纯IPv4和纯IPv6交互的代码demo

纯IPv4和纯IPv6交互的代码demo可以分为两部分：IPv4服务器与IPv6客户端的交互和IPv6服务器与IPv4客户端的交互。

1. IPv4服务器与IPv6客户端的交互

IPv4服务器端代码：

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

int main(int argc, char *argv[]) {
    int server_sockfd, client_sockfd;
    socklen_t server_len, client_len;
    struct sockaddr_in server_address, client_address;
    char buf[1024];

    // 创建IPv4套接字
    server_sockfd = socket(AF_INET, SOCK_STREAM, 0);

    // 命名套接字
    server_address.sin_family = AF_INET;
    server_address.sin_addr.s_addr = htonl(INADDR_ANY);
    server_address.sin_port = htons(9734);
    server_len = sizeof(server_address);
    bind(server_sockfd, (struct sockaddr *)&server_address, server_len);

    // 创建监听队列
    listen(server_sockfd, 5);

    while (1) {
        printf("server waiting\n");

        // 接受连接
        client_len = sizeof(client_address);
        client_sockfd = accept(server_sockfd, (struct sockaddr *)&client_address, &client_len);

        // 读取数据
        read(client_sockfd, buf, sizeof(buf));
        printf("received: %s\n", buf);

        // 发送数据
        write(client_sockfd, "hello, world\n", 13);

        // 关闭连接
        close(client_sockfd);
    }
    return 0;
}

IPv6客户端代码：

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

int main(int argc, char *argv[]) {
    int sockfd;
    socklen_t len;
    struct sockaddr_in6 address;
    int result;
    char buf[1024];

    // 创建IPv6套接字
    sockfd = socket(AF_INET6, SOCK_STREAM, 0);

    // 初始化IPv6地址
    memset(&address, 0, sizeof(address));
    address.sin6_family = AF_INET6;
    address.sin6_port = htons(9734);
    inet_pton(AF_INET6, "::1", &address.sin6_addr);

    // 连接服务器
    len = sizeof(address);
    result = connect(sockfd, (struct sockaddr *)&address, len);

    if (result == -1) {
        perror("oops: client");
        exit(1);
    }

    // 发送数据
    write(sockfd, "hello, server", 13);

    // 读取数据
    read(sockfd, buf, sizeof(buf));
    printf("received: %s\n", buf);

    // 关闭连接
    close(sockfd);
    return 0;
}

2. IPv6服务器与IPv4客户端的交互

IPv6服务器端代码：

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

int main(int argc, char *argv[]) {
    int server_sockfd, client_sockfd;
    socklen_t server_len, client_len;
    struct sockaddr_in6 server_address, client_address;
    char buf[1024];

    // 创建IPv6套接字
    server_sockfd = socket(AF_INET6, SOCK_STREAM, 0);

    // 命名套接字
    server_address.sin6_family = AF_INET6;
    server_address.sin6_addr = in6addr_any;
    server_address.sin6_port = htons(9734);
    server_len = sizeof(server_address);
    bind(server_sockfd, (struct sockaddr *)&server_address, server_len);

    // 创建监听队列
    listen(server_sockfd, 5);

    while (1) {
        printf("server waiting\n");

        // 接受连接
        client_len = sizeof(client_address);
        client_sockfd = accept(server_sockfd, (struct sockaddr *)&client_address, &client_len);

        // 读取数据
        read(client_sockfd, buf, sizeof(buf));
        printf("received: %s\n", buf);

        // 发送数据
        write(client_sockfd, "hello, world\n", 13);

        // 关闭连接
        close(client_sockfd);
    }
    return 0;
}

IPv4客户端代码：

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

int main(int argc, char *argv[]) {
    int sockfd;
    socklen_t len;
    struct sockaddr_in address;
    int result;
    char buf[1024];

    // 创建IPv4套接字
    sockfd = socket(AF_INET, SOCK_STREAM, 0);

    // 初始化IPv4地址
    memset(&address, 0, sizeof(address));
    address.sin_family = AF_INET;
    address.sin_port = htons(9734);
    inet_pton(AF_INET, "127.0.0.1", &address.sin_addr);

    // 连接服务器
    len = sizeof(address);
    result = connect(sockfd, (struct sockaddr *)&address, len);

    if (result == -1) {
        perror("oops: client");
        exit(1);
    }

    // 发送数据
    write(sockfd, "hello, server", 13);

    // 读取数据
    read(sockfd, buf, sizeof(buf));
    printf("received: %s\n", buf);

    // 关闭连接
    close(sockfd);
    return 0;
}