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package obfsvpn
import (
"context"
"net"
"strconv"
pt "git.torproject.org/pluggable-transports/goptlib.git"
"gitlab.com/yawning/obfs4.git/common/ntor"
"gitlab.com/yawning/obfs4.git/transports/base"
"gitlab.com/yawning/obfs4.git/transports/obfs4"
)
// IATMode determines the amount of time sent between packets.
type IATMode int
// Valid IAT modes.
const (
IATNone IATMode = iota
IATEnabled
IATParanoid
)
// Dialer contains options for connecting to an address and obfuscating traffic
// with the obfs4 protocol.
// It performs the ntor handshake on all dialed connections.
type Dialer struct {
Dialer net.Dialer
NodeID *ntor.NodeID
PublicKey *ntor.PublicKey
IATMode IATMode
cf base.ClientFactory
}
// Dial creates an outbound net.Conn and performs the ntor handshake.
func (d *Dialer) Dial(ctx context.Context, network, address string) (net.Conn, error) {
if d.cf == nil {
cf, err := (&obfs4.Transport{}).ClientFactory("")
if err != nil {
return nil, err
}
d.cf = cf
}
ptArgs := make(pt.Args)
ptArgs.Add("node-id", d.NodeID.Hex())
ptArgs.Add("public-key", d.PublicKey.Hex())
ptArgs.Add("iat-mode", strconv.Itoa(int(d.IATMode)))
args, err := d.cf.ParseArgs(&ptArgs)
if err != nil {
return nil, err
}
return d.cf.Dial(network, address, func(network, address string) (net.Conn, error) {
return d.Dialer.DialContext(ctx, network, address)
}, args)
}
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