C/C++ 利用IP地址得到物理位置

利用IP地址得到物理位置：

原理：這裏要講的就是通過socket去發送GET請求，發送至轉換的網站，然後解析其中的內容，這裏GET的是http://ip.chinaz.com/網站。

步驟：

1. 先使用Wireshark抓包工具，抓取查詢http://ip.chinaz.com/的封包，然後就可以模仿這個封包，利用socket發送GET請求，獲取IP地址的物理地址信息了。
   
   從上面可以得到要發送的封包的具體格式：

GET /?IP=223.124.1.232 HTTP/1.1\r\n
Host: ip.chinaz.com\r\n
Connection: keep-alive\r\n
Upgrade-Insecure-Requests: 1\r\n
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36\r\n
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8\r\n
Accept-Language: zh-CN,zh;q=0.8\r\n\r\n

使用socket進行send發送時,緩衝區填入上面的固定格式即可，這裏要改的只有?IP=你要查詢的IP地址
這裏還要強調一點，在上面的封包中最好不要加上Accept-Encoding: gzip, deflate, sdch\r\n，除非你會使用代碼解壓gzip壓縮包，否則recv接收服務器響應回來的文檔的時候，發送的是gzip壓縮過的數據。由於我們只是查詢而已，所以去掉這個字段，讓服務器直接發回來html文檔，然後我們解析就可以了。

下面是一個解析http://ip.chinaz.com/獲取物理地址的例子：

//名字轉IP(OK,New)
char* NET::GetIp(char* szhostname)
{
    char* szip = NULL;
    char* ipbit = NULL;
    hostent* ipstr = NULL;

    szip = new char[30];
    if (!szip)
        goto Err;
    ZeroMemory(szip, 30);
    ipstr = gethostbyname(szhostname);
    if (ipstr == NULL)
        goto Err;
    ipbit = inet_ntoa(*(in_addr*)ipstr->h_addr);
    if (ipbit == NULL)
        goto Err;
    memcpy(szip, ipbit, strlen(ipbit));


    return szip;
Err:
    return NULL;
}

//連接HTTP服務器（OK,Connected）
SOCKET NET::ConnectHttpServer(char* szip)
{
    SOCKET szclient_socket = 0;

    szclient_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (INVALID_SOCKET == szclient_socket)
        goto Err;
    //連接服務器
    SOCKADDR_IN info;
    info.sin_port = htons(80);
    info.sin_family = AF_INET;
    info.sin_addr.S_un.S_addr = inet_addr(szip);
    if (0 != connect(szclient_socket, (SOCKADDR*)&info, sizeof(SOCKADDR)))
        goto Err;

    //返回
    return szclient_socket;
Err:
    if (szclient_socket != NULL && szclient_socket != INVALID_SOCKET)
    {
        closesocket(szclient_socket);
        szclient_socket = 0;
    }
    return 0;
}

//設置套接字緩衝區大小（OK）
BOOL NET::SetSocketInfo(SOCKET szsocket,int uBufferSize)
{
    if (SOCKET_ERROR == setsockopt(szsocket, SOL_SOCKET, SO_RCVBUF, (char*)&uBufferSize, sizeof(int)))
        goto Err;
    if (SOCKET_ERROR == setsockopt(szsocket, SOL_SOCKET, SO_SNDBUF, (char*)&uBufferSize, sizeof(int)))
        goto Err;
    return TRUE;
Err:
    return FALSE;
}


//UTF8轉ANSI字符串(OK,New)
char* STR::Utf8ToAnsi(char* utf8,int len,char szcc)
{
    BOOL szok = FALSE;
    int szlen = 0;
    char* szretstr = NULL;
    wchar_t* whar_str = NULL;
    //UTF8轉UNICODE
    szlen = MultiByteToWideChar(CP_UTF8, 0, utf8, len, NULL, 0);
    if (szlen <= 0)
        goto Err;
    szlen += 1;
    whar_str = new wchar_t[szlen];
    if (!whar_str)
        goto Err;
    ZeroMemory(whar_str, szlen * sizeof(wchar_t));
    MultiByteToWideChar(CP_UTF8, 0, utf8, len, whar_str, szlen);
    if (GetLastError() != 0)
        goto Err;
    //UNICODE轉ANSI
    szlen = WideCharToMultiByte(CP_ACP, 0, whar_str, len, NULL, 0,&szcc,&szok);
    if (szlen <= 0)
        goto Err;
    szlen += 1;
    szretstr = new char[szlen];
    if (!szretstr)
        goto Err;
    ZeroMemory(szretstr, szlen * sizeof(char));
    WideCharToMultiByte(CP_ACP, 0, whar_str, len, szretstr, szlen, &szcc, &szok);
    if (GetLastError() != 0)
        goto Err;
    if (whar_str)
    {
        delete[] whar_str;
        whar_str = NULL;
    }
    return szretstr;
Err:
    if (whar_str)
    {
        delete[]whar_str;
        whar_str = NULL;
    }
    return NULL;
}


