FreeBSD-5.3/usr.sbin/rrenumd/rrenumd.c
/* $KAME: rrenumd.c,v 1.20 2000/11/08 02:40:53 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: src/usr.sbin/rrenumd/rrenumd.c,v 1.7 2003/10/26 10:30:17 ume Exp $
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/time.h>
#include <string.h>
#include <net/route.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <arpa/inet.h>
#ifdef IPSEC
#include <netinet6/ipsec.h>
#endif
#include <stdio.h>
#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include "rrenumd.h"
#define LL_ALLROUTERS "ff02::2"
#define SL_ALLROUTERS "ff05::2"
#define RR_MCHLIM_DEFAULT 64
#ifndef IN6_IS_SCOPE_LINKLOCAL
#define IN6_IS_SCOPE_LINKLOCAL(a) \
((IN6_IS_ADDR_LINKLOCAL(a)) || \
(IN6_IS_ADDR_MC_LINKLOCAL(a)))
#endif /* IN6_IS_SCOPE_LINKLOCAL */
struct flags {
u_long debug : 1;
u_long fg : 1;
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
u_long policy : 1;
#else /* IPSEC_POLICY_IPSEC */
u_long auth : 1;
u_long encrypt : 1;
#endif /* IPSEC_POLICY_IPSEC */
#endif /*IPSEC*/
};
struct msghdr sndmhdr;
struct msghdr rcvmhdr;
struct sockaddr_in6 from;
struct sockaddr_in6 sin6_ll_allrouters;
int s4, s6;
int with_v4dest, with_v6dest;
struct in6_addr prefix; /* ADHOC */
int prefixlen = 64; /* ADHOC */
extern int parse __P((FILE **));
static void show_usage __P((void));
static void init_sin6 __P((struct sockaddr_in6 *, const char *));
#if 0
static void join_multi __P((const char *));
#endif
static void init_globals __P((void));
static void config __P((FILE **));
#ifdef IPSEC_POLICY_IPSEC
static void sock6_open __P((struct flags *, char *));
static void sock4_open __P((struct flags *, char *));
#else
static void sock6_open __P((struct flags *));
static void sock4_open __P((struct flags *));
#endif
static void rrenum_output __P((struct payload_list *, struct dst_list *));
static void rrenum_snd_eachdst __P((struct payload_list *));
#if 0
static void rrenum_snd_fullsequence __P((void));
#endif
static void rrenum_input __P((int));
int main __P((int, char *[]));
/* Print usage. Don't call this after daemonized. */
static void
show_usage()
{
fprintf(stderr, "usage: rrenumd [-c conf_file|-s] [-df"
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
"] [-P policy"
#else /* IPSEC_POLICY_IPSEC */
"AE"
#endif /* IPSEC_POLICY_IPSEC */
#endif /* IPSEC */
"]\n");
exit(1);
}
static void
init_sin6(struct sockaddr_in6 *sin6, const char *addr_ascii)
{
memset(sin6, 0, sizeof(*sin6));
sin6->sin6_len = sizeof(*sin6);
sin6->sin6_family = AF_INET6;
if (inet_pton(AF_INET6, addr_ascii, &sin6->sin6_addr) != 1)
; /* XXX do something */
}
#if 0 /* XXX: not necessary ?? */
static void
join_multi(const char *addrname)
{
struct ipv6_mreq mreq;
if (inet_pton(AF_INET6, addrname, &mreq.ipv6mr_multiaddr.s6_addr)
!= 1) {
syslog(LOG_ERR, "<%s> inet_pton failed(library bug?)",
__FUNCTION__);
exit(1);
}
/* ADHOC: currently join only one */
{
if ((mreq.ipv6mr_interface = if_nametoindex(ifname)) == 0) {
syslog(LOG_ERR, "<%s> ifname %s should be invalid: %s",
__FUNCTION__, ifname, strerror(errno));
exit(1);
}
if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP,
&mreq,
sizeof(mreq)) < 0) {
syslog(LOG_ERR, "<%s> IPV6_JOIN_GROUP on %s: %s",
__FUNCTION__, ifname, strerror(errno));
exit(1);
}
}
}
#endif
static void
init_globals()
{
static struct iovec rcviov;
static u_char rprdata[4500]; /* maximal MTU of connected links */
static u_char *rcvcmsgbuf = NULL;
static u_char *sndcmsgbuf = NULL;
int sndcmsglen, rcvcmsglen;
/* init ll_allrouters */
init_sin6(&sin6_ll_allrouters, LL_ALLROUTERS);
/* initialize msghdr for receiving packets */
rcviov.iov_base = (caddr_t)rprdata;
rcviov.iov_len = sizeof(rprdata);
rcvmhdr.msg_namelen = sizeof(struct sockaddr_in6);
rcvmhdr.msg_iov = &rcviov;
rcvmhdr.msg_iovlen = 1;
rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
CMSG_SPACE(sizeof(int));
if (rcvcmsgbuf == NULL &&
(rcvcmsgbuf = (u_char *)malloc(rcvcmsglen)) == NULL) {
syslog(LOG_ERR, "<%s>: malloc failed", __FUNCTION__);
exit(1);
}
rcvmhdr.msg_control = (caddr_t)rcvcmsgbuf;
