (struct filed *)calloc(1, sizeof(*f));
*nextp = f;
nextp = &f->f_next;
cfline(cline, f, prog);
}
/* close the configuration file */
(void)fclose(cf);
Initialized = 1;
if (Debug) {
for (f = Files; f; f = f->f_next) {
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:
printf("%s", f->f_un.f_fname);
break;
case F_CONSOLE:
case F_TTY:
printf("%s%s", _PATH_DEV, f->f_un.f_fname);
break;
case F_FORW:
printf("%s", f->f_un.f_forw.f_hname);
break;
case F_PIPE:
printf("%s", f->f_un.f_pipe.f_pname);
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;
}
if(f->f_program) {
printf(" (%s)", f->f_program);
}
printf("\n");
}
}
logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
dprintf("syslogd: restarted\n");
}
/*
* Crack a configuration file line
*/
void
cfline(line, f, prog)
char *line;
struct filed *f;
char *prog;
{
struct hostent *hp;
int i, pri;
char *bp, *p, *q;
char buf[MAXLINE], ebuf[100];
dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog);
errno = 0; /* keep strerror() stuff out of logerror messages */
/* clear out file entry */
memset(f, 0, sizeof(*f));
for (i = 0; i <= LOG_NFACILITIES; i++)
f->f_pmask[i] = INTERNAL_NOPRI;
/* save program name if any */
if(prog && *prog=='*') prog = NULL;
if(prog) {
f->f_program = calloc(1, strlen(prog)+1);
if(f->f_program) {
strcpy(f->f_program, prog);
}
}
/* 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 */
if (*buf == '*')
pri = LOG_PRIMASK + 1;
else {
pri = decode(buf, prioritynames);
if (pri < 0) {
(void)snprintf(ebuf, sizeof ebuf,
"unknown priority name \"%s\"", buf);
logerror(ebuf);
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) {
(void)snprintf(ebuf, sizeof ebuf,
"unknown facility name \"%s\"",
buf);
logerror(ebuf);
return;
}
f->f_pmask[i >> 3] = pri;
}
while (*p == ',' || *p == ' ')
p++;
}
p = q;
}
/* skip to action part */
while (*p == '\t')
p++;
switch (*p)
{
case '@':
(void)strcpy(f->f_un.f_forw.f_hname, ++p);
hp = gethostbyname(p);
if (hp == NULL) {
extern int h_errno;
logerror(hstrerror(h_errno));
break;
}
memset(&f->f_un.f_forw.f_addr, 0,
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;
memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length);
f->f_type = F_FORW;
break;
case '/':
if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
f->f_type = F_UNUSED;
logerror(p);
break;
}
if (isatty(f->f_file)) {
if (strcmp(p, ctty) == 0)
f->f_type = F_CONSOLE;
else
f->f_type = F_TTY;
(void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1);
} else {
(void)strcpy(f->f_un.f_fname, p);
f->f_type = F_FILE;
}
break;
case '|':
f->f_un.f_pipe.f_pid = 0;
(void)strcpy(f->f_un.f_pipe.f_pname, p + 1);
f->f_type = F_PIPE;
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
*/
int
decode(name, codetab)
const char *name;
CODE *codetab;
{
CODE *c;
char *p, buf[40];
if (isdigit(*name))
return (atoi(name));
for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
if (isupper(*name))
*p = tolower(*name);
else
*p = *name;
}
*p = '\0';
for (c = codetab; c->c_name; c++)
if (!strcmp(buf, c->c_name))
return (c->c_val);
return (-1);
}
/*
* fork off and become a daemon, but wait for the child to come online
* before returing to the parent, or we get disk thrashing at boot etc.
* Set a timer so we don't hang forever if it wedges.
