Simulation DNS Server in Network LAP C Language Source Code Programming

Source code DNS server programming in C Language
#include<stdio.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<stdlib.h>
#include<arpa/inet.h>
#include<netinet/in.h>
#include<netdb.h>
#include<string.h>
#include<unistd.h>
#define SER_PORT 8013
int main()
{
int a,c;
FILE *f1,*f2;
int sersock,newsock,n;
char str[25],str2[25],host[25];
void *buf,*buf2;
struct sockaddr_in seraddr;
struct sockaddr_in clinfo;
struct hostent *hp;
socklen_t size=sizeof(clinfo);
seraddr.sin_family=AF_INET;
seraddr.sin_port=htons(SER_PORT);
seraddr.sin_addr.s_addr=htonl(INADDR_ANY);
if((sersock=socket(AF_INET,SOCK_STREAM,0))<0)
{
error(" socket\n");
exit(0);
} if(bind(sersock,(struct sockaddr*)&seraddr,sizeof(seraddr))<0)
{
error(" bind\n");
exit(0);
} if(listen(sersock,1)<0)
{
error(" listen\n");
exit(0);
} if((newsock=accept(sersock,(struct sockaddr*)&clinfo,&size))<0)
{ error(" accept \n");
exit(0);
}
else
printf("connected to m%s \n",inet_ntoa(clinfo.sin_addr));
read(newsock,host,sizeof(host));
printf("%s",host);
hp=gethostbyname(host);
inet_ntop(AF_INET,hp->h_addr,str2,sizeof(str2));
printf("%s\n",str2);
write(newsock,str2,strlen(str2)+1);
close(newsock);
close(sersock);
return 0;
}
Output DNS server
[Linux28@localhost network]$cc dnsserver.c
[Linux28@localhost network]$./a.out
Connected to 192.168.1.111
Local host 127.0.0.1