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