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getif_workaround_android.h 1.09 KiB
//Code from getifaddrs.3 man
#include <arpa/inet.h>
#include <sys/socket.h>
#include <ifaddrs.h>
#include <stdlib.h>
#include <unistd.h>
#include <net/if.h>
#include <asio.hpp>
#include <stdexcept>
namespace dht{
namespace workaround{
asio::ip::address_v4
get_interface(){
struct ifaddrs *ifaddr;
if(getifaddrs(&ifaddr) == -1){
throw std::runtime_error("Can't getifaddrs");
}
for (struct ifaddrs *if1 = ifaddr; if1 != NULL; if1 = if1->ifa_next){
if (if1->ifa_addr == NULL)
continue;
if (if1->ifa_addr->sa_family != AF_INET)
continue;
if((if1->ifa_flags & IFF_MULTICAST) == IFF_MULTICAST){
char* sa_data = if1->ifa_addr->sa_data;
uint32_t value = sa_data[2] << 24
| sa_data[3] << 16
| sa_data[4] << 8
| sa_data[5];
freeifaddrs(ifaddr);
return asio::ip::address_v4(value);
}
}
freeifaddrs(ifaddr);
throw std::runtime_error("Can't find a interface which supports multicast");
}
} /* namespace workaround */
} /* namespace dht */