diff options
Diffstat (limited to 'src/shared/libosmocore/src/gsm/gsm0480.c')
| -rw-r--r-- | src/shared/libosmocore/src/gsm/gsm0480.c | 461 |
1 files changed, 0 insertions, 461 deletions
diff --git a/src/shared/libosmocore/src/gsm/gsm0480.c b/src/shared/libosmocore/src/gsm/gsm0480.c deleted file mode 100644 index b9b3ed97..00000000 --- a/src/shared/libosmocore/src/gsm/gsm0480.c +++ /dev/null @@ -1,461 +0,0 @@ -/* Format functions for GSM 04.80 */ - -/* - * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> - * (C) 2009 by Mike Haben <michael.haben@btinternet.com> - * - * All Rights Reserved - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 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 General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - * - */ - -#include <osmocom/gsm/gsm0480.h> -#include <osmocom/gsm/gsm_utils.h> - -#include <osmocom/core/logging.h> - -#include <osmocom/gsm/protocol/gsm_04_08.h> -#include <osmocom/gsm/protocol/gsm_04_80.h> - -#include <string.h> - -static inline unsigned char *msgb_wrap_with_TL(struct msgb *msgb, uint8_t tag) -{ - uint8_t *data = msgb_push(msgb, 2); - - data[0] = tag; - data[1] = msgb->len - 2; - return data; -} - -static inline unsigned char *msgb_push_TLV1(struct msgb *msgb, uint8_t tag, - uint8_t value) -{ - uint8_t *data = msgb_push(msgb, 3); - - data[0] = tag; - data[1] = 1; - data[2] = value; - return data; -} - -/* wrap an invoke around it... the other way around - * - * 1.) Invoke Component tag - * 2.) Invoke ID Tag - * 3.) Operation - * 4.) Data - */ -int gsm0480_wrap_invoke(struct msgb *msg, int op, int link_id) -{ - /* 3. operation */ - msgb_push_TLV1(msg, GSM0480_OPERATION_CODE, op); - - /* 2. invoke id tag */ - msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, link_id); - - /* 1. component tag */ - msgb_wrap_with_TL(msg, GSM0480_CTYPE_INVOKE); - - return 0; -} - -/* wrap the GSM 04.08 Facility IE around it */ -int gsm0480_wrap_facility(struct msgb *msg) -{ - msgb_wrap_with_TL(msg, GSM0480_IE_FACILITY); - - return 0; -} - -struct msgb *gsm0480_create_unstructuredSS_Notify(int alertPattern, const char *text) -{ - struct msgb *msg; - uint8_t *seq_len_ptr, *ussd_len_ptr, *data; - int len; - - msg = msgb_alloc_headroom(1024, 128, "GSM 04.80"); - if (!msg) - return NULL; - - /* SEQUENCE { */ - msgb_put_u8(msg, GSM_0480_SEQUENCE_TAG); - seq_len_ptr = msgb_put(msg, 1); - - /* DCS { */ - msgb_put_u8(msg, ASN1_OCTET_STRING_TAG); - msgb_put_u8(msg, 1); - msgb_put_u8(msg, 0x0F); - /* } DCS */ - - /* USSD-String { */ - msgb_put_u8(msg, ASN1_OCTET_STRING_TAG); - ussd_len_ptr = msgb_put(msg, 1); - data = msgb_put(msg, 0); - len = gsm_7bit_encode(data, text); - msgb_put(msg, len); - ussd_len_ptr[0] = len; - /* USSD-String } */ - - /* alertingPattern { */ - msgb_put_u8(msg, ASN1_OCTET_STRING_TAG); - msgb_put_u8(msg, 1); - msgb_put_u8(msg, alertPattern); - /* } alertingPattern */ - - seq_len_ptr[0] = 3 + 2 + ussd_len_ptr[0] + 3; - /* } SEQUENCE */ - - return msg; -} - -struct msgb *gsm0480_create_notifySS(const char *text) -{ - struct msgb *msg; - uint8_t *data, *tmp_len; - uint8_t *seq_len_ptr, *cal_len_ptr, *opt_len_ptr, *nam_len_ptr; - int len; - - len = strlen(text); - if (len < 1 || len > 160) - return NULL; - - msg = msgb_alloc_headroom(1024, 128, "GSM 04.80"); - if (!msg) - return