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NetBSD/crypto/dist/kame/racoon/sockmisc.c

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/* $KAME: sockmisc.c,v 1.28 2001/04/03 15:51:57 thorpej 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.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <netinet/in.h>
#ifdef IPV6_INRIA_VERSION
#include <netinet/ipsec.h>
#define IPV6_RECVDSTADDR IP_RECVDSTADDR
#else
#include <netinet6/ipsec.h>
#endif
#include <netkey/key_var.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "var.h"
#include "misc.h"
#include "plog.h"
#include "sockmisc.h"
#include "debug.h"
#include "gcmalloc.h"
#ifdef NI_WITHSCOPEID
const int niflags = NI_WITHSCOPEID;
#else
const int niflags = 0;
#endif
/*
* compare two sockaddr without port number.
* OUT: 0: equal.
* 1: not equal.
*/
int
cmpsaddrwop(addr1, addr2)
struct sockaddr *addr1;
struct sockaddr *addr2;
{
caddr_t sa1, sa2;
if (addr1 == 0 && addr2 == 0)
return 0;
if (addr1 == 0 || addr2 == 0)
return 1;
if (addr1->sa_len != addr2->sa_len
|| addr1->sa_family != addr2->sa_family)
return 1;
switch (addr1->sa_family) {
case AF_INET:
sa1 = (caddr_t)&((struct sockaddr_in *)addr1)->sin_addr;
sa2 = (caddr_t)&((struct sockaddr_in *)addr2)->sin_addr;
if (memcmp(sa1, sa2, sizeof(struct in_addr)) != 0)
return 1;
break;
#ifdef INET6
case AF_INET6:
sa1 = (caddr_t)&((struct sockaddr_in6 *)addr1)->sin6_addr;
sa2 = (caddr_t)&((struct sockaddr_in6 *)addr2)->sin6_addr;
if (memcmp(sa1, sa2, sizeof(struct in6_addr)) != 0)
return 1;
if (((struct sockaddr_in6 *)addr1)->sin6_scope_id !=
((struct sockaddr_in6 *)addr2)->sin6_scope_id)
return 1;
break;
#endif
default:
return 1;
}
return 0;
}
/*
* compare two sockaddr with port, taking care wildcard.
* OUT: 0: equal.
* 1: not equal.
*/
int
cmpsaddrwild(addr1, addr2)
struct sockaddr *addr1;
struct sockaddr *addr2;
{
caddr_t sa1, sa2;
u_short port1, port2;
if (addr1 == 0 && addr2 == 0)
return 0;
if (addr1 == 0 || addr2 == 0)
return 1;
if (addr1->sa_len != addr2->sa_len
|| addr1->sa_family != addr2->sa_family)
return 1;
switch (addr1->sa_family) {
case AF_INET:
sa1 = (caddr_t)&((struct sockaddr_in *)addr1)->sin_addr;
sa2 = (caddr_t)&((struct sockaddr_in *)addr2)->sin_addr;
port1 = ((struct sockaddr_in *)addr1)->sin_port;
port2 = ((struct sockaddr_in *)addr2)->sin_port;
if (!(port1 == 0 || port2 == 0 || port1 == port2))
return 1;
if (memcmp(sa1, sa2, sizeof(struct in_addr)) != 0)
return 1;
break;
#ifdef INET6
case AF_INET6:
sa1 = (caddr_t)&((struct sockaddr_in6 *)addr1)->sin6_addr;
sa2 = (caddr_t)&((struct sockaddr_in6 *)addr2)->sin6_addr;
port1 = ((struct sockaddr_in6 *)addr1)->sin6_port;
port2 = ((struct sockaddr_in6 *)addr2)->sin6_port;
if (!(port1 == 0 || port2 == 0 || port1 == port2))
return 1;
if (memcmp(sa1, sa2, sizeof(struct in6_addr)) != 0)
return 1;
if (((struct sockaddr_in6 *)addr1)->sin6_scope_id !=
((struct sockaddr_in6 *)addr2)->sin6_scope_id)
return 1;
break;
#endif
default:
return 1;
}
return 0;
}
/*
* compare two sockaddr with strict match on port.
* OUT: 0: equal.
* 1: not equal.
