59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
package config
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import (
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"fmt"
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"net"
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)
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func GetOutboundIP() net.IP {
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conn, err := net.Dial("udp", "192.0.2.1:80")
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if err != nil {
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return nil
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}
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defer func() { _ = conn.Close() }()
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localAddr := conn.LocalAddr().(*net.UDPAddr)
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return localAddr.IP
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}
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func GetIPNetForIP(ip net.IP) (*net.IPNet, error) {
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interfaces, err := net.Interfaces()
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if err != nil {
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return nil, fmt.Errorf("failed to get network interfaces: %v", err)
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}
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for _, iface := range interfaces {
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// skip interfaces that are down or not relevant
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if iface.Flags&net.FlagUp == 0 {
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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 // try next interface
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}
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for _, addr := range addrs {
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// We expect addr to be of type *net.IPNet.
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var ipNet *net.IPNet
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switch v := addr.(type) {
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case *net.IPNet:
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ipNet = v
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case *net.IPAddr:
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// Wrap net.IPAddr in an IPNet with its default mask.
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ipNet = &net.IPNet{IP: v.IP, Mask: v.IP.DefaultMask()}
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}
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if ipNet == nil {
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continue
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}
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// Check if the IP matches (for IPv4, Equal works well)
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if ipNet.IP.Equal(ip) {
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return ipNet, nil
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}
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}
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}
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return nil, fmt.Errorf("could not find IPNet for IP %v", ip)
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}
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