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resolver: Resolve hostname to loopback address 

We don't currently support loopback adapters, but some ports were trying
to resolve it.
This commit is contained in:
Bananymous 2025-04-22 00:42:34 +03:00
parent 5c9710c78b
commit f467a9a309
1 changed files with 13 additions and 2 deletions
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15
userspace/programs/resolver/main.cpp
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@ -127,7 +127,7 @@ BAN::Optional<DNSResponse> read_dns_response(int socket)
DNSAnswer& answer = *reinterpret_cast<DNSAnswer*>(&reply.data[idx]); DNSAnswer& answer = *reinterpret_cast<DNSAnswer*>(&reply.data[idx]);
if (answer.type() != QTYPE::A) if (answer.type() != QTYPE::A)
{ {
dprintln("Not A record"); dprintln("Not A record, but {}", static_cast<uint16_t>(answer.type()));
return {}; return {};
} }
if (answer.data_len() != 4) if (answer.data_len() != 4)
@ -197,6 +197,10 @@ int main(int, char**)
{ {
srand(time(nullptr)); srand(time(nullptr));
char hostname[HOST_NAME_MAX];
if (gethostname(hostname, sizeof(hostname)) == -1)
hostname[0] = '\0';
int service_socket = create_service_socket(); int service_socket = create_service_socket();
if (service_socket == -1) if (service_socket == -1)
return 1; return 1;
@ -306,7 +310,14 @@ int main(int, char**)
BAN::Optional<DNSEntry> result; BAN::Optional<DNSEntry> result;
if (dns_cache.contains(*query)) if (*hostname && strcmp(query->data(), hostname) == 0)
{
result = DNSEntry {
.valid_until = time(nullptr),
.address = ntohl(INADDR_LOOPBACK),
};
}
else if (dns_cache.contains(*query))
{ {
auto& cached = dns_cache[*query]; auto& cached = dns_cache[*query];
if (time(nullptr) <= cached.valid_until) if (time(nullptr) <= cached.valid_until)