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/*
* $smu-mark$
* $name: datafiller.c$
* $author: Salvatore Sanfilippo <antirez@invece.org>$
* $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$
* $license: This software is under GPL version 2 of license$
* $date: Fri Nov 5 11:55:47 MET 1999$
* $rev: 8$
*/
/* $Id: datafiller.c,v 1.2 2003/09/01 00:22:06 antirez Exp $ */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h> /* memset */
#include "hping2.h"
#include "globals.h"
void datafiller(char *p, int size)
{
static int fd = 0;
int readed, diff;
if (!fd) {
fd = open(datafilename, O_RDONLY);
if (fd == -1) {
perror("[datafiller] open()");
fd = 0; /* will retry to open the file for
* the next packet */
memset(p, 'X', size);
return;
}
}
if (p == NULL && fd != -1) { /* seek operation */
/* size-1 because packet with id 1 start from 0 */
lseek(fd, (data_size-signlen)*(size-1), SEEK_SET);
return;
}
restart: /* if EOF occurs, after rewind, restart */
readed = read(fd, p, size);
if (readed == size)
return;
else if (readed == -1) {
perror("[datafiller] read()");
close(fd);
fd = 0; /* will retry to open the file for the next packet */
memset(p, 'X', size);
return;
}
else if (readed < size && opt_end == FALSE) {
lseek(fd, 0, SEEK_SET);
if (readed == 0)
goto restart;
}
else if (readed < size && opt_end == TRUE) {
fprintf(stderr, "EOF reached, wait some second than press "
"ctrl+c\n");
eof_reached = TRUE;
} else {
printf("[datafiller.c INTERNAL ERROR] readed = %d - "
"opt_end == %d\n", readed, opt_end);
exit(1);
}
diff = size - readed;
memset(p+readed, '\0', diff); /* padding */
lseek(fd, 0, SEEK_SET);
return;
}
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