129 lines
2.4 KiB
Go
129 lines
2.4 KiB
Go
package envx
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import (
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"net"
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"os"
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"strconv"
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"strings"
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)
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func String(key, fallback string) string {
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if v := os.Getenv(key); v != "" {
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return v
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}
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return fallback
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}
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func Int(key string, fallback int) int {
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if v := os.Getenv(key); v != "" {
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if i, err := strconv.Atoi(v); err == nil {
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return i
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}
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}
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return fallback
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}
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func LocalIP() string {
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for _, key := range []string{"nacos_bindIp", "NACOS_BIND_IP", "LOCAL_IP", "BIND_IP"} {
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if ip := validIPv4(os.Getenv(key)); ip != "" {
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return ip
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}
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}
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if ip := hostnameIP(); ip != "" {
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return ip
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}
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if ip := interfaceIP(); ip != "" {
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return ip
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}
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if ip := outboundIP(); ip != "" {
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return ip
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}
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return "127.0.0.1"
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}
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func hostnameIP() string {
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hostname, err := os.Hostname()
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if err != nil || hostname == "" {
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return ""
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}
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addrs, err := net.LookupIP(hostname)
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if err != nil {
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return ""
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}
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for _, addr := range addrs {
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if ip := validIPv4(addr.String()); ip != "" {
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return ip
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}
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}
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return ""
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}
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func interfaceIP() string {
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ifaces, err := net.Interfaces()
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if err != nil {
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return ""
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}
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bestIP := ""
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bestScore := -1
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for _, iface := range ifaces {
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if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 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
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}
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for _, addr := range addrs {
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ipNet, ok := addr.(*net.IPNet)
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if !ok {
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continue
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}
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ip := validIPv4(ipNet.IP.String())
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if ip == "" {
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continue
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}
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score := interfaceScore(iface.Name)
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if score > bestScore {
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bestIP = ip
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bestScore = score
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}
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}
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}
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return bestIP
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}
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func interfaceScore(name string) int {
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name = strings.ToLower(name)
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switch {
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case name == "eth0":
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return 100
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case strings.HasPrefix(name, "eth"):
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return 90
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case strings.HasPrefix(name, "en"), strings.HasPrefix(name, "wl"):
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return 80
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case strings.Contains(name, "docker"), strings.HasPrefix(name, "br-"), strings.HasPrefix(name, "veth"):
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return 10
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default:
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return 50
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}
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}
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func outboundIP() string {
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conn, err := net.Dial("udp", "8.8.8.8:80")
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if err == nil {
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defer conn.Close()
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if addr, ok := conn.LocalAddr().(*net.UDPAddr); ok {
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return validIPv4(addr.IP.String())
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}
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}
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return ""
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}
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func validIPv4(value string) string {
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ip := net.ParseIP(strings.TrimSpace(value)).To4()
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if ip == nil || ip.IsLoopback() || ip.IsUnspecified() || ip.IsLinkLocalUnicast() {
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return ""
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}
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return ip.String()
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}
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