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Code Issues Releases Wiki Activity

Fix panic: index out of range (#727)

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Loyalsoldier 2021-03-03 16:53:42 +08:00 committed by GitHub
parent 733c5dea88
commit 45740be4af
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 17 additions and 7 deletions
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7
app/dns/dns.go
View File

@ -66,9 +66,6 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
for _, ns := range config.NameServer {
domainRuleCount += len(ns.PrioritizedDomain)
}
// Fixes https://github.com/v2fly/v2ray-core/issues/529
// Compatible with `localhost` nameserver specified in config file
domainRuleCount += len(localTLDsAndDotlessDomains)
// MatcherInfos is ensured to cover the maximum index domainMatcher could return, where matcher's index starts from 1
matcherInfos := make([]DomainMatcherInfo, domainRuleCount+1)
@ -86,7 +83,7 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
for _, ns := range config.NameServer {
clientIdx := len(clients)
updateDomain := func(domainRule strmatcher.Matcher, originalRuleIdx int) error {
updateDomain := func(domainRule strmatcher.Matcher, originalRuleIdx int, matcherInfos []DomainMatcherInfo) error {
midx := domainMatcher.Add(domainRule)
matcherInfos[midx] = DomainMatcherInfo{
clientIdx: uint16(clientIdx),
@ -100,7 +97,7 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
case net.IPv4len, net.IPv6len:
myClientIP = net.IP(ns.ClientIp)
}
client, err := NewClient(ctx, ns, myClientIP, geoipContainer, updateDomain)
client, err := NewClient(ctx, ns, myClientIP, geoipContainer, &matcherInfos, updateDomain)
if err != nil {
return nil, newError("failed to create client").Base(err)
}

17
app/dns/nameserver.go
View File

@ -65,7 +65,7 @@ func NewServer(dest net.Destination, dispatcher routing.Dispatcher) (Server, err
}
// NewClient creates a DNS client managing a name server with client IP, domain rules and expected IPs.
func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container router.GeoIPMatcherContainer, updateDomainRule func(strmatcher.Matcher, int) error) (*Client, error) {
func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container router.GeoIPMatcherContainer, matcherInfos *[]DomainMatcherInfo, updateDomainRule func(strmatcher.Matcher, int, []DomainMatcherInfo) error) (*Client, error) {
client := &Client{}
err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error {
// Create a new server for each client for now
@ -78,6 +78,19 @@ func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container r
if _, isLocalDNS := server.(*LocalNameServer); isLocalDNS {
ns.PrioritizedDomain = append(ns.PrioritizedDomain, localTLDsAndDotlessDomains...)
ns.OriginalRules = append(ns.OriginalRules, localTLDsAndDotlessDomainsRule)
// The following lines is a solution to avoid core panics（rule index out of range） when setting `localhost` DNS client in config.
// Because the `localhost` DNS client will apend len(localTLDsAndDotlessDomains) rules into matcherInfos to match `geosite:private` default rule.
// But `matcherInfos` has no enough length to add rules, which leads to core panics (rule index out of range).
// To avoid this, the length of `matcherInfos` must be equal to the expected, so manually append it with Golang default zero value first for later modification.
// Related issues:
// https://github.com/v2fly/v2ray-core/issues/529
// https://github.com/v2fly/v2ray-core/issues/719
for i := 0; i < len(localTLDsAndDotlessDomains); i++ {
*matcherInfos = append(*matcherInfos, DomainMatcherInfo{
clientIdx: uint16(0),
domainRuleIdx: uint16(0),
})
}
}
// Establish domain rules
@ -104,7 +117,7 @@ func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container r
rules = append(rules, domainRule.String())
ruleCurr++
}
err = updateDomainRule(domainRule, originalRuleIdx)
err = updateDomainRule(domainRule, originalRuleIdx, *matcherInfos)
if err != nil {
return newError("failed to create prioritized domain").Base(err).AtWarning()
}