freebsd-dev/usr.sbin/faithd/faithd.c

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/* $KAME: faithd.c,v 1.67 2003/10/16 05:26:21 itojun Exp $ */
/*
* Copyright (C) 1997 and 1998 WIDE Project.
* 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 project 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 PROJECT 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 PROJECT 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.
*
* $FreeBSD$
*/
/*
* User level translator from IPv6 to IPv4.
*
* Usage: faithd [<port> <progpath> <arg1(progname)> <arg2> ...]
* e.g. faithd telnet /usr/libexec/telnetd telnetd
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <libutil.h>
#ifdef HAVE_POLL_H
#include <poll.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <termios.h>
#include <net/if_types.h>
#ifdef IFT_FAITH
# define USE_ROUTE
# include <net/if.h>
# include <net/route.h>
# include <net/if_dl.h>
#endif
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <ifaddrs.h>
#include "faithd.h"
#include "prefix.h"
char *serverpath = NULL;
char *serverarg[MAXARGV + 1];
static char *faithdname = NULL;
char logname[BUFSIZ];
char procname[BUFSIZ];
struct myaddrs {
struct myaddrs *next;
struct sockaddr *addr;
};
struct myaddrs *myaddrs = NULL;
static const char *service;
#ifdef USE_ROUTE
static int sockfd = 0;
#endif
int dflag = 0;
static int pflag = 0;
static int inetd = 0;
static char *configfile = NULL;
int main __P((int, char **));
static int inetd_main __P((int, char **));
static int daemon_main __P((int, char **));
static void play_service __P((int));
static void play_child __P((int, struct sockaddr *));
static int faith_prefix __P((struct sockaddr *));
static int map6to4 __P((struct sockaddr_in6 *, struct sockaddr_in *));
static void sig_child __P((int));
static void sig_terminate __P((int));
static void start_daemon __P((void));
static void exit_stderr __P((const char *, ...))
__attribute__((__format__(__printf__, 1, 2)));
static void grab_myaddrs __P((void));
static void free_myaddrs __P((void));
static void update_myaddrs __P((void));
static void usage __P((void));
int
main(int argc, char **argv)
{
/*
* Initializing stuff
*/
faithdname = strrchr(argv[0], '/');
if (faithdname)
faithdname++;
else
faithdname = argv[0];
if (strcmp(faithdname, "faithd") != 0) {
inetd = 1;
return inetd_main(argc, argv);
} else
return daemon_main(argc, argv);
}
static int
inetd_main(int argc, char **argv)
{
char path[MAXPATHLEN];
struct sockaddr_storage me;
struct sockaddr_storage from;
socklen_t melen, fromlen;
int i;
int error;
const int on = 1;
char sbuf[NI_MAXSERV], snum[NI_MAXSERV];
if (config_load(configfile) < 0 && configfile) {
exit_failure("could not load config file");
/*NOTREACHED*/
}
if (strrchr(argv[0], '/') == NULL)
snprintf(path, sizeof(path), "%s/%s", DEFAULT_DIR, argv[0]);
else
snprintf(path, sizeof(path), "%s", argv[0]);
#ifdef USE_ROUTE
grab_myaddrs();
sockfd = socket(PF_ROUTE, SOCK_RAW, PF_UNSPEC);
if (sockfd < 0) {
exit_failure("socket(PF_ROUTE): %s", strerror(errno));
/*NOTREACHED*/
}
#endif
melen = sizeof(me);
if (getsockname(STDIN_FILENO, (struct sockaddr *)&me, &melen) < 0) {
exit_failure("getsockname: %s", strerror(errno));
/*NOTREACHED*/
}
fromlen = sizeof(from);
if (getpeername(STDIN_FILENO, (struct sockaddr *)&from, &fromlen) < 0) {
exit_failure("getpeername: %s", strerror(errno));
/*NOTREACHED*/
}
if (getnameinfo((struct sockaddr *)&me, melen, NULL, 0,
