| Current Path : /usr/src/usr.sbin/rtsold/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/usr.sbin/rtsold/rtsold.c |
/* $KAME: rtsold.c,v 1.67 2003/05/17 18:16:15 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 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: release/9.1.0/usr.sbin/rtsold/rtsold.c 225520 2011-09-12 23:55:23Z hrs $
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netinet/icmp6.h>
#include <netinet/in_var.h>
#include <arpa/inet.h>
#include <netinet6/nd6.h>
#include <signal.h>
#include <unistd.h>
#include <syslog.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <err.h>
#include <stdarg.h>
#include <ifaddrs.h>
#ifdef HAVE_POLL_H
#include <poll.h>
#endif
#include "rtsold.h"
#define RTSOL_DUMPFILE "/var/run/rtsold.dump";
#define RTSOL_PIDFILE "/var/run/rtsold.pid";
struct ifinfo *iflist;
struct timeval tm_max = {0x7fffffff, 0x7fffffff};
static int log_upto = 999;
static int fflag = 0;
int Fflag = 0; /* force setting sysctl parameters */
int aflag = 0;
int dflag = 0;
int uflag = 0;
const char *otherconf_script;
const char *resolvconf_script = "/sbin/resolvconf";
/* protocol constants */
#define MAX_RTR_SOLICITATION_DELAY 1 /* second */
#define RTR_SOLICITATION_INTERVAL 4 /* seconds */
#define MAX_RTR_SOLICITATIONS 3 /* times */
/*
* implementation dependent constants in seconds
* XXX: should be configurable
*/
#define PROBE_INTERVAL 60
/* static variables and functions */
static int mobile_node = 0;
static const char *pidfilename = RTSOL_PIDFILE;
#ifndef SMALL
static int do_dump;
static const char *dumpfilename = RTSOL_DUMPFILE;
#endif
#if 0
static int ifreconfig(char *);
#endif
static int make_packet(struct ifinfo *);
static struct timeval *rtsol_check_timer(void);
#ifndef SMALL
static void rtsold_set_dump_file(int);
#endif
static void usage(void);
int
main(int argc, char **argv)
{
int s, ch, once = 0;
struct timeval *timeout;
const char *opts;
#ifdef HAVE_POLL_H
struct pollfd set[2];
#else
fd_set *fdsetp, *selectfdp;
int fdmasks;
int maxfd;
#endif
int rtsock;
char *argv0;
#ifndef SMALL
/* rtsold */
opts = "adDfFm1O:p:R:u";
#else
/* rtsol */
opts = "adDFO:R:u";
fflag = 1;
once = 1;
#endif
argv0 = argv[0];
while ((ch = getopt(argc, argv, opts)) != -1) {
switch (ch) {
case 'a':
aflag = 1;
break;
case 'd':
dflag += 1;
break;
case 'D':
dflag += 2;
break;
case 'f':
fflag = 1;
break;
case 'F':
Fflag = 1;
break;
case 'm':
mobile_node = 1;
break;
case '1':
once = 1;
break;
case 'O':
otherconf_script = optarg;
break;
case 'p':
pidfilename = optarg;
break;
case 'R':
resolvconf_script = optarg;
break;
case 'u':
uflag = 1;
break;
default:
usage();
exit(1);
}
}
argc -= optind;
argv += optind;
if ((!aflag && argc == 0) || (aflag && argc != 0)) {
usage();
exit(1);
}
/* set log level */
if (dflag > 1)
log_upto = LOG_DEBUG;
else if (dflag > 0)
log_upto = LOG_INFO;
else
log_upto = LOG_NOTICE;
if (!fflag) {
char *ident;
ident = strrchr(argv0, '/');
if (!ident)
ident = argv0;
else
ident++;
openlog(ident, LOG_NDELAY|LOG_PID, LOG_DAEMON);
if (log_upto >= 0)
setlogmask(LOG_UPTO(log_upto));
}
if (otherconf_script && *otherconf_script != '/') {
errx(1, "configuration script (%s) must be an absolute path",
otherconf_script);
}
if (resolvconf_script && *resolvconf_script != '/') {
errx(1, "configuration script (%s) must be an absolute path",
resolvconf_script);
}
if (pidfilename && *pidfilename != '/') {
errx(1, "pid filename (%s) must be an absolute path",
pidfilename);
}
#ifndef HAVE_ARC4RANDOM
/* random value initialization */
srandom((u_long)time(NULL));
#endif
#if (__FreeBSD_version < 900000)
if (Fflag) {
setinet6sysctl(IPV6CTL_FORWARDING, 0);
} else {
/* warn if forwarding is up */
if (getinet6sysctl(IPV6CTL_FORWARDING))
warnx("kernel is configured as a router, not a host");
}
#endif
#ifndef SMALL
/* initialization to dump internal status to a file */
signal(SIGUSR1, rtsold_set_dump_file);
#endif
if (!fflag)
daemon(0, 0); /* act as a daemon */
/*
* Open a socket for sending RS and receiving RA.
