d153db4280
Due to the way SSDP works, Flamenco Manager needs to know its own URL, where the Workers can reach it. These URLs are now found, and since there can be multiple (like IPv6 + IPv4) they are all sent in a SSDP notification as ;-separated strings.
130 lines
3.7 KiB
Go
130 lines
3.7 KiB
Go
package own_url
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/* (c) 2019, Blender Foundation - Sybren A. Stüvel
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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import (
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"errors"
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"fmt"
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"net"
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"github.com/rs/zerolog/log"
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)
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var (
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// ErrNoInterface is returned when no network interfaces with a real IP-address were found.
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ErrNoInterface = errors.New("no network interface found")
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)
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// networkInterfaces returns a list of interface addresses.
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// Only those addresses that can be eached by a unicast TCP/IP connection are returned.
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func networkInterfaces(includeLinkLocal, includeLocalhost bool) ([]net.IP, error) {
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log.Debug().Msg("iterating over all network interfaces")
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interfaces, err := net.Interfaces()
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if err != nil {
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return []net.IP{}, err
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}
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usableAddresses := make([]net.IP, 0)
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for _, iface := range interfaces {
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if iface.Flags&net.FlagUp == 0 {
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log.Debug().Str("interface", iface.Name).Msg("skipping down interface")
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continue
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}
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addrs, err := iface.Addrs()
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if err != nil {
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continue
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}
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ifaceAddresses := make([]net.IP, 0)
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for k := range addrs {
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var ip net.IP
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switch a := addrs[k].(type) {
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case *net.IPAddr:
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ip = a.IP
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case *net.IPNet:
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ip = a.IP
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default:
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log.Warn().
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Interface("addr", addrs[k]).
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Str("type", fmt.Sprintf("%T", addrs[k])).
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Msg(" - skipping unknown interface type")
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continue
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}
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logger := log.With().
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Interface("ip", ip).
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Str("iface", iface.Name).
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Logger()
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switch {
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case ip.IsMulticast():
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logger.Debug().Msg(" - skipping multicast")
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case ip.IsMulticast():
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logger.Debug().Msg(" - skipping multicast")
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case ip.IsUnspecified():
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logger.Debug().Msg(" - skipping unspecified")
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case !includeLinkLocal && ip.IsLinkLocalUnicast():
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logger.Debug().Msg(" - skipping link-local")
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case !includeLocalhost && ip.IsLoopback():
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logger.Debug().Msg(" - skipping localhost")
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default:
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logger.Debug().Msg(" - usable")
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ifaceAddresses = append(ifaceAddresses, ip)
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}
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}
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usableAddresses = append(usableAddresses, filterAddresses(ifaceAddresses)...)
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}
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if len(usableAddresses) == 0 {
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return usableAddresses, ErrNoInterface
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}
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return usableAddresses, nil
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}
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// filterAddresses removes "privacy extension" addresses.
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// It assumes the list of addresses belong to the same network interface, and
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// that the OS reports preferred (i.e. private/random) addresses before
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// non-random ones.
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func filterAddresses(addrs []net.IP) []net.IP {
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keep := make([]net.IP, 0)
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var lastSeenIP net.IP
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for _, addr := range addrs {
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if addr.To4() != nil {
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// IPv4 addresses are always kept.
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keep = append(keep, addr)
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continue
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}
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lastSeenIP = addr
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}
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if len(lastSeenIP) > 0 {
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keep = append(keep, lastSeenIP)
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}
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return keep
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}
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