sbuf, sizeof(sbuf), NI_NUMERICHOST) == 0)
service = sbuf;
else
service = DEFAULT_PORT_NAME;
if (getnameinfo((struct sockaddr *)&me, melen, NULL, 0,
snum, sizeof(snum), NI_NUMERICHOST) != 0)
snprintf(snum, sizeof(snum), "?");
snprintf(logname, sizeof(logname), "faithd %s", snum);
snprintf(procname, sizeof(procname), "accepting port %s", snum);
openlog(logname, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
if (argc >= MAXARGV) {
exit_failure("too many arguments");
/*NOTREACHED*/
}
serverarg[0] = serverpath = path;
for (i = 1; i < argc; i++)
serverarg[i] = argv[i];
serverarg[i] = NULL;
error = setsockopt(STDIN_FILENO, SOL_SOCKET, SO_OOBINLINE, &on,
sizeof(on));
if (error < 0) {
exit_failure("setsockopt(SO_OOBINLINE): %s", strerror(errno));
/*NOTREACHED*/
}
play_child(STDIN_FILENO, (struct sockaddr *)&from);
exit_failure("should not reach here");
return 0; /*dummy!*/
}
static int
daemon_main(int argc, char **argv)
{
struct addrinfo hints, *res;
int s_wld, error, i, serverargc, on = 1;
int family = AF_INET6;
int c;
while ((c = getopt(argc, argv, "df:p")) != -1) {
switch (c) {
case 'd':
dflag++;
break;
case 'f':
configfile = optarg;
break;
case 'p':
pflag++;
break;
default:
usage();
/*NOTREACHED*/
}
}
argc -= optind;
argv += optind;
if (config_load(configfile) < 0 && configfile) {
exit_failure("could not load config file");
/*NOTREACHED*/
}
#ifdef USE_ROUTE
grab_myaddrs();
#endif
switch (argc) {
case 0:
usage();
/*NOTREACHED*/
default:
serverargc = argc - NUMARG;
if (serverargc >= MAXARGV)
exit_stderr("too many arguments");
serverpath = strdup(argv[NUMPRG]);
if (!serverpath)
exit_stderr("not enough core");
for (i = 0; i < serverargc; i++) {
serverarg[i] = strdup(argv[i + NUMARG]);
if (!serverarg[i])
exit_stderr("not enough core");
}
serverarg[i] = NULL;
/* fall throuth */
case 1: /* no local service */
service = argv[NUMPRT];
break;
}
start_daemon();
/*
* Opening wild card socket for this service.
*/
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_family = family;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP; /* SCTP? */
error = getaddrinfo(NULL, service, &hints, &res);
if (error)
exit_failure("getaddrinfo: %s", gai_strerror(error));
s_wld = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s_wld == -1)
exit_failure("socket: %s", strerror(errno));
#ifdef IPV6_FAITH
if (res->ai_family == AF_INET6) {
error = setsockopt(s_wld, IPPROTO_IPV6, IPV6_FAITH, &on, sizeof(on));
if (error == -1)
exit_failure("setsockopt(IPV6_FAITH): %s",
strerror(errno));
}
#endif
error = setsockopt(s_wld, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
if (error == -1)
exit_failure("setsockopt(SO_REUSEADDR): %s", strerror(errno));
error = setsockopt(s_wld, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on));
if (error == -1)
exit_failure("setsockopt(SO_OOBINLINE): %s", strerror(errno));
#ifdef IPV6_V6ONLY
error = setsockopt(s_wld, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
if (error == -1)
exit_failure("setsockopt(IPV6_V6ONLY): %s", strerror(errno));
#endif
error = bind(s_wld, (struct sockaddr *)res->ai_addr, res->ai_addrlen);
if (error == -1)
exit_failure("bind: %s", strerror(errno));
error = listen(s_wld, 5);
if (error == -1)
exit_failure("listen: %s", strerror(errno));
#ifdef USE_ROUTE
sockfd = socket(PF_ROUTE, SOCK_RAW, PF_UNSPEC);
if (sockfd < 0) {
exit_failure("socket(PF_ROUTE): %s", strerror(errno));
/*NOTREACHED*/
}
#endif
/*
* Everything is OK.
