基于C的UDP，TCP网络编程

最新推荐文章于 2024-10-21 12:29:44 发布
转载最新推荐文章于 2024-10-21 12:29:44 发布 · 332 阅读
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 1 #include<iostream> 
2 #include<stdio.h> 
3 #include<sys/socket.h>
 4 #include<unistd.h> 
5 #include<sys/types.h> 
6 #include<netdb.h> 
7 #include<netinet/in.h> 
8 #include<arpa/inet.h> 
9 #include<string.h>
10 using namespace std;
11 int main()
12 {
13     setvbuf(stdout,NULL,_IONBF,0);
14     fflush(stdout);
15     int sock=-1;
16     if((sock=socket(AF_INET,SOCK_DGRAM,0))==-1)
17     {
18         cout<<"sock error"<<endl;
19         return -1;
20     }
21     const int opt=-1;
22     int nb=0;
23nb=setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char*)&opt,sizeof(opt));//设置套接字类
24     if(nb==-1)
25     {
26         cout<<"set socket error...\n"<<endl;
27         return -1;
28     }
29     struct sockaddr_in addrto;
30     bzero(&addrto,sizeof(struct sockaddr_in));
31     addrto.sin_family=AF_INET;
32     addrto.sin_addr.s_addr=htonl(INADDR_BROADCAST);//套接字地址为广播地址
33     addrto.sin_port=htons(6000);//套接字广播端口号为6000
34     int nlen=sizeof(addrto);
35     while(1)
36     {
37         sleep(1);
38         char msg[]={"the message broadcast"};
39         int ret=sendto(sock,msg,strlen(msg),0,(sockaddr*)&addrto,nlen);//向广播地址发布消息
40         if(ret<0)
41         {
42             cout<<"send error...\n"<<endl;
43             return -1;
44         }
45         else 
46         {
47             printf("ok\n");
48         }
49     }
50     return 0;
51 }

 UDP广播客户端代码：

 1 #include<iostream> 
 2 #include<stdio.h>
 3 #include<sys/socket.h>
 4 #include<unistd.h>
 5 #include<sys/types.h>
 6 #include<netdb.h>
 7 #include<netinet/in.h>
 8 #include<arpa/inet.h>
 9 #include<string.h>
 10
 11
 12 using namespace std;
13 int main()
14 {
15         setvbuf(stdout,NULL,_IONBF,0);
16         fflush(stdout);
17         struct sockaddr_in addrto;
18         bzero(&addrto,sizeof(struct sockaddr_in));
19         addrto.sin_family=AF_INET;
20         addrto.sin_addr.s_addr=htonl(INADDR_ANY);
21         addrto.sin_port=htons(6000);
22         socklen_t len=sizeof(addrto);
23         int sock=-1;
24         if((sock=socket(AF_INET,SOCK_DGRAM,0))==-1)
25         {
26                 cout<<"socket error..."<<endl;
27                 return -1;
28         }
29         const int opt=-1;
30         int nb=0;
31         nb=setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char*)&opt,sizeof(opt));
32         if(nb==-1)
33         {
34                 cout<<"set socket errror..."<<endl;
35                 return -1;
36         }
37         if(bind(sock,(struct sockaddr*)&(addrto),len)==-1)
38         {
39                 cout<<"bind error..."<<endl;
40                 return -1;
41         }
42         char msg[100]={0}
;43         while(1)
44         {
45                 int ret=recvfrom(sock,msg,100,0,(struct sockaddr*)&addrto,&len);
46                 if(ret<=0)
47                 {
48                         cout<<"read error..."<<endl;
49                 }
50                 else
51                 {
52                         printf("%s\t",msg);
53                 }
54                 sleep(1);
55         }
56         return 0;
57 }



tcp_server.c
#include <stdio.h>  
#include <sys/types.h>  
#include <sys/socket.h>  
#include <netinet/in.h>  
#include <arpa/inet.h>  
  
int main(int argc, char *argv[])  
{  
    int server_sockfd;//服务器端套接字  
    int client_sockfd;//客户端套接字  
    int len;  
    struct sockaddr_in my_addr;   //服务器网络地址结构体  
    struct sockaddr_in remote_addr; //客户端网络地址结构体  
    int sin_size;  
    char buf[BUFSIZ];  //数据传送的缓冲区  
    memset(&my_addr,0,sizeof(my_addr)); //数据初始化--清零  
    my_addr.sin_family=AF_INET; //设置为IP通信  
    my_addr.sin_addr.s_addr=INADDR_ANY;//服务器IP地址--允许连接到所有本地地址上  
    my_addr.sin_port=htons(8000); //服务器端口号  
      
