package net import ( "strconv" "v2ray.com/core/common/errors" "v2ray.com/core/common/serial" ) var ( // ErrInvalidPortRage indicates an error during port range parsing. ErrInvalidPortRange = errors.New("Invalid port range.") ) // Port represents a network port in TCP and UDP protocol. type Port uint16 // PortFromBytes converts a byte array to a Port, assuming bytes are in big endian order. // @unsafe Caller must ensure that the byte array has at least 2 elements. func PortFromBytes(port []byte) Port { return Port(serial.BytesToUint16(port)) } // PortFromInt converts an integer to a Port. // @error when the integer is not positive or larger then 65535 func PortFromInt(val uint32) (Port, error) { if val > 65535 { return Port(0), ErrInvalidPortRange } return Port(val), nil } // PortFromString converts a string to a Port. // @error when the string is not an integer or the integral value is a not a valid Port. func PortFromString(s string) (Port, error) { val, err := strconv.ParseUint(s, 10, 32) if err != nil { return Port(0), ErrInvalidPortRange } return PortFromInt(uint32(val)) } // Value return the correspoding uint16 value of v Port. func (v Port) Value() uint16 { return uint16(v) } // Bytes returns the correspoding bytes of v Port, in big endian order. func (v Port) Bytes(b []byte) []byte { return serial.Uint16ToBytes(v.Value(), b) } // String returns the string presentation of v Port. func (v Port) String() string { return serial.Uint16ToString(v.Value()) } func (v PortRange) FromPort() Port { return Port(v.From) } func (v PortRange) ToPort() Port { return Port(v.To) } // Contains returns true if the given port is within the range of v PortRange. func (v PortRange) Contains(port Port) bool { return v.FromPort() <= port && port <= v.ToPort() }