phantom/bitcoin
1
0
Fork 0
mirror of https://github.com/bitcoin/bitcoin.git synced 2025-01-25 02:33:24 -03:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

net: Allow DNS lookups on nodes with IPV6 lo only

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

13
src/netbase.cpp
View file

@ -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.