wireguard-go/index.go

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package main
import (
"crypto/rand"
"encoding/binary"
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"sync"
)
/* Index=0 is reserved for unset indecies
*
*/
type IndexTableEntry struct {
peer *Peer
handshake *Handshake
keyPair *KeyPair
}
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type IndexTable struct {
mutex sync.RWMutex
table map[uint32]IndexTableEntry
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}
func randUint32() (uint32, error) {
var buff [4]byte
_, err := rand.Read(buff[:])
value := binary.LittleEndian.Uint32(buff[:])
return value, err
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}
func (table *IndexTable) Init() {
table.mutex.Lock()
table.table = make(map[uint32]IndexTableEntry)
table.mutex.Unlock()
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}
func (table *IndexTable) Delete(index uint32) {
if index == 0 {
return
}
table.mutex.Lock()
delete(table.table, index)
table.mutex.Unlock()
}
func (table *IndexTable) Insert(key uint32, value IndexTableEntry) {
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table.mutex.Lock()
table.table[key] = value
table.mutex.Unlock()
}
func (table *IndexTable) NewIndex(peer *Peer) (uint32, error) {
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for {
// generate random index
index, err := randUint32()
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if err != nil {
return index, err
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}
if index == 0 {
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continue
}
// check if index used
table.mutex.RLock()
_, ok := table.table[index]
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table.mutex.RUnlock()
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if ok {
continue
}
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// map index to handshake
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table.mutex.Lock()
_, found := table.table[index]
if found {
table.mutex.Unlock()
continue
}
table.table[index] = IndexTableEntry{
peer: peer,
handshake: &peer.handshake,
keyPair: nil,
}
table.mutex.Unlock()
return index, nil
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}
}
func (table *IndexTable) Lookup(id uint32) IndexTableEntry {
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table.mutex.RLock()
defer table.mutex.RUnlock()
return table.table[id]
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}