http/client: support dns ipv6 as fallback

baresip · Aug 17, 2021 · 0f70aa0 · 0f70aa0
1 parent 8808434
commit 0f70aa0
Showing 1 changed file with 21 additions and 4 deletions.
diff --git a/src/http/client.c b/src/http/client.c
@@ -76,6 +76,7 @@ struct http_req {
 	bool chunked;
 	bool secure;
 	bool close;
+	bool ipv6fb;
 };
 
 
@@ -584,9 +585,24 @@ static void query_handler(int err, const struct dnshdr *hdr, struct list *ansl,
 
 	dns_rrlist_apply2(ansl, req->host, DNS_TYPE_A, DNS_TYPE_AAAA,
 			  DNS_CLASS_IN, true, rr_handler, req);
+
 	if (req->srvc == 0) {
-		err = err ? err : EDESTADDRREQ;
-		goto fail;
+#ifdef HAVE_INET6
+		if (req->ipv6fb) {
+			req->ipv6fb = false;
+			err = dnsc_query(&req->dq, req->cli->dnsc, req->host,
+					DNS_TYPE_AAAA, DNS_CLASS_IN, true,
+					query_handler, req);
+			if (err)
+				goto fail;
+			return;
+		}
+		else
+#endif
+		{
+			err = err ? err : EDESTADDRREQ;
+			goto fail;
+		}
 	}
 
 	err = req_connect(req);
@@ -782,11 +798,12 @@ int http_request(struct http_req **reqp, struct http_cli *cli, const char *met,
 			goto out;
 	}
 	else {
+		#ifdef HAVE_INET6
+		req->ipv6fb = true;
+		#endif
 		err = dnsc_query(&req->dq, cli->dnsc, req->host,
 				 DNS_TYPE_A, DNS_CLASS_IN, true,
 				 query_handler, req);
-		if (err)
-			goto out;
 	}
 
  out: