Add support for DNS stamps and for DNSCrypt servers

This allows connections to DoH servers using their stamp, and adds
support for DNSCrypt servers by the way.
pull/19/head
Frank Denis 2021-04-24 17:27:43 +02:00 committed by Karan Sharma
parent 48fd5bb792
commit 6d2eae4f58
9 changed files with 139 additions and 12 deletions

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@ -12,7 +12,7 @@
--- ---
**doggo** is a modern command-line DNS client (like _dig_) written in Golang. It outputs information in a neat concise manner and supports protocols like DoH, DoT as well. **doggo** is a modern command-line DNS client (like _dig_) written in Golang. It outputs information in a neat concise manner and supports protocols like DoH, DoT and DNSCrypt as well.
It's totally inspired from [dog](https://github.com/ogham/dog/) which is written in Rust. I wanted to add some features to it but since I don't know Rust, I found it as a nice opportunity It's totally inspired from [dog](https://github.com/ogham/dog/) which is written in Rust. I wanted to add some features to it but since I don't know Rust, I found it as a nice opportunity
to experiment with writing a DNS Client from scratch in `Go` myself. Hence the name `dog` +`go` => **doggo**. to experiment with writing a DNS Client from scratch in `Go` myself. Hence the name `dog` +`go` => **doggo**.
@ -195,6 +195,8 @@ URL scheme of the server is used to identify which resolver to use for lookups.
@tcp:// eg: @1.1.1.1 initiates a TCP resolver for 1.1.1.1:53. @tcp:// eg: @1.1.1.1 initiates a TCP resolver for 1.1.1.1:53.
@https:// eg: @https://cloudflare-dns.com/dns-query initiates a DOH resolver for Cloudflare DoH server. @https:// eg: @https://cloudflare-dns.com/dns-query initiates a DOH resolver for Cloudflare DoH server.
@tls:// eg: @1.1.1.1 initiates a DoT resolver for 1.1.1.1:853. @tls:// eg: @1.1.1.1 initiates a DoT resolver for 1.1.1.1:853.
@sdns:// eg: @sdns://AgcAAAAAAAAABzEuMC4wLjEAEmRucy5jbG91ZGZsYXJlLmNvbQovZG5zLXF1ZXJ5
initiates a DNSCrypt or DoH resolver using its DNS stamp
``` ```
### Query Options ### Query Options

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@ -36,6 +36,7 @@ var appHelpTextTemplate = `{{ "NAME" | color "" "heading" }}:
{{"@tcp://" | color "yellow" ""}} eg: @tcp://1.1.1.1 initiates a {{"TCP" | color "cyan" ""}} resolver for 1.1.1.1:53. {{"@tcp://" | color "yellow" ""}} eg: @tcp://1.1.1.1 initiates a {{"TCP" | color "cyan" ""}} resolver for 1.1.1.1:53.
{{"@https://" | color "yellow" ""}} eg: @https://cloudflare-dns.com/dns-query initiates a {{"DOH" | color "cyan" ""}} resolver for Cloudflare DoH server. {{"@https://" | color "yellow" ""}} eg: @https://cloudflare-dns.com/dns-query initiates a {{"DOH" | color "cyan" ""}} resolver for Cloudflare DoH server.
{{"@tls://" | color "yellow" ""}} eg: @tls://1.1.1.1 initiates a {{"DoT" | color "cyan" ""}} resolver for 1.1.1.1:853. {{"@tls://" | color "yellow" ""}} eg: @tls://1.1.1.1 initiates a {{"DoT" | color "cyan" ""}} resolver for 1.1.1.1:853.
{{"@sdns://" | color "yellow" ""}} initiates a {{"DNSCrypt" | color "cyan" ""}} or {{"DoH" | color "cyan" ""}} resolver using its DNS stamp.
{{ "Query Options" | color "" "heading" }}: {{ "Query Options" | color "" "heading" }}:
{{"-q, --query=HOSTNAME" | color "yellow" ""}} Hostname to query the DNS records for (eg {{"mrkaran.dev" | color "cyan" ""}}). {{"-q, --query=HOSTNAME" | color "yellow" ""}} Hostname to query the DNS records for (eg {{"mrkaran.dev" | color "cyan" ""}}).