* This should be done before calling ifinit(), since the function
* uses the socket.
*/
if ((s = sockopen()) < 0) {
warnmsg(LOG_ERR, __func__, "failed to open a socket");
exit(1);
}
#ifdef HAVE_POLL_H
set[0].fd = s;
set[0].events = POLLIN;
#else
maxfd = s;
#endif
#ifdef HAVE_POLL_H
set[1].fd = -1;
#endif
if ((rtsock = rtsock_open()) < 0) {
warnmsg(LOG_ERR, __func__, "failed to open a socket");
exit(1);
}
#ifdef HAVE_POLL_H
set[1].fd = rtsock;
set[1].events = POLLIN;
#else
if (rtsock > maxfd)
maxfd = rtsock;
#endif
#ifndef HAVE_POLL_H
fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask);
if ((fdsetp = malloc(fdmasks)) == NULL) {
warnmsg(LOG_ERR, __func__, "malloc");
exit(1);
}
if ((selectfdp = malloc(fdmasks)) == NULL) {
warnmsg(LOG_ERR, __func__, "malloc");
exit(1);
}
#endif
/* configuration per interface */
if (ifinit()) {
warnmsg(LOG_ERR, __func__,
"failed to initialize interfaces");
exit(1);
}
if (aflag)
argv = autoifprobe();
while (argv && *argv) {
if (ifconfig(*argv)) {
warnmsg(LOG_ERR, __func__,
"failed to initialize %s", *argv);
exit(1);
}
argv++;
}
/* setup for probing default routers */
if (probe_init()) {
warnmsg(LOG_ERR, __func__,
"failed to setup for probing routers");
exit(1);
/*NOTREACHED*/
}
/* dump the current pid */
if (!once) {
pid_t pid = getpid();
FILE *fp;
if ((fp = fopen(pidfilename, "w")) == NULL)
warnmsg(LOG_ERR, __func__,
"failed to open a pid log file(%s): %s",
pidfilename, strerror(errno));
else {
fprintf(fp, "%d\n", pid);
fclose(fp);
}
}
#ifndef HAVE_POLL_H
memset(fdsetp, 0, fdmasks);
FD_SET(s, fdsetp);
FD_SET(rtsock, fdsetp);
#endif
while (1) { /* main loop */
int e;
#ifndef HAVE_POLL_H
memcpy(selectfdp, fdsetp, fdmasks);
#endif
#ifndef SMALL
if (do_dump) { /* SIGUSR1 */
do_dump = 0;
rtsold_dump_file(dumpfilename);
}
#endif
timeout = rtsol_check_timer();
if (once) {
struct ifinfo *ifi;
/* if we have no timeout, we are done (or failed) */
if (timeout == NULL)
break;
/* if all interfaces have got RA packet, we are done */
TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
if (ifi->state != IFS_DOWN && ifi->racnt == 0)
break;
}
if (ifi == NULL)
break;
}
#ifdef HAVE_POLL_H
e = poll(set, 2, timeout ? (timeout->tv_sec * 1000 + timeout->tv_usec / 1000) : INFTIM);
#else
e = select(maxfd + 1, selectfdp, NULL, NULL, timeout);
#endif
if (e < 1) {
if (e < 0 && errno != EINTR) {
warnmsg(LOG_ERR, __func__, "select: %s",
strerror(errno));
}
continue;
}
/* packet reception */
#ifdef HAVE_POLL_H
if (set[1].revents & POLLIN)
#else
if (FD_ISSET(rtsock, selectfdp))
#endif
rtsock_input(rtsock);
#ifdef HAVE_POLL_H
if (set[0].revents & POLLIN)
#else
if (FD_ISSET(s, selectfdp))
#endif
rtsol_input(s);
}
/* NOTREACHED */
return (0);
}
int
ifconfig(char *ifname)
{
struct ifinfo *ifi;
struct sockaddr_dl *sdl;
int flags;
if ((sdl = if_nametosdl(ifname)) == NULL) {
warnmsg(LOG_ERR, __func__,
"failed to get link layer information for %s", ifname);
return (-1);
}
if (find_ifinfo(sdl->sdl_index)) {
warnmsg(LOG_ERR, __func__,
"interface %s was already configured", ifname);
free(sdl);
return (-1);
}
if (Fflag) {
struct in6_ndireq nd;
int s;
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
warnmsg(LOG_ERR, __func__, "socket() failed.");
return (-1);
}
memset(&nd, 0, sizeof(nd));
strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
warnmsg(LOG_ERR, __func__,
"cannot get accept_rtadv flag");
close(s);
return (-1);
}
nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) {
warnmsg(LOG_ERR, __func__,
"cannot set accept_rtadv flag");
close(s);
return (-1);
}
close(s);
}
if ((ifi = malloc(sizeof(*ifi))) == NULL) {
warnmsg(LOG_ERR, __func__, "memory allocation failed");
free(sdl);
return (-1);
}
memset(ifi, 0, sizeof(*ifi));
ifi->sdl = sdl;
ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO;
ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO;
TAILQ_INIT(&ifi->ifi_rainfo);
strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname));
/* construct a router solicitation message */
if (make_packet(ifi))
goto bad;
/* set link ID of this interface. */
#ifdef HAVE_SCOPELIB
if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid))
goto bad;
#else
/* XXX: assume interface IDs as link IDs */
ifi->linkid = ifi->sdl->sdl_index;
#endif
/*
* check if the interface is available.