rcvmhdr.msg_controllen = rcvcmsglen;
/* initialize msghdr for sending packets */
sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
sndmhdr.msg_iovlen = 1;
sndcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
CMSG_SPACE(sizeof(int));
if (sndcmsgbuf == NULL &&
(sndcmsgbuf = (u_char *)malloc(sndcmsglen)) == NULL) {
syslog(LOG_ERR, "<%s>: malloc failed", __FUNCTION__);
exit(1);
}
sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
sndmhdr.msg_controllen = sndcmsglen;
}
static void
config(FILE **fpp)
{
struct payload_list *pl;
struct iovec *iov;
struct icmp6_router_renum *irr;
struct rr_pco_match *rpm;
if (parse(fpp) < 0) {
syslog(LOG_ERR, "<%s> parse failed", __FUNCTION__);
exit(1);
}
/* initialize fields not configured by parser */
for (pl = pl_head; pl; pl = pl->pl_next) {
iov = (struct iovec *)&pl->pl_sndiov;
irr = (struct icmp6_router_renum *)&pl->pl_irr;
rpm = (struct rr_pco_match *)&pl->pl_rpm;
irr->rr_type = ICMP6_ROUTER_RENUMBERING;
irr->rr_code = 0;
/*
* now we don't support multiple PCOs in a rr message.
* so segment number is not supported.
*/
/* TODO: rr flags config in parser */
irr->rr_flags |= ICMP6_RR_FLAGS_SPECSITE;
/* TODO: max delay config in parser */
/*
* means only 1 use_prefix is contained as router-renum-05.txt.
* now we don't support multiple PCOs in a rr message,
* nor multiple use_prefix in one PCO.
*/
rpm->rpm_len = 4*1 +3;
rpm->rpm_ordinal = 0;
iov->iov_base = (caddr_t)irr;
iov->iov_len = sizeof(struct icmp6_router_renum)
+ sizeof(struct rr_pco_match)
+ sizeof(struct rr_pco_use);
}
}
static void
sock6_open(struct flags *flags
#ifdef IPSEC_POLICY_IPSEC
, char *policy
#endif /* IPSEC_POLICY_IPSEC */
)
{
struct icmp6_filter filt;
int on;
#ifdef IPSEC
#ifndef IPSEC_POLICY_IPSEC
int optval;
#endif
#endif
if (with_v6dest == 0)
return;
if (with_v6dest &&
(s6 = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
syslog(LOG_ERR, "<%s> socket(v6): %s", __FUNCTION__,
strerror(errno));
exit(1);
}
/*
* join all routers multicast addresses.
*/
#if 0 /* XXX: not necessary ?? */
join_multi(LL_ALLROUTERS);
join_multi(SL_ALLROUTERS);
#endif
/* set icmpv6 filter */
ICMP6_FILTER_SETBLOCKALL(&filt);
ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt);
if (setsockopt(s6, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
sizeof(filt)) < 0) {
syslog(LOG_ERR, "<%s> IICMP6_FILTER: %s",
__FUNCTION__, strerror(errno));
exit(1);
}
/* specify to tell receiving interface */
on = 1;
if (setsockopt(s6, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
sizeof(on)) < 0) {
syslog(LOG_ERR, "<%s> IPV6_RECVPKTINFO: %s",
__FUNCTION__, strerror(errno));
exit(1);
}
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
if (flags->policy) {
char *buf;
buf = ipsec_set_policy(policy, strlen(policy));
if (buf == NULL)
errx(1, "%s", ipsec_strerror());
/* XXX should handle in/out bound policy. */
if (setsockopt(s6, IPPROTO_IPV6, IPV6_IPSEC_POLICY,
buf, ipsec_get_policylen(buf)) < 0)
err(1, "setsockopt(IPV6_IPSEC_POLICY)");
free(buf);
}
#else /* IPSEC_POLICY_IPSEC */
if (flags->auth) {
optval = IPSEC_LEVEL_REQUIRE;
if (setsockopt(s6, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL,
&optval, sizeof(optval)) == -1) {
syslog(LOG_ERR, "<%s> IPV6_AUTH_TRANS_LEVEL: %s",
__FUNCTION__, strerror(errno));
exit(1);
}
}
if (flags->encrypt) {
optval = IPSEC_LEVEL_REQUIRE;
if (setsockopt(s6, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL,
&optval, sizeof(optval)) == -1) {
syslog(LOG_ERR, "<%s> IPV6_ESP_TRANS_LEVEL: %s",
__FUNCTION__, strerror(errno));
exit(1);
}
}
#endif /* IPSEC_POLICY_IPSEC */
#endif /* IPSEC */
return;
}
static void
sock4_open(struct flags *flags
#ifdef IPSEC_POLICY_IPSEC
, char *policy
#endif /* IPSEC_POLICY_IPSEC */
)
{
#ifdef IPSEC
#ifndef IPSEC_POLICY_IPSEC
int optval;
#endif
#endif
if (with_v4dest == 0)
return;
if ((s4 = socket(AF_INET, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
syslog(LOG_ERR, "<%s> socket(v4): %s", __FUNCTION__,
strerror(errno));
exit(1);
}
#if 0 /* XXX: not necessary ?? */
/*
* join all routers multicast addresses.
