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// +build gofuzz
package stun
import (
"encoding/binary"
"fmt"
)
var (
m = New()
)
// FuzzMessage is go-fuzz endpoint for message.
func FuzzMessage(data []byte) int {
m.Reset()
// fuzzer dont know about cookies
binary.BigEndian.PutUint32(data[4:8], magicCookie)
// trying to read data as message
if _, err := m.Write(data); err != nil {
return 0
}
m2 := New()
if _, err := m2.Write(m.Raw); err != nil {
panic(err) // nolint
}
if m2.TransactionID != m.TransactionID {
panic("transaction ID mismatch") // nolint
}
if m2.Type != m.Type {
panic("type missmatch") // nolint
}
if len(m2.Attributes) != len(m.Attributes) {
panic("attributes length missmatch") // nolint
}
return 1
}
// FuzzType is go-fuzz endpoint for message type.
func FuzzType(data []byte) int {
t := MessageType{}
vt, _ := binary.Uvarint(data)
v := uint16(vt) & 0x1fff // first 3 bits are empty
t.ReadValue(v)
v2 := t.Value()
if v != v2 {
panic("v != v2") // nolint
}
t2 := MessageType{}
t2.ReadValue(v2)
if t2 != t {
panic("t2 != t") // nolint
}
return 0
}
type attr interface {
Getter
Setter
}
type attrs []struct {
g attr
t AttrType
}
func (a attrs) pick(v byte) struct {
g attr
t AttrType
} {
idx := int(v) % len(a)
return a[idx]
}
func FuzzSetters(data []byte) int {
var (
m1 = &Message{
Raw: make([]byte, 0, 2048),
}
m2 = &Message{
Raw: make([]byte, 0, 2048),
}
m3 = &Message{
Raw: make([]byte, 0, 2048),
}
)
attributes := attrs{
{new(Realm), AttrRealm},
{new(XORMappedAddress), AttrXORMappedAddress},
{new(Nonce), AttrNonce},
{new(Software), AttrSoftware},
{new(AlternateServer), AttrAlternateServer},
{new(ErrorCodeAttribute), AttrErrorCode},
{new(UnknownAttributes), AttrUnknownAttributes},
{new(Username), AttrUsername},
{new(MappedAddress), AttrMappedAddress},
{new(Realm), AttrRealm},
}
var firstByte = byte(0)
if len(data) > 0 {
firstByte = data[0]
}
a := attributes.pick(firstByte)
value := data
if len(data) > 1 {
value = value[1:]
}
m1.WriteHeader()
m1.Add(a.t, value)
err := a.g.GetFrom(m1)
if err == ErrAttributeNotFound {
fmt.Println("unexpected 404") // nolint
panic(err) // nolint
}
if err != nil {
return 1
}
m2.WriteHeader()
if err = a.g.AddTo(m2); err != nil {
// We allow decoding some text attributes
// when their length is too big, but
// not encoding.
if !IsAttrSizeOverflow(err) {
panic(err) // nolint
}
return 1
}
m3.WriteHeader()
v, err := m2.Get(a.t)
if err != nil {
panic(err) // nolint
}
m3.Add(a.t, v)
if !m2.Equal(m3) {
fmt.Println(m2, "not equal", m3) // nolint
panic("not equal") // nolint
}
return 1
}
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