idk/go-i2p
1
0
Fork 0
mirror of https://github.com/go-i2p/go-i2p.git synced 2025-07-04 13:32:52 -04:00
Code Issues Packages Projects Releases Wiki Activity

constants

Browse Source
This commit is contained in:
Hayden Parker
2016-12-29 15:46:25 +00:00
parent c501cb0c65
commit 22356f8a3a
2 changed files with 30 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
lib/tunnel/delivery.go
View File

@ -135,6 +135,16 @@ const (
FOLLOW_ON_FRAGMENT
)
const (
FLAG_SIZE = 1
TUNNEL_ID_SIZE = 4
HASH_SIZE = 32
DELAY_SIZE = 1
MESSAGE_ID_SIZE = 4
EXTENDED_OPTIONS_MIN_SIZE = 2
SIZE_FIELD_SIZE = 2
)
type DelayFactor byte
type DeliveryInstructions []byte
@ -298,9 +308,9 @@ func (delivery_instructions DeliveryInstructions) HasHash() (bool, error) {
return false, err
}
if di_type == DT_TUNNEL || di_type == DT_ROUTER {
min_size := 33
min_size := FLAG_SIZE + HASH_SIZE
if di_type == DT_TUNNEL {
min_size += 4
min_size += TUNNEL_ID_SIZE
}
if len(delivery_instructions) < min_size {
return false, errors.New("Delivery Instructions indicates hash present but has too little data")
@ -319,8 +329,8 @@ func (delivery_instructions DeliveryInstructions) TunnelID() (tunnel_id uint32,
return
}
if has_tunnel_id {
if len(delivery_instructions) >= 5 {
tunnel_id = binary.BigEndian.Uint32(delivery_instructions[1:5])
if len(delivery_instructions) >= FLAG_SIZE+TUNNEL_ID_SIZE {
tunnel_id = binary.BigEndian.Uint32(delivery_instructions[FLAG_SIZE:TUNNEL_ID_SIZE])
} else {
err = errors.New("DeliveryInstructions are invalid, too little data for Tunnel ID")
}
@ -338,12 +348,11 @@ func (delivery_instructions DeliveryInstructions) Hash() (hash common.Hash, err
if err != nil {
return
}
hash_start := 1
hash_end := 33
hash_start := FLAG_SIZE
hash_end := FLAG_SIZE + HASH_SIZE
if delivery_type == DT_TUNNEL {
// add 4 bytes for DT_TUNNEL's TunnelID
hash_start := hash_start + 4
hash_end := hash_end + 4
hash_start := hash_start + TUNNEL_ID_SIZE
hash_end := hash_end + TUNNEL_ID_SIZE
if len(delivery_instructions) >= hash_end {
copy(hash[:], delivery_instructions[hash_start:hash_end])
} else {
@ -374,15 +383,15 @@ func (delivery_instructions DeliveryInstructions) Delay() (delay_factor DelayFac
return
}
if di_type == DT_TUNNEL {
if len(delivery_instructions) >= 37 {
delay_factor = DelayFactor(delivery_instructions[37])
if len(delivery_instructions) >= FLAG_SIZE+TUNNEL_ID_SIZE+HASH_SIZE {
delay_factor = DelayFactor(delivery_instructions[FLAG_SIZE+TUNNEL_ID_SIZE+HASH_SIZE])
} else {
err = errors.New("DeliveryInstructions is invalid, does not contain enough data for DelayFactor")
return
}
} else if di_type == DT_ROUTER {
if len(delivery_instructions) >= 36 {
delay_factor = DelayFactor(delivery_instructions[36])
if len(delivery_instructions) >= FLAG_SIZE+HASH_SIZE {
delay_factor = DelayFactor(delivery_instructions[FLAG_SIZE+HASH_SIZE])
} else {
err = errors.New("DeliveryInstructions is invalid, does not contain enough data for DelayFactor")
return

11
lib/tunnel/delivery_test.go
View File

@ -30,17 +30,20 @@ func validFirstFragmentDeliveryInstructions() []byte {
FirstFragment: true,
Type: 0x02,
Delay: false,
}.FlagByte()
data = append(data, flag)
}
data = append(data, flag.FlagByte())
tunnel_id := []byte{0x00, 0x00, 0x00, 0x01}
data = append(data, tunnel_id...)
hash := make([]byte, 32)
hash := make([]byte, HASH_SIZE)
data = append(data, hash...)
// Add 0 delay
if flag.Delay {
data = append(data, 1)
} else {
data = append(data, 0)
}
message_id := []byte{0x00, 0x00, 0x00, 0x02}
data = append(data, message_id...)