yggdrasil-network/yggdrasil-go
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Fix adapter setup and no longer panics on packets shorter than IP header

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This commit is contained in:
Neil Alexander 2019-03-28 09:12:00 +00:00
parent 0b494a8255
commit 0715e829c2
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GPG key ID: A02A2019A2BB0944
3 changed files with 18 additions and 7 deletions
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20
src/tuntap/tun.go
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@ -107,13 +107,20 @@ func (tun *TunAdapter) Start(a address.Address, s address.Subnet) error {
}
}
if ifname == "none" || ifname == "dummy" {
tun.log.Debugln("Not starting TUN/TAP as ifname is none or dummy")
return nil
}
tun.mutex.Lock()
tun.isOpen = true
tun.mutex.Unlock()
go func() { tun.log.Errorln("WARNING: tun.read() exited with error:", tun.Read()) }()
go func() { tun.log.Errorln("WARNING: tun.write() exited with error:", tun.Write()) }()
go func() {
tun.log.Debugln("Starting TUN/TAP reader goroutine")
tun.log.Errorln("WARNING: tun.read() exited with error:", tun.Read())
}()
go func() {
tun.log.Debugln("Starting TUN/TAP writer goroutine")
tun.log.Errorln("WARNING: tun.write() exited with error:", tun.Write())
}()
if iftapmode {
go func() {
for {
@ -147,12 +154,16 @@ func (tun *TunAdapter) Write() error {
var destAddr address.Address
if data[0]&0xf0 == 0x60 {
if len(data) < 40 {
panic("Tried to send a packet shorter than an IPv6 header...")
//panic("Tried to send a packet shorter than an IPv6 header...")
util.PutBytes(data)
continue
}
copy(destAddr[:16], data[24:])
} else if data[0]&0xf0 == 0x40 {
if len(data) < 20 {
panic("Tried to send a packet shorter than an IPv4 header...")
//panic("Tried to send a packet shorter than an IPv4 header...")
util.PutBytes(data)
continue
}
copy(destAddr[:4], data[16:])
} else {
@ -255,7 +266,6 @@ func (tun *TunAdapter) Read() error {
if !open {
return nil
} else {
// panic(err)
return err
}
}