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/* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr_arch_networkio.h"
#include "apr_network_io.h"
#include "apr_support.h"
#include "apr_portable.h"
#include "apr_arch_inherit.h"
#ifdef HAVE_GETIFADDRS
#include <net/if.h>
#include <ifaddrs.h>
#endif
#ifdef HAVE_STRUCT_IPMREQ
/* Only UDP and Raw Sockets can be used for Multicast */
static apr_status_t mcast_check_type(apr_socket_t *sock)
{
int type;
apr_status_t rv;
rv = apr_socket_type_get(sock, &type);
if (rv != APR_SUCCESS) {
return rv;
}
else if (type == SOCK_DGRAM || type == SOCK_RAW) {
return APR_SUCCESS;
}
else {
return APR_ENOTIMPL;
}
}
static void fill_mip_v4(struct ip_mreq *mip, apr_sockaddr_t *mcast,
apr_sockaddr_t *iface)
{
mip->imr_multiaddr = mcast->sa.sin.sin_addr;
if (iface == NULL) {
mip->imr_interface.s_addr = INADDR_ANY;
}
else {
mip->imr_interface = iface->sa.sin.sin_addr;
}
}
#if APR_HAVE_IPV6
static unsigned int find_if_index(const apr_sockaddr_t *iface)
{
unsigned int index = 0;
#ifdef HAVE_GETIFADDRS
struct ifaddrs *ifp, *ifs;
/**
* TODO: getifaddrs is only portable to *BSD and OS X. Using ioctl
* and SIOCGIFCONF is needed for Linux/Solaris support.
*
* There is a wrapper that takes the messy ioctl interface into
* getifaddrs. The license is acceptable, but, It is a fairly large
* chunk of code.
*/
if (getifaddrs(&ifs) != 0) {
return 0;
}
for (ifp = ifs; ifp; ifp = ifp->ifa_next) {
if (ifp->ifa_addr != NULL && ifp->ifa_addr->sa_family == AF_INET6) {
if (memcmp(&iface->sa.sin6.sin6_addr,
&ifp->ifa_addr->sa_data[0],
sizeof(iface->sa.sin6.sin6_addr)) == 0) {
index = if_nametoindex(ifp->ifa_name);
break;
}
}
}
freeifaddrs(ifs);
#endif
return index;
}
static void fill_mip_v6(struct ipv6_mreq *mip, const apr_sockaddr_t *mcast,
const apr_sockaddr_t *iface)
{
memcpy(&mip->ipv6mr_multiaddr, mcast->ipaddr_ptr,
sizeof(mip->ipv6mr_multiaddr));
if (iface == NULL) {
mip->ipv6mr_interface = 0;
}
else {
mip->ipv6mr_interface = find_if_index(iface);
}
}
#endif
static int sock_is_ipv4(apr_socket_t *sock)
{
if (sock->local_addr->family == APR_INET)
return 1;
return 0;
}
#if APR_HAVE_IPV6
static int sock_is_ipv6(apr_socket_t *sock)
{
if (sock->local_addr->family == APR_INET6)
return 1;
return 0;
}
#endif
static apr_status_t do_mcast(int type, apr_socket_t *sock,
apr_sockaddr_t *mcast, apr_sockaddr_t *iface,
apr_sockaddr_t *source)
{
struct ip_mreq mip4;
apr_status_t rv = APR_SUCCESS;
#if APR_HAVE_IPV6
struct ipv6_mreq mip6;
#endif
#if MCAST_JOIN_SOURCE_GROUP
struct group_source_req mip;
int ip_proto;
#endif
rv = mcast_check_type(sock);
if (rv != APR_SUCCESS) {
return rv;
}
if (source != NULL) {
#if MCAST_JOIN_SOURCE_GROUP
if (sock_is_ipv6(sock))
ip_proto = IPPROTO_IP;
else if (sock_is_ipv6(sock))
ip_proto = IPPROTO_IPV6;
else
return APR_ENOTIMPL;
if (type == IP_ADD_MEMBERSHIP)
type = MCAST_JOIN_SOURCE_GROUP;
else if (type == IP_DROP_MEMBERSHIP)
type = MCAST_LEAVE_SOURCE_GROUP;
else
return APR_ENOTIMPL;
mip.gsr_interface = find_if_index(iface);
memcpy(&mip.gsr_group, mcast->ipaddr_ptr, sizeof(mip.gsr_group));
memcpy(&mip.gsr_source, source->ipaddr_ptr, sizeof(mip.gsr_source));
if (setsockopt(sock->socketdes, ip_proto, type, (const void *) &mip,
sizeof(mip)) == -1) {
rv = errno;
