forked from davyxu/cellnet
/
addr.go
311 lines (255 loc) · 6.64 KB
/
addr.go
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package util
import (
"errors"
"fmt"
"github.com/davyxu/cellnet"
"net"
"strconv"
"strings"
)
// 将普通地址格式(host:port)拆分
func SpliteAddress(addr string) (host string, port int, err error) {
var portStr string
host, portStr, err = net.SplitHostPort(addr)
if err != nil {
return "", 0, err
}
port, err = strconv.Atoi(portStr)
if err != nil {
return "", 0, err
}
return
}
// 将host和端口合并为(host:port)格式的地址
func JoinAddress(host string, port int) string {
return fmt.Sprintf("%s:%d", host, port)
}
// 修复ws没有实现所有net.conn方法,导致无法获取客服端地址问题.
type RemoteAddr interface {
RemoteAddr() net.Addr
}
// 获取session远程的地址
func GetRemoteAddrss(ses cellnet.Session) (string, bool) {
if c, ok := ses.Raw().(RemoteAddr); ok {
return c.RemoteAddr().String(), true
}
return "", false
}
var (
ErrInvalidPortRange = errors.New("invalid port range")
)
// 支持地址范围的格式
type Address struct {
Scheme string
Host string
MinPort int
MaxPort int
Path string
}
// 返回(host:port)格式地址
func (self *Address) HostPortString(port int) string {
return fmt.Sprintf("%s:%d", self.Host, port)
}
// 返回scheme://host:port/path 格式地址
func (self *Address) String(port int) string {
if self.Scheme == "" {
return self.HostPortString(port)
}
return fmt.Sprintf("%s://%s:%d%s", self.Scheme, self.Host, port, self.Path)
}
// cellnet专有的地址格式 scheme://host:minPort~maxPort/path 提供地址范围扩展
func ParseAddress(addr string) (addrObj *Address, err error) {
addrObj = new(Address)
schemePos := strings.Index(addr, "://")
// 移除scheme部分
if schemePos != -1 {
addrObj.Scheme = addr[:schemePos]
addr = addr[schemePos+3:]
}
colonPos := strings.Index(addr, ":")
if colonPos != -1 {
addrObj.Host = addr[:colonPos]
}
addr = addr[colonPos+1:]
rangePos := strings.Index(addr, "~")
var minStr, maxStr string
if rangePos != -1 {
minStr = addr[:rangePos]
slashPos := strings.Index(addr, "/")
if slashPos != -1 {
maxStr = addr[rangePos+1 : slashPos]
addrObj.Path = addr[slashPos:]
} else {
maxStr = addr[rangePos+1:]
}
} else {
slashPos := strings.Index(addr, "/")
if slashPos != -1 {
addrObj.Path = addr[slashPos:]
minStr = addr[rangePos+1 : slashPos]
} else {
minStr = addr[rangePos+1:]
}
}
// extract min port
addrObj.MinPort, err = strconv.Atoi(minStr)
if err != nil {
return nil, ErrInvalidPortRange
}
if maxStr != "" {
// extract max port
addrObj.MaxPort, err = strconv.Atoi(maxStr)
if err != nil {
return nil, ErrInvalidPortRange
}
} else {
addrObj.MaxPort = addrObj.MinPort
}
return
}
// 在给定的端口范围内找到一个能用的端口 addr格式参考ParseAddress函数
func DetectPort(addr string, fn func(a *Address, port int) (interface{}, error)) (interface{}, error) {
addrObj, err := ParseAddress(addr)
if err != nil {
return nil, err
}
for port := addrObj.MinPort; port <= addrObj.MaxPort; port++ {
// 使用回调侦听
ln, err := fn(addrObj, port)
if err == nil {
return ln, nil
}
// hit max port
if port == addrObj.MaxPort {
return nil, err
}
}
return nil, fmt.Errorf("unable to bind to %s", addr)
}
// 获取本地IP地址,有多重IP时,默认取第一个
func GetLocalIP() string {
// TODO 全面支持IPV6地址
list, err := GetPrivateIPv4()
