server.cpp

Linux Socket 框架

#include "asocket.h"
 

#define SERVER_PORT 20000 // define the defualt connect port id

#define LENGTH_OF_LISTEN_QUEUE 10 //length of listen queue in server

#define BUFFER_SIZE 255

#define WELCOME_MESSAGE "welcome to connect the server. "

 

 

int main(int argc, char **argv)

{

       int servfd,clifd;

       struct sockaddr_in servaddr,cliaddr;

 

       if ((servfd = socket(AF_INET,SOCK_STREAM,0)) < 0)

       {

              printf("create socket error!\n");

              exit(1);

       }

       bzero(&servaddr,sizeof(servaddr));

       servaddr.sin_family = AF_INET;

       servaddr.sin_port = htons(SERVER_PORT);

       servaddr.sin_addr.s_addr = htons(INADDR_ANY);

 

       if (bind(servfd,(struct sockaddr*)&servaddr,sizeof(servaddr))<0)

       {

              printf("bind to port %d failure!\n",SERVER_PORT);

              exit(1);

       }

 

       if (listen(servfd,LENGTH_OF_LISTEN_QUEUE) < 0)

       {

              printf("call listen failure!\n");

              exit(1);

       }

 

       while (1)

       {//server loop will nerver exit unless any body kill the process

              char buf[BUFFER_SIZE];

              long timestamp;

              socklen_t length = sizeof(cliaddr);

              clifd = accept(servfd,(struct sockaddr*)&cliaddr,&length);

              if (clifd < 0)

              {

                     printf("error comes when call accept!\n");

                     break;

              }

              strcpy(buf,WELCOME_MESSAGE);

              //inet_ntop(INET_ADDRSTRLEN,cliaddr.sin_addr,buf,BUFFER_SIZE);

              

              printf("from client,IP:%s,Port:%d\n",inet_ntoa(cliaddr.sin_addr),ntohs(cliaddr.sin_port));

              timestamp = time(NULL);

              strcat(buf,"timestamp in server:");

              strcat(buf,ctime(&timestamp));

              send(clifd,buf,BUFFER_SIZE,0);

              close(clifd);           

              

       }//exit

       close(servfd);

       return 0;

}