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d6c85264cd
freebsd/usr.sbin/syslogd/syslogd.c
Giorgos Keramidas d6c85264cd Fix a minor comment typo: priveleged = privileged.
2004-11-18 12:20:52 +00:00

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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.
* 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
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* syslogd -- log system messages
*
* This program implements a system log. It takes a series of lines.
* Each line may have a priority, signified as "<n>" as
* the first characters of the line. If this is
* not present, a default priority is used.
*
* To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will
* cause it to reread its configuration file.
*
* Defined Constants:
*
* MAXLINE -- the maximum line length that can be handled.
* DEFUPRI -- the default priority for user messages
* DEFSPRI -- the default priority for kernel messages
*
* Author: Eric Allman
* extensive changes by Ralph Campbell
* more extensive changes by Eric Allman (again)
* Extension to log by program name as well as facility and priority
* by Peter da Silva.
* -u and -v by Harlan Stenn.
* Priority comparison code by Harlan Stenn.
*/
#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/ioctl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/socket.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 <sys/types.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 <libutil.h>
#include <limits.h>
#include <paths.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"
#include "ttymsg.h"
#define SYSLOG_NAMES
#include <sys/syslog.h>
#ifdef NI_WITHSCOPEID
static const int withscopeid = NI_WITHSCOPEID;
#else
static const int withscopeid;
#endif
const char *ConfFile = _PATH_LOGCONF;
const char *PidFile = _PATH_LOGPID;
const char ctty[] = _PATH_CONSOLE;
#define dprintf if (Debug) printf
#define MAXUNAMES 20 /* maximum number of user names */
/*
* Unix sockets.
* We have two default sockets, one with 666 permissions,
* and one for privileged programs.
*/
struct funix {
int s;
char *name;
mode_t mode;
STAILQ_ENTRY(funix) next;
};
struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
{ NULL } };
struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE,
{ &funix_secure } };
STAILQ_HEAD(, funix) funixes = { &funix_default,
&(funix_secure.next.stqe_next) };
/*
* 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 */
#define ISKERNEL 0x010 /* kernel generated message */
/*
* This structure represents the files that will have log
* copies printed.
* We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
* or if f_type if F_PIPE and f_pid > 0.
*/
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 */
char *f_host; /* host from which to recd. */
u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */
u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */
#define PRI_LT 0x1
#define PRI_EQ 0x2
#define PRI_GT 0x4
char *f_program; /* program this applies to */
union {
char f_uname[MAXUNAMES][UT_NAMESIZE+1];
struct {
char f_hname[MAXHOSTNAMELEN];
struct addrinfo *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]; /* 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 */
u_int f_repeatcount; /* number of "repeated" msgs */
int f_flags; /* file-specific flags */
#define FFLAG_SYNC 0x01
#define FFLAG_NEEDSYNC 0x02
};
/*
* 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 sockaddr_storage addr;
struct sockaddr_storage 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 */
const char *TypeNames[8] = {
"UNUSED", "FILE", "TTY", "CONSOLE",
"FORW", "USERS", "WALL", "PIPE"
};
static struct filed *Files; /* Log files that we write to */
static struct filed consfile; /* Console */
static int Debug; /* debug flag */
static int resolve = 1; /* resolve hostname */
static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */
static const char *LocalDomain; /* our local domain name */
static int *finet; /* Internet datagram socket */
static int fklog = -1; /* /dev/klog */
static int Initialized; /* set when we have initialized ourselves */
static int MarkInterval = 20 * 60; /* interval between marks in seconds */
static int MarkSeq; /* mark sequence number */
static int SecureMode; /* when true, receive only unix domain socks */
#ifdef INET6
static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
#else
static int family = PF_INET; /* protocol family (IPv4 only) */
#endif
static int send_to_all; /* send message to all IPv4/IPv6 addresses */
static int use_bootfile; /* log entire bootfile for every kern msg */
static int no_compress; /* don't compress messages (1=pipes, 2=all) */
static char bootfile[MAXLINE+1]; /* booted kernel file */
struct allowedpeer *AllowedPeers; /* List of allowed peers */
static int NumAllowed; /* Number of entries in AllowedPeers */
static int UniquePriority; /* Only log specified priority? */
static int LogFacPri; /* Put facility and priority in log message: */
/* 0=no, 1=numeric, 2=names */
static int KeepKernFac; /* Keep remotely logged kernel facility */
static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
volatile sig_atomic_t MarkSet, WantDie;
static int allowaddr(char *);
static void cfline(const char *, struct filed *,
