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I have a Java app (not written by me) which uses javax.crypto to encrypt and decrypt file.



public static final String PROVIDER = "BC";
public static final int SALT_LENGTH = 32;
...

Thanks Andi :-) i will solve this after the padding problem ;-)
@Salem: so the correct flow for the encryption program could be:
1) read the file size, divide it by 16 and get the number of total...

Encryption program:


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gcrypt.h>


#define GCRYPT_VERSION "1.5.0"

Also remember to alwasy check the return value of a function.
In your case you have to check the ret. val. of fgets and strstr :)

A little tip: use always:
int main(void)neither
main()nor
int main() :)

I've found the bug :) The problem was that i had a

recv(f_sockd, buf, sizeof(buf), 0);
where buf is
char buf[256] but the real received buf was only 5 chars!
So i have changed the above...

Hello :)
1) i've deleted only the checks of the open and stat calls (if ... < 0 then error):)
2) the other 3d is for another problem :)
3) thanks, i was desperate so i've tried all without know...

the problem is into my program because i've tried to code a small socket program that exchange an int (send(sock, &val, sizeof(val), 0)) and it works perfectly -.-''

The program works perfectly the only problem is when i have to send the file size because it doesn't works :(

yes, i've used it!

I know but it is only a personal project to understand and study C (and network programming) :)
However I have built them with "make"!
And no, "asdk" isn't in any file i've used xD

./ftpserver 2000
./ftpclient localhost 2000

no! i'm doing some test and only me are connected to my network :)

I'm running client and server on the same machine with Ubuntu 12.04-amd64 (errors checking have been deleted).

Server send:

uint32_t fsize;
struct stat fileStat;
fd = open(filename,...

This part of code is for the client. It need to receive first the file size and then the size:


void do_retr_cmd(int f_sockd){
int fd;
ssize_t nread = 0;
uint32_t fsize, fsize_tmp,...

i've solved :D
the problem was that i have to put offset_list = 0; BEFORE every call to sendfile :)

With this it doesn't works :(


send_again:
rc_list = sendfile(newsockd, fpl, &offset_list, fileStat.st_size);
if(rc_list == -1){
perror("Invio file list non riuscito");
...

This is the part of the ftp cmd "LIST" :

if(recv(newsockd, buffer, 5, 0) < 0){
perror("Errore nella ricezione comando LIST");
onexit(newsockd, sockd, 0, 2);
}
other =...

Gooooood it woooooooooorks :D :D :D :D :D :D
you're a fukin genius :D :D

again fsize! So i have to change

nread = read(sockd, filebuffer, fsize)
to

nread = read(sockd, filebuffer, fsize_tmp)
where


fsize_tmp = fsize

Also with fsize instead of sizeof(filebuffer) i got the messages problem :(

This is a snippet of my client code:


while(((uint32_t)total_bytes_read != fsize) && ((nread = read(sockd, filebuffer, sizeof(filebuffer))) > 0)){
if(write(fd, filebuffer, nread) < 0){
...

I have a doubt if to use `goto` or `pointer to a function` into my code. Here a pseuco C code using goto:



/* code that read the answer */
switch-case:
switch(answer)
case LIST:
goto...

In fact this is a (very small) ftp client and server. Only USER PASS LIST CD CWD RETR have been developed :)
And also thanks to all, i will study struct better once i've finished this project!! :)

What you have write it is too hard for me xD i'm "developing" in C since May 2012 :)
i have not completely understand "how and when to use struct" so i don't use them (for now) ;)