Listen on first link local unicast address
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parent
2d43dda380
commit
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@ -8,6 +8,8 @@ import (
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"net"
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"time"
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"fmt"
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"github.com/FreifunkBremen/respond-collector/data"
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"github.com/FreifunkBremen/respond-collector/database"
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"github.com/FreifunkBremen/respond-collector/jsontime"
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@ -27,14 +29,16 @@ type Collector struct {
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// NewCollector creates a Collector struct
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func NewCollector(db *database.DB, nodes *models.Nodes, iface string) *Collector {
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// Parse address
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addr, err := net.ResolveUDPAddr("udp", "[::]:0")
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linkLocalAddr, err := getLinkLocalAddr(iface)
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if err != nil {
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log.Panic(err)
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}
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// Open socket
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conn, err := net.ListenUDP("udp", addr)
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conn, err := net.ListenUDP("udp", &net.UDPAddr{
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IP: linkLocalAddr,
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Zone: iface,
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})
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if err != nil {
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log.Panic(err)
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}
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@ -59,6 +63,26 @@ func NewCollector(db *database.DB, nodes *models.Nodes, iface string) *Collector
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return collector
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}
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// Returns the first link local unicast address for the given interface name
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func getLinkLocalAddr(ifname string) (net.IP, error) {
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iface, err := net.InterfaceByName(ifname)
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if err != nil {
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return nil, err
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}
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addresses, err := iface.Addrs()
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if err != nil {
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return nil, err
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}
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for _, addr := range addresses {
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if ipnet := addr.(*net.IPNet); ipnet.IP.IsLinkLocalUnicast() {
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return ipnet.IP, nil
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}
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}
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return nil, fmt.Errorf("unable to find link local unicast address for %s", ifname)
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}
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// Start Collector
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func (coll *Collector) Start(interval time.Duration) {
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if coll.interval != 0 {
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