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ignore ipv6 addresses from defaultRouteIP, guard against using ipv6 address as v4 default

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Alex
2025-02-13 22:55:57 -05:00
committed by Cuong Manh Le
parent 7929aafe2a
commit 0123ca44fb
1 changed files with 23 additions and 1 deletions
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24
cmd/cli/dns_proxy.go
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@@ -1262,6 +1262,13 @@ func (p *prog) monitorNetworkChanges(ctx context.Context) error {
// Get IPs from default route interface in new state
selfIP := defaultRouteIP()
// Ensure that selfIP is an IPv4 address.
// If defaultRouteIP mistakenly returns an IPv6 (such as a ULA), clear it
if ip := net.ParseIP(selfIP); ip != nil && ip.To4() == nil {
mainLog.Load().Debug().Msgf("defaultRouteIP returned a non-IPv4 address: %s, ignoring it", selfIP)
selfIP = ""
}
var ipv6 string
if delta.New.DefaultRouteInterface != "" {
@@ -1297,7 +1304,8 @@ func (p *prog) monitorNetworkChanges(ctx context.Context) error {
}
}
if ip := net.ParseIP(selfIP); ip != nil {
// Only set the IPv4 default if selfIP is a valid IPv4 address.
if ip := net.ParseIP(selfIP); ip != nil && ip.To4() != nil {
ctrld.SetDefaultLocalIPv4(ip)
if !isMobile() && p.ciTable != nil {
p.ciTable.SetSelfIP(selfIP)
@@ -1507,12 +1515,14 @@ func (p *prog) waitForUpstreamRecovery(ctx context.Context, upstreams map[string
go func(name string, uc *ctrld.UpstreamConfig) {
defer wg.Done()
mainLog.Load().Debug().Msgf("Starting recovery check loop for upstream: %s", name)
attempts := 0
for {
select {
case <-ctx.Done():
mainLog.Load().Debug().Msgf("Context canceled for upstream %s", name)
return
default:
attempts++
// checkUpstreamOnce will reset any failure counters on success.
if err := p.checkUpstreamOnce(name, uc); err == nil {
mainLog.Load().Debug().Msgf("Upstream %s recovered successfully", name)
@@ -1526,6 +1536,18 @@ func (p *prog) waitForUpstreamRecovery(ctx context.Context, upstreams map[string
}
mainLog.Load().Debug().Msgf("Upstream %s check failed, sleeping before retry", name)
time.Sleep(checkUpstreamBackoffSleep)
// if this is the upstreamOS and it's the 3rd attempt (or multiple of 3),
// we should try to reinit the OS resolver to ensure we can recover
if name == upstreamOS && attempts%3 == 0 {
mainLog.Load().Debug().Msgf("UpstreamOS check failed on attempt %d, reinitializing OS resolver", attempts)
ns := ctrld.InitializeOsResolver(true)
if len(ns) == 0 {
mainLog.Load().Warn().Msg("No nameservers found for OS resolver; using existing values")
} else {
mainLog.Load().Info().Msgf("Reinitialized OS resolver with nameservers: %v", ns)
}
}
}
}
}(name, uc)