IPv6 Link-local address binding problem:bind()

[mohans_idea]

Hi,

I have installed IPv6 Preview patch on my Windows2000 machine to enable IPv6 on it. I had setup the two IPv6 enabled hosts in a private LAN(connected via cross cables).
Then ping6.exe is working fine between these two IPv6 hosts. But If u try to bind with IPv6 Linklocal address using Win32 socket programming then its throwing error like:
Error : WSAEADDRNOTAVAIL (10049) Cannot assign requested address.

The same bind() is allowing for IPv6 loopback address "::1". But we can't use loopback address for IPv6 socket communication between two hosts.

Please help me out from this Issue.

So please find the following IPv6 Win32 Server.c program here:
------------------------------------------------------------
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <stdio.h>

// Need to link with Ws2_32.lib, Mswsock.lib, and Advapi32.lib

#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"
#define IPV6_ADDR_STR "fe80::211:43ff:fe13:d18b"
#define IPV6_LOOPBACKADDR_STR "::1"


int __cdecl main(void)
{
WSADATA wsaData;
SOCKET ListenSocket = INVALID_SOCKET,
ClientSocket = INVALID_SOCKET;
struct addrinfo *result = NULL,
hints;
char recvbuf[DEFAULT_BUFLEN];
int iResult, iSendResult;
int recvbuflen = DEFAULT_BUFLEN;


// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed: %d\n", iResult);
return 1;
}

ZeroMemory(&hints, sizeof(hints));
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
hints.ai_flags = AI_NUMERICHOST | AI_PASSIVE;

// Resolve the server address and port
iResult = getaddrinfo(IPV6_ADDR_STR, DEFAULT_PORT, &hints, &result);
if ( iResult != 0 ) {
printf("getaddrinfo failed: %d\n", iResult);
WSACleanup();
return 1;
}

// Create a SOCKET for connecting to server
ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
if (ListenSocket == INVALID_SOCKET) {
printf("socket failed: %ld\n", WSAGetLastError());
freeaddrinfo(result);
WSACleanup();
return 1;
}

// Setup the TCP listening socket
iResult = bind( ListenSocket, result->ai_addr, (int)result->ai_addrlen);
printf ("\n\nWSAGetLastError(): [%d]\n\n", WSAGetLastError());
if (iResult == SOCKET_ERROR) {
printf("bind failed: %d\n", WSAGetLastError());
freeaddrinfo(result);
closesocket(ListenSocket);
WSACleanup();
return 1;
}

freeaddrinfo(result);

iResult = listen(ListenSocket, SOMAXCONN);
if (iResult == SOCKET_ERROR) {
printf("listen failed: %d\n", WSAGetLastError());
closesocket(ListenSocket);
WSACleanup();
return 1;
}
printf ("Listening to IPv6 client connection\n");
// Accept a client socket
ClientSocket = accept(ListenSocket, NULL, NULL);
if (ClientSocket == INVALID_SOCKET) {
printf("accept failed: %d\n", WSAGetLastError());
closesocket(ListenSocket);
WSACleanup();
return 1;
}
//IN6ADDR_ANY_INIT
//INADDR_ANY
// No longer need server socket
closesocket(ListenSocket);

// Receive until the peer shuts down the connection
do {

iResult = recv(ClientSocket, recvbuf, recvbuflen, 0);
printf ("IPv6-Server-Received: %s\n", recvbuf);
if (iResult > 0) {
printf("Bytes received: %d\n", iResult);

// Echo the buffer back to the sender
iSendResult = send( ClientSocket, recvbuf, iResult, 0 );
if (iSendResult == SOCKET_ERROR) {
printf("send failed: %d\n", WSAGetLastError());
closesocket(ClientSocket);
WSACleanup();
return 1;
}
printf ("IPv6-Server-Sent: %s\n", recvbuf);
printf("Bytes sent: %d\n", iSendResult);
}
else if (iResult == 0)
printf("Connection closing...\n");
else {
printf("recv failed: %d\n", WSAGetLastError());
closesocket(ClientSocket);
WSACleanup();
return 1;
}

} while (iResult > 0);

// shutdown the connection since we're done
iResult = shutdown(ClientSocket, SD_SEND);
if (iResult == SOCKET_ERROR) {
printf("shutdown failed: %d\n", WSAGetLastError());
closesocket(ClientSocket);
WSACleanup();
return 1;
}

// cleanup
closesocket(ClientSocket);
WSACleanup();

return 0;
}
-------------------------------------------------------------


Thanks & Regards,
Mohan
Reply @ mohans_idea@yahoo.co.in