if err != nil {
return ""
}
if len(list) == 0 {
return ""
}
return list[0].String()
}
// 获得本机的IPV4的地址
func GetPrivateIPv4() ([]*net.IPAddr, error) {
addresses, err := activeInterfaceAddresses()
if err != nil {
return nil, fmt.Errorf("Failed to get interface addresses: %v", err)
}
var addrs []*net.IPAddr
for _, rawAddr := range addresses {
var ip net.IP
switch addr := rawAddr.(type) {
case *net.IPAddr:
ip = addr.IP
case *net.IPNet:
ip = addr.IP
default:
continue
}
if ip.To4() == nil {
continue
}
if !isPrivate(ip) {
continue
}
addrs = append(addrs, &net.IPAddr{IP: ip})
}
return addrs, nil
}
// 获得本机的IPV6地址
func GetPublicIPv6() ([]*net.IPAddr, error) {
addresses, err := net.InterfaceAddrs()
if err != nil {
return nil, fmt.Errorf("Failed to get interface addresses: %v", err)
}
var addrs []*net.IPAddr
for _, rawAddr := range addresses {
var ip net.IP
switch addr := rawAddr.(type) {
case *net.IPAddr:
ip = addr.IP
case *net.IPNet:
ip = addr.IP
default:
continue
}
if ip.To4() != nil {
continue
}
if isPrivate(ip) {
continue
}
addrs = append(addrs, &net.IPAddr{IP: ip})
}
return addrs, nil
}
// privateBlocks contains non-forwardable address blocks which are used
// for private networks. RFC 6890 provides an overview of special
// address blocks.
var privateBlocks = []*net.IPNet{
parseCIDR("10.0.0.0/8"), // RFC 1918 IPv4 private network address
parseCIDR("100.64.0.0/10"), // RFC 6598 IPv4 shared address space
parseCIDR("127.0.0.0/8"), // RFC 1122 IPv4 loopback address
parseCIDR("169.254.0.0/16"), // RFC 3927 IPv4 link local address
parseCIDR("172.16.0.0/12"), // RFC 1918 IPv4 private network address
parseCIDR("192.0.0.0/24"), // RFC 6890 IPv4 IANA address
parseCIDR("192.0.2.0/24"), // RFC 5737 IPv4 documentation address
parseCIDR("192.168.0.0/16"), // RFC 1918 IPv4 private network address
parseCIDR("::1/128"), // RFC 1884 IPv6 loopback address
parseCIDR("fe80::/10"), // RFC 4291 IPv6 link local addresses
parseCIDR("fc00::/7"), // RFC 4193 IPv6 unique local addresses
parseCIDR("fec0::/10"), // RFC 1884 IPv6 site-local addresses
parseCIDR("2001:db8::/32"), // RFC 3849 IPv6 documentation address
}
func parseCIDR(s string) *net.IPNet {
_, block, err := net.ParseCIDR(s)
if err != nil {
panic(fmt.Sprintf("Bad CIDR %s: %s", s, err))
}
return block
}
func isPrivate(ip net.IP) bool {
for _, priv := range privateBlocks {
if priv.Contains(ip) {
return true
}
}
return false
}
// Returns addresses from interfaces that is up
func activeInterfaceAddresses() ([]net.Addr, error) {
var upAddrs []net.Addr
var loAddrs []net.Addr
interfaces, err := net.Interfaces()
if err != nil {
return nil, fmt.Errorf("Failed to get interfaces: %v", err)
}
for _, iface := range interfaces {
// Require interface to be up
if iface.Flags&net.FlagUp == 0 {
continue
}
addresses, err := iface.Addrs()
if err != nil {
return nil, fmt.Errorf("Failed to get interface addresses: %v", err)
}
if iface.Flags&net.FlagLoopback != 0 {
loAddrs = append(loAddrs, addresses...)
continue
}
upAddrs = append(upAddrs, addresses...)
}
if len(upAddrs) == 0 {
return loAddrs, nil
}
return upAddrs, nil
}