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ip.go
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ip.go
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package manet
import (
"net"
ma "github.com/multiformats/go-multiaddr"
)
// Loopback Addresses
var (
// IP4Loopback is the ip4 loopback multiaddr
IP4Loopback = ma.StringCast("/ip4/127.0.0.1")
// IP6Loopback is the ip6 loopback multiaddr
IP6Loopback = ma.StringCast("/ip6/::1")
// IP4MappedIP6Loopback is the IPv4 Mapped IPv6 loopback address.
IP4MappedIP6Loopback = ma.StringCast("/ip6/::ffff:127.0.0.1")
)
// Unspecified Addresses (used for )
var (
IP4Unspecified = ma.StringCast("/ip4/0.0.0.0")
IP6Unspecified = ma.StringCast("/ip6/::")
)
// IsThinWaist returns whether a Multiaddr starts with "Thin Waist" Protocols.
// This means: /{IP4, IP6}[/{TCP, UDP}]
func IsThinWaist(m ma.Multiaddr) bool {
m = zoneless(m)
if m == nil {
return false
}
p := m.Protocols()
// nothing? not even a waist.
if len(p) == 0 {
return false
}
if p[0].Code != ma.P_IP4 && p[0].Code != ma.P_IP6 {
return false
}
// only IP? still counts.
if len(p) == 1 {
return true
}
switch p[1].Code {
case ma.P_TCP, ma.P_UDP, ma.P_IP4, ma.P_IP6:
return true
default:
return false
}
}
// IsIPLoopback returns whether a Multiaddr starts with a "Loopback" IP address
// This means either /ip4/127.*.*.*/*, /ip6/::1/*, or /ip6/::ffff:127.*.*.*.*/*,
// or /ip6zone/<any value>/ip6/<one of the preceding ip6 values>/*
func IsIPLoopback(m ma.Multiaddr) bool {
m = zoneless(m)
c, _ := ma.SplitFirst(m)
if c == nil {
return false
}
switch c.Protocol().Code {
case ma.P_IP4, ma.P_IP6:
return net.IP(c.RawValue()).IsLoopback()
}
return false
}
// IsIP6LinkLocal returns whether a Multiaddr starts with an IPv6 link-local
// multiaddress (with zero or one leading zone). These addresses are non
// routable.
func IsIP6LinkLocal(m ma.Multiaddr) bool {
m = zoneless(m)
c, _ := ma.SplitFirst(m)
if c == nil || c.Protocol().Code != ma.P_IP6 {
return false
}
ip := net.IP(c.RawValue())
return ip.IsLinkLocalMulticast() || ip.IsLinkLocalUnicast()
}
// IsIPUnspecified returns whether a Multiaddr starts with an Unspecified IP address
// This means either /ip4/0.0.0.0/* or /ip6/::/*
func IsIPUnspecified(m ma.Multiaddr) bool {
m = zoneless(m)
if m == nil {
return false
}
c, _ := ma.SplitFirst(m)
return net.IP(c.RawValue()).IsUnspecified()
}
// If m matches [zone,ip6,...], return [ip6,...]
// else if m matches [], [zone], or [zone,...], return nil
// else return m
func zoneless(m ma.Multiaddr) ma.Multiaddr {
head, tail := ma.SplitFirst(m)
if head == nil {
return nil
}
if head.Protocol().Code == ma.P_IP6ZONE {
if tail == nil {
return nil
}
tailhead, _ := ma.SplitFirst(tail)
if tailhead.Protocol().Code != ma.P_IP6 {
return nil
}
return tail
} else {
return m
}
}