mirror of
https://github.com/AdguardTeam/AdGuardHome.git
synced 2024-11-25 22:45:46 +03:00
Added factory method for creating DNS upstreams
This commit is contained in:
Andrey Meshkov
parent
a6022fc198
commit
9bc4bf66ed
3 changed files with 112 additions and 41 deletions
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@ -1,6 +1,84 @@
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package upstream
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import "github.com/miekg/dns"
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import (
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"github.com/miekg/dns"
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"golang.org/x/net/context"
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"net"
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"strings"
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)
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// Detects the upstream type from the specified url and creates a proper Upstream object
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func NewUpstream(url string, bootstrap string) (Upstream, error) {
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proto := "udp"
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prefix := ""
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switch {
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case strings.HasPrefix(url, "tcp://"):
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proto = "tcp"
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prefix = "tcp://"
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case strings.HasPrefix(url, "tls://"):
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proto = "tcp-tls"
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prefix = "tls://"
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case strings.HasPrefix(url, "https://"):
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return NewHttpsUpstream(url, bootstrap)
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}
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hostname := strings.TrimPrefix(url, prefix)
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host, port, err := net.SplitHostPort(hostname)
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if err != nil {
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// Set port depending on the protocol
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switch proto {
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case "udp":
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port = "53"
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case "tcp":
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port = "53"
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case "tcp-tls":
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port = "853"
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}
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// Set host = hostname
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host = hostname
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}
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// Try to resolve the host address (or check if it's an IP address)
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bootstrapResolver := CreateResolver(bootstrap)
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ips, err := bootstrapResolver.LookupIPAddr(context.Background(), host)
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if err != nil || len(ips) == 0 {
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return nil, err
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}
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addr := ips[0].String()
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endpoint := net.JoinHostPort(addr, port)
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tlsServerName := ""
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if proto == "tcp-tls" && host != addr {
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// Check if we need to specify TLS server name
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tlsServerName = host
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}
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return NewDnsUpstream(endpoint, proto, tlsServerName)
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}
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func CreateResolver(bootstrap string) *net.Resolver {
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bootstrapResolver := net.DefaultResolver
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if bootstrap != "" {
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bootstrapResolver = &net.Resolver{
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PreferGo: true,
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Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
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var d net.Dialer
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conn, err := d.DialContext(ctx, network, bootstrap)
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return conn, err
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},
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}
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}
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return bootstrapResolver
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}
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// Performs a simple health-check of the specified upstream
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func IsAlive(u Upstream) (bool, error) {
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@ -27,7 +27,7 @@ type HttpsUpstream struct {
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endpoint *url.URL
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}
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// NewHttpsUpstream creates a new DNS-over-HTTPS upstream from hostname
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// NewHttpsUpstream creates a new DNS-over-HTTPS upstream from the specified url
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func NewHttpsUpstream(endpoint string, bootstrap string) (Upstream, error) {
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u, err := url.Parse(endpoint)
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if err != nil {
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@ -35,18 +35,7 @@ func NewHttpsUpstream(endpoint string, bootstrap string) (Upstream, error) {
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}
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// Initialize bootstrap resolver
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bootstrapResolver := net.DefaultResolver
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if bootstrap != "" {
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bootstrapResolver = &net.Resolver{
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PreferGo: true,
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Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
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var d net.Dialer
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conn, err := d.DialContext(ctx, network, bootstrap)
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return conn, err
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},
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}
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}
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bootstrapResolver := CreateResolver(bootstrap)
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dialer := &net.Dialer{
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Timeout: defaultTimeout,
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KeepAlive: defaultKeepAlive,
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@ -9,16 +9,17 @@ import (
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func TestDnsUpstreamIsAlive(t *testing.T) {
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var tests = []struct {
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endpoint string
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proto string
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url string
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bootstrap string
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}{
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{"8.8.8.8:53", "udp"},
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{"8.8.8.8:53", "tcp"},
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{"1.1.1.1:53", "udp"},
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{"8.8.8.8:53", "8.8.8.8:53"},
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{"1.1.1.1", ""},
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{"tcp://1.1.1.1:53", ""},
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{"176.103.130.130:5353", ""},
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}
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for _, test := range tests {
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u, err := NewDnsUpstream(test.endpoint, test.proto, "")
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u, err := NewUpstream(test.url, test.bootstrap)
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if err != nil {
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t.Errorf("cannot create a DNS upstream")
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@ -36,11 +37,11 @@ func TestHttpsUpstreamIsAlive(t *testing.T) {
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}{
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{"https://cloudflare-dns.com/dns-query", "8.8.8.8:53"},
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{"https://dns.google.com/experimental", "8.8.8.8:53"},
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{"https://doh.cleanbrowsing.org/doh/security-filter/", ""}, // TODO: status 201??
