You are to write a client and server program to transfer a file from a sender to

ID: 3586007 • Letter: Y

Question

You are to write a client and server program to transfer a file from a sender to a receiver using TCP (the receiver is the server, the sender is the client). You are given a template for the sender and receiver and your task is to write the following two functions.

int recvFile(char *fileName, int portNum, int maxSize, int options);

int sendFile(char *fileName, char *destIpAddr, int destPortNum, int options);

There should be no changes needed to main(). The templates are below for tcpFileSend.c and tcpFileRecv.c. Also, submit a screenshot of program build and program execution.

tcpFileSend.c

#define WIN // WIN for Winsock and BSD for BSD sockets

tcpFileRecv.c

Explanation / Answer

Copy the below code in both server and client files.

--------------------------

Server.c

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <signal.h>
#include <ctype.h>
#include <arpa/inet.h>
#include <netdb.h>

#define PORT 20000
#define BACKLOG 5
#define LENGTH 512

void error(const char *msg)
{
perror(msg);
exit(1);
}

int main ()
{
/* Defining Variables */
int sockfd;
int nsockfd;
int num;
int sin_size;
struct sockaddr_in addr_local; /* client addr */
struct sockaddr_in addr_remote; /* server addr */
char revbuf[LENGTH]; // Receiver buffer

/* Get the Socket file descriptor */
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1 )
{
fprintf(stderr, "ERROR: Failed to obtain Socket Descriptor. (errno = %d) ", errno);
exit(1);
}
else
printf("[Server] Obtaining socket descriptor successfully. ");

/* Fill the client socket address struct */
addr_local.sin_family = AF_INET; // Protocol Family
addr_local.sin_port = htons(PORT); // Port number
addr_local.sin_addr.s_addr = INADDR_ANY; // AutoFill local address
bzero(&(addr_local.sin_zero), 8); // Flush the rest of struct

/* Bind a special Port */
if( bind(sockfd, (struct sockaddr*)&addr_local, sizeof(struct sockaddr)) == -1 )
{
fprintf(stderr, "ERROR: Failed to bind Port. (errno = %d) ", errno);
exit(1);
}
else
printf("[Server] Binded tcp port %d in addr 127.0.0.1 sucessfully. ",PORT);

/* Listen remote connect/calling */
if(listen(sockfd,BACKLOG) == -1)
{
fprintf(stderr, "ERROR: Failed to listen Port. (errno = %d) ", errno);
exit(1);
}
else
printf ("[Server] Listening the port %d successfully. ", PORT);

int success = 0;
while(success == 0)
{
sin_size = sizeof(struct sockaddr_in);

/* Wait a connection, and obtain a new socket file despriptor for single connection */
if ((nsockfd = accept(sockfd, (struct sockaddr *)&addr_remote, &sin_size)) == -1)
{
    fprintf(stderr, "ERROR: Obtaining new Socket Despcritor. (errno = %d) ", errno);
exit(1);
}
else
printf("[Server] Server has got connected from %s. ", inet_ntoa(addr_remote.sin_addr));

/*Receive File from Client */
char* fr_name = "/home/aryan/Desktop/receive.txt";
FILE *fr = fopen(fr_name, "a");
if(fr == NULL)
printf("File %s Cannot be opened file on server. ", fr_name);
else
{
bzero(revbuf, LENGTH);
int fr_block_sz = 0;
while((fr_block_sz = recv(nsockfd, revbuf, LENGTH, 0)) > 0)
{
    int write_sz = fwrite(revbuf, sizeof(char), fr_block_sz, fr);
if(write_sz < fr_block_sz)
    {
        error("File write failed on server. ");
    }
bzero(revbuf, LENGTH);
if (fr_block_sz == 0 || fr_block_sz != 512)
{
break;
}
}
if(fr_block_sz < 0)
    {
        if (errno == EAGAIN)
        {
                printf("recv() timed out. ");
            }
            else
            {
                fprintf(stderr, "recv() failed due to errno = %d ", errno);
exit(1);
            }
        }
printf("Ok received from client! ");
fclose(fr);
}

/* Call the Script */
system("cd ; chmod +x script.sh ; ./script.sh");

/* Send File to Client */
//if(!fork())
//{
    char* fs_name = "/home/aryan/Desktop/output.txt";
    char sdbuf[LENGTH]; // Send buffer
    printf("[Server] Sending %s to the Client...", fs_name);
    FILE *fs = fopen(fs_name, "r");
    if(fs == NULL)
    {
        fprintf(stderr, "ERROR: File %s not found on server. (errno = %d) ", fs_name, errno);
exit(1);
    }

    bzero(sdbuf, LENGTH);
    int fs_block_sz;
    while((fs_block_sz = fread(sdbuf, sizeof(char), LENGTH, fs))>0)
    {
        if(send(nsockfd, sdbuf, fs_block_sz, 0) < 0)
        {
            fprintf(stderr, "ERROR: Failed to send file %s. (errno = %d) ", fs_name, errno);
            exit(1);
        }
        bzero(sdbuf, LENGTH);
    }
    printf("Ok sent to client! ");
    success = 1;
    close(nsockfd);
    printf("[Server] Connection with Client closed. Server will wait now... ");
    while(waitpid(-1, NULL, WNOHANG) > 0);
//}
}
}

----------------

Client.c

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