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044354301a
NetBSD/usr.sbin/syslogd/syslogd.c
lukem fdffaa3fe5 Implement -r, which prevents syslogd from compressing multiple messages with 
the same string into "last message repeated N times", and instead forces
syslogd to write out every message.

Based on '-c' in FreeBSD's syslogd, although a different option letter was
chosen because their syslogd requires '-c -c' to get this functionality,
and we don't have the support for logging to pipes which is what FreeBSD's
syslogd with a single '-c' is related to.
2003-10-17 01:39:25 +00:00

1583 lines
36 KiB
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/* $NetBSD: syslogd.c,v 1.63 2003/10/17 01:39:25 lukem Exp $ */
/*
* 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. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__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";
#else
__RCSID("$NetBSD: syslogd.c,v 1.63 2003/10/17 01:39:25 lukem Exp $");
#endif
#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 */
#define TTYMSGTIME 1 /* timeout passed to ttymsg */
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <locale.h>
#include <netdb.h>
#include <poll.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include "utmpentry.h"
#include "pathnames.h"
#define SYSLOG_NAMES
#include <sys/syslog.h>
#ifdef LIBWRAP
#include <tcpd.h>
int allow_severity = LOG_AUTH|LOG_INFO;
int deny_severity = LOG_AUTH|LOG_WARNING;
#endif
char *ConfFile = _PATH_LOGCONF;
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 */
union {
char f_uname[MAXUNAMES][UT_NAMESIZE+1];
struct {
char f_hname[MAXHOSTNAMELEN+1];
struct addrinfo *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 */
int daemonized = 0; /* we are not daemonized yet */
char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */
char *LocalDomain; /* our local domain name */
int *finet = NULL; /* Internet datagram sockets */
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; /* listen only on unix domain socks */
int UseNameService = 1; /* make domain name queries */
int NumForwards = 0; /* number of forwarding actions in conf file */
char **LogPaths; /* array of pathnames to read messages from */
int NoRepeat = 0; /* disable "repeated"; log always */
void cfline(char *, struct filed *);
char *cvthname(struct sockaddr_storage *);
int decode(const char *, CODE *);
void die(int);
void domark(int);
void fprintlog(struct filed *, int, char *);
int getmsgbufsize(void);
int* socksetup(int);
void init(int);
void logerror(const char *, ...);
void logmsg(int, char *, char *, int);
void printline(char *, char *);
void printsys(char *);
void reapchild(int);
void usage(void);
void wallmsg(struct filed *, struct iovec *);
int main(int, char *[]);
void logpath_add(char ***, int *, int *, char *);
void logpath_fileadd(char ***, int *, int *, char *);
int
main(int argc, char *argv[])
{
int ch, *funix, i, j, fklog, len, linesize;
int *nfinetix, nfklogix, nfunixbaseix, nfds;
int funixsize = 0, funixmaxsize = 0;
struct sockaddr_un sunx, fromunix;
struct sockaddr_storage frominet;
char *p, *line, **pp;
struct pollfd *readfds;
uid_t uid = 0;
gid_t gid = 0;
char *user = NULL;
char *group = NULL;
char *root = "/";
char *endp;
struct group *gr;
struct passwd *pw;
unsigned long l;
(void)setlocale(LC_ALL, "");
while ((ch = getopt(argc, argv, "dnsf:m:p:P:ru:g:t:")) != -1)
switch(ch) {
case 'd': /* debug */
Debug++;
break;
case 'f': /* configuration file */
ConfFile = optarg;
break;
case 'g':
group = optarg;
if (*group == '\0')
usage();
break;
case 'm': /* mark interval */
MarkInterval = atoi(optarg) * 60;
break;
case 'n': /* turn off DNS queries */
UseNameService = 0;
break;
case 'p': /* path */
logpath_add(&LogPaths, &funixsize,
&funixmaxsize, optarg);
break;
case 'P': /* file of paths */
logpath_fileadd(&LogPaths, &funixsize,
&funixmaxsize, optarg);
break;
case 'r': /* disable "repeated" compression */
NoRepeat++;
break;
case 's': /* no network listen mode */
SecureMode++;
break;
