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https://github.com/ipfs/kubo.git
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541bd657a6
adds DNS.OverrideSystem flag (enabled by default) that extends DNS.Resolvers to affect all DNS lookups in the daemon process, not just DNSLink and Multiaddr resolution. this ensures AutoTLS ACME DNS-01 challenge verification, HTTP retrieval, and third-party library code all respect DNS.Resolvers config. implementation creates a net.Resolver bridge that intercepts DNS wire protocol queries, parses them with miekg/dns, calls madns.Resolver, and returns properly formatted DNS responses. note: this is an exploration of daemon-wide DNS configuration without refactoring boxo/gateway. a cleaner future approach may create native net.Resolver from config first, then convert to madns only for go-libp2p.
44 lines
1.3 KiB
Go
44 lines
1.3 KiB
Go
package node
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import (
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"math"
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"net"
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"time"
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"github.com/ipfs/boxo/gateway"
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config "github.com/ipfs/kubo/config"
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"github.com/ipfs/kubo/core/node/libp2p"
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doh "github.com/libp2p/go-doh-resolver"
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madns "github.com/multiformats/go-multiaddr-dns"
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"go.uber.org/fx"
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)
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func DNSResolver(cfg *config.Config) (*madns.Resolver, error) {
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var dohOpts []doh.Option
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if !cfg.DNS.MaxCacheTTL.IsDefault() {
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dohOpts = append(dohOpts, doh.WithMaxCacheTTL(cfg.DNS.MaxCacheTTL.WithDefault(time.Duration(math.MaxUint32)*time.Second)))
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}
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// Replace "auto" DNS resolver placeholders with autoconf values
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resolvers := cfg.DNSResolversWithAutoConf()
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return gateway.NewDNSResolver(resolvers, dohOpts...)
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}
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// OverrideDefaultResolver replaces net.DefaultResolver with one that uses
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// the provided madns.Resolver. This ensures all Go code in the daemon
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// (including third-party libraries like p2p-forge/client) respects the
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// DNS.Resolvers configuration.
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func OverrideDefaultResolver(resolver *madns.Resolver) {
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net.DefaultResolver = libp2p.NewNetResolverFromMadns(resolver)
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}
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// maybeOverrideDefaultResolver returns an fx.Option that conditionally
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// invokes OverrideDefaultResolver based on the DNS.OverrideSystem config flag.
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func maybeOverrideDefaultResolver(enabled bool) fx.Option {
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if enabled {
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return fx.Invoke(OverrideDefaultResolver)
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}
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return fx.Options()
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}
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