[国嵌攻略][092][UDP网络程序设计]

server.c

#include <sys/socket.h>
#include <netinet/in.h>
#include <strings.h>
#include <stdio.h>

#define SERVER_PORT 3333

void main(){
    //创建标识
    int serverfd;

    serverfd = socket(AF_INET, SOCK_DGRAM, );   //建立UDP连接

    //绑定地址
    struct sockaddr_in serverAddr;

    serverAddr.sin_family = AF_INET;                   //设置协议
    serverAddr.sin_port = htons(SERVER_PORT);          //设置端口
    serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);    //设置地址
    bzero(serverAddr.sin_zero, );                     //设置为零

    bind(serverfd, (struct sockaddr *)&serverAddr, sizeof(struct sockaddr));

    //接收数据
    char buffer[];
    struct sockaddr_in clientAddr;
    socklen_t clientAddrLen;

    clientAddrLen = sizeof(struct sockaddr);
    recvfrom(serverfd, buffer, sizeof(buffer), , (struct sockaddr *)&clientAddr, &clientAddrLen);

    //显示数据
    char *clientIPAddr;

    clientIPAddr = (char *)inet_ntoa(clientAddr.sin_addr.s_addr);
    printf("server recvice from %s:\n%s", clientIPAddr, buffer);

    //关闭连接
    close(serverfd);
}

client.c

#include <sys/socket.h>
#include <netinet/in.h>
#include <strings.h>
#include <stdio.h>

#define SERVER_PORT 3333

int main(int argc, char **argv){
    //参数检查
    if(argc != ){
        printf("Usage:\n\t%s <ip address>\n", argv[]);
        return -;
    }

    //创建标识
    int clientfd;

    clientfd = socket(AF_INET, SOCK_DGRAM, );   //建立UDP连接

    //输入数据
    char buffer[];

    printf("client send to %s:\n", argv[]);
    fgets(buffer, sizeof(buffer), stdin);

    //发送数据
    struct sockaddr_in serverAddr;

    serverAddr.sin_family = AF_INET;                   //设置协议
    serverAddr.sin_port = htons(SERVER_PORT);          //设置端口
    serverAddr.sin_addr.s_addr = inet_addr(argv[]);   //设置地址
    bzero(serverAddr.sin_zero, );                     //设置为零

    sendto(clientfd, buffer, sizeof(buffer), , (struct sockaddr *)&serverAddr, sizeof(struct sockaddr));

    //关闭连接
    close(clientfd);

    return ;
}