*/
int
cmpsaddrstrict(addr1, addr2)
struct sockaddr *addr1;
struct sockaddr *addr2;
{
caddr_t sa1, sa2;
u_short port1, port2;
if (addr1 == 0 && addr2 == 0)
return 0;
if (addr1 == 0 || addr2 == 0)
return 1;
if (addr1->sa_len != addr2->sa_len
|| addr1->sa_family != addr2->sa_family)
return 1;
switch (addr1->sa_family) {
case AF_INET:
sa1 = (caddr_t)&((struct sockaddr_in *)addr1)->sin_addr;
sa2 = (caddr_t)&((struct sockaddr_in *)addr2)->sin_addr;
port1 = ((struct sockaddr_in *)addr1)->sin_port;
port2 = ((struct sockaddr_in *)addr2)->sin_port;
if (port1 != port2)
return 1;
if (memcmp(sa1, sa2, sizeof(struct in_addr)) != 0)
return 1;
break;
#ifdef INET6
case AF_INET6:
sa1 = (caddr_t)&((struct sockaddr_in6 *)addr1)->sin6_addr;
sa2 = (caddr_t)&((struct sockaddr_in6 *)addr2)->sin6_addr;
port1 = ((struct sockaddr_in6 *)addr1)->sin6_port;
port2 = ((struct sockaddr_in6 *)addr2)->sin6_port;
if (port1 != port2)
return 1;
if (memcmp(sa1, sa2, sizeof(struct in6_addr)) != 0)
return 1;
if (((struct sockaddr_in6 *)addr1)->sin6_scope_id !=
((struct sockaddr_in6 *)addr2)->sin6_scope_id)
return 1;
break;
#endif
default:
return 1;
}
return 0;
}
/* get local address against the destination. */
struct sockaddr *
getlocaladdr(remote)
struct sockaddr *remote;
{
struct sockaddr *local;
int local_len = sizeof(struct sockaddr_storage);
int s; /* for dummy connection */
/* allocate buffer */
if ((local = racoon_calloc(1, local_len)) == NULL) {
plog(LLV_ERROR, LOCATION, NULL,
"failed to get address buffer.\n");
goto err;
}
/* get real interface received packet */
if ((s = socket(remote->sa_family, SOCK_DGRAM, 0)) < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"socket (%s)\n", strerror(errno));
goto err;
}
if (connect(s, remote, remote->sa_len) < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"connect (%s)\n", strerror(errno));
close(s);
goto err;
}
if (getsockname(s, local, &local_len) < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"getsockname (%s)\n", strerror(errno));
close(s);
return NULL;
}
close(s);
return local;
err:
if (local != NULL)
racoon_free(local);
return NULL;
}
/*
* Receive packet, with src/dst information. It is assumed that necessary
* setsockopt() have already performed on socket.
*/
int
recvfromto(s, buf, buflen, flags, from, fromlen, to, tolen)
int s;
void *buf;
size_t buflen;
int flags;
struct sockaddr *from;
int *fromlen;
struct sockaddr *to;
int *tolen;
{
int otolen;
int len;
struct sockaddr_storage ss;
struct msghdr m;
struct cmsghdr *cm;
struct iovec iov[2];
u_char cmsgbuf[256];
#if defined(INET6) && defined(ADVAPI)
struct in6_pktinfo *pi;
#endif /*ADVAPI*/
struct sockaddr_in *sin;
#ifdef INET6
struct sockaddr_in6 *sin6;
#endif
len = sizeof(ss);
if (getsockname(s, (struct sockaddr *)&ss, &len) < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"getsockname (%s)\n", strerror(errno));
return -1;
}
m.msg_name = (caddr_t)from;
m.msg_namelen = *fromlen;
iov[0].iov_base = (caddr_t)buf;
iov[0].iov_len = buflen;
m.msg_iov = iov;
m.msg_iovlen = 1;
memset(cmsgbuf, 0, sizeof(cmsgbuf));
cm = (struct cmsghdr *)cmsgbuf;
m.msg_control = (caddr_t)cm;
m.msg_controllen = sizeof(cmsgbuf);
if ((len = recvmsg(s, &m, flags)) < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"recvmsg (%s)\n", strerror(errno));
