initial working osmo-smlc implementation

The lower level Lb/SCCP interface conn handling is essentially a copy of
OsmoMSC's A/SCCP infrastructure (OsmoMSC also connects to multiple BSCs).

The smlc_subscr is mostly a copy of OsmoBSC's bsc_subscr.

smlc_loc_req FSM is the SMLC side of OsmoBSC's new lcs_loc_req FSM.

cell_locations configures geographic coordinates of individual cells.

Change-Id: I917ba8fc51a1f1150be77ae01e12a7b16a853052
diff --git a/tests/smlc_subscr/smlc_subscr_test.c b/tests/smlc_subscr/smlc_subscr_test.c
new file mode 100644
index 0000000..92b7293
--- /dev/null
+++ b/tests/smlc_subscr/smlc_subscr_test.c
@@ -0,0 +1,157 @@
+/*
+ * (C) 2020 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ *
+ * Author: Neels Hofmeyr <neels@hofmeyr.de>
+ *
+ * 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 Affero 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/>.
+ *
+ */
+
+#include <osmocom/smlc/debug.h>
+#include <osmocom/smlc/smlc_data.h>
+#include <osmocom/smlc/smlc_subscr.h>
+
+#include <osmocom/core/application.h>
+#include <osmocom/core/utils.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+struct smlc_state *g_smlc;
+
+#define VERBOSE_ASSERT(val, expect_op, fmt) \
+	do { \
+		printf(#val " == " fmt "\n", (val)); \
+		OSMO_ASSERT((val) expect_op); \
+	} while (0);
+
+#define USE_FOO "foo"
+#define USE_BAR "bar"
+
+static void assert_smlc_subscr(const struct smlc_subscr *smlc_subscr, const struct osmo_mobile_identity *imsi)
+{
+	struct smlc_subscr *sfound;
+	OSMO_ASSERT(smlc_subscr);
+	OSMO_ASSERT(osmo_mobile_identity_cmp(&smlc_subscr->imsi, imsi) == 0);
+
+	sfound = smlc_subscr_find(imsi, __func__);
+	OSMO_ASSERT(sfound == smlc_subscr);
+
+	smlc_subscr_put(sfound, __func__);
+}
+
+static void test_smlc_subscr(void)
+{
+	struct smlc_subscr *s1, *s2, *s3;
+	const struct osmo_mobile_identity imsi1 = { .type = GSM_MI_TYPE_IMSI, .imsi = "1234567890", };
+	const struct osmo_mobile_identity imsi2 = { .type = GSM_MI_TYPE_IMSI, .imsi = "9876543210", };
+	const struct osmo_mobile_identity imsi3 = { .type = GSM_MI_TYPE_IMSI, .imsi = "423423", };
+
+	printf("Test SMLC subscriber allocation and deletion\n");
+
+	/* Check for emptiness */
+	VERBOSE_ASSERT(llist_count(&g_smlc->subscribers), == 0, "%d");
+	OSMO_ASSERT(smlc_subscr_find(&imsi1, "-") == NULL);
+	OSMO_ASSERT(smlc_subscr_find(&imsi2, "-") == NULL);
+	OSMO_ASSERT(smlc_subscr_find(&imsi3, "-") == NULL);
+
+	/* Allocate entry 1 */
+	s1 = smlc_subscr_find_or_create(&imsi1, USE_FOO);
+	VERBOSE_ASSERT(llist_count(&g_smlc->subscribers), == 1, "%d");
+	assert_smlc_subscr(s1, &imsi1);
+	VERBOSE_ASSERT(llist_count(&g_smlc->subscribers), == 1, "%d");
+	OSMO_ASSERT(smlc_subscr_find(&imsi2, "-") == NULL);
+
+	/* Allocate entry 2 */
+	s2 = smlc_subscr_find_or_create(&imsi2, USE_BAR);
+	VERBOSE_ASSERT(llist_count(&g_smlc->subscribers), == 2, "%d");
+
+	/* Allocate entry 3 */
+	s3 = smlc_subscr_find_or_create(&imsi3, USE_FOO);
+	smlc_subscr_get(s3, USE_BAR);
+	VERBOSE_ASSERT(llist_count(&g_smlc->subscribers), == 3, "%d");
+
+	/* Check entries */
+	assert_smlc_subscr(s1, &imsi1);
+	assert_smlc_subscr(s2, &imsi2);
+	assert_smlc_subscr(s3, &imsi3);
+
+	/* Free entry 1 */
+	smlc_subscr_put(s1, USE_FOO);
+	s1 = NULL;
+	VERBOSE_ASSERT(llist_count(&g_smlc->subscribers), == 2, "%d");
+	OSMO_ASSERT(smlc_subscr_find(&imsi1, "-") == NULL);
+
+	assert_smlc_subscr(s2, &imsi2);
+	assert_smlc_subscr(s3, &imsi3);
+
+	/* Free entry 2 */
+	smlc_subscr_put(s2, USE_BAR);
+	s2 = NULL;
+	VERBOSE_ASSERT(llist_count(&g_smlc->subscribers), == 1, "%d");
+	OSMO_ASSERT(smlc_subscr_find(&imsi1, "-") == NULL);
+	OSMO_ASSERT(smlc_subscr_find(&imsi2, "-") == NULL);
+	assert_smlc_subscr(s3, &imsi3);
+
+	/* Remove one use of entry 3 */
+	smlc_subscr_put(s3, USE_BAR);
+	assert_smlc_subscr(s3, &imsi3);
+	VERBOSE_ASSERT(llist_count(&g_smlc->subscribers), == 1, "%d");
+
+	/* Free entry 3 */
+	smlc_subscr_put(s3, USE_FOO);
+	s3 = NULL;
+	VERBOSE_ASSERT(llist_count(&g_smlc->subscribers), == 0, "%d");
+	OSMO_ASSERT(smlc_subscr_find(&imsi3, "-") == NULL);
+
+	OSMO_ASSERT(llist_empty(&g_smlc->subscribers));
+}
+
+static const struct log_info_cat log_categories[] = {
+	[DREF] = {
+		.name = "DREF",
+		.description = "Reference Counting",
+		.enabled = 1, .loglevel = LOGL_DEBUG,
+	},
+};
+
+static const struct log_info log_info = {
+	.cat = log_categories,
+	.num_cat = ARRAY_SIZE(log_categories),
+};
+
+int main()
+{
+	void *ctx = talloc_named_const(NULL, 0, "smlc_subscr_test");
+
+	osmo_init_logging2(ctx, &log_info);
+	log_set_print_filename(osmo_stderr_target, 0);
+	log_set_print_timestamp(osmo_stderr_target, 0);
+	log_set_use_color(osmo_stderr_target, 0);
+	log_set_print_category(osmo_stderr_target, 1);
+
+	g_smlc = smlc_state_alloc(ctx);
+
+	printf("Testing SMLC subscriber code.\n");
+
+	test_smlc_subscr();
+
+	printf("Done\n");
+	return 0;
+}
+