pydhcpdparser

pydhcpdparser is a pure python based, DHCPD configuration parser. Built using ply, lex and yacc parsing tool, pydhcpdparser can be used to verify syntax of DHCPD configurations, parse and extract values from configuration files and access them as python variables.

Examples

If you input DHCPD configuration to pydhcpdparser as

subnet 10.198.146.0 netmask 255.255.255.192 {
    pool {
         failover peer "az-dhcp-failover";
         range 10.198.146.4 10.198.146.62;
    }
    option routers 10.198.146.1;
    option broadcast-address 10.198.146.63;
    option domain-name "some.domain.net";
    option domain-name-servers 10.24.199.136,10.24.199.137;
}

pydhcpdparser verifies DHCPD syntax, parse and return back pythonic result as

[{'netmask': '255.255.255.192',
 'option': {'broadcast-address': '10.198.146.63',
            'domain-name': '"some.domain.net"',
            'domain-name-servers': '10.24.199.136,10.24.199.137',
            'routers': '10.198.146.1'},
 'pool': {'failover': ('peer', '"az-dhcp-failover"'),
          'range': ('10.198.146.4', '10.198.146.62')},
 'subnet': '10.198.146.0'}]

Usage

import pydhcpdparser

conf = """
subnet 10.198.146.0 netmask 255.255.255.192 {
    pool {
         failover peer "az-dhcp-failover";
         range 10.198.146.4 10.198.146.62;
    }
    option routers 10.198.146.1;
    option broadcast-address 10.198.146.63;
    option domain-name "some.domain.net";
    option domain-name-servers 10.24.199.136,10.24.199.137;
}
"""
print(pydhcpdparser.parser.parse(conf))

OR

from pydhcpdparser import parser

conf = "zone 17.127.10.in-addr.arpa. { key DHCPUPDATE; }"
print(parser.parse(conf))

OR

from pydhcpdparser import *

with open("/etc/dhcp/dhcpd.conf") as f:
    conf = f.read()
print(parser.parse(conf))

Installing pydhcpdparser

$ pip install pydhcpdparser

Development installation pydhcpdparser

$ pip install pydhcpdparser -r test-requirements.txt

Supported configuration parser

1. Subnet statements

   subnet subnet-number netmask netmask {
     [ parameters ]
     [ declarations ]
   }

2. pool declaration

3. range statement :

   range [ dynamic-bootp ] low-address [ high-address];

4. Option statements :

   option name value1[, value2...];

5. Zone declaration

6. Key declaration :

   key name {
       algorithm algo;
       secret value;
   };

7. Include statement :

   include "filename";

8. Allow and Deny declarations within pool declarations :

   known-clients;
   unknown-clients;
   dynamic bootp clients;
   authenticated clients;
   unauthenticated clients;
   all clients;
   after time;
   members of "class";

9. Allow, Deny and Ignore declarations at global scope :

   unknown-clients
   bootp
   duplicates
   client-updates
   leasequery
   booting
   declines

10. Global parameters declaration statement

adandon-lease-time time;
adaptive-lease-time-threshold percentage;
always-broadcast flag;
always-reply-rfc1048 flag;
authoritative;
not authoritative;
boot-unknown-clients flag;
db-time-format [ default | local ] ;
ddns-domainname name;
ddns-rev-domainname name;
ddns-update-style style;
ddns-updates flag;
default-lease-time time;
delayed-ack count;
max-ack-delay microseconds;
do-forward-updates flag;
dynamic-bootp-lease-cutoff date;
dynamic-bootp-lease-length length;
filename "filename";
get-lease-hostnames flag;
infinite-is-reserved flag;
lease-file-name name;
limit-addrs-per-ia number;
dhcpv6-lease-file-name name;
local-port port;
local-address address;
log-facility facility;
max-lease-time time;
min-lease-time time;
min-secs seconds;
next-server server-name;
omapi-port port;
one-lease-per-client flag;
pid-file-name name;
dhcpv6-pid-file-name name;
ping-check flag;
ping-timeout seconds;
preferred-lifetime seconds;
remote-port port;
server-identifier hostname;
server-duid LLT [ hardware-type timestamp hardware-address ] ;
server-duid EN enterprise-number enterprise-identifier ;
server-duid LL [ hardware-type hardware-address ] ;
server-name name ;
dhcpv6-set-tee-times flag;
site-option-space name ;
stash-agent-options flag;
update-conflict-detection flag;
update-optimization flag;
update-static-leases flag;
use-host-decl-names flag;
use-lease-addr-for-default-route flag;
vendor-option-space string;
option name value1[, value2...];

11. Host block declaration statements

always-reply-rfc1048 flag;
ddns-hostname name;
ddns-domainname name;
fixed-address address [, address ... ];
fixed-address6 ip6-address ;
fixed-prefix6 low-address / bits;
hardware hardware-type hardware-address;

Unit testing

$ python -m unittest discover

$ python3 -m unittest

Development external references

https://kb.isc.org/docs