case 't':
root = optarg;
if (*root == '\0')
usage();
break;
case 'u':
user = optarg;
if (*user == '\0')
usage();
break;
default:
usage();
}
if ((argc -= optind) != 0)
usage();
setlinebuf(stdout);
if (user != NULL) {
if (isdigit((unsigned char)*user)) {
errno = 0;
endp = NULL;
l = strtoul(user, &endp, 0);
if (errno || *endp != '\0')
goto getuser;
uid = (uid_t)l;
if (uid != l) {
errno = 0;
logerror("UID out of range");
die(0);
}
} else {
getuser:
if ((pw = getpwnam(user)) != NULL) {
uid = pw->pw_uid;
} else {
errno = 0;
logerror("Cannot find user `%s'", user);
die (0);
}
}
}
if (group != NULL) {
if (isdigit((unsigned char)*group)) {
errno = 0;
endp = NULL;
l = strtoul(group, &endp, 0);
if (errno || *endp != '\0')
goto getgroup;
gid = (gid_t)l;
if (gid != l) {
errno = 0;
logerror("GID out of range");
die(0);
}
} else {
getgroup:
if ((gr = getgrnam(group)) != NULL) {
gid = gr->gr_gid;
} else {
errno = 0;
logerror("Cannot find group `%s'", group);
die(0);
}
}
}
if (access (root, F_OK | R_OK)) {
logerror("Cannot access `%s'", root);
die (0);
}
consfile.f_type = F_CONSOLE;
(void)strlcpy(consfile.f_un.f_fname, ctty,
sizeof(consfile.f_un.f_fname));
(void)gethostname(LocalHostName, sizeof(LocalHostName));
LocalHostName[sizeof(LocalHostName) - 1] = '\0';
if ((p = strchr(LocalHostName, '.')) != NULL) {
*p++ = '\0';
LocalDomain = p;
} else
LocalDomain = "";
linesize = getmsgbufsize();
if (linesize < MAXLINE)
linesize = MAXLINE;
linesize++;
line = malloc(linesize);
if (line == NULL) {
logerror("Couldn't allocate line buffer");
die(0);
}
(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)alarm(TIMERINTVL);
#ifndef SUN_LEN
#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
#endif
if (funixsize == 0)
logpath_add(&LogPaths, &funixsize,
&funixmaxsize, _PATH_LOG);
funix = (int *)malloc(sizeof(int) * funixsize);
if (funix == NULL) {
logerror("Couldn't allocate funix descriptors");
die(0);
}
for (j = 0, pp = LogPaths; *pp; pp++, j++) {
dprintf("Making unix dgram socket `%s'\n", *pp);
unlink(*pp);
memset(&sunx, 0, sizeof(sunx));
sunx.sun_family = AF_LOCAL;
(void)strncpy(sunx.sun_path, *pp, sizeof(sunx.sun_path));
funix[j] = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (funix[j] < 0 || bind(funix[j],
(struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
chmod(*pp, 0666) < 0) {
logerror("Cannot create `%s'", *pp);
die(0);
}
dprintf("Listening on unix dgram socket `%s'\n", *pp);
}
init(0);
if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) < 0) {
dprintf("Can't open `%s' (%d)\n", _PATH_KLOG, errno);
} else {
dprintf("Listening on kernel log `%s'\n", _PATH_KLOG);
}
dprintf("Off & running....\n");
(void)signal(SIGHUP, init);
/* setup pollfd set. */
readfds = (struct pollfd *)malloc(sizeof(struct pollfd) *
(funixsize + (finet ? *finet : 0) + 1));
if (readfds == NULL) {
logerror("Couldn't allocate pollfds");
die(0);
}
nfds = 0;
if (fklog >= 0) {
nfklogix = nfds++;
readfds[nfklogix].fd = fklog;
readfds[nfklogix].events = POLLIN | POLLPRI;
}
if (finet && !SecureMode) {
nfinetix = malloc(*finet * sizeof(*nfinetix));
for (j = 0; j < *finet; j++) {
nfinetix[j] = nfds++;
readfds[nfinetix[j]].fd = finet[j+1];
readfds[nfinetix[j]].events = POLLIN | POLLPRI;
}
}
nfunixbaseix = nfds;
for (j = 0, pp = LogPaths; *pp; pp++) {
readfds[nfds].fd = funix[j++];
readfds[nfds++].events = POLLIN | POLLPRI;
}
/*
* All files are open, we can drop privileges and chroot
*/
dprintf("Attempt to chroot to `%s'\n", root);
if (chroot(root)) {
logerror("Failed to chroot to `%s'", root);
die(0);
}
dprintf("Attempt to set GID/EGID to `%d'\n", gid);
if (setgid(gid) || setegid(gid)) {
logerror("Failed to set gid to `%d'", gid);
die(0);
}
dprintf("Attempt to set UID/EUID to `%d'\n", uid);
if (setuid(uid) || seteuid(uid)) {
logerror("Failed to set uid to `%d'", uid);
die(0);
}
/*
* We cannot detach from the terminal before we are sure we won't
* have a fatal error, because error message would not go to the
* terminal and would not be logged because syslogd dies.
