【Linux/unix网络编程】之使用socket进行TCP编程

实验一 TCP数据发送与接收

【实验目的】

1、熟练掌握套接字函数的使用方法。

2、应用套接字函数完成基本TCP通讯,实现服务器与客户端的信息交互。

【实验学时】

    4学时

【实验内容】

实现一个服务器与一个客户之间通讯。具体功能如下:

(1)服务器端:

服务器端等待客户的连接,一旦连接成功,则显示客户的IP地址、端口号;

循环接收客户发来的信息并在终端上显示,同时在信息前加入序号并返回给客户端;当从客户接收到bye后不再发送给各户并退出程序。

(2)客户端:

根据用户从终端输入的服务器IP地址及端口号连接到相应的服务器;

连接成功后,循环从终端输入信息,并将信息发送给服务器,再从服务器接收信息,并显示在终端上。

当从终端输入bye并发送给服务器后,程序退出。

程序实现:

服务器端:

 1 /*     TcpServer.c  
 2      copyright@msxh 2015/09/21
 3  */
 4 #include <stdio.h>
 5 #include <string.h>
 6 #include <sys/socket.h>
 7 #include <netinet/in.h>
 8 #include <stdlib.h>
 9 
10 int main(){
11 
12     struct sockaddr_in server;
13     struct sockaddr_in client;
14     int listenfd,connetfd;
15     char ip[20];
16     int port;
17     int addrlen;
18     char rebuf[100];
19     char wrbuf[100];
20     char tmp[100];
21     int revlen;
22     /*---------------------socket-------------------*/
23     if((listenfd = socket(AF_INET,SOCK_STREAM,0))== -1){
24         perror("socket() error
");
25         exit(1);
26     }
27 
28     /*----------------------IO-----------------------*/
29     printf("Please input the ip:
");
30     scanf("%s",ip);
31     printf("Please input the port:
");
32     scanf("%d",&port);
33 
34     /*---------------------bind----------------------*/
35     bzero(&server,sizeof(server));
36     server.sin_family = AF_INET;
37     server.sin_port = htons(port);
38     server.sin_addr.s_addr = inet_addr(ip);
39     if(bind(listenfd,(struct sockaddr *)&server,sizeof(server))== -1){
40         perror("bind() error
");
41         exit(1);
42     }
43 
44     /*----------------------listen-------------------*/
45     if (listen(listenfd,5)== -1){
46         perror("listen() error
");
47         exit(1);
48     }
49 
50     /*----------------------accept------------------*/
51     addrlen = sizeof(client);
52     if((connetfd = accept(listenfd,(struct sockaddr *)&client,&addrlen))== -1){
53         perror("accept() error
");
54         exit(1);
55     }
56     /*---------------------show client---------------*/
57     printf("connect successful!
");
58     printf("the client ip is %s,port is %d
",inet_ntoa(client.sin_addr),ntohs(port));
59 
60     /*----------------------read and write----------*/
61     int serial = 0;
62     while(1){
63     bzero(rebuf,sizeof(rebuf));
64     revlen = read(connetfd,rebuf,sizeof(rebuf));
65     if((memcmp("bye",rebuf,3))== 0){
66         printf("Bye-bye then close the connect...
");
67         break;
68     }
69     bzero(wrbuf,sizeof(wrbuf));
70     bzero(tmp,sizeof(tmp));
71     sprintf(tmp,"%d",serial);
72     strcat(tmp,rebuf);
73     bcopy(tmp,wrbuf,strlen(tmp));
74     write(connetfd,wrbuf,sizeof(wrbuf));
75     rebuf[revlen] = '';
76     printf("the info from client is:%s
",rebuf);
77     serial++;
78     }
79 
80     /*----------------------close-------------------*/
81     close(connetfd);
82     close(listenfd);
83 
84     return 0;
85 }

客户端实现:

/*       TcpClient.c
     copyright@msxh 2015/09/21
 */
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdlib.h>

int main(){
    int sockfd;
    char wrbuf[100];
    char ip[20];
    int port;
    int revlen;
    char rebuf[100];
    struct sockaddr_in server;

    /*---------------------socket---------------------*/
    if((sockfd = socket(AF_INET,SOCK_STREAM,0))== -1){
        perror("socket error
");
        exit(1);
    }

    /*---------------------connect--------------------*/
    printf("Please input the ip:
");
    scanf("%s",ip);
    printf("Please input the port:
");
    scanf("%d",&port);
    bzero(&server,sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(port);
    inet_aton(ip,&server.sin_addr);
    if(connect(sockfd,(struct sockaddr *)&server,sizeof(server))== -1){
        perror("connect() error
");
        exit(1);
    }

    /*-----------------------read and write------------------*/
    while(1){
    bzero(wrbuf,sizeof(wrbuf));
    bzero(rebuf,sizeof(rebuf));    
    printf("Please input the info:
");
    scanf("%s",wrbuf);
    if((memcmp("bye",wrbuf,3))== 0){
        write(sockfd,wrbuf,strlen(wrbuf));
        printf("Bye-bye then close the connect...
");
        break;
    }
    //printf("%s
",wrbuf);
    write(sockfd,wrbuf,strlen(wrbuf));
    revlen = read(sockfd,rebuf,sizeof(rebuf));
    rebuf[revlen] = '';
    printf("The info from server is: %s
",rebuf);
    }
    /*------------------------close--------------------------*/
    close(sockfd);

    return 0;
}

makefile文件:

main:tcpserver.c tcpclient.c
    gcc -o tcpserver tcpserver.c
    gcc -o tcpclient tcpclient.c

学习Linux、Unix网络编程时写的第一个程序。。。

原文地址:https://www.cnblogs.com/msxh/p/4900728.html