├── .gitignore ├── LICENSE ├── README.md ├── requirements.txt ├── run.sh └── update-udmpro-dns.py /.gitignore: -------------------------------------------------------------------------------- 1 | *.pyc 2 | dns-local.conf -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # UDM-DNS-Fix 2 | 3 | A simple script to provide basic DHCP hostname resolution in the latest UniFi Dream Machine Pro firmware. Borrows heavily from [github.com/wicol/unifi-dns](https://github.com/wicol/unifi-dns) for the core functionality to login to the Unifi UI and grab a list of these clients. 4 | 5 | ## How it works 6 | 7 | This script communicates with the UniFi API to grab a list of all hosts which have an alias set for them. It then builds a custom `dns-alias.conf` file, copies it to the UDM Pro (not the UniFi controller; there's a difference), then restarts the `dnsmasq` service. This provides a crude, but effective method of managing hostname based address resolution until UniFi gets around to implementing a proper DNS solution on the UDM Pro. Recent UniFi sw updates have forced the use of FQDN, so setting a Domain Name for each Network is recommended -- otherwise, the script will default to using `.home.arpa`, per [IETF RFC8375](https://datatracker.ietf.org/doc/html/rfc8375). Unqualified hostnames are inserted in the event that UniFi rolls back this requirement. 8 | 9 | ## How to Use This Script 10 | 11 | ### Install Requirements 12 | 13 | This script is designed to be ran on a host within your network (not the UDM Pro). It is written in Python 3 and requires external dependencies, which can be installed by running `pip3 install -r requirements.txt`. I recommend setting this command up to run as a cron job to ensure newly created entreis are added to `dnsmasq` regularly. 14 | 15 | ### Command Line Arguments 16 | 17 | - `-b`: This is the URL you use to log into your local UniFi UI 18 | - `-p`: This is the password you use to log into your local UniFi UI 19 | - `-u`: This is the username you use to log into your local UniFi UI 20 | - `-N`: Use ~/.netrc entry for api host, username, and password (example `https://unifi.lan:443`) 21 | - `-su`: This is the username you use to SSH into your UDM Pro directly 22 | - `-sp`: This is the password you use to SSH into your UDM Pro directly 23 | - `-sa`: This is the address you use to SSH into your UDM Pro directly 24 | - `-S`: Use ~/.netrc entry for ssh host, username, and password (example `unifi`) 25 | - `-f`: This is a flag which tells the script to only add entries which include a fixed IP address to the `/etc/hosts` file 26 | - `-v`: This is a flag which enables verbose output from the script as it runs. Can be specified multiple times for additional levels of verbosity 27 | 28 | ### Example Commands 29 | 30 | #### Bash Command 31 | 32 | ``` bash 33 | ./update-udmpro-dns.py -b https://192.168.1.1:443 -p -u -su root -sp -sa 192.168.1.1 -f -vvv 34 | ``` 35 | 36 | #### Using `~/.netrc` entries 37 | 38 | ``` bash 39 | $ cat ~/.netrc 40 | machine unifi login root account root password ROOTPASSWORD 41 | machine https://unifi.lan:443 login USERNAME account USERNAME password USERPASSWORD 42 | 43 | $ ./update-udmpro-dns.py -N https://unifi.lan:443 -S unifi --verbose 44 | ``` 45 | 46 | #### Bash Script 47 | 48 | Customize line 10 of the `run.sh` file to suit your needs, then simply run: 49 | 50 | ``` bash 51 | ./run.sh 52 | ``` 53 | 54 | More information can be found by running `./update-udmpro-dns.py -h` 55 | 56 | ## How to enable SSH on the UDM Pro (Not the UniFi Controller) 57 | 58 | So you can probably figure out the base url stuff pretty easy, but figuring out how to enable SSH on the actual UDM Pro was a bit of a pain, since it's not directly in the UniFi UI I'm used to. To get there, do this: 59 | 60 | - Open a browser and go to `https://` 61 | - Sign in with your Unifi credentials (same as you use for the hosted portal) 62 | - Choose "Settings" at the bottom of the page, so you're taken to the UDMPro overview 63 | - Select "Advanced" from the left menu pane 64 | - Toggle "SSH" to be on 65 | - Use "Change Password" to set the password you want 66 | - SSH in to the UDMP's IP with the username "root" and the password you just set in order to verify everything is working. 67 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | requests 2 | scp 3 | paramiko -------------------------------------------------------------------------------- /run.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | script_dir="$( dirname -- "$BASH_SOURCE"; )"; 4 | venv_dir="$(mktemp -d)" 5 | 6 | python3 -m venv ${venv_dir} --system-site-packages 7 | source ${venv_dir}/bin/activate 8 | pip3 install -q -r ${script_dir}/requirements.txt 9 | 10 | python3 ${script_dir}/update-udmpro-dns.py -N https://unifi.lan:443 -S unifi --verbose 11 | 12 | deactivate 13 | rm -rf ${venv_dir} 14 | -------------------------------------------------------------------------------- /update-udmpro-dns.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python3 2 | """ 3 | Custom DNSMasq configuration for Unifi UDMPro to overcome shortcomings. 4 | - Fetches configured and dynamic clients and gives them proper DNS names for their networks. 5 | - Merges with custom local DNSMasq configuration file for CNAMEs and other options. 6 | 7 | Example (using ~/.netrc file): 8 | $ ./get_unifi_reservations.py -N https://unifi.lan:443 -S unifi --verbose 9 | """ 10 | 11 | import os 12 | import re 13 | import sys 14 | import netrc 15 | import tempfile 16 | import urllib3 17 | from argparse import ArgumentParser 18 | 19 | # External modules 20 | import requests 21 | import paramiko 22 | from scp import SCPClient 23 | 24 | # Disable Insecure Request Warnings 25 | urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning) 26 | 27 | def get_configured_clients(session: requests.Session, baseurl: str, site: str): 28 | """Get configured clients from UDMPro""" 29 | 30 | r = session.get(f'{baseurl}/proxy/network/api/s/{site}/list/user', verify=False) 31 | r.raise_for_status() 32 | return r.json()['data'] 33 | # End def 34 | 35 | def get_active_clients(session: requests.Session, baseurl: str, site: str): 36 | """Get active clients from UDMPro""" 37 | 38 | r = session.get(f'{baseurl}/proxy/network/api/s/{site}/stat/sta', verify=False) 39 | r.raise_for_status() 40 | return r.json()['data'] 41 | # End def 42 | 43 | def get_configured_networks(session: requests.Session, baseurl: str, site: str): 44 | """Get configured networks from UDMPro""" 45 | 46 | r = session.get(f'{baseurl}/proxy/network/api/s/{site}/rest/networkconf', verify=False) 47 | r.raise_for_status() 48 | return r.json()['data'] 49 | # End def 50 | 51 | def build_fqdn(client: dict, networks: dict): 52 | """Return fully qualified domain name for client on network""" 53 | 54 | if client['network_id'] in networks: 55 | return f"{client['name']}.{networks[client['network_id']]}" 56 | # End if 57 | 58 | # default to .home.arpa, per IETF RFC8375 59 | return f"{client['name']}.home.arpa" 60 | # End def 61 | 62 | def get_clients(baseurl: str, username: str, password: str, site: str, fixed_only: bool, verbose: int): 63 | """Get clients and networks from UDMPro""" 64 | 65 | if verbose>2: print('Creating API session...') 66 | s = requests.Session() 67 | 68 | # Log in to controller 69 | if verbose>2: print('Logging into the controller...') 70 | r = s.post(f'{baseurl}/api/auth/login', json={'username': username, 'password': password}, verify=False) 71 | r.raise_for_status() 72 | if verbose>2: print('Login successful!') 73 | 74 | # Get networks... 75 | networks = {} 76 | for n in get_configured_networks(s, baseurl, site): 77 | if 'domain_name' in n: 78 | networks[n['_id']] = n['domain_name'] 79 | # End if 80 | # End for 81 | 82 | # Add clients with alias and reserved IP 83 | clients = {} 84 | if verbose>2: print('Getting a list of clients and IPs...') 85 | for c in get_configured_clients(s, baseurl, site): 86 | if 'name' in c and 'fixed_ip' in c: 87 | c['name'] = c['name'].lower() 88 | fqdn = build_fqdn(c, networks) 89 | clients[c['mac']] = {'name': c['name'], 'fqdn': fqdn, 'ip': c['fixed_ip']} 90 | # End if 91 | # End for 92 | 93 | if not fixed_only: 94 | # Add active clients with alias 95 | # Active client IP overrides the reserved one (the actual IP is what matters most) 96 | for c in get_active_clients(s, baseurl, site): 97 | if 'name' in c and 'ip' in c: 98 | c['name'] = c['name'].lower() 99 | fqdn = build_fqdn(c, networks) 100 | clients[c['mac']] = {'name': c['name'], 'fqdn': fqdn, 'ip': c['ip']} 101 | # End if 102 | # End for 103 | # End if 104 | 105 | # Return a list of clients filtered on dns-friendly names and sorted by IP 106 | friendly_clients = [c for c in clients.values() if re.search('^[a-zA-Z0-9-]+$', c['name'])] 107 | if verbose>2: print('Client list obtained successfully!') 108 | return sorted(friendly_clients, key=lambda i: i['name']) 109 | # End def 110 | 111 | def merge_dnsmasq_conf(hosts: list, custom_path:str, localpath: str, verbose: int): 112 | """Merge discovered clients with custom options file into temp file to upload""" 113 | 114 | with open(localpath, 'w') as outfile: 115 | # discovered clients 116 | for ip, name, fqdn in hosts: 117 | outfile.write(f'host-record={fqdn},{name},{ip}\n') 118 | # End for 119 | 120 | # local custom options 121 | if os.stat(custom_path).st_size > 0: 122 | if verbose>2: print('Adding custom options to the file...') 123 | with open(custom_path, 'r') as localfile: 124 | for line in localfile: 125 | outfile.write(line) 126 | # End for 127 | # End with 128 | # End with 129 | # End def 130 | 131 | def scp_dnsmasq(localpath: str, ssh_username: str, ssh_password: str, ssh_address: str, verbose: int): 132 | """Copy merged temp file to UDMPro and restart DNSMasq""" 133 | 134 | # Where the UDMPro is looking for DNSMasq files. 135 | filepath = '/run/dnsmasq.conf.d/dns-alias.conf' 136 | 137 | if verbose>2: print('Creating an SSH session...') 138 | ssh_client = paramiko.SSHClient() 139 | ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy()) 140 | ssh_client.connect(hostname=ssh_address,username=ssh_username,password=ssh_password) 141 | if verbose>2: print('SSH Session created successfully!') 142 | 143 | # Push dns-alias.conf file 144 | if verbose>2: print('Pushing new dns-alias.conf file...') 145 | with SCPClient(ssh_client.get_transport()) as scp: 146 | scp.put(localpath, filepath) 147 | # End with 148 | 149 | # Restart dnsmasq on the UDM Pro 150 | if verbose>2: print('Restarting dnsmasq service...') 