//獲取物理地址(OK,ip.chinaz.com,New)
char* GET_POINT::GetPoint(char* ip_address,char* get_ip_de_host_name)
{
    int szlen = 0;
    char* szPoint = NULL;
    char* szTemp = NULL;
    char* szTemp2 = NULL;
    char* szTemp3 = NULL;
    char* get_host_name_ip = NULL;
    SOCKET http_client_socket = NULL;
    char packet[400] ="GET /";
    strcat(packet, "?IP=");
    strcat(packet, ip_address);
    strcat(packet, " HTTP/1.1\r\n" \
    "Host: "
    );
    strcat(packet, get_ip_de_host_name);
    strcat(packet, "\r\n" 
        "Connection: keep-alive\r\n" 
        "Cache-Control: max-age=0\r\n" 
        "Upgrade-Insecure-Requests: 1\r\n" 
        "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8\r\n" 
        "Accept-Language: zh-CN,zh;q=0.8\r\n\r\n"
    );


    char* recv_buffer = NULL;
    //代碼開始
    recv_buffer = new char[50000];
    if (!recv_buffer)
        goto Err;
    ZeroMemory(recv_buffer, 50000);
    //返回解析物理地址的主機的IP地址
    get_host_name_ip = NET::GetIp(get_ip_de_host_name);
    if (get_host_name_ip == NULL)
        goto Err;

    //連接服務器
    http_client_socket = NET::ConnectHttpServer(get_host_name_ip);
    if (http_client_socket == 0)
        goto Err;

    //設置緩衝區大小
    if (!NET::SetSocketInfo(http_client_socket, 30000))
        goto Err;
    if (send(http_client_socket, packet, strlen(packet), 0) <= 0)
        goto Err;
    if (recv(http_client_socket, recv_buffer, 50000, 0) <= 0)
        goto Err;
    szTemp3 = STR::Utf8ToAnsi(recv_buffer, -1,'.');
    if (szTemp3 == NULL)
        goto Err;
    szTemp = StrStrA(szTemp3, "IP的物理位置");
    if (szTemp == NULL)
        goto Err;
    szTemp = StrStrA(szTemp, "w50");
    if (szTemp == NULL)
        goto Err;
    szTemp += strlen("w50-0\">"); //???
    if (szTemp == NULL)
        goto Err;
    szTemp2 = strchr(szTemp, '<');
    if (szTemp2 == NULL)
        goto Err; 
    szlen = szTemp2 - szTemp;
    if (szlen <= 0)
        goto Err;
    szlen += 1;
    szPoint = new char[szlen];
    if (!szPoint)
        goto Err;
    ZeroMemory(szPoint, szlen);
    memcpy(szPoint, szTemp, szlen - 1);

    if (get_host_name_ip)
    {
        delete[]get_host_name_ip;
        get_host_name_ip = NULL;
    }
    if (http_client_socket)
    {
        closesocket(http_client_socket);
        http_client_socket = 0;
    }
    if (recv_buffer)
    {
        delete[]recv_buffer;
        recv_buffer = NULL;
    }
    if (szTemp3)
    {
        delete[]szTemp3;
        szTemp3 = NULL;
    }
    return szPoint;
Err:
    if (get_host_name_ip)
    {
        delete[]get_host_name_ip;
        get_host_name_ip = NULL;
    }
    if (http_client_socket)
    {
        closesocket(http_client_socket);
        http_client_socket = 0;
    }
    if (recv_buffer)
    {
        delete[]recv_buffer;
        recv_buffer = NULL;
    }
    if (szTemp3)
    {
        delete[]szTemp3;
        szTemp3 = NULL;
    }
    return NULL;
}

實現：