mirror of
https://github.com/safing/portmaster
synced 2025-09-01 18:19:12 +00:00
a5e3f7ff37
Refactor the status package to use portbase/runtime and make system status readonly. Also adapts the code base to the new portbase/notifications package.
90 lines
2 KiB
Go
90 lines
2 KiB
Go
package nameserver
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import (
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"fmt"
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"net"
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"os"
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"time"
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"github.com/safing/portbase/log"
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"github.com/safing/portbase/modules"
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"github.com/safing/portbase/notifications"
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"github.com/safing/portmaster/network/packet"
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"github.com/safing/portmaster/network/state"
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)
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var (
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otherResolverIPs = []net.IP{
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net.IPv4(127, 0, 0, 1), // default
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net.IPv4(127, 0, 0, 53), // some resolvers on Linux
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}
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)
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func checkForConflictingService() error {
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var pid int
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var err error
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// check multiple IPs for other resolvers
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for _, resolverIP := range otherResolverIPs {
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pid, err = takeover(resolverIP)
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if err == nil && pid != 0 {
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break
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}
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}
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// handle returns
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if err != nil {
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log.Infof("nameserver: could not stop conflicting service: %s", err)
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// leave original service-worker error intact
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return nil
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}
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if pid == 0 {
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// no conflicting service identified
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return nil
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}
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// we killed something!
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// wait for a short duration for the other service to shut down
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time.Sleep(10 * time.Millisecond)
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notifications.NotifyInfo(
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"namserver-stopped-conflicting-service",
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fmt.Sprintf("Portmaster stopped a conflicting name service (pid %d) to gain required system integration.", pid),
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)
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// restart via service-worker logic
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return fmt.Errorf("%w: stopped conflicting name service with pid %d", modules.ErrRestartNow, pid)
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}
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func takeover(resolverIP net.IP) (int, error) {
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pid, _, err := state.Lookup(&packet.Info{
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Inbound: true,
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Version: 0, // auto-detect
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Protocol: packet.UDP,
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Src: nil, // do not record direction
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SrcPort: 0, // do not record direction
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Dst: resolverIP,
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DstPort: 53,
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})
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if err != nil {
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// there may be nothing listening on :53
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return 0, nil
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}
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proc, err := os.FindProcess(pid)
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if err != nil {
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// huh. gone already? I guess we'll wait then...
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return 0, err
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}
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err = proc.Signal(os.Interrupt)
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if err != nil {
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err = proc.Kill()
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if err != nil {
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log.Errorf("nameserver: failed to stop conflicting service (pid %d): %s", pid, err)
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return 0, err
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}
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}
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return pid, nil
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}
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