diff options
| -rw-r--r-- | include/osmocore/gsm0480.h | 1 | ||||
| -rw-r--r-- | src/gsm0480.c | 50 |
2 files changed, 51 insertions, 0 deletions
diff --git a/include/osmocore/gsm0480.h b/include/osmocore/gsm0480.h index 94ac7174..b504332e 100644 --- a/include/osmocore/gsm0480.h +++ b/include/osmocore/gsm0480.h @@ -16,6 +16,7 @@ struct ussd_request { int gsm0480_decode_ussd_request(const struct gsm48_hdr *hdr, uint16_t len, struct ussd_request *request); +struct msgb *gsm0480_create_ussd_resp(uint8_t invoke_id, uint8_t trans_id, const char *text); struct msgb *gsm0480_create_unstructuredSS_Notify(int alertPattern, const char *text); struct msgb *gsm0480_create_notifySS(const char *text); diff --git a/src/gsm0480.c b/src/gsm0480.c index b4ba8305..b6b345cb 100644 --- a/src/gsm0480.c +++ b/src/gsm0480.c @@ -409,3 +409,53 @@ static int parse_process_uss_req(const uint8_t *uss_req_data, uint16_t length, } 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; +} |