From 38d9ea07370dcd75e68e9c70898789cf6016da51 Mon Sep 17 00:00:00 2001
From: Michael Schmoock <michael@schmoock.net>
Date: Thu, 7 Oct 2021 13:01:05 +0200
Subject: [PATCH] wip: resolve

---
 connectd/connectd.c | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/connectd/connectd.c b/connectd/connectd.c
index 43bb12248f63..ab5c8aa0376c 100644
--- a/connectd/connectd.c
+++ b/connectd/connectd.c
@@ -788,6 +788,8 @@ static void try_connect_one_addr(struct connecting *connect)
 	bool use_proxy = connect->daemon->always_use_proxy;
 	const struct wireaddr_internal *addr = &connect->addrs[connect->addrnum];
 	struct io_conn *conn;
+	struct addrinfo hints, *ais, *aii;
+	int gai_err;
 
 	/* In case we fail without a connection, make destroy_io_conn happy */
 	connect->conn = NULL;
@@ -836,7 +838,37 @@ static void try_connect_one_addr(struct connecting *connect)
 			af = AF_INET6;
 			break;
 		case ADDR_TYPE_DNS:
-			// TODO: resolve with getaddrinfo and set af
+			/* Resolve with getaddrinfo */
+			memset(&hints, 0, sizeof(hints));
+			hints.ai_socktype = SOCK_STREAM;
+			hints.ai_family = AF_UNSPEC;
+			hints.ai_protocol = 0;
+			hints.ai_flags = AI_ADDRCONFIG;
+			gai_err = getaddrinfo((char *)addr->u.wireaddr.addr,
+					      tal_fmt(tmpctx, "%d",
+						      addr->u.wireaddr.port),
+					      &hints, &ais);
+			if (gai_err != 0)
+				status_failed(STATUS_FAIL_INTERNAL_ERROR,
+					      gai_strerror(gai_err));
+			for (aii = ais; aii; aii = aii->ai_next) {
+				// TODO: if we get IPv4 and IPv6 we should try both
+				if (aii->ai_family == AF_INET) {
+					af = AF_INET;
+					break;
+				}
+				if (aii->ai_family == AF_INET6) {
+					af = AF_INET6;
+					break;
+				}
+				// TODO: how to tell io_new_conn the correct ip?
+				// it also uses addr = &connect->addrs[connect->addrnum];
+				//memcpy(&ai, aii, sizeof(struct addrinfo));
+				//freeaddrinfo(ais);
+				//return ai;
+			}
+			freeaddrinfo(ais);
+			// TODO: handle no suitable ai_family found
 			break;
 		}
 	}