checking bootp packet

main.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libusb.h>
#include <linux/ip.h>
#include <unistd.h>
#include <sys/stat.h>

#include "rndis.h"
#include "ether2.h"
#include "ipv4.h"
#include "udp.h"
#include "bootp.h"
#include "tftp.h"
#include "arp.h"

#include "utils.h"

int main(int UNUSED argc, const char UNUSED * argv[]) {
	int actual;
	int result;
	int r;

	ssize_t fullSize = sizeof(bootp_packet) + sizeof(udp_t) +
			   sizeof(struct iphdr) + sizeof(struct ethhdr) +
			   sizeof(rndis_hdr);
	ssize_t rndisSize = sizeof(rndis_hdr);
	ssize_t etherSize = sizeof(struct ethhdr);
	ssize_t arpSize = sizeof(arp_hdr);
	ssize_t ipSize = sizeof(struct iphdr);
	ssize_t udpSize = sizeof(udp_t);
	ssize_t bootpSize = sizeof(bootp_packet);
	ssize_t tftpSize = sizeof(tftp_data);

	unsigned char *data = (unsigned char*)calloc(1, 1000);
	unsigned char *buffer = (unsigned char*)malloc(450 *
				sizeof(unsigned char));

	FILE *send;

	libusb_device **devs = NULL;
	libusb_device_handle *dev_handle = NULL;
	libusb_context *ctx = NULL;

	r = libusb_init(&ctx);
	if (r < 0) {
		printf("Init error!\n");
		exit(1);
	}
	libusb_set_debug(ctx, 3);

	while (dev_handle == NULL) {
		r = libusb_get_device_list(ctx, &devs);
		if (r < 0) {
			printf("Cannot get device list.\n");
		}
		dev_handle = libusb_open_device_with_vid_pid(ctx,
							     ROMVID, ROMPID);
		libusb_free_device_list(devs, 1);
	}


	if (libusb_kernel_driver_active(dev_handle, 0) == 1) {
		libusb_detach_kernel_driver(dev_handle, 0);
	}

	r = libusb_claim_interface(dev_handle, 1);
	if (r < 0) {
		printf("Cannot Claim Interface!\n");
		exit(1);
	}

	r = libusb_bulk_transfer(dev_handle, (129 | LIBUSB_ENDPOINT_IN),
				 buffer, 450, &actual, 0);

	rndis_hdr *rndis = (rndis_hdr*)calloc(1, rndisSize);
	make_rndis(rndis, fullSize - rndisSize);

	struct ethhdr *ether = (struct ethhdr*)(buffer+rndisSize);
	struct ethhdr *eth2 = (struct ethhdr*)calloc(1, etherSize);
	make_ether2(eth2, ether->h_source, (unsigned char*)my_hwaddr);


//test
	printf("h_source ");
	for(int i=0; i<6; i++){
		printf("%d-", ether->h_source[i]);
	}
	printf("\n h_dest ");
	for(int i=0; i<6; i++){
		printf("%d-", ether->h_dest[i]);
	}
	printf("\n h_proto ");
	printf("%d \n", ether->h_proto);

  return 0;
}

output

ravi@ravi-Lenovo-G50-45:~/beagle/BBBlfs-orig/bin$ sudo ./usb_flasher
h_source 160-246-253-138-233-26-
 h_dest 255-255-255-255-255-255-
 h_proto 8