袜子在C代理认证

Question

I have a function designed to make a socks handshake packet; but I can't find any information regarding how the authorization fields are filled. How is the authentication packet formatted?

void socks_auth(int sd, char *buffer) {
    char *ptrBuff;
    ptrBuff = buffer;
    *(ptrBuff++) = SOCKS_V;
    *(ptrBuff++) = 2;
    *(ptrBuff++) = 0x00;
    *(ptrBuff++) = 0x02;
    send(sd, ptrBuff, ptrBuff - buffer, 0);
    recv(sd, buffer, 2, 0);
    if (buffer[1] == 0xFF) write(STDOUT_FILENO, "not supported\n", 14);
    if (buffer[1] == 0x02) {

    };
}

Answer 1

I'd suggest you start with RFC1928 , SOCKS Protocol Version 5 and possibly RFC1961 GSS-API Authentication Method for SOCKS Version 5 .

If neither of those help, perhaps looking at the source of socat , which can act as a SOCKS5 proxy, will help.