diff --git a/.gitignore b/.gitignore index f4d432a..2431e29 100644 --- a/.gitignore +++ b/.gitignore @@ -5,6 +5,7 @@ *.dll *.so *.dylib +dyndns # Test binary, built with `go test -c` *.test @@ -14,4 +15,3 @@ # Dependency directories (remove the comment below to include it) # vendor/ - diff --git a/cmd/config.go b/cmd/config.go new file mode 100644 index 0000000..2a8d936 --- /dev/null +++ b/cmd/config.go @@ -0,0 +1,30 @@ +package cmd + +import ( + "fmt" + "log" + + "gitea.nehmer.net/torben/dyndns/service" + "gitea.nehmer.net/torben/dyndns/webapi" + "github.com/spf13/viper" +) + +func InitializeViper() { + viper.SetConfigName("conf.yml") + viper.SetConfigType("yaml") + viper.AddConfigPath("/etc/dyndns") + viper.AddConfigPath(".") + + if err := viper.ReadInConfig(); err != nil { + if _, ok := err.(viper.ConfigFileNotFoundError); ok { + log.Println("Could not find configfile, using defaults") + } else { + log.Fatalln(fmt.Sprintf("configuration is invalid: %s", err)) + } + } +} + +func setAllConfigDefaults() { + service.SetConfigDefaults() + webapi.SetConfigDefaults() +} diff --git a/cmd/dns-update.go b/cmd/dns-update.go new file mode 100644 index 0000000..4e5d7df --- /dev/null +++ b/cmd/dns-update.go @@ -0,0 +1,39 @@ +package cmd + +import ( + "log" + + "gitea.nehmer.net/torben/dyndns/service" + "github.com/spf13/cobra" + "github.com/spf13/viper" +) + +var cmdDNSUpdate = &cobra.Command{ + Use: "dns-update", + Short: "Dynamically update a DNS record", + Long: `Dynamically updates a given DNS FQDN based on the given v4 and/or v6 addresses. +At least one IP must be specified, the call fails if both IPs are empty.`, + // Run is defined inline in init to capture Flag variables in the closure +} + +func init() { + rootCmd.AddCommand(cmdDNSUpdate) + ip4 := cmdDNSUpdate.Flags().IPP("ipv4", "4", nil, "IPv4 Address to set") + ip6 := cmdDNSUpdate.Flags().IPP("ipv6", "6", nil, "IPv6 Address to set") + name := cmdDNSUpdate.Flags().StringP("name", "n", "", "Hostname to set within the domain") + cmdDNSUpdate.MarkFlagRequired("name") + domain := cmdDNSUpdate.Flags().StringP("domain", "d", "", "Domain to set the records in.") + cmdDNSUpdate.MarkFlagRequired("domain") + + cmdDNSUpdate.Run = func(cmd *cobra.Command, args []string) { + log.Printf("Configuration in use: %v", viper.AllSettings()) + service.LoadConfig() + + err := service.UpdateDNSEntry(*domain, *name, *ip4, *ip6) + if err != nil { + log.Fatalf("Could not update DNS: %s", err) + } + log.Println("DNS has been successfully updated.") + } + +} diff --git a/cmd/nft-update.go b/cmd/nft-update.go new file mode 100644 index 0000000..5ae570a --- /dev/null +++ b/cmd/nft-update.go @@ -0,0 +1,40 @@ +package cmd + +import ( + "log" + + "gitea.nehmer.net/torben/dyndns/service" + "github.com/spf13/cobra" + "github.com/spf13/viper" +) + +var cmdNFTUpdate = &cobra.Command{ + Use: "nft-update", + Short: "Dynamically update a NFT firewall", + Long: `Dynamically updates the given NFT Firewall sets based on the given v4 and/or v6 addresses. +At least one IP must be specified, the call fails if both IPs are empty. +The call will flush the sets given in the table before adding the IPs.