307 lines
8.1 KiB
Go
307 lines
8.1 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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//"os"
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//"path/filepath"
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"strconv"
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"strings"
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)
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import (
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"github.com/eyedeekay/sam-forwarder/i2pkeys"
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"github.com/eyedeekay/sam3"
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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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SamHost string
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SamPort string
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TunName string
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Type string
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TargetHost string
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TargetPort string
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samConn *sam3.SAM
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SamKeys sam3.I2PKeys
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publishConnection *sam3.DatagramSession
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clientConnection net.PacketConn
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FilePath string
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file io.ReadWriter
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save bool
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// samcatd options
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passfile string
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// I2CP options
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encryptLeaseSet string
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leaseSetKey string
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leaseSetPrivateKey string
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leaseSetPrivateSigningKey string
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inAllowZeroHop string
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outAllowZeroHop string
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inLength string
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outLength string
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inQuantity string
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outQuantity string
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inVariance string
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outVariance string
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inBackupQuantity string
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outBackupQuantity string
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fastRecieve string
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useCompression string
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messageReliability string
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closeIdle string
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closeIdleTime string
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reduceIdle string
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reduceIdleTime string
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reduceIdleQuantity string
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//Streaming Library options
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accessListType string
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accessList []string
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}
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var err error
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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) 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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}
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func (f SAMSSUForwarder) Print() string {
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var r string
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r += "name=" + f.TunName + "\n"
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r += "type=" + f.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.accessListType == "whitelist" {
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return "i2cp.enableAccessList=true"
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} else if f.accessListType == "blacklist" {
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return "i2cp.enableBlackList=true"
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} else if f.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.accessListType != "" && len(f.accessList) > 0 {
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r := ""
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for _, s := range f.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.leaseSetKey != "" {
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r = "i2cp.leaseSetKey=" + f.leaseSetKey
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}
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if f.leaseSetPrivateKey != "" {
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s = "i2cp.leaseSetPrivateKey=" + f.leaseSetPrivateKey
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}
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if f.leaseSetPrivateSigningKey != "" {
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t = "i2cp.leaseSetPrivateSigningKey=" + f.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.TargetHost + ":" + f.TargetPort
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}
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func (f SAMSSUForwarder) sam() string {
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return f.SamHost + ":" + f.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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go func() {
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defer f.clientConnection.Close()
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defer f.publishConnection.Close()
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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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}
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}
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}()
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go func() {
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defer f.clientConnection.Close()
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defer f.publishConnection.Close()
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buffer := make([]byte, 1024)
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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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}
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}
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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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//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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//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.SamPort)
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if f.publishConnection, err = f.samConn.NewDatagramSession(f.TunName, f.SamKeys,
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f.print(), sp); 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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b := string(f.SamKeys.Addr().Base32())
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log.Println("SAM Keys loaded,", b)
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p, _ := strconv.Atoi(f.TargetPort)
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f.clientConnection, err = net.DialUDP("udp", nil, &net.UDPAddr{
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Port: p,
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IP: net.ParseIP(f.TargetHost),
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})
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if err != nil {
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log.Fatalf("Dial failed: %v", err)
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}
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log.Printf("Connected to localhost %v\n", f.publishConnection)
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for {
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f.forward()
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}
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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.SamHost = "127.0.0.1"
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s.SamPort = "7656"
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s.FilePath = ""
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s.save = false
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s.TargetHost = "127.0.0.1"
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s.TargetPort = "8081"
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s.TunName = "samSSUForwarder"
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s.inLength = "3"
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s.outLength = "3"
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s.inQuantity = "2"
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s.outQuantity = "2"
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s.inVariance = "1"
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s.outVariance = "1"
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s.inBackupQuantity = "3"
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s.outBackupQuantity = "3"
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s.inAllowZeroHop = "false"
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s.outAllowZeroHop = "false"
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s.fastRecieve = "false"
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s.useCompression = "true"
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s.encryptLeaseSet = "false"
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s.leaseSetKey = ""
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s.leaseSetPrivateKey = ""
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s.leaseSetPrivateSigningKey = ""
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s.reduceIdle = "false"
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s.reduceIdleTime = "300000"
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s.closeIdle = "false"
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s.closeIdleTime = "300000"
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s.reduceIdleQuantity = "4"
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s.Type = "udpserver"
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s.messageReliability = "none"
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s.passfile = ""
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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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if s.samConn, err = sam3.NewSAM(s.sam()); 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.save {
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log.Println("Saving i2p keys")
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}
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if s.SamKeys, err = i2pkeys.Load(s.FilePath, s.TunName, s.passfile, s.samConn); 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.TunName)
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if s.save {
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if err := i2pkeys.Save(s.FilePath, s.TunName, s.passfile, 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.TunName)
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}
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return &s, nil
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}
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