TCP的socket的服务器端和客户端实例(linux下)-蒲公英云

TCP的socket的服务器端和客户端实例(linux下)

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 ~]#