From: Michael Tremer <michael.tremer@ipfire.org>
Date: Tue, 26 Aug 2014 17:51:53 +0000 (+0200)
Subject: Introduce "network device ap0 monitor" command
X-Git-Tag: 007~106
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5a38ea84a7e5122e9b38581c2413ad27b1bd9912;p=network.git

Introduce "network device ap0 monitor" command

This enables the user to monitor all 802.11 frames
that traverse the wireless interface.
---

diff --git a/src/functions/functions.wireless b/src/functions/functions.wireless
index f33419e3..9090056d 100644
--- a/src/functions/functions.wireless
+++ b/src/functions/functions.wireless
@@ -55,7 +55,7 @@ function wireless_create() {
 		shift
 	done
 
-	assert isoneof type ibss managed __ap
+	assert isoneof type ibss managed monitor __ap
 	assert phy_exists ${phy}
 	isset address || address=$(mac_generate)
 
@@ -182,6 +182,7 @@ function wireless_set_channel() {
 
 	device_exists ${device} || return ${EXIT_ERROR}
 
+	log DEBUG "Setting wireless channel on device '${device}' to channel '${channel}'"
 	cmd_quiet iw dev ${device} set channel ${channel}
 }
 
@@ -242,3 +243,35 @@ function wireless_is_radar_frequency() {
 
 	[[ ${frequency} -ge 5260 ]] && [[ ${frequency} -le 5700 ]]
 }
+
+function wireless_monitor() {
+	local device="${1}"
+	assert isset device
+	shift
+
+	local monitor_device="mon$$"
+
+	# Create an 802.11 monitoring device
+	wireless_create "${monitor_device}" --phy="${device}" --type="monitor"
+	local ret=$?
+
+	case "${ret}" in
+		0)
+			# Bring up the device
+			device_set_up "${monitor_device}"
+
+			# Starting tcpdump
+			tcpdump -i "${monitor_device}" "$@"
+
+			# Remove the monitoring interface.
+			wireless_remove "${monitor_device}"
+			;;
+
+		*)
+			log ERROR "Could not create a monitoring interface on ${device}"
+			return ${EXIT_ERROR}
+			;;
+	esac
+
+	return ${EXIT_OK}
+}
diff --git a/src/network b/src/network
index a0f393a9..0425d7af 100644
--- a/src/network
+++ b/src/network
@@ -73,6 +73,9 @@ function cli_device() {
 		discover)
 			cli_device_discover ${device} $@
 			;;
+		monitor)
+			cli_device_monitor "${device}" $@
+			;;
 		status)
 			cli_device_status ${device}
 			;;
@@ -421,6 +424,19 @@ function cli_device_send_ussd_command() {
 	exit $?
 }
 
+function cli_device_monitor() {
+	local device="${1}"
+	assert isset device
+
+	if ! device_is_wireless "${device}"; then
+		error "This action only works with wireless devices. Exiting."
+		exit ${EXIT_ERROR}
+	fi
+
+	wireless_monitor "${device}"
+	exit $?
+}
+
 function cli_hostname() {
 	if cli_help_requested $@; then
 		cli_show_man network