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IP connection level system calls are not supported on Windows.
On Windows, we cannot do low level operations like setting control message or reading control message from the connections. Creating a different file for Windows with limited functionality. Test failures: http://screen/yznZGqOdB6G PiperOrigin-RevId: 329998928
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| // Copyright 2017-2020 Google Inc. | ||
| // | ||
| // 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. | ||
|
|
||
| // +build !windows | ||
|
|
||
| package udp | ||
|
|
||
| import ( | ||
| "io" | ||
| "net" | ||
|
|
||
| "github.com/google/cloudprober/logger" | ||
| "golang.org/x/net/ipv4" | ||
| "golang.org/x/net/ipv6" | ||
| ) | ||
|
|
||
| func readAndEcho(conn *net.UDPConn, l *logger.Logger) { | ||
| // TODO(manugarg): We read and echo back only 4098 bytes. We should look at raising this | ||
| // limit or making it configurable. Also of note, ReadFromUDP reads a single UDP datagram | ||
| // (up to the max size of 64K-sizeof(UDPHdr)) and discards the rest. | ||
| buf := make([]byte, 4098) | ||
|
|
||
| // We use an IPv6 connection wrapper to receive both IPv4 and IPv6 packets. | ||
| // ipv6.PacketConn lets us use control messages to: | ||
| // -- receive packet destination IP (FlagDst) | ||
| // -- set source IP (Src). | ||
| p6 := ipv6.NewPacketConn(conn) | ||
| if err := p6.SetControlMessage(ipv6.FlagDst, true); err != nil { | ||
| l.Error("error running SetControlMessage(FlagDst): ", err.Error()) | ||
| return | ||
| } | ||
|
|
||
| // ipv6.PacketConn also receives IPv4 packets. | ||
| len, cm, addr, err := p6.ReadFrom(buf) | ||
| if err != nil { | ||
| l.Errorf("ReadFrom(): %v", err) | ||
| return | ||
| } | ||
|
|
||
| var n int | ||
| if cm.Dst.To4() != nil { | ||
| // We have a v4 packet, use an ipv4.PacketConn for sending. | ||
| p4 := ipv4.NewPacketConn(conn) | ||
| wcm := &ipv4.ControlMessage{ | ||
| Src: cm.Dst.To4(), | ||
| } | ||
| n, err = p4.WriteTo(buf[:len], wcm, addr) | ||
| } else { | ||
| // We have a v6 packet. | ||
| wcm := &ipv6.ControlMessage{ | ||
| Src: cm.Dst.To16(), | ||
| } | ||
| n, err = p6.WriteTo(buf[:len], wcm, addr) | ||
| } | ||
|
|
||
| if err == io.EOF { | ||
| return | ||
| } | ||
| if err != nil { | ||
| l.Errorf("WriteTo(): %v", err) | ||
| return | ||
| } | ||
| if n < len { | ||
| l.Warningf("Reply truncated! Got %v bytes but only sent %v bytes", len, n) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| // Copyright 2017-2020 Google Inc. | ||
| // | ||
| // 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. | ||
|
|
||
| // +build windows | ||
|
|
||
| package udp | ||
|
|
||
| import ( | ||
| "io" | ||
| "net" | ||
|
|
||
| "github.com/google/cloudprober/logger" | ||
| ) | ||
|
|
||
| func readAndEcho(conn *net.UDPConn, l *logger.Logger) { | ||
| // TODO(manugarg): We read and echo back only 4098 bytes. We should look at raising this | ||
| // limit or making it configurable. Also of note, ReadFromUDP reads a single UDP datagram | ||
| // (up to the max size of 64K-sizeof(UDPHdr)) and discards the rest. | ||
| buf := make([]byte, 4098) | ||
| len, addr, err := conn.ReadFromUDP(buf) | ||
| if err != nil { | ||
| l.Errorf("ReadFromUDP: %v", err) | ||
| return | ||
| } | ||
|
|
||
| n, err := conn.WriteToUDP(buf[:len], addr) | ||
| if err == io.EOF { | ||
| return | ||
| } | ||
| if err != nil { | ||
| l.Errorf("WriteToUDP: %v", err) | ||
| return | ||
| } | ||
| if n < len { | ||
| l.Warningf("Reply truncated! Got %v bytes but only sent %v bytes", len, n) | ||
| } | ||
| } |