* also check if SIOCGIFMEDIA ioctl is OK on the interface.
*/
ifi->mediareqok = 1;
ifi->active = interface_status(ifi);
if (!ifi->mediareqok) {
/*
* probe routers periodically even if the link status
* does not change.
*/
ifi->probeinterval = PROBE_INTERVAL;
}
/* activate interface: interface_up returns 0 on success */
flags = interface_up(ifi->ifname);
if (flags == 0)
ifi->state = IFS_DELAY;
else if (flags == IFS_TENTATIVE)
ifi->state = IFS_TENTATIVE;
else
ifi->state = IFS_DOWN;
rtsol_timer_update(ifi);
TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next);
return (0);
bad:
free(ifi->sdl);
free(ifi);
return (-1);
}
void
iflist_init(void)
{
struct ifinfo *ifi;
while ((ifi = TAILQ_FIRST(&ifinfo_head)) != NULL) {
TAILQ_REMOVE(&ifinfo_head, ifi, ifi_next);
if (ifi->sdl != NULL)
free(ifi->sdl);
if (ifi->rs_data != NULL)
free(ifi->rs_data);
free(ifi);
}
}
#if 0
static int
ifreconfig(char *ifname)
{
struct ifinfo *ifi, *prev;
int rv;
prev = NULL;
TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
if (strncmp(ifi->ifname, ifname, sizeof(ifi->ifname)) == 0)
break;
prev = ifi;
}
prev->next = ifi->next;
rv = ifconfig(ifname);
/* reclaim it after ifconfig() in case ifname is pointer inside ifi */
if (ifi->rs_data)
free(ifi->rs_data);
free(ifi->sdl);
free(ifi);
return (rv);
}
#endif
struct rainfo *
find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6)
{
struct rainfo *rai;
TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next)
if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr,
sizeof(rai->rai_saddr.sin6_addr)) == 0)
return (rai);
return (NULL);
}
struct ifinfo *
find_ifinfo(int ifindex)
{
struct ifinfo *ifi;
TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
if (ifi->sdl->sdl_index == ifindex)
return (ifi);
}
return (NULL);
}
static int
make_packet(struct ifinfo *ifi)
{
size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
struct nd_router_solicit *rs;
char *buf;
if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) {
warnmsg(LOG_INFO, __func__,
"link-layer address option has null length"
" on %s. Treat as not included.", ifi->ifname);
}
packlen += lladdroptlen;
ifi->rs_datalen = packlen;
/* allocate buffer */
if ((buf = malloc(packlen)) == NULL) {
warnmsg(LOG_ERR, __func__,
"memory allocation failed for %s", ifi->ifname);
return (-1);
}
ifi->rs_data = buf;
/* fill in the message */
rs = (struct nd_router_solicit *)buf;
rs->nd_rs_type = ND_ROUTER_SOLICIT;
rs->nd_rs_code = 0;
rs->nd_rs_cksum = 0;
rs->nd_rs_reserved = 0;
buf += sizeof(*rs);
/* fill in source link-layer address option */
if (lladdroptlen)
lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf);
return (0);
}
static struct timeval *
rtsol_check_timer(void)
{
static struct timeval returnval;
struct timeval now, rtsol_timer;
struct ifinfo *ifi;
struct rainfo *rai;
struct ra_opt *rao;
int flags;
gettimeofday(&now, NULL);
rtsol_timer = tm_max;
TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
if (timercmp(&ifi->expire, &now, <=)) {
warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, "
"state = %d", ifi->ifname, ifi->state);
while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) {
/* Remove all RA options. */
TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next);
while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) !=
NULL) {
TAILQ_REMOVE(&rai->rai_ra_opt, rao,
rao_next);
if (rao->rao_msg != NULL)
free(rao->rao_msg);
free(rao);
}
free(rai);
}