* All die() calls are behind us, we can call daemon()
*/
if (!Debug) {
(void)daemon(0, 0);
daemonized = 1;
/* tuck my process id away, if i'm not in debug mode */
pidfile(NULL);
}
for (;;) {
int rv;
rv = poll(readfds, nfds, INFTIM);
if (rv == 0)
continue;
if (rv < 0) {
if (errno != EINTR)
logerror("poll() failed");
continue;
}
dprintf("Got a message (%d)\n", rv);
if (fklog >= 0 &&
(readfds[nfklogix].revents & (POLLIN | POLLPRI))) {
dprintf("Kernel log active\n");
i = read(fklog, line, linesize - 1);
if (i > 0) {
line[i] = '\0';
printsys(line);
} else if (i < 0 && errno != EINTR) {
logerror("klog failed");
fklog = -1;
}
}
for (j = 0, pp = LogPaths; *pp; pp++, j++) {
if ((readfds[nfunixbaseix + j].revents &
(POLLIN | POLLPRI)) == 0)
continue;
dprintf("Unix socket (%s) active\n", *pp);
len = sizeof(fromunix);
i = recvfrom(funix[j], 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 `%s'", *pp);
}
}
if (finet && !SecureMode) {
for (j = 0; j < *finet; j++) {
if (readfds[nfinetix[j]].revents &
(POLLIN | POLLPRI)) {
#ifdef LIBWRAP
struct request_info req;
#endif
int reject = 0;
dprintf("inet socket active\n");
#ifdef LIBWRAP
request_init(&req, RQ_DAEMON, "syslogd",
RQ_FILE, finet[j + 1], NULL);
fromhost(&req);
reject = !hosts_access(&req);
if (reject)
dprintf("access denied\n");
#endif
len = sizeof(frominet);
i = recvfrom(finet[j+1], line, MAXLINE,
0, (struct sockaddr *)&frominet,
&len);
if (i == 0 || (i < 0 && errno == EINTR))
continue;
else if (i < 0) {
logerror("recvfrom inet");
continue;
}
line[i] = '\0';
if (!reject)
printline(cvthname(&frominet),
line);
}
}
}
}
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: %s [-dnrs] [-f config_file] [-g group] [-m mark_interval]\n"
"\t[-P file_list] [-p log_socket [-p log_socket2 ...]]\n"
"\t[-t chroot_dir] [-u user]\n", getprogname());
exit(1);
}
/*
* given a pointer to an array of char *'s, a pointer to it's current
* size and current allocated max size, and a new char * to add, add
* it, update everything as necessary, possibly allocating a new array
*/
void
logpath_add(char ***lp, int *szp, int *maxszp, char *new)
{
char **nlp;
int newmaxsz;
dprintf("Adding `%s' to the %p logpath list\n", new, *lp);
if (*szp == *maxszp) {
if (*maxszp == 0) {
newmaxsz = 4; /* start of with enough for now */
*lp = NULL;
} else
newmaxsz = *maxszp * 2;
nlp = realloc(*lp, sizeof(char *) * (newmaxsz + 1));
if (nlp == NULL) {
logerror("Couldn't allocate line buffer");
die(0);
}
*lp = nlp;
*maxszp = newmaxsz;
}
if (((*lp)[(*szp)++] = strdup(new)) == NULL) {
logerror("Couldn't allocate logpath");
die(0);
}
(*lp)[(*szp)] = NULL; /* always keep it NULL terminated */
}
/* do a file of log sockets */
void
logpath_fileadd(char ***lp, int *szp, int *maxszp, char *file)
{
FILE *fp;
char *line;
size_t len;
fp = fopen(file, "r");
if (fp == NULL) {
logerror("Could not open socket file list `%s'", file);
die(0);
}
while ((line = fgetln(fp, &len))) {
line[len - 1] = 0;
logpath_add(lp, szp, maxszp, line);
}
fclose(fp);
}
/*
* Take a raw input line, decode the message, and print the message
* on the appropriate log files.