NULL; - - msgb_put_u8(msg, GSM_0480_SEQUENCE_TAG); - seq_len_ptr = msgb_put(msg, 1); - - /* ss_code for CNAP { */ - msgb_put_u8(msg, 0x81); - msgb_put_u8(msg, 1); - msgb_put_u8(msg, 0x19); - /* } ss_code */ - - - /* nameIndicator { */ - msgb_put_u8(msg, 0xB4); - nam_len_ptr = msgb_put(msg, 1); - - /* callingName { */ - msgb_put_u8(msg, 0xA0); - opt_len_ptr = msgb_put(msg, 1); - msgb_put_u8(msg, 0xA0); - cal_len_ptr = msgb_put(msg, 1); - - /* namePresentationAllowed { */ - /* add the DCS value */ - msgb_put_u8(msg, 0x80); - msgb_put_u8(msg, 1); - msgb_put_u8(msg, 0x0F); - - /* add the lengthInCharacters */ - msgb_put_u8(msg, 0x81); - msgb_put_u8(msg, 1); - msgb_put_u8(msg, strlen(text)); - - /* add the actual string */ - msgb_put_u8(msg, 0x82); - tmp_len = msgb_put(msg, 1); - data = msgb_put(msg, 0); - len = gsm_7bit_encode(data, text); - tmp_len[0] = len; - msgb_put(msg, len); - - /* }; namePresentationAllowed */ - - cal_len_ptr[0] = 3 + 3 + 2 + len; - opt_len_ptr[0] = cal_len_ptr[0] + 2; - /* }; callingName */ - - nam_len_ptr[0] = opt_len_ptr[0] + 2; - /* ); nameIndicator */ - - /* write the lengths... */ - seq_len_ptr[0] = 3 + nam_len_ptr[0] + 2; - - return msg; -} - -/* Forward declarations */ -static int parse_ussd(const struct gsm48_hdr *hdr, - uint16_t len, struct ussd_request *req); -static int parse_ussd_info_elements(const uint8_t *ussd_ie, uint16_t len, - struct ussd_request *req); -static int parse_facility_ie(const uint8_t *facility_ie, uint16_t length, - struct ussd_request *req); -static int parse_ss_invoke(const uint8_t *invoke_data, uint16_t length, - struct ussd_request *req); -static int parse_process_uss_req(const uint8_t *uss_req_data, uint16_t length, - struct ussd_request *req); - -/* Decode a mobile-originated USSD-request message */ -int gsm0480_decode_ussd_request(const struct gsm48_hdr *hdr, uint16_t len, - struct ussd_request *req) -{ - int rc = 0; - - if (len < sizeof(*hdr) + 2) { - LOGP(0, LOGL_DEBUG, "USSD Request is too short.\n"); - return 0; - } - - if ((hdr->proto_discr & 0x0f) == GSM48_PDISC_NC_SS) { - req->transaction_id = hdr->proto_discr & 0x70; - rc = parse_ussd(hdr, len, req); - } - - if (!rc) - LOGP(0, LOGL_DEBUG, "Error occurred while parsing received USSD!\n"); - - return rc; -} - -static int parse_ussd(const struct gsm48_hdr *hdr, uint16_t len, struct ussd_request *req) -{ - int rc = 1; - uint8_t msg_type = hdr->msg_type & 0xBF; /* message-type - section 3.4 */ - - switch (msg_type) { - case GSM0480_MTYPE_RELEASE_COMPLETE: - LOGP(0, LOGL_DEBUG, "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(&hdr->data[0], len - sizeof(*hdr), req); - break; - default: - LOGP(0, LOGL_DEBUG, "Unknown GSM 04.80 message-type field 0x%02x\n", - hdr->msg_type); - rc = 0; - break; - } - - return rc; -} - -static int parse_ussd_info_elements(const uint8_t *ussd_ie, uint16_t len, - struct ussd_request *req) -{ - int rc = -1; - /* Information Element Identifier - table 3.2 & GSM 04.08 section 10.5 */ - uint8_t iei; - uint8_t iei_length; - - iei = ussd_ie[0]; - iei_length = ussd_ie[1]; - - /* If the data does not fit, report an error */ - if (len - 2 < iei_length) - return 0; - - 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: - LOGP(0, LOGL_DEBUG, "Unhandled GSM 04.08 or 04.80 IEI 0x%02x\n", - iei); - rc = 0; - break; - } - - return rc; -} - -static int parse_facility_ie(const uint8_t *facility_ie, uint16_t length, - struct ussd_request *req) -{ - int rc = 1; - uint8_t offset = 0; - - while (offset + 2 <= length) { - /* Component Type tag - table 3.7 */ - uint8_t component_type = facility_ie[offset]; - uint8_t component_length = facility_ie[offset+1]; - - /* size check */ - if (offset + 2 + component_length > length) { - LOGP(0, LOGL_ERROR, "Component does not fit.