const char *, const char *);
static const char *cvthname(struct sockaddr *);
static void deadq_enter(pid_t, const char *);
static int deadq_remove(pid_t);
static int decode(const char *, CODE *);
static void die(int);
static void dodie(int);
static void dofsync(void);
static void domark(int);
static void fprintlog(struct filed *, int, const char *);
static int *socksetup(int, const char *);
static void init(int);
static void logerror(const char *);
static void logmsg(int, const char *, const char *, int);
static void log_deadchild(pid_t, int, const char *);
static void markit(void);
static int skip_message(const char *, const char *, int);
static void printline(const char *, char *);
static void printsys(char *);
static int p_open(const char *, pid_t *);
static void readklog(void);
static void reapchild(int);
static void usage(void);
static int validate(struct sockaddr *, const char *);
static void unmapped(struct sockaddr *);
static void wallmsg(struct filed *, struct iovec *);
static int waitdaemon(int, int, int);
static void timedout(int);
static void double_rbuf(int);
int
main(int argc, char *argv[])
{
int ch, i, fdsrmax = 0, l;
struct sockaddr_un sunx, fromunix;
struct sockaddr_storage frominet;
fd_set *fdsr = NULL;
FILE *fp;
char line[MAXLINE + 1];
const char *bindhostname, *hname;
struct timeval tv, *tvp;
struct sigaction sact;
struct funix *fx, *fx1;
sigset_t mask;
pid_t ppid = 1;
socklen_t len;
bindhostname = NULL;
while ((ch = getopt(argc, argv, "46Aa:b:cdf:kl:m:nop:P:suv")) != -1)
switch (ch) {
case '4':
family = PF_INET;
break;
#ifdef INET6
case '6':
family = PF_INET6;
break;
#endif
case 'A':
send_to_all++;
break;
case 'a': /* allow specific network addresses only */
if (allowaddr(optarg) == -1)
usage();
break;
case 'b':
bindhostname = optarg;
break;
case 'c':
no_compress++;
break;
case 'd': /* debug */
Debug++;
break;
case 'f': /* configuration file */
ConfFile = optarg;
break;
case 'k': /* keep remote kern fac */
KeepKernFac = 1;
break;
case 'l':
{
long perml;
mode_t mode;
char *name, *ep;
if (optarg[0] == '/') {
mode = DEFFILEMODE;
name = optarg;
} else if ((name = strchr(optarg, ':')) != NULL) {
*name++ = '\0';
if (name[0] != '/')
errx(1, "socket name must be absolute "
"path");
if (isdigit(*optarg)) {
perml = strtol(optarg, &ep, 8);
if (*ep || perml < 0 ||
perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
errx(1, "invalid mode %s, exiting",
optarg);
mode = (mode_t )perml;
} else
errx(1, "invalid mode %s, exiting",
optarg);
} else /* doesn't begin with '/', and no ':' */
errx(1, "can't parse path %s", optarg);
if (strlen(name) >= sizeof(sunx.sun_path))
errx(1, "%s path too long, exiting", name);
if ((fx = malloc(sizeof(struct funix))) == NULL)
errx(1, "malloc failed");
fx->s = -1;
fx->name = name;
fx->mode = mode;
STAILQ_INSERT_TAIL(&funixes, fx, next);
break;
}
case 'm': /* mark interval */
MarkInterval = atoi(optarg) * 60;
break;
case 'n':
resolve = 0;
break;
case 'o':
use_bootfile = 1;
break;
case 'p': /* path */
if (strlen(optarg) >= sizeof(sunx.sun_path))
errx(1, "%s path too long, exiting", optarg);
funix_default.name = optarg;
break;
case 'P': /* path for alt. PID */
PidFile = optarg;
break;
case 's': /* no network mode */
SecureMode++;
break;
case 'u': /* only log specified priority */
UniquePriority++;
break;
case 'v': /* log facility and priority */
LogFacPri++;
break;
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)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
sizeof(consfile.f_un.f_fname));
(void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
(void)signal(SIGTERM, dodie);
(void)signal(SIGINT, Debug ? dodie : SIG_IGN);
(void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
/*
* We don't want the SIGCHLD and SIGHUP handlers to interfere
* with each other; they are likely candidates for being called
* simultaneously (SIGHUP closes pipe descriptor, process dies,
* SIGCHLD happens).
*/
sigemptyset(&mask);
sigaddset(&mask, SIGHUP);
sact.sa_handler = reapchild;
sact.sa_mask = mask;
sact.sa_flags = SA_RESTART;
(void)sigaction(SIGCHLD, &sact, NULL);
(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
STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) {
(void)unlink(fx->name);
memset(&sunx, 0, sizeof(sunx));
sunx.sun_family = AF_UNIX;
(void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path));
fx->s = socket(AF_UNIX, SOCK_DGRAM, 0);
if (fx->s < 0 ||
bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
chmod(fx->name, fx->mode) < 0) {
(void)snprintf(line, sizeof line,
"cannot create %s", fx->name);
logerror(line);
dprintf("cannot create %s (%d)\n", fx->name, errno);
if (fx == &funix_default || fx == &funix_secure)
die(0);
else {
STAILQ_REMOVE(&funixes, fx, funix, next);
continue;
}
double_rbuf(fx->s);
}
}
if (SecureMode <= 1)
finet = socksetup(family, bindhostname);
if (finet) {
if (SecureMode) {
for (i = 0; i < *finet; i++) {
if (shutdown(finet[i+1], SHUT_RD) < 0) {
logerror("shutdown");
if (!Debug)
die(0);
}
}
} else {
dprintf("listening on inet and/or inet6 socket\n");
}
dprintf("sending on inet and/or inet6 socket\n");
}
if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
fklog = -1;
if (fklog < 0)
dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
