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https://github.com/edgelesssys/constellation.git
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bd63aa3c6b
sed -i '1i/*\nCopyright (c) Edgeless Systems GmbH\n\nSPDX-License-Identifier: AGPL-3.0-only\n*/\n' `grep -rL --include='*.go' 'DO NOT EDIT'` gofumpt -w .
51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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package iproute
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import (
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"context"
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"errors"
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"fmt"
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"os/exec"
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"strings"
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)
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// AddToLocalRoutingTable adds the IP to the local routing table.
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func AddToLocalRoutingTable(ctx context.Context, ip string) error {
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return manipulateLocalRoutingTable(ctx, "add", ip)
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}
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// RemoveFromLocalRoutingTable removes the IPfrom the local routing table.
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func RemoveFromLocalRoutingTable(ctx context.Context, ip string) error {
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return manipulateLocalRoutingTable(ctx, "del", ip)
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}
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func manipulateLocalRoutingTable(ctx context.Context, action string, ip string) error {
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// https://github.com/GoogleCloudPlatform/guest-agent/blob/792fce795218633bcbde505fb3457a0b24f26d37/google_guest_agent/addresses.go#L179
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if !strings.Contains(ip, "/") {
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ip = ip + "/32"
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}
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args := []string{"route", action, "to", "local", ip, "scope", "host", "dev", "ens3", "proto", "66"}
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_, err := exec.CommandContext(ctx, "ip", args...).Output()
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if err == nil {
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return nil
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}
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var exitErr *exec.ExitError
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if !errors.As(err, &exitErr) {
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return fmt.Errorf("ip route %s: %w", action, err)
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}
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if exitErr.ExitCode() == 2 {
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// "RTNETLINK answers: File exists" or "RTNETLINK answers: No such process"
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//
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// Ignore, expected in case of adding an existing route or deleting a route
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// that does not exist.
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return nil
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}
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return fmt.Errorf("ip route %s (code %v) with: %s", action, exitErr.ExitCode(), exitErr.Stderr)
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}
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