switch (ifi->state) {
case IFS_DOWN:
case IFS_TENTATIVE:
/* interface_up returns 0 on success */
flags = interface_up(ifi->ifname);
if (flags == 0)
ifi->state = IFS_DELAY;
else if (flags == IFS_TENTATIVE)
ifi->state = IFS_TENTATIVE;
else
ifi->state = IFS_DOWN;
break;
case IFS_IDLE:
{
int oldstatus = ifi->active;
int probe = 0;
ifi->active = interface_status(ifi);
if (oldstatus != ifi->active) {
warnmsg(LOG_DEBUG, __func__,
"%s status is changed"
" from %d to %d",
ifi->ifname,
oldstatus, ifi->active);
probe = 1;
ifi->state = IFS_DELAY;
} else if (ifi->probeinterval &&
(ifi->probetimer -=
ifi->timer.tv_sec) <= 0) {
/* probe timer expired */
ifi->probetimer =
ifi->probeinterval;
probe = 1;
ifi->state = IFS_PROBE;
}
/*
* If we need a probe, clear the previous
* status wrt the "other" configuration.
*/
if (probe)
ifi->otherconfig = 0;
if (probe && mobile_node)
defrouter_probe(ifi);
break;
}
case IFS_DELAY:
ifi->state = IFS_PROBE;
sendpacket(ifi);
break;
case IFS_PROBE:
if (ifi->probes < MAX_RTR_SOLICITATIONS)
sendpacket(ifi);
else {
warnmsg(LOG_INFO, __func__,
"No answer after sending %d RSs",
ifi->probes);
ifi->probes = 0;
ifi->state = IFS_IDLE;
}
break;
}
rtsol_timer_update(ifi);
} else {
/* Expiration check for RA options. */
int expire = 0;
TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) {
TAILQ_FOREACH(rao, &rai->rai_ra_opt, rao_next) {
warnmsg(LOG_DEBUG, __func__,
"RA expiration timer: "
"type=%d, msg=%s, expire=%s",
rao->rao_type, (char *)rao->rao_msg,
sec2str(&rao->rao_expire));
if (timercmp(&now, &rao->rao_expire,
>=)) {
warnmsg(LOG_DEBUG, __func__,
"RA expiration timer: "
"expired.");
TAILQ_REMOVE(&rai->rai_ra_opt,
rao, rao_next);
if (rao->rao_msg != NULL)
free(rao->rao_msg);
free(rao);
expire = 1;
}
}
}
if (expire)
ra_opt_handler(ifi);
}
if (timercmp(&ifi->expire, &rtsol_timer, <))
rtsol_timer = ifi->expire;
}
if (timercmp(&rtsol_timer, &tm_max, ==)) {
warnmsg(LOG_DEBUG, __func__, "there is no timer");
return (NULL);
} else if (timercmp(&rtsol_timer, &now, <))
/* this may occur when the interval is too small */
returnval.tv_sec = returnval.tv_usec = 0;
else
timersub(&rtsol_timer, &now, &returnval);
now.tv_sec += returnval.tv_sec;
now.tv_usec += returnval.tv_usec;
warnmsg(LOG_DEBUG, __func__, "New timer is %s",
sec2str(&now));
return (&returnval);
}
void
rtsol_timer_update(struct ifinfo *ifi)
{
#define MILLION 1000000
#define DADRETRY 10 /* XXX: adhoc */
long interval;
struct timeval now;
bzero(&ifi->timer, sizeof(ifi->timer));
switch (ifi->state) {
case IFS_DOWN:
case IFS_TENTATIVE:
if (++ifi->dadcount > DADRETRY) {
ifi->dadcount = 0;
ifi->timer.tv_sec = PROBE_INTERVAL;
} else
ifi->timer.tv_sec = 1;
break;
case IFS_IDLE:
if (mobile_node) {
/* XXX should be configurable */
ifi->timer.tv_sec = 3;
}
else
ifi->timer = tm_max; /* stop timer(valid?) */
break;
case IFS_DELAY:
#ifndef HAVE_ARC4RANDOM
interval = random() % (MAX_RTR_SOLICITATION_DELAY * MILLION);
#else
interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
#endif
ifi->timer.tv_sec = interval / MILLION;
ifi->timer.tv_usec = interval % MILLION;
break;
case IFS_PROBE:
if (ifi->probes < MAX_RTR_SOLICITATIONS)
ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
else {
/*
* After sending MAX_RTR_SOLICITATIONS solicitations,
* we're just waiting for possible replies; there
* will be no more solicitation. Thus, we change
* the timer value to MAX_RTR_SOLICITATION_DELAY based
* on RFC 2461, Section 6.3.7.
