#!/bin/sh

#5Ghz Channel numbers
<<comment
0  auto
1  36
2  40
3  44
4  48
5  52
6  56
7  60
8  64
9  100
10 104
11 108
12 112
13 116
14 120
15 124
16 128
17 132
18 136
19 140
20 149
21 153
22 157
23 161
24 165
comment



EAP_HOST="eap670.local.domain"
USERNAME="admin"
PASSWORD="PASSWORD HASH"
DESIRED_CHANNEL="100"
DESIRED_CHANNEL_ID="9"

WIRELESS_MODE=16
CHANNEL_WIDTH=7
CHANNELLIMIT=0
TXPOWER=28
IS_APMODE=1
RADIOID=1

#Obtain session ID cookie
SESSION_ID=$(curl -Ss "http://$EAP_HOST/" -X POST --data-raw 'username='$USERNAME'&password='$PASSWORD'' --cookie-jar - | grep "SESSION" | cut -f 7)

#Read current channel
#CURRENT_CHANNEL=$(curl -sS "http:/$EAP_HOST/data/status.wireless.radio.json?operation=read&radioID=1" -H "Referer: http://$EAP_HOST/" -H "Cookie: JSESSIONID=$SESSION_ID" | grep "channel" | awk '{print $2}' | cut -c 2-4 )

CURRENT_CHANNEL=$(curl -sS "http:/$EAP_HOST/data/status.wireless.radio.json?operation=read&radioID=1" -H 'Referer: http://'$EAP_HOST'/' -H 'Cookie: JSESSIONID='$SESSION_ID'' | grep "channel" | awk '{print $2}' | cut -c 2-4 )

#for debugging, normally disabled
#echo $EAP_HOST $USERNAME $PASSWORD $SESSION_ID $CURRENT_CHANNEL

if [ $CURRENT_CHANNEL == $DESIRED_CHANNEL ]
  then
#echo 123
        logger -s -t "dfs" "$EAP_HOST DFS event occurred, check log; current channel $CURRENT_CHANNEL"

echo    curl -Ss "http://$EAP_HOST/data/wireless.basic.json" -X POST -H "Referer: http://$EAP_HOST/" -H "Cookie: JSESSIONID=$SESSION_ID" --data-raw "operation=write&wireless_mode=$WIRELESS_MODE&chan_width=$CHANNEL_WIDTH&channelLimit=$CHANNELLIMIT&channel=$DESIRED_CHANNEL_ID&txpower=$TXPOWER&is_apmode=$IS_APMODE&radioID=$RADIOID"
#-o /dev/null

        CURRENT_CHANNEL_NEW=$(curl -sS "http:/$EAP_HOST/data/status.wireless.radio.json?operation=read&radioID=1" -H 'Referer: http://'$EAP_HOST'/' -H 'Cookie: JSESSIONID='$SESSION_ID'' |  grep "channel" | awk '{print $2}' | cut -c 2-4 )

        logger -s -t "dfs" "$EAP_HOST Channel set to back to channel $CURRENT_CHANNEL_NEW."
  else
          exit
fi