/* 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);
/* prevent SIGHUP and SIGCHLD handlers from running in parallel */
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sact.sa_handler = init;
sact.sa_mask = mask;
sact.sa_flags = SA_RESTART;
(void)sigaction(SIGHUP, &sact, NULL);
tvp = &tv;
tv.tv_sec = tv.tv_usec = 0;
if (fklog != -1 && fklog > fdsrmax)
fdsrmax = fklog;
if (finet && !SecureMode) {
for (i = 0; i < *finet; i++) {
if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
fdsrmax = finet[i+1];
}
}
STAILQ_FOREACH(fx, &funixes, next)
if (fx->s > fdsrmax)
fdsrmax = fx->s;
fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
sizeof(fd_mask));
if (fdsr == NULL)
errx(1, "calloc fd_set");
for (;;) {
if (MarkSet)
markit();
if (WantDie)
die(WantDie);
bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
sizeof(fd_mask));
if (fklog != -1)
FD_SET(fklog, fdsr);
if (finet && !SecureMode) {
for (i = 0; i < *finet; i++) {
if (finet[i+1] != -1)
FD_SET(finet[i+1], fdsr);
}
}
STAILQ_FOREACH(fx, &funixes, next)
FD_SET(fx->s, fdsr);
i = select(fdsrmax+1, fdsr, NULL, NULL,
needdofsync ? &tv : tvp);
switch (i) {
case 0:
dofsync();
needdofsync = 0;
if (tvp) {
tvp = NULL;
if (ppid != 1)
kill(ppid, SIGALRM);
}
continue;
case -1:
if (errno != EINTR)
logerror("select");
continue;
}
if (fklog != -1 && FD_ISSET(fklog, fdsr))
readklog();
if (finet && !SecureMode) {
for (i = 0; i < *finet; i++) {
if (FD_ISSET(finet[i+1], fdsr)) {
len = sizeof(frominet);
l = recvfrom(finet[i+1], line, MAXLINE,
0, (struct sockaddr *)&frominet,
&len);
if (l > 0) {
line[l] = '\0';
hname = cvthname((struct sockaddr *)&frominet);
unmapped((struct sockaddr *)&frominet);
if (validate((struct sockaddr *)&frominet, hname))
printline(hname, line);
} else if (l < 0 && errno != EINTR)
logerror("recvfrom inet");
}
}
}
STAILQ_FOREACH(fx, &funixes, next) {
if (FD_ISSET(fx->s, fdsr)) {
len = sizeof(fromunix);
l = recvfrom(fx->s, line, MAXLINE, 0,
(struct sockaddr *)&fromunix, &len);
if (l > 0) {
line[l] = '\0';
printline(LocalHostName, line);
} else if (l < 0 && errno != EINTR)
logerror("recvfrom unix");
}
}
}
if (fdsr)
free(fdsr);
}
static void
unmapped(struct sockaddr *sa)
{
struct sockaddr_in6 *sin6;
struct sockaddr_in sin4;
if (sa->sa_family != AF_INET6)
return;
if (sa->sa_len != sizeof(struct sockaddr_in6) ||
sizeof(sin4) > sa->sa_len)
return;
sin6 = (struct sockaddr_in6 *)sa;
if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
return;
memset(&sin4, 0, sizeof(sin4));
sin4.sin_family = AF_INET;
sin4.sin_len = sizeof(struct sockaddr_in);
memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
sizeof(sin4.sin_addr));
sin4.sin_port = sin6->sin6_port;
memcpy(sa, &sin4, sin4.sin_len);
}
static void
usage(void)
{
fprintf(stderr, "%s\n%s\n%s\n%s\n",
"usage: syslogd [-46Acdknosuv] [-a allowed_peer]",
" [-b bind address] [-f config_file]",
" [-l log_socket] [-m mark_interval]",
" [-P pid_file] [-p log_socket]");
exit(1);
}
/*
* Take a raw input line, decode the message, and print the message
* on the appropriate log files.
*/
static void
printline(const char *hname, char *msg)
{
char *p, *q;
long n;
int c, pri;
char line[MAXLINE + 1];
/* test for special codes */
p = msg;
pri = DEFUPRI;
if (*p == '<') {
errno = 0;
n = strtol(p + 1, &q, 10);
if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
p = q + 1;
pri = n;
}
}
if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
pri = DEFUPRI;
/*
* Don't allow users to log kernel messages.
* NOTE: since LOG_KERN == 0 this will also match
* messages with no facility specified.
*/
if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
q = line;
while ((c = (unsigned char)*p++) != '\0' &&
q < &line[sizeof(line) - 4]) {
if ((c & 0x80) && c < 0xA0) {
c &= 0x7F;
*q++ = 'M';
*q++ = '-';
}
if (isascii(c) && 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);
}
/*
* Read /dev/klog while data are available, split into lines.
*/
static void
readklog(void)
{
char *p, *q, line[MAXLINE + 1];
int len, i;
len = 0;
for (;;) {
i = read(fklog, line + len, MAXLINE - 1 - len);
if (i > 0) {
line[i + len] = '\0';
} else {
if (i < 0 && errno != EINTR && errno != EAGAIN) {
logerror("klog");
fklog = -1;
}
break;
}
for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
*q = '\0';
printsys(p);
}
len = strlen(p);
if (len >= MAXLINE - 1) {
printsys(p);
len = 0;
}
if (len > 0)
memmove(line, p, len + 1);
}
if (len > 0)
printsys(line);
}
/*
* Take a raw input line from /dev/klog, format similar to syslog().
*/
static void
printsys(char *msg)
{
char *p, *q;
long n;
int flags, isprintf, pri;
flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */
p = msg;
pri = DEFSPRI;
isprintf = 1;
if (*p == '<') {
errno = 0;
n = strtol(p + 1, &q, 10);
if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
p = q + 1;
pri = n;
isprintf = 0;
}
}
/*
* Kernel printf's and LOG_CONSOLE messages have been displayed
* on the console already.
*/
if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
flags |= IGN_CONS;
if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
pri = DEFSPRI;
logmsg(pri, p, LocalHostName, flags);
}
static time_t now;
/*
* Match a program or host name against a specification.
* Return a non-0 value if the message must be ignored
* based on the specification.
