320 lines
8.7 KiB
Go
320 lines
8.7 KiB
Go
package samforwarderudp
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import (
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"io"
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"log"
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"net"
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"strconv"
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"strings"
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"time"
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)
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import (
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"github.com/eyedeekay/sam-forwarder/config"
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"github.com/eyedeekay/sam-forwarder/hashhash"
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"github.com/eyedeekay/sam-forwarder/i2pkeys"
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"github.com/eyedeekay/sam-forwarder/interface"
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"github.com/eyedeekay/sam3"
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"github.com/eyedeekay/sam3/i2pkeys"
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)
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//SAMSSUForwarder is a structure which automatically configured the forwarding of
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//a local service to i2p over the SAM API.
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type SAMSSUForwarder struct {
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samConn *sam3.SAM
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SamKeys i2pkeys.I2PKeys
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Hasher *hashhash.Hasher
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publishConnection *sam3.DatagramSession
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clientConnection net.PacketConn
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file io.ReadWriter
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up bool
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// config
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Conf *i2ptunconf.Conf
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}
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var err error
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func (f *SAMSSUForwarder) Config() *i2ptunconf.Conf {
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return f.Conf
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}
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func (f *SAMSSUForwarder) GetType() string {
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return f.Config().Type
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}
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func (f *SAMSSUForwarder) ID() string {
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return f.Config().TunName
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}
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func (f *SAMSSUForwarder) Keys() i2pkeys.I2PKeys {
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return f.SamKeys
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}
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func (f *SAMSSUForwarder) Cleanup() {
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f.publishConnection.Close()
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f.clientConnection.Close()
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f.samConn.Close()
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}
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func (f *SAMSSUForwarder) Close() error {
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return nil
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}
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func (f *SAMSSUForwarder) print() []string {
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/*lsk, lspk, lspsk := f.leasesetsettings()
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return []string{
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//f.targetForPort443(),
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"inbound.length=" + f.inLength,
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"outbound.length=" + f.outLength,
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"inbound.lengthVariance=" + f.inVariance,
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"outbound.lengthVariance=" + f.outVariance,
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"inbound.backupQuantity=" + f.inBackupQuantity,
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"outbound.backupQuantity=" + f.outBackupQuantity,
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"inbound.quantity=" + f.inQuantity,
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"outbound.quantity=" + f.outQuantity,
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"inbound.allowZeroHop=" + f.inAllowZeroHop,
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"outbound.allowZeroHop=" + f.outAllowZeroHop,
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"i2cp.fastRecieve=" + f.fastRecieve,
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"i2cp.gzip=" + f.useCompression,
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"i2cp.reduceOnIdle=" + f.reduceIdle,
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"i2cp.reduceIdleTime=" + f.reduceIdleTime,
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"i2cp.reduceQuantity=" + f.reduceIdleQuantity,
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"i2cp.closeOnIdle=" + f.closeIdle,
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"i2cp.closeIdleTime=" + f.closeIdleTime,
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"i2cp.messageReliability=" + f.messageReliability,
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"i2cp.encryptLeaseSet=" + f.encryptLeaseSet,
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lsk, lspk, lspsk,
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f.accesslisttype(),
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f.accesslist(),
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}*/
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return f.Config().PrintSlice()
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}
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func (f *SAMSSUForwarder) Props() map[string]string {
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r := make(map[string]string)
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print := f.print()
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print = append(print, "base32="+f.Base32())
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print = append(print, "base64="+f.Base64())
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print = append(print, "base32words="+f.Base32Readable())
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for _, prop := range print {
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k, v := sfi2pkeys.Prop(prop)
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r[k] = v
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}
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return r
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}
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func (f *SAMSSUForwarder) Print() string {
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var r string
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r += "name=" + f.Config().TunName + "\n"
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r += "type=" + f.Config().Type + "\n"
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r += "base32=" + f.Base32() + "\n"
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r += "base64=" + f.Base64() + "\n"
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r += "ssuserver\n"
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for _, s := range f.print() {
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r += s + "\n"
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}
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return strings.Replace(r, "\n\n", "\n", -1)
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}
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func (f *SAMSSUForwarder) Search(search string) string {
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terms := strings.Split(search, ",")
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if search == "" {
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return f.Print()
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}
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for _, value := range terms {
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if !strings.Contains(f.Print(), value) {
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return ""
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}
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}
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return f.Print()
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}
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func (f *SAMSSUForwarder) accesslisttype() string {
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if f.Config().AccessListType == "whitelist" {
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return "i2cp.enableAccessList=true"
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} else if f.Config().AccessListType == "blacklist" {
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return "i2cp.enableBlackList=true"
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} else if f.Config().AccessListType == "none" {
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return ""
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}
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return ""
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}
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func (f *SAMSSUForwarder) accesslist() string {
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if f.Config().AccessListType != "" && len(f.Config().AccessList) > 0 {
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r := ""
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for _, s := range f.Config().AccessList {
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r += s + ","
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}
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return "i2cp.accessList=" + strings.TrimSuffix(r, ",")
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}
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return ""
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}
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func (f *SAMSSUForwarder) leasesetsettings() (string, string, string) {
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var r, s, t string
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if f.Config().LeaseSetKey != "" {
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r = "i2cp.leaseSetKey=" + f.Config().LeaseSetKey
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}
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if f.Config().LeaseSetPrivateKey != "" {
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s = "i2cp.leaseSetPrivateKey=" + f.Config().LeaseSetPrivateKey
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}
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if f.Config().LeaseSetPrivateSigningKey != "" {
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t = "i2cp.leaseSetPrivateSigningKey=" + f.Config().LeaseSetPrivateSigningKey
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}
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return r, s, t