return -1;
}
*fromlen = m.msg_namelen;
otolen = *tolen;
*tolen = 0;
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
m.msg_controllen != 0 && cm;
cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
#if 0
plog(LLV_ERROR, LOCATION, NULL,
"cmsg %d %d\n", cm->cmsg_level, cm->cmsg_type);)
#endif
#if defined(INET6) && defined(ADVAPI)
if (ss.ss_family == AF_INET6
&& cm->cmsg_level == IPPROTO_IPV6
&& cm->cmsg_type == IPV6_PKTINFO
&& otolen >= sizeof(*sin6)) {
pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
*tolen = sizeof(*sin6);
sin6 = (struct sockaddr_in6 *)to;
memset(sin6, 0, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(*sin6);
memcpy(&sin6->sin6_addr, &pi->ipi6_addr,
sizeof(sin6->sin6_addr));
/* XXX other cases, such as site-local? */
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
sin6->sin6_scope_id = pi->ipi6_ifindex;
else
sin6->sin6_scope_id = 0;
sin6->sin6_port =
((struct sockaddr_in6 *)&ss)->sin6_port;
otolen = -1; /* "to" already set */
continue;
}
#endif
#if defined(INET6) && defined(IPV6_RECVDSTADDR)
if (ss.ss_family == AF_INET6
&& cm->cmsg_level == IPPROTO_IPV6
&& cm->cmsg_type == IPV6_RECVDSTADDR
&& otolen >= sizeof(*sin6)) {
*tolen = sizeof(*sin6);
sin6 = (struct sockaddr_in6 *)to;
memset(sin6, 0, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(*sin6);
memcpy(&sin6->sin6_addr, CMSG_DATA(cm),
sizeof(sin6->sin6_addr));
sin6->sin6_port =
((struct sockaddr_in6 *)&ss)->sin6_port;
otolen = -1; /* "to" already set */
continue;
}
#endif
if (ss.ss_family == AF_INET
&& cm->cmsg_level == IPPROTO_IP
&& cm->cmsg_type == IP_RECVDSTADDR
&& otolen >= sizeof(*sin)) {
*tolen = sizeof(*sin);
sin = (struct sockaddr_in *)to;
memset(sin, 0, sizeof(*sin));
sin->sin_family = AF_INET;
sin->sin_len = sizeof(*sin);
memcpy(&sin->sin_addr, CMSG_DATA(cm),
sizeof(sin->sin_addr));
sin->sin_port = ((struct sockaddr_in *)&ss)->sin_port;
otolen = -1; /* "to" already set */
continue;
}
}
return len;
}
/* send packet, with fixing src/dst address pair. */
int
sendfromto(s, buf, buflen, src, dst)
int s;
const void *buf;
size_t buflen;
struct sockaddr *src;
struct sockaddr *dst;
{
struct sockaddr_storage ss;
int len;
if (src->sa_family != dst->sa_family) {
plog(LLV_ERROR, LOCATION, NULL,
"address family mismatch\n");
return -1;
}
len = sizeof(ss);
if (getsockname(s, (struct sockaddr *)&ss, &len) < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"getsockname (%s)\n", strerror(errno));
return -1;
}
plog(LLV_DEBUG, LOCATION, NULL,
"sockname %s\n", saddr2str((struct sockaddr *)&ss));
plog(LLV_DEBUG, LOCATION, NULL,
"send packet from %s\n", saddr2str(src));
plog(LLV_DEBUG, LOCATION, NULL,
"send packet to %s\n", saddr2str(dst));
if (src->sa_family != ss.ss_family) {
plog(LLV_ERROR, LOCATION, NULL,
"address family mismatch\n");
return -1;
}
switch (src->sa_family) {
#if defined(INET6) && defined(ADVAPI) && !defined(IPV6_INRIA_VERSION)
case AF_INET6:
{
struct msghdr m;
struct cmsghdr *cm;
struct iovec iov[2];
u_char cmsgbuf[256];
struct in6_pktinfo *pi;
int ifindex;
struct sockaddr_in6 src6, dst6;
memcpy(&src6, src, sizeof(src6));
memcpy(&dst6, dst, sizeof(dst6));
/* XXX take care of other cases, such as site-local */
ifindex = 0;
