mirror of
https://github.com/yggdrasil-network/yggdrasil-go.git
synced 2025-04-28 22:25:07 +03:00
(broken state) WIP on tuntap
This commit is contained in:
Arceliar
parent
f1c37f8440
commit
0cff56fcc1
6 changed files with 524 additions and 547 deletions
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@ -1,12 +1,12 @@
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package tuntap
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import (
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"github.com/yggdrasil-network/yggdrasil-go/src/address"
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//"github.com/yggdrasil-network/yggdrasil-go/src/address"
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"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
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"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
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//"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
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"golang.org/x/net/icmp"
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"golang.org/x/net/ipv6"
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//"golang.org/x/net/icmp"
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//"golang.org/x/net/ipv6"
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"github.com/Arceliar/phony"
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)
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@ -84,139 +84,142 @@ func (tun *TunAdapter) handlePacketFrom(from phony.Actor, packet []byte, err err
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// does the work of reading a packet and sending it to the correct tunConn
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func (tun *TunAdapter) _handlePacket(recvd []byte, err error) {
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if err != nil {
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tun.log.Errorln("TUN iface read error:", err)
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return
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}
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// Offset the buffer from now on so that we can ignore ethernet frames if
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// they are present
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bs := recvd[:]
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// Check if the packet is long enough to detect if it's an ICMP packet or not
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if len(bs) < 7 {
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tun.log.Traceln("TUN iface read undersized unknown packet, length:", len(bs))
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return
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}
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// From the IP header, work out what our source and destination addresses
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// and node IDs are. We will need these in order to work out where to send
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// the packet
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var dstAddr address.Address
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var dstSnet address.Subnet
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var addrlen int
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n := len(bs)
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// Check the IP protocol - if it doesn't match then we drop the packet and
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// do nothing with it
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if bs[0]&0xf0 == 0x60 {
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// Check if we have a fully-sized IPv6 header
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if len(bs) < 40 {
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tun.log.Traceln("TUN iface read undersized ipv6 packet, length:", len(bs))
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panic("TODO")
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/*
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if err != nil {
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tun.log.Errorln("TUN iface read error:", err)
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return
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}
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// Check the packet size
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if n-tun_IPv6_HEADER_LENGTH != 256*int(bs[4])+int(bs[5]) {
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// Offset the buffer from now on so that we can ignore ethernet frames if
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// they are present
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bs := recvd[:]
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// Check if the packet is long enough to detect if it's an ICMP packet or not
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if len(bs) < 7 {
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tun.log.Traceln("TUN iface read undersized unknown packet, length:", len(bs))
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return
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}
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// IPv6 address
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addrlen = 16
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copy(dstAddr[:addrlen], bs[24:])
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copy(dstSnet[:addrlen/2], bs[24:])
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} else if bs[0]&0xf0 == 0x40 {
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// Check if we have a fully-sized IPv4 header
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if len(bs) < 20 {
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tun.log.Traceln("TUN iface read undersized ipv4 packet, length:", len(bs))
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// From the IP header, work out what our source and destination addresses
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// and node IDs are. We will need these in order to work out where to send
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// the packet
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var dstAddr address.Address
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var dstSnet address.Subnet
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var addrlen int
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n := len(bs)
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// Check the IP protocol - if it doesn't match then we drop the packet and
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// do nothing with it
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if bs[0]&0xf0 == 0x60 {
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// Check if we have a fully-sized IPv6 header
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if len(bs) < 40 {
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tun.log.Traceln("TUN iface read undersized ipv6 packet, length:", len(bs))
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return
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}
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// Check the packet size
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if n-tun_IPv6_HEADER_LENGTH != 256*int(bs[4])+int(bs[5]) {
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return
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}
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// IPv6 address
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addrlen = 16
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copy(dstAddr[:addrlen], bs[24:])
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copy(dstSnet[:addrlen/2], bs[24:])
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} else if bs[0]&0xf0 == 0x40 {
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// Check if we have a fully-sized IPv4 header
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if len(bs) < 20 {
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tun.log.Traceln("TUN iface read undersized ipv4 packet, length:", len(bs))
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return
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}
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// Check the packet size
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if n != 256*int(bs[2])+int(bs[3]) {
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return
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}
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// IPv4 address
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addrlen = 4
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copy(dstAddr[:addrlen], bs[16:])
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} else {
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// Unknown address length or protocol, so drop the packet and ignore it
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tun.log.Traceln("Unknown packet type, dropping")
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return
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}
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// Check the packet size
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if n != 256*int(bs[2])+int(bs[3]) {
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return
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if tun.ckr.isEnabled() {
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if addrlen != 16 || (!dstAddr.IsValid() && !dstSnet.IsValid()) {
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if key, err := tun.ckr.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
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// A public key was found, get the node ID for the search
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panic("TODO")
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//dstNodeID := crypto.GetNodeID(&key)
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//dstAddr = *address.AddrForNodeID(dstNodeID)
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//dstSnet = *address.SubnetForNodeID(dstNodeID)
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addrlen = 16
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}
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}
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}
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// IPv4 address
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addrlen = 4
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copy(dstAddr[:addrlen], bs[16:])
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} else {
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// Unknown address length or protocol, so drop the packet and ignore it
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tun.log.Traceln("Unknown packet type, dropping")
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return
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}
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if tun.ckr.isEnabled() {
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if addrlen != 16 || (!dstAddr.IsValid() && !dstSnet.IsValid()) {
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if /*key*/ _, err := tun.ckr.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