*/
static int
skip_message(const char *name, const char *spec, int checkcase) {
const char *s;
char prev, next;
int exclude = 0;
/* Behaviour on explicit match */
if (spec == NULL)
return 0;
switch (*spec) {
case '-':
exclude = 1;
/*FALLTHROUGH*/
case '+':
spec++;
break;
default:
break;
}
if (checkcase)
s = strstr (spec, name);
else
s = strcasestr (spec, name);
if (s != NULL) {
prev = (s == spec ? ',' : *(s - 1));
next = *(s + strlen (name));
if (prev == ',' && (next == '\0' || next == ','))
/* Explicit match: skip iff the spec is an
exclusive one. */
return exclude;
}
/* No explicit match for this name: skip the message iff
the spec is an inclusive one. */
return !exclude;
}
/*
* Log a message to the appropriate log files, users, etc. based on
* the priority.
*/
static void
logmsg(int pri, const char *msg, const char *from, int flags)
{
struct filed *f;
int i, fac, msglen, omask, prilev;
const char *timestamp;
char prog[NAME_MAX+1];
char buf[MAXLINE+1];
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 (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
msg[i] == '/')
break;
prog[i] = msg[i];
}
prog[i] = 0;
/* add kernel prefix for kernel messages */
if (flags & ISKERNEL) {
snprintf(buf, sizeof(buf), "%s: %s",
use_bootfile ? bootfile : "kernel", msg);
msg = buf;
msglen = strlen(buf);
}
/* log the message to the particular outputs */
if (!Initialized) {
f = &consfile;
f->f_file = open(ctty, O_WRONLY, 0);
if (f->f_file >= 0) {
(void)strlcpy(f->f_lasttime, timestamp,
sizeof(f->f_lasttime));
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_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
)
|| f->f_pmask[fac] == INTERNAL_NOPRI)
continue;
/* skip messages with the incorrect hostname */
if (skip_message(from, f->f_host, 0))
continue;
/* skip messages with the incorrect program name */
if (skip_message(prog, f->f_program, 1))
continue;
/* skip message to console if it has already been printed */
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 (no_compress - (f->f_type != F_PIPE) < 1 &&
(flags & MARK) == 0 && msglen == f->f_prevlen &&
!strcmp(msg, f->f_prevline) &&
!strcasecmp(from, f->f_prevhost)) {
(void)strlcpy(f->f_lasttime, timestamp,
sizeof(f->f_lasttime));
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)strlcpy(f->f_lasttime, timestamp,
sizeof(f->f_lasttime));
(void)strlcpy(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);
}
static void
dofsync(void)
{
struct filed *f;
for (f = Files; f; f = f->f_next) {
if ((f->f_type == F_FILE) &&
(f->f_flags & FFLAG_NEEDSYNC)) {
f->f_flags &= ~FFLAG_NEEDSYNC;
(void)fsync(f->f_file);
}
}
}
static void
fprintlog(struct filed *f, int flags, const char *msg)
{
struct iovec iov[7];
struct iovec *v;
struct addrinfo *r;
int i, l, lsent = 0;
char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
const 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));
if (v->iov_len > 0)
v++;
v->iov_base = nul;
v->iov_len = 0;
v++;
} else {
v->iov_base = f->f_lasttime;
v->iov_len = 15;
v++;
v->iov_base = space;
v->iov_len = 1;
v++;
}
if (LogFacPri) {
static char fp_buf[30]; /* Hollow laugh */
int fac = f->f_prevpri & LOG_FACMASK;
int pri = LOG_PRI(f->f_prevpri);
const char *f_s = NULL;
char f_n[5]; /* Hollow laugh */
const char *p_s = NULL;
char p_n[5]; /* Hollow laugh */
if (LogFacPri > 1) {
CODE *c;
for (c = facilitynames; c->c_name; c++) {
if (c->c_val == fac) {
f_s = c->c_name;
break;
}
}
for (c = prioritynames; c->c_name; c++) {
if (c->c_val == pri) {
p_s = c->c_name;
break;
}
}
}
if (!f_s) {
snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
f_s = f_n;
}
if (!p_s) {
snprintf(p_n, sizeof p_n, "%d", pri);
p_s = p_n;
}
snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
v->iov_base = fp_buf;
v->iov_len = strlen(fp_buf);
} else {
v->iov_base = nul;
v->iov_len = 0;
}
v++;
v->iov_base = f->f_prevhost;
v->iov_len = strlen(v->iov_base);
v++;
v->iov_base = space;
v->iov_len = 1;
v++;
if (msg) {
wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
if (wmsg == NULL) {
logerror("strdup");
exit(1);
}
v->iov_base = wmsg;
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 */
if (strcasecmp(f->f_prevhost, LocalHostName))
l = snprintf(line, sizeof line - 1,
"<%d>%.15s Forwarded from %s: %s",
f->f_prevpri, (char *)iov[0].iov_base,
f->f_prevhost, (char *)iov[5].iov_base);
else
l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
f->f_prevpri, (char *)iov[0].iov_base,
(char *)iov[5].iov_base);
if (l < 0)
l = 0;
else if (l > MAXLINE)
l = MAXLINE;
if (finet) {
for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
for (i = 0; i < *finet; i++) {
#if 0
/*
* should we check AF first, or just
* trial and error? FWD
*/
if (r->ai_family ==
address_family_of(finet[i+1]))
#endif
lsent = sendto(finet[i+1], line, l, 0,
r->ai_addr, r->ai_addrlen);
if (lsent == l)
break;
}
if (lsent == l && !send_to_all)
break;
}
dprintf("lsent/l: %d/%d\n", lsent, l);
if (lsent != l) {
int e = errno;
logerror("sendto");
errno = e;
switch (errno) {
case EHOSTUNREACH:
case EHOSTDOWN:
break;
/* case EBADF: */
/* case EACCES: */
/* case ENOTSOCK: */
/* case EFAULT: */
/* case EMSGSIZE: */
/* case EAGAIN: */
/* case ENOBUFS: */
/* case ECONNREFUSED: */
default:
dprintf("removing entry\n");
f->f_type = F_UNUSED;
break;
}
}
}
break;
case F_FILE:
dprintf(" %s\n", f->f_un.f_fname);
v->iov_base = lf;
v->iov_len = 1;
if (writev(f->f_file, iov, 7) < 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) && (f->f_flags & FFLAG_SYNC)) {
f->f_flags |= FFLAG_NEEDSYNC;
needdofsync = 1;
}
break;
case F_PIPE:
dprintf(" %s\n", f->f_un.f_pipe.f_pname);
v->iov_base = lf;
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, 7) < 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_pname);
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 = crlf;
v->iov_len = 2;
errno = 0; /* ttymsg() only sometimes returns an errno */
if ((msgret = ttymsg(iov, 7, 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 = crlf;
v->iov_len = 2;
wallmsg(f, iov);
break;
}
f->f_prevcount = 0;
if (msg)
free(wmsg);
}
/*
* WALLMSG -- Write a message to the world at large
*
* Write the specified message to either the entire
* world, or a list of approved users.
