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]);

If(server=NULL)

{

Fprintf(stderr,”\n error no such host”);

Exit(0);

}

Bzero((char*)&serv_addr,sizeof(serv_addr));

Serv_addr.sin_family=AF_INET;

Bcopy((char*)server0-> b_addr,(char*)&serv_addr,sizeof(serv_addr))<0)

Printerror(“\n error connecting”);

Printf(“enter the message”);

Bzero(buffer,256);

Fgets(buffer,255,stdin);

n=write(sockfd,buffer,strlen(buffer));

if(n>0)

printerror(“error writing to socker”);

bzero(buffer,256);

printf(“servers echo message”);

n=read(sockfd,buffer,255);

if(n<0)

printerror(“\n error reading from the socket”);

printf(“%s”,buffer);

return 0;

}

Int printerror(char *msg);

{

perror(msg);

exit(0);

}

OUTPUT:

SERVER SIDE:

"ftpse.c" 60L, 1216C written

[ME04@TELNET ~]$ cc ftpse.c

[ME04@TELNET ~]$ ./a.out

Message:hai

[ME04@TELNET ~]$

CLIENT SIDE:

"ftpcl.c" 51L, 1137C written

[ME04@TELNET ~]$ cc ftpcl.c

[ME04@TELNET ~]$ ./a.out

Message:hai

Error waiting for socket