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fix resolver fallback

pull/846/head
ginuerzh 4 years ago
parent
31aee78e79
commit
0247b941ac
3 changed files with 25 additions and 14 deletions
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  1. 2
      go.mod
  2. 7
      go.sum
  3. 30
      resolver.go

2
go.mod
View File

@ -16,7 +16,7 @@ require (
github.com/gorilla/websocket v1.4.2
github.com/klauspost/compress v1.13.6
github.com/lucas-clemente/quic-go v0.26.0
github.com/miekg/dns v1.1.43
github.com/miekg/dns v1.1.47
github.com/milosgajdos/tenus v0.0.3
github.com/ryanuber/go-glob v1.0.0
github.com/shadowsocks/go-shadowsocks2 v0.1.5

7
go.sum
View File

@ -141,8 +141,8 @@ github.com/marten-seemann/qtls-go1-18 v0.1.1 h1:qp7p7XXUFL7fpBvSS1sWD+uSqPvzNQK4
github.com/marten-seemann/qtls-go1-18 v0.1.1/go.mod h1:mJttiymBAByA49mhlNZZGrH5u1uXYZJ+RW28Py7f4m4=
github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
github.com/microcosm-cc/bluemonday v1.0.1/go.mod h1:hsXNsILzKxV+sX77C5b8FSuKF00vh2OMYv+xgHpAMF4=
github.com/miekg/dns v1.1.43 h1:JKfpVSCB84vrAmHzyrsxB5NAr5kLoMXZArPSw7Qlgyg=
github.com/miekg/dns v1.1.43/go.mod h1:+evo5L0630/F6ca/Z9+GAqzhjGyn8/c+TBaOyfEl0V4=
github.com/miekg/dns v1.1.47 h1:J9bWiXbqMbnZPcY8Qi2E3EWIBsIm6MZzzJB9VRg5gL8=
github.com/miekg/dns v1.1.47/go.mod h1:e3IlAVfNqAllflbibAZEWOXOQ+Ynzk/dDozDxY7XnME=
github.com/milosgajdos/tenus v0.0.3 h1:jmaJzwaY1DUyYVD0lM4U+uvP2kkEg1VahDqRFxIkVBE=
github.com/milosgajdos/tenus v0.0.3/go.mod h1:eIjx29vNeDOYWJuCnaHY2r4fq5egetV26ry3on7p8qY=
github.com/mmcloughlin/avo v0.0.0-20200803215136-443f81d77104/go.mod h1:wqKykBG2QzQDJEzvRkcS8x6MiSJkF52hXZsXcjaB3ls=
@ -297,6 +297,7 @@ golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwY
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
golang.org/x/net v0.0.0-20220325170049-de3da57026de h1:pZB1TWnKi+o4bENlbzAgLrEbY4RMYmUIRobMcSmfeYc=
@ -334,7 +335,6 @@ golang.org/x/sys v0.0.0-20200808120158-1030fc2bf1d9/go.mod h1:h1NjWce9XRLGQEsW7w
golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210303074136-134d130e1a04/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@ -371,6 +371,7 @@ golang.org/x/tools v0.0.0-20200425043458-8463f397d07c/go.mod h1:EkVYQZoAsY45+roY
golang.org/x/tools v0.0.0-20200808161706-5bf02b21f123/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
golang.org/x/tools v0.1.1/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
golang.org/x/tools v0.1.10 h1:QjFRCZxdOhBJ/UNgnBZLbNV13DlbnK0quyivTnXJM20=
golang.org/x/tools v0.1.10/go.mod h1:Uh6Zz+xoGYZom868N8YTex3t7RhtHDBrE8Gzo9bV56E=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

30
resolver.go
View File

@ -263,9 +263,7 @@ func (r *resolver) copyServers() []NameServer {
defer r.mux.RUnlock()
servers := make([]NameServer, len(r.servers))
for i := range r.servers {
servers[i] = r.servers[i]
}
copy(servers, r.servers)
return servers
}
@ -312,17 +310,28 @@ func (r *resolver) resolve(ctx context.Context, ex Exchanger, host string) (ips
r.mux.RUnlock()
if prefer == "ipv6" { // prefer ipv6
mq := &dns.Msg{}
mq.SetQuestion(dns.Fqdn(host), dns.TypeAAAA)
ips, err = r.resolveIPs(ctx, ex, mq)
if err != nil || len(ips) > 0 {
if ips, err = r.resolve6(ctx, ex, host); len(ips) > 0 {
return
}
return r.resolve4(ctx, ex, host)
}
mq := &dns.Msg{}
if ips, err = r.resolve4(ctx, ex, host); len(ips) > 0 {
return
}
return r.resolve6(ctx, ex, host)
}
func (r *resolver) resolve4(ctx context.Context, ex Exchanger, host string) (ips []net.IP, err error) {
mq := dns.Msg{}
mq.SetQuestion(dns.Fqdn(host), dns.TypeA)
return r.resolveIPs(ctx, ex, mq)
return r.resolveIPs(ctx, ex, &mq)
}
func (r *resolver) resolve6(ctx context.Context, ex Exchanger, host string) (ips []net.IP, err error) {
mq := dns.Msg{}
mq.SetQuestion(dns.Fqdn(host), dns.TypeAAAA)
return r.resolveIPs(ctx, ex, &mq)
}
func (r *resolver) resolveIPs(ctx context.Context, ex Exchanger, mq *dns.Msg) (ips []net.IP, err error) {
@ -709,7 +718,8 @@ func (ex *dnsExchanger) Exchange(ctx context.Context, query []byte) ([]byte, err
defer c.Close()
conn := &dns.Conn{
Conn: c,
Conn: c,
UDPSize: 1024,
}
if _, err = conn.Write(query); err != nil {
return nil, err

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