if (IN6_IS_ADDR_LINKLOCAL(&src6.sin6_addr)
|| IN6_IS_ADDR_MULTICAST(&src6.sin6_addr)) {
ifindex = src6.sin6_scope_id; /*???*/
}
/* XXX some sanity check on dst6.sin6_scope_id */
/* flowinfo for IKE? mmm, maybe useful but for now make it 0 */
src6.sin6_flowinfo = dst6.sin6_flowinfo = 0;
memset(&m, 0, sizeof(m));
m.msg_name = (caddr_t)&dst6;
m.msg_namelen = sizeof(dst6);
iov[0].iov_base = (char *)buf;
iov[0].iov_len = buflen;
m.msg_iov = iov;
m.msg_iovlen = 1;
memset(cmsgbuf, 0, sizeof(cmsgbuf));
cm = (struct cmsghdr *)cmsgbuf;
m.msg_control = (caddr_t)cm;
m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
cm->cmsg_level = IPPROTO_IPV6;
cm->cmsg_type = IPV6_PKTINFO;
pi = (struct in6_pktinfo *)CMSG_DATA(cm);
memcpy(&pi->ipi6_addr, &src6.sin6_addr, sizeof(src6.sin6_addr));
pi->ipi6_ifindex = ifindex;
plog(LLV_DEBUG, LOCATION, NULL,
"src6 %s %d\n",
saddr2str((struct sockaddr *)&src6),
src6.sin6_scope_id);
plog(LLV_DEBUG, LOCATION, NULL,
"dst6 %s %d\n",
saddr2str((struct sockaddr *)&dst6),
dst6.sin6_scope_id);
len = sendmsg(s, &m, 0 /*MSG_DONTROUTE*/);
if (len < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"sendmsg (%s)\n", strerror(errno));
return -1;
}
return len;
}
#endif
default:
{
int needclose = 0;
int sendsock;
if (ss.ss_family == src->sa_family && memcmp(&ss, src, src->sa_len) == 0) {
sendsock = s;
needclose = 0;
} else {
int yes = 1;
/*
* Use newly opened socket for sending packets.
* NOTE: this is unsafe, because if the peer is quick enough
* the packet from the peer may be queued into sendsock.
* Better approach is to prepare bind'ed udp sockets for
* each of the interface addresses.
*/
sendsock = socket(src->sa_family, SOCK_DGRAM, 0);
if (sendsock < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"socket (%s)\n", strerror(errno));
return -1;
}
if (setsockopt(sendsock, SOL_SOCKET, SO_REUSEPORT,
(void *)&yes, sizeof(yes)) < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"setsockopt (%s)\n", strerror(errno));
return -1;
}
#ifdef IPV6_USE_MIN_MTU
if (src->sa_family == AF_INET6 &&
setsockopt(sendsock, IPPROTO_IPV6, IPV6_USE_MIN_MTU,
(void *)&yes, sizeof(yes)) < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"setsockopt (%s)\n", strerror(errno));
return -1;
}
#endif
if (setsockopt_bypass(sendsock, src->sa_family) < 0)
return -1;
if (bind(sendsock, (struct sockaddr *)src, src->sa_len) < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"bind 1 (%s)\n", strerror(errno));
return -1;
}
needclose = 1;
}
len = sendto(sendsock, buf, buflen, 0, dst, dst->sa_len);
if (len < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"sendto (%s)\n", strerror(errno));
return len;
}
if (needclose)
close(sendsock);
return len;
}
}
}
int
setsockopt_bypass(so, family)
int so, family;
{
int level;
char *buf, *policy;
switch (family) {
case AF_INET:
level = IPPROTO_IP;
break;
#ifdef INET6
case AF_INET6:
level = IPPROTO_IPV6;
break;
#endif
default:
plog(LLV_ERROR, LOCATION, NULL,
"unsupported address family %d\n", family);
return -1;
}
policy = "in bypass";
buf = ipsec_set_policy(policy, strlen(policy));
if (buf == NULL) {
plog(LLV_ERROR, LOCATION, NULL,
"ipsec_set_policy (%s)\n",
ipsec_strerror());
return -1;
}
if (setsockopt(so, level,
(level == IPPROTO_IP ?
