wide/util/net.go

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// Utilities.
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package util
import (
"errors"
"net"
)
type mynet struct{}
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// Network utilities.
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var Net = mynet{}
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// LocalIP gets the first NIC's IP address.
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func (*mynet) LocalIP() (string, error) {
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tt, err := net.Interfaces()
if err != nil {
return "", err
}
for _, t := range tt {
aa, err := t.Addrs()
if err != nil {
return "", err
}
for _, a := range aa {
switch ip := a.(type) {
case *net.IPAddr:
v4 := ip.IP.To4()
if v4 == nil || v4.IsLoopback() || v4.IsUnspecified() {
continue
}
return v4.String(), nil
case *net.IPNet:
v4 := ip.IP.To4()
if v4 == nil || v4.IsLoopback() || v4.IsUnspecified() {
continue
}
return v4.String(), nil
default:
return "", errors.New("cannot find local IP address")
}
}
}
return "", errors.New("cannot find local IP address")
}