TCP的socket的服务器端和客户端实例(linux下)

╰+攻爆jí腚メ 2022-01-26 14:57 292阅读 0赞

## TCP的socket的服务器端和客户端实例： ##

1、服务器端步骤：

socket()->bind()->listen()->accept()->read()->write()->close()

2、客户端步骤：

socket()->connect()->write()->read()->close()

### 服务器端代码： ###

#include <sys/socket.h>
    #include <sys/types.h>
    #include <unistd.h> 
    #include <arpa/inet.h>
    #include <netinet/in.h>
    #include <errno.h>
    #include <strings.h>
    #include <ctype.h> 
                 
    char host_name[20];
    int port = 8000;
    
    int main()
    {   
            
            struct sockaddr_in sin,pin;
            int sock_descriptor,temp_sock_descriptor,address_size;
            int i , len , on=1;
            char buf[16384];
        
            sock_descriptor = socket(AF_INET,SOCK_STREAM,0);
            bzero(&sin,sizeof(sin));
            sin.sin_family = AF_INET;
            sin.sin_addr.s_addr = INADDR_ANY;
            sin.sin_port = htons(port);
            if(bind(sock_descriptor,(struct sockaddr *)&sin,sizeof(sin)) == -1)
            {
                    perror("call to bind");
                    exit(1);
            }
            if(listen(sock_descriptor,100) == -1)
            {
                    perror("call to listem");
                    exit(1);
            }
            printf("Accpting connections...\n");
    
            while(1)
            {
                    address_size = sizeof(pin);
                    temp_sock_descriptor = accept(sock_descriptor,(struct sockaddr *)&pin,&address_size);
                    if(temp_sock_descriptor == -1)
                    {
                            perror("call to accept");
                            exit(1);
                    }
                    if(recv(temp_sock_descriptor,buf,16384,0) == -1)
                    {
                            perror("call to recv");
                            exit(1);
                    }
                    inet_ntop(AF_INET,&pin.sin_addr,host_name,sizeof(host_name));
                    printf("received from client(%s):%s\n",host_name,buf);
    
                    len = strlen(buf);
                    for(i = 0 ; i  < len ; i++)
                    {
                            buf[i] =  toupper(buf[i]);
                    }
    
                    if(send(temp_sock_descriptor,buf,len+1,0) == -1)
                    {
                            perror("call to send");
                            exit(1);
    
                    }
                    close(temp_sock_descriptor);
    
    
            }
    
    
    
    }

### 客户端代码： ###

#include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <sys/socket.h>
    #include <sys/types.h>
    #include <unistd.h>
    #include <arpa/inet.h>
    #include <netinet/in.h>
    #include <errno.h>
    #include <strings.h>
    #include <ctype.h>
    
    
    char * host_name = "127.0.0.1";
    int port = 8000;
    
    int main(int argc , char * argv[])
    {
            char buf[8192];
            //char message[256];
            int socket_descriptor;
            struct sockaddr_in pin;
            char * str ="A default test string";
            if(argc < 2)
            {
                    printf("we will send a default test string.\n");
    
            }
            else
            {
                    str = argv[1];
                    if(argc == 3)
                    {
                            host_name = argv[2];
                    }
            }
    
            bzero(&pin,sizeof(pin));
            pin.sin_family = AF_INET;
            inet_pton(AF_INET,host_name,&pin.sin_addr);
            pin.sin_port = htons(port);
            if((socket_descriptor =  socket(AF_INET,SOCK_STREAM,0)) == -1)
            {
                    perror("error opening socket \n");
                    exit(1);
            }
            if(connect(socket_descriptor,(struct sockaddr * )&pin,sizeof(pin)) == -1)
            {
                    perror("error connecting to socket \n");
                    exit(1);
            }
    
            printf("sending message %s to server ..\n",str);
            if( write(socket_descriptor,str,strlen(str)+1) == -1 )
            {
                    perror("error in send \n");
                    exit(1);
            }
    
            printf("..sent message ...wait for message..\n");
            if( read(socket_descriptor,buf,8192) == -1 )
            {
                    perror("error in receiving response from server \n");
                    exit(1);
            }
    
            printf("\nResponse from server:\n\n%s\n",buf);
            close(socket_descriptor);
            return 1;
    
    
    }

### 运行结果： ###

服务器端：

[root@rac2 ~]# ./server_iter 
    Accpting connections...
    received from client(127.0.0.1):A default test string
    received from client(127.0.0.1):yang

客户端：

[root@rac2 ~]# ./client_iter 
    we will send a default test string.
    sending message A default test string to server ..
    ..sent message ...wait for message..
    
    Response from server:
    
    A DEFAULT TEST STRING
    [root@rac2 ~]# ./client_iter yang 127.0.0.1
    sending message yang to server ..
    ..sent message ...wait for message..
    
    Response from server:
    
    YANG
    [root@rac2 ~]#