mirror of https://github.com/0xERR0R/blocky.git
167 lines
3.3 KiB
Go
167 lines
3.3 KiB
Go
package resolver
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import (
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"net"
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"strings"
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"sync/atomic"
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"time"
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"github.com/0xERR0R/blocky/config"
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"github.com/0xERR0R/blocky/util"
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"github.com/miekg/dns"
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"github.com/onsi/ginkgo/v2"
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)
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type MockUDPUpstreamServer struct {
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callCount int32
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ln *net.UDPConn
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answerFn func(request *dns.Msg) (response *dns.Msg)
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}
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func NewMockUDPUpstreamServer() *MockUDPUpstreamServer {
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srv := &MockUDPUpstreamServer{}
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ginkgo.DeferCleanup(srv.Close)
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return srv
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}
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func (t *MockUDPUpstreamServer) WithAnswerRR(answers ...string) *MockUDPUpstreamServer {
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t.answerFn = func(request *dns.Msg) (response *dns.Msg) {
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msg := new(dns.Msg)
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for _, a := range answers {
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rr, err := dns.NewRR(a)
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util.FatalOnError("can't create RR", err)
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msg.Answer = append(msg.Answer, rr)
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}
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return msg
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}
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return t
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}
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func (t *MockUDPUpstreamServer) WithAnswerMsg(answer *dns.Msg) *MockUDPUpstreamServer {
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t.answerFn = func(request *dns.Msg) (response *dns.Msg) {
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return answer
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}
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return t
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}
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func (t *MockUDPUpstreamServer) WithAnswerError(errorCode int) *MockUDPUpstreamServer {
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t.answerFn = func(request *dns.Msg) (response *dns.Msg) {
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msg := new(dns.Msg)
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msg.Rcode = errorCode
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return msg
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}
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return t
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}
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func (t *MockUDPUpstreamServer) WithAnswerFn(fn func(request *dns.Msg) (response *dns.Msg)) *MockUDPUpstreamServer {
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t.answerFn = fn
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return t
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}
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func (t *MockUDPUpstreamServer) WithDelay(delay time.Duration) *MockUDPUpstreamServer {
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answerFn := t.answerFn
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if answerFn == nil {
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panic("WithDelay must be called after a WithAnswer function")
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}
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t.answerFn = func(request *dns.Msg) *dns.Msg {
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time.Sleep(delay)
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return answerFn(request)
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}
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return t
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}
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func (t *MockUDPUpstreamServer) GetCallCount() int {
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return int(atomic.LoadInt32(&t.callCount))
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}
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func (t *MockUDPUpstreamServer) ResetCallCount() {
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atomic.StoreInt32(&t.callCount, 0)
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}
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func (t *MockUDPUpstreamServer) Close() {
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if t.ln != nil {
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_ = t.ln.Close()
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}
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}
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func createConnection() *net.UDPConn {
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a, err := net.ResolveUDPAddr("udp4", ":0")
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util.FatalOnError("can't resolve address: ", err)
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ln, err := net.ListenUDP("udp4", a)
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util.FatalOnError("can't create connection: ", err)
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return ln
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}
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func (t *MockUDPUpstreamServer) Start() config.Upstream {
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ln := createConnection()
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ladr := ln.LocalAddr().String()
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host := strings.Split(ladr, ":")[0]
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p, err := config.ConvertPort(strings.Split(ladr, ":")[1])
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util.FatalOnError("can't convert port: ", err)
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port := p
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t.ln = ln
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go func() {
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const bufferSize = 1024
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for {
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buffer := make([]byte, bufferSize)
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n, addr, err := ln.ReadFromUDP(buffer)
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if err != nil {
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// closed
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break
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}
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go func() {
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msg := new(dns.Msg)
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err = msg.Unpack(buffer[0 : n-1])
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util.FatalOnError("can't deserialize message: ", err)
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response := t.answerFn(msg)
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atomic.AddInt32(&t.callCount, 1)
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// nil should indicate an error
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if response == nil {
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_, _ = ln.WriteToUDP([]byte("dummy"), addr)
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return
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}
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rCode := response.Rcode
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response.SetReply(msg)
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if rCode != 0 {
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response.Rcode = rCode
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}
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b, err := response.Pack()
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util.FatalOnError("can't serialize message: ", err)
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_, _ = ln.WriteToUDP(b, addr)
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}()
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}
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}()
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return config.Upstream{Net: config.NetProtocolTcpUdp, Host: host, Port: port}
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}
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