Question

Implement RPC mechanism for a file transfer across a network in ‘C’.

**********run the program and screenshot************

Answer 1

This is the answer:

.X Code :

const MAXLEN = 1024;

/*
 * Type for storing path
 */
typedef string filename<MAXLEN>;

/*
 * Structure for sending requests. Expects the path of the file
 * and the byte number at which to start reading the file from
 */
struct request {
    filename name;
    int start;
};

/*
 * Type that represents the structure for request
 */
typedef struct request;

/*
 * Type for storing a chunk of the file that is being
 * sent from the server to the client in the current
 * remote procedure call
 */
typedef opaque filechunk[MAXLEN];

/*
 * Response sent by the server to the client as a response
 * to a remote procedure call, containing the file chunk for
 * the current call and number of bytes actually read
 */
struct chunkreceive {
    filechunk data;
    int bytes;
};

/*
 * Type that represents the structure for file's chunks
 * to be received from the server
 */
typedef struct chunkreceive chunkreceive;

/*
 * File data sent by the server from client to store
 * it on the server along with the filename and the
 * number of bytes in the data
 */
struct chunksend {
    filename name;
    filechunk data;
    int bytes;
};

/*
 * Type that represents the structure for file's chunks
 * to be sent to the server 
 */
typedef struct chunk send chunk send;

/*
 * union for returning from remote procedure call returns
 * the proper chunk data response if everything worked fine
 * or will return the error number if an error occurred
 */
union readfile_res switch (int errno) {
    case 0:
        chunkreceive chunk;
    default:
        void;
};

/*
 * Remote procedure defined in the Interface Definition Language
 * of SUN RPC contains PROGRAM and VERSION name definitions and
 * the remote procedure signature
 */
program FTPPROG {
    version FTPVER {
        readfile_res retrieve_file(request *) = 1;
        int send_file(chunksend *) = 2;
    } = 1;
} = 0x20000011;

My Server Code is:

#include <rpc/rpc.h>
#include <stdio.h>
#include "file.h"

extern __thread int errno;

readfile_res* retrieve_file_1_svc(request *req, struct svc_req *rqstp)
{
    FILE *file;
    char data[1024];
    int bytes;
    static readfile_res res;

    file = fopen(req->name, "rb");
    if (file == NULL) {
        res.errno = errno;
        return (&res);
    }

    fseek (file, req->start, SEEK_SET);
    bytes = fread(res.readfile_res_u.chunk.data, 1, 1024, file);

    //res.readfile_res_u.chunk.data = data;
    res.readfile_res_u.chunk.bytes = bytes;

    /*
     * Return the result.
     */
    res.errno = 0;
    fclose(file);
    return (&res);
}
int* send_file_1_svc(chunksend *rec, struct svc_req *rqstp)
{
    FILE *file;
    int write_bytes;
    static int result;

    file = fopen(rec->name, "a");
    if (file == NULL) {
        result = errno;
        return &result;
    }

    write_bytes = fwrite(rec->data, 1, rec->bytes, file);
    fclose(file);

    result = 0;
    return &result;
}

My Client Code should is :

#include <rpc/rpc.h>
#include <stdio.h>
#include <string.h>
#include "file.h"

extern __thread int errno;

int get_file(char *host, char *name)
{
    CLIENT *clnt;
    int total_bytes = 0, write_bytes;
    readfile_res *result;
    request req;
    FILE *file;

    req.name = name;
    req.start = 0;

    /*
     * Create client handle used for calling FTPPROG on
     * the server designated on the command line. Use
     * the TCP protocol when contacting the server.
     */
    clnt = clnt_create(host, FTPPROG, FTPVER, "tcp");
    if (clnt == NULL) {
        /*
         * Couldn't establish a connection with the server.
         * Print an error message and stop.
         */
         clnt_pcreateerror(host);
         exit(1);
    }

    file = fopen(name, "wb");

    /*
     * Call the remote procedure readdir on the server
     */
    while (1) {
        req.start = total_bytes;
        result = retrieve_file_1(&req, clnt);
        if (result == NULL) {
            /*
             * An RPC error occurred while calling the server.
             * Print error message and stop.
             */
            clnt_perror(clnt, host);
            exit(1);
        }

        /*
         * Okay, we successfully called the remote procedure.
         */
        if (result->errno != 0) {
            /*
             * A remote system error occurred.
             * Print error message and stop.
             */
            errno = result->errno;
            perror(name);
            exit(1);
        }

        /*
         * Successfully got a chunk of the file.
         * Write into our local file.
         */
        write_bytes = fwrite(result->readfile_res_u.chunk.data, 1, result->readfile_res_u.chunk.bytes, file);
        total_bytes += result->readfile_res_u.chunk.bytes;
        if (result->readfile_res_u.chunk.bytes < MAXLEN) 
            break;
    }

    fclose(file);

    return 0;
}

int put_file(char *host, char *name)
{
    CLIENT *clnt;
    char data[1024];
    int total_bytes = 0, read_bytes;
    int *result;
    chunksend chunk;
    FILE *file;

    /*
     * Create client handle used for calling FTPPROG on
     * the server designated on the command line. Use
     * the tcp protocol when contacting the server.
     */
    clnt = clnt_create(host, FTPPROG, FTPVER, "tcp");
    if (clnt == NULL) {
        /*
         * Couldn't establish connection with server.
         * Print error message and stop.
         */
         clnt_pcreateerror(host);
         exit(1);
    }

    file = fopen(name, "r");

    chunk.name = name;

    /*
     * Call the remote procedure readdir on the server
     */
    while (1) {
        read_bytes = fread(data, 1, MAXLEN, file);
        total_bytes += read_bytes;

        read_bytes = fread(chunk.data, 1, MAXLEN, file);
        chunk.bytes = read_bytes;
        result = send_file_1(&chunk, clnt);

        if (result == NULL) {
            /*
             * An RPC error occurred while calling the server.
             * Print an error message and stop.
             */
            clnt_perror(clnt, host);
            exit(1);
        }

        /*
         * Okay, we successfully called the remote procedure.
         */
        if (*result != 0) {
            /*
             * A remote system error occurred.
             * Print an error message and stop.
             */
            errno = *result;
            perror(name);
            exit(1);
        }

        /*
         * Successfully got a chunk of the file.
         * Write into our local file. and complete
         */
        if (read_bytes < MAXLEN) 
            break;
    }

    fclose(file);

    return 0;
}

int read_command(char *host)
{
    char command[MAXLEN], filepath[MAXLEN];

    printf("> ");
    fflush(stdin);
    scanf("%s %s", command, filepath);

    if (strcmp(command, "get") == 0) {
        return get_file(host, filepath);
    } else if(strcmp(command, "put") == 0){
        return put_file(host, filepath);
    } else if(strcmp(command, "exit") == 0){
        exit(0);
    } else {
        return -1;
    }
}

int main(int argc, char *argv[])
{
   int result;

   if (argc != 2) {
        fprintf(stderr, "usage: %s host\n", argv[0]);
        exit(1);
   }

   while(TRUE) {
       result = read_command(argv[1]);
   }

   return 0;
}

Output :

You have defined your filechunk type to be an array. You can't assign one array to another array in C. Instead copy the data into the array.

That is the line ,

chunk.data = data;

But in this case you could read directly into that array,

Hence, This is your edited code

 read_bytes = fread(chunk.data, 1, MAXLEN, file);