108 lines
2.4 KiB
Go
108 lines
2.4 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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//
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// networking_pasta_linux.go - Start pasta(1) for user-mode connectivity
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//
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// Copyright (c) 2022 Red Hat GmbH
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// Author: Stefano Brivio <sbrivio@redhat.com>
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package libpod
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import (
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"fmt"
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"os/exec"
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"strings"
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"github.com/sirupsen/logrus"
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)
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func (r *Runtime) setupPasta(ctr *Container, netns string) error {
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var NoTCPInitPorts = true
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var NoUDPInitPorts = true
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var NoTCPNamespacePorts = true
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var NoUDPNamespacePorts = true
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var NoMapGW = true
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path, err := r.config.FindHelperBinary("pasta", true)
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if err != nil {
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return fmt.Errorf("could not find pasta, the network namespace can't be configured: %w", err)
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}
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cmdArgs := []string{}
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cmdArgs = append(cmdArgs, "--config-net")
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for _, i := range ctr.convertPortMappings() {
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protocols := strings.Split(i.Protocol, ",")
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for _, protocol := range protocols {
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var addr string
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if i.HostIP != "" {
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addr = fmt.Sprintf("%s/", i.HostIP)
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}
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switch protocol {
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case "tcp":
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cmdArgs = append(cmdArgs, "-t")
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case "udp":
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cmdArgs = append(cmdArgs, "-u")
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case "default":
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return fmt.Errorf("can't forward protocol: %s", protocol)
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}
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arg := fmt.Sprintf("%s%d-%d:%d-%d", addr,
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i.HostPort,
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i.HostPort+i.Range-1,
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i.ContainerPort,
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i.ContainerPort+i.Range-1)
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cmdArgs = append(cmdArgs, arg)
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}
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}
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cmdArgs = append(cmdArgs, ctr.config.NetworkOptions["pasta"]...)
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for i, opt := range cmdArgs {
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switch opt {
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case "-t", "--tcp-ports":
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NoTCPInitPorts = false
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case "-u", "--udp-ports":
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NoUDPInitPorts = false
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case "-T", "--tcp-ns":
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NoTCPNamespacePorts = false
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case "-U", "--udp-ns":
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NoUDPNamespacePorts = false
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case "--map-gw":
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NoMapGW = false
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// not an actual pasta(1) option
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cmdArgs = append(cmdArgs[:i], cmdArgs[i+1:]...)
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}
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}
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if NoTCPInitPorts {
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cmdArgs = append(cmdArgs, "-t", "none")
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}
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if NoUDPInitPorts {
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cmdArgs = append(cmdArgs, "-u", "none")
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}
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if NoTCPNamespacePorts {
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cmdArgs = append(cmdArgs, "-T", "none")
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}
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if NoUDPNamespacePorts {
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cmdArgs = append(cmdArgs, "-U", "none")
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}
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if NoMapGW {
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cmdArgs = append(cmdArgs, "--no-map-gw")
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}
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cmdArgs = append(cmdArgs, "--netns", netns)
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logrus.Debugf("pasta arguments: %s", strings.Join(cmdArgs, " "))
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// pasta forks once ready, and quits once we delete the target namespace
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_, err = exec.Command(path, cmdArgs...).Output()
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if err != nil {
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return fmt.Errorf("failed to start pasta:\n%s",
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err.(*exec.ExitError).Stderr)
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}
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return nil
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}
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