Linux实验十一(2)---UDP实验

步骤1：同上

步骤2:建立目录

　　 cd workdir/linux/application/12-network/

　　 mkdir udp

　　cd udp

步骤3：复制

　　cp /mnt/hgfs/share/2.\ Linux系统部分/18.\ Linux系统udp网络协议编程实验/实验代码/client.c ./ -a

　　cp /mnt/hgfs/share/2.\ Linux系统部分/18.\ Linux系统udp网络协议编程实验/实验代码/server.c ./ -a

步骤4：执行

　　gcc client.c -o client

　　gcc server.c -o server

　　./server 192.168.100.192 8888

　　新打开终端

　　cd workdir/linux/application/12-network/udp/

　　./client 192.168.100.192 8888

附：程序源码

　　client.c

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

#define N 64

int main(int argc, char *argv[])//./server ip port
{
    int sockfd;
    struct sockaddr_in servaddr;
    char buf[N] = {0};

    if (argc < 3)
    {
        printf("usage:%s ip port\n", argv[0]);
        return 0;
    }

    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
    {
        perror("socket");
        exit(-1);
    }


    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(atoi(argv[2]));//"6000"--6000 htons(6000);
    servaddr.sin_addr.s_addr = inet_addr(argv[1]);
    
    while (1)
    {
        printf(">");
        fgets(buf, N, stdin);
        sendto(sockfd, buf, strlen(buf)+1, 0, (struct sockaddr *) &servaddr, sizeof(servaddr));

        memset(buf, 0, sizeof(buf));
        recvfrom(sockfd, buf, N, 0, NULL, NULL);
        printf("%s\n", buf);
    }
    close(sockfd);

    return 0;
}

　　server.c

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

#define N 64

int main(int argc, char *argv[])//./server ip port
{
    int sockfd;
    struct sockaddr_in myaddr, peeraddr;
    char buf[N] = {0};
    socklen_t len;
    ssize_t n;

    if (argc < 3)
    {
        printf("usage:%s ip port\n", argv[0]);
        return 0;
    }

    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
    {
        perror("socket");
        exit(-1);
    }


    memset(&myaddr, 0, sizeof(myaddr));
    myaddr.sin_family = AF_INET;
    myaddr.sin_port = htons(atoi(argv[2]));//"6000"--6000 htons(6000);
    myaddr.sin_addr.s_addr = inet_addr(argv[1]);
    
    if (bind(sockfd, (struct sockaddr *)&myaddr, sizeof(myaddr)) == -1)
    {
        perror("bind");
        exit(-1);
    }

    memset(&peeraddr, 0, sizeof(peeraddr));
    len = sizeof(peeraddr);

    while (1)
    {
        memset(buf, 0, sizeof(buf));
        n = recvfrom(sockfd, buf, N, 0, (struct sockaddr *)&peeraddr, &len);
        printf("from %s:%d %s\n", inet_ntoa(peeraddr.sin_addr),
                ntohs(peeraddr.sin_port), buf);
        sendto(sockfd, buf, n, 0, (struct sockaddr *)&peeraddr, sizeof(peeraddr));
    }
    close(sockfd);

    return 0;
}