From daa0fe76377a67ce4131e94ab405775e8edb9a79 Mon Sep 17 00:00:00 2001 From: Holger Hans Peter Freyther Date: Sun, 10 Oct 2010 17:12:05 +0200 Subject: ussd: Move the code libosmocore, increase the version number. Move the code to libosmocore, update the header file and the version required in the configure.in. --- openbsc/src/gsm_04_80.c | 186 ------------------------------------------------ 1 file changed, 186 deletions(-) (limited to 'openbsc/src') diff --git a/openbsc/src/gsm_04_80.c b/openbsc/src/gsm_04_80.c index 42f81ba73..e0f47ff01 100644 --- a/openbsc/src/gsm_04_80.c +++ b/openbsc/src/gsm_04_80.c @@ -40,17 +40,6 @@ #include #include -/* Forward declarations */ -static int parse_ussd(u_int8_t *ussd, struct ussd_request *req); -static int parse_ussd_info_elements(u_int8_t *ussd_ie, - struct ussd_request *req); -static int parse_facility_ie(u_int8_t *facility_ie, u_int8_t length, - struct ussd_request *req); -static int parse_ss_invoke(u_int8_t *invoke_data, u_int8_t length, - struct ussd_request *req); -static int parse_process_uss_req(u_int8_t *uss_req_data, u_int8_t length, - struct ussd_request *req); - static inline unsigned char *msgb_wrap_with_TL(struct msgb *msgb, u_int8_t tag) { uint8_t *data = msgb_push(msgb, 2); @@ -72,181 +61,6 @@ static inline unsigned char *msgb_push_TLV1(struct msgb *msgb, u_int8_t tag, } -/* Decode a mobile-originated USSD-request message */ -int gsm0480_decode_ussd_request(const struct msgb *msg, struct ussd_request *req) -{ - int rc = 0; - u_int8_t *parse_ptr = msgb_l3(msg); - - if ((*parse_ptr & 0x0F) == GSM48_PDISC_NC_SS) { - req->transaction_id = *parse_ptr & 0x70; - rc = parse_ussd(parse_ptr+1, req); - } - - if (!rc) - DEBUGP(DMM, "Error occurred while parsing received USSD!\n"); - - return rc; -} - -static int parse_ussd(u_int8_t *ussd, struct ussd_request *req) -{ - int rc = 1; - u_int8_t msg_type = ussd[0] & 0xBF; /* message-type - section 3.4 */ - - switch (msg_type) { - case GSM0480_MTYPE_RELEASE_COMPLETE: - DEBUGP(DMM, "USS Release Complete\n"); - /* could also parse out the optional Cause/Facility data */ - req->text[0] = 0xFF; - break; - case GSM0480_MTYPE_REGISTER: - case GSM0480_MTYPE_FACILITY: - rc &= parse_ussd_info_elements(ussd+1, req); - break; - default: - fprintf(stderr, "Unknown GSM 04.80 message-type field 0x%02x\n", - ussd[0]); - rc = 0; - break; - } - - return rc; -} - -static int parse_ussd_info_elements(u_int8_t *ussd_ie, struct ussd_request *req) -{ - int rc = -1; - /* Information Element Identifier - table 3.2 & GSM 04.08 section 10.5 */ - u_int8_t iei = ussd_ie[0]; - u_int8_t iei_length = ussd_ie[1]; - - switch (iei) { - case GSM48_IE_CAUSE: - break; - case GSM0480_IE_FACILITY: - rc = parse_facility_ie(ussd_ie+2, iei_length, req); - break; - case GSM0480_IE_SS_VERSION: - break; - default: - fprintf(stderr, "Unhandled GSM 04.08 or 04.80 IEI 0x%02x\n", - iei); - rc = 0; - break; - } - - return rc; -} - -static int parse_facility_ie(u_int8_t *facility_ie, u_int8_t length, - struct ussd_request *req) -{ - int rc = 1; - u_int8_t offset = 0; - - do { - /* Component Type tag - table 3.7 */ - u_int8_t component_type = facility_ie[offset]; - u_int8_t component_length = facility_ie[offset+1]; - - switch (component_type) { - case GSM0480_CTYPE_INVOKE: - rc &= parse_ss_invoke(facility_ie+2, - component_length, - req); - break; - case GSM0480_CTYPE_RETURN_RESULT: - break; - case GSM0480_CTYPE_RETURN_ERROR: - break; - case GSM0480_CTYPE_REJECT: - break; - default: - fprintf(stderr, "Unknown GSM 04.80 Facility " - "Component Type 0x%02x\n", component_type); - rc = 0; - break; - } - offset += (component_length+2); - } while (offset < length); - - return rc; -} - -/* Parse an Invoke component - see table 3.3 */ -static int parse_ss_invoke(u_int8_t *invoke_data, u_int8_t length, - struct ussd_request *req) -{ - int rc = 1; - u_int8_t offset; - - /* mandatory part */ - if (invoke_data[0] != GSM0480_COMPIDTAG_INVOKE_ID) { - fprintf(stderr, "Unexpected GSM 04.80 Component-ID tag " - "0x%02x (expecting Invoke ID tag)\n", invoke_data[0]); - } - - offset = invoke_data[1] + 2; - req->invoke_id = invoke_data[2]; - - /* optional part */ - if (invoke_data[offset] == GSM0480_COMPIDTAG_LINKED_ID) - offset += invoke_data[offset+1] + 2; /* skip over it */ - - /* mandatory part */ - if (invoke_data[offset] == GSM0480_OPERATION_CODE) { - u_int8_t operation_code = invoke_data[offset+2]; - switch (operation_code) { - case GSM0480_OP_CODE_PROCESS_USS_REQ: - rc = parse_process_uss_req(invoke_data + offset + 3, - length - offset - 3, - req); - break; - default: - fprintf(stderr, "GSM 04.80 operation code 0x%02x " - "is not yet handled\n", operation_code); - rc = 0; - break; - } - } else { - fprintf(stderr, "Unexpected GSM 04.80 Component-ID tag 0x%02x " - "(expecting Operation Code tag)\n", - invoke_data[0]); - rc = 0; - } - - return rc; -} - -/* Parse the parameters of a Process UnstructuredSS Request */ -static int parse_process_uss_req(u_int8_t *uss_req_data, u_int8_t length, - struct ussd_request *req) -{ - int rc = 0; - int num_chars; - u_int8_t dcs; - - if (uss_req_data[0] == GSM_0480_SEQUENCE_TAG) { - if (uss_req_data[2] == ASN1_OCTET_STRING_TAG) { - dcs = uss_req_data[4]; - if ((dcs == 0x0F) && - (uss_req_data[5] == ASN1_OCTET_STRING_TAG)) { - num_chars = (uss_req_data[6] * 8) / 7; - /* Prevent a mobile-originated buffer-overrun! */ - if (num_chars > MAX_LEN_USSD_STRING) - num_chars = MAX_LEN_USSD_STRING; - gsm_7bit_decode(req->text, - &(uss_req_data[7]), num_chars); - /* append null-terminator */ - req->text[num_chars+1] = 0; - rc = 1; - } - } - } - return rc; -} - /* Send response to a mobile-originated ProcessUnstructuredSS-Request */ int gsm0480_send_ussd_response(struct gsm_subscriber_connection *conn, const struct msgb *in_msg, const char *response_text, -- cgit v1.2.3