vonwenm / golang-dns

DNS library in Go

Alternative (more granular) approach to a DNS library.

Less is more.

Complete and usable DNS library. All widely used Resource Records are supported, including the DNSSEC types. It follows a lean and mean philosophy. If there is stuff you should know as a DNS programmer there isn't a convenience function for it. Server side and client side programming is supported, i.e. you can build servers and resolvers with it.

If you like this, you may also be interested in:

• https://github.com/miekg/fks -- a (in)complete nameserver written in Go;
• https://github.com/miekg/unbound -- Go wrapper for the Unbound resolver.

Goals

• KISS;
• Fast
• Small API, if its easy to code in Go, don't make a function for it.

Users

A not-so-up-to-date-list-that-may-be-actually-current:

• https://github.com/abh/geodns
• http://www.statdns.com/
• http://www.dnsinspect.com/
• https://github.com/chuangbo/jianbing-dictionary-dns
• http://www.dns-lg.com/
• https://github.com/fcambus/rrda
• https://github.com/kenshinx/godns
• more? (send pull request if you want to be listed here)

Features

• UDP/TCP queries, IPv4 and IPv6;
• RFC 1035 zone file parsing ($INCLUDE, $ORIGIN, $TTL and $GENERATE (for all record types) are supported;
• Fast:
  • Reply speed around ~ 80K qps (faster hardware results in more qps);
  • Parsing RRs with ~ 100K RR/s, that's 5M records in about 50 seconds;
• Server side programming (mimicking the net/http package);
• Client side programming;
• DNSSEC: signing, validating and key generation for DSA, RSA and ECDSA;
• EDNS0, NSID;
• AXFR/IXFR;
• TSIG;
• DNS name compression.

Have fun!

Miek Gieben - 2010-2012 - [email protected]

Building

Building is done with the go tool. If you have setup your GOPATH correctly, the following should work:

go get github.com/miekg/dns
go build github/com/miekg/dns

A short "how to use the API" is at the beginning of dns.go (this also will show when you call go doc github.com/miekg/dns. Sample programs can be found in the ex directory. They can also be build with: go build.

Supported RFCs

all of them

• 103{4,5} - DNS standard
• 1982 - Serial Arithmetic
• 1876 - LOC record
• 1995 - IXFR
• 1996 - DNS notify
• 2136 - DNS Update (dynamic updates)
• 2181 - RRset definition
• 2537 - RSAMD5 DNS keys
• 2065 - DNSSEC (updated in later RFCs)
• 2671 - EDNS record
• 2782 - SRV record
• 2845 - TSIG record
• 2915 - NAPTR record
• 2929 - DNS IANA Considerations
• 3110 - RSASHA1 DNS keys
• 3225 - DO bit (DNSSEC OK)
• 340{1,2,3} - NAPTR record
• 3445 - Limiting the scope of (DNS)KEY
• 3597 - Unkown RRs
• 403{3,4,5} - DNSSEC + validation functions
• 4255 - SSHFP record
• 4343 - Case insensitivity
• 4408 - SPF record
• 4509 - SHA256 Hash in DS
• 4592 - Wildcards in the DNS
• 4635 - HMAC SHA TSIG
• 4701 - DHCID
• 4892 - id.server
• 5001 - NSID
• 5155 - NSEC3 record
• 5205 - HIP record
• 5702 - SHA2 in the DNS
• 5936 - AXFR
• 6605 - ECDSA
• 6742 - ILNP DNS
• 6891 - EDNS0 update
• xxxx - URI record (draft)
• xxxx - EDNS0 DNS Update Lease (draft)
• xxxx - IEU48/IEU64 records (draft)
• xxxx - Algorithm-Signal (draft)

Loosely based upon

• ldns
• NSD
• Net::DNS
• GRONG