Мне нужна помощь для моего проекта. Я не силен в этом. вот мой сервер-приемник. это кодирование выполняется для физического ПК. в основном это кодирование на физическом ПК предназначено для получения пакета данных от виртуального приемника. Оно работает. но почему-то у меня была проблема с декодированием информации о пакете, и я нуб во всем этом.
#define HAVE_REMOTE
#define MAX_BUF_SIZE 1024
#define snprintf _snprintf
#define ETH_ALEN 6
#define IP_ALEN 4
#define ARP_REQUEST 1
#define ARP_REPLY 2
#include <stdlib.h>
#include <stdio.h>
#include <winsock2.h>
#include <pcap.h>
#pragma comment(lib, "wpcap.lib")
#pragma comment(lib, "Ws2_32.lib")
// A sample of the select() return value
int recvfromTimeOutUDP(SOCKET socket, long sec, long usec)
{
// Setup timeval variable
struct timeval timeout;
struct fd_set fds;
timeout.tv_sec = sec;
timeout.tv_usec = usec;
// Setup fd_set structure
FD_ZERO(&fds);
FD_SET(socket, &fds);
// Return value:
// -1: error occurred
// 0: timed out
// > 0: data ready to be read
return select(0, &fds, 0, 0, &timeout);
}
int main(int argc, char **argv)
{
WSADATA wsaData;
SOCKET ReceivingSocket;
SOCKADDR_IN ReceiverAddr;
int Port = 5150;
char ReceiveBuf[6000];
int BufLength = 6000;
SOCKADDR_IN SenderAddr;
int SenderAddrSize = sizeof(SenderAddr);
int ByteReceived = 5, SelectTiming, ErrorCode;
char ch = 'Y';
// Initialize Winsock version 2.2
if( WSAStartup(MAKEWORD(2,2), &wsaData) != 0)
{
printf("Server: WSAStartup failed with error %ld\n", WSAGetLastError());
return -1;
}
else
printf("Server: The Winsock DLL status is %s.\n", wsaData.szSystemStatus);
// Create a new socket to receive datagrams on.
ReceivingSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (ReceivingSocket == INVALID_SOCKET)
{
printf("Server: Error at socket(): %ld\n", WSAGetLastError());
// Clean up
WSACleanup();
// Exit with error
return -1;
}
else
printf("Server: socket() is OK!\n");
// Set up a SOCKADDR_IN structure that will tell bind that we
// want to receive datagrams from all interfaces using port 5150.
// The IPv4 family
ReceiverAddr.sin_family = AF_INET;
// Port no. 5150
ReceiverAddr.sin_port = htons(Port);
// From all interface (0.0.0.0)
ReceiverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
// Associate the address information with the socket using bind.
// At this point you can receive datagrams on your bound socket.
if (bind(ReceivingSocket, (SOCKADDR *)&ReceiverAddr, sizeof(ReceiverAddr)) == SOCKET_ERROR)
{
printf("Server: bind() failed! Error: %ld.\n", WSAGetLastError());
// Close the socket
closesocket(ReceivingSocket);
// Do the clean up
WSACleanup();
// and exit with error
return -1;
}
else
printf("Server: bind() is OK!\n");
// Some info on the receiver side...
getsockname(ReceivingSocket, (SOCKADDR *)&ReceiverAddr, (int *)sizeof(ReceiverAddr));
printf("Server: Receiving IP(s) used: %s\n", inet_ntoa(ReceiverAddr.sin_addr));
printf("Server: Receiving port used: %d\n", htons(ReceiverAddr.sin_port));
printf("Server: I\'m ready to receive a datagram...\n");
SelectTiming = recvfromTimeOutUDP(ReceivingSocket, 100, 0);
switch (SelectTiming)
{
case 0:
// Timed out, do whatever you want to handle this situation
printf("Server: Timeout while waiting for client!...\n");
break;
case -1:
// Error occurred, maybe we should display an error message?
// Need more tweaking here and the recvfromTimeOutUDP()...
printf("Server: Some error encountered with code number: %ld\n", WSAGetLastError());
break;
default:
{
while (1)
{
// Call recvfrom() to get it then display the received data...
ByteReceived = recvfrom(ReceivingSocket, ReceiveBuf, BufLength,
0, (SOCKADDR *)&SenderAddr, &SenderAddrSize);
if ( ByteReceived > 0 )
{
printf("\n\nServer: Total Bytes received: %d\n", ByteReceived);
printf("Server: The data is \"%s\"\n", ReceiveBuf);
}
else if ( ByteReceived <= 0 )
printf("Server: Connection closed with error code: %ld\n",
WSAGetLastError());
else
printf("Server: recvfrom() failed with error code: %d\n",
WSAGetLastError());
// Some info on the sender side
getpeername(ReceivingSocket, (SOCKADDR *)&SenderAddr, &SenderAddrSize);
printf("Server: Sending IP used: %s\n", inet_ntoa(SenderAddr.sin_addr));
printf("Server: Sending port used: %d\n", htons(SenderAddr.sin_port));
printf("TIME -", ReceiveBuf);
}
}
}
// When your application is finished receiving datagrams close the socket.
printf("Server: Finished receiving. Closing the listening socket...\n");
if (closesocket(ReceivingSocket) != 0)
printf("Server: closesocket() failed! Error code: %ld\n", WSAGetLastError());
else
printf("Server: closesocket() is OK...\n");
// When your application is finished call WSACleanup.
printf("Server: Cleaning up...\n");
if(WSACleanup() != 0)
printf("Server: WSACleanup() failed! Error code: %ld\n", WSAGetLastError());
else
printf("Server: WSACleanup() is OK\n");
// Back to the system
// system("PAUSE");
return 0;
}
Ниже приведен пример, который я получаю в своем CLI на физическом ПК. Я считаю, что это пакеты, полученные от виртуального приемника. Я был сбит с толку, как мне расшифровать его в
Время|Mac-адрес отправителя|Целевой Mac-адрес|Длина пакета|Тип эфира|Исходный IP-адрес| IP-адрес назначения
Server: Total Bytes received: 4000
Server: The data is "Time : 10:32:24.759385
0050568214540064403a1c000800450000285aeb40007f06b0c4ac10a40bac10f3f3c0990d3d740222860176142f5010054e40620000000000000000"
Server: Sending IP used: 172.16.243.243
Server: Sending port used: 59079
Server: Total Bytes received: 4000
Server: The data is "Time : 10:32:24.759385
0050568214540064403a1c000800450000285aeb40007f06b0c4ac10a40bac10f3f3c0990d3d740222860176142f5010054e40620000000000000000"
Server: Sending IP used: 172.16.243.243
Server: Sending port used: 59080
Как расшифровать анализ информации о пакете?
расшифровать его, что-то вроде этого.
Время|Mac-адрес отправителя|Целевой Mac-адрес|Длина пакета|Тип эфира|Исходный IP-адрес| IP-адрес назначения