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}
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// Target returns the host:port of the local service you want to forward to i2p
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func (f *SAMSSUForwarder) Target() string {
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return f.Config().TargetHost + ":" + f.Config().TargetPort
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}
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func (f *SAMSSUForwarder) sam() string {
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return f.Config().SamHost + ":" + f.Config().SamPort
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}
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//func (f *SAMSSUForwarder) forward(conn net.Conn) {
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func (f *SAMSSUForwarder) forward() {
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Loop := false
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if f.clientConnection == nil {
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for !Loop {
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log.Println("Attempting to resolve local UDP Service to forward to I2P", f.Config().Target())
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addr, err := net.ResolveUDPAddr("udp", f.Config().Target())
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Loop = f.errSleep(err)
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log.Println("Attempting to dial resolved UDP Address", f.Config().Target())
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f.clientConnection, err = net.DialUDP("udp", nil, addr)
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Loop = f.errSleep(err)
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log.Printf("Connected %v to localhost %v\n", f.publishConnection, f.clientConnection)
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}
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}
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buffer := make([]byte, 1024)
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if size, addr, readerr := f.clientConnection.ReadFrom(buffer); readerr == nil {
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if size2, writeerr := f.publishConnection.WriteTo(buffer, addr); writeerr == nil {
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log.Printf("%q of %q bytes read", size, size2)
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log.Printf("%q of %q bytes written", size2, size)
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} else {
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log.Println(writeerr)
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}
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} else {
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log.Println(readerr)
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}
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if size, addr, readerr := f.publishConnection.ReadFrom(buffer); readerr == nil {
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if size2, writeerr := f.clientConnection.WriteTo(buffer, addr); writeerr == nil {
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log.Printf("%q of %q bytes read", size, size2)
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log.Printf("%q of %q bytes written", size2, size)
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} else {
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log.Println(writeerr)
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}
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} else {
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log.Println(readerr)
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}
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}
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//Base32 returns the base32 address where the local service is being forwarded
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func (f *SAMSSUForwarder) Base32() string {
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return f.SamKeys.Addr().Base32()
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}
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//Base32Readable returns the base32 address where the local service is being forwarded
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func (f *SAMSSUForwarder) Base32Readable() string {
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b32 := strings.Replace(f.Base32(), ".b32.i2p", "", 1)
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rhash, _ := f.Hasher.Friendly(b32)
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return rhash + " " + strconv.Itoa(len(b32))
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}
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//Base64 returns the base64 address where the local service is being forwarded
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func (f *SAMSSUForwarder) Base64() string {
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return f.SamKeys.Addr().Base64()
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}
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func (f *SAMSSUForwarder) errSleep(err error) bool {
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if err != nil {
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log.Printf("Dial failed: %v, waiting 5 minutes to try again\n", err)
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time.Sleep(5 * time.Minute)
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return false
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} else {
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return true
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}
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}
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//Serve starts the SAM connection and and forwards the local host:port to i2p
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func (f *SAMSSUForwarder) Serve() error {
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var err error
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sp, _ := strconv.Atoi(f.Config().SamPort)
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f.publishConnection, err = f.samConn.NewDatagramSession(
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f.Config().TunName,
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f.SamKeys,
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f.print(),
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sp-1,
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)
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if err != nil {
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log.Println("Session Creation error:", err.Error())
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return err
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}
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log.Println("SAM datagram session established.")
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log.Println("Starting Forwarder.")
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log.Println("SAM Keys loaded,", f.Base32())
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log.Println("Human-readable hash:\n ", f.Base32Readable())
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for {
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f.forward()
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}
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}
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func (s *SAMSSUForwarder) Load() (samtunnel.SAMTunnel, error) {
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s.samConn, err = sam3.NewSAM(s.sam())
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if err != nil {
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return nil, err
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}
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log.Println("SAM Bridge connection established.")
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if s.Config().SaveFile {
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log.Println("Saving i2p keys")
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}
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if s.SamKeys, err = sfi2pkeys.Load(s.Config().FilePath, s.Config().TunName, s.Config().KeyFilePath, s.samConn, s.Config().SaveFile); err != nil {
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return nil, err
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}
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log.Println("Destination keys generated, tunnel name:", s.Config().TunName)
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if s.Config().SaveFile {
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if err := sfi2pkeys.Save(s.Config().FilePath, s.Config().TunName, s.Config().KeyFilePath, s.SamKeys); err != nil {
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return nil, err
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}
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log.Println("Saved tunnel keys for", s.Config().TunName)
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}
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s.Hasher, err = hashhash.NewHasher(len(strings.Replace(s.Base32(), ".b32.i2p", "", 1)))
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if err != nil {
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return nil, err
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}
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s.up = true
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return s, nil
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}
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func (f *SAMSSUForwarder) Up() bool {
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return f.up
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}
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//NewSAMSSUForwarder makes a new SAM forwarder with default options, accepts host:port arguments
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func NewSAMSSUForwarder(host, port string) (*SAMSSUForwarder, error) {
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return NewSAMSSUForwarderFromOptions(SetHost(host), SetPort(port))
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}
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//NewSAMSSUForwarderFromOptions makes a new SAM forwarder with default options, accepts host:port arguments
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func NewSAMSSUForwarderFromOptions(opts ...func(*SAMSSUForwarder) error) (*SAMSSUForwarder, error) {
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var s SAMSSUForwarder
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s.Conf = i2ptunconf.NewI2PBlankTunConf()
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s.Conf.Type = "udpserver"
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for _, o := range opts {
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if err := o(&s); err != nil {
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return nil, err
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}
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}
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l, e := s.Load()
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if e != nil {
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return nil, e
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}
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return l.(*SAMSSUForwarder), nil
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}
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