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net: Allow DNS lookups on nodes with IPV6 lo only

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AI_ADDRCONFIG prevents ::1 from being considered a valid address on hosts that have a IPV6 loopback IP address but no other IPV6 interfaces.
This commit is contained in:
Max Edwards
2024-06-07 13:24:04 +01:00
parent 4a020ca443
commit 23333b7ed2
1 changed files with 12 additions and 1 deletions
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13
src/netbase.cpp
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@@ -48,6 +48,7 @@ std::vector<CNetAddr> WrappedGetAddrInfo(const std::string& name, bool allow_loo
ai_hint.ai_protocol = IPPROTO_TCP;
// We don't care which address family (IPv4 or IPv6) is returned
ai_hint.ai_family = AF_UNSPEC;
// If we allow lookups of hostnames, use the AI_ADDRCONFIG flag to only
// return addresses whose family we have an address configured for.
//
@@ -59,7 +60,17 @@ std::vector<CNetAddr> WrappedGetAddrInfo(const std::string& name, bool allow_loo
addrinfo* ai_res{nullptr};
const int n_err{getaddrinfo(name.c_str(), nullptr, &ai_hint, &ai_res)};
if (n_err != 0) {
return {};
if ((ai_hint.ai_flags & AI_ADDRCONFIG) == AI_ADDRCONFIG) {
// AI_ADDRCONFIG on some systems may exclude loopback-only addresses
// If first lookup failed we perform a second lookup without AI_ADDRCONFIG
ai_hint.ai_flags = (ai_hint.ai_flags & ~AI_ADDRCONFIG);
const int n_err_retry{getaddrinfo(name.c_str(), nullptr, &ai_hint, &ai_res)};
if (n_err_retry != 0) {
return {};
}
} else {
return {};
}
}
// Traverse the linked list starting with ai_trav.