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wgengine/router: also accept exit code 254 from ip rule del.

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iproute2 3.16.0-2 from Debian Jessie (oldoldstable) doesn't return
exit code 2 when deleting a non-existent IP rule.

Fixes #434

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson 2020-06-03 19:36:40 +00:00 committed by Dave Anderson
parent 484b7fc9a3
commit 5a32f8e181
2 changed files with 19 additions and 6 deletions
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7
wgengine/router/router_linux.go
View File

@ -519,7 +519,7 @@ func (r *linuxRouter) addIPRules() error {
return err
}
rg := newRunGroup(0, r.cmd)
rg := newRunGroup(nil, r.cmd)
// NOTE(apenwarr): We leave spaces between each pref number.
// This is so the sysadmin can override by inserting rules in
@ -588,7 +588,10 @@ func (r *linuxRouter) delIPRules() error {
// Error codes: 'ip rule' returns error code 2 if the rule is a
// duplicate (add) or not found (del). It returns a different code
// for syntax errors. This is also true of busybox.
rg := newRunGroup(2, r.cmd)
//
// Some older versions of iproute2 also return error code 254 for
// unknown rules during deletion.
rg := newRunGroup([]int{2, 254}, r.cmd)
// When deleting rules, we want to be a bit specific (mention which
// table we were routing to) but not *too* specific (fwmarks, etc).

18
wgengine/router/runner.go
View File

@ -61,21 +61,31 @@ func (o osCommandRunner) output(args ...string) ([]byte, error) {
}
type runGroup struct {
OkCode int // an error code that is acceptable, other than 0, if any
OkCode []int // error codes that are acceptable, other than 0, if any
Runner commandRunner // the runner that actually runs our commands
ErrAcc error // first error encountered, if any
}
func newRunGroup(okCode int, runner commandRunner) *runGroup {
func newRunGroup(okCode []int, runner commandRunner) *runGroup {
return &runGroup{
OkCode: okCode,
Runner: runner,
}
}
func (rg *runGroup) okCode(err error) bool {
got := errCode(err)
for _, want := range rg.OkCode {
if got == want {
return true
}
}
return false
}
func (rg *runGroup) Output(args ...string) []byte {
b, err := rg.Runner.output(args...)
if rg.ErrAcc == nil && err != nil && errCode(err) != rg.OkCode {
if rg.ErrAcc == nil && err != nil && !rg.okCode(err) {
rg.ErrAcc = err
}
return b
@ -83,7 +93,7 @@ func (rg *runGroup) Output(args ...string) []byte {
func (rg *runGroup) Run(args ...string) {
err := rg.Runner.run(args...)
if rg.ErrAcc == nil && err != nil && errCode(err) != rg.OkCode {
if rg.ErrAcc == nil && err != nil && !rg.okCode(err) {
rg.ErrAcc = err
}
}