*/
ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
}
break;
default:
warnmsg(LOG_ERR, __func__,
"illegal interface state(%d) on %s",
ifi->state, ifi->ifname);
return;
}
/* reset the timer */
if (timercmp(&ifi->timer, &tm_max, ==)) {
ifi->expire = tm_max;
warnmsg(LOG_DEBUG, __func__,
"stop timer for %s", ifi->ifname);
} else {
gettimeofday(&now, NULL);
timeradd(&now, &ifi->timer, &ifi->expire);
now.tv_sec += ifi->timer.tv_sec;
now.tv_usec += ifi->timer.tv_usec;
warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s",
ifi->ifname, sec2str(&now));
}
#undef MILLION
}
/* timer related utility functions */
#define MILLION 1000000
#ifndef SMALL
static void
rtsold_set_dump_file(int sig __unused)
{
do_dump = 1;
}
#endif
static void
usage(void)
{
#ifndef SMALL
fprintf(stderr, "usage: rtsold [-adDfFm1] [-O script-name] "
"[-P pidfile] [-R script-name] interfaces...\n");
fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
"[-P pidfile] [-R script-name] -a\n");
#else
fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
"[-P pidfile] [-R script-name] interfaces...\n");
fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
"[-P pidfile] [-R script-name] -a\n");
#endif
}
void
warnmsg(int priority, const char *func, const char *msg, ...)
{
va_list ap;
char buf[BUFSIZ];
va_start(ap, msg);
if (fflag) {
if (priority <= log_upto) {
(void)vfprintf(stderr, msg, ap);
(void)fprintf(stderr, "\n");
}
} else {
snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
msg = buf;
vsyslog(priority, msg, ap);
}
va_end(ap);
}
/*
* return a list of interfaces which is suitable to sending an RS.
*/
char **
autoifprobe(void)
{
static char **argv = NULL;
static int n = 0;
char **a;
int s = 0, i, found;
struct ifaddrs *ifap, *ifa, *target;
struct in6_ndireq nd;
/* initialize */
while (n--)
free(argv[n]);
if (argv) {
free(argv);
argv = NULL;
}
n = 0;
if (getifaddrs(&ifap) != 0)
return (NULL);
if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
warnmsg(LOG_ERR, __func__, "socket");
exit(1);
}
target = NULL;
/* find an ethernet */
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if ((ifa->ifa_flags & IFF_UP) == 0)
continue;
if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0)
continue;
if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
continue;
if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
continue;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
found = 0;
for (i = 0; i < n; i++) {
if (strcmp(argv[i], ifa->ifa_name) == 0) {
found++;
break;
}
}
if (found)
continue;
/*
* Skip the interfaces which IPv6 and/or accepting RA
* is disabled.
*/
if (!Fflag) {
memset(&nd, 0, sizeof(nd));
strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname));
if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
warnmsg(LOG_ERR, __func__,
"ioctl(SIOCGIFINFO_IN6)");
exit(1);
}
if ((nd.ndi.flags & ND6_IFF_IFDISABLED))
continue;
if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV))
continue;
}
/* if we find multiple candidates, just warn. */
if (n != 0 && dflag > 1)
warnmsg(LOG_WARNING, __func__,
"multiple interfaces found");
a = (char **)realloc(argv, (n + 1) * sizeof(char **));
if (a == NULL) {
warnmsg(LOG_ERR, __func__, "realloc");
exit(1);
}
argv = a;
argv[n] = strdup(ifa->ifa_name);
if (!argv[n]) {
warnmsg(LOG_ERR, __func__, "malloc");
exit(1);
}
n++;
}
if (n) {
a = (char **)realloc(argv, (n + 1) * sizeof(char **));
if (a == NULL) {
warnmsg(LOG_ERR, __func__, "realloc");
exit(1);
}
argv = a;
argv[n] = NULL;
if (dflag > 0) {
for (i = 0; i < n; i++)
warnmsg(LOG_WARNING, __func__, "probing %s",
argv[i]);
}
}
if (!Fflag)
close(s);
freeifaddrs(ifap);
return (argv);
}