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mirror of https://github.com/cwinfo/yggdrasil-go.git synced 2024-11-09 15:10:27 +00:00

(broken state) more WIP on tuntap stuff

This commit is contained in:
Arceliar 2021-05-08 11:14:50 -05:00
parent 0cff56fcc1
commit 5b22392c66
3 changed files with 96 additions and 2 deletions

View File

@ -1,18 +1,107 @@
package tuntap
import (
//"github.com/yggdrasil-network/yggdrasil-go/src/address"
"crypto/ed25519"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
//"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
//"golang.org/x/net/icmp"
//"golang.org/x/net/ipv6"
iwt "github.com/Arceliar/ironwood/types"
"github.com/Arceliar/phony"
)
const TUN_OFFSET_BYTES = 4
func (tun *TunAdapter) doRead() {
var buf [TUN_OFFSET_BYTES + 65535]byte
for {
n, err := tun.iface.Read(buf[:], TUN_OFFSET_BYTES)
if n <= TUN_OFFSET_BYTES || err != nil {
tun.log.Errorln("Error reading TUN:", err)
ferr := tun.iface.Flush()
if ferr != nil {
tun.log.Errorln("Unable to flush packets:", ferr)
}
return
}
begin := TUN_OFFSET_BYTES
end := begin + n
bs := buf[begin:end]
if bs[0]&0xf0 != 0x60 {
continue // not IPv6
}
if len(bs) < 40 {
tun.log.Traceln("TUN iface read undersized ipv6 packet, length:", len(bs))
continue
}
var srcAddr, dstAddr address.Address
var srcSubnet, dstSubnet address.Subnet
copy(srcAddr[:], bs[8:])
copy(dstAddr[:], bs[24:])
copy(srcSubnet[:], bs[8:])
copy(dstSubnet[:], bs[24:])
if srcAddr != tun.addr && srcSubnet != tun.subnet {
continue // Wrong soruce address
}
if dstAddr.IsValid() {
tun.store.sendToAddress(dstAddr, bs)
} else if dstSubnet.IsValid() {
tun.store.sendToSubnet(dstSubnet, bs)
}
}
}
func (tun *TunAdapter) doWrite() {
panic("TODO")
// Read from the packetconn
// Get the info from the store
// Check if addresses / subnets / etc are OK (both sides of connection)
var buf [TUN_OFFSET_BYTES + 65535]byte
for {
bs := buf[TUN_OFFSET_BYTES:]
n, from, err := tun.core.ReadFrom(bs)
if err != nil {
return
}
bs = bs[:n]
if bs[0]&0xf0 != 0x60 {
continue // not IPv6
}
if len(bs) < 40 {
continue
}
var srcAddr, dstAddr address.Address
var srcSubnet, dstSubnet address.Subnet
copy(srcAddr[:], bs[8:])
copy(dstAddr[:], bs[24:])
copy(srcSubnet[:], bs[8:])
copy(dstSubnet[:], bs[24:])
if dstAddr != tun.addr && dstSubnet != tun.subnet {
continue // bad local address/subnet
}
info := tun.store.update(ed25519.PublicKey(from.(iwt.Addr)))
if srcAddr != info.address && srcSubnet != info.subnet {
continue // bad remote address/subnet
}
bs = buf[:TUN_OFFSET_BYTES+n]
n, err = tun.iface.Write(bs, TUN_OFFSET_BYTES)
if err != nil {
tun.Act(nil, func() {
if !tun.isOpen {
tun.log.Errorln("TUN iface write error:", err)
}
})
}
if n != len(bs) {
// TODO some kind of error reporting for a partial write
}
}
}
type tunWriter struct {
phony.Inbox
tun *TunAdapter

View File

@ -70,6 +70,7 @@ func (k *keyStore) sendToAddress(addr address.Address, bs []byte) {
delete(k.addrBuffer, addr)
}
})
panic("TODO") // TODO send lookup
}
}
@ -97,10 +98,11 @@ func (k *keyStore) sendToSubnet(subnet address.Subnet, bs []byte) {
delete(k.subnetBuffer, subnet)
}
})
panic("TODO") // TODO send lookup
}
}
func (k *keyStore) update(key ed25519.PublicKey) {
func (k *keyStore) update(key ed25519.PublicKey) *keyInfo {
k.mutex.Lock()
defer k.mutex.Unlock()
var kArray keyArray
@ -130,6 +132,7 @@ func (k *keyStore) update(key ed25519.PublicKey) {
}
}
k.resetTimeout(info)
return info
}
func (k *keyStore) resetTimeout(info *keyInfo) {

View File

@ -171,6 +171,8 @@ func (tun *TunAdapter) _start() error {
// TODO go tun.handler()
tun.reader.Act(nil, tun.reader._read) // Start the reader
tun.ckr.init(tun)
go tun.doRead()
go tun.doWrite()
return nil
}