UDP ECHO SERVER

PROGRAM:

SERVER SIDE:

#include<stdio.h>

#include<unistd.h>

#include<sys/types.h>

#include<netinet/in.h>

#include<string.h>

#include<sys/socket.h>

#define LOCAL_SERVER_PORT 1500

#define MAX_MSG100

int main(int argc.char *argv[])

{

Int sd,rc,n,clien;

Struct sockaddr_in cliaddr,servaddr;

Char msg[MAX_MSG];

Sd=socket[AF_INET<SOCK_DGRAM,0);

If(sd>0)

{

Printf(“%s cannot open socket\n”,argv[0]);

Exit(0);

}

Servaddr.sin_family=AF_INET;

Servaddr.sin_addr.s_addr=hton1(INADDR_ANY);

Servaddr.sin_port=htons(local_server_port);

Rc=bind(sd,struct sockaddr *)eservaddr,sizeof(servaddr));

If(rc<0)

{

Printf(“%s:cannot bind port number %d \n”);

Argv[0],local_server_port);

Exit(0);

}

if(n<0)

{printf(“%s :cannot receive data\n”);

Continue;

}

Print(“received message is %s”,mag);

}

Return 0;

}

CLIENT SIDE:

#include<stdio.h>

#include<string.h>

#include<sys/types.h>

#include<netinet/in.h>

#include<sys/socket.h>

#define REMOTE_SERVER_PORT 1500

#define MAX_MSG100

Int main(int argc,char *argv[])

{

Int sd,rc,I;

Struct sockaddr_in cliaddr,remote servaddr;

Struct hostenet *h;

If(argc<3)

{

Printf(“usage:%s<server><data1>----<data>\n”.argv[0]);

Exit(1);

}

H=gethostbyname(argv[1]);

TCP SOCKET

PROGRAM:

SERVER SIDE:

#include<stdio.h>

#include<unistd.h>

#include<sys/types.h>

#include<netinet/in.h>

#include<string.h>

#include<sys/socket.h>

int main(int argc.char *argv[])

{

 Int sockfd,portno,new sockfd,clien,n;

Struct sockaddr_in serv_addr,cliaddr;

Struct hostent *server;

Char buffer[256];

If(argc<2)

{

Fprintf(stderr,*error no port provided”);

Exit(1);

}

Sockfd=socket(AF_INET,SOCK_STREAM,0);

If(sockfd,0)

Printerror(”\n error binding”);

Listen(sockfd,s);

Clien=sizeof(cliaddr);

Newsockfd=accept(sockfd,(struct sockaddr*)&cliaddr,&client);

If(newsockfd<0)

Printerror(”\n error on accept”);

Bzero(buffer,256);

N=read(newsockfd,buffer,255);

If(n<0)

Perror(”error reading from the socket”);

Printf(”message %s”,buffer);

N=write(new sockfd,buffer,50);

If(n<0)

Printerror(”\n error waiting to socket”);

Return 0;

Int printerror(char *msg)

{

Perror(msg);

Exit(1);

}

CLIENT SIDE:

#include<stdio.h>

#include<string.h>

#include<sys/types.h>

#include<netinet/in.h>

#include<sys/socket.h>

Int main(int argc,char *argv[])

{

Int sockfd,portno,n;

Struct sockaddr_in serv_addr;

Struct hostent *server;

Char buffer[256];

If(argc<3)

{

Fprintf(stderr,”type%s follwed by host name and then port no(n,”argv[0]);

exit(0);

}

Port no=atoi(argv[2]);

Sockfd=socket[AF_INET,SOCK_STREAM,0);

If(sockfd<0)

Printerror(“error opening socket”);

Server=gethost by name(argv[1]);