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ip.go
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ip.go
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package znet
import (
"errors"
"math"
"math/big"
"net"
"net/http"
"strconv"
"strings"
)
var localNetworks []*net.IPNet
var (
RemoteIPHeaders = []string{"X-Forwarded-For", "X-Real-IP"}
TrustedProxies = []string{"0.0.0.0/0"}
)
func init() {
localNetworks = make([]*net.IPNet, 5)
for i, sNetwork := range []string{
"127.0.0.0/8",
"10.0.0.0/8",
"169.254.0.0/16",
"172.16.0.0/12",
"192.168.0.0/16",
} {
_, network, _ := net.ParseCIDR(sNetwork)
localNetworks[i] = network
}
}
// IsLocalAddrIP IsLocalAddrIP
func IsLocalAddrIP(ip string) bool {
return IsLocalIP(net.ParseIP(ip))
}
// IsLocalIP IsLocalIP
func IsLocalIP(ip net.IP) bool {
for _, network := range localNetworks {
if network.Contains(ip) {
return true
}
}
if ip.String() == "0.0.0.0" {
return true
}
return ip.IsLoopback() || ip.IsLinkLocalMulticast() || ip.IsLinkLocalUnicast()
}
// func trustedProxies() []*net.IPNet {
// trusted := make([]*net.IPNet, 0)
// for i := range TrustedProxies {
// n, err := netCIDR(TrustedProxies[i])
// if err != nil {
// continue
// }
// trusted = append(trusted, n)
// }
// return trusted
// }
func getTrustedIP(r *http.Request, remoteIP string) string {
ip := remoteIP
for i := range RemoteIPHeaders {
key := RemoteIPHeaders[i]
val := r.Header.Get(key)
ips := parseHeadersIP(val)
for i := range ips {
Log.Debug(i, ips[i])
}
}
return ip
}
func getRemoteIP(r *http.Request) []string {
ips := make([]string, 0)
ip := RemoteIP(r)
trusted := ip == ""
if !trusted {
for i := range TrustedProxies {
proxy := TrustedProxies[i]
if InNetwork(ip, proxy) {
trusted = true
break
}
}
}
if trusted {
for i := range RemoteIPHeaders {
key := RemoteIPHeaders[i]
val := r.Header.Get(key)
ips = append(ips, parseHeadersIP(val)...)
}
}
return append(ips, ip)
}
func parseHeadersIP(val string) []string {
if val == "" {
return []string{}
}
str := strings.Split(val, ",")
l := len(str)
ips := make([]string, l)
for i := l - 1; i >= 0; i-- {
ips[l-1-i] = strings.TrimSpace(str[i])
}
return ips
}
// ClientIP ClientIP
func ClientIP(r *http.Request) (ip string) {
ips := getRemoteIP(r)
if len(ips) > 0 && ips[0] != "" {
return ips[0]
}
return
}
// ClientPublicIP ClientPublicIP
func ClientPublicIP(r *http.Request) string {
var ip string
ips := getRemoteIP(r)
for i := range ips {
ip = ips[i]
if ip != "" && !IsLocalAddrIP(ip) {
return ip
}
}
return ""
}
// RemoteIP Remote IP
func RemoteIP(r *http.Request) string {
if ip, _, err := net.SplitHostPort(strings.TrimSpace(r.RemoteAddr)); err == nil {
return ip
}
return ""
}
// IPToLong IPToLong
func IPToLong(ip string) (i uint, err error) {
return NetIPToLong(net.ParseIP(ip))
}
// LongToIP LongToIP
func LongToIP(i uint) (string, error) {
ip, err := LongToNetIP(i)
if err != nil {
return "", err
}
return ip.String(), nil
}
// NetIPToLong NetIPToLong
func NetIPToLong(ip net.IP) (i uint, err error) {
b := ip.To4()
if b == nil {
err = errors.New("invalid ipv4 format")
return
}
i = uint(b[3]) | uint(b[2])<<8 | uint(b[1])<<16 | uint(b[0])<<24
return
}
// NetIPv6ToLong NetIPv6ToLong
func NetIPv6ToLong(ip net.IP) (*big.Int, error) {
if ip == nil {
return nil, errors.New("invalid ipv6 format")
}
IPv6Int := big.NewInt(0)
IPv6Int.SetBytes(ip.To16())
return IPv6Int, nil
}
// LongToNetIP LongToNetIP
func LongToNetIP(i uint) (ip net.IP, err error) {
if i > math.MaxUint32 {
err = errors.New("beyond the scope of ipv4")
return
}
ip = make(net.IP, net.IPv4len)
ip[0] = byte(i >> 24)
ip[1] = byte(i >> 16)
ip[2] = byte(i >> 8)
ip[3] = byte(i)
return
}
// LongToNetIPv6 LongToNetIPv6
func LongToNetIPv6(i *big.Int) (ip net.IP, err error) {
ip = i.Bytes()
return
}
// IsIP IsIP
func IsIP(ip string) bool {
return net.ParseIP(ip) != nil
}
// GetIPv GetIPv
func GetIPv(s string) int {
for i := 0; i < len(s); i++ {
switch s[i] {
case '.':
return 4
case ':':
return 6
}
}
return 0
}
func netCIDR(network string) (*net.IPNet, error) {
_, n, err := net.ParseCIDR(network)
if err != nil && IsIP(network) {
_, n, err = net.ParseCIDR(network + "/24")
}
if err != nil {
return nil, err
}
return n, nil
}
// InNetwork InNetwork
func InNetwork(ip, network string) bool {
n, err := netCIDR(network)
if err != nil {
return false
}
netIP := net.ParseIP(ip)
return n.Contains(netIP)
}
// Port GetPort Check if the port is available, if not, then automatically get an available
func Port(port int, change bool) (newPort int, err error) {
host := ":" + strconv.Itoa(port)
listener, err := net.Listen("tcp", host)
if err != nil {
if !change && port != 0 {
return 0, err
}
listener, err = net.Listen("tcp", ":0")
if err != nil {
return 0, err
}
}
defer listener.Close()
addr := listener.Addr().String()
_, portString, err := net.SplitHostPort(addr)
if err != nil {
return 0, err
}
return strconv.Atoi(portString)
}
// MultiplePort Check if the multiple port is available, if not, then automatically get an available
func MultiplePort(ports []int, change bool) (int, error) {
last := len(ports) - 1
for k, v := range ports {
c := false
if last == k {
c = change
}
n, err := Port(v, c)
if err == nil {
return n, nil
}
}
return 0, errors.New("no available port")
}