emu: Send a static GPRS ATTACH request and wait for the reply.

This will send a static message. It will trigger the GMM code
on the SGSN and might ask us for the IMEI/IMSI or send us an
accept. As we are not replying at all the SGSN needs to send new
requests and we can observe if the sequence number is increasing
like it should.

3 files changed, 61 insertions, 2 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index a037618f..7216d3b5 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -9,7 +9,7 @@ rlcmac_RLCMACTest_LDADD = \
 	$(LIBOSMOCORE_LIBS) \
 	$(COMMON_LA)
 
-emu_pcu_emu_SOURCES = emu/pcu_emu.cpp
+emu_pcu_emu_SOURCES = emu/pcu_emu.cpp emu/test_replay_gprs_attach.cpp
 emu_pcu_emu_LDADD = \
 	$(top_builddir)/src/libgprs.la \
 	$(LIBOSMOGB_LIBS) \
diff --git a/tests/emu/pcu_emu.cpp b/tests/emu/pcu_emu.cpp
index f78285d5..337c0c8f 100644
--- a/tests/emu/pcu_emu.cpp
+++ b/tests/emu/pcu_emu.cpp
@@ -36,6 +36,8 @@ void *tall_pcu_ctx;
 struct gprs_rlcmac_bts *gprs_rlcmac_bts;
 int16_t spoof_mnc = 0, spoof_mcc = 0;
 
+extern void test_replay_gprs_attach(struct gprs_bssgp_pcu *pcu);
+
 struct gprs_rlcmac_bts *create_bts()
 {
 	struct gprs_rlcmac_bts *bts;
@@ -62,9 +64,10 @@ struct gprs_rlcmac_bts *create_bts()
 	return bts;
 }
 
-static void bvci_unblocked(struct gprs_bssgp_pcu *pci)
+static void bvci_unblocked(struct gprs_bssgp_pcu *pcu)
 {
 	printf("BVCI unblocked. We can begin with test cases.\n");
+	test_replay_gprs_attach(pcu);
 }
 
 void create_and_connect_bssgp(struct gprs_rlcmac_bts *bts,
diff --git a/tests/emu/test_replay_gprs_attach.cpp b/tests/emu/test_replay_gprs_attach.cpp
new file mode 100644
index 00000000..500b16e1
--- /dev/null
+++ b/tests/emu/test_replay_gprs_attach.cpp
@@ -0,0 +1,56 @@
+/* (C) 2013 by Holger Hans Peter Freyther
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+extern "C" {
+#include <osmocom/core/msgb.h>
+}
+
+#include <gprs_bssgp_pcu.h>
+
+#include <stdint.h>
+#include <string.h>
+
+static const uint8_t gprs_attach_llc[] = {
+	/* LLC-PDU IE */
+	0x0e, 0x00, 0x2e,
+
+	0x01, 0xc0, 0x01, 0x08, 0x01, 0x02, 0xf5, 0x40,
+	0x71, 0x08, 0x00, 0x05, 0xf4, 0x2d, 0xf1, 0x18,
+	0x20, 0x62, 0xf2, 0x10, 0x09, 0x67, 0x00, 0x13,
+	0x16, 0x73, 0x43, 0x2a, 0x80, 0x42, 0x00, 0x42,
+	0x88, 0x0b, 0x04, 0x20, 0x04, 0x2e, 0x82, 0x30,
+	0x42, 0x00, 0x40, 0xaa, 0xf3, 0x18
+};
+
+struct msgb *create_msg(const uint8_t *data, size_t len)
+{
+	struct msgb *msg = msgb_alloc_headroom(4096, 128, "create msg");
+	msg->l3h = msgb_put(msg, len);
+	memcpy(msg->l3h, data, len);
+	return msg;
+}
+
+void test_replay_gprs_attach(struct gprs_bssgp_pcu *pcu)
+{
+	uint32_t tlli = 0xadf11820;
+	const uint8_t qos_profile[] = { 0x0, 0x0, 0x04 };
+
+	struct msgb *msg = create_msg(gprs_attach_llc, ARRAY_SIZE(gprs_attach_llc));
+	bssgp_tx_ul_ud(pcu->bctx, tlli, qos_profile, msg);
+}