*/
static void
wallmsg(struct filed *f, struct iovec *iov)
{
static int reenter; /* avoid calling ourselves */
FILE *uf;
struct utmp ut;
int i;
const 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;
/* We must use strncpy since ut_* may not be NUL terminated. */
strncpy(line, ut.ut_line, sizeof(line) - 1);
line[sizeof(line) - 1] = '\0';
if (f->f_type == F_WALL) {
if ((p = ttymsg(iov, 7, 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, 7, line, TTYMSGTIME))
!= NULL) {
errno = 0; /* already in msg */
logerror(p);
}
break;
}
}
}
(void)fclose(uf);
reenter = 0;
}
static void
reapchild(int signo __unused)
{
int status;
pid_t pid;
struct filed *f;
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. */
if (deadq_remove(pid))
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);
f->f_un.f_pipe.f_pid = 0;
log_deadchild(pid, status,
f->f_un.f_pipe.f_pname);
break;
}
oncemore:
continue;
}
}
/*
* Return a printable representation of a host address.
*/
static const char *
cvthname(struct sockaddr *f)
{
int error, hl;
sigset_t omask, nmask;
static char hname[NI_MAXHOST], ip[NI_MAXHOST];
error = getnameinfo((struct sockaddr *)f,
((struct sockaddr *)f)->sa_len,
ip, sizeof ip, NULL, 0,
NI_NUMERICHOST | withscopeid);
dprintf("cvthname(%s)\n", ip);
if (error) {
dprintf("Malformed from address %s\n", gai_strerror(error));
return ("???");
}
if (!resolve)
return (ip);
sigemptyset(&nmask);
sigaddset(&nmask, SIGHUP);
sigprocmask(SIG_BLOCK, &nmask, &omask);
error = getnameinfo((struct sockaddr *)f,
((struct sockaddr *)f)->sa_len,
hname, sizeof hname, NULL, 0,
NI_NAMEREQD | withscopeid);
sigprocmask(SIG_SETMASK, &omask, NULL);
if (error) {
dprintf("Host name for your address (%s) unknown\n", ip);
return (ip);
}
hl = strlen(hname);
if (hl > 0 && hname[hl-1] == '.')
hname[--hl] = '\0';
trimdomain(hname, hl);
return (hname);
}
static void
dodie(int signo)
{
WantDie = signo;
}
static void
domark(int signo __unused)
{
MarkSet = 1;
}
/*
* Print syslogd errors some place.
*/
static void
logerror(const char *type)
{
char buf[512];
static int recursed = 0;
/* If there's an error while trying to log an error, give up. */
if (recursed)
return;
recursed++;
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);
recursed--;
}
static void
die(int signo)
{
struct filed *f;
struct funix *fx;
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 && f->f_un.f_pipe.f_pid > 0) {
(void)close(f->f_file);
f->f_un.f_pipe.f_pid = 0;
}
}
Initialized = was_initialized;
if (signo) {
dprintf("syslogd: exiting on signal %d\n", signo);
(void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
errno = 0;
logerror(buf);
}
STAILQ_FOREACH(fx, &funixes, next)
(void)unlink(fx->name);
exit(1);
}
/*
* INIT -- Initialize syslogd from configuration table
*/
static void
init(int signo)
{
int i;
FILE *cf;
struct filed *f, *next, **nextp;
char *p;
char cline[LINE_MAX];
char prog[NAME_MAX+1];
char host[MAXHOSTNAMELEN];
char oldLocalHostName[MAXHOSTNAMELEN];
char hostMsg[2*MAXHOSTNAMELEN+40];
char bootfileMsg[LINE_MAX];
dprintf("init\n");
/*
* Load hostname (may have changed).
