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162 lines
5.9 KiB
162 lines
5.9 KiB
/*
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Copyright © 2020-2023 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 client
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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/netip"
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"regexp"
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goruntime "runtime"
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l "github.com/k3d-io/k3d/v5/pkg/logger"
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"github.com/k3d-io/k3d/v5/pkg/runtimes"
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"github.com/k3d-io/k3d/v5/pkg/runtimes/docker"
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k3d "github.com/k3d-io/k3d/v5/pkg/types"
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"github.com/k3d-io/k3d/v5/pkg/util"
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)
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type ResolveHostCmd struct {
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Cmd string
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LogMatcher *regexp.Regexp
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}
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var (
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ResolveHostCmdNSLookup = ResolveHostCmd{
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Cmd: "nslookup %s",
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LogMatcher: regexp.MustCompile(`^Address:\s+(?P<ip>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$`),
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}
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ResolveHostCmdGetEnt = ResolveHostCmd{
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Cmd: "getent ahostsv4 '%s'",
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LogMatcher: regexp.MustCompile(`(?P<ip>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\s+STREAM.+`), // e.g. `192.168.47.4 STREAM host.docker.internal`,
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}
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)
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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, runtime runtimes.Runtime, cluster *k3d.Cluster) (netip.Addr, error) {
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rtimeInfo, err := runtime.Info()
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if err != nil {
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return netip.Addr{}, err
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}
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l.Log().Tracef("GOOS: %s / Runtime OS: %s (%s)", goruntime.GOOS, rtimeInfo.OSType, rtimeInfo.OS)
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// Docker Runtime
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if runtime == runtimes.Docker {
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// Docker (for Desktop) on MacOS or Windows
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if docker.IsDockerDesktop(rtimeInfo.OS) {
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toolsNode, err := EnsureToolsNode(ctx, runtime, cluster)
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if err != nil {
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return netip.Addr{}, fmt.Errorf("failed to ensure that k3d-tools node is running to get host IP :%w", err)
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}
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k3dInternalIP, err := resolveHostnameFromInside(ctx, runtime, toolsNode, k3d.DefaultK3dInternalHostRecord, ResolveHostCmdGetEnt)
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if err == nil {
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return k3dInternalIP, nil
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}
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l.Log().Debugf("[GetHostIP on Docker Desktop] failed to resolve '%s' from inside the k3d-tools node: %v", k3d.DefaultK3dInternalHostRecord, err)
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dockerInternalIP, err := resolveHostnameFromInside(ctx, runtime, toolsNode, "host.docker.internal", ResolveHostCmdGetEnt)
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if err == nil {
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return dockerInternalIP, nil
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}
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l.Log().Debugf("[GetHostIP on Docker Desktop] failed to resolve 'host.docker.internal' from inside the k3d-tools node: %v", err)
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}
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// Colima
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if rtimeInfo.InfoName == "colima" {
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toolsNode, err := EnsureToolsNode(ctx, runtime, cluster)
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if err != nil {
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return netip.Addr{}, fmt.Errorf("failed to ensure that k3d-tools node is running to get host IP :%w", err)
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}
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limaIP, err := resolveHostnameFromInside(ctx, runtime, toolsNode, "host.lima.internal", ResolveHostCmdGetEnt)
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if err == nil {
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return limaIP, nil
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}
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l.Log().Debugf("[GetHostIP on colima] failed to resolve 'host.lima.internal' from inside the k3d-tools node: %v", err)
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}
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ip, err := runtime.GetHostIP(ctx, cluster.Network.Name)
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if err != nil {
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return netip.Addr{}, fmt.Errorf("runtime failed to get host IP: %w", err)
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}
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l.Log().Infof("HostIP: using network gateway %s address", ip)
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return ip, nil
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}
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// Catch all other runtime selections
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return netip.Addr{}, fmt.Errorf("GetHostIP only implemented for the docker runtime")
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}
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func resolveHostnameFromInside(ctx context.Context, rtime runtimes.Runtime, node *k3d.Node, hostname string, cmd ResolveHostCmd) (netip.Addr, error) {
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errPrefix := fmt.Errorf("error resolving hostname %s from inside node %s", hostname, node.Name)
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logreader, execErr := rtime.ExecInNodeGetLogs(ctx, node, []string{"sh", "-c", fmt.Sprintf(cmd.Cmd, hostname)})
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if logreader == nil {
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if execErr != nil {
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return netip.Addr{}, fmt.Errorf("%v: %w", errPrefix, execErr)
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}
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return netip.Addr{}, fmt.Errorf("%w: failed to get logs from exec process", errPrefix)
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}
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submatches := map[string]string{}
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scanner := bufio.NewScanner(logreader)
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if scanner == nil {
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if execErr != nil {
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return netip.Addr{}, fmt.Errorf("%v: %w", errPrefix, execErr)
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}
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return netip.Addr{}, fmt.Errorf("Failed to scan logs for host IP: Could not create scanner from logreader")
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}
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if scanner != nil && execErr != nil {
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l.Log().Debugln("Exec Process Failed, but we still got logs, so we're at least trying to get the IP from there...")
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l.Log().Tracef("-> Exec Process Error was: %+v", execErr)
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}
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for scanner.Scan() {
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l.Log().Tracef("Scanning Log Line '%s'", scanner.Text())
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match := cmd.LogMatcher.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(cmd.LogMatcher.SubexpNames(), match)
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l.Log().Tracef("-> Match(es): '%+v' -> Submatch(es): %+v", match, submatches)
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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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l.Log().Errorln(execErr)
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}
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return netip.Addr{}, fmt.Errorf("%w: failed to read address for '%s' from command output", errPrefix, hostname)
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}
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l.Log().Debugf("Hostname '%s' resolved to address '%s' inside node %s", hostname, submatches["ip"], node.Name)
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return netip.ParseAddr(submatches["ip"])
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}
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