lib-http: server: Properly handle empty Host header by providing a de…

…fault authority.

This behavior is required by the RFC.

src/lib-http/http-server-connection.c

@@ -4,6 +4,7 @@
 #include "llist.h"
 #include "array.h"
 #include "str.h"
+#include "hostpid.h"
 #include "ioloop.h"
 #include "istream.h"
 #include "istream-timeout.h"
@@ -14,6 +15,7 @@
 #include "master-service.h"
 #include "master-service-ssl.h"
 #include "http-date.h"
+#include "http-url.h"
 #include "http-request-parser.h"
 
 #include "http-server-private.h"
@@ -160,6 +162,8 @@ bool http_server_connection_shut_down(struct http_server_connection *conn)
 
 static void http_server_connection_ready(struct http_server_connection *conn)
 {
+	const struct http_server_settings *set = &conn->server->set;
+	struct http_url base_url;
 	struct stat st;
 
 	if (conn->server->set.rawlog_dir != NULL &&
@@ -168,8 +172,18 @@ static void http_server_connection_ready(struct http_server_connection *conn)
 				       &conn->conn.input, &conn->conn.output);
 	}
 
+	i_zero(&base_url);
+	if (set->default_host != NULL)
+		base_url.host.name = set->default_host;
+	else if (conn->ip.family != 0)
+		base_url.host.ip = conn->ip;
+	else
+		base_url.host.name = my_hostname;
+	base_url.port = conn->port;
+	base_url.have_ssl = conn->ssl;
+
 	conn->http_parser = http_request_parser_init(
-		conn->conn.input, NULL, &conn->server->set.request_limits,
+		conn->conn.input, &base_url, &conn->server->set.request_limits,
 		HTTP_REQUEST_PARSE_FLAG_STRICT);
 	o_stream_set_flush_callback(conn->conn.output,
     http_server_connection_output, conn);

src/lib-http/http-server.c

@@ -28,6 +28,9 @@ struct http_server *http_server_init(const struct http_server_settings *set)
 	pool = pool_alloconly_create("http server", 1024);
 	server = p_new(pool, struct http_server, 1);
 	server->pool = pool;
+
+	if (set->default_host != NULL && *set->default_host != '\0')
+		server->set.default_host = p_strdup(pool, set->default_host);
 	if (set->rawlog_dir != NULL && *set->rawlog_dir != '\0')
 		server->set.rawlog_dir = p_strdup(pool, set->rawlog_dir);
 	if (set->ssl != NULL) {

src/lib-http/http-server.h

@@ -19,6 +19,8 @@ struct http_server_response;
  */
 
 struct http_server_settings {
+	const char *default_host;
+
 	const char *rawlog_dir;
 
 	/* SSL settings; if NULL, master_service_ssl_init() is used instead */