38 lines
803 B
Go
38 lines
803 B
Go
package agent
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import (
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"fmt"
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"math/rand"
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"net"
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"time"
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)
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// Returns a random stagger interval between 0 and the duration
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func randomStagger(intv time.Duration) time.Duration {
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return time.Duration(uint64(rand.Int63()) % uint64(intv))
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}
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// IpOfDevice returns a routable ip addr of a device
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func IpOfDevice(name string) (net.IP, error) {
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intf, err := net.InterfaceByName(name)
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if err != nil {
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return nil, err
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}
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addrs, err := intf.Addrs()
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if err != nil {
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return nil, err
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}
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if len(addrs) == 0 {
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return nil, fmt.Errorf("no ips were detected on the interface: %v", name)
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}
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for _, addr := range addrs {
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switch v := (addr).(type) {
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case *net.IPNet:
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continue
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case *net.IPAddr:
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return v.IP, nil
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}
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}
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return nil, fmt.Errorf("no ips were detected on the interface: %v", name)
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}
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