I want drop packet by C++

EDN Admin · Sep 14, 2012

<span style="font-family:Verdana,Arial,sans-serif; font-size:13px; line-height:normal Currently, I have captured packet network card using C++ by Winsocks<br style="font-family:Verdana,Arial,sans-serif; font-size:13px; line-height:normal
<span style="font-family:Verdana,Arial,sans-serif; font-size:13px; line-height:normal So ,I want to drop packets using C ++ based on the destination IP address<br style="font-family:Verdana,Arial,sans-serif; font-size:13px; line-height:normal
<span style="font-family:Verdana,Arial,sans-serif; font-size:13px; line-height:normal help me

#include <conio.h> 
#include <string> 
#include <cstring> 
#include <stdio.h> 
#include <iostream> 
#define MAX_PACKET_SIZE 65525 
#include <winsock2.h> 
#include <mstcpip.h> 
#include <ws2tcpip.h>
using namespace std;
typedef struct iphdr1 
{ 
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re unsigned char VerIHL; //Version and IP Header Length 
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re unsigned char Tos; 
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re unsigned short Total_len; 
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re unsigned short ID; 
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re unsigned short Flags_and_Frags; //Flags 3 bits and Fragment offset 13 bits 
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re unsigned char TTL; 
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re unsigned char Protocol; 
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re unsigned short Checksum; 
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re unsigned long SrcIP; 
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re unsigned long DstIP; 
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re //unsigned long Options_and_Padding; 
} IpHeader1; 
 
typedef struct port 
{ 
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re unsigned short SrcPort; 
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re unsigned short DstPort; 
} TcpUdpPort; 
 
void ProcessPacket(char* Buffer, int Size) 
{ 
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re IpHeader1 *iphdr1; 
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re TcpUdpPort *port; 
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re struct sockaddr_in SockAddr; 
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re unsigned short iphdrlen; 
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re char C; 
 
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re iphdr1 = (IpHeader1 *)Buffer; 
 
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re iphdrlen = (iphdr1->VerIHL << 4); 
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re memcpy(&C, &iphdrlen, 1); 
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re iphdrlen = (C >> 4) * 4; //20 
 
 
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re memset(&SockAddr, 0, sizeof(SockAddr)); 
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re SockAddr.sin_addr.s_addr = iphdr1->SrcIP; 
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re printf("Packet From: %s ", inet_ntoa(SockAddr.sin_addr)); 
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re memset(&SockAddr, 0, sizeof(SockAddr)); 
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re SockAddr.sin_addr.s_addr = iphdr1->DstIP; 
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re printf("To: %s ", inet_ntoa(SockAddr.sin_addr)); 
 
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re switch (iphdr1->Protocol) 
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re { 
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re case 1: 
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re printf("Protocol: ICMP "); 
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re break; 
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re case 2: 
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re printf("Protocol: IGMP "); 
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re break; 
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re case 6: 
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re printf("Protocol: TCP "); 
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re if (Size > iphdrlen) 
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re { 
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re port = (TcpUdpPort *)(Buffer + iphdrlen); 
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re printf("From Port: %i To Port: %i ", ntohs(port->SrcPort), ntohs(port->DstPort)); 
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re } 
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re break; 
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re case 17: 
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re printf("Protocol: UDP "); 
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re if (Size > iphdrlen) 
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re { 
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re port = (TcpUdpPort *)(Buffer + iphdrlen); 
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re printf("From Port: %i To Port: %i ", ntohs(port->SrcPort), ntohs(port->DstPort)); 
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re } 
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re break; 
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re default: 
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re printf("Protocol: %i ", iphdr1->Protocol); 
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re } 
 
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re printf("n"); 
} 
 
void StartSniffing(SOCKET Sock) 
{ 
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re char *RecvBuffer = (char *)malloc(MAX_PACKET_SIZE + 1); 
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re int BytesRecv, FromLen; 
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re struct sockaddr_in From; 
 
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re if (RecvBuffer == NULL) 
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re { 
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re printf("malloc() failed.n"); 
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re exit(-1); 
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re } 
 
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re FromLen = sizeof(From); 
 
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re do 
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re { 
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re memset(RecvBuffer, 0, MAX_PACKET_SIZE + 1); 
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re memset(&From, 0, sizeof(From)); 
 
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re BytesRecv = recvfrom(Sock, RecvBuffer, MAX_PACKET_SIZE, 0, (sockaddr *)&From, &FromLen); 
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re printf("BytesRecv la:%i",BytesRecv); 
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re if (BytesRecv > 0) 
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re { 
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re ProcessPacket(RecvBuffer, BytesRecv); 
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re } 
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re else 
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re { 
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re printf( "recvfrom() failed.n"); 
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re } 
 
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re } while (BytesRecv > 0); 
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re free(RecvBuffer); 
} 
/////////////////////////////////////////////// 
char* GetLocalAddress() 
{ 
// WSADATA wsaData; 
struct hostent *remoteHost; 
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re struct in_addr addr; 
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re int i=0; 
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re //WSAStartup(MAKEWORD(2, 2), &wsaData); 
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re char* buffer=""; 
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re gethostname (buffer,strlen(buffer)); 
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re remoteHost = gethostbyname(buffer); 
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re if (remoteHost == NULL) 
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re { 
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re printf("ko tim thay :"); 
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re } 
else 
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re { 
//printf("tOfficial name: %sn", remoteHost->h_name); 
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re addr.s_addr = *(u_long *) remoteHost->h_addr_list[i++]; 
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re //printf("tIP Address #%d: %sn", i, inet_ntoa(addr)); 
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re return (char*)inet_ntoa(addr); 
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re } 
 
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re 
} 
//////////////////////////////////////////////// 
void main() 
{ 
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re WSAData wsaData; 
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re SOCKET Sock; 
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re struct sockaddr_in SockAddr; 
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re DWORD BytesReturned; 
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re int I = 1; 
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re try 
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re { 
 
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re if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) 
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re { 
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re printf("WSAStartup() failed.n"); 
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re exit(-1); 
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re } 
 
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re Sock = socket(AF_INET, SOCK_RAW, IPPROTO_IP); 
 
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re if (Sock == INVALID_SOCKET) 
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re { 
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re printf("socket() failed.n"); 
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re exit(-1); 
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re } 
 
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re memset(&SockAddr, 0, sizeof(SockAddr)); 
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re //SockAddr.sin_addr.s_addr = inet_addr(BIND2IP); 
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re SockAddr.sin_addr.s_addr = inet_addr(GetLocalAddress()); 
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re SockAddr.sin_family = AF_INET; 
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re SockAddr.sin_port = 0; 
 
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re if (bind(Sock, (sockaddr *)&SockAddr, sizeof(SockAddr))== SOCKET_ERROR) 
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re { 
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re printf("bind(%s) failed.n", GetLocalAddress()); 
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re exit(-1); 
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re } 
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re if (WSAIoctl(Sock, SIO_RCVALL, &I, sizeof(I), NULL, NULL, &BytesReturned, NULL, NULL) == SOCKET_ERROR) 
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re { 
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re printf("WSAIoctl() failed.n"); 
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re exit(-1); 
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re } 
 
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re StartSniffing(Sock); 
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re } 
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re catch (...) 
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re { 
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re printf("CRASHn"); 
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re } 
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re closesocket(Sock); 
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re WSACleanup();<span style="white-space

re
 
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re getch(); 
} 
 
/////////////////////////////////////////////////////////////////////////////////// 

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I want drop packet by C++

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