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ports.go
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ports.go
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// Copyright 2012 Google, Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree.
package layers
import (
"fmt"
"strconv"
"github.com/google/gopacket"
)
// TCPPort is a port in a TCP layer.
type TCPPort uint16
// UDPPort is a port in a UDP layer.
type UDPPort uint16
// RUDPPort is a port in a RUDP layer.
type RUDPPort uint8
// SCTPPort is a port in a SCTP layer.
type SCTPPort uint16
// UDPLitePort is a port in a UDPLite layer.
type UDPLitePort uint16
// RUDPPortNames contains the string names for all RUDP ports.
var RUDPPortNames = map[RUDPPort]string{}
// UDPLitePortNames contains the string names for all UDPLite ports.
var UDPLitePortNames = map[UDPLitePort]string{}
// {TCP,UDP,SCTP}PortNames can be found in iana_ports.go
// String returns the port as "number(name)" if there's a well-known port name,
// or just "number" if there isn't. Well-known names are stored in
// TCPPortNames.
func (a TCPPort) String() string {
if name, ok := TCPPortNames[a]; ok {
return fmt.Sprintf("%d(%s)", a, name)
}
return strconv.Itoa(int(a))
}
// LayerType returns a LayerType that would be able to decode the
// application payload. It uses some well-known ports such as 53 for
// DNS.
//
// Returns gopacket.LayerTypePayload for unknown/unsupported port numbers.
func (a TCPPort) LayerType() gopacket.LayerType {
if tcpPortLayerTypeOverride.has(uint16(a)) {
return tcpPortLayerType[a]
}
switch a {
case 53:
return LayerTypeDNS
case 443: // https
return LayerTypeTLS
case 502: // modbustcp
return LayerTypeModbusTCP
case 636: // ldaps
return LayerTypeTLS
case 989: // ftps-data
return LayerTypeTLS
case 990: // ftps
return LayerTypeTLS
case 992: // telnets
return LayerTypeTLS
case 993: // imaps
return LayerTypeTLS
case 994: // ircs
return LayerTypeTLS
case 995: // pop3s
return LayerTypeTLS
case 5061: // ips
return LayerTypeTLS
}
return gopacket.LayerTypePayload
}
var tcpPortLayerTypeOverride bitfield
var tcpPortLayerType = map[TCPPort]gopacket.LayerType{}
// RegisterTCPPortLayerType creates a new mapping between a TCPPort
// and an underlaying LayerType.
func RegisterTCPPortLayerType(port TCPPort, layerType gopacket.LayerType) {
tcpPortLayerTypeOverride.set(uint16(port))
tcpPortLayerType[port] = layerType
}
// String returns the port as "number(name)" if there's a well-known port name,
// or just "number" if there isn't. Well-known names are stored in
// UDPPortNames.
func (a UDPPort) String() string {
if name, ok := UDPPortNames[a]; ok {
return fmt.Sprintf("%d(%s)", a, name)
}
return strconv.Itoa(int(a))
}
// LayerType returns a LayerType that would be able to decode the
// application payload. It uses some well-known ports such as 53 for
// DNS.
//
// Returns gopacket.LayerTypePayload for unknown/unsupported port numbers.
func (a UDPPort) LayerType() gopacket.LayerType {
if udpPortLayerTypeOverride.has(uint16(a)) {
return udpPortLayerType[a]
}
switch a {
case 53:
return LayerTypeDNS
case 67:
return LayerTypeDHCPv4
case 68:
return LayerTypeDHCPv4
case 123:
return LayerTypeNTP
case 546:
return LayerTypeDHCPv6
case 547:
return LayerTypeDHCPv6
case 623:
return LayerTypeRMCP
case 1812:
return LayerTypeRADIUS
case 2152:
return LayerTypeGTPv1U
case 3784:
return LayerTypeBFD
case 4789:
return LayerTypeVXLAN
case 5060:
return LayerTypeSIP
case 6081:
return LayerTypeGeneve
case 6343:
return LayerTypeSFlow
}
return gopacket.LayerTypePayload
}
var udpPortLayerTypeOverride bitfield
var udpPortLayerType = map[UDPPort]gopacket.LayerType{}
// RegisterUDPPortLayerType creates a new mapping between a UDPPort
// and an underlaying LayerType.
func RegisterUDPPortLayerType(port UDPPort, layerType gopacket.LayerType) {
udpPortLayerTypeOverride.set(uint16(port))
udpPortLayerType[port] = layerType
}
// String returns the port as "number(name)" if there's a well-known port name,
// or just "number" if there isn't. Well-known names are stored in
// RUDPPortNames.
func (a RUDPPort) String() string {
if name, ok := RUDPPortNames[a]; ok {
return fmt.Sprintf("%d(%s)", a, name)
}
return strconv.Itoa(int(a))
}
// String returns the port as "number(name)" if there's a well-known port name,
// or just "number" if there isn't. Well-known names are stored in
// SCTPPortNames.
func (a SCTPPort) String() string {
if name, ok := SCTPPortNames[a]; ok {
return fmt.Sprintf("%d(%s)", a, name)
}
return strconv.Itoa(int(a))
}
// String returns the port as "number(name)" if there's a well-known port name,
// or just "number" if there isn't. Well-known names are stored in
// UDPLitePortNames.
func (a UDPLitePort) String() string {
if name, ok := UDPLitePortNames[a]; ok {
return fmt.Sprintf("%d(%s)", a, name)
}
return strconv.Itoa(int(a))
}