LibreNMS api workaround for https://github.com/librenms/librenms/issues/12607

get_vlans_by_librenms_port_url.sh

#!/bin/bash

# A crutch way to extract vlans from librenms, because currently (librenms 1.63)
# the api cannot provide all vlans, however the web interface can.
# See https://github.com/librenms/librenms/issues/12607

pw="123456"
user="someuser"

url_to_login="https://yourdomain.com/login"
cookie_file="/tmp/yourdomain.com_cookies.txt"

function update_login() {
	curl -k -s "$url_to_login" -b "$cookie_file" -c "$cookie_file" > /tmp/out_1.html # We need to get _token value from there
	form_token=$(cat /tmp/out_1.html | grep "_token" | cut -f6 -d '"')
	# echo "Extracted token: $form_token"
	curl -k -s "$url_to_login" -L -b "$cookie_file" -c "$cookie_file" --data "_token=${form_token}&username=${user}&password=${pw}" > /dev/null # &remember
}

function extract_vlans() {
	url="$1"
		
	curl -k -s -L -b "$cookie_file" -c "$cookie_file" "$url" > /tmp/out.html

	string=$(cat /tmp/out.html | grep -E "VLAN:|VLANs:")
	# echo "$string"

	if echo "$string" | grep "VLAN:" > /dev/null; then
	# 	echo single
		vlan_extracted=$(echo "$string" | sed 's/.*VLAN: \([0-9]*\)<.*/\1/' )
	elif echo "$string" | grep "VLANs:" > /dev/null; then
	# 	echo multiple
		vlan_extracted=$(echo "$string" | sed 's/.*title="\([0-9 ,]*\)".*/\1/')
	fi

	echo "$vlan_extracted"
}

if [[ "$1" == "-l" ]]; then
	update_login
else
	extract_vlans "$1"
fi