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* fix: minor log typo * fix: #2895 no need to specify listen port in config file, just use system random * drop useless code
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
| // addr provides functions to retrieve local IP addresses from device interfaces. | ||
| package addr | ||
|
|
||
| import ( | ||
| "net" | ||
|
|
||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| var ( | ||
| // ErrIPNotFound no IP address found, and explicit IP not provided. | ||
| ErrIPNotFound = errors.New("no IP address found, and explicit IP not provided") | ||
| ) | ||
|
|
||
| // IsLocal checks whether an IP belongs to one of the device's interfaces. | ||
| func IsLocal(addr string) bool { | ||
| // Extract the host | ||
| host, _, err := net.SplitHostPort(addr) | ||
| if err == nil { | ||
| addr = host | ||
| } | ||
|
|
||
| if addr == "localhost" { | ||
| return true | ||
| } | ||
|
|
||
| // Check against all local ips | ||
| for _, ip := range IPs() { | ||
| if addr == ip { | ||
| return true | ||
| } | ||
| } | ||
|
|
||
| return false | ||
| } | ||
|
|
||
| // Extract returns a valid IP address. If the address provided is a valid | ||
| // address, it will be returned directly. Otherwise, the available interfaces | ||
| // will be iterated over to find an IP address, preferably private. | ||
| func Extract(addr string) (string, error) { | ||
| // if addr is already specified then it's directly returned | ||
| if len(addr) > 0 && (addr != "0.0.0.0" && addr != "[::]" && addr != "::") { | ||
| return addr, nil | ||
| } | ||
|
|
||
| var ( | ||
| addrs []net.Addr | ||
| loAddrs []net.Addr | ||
| ) | ||
|
|
||
| ifaces, err := net.Interfaces() | ||
| if err != nil { | ||
| return "", errors.Wrap(err, "failed to get interfaces") | ||
| } | ||
|
|
||
| for _, iface := range ifaces { | ||
| ifaceAddrs, err := iface.Addrs() | ||
| if err != nil { | ||
| // ignore error, interface can disappear from system | ||
| continue | ||
| } | ||
|
|
||
| if iface.Flags&net.FlagLoopback != 0 { | ||
| loAddrs = append(loAddrs, ifaceAddrs...) | ||
| continue | ||
| } | ||
|
|
||
| addrs = append(addrs, ifaceAddrs...) | ||
| } | ||
|
|
||
| // Add loopback addresses to the end of the list | ||
| addrs = append(addrs, loAddrs...) | ||
|
|
||
| // Try to find private IP in list, public IP otherwise | ||
| ip, err := findIP(addrs) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| return ip.String(), nil | ||
| } | ||
|
|
||
| // IPs returns all available interface IP addresses. | ||
| func IPs() []string { | ||
| ifaces, err := net.Interfaces() | ||
| if err != nil { | ||
| return nil | ||
| } | ||
|
|
||
| var ipAddrs []string | ||
|
|
||
| for _, i := range ifaces { | ||
| addrs, err := i.Addrs() | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
|
||
| for _, addr := range addrs { | ||
| var ip net.IP | ||
| switch v := addr.(type) { | ||
| case *net.IPNet: | ||
| ip = v.IP | ||
| case *net.IPAddr: | ||
| ip = v.IP | ||
| } | ||
|
|
||
| if ip == nil { | ||
| continue | ||
| } | ||
|
|
||
| ipAddrs = append(ipAddrs, ip.String()) | ||
| } | ||
| } | ||
|
|
||
| return ipAddrs | ||
| } | ||
|
|
||
| // findIP will return the first private IP available in the list. | ||
| // If no private IP is available it will return the first public IP, if present. | ||
| // If no public IP is available, it will return the first loopback IP, if present. | ||
| func findIP(addresses []net.Addr) (net.IP, error) { | ||
| var publicIP net.IP | ||
| var localIP net.IP | ||
|
|
||
| for _, rawAddr := range addresses { | ||
| var ip net.IP | ||
| switch addr := rawAddr.(type) { | ||
| case *net.IPAddr: | ||
| ip = addr.IP | ||
| case *net.IPNet: | ||
| ip = addr.IP | ||
| default: | ||
| continue | ||
| } | ||
|
|
||
| if ip.IsLoopback() { | ||
| if localIP == nil { | ||
| localIP = ip | ||
| } | ||
| continue | ||
| } | ||
|
|
||
| if !ip.IsPrivate() { | ||
| if publicIP == nil { | ||
| publicIP = ip | ||
| } | ||
| continue | ||
| } | ||
|
|
||
| // Return private IP if available | ||
| return ip, nil | ||
| } | ||
|
|
||
| // Return public or virtual IP | ||
| if len(publicIP) > 0 { | ||
| return publicIP, nil | ||
| } | ||
|
|
||
| // Return local IP | ||
| if len(localIP) > 0 { | ||
| return localIP, nil | ||
| } | ||
|
|
||
| return nil, ErrIPNotFound | ||
| } |
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