*/
some_join_function();
#endif
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
if (flags->policy) {
char *buf;
buf = ipsec_set_policy(policy, strlen(policy));
if (buf == NULL)
errx(1, "%s", ipsec_strerror());
/* XXX should handle in/out bound policy. */
if (setsockopt(s4, IPPROTO_IP, IP_IPSEC_POLICY,
buf, ipsec_get_policylen(buf)) < 0)
err(1, "setsockopt(IP_IPSEC_POLICY)");
free(buf);
}
#else /* IPSEC_POLICY_IPSEC */
if (flags->auth) {
optval = IPSEC_LEVEL_REQUIRE;
if (setsockopt(s4, IPPROTO_IP, IP_AUTH_TRANS_LEVEL,
&optval, sizeof(optval)) == -1) {
syslog(LOG_ERR, "<%s> IP_AUTH_TRANS_LEVEL: %s",
__FUNCTION__, strerror(errno));
exit(1);
}
}
if (flags->encrypt) {
optval = IPSEC_LEVEL_REQUIRE;
if (setsockopt(s4, IPPROTO_IP, IP_ESP_TRANS_LEVEL,
&optval, sizeof(optval)) == -1) {
syslog(LOG_ERR, "<%s> IP_ESP_TRANS_LEVEL: %s",
__FUNCTION__, strerror(errno));
exit(1);
}
}
#endif /* IPSEC_POLICY_IPSEC */
#endif /* IPSEC */
return;
}
static void
rrenum_output(struct payload_list *pl, struct dst_list *dl)
{
int i, msglen = 0;
struct cmsghdr *cm;
struct in6_pktinfo *pi;
struct sockaddr_in6 *sin6 = NULL;
sndmhdr.msg_name = (caddr_t)dl->dl_dst;
if (dl->dl_dst->sa_family == AF_INET6)
sin6 = (struct sockaddr_in6 *)dl->dl_dst;
if (sin6 != NULL &&
IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
int hoplimit = RR_MCHLIM_DEFAULT;
cm = CMSG_FIRSTHDR(&sndmhdr);
/* specify the outgoing interface */
cm->cmsg_level = IPPROTO_IPV6;
cm->cmsg_type = IPV6_PKTINFO;
cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
pi = (struct in6_pktinfo *)CMSG_DATA(cm);
memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
pi->ipi6_ifindex = sin6->sin6_scope_id;
msglen += CMSG_LEN(sizeof(struct in6_pktinfo));
/* specify the hop limit of the packet if dest is link local */
/* not defined by router-renum-05.txt, but maybe its OK */
cm = CMSG_NXTHDR(&sndmhdr, cm);
cm->cmsg_level = IPPROTO_IPV6;
cm->cmsg_type = IPV6_HOPLIMIT;
cm->cmsg_len = CMSG_LEN(sizeof(int));
memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
msglen += CMSG_LEN(sizeof(int));
}
sndmhdr.msg_controllen = msglen;
if (sndmhdr.msg_controllen == 0)
sndmhdr.msg_control = 0;
sndmhdr.msg_iov = &pl->pl_sndiov;
i = sendmsg(dl->dl_dst->sa_family == AF_INET ? s4 : s6, &sndmhdr, 0);
if (i < 0 || i != sndmhdr.msg_iov->iov_len)
syslog(LOG_ERR, "<%s> sendmsg: %s", __FUNCTION__,
strerror(errno));
}
static void
rrenum_snd_eachdst(struct payload_list *pl)
{
struct dst_list *dl;
for (dl = dl_head; dl; dl = dl->dl_next) {
rrenum_output(pl, dl);
}
}
#if 0
static void
rrenum_snd_fullsequence()
{
struct payload_list *pl;
for (pl = pl_head; pl; pl = pl->pl_next) {
rrenum_snd_eachdst(pl);
}
}
#endif
static void
rrenum_input(int s)
{
int i;
struct icmp6_router_renum *rr;
/* get message */
if ((i = recvmsg(s, &rcvmhdr, 0)) < 0) {
syslog(LOG_ERR, "<%s> recvmsg: %s", __FUNCTION__,
strerror(errno));
return;
}
if (s == s4)
i -= sizeof(struct ip);
