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 stringreceived 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 127.0.0.1sending message yang to server ....sent message ...wait for message..Response from server:YANG[root@rac2 ~]#