Linux系統tcp模式下服務器與客戶端通信（僅限一個客戶端）

原創

2020-02-21 15:39

//ser.c
#include<stdio.h>
#include<unistd.h>
#include<string.h>
#include<stdlib.h>

#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>

int main()
{
    //1
    int sockSer = socket(AF_INET, SOCK_STREAM, 0);
    if(sockSer == -1)
    {
        perror("socket.");
        exit(1);
    }

    //2
    struct sockaddr_in addrSer;
    addrSer.sin_family = AF_INET;
    addrSer.sin_port = htons(9090);
    //addrSer.sin_addr.s_addr = INADDR_ANY;
    addrSer.sin_addr.s_addr = inet_addr("192.168.1.xx");//服務器地址

    socklen_t addrlen = sizeof(struct sockaddr);

    int yes = 1;
    setsockopt(sockSer, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));

    int ret = bind(sockSer, (struct sockaddr*)&addrSer, addrlen);
    if(ret == -1)
    {
        perror("bind.");
        exit(1);
    }

    //3
    int backlog = 5;
    ret = listen(sockSer, backlog);
    if(ret == -1)
    {
        perror("listen.");
        exit(1);
    }

    //4 
    struct sockaddr_in addrCli;
    int sockConn;
    sockConn = accept(sockSer, (struct sockaddr*)&addrCli, &addrlen);
    if(sockConn == -1)
    {
        printf("Server Accept Client Connect Fail.\n");
        exit(1);
    }
    else
    {
        printf("Server Accept Client Connect Success.\n");
        printf("Client IP:> %s\n",inet_ntoa(addrCli.sin_addr));
        printf("Client Port:>%d\n",ntohs(addrCli.sin_port));
    }

    char sendbuf[256];
    char recvbuf[256];
    while(1)
    {
        printf("Ser:>");
        scanf("%s", sendbuf);
        send(sockConn, sendbuf, strlen(sendbuf)+1, 0);

        recv(sockConn, recvbuf, 256, 0);
        printf("Cli:> %s\n",recvbuf);
    }
    close(sockSer);
    return 0;
}

//cli.c
#include<stdio.h>
#include<unistd.h>
#include<string.h>
#include<stdlib.h>

#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>

int main()
{
    int sockCli = socket(AF_INET, SOCK_STREAM, 0);
    if(sockCli == -1)
    {
        perror("socket.");
        exit(1);
    }

    struct sockaddr_in addrSer;
    addrSer.sin_family = AF_INET;
    addrSer.sin_port = htons(9090);
    addrSer.sin_addr.s_addr = inet_addr("192.168.1.xx");//服務器地址

    struct sockaddr_in addrCli;
    addrCli.sin_family = AF_INET;
    addrCli.sin_port = htons(8080);
    addrCli.sin_addr.s_addr = inet_addr("192.168.1.xx");客戶端地址
    bind(sockCli, (struct sockaddr*)&addrCli, sizeof(struct sockaddr));

    socklen_t addrlen = sizeof(struct sockaddr);
    int ret = connect(sockCli, (struct sockaddr*)&addrSer, addrlen);
    if(ret == -1)
    {
        printf("Client Connect Server Fail.\n");
    }
    else
    {
        printf("Client Connect Server Success.\n");
    }

    char sendbuf[256];
    char recvbuf[256];
    while(1)
    {
        recv(sockCli, recvbuf, 256, 0);
        printf("Ser:>%s\n",recvbuf);

        printf("Cli:>");
        scanf("%s",sendbuf);
        send(sockCli, sendbuf, strlen(sendbuf)+1, 0);
    }
    close(sockCli);
    return 0;
}

只能一個客戶端與服務器連接通訊，並且限制每次發送次數（服務器先一句，客戶端回一句）；後續會改進，不限制發送次數，並且使用多線程使多個客戶端一起與服務器通訊