Доработать сокет клиента и сокет сервера

#include <cstdlib>
#include <iostream>
#include <string>
#include <sstream>
 
#include <winsock2.h>
#include <windows.h>
 
using namespace std;
 
struct icmp_header 
{
unsigned char type; // òèï ICMP- ïàêåòà
unsigned char code; // êîä ICMP- ïàêåòà 
unsigned short crc ; // êîíòðîëüíàÿ ñóììà 
unsigned long orig_timestamp; // äîïîëíèòåëüíûå ïîëÿ 
unsigned long recv_timestamp; // óòî÷íÿþùèé òèï
unsigned long trns_timestamp; //ICMP-ïàêåòà
};
/*char message[] = "Hello there!\n";
char msgbuf[1024];*/
struct ip_header
{
unsigned char version; // íîìåð âåðñèè ïðîòîêîëà 
unsigned char tos; // òèï ñåðâèñà 
unsigned short length; // îáùàÿ äëèíà ïàêåòà 
unsigned short id ; // èäåíòèôèêàòîð ïàêåòà
unsigned short flags; // ôëàãè 
unsigned char ttl ; // Âðåìÿ æèçíè ïàêåòà 
unsigned char proto; // Ïðîòîêîë âåðõíåãî óðîâíÿ 
unsigned short crc; // CRC çàãîëîâêà 
unsigned int src_addr; // IP- àäðåñ îòïðàâèòåëÿ 
unsigned int dst_addr; // IP- àäðåñ ïîëó÷àòåëÿ 
}; 
int rs_send_ip (SOCKET mms, struct ip_header iph, char * data, 
int data_length, unsigned short dst_port_raw)
{ 
char * buffer;
int result; 
 struct sockaddr_in addr; 
unsigned char header_length;
unsigned int packet_length;
memset (&addr, 0, sizeof (addr));
  // çàïîëíÿåì ñòðóêòóðó àäðåññà äëÿ ñîêåòà
    addr.sin_family = AF_INET;
    addr.sin_port = htons(80); // èëè ëþáîé äðóãîé ïîðò...
    addr.sin_addr.S_un.S_addr = inet_addr("192.168.73.145");
// Âû÷èñëåíèå äëèíû è çàãîëîâêà ïàêåòà 
header_length = sizeof (struct ip_header); 
packet_length = header_length + data_length; 
// Óñòàíîâêà CRC. 
iph.crc = 0; 
// Çàïîëíåíèå íåêîòîðûõ ïîëåé çàãîëîâêà IP . 
iph.version = header_length / 4 + (unsigned char) atoi ("4") * 16;
// Åñëè äëèíà ïàêåòà íå çàäàíà , òî 
//äëèíà ïàêåòà ïðèðàâíèâàåòñÿ ê äëèíå çàãîëîâêà 
if (!iph.length) iph.length = htons (packet_length); 
buffer =(char *) calloc (packet_length, sizeof (char)); 
// Êîïèðîâàíèå çàãîëîâêà ïàêåòà â áóôåð ( CRC ðàâíî 0). 
memcpy (buffer, &iph, sizeof (struct ip_header));
// Êîïèðîâàíèå äàííûõ â áóôåð 
if (data) memcpy (buffer + header_length, data, data_length); 
 
// Îòïðàâêà IP ïàêåòà â ñåòü.
result = sendto (mms, buffer, packet_length, 0,(struct sockaddr *)
&addr, sizeof (addr));
free (buffer); 
return result;
} 
int main(int argc, char *argv[])
{
    //Èíèöèàëèçàöèÿ áèáëèîòåêè WinSock
    WSADATA wsaData;
 
        int errcod;
        errcod = WSAStartup(MAKEWORD(2, 2), &wsaData);
            if(errcod!=0)
            {
             cout<<"WinSock not found!";
             return 0;
            }
 //Ñîçäàíèå "ñûðîãî" ñîêåòà
  SOCKET mms;
   mms = socket(AF_INET, SOCK_RAW, IPPROTO_UDP);
   struct sockaddr_in addr;
   struct icmp_header icmph;
    if(mms == INVALID_SOCKET)
    {
        cout<<"Error create socket";
    }
    else cout<<"Create socket succesfull";
    // çàïîëíÿåì ñòðóêòóðó àäðåññà äëÿ ñîêåòà
    addr.sin_family = AF_INET;
    addr.sin_port = htons(80); // èëè ëþáîé äðóãîé ïîðò...
    addr.sin_addr.S_un.S_addr = inet_addr("192.168.73.145");
    //äàëåå ñîåäèíåíèå è ïåðåäà÷à ñîîáùåíèÿ
    char * buffer; 
int result; 
unsigned char header_length; 
unsigned int packet_length; 
int data_length=0;
header_length = sizeof (struct icmp_header); 
packet_length = header_length + data_length; 
icmph.crc = 0; 
buffer = (char *)calloc (packet_length, sizeof (char)); 
memcpy (buffer, &icmph, sizeof (struct icmp_header)); 
struct ip_header iph;
   result = rs_send_ip (mms, iph, buffer, packet_length, 0);
free (buffer); 
    /*sendto(mms, msgbuf, sizeof(header)+sizeof(message), 0,
           (struct sockaddr *)&addr, sizeof(addr));*/
    closesocket(mms);
    system("PAUSE");
    return EXIT_SUCCESS;
}