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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package util | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "net/netip" | ||
| "strings" | ||
| ) | ||
|
|
||
| func JoinIPAddressPort(address string, port int) string { | ||
| if IsIPv6(address) { | ||
| return fmt.Sprintf("[%s]:%d", address, port) | ||
| } else { | ||
| return fmt.Sprintf("%s:%d", address, port) | ||
| } | ||
| } | ||
|
|
||
| func IsIPv6(address string) bool { | ||
| // See: https://stackoverflow.com/questions/22751035/golang-distinguish-ipv4-ipv6 | ||
| return strings.Contains(address, ":") | ||
| } | ||
|
|
||
| func IsUDPAddrEqual(a *net.UDPAddr, b *net.UDPAddr) bool { | ||
| return a.IP.Equal(b.IP) && (a.Port == b.Port) && (a.Zone == b.Zone) | ||
| } | ||
|
|
||
| func ToReachableIPAddress(address string) (string, error) { | ||
| if net.ParseIP(address).IsUnspecified() { | ||
| v6 := IsIPv6(address) | ||
| if interfaces, err := net.Interfaces(); err == nil { | ||
| for _, interface_ := range interfaces { | ||
| if (interface_.Flags&net.FlagLoopback == 0) && (interface_.Flags&net.FlagUp != 0) { | ||
| if addrs, err := interface_.Addrs(); err == nil { | ||
| for _, addr := range addrs { | ||
| if addr_, ok := addr.(*net.IPNet); ok { | ||
| //DumpIPAddress(addr_.IP.String()) | ||
| if addr_.IP.IsGlobalUnicast() { | ||
| ip := addr_.IP.String() | ||
| if v6 == IsIPv6(ip) { | ||
| return ip, nil | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } else { | ||
| return "", err | ||
| } | ||
| } | ||
| } | ||
| return "", fmt.Errorf("cannot find an equivalent reachable address for: %s", address) | ||
| } else { | ||
| return "", err | ||
| } | ||
| } | ||
|
|
||
| return address, nil | ||
| } | ||
|
|
||
| func ToBroadcastIPAddress(address string) (string, error) { | ||
| // Note: net.ParseIP can't parse IPv6 zone | ||
| if ip, err := netip.ParseAddr(address); err == nil { | ||
| if !ip.IsMulticast() { | ||
| return "", fmt.Errorf("not a multicast address: %s", address) | ||
| } | ||
|
|
||
| if IsIPv6(address) && ip.Zone() == "" { | ||
| if interfaces, err := net.Interfaces(); err == nil { | ||
| for _, interface_ := range interfaces { | ||
| //fmt.Printf("%s\n", interface_.Flags.String()) | ||
| if (interface_.Flags&net.FlagLoopback == 0) && (interface_.Flags&net.FlagUp != 0) && | ||
| (interface_.Flags&net.FlagBroadcast != 0) && (interface_.Flags&net.FlagMulticast != 0) { | ||
| return address + "%" + interface_.Name, nil | ||
| } | ||
| } | ||
| } else { | ||
| return "", err | ||
| } | ||
| return "", fmt.Errorf("cannot find a zone for: %s", address) | ||
| } | ||
|
|
||
| return address, nil | ||
| } else { | ||
| return "", err | ||
| } | ||
| } | ||
|
|
||
| func DumpIPAddress(address any) { | ||
| // Note: net.ParseIP can't parse IPv6 zone | ||
| ip := netip.MustParseAddr(ToString(address)) | ||
| fmt.Printf("address: %s\n", ip) | ||
| fmt.Printf(" global unicast: %t\n", ip.IsGlobalUnicast()) | ||
| fmt.Printf(" interface local multicast: %t\n", ip.IsInterfaceLocalMulticast()) | ||
| fmt.Printf(" link local multicast: %t\n", ip.IsLinkLocalMulticast()) | ||
| fmt.Printf(" link local unicast: %t\n", ip.IsLinkLocalUnicast()) | ||
| fmt.Printf(" loopback: %t\n", ip.IsLoopback()) | ||
| fmt.Printf(" multicast: %t\n", ip.IsMulticast()) | ||
| fmt.Printf(" private: %t\n", ip.IsPrivate()) | ||
| fmt.Printf(" unspecified: %t\n", ip.IsUnspecified()) | ||
| } |
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