From 6002823295db02bc24cd9768c1d494ffd7f03937 Mon Sep 17 00:00:00 2001 From: Zeev Diukman Date: Wed, 11 Sep 2024 17:23:32 +0300 Subject: [PATCH] 1 --- .gitconfig | 2 + dns.go | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++++ go.mod | 35 +++++++++++ go.sum | 88 ++++++++++++++++++++++++++++ 4 files changed, 291 insertions(+) create mode 100644 .gitconfig create mode 100644 dns.go create mode 100644 go.mod create mode 100644 go.sum diff --git a/.gitconfig b/.gitconfig new file mode 100644 index 0000000..20cd234 --- /dev/null +++ b/.gitconfig @@ -0,0 +1,2 @@ +[url "git@github.com:zeevdiukman/dns.git"] + insteadOf = https://github.com/ diff --git a/dns.go b/dns.go new file mode 100644 index 0000000..8b317ed --- /dev/null +++ b/dns.go @@ -0,0 +1,166 @@ +package dns + +import ( + "context" + "fmt" + "net" + "path/filepath" + "strconv" + "strings" + "time" + + miekgDNS "github.com/miekg/dns" + "github.com/spf13/viper" + "github.com/zeevdiukman/helper" +) + +type ResponseWriter = miekgDNS.ResponseWriter +type Msg = miekgDNS.Msg +type HandlerFunc = miekgDNS.HandlerFunc + +// func(miekgDNS.ResponseWriter, *miekgDNS.Msg) +type DNS struct { + Config Config + Server Server + Mux Mux + Records Records + Resolver Resolver +} + +type Config struct { + *viper.Viper +} + +type Server struct { + *miekgDNS.Server +} + +type Mux struct { + *miekgDNS.ServeMux +} + +type Records struct { + TypeA map[string]string +} + +type Resolver struct { + *net.Resolver +} + +func New(filePath string) *DNS { + app := &DNS{} + app.ConfigInit(filePath) + app.Records.TypeA = app.Config.GetStringMapString("records.type_a") + app.ServerInit() + app.MuxInit() + app.Resolver = NewResolver("1.1.1.1:53") + app.Server.Handler = app.Mux + return app +} +func (a *DNS) Run() { + a.Server.ListenAndServe() +} +func (a *DNS) ConfigInit(filePath string) { + + dir, file := filepath.Split(filePath) + fe := filepath.Ext(file) + ext, _ := strings.CutPrefix(fe, ".") + name, _ := strings.CutSuffix(file, fe) + + a.Config.Viper = viper.New() + a.Config.AddConfigPath(dir) + a.Config.SetConfigName(name) + a.Config.SetConfigType(ext) + a.Config.ReadInConfig() + +} +func (a *DNS) ServerInit() { + port := a.Config.GetInt("port") + a.Server.Server = &miekgDNS.Server{ + Addr: ":" + strconv.Itoa(port), + Net: a.Config.GetString("network"), + Handler: nil, + } +} +func (a *DNS) MuxInit() { + a.Mux.ServeMux = miekgDNS.NewServeMux() +} + +func NewResolver(DNSserverAddr string) Resolver { + return Resolver{ + &net.Resolver{ + PreferGo: true, + Dial: func(ctx context.Context, network, address string) (net.Conn, error) { + d := net.Dialer{Timeout: 5 * time.Second} + return d.DialContext(ctx, "udp", DNSserverAddr) + }, + }, + } +} + +// func (a *DNS) Handler(f func(a *DNS, w miekgDNS.ResponseWriter, r *miekgDNS.Msg)) miekgDNS.HandlerFunc { +// return func(w miekgDNS.ResponseWriter, r *miekgDNS.Msg) { +// f(a, w, r) +// } +// } + +func (r *Resolver) Lookup(lookupAddr string, DNSserverAddr string) string { + var resp []string + var err error + + ctx := context.Background() + resp, err = r.LookupHost(ctx, lookupAddr) + + if err != nil { + fmt.Println(err.Error()) + } + + return resp[0] +} + +func (a *DNS) HandleTypeA(w miekgDNS.ResponseWriter, r *miekgDNS.Msg) { + t := time.Now() + msg := &miekgDNS.Msg{} + msg.SetReply(r) + q := r.Question[0] + domainName := helper.FtoD(q.Name) + ip := "" + + if ipValue, ok := a.Records.TypeA[domainName]; ok { + ip = ipValue + } else { + dSlices := strings.Split(domainName, ".") + //check if wild card + if len(dSlices) > 2 { + name := dSlices[len(dSlices)-2] + tld := dSlices[len(dSlices)-1] + cname := name + "." + tld + wildCard := "*." + cname + if ipValue, ok := a.Records.TypeA[wildCard]; ok { + ip = ipValue + } else { + //lookup + ip = a.Resolver.Lookup(domainName, "1.1.1.1:53") + } + } + + } + RR_Header := miekgDNS.RR_Header{ + Name: miekgDNS.Fqdn(domainName), + Rrtype: miekgDNS.TypeA, + Class: miekgDNS.ClassINET, + Ttl: 3600, + } + answer_typeA := &miekgDNS.A{ + Hdr: RR_Header, + A: net.ParseIP(ip).To4(), + } + msg.Authoritative = true + msg.RecursionDesired = false + msg.SetRcode(r, miekgDNS.RcodeSuccess) + msg.Answer = append(msg.Answer, answer_typeA) + tt := time.Since(t) + helper.P(tt, " => ", domainName) + + w.WriteMsg(msg) +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..ae97629 --- /dev/null +++ b/go.mod @@ -0,0 +1,35 @@ +module github.com/zeevdiukman/z/dns + +go 1.23.1 + +require github.com/miekg/dns v1.1.62 + +require ( + github.com/fsnotify/fsnotify v1.7.0 // indirect + github.com/hashicorp/hcl v1.0.0 // indirect + github.com/magiconair/properties v1.8.7 // indirect + github.com/mitchellh/mapstructure v1.5.0 // indirect + github.com/pelletier/go-toml/v2 v2.2.3 // indirect + github.com/sagikazarmark/locafero v0.6.0 // indirect + github.com/sagikazarmark/slog-shim v0.1.0 // indirect + github.com/sourcegraph/conc v0.3.0 // indirect + github.com/spf13/afero v1.11.0 // indirect + github.com/spf13/cast v1.7.0 // indirect + github.com/spf13/pflag v1.0.5 // indirect + github.com/subosito/gotenv v1.6.0 // indirect + go.uber.org/atomic v1.11.0 // indirect + go.uber.org/multierr v1.11.0 // indirect + golang.org/x/exp v0.0.0-20240909161429-701f63a606c0 // indirect + golang.org/x/text v0.18.0 // indirect + gopkg.in/ini.v1 v1.67.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect +) + +require ( + github.com/spf13/viper v1.19.0 + golang.org/x/mod v0.21.0 // indirect + golang.org/x/net v0.29.0 // indirect + golang.org/x/sync v0.8.0 // indirect + golang.org/x/sys v0.25.0 // indirect + golang.org/x/tools v0.25.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..6bc7cf4 --- /dev/null +++ b/go.sum @@ -0,0 +1,88 @@ +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA= +github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM= +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/magiconair/properties v1.8.7 h1:IeQXZAiQcpL9mgcAe1Nu6cX9LLw6ExEHKjN0VQdvPDY= +github.com/magiconair/properties v1.8.7/go.mod h1:Dhd985XPs7jluiymwWYZ0G4Z61jb3vdS329zhj2hYo0= +github.com/miekg/dns v1.1.62 h1:cN8OuEF1/x5Rq6Np+h1epln8OiyPWV+lROx9LxcGgIQ= +github.com/miekg/dns v1.1.62/go.mod h1:mvDlcItzm+br7MToIKqkglaGhlFMHJ9DTNNWONWXbNQ= +github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY= +github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo= +github.com/pelletier/go-toml/v2 v2.2.2 h1:aYUidT7k73Pcl9nb2gScu7NSrKCSHIDE89b3+6Wq+LM= +github.com/pelletier/go-toml/v2 v2.2.2/go.mod 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