IP_IPSEC_POLICY : IPV6_IPSEC_POLICY),
buf, ipsec_get_policylen(buf)) < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"setsockopt (%s)\n",
strerror(errno));
return -1;
}
racoon_free(buf);
policy = "out bypass";
buf = ipsec_set_policy(policy, strlen(policy));
if (buf == NULL) {
plog(LLV_ERROR, LOCATION, NULL,
"ipsec_set_policy (%s)\n",
ipsec_strerror());
return -1;
}
if (setsockopt(so, level,
(level == IPPROTO_IP ?
IP_IPSEC_POLICY : IPV6_IPSEC_POLICY),
buf, ipsec_get_policylen(buf)) < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"setsockopt (%s)\n",
strerror(errno));
return -1;
}
racoon_free(buf);
return 0;
}
struct sockaddr *
newsaddr(len)
int len;
{
struct sockaddr *new;
new = racoon_calloc(1, len);
if (new == NULL)
plog(LLV_ERROR, LOCATION, NULL,
"%s\n", strerror(errno));
/* initial */
new->sa_len = len;
return new;
}
struct sockaddr *
dupsaddr(src)
struct sockaddr *src;
{
struct sockaddr *dst;
dst = racoon_calloc(1, src->sa_len);
if (dst == NULL) {
plog(LLV_ERROR, LOCATION, NULL,
"%s\n", strerror(errno));
return NULL;
}
memcpy(dst, src, src->sa_len);
return dst;
}
char *
saddr2str(saddr)
struct sockaddr *saddr;
{
static char buf[NI_MAXHOST + NI_MAXSERV + 10];
char addr[NI_MAXHOST], port[NI_MAXSERV];
if (saddr == NULL)
return NULL;
GETNAMEINFO(saddr, addr, port);
snprintf(buf, sizeof(buf), "%s[%s]", addr, port);
return buf;
}
char *
saddrwop2str(saddr)
struct sockaddr *saddr;
{
static char buf[NI_MAXHOST + NI_MAXSERV + 10];
char addr[NI_MAXHOST];
if (saddr == NULL)
return NULL;
GETNAMEINFO(saddr, addr, NULL);
snprintf(buf, sizeof(buf), "%s", addr);
return buf;
}
struct sockaddr *
str2saddr(host, port)
char *host;
char *port;
{
struct addrinfo hints, *res;
struct sockaddr *saddr;
int error;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_NUMERICHOST;
error = getaddrinfo(host, port, &hints, &res);
if (error != 0) {
plog(LLV_ERROR, LOCATION, NULL,
"getaddrinfo(%s%s%s): %s",
host, port ? "," : "", port ? port : "",
gai_strerror(error));
return NULL;
}
if (res->ai_next != NULL) {
plog(LLV_ERROR, LOCATION, NULL,
"getaddrinfo(%s%s%s): "
"resolved to multiple address, "
"taking the first one",
host, port ? "," : "", port ? port : "");
}
saddr = racoon_malloc(res->ai_addrlen);
if (saddr == NULL) {
plog(LLV_ERROR, LOCATION, NULL,
"failed to allocate buffer.\n");
freeaddrinfo(res);
return NULL;
}
memcpy(saddr, res->ai_addr, res->ai_addrlen);
return saddr;
}
void
mask_sockaddr(a, b, l)
struct sockaddr *a;
const struct sockaddr *b;
size_t l;
{
size_t i;
u_int8_t *p, alen;
switch (b->sa_family) {
case AF_INET:
alen = sizeof(struct in_addr);
p = (u_int8_t *)&((struct sockaddr_in *)a)->sin_addr;
break;
#ifdef INET6
case AF_INET6:
alen = sizeof(struct in6_addr);
p = (u_int8_t *)&((struct sockaddr_in6 *)a)->sin6_addr;
break;
#endif
default:
plog(LLV_ERROR, LOCATION, NULL,
"invalid family: %d\n", b->sa_family);
exit(1);
}
if ((alen << 3) < l) {
plog(LLV_ERROR, LOCATION, NULL,
"unexpected inconsistency: %d %d\n", b->sa_family, l);
exit(1);
}
memcpy(a, b, b->sa_len);
p[l / 8] &= (0xff00 >> (l % 8)) & 0xff;
for (i = l / 8 + 1; i < alen; i++)
p[i] = 0x00;
}
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