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@ -12,7 +12,7 @@ complete -c doggo -s 'n' -l 'nameserver' -d "Address of a specific nameserver to
complete -c doggo -s 'c' -l 'class' -d "Network class of the DNS record being queried" -x -a "IN CH HS" complete -c doggo -s 'c' -l 'class' -d "Network class of the DNS record being queried" -x -a "IN CH HS"
# Transport options # Transport options
complete -c doggo -x -a "@udp:// @tcp:// @https:// @tls://" -d "Select the protocol for resolving queries" complete -c doggo -x -a "@udp:// @tcp:// @https:// @tls:// @sdns://" -d "Select the protocol for resolving queries"
# Resolver options # Resolver options
complete -c doggo -l 'ndots' -d "Specify ndots parameter. Takes value from /etc/resolv.conf if using the system namesever or 1 otherwise" complete -c doggo -l 'ndots' -d "Specify ndots parameter. Takes value from /etc/resolv.conf if using the system namesever or 1 otherwise"

3
go.mod
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@ -3,9 +3,10 @@ module github.com/mr-karan/doggo
go 1.16 go 1.16
require ( require (
github.com/ameshkov/dnscrypt v1.1.0
github.com/ameshkov/dnsstamps v1.0.3
github.com/fatih/color v1.10.0 github.com/fatih/color v1.10.0
github.com/go-chi/chi v1.5.3 github.com/go-chi/chi v1.5.3
github.com/go-chi/render v1.0.1
github.com/knadh/koanf v0.14.0 github.com/knadh/koanf v0.14.0
github.com/mattn/go-runewidth v0.0.9 // indirect github.com/mattn/go-runewidth v0.0.9 // indirect
github.com/miekg/dns v1.1.35 github.com/miekg/dns v1.1.35

20
go.sum
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@ -1,4 +1,14 @@
github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da h1:KjTM2ks9d14ZYCvmHS9iAKVt9AyzRSqNU1qabPih5BY=
github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da/go.mod h1:eHEWzANqSiWQsof+nXEI9bUVUyV6F53Fp89EuCh2EAA=
github.com/aead/poly1305 v0.0.0-20180717145839-3fee0db0b635 h1:52m0LGchQBBVqJRyYYufQuIbVqRawmubW3OFGqK1ekw=
github.com/aead/poly1305 v0.0.0-20180717145839-3fee0db0b635/go.mod h1:lmLxL+FV291OopO93Bwf9fQLQeLyt33VJRUg5VJ30us=
github.com/ameshkov/dnscrypt v1.1.0 h1:2vAt5dD6ZmqlAxEAfzRcLBnkvdf8NI46Kn9InSwQbSI=
github.com/ameshkov/dnscrypt v1.1.0/go.mod h1:ikduAxNLCTEfd1AaCgpIA5TgroIVQ8JY3Vb095fiFJg=
github.com/ameshkov/dnsstamps v1.0.1/go.mod h1:Ii3eUu73dx4Vw5O4wjzmT5+lkCwovjzaEZZ4gKyIH5A=
github.com/ameshkov/dnsstamps v1.0.3 h1:Srzik+J9mivH1alRACTbys2xOxs0lRH9qnTA7Y1OYVo=
github.com/ameshkov/dnsstamps v1.0.3/go.mod h1:Ii3eUu73dx4Vw5O4wjzmT5+lkCwovjzaEZZ4gKyIH5A=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@ -9,8 +19,6 @@ github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWo
github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ= github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
github.com/go-chi/chi v1.5.3 h1:+DVDS9/D3MTbEu3WrrH3oz9oP6PlSPSNj8LLw3X17yU= github.com/go-chi/chi v1.5.3 h1:+DVDS9/D3MTbEu3WrrH3oz9oP6PlSPSNj8LLw3X17yU=
github.com/go-chi/chi v1.5.3/go.mod h1:Q8xfe6s3fjZyMr8ZTv5jL+vxhVaFyCq2s+RvSfzTD0E= github.com/go-chi/chi v1.5.3/go.mod h1:Q8xfe6s3fjZyMr8ZTv5jL+vxhVaFyCq2s+RvSfzTD0E=
github.com/go-chi/render v1.0.1 h1:4/5tis2cKaNdnv9zFLfXzcquC9HbeZgCnxGnKrltBS8=
github.com/go-chi/render v1.0.1/go.mod h1:pq4Rr7HbnsdaeHagklXub+p6Wd16Af5l9koip1OvJns=
github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4= github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ= github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
github.com/joho/godotenv v1.3.0 h1:Zjp+RcGpHhGlrMbJzXTrZZPrWj+1vfm90La1wgB6Bhc= github.com/joho/godotenv v1.3.0 h1:Zjp+RcGpHhGlrMbJzXTrZZPrWj+1vfm90La1wgB6Bhc=
@ -24,6 +32,7 @@ github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Ky
github.com/mattn/go-runewidth v0.0.7/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI= github.com/mattn/go-runewidth v0.0.7/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0= github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI= github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
