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Andrey Meshkov
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coverage.txt
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coverage.txt
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build
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This is free and unencumbered software released into the public domain.
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Anyone is free to copy, modify, publish, use, compile, sell, or
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distribute this software, either in source code form or as a compiled
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binary, for any purpose, commercial or non-commercial, and by any
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means.
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In jurisdictions that recognize copyright laws, the author or authors
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of this software dedicate any and all copyright interest in the
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software to the public domain. We make this dedication for the benefit
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of the public at large and to the detriment of our heirs and
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successors. We intend this dedication to be an overt act of
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relinquishment in perpetuity of all present and future rights to this
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software under copyright law.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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For more information, please refer to <http://unlicense.org/>
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# DNSCrypt Go
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Golang-implementation of the [DNSCrypt v2 protocol](https://dnscrypt.info/protocol).
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This repo includes everything you need to work with DNSCrypt. You can run your own resolver, make DNS lookups to other DNSCrypt resolvers, and you can use it as a library in your own projects.
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* [Command-line tool](#commandline)
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* [Running a server](#runningserver)
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* [Making lookups](#lookup)
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* [Programming interface](#api)
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* [Client](#client)
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* [Server](#server)
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## <a id="commandline"></a> Command-line tool
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`dnscrypt` is a helper tool that can work as a DNSCrypt client or server.
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Please note, that even though this tool can work as a server, it's purpose is merely testing. Use [dnsproxy](https://github.com/AdguardTeam/dnsproxy) or [AdGuard Home](https://github.com/AdguardTeam/AdGuardHome) for real-life purposes.
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### <a id="runningserver"></a> Running a server
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Generate a configuration file for running a DNSCrypt server:
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```shell script
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./dnscrypt generate --provider-name=2.dnscrypt-cert.example.org --out=config.yaml
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```
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It will generate a configuration file that looks like this:
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```yaml
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provider_name: 2.dnscrypt-cert.example.org
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public_key: F11DDBCC4817E543845FDDD4CB881849B64226F3DE397625669D87B919BC4FB0
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private_key: 5752095FFA56D963569951AFE70FE1690F378D13D8AD6F8054DFAA100907F8B6F11DDBCC4817E543845FDDD4CB881849B64226F3DE397625669D87B919BC4FB0
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resolver_secret: 9E46E79FEB3AB3D45F4EB3EA957DEAF5D9639A0179F1850AFABA7E58F87C74C4
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resolver_public: 9327C5E64783E19C339BD6B680A56DB85521CC6E4E0CA5DF5274E2D3CE026C6B
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es_version: 1
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certificate_ttl: 0s
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```
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* `provider_name` - DNSCrypt resolver name.
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* `public_key`, `private_key` - keypair that is used by the DNSCrypt resolver to sign the certificate.
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* `resolver_secret`, `resolver_public` - keypair that is used by the DNSCrypt resolver to encrypt and decrypt messages.
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* `es_version` - crypto to use. Can be `1` (XSalsa20Poly1305) or `2` (XChacha20Poly1305).
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* `certificate_ttl` - certificate time-to-live. By default it's set to `0` and in this case 1-year cert is generated. The certificate is generated on `dnscrypt` start-up and it will only be valid for the specified amount of time. You should periodically restart `dnscrypt` to rotate the cert.
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This configuration file can be used to run a DNSCrypt forwarding server:
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```shell script
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./dnscrypt server --config=config.yaml --forward=94.140.14.140:53
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```
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Now you can go to https://dnscrypt.info/stamps and use `provider_name` and `public_key` from this configuration to generate a DNS stamp. Here's how it looks like for a server running on `127.0.0.1:443`:
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```
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sdns://AQcAAAAAAAAADTEyNy4wLjAuMTo0NDMg8R3bzEgX5UOEX93Uy4gYSbZCJvPeOXYlZp2HuRm8T7AbMi5kbnNjcnlwdC1jZXJ0LmV4YW1wbGUub3Jn
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```
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### <a id="lookup"></a> Making lookups
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You can use that stamp to send a DNSCrypt request to your server:
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```
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./dnscrypt lookup-stamp \
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--stamp=sdns://AQcAAAAAAAAADTEyNy4wLjAuMTo0NDMg8R3bzEgX5UOEX93Uy4gYSbZCJvPeOXYlZp2HuRm8T7AbMi5kbnNjcnlwdC1jZXJ0LmV4YW1wbGUub3Jn \
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--domain=example.org \
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--type=a
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```
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You can also send a DNSCrypt request using a command that does not require stamps:
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```
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./dnscrypt lookup \
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--provider-name=2.dnscrypt-cert.opendns.com \
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--public-key=b7351140206f225d3e2bd822d7fd691ea1c33cc8d6668d0cbe04bfabca43fb79 \
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--addr=208.67.220.220 \
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--domain=example.org \
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--type=a
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```
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## <a id="api"></a> Programming interface
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### <a id="client"></a> Client
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```go
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// AdGuard DNS stamp
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stampStr := "sdns://AQIAAAAAAAAAFDE3Ni4xMDMuMTMwLjEzMDo1NDQzINErR_JS3PLCu_iZEIbq95zkSV2LFsigxDIuUso_OQhzIjIuZG5zY3J5cHQuZGVmYXVsdC5uczEuYWRndWFyZC5jb20"
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// Initializing the DNSCrypt client
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c := dnscrypt.Client{Net: "udp", Timeout: 10 * time.Second}
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// Fetching and validating the server certificate
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resolverInfo, err := client.Dial(stampStr)
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if err != nil {
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return err
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}
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// Create a DNS request
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req := dns.Msg{}
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req.Id = dns.Id()
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req.RecursionDesired = true
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req.Question = []dns.Question{
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{Name: "google-public-dns-a.google.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET},
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}
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// Get the DNS response
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reply, err := c.Exchange(&req, resolverInfo)
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```
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## <a id="server"></a> Server
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```go
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// Prepare the test DNSCrypt server config
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rc, err := dnscrypt.GenerateResolverConfig("example.org", nil)
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if err != nil {
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return err
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}
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cert, err := rc.CreateCert()
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if err != nil {
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return err
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}
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s := &dnscrypt.Server{
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ProviderName: rc.ProviderName,
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ResolverCert: cert,
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Handler: dnscrypt.DefaultHandler,
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}
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// Prepare TCP listener
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tcpConn, err := net.ListenTCP("tcp", &net.TCPAddr{IP: net.IPv4zero, Port: 443})
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if err != nil {
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return err
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}
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// Prepare UDP listener
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udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 443})
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if err != nil {
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return err
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}
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// Start the server
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go s.ServeUDP(udpConn)
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go s.ServeTCP(tcpConn)
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```
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