View Antoni Milton's profile on LinkedIn

Tuesday, August 9, 2011

How to resolve the IPv6 Address from domain name in C++ ?

In general, we are using gethostbyname or gethostbyname_r for resolving IPAddress from domain name. These system calls are not supporting IPv6 format.

For resolve IPv6Address from domain name, we need to use gethostbyname2_r function.

struct in6_addr aadrv6;
struct hostent *host;
char* pszHostName = “localhost6.localdomain6”;
char strIPAddr[50];
char buffer[2048];
int iError = 0,hrr;

iError = gethostbyname2_r( pszHostName, AF_INET6, &hostbuf,buffer, 2048,&host,&hrr );

if( iError == 0 && host != NULL )
    memcpy( &aadrv6 , host->h_addr_list[0], sizeof( in6_addr ) );
   if( inet_ntop ( AF_INET6, &aadrv6, strIPAddr, INET6_ADDRSTRLEN ) != NULL )
        printf("IPv6Address: %s\n", strIPAddr);

IPv6Address: ::1

No comments: