overture

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Published: Mar 8, 2020 License: MIT

README

overture

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Overture is a DNS server/forwarder/dispatcher written in Go.

Overture means an orchestral piece at the beginning of a classical music composition, just like DNS which is nearly the first step of surfing the Internet.

Please note:

  • Read the entire README document is necessary if you want to use overture safe and sound.
  • Production usage is not recommended and there is no guarantee or warranty of it.
  • If you are using the binary releases, please follow the instructions in the README file with corresponding git version tag. The README in master branch are subject to change and does not always reflect the correct instructions to your binary release version.

Features

  • Full IPv6 support
  • Multiple DNS upstream
    • Via UDP/TCP with custom port
    • Via SOCKS5 proxy (TCP only)
    • With EDNS Client Subnet (ECS) RFC7871
  • Dispatcher
    • IPv6 record (AAAA) redirection
    • Custom domain
    • Custom IP network
  • Minimum TTL modification
  • Hosts (Both IPv4 and IPv6 is supported. IPs will be returned in random order, if you want to use regex match, please understand regex first)
  • Cache with ECS
Dispatch process

Overture can force custom domain DNS queries to use selected DNS when applicable.

For custom IP network, overture will query the domain with primary DNS firstly. If the answer is empty or the IP is not matched then overture will finally use the alternative DNS servers.

Installation

You can download binary releases from the release.

For ArchLinux users, package overture is available in AUR. If you use a AUR helper i.e. yaourt, you can simply run:

yaourt -S overture

Usages

Start with the default config file -> ./config.json

$ ./overture

Or use your own config file:

$ ./overture -c /path/to/config.json

Verbose mode:

$ ./overture -v

Log to file:

$ ./overture -l /path/to/overture.log

For other options, please see help:

$ ./overture -h

Tips:

  • Root privilege is required if you are listening on port 53.
  • For Windows users, you can run overture on command prompt instead of double click.
Configuration Syntax

Configuration file is "config.json" by default:

{
  "BindAddress": ":53",
  "DebugHTTPAddress": "127.0.0.1:5555",
  "PrimaryDNS": [
    {
      "Name": "DNSPod",
      "Address": "119.29.29.29:53",
      "Protocol": "udp",
      "SOCKS5Address": "",
      "Timeout": 6,
      "EDNSClientSubnet": {
        "Policy": "disable",
        "ExternalIP": "",
        "NoCookie": true
      }
    }
  ],
  "AlternativeDNS": [
    {
      "Name": "114DNS",
      "Address": "114.114.114.114:53",
      "Protocol": "udp",
      "SOCKS5Address": "",
      "Timeout": 6,
      "EDNSClientSubnet": {
        "Policy": "disable",
        "ExternalIP": "",
        "NoCookie": true
      }
    }
  ],
  "OnlyPrimaryDNS": false,
  "IPv6UseAlternativeDNS": false,
  "AlternativeDNSConcurrent": false,
  "WhenPrimaryDNSAnswerNoneUse": "PrimaryDNS",
  "IPNetworkFile": {
    "Primary": "./ip_network_primary_sample",
    "Alternative": "./ip_network_alternative_sample"
  },
  "DomainFile": {
    "Primary": "./domain_primary_sample",
    "Alternative": "./domain_alternative_sample",
    "Matcher":  "full-map"
  },
  "HostsFile": {
    "HostsFile": "./hosts_sample",
    "Finder": "full-map"
  },
  "MinimumTTL": 0,
  "DomainTTLFile" : "./domain_ttl_sample",
  "CacheSize" : 0,
  "RejectQType": [255]
}

Tips:

  • BindAddress: Specifying only port (e.g. :53) will have overture listen on all available addresses (both IPv4 and IPv6). Overture will handle both TCP and UDP requests. Literal IPv6 addresses are enclosed in square brackets (e.g. [2001:4860:4860::8888]:53)

  • DebugHTTPAddress: Specifying an HTTP port for debugging (5555 is the default port but it is also acknowledged as the android wifi adb listener port), currently used to dump DNS cache, and the request url is /cache, available query argument is nobody(boolean)

    • true(default): only get the cache size;

      $ curl 127.0.0.1:5555/cache | jq
      {
        "length": 1,
        "capacity": 100,
        "body": {}
      }
      
    • false: get cache size along with cache detail.

      $ curl 127.0.0.1:5555/cache?nobody=false | jq
      {
        "length": 1,
        "capacity": 100,
        "body": {
          "www.baidu.com. 1": [
            {
              "name": "www.baidu.com.",
              "ttl": 1140,
              "type": "CNAME",
              "rdata": "www.a.shifen.com."
            },
            {
              "name": "www.a.shifen.com.",
              "ttl": 300,
              "type": "CNAME",
              "rdata": "www.wshifen.com."
            },
            {
              "name": "www.wshifen.com.",
              "ttl": 300,
              "type": "A",
              "rdata": "104.193.88.123"
            },
            {
              "name": "www.wshifen.com.",
              "ttl": 300,
              "type": "A",
              "rdata": "104.193.88.77"
            }
          ]
        }
      }
      
  • DNS: You can specify multiple DNS upstream servers here.

    • Name: This field is only used for logging.
    • Address: Same as BindAddress.
    • Protocol: tcp, udp, tcp-tls or https
    • SOCKS5Address: Forward dns query to this SOCKS5 proxy, “” to disable.
    • EDNSClientSubnet: Used to improve DNS accuracy. Please check RFC7871 for details.
      • Policy
        • auto: If client IP is not in the reserved IP network, use client IP. Otherwise, use external IP.
        • manual: Use external IP if this field is not empty, otherwise use client IP if it is not reserved IP.
        • disable: Disable this feature.
      • ExternalIP: If this field is empty, ECS will be disabled when the inbound IP is not an external IP.
      • NoCookie: Disable cookie.
  • OnlyPrimaryDNS: Disable dispatcher feature, use primary DNS only.

  • IPv6UseAlternativeDNS: Redirect IPv6 DNS queries to alternative DNS servers.

  • AlternativeDNSConcurrent: Query the PrimaryDNS and AlternativeDNS at the same time

  • WhenPrimaryDNSAnswerNoneUse: If the response of PrimaryDNS exists and there is no ANSWER SECTION in it, the final DNS should be defined. (There is no AAAA record for most domains right now)

  • File: Absolute path like /path/to/file is allowed. For Windows users, please use properly escaped path like C:\\path\\to\\file.txt in the configuration.

  • DomainFile.Matcher: Matching policy and implementation, including "full-list", "full-map", "regex-list", "mix-list", "suffix-tree" and "final". Default value is "full-map".

  • HostsFile.Finder: Finder policy and implementation, including "full-map", "regex-list". Default value is "full-map".

  • DomainTTLFile: Regex match only for now;

  • MinimumTTL: Set the minimum TTL value (in seconds) in order to improve caching efficiency, use 0 to disable.

  • CacheSize: The number of query record to cache, use 0 to disable.

  • RejectQType: Reject inbound query with specific DNS record types, check List of DNS record types for details.

Domain file example (full match)
example.com
Domain file example (regex match)
^xxx.xx
IP network file example (CIDR match)
1.0.1.0/24
::1/128
Domain TTL file example (regex match)
 example.com$ 100
Hosts file example (full match)
127.0.0.1 localhost
::1 localhost
Hosts file example (regex match)
10.8.0.1 example.com$
DNS servers with ECS support
  • DNSPod 119.29.29.29:53

For DNSPod, ECS only works via udp, you can test it by patched dig

You can compare the response IP with the client IP to test the feature. The accuracy depends on the server side.

$ dig @119.29.29.29 www.qq.com +client=119.29.29.29

; <<>> DiG 9.9.3 <<>> @119.29.29.29 www.qq.com +client=119.29.29.29
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64995
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; CLIENT-SUBNET: 119.29.29.29/32/24
;; QUESTION SECTION:
;www.qq.com.            IN  A

;; ANSWER SECTION:
www.qq.com.     300 IN  A   101.226.103.106

;; Query time: 52 msec
;; SERVER: 119.29.29.29#53(119.29.29.29)
;; WHEN: Wed Mar 08 18:00:52 CST 2017
;; MSG SIZE  rcvd: 67
$ dig @119.29.29.29 www.qq.com +client=119.29.29.29 +tcp

; <<>> DiG 9.9.3 <<>> @119.29.29.29 www.qq.com +client=119.29.29.29 +tcp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58331
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.qq.com.            IN  A

;; ANSWER SECTION:
www.qq.com.     43  IN  A   59.37.96.63
www.qq.com.     43  IN  A   14.17.32.211
www.qq.com.     43  IN  A   14.17.42.40

;; Query time: 81 msec
;; SERVER: 119.29.29.29#53(119.29.29.29)
;; WHEN: Wed Mar 08 18:01:32 CST 2017
;; MSG SIZE  rcvd: 87

Acknowledgements

License

This project is under the MIT license. See the LICENSE file for the full license text.

Directories

Path Synopsis
Package core implements the essential features.
Package core implements the essential features.
cache
Package cache implements dns cache feature with edns-client-subnet support.
Package cache implements dns cache feature with edns-client-subnet support.
common
Package common provides common functions.
Package common provides common functions.
hosts
Package hosts provides address lookups from hosts file.
Package hosts provides address lookups from hosts file.
inbound
Package inbound implements dns server for inbound connection.
Package inbound implements dns server for inbound connection.
outbound/clients
Package outbound implements multiple dns client and dispatcher for outbound connection.
Package outbound implements multiple dns client and dispatcher for outbound connection.
outbound/clients/resolver
Package outbound implements multiple dns client and dispatcher for outbound connection.
Package outbound implements multiple dns client and dispatcher for outbound connection.
Package main is the entry point of whole program.
Package main is the entry point of whole program.

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