使用的是raknet中獲取網卡的方式，支持linux，ios，安卓系統。未支持win。
#if defined(ANDROID)
void UdpSocket::getHostIpByString( char ipList[ MAXIMUM_NUMBER_OF_INTERNAL_IDS ][ 16 ], unsigned int binaryAddresses[MAXIMUM_NUMBER_OF_INTERNAL_IDS] )
{
struct ifreq ifreqs[MAXIMUM_NUMBER_OF_INTERNAL_IDS];
struct ifconf ifconf;
struct in_addr bin_addr;
memset(&ifconf,0,sizeof(ifconf));
ifconf.ifc_buf = (char*) (ifreqs);
ifconf.ifc_len = sizeof(ifreqs);
{ // get list of interfaces
int sock = socket(AF_INET,SOCK_STREAM,0);
if (sock < 0)
{
perror("Error creating socket");
return;
}
if ((ioctl(sock, SIOCGIFCONF, (char*) &ifconf )) < 0 )
{
perror("Error returned from ioctl(SIOGIFCONF)");
ifconf.ifc_len = 0;
}
close(sock);
}
int idx = 0;
int iface_count = ifconf.ifc_len/sizeof(struct ifreq);
printf("Interfaces (%d):\n", iface_count);
for( ; idx < iface_count; idx++)
{
char ip_addr[ 16/*INET_ADDRSTRLEN */];
struct sockaddr_in *b = (struct sockaddr_in *) &(ifreqs[idx].ifr_addr);
const char* host = inet_ntop(AF_INET, & b->sin_addr, ip_addr, sizeof ip_addr);
strcpy( ipList[idx], host );
if (inet_aton(host, &bin_addr) == 0)
{
perror("inet_aton error");
continue;
}
else
{
binaryAddresses[idx] = bin_addr.s_addr;
}
printf("\t%-10s\t%s (%08x)\n", ifreqs[idx].ifr_name, ipList[idx], binaryAddresses[idx]);
}
for ( ; idx < MAXIMUM_NUMBER_OF_INTERNAL_IDS; ++idx )
{
ipList[idx][0]=0;
}
}
#else
void UdpSocket::getHostIpByString(char ipList[ MAXIMUM_NUMBER_OF_INTERNAL_IDS ][ 16 ], unsigned int binaryAddresses[MAXIMUM_NUMBER_OF_INTERNAL_IDS])
{
struct ifaddrs *ifaddr, *ifa;
int family, s;
char host[NI_MAXHOST];
struct in_addr linux_in_addr;
if (getifaddrs(&ifaddr) == -1) {
printf( "Error getting interface list\n");
}
int idx = 0;
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
if (!ifa->ifa_addr) continue;
family = ifa->ifa_addr->sa_family;
if (family == AF_INET) {
s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if (s != 0) {
printf ("getnameinfo() failed: %s\n", gai_strerror(s));
}
printf ("IP address: %s\n", host);
if (strcmp(host,"127.0.0.1")!=0)
{
strcpy( ipList[ idx ], host );
if (inet_aton(host, &linux_in_addr) == 0) {
perror("inet_aton");
}
else {
binaryAddresses[idx]=linux_in_addr.s_addr;
}
idx++;
}
}
}
for ( ; idx < MAXIMUM_NUMBER_OF_INTERNAL_IDS; ++idx )
{
ipList[idx][0]=0;
}
freeifaddrs(ifaddr);
}
#endif