github.com/miekg/dns v1.1.29/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
github.com/miekg/dns v1.1.35 h1:oTfOaDH+mZkdcgdIjH6yBajRGtIwcwcaR+rt23ZSrJs= github.com/miekg/dns v1.1.35 h1:oTfOaDH+mZkdcgdIjH6yBajRGtIwcwcaR+rt23ZSrJs=
github.com/miekg/dns v1.1.35/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM= github.com/miekg/dns v1.1.35/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
github.com/mitchellh/mapstructure v1.2.2 h1:dxe5oCinTXiTIcfgmZecdCzPmAJKd46KsCWc35r0TV4= github.com/mitchellh/mapstructure v1.2.2 h1:dxe5oCinTXiTIcfgmZecdCzPmAJKd46KsCWc35r0TV4=
@ -45,13 +54,15 @@ github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UV
github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0= github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg= github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550 h1:ObdrDkeb4kJdCP557AjRjq69pTHfNouLtWZG7j9rPN8=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59 h1:3zb4D3T4G8jdExgVU/95+vQXfpEPiMdCaZgmGVxjNHM=
golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg= golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190923162816-aa69164e4478 h1:l5EDrHhldLYb3ZRHDUhXF7Om7MvYXnkV9/iQNo1lX6g=
golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e h1:3G+cUijn7XD+S4eJFddp53Pv7+slrESplyjG25HgL+k=
golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU= golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@ -61,6 +72,7 @@ golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7w
golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200331124033-c3d80250170d h1:nc5K6ox/4lTFbMVSL9WRR81ixkcwXThoiF6yf+R9scA= golang.org/x/sys v0.0.0-20200331124033-c3d80250170d h1:nc5K6ox/4lTFbMVSL9WRR81ixkcwXThoiF6yf+R9scA=
golang.org/x/sys v0.0.0-20200331124033-c3d80250170d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200331124033-c3d80250170d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

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@ -5,6 +5,7 @@ import (
"net" "net"
"net/url" "net/url"
"github.com/ameshkov/dnsstamps"
"github.com/mr-karan/doggo/pkg/config" "github.com/mr-karan/doggo/pkg/config"
"github.com/mr-karan/doggo/pkg/models" "github.com/mr-karan/doggo/pkg/models"
) )
@ -60,6 +61,23 @@ func initNameserver(n string) (models.Nameserver, error) {
if err != nil { if err != nil {
return ns, err return ns, err
} }
if u.Scheme == "sdns" {
stamp, err := dnsstamps.NewServerStampFromString(n)
if err != nil {
return ns, err
}
switch stamp.Proto {
case dnsstamps.StampProtoTypeDoH:
ns.Type = models.DOHResolver
address := url.URL{Scheme: "https", Host: stamp.ProviderName, Path: stamp.Path}
ns.Address = address.String()
case dnsstamps.StampProtoTypeDNSCrypt:
ns.Type = models.DNSCryptResolver
ns.Address = n
default:
return ns, fmt.Errorf("unsupported protocol: %v", stamp.Proto.String())
}
}
if u.Scheme == "https" { if u.Scheme == "https" {
ns.Type = models.DOHResolver ns.Type = models.DOHResolver
ns.Address = u.String() ns.Address = u.String()

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@ -8,11 +8,12 @@ const (
// DefaultUDPPort specifies the default port for a DNS server connecting over UDP // DefaultUDPPort specifies the default port for a DNS server connecting over UDP
DefaultUDPPort = "53" DefaultUDPPort = "53"
// DefaultTCPPort specifies the default port for a DNS server connecting over TCP // DefaultTCPPort specifies the default port for a DNS server connecting over TCP
DefaultTCPPort = "53" DefaultTCPPort = "53"
UDPResolver = "udp" UDPResolver = "udp"
DOHResolver = "doh" DOHResolver = "doh"
TCPResolver = "tcp" TCPResolver = "tcp"
DOTResolver = "dot" DOTResolver = "dot"
DNSCryptResolver = "dnscrypt"
) )
// QueryFlags is used store the query params // QueryFlags is used store the query params

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@ -0,0 +1,81 @@
package resolvers
import (
"github.com/ameshkov/dnscrypt"
"github.com/miekg/dns"
"github.com/sirupsen/logrus"
)
// DNSCryptResolver represents the config options for setting up a Resolver.