*/
void
printline(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++) != '\0' &&
q < &line[sizeof(line) - 2]) {
c &= 0177;
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(char *msg)
{
int c, pri, flags;
char *lp, *p, *q, line[MAXLINE + 1];
(void)strlcpy(line, _PATH_UNIX, sizeof(line));
(void)strlcat(line, ": ", sizeof(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(int pri, char *msg, char *from, int flags)
{
struct filed *f;
int fac, msglen, omask, prilev;
char *timestamp;
dprintf("logmsg: pri 0%o, flags 0x%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;
}
/* 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_next) {
/* skip messages that are incorrect priority */
if (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 unless NoRepeat
*/
if ((flags & MARK) == 0 && msglen == f->f_prevlen &&
!NoRepeat &&
!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, (long)(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)strlcpy(f->f_prevline, msg,
sizeof(f->f_prevline));
fprintlog(f, flags, (char *)NULL);
} else {
f->f_prevline[0] = 0;
f->f_prevlen = 0;
fprintlog(f, flags, msg);
}
}
}
(void)sigsetmask(omask);
}
void
fprintlog(struct filed *f, int flags, char *msg)
{
struct iovec iov[6];
struct iovec *v;
struct addrinfo *r;
int j, l, lsent;
char line[MAXLINE + 1], repbuf[80], greetings[200];
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 = snprintf(repbuf, sizeof 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);
/*
* check for local vs remote messages
* (from FreeBSD PR#bin/7055)
*/
if (strcmp(f->f_prevhost, LocalHostName)) {
l = snprintf(line, sizeof(line) - 1,
"<%d>%.15s [%s]: %s",
f->f_prevpri, (char *) iov[0].iov_base,
f->f_prevhost, (char *) iov[4].iov_base);
} else {
l = snprintf(line, sizeof(line) - 1, "<%d>%.15s %s",
f->f_prevpri, (char *) iov[0].iov_base,
(char *) iov[4].iov_base);
}
if (l > MAXLINE)
l = MAXLINE;
if (finet) {
for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
for (j = 0; j < *finet; j++) {
#if 0
/*
* should we check AF first, or just
* trial and error? FWD
*/
if (r->ai_family ==
address_family_of(finet[j+1]))
#endif
lsent = sendto(finet[j+1], line, l, 0,
r->ai_addr, r->ai_addrlen);
if (lsent == l)
break;
}
}
if (lsent != l) {
f->f_type = F_UNUSED;
logerror("sendto() failed");
}
}
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.
*/
void
wallmsg(struct filed *f, struct iovec *iov)
{
static int reenter; /* avoid calling ourselves */
int i;
char *p;
static struct utmpentry *ohead = NULL;
struct utmpentry *ep;
if (reenter++)
return;
(void)getutentries(NULL, &ep);
if (ep != ohead) {
freeutentries(ohead);
ohead = ep;
}
/* NOSTRICT */
for (; ep; ep = ep->next) {
if (f->f_type == F_WALL) {
if ((p = ttymsg(iov, 6, ep->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 (strcmp(f->f_un.f_uname[i], ep->name) == 0) {
if ((p = ttymsg(iov, 6, ep->line, TTYMSGTIME))
!= NULL) {
errno = 0; /* already in msg */
logerror(p);
}
break;
}
}
}
reenter = 0;
}
void
reapchild(int signo)
{
union wait status;
while (wait3((int *)&status, WNOHANG, (struct rusage *)NULL) > 0)
;
}
/*
* Return a printable representation of a host address.