*/
snprintf(logname, sizeof(logname), "faithd %s", service);
snprintf(procname, sizeof(procname), "accepting port %s", service);
openlog(logname, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
syslog(LOG_INFO, "Staring faith daemon for %s port", service);
play_service(s_wld);
/* NOTREACHED */
exit(1); /*pacify gcc*/
}
static void
play_service(int s_wld)
{
struct sockaddr_storage srcaddr;
socklen_t len;
int s_src;
pid_t child_pid;
#ifdef HAVE_POLL_H
struct pollfd pfd[2];
#else
fd_set rfds;
int maxfd;
#endif
int error;
/*
* Wait, accept, fork, faith....
*/
again:
setproctitle("%s", procname);
#ifdef HAVE_POLL_H
pfd[0].fd = s_wld;
pfd[0].events = POLLIN;
pfd[1].fd = -1;
pfd[1].revents = 0;
#else
FD_ZERO(&rfds);
if (s_wld >= FD_SETSIZE)
exit_failure("descriptor too big");
FD_SET(s_wld, &rfds);
maxfd = s_wld;
#endif
#ifdef USE_ROUTE
if (sockfd) {
#ifdef HAVE_POLL_H
pfd[1].fd = sockfd;
pfd[1].events = POLLIN;
#else
if (sockfd >= FD_SETSIZE)
exit_failure("descriptor too big");
FD_SET(sockfd, &rfds);
maxfd = (maxfd < sockfd) ? sockfd : maxfd;
#endif
}
#endif
#ifdef HAVE_POLL_H
error = poll(pfd, sizeof(pfd)/sizeof(pfd[0]), INFTIM);
#else
error = select(maxfd + 1, &rfds, NULL, NULL, NULL);
#endif
if (error < 0) {
if (errno == EINTR)
goto again;
exit_failure("select: %s", strerror(errno));
/*NOTREACHED*/
}
#ifdef USE_ROUTE
#ifdef HAVE_POLL_H
if (pfd[1].revents & POLLIN)
#else
if (FD_ISSET(sockfd, &rfds))
#endif
{
update_myaddrs();
}
#endif
#ifdef HAVE_POLL_H
if (pfd[0].revents & POLLIN)
#else
if (FD_ISSET(s_wld, &rfds))
#endif
{
len = sizeof(srcaddr);
s_src = accept(s_wld, (struct sockaddr *)&srcaddr, &len);
if (s_src < 0) {
if (errno == ECONNABORTED)
goto again;
exit_failure("socket: %s", strerror(errno));
/*NOTREACHED*/
}
if (srcaddr.ss_family == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&srcaddr)->sin6_addr)) {
close(s_src);
syslog(LOG_ERR, "connection from IPv4 mapped address?");
goto again;
}
child_pid = fork();
if (child_pid == 0) {
/* child process */
close(s_wld);
closelog();
openlog(logname, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
play_child(s_src, (struct sockaddr *)&srcaddr);
exit_failure("should never reach here");
/*NOTREACHED*/
} else {
/* parent process */
close(s_src);
if (child_pid == -1)
syslog(LOG_ERR, "can't fork");
}
}
goto again;
}
static void
play_child(int s_src, struct sockaddr *srcaddr)
{
struct sockaddr_storage dstaddr6;
struct sockaddr_storage dstaddr4;
char src[NI_MAXHOST];
char dst6[NI_MAXHOST];
char dst4[NI_MAXHOST];
socklen_t len = sizeof(dstaddr6);
int s_dst, error, hport, nresvport, on = 1;
struct timeval tv;
struct sockaddr *sa4;
const struct config *conf;
tv.tv_sec = 1;
tv.tv_usec = 0;
getnameinfo(srcaddr, srcaddr->sa_len,
src, sizeof(src), NULL, 0, NI_NUMERICHOST);
syslog(LOG_INFO, "accepted a client from %s", src);
error = getsockname(s_src, (struct sockaddr *)&dstaddr6, &len);
if (error == -1) {