*/
if (signo != 0)
(void)strlcpy(oldLocalHostName, LocalHostName,
sizeof(oldLocalHostName));
if (gethostname(LocalHostName, sizeof(LocalHostName)))
err(EX_OSERR, "gethostname() failed");
if ((p = strchr(LocalHostName, '.')) != NULL) {
*p++ = '\0';
LocalDomain = p;
} else {
LocalDomain = "";
}
/*
* 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:
if (f->f_un.f_pipe.f_pid > 0) {
(void)close(f->f_file);
deadq_enter(f->f_un.f_pipe.f_pid,
f->f_un.f_pipe.f_pname);
}
f->f_un.f_pipe.f_pid = 0;
break;
}
next = f->f_next;
if (f->f_program) free(f->f_program);
if (f->f_host) free(f->f_host);
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));
if (*nextp == NULL) {
logerror("calloc");
exit(1);
}
cfline("*.ERR\t/dev/console", *nextp, "*", "*");
(*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
if ((*nextp)->f_next == NULL) {
logerror("calloc");
exit(1);
}
cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
Initialized = 1;
return;
}
/*
* Foreach line in the conf table, open that file.
*/
f = NULL;
(void)strlcpy(host, "*", sizeof(host));
(void)strlcpy(prog, "*", sizeof(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 != '!' && *p != '+' && *p != '-')
continue;
}
if (*p == '+' || *p == '-') {
host[0] = *p++;
while (isspace(*p))
p++;
if ((!*p) || (*p == '*')) {
(void)strlcpy(host, "*", sizeof(host));
continue;
}
if (*p == '@')
p = LocalHostName;
for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
if (!isalnum(*p) && *p != '.' && *p != '-'
&& *p != ',')
break;
host[i] = *p++;
}
host[i] = '\0';
continue;
}
if (*p == '!') {
p++;
while (isspace(*p)) p++;
if ((!*p) || (*p == '*')) {
(void)strlcpy(prog, "*", sizeof(prog));
continue;
}
for (i = 0; i < NAME_MAX; i++) {
if (!isprint(p[i]))
break;
prog[i] = p[i];
}
prog[i] = 0;
continue;
}
for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
cline[i] = '\0';
f = (struct filed *)calloc(1, sizeof(*f));
if (f == NULL) {
logerror("calloc");
exit(1);
}
*nextp = f;
nextp = &f->f_next;
cfline(cline, f, prog, host);
}
/* 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");
/*
* Log a change in hostname, but only on a restart.
*/
if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
(void)snprintf(hostMsg, sizeof(hostMsg),
"syslogd: hostname changed, \"%s\" to \"%s\"",
oldLocalHostName, LocalHostName);
logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
dprintf("%s\n", hostMsg);
}
/*
* Log the kernel boot file if we aren't going to use it as
* the prefix, and if this is *not* a restart.
*/
if (signo == 0 && !use_bootfile) {
(void)snprintf(bootfileMsg, sizeof(bootfileMsg),
"syslogd: kernel boot file is %s", bootfile);
logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
dprintf("%s\n", bootfileMsg);
}
}
/*
* Crack a configuration file line
*/
static void
cfline(const char *line, struct filed *f, const char *prog, const char *host)
{
struct addrinfo hints, *res;
int error, i, pri, syncfile;
const char *p, *q;
char *bp;
char buf[MAXLINE], ebuf[100];
dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
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 hostname if any */
if (host && *host == '*')
host = NULL;
if (host) {
int hl;
f->f_host = strdup(host);
if (f->f_host == NULL) {
logerror("strdup");
exit(1);
}
hl = strlen(f->f_host);
if (hl > 0 && f->f_host[hl-1] == '.')
f->f_host[--hl] = '\0';
trimdomain(f->f_host, hl);
}
/* save program name if any */
if (prog && *prog == '*')
prog = NULL;
if (prog) {
f->f_program = strdup(prog);
if (f->f_program == NULL) {
logerror("strdup");
exit(1);
}
}
/* scan through the list of selectors */
for (p = line; *p && *p != '\t' && *p != ' ';) {
int pri_done;
int pri_cmp;
int pri_invert;
/* find the end of this facility name list */
for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
continue;
/* get the priority comparison */
pri_cmp = 0;
pri_done = 0;
pri_invert = 0;
if (*q == '!') {
pri_invert = 1;
q++;
}
while (!pri_done) {
switch (*q) {
case '<':
pri_cmp |= PRI_LT;
q++;
break;
case '=':
pri_cmp |= PRI_EQ;
q++;
break;
case '>':
pri_cmp |= PRI_GT;
q++;
break;
default:
pri_done++;
break;
}
}
/* 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;
pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
} else {
/* Ignore trailing spaces. */
for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
buf[i] = '\0';
pri = decode(buf, prioritynames);
if (pri < 0) {
(void)snprintf(ebuf, sizeof ebuf,
"unknown priority name \"%s\"", buf);
logerror(ebuf);
return;
}
}
if (!pri_cmp)
pri_cmp = (UniquePriority)
? (PRI_EQ)
: (PRI_EQ | PRI_GT)
;
if (pri_invert)
pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
/* 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;
f->f_pcmp[i] = pri_cmp;
}
} 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;
f->f_pcmp[i >> 3] = pri_cmp;
}
while (*p == ',' || *p == ' ')
p++;
}
p = q;
}
/* skip to action part */
while (*p == '\t' || *p == ' ')
p++;
if (*p == '-') {
syncfile = 0;
p++;
} else
syncfile = 1;
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 = family;
hints.ai_socktype = SOCK_DGRAM;
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;
break;
case '/':
if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
f->f_type = F_UNUSED;
logerror(p);
break;
}
if (syncfile)
f->f_flags |= FFLAG_SYNC;
if (isatty(f->f_file)) {
if (strcmp(p, ctty) == 0)
f->f_type = F_CONSOLE;
else
f->f_type = F_TTY;
(void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
sizeof(f->f_un.f_fname));
} else {
(void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
f->f_type = F_FILE;
}
break;
case '|':
f->f_un.f_pipe.f_pid = 0;
(void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname));
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
*/
static 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);
}
static void
markit(void)
{
struct filed *f;
dq_t q, next;
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 = next) {
next = TAILQ_NEXT(q, dq_entries);
switch (q->dq_timeout) {
case 0:
/* Already signalled once, try harder now. */
if (kill(q->dq_pid, SIGKILL) != 0)
(void)deadq_remove(q->dq_pid);
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 (unless the process
* didn't even really exist, in case we simply
* drop it from the dead queue).