*/
char *
cvthname(struct sockaddr_storage *f)
{
int error;
char *p;
const int niflag = NI_DGRAM;
static char host[NI_MAXHOST], ip[NI_MAXHOST];
error = getnameinfo((struct sockaddr*)f, ((struct sockaddr*)f)->sa_len,
ip, sizeof ip, NULL, 0, NI_NUMERICHOST|niflag);
dprintf("cvthname(%s)\n", ip);
if (error) {
dprintf("Malformed from address %s\n", gai_strerror(error));
return ("???");
}
if (!UseNameService)
return (ip);
error = getnameinfo((struct sockaddr*)f, ((struct sockaddr*)f)->sa_len,
host, sizeof host, NULL, 0, niflag);
if (error) {
dprintf("Host name for your address (%s) unknown\n", ip);
return (ip);
}
if ((p = strchr(host, '.')) && strcmp(p + 1, LocalDomain) == 0)
*p = '\0';
return (host);
}
void
domark(int signo)
{
struct filed *f;
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);
}
}
(void)alarm(TIMERINTVL);
}
/*
* Print syslogd errors some place.
*/
void
logerror(const char *fmt, ...)
{
va_list ap;
char tmpbuf[BUFSIZ];
char buf[BUFSIZ];
va_start(ap, fmt);
(void)vsnprintf(tmpbuf, sizeof(tmpbuf), fmt, ap);
va_end(ap);
if (errno)
(void)snprintf(buf, sizeof(buf), "syslogd: %s: %s",
tmpbuf, strerror(errno));
else
(void)snprintf(buf, sizeof(buf), "syslogd: %s", tmpbuf);
if (daemonized)
logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
if (!daemonized && Debug)
dprintf("%s\n", buf);
if (!daemonized && !Debug)
printf("%s\n", buf);
return;
}
void
die(int signo)
{
struct filed *f;
char **p;
for (f = Files; f != NULL; f = f->f_next) {
/* flush any pending output */
if (f->f_prevcount)
fprintlog(f, 0, (char *)NULL);
}
errno = 0;
if (signo)
logerror("Exiting on signal %d", signo);
else
logerror("Fatal error, exiting");
for (p = LogPaths; p && *p; p++)
unlink(*p);
exit(0);
}
/*
* INIT -- Initialize syslogd from configuration table
*/
void
init(int signo)
{
int i;
FILE *cf;
struct filed *f, *next, **nextp;
char *p;
char cline[LINE_MAX];
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:
(void)close(f->f_file);
break;
case F_FORW:
if (f->f_un.f_forw.f_addr)
freeaddrinfo(f->f_un.f_forw.f_addr);
break;
}
next = f->f_next;
free((char *)f);
}
Files = NULL;
nextp = &Files;
/*
* Close all open sockets
*/
if (finet) {
for (i = 0; i < *finet; i++) {
if (close(finet[i+1]) < 0) {
logerror("close() failed");
die(0);
}
}
}
/*
* Reset counter of forwarding actions
*/
NumForwards=0;
/* 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;
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)
continue;
if (*p == '\0' || *p == '#')
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);
}
/* 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:
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");
}
}
finet = socksetup(PF_UNSPEC);
if (finet) {
if (SecureMode) {
for (i = 0; i < *finet; i++) {
if (shutdown(finet[i+1], SHUT_RD) < 0) {
logerror("shutdown() failed");
die(0);
}
}
} else
dprintf("Listening on inet and/or inet6 socket\n");
dprintf("Sending on inet and/or inet6 socket\n");
}
logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
dprintf("syslogd: restarted\n");
}
/*
* Crack a configuration file line
*/
void
cfline(char *line, struct filed *f)
{
struct addrinfo hints, *res;
int error, i, pri;
char *bp, *p, *q;
char buf[MAXLINE];
int sp_err;
dprintf("cfline(%s)\n", line);
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;
/*
* There should not be any space before the log facility.