\n"); - return 0; - } - - 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: - LOGP(0, LOGL_DEBUG, "Unknown GSM 04.80 Facility " - "Component Type 0x%02x\n", component_type); - rc = 0; - break; - } - offset += (component_length+2); - }; - - return rc; -} - -/* Parse an Invoke component - see table 3.3 */ -static int parse_ss_invoke(const uint8_t *invoke_data, uint16_t length, - struct ussd_request *req) -{ - int rc = 1; - uint8_t offset; - - if (length < 3) - return 0; - - /* mandatory part */ - if (invoke_data[0] != GSM0480_COMPIDTAG_INVOKE_ID) { - LOGP(0, LOGL_DEBUG, "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]; - - /* look ahead once */ - if (offset + 1 > length) - return 0; - - /* 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) { - if (offset + 2 > length) - return 0; - uint8_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: - LOGP(0, LOGL_DEBUG, "GSM 04.80 operation code 0x%02x " - "is not yet handled\n", operation_code); - rc = 0; - break; - } - } else { - LOGP(0, LOGL_DEBUG, "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(const uint8_t *uss_req_data, uint16_t length, - struct ussd_request *req) -{ - int rc = 0; - int num_chars; - uint8_t dcs; - - - /* we need at least that much */ - if (length < 8) - return 0; - - - 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); - rc = 1; - } - } - } - return rc; -} - -struct msgb *gsm0480_create_ussd_resp(uint8_t invoke_id, uint8_t trans_id, const char *text) -{ - struct msgb *msg; - struct gsm48_hdr *gh; - uint8_t *ptr8; - int response_len; - - msg = msgb_alloc_headroom(1024, 128, "GSM 04.80"); - if (!msg) - return NULL; - - /* First put the payload text into the message */ - ptr8 = msgb_put(msg, 0); - response_len = gsm_7bit_encode(ptr8, text); - msgb_put(msg, response_len); - - /* Then wrap it as an Octet String */ - msgb_wrap_with_TL(msg, ASN1_OCTET_STRING_TAG); - - /* Pre-pend the DCS octet string */ - msgb_push_TLV1(msg, ASN1_OCTET_STRING_TAG, 0x0F); - - /* Then wrap these as a Sequence */ - msgb_wrap_with_TL(msg, GSM_0480_SEQUENCE_TAG); - - /* Pre-pend the operation code */ - msgb_push_TLV1(msg, GSM0480_OPERATION_CODE, - GSM0480_OP_CODE_PROCESS_USS_REQ); - - /* Wrap the operation code and IA5 string as a sequence */ - msgb_wrap_with_TL(msg, GSM_0480_SEQUENCE_TAG); - - /* Pre-pend the invoke ID */ - msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, invoke_id); - - /* Wrap this up as a Return Result component */ - msgb_wrap_with_TL(msg, GSM0480_CTYPE_RETURN_RESULT); - - /* Wrap the component in a Facility message */ - msgb_wrap_with_TL(msg, GSM0480_IE_FACILITY); - - /* And finally pre-pend the L3 header */ - gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh)); - gh->proto_discr = GSM48_PDISC_NC_SS | trans_id - | (1<<7); /* TI direction = 1 */ - gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE; - - return msg; -} |