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{"https://doh.cleanbrowsing.org/doh/security-filter/", ""},
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}
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for _, test := range tests {
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u, err := NewHttpsUpstream(test.url, test.bootstrap)
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u, err := NewUpstream(test.url, test.bootstrap)
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if err != nil {
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t.Errorf("cannot create a DNS-over-HTTPS upstream")
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@ -53,16 +54,17 @@ func TestHttpsUpstreamIsAlive(t *testing.T) {
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func TestDnsOverTlsIsAlive(t *testing.T) {
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var tests = []struct {
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endpoint string
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tlsServerName string
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url string
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bootstrap string
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}{
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{"1.1.1.1:853", ""},
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{"9.9.9.9:853", ""},
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{"185.228.168.10:853", "security-filter-dns.cleanbrowsing.org"},
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{"tls://1.1.1.1", ""},
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{"tls://9.9.9.9:853", ""},
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{"tls://security-filter-dns.cleanbrowsing.org", "8.8.8.8:53"},
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{"tls://adult-filter-dns.cleanbrowsing.org:853", "8.8.8.8:53"},
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}
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for _, test := range tests {
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u, err := NewDnsUpstream(test.endpoint, "tcp-tls", test.tlsServerName)
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u, err := NewUpstream(test.url, test.bootstrap)
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if err != nil {
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t.Errorf("cannot create a DNS-over-TLS upstream")
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@ -75,16 +77,17 @@ func TestDnsOverTlsIsAlive(t *testing.T) {
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func TestDnsUpstream(t *testing.T) {
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var tests = []struct {
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endpoint string
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proto string
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url string
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bootstrap string
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}{
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{"8.8.8.8:53", "udp"},
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{"8.8.8.8:53", "tcp"},
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{"1.1.1.1:53", "udp"},
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{"8.8.8.8:53", "8.8.8.8:53"},
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{"1.1.1.1", ""},
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{"tcp://1.1.1.1:53", ""},
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{"176.103.130.130:5353", ""},
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}
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for _, test := range tests {
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u, err := NewDnsUpstream(test.endpoint, test.proto, "")
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u, err := NewUpstream(test.url, test.bootstrap)
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if err != nil {
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t.Errorf("cannot create a DNS upstream")
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@ -106,7 +109,7 @@ func TestHttpsUpstream(t *testing.T) {
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}
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for _, test := range tests {
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u, err := NewHttpsUpstream(test.url, test.bootstrap)
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u, err := NewUpstream(test.url, test.bootstrap)
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if err != nil {
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t.Errorf("cannot create a DNS-over-HTTPS upstream")
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@ -119,16 +122,17 @@ func TestHttpsUpstream(t *testing.T) {
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func TestDnsOverTlsUpstream(t *testing.T) {
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var tests = []struct {
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endpoint string
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tlsServerName string
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url string
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bootstrap string
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}{
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{"1.1.1.1:853", ""},
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{"9.9.9.9:853", ""},
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{"185.228.168.10:853", "security-filter-dns.cleanbrowsing.org"},
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{"tls://1.1.1.1", ""},
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{"tls://9.9.9.9:853", ""},
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{"tls://security-filter-dns.cleanbrowsing.org", "8.8.8.8:53"},
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{"tls://adult-filter-dns.cleanbrowsing.org:853", "8.8.8.8:53"},
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}
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for _, test := range tests {
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u, err := NewDnsUpstream(test.endpoint, "tcp-tls", test.tlsServerName)
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u, err := NewUpstream(test.url, test.bootstrap)
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if err != nil {
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t.Errorf("cannot create a DNS-over-TLS upstream")
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