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Merge pull request #6170 from heyitsanthony/default-advertise-ip
use default ip for advertise URL
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| // Copyright 2016 The etcd Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
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| // +build !linux !386,!amd64 | ||
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| package netutil | ||
|
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||
| import ( | ||
| "fmt" | ||
| "runtime" | ||
| ) | ||
|
|
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| // GetDefaultHost fetches the a resolvable name that corresponds | ||
| // to the machine's default routable interface | ||
| func GetDefaultHost() (string, error) { | ||
| return "", fmt.Errorf("default host not supported on %s_%s", runtime.GOOS, runtime.GOARCH) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| // Copyright 2016 The etcd Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
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| // +build linux | ||
| // +build 386 amd64 | ||
|
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| // TODO support native endian but without using "unsafe" | ||
|
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| package netutil | ||
|
|
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| import ( | ||
| "bytes" | ||
| "encoding/binary" | ||
| "fmt" | ||
| "net" | ||
| "syscall" | ||
| ) | ||
|
|
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| var errNoDefaultRoute = fmt.Errorf("could not find default route") | ||
|
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| func GetDefaultHost() (string, error) { | ||
| rmsg, rerr := getDefaultRoute() | ||
| if rerr != nil { | ||
| return "", rerr | ||
| } | ||
|
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| attrs, aerr := syscall.ParseNetlinkRouteAttr(rmsg) | ||
| if aerr != nil { | ||
| return "", aerr | ||
| } | ||
|
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| oif := uint32(0) | ||
| for _, attr := range attrs { | ||
| if attr.Attr.Type == syscall.RTA_PREFSRC { | ||
| return net.IP(attr.Value).String(), nil | ||
| } | ||
| if attr.Attr.Type == syscall.RTA_OIF { | ||
| oif = binary.LittleEndian.Uint32(attr.Value) | ||
| } | ||
| } | ||
|
|
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| if oif == 0 { | ||
| return "", errNoDefaultRoute | ||
| } | ||
|
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| // prefsrc not detected, fall back to getting address from iface | ||
|
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| ifmsg, ierr := getIface(oif) | ||
| if ierr != nil { | ||
| return "", ierr | ||
| } | ||
|
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| attrs, aerr = syscall.ParseNetlinkRouteAttr(ifmsg) | ||
| if aerr != nil { | ||
| return "", aerr | ||
| } | ||
|
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| for _, attr := range attrs { | ||
| if attr.Attr.Type == syscall.RTA_SRC { | ||
| return net.IP(attr.Value).String(), nil | ||
| } | ||
| } | ||
|
|
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| return "", errNoDefaultRoute | ||
| } | ||
|
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| func getDefaultRoute() (*syscall.NetlinkMessage, error) { | ||
| dat, err := syscall.NetlinkRIB(syscall.RTM_GETROUTE, syscall.AF_UNSPEC) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| msgs, msgErr := syscall.ParseNetlinkMessage(dat) | ||
| if msgErr != nil { | ||
| return nil, msgErr | ||
| } | ||
|
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| rtmsg := syscall.RtMsg{} | ||
| for _, m := range msgs { | ||
| if m.Header.Type != syscall.RTM_NEWROUTE { | ||
| continue | ||
| } | ||
| buf := bytes.NewBuffer(m.Data[:syscall.SizeofRtMsg]) | ||
| if rerr := binary.Read(buf, binary.LittleEndian, &rtmsg); rerr != nil { | ||
| continue | ||
| } | ||
| if rtmsg.Dst_len == 0 { | ||
| // zero-length Dst_len implies default route | ||
| return &m, nil | ||
| } | ||
| } | ||
|
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| return nil, errNoDefaultRoute | ||
| } | ||
|
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| func getIface(idx uint32) (*syscall.NetlinkMessage, error) { | ||
| dat, err := syscall.NetlinkRIB(syscall.RTM_GETADDR, syscall.AF_UNSPEC) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| msgs, msgErr := syscall.ParseNetlinkMessage(dat) | ||
| if msgErr != nil { | ||
| return nil, msgErr | ||
| } | ||
|
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| ifaddrmsg := syscall.IfAddrmsg{} | ||
| for _, m := range msgs { | ||
| if m.Header.Type != syscall.RTM_NEWADDR { | ||
| continue | ||
| } | ||
| buf := bytes.NewBuffer(m.Data[:syscall.SizeofIfAddrmsg]) | ||
| if rerr := binary.Read(buf, binary.LittleEndian, &ifaddrmsg); rerr != nil { | ||
| continue | ||
| } | ||
| if ifaddrmsg.Index == idx { | ||
| return &m, nil | ||
| } | ||
| } | ||
|
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| return nil, errNoDefaultRoute | ||
| } |