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// A public key was found, get the node ID for the search
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panic("TODO")
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//dstNodeID := crypto.GetNodeID(&key)
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//dstAddr = *address.AddrForNodeID(dstNodeID)
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//dstSnet = *address.SubnetForNodeID(dstNodeID)
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addrlen = 16
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// Couldn't find this node's ygg IP
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dlen := len(bs)
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if dlen > 900 {
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dlen = 900
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}
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ptb := &icmp.DstUnreach{
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Data: bs[:dlen],
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}
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if packet, err := CreateICMPv6(bs[8:24], bs[24:40], ipv6.ICMPTypeDestinationUnreachable, 0, ptb); err == nil {
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tun.writer.writeFrom(nil, packet)
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}
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return
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}
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}
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if addrlen != 16 || (!dstAddr.IsValid() && !dstSnet.IsValid()) {
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// Couldn't find this node's ygg IP
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dlen := len(bs)
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if dlen > 900 {
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dlen = 900
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}
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ptb := &icmp.DstUnreach{
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Data: bs[:dlen],
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}
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if packet, err := CreateICMPv6(bs[8:24], bs[24:40], ipv6.ICMPTypeDestinationUnreachable, 0, ptb); err == nil {
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tun.writer.writeFrom(nil, packet)
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}
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return
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}
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// Do we have an active connection for this node address?
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var dstString string
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session, isIn := tun.addrToConn[dstAddr]
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if !isIn || session == nil {
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session, isIn = tun.subnetToConn[dstSnet]
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// Do we have an active connection for this node address?
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var dstString string
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session, isIn := tun.addrToConn[dstAddr]
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if !isIn || session == nil {
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// Neither an address nor a subnet mapping matched, therefore populate
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// the node ID and mask to commence a search
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panic("TODO")
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if dstAddr.IsValid() {
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//dstString = dstAddr.GetNodeIDLengthString()
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} else {
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//dstString = dstSnet.GetNodeIDLengthString()
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session, isIn = tun.subnetToConn[dstSnet]
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if !isIn || session == nil {
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// Neither an address nor a subnet mapping matched, therefore populate
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// the node ID and mask to commence a search
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panic("TODO")
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if dstAddr.IsValid() {
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//dstString = dstAddr.GetNodeIDLengthString()
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} else {
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//dstString = dstSnet.GetNodeIDLengthString()
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}
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}
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}
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}
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// If we don't have a connection then we should open one
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if !isIn || session == nil {
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// Check we haven't been given empty node ID, really this shouldn't ever
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// happen but just to be sure...
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if dstString == "" {
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panic("Given empty dstString - this shouldn't happen")
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// If we don't have a connection then we should open one
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if !isIn || session == nil {
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// Check we haven't been given empty node ID, really this shouldn't ever
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// happen but just to be sure...
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if dstString == "" {
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panic("Given empty dstString - this shouldn't happen")
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}
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_, known := tun.dials[dstString]
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tun.dials[dstString] = append(tun.dials[dstString], bs)
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for len(tun.dials[dstString]) > 32 {
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tun.dials[dstString] = tun.dials[dstString][1:]
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}
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if !known {
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go func() {
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conn, err := tun.dialer.Dial("nodeid", dstString)
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tun.Act(nil, func() {
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packets := tun.dials[dstString]
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delete(tun.dials, dstString)
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if err != nil {
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return
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}
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// We've been given a connection so prepare the session wrapper
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var tc *tunConn
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if tc, err = tun._wrap(conn.(*yggdrasil.Conn)); err != nil {
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// Something went wrong when storing the connection, typically that
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// something already exists for this address or subnet
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tun.log.Debugln("TUN iface wrap:", err)
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return
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}
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for _, packet := range packets {
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tc.writeFrom(nil, packet)
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}
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})
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}()
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}
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}
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_, known := tun.dials[dstString]
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tun.dials[dstString] = append(tun.dials[dstString], bs)
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for len(tun.dials[dstString]) > 32 {
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tun.dials[dstString] = tun.dials[dstString][1:]
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// If we have a connection now, try writing to it
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if isIn && session != nil {
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session.writeFrom(tun, bs)
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}
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if !known {
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go func() {
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conn, err := tun.dialer.Dial("nodeid", dstString)
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tun.Act(nil, func() {
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packets := tun.dials[dstString]
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delete(tun.dials, dstString)
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if err != nil {
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return
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}
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// We've been given a connection so prepare the session wrapper
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var tc *tunConn
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if tc, err = tun._wrap(conn.(*yggdrasil.Conn)); err != nil {
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// Something went wrong when storing the connection, typically that
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// something already exists for this address or subnet
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tun.log.Debugln("TUN iface wrap:", err)
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return
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}
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for _, packet := range packets {
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tc.writeFrom(nil, packet)
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}
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})
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}()
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}
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}
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// If we have a connection now, try writing to it
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if isIn && session != nil {
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session.writeFrom(tun, bs)
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}
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*/
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}
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