}
#else
/* We do not support Source-Specific Multicast. */
return APR_ENOTIMPL;
#endif
}
else {
if (sock_is_ipv4(sock)) {
fill_mip_v4(&mip4, mcast, iface);
if (setsockopt(sock->socketdes, IPPROTO_IP, type,
(const void *) &mip4, sizeof(mip4)) == -1) {
rv = errno;
}
}
#if APR_HAVE_IPV6
else if (sock_is_ipv6(sock)) {
if (type == IP_ADD_MEMBERSHIP) {
type = IPV6_JOIN_GROUP;
}
else if (type == IP_DROP_MEMBERSHIP) {
type = IPV6_LEAVE_GROUP;
}
else {
return APR_ENOTIMPL;
}
fill_mip_v6(&mip6, mcast, iface);
if (setsockopt(sock->socketdes, IPPROTO_IPV6, type,
&mip6, sizeof(mip6)) == -1) {
rv = errno;
}
}
#endif
else {
rv = APR_ENOTIMPL;
}
}
return rv;
}
static apr_status_t do_mcast_opt(int type, apr_socket_t *sock,
apr_byte_t value)
{
apr_status_t rv = APR_SUCCESS;
rv = mcast_check_type(sock);
if (rv != APR_SUCCESS) {
return rv;
}
if (sock_is_ipv4(sock)) {
if (setsockopt(sock->socketdes, IPPROTO_IP, type,
(const void *) &value, sizeof(value)) == -1) {
rv = errno;
}
}
#if APR_HAVE_IPV6
else if (sock_is_ipv6(sock) && type == IP_MULTICAST_LOOP) {
unsigned int loopopt = value;
type = IPV6_MULTICAST_LOOP;
if (setsockopt(sock->socketdes, IPPROTO_IPV6, type,
&loopopt, sizeof(loopopt)) == -1) {
rv = errno;
}
}
else if (sock_is_ipv6(sock)) {
if (type == IP_MULTICAST_TTL) {
type = IPV6_MULTICAST_HOPS;
}
else {
return APR_ENOTIMPL;
}
if (setsockopt(sock->socketdes, IPPROTO_IPV6, type,
&value, sizeof(value)) == -1) {
rv = errno;
}
}
#endif
else {
rv = APR_ENOTIMPL;
}
return rv;
}
#endif
APR_DECLARE(apr_status_t) apr_mcast_join(apr_socket_t *sock,
apr_sockaddr_t *join,
apr_sockaddr_t *iface,
apr_sockaddr_t *source)
{
#if defined(IP_ADD_MEMBERSHIP) && defined(HAVE_STRUCT_IPMREQ)
return do_mcast(IP_ADD_MEMBERSHIP, sock, join, iface, source);
#else
return APR_ENOTIMPL;
#endif
}
APR_DECLARE(apr_status_t) apr_mcast_leave(apr_socket_t *sock,
apr_sockaddr_t *addr,
apr_sockaddr_t *iface,
apr_sockaddr_t *source)
{
#if defined(IP_DROP_MEMBERSHIP) && defined(HAVE_STRUCT_IPMREQ)
return do_mcast(IP_DROP_MEMBERSHIP, sock, addr, iface, source);
#else
return APR_ENOTIMPL;
#endif
}
APR_DECLARE(apr_status_t) apr_mcast_hops(apr_socket_t *sock, apr_byte_t ttl)
{
#if defined(IP_MULTICAST_TTL) && defined(HAVE_STRUCT_IPMREQ)
return do_mcast_opt(IP_MULTICAST_TTL, sock, ttl);
#else
return APR_ENOTIMPL;
#endif
}
APR_DECLARE(apr_status_t) apr_mcast_loopback(apr_socket_t *sock,
apr_byte_t opt)
{
#if defined(IP_MULTICAST_LOOP) && defined(HAVE_STRUCT_IPMREQ)
return do_mcast_opt(IP_MULTICAST_LOOP, sock, opt);
#else
return APR_ENOTIMPL;
#endif
}
APR_DECLARE(apr_status_t) apr_mcast_interface(apr_socket_t *sock,
apr_sockaddr_t *iface)
{
#if defined(IP_MULTICAST_IF) && defined(HAVE_STRUCT_IPMREQ)
apr_status_t rv = APR_SUCCESS;
if (sock_is_ipv4(sock)) {
if (setsockopt(sock->socketdes, IPPROTO_IP, IP_MULTICAST_IF,
(const void *) &iface->sa.sin.sin_addr,
sizeof(iface->sa.sin.sin_addr)) == -1) {
rv = errno;
}
}
#if APR_HAVE_IPV6
else if (sock_is_ipv6(sock)) {
unsigned int idx = find_if_index(iface);
if (setsockopt(sock->socketdes, IPPROTO_IPV6, IPV6_MULTICAST_IF,
&idx, sizeof(idx)) == -1) {
rv = errno;
}
}
#endif
else {
rv = APR_ENOTIMPL;
}
return rv;
#else
return APR_ENOTIMPL;
#endif
}
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