FTP TCP - File Transfer Protocol - Networks & DBMS Lab - C Program

Program:

// Client Program: ftptcpc.c


#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<fcntl.h>
#include<string.h>
#include<netdb.h>
#include<stdlib.h>

main()
{
    struct sockaddr_in serveraddr;
    int clientsock,n,rdret,length;
    char filename[20],filedata[300];
    bzero((char*)&serveraddr,sizeof(serveraddr));
    serveraddr.sin_family=AF_INET;
    serveraddr.sin_port=2000;
    serveraddr.sin_addr.s_addr=inet_addr("127.0.0.1");
    clientsock=socket(AF_INET,SOCK_STREAM,0);
    if(connect(clientsock,(struct sockaddr*)&serveraddr,sizeof(serveraddr))<0)
    {
        printf("\nError:Cannot connect...");
        exit(0);
    }
    printf("Enter the name of the file : ");
    scanf("%s",filename);
    length=strlen(filename);
    write(clientsock,filename,length);
    rdret=read(clientsock,filedata,300);
    printf("\nThe contents of the file: \n\n");
    printf("%s",filedata);
    close(clientsock);
}

// Server Program: ftptcps.c

#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<fcntl.h>
#include<string.h>
main()
{
    struct sockaddr_in clientaddr,serveraddr;
    int serversock,newserversock,clientsize,n,f,rc;
    char filename[100],filedata[300];
    fflush(stdin);
    serversock=socket(AF_INET,SOCK_STREAM,0);
    bzero((char*)&serveraddr,sizeof(serveraddr));
    serveraddr.sin_family=AF_INET;
    serveraddr.sin_port=2000;
    serveraddr.sin_addr.s_addr=inet_addr("127.0.0.1");
    bind(serversock,(struct sockaddr*)&serveraddr,sizeof(serveraddr));   
    sizeof(serveraddr);
    listen(serversock,5);
    while(1)
    {
        clientsize=sizeof(clientaddr);
        newserversock=accept(serversock,(struct sockaddr*)&clientaddr,&clientsize);
        n=read(newserversock,filename,100);
        filename[n]=0;
        printf("\nThe requested file from the client is  %s.\n",filename);
        //write(1,filename,n);
        f=open(filename,O_RDWR);
        n=read(f,filedata,300);
        printf("\nThe contents of the file: \n\n");
        printf("%s",filedata);
        write(newserversock,filedata,n);
    }
    close(serversock);
    close(newserversock);
}

Output:

Terminal 1: (Client)
nn@linuxmint ~ $ gcc ftptcpc.c -o client
nn@linuxmint ~ $ ./client
Enter the name of the file : ftp.txt

The contents of the file:

FTP: the file transfer protocol
transfers file to/from remote host
client/server model
www.2k8618.blogspot.com
nn@linuxmint ~ $

Terminal 2: (Server)
nn@linuxmint ~ $ gcc ftptcps.c -o server
nn@linuxmint ~ $ ./server

The requested file from the client is  ftp.txt.

The contents of the file:

FTP: the file transfer protocol
transfers file to/from remote host
client/server model
www.2k8618.blogspot.com


 (ftp.txt)
FTP: the file transfer protocol
transfers file to/from remote host
client/server model
www.2k8618.blogspot.com