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util.go
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util.go
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package netutil
import (
"errors"
"fmt"
"io"
"net"
"net/http"
"regexp"
"strings"
"syscall"
"time"
"github.com/pubgo/funk/assert"
)
var localIp = assert.Exit1(regexp.Compile(`\d+\.\d+\.\d+\.\d+`))
func GetLocalIP() string {
localIP := "localhost"
// skip the error since we don't want to break RPC calls because of it
addresses, err := net.InterfaceAddrs()
if err != nil {
return localIP
}
for _, addr := range addresses {
items := strings.Split(addr.String(), "/")
if len(items) < 2 || items[0] == "127.0.0.1" {
continue
}
if localIp.MatchString(items[0]) {
localIP = items[0]
}
}
return localIP
}
// IsPortUsed 检查端口是否被占用
func IsPortUsed(protocol, addr string) bool {
conn, err := net.DialTimeout(protocol, addr, 3*time.Second)
if err != nil {
return false
}
defer conn.Close()
return true
}
// DiscoverDNS ...
func DiscoverDNS(service, proto, address string) ([]*net.SRV, error) {
_, addresses, err := net.LookupSRV(service, proto, address)
if err != nil {
return nil, err
}
if len(addresses) == 0 {
return nil, errors.New("discovery: srv lookup nothing")
}
return addresses, nil
}
var errUnexpectedRead = errors.New("unexpected read from socket")
func ConnCheck(conn net.Conn) error {
var sysErr error
sysConn, ok := conn.(syscall.Conn)
if !ok {
return nil
}
rawConn, err := sysConn.SyscallConn()
if err != nil {
return err
}
err = rawConn.Read(func(fd uintptr) bool {
var buf [1]byte
n, err := syscall.Read(int(fd), buf[:])
switch {
case n == 0 && err == nil:
sysErr = io.EOF
case n > 0:
sysErr = errUnexpectedRead
case err == syscall.EAGAIN || err == syscall.EWOULDBLOCK:
sysErr = nil
default:
sysErr = err
}
return true
})
if err != nil {
return err
}
return sysErr
}
const (
XForwardedFor = "X-Forwarded-For"
XRealIP = "X-Real-IP"
)
// RemoteIp 返回远程客户端的 IP,如 192.168.1.1
func RemoteIp(req *http.Request) string {
remoteAddr := req.RemoteAddr
if ip := req.Header.Get(XRealIP); ip != "" {
remoteAddr = ip
} else if ip = req.Header.Get(XForwardedFor); ip != "" {
remoteAddr = ip
} else {
remoteAddr, _, _ = net.SplitHostPort(remoteAddr)
}
if remoteAddr == "::1" {
remoteAddr = "127.0.0.1"
}
return remoteAddr
}
// GetIP returns request real ip.
func GetIP(r *http.Request) (string, error) {
ip := r.Header.Get("X-Real-IP")
if net.ParseIP(ip) != nil {
return ip, nil
}
ip = r.Header.Get("X-Forward-For")
for _, i := range strings.Split(ip, ",") {
if net.ParseIP(i) != nil {
return i, nil
}
}
ip, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
return "", err
}
if net.ParseIP(ip) != nil {
return ip, nil
}
return "", errors.New("no valid ip found")
}
func getIP(r *http.Request) (string, error) {
// Get IP from the X-REAL-IP header
ip := r.Header.Get("X-REAL-IP")
netIP := net.ParseIP(ip)
if netIP != nil {
return ip, nil
}
// Get IP from X-FORWARDED-FOR header
ips := r.Header.Get("X-FORWARDED-FOR")
splitIps := strings.Split(ips, ",")
for _, ip := range splitIps {
netIP := net.ParseIP(ip)
if netIP != nil {
return ip, nil
}
}
// Get IP from RemoteAddr
ip, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
return "", err
}
netIP = net.ParseIP(ip)
if netIP != nil {
return ip, nil
}
return "", fmt.Errorf("No valid ip found")
}