*/
if (kill(q->dq_pid, SIGTERM) != 0)
(void)deadq_remove(q->dq_pid);
/* FALLTHROUGH */
default:
q->dq_timeout--;
}
}
MarkSet = 0;
(void)alarm(TIMERINTVL);
}
/*
* 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.
*/
static int
waitdaemon(int nochdir, int noclose, int 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.
*/
static void
timedout(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.
*/
static int
allowaddr(char *s)
{
char *cp1, *cp2;
struct allowedpeer ap;
struct servent *se;
int masklen = -1, i;
struct addrinfo hints, *res;
struct in_addr *addrp, *maskp;
u_int32_t *addr6p, *mask6p;
char ip[NI_MAXHOST];
#ifdef INET6
if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
#endif
cp1 = s;
if ((cp1 = strrchr(cp1, ':'))) {
/* service/port provided */
*cp1++ = '\0';
if (strlen(cp1) == 1 && *cp1 == '*')
/* any port allowed */
ap.port = 0;
else if ((se = getservbyname(cp1, "udp"))) {
ap.port = ntohs(se->s_port);
} else {
ap.port = strtol(cp1, &cp2, 0);
if (*cp2 != '\0')
return (-1); /* port not numeric */
}
} else {
if ((se = getservbyname("syslog", "udp")))
ap.port = ntohs(se->s_port);
else
/* sanity, should not happen */
ap.port = 514;
}
if ((cp1 = strchr(s, '/')) != NULL &&
strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
*cp1 = '\0';
if ((masklen = atoi(cp1 + 1)) < 0)
return (-1);
}
#ifdef INET6
if (*s == '[') {
cp2 = s + strlen(s) - 1;
if (*cp2 == ']') {
++s;
*cp2 = '\0';
} else {
cp2 = NULL;
}
} else {
cp2 = NULL;
}
#endif
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
if (getaddrinfo(s, NULL, &hints, &res) == 0) {
ap.isnumeric = 1;
memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
memset(&ap.a_mask, 0, sizeof(ap.a_mask));
ap.a_mask.ss_family = res->ai_family;
if (res->ai_family == AF_INET) {
ap.a_mask.ss_len = sizeof(struct sockaddr_in);
maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
if (masklen < 0) {
/* use default netmask */
if (IN_CLASSA(ntohl(addrp->s_addr)))
maskp->s_addr = htonl(IN_CLASSA_NET);
else if (IN_CLASSB(ntohl(addrp->s_addr)))
maskp->s_addr = htonl(IN_CLASSB_NET);
else
maskp->s_addr = htonl(IN_CLASSC_NET);
} else if (masklen <= 32) {
/* convert masklen to netmask */
if (masklen == 0)
maskp->s_addr = 0;
else
maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
} else {
freeaddrinfo(res);
return (-1);
}
/* Lose any host bits in the network number. */
addrp->s_addr &= maskp->s_addr;
}
#ifdef INET6
else if (res->ai_family == AF_INET6 && masklen <= 128) {
ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
if (masklen < 0)
masklen = 128;
mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
/* convert masklen to netmask */
while (masklen > 0) {
if (masklen < 32) {
*mask6p = htonl(~(0xffffffff >> masklen));
break;
}
*mask6p++ = 0xffffffff;
masklen -= 32;
}
/* Lose any host bits in the network number. */
mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
for (i = 0; i < 4; i++)
addr6p[i] &= mask6p[i];
}
#endif
else {
freeaddrinfo(res);
return (-1);
}
freeaddrinfo(res);
} else {
/* arg `s' is domain name */
ap.isnumeric = 0;
ap.a_name = s;
if (cp1)
*cp1 = '/';
#ifdef INET6
if (cp2) {
*cp2 = ']';
--s;
}
#endif
}
if (Debug) {
printf("allowaddr: rule %d: ", NumAllowed);
if (ap.isnumeric) {
printf("numeric, ");
getnameinfo((struct sockaddr *)&ap.a_addr,
((struct sockaddr *)&ap.a_addr)->sa_len,
ip, sizeof ip, NULL, 0,
NI_NUMERICHOST | withscopeid);
printf("addr = %s, ", ip);
getnameinfo((struct sockaddr *)&ap.a_mask,
((struct sockaddr *)&ap.a_mask)->sa_len,
ip, sizeof ip, NULL, 0,
NI_NUMERICHOST | withscopeid);
printf("mask = %s; ", ip);
} else {
printf("domainname = %s; ", ap.a_name);
}
printf("port = %d\n", ap.port);
}
if ((AllowedPeers = realloc(AllowedPeers,
++NumAllowed * sizeof(struct allowedpeer)))
== NULL) {
logerror("realloc");
exit(1);
}
memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
return (0);
}
/*
* Validate that the remote peer has permission to log to us.