*/
int
waitdaemon(nochdir, noclose, maxwait)
int nochdir, noclose, maxwait;
{
int fd;
int status;
pid_t pid, childpid;
switch (childpid = fork()) {
case -1:
return (-1);
case 0:
break;
default:
signal(SIGALRM, timedout);
alarm(maxwait);
while ((pid = wait3(&status, 0, NULL)) != -1) {
if (WIFEXITED(status))
errx(1, "child pid %d exited with return code %d",
pid, WEXITSTATUS(status));
if (WIFSIGNALED(status))
errx(1, "child pid %d exited on signal %d%s",
pid, WTERMSIG(status),
WCOREDUMP(status) ? " (core dumped)" :
"");
if (pid == childpid) /* it's gone... */
break;
}
exit(0);
}
if (setsid() == -1)
return (-1);
if (!nochdir)
(void)chdir("/");
if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
(void)dup2(fd, STDIN_FILENO);
(void)dup2(fd, STDOUT_FILENO);
(void)dup2(fd, STDERR_FILENO);
if (fd > 2)
(void)close (fd);
}
return (getppid());
}
/*
* We get a SIGALRM from the child when it's running and finished doing it's
* fsync()'s or O_SYNC writes for all the boot messages.
*
* We also get a signal from the kernel if the timer expires, so check to
* see what happened.
*/
void
timedout(sig)
int sig __unused;
{
int left;
left = alarm(0);
signal(SIGALRM, SIG_DFL);
if (left == 0)
errx(1, "timed out waiting for child");
else
exit(0);
}
/*
* Add `s' to the list of allowable peer addresses to accept messages
* from.
*
* `s' is a string in the form:
*
* [*]domainname[:{servicename|portnumber|*}]
*
* or
*
* netaddr/maskbits[:{servicename|portnumber|*}]
*
* Returns -1 on error, 0 if the argument was valid.
*/
int
allowaddr(s)
char *s;
{
char *cp1, *cp2;
struct allowedpeer ap;
struct servent *se;
regex_t re;
int i;
if ((cp1 = strrchr(s, ':'))) {
/* service/port provided */
*cp1++ = '\0';
if (strlen(cp1) == 1 && *cp1 == '*')
/* any port allowed */
ap.port = htons(0);
else if ((se = getservbyname(cp1, "udp")))
ap.port = se->s_port;
else {
ap.port = htons((int)strtol(cp1, &cp2, 0));
if (*cp2 != '\0')
return -1; /* port not numeric */
}
} else {
if ((se = getservbyname("syslog", "udp")))
ap.port = se->s_port;
else
/* sanity, should not happen */
ap.port = htons(514);
}
/* the regexp's are ugly, but the cleanest way */
if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$",
REG_EXTENDED))
/* if RE compilation fails, that's an internal error */
abort();
if (regexec(&re, s, 0, 0, 0) == 0) {
/* arg `s' is numeric */
ap.isnumeric = 1;
if ((cp1 = strchr(s, '/')) != NULL) {
*cp1++ = '\0';
i = atoi(cp1);
if (i < 0 || i > 32)
return -1;
/* convert masklen to netmask */
ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1));
}
if (ascii2addr(AF_INET, s, &ap.a_addr) == -1)
return -1;
if (cp1 == NULL) {
/* use default netmask */
if (IN_CLASSA(ntohl(ap.a_addr.s_addr)))
ap.a_mask.s_addr = htonl(IN_CLASSA_NET);
else if (IN_CLASSB(ntohl(ap.a_addr.s_addr)))
ap.a_mask.s_addr = htonl(IN_CLASSB_NET);
else
ap.a_mask.s_addr = htonl(IN_CLASSC_NET);
}
} else {
/* arg `s' is domain name */
ap.isnumeric = 0;
ap.a_name = s;
}
regfree(&re);
if (Debug) {
printf("allowaddr: rule %d: ", NumAllowed);
if (ap.isnumeric) {
printf("numeric, ");
printf("addr = %s, ",
addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0));
printf("mask = %s; ",
addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0));
} else
printf("domainname = %s; ", ap.a_name);
printf("port = %d\n", ntohs(ap.port));
}
if ((AllowedPeers = realloc(AllowedPeers,
++NumAllowed * sizeof(struct allowedpeer)))
== NULL) {
fprintf(stderr, "Out of memory!\n");
exit(EX_OSERR);
}
memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
return 0;
}
/*
* Validate that the remote peer has permission to log to us.