exit_failure("getsockname: %s", strerror(errno));
/*NOTREACHED*/
}
getnameinfo((struct sockaddr *)&dstaddr6, len,
dst6, sizeof(dst6), NULL, 0, NI_NUMERICHOST);
syslog(LOG_INFO, "the client is connecting to %s", dst6);
if (!faith_prefix((struct sockaddr *)&dstaddr6)) {
if (serverpath) {
/*
* Local service
*/
syslog(LOG_INFO, "executing local %s", serverpath);
if (!inetd) {
dup2(s_src, 0);
close(s_src);
dup2(0, 1);
dup2(0, 2);
}
execv(serverpath, serverarg);
syslog(LOG_ERR, "execv %s: %s", serverpath,
strerror(errno));
_exit(EXIT_FAILURE);
} else {
close(s_src);
exit_success("no local service for %s", service);
}
}
/*
* Act as a translator
*/
switch (((struct sockaddr *)&dstaddr6)->sa_family) {
case AF_INET6:
if (!map6to4((struct sockaddr_in6 *)&dstaddr6,
(struct sockaddr_in *)&dstaddr4)) {
close(s_src);
exit_failure("map6to4 failed");
/*NOTREACHED*/
}
syslog(LOG_INFO, "translating from v6 to v4");
break;
default:
close(s_src);
exit_failure("family not supported");
/*NOTREACHED*/
}
sa4 = (struct sockaddr *)&dstaddr4;
getnameinfo(sa4, sa4->sa_len,
dst4, sizeof(dst4), NULL, 0, NI_NUMERICHOST);
conf = config_match(srcaddr, sa4);
if (!conf || !conf->permit) {
close(s_src);
if (conf) {
exit_failure("translation to %s not permitted for %s",
dst4, prefix_string(&conf->match));
/*NOTREACHED*/
} else {
exit_failure("translation to %s not permitted", dst4);
/*NOTREACHED*/
}
}
syslog(LOG_INFO, "the translator is connecting to %s", dst4);
setproctitle("port %s, %s -> %s", service, src, dst4);
if (sa4->sa_family == AF_INET6)
hport = ntohs(((struct sockaddr_in6 *)&dstaddr4)->sin6_port);
else /* AF_INET */
hport = ntohs(((struct sockaddr_in *)&dstaddr4)->sin_port);
if (pflag)
s_dst = rresvport_af(&nresvport, sa4->sa_family);
else
s_dst = socket(sa4->sa_family, SOCK_STREAM, 0);
if (s_dst < 0) {
exit_failure("socket: %s", strerror(errno));
/*NOTREACHED*/
}
if (conf->src.a.ss_family) {
if (bind(s_dst, (const struct sockaddr *)&conf->src.a,
conf->src.a.ss_len) < 0) {
exit_failure("bind: %s", strerror(errno));
/*NOTREACHED*/
}
}
error = setsockopt(s_dst, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on));
if (error < 0) {
exit_failure("setsockopt(SO_OOBINLINE): %s", strerror(errno));
/*NOTREACHED*/
}
error = setsockopt(s_src, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
if (error < 0) {
exit_failure("setsockopt(SO_SNDTIMEO): %s", strerror(errno));
/*NOTREACHED*/
}
error = setsockopt(s_dst, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
if (error < 0) {
exit_failure("setsockopt(SO_SNDTIMEO): %s", strerror(errno));
/*NOTREACHED*/
}
error = connect(s_dst, sa4, sa4->sa_len);
if (error < 0) {
exit_failure("connect: %s", strerror(errno));
/*NOTREACHED*/
}
switch (hport) {
case FTP_PORT:
ftp_relay(s_src, s_dst);
break;
default:
tcp_relay(s_src, s_dst, service);
break;
}
/* NOTREACHED */
}
/* 0: non faith, 1: faith */
static int
faith_prefix(struct sockaddr *dst)
{
#ifndef USE_ROUTE
int mib[4], size;
