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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| // For reference: | ||
| // https://github.com/projectcalico/calico/blob/master/node/pkg/lifecycle/startup/autodetection/reachaddr.go | ||
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|
||
| // Copyright (c) 2017 Tigera, Inc. All rights reserved. | ||
| // | ||
| // 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. | ||
| package autodetection | ||
|
|
||
| import ( | ||
| "fmt" | ||
| gonet "net" | ||
|
|
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| "github.com/projectcalico/calico/libcalico-go/lib/net" | ||
| log "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
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| // ReachDestination auto-detects the interface Network by setting up a UDP | ||
| // connection to a "reach" destination. | ||
| func ReachDestination(dest string, version int) (*Interface, *net.IPNet, error) { | ||
| log.Debugf("Auto-detecting IPv%d CIDR by reaching destination %s", version, dest) | ||
|
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| // Open a UDP connection to determine which external IP address is | ||
| // used to access the supplied destination. | ||
| protocol := fmt.Sprintf("udp%d", version) | ||
| address := fmt.Sprintf("[%s]:80", dest) | ||
| conn, err := gonet.Dial(protocol, address) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| defer conn.Close() // nolint: errcheck | ||
|
|
||
| // Get the local address as a golang IP and use that to find the matching | ||
| // interface CIDR. | ||
| addr := conn.LocalAddr() | ||
| if addr == nil { | ||
| return nil, nil, fmt.Errorf("no address detected by connecting to %s", dest) | ||
| } | ||
| udpAddr := addr.(*gonet.UDPAddr) | ||
| log.WithFields(log.Fields{"IP": udpAddr.IP, "Destination": dest}).Info("Auto-detected address by connecting to remote") | ||
|
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||
| // Get a full list of interface and IPs and find the CIDR matching the | ||
| // found IP. | ||
| ifaces, err := GetInterfaces(gonet.Interfaces, nil, nil, version) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| for _, iface := range ifaces { | ||
| log.WithField("Name", iface.Name).Debug("Checking interface CIDRs") | ||
| for _, cidr := range iface.Cidrs { | ||
| log.WithField("CIDR", cidr.String()).Debug("Checking CIDR") | ||
| if cidr.IP.Equal(udpAddr.IP) { | ||
| log.WithField("CIDR", cidr.String()).Debug("Found matching interface CIDR") | ||
| return &iface, &cidr, nil | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return nil, nil, fmt.Errorf("autodetected IPv%d address does not match any addresses found on local interfaces: %s", version, udpAddr.IP.String()) | ||
| } |
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