[Asterisk-code-review] res pjsip empty info: Respond to empty SIP INFO packets (asterisk[13])

[snuffy]

snuffy has uploaded a new change for review.

  https://gerrit.asterisk.org/2796

Change subject: res_pjsip_empty_info: Respond to empty SIP INFO packets
......................................................................

res_pjsip_empty_info: Respond to empty SIP INFO packets

Some SBCs require responses to empty SIP INFO packets
after establishing call via INVITE, if not responded to
they may drop your call after unspecified timeout of X minutes.

They are identified by having no Content-Type, check for this
and respond with 200 - OK message.

ASTERISK-24986 #close
Reported-by: Ilya Trikoz, Federico Santulli

Change-Id: Ib27e4f07151e5aef28fa587e4ead36c5b87c43e0
---
M CHANGES
A res/res_pjsip_empty_info.c
2 files changed, 92 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/96/2796/1

diff --git a/CHANGES b/CHANGES
index 965b1b4..d98392d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -26,6 +26,12 @@
    into the "reg_server" field in the ps_contacts table to facilitate
    multi-server setups.
 
+res_pjsip_info_empty
+--------------------
+ * A new module that can respond to empty Content-Type INFO packets during call.
+   Some SBCs will terminate a call if their empty INFO packets are not responded
+   to within a predefined time.
+
 app_confbridge
 ------------------
  * Added a bridge profile option called regcontext that allows you to
diff --git a/res/res_pjsip_empty_info.c b/res/res_pjsip_empty_info.c
new file mode 100644
index 0000000..62ee7b1
--- /dev/null
+++ b/res/res_pjsip_empty_info.c
@@ -0,0 +1,86 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2016, Digium, Inc.
+ *
+ * Bradley Latus <brad.latus at gmail.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*** MODULEINFO
+	<depend>pjproject</depend>
+	<depend>res_pjsip</depend>
+	<depend>res_pjsip_session</depend>
+	<support_level>core</support_level>
+ ***/
+
+#include "asterisk.h"
+
+#include <pjsip.h>
+#include <pjsip_ua.h>
+
+#include "asterisk/res_pjsip.h"
+#include "asterisk/res_pjsip_session.h"
+#include "asterisk/module.h"
+
+static void send_response(struct ast_sip_session *session,
+		struct pjsip_rx_data *rdata, int code)
+{
+	pjsip_tx_data *tdata;
+	pjsip_dialog *dlg = session->inv_session->dlg;
+
+	if (pjsip_dlg_create_response(dlg, rdata, code, NULL, &tdata) == PJ_SUCCESS) {
+		struct pjsip_transaction *tsx = pjsip_rdata_get_tsx(rdata);
+		pjsip_dlg_send_response(dlg, tsx, tdata);
+	}
+}
+
+static int empty_info_incoming_request(struct ast_sip_session *session,
+		struct pjsip_rx_data *rdata)
+{
+	if (!rdata->msg_info.ctype) {
+		/* Need to return 200 OK on empty body */
+		/* Some SBCs use empty INFO as a KEEPALIVE */
+		send_response(session, rdata, 200);
+		return 0;
+	}
+
+	/* Let another module respond */
+	return 0;
+
+}
+
+static struct ast_sip_session_supplement empty_info_supplement = {
+	.method = "INFO",
+	.incoming_request = empty_info_incoming_request,
+};
+
+static int load_module(void)
+{
+	CHECK_PJSIP_SESSION_MODULE_LOADED();
+
+	ast_sip_session_register_supplement(&empty_info_supplement);
+	return AST_MODULE_LOAD_SUCCESS;
+}
+
+static int unload_module(void)
+{
+	ast_sip_session_unregister_supplement(&empty_info_supplement);
+	return 0;
+}
+
+AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Empty INFO Support",
+	.support_level = AST_MODULE_SUPPORT_CORE,
+	.load = load_module,
+	.unload = unload_module,
+	.load_pri = AST_MODPRI_APP_DEPEND,
+);

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Gerrit-MessageType: newchange
Gerrit-Change-Id: Ib27e4f07151e5aef28fa587e4ead36c5b87c43e0
Gerrit-PatchSet: 1
Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-Owner: snuffy <snuffy22 at gmail.com>