`, + // Run is defined inline in init to capture Flag variables in the closure +} + +func init() { + rootCmd.AddCommand(cmdNFTUpdate) + ip4 := cmdNFTUpdate.Flags().IPP("ipv4", "4", nil, "IPv4 Address to add to the set") + ip6 := cmdNFTUpdate.Flags().IPP("ipv6", "6", nil, "IPv6 Address to add to the set") + table := cmdNFTUpdate.Flags().StringP("table", "t", "", "The name of the NFT table to modifiy") + cmdNFTUpdate.MarkFlagRequired("table") + set4 := cmdNFTUpdate.Flags().StringP("set4", "s", "", "The IPv4 NFT set name in the given table.") + set6 := cmdNFTUpdate.Flags().StringP("set6", "r", "", "The IPv6 NFT Set name in the given table.") + + cmdNFTUpdate.Run = func(cmd *cobra.Command, args []string) { + log.Printf("Configuration in use: %v", viper.AllSettings()) + service.LoadConfig() + + err := service.UpdateNFTSets(*table, *set4, *ip4, *set6, *ip6) + if err != nil { + log.Fatalf("Could not update NFT: %s", err) + } + log.Println("NFT has been successfully updated.") + } + +} diff --git a/cmd/root.go b/cmd/root.go new file mode 100644 index 0000000..140ef32 --- /dev/null +++ b/cmd/root.go @@ -0,0 +1,23 @@ +package cmd + +import ( + "fmt" + "os" + + "github.com/spf13/cobra" +) + +var rootCmd = &cobra.Command{ + Use: "dyndns", + Short: "Go DynDNS Server", + Long: `A DynDNS Server implementation in Go, requires both an +NFTable Firewall and a properly configured Bind DNS Server.`, +} + +func Exec() { + err := rootCmd.Execute() + if err != nil { + fmt.Println(err) + os.Exit(1) + } +} diff --git a/cmd/serve.go b/cmd/serve.go new file mode 100644 index 0000000..ec3da57 --- /dev/null +++ b/cmd/serve.go @@ -0,0 +1,28 @@ +package cmd + +import ( + "log" + + "gitea.nehmer.net/torben/dyndns/service" + "gitea.nehmer.net/torben/dyndns/webapi" + "github.com/spf13/cobra" + "github.com/spf13/viper" +) + +var cmdServe = &cobra.Command{ + Use: "server", + Short: "Start webserver", + Long: ``, + Run: func(cmd *cobra.Command, args []string) { + log.Printf("Configuration in use: %v", viper.AllSettings()) + webapi.LoadConfig() + service.LoadConfig() + webapi.Server() + }, +} + +func init() { + rootCmd.AddCommand(cmdServe) + cmdServe.Flags().StringP("ListenAddress", "l", "", "ListenAddress for the application server") + viper.BindPFlag("WebAPI.ListenAddress", cmdServe.Flags().Lookup("ListenAddress")) +} diff --git a/cmd/write-default-config.go b/cmd/write-default-config.go new file mode 100644 index 0000000..c9d10c8 --- /dev/null +++ b/cmd/write-default-config.go @@ -0,0 +1,41 @@ +package cmd + +import ( + "log" + "path/filepath" + + "github.com/spf13/cobra" + "github.com/spf13/viper" +) + +var cmdWriteDefaultConfig = &cobra.Command{ + Use: "write-default-config", + Short: "Write default config to file", + Long: `Writes the default configuration to a new configuration file, which +can be further customized by you.