生成基於C语言的tcp和udp通信服務器代碼

很高兴为您解答此问题。下面是一个使用C语言编写的TCP和UDP通信服务器代码示例：

TCP服务器代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>

int main(int argc, char *argv[])
{
    int listen_sock, conn_sock;
    struct sockaddr_in server_addr, client_addr;
    char buf[1024];
    int bytes_read;

    // 创建套接字
    listen_sock = socket(AF_INET, SOCK_STREAM, 0);
    if (listen_sock == -1) {
        perror("socket() failed");
        exit(1);
    }

    // 设置地址重用
    int reuse = 1;
    if (setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) == -1) {
        perror("setsockopt() failed");
        exit(1);
    }

    // 绑定地址
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(8080);
    if (bind(listen_sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("bind() failed");
        exit(1);
    }

    // 开始监听
    if (listen(listen_sock, 5) == -1) {
        perror("listen() failed");
        exit(1);
    }

    printf("Waiting for connections...\n");

    // 接受连接
    socklen_t client_addr_len = sizeof(client_addr);
    conn_sock = accept(listen_sock, (struct sockaddr *)&client_addr, &client_addr_len);
    if (conn_sock == -1) {
        perror("accept() failed");
        exit(1);
    }

    printf("Connection from %s:%d established\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));

    // 接收数据并发送回复
    while ((bytes_read = recv(conn_sock, buf, sizeof(buf), 0)) > 0) {
        printf("Received %d bytes from client\n", bytes_read);
        send(conn_sock, buf, bytes_read, 0);
    }

    if (bytes_read == 0) {
        printf("Connection closed by client\n");
    } else {
        perror("recv() failed");
    }

    close(conn_sock);
    close(listen_sock);

    return 0;
}

UDP服务器代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>

int main(int argc, char *argv[])
{
    int sock;
    struct sockaddr_in server_addr, client_addr;
    char buf[1024];
    int bytes_read;

    // 创建套接字
    sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock == -1) {
        perror("socket() failed");
        exit(1);
    }

    // 设置地址重用
    int reuse = 1;
    if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) == -1) {
        perror("setsockopt() failed");
        exit(1);
    }

    // 绑定地址
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(8080);
    if (bind(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("bind() failed");
        exit(1);
    }

    printf("Listening on port %d...\n", ntohs(server_addr.sin_port));

    // 循环处理请求
    while (1) {
        socklen_t client_addr_len = sizeof(client_addr);
        bytes_read = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *)&client_addr, &client_addr_len);
        if (bytes_read == -1) {
            perror("recvfrom() failed");
            continue;
        }

        printf("Received %d bytes from %s:%d\n", bytes_read, inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
        printf("Message: %.*s\n", bytes_read, buf);

        // 发送回复
        sendto(sock, buf, bytes_read, 0, (struct sockaddr *)&client_addr, client_addr_len);
        printf("Reply sent\n");
    }

    close(sock);

    return 0;
}

希望这些代码可以帮助到您。