C++网络编程外网映射tcp

2020-07-16

外网映射

协议要选择tcp，域名之类的无所谓，随便写
一定要先启动那个.bat文件，在启动客户端

C++网络编程

这是server的ip地址和端口号

Server


#include <bits/stdc++.h>
#include <conio.h>
#include <windows.h>
#include <winsock2.h>
#include <time.h>
#pragma comment(lib, "ws2_32.lib")
#define PORT 5000
using namespace std;

DWORD WINAPI DealClientThread(LPVOID lp);

class Server {
private:
    int sockfd;
    int maxListen = 10;
public:
    friend DWORD WINAPI DealClientThread(LPVOID lp);

    int Start() {
        WORD sockVersion = MAKEWORD(2, 2);
        WSADATA wsaData;
        if (WSAStartup(sockVersion, &wsaData) != 0) {
            return 0;
        }

        sockfd = socket(AF_INET, SOCK_STREAM, 0);
        if (sockfd < 0) {
            printf("create socket err\n");
            return -1;
        }
        else    printf("create socket success\n");

        struct sockaddr_in serAddr;
        memset(&serAddr, 0, sizeof(serAddr));
        serAddr.sin_family = AF_INET;
        serAddr.sin_port = htons(PORT);
        serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

        int res = bind(sockfd, (struct sockaddr*)&serAddr, sizeof(serAddr));
        if (res < 0) {
            printf("bind err\n");
            return -1;
        }
        else    printf("bind success\n");

        res = listen(sockfd, maxListen);
        if (res < 0) {
            printf("listen err\n");
            return -1;
        }
        else    printf("listen success\n");

        while (1) {
            int newLink = accept(sockfd, NULL, NULL);
            if (newLink < 0) {
                printf("accept err\n");
                return -1;
            }
            else    printf("accept success\n");

            DWORD threadID;
            CreateThread(NULL, 0, DealClientThread, &newLink, 0, &threadID);
        }

        return 0;
    }

    int ReceiveData(int newLink) {
        char recvLen[100] = {0};

        while (1) {
            int res = recv(newLink, recvLen, 4, 0);
            int recvLength = atoi(recvLen);
            if (res < 0) {
                printf("recv err\n");
                return -1;
            }
            if (res == 0) {
                return 0;
            }
            printf("recv dataLength = [%d] success\n", recvLength);

            char *recvBuf = (char*)malloc(recvLength + 1);
            memset(recvBuf, 0, recvLength + 1);
            res = recv(newLink, recvBuf, recvLength + 1, 0);
            if (res < 0) {
                printf("recv err\n");
                return -1;
            }
            else    printf("recv data = [%s] success\n", recvBuf);

            SendData(newLink, recvBuf);

            free(recvBuf);
            recvBuf = NULL;
        }
        return 0;
    }

    int SendData(int newLink, char *sendBuf) {
        int sendBufLength = strlen(sendBuf);

        int res = send(newLink, sendBuf, sendBufLength, 0);
        if (res < 0) {
            printf("send err\n");
            return -1;
        }
        else    printf("send [%s] success\n", sendBuf);
    }

    void CloseServer() {
        closesocket(sockfd);
    }
} server;

DWORD WINAPI DealClientThread(LPVOID lp) {
    int newLink = *(int *)lp;
    server.ReceiveData(newLink);
    return 0;
}

int main () {
    server.Start();
    server.CloseServer();
    system("pause");
    return 0;
}

这是client的ip地址和端口号
把域名复制下来(不要后面的 :[端口号]), 然后打开cmd ping一下只能知道ip地址了

Client

#include <bits/stdc++.h>
#include <conio.h>
#include <windows.h>
#include <winsock2.h>
#include <time.h>
#pragma comment(lib, "ws2_32.lib")
#define PORT 4643
using namespace std;

class Client {
private:
    int sockfd;
    int sendBufLength = 0;
    char sendBuf[1000] = {0};
    char sendLen[100] = {0};
    char ip[100] = "47.92.102.131";///"192.168.0.101";
public:
    void SetIP(char *newIP) {
        if (strcmp(newIP, "") != 0) {
            strcpy(ip, newIP);
        }
    }

    void CinSendBuf() {
        memset(sendBuf, 0, sizeof(sendBuf));
        gets(sendBuf);
        sendBufLength = strlen(sendBuf);
        sprintf(sendLen, "%04d", sendBufLength);
    }

    int InitClienNet() {
        WORD sockVersion = MAKEWORD(2, 2);
        WSADATA wsaData;
        if (WSAStartup(sockVersion, &wsaData) != 0) {
            return 0;
        }

        sockfd = socket(AF_INET, SOCK_STREAM, 0);
        if (sockfd < 0) {
            printf("create socket err\n");
            return -1;
        }
        else    printf("create socket success\n");

        struct sockaddr_in serAddr;
        memset(&serAddr, 0, sizeof(serAddr));
        serAddr.sin_family = AF_INET;
        serAddr.sin_port = htons(PORT);
        serAddr.sin_addr.S_un.S_addr = inet_addr("47.92.102.131");

        int res = connect(sockfd, (struct sockaddr*)&serAddr, sizeof(serAddr));
        if (res < 0) {
            printf("create connect err\n");
            return -1;
        }
        else    printf("create connect success\n");
    }

    int SendData() {
        int res = send(sockfd, sendLen, 4, 0);
        if (res < 0) {
            printf("send err\n");
            return -1;
        }
        else    printf("send [%s] success\n", sendLen);

        res = send(sockfd, sendBuf, sendBufLength, 0);
        if (res < 0) {
            printf("send err\n");
            return -1;
        }
        else    printf("send [%s] success\n", sendBuf);
        ReceiveData();
    }

    int ReceiveData() {
        char recvBuf[100] = {0};
        int res = recv(sockfd, recvBuf, 100, 0);
        if (res < 0) {
            printf("recv err\n");
            return -1;
        }
        else    printf("recv data = [%s] success\n", recvBuf);

        return 0;
    }

    void CloseSocket() {
        closesocket(sockfd);
    }
} client;

int main () {
    client.InitClienNet();
    while (1) {
        client.CinSendBuf();
        client.SendData();
    }
    client.CloseSocket();
    system("pause");
    return 0;
}