151 | ssh_client.exec_command("""killall dnsmasq""") 152 | #ssh_client.exec_command("""kill `cat /run/dnsmasq.pid`""") 153 | # End def 154 | 155 | 156 | def main(): 157 | parser = ArgumentParser() 158 | parser.add_argument('-b', '--baseurl', type=str, default="https://192.168.1.1:443", help='The site\'s base URL. Defaults to: "https://192.168.1.1:443"') 159 | parser.add_argument('-u', '--username', type=str, default="root", help='Your user\'s username. Defaults to: "root"') 160 | parser.add_argument('-p', '--password', type=str, default="ubnt", help='Your user\'s password. Defaults to: "ubnt"') 161 | 162 | parser.add_argument('-s', '--site', type=str, default="default", help='The name of your unifi site. Defaults to: "default"') 163 | 164 | parser.add_argument('-su', '--ssh_username', type=str, default="root", help='Your UDM\'s SSH username. Defaults to: "root"') 165 | parser.add_argument('-sp', '--ssh_password', type=str, default="ubnt", help='Your UDM\'s SSH password. Defaults to: "ubnt"') 166 | parser.add_argument('-sa', '--ssh_address', type=str, default="192.168.1.1", help='Your UDM\'s SSH address. Defaults to: "192.168.1.1"') 167 | 168 | parser.add_argument('-f', '--fixed_only', action='store_true', help='Only add entries with a fixed DNS name configured.') 169 | parser.add_argument('-v', '--verbose', action='count', default=0, help='Enable verbose output. May be specified multiple times for increased verbosity.') 170 | 171 | parser.add_argument('-N', '--netrc', type=str, default=None, help='Use ~/.netrc entry for api host') 172 | parser.add_argument('-S', '--ssh', type=str, default=None, help='Use ~/.netrc entry for ssh host') 173 | args = parser.parse_args() 174 | 175 | if args.netrc: 176 | passes = netrc.netrc() 177 | if args.netrc not in passes.hosts: 178 | print(f'Unifi API host "{args.netrc}" not in netrc file!') 179 | exit(1) 180 | # End if 181 | 182 | (login, account, password) = passes.authenticators(args.netrc) 183 | args.baseurl = args.netrc 184 | args.username = login 185 | args.password = password 186 | # End if 187 | 188 | if args.ssh: 189 | if args.ssh not in passes.hosts: 190 | print(f'SSH host "{args.ssh}" not in netrc file!') 191 | exit(1) 192 | # End if 193 | 194 | passes = netrc.netrc() 195 | (login, _, password) = passes.authenticators(args.ssh) 196 | args.ssh_address = args.ssh 197 | args.ssh_username = login 198 | args.ssh_password = password 199 | # End if 200 | 201 | # Get list of hosts and IPs 202 | try: 203 | if args.verbose: print('Getting host information...') 204 | 205 | hosts = [] 206 | for c in get_clients(args.baseurl, args.username, args.password, args.site, args.fixed_only, args.verbose): 207 | if args.verbose>2: print(f"Found host - IP: {c['ip']}\tName: {c['name']}\tFQDN:{c['fqdn']}") 208 | hosts.append((c['ip'], c['name'], c['fqdn'])) 209 | # End for 210 | 211 | except requests.exceptions.ConnectionError: 212 | print(f'Could not connect to unifi controller at {args.baseurl}', file=sys.stderr) 213 | exit(1) 214 | # End try/except block 215 | 216 | if args.verbose: 217 | if hosts: 218 | print('Found the following hosts:') 219 | for host in hosts: 220 | domainname = host[2][len(host[1])+1:] 221 | print(f'\t{host[0]:15} {host[1]} ({domainname})') 222 | # End for 223 | else: 224 | print('No hosts found!') 225 | # End if/else block 226 | # End if 227 | 228 | # SCP list onto target UDM Pro 229 | (fp, tempfn) = tempfile.mkstemp() 230 | merge_dnsmasq_conf(hosts, 'dns-local.conf', tempfn, args.verbose) 231 | scp_dnsmasq(tempfn, args.ssh_username, args.ssh_password, args.ssh_address, args.verbose) 232 | 233 | # Clean up local file 234 | if args.verbose>2: print('Cleaning up local files...') 235 | os.remove(tempfn) 236 | # End def 237 | 238 | if __name__ == '__main__': 239 | main() 240 | # End if --------------------------------------------------------------------------------