struct in6_addr faith_prefix;
struct sockaddr_in6 *dst6 = (struct sockaddr_in *)dst;
if (dst->sa_family != AF_INET6)
return 0;
mib[0] = CTL_NET;
mib[1] = PF_INET6;
mib[2] = IPPROTO_IPV6;
mib[3] = IPV6CTL_FAITH_PREFIX;
size = sizeof(struct in6_addr);
if (sysctl(mib, 4, &faith_prefix, &size, NULL, 0) < 0) {
exit_failure("sysctl: %s", strerror(errno));
/*NOTREACHED*/
}
if (memcmp(dst, &faith_prefix,
sizeof(struct in6_addr) - sizeof(struct in_addr) == 0) {
return 1;
}
return 0;
#else
struct myaddrs *p;
struct sockaddr_in6 *sin6;
struct sockaddr_in *sin4;
struct sockaddr_in6 *dst6;
struct sockaddr_in *dst4;
struct sockaddr_in dstmap;
dst6 = (struct sockaddr_in6 *)dst;
if (dst->sa_family == AF_INET6
&& IN6_IS_ADDR_V4MAPPED(&dst6->sin6_addr)) {
/* ugly... */
memset(&dstmap, 0, sizeof(dstmap));
dstmap.sin_family = AF_INET;
dstmap.sin_len = sizeof(dstmap);
memcpy(&dstmap.sin_addr, &dst6->sin6_addr.s6_addr[12],
sizeof(dstmap.sin_addr));
dst = (struct sockaddr *)&dstmap;
}
dst6 = (struct sockaddr_in6 *)dst;
dst4 = (struct sockaddr_in *)dst;
for (p = myaddrs; p; p = p->next) {
sin6 = (struct sockaddr_in6 *)p->addr;
sin4 = (struct sockaddr_in *)p->addr;
if (p->addr->sa_len != dst->sa_len
|| p->addr->sa_family != dst->sa_family)
continue;
switch (dst->sa_family) {
case AF_INET6:
if (sin6->sin6_scope_id == dst6->sin6_scope_id
&& IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &dst6->sin6_addr))
return 0;
break;
case AF_INET:
if (sin4->sin_addr.s_addr == dst4->sin_addr.s_addr)
return 0;
break;
}
}
return 1;
#endif
}
/* 0: non faith, 1: faith */
static int
map6to4(struct sockaddr_in6 *dst6, struct sockaddr_in *dst4)
{
memset(dst4, 0, sizeof(*dst4));
dst4->sin_len = sizeof(*dst4);
dst4->sin_family = AF_INET;
dst4->sin_port = dst6->sin6_port;
memcpy(&dst4->sin_addr, &dst6->sin6_addr.s6_addr[12],
sizeof(dst4->sin_addr));
if (dst4->sin_addr.s_addr == INADDR_ANY
|| dst4->sin_addr.s_addr == INADDR_BROADCAST
|| IN_MULTICAST(ntohl(dst4->sin_addr.s_addr)))
return 0;
return 1;
}
static void
sig_child(int sig)
{
int status;
pid_t pid;
while ((pid = wait3(&status, WNOHANG, (struct rusage *)0)) > 0)
if (WEXITSTATUS(status))
syslog(LOG_WARNING, "child %ld exit status 0x%x",
(long)pid, status);
}
void
sig_terminate(int sig)
{
syslog(LOG_INFO, "Terminating faith daemon");
exit(EXIT_SUCCESS);
}
static void
start_daemon(void)
{
#ifdef SA_NOCLDWAIT
struct sigaction sa;
#endif
if (daemon(0, 0) == -1)
exit_stderr("daemon: %s", strerror(errno));
#ifdef SA_NOCLDWAIT
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sig_child;
sa.sa_flags = SA_NOCLDWAIT;
sigemptyset(&sa.sa_mask);
sigaction(SIGCHLD, &sa, (struct sigaction *)0);
#else
if (signal(SIGCHLD, sig_child) == SIG_ERR) {
exit_failure("signal CHLD: %s", strerror(errno));
/*NOTREACHED*/
}
#endif
if (signal(SIGTERM, sig_terminate) == SIG_ERR) {
exit_failure("signal TERM: %s", strerror(errno));
/*NOTREACHED*/
}
}
static void
exit_stderr(const char *fmt, ...)