type DNSCryptResolver struct {
client *dnscrypt.Client
serverInfo *dnscrypt.ServerInfo
server string
resolverOptions Options
}
// DNSCryptResolverOpts holds options for setting up a DNSCrypt resolver.
type DNSCryptResolverOpts struct {
IPv4Only bool
IPv6Only bool
UseTLS bool
UseTCP bool
}
// NewDNSCryptResolver accepts a list of nameservers and configures a DNS resolver.
func NewDNSCryptResolver(server string, dnscryptOpts DNSCryptResolverOpts, resolverOpts Options) (Resolver, error) {
net := "udp"
if dnscryptOpts.UseTCP {
net = "tcp"
}
client := &dnscrypt.Client{Proto: net, AdjustPayloadSize: true}
serverInfo, _, err := client.Dial(server)
if err != nil {
return nil, err
}
return &DNSCryptResolver{
client: client,
serverInfo: serverInfo,
server: server,
resolverOptions: resolverOpts,
}, nil
}
// Lookup takes a dns.Question and sends them to DNS Server.
// It parses the Response from the server in a custom output format.
func (r *DNSCryptResolver) Lookup(question dns.Question) (Response, error) {
var (
rsp Response
messages = prepareMessages(question, r.resolverOptions.Ndots, r.resolverOptions.SearchList)
)
for _, msg := range messages {
r.resolverOptions.Logger.WithFields(logrus.Fields{
"domain": msg.Question[0].Name,
"ndots": r.resolverOptions.Ndots,
"nameserver": r.serverInfo.ProviderName,
}).Debug("Attempting to resolve")
in, rtt, err := r.client.Exchange(&msg, r.serverInfo)
if err != nil {
return rsp, err
}
// pack questions in output.
for _, q := range msg.Question {
ques := Question{
Name: q.Name,
Class: dns.ClassToString[q.Qclass],
Type: dns.TypeToString[q.Qtype],
}
rsp.Questions = append(rsp.Questions, ques)
}
// get the authorities and answers.
output := parseMessage(in, rtt, r.server)
rsp.Authorities = output.Authorities
rsp.Answers = output.Answers
if len(output.Answers) > 0 {
// stop iterating the searchlist.
break
}
}
return rsp, nil
}

View File

@ -127,6 +127,17 @@ func LoadResolvers(opts Options) ([]Resolver, error) {
} }
rslvrs = append(rslvrs, rslvr) rslvrs = append(rslvrs, rslvr)
} }
if ns.Type == models.DNSCryptResolver {
opts.Logger.Debug("initiating DNSCrypt resolver")
rslvr, err := NewDNSCryptResolver(ns.Address,
DNSCryptResolverOpts{
UseTCP: false,
}, resolverOpts)
if err != nil {
return rslvrs, err
}
rslvrs = append(rslvrs, rslvr)
}
} }
return rslvrs, nil return rslvrs, nil
} }