//目前仅支持linux
func (a DeviceAddr) IpAddrDel() (err error) {
if !kmgPlatform.IsLinux() {
panic("[DeviceAddr.IpAddrDel] only support linux now")
}
one, _ := a.IPNet.Mask.Size()
return kmgCmd.CmdString(fmt.Sprintf("ip addr del %s/%d dev %s", a.IP.String(), one, a.DevString)).Run()
}
// 仅支持linux ipv4
func MustGetRouteTable() []*RouteRule {
if !kmgPlatform.IsLinux() {
panic("[MustGetRouteTable] only support linux now")
}
outputS := kmgCmd.MustCombinedOutput("netstat -nr")
lineList := strings.Split(string(outputS), "\n")
if len(lineList) < 2 {
panic("[getRouteTable] len(lineList)<2 " + string(outputS))
}
output := []*RouteRule{}
for i, line := range lineList[2:] {
line = strings.TrimSpace(line)
if line == "" {
continue
}
part := strings.Fields(line)
if len(part) < 4 {
panic(fmt.Errorf("[getRouteTable] len(part)<4 lineNum:%d content:%s", i, string(outputS)))
}
thisRule := &RouteRule{
Destination: part[0],
Gateway: part[1],
Genmask: part[2],
Iface: part[len(part)-1],
}
output = append(output, thisRule)
}
return output
}
//目前仅支持linux
func GetCurrentDeviceAddr() (ipnets []DeviceAddr, err error) {
if !kmgPlatform.IsLinux() {
panic("[GetCurrentDeviceAddr] only support linux now")
}
out, err := kmgCmd.CmdString("ip addr").RunAndReturnOutput()
if err != nil {
return
}
return getCurrentDeviceAddrFromIPAddr(out)
}
// 仅支持linux ipv4
// 返回nil表示没找到.
func MustGetDefaultRoute() *RouteRule {
if !kmgPlatform.IsLinux() {
panic("[MustGetDefaultRoute] only support linux now")
}
for _, route := range MustGetRouteTable() {
if route.Genmask == "0.0.0.0" {
return route
}
}
return nil
}
// 证实可用
func SetIpForwardOn() {
if !kmgPlatform.IsLinux() {
panic("[SetIpForwardOn] only support linux now")
}
kmgFile.MustWriteFile("/proc/sys/net/ipv4/ip_forward", []byte("1"))
// 已经证实,多次写入不会出现任何问题.
// TODO 正确解析/etc/sysctl.conf 如果后面又加一条 = 0 估计就挂了.
if !bytes.Contains(kmgFile.MustReadFile("/etc/sysctl.conf"), []byte("\nnet.ipv4.ip_forward = 1")) {
kmgFile.MustAppendFile("/etc/sysctl.conf", []byte("\nnet.ipv4.ip_forward = 1"))
}
}
func IsIpForwardOn() bool {
if !kmgPlatform.IsLinux() {
panic("[IsIpForwardOn] only support linux now")
}
b := kmgFile.MustReadFile("/proc/sys/net/ipv4/ip_forward")
if bytes.Contains(b, []byte{'0'}) {
return false
}
if bytes.Contains(b, []byte{'1'}) {
return true
}
panic(fmt.Errorf("[IsIpForwardOn] unable to understand info in /proc/sys/net/ipv4/ip_forward %#v", b))
}
// 返回nil表示没找到这个设备,或者这个设备上面没有ip
func MustGetFirstIPByNetDeviceName(devname string) net.IP {
if !kmgPlatform.IsLinux() {
panic("[GetFirstIPByNetDeviceName] only support linux now")
}
deviceAddrList, err := GetCurrentDeviceAddr()
if err != nil {
panic(err)
}
for _, deviceAddr := range deviceAddrList {
if deviceAddr.DevString == devname {
return deviceAddr.IP
}
}
return nil
}
//返回当前机器上面的所有ip列表.没有ip会报错
func MustGetCurrentIpList() (ipList []net.IP) {
if !kmgPlatform.IsLinux() {
panic("[MustGetCurrentIpList] only support linux now")
}
deviceAddrList, err := GetCurrentDeviceAddr()
if err != nil {
panic(err)
}
if len(deviceAddrList) == 0 {
panic(errors.New("[MustGetCurrentIpList] do not find any ip address."))
}
ipList = make([]net.IP, len(deviceAddrList))
for i, addr := range deviceAddrList {
ipList[i] = addr.IP
}
return ipList
}
func MustGetCurrentIpWithPortList(port uint16) (sList []string) {
if !kmgPlatform.IsLinux() {
panic("[MustGetCurrentIpWithPortList] only support linux now")
}
deviceAddrList, err := GetCurrentDeviceAddr()
if err != nil {
panic(err)
}
if len(deviceAddrList) == 0 {
panic(errors.New("[MustGetCurrentIpList] do not find any ip address."))
}
sList = make([]string, 0, len(deviceAddrList))
sPort := strconv.Itoa(int(port))
for _, addr := range deviceAddrList {
ones, size := addr.IPNet.Mask.Size()
if ones == size { // 实践表明 不能监听这种子网只有一个ip的地址.
continue
}
sList = append(sList, net.JoinHostPort(addr.IP.String(), sPort))
}
return sList
}