startClient_6_to_4

#define _WS2DEF_
#include "inaddr.h"
#include "MSTcpIP.h"

void startServer();
void startClient_6_to_4(short xxport);
void startClient_4_to_4(short xxport);
void startClient_6_to_6(short xxport);

short xxport = 8112;
bool useV4 = false;

void startServer()
{
    WSADATA wsaData;
    SOCKET lsock = INVALID_SOCKET;
    SOCKET csock = INVALID_SOCKET;
    SOCKADDR_STORAGE serverAddr = { 0 };
    SOCKADDR_STORAGE clientAddr = { 0 };
    int off = 0;
    int port = xxport;
    int clientAddrLen = sizeof(clientAddr);
    WSAStartup(MAKEWORD(2, 2), &wsaData);

    serverAddr.ss_family = AF_INET6;
    INETADDR_SETANY((SOCKADDR *)&serverAddr);
    SS_PORT(&serverAddr) = htons((unsigned short)port);
    lsock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
    
    //make the socket a dual mode socket
    setsockopt(lsock, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&off, sizeof(off));
    bind(lsock, (SOCKADDR *)&serverAddr, (int)INET_SOCKADDR_LENGTH(serverAddr.ss_family));
    listen(lsock, 5);
    csock = accept(lsock, (SOCKADDR *)&clientAddr, &clientAddrLen);

    char str[128];

    if (clientAddr.ss_family = AF_INET6)
        inet_ntop(clientAddr.ss_family, &((sockaddr_in6*)&clientAddr)->sin6_addr, str, 128);
    else
        inet_ntop(clientAddr.ss_family, &((sockaddr_in*)&clientAddr)->sin_addr, str, 128);

    printf("accepted connection from \"%s\"\n", str);
    
    WSACleanup();
}

void ConvertToV4MappedAddressIfNeeded(PSOCKADDR pAddr)
{
    // if v4 address, convert to v4 mapped v6 address
    if (AF_INET == pAddr->sa_family)
    {
        IN_ADDR In4addr;
        SCOPE_ID scope = INETADDR_SCOPE_ID(pAddr);
        USHORT port = INETADDR_PORT(pAddr);
        In4addr = *(IN_ADDR*)INETADDR_ADDRESS(pAddr);
        ZeroMemory(pAddr, sizeof(SOCKADDR_STORAGE));
        IN6ADDR_SETV4MAPPED(
            (PSOCKADDR_IN6)pAddr,
            &In4addr,
            scope,
            port
        );
    }
}

void startClient_6_to_4(short xxport)
{
    WSADATA wsaData;
    SOCKET csock = INVALID_SOCKET;
    SOCKADDR_STORAGE addrLoopback4 = { 0 };

    int port = xxport;
    int off = 0;

    addrLoopback4.ss_family = AF_INET;
    INETADDR_SETLOOPBACK((SOCKADDR*)&addrLoopback4);
    SS_PORT(&addrLoopback4) = htons((short)port);

    WSAStartup(MAKEWORD(2, 2), &wsaData);
    if ((csock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET)
    {
        //error creating the listening socket
        WSACleanup();
        return;
    }

    //make the socket a dual mode socket
    setsockopt(csock, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&off, sizeof(off));

    // format the address as a v4 mapped address if needed
    ConvertToV4MappedAddressIfNeeded((SOCKADDR *)&addrLoopback4);
    // connect
    if (0 == connect(csock, (SOCKADDR *)&addrLoopback4, sizeof(addrLoopback4)))
    {
        printf("Connect complete from v6\n");
    }
    else
    {
        printf("Connect from v6 failed err:%d\n", WSAGetLastError());
    }
    
    closesocket(csock);
    WSACleanup();
}

void startClient_4_to_4(short xxport)
{
    WSADATA wsaData;
    SOCKET csock = INVALID_SOCKET;
    SOCKADDR_STORAGE addrLoopback4 = { 0 };

    int port = xxport;
    int off = 0;

    addrLoopback4.ss_family = AF_INET;
    INETADDR_SETLOOPBACK((SOCKADDR*)&addrLoopback4);
    SS_PORT(&addrLoopback4) = htons((short)port);

    WSAStartup(MAKEWORD(2, 2), &wsaData);
    if ((csock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET)
    {
        //error creating the listening socket
        WSACleanup();
        return;
    }

    //make the socket a dual mode socket
    //setsockopt(csock, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&off, sizeof(off));

    // format the address as a v4 mapped address if needed
    //ConvertToV4MappedAddressIfNeeded((SOCKADDR *)&addrLoopback4);
    // connect
    if (0 == connect(csock, (SOCKADDR *)&addrLoopback4, sizeof(addrLoopback4)))
    {
        printf("Connect complete from v4\n");
    }
    else
    {
        printf("Connect from v4 failed err:%d\n", WSAGetLastError());
    }

    closesocket(csock);
    WSACleanup();
}

void startClient_6_to_6(short xxport)
{
    WSADATA wsaData;
    SOCKET csock = INVALID_SOCKET;
    SOCKADDR_STORAGE addrLoopback4 = { 0 };

    int port = xxport;
    int off = 0;

    addrLoopback4.ss_family = AF_INET6;
    INETADDR_SETLOOPBACK((SOCKADDR*)&addrLoopback4);
    SS_PORT(&addrLoopback4) = htons((short)port);

    WSAStartup(MAKEWORD(2, 2), &wsaData);
    if ((csock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET)
    {
        //error creating the listening socket
        WSACleanup();
        return;
    }

    //make the socket a dual mode socket
    //setsockopt(csock, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&off, sizeof(off));

    // format the address as a v4 mapped address if needed
    //ConvertToV4MappedAddressIfNeeded((SOCKADDR *)&addrLoopback4);
    // connect
    if (0 == connect(csock, (SOCKADDR *)&addrLoopback4, sizeof(addrLoopback4)))
    {
        printf("Connect complete from v6 to v6\n");
    }
    else
    {
        printf("Connect from v6 to v6 failed err:%d\n", WSAGetLastError());
    }

    closesocket(csock);
    WSACleanup();
}