* Check this is okay, complain and fix if it is not.
*/
q = line;
if (isblank((unsigned char)*line)) {
errno = 0;
logerror(
"Warning: `%s' space or tab before the log facility",
line);
/* Fix: strip all spaces/tabs before the log facility */
while (*q++ && isblank((unsigned char)*q));
line = q;
}
/*
* q is now at the first char of the log facility
* There should be at least one tab after the log facility
* Check this is okay, and complain and fix if it is not.
*/
q = line + strlen(line);
while (!isblank((unsigned char)*q) && (q != line))
q--;
if ((q == line) && strlen(line)) {
/* No tabs or space in a non empty line: complain */
errno = 0;
logerror(
"Error: `%s' log facility or log target missing",
line);
}
/* q is at the end of the blank between the two fields */
sp_err = 0;
while (isblank((unsigned char)*q) && (q != line))
if (*q-- == ' ')
sp_err = 1;
if (sp_err) {
/*
* A space somewhere between the log facility
* and the log target: complain
*/
errno = 0;
logerror(
"Warning: `%s' space found where tab is expected",
line);
/* ... and fix the problem: replace all spaces by tabs */
while (*++q && isblank((unsigned char)*q))
if (*q == ' ')
*q='\t';
}
/* 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) {
errno = 0;
logerror("Unknown priority name `%s'", buf);
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) {
errno = 0;
logerror("Unknown facility name `%s'",
buf);
return;
}
f->f_pmask[i >> 3] = pri;
}
while (*p == ',' || *p == ' ')
p++;
}
p = q;
}
/* skip to action part */
sp_err = 0;
while ((*p == '\t') || (*p == ' '))
p++;
switch (*p)
{
case '@':
(void)strlcpy(f->f_un.f_forw.f_hname, ++p,
sizeof(f->f_un.f_forw.f_hname));
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = 0;
error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints,
&res);
if (error) {
logerror(gai_strerror(error));
break;
}
f->f_un.f_forw.f_addr = res;
f->f_type = F_FORW;
NumForwards++;
break;
case '/':
(void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
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))
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
*/
int
decode(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);
}
/*
* Retrieve the size of the kernel message buffer, via sysctl.
*/
int
getmsgbufsize(void)
{
int msgbufsize, mib[2];
size_t size;
mib[0] = CTL_KERN;
mib[1] = KERN_MSGBUFSIZE;
size = sizeof msgbufsize;
if (sysctl(mib, 2, &msgbufsize, &size, NULL, 0) == -1) {
dprintf("Couldn't get kern.msgbufsize\n");
return (0);
}
return (msgbufsize);
}
int *
socksetup(int af)
{
struct addrinfo hints, *res, *r;
int error, maxs, *s, *socks;
const int on = 1;
if(SecureMode && !NumForwards)
return(NULL);
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_family = af;
hints.ai_socktype = SOCK_DGRAM;
error = getaddrinfo(NULL, "syslog", &hints, &res);
if (error) {
logerror(gai_strerror(error));
errno = 0;
die(0);
}
/* Count max number of sockets we may open */
for (maxs = 0, r = res; r; r = r->ai_next, maxs++)
continue;
socks = malloc((maxs+1) * sizeof(int));
if (!socks) {
logerror("Couldn't allocate memory for sockets");
die(0);
}
*socks = 0; /* num of sockets counter at start of array */
s = socks + 1;
for (r = res; r; r = r->ai_next) {
*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
if (*s < 0) {
logerror("socket() failed");
continue;
}
if (r->ai_family == AF_INET6 && setsockopt(*s, IPPROTO_IPV6,
IPV6_V6ONLY, &on, sizeof(on)) < 0) {
logerror("setsockopt(IPV6_V6ONLY) failed");
close(*s);
continue;
}
if (!SecureMode && bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
logerror("bind() failed");
close (*s);
continue;
}
*socks = *socks + 1;
s++;
}
if (*socks == 0) {
free (socks);
if(Debug)
return(NULL);
else
die(0);
}
if (res)
freeaddrinfo(res);
return(socks);
}
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