#!/bin/sh

#EAP DFS Event recovery script
#
#
#    * change http to https in curl lines if enabled
#
#Formatting for freebsd, linux/bash may require minor formatting changes
#    * "-ne" in comparison check instead of "=="
#
#
#20250101 updates https after eap fw updates


#for reference, 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 - obtained from browser developer tools}"

#5ghz channel number
DESIRED_CHANNEL="100"
#5ghz channel id
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=$(curl -k -Ss "https://$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: https://$EAP_HOST/" -H "Cookie: JSESSIONID=$SESSION_ID" | grep "channel" | awk '{print $2}' | cut -c 2-4 )

CURRENT_CHANNEL=$(curl -k -Ss "http:/$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 $EAP_HOST, USERNAME $USERNAME, PASSWORD $PASSWORD, SESSION_ID $SESSION_ID, CURRENT_CHANNEL $CURRENT_CHANNEL, DESIRED_CHANNEL $DESIRED_CHANNEL

if [ $CURRENT_CHANNEL != $DESIRED_CHANNEL ]
  then

        logger -s -t "dfs" "$EAP_HOST DFS event occurred, current channel $CURRENT_CHANNEL"  >/dev/null 2>&1

        curl -k -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=$(curl -k -Ss "http:/$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 back to $CURRENT_CHANNEL_NEW" >/dev/null 2>&1
        echo Channel reset back to $CURRENT_CHANNEL_NEW from $CURRENT_CHANNEL | /usr/local/bin/mail.php  -s"DFS Event"

fi