/
comm.go
202 lines (181 loc) · 4.91 KB
/
comm.go
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package advanced_nego
import (
"errors"
"github.com/wlhet/orago/network"
)
type AdvancedNegoComm struct {
session *network.Session
}
func newComm(session *network.Session) *AdvancedNegoComm {
return &AdvancedNegoComm{session: session}
}
func (comm *AdvancedNegoComm) writePacketHeader(length, _type int) {
comm.session.PutInt(length, 2, true, false)
comm.session.PutInt(_type, 2, true, false)
}
func (comm *AdvancedNegoComm) readPacketHeader(_type int) (length int, err error) {
length, err = comm.session.GetInt(2, false, true)
if err != nil {
return
}
receivedType, err := comm.session.GetInt(2, false, true)
if err != nil {
return 0, err
}
if receivedType != _type {
err = errors.New("advanced negotiation error: received type is not as stored type")
return
}
err = comm.validatePacketHeader(length, receivedType)
return
}
func (comm *AdvancedNegoComm) validatePacketHeader(length, _type int) error {
if _type < 0 || _type > 7 {
return errors.New("advanced negotiation error: cannot validate packet header")
}
switch _type {
case 0, 1:
break
case 2:
if length > 1 {
return errors.New("advanced negotiation error: cannot validate packet header")
}
case 3:
fallthrough
case 6:
if length > 2 {
return errors.New("advanced negotiation error: cannot validate packet header")
}
case 4:
fallthrough
case 5:
if length > 4 {
return errors.New("advanced negotiation error: cannot validate packet header")
}
case 7:
if length < 10 {
return errors.New("advanced negotiation error: cannot validate packet header")
}
default:
return errors.New("advanced negotiation error: cannot validate packet header")
}
return nil
}
func (comm *AdvancedNegoComm) readUB1() (number uint8, err error) {
_, err = comm.readPacketHeader(2)
if err != nil {
return
}
number, err = comm.session.GetByte()
return
}
func (comm *AdvancedNegoComm) writeUB1(number uint8) {
comm.writePacketHeader(1, 2)
comm.session.PutBytes(number)
}
func (comm *AdvancedNegoComm) readUB2() (number int, err error) {
_, err = comm.readPacketHeader(3)
number, err = comm.session.GetInt(2, false, true)
return
}
func (comm *AdvancedNegoComm) writeUB2(number int) {
comm.writePacketHeader(2, 3)
comm.session.PutInt(number, 2, true, false)
}
func (comm *AdvancedNegoComm) readUB4() (number int, err error) {
_, err = comm.readPacketHeader(4)
number, err = comm.session.GetInt(4, false, true)
return
}
func (comm *AdvancedNegoComm) writeUB4(number int) {
comm.writePacketHeader(4, 4)
comm.session.PutInt(number, 4, true, false)
}
func (comm *AdvancedNegoComm) readString() (string, error) {
stringLen, err := comm.readPacketHeader(0)
if err != nil {
return "", err
}
resultBytes, err := comm.session.GetBytes(stringLen)
if err != nil {
return "", err
}
return string(resultBytes), nil
}
func (comm *AdvancedNegoComm) writeString(input string) {
comm.writePacketHeader(len(input), 0)
comm.session.PutBytes([]byte(input)...)
}
func (comm *AdvancedNegoComm) writeStatus(status int) {
comm.writePacketHeader(2, 6)
comm.session.PutInt(status, 2, true, false)
}
func (comm *AdvancedNegoComm) readStatus() (status int, err error) {
_, err = comm.readPacketHeader(6)
if err != nil {
return
}
status, err = comm.session.GetInt(2, false, true)
return
}
func (comm *AdvancedNegoComm) readVersion() (uint32, error) {
_, err := comm.readPacketHeader(5)
if err != nil {
return 0, err
}
version, err := comm.session.GetInt(4, false, true)
return uint32(version), err
}
func (comm *AdvancedNegoComm) writeVersion(version uint32) {
comm.writePacketHeader(4, 5)
comm.session.PutInt(version, 4, true, false)
}
func (comm *AdvancedNegoComm) readBytes() ([]byte, error) {
length, err := comm.readPacketHeader(1)
if err != nil {
return nil, err
}
return comm.session.GetBytes(length)
}
func (comm *AdvancedNegoComm) writeBytes(input []byte) {
comm.writePacketHeader(len(input), 1)
comm.session.PutBytes(input...)
}
func (comm *AdvancedNegoComm) readUB2Array() ([]int, error) {
_, err := comm.readPacketHeader(1)
if err != nil {
return nil, err
}
num1, err := comm.session.GetInt64(4, false, true)
if err != nil {
return nil, err
}
num2, err := comm.session.GetInt(2, false, true)
if err != nil {
return nil, err
}
size, err := comm.session.GetInt(4, false, true)
if err != nil {
return nil, err
}
if num1 != 0xDEADBEEF || num2 != 3 {
return nil, errors.New("advanced negotiation error: reading supervisor service")
}
output := make([]int, size)
for i := 0; i < size; i++ {
output[i], err = comm.session.GetInt(2, false, true)
if err != nil {
return nil, err
}
}
return output, nil
}
func (comm *AdvancedNegoComm) writeUB2Array(input []int) {
comm.writePacketHeader(10+len(input)*2, 1)
comm.session.PutInt(uint64(0xDEADBEEF), 4, true, false)
comm.session.PutInt(3, 2, true, false)
comm.session.PutInt(len(input), 4, true, false)
for i := 0; i < len(input); i++ {
comm.session.PutInt(input[i], 2, true, false)
}
}