    /*创建服务器端套接字--IPv4协议，面向连接通信，TCP协议*/  
    if((server_sockfd=socket(PF_INET,SOCK_STREAM,0))<0)  
    {    
        perror("socket");  
        return 1;  
    }  
   
        /*将套接字绑定到服务器的网络地址上*/  
    if (bind(server_sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))<0)  
    {  
        perror("bind");  
        return 1;  
    }  
      
    /*监听连接请求--监听队列长度为5*/  
    listen(server_sockfd,5);  
      
    sin_size=sizeof(struct sockaddr_in);  
      
    /*等待客户端连接请求到达*/  
    if((client_sockfd=accept(server_sockfd,(struct sockaddr *)&remote_addr,&sin_size))<0)  
    {  
        perror("accept");  
        return 1;  
    }  
    printf("accept client %s/n",inet_ntoa(remote_addr.sin_addr));  
    len=send(client_sockfd,"Welcome to my server/n",21,0);//发送欢迎信息  
      
    /*接收客户端的数据并将其发送给客户端--recv返回接收到的字节数，send返回发送的字节数*/  
    while((len=recv(client_sockfd,buf,BUFSIZ,0))>0))  
    {  
        buf[len]='/0';  
        printf("%s/n",buf);  
        if(send(client_sockfd,buf,len,0)<0)  
        {  
            perror("write");  
            return 1;  
        }  
    }  
    close(client_sockfd);  
    close(server_sockfd);  
        return 0;  
}


  

TCP协议：
客户端：tcp_client.c
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#include <stdio.h>  
#include <sys/types.h>  
#include <sys/socket.h>  
#include <netinet/in.h>  
#include <arpa/inet.h>  
  
int main(int argc, char *argv[])  
{  
    int client_sockfd;  
    int len;  
    struct sockaddr_in remote_addr; //服务器端网络地址结构体  
    char buf[BUFSIZ];  //数据传送的缓冲区  
    memset(&remote_addr,0,sizeof(remote_addr)); //数据初始化--清零  
    remote_addr.sin_family=AF_INET; //设置为IP通信  
    remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1");//服务器IP地址  
    remote_addr.sin_port=htons(8000); //服务器端口号  
      
    /*创建客户端套接字--IPv4协议，面向连接通信，TCP协议*/  
    if((client_sockfd=socket(PF_INET,SOCK_STREAM,0))<0)  
    {  
        perror("socket");  
        return 1;  
    }  
      
    /*将套接字绑定到服务器的网络地址上*/  
    if(connect(client_sockfd,(struct sockaddr *)&remote_addr,sizeof(struct sockaddr))<0)  
    {  
        perror("connect");  
        return 1;  
    }  
    printf("connected to server/n");  
    len=recv(client_sockfd,buf,BUFSIZ,0);//接收服务器端信息  
         buf[len]='/0';  
    printf("%s",buf); //打印服务器端信息  
    /*循环的发送接收信息并打印接收信息--recv返回接收到的字节数，send返回发送的字节数*/  
    while(1)  
    {  
        printf("Enter string to send:");  
        scanf("%s",buf);  
        if(!strcmp(buf,"quit")  
            break;  
        len=send(client_sockfd,buf,strlen(buf),0);  
        len=recv(client_sockfd,buf,BUFSIZ,0);  
        buf[len]='/0';  
        printf("received:%s/n",buf);  
    }  
    close(client_sockfd);//关闭套接字  
         return 0;  
}