hare

commit 31a916a6dd69bd47821a2f05a2aa52e7eb2cdf51
parent f6d7bf79b46543c47c48a88457fd38e67bc3257c
Author: Drew DeVault <sir@cmpwn.com>
Date:   Mon, 21 Jun 2021 12:00:23 -0400

net::dns: use system nameservers in query

Signed-off-by: Drew DeVault <sir@cmpwn.com>

Diffstat:
M
net/dns/query.ha
 | 
19
+++++++++++++++++--

1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/net/dns/query.ha b/net/dns/query.ha
@@ -1,16 +1,31 @@
 use net::ip;
 use net::udp;
+use unix::resolvconf;
+
+let defaults: []ip::addr = [];
+
+@fini fn fini() void = {
+	free(defaults);
+};
 
 // Performs a DNS query using the provided list of DNS servers. The caller must
-// free the return value with [[message_free]].
+// free the return value with [[message_free]]. If no DNS servers are provided,
+// the system defaults (if any) are used.
 export fn query(query: *message, addr: ip::addr...) (*message | error) = {
-	assert(len(addr) == 1, "TODO: Query multiple servers");
+	if (len(addr) == 0) {
+		if (len(defaults) == 0) {
+			defaults = resolvconf::load();
+		};
+		addr = defaults;
+	};
+
 	let socket = udp::listen(ip::ANY_V4, 0)?;
 	defer udp::close(socket);
 
 	// TODO: Use TCP for messages >512 bytes
 	let sendbuf: [512]u8 = [0...];
 	let z = encode(sendbuf, query);
+	// TODO: Query multiple servers
 	udp::sendto(socket, sendbuf[..z], addr[0], 53)?;
 
 	let recvbuf: [512]u8 = [0...];