Udp
Server
// UDP Server(palindrome)
#include<stdio.h>
#include<string.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<stdlib.h>
main() {
struct sockaddr_in client,server; int lfd,n;
char rBuf[100]="",sBuf[100]="";
lfd=socket(AF_INET,SOCK_DGRAM,0);
server.sin_family=AF_INET;
server.sin_port=2001;
server.sin_addr.s_addr=inet_addr("127.0.0.1");
bind(lfd,(struct sockaddr *)&server,sizeof server);
printf("\nServer ready,waiting for client....\n");
n=sizeof client;
recvfrom(lfd,rBuf,sizeof rBuf,0,(struct sockaddr *)&client,&n);
printf("\nClient:%s",rBuf);
int num=atoi(rBuf);
int rev=0,rem,copy=num;
while(num!=0){
rem=num%10;
rev=rev*10+rem;
num=num/10;
}
if (copy == rev)
strcpy(sBuf,"palindrome");
else
strcpy(sBuf,"not palindrome");
printf("\nServer: %s\n",sBuf);
sendto(lfd,sBuf,sizeof sBuf,0,(struct sockaddr *)&client,n);
close(lfd);
}
Client
// UDP Client
(For palindrome )
#include<stdio.h>
#include<string.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
main() {
struct
sockaddr_in server;
int lfd,n;
char rBuf[100]="",sBuf[100]="";
lfd=socket(AF_INET,SOCK_DGRAM,0);
server.sin_family=AF_INET;
server.sin_port=2001;
server.sin_addr.s_addr=inet_addr("127.0.0.1");
printf("\nClient ready....\n");
n=sizeof server;
printf("\nClient:");
gets(sBuf);
sendto(lfd,sBuf,sizeof sBuf,0,(struct sockaddr *)&server,n);
recvfrom(lfd,rBuf,sizeof rBuf,0,(struct sockaddr *)&server,&n);
printf("\nServer:%s",rBuf);
close(lfd);
}
Chat(any no of messages can be sent ,terminate by sending “exit” from client )
TCP
SERVER
// TCP Chat : Server(chat program)
//type "exit" from client side to terminate
#include<stdio.h>
#include<string.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<stdlib.h>
main()
{
struct sockaddr_in client,server;
int lfd,n,confd;
char rBuf[100]="",sBuf[100]="";
lfd=socket(AF_INET,SOCK_STREAM,0);
server.sin_family=AF_INET;
server.sin_port=2000;
server.sin_addr.s_addr=inet_addr("127.0.0.1");
bind(lfd,(struct sockaddr *)&server,sizeof server);
listen(lfd,1);
printf("\nServer ready,waiting for client....\n");
n=sizeof client; confd=accept(lfd,(struct sockaddr *)&client,&n);
while(1){
recv(confd,rBuf,sizeof rBuf,0);
printf("\nClient:%s",rBuf);
if(strcmp(rBuf,"exit")==0)
break;
printf("\nServer: ");
gets(sBuf);S
send(confd,sBuf,sizeof sBuf,0);
printf("\n");
}
close(confd);
close(lfd);
}
CLIENT
// TCP Chat : Client(for chat)
#include<stdio.h>
#include<string.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
main() {
struct sockaddr_in server;
int lfd;
char rBuf[100]="",sBuf[100]="";
lfd=socket(AF_INET,SOCK_STREAM,0);
server.sin_family=AF_INET;
server.sin_port=2000;
server.sin_addr.s_addr=inet_addr("127.0.0.1");
printf("\nClient ready....\n");
connect(lfd,(struct sockaddr *)&server,sizeof server);
while(1){
printf("\nClient:");
gets(sBuf);
send(lfd,sBuf,sizeof sBuf,0);
if(strcmp(sBuf,"exit")==0)
break;
recv(lfd,rBuf,sizeof rBuf,0);
printf("\nServer:%s",rBuf);
printf("\n");
}
close(lfd);
