avr/qmk/firmware - [no description]

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/*
 * iwcap.c - A simply radiotap capture utility outputting pcap dumps
 *
 *    Copyright 2012 Jo-Philipp Wich <jo@mein.io>
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 *
 */

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <syslog.h>
#include <errno.h>
#include <byteswap.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <linux/if_packet.h>

#define ARPHRD_IEEE80211_RADIOTAP	803

#define DLT_IEEE802_11_RADIO		127
#define LEN_IEEE802_11_HDR			32

#define FRAMETYPE_MASK				0xFC
#define FRAMETYPE_BEACON			0x80
#define FRAMETYPE_DATA				0x08

#if __BYTE_ORDER == __BIG_ENDIAN
#define le16(x) __bswap_16(x)
#else
#define le16(x) (x)
#endif

uint8_t run_dump   = 0;
uint8_t run_stop   = 0;
uint8_t run_daemon = 0;

uint32_t frames_captured = 0;
uint32_t frames_filtered = 0;

int capture_sock = -1;
const char *ifname = NULL;


struct ringbuf {
	uint32_t len;            /* number of slots */
	uint32_t fill;           /* last used slot */
	uint32_t slen;           /* slot size */
	void *buf;               /* ring memory */
};

struct ringbuf_entry {
	uint32_t len;            /* used slot memory */
	uint32_t olen;           /* original data size */
	uint32_t sec;            /* epoch of slot creation */
	uint32_t usec;			 /* epoch microseconds */
};

typedef struct pcap_hdr_s {
	uint32_t magic_number;   /* magic number */
	uint16_t version_major;  /* major version number */
	uint16_t version_minor;  /* minor version number */
	int32_t  thiszone;       /* GMT to local correction */
	uint32_t sigfigs;        /* accuracy of timestamps */
	uint32_t snaplen;        /* max length of captured packets, in octets */
	uint32_t network;        /* data link type */
} pcap_hdr_t;

typedef struct pcaprec_hdr_s {
	uint32_t ts_sec;         /* timestamp seconds */
	uint32_t ts_usec;        /* timestamp microseconds */
	uint32_t incl_len;       /* number of octets of packet saved in file */
	uint32_t orig_len;       /* actual length of packet */
} pcaprec_hdr_t;

typedef struct ieee80211_radiotap_header {
	u_int8_t  it_version;    /* set to 0 */
	u_int8_t  it_pad;
	u_int16_t it_len;        /* entire length */
	u_int32_t it_present;    /* fields present */
} __attribute__((__packed__)) radiotap_hdr_t;


int check_type(void)
{
	struct ifreq ifr;

	strncpy(ifr.ifr_name, ifname, IFNAMSIZ);

	if (ioctl(capture_sock, SIOCGIFHWADDR, &ifr) < 0)
		return -1;

	return (ifr.ifr_hwaddr.sa_family == ARPHRD_IEEE80211_RADIOTAP);
}

int set_promisc(int on)
{
	struct ifreq ifr;

	strncpy(ifr.ifr_name, ifname, IFNAMSIZ);

	if (ioctl(capture_sock, SIOCGIFFLAGS, &ifr) < 0)
		return -1;

	if (on && !(ifr.ifr_flags & IFF_PROMISC))
	{
		ifr.ifr_flags |= IFF_PROMISC;

		if (ioctl(capture_sock, SIOCSIFFLAGS, &ifr))
			return -1;

		return 1;
	}
	else if (!on && (ifr.ifr_flags & IFF_PROMISC))
	{
		ifr.ifr_flags &= ~IFF_PROMISC;

		if (ioctl(capture_sock, SIOCSIFFLAGS, &ifr))
			return -1;

		return 1;
	}

	return 0;
}


void sig_dump(int sig)
{
	run_dump = 1;
}

void sig_teardown(int sig)
{
	run_stop = 1;
}


void write_pcap_header(FILE *o)
{
	pcap_hdr_t ghdr = {
		.magic_number  = 0xa1b2c3d4,
		.version_major = 2,
		.version_minor = 4,
		.thiszone      = 0,
		.sigfigs       = 0,
		.snaplen       = 0xFFFF,
		.network       = DLT_IEEE802_11_RADIO
	};

	fwrite(&ghdr, 1, sizeof(ghdr), o);
}

void write_pcap_frame(FILE *o, uint32_t *sec, uint32_t *usec,
					  uint16_t len, uint16_t olen)
{
	struct timeval tv;
	pcaprec_hdr_t fhdr;

	if (!sec || !usec)
	{
		gettimeofday(&tv, NULL);
	}
	else
	{
		tv.tv_sec  = *sec;
		tv.tv_usec = *usec;
	}

	fhdr.ts_sec   = tv.tv_sec;
	fhdr.ts_usec  = tv.tv_usec;
	fhdr.incl_len = len;
	fhdr.orig_len = olen;

	fwrite(&fhdr, 1, sizeof(fhdr), o);
}


struct ringbuf * ringbuf_init(uint32_t num_item, uint16_t len_item)
{
	static struct ringbuf r;

	if (len_item <= 0)
		return NULL;

	r.buf = malloc(num_item * (len_item + sizeof(struct ringbuf_entry)));

	if (r.buf)
	{
		r.len = num_item;
		r.fill = 0;
		r.slen = (len_item + sizeof(struct ringbuf_entry));

		memset(r.buf, 0, num_item * len_item);

		return &r;
	}

	return NULL;
}

struct ringbuf_entry * ringbuf_add(struct ringbuf *r)
{
	struct timeval t;
	struct ringbuf_entry *e;

	gettimeofday(&t, NULL);

	e = r->buf + (r->fill++ * r->slen);
	r->fill %= r->len;

	memset(e, 0, r->slen);

	e->sec = t.tv_sec;
	e->usec = t.tv_usec;

	return e;
}

struct ringbuf_entry * ringbuf_get(struct ringbuf *r, int i)
{
	struct ringbuf_entry *e = r->buf + (((r->fill + i) % r->len) * r->slen);

	if (e->len > 0)
		return e;

	return NULL;
}

void ringbuf_free(struct ringbuf *r)
{
	free(r->buf);
	memset(r, 0, sizeof(*r));
}


void msg(const char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);

	if (run_daemon)
		vsyslog(LOG_INFO | LOG_USER, fmt, ap);
	else
		vfprintf(stderr, fmt, ap);

	va_end(ap);
}


int main(int argc, char **argv)
{
	int i, n;
	struct ringbuf *ring;
	struct ringbuf_entry *e;
	struct sockaddr_ll local = {


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