const useTCPOnly … const useUDPOrTCP … const maxDNSPacketSize … var errLameReferral … var errCannotUnmarshalDNSMessage … var errCannotMarshalDNSMessage … var errServerMisbehaving … var errInvalidDNSResponse … var errNoAnswerFromDNSServer … var errServerTemporarilyMisbehaving … var netedns0 … func newRequest(q dnsmessage.Question, ad bool) (id uint16, udpReq, tcpReq []byte, err error) { … } func checkResponse(reqID uint16, reqQues dnsmessage.Question, respHdr dnsmessage.Header, respQues dnsmessage.Question) bool { … } func dnsPacketRoundTrip(c Conn, id uint16, query dnsmessage.Question, b []byte) (dnsmessage.Parser, dnsmessage.Header, error) { … } func dnsStreamRoundTrip(c Conn, id uint16, query dnsmessage.Question, b []byte) (dnsmessage.Parser, dnsmessage.Header, error) { … } // exchange sends a query on the connection and hopes for a response. func (r *Resolver) exchange(ctx context.Context, server string, q dnsmessage.Question, timeout time.Duration, useTCP, ad bool) (dnsmessage.Parser, dnsmessage.Header, error) { … } // checkHeader performs basic sanity checks on the header. func checkHeader(p *dnsmessage.Parser, h dnsmessage.Header) error { … } func skipToAnswer(p *dnsmessage.Parser, qtype dnsmessage.Type) error { … } // extractExtendedRCode extracts the extended RCode from the OPT resource (EDNS(0)) // If an OPT record is not found, the RCode from the hdr is returned. // Another return value indicates whether an additional resource was found. func extractExtendedRCode(p dnsmessage.Parser, hdr dnsmessage.Header) (dnsmessage.RCode, bool) { … } // Do a lookup for a single name, which must be rooted // (otherwise answer will not find the answers). func (r *Resolver) tryOneName(ctx context.Context, cfg *dnsConfig, name string, qtype dnsmessage.Type) (dnsmessage.Parser, string, error) { … } type resolverConfig … var resolvConf … func getSystemDNSConfig() *dnsConfig { … } // init initializes conf and is only called via conf.initOnce. func (conf *resolverConfig) init() { … } // tryUpdate tries to update conf with the named resolv.conf file. // The name variable only exists for testing. It is otherwise always // "/etc/resolv.conf". func (conf *resolverConfig) tryUpdate(name string) { … } func (conf *resolverConfig) tryAcquireSema() bool { … } func (conf *resolverConfig) releaseSema() { … } func (r *Resolver) lookup(ctx context.Context, name string, qtype dnsmessage.Type, conf *dnsConfig) (dnsmessage.Parser, string, error) { … } // avoidDNS reports whether this is a hostname for which we should not // use DNS. Currently this includes only .onion, per RFC 7686. See // golang.org/issue/13705. Does not cover .local names (RFC 6762), // see golang.org/issue/16739. func avoidDNS(name string) bool { … } // nameList returns a list of names for sequential DNS queries. func (conf *dnsConfig) nameList(name string) []string { … } type hostLookupOrder … const hostLookupCgo … const hostLookupFilesDNS … const hostLookupDNSFiles … const hostLookupFiles … const hostLookupDNS … var lookupOrderName … func (o hostLookupOrder) String() string { … } func (r *Resolver) goLookupHostOrder(ctx context.Context, name string, order hostLookupOrder, conf *dnsConfig) (addrs []string, err error) { … } // lookup entries from /etc/hosts func goLookupIPFiles(name string) (addrs []IPAddr, canonical string) { … } // goLookupIP is the native Go implementation of LookupIP. // The libc versions are in cgo_*.go. func (r *Resolver) goLookupIP(ctx context.Context, network, host string, order hostLookupOrder, conf *dnsConfig) (addrs []IPAddr, err error) { … } func (r *Resolver) goLookupIPCNAMEOrder(ctx context.Context, network, name string, order hostLookupOrder, conf *dnsConfig) (addrs []IPAddr, cname dnsmessage.Name, err error) { … } // goLookupCNAME is the native Go (non-cgo) implementation of LookupCNAME. func (r *Resolver) goLookupCNAME(ctx context.Context, host string, order hostLookupOrder, conf *dnsConfig) (string, error) { … } // goLookupPTR is the native Go implementation of LookupAddr. func (r *Resolver) goLookupPTR(ctx context.Context, addr string, order hostLookupOrder, conf *dnsConfig) ([]string, error) { … }
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