func parseHelloRequest(r *xio.PacketReader) (*helloRequest, error) {
var err error
if _, err = r.Read8(); err != nil {
return nil, errors.New("hello.read ignore")
}
size := uint8(0)
if size, err = r.Read8(); err != nil {
return nil, errors.New("hello.read epd.len")
} else if size <= 1 {
return nil, errors.New("hello.too small epd.len")
} else {
size--
if int(size) > r.Len() {
return nil, errors.New("hello.too big epd.len")
}
}
mode := uint8(0)
if mode, err = r.Read8(); err != nil {
return nil, errors.New("hello.read mode")
}
epd := make([]byte, int(size))
if err = r.ReadBytes(epd); err != nil {
return nil, errors.New("hello.read epd")
}
tag := make([]byte, 16)
if err = r.ReadBytes(tag); err != nil {
return nil, errors.New("hello.read tag")
}
return &helloRequest{epd, tag, mode}, nil
}
func parseAssignRequest(r *xio.PacketReader) (*assignRequest, error) {
var err error
yid := uint32(0)
if yid, err = r.Read32(); err != nil {
return nil, errors.New("assign.read yid")
}
coolen := uint64(0)
if coolen, err = r.Read7BitValue64(); err != nil {
return nil, errors.New("assign.read cookie.len")
} else if coolen != cookies.CookieSize {
return nil, errors.New("assign.bad cookie.len")
}
coobuf := make([]byte, cookies.CookieSize)
if err = r.ReadBytes(coobuf); err != nil {
return nil, errors.New("assign.read cookie.value")
}
size := uint64(0)
if size, err = r.Read7BitValue64(); err != nil {
return nil, errors.New("assign.read pid.size")
} else if size == 0 || size > uint64(r.Len()) {
return nil, errors.New("assign.bad pid.size")
}
pid := sha256.Sum256(r.Bytes()[:size])
if len(pid) != 0x20 {
return nil, errors.New("assign.bad pid.len")
}
if size, err = r.Read7BitValue64(); err != nil {
return nil, errors.New("assign.read pubkey.len")
} else if size <= 2 {
return nil, errors.New("assign.too small pubkey.len")
} else {
size -= 2
if size > uint64(r.Len()) {
return nil, errors.New("assign.too big pubkey.len")
}
if err := r.Skip(2); err != nil {
return nil, errors.New("assign.skip useless")
}
}
pubkey := make([]byte, int(size))
if err = r.ReadBytes(pubkey); err != nil {
return nil, errors.New("assign.read pubkey")
}
if size, err = r.Read7BitValue64(); err != nil {
return nil, errors.New("assign.read initiator.len")
} else if size == 0 || size > uint64(r.Len()) {
return nil, errors.New("assign.bad initiator.len")
}
initiator := make([]byte, int(size))
if err = r.ReadBytes(initiator); err != nil {
return nil, errors.New("assign.read initiator")
}
return &assignRequest{yid, string(pid[:]), coobuf, pubkey, initiator}, nil
}