Scrape PFSense DHCP Leases Status Page and Export Results to JSON

scrape_pfsense_dhcp_leases.py

#!/usr/bin/env python3

# # This python script provides a function to query the pfsense (+v2.4) dhcp leases status page and return a list of tuples including 
# ip, hostname, and mac address. To use, ensure LXML is installed via package manager or via pip.
#
# 16-Dec-2016 - Original release
# 3-Sep-2020  - Minor update to match formatting of leases page in latest pfSense version (2.4.5).
# 9-Sep-2020  - Backported improvements to handle table rows with missing data, use global variables for user/pass/server_ip, 
#               and return list from scrape function as implemented by fryguy04 in fork here:
#                   https://gist.github.com/fryguy04/7d12b789260c47c571f42e5bc733a813
# 9-Sep-2020  - Added parsing of pfSense lease table header.  Discovered that adding element of ClientID in the static dhcp 
#               definitions alters the column sequence.  This modification ensures that the correct columns are found and parsed.
# 9-Sep-2020  - Removed file export function    
#


import sys
import requests
from lxml import html
import re

url  = "http://192.168.1.1/status_dhcp_leases.php" #change url to match your pfsense machine address. Note http or https!
user = 'your_username'  #Username for pfSense login
password = 'your_password' #Password for pfSense login

def scrape_pfsense_dhcp(url, user, password):
    ip = []
    mac = []
    dhcp_name = []

    s = requests.session()
    r = s.get(url,verify = False)

    matchme = 'csrfMagicToken = "(.*)";var'
    csrf = re.search(matchme,str(r.text))

    payload = {
'__csrf_magic' : csrf.group(1),
'login' : 'Login',
'usernamefld' : user,
'passwordfld' : password
}
    r = s.post(url,data=payload,verify = False)
    r = s.get(url,verify = False)
    tree = html.fromstring(r.content)

    tr_elements = tree.xpath('//tr')
    headers = [header.text for header in tr_elements[0]]
    
    ip.extend(tree.xpath('//body[1]//div[1]//div[2]//div[2]//table[1]//tbody//tr//td[' + str(headers.index('IP address') + 1) +']//text()'))
    mac.extend(tree.xpath('//body[1]//div[1]//div[2]//div[2]//table[1]//tbody//tr//td['+ str(headers.index('MAC address') + 1) +']//text()'))
    
    for node in tree.xpath('//body[1]//div[1]//div[2]//div[2]//table[1]//tbody//tr//td['+ str(headers.index('Hostname') + 1) +']'):
        if node.text is None:
              dhcp_name.append('no_hostname')
        else:
              dhcp_name.append(node.text)
    for i in range(len(mac)):
          mac[i] = mac[i].strip()
    return(list(zip(ip, mac, dhcp_name)))

if __name__ == "__main__":     
    dhcp_list = scrape_pfsense_dhcp(url, user, password)

    for entry in dhcp_list:
            print(entry)

FYI for anyone using this ... I created a cleaned up version that puts the data into a Struct and accounts for lines missing information (like IP) ... that way you get a clean (IP, MAC, Hostname) ... Above code creates 3 separate lists but unfortunately data won't line up if you have any missing data (which is highly likely if a machine connected, got a DHCP IP then disconnected). Shout out to orig author for doing all the hard work ...
https://gist.github.com/fryguy04/7d12b789260c47c571f42e5bc733a813

Also of note below Library ... overkill for what i needed (only DHCP) but might be helpful for others
https://github.com/ndejong/pfsense_fauxapi

Hi Great work. I just don't get how you obtain __csrf_magic values.

@fryguy04 I extended your version, to allow passing env vars for the authentication/url. I also changed from using xpath to other methods from lxml: get_item_from_id, iterchildren, itersiblings

https://gist.github.com/clayrosenthal/9c22108eaa18e1a079144738e3c7737c