if (i < sizeof(struct icmp6_router_renum)) {
syslog(LOG_ERR, "<%s> packet size(%d) is too short",
__FUNCTION__, i);
return;
}
if (s == s4) {
struct ip *ip = (struct ip *)rcvmhdr.msg_iov->iov_base;
rr = (struct icmp6_router_renum *)(ip + 1);
} else /* s == s6 */
rr = (struct icmp6_router_renum *)rcvmhdr.msg_iov->iov_base;
switch(rr->rr_code) {
case ICMP6_ROUTER_RENUMBERING_COMMAND:
/* COMMAND will be processed by rtadvd */
break;
case ICMP6_ROUTER_RENUMBERING_RESULT:
/* TODO: receiving result message */
break;
default:
syslog(LOG_ERR, "<%s> received unknown code %d",
__FUNCTION__, rr->rr_code);
break;
}
}
int
main(int argc, char *argv[])
{
FILE *fp = stdin;
fd_set fdset;
struct timeval timeout;
int ch, i, maxfd = 0, send_counter = 0;
struct flags flags;
struct payload_list *pl;
#ifdef IPSEC_POLICY_IPSEC
char *policy = NULL;
#endif
memset(&flags, 0, sizeof(flags));
openlog("rrenumd", LOG_PID, LOG_DAEMON);
/* get options */
while ((ch = getopt(argc, argv, "c:sdf"
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
"P:"
#else /* IPSEC_POLICY_IPSEC */
"AE"
#endif /* IPSEC_POLICY_IPSEC */
#endif /* IPSEC */
)) != -1){
switch (ch) {
case 'c':
if((fp = fopen(optarg, "r")) == NULL) {
syslog(LOG_ERR,
"<%s> config file %s open failed",
__FUNCTION__, optarg);
exit(1);
}
break;
case 's':
fp = stdin;
break;
case 'd':
flags.debug = 1;
break;
case 'f':
flags.fg = 1;
break;
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
case 'P':
flags.policy = 1;
policy = strdup(optarg);
break;
#else /* IPSEC_POLICY_IPSEC */
case 'A':
flags.auth = 1;
break;
case 'E':
flags.encrypt = 1;
break;
#endif /* IPSEC_POLICY_IPSEC */
#endif /*IPSEC*/
default:
show_usage();
}
}
argc -= optind;
argv += optind;
/* set log level */
if (flags.debug == 0)
(void)setlogmask(LOG_UPTO(LOG_ERR));
if (flags.debug == 1)
(void)setlogmask(LOG_UPTO(LOG_INFO));
/* init global variables */
init_globals();
config(&fp);
sock6_open(&flags
#ifdef IPSEC_POLICY_IPSEC
, policy
#endif /* IPSEC_POLICY_IPSEC */
);
sock4_open(&flags
#ifdef IPSEC_POLICY_IPSEC
, policy
#endif /* IPSEC_POLICY_IPSEC */
);
if (!flags.fg)
daemon(0, 0);
FD_ZERO(&fdset);
if (with_v6dest) {
FD_SET(s6, &fdset);
if (s6 > maxfd)
maxfd = s6;
}
if (with_v4dest) {
FD_SET(s4, &fdset);
if (s4 > maxfd)
maxfd = s4;
}
/* ADHOC: timeout each 30seconds */
memset(&timeout, 0, sizeof(timeout));
/* init temporary payload_list and send_counter*/
pl = pl_head;
send_counter = retry + 1;
while (1) {
struct fd_set select_fd = fdset; /* reinitialize */
if ((i = select(maxfd + 1, &select_fd, NULL, NULL,
&timeout)) < 0){
syslog(LOG_ERR, "<%s> select: %s",
__FUNCTION__, strerror(errno));
continue;
}
if (i == 0) { /* timeout */
if (pl == NULL)
exit(0);
rrenum_snd_eachdst(pl);
send_counter--;
timeout.tv_sec = 30;
if (send_counter == 0) {
timeout.tv_sec = 0;
pl = pl->pl_next;
send_counter = retry + 1;
}
}
if (FD_ISSET(s4, &select_fd))
rrenum_input(s4);
if (FD_ISSET(s6, &select_fd))
rrenum_input(s6);
}
}