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/*
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Copyright © 2020 The k3d Author(s)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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package cluster
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import (
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"bufio"
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"context"
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"fmt"
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"net"
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"regexp"
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"runtime"
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rt "github.com/rancher/k3d/v3/pkg/runtimes"
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k3d "github.com/rancher/k3d/v3/pkg/types"
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"github.com/rancher/k3d/v3/pkg/util"
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log "github.com/sirupsen/logrus"
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)
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var nsLookupAddressRegexp = regexp.MustCompile(`^Address:\s+(?P<ip>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$`)
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// GetHostIP returns the routable IP address to be able to access services running on the host system from inside the cluster.
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// This depends on the Operating System and the chosen Runtime.
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func GetHostIP(ctx context.Context, rtime rt.Runtime, cluster *k3d.Cluster) (net.IP, error) {
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// Docker Runtime
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if rtime == rt.Docker {
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log.Debugf("Runtime GOOS: %s", runtime.GOOS)
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// "native" Docker on Linux
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if runtime.GOOS == "linux" {
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ip, err := rtime.GetHostIP(ctx, cluster.Network.Name)
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if err != nil {
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return nil, err
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}
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return ip, nil
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}
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// Docker (for Desktop) on MacOS or Windows
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if runtime.GOOS == "windows" || runtime.GOOS == "darwin" {
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ip, err := resolveHostnameFromInside(ctx, rtime, cluster.Nodes[0], "host.docker.internal")
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if err != nil {
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return nil, err
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}
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return ip, nil
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}
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// Catch all other GOOS cases
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return nil, fmt.Errorf("GetHostIP only implemented for Linux, MacOS (Darwin) and Windows")
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}
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// Catch all other runtime selections
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return nil, fmt.Errorf("GetHostIP only implemented for the docker runtime")
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}
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func resolveHostnameFromInside(ctx context.Context, rtime rt.Runtime, node *k3d.Node, hostname string) (net.IP, error) {
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logreader, execErr := rtime.ExecInNodeGetLogs(ctx, node, []string{"sh", "-c", fmt.Sprintf("nslookup %s", hostname)})
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submatches := map[string]string{}
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scanner := bufio.NewScanner(logreader)
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for scanner.Scan() {
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match := nsLookupAddressRegexp.FindStringSubmatch(scanner.Text())
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if len(match) == 0 {
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continue
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}
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submatches = util.MapSubexpNames(nsLookupAddressRegexp.SubexpNames(), match)
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break
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}
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if _, ok := submatches["ip"]; !ok {
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if execErr != nil {
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log.Errorln(execErr)
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}
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return nil, fmt.Errorf("Failed to read address for '%s' from nslookup response", hostname)
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}
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log.Debugf("Hostname '%s' -> Address '%s'", hostname, submatches["ip"])
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return net.ParseIP(submatches["ip"]), nil
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}
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