*/
int
validate(sin, hname)
struct sockaddr_in *sin;
const char *hname;
{
int i;
size_t l1, l2;
char *cp, name[MAXHOSTNAMELEN];
struct allowedpeer *ap;
if (NumAllowed == 0)
/* traditional behaviour, allow everything */
return 1;
strncpy(name, hname, sizeof name);
if (strchr(name, '.') == NULL) {
strncat(name, ".", sizeof name - strlen(name) - 1);
strncat(name, LocalDomain, sizeof name - strlen(name) - 1);
}
dprintf("validate: dgram from IP %s, port %d, name %s;\n",
addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0),
ntohs(sin->sin_port), name);
/* now, walk down the list */
for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) {
dprintf("rejected in rule %d due to port mismatch.\n", i);
continue;
}
if (ap->isnumeric) {
if ((sin->sin_addr.s_addr & ap->a_mask.s_addr)
!= ap->a_addr.s_addr) {
dprintf("rejected in rule %d due to IP mismatch.\n", i);
continue;
}
} else {
cp = ap->a_name;
l1 = strlen(name);
if (*cp == '*') {
/* allow wildmatch */
cp++;
l2 = strlen(cp);
if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
dprintf("rejected in rule %d due to name mismatch.\n", i);
continue;
}
} else {
/* exact match */
l2 = strlen(cp);
if (l2 != l1 || memcmp(cp, name, l1) != 0) {
dprintf("rejected in rule %d due to name mismatch.\n", i);
continue;
}
}
}
dprintf("accepted in rule %d.\n", i);
return 1; /* hooray! */
}
return 0;
}
/*
* Fairly similar to popen(3), but returns an open descriptor, as
* opposed to a FILE *.
*/
int
p_open(prog, pid)
char *prog;
pid_t *pid;
{
int pfd[2], nulldesc, i;
sigset_t omask, mask;
char *argv[4]; /* sh -c cmd NULL */
char errmsg[200];
if (pipe(pfd) == -1)
return -1;
if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
/* we are royally screwed anyway */
return -1;
mask = sigmask(SIGALRM) | sigmask(SIGHUP);
sigprocmask(SIG_BLOCK, &omask, &mask);
switch ((*pid = fork())) {
case -1:
sigprocmask(SIG_SETMASK, 0, &omask);
close(nulldesc);
return -1;
case 0:
argv[0] = "sh";
argv[1] = "-c";
argv[2] = prog;
argv[3] = NULL;
alarm(0);
(void)setsid(); /* Avoid catching SIGHUPs. */
/*
* Throw away pending signals, and reset signal
* behaviour to standard values.
*/
signal(SIGALRM, SIG_IGN);
signal(SIGHUP, SIG_IGN);
sigprocmask(SIG_SETMASK, 0, &omask);
signal(SIGPIPE, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGALRM, SIG_DFL);
signal(SIGHUP, SIG_DFL);
dup2(pfd[0], STDIN_FILENO);
dup2(nulldesc, STDOUT_FILENO);
dup2(nulldesc, STDERR_FILENO);
for (i = getdtablesize(); i > 2; i--)
(void) close(i);
(void) execvp(_PATH_BSHELL, argv);
_exit(255);
}
sigprocmask(SIG_SETMASK, 0, &omask);
close(nulldesc);
close(pfd[0]);
/*
* Avoid blocking on a hung pipe. With O_NONBLOCK, we are
* supposed to get an EWOULDBLOCK on writev(2), which is
* caught by the logic above anyway, which will in turn close
* the pipe, and fork a new logging subprocess if necessary.
* The stale subprocess will be killed some time later unless
* it terminated itself due to closing its input pipe (so we
* get rid of really dead puppies).
*/
if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
/* This is bad. */
(void)snprintf(errmsg, sizeof errmsg,
"Warning: cannot change pipe to PID %d to "
"non-blocking behaviour.",
(int)*pid);
logerror(errmsg);
}
return pfd[1];
}
void
deadq_enter(pid)
pid_t pid;
{
dq_t p;
p = malloc(sizeof(struct deadq_entry));
if (p == 0) {
errno = 0;
logerror("panic: out of virtual memory!");
exit(1);
}
p->dq_pid = pid;
p->dq_timeout = DQ_TIMO_INIT;
TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
}
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