hostap/wlantest/monitor.c
Jouni Malinen a149fcc77d wlantest: Add preliminary version of IEEE 802.11 protocol testing tool
This tool can be used to capture IEEE 802.11 frames either from a
monitor interface for realtime capturing or from pcap files for
offline analysis. This version is only adding basic infrastructure for
going through the frames and parsing their headers.
2010-11-07 23:29:00 +02:00

87 lines
1.9 KiB
C

/*
* Linux packet socket monitor
* Copyright (c) 2010, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "utils/includes.h"
#include <net/if.h>
#include <netpacket/packet.h>
#include "utils/common.h"
#include "utils/eloop.h"
#include "wlantest.h"
static void monitor_read(int sock, void *eloop_ctx, void *sock_ctx)
{
struct wlantest *wt = eloop_ctx;
u8 buf[3000];
int len;
len = recv(sock, buf, sizeof(buf), 0);
if (len < 0) {
wpa_printf(MSG_INFO, "recv(PACKET): %s", strerror(errno));
return;
}
wlantest_process(wt, buf, len);
}
int monitor_init(struct wlantest *wt, const char *ifname)
{
struct sockaddr_ll ll;
os_memset(&ll, 0, sizeof(ll));
ll.sll_family = AF_PACKET;
ll.sll_ifindex = if_nametoindex(ifname);
if (ll.sll_ifindex == 0) {
wpa_printf(MSG_ERROR, "Monitor interface '%s' does not exist",
ifname);
return -1;
}
wt->monitor_sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (wt->monitor_sock < 0) {
wpa_printf(MSG_ERROR, "socket(PF_PACKET,SOCK_RAW): %s",
strerror(errno));
return -1;
}
if (bind(wt->monitor_sock, (struct sockaddr *) &ll, sizeof(ll)) < 0) {
wpa_printf(MSG_ERROR, "bind(PACKET): %s", strerror(errno));
close(wt->monitor_sock);
wt->monitor_sock = -1;
return -1;
}
if (eloop_register_read_sock(wt->monitor_sock, monitor_read, wt, NULL))
{
wpa_printf(MSG_ERROR, "Could not register monitor read "
"socket");
close(wt->monitor_sock);
wt->monitor_sock = -1;
return -1;
}
return 0;
}
void monitor_deinit(struct wlantest *wt)
{
if (wt->monitor_sock >= 0) {
eloop_unregister_read_sock(wt->monitor_sock);
close(wt->monitor_sock);
wt->monitor_sock = -1;
}
}