`, + // Run is defined inline in init to capture Flag variables in the closure +} + +func init() { + rootCmd.AddCommand(cmdWriteDefaultConfig) + filename := cmdWriteDefaultConfig.Flags().StringP("filename", "f", "conf-default.yml", + "The config filename to use, defaults to conf-default.yml") + + cmdWriteDefaultConfig.Run = func(cmd *cobra.Command, args []string) { + writeDefaultConfig(*filename) + } +} + +func writeDefaultConfig(filename string) { + if filepath.Ext(filename) != ".yml" { + log.Fatalln("The default config filename must end in .yml") + } + + viper.Reset() + setAllConfigDefaults() + err := viper.WriteConfigAs(filename) + if err != nil { + log.Fatalf("Could not write default configuration file %s: %s", filename, err) + } + log.Printf("Default configuration written as %s", filename) +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..81472d8 --- /dev/null +++ b/go.mod @@ -0,0 +1,11 @@ +module gitea.nehmer.net/torben/dyndns + +go 1.16 + +require ( + github.com/google/nftables v0.0.0-20210818072602-d553cd2d411d + github.com/gorilla/mux v1.8.0 + github.com/miekg/dns v1.0.14 + github.com/spf13/cobra v1.2.1 + github.com/spf13/viper v1.8.1 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..d5d5f78 --- /dev/null +++ b/go.sum @@ -0,0 +1,614 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= +cloud.google.com/go v0.50.0/go.mod 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+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k= +rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= +rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0= +rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA= diff --git a/main.go b/main.go new file mode 100644 index 0000000..feb9fc1 --- /dev/null +++ b/main.go @@ -0,0 +1,10 @@ +package main + +import ( + "gitea.nehmer.net/torben/dyndns/cmd" +) + +func main() { + cmd.InitializeViper() + cmd.Exec() +} diff --git a/samples.txt b/samples.txt new file mode 100644 index 0000000..d405bbb --- /dev/null +++ b/samples.txt @@ -0,0 +1,5 @@ +/update?UserName=benutzer&Password=kennwort&Domain=atlantis.nehmer.net&IPv4=79.202.5.79&IPv6=2003:ef:8fff:905:7eff:4dff:fe7e:e901&DualStack=1&IPv6Net=2003:ef:8f08:f600::/64 + +ispconfig.vhost + ProxyPass /hello http://127.0.0.1:8080/hello + ProxyPass /update http://127.0.0.1:8080/update diff --git a/service/clientinfo.go b/service/clientinfo.go new file mode 100644 index 0000000..405b80c --- /dev/null +++ b/service/clientinfo.go @@ -0,0 +1,70 @@ +package service + +import ( + "errors" + "fmt" + "net" + "net/url" +) + +type ClientInfo struct { + IPv4 net.IP + IPv6 net.IP + UserName string + Password string + Domain string + DualStack bool + IPv6Net *net.IPNet +} + +func (ci *ClientInfo) String() string { + return fmt.Sprintf("IPv4: %v, IPv6: %v, UserName: %v, Password: %v, Domain: %v, DualStack: %v, IPv6Net: %v", + ci.IPv4, ci.IPv6, ci.UserName, ci.Password, ci.Domain, ci.DualStack, ci.IPv6Net) +} + +func CreateClientInfoFromForm(form url.Values) (*ClientInfo, error) { + ci := &ClientInfo{} + + if form.Get("IPv4") != "" { + if ci.IPv4 = net.ParseIP(form.Get("IPv4")); ci.IPv4 == nil { + return nil, errors.New("could not parse IPv4 address") + } + } + + if form.Get("IPv6") != "" { + if ci.IPv6 = net.ParseIP(form.Get("IPv6")); ci.IPv6 == nil { + return nil, errors.New("could not parse IPv6 address") + } + } + + ci.UserName = form.Get("UserName") + if ci.UserName == "" { + return nil, errors.New("a UserName must be specified") + } + + ci.Password = form.Get("Password") + if ci.Password == "" { + return nil, errors.New("a Password must be specified") + } + + ci.Domain = form.Get("Domain") + if ci.Domain == "" { + return nil, errors.New("a Domain must be specified") + } + + if form.Get("DualStack") == "1" { + ci.DualStack = true + } else { + ci.DualStack = false + } + + if ip6net := form.Get("IPv6Net"); ip6net != "" { + _, ipnet, err := net.ParseCIDR(ip6net) + if err != nil { + return nil, errors.New("could not parse IPv6Net") + } + ci.IPv6Net = ipnet + } + + return ci, nil +} diff --git a/service/config.go b/service/config.go new file mode 100644 index 0000000..a158686 --- /dev/null +++ b/service/config.go @@ -0,0 +1,24 @@ +package service + +import "github.com/spf13/viper" + +type config struct { + DNSServer string + DefaultTTL uint32 +} + +var C config + +func init() { + SetConfigDefaults() +} + +func SetConfigDefaults() { + viper.SetDefault("Service.DNS.Server", "10.10.11.254:53") + viper.SetDefault("Service.DNS.DefaultTTL", 60) +} + +func LoadConfig() { + C.DNSServer = viper.GetString("Service.DNS.Server") + C.DefaultTTL = viper.GetUint32("Service.DNS.DefaultTTL") +} diff --git a/service/dns.go b/service/dns.go new file mode 100644 index 0000000..f4185f3 --- /dev/null +++ b/service/dns.go @@ -0,0 +1,79 @@ +package service + +import ( + "fmt" + "log" + "net" + + "github.com/miekg/dns" +) + +var dnsClient dns.Client + +func init() { + dnsClient = dns.Client{ + Net: "tcp", + } +} + +func UpdateDNSEntry(domain string, hostname string, ip4 net.IP, ip6 net.IP) error { + if ip4 == nil && ip6 == nil { + return fmt.Errorf("at least one of --ipv4 and --ipv6 have to be set") + } + + msg := new(dns.Msg) + fqdn := fmt.Sprintf("%s.%s.", hostname, domain) + zone := fmt.Sprintf("%s.", domain) + + msg.SetUpdate(zone) + msg.RemoveName([]dns.RR{ + &dns.RR_Header{Name: fqdn}, + }) + + var rrs []dns.RR + + if ip4 != nil { + ip4bin := ip4.To4() + if ip4bin == nil { + return fmt.Errorf("ip4 (%v) is not a valid IPv4 address", ip4) + } + rrs = append(rrs, &dns.A{ + Hdr: dns.RR_Header{ + Name: fqdn, + Rrtype: dns.TypeA, + Class: dns.ClassINET, + Ttl: C.DefaultTTL, + }, + A: ip4bin, + }) + } + + if ip6 != nil { + ip6bin := ip6.To16() + if ip6bin == nil { + return fmt.Errorf("ip6 (%v) is not a valid IPv6 address", ip4) + } + rrs = append(rrs, &dns.AAAA{ + Hdr: dns.RR_Header{ + Name: fqdn, + Rrtype: dns.TypeAAAA, + Class: dns.ClassINET, + Ttl: C.DefaultTTL, + }, + AAAA: ip6bin, + }) + } + + msg.Insert(rrs) + + log.Printf("Sending DNS Update: %v", msg) + + reply, _, err := dnsClient.Exchange(msg, C.DNSServer) + if err != nil { + return fmt.Errorf("failed to execute DNS Udpate: %v", err) + } + + log.Printf("Received DNS Update Reply: %v", reply) + + return nil +} diff --git a/service/nftables.go b/service/nftables.go new file mode 100644 index 0000000..afd8494 --- /dev/null +++ b/service/nftables.go @@ -0,0 +1,82 @@ +package service + +import ( + "fmt" + "net" + "runtime" + + "github.com/google/nftables" +) + +func UpdateNFTSets(tableName string, set4name string, ip4 net.IP, set6name string, ip6 net.IP) error { + runtime.LockOSThread() + defer runtime.UnlockOSThread() + + conn := &nftables.Conn{} + + tables, err := conn.ListTables() + if err != nil { + return fmt.Errorf("could not list NFT tables: %v", err) + } + + var table *nftables.Table = nil + for _, t := range tables { + if t.Name == tableName { + if table == nil { + table = t + } else { + return fmt.Errorf("found two tables with name %s", tableName) + } + } + } + if table == nil { + return fmt.Errorf("could not find table %s", tableName) + } + + if ip4 != nil { + ip4bin := ip4.To4() + if ip4bin == nil { + return fmt.Errorf("ipv4 must be a valid IPv4 address") + } + + set4, err := conn.GetSetByName(table, set4name) + if err != nil { + return fmt.Errorf("could not find IPv4 NFT set %s: %v", set4name, err) + } + if set4.KeyType.GetNFTMagic() != nftables.TypeIPAddr.GetNFTMagic() { + return fmt.Errorf("the NFT set %s is not of type ip", set4name) + } + + conn.FlushSet(set4) + + err = conn.SetAddElements(set4, []nftables.SetElement{{Key: ip4bin}}) + if err != nil { + return fmt.Errorf("failed to add IP %v to set %s: %v", ip4, set4name, err) + } + } + + if ip6 != nil { + ip6bin := ip6.To16() + if ip6bin == nil { + return fmt.Errorf("ipv6 must be a valid IPv6 address") + } + + set6, err := conn.GetSetByName(table, set6name) + if err != nil { + return fmt.Errorf("could not find IPv6 NFT set %s: %v", set6name, err) + } + if set6.KeyType.GetNFTMagic() != nftables.TypeIP6Addr.GetNFTMagic() { + return fmt.Errorf("the NFT set %s is not of type ip6", set6name) + } + + conn.FlushSet(set6) + + err = conn.SetAddElements(set6, []nftables.SetElement{{Key: ip6bin}}) + if err != nil { + return fmt.Errorf("failed to add IP %v to set %s: %v", ip6, set6name, err) + } + } + + conn.Flush() + return nil +} diff --git a/webapi/config.go b/webapi/config.go new file mode 100644 index 0000000..816384f --- /dev/null +++ b/webapi/config.go @@ -0,0 +1,23 @@ +package webapi + +import ( + "github.com/spf13/viper" +) + +type config struct { + ListenAddress string +} + +var C config + +func init() { + SetConfigDefaults() +} + +func SetConfigDefaults() { + viper.SetDefault("WebAPI.ListenAddress", ":8080") +} + +func LoadConfig() { + C.ListenAddress = viper.GetString("WebAPI.ListenAddress") +} diff --git a/webapi/server.go b/webapi/server.go new file mode 100644 index 0000000..e40bae3 --- /dev/null +++ b/webapi/server.go @@ -0,0 +1,51 @@ +package webapi + +import ( + "fmt" + "log" + "net/http" + + "gitea.nehmer.net/torben/dyndns/service" + "github.com/gorilla/mux" +) + +func Server() { + r := mux.NewRouter() + r.StrictSlash(true) + + r.HandleFunc("/hello", handleHello) + r.HandleFunc("/update", handleDNSUpdate) + + log.Printf("Listening to: %s", C.ListenAddress) + go log.Fatal(http.ListenAndServe(C.ListenAddress, r)) +} + +func handleHello(w http.ResponseWriter, r *http.Request) { + r.ParseForm() + log.Printf("handleHello %s", r.Host) + log.Println(r.URL) + log.Println(r.Form.Get("Lorem")) + log.Println(r.Form) + fmt.Fprint(w, "

Hello World

") +} + +func handleDNSUpdate(w http.ResponseWriter, r *http.Request) { + err := r.ParseForm() + if err != nil { + http.Error(w, err.Error(), http.StatusBadRequest) + return + } + + ci, err := service.CreateClientInfoFromForm(r.Form) + if err != nil { + http.Error(w, err.Error(), http.StatusBadRequest) + return + } + + w.Header().Set("Content-Type", "text/plain") + fmt.Fprintln(w, "OK") + fmt.Fprintln(w, ci) + log.Println(ci) + log.Println(ci.IPv6Net.IP) + log.Println(ci.IPv6Net.Mask) +}