- Replace hardcoded 127.0.0.1:53 in systemResolver() with actual system
DNS from /etc/resolv.conf (falls back to 127.0.0.1:53 if unavailable)
- Add Resolver field to RootDiscoveryConfig so callers can override the
upstream resolver used during root server discovery
- Add --dns-upstream flag (e.g. --dns-upstream 8.8.8.8:53) to exploredns
CLI and DNSUpstream field to Config
- Add internal/dns/hints.go with all 13 IANA root server IPv4/IPv6
addresses as embedded constants (RootHints []RootServer)
- Update tests: fix real_exchange_test.go call site; add hints_test.go
covering RootHints correctness and resolver helper functions
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: multica-agent <github@multica.ai>
Add RootServer struct and DiscoverRoots function that queries the local
resolver for NS records of the root zone, resolves each root name to
A/AAAA addresses, and returns a list of RootServer structs.
Supports:
- Default: discovers a single root server from local resolver
- --root-server override to target a specific root server
- --all-root-servers to discover all 13 root servers
- --root-aaaa flag to include IPv6 addresses
Includes unit tests for all helper functions and integration tests
that skip gracefully when no resolver is available.
Co-authored-by: multica-agent <github@multica.ai>