*/
static int
validate(struct sockaddr *sa, const char *hname)
{
int i, j, reject;
size_t l1, l2;
char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
struct allowedpeer *ap;
struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
struct addrinfo hints, *res;
u_short sport;
if (NumAllowed == 0)
/* traditional behaviour, allow everything */
return (1);
(void)strlcpy(name, hname, sizeof(name));
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
if (getaddrinfo(name, NULL, &hints, &res) == 0)
freeaddrinfo(res);
else if (strchr(name, '.') == NULL) {
strlcat(name, ".", sizeof name);
strlcat(name, LocalDomain, sizeof name);
}
if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0)
return (0); /* for safety, should not occur */
dprintf("validate: dgram from IP %s, port %s, name %s;\n",
ip, port, name);
sport = atoi(port);
/* now, walk down the list */
for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
if (ap->port != 0 && ap->port != sport) {
dprintf("rejected in rule %d due to port mismatch.\n", i);
continue;
}
if (ap->isnumeric) {
if (ap->a_addr.ss_family != sa->sa_family) {
dprintf("rejected in rule %d due to address family mismatch.\n", i);
continue;
}
if (ap->a_addr.ss_family == AF_INET) {
sin4 = (struct sockaddr_in *)sa;
a4p = (struct sockaddr_in *)&ap->a_addr;
m4p = (struct sockaddr_in *)&ap->a_mask;
if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
!= a4p->sin_addr.s_addr) {
dprintf("rejected in rule %d due to IP mismatch.\n", i);
continue;
}
}
#ifdef INET6
else if (ap->a_addr.ss_family == AF_INET6) {
sin6 = (struct sockaddr_in6 *)sa;
a6p = (struct sockaddr_in6 *)&ap->a_addr;
m6p = (struct sockaddr_in6 *)&ap->a_mask;
#ifdef NI_WITHSCOPEID
if (a6p->sin6_scope_id != 0 &&
sin6->sin6_scope_id != a6p->sin6_scope_id) {
dprintf("rejected in rule %d due to scope mismatch.\n", i);
continue;
}
#endif
reject = 0;
for (j = 0; j < 16; j += 4) {
if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
!= *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
++reject;
break;
}
}
if (reject) {
dprintf("rejected in rule %d due to IP mismatch.\n", i);
continue;
}
}
#endif
else
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 *.
*/
static int
p_open(const char *prog, pid_t *rpid)
{
int pfd[2], nulldesc, i;
pid_t pid;
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);
sigemptyset(&mask);
sigaddset(&mask, SIGALRM);
sigaddset(&mask, SIGHUP);
sigprocmask(SIG_BLOCK, &mask, &omask);
switch ((pid = fork())) {
case -1:
sigprocmask(SIG_SETMASK, &omask, 0);
close(nulldesc);
return (-1);
case 0:
argv[0] = strdup("sh");
argv[1] = strdup("-c");
argv[2] = strdup(prog);
argv[3] = NULL;
if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
logerror("strdup");
exit(1);
}
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, &omask, 0);
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, &omask, 0);
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);
}
*rpid = pid;
return (pfd[1]);
}
static void
deadq_enter(pid_t pid, const char *name)
{
dq_t p;
int status;
/*
* Be paranoid, if we can't signal the process, don't enter it
* into the dead queue (perhaps it's already dead). If possible,
* we try to fetch and log the child's status.
*/
if (kill(pid, 0) != 0) {
if (waitpid(pid, &status, WNOHANG) > 0)
log_deadchild(pid, status, name);
return;
}
p = malloc(sizeof(struct deadq_entry));
if (p == NULL) {
logerror("malloc");
exit(1);
}
p->dq_pid = pid;
p->dq_timeout = DQ_TIMO_INIT;
TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
}
static int
deadq_remove(pid_t pid)
{
dq_t q;
TAILQ_FOREACH(q, &deadq_head, dq_entries) {
if (q->dq_pid == pid) {
TAILQ_REMOVE(&deadq_head, q, dq_entries);
free(q);
return (1);
}
}
return (0);
}
static void
log_deadchild(pid_t pid, int status, const char *name)
{
int code;
char buf[256];
const char *reason;
errno = 0; /* Keep strerror() stuff out of logerror messages. */
if (WIFSIGNALED(status)) {
reason = "due to signal";
code = WTERMSIG(status);
} else {
reason = "with status";
code = WEXITSTATUS(status);
if (code == 0)
return;
}
(void)snprintf(buf, sizeof buf,
"Logging subprocess %d (%s) exited %s %d.",
pid, name, reason, code);
logerror(buf);
}
static int *
socksetup(int af, const char *bindhostname)
{
struct addrinfo hints, *res, *r;
int error, maxs, *s, *socks;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_family = af;
hints.ai_socktype = SOCK_DGRAM;
error = getaddrinfo(bindhostname, "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++);
socks = malloc((maxs+1) * sizeof(int));
if (socks == NULL) {
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");
continue;
}
if (r->ai_family == AF_INET6) {
int on = 1;
if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
(char *)&on, sizeof (on)) < 0) {
logerror("setsockopt");
close(*s);
continue;
}
}
if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
close(*s);
logerror("bind");
continue;
}
double_rbuf(*s);
(*socks)++;
s++;
}
if (*socks == 0) {
free(socks);
if (Debug)
return (NULL);
else
die(0);
}
if (res)
freeaddrinfo(res);
return (socks);
}
static void
double_rbuf(int fd)
{
socklen_t slen, len;
if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
len *= 2;
setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen);
}
}
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