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/* $Id: openssdpsocket.c,v 1.12 2012/05/21 17:13:11 nanard Exp $ */
/* MiniUPnP project
* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
* (c) 2006-2012 Thomas Bernard
* This software is subject to the conditions detailed
* in the LICENCE file provided within the distribution */
#include "config.h"
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <syslog.h>
#include "openssdpsocket.h"
#include "upnputils.h"
/* SSDP ip/port */
#define SSDP_PORT (1900)
#define SSDP_MCAST_ADDR ("239.255.255.250")
/* Link Local and Site Local SSDP IPv6 multicast addresses */
#define LL_SSDP_MCAST_ADDR ("FF02::C")
#define SL_SSDP_MCAST_ADDR ("FF05::C")
/**
* Get the IPv4 address from a string
* representing the address or the interface name
*/
static in_addr_t
GetIfAddrIPv4(const char * ifaddr)
{
in_addr_t addr;
int s;
struct ifreq ifr;
int ifrlen;
/* let's suppose ifaddr is a IPv4 address
* such as 192.168.1.1 */
addr = inet_addr(ifaddr);
if(addr != INADDR_NONE)
{
return addr;
}
/* let's suppose the ifaddr was in fact an interface name
* such as eth0 */
s = socket(PF_INET, SOCK_DGRAM, 0);
if(s < 0)
{
syslog(LOG_ERR, "socket(PF_INET, SOCK_DGRAM): %m");
return INADDR_NONE;
}
memset(&ifr, 0, sizeof(struct ifreq));
strncpy(ifr.ifr_name, ifaddr, IFNAMSIZ);
if(ioctl(s, SIOCGIFADDR, &ifr, &ifrlen) < 0)
{
syslog(LOG_ERR, "ioctl(s, SIOCGIFADDR, ...): %m");
close(s);
return INADDR_NONE;
}
syslog(LOG_DEBUG, "GetIfAddrIPv4(%s) = %s", ifaddr,
inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr));
addr = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr;
close(s);
return addr;
}
/**
* Add the multicast membership for SSDP on the interface
* @param s the socket
* @param ifaddr the IPv4 address or interface name
* @param ipv6 IPv6 or IPv4
* return -1 on error, 0 on success */
int
AddDropMulticastMembership(int s, const char * ifaddr, int ipv6, int drop)
{
struct ip_mreq imr; /* Ip multicast membership */
#ifdef ENABLE_IPV6
struct ipv6_mreq mr;
unsigned int ifindex;
#endif
if(s <= 0)
return -1; /* nothing to do */
#ifdef ENABLE_IPV6
if(ipv6)
{
ifindex = if_nametoindex(ifaddr);
memset(&mr, 0, sizeof(mr));
inet_pton(AF_INET6, LL_SSDP_MCAST_ADDR, &mr.ipv6mr_multiaddr);
mr.ipv6mr_interface = ifindex;
if(setsockopt(s, IPPROTO_IPV6, drop ? IPV6_LEAVE_GROUP : IPV6_JOIN_GROUP,
&mr, sizeof(struct ipv6_mreq)) < 0)
{
syslog(LOG_ERR, "setsockopt(udp, %s)(%s, %s): %m",
drop ? "IPV6_LEAVE_GROUP" : "IPV6_JOIN_GROUP",
LL_SSDP_MCAST_ADDR,
ifaddr);
return -1;
}
inet_pton(AF_INET6, SL_SSDP_MCAST_ADDR, &mr.ipv6mr_multiaddr);
if(setsockopt(s, IPPROTO_IPV6, drop ? IPV6_LEAVE_GROUP : IPV6_JOIN_GROUP,
&mr, sizeof(struct ipv6_mreq)) < 0)
{
syslog(LOG_ERR, "setsockopt(udp, %s)(%s, %s): %m",
drop ? "IPV6_LEAVE_GROUP" : "IPV6_JOIN_GROUP",
SL_SSDP_MCAST_ADDR,
ifaddr);
