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Copy pathconnect_token_shared.go
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Copy pathconnect_token_shared.go
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152 lines (128 loc) · 3.46 KB
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package netcode
import (
"fmt"
"net"
"strconv"
)
// ip types used in serialization of server addresses
const (
ADDRESS_NONE = iota
ADDRESS_IPV4
ADDRESS_IPV6
)
// This struct contains data that is shared in both public and private parts of the
// connect token.
type sharedTokenData struct {
TimeoutSeconds int32 // timeout in seconds. -1 means disable timeout (dev only).
ServerAddrs []net.UDPAddr // list of server addresses this client may connect to
ClientKey []byte // client to server key
ServerKey []byte // server to client key
}
func (shared *sharedTokenData) GenerateShared() error {
var err error
if shared.ClientKey, err = GenerateKey(); err != nil {
return fmt.Errorf("error generating client key: %s", err)
}
if shared.ServerKey, err = GenerateKey(); err != nil {
return fmt.Errorf("error generating server key: %s", err)
}
return nil
}
// Reads and validates the servers, client <-> server keys.
func (shared *sharedTokenData) ReadShared(buffer *Buffer) error {
var err error
var servers uint32
var ipBytes []byte
shared.TimeoutSeconds, err = buffer.GetInt32()
if err != nil {
return err
}
servers, err = buffer.GetUint32()
if err != nil {
return err
}
if servers <= 0 {
return ErrEmptyServers
}
if servers > MAX_SERVERS_PER_CONNECT {
return ErrTooManyServers
}
shared.ServerAddrs = make([]net.UDPAddr, servers)
for i := 0; i < int(servers); i += 1 {
serverType, err := buffer.GetUint8()
if err != nil {
return err
}
if serverType == ADDRESS_IPV4 {
ipBytes, err = buffer.GetBytes(4)
if err != nil {
return err
}
} else if serverType == ADDRESS_IPV6 {
ipBytes = make([]byte, 16)
for i := 0; i < 16; i += 2 {
n, err := buffer.GetUint16()
if err != nil {
return err
}
// decode little endian -> big endian for net.IP
ipBytes[i] = byte(n >> 8)
ipBytes[i+1] = byte(n)
}
} else {
return ErrUnknownIPAddress
}
ip := net.IP(ipBytes)
port, err := buffer.GetUint16()
if err != nil {
return ErrInvalidPort
}
shared.ServerAddrs[i] = net.UDPAddr{IP: ip, Port: int(port)}
}
if shared.ClientKey, err = buffer.GetBytes(KEY_BYTES); err != nil {
return err
}
if shared.ServerKey, err = buffer.GetBytes(KEY_BYTES); err != nil {
return err
}
return nil
}
// Writes the servers and client <-> server keys to the supplied buffer
func (shared *sharedTokenData) WriteShared(buffer *Buffer) error {
buffer.WriteInt32(shared.TimeoutSeconds)
buffer.WriteUint32(uint32(len(shared.ServerAddrs)))
for _, addr := range shared.ServerAddrs {
host, port, err := net.SplitHostPort(addr.String())
if err != nil {
return fmt.Errorf("invalid port for host: %v", addr)
}
parsed := net.ParseIP(host)
if parsed == nil {
return ErrInvalidIPAddress
}
parsedIpv4 := parsed.To4()
if parsedIpv4 != nil {
buffer.WriteUint8(uint8(ADDRESS_IPV4))
for i := 0; i < len(parsedIpv4); i += 1 {
buffer.WriteUint8(parsedIpv4[i])
}
} else {
buffer.WriteUint8(uint8(ADDRESS_IPV6))
for i := 0; i < len(parsed); i += 2 {
var n uint16
// net.IP is already big endian encoded, encode it to create little endian encoding.
n = uint16(parsed[i]) << 8
n |= uint16(parsed[i+1])
buffer.WriteUint16(n)
}
}
p, err := strconv.ParseUint(port, 10, 16)
if err != nil {
return err
}
buffer.WriteUint16(uint16(p))
}
buffer.WriteBytesN(shared.ClientKey, KEY_BYTES)
buffer.WriteBytesN(shared.ServerKey, KEY_BYTES)
return nil
}