gsm/gsm0480.c: introduce gsm0480_extract_ie_by_tag()
In some cases, there is no need to parse the whole message,
e.g. during the conversion from DTAP to GSUP/MAP. This
function can be used to extract given IE from a message.
Change-Id: I3989d061903352473305f80712f1a1560d05df3d
diff --git a/tests/ussd/ussd_test.c b/tests/ussd/ussd_test.c
index 1f79063..23fd739 100644
--- a/tests/ussd/ussd_test.c
+++ b/tests/ussd/ussd_test.c
@@ -34,6 +34,17 @@
0x01, 0x7f, 0x01, 0x00
};
+static const uint8_t ussd_facility[] = {
+ 0x1b, 0x3a, 0x12, 0xa2, 0x10, 0x02, 0x01, 0x01,
+ 0x30, 0x0b, 0x02, 0x01, 0x3c, 0x30, 0x06, 0x04,
+ 0x01, 0x0f, 0x04, 0x01, 0x32
+};
+
+static const uint8_t ussd_release[] = {
+ 0x8b, 0x2a, 0x1c, 0x08, 0xa3, 0x06, 0x02, 0x01,
+ 0x05, 0x02, 0x01, 0x24
+};
+
static const uint8_t interrogate_ss[] = {
0x0b, 0x7b, 0x1c, 0x0d, 0xa1, 0x0b, 0x02, 0x01,
0x03, 0x02, 0x01, 0x0e, 0x30, 0x03, 0x04, 0x01,
@@ -116,6 +127,67 @@
}
}
+static void test_extract_ie_by_tag(void)
+{
+ uint16_t ie_len;
+ uint8_t *ie;
+ int rc;
+
+ printf("[i] Testing gsm0480_extract_ie_by_tag()\n");
+
+ /* REGISTER message with Facility IE */
+ rc = gsm0480_extract_ie_by_tag((struct gsm48_hdr *) ussd_request,
+ sizeof(ussd_request), &ie, &ie_len, GSM0480_IE_FACILITY);
+ OSMO_ASSERT(rc == 0);
+ OSMO_ASSERT(ie != NULL && ie_len > 0);
+ printf("[?] REGISTER message with Facility IE "
+ "(len=%u): %s\n", ie_len, osmo_hexdump(ie, ie_len));
+
+ /* REGISTER message with SS version IE */
+ rc = gsm0480_extract_ie_by_tag((struct gsm48_hdr *) ussd_request,
+ sizeof(ussd_request), &ie, &ie_len, GSM0480_IE_SS_VERSION);
+ OSMO_ASSERT(rc == 0);
+ OSMO_ASSERT(ie != NULL && ie_len > 0);
+ printf("[?] REGISTER message with SS version IE "
+ "(len=%u): %s\n", ie_len, osmo_hexdump(ie, ie_len));
+
+ /* REGISTER message with unknown IE */
+ rc = gsm0480_extract_ie_by_tag((struct gsm48_hdr *) ussd_request,
+ sizeof(ussd_request), &ie, &ie_len, 0xff);
+ OSMO_ASSERT(rc == 0);
+ OSMO_ASSERT(ie == NULL && ie_len == 0);
+
+ /* FACILITY message with Facility IE */
+ rc = gsm0480_extract_ie_by_tag((struct gsm48_hdr *) ussd_facility,
+ sizeof(ussd_facility), &ie, &ie_len, GSM0480_IE_FACILITY);
+ OSMO_ASSERT(rc == 0);
+ OSMO_ASSERT(ie != NULL && ie_len > 0);
+ printf("[?] FACILITY message with Facility IE "
+ "(len=%u): %s\n", ie_len, osmo_hexdump(ie, ie_len));
+
+ /* FACILITY message with unknown IE */
+ rc = gsm0480_extract_ie_by_tag((struct gsm48_hdr *) ussd_facility,
+ sizeof(ussd_facility), &ie, &ie_len, 0xff);
+ OSMO_ASSERT(rc == 0);
+ OSMO_ASSERT(ie == NULL && ie_len == 0);
+
+ /* RELEASE COMPLETE message with Facility IE */
+ rc = gsm0480_extract_ie_by_tag((struct gsm48_hdr *) ussd_release,
+ sizeof(ussd_release), &ie, &ie_len, GSM0480_IE_FACILITY);
+ OSMO_ASSERT(rc == 0);
+ OSMO_ASSERT(ie != NULL && ie_len > 0);
+ printf("[?] RELEASE COMPLETE message with Facility IE "
+ "(len=%u): %s\n", ie_len, osmo_hexdump(ie, ie_len));
+
+ /* RELEASE COMPLETE message without Facility IE */
+ rc = gsm0480_extract_ie_by_tag((struct gsm48_hdr *) ussd_release,
+ sizeof(struct gsm48_hdr), &ie, &ie_len, GSM0480_IE_FACILITY);
+ OSMO_ASSERT(rc == 0);
+ OSMO_ASSERT(ie == NULL && ie_len == 0);
+
+ printf("\n");
+}
+
int main(int argc, char **argv)
{
struct ss_request req;
@@ -126,6 +198,9 @@
osmo_init_logging2(ctx, &info);
+ /* Test gsm0480_extract_ie_by_tag() */
+ test_extract_ie_by_tag();
+
memset(&req, 0, sizeof(req));
gsm0480_decode_ss_request((struct gsm48_hdr *) ussd_request,
sizeof(ussd_request), &req);