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fix: panic in ssr packet

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This commit is contained in:
wwqgtxx 2025-04-16 22:22:56 +08:00
parent d0d0c392d7
commit b21b8ee046
1 changed files with 14 additions and 2 deletions
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16
transport/shadowsocks/shadowstream/packet.go
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@ -29,6 +29,18 @@ func Pack(dst, plaintext []byte, s Cipher) ([]byte, error) {
return dst[:len(iv)+len(plaintext)], nil
}
// UnpackInplace decrypts pkt using stream cipher s.
// Returns a slice of pkt containing decrypted plaintext.
// Note: The data in the input dst will be changed
func UnpackInplace(pkt []byte, s Cipher) ([]byte, error) {
if len(pkt) < s.IVSize() {
return nil, ErrShortPacket
}
iv, dst := pkt[:s.IVSize()], pkt[s.IVSize():]
s.Decrypter(iv).XORKeyStream(dst, dst)
return dst, nil
}
// Unpack decrypts pkt using stream cipher s.
// Returns a slice of dst containing decrypted plaintext.
func Unpack(dst, pkt []byte, s Cipher) ([]byte, error) {
@ -71,7 +83,7 @@ func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
if err != nil {
return n, addr, err
}
bb, err := Unpack(b[c.IVSize():], b[:n], c.Cipher)
bb, err := UnpackInplace(b[:n], c.Cipher)
if err != nil {
return n, addr, err
}
@ -84,7 +96,7 @@ func (c *PacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, err
if err != nil {
return
}
data, err = Unpack(data[c.IVSize():], data, c)
data, err = UnpackInplace(data, c.Cipher)
if err != nil {
if put != nil {
put()