return -1;
}
}
else
{
#endif
/* setting up imr structure */
imr.imr_multiaddr.s_addr = inet_addr(SSDP_MCAST_ADDR);
/*imr.imr_interface.s_addr = htonl(INADDR_ANY);*/
/*imr.imr_interface.s_addr = inet_addr(ifaddr);*/
imr.imr_interface.s_addr = GetIfAddrIPv4(ifaddr);
if(imr.imr_interface.s_addr == INADDR_NONE)
{
syslog(LOG_ERR, "no IPv4 address for interface %s",
ifaddr);
return -1;
}
if (setsockopt(s, IPPROTO_IP, drop ? IP_DROP_MEMBERSHIP : IP_ADD_MEMBERSHIP,
(void *)&imr, sizeof(struct ip_mreq)) < 0)
{
syslog(LOG_ERR, "setsockopt(udp, %s)(%s): %m",
drop ? "IP_DROP_MEMBERSHIP" : "IP_ADD_MEMBERSHIP",
ifaddr);
return -1;
}
#ifdef ENABLE_IPV6
}
#endif
return 0;
}
int
OpenAndConfSSDPReceiveSocket(int n_listen_addr,
const char * * listen_addr,
int ipv6)
{
int s;
int opt = 1;
#ifdef ENABLE_IPV6
struct sockaddr_storage sockname;
#else
struct sockaddr_in sockname;
#endif
socklen_t sockname_len;
#ifdef ENABLE_IPV6
if( (s = socket(ipv6 ? PF_INET6 : PF_INET, SOCK_DGRAM, 0)) < 0)
#else
if( (s = socket(PF_INET, SOCK_DGRAM, 0)) < 0)
#endif
{
syslog(LOG_ERR, "socket(udp): %m");
return -1;
}
if(!set_non_blocking(s)) {
syslog(LOG_WARNING, "Failed to set SSDP socket non blocking : %m");
}
#ifdef ENABLE_IPV6
memset(&sockname, 0, sizeof(struct sockaddr_storage));
if(ipv6)
{
#ifdef IPV6_V6ONLY
if(setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
(char *)&opt, sizeof(opt)) < 0)
{
syslog(LOG_WARNING, "setsockopt(IPV6_V6ONLY): %m");
}
#endif
struct sockaddr_in6 * sa = (struct sockaddr_in6 *)&sockname;
sa->sin6_family = AF_INET6;
sa->sin6_port = htons(SSDP_PORT);
sa->sin6_addr = in6addr_any;
sockname_len = sizeof(struct sockaddr_in6);
}
else
{
struct sockaddr_in * sa = (struct sockaddr_in *)&sockname;
sa->sin_family = AF_INET;
sa->sin_port = htons(SSDP_PORT);
sa->sin_addr.s_addr = htonl(INADDR_ANY);
sockname_len = sizeof(struct sockaddr_in);
}
#else
memset(&sockname, 0, sizeof(struct sockaddr_in));
sockname.sin_family = AF_INET;
sockname.sin_port = htons(SSDP_PORT);
/* NOTE : it seems it doesnt work when binding on the specific address */
/*sockname.sin_addr.s_addr = inet_addr(UPNP_MCAST_ADDR);*/
sockname.sin_addr.s_addr = htonl(INADDR_ANY);
/*sockname.sin_addr.s_addr = inet_addr(ifaddr);*/
sockname_len = sizeof(struct sockaddr_in);
#endif
if(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0)
{
syslog(LOG_WARNING, "setsockopt(SO_REUSEADDR): %m");
}
if(bind(s, (struct sockaddr *)&sockname, sockname_len) < 0)
{
syslog(LOG_ERR, "bind(udp%s): %m", ipv6 ? "6" : "");
close(s);
return -1;
}
while(n_listen_addr>0)
{
n_listen_addr--;
if(AddDropMulticastMembership(s, listen_addr[n_listen_addr], ipv6, 0) < 0)
{
syslog(LOG_WARNING, "Failed to add IPv%d multicast membership for interface %s.",
ipv6 ? 6 : 4,
listen_addr[n_listen_addr] );
}
}
return s;
}
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