{
va_list ap;
char buf[BUFSIZ];
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
fprintf(stderr, "%s\n", buf);
exit(EXIT_FAILURE);
}
void
exit_failure(const char *fmt, ...)
{
va_list ap;
char buf[BUFSIZ];
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
syslog(LOG_ERR, "%s", buf);
exit(EXIT_FAILURE);
}
void
exit_success(const char *fmt, ...)
{
va_list ap;
char buf[BUFSIZ];
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
syslog(LOG_INFO, "%s", buf);
exit(EXIT_SUCCESS);
}
#ifdef USE_ROUTE
static void
grab_myaddrs()
{
struct ifaddrs *ifap, *ifa;
struct myaddrs *p;
struct sockaddr_in6 *sin6;
if (getifaddrs(&ifap) != 0) {
exit_failure("getifaddrs");
/*NOTREACHED*/
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
switch (ifa->ifa_addr->sa_family) {
case AF_INET:
case AF_INET6:
break;
default:
continue;
}
p = (struct myaddrs *)malloc(sizeof(struct myaddrs) +
ifa->ifa_addr->sa_len);
if (!p) {
exit_failure("not enough core");
/*NOTREACHED*/
}
memcpy(p + 1, ifa->ifa_addr, ifa->ifa_addr->sa_len);
p->next = myaddrs;
p->addr = (struct sockaddr *)(p + 1);
#ifdef __KAME__
if (ifa->ifa_addr->sa_family == AF_INET6) {
sin6 = (struct sockaddr_in6 *)p->addr;
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)
|| IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
sin6->sin6_scope_id =
ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
sin6->sin6_addr.s6_addr[2] = 0;
sin6->sin6_addr.s6_addr[3] = 0;
}
}
#endif
myaddrs = p;
if (dflag) {
char hbuf[NI_MAXHOST];
getnameinfo(p->addr, p->addr->sa_len,
hbuf, sizeof(hbuf), NULL, 0,
NI_NUMERICHOST);
syslog(LOG_INFO, "my interface: %s %s", hbuf,
ifa->ifa_name);
}
}
freeifaddrs(ifap);
}
static void
free_myaddrs()
{
struct myaddrs *p, *q;
p = myaddrs;
while (p) {
q = p->next;
free(p);
p = q;
}
myaddrs = NULL;
}
static void
update_myaddrs()
{
char msg[BUFSIZ];
int len;
struct rt_msghdr *rtm;
len = read(sockfd, msg, sizeof(msg));
if (len < 0) {
syslog(LOG_ERR, "read(PF_ROUTE) failed");
return;
}
rtm = (struct rt_msghdr *)msg;
if (len < 4 || len < rtm->rtm_msglen) {
syslog(LOG_ERR, "read(PF_ROUTE) short read");
return;
}
if (rtm->rtm_version != RTM_VERSION) {
syslog(LOG_ERR, "routing socket version mismatch");
close(sockfd);
sockfd = 0;
return;
}
switch (rtm->rtm_type) {
case RTM_NEWADDR:
case RTM_DELADDR:
case RTM_IFINFO:
break;
default:
return;
}
/* XXX more filters here? */
syslog(LOG_INFO, "update interface address list");
free_myaddrs();
grab_myaddrs();
}
#endif /*USE_ROUTE*/
static void
usage()
{
fprintf(stderr, "usage: %s [-dp] [-f conf] service [serverpath [serverargs]]\n",
faithdname);
exit(0);
}