This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/OpenBSC@lists.osmocom.org/.
Mike Haben michael.haben at btinternet.com---
openbsc/include/openbsc/gsm_04_80.h | 10 +
openbsc/include/openbsc/ussd.h | 8 +
openbsc/src/Makefile.am | 2 +-
openbsc/src/gsm_04_08.c | 6 +-
openbsc/src/gsm_04_80.c | 349 +++++++++++++++++++++++++++++++++++
openbsc/src/ussd.c | 59 ++++++
6 files changed, 431 insertions(+), 3 deletions(-)
create mode 100755 openbsc/include/openbsc/gsm_04_80.h
create mode 100644 openbsc/include/openbsc/ussd.h
create mode 100755 openbsc/src/gsm_04_80.c
create mode 100644 openbsc/src/ussd.c
diff --git a/openbsc/include/openbsc/gsm_04_80.h b/openbsc/include/openbsc/gsm_04_80.h
new file mode 100755
index 0000000..d16a876
--- /dev/null
+++ b/openbsc/include/openbsc/gsm_04_80.h
@@ -0,0 +1,10 @@
+#ifndef _GSM_04_80_H
+#define _GSM_04_80_H
+
+#include <openbsc/msgb.h>
+
+char* gsm0480_rcv_ussd(struct msgb *msg);
+int gsm0480_send_ussd_response(struct msgb *msg, const char* response_text);
+int gsm0480_send_ussd_error(struct msgb *msg);
+
+#endif
diff --git a/openbsc/include/openbsc/ussd.h b/openbsc/include/openbsc/ussd.h
new file mode 100644
index 0000000..dfd34f3
--- /dev/null
+++ b/openbsc/include/openbsc/ussd.h
@@ -0,0 +1,8 @@
+#ifndef _USSD_H
+#define _USSD_H
+
+#include <openbsc/msgb.h>
+
+int handle_rcv_ussd(struct msgb *msg);
+
+#endif
diff --git a/openbsc/src/Makefile.am b/openbsc/src/Makefile.am
index 919e075..2f715bb 100644
--- a/openbsc/src/Makefile.am
+++ b/openbsc/src/Makefile.am
@@ -14,7 +14,7 @@ libbsc_a_SOURCES = abis_rsl.c abis_nm.c gsm_data.c gsm_04_08_utils.c \
libmsc_a_SOURCES = gsm_subscriber.c db.c telnet_interface.c \
mncc.c rtp_proxy.c gsm_04_08.c gsm_04_11.c transaction.c \
- token_auth.c rrlp.c
+ token_auth.c rrlp.c gsm_04_80.c ussd.c
libvty_a_SOURCES = vty/buffer.c vty/command.c vty/vector.c vty/vty.c
diff --git a/openbsc/src/gsm_04_08.c b/openbsc/src/gsm_04_08.c
index 9ad9e15..62f2c18 100644
--- a/openbsc/src/gsm_04_08.c
+++ b/openbsc/src/gsm_04_08.c
@@ -48,6 +48,7 @@
#include <openbsc/rtp_proxy.h>
#include <openbsc/talloc.h>
#include <openbsc/transaction.h>
+#include <openbsc/ussd.h>
#define GSM_MAX_FACILITY 128
#define GSM_MAX_SSVERSION 128
@@ -3544,7 +3545,6 @@ static int gsm0408_rcv_cc(struct msgb *msg)
return rc;
}
-/* here we pass in a msgb from the RSL->RLL. We expect the l3 pointer to be set */
int gsm0408_rcvmsg(struct msgb *msg, u_int8_t link_id)
{
struct gsm48_hdr *gh = msgb_l3(msg);
@@ -3566,10 +3566,12 @@ int gsm0408_rcvmsg(struct msgb *msg, u_int8_t link_id)
break;
case GSM48_PDISC_MM_GPRS:
case GSM48_PDISC_SM_GPRS:
- case GSM48_PDISC_NC_SS: /* mobile-originated USSD */
fprintf(stderr, "Unimplemented GSM 04.08 discriminator 0x%02x\n",
pdisc);
break;
+ case GSM48_PDISC_NC_SS:
+ rc = handle_rcv_ussd(msg);
+ break;
default:
fprintf(stderr, "Unknown GSM 04.08 discriminator 0x%02x\n",
pdisc);
diff --git a/openbsc/src/gsm_04_80.c b/openbsc/src/gsm_04_80.c
new file mode 100755
index 0000000..c2c2a86
--- /dev/null
+++ b/openbsc/src/gsm_04_80.c
@@ -0,0 +1,349 @@
+/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface
+ * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
+
+/* (C) 2008-2009 by Harald Welte <laforge at gnumonks.org>
+ * (C) 2008, 2009 by Holger Hans Peter Freyther <zecke at selfish.org>
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <openbsc/msgb.h>
+#include <openbsc/tlv.h>
+#include <openbsc/debug.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/gsm_utils.h>
+#include <openbsc/gsm_04_08.h>
+#include <openbsc/gsm_04_80.h>
+
+/* GSM TS 04.80 definitions (Supplementary Services specification, Formats and coding */
+
+/* Section 3.4 */
+#define GSM0480_MTYPE_RELEASE_COMPLETE 0x2A
+#define GSM0480_MTYPE_FACILITY 0x3A
+#define GSM0480_MTYPE_REGISTER 0x3B
+
+/* Section 3.5 */
+#define GSM0480_IE_FACILITY 0x1C
+#define GSM0480_IE_SS_VERSION 0x7F
+
+/* Section 3.6.2 */
+#define GSM0480_CTYPE_INVOKE 0xA1
+#define GSM0480_CTYPE_RETURN_RESULT 0xA2
+#define GSM0480_CTYPE_RETURN_ERROR 0xA3
+#define GSM0480_CTYPE_REJECT 0xA4
+
+/* Section 3.6.3 */
+#define GSM0480_COMPIDTAG_INVOKE_ID 0x02
+#define GSM0480_COMPIDTAG_LINKED_ID 0x80
+
+/* Section 3.6.4 */
+#define GSM0480_OPERATION_CODE 0x02
+
+/* Section 4.5 */
+#define GSM0480_OP_CODE_REGISTER_SS 0x0A
+#define GSM0480_OP_CODE_ERASE_SS 0x0B
+#define GSM0480_OP_CODE_ACTIVATE_SS 0x0C
+#define GSM0480_OP_CODE_DEACTIVATE_SS 0x0D
+#define GSM0480_OP_CODE_INTERROGATE_SS 0x0E
+#define GSM0480_OP_CODE_NOTIFY_SS 0x10
+#define GSM0480_OP_CODE_REGISTER_PASSWORD 0x11
+#define GSM0480_OP_CODE_GET_PASSWORD 0x12
+#define GSM0480_OP_CODE_PROCESS_USS_DATA 0x13
+#define GSM0480_OP_CODE_FORWARD_CHECK_SS_IND 0x26
+#define GSM0480_OP_CODE_PROCESS_USS_REQ 0x3B
+#define GSM0480_OP_CODE_USS_REQUEST 0x3C
+#define GSM0480_OP_CODE_USS_NOTIFY 0x3D
+#define GSM0480_OP_CODE_FORWARD_CUG_INFO 0x78
+#define GSM0480_OP_CODE_SPLIT_MPTY 0x79
+#define GSM0480_OP_CODE_RETRIEVE_MPTY 0x7A
+#define GSM0480_OP_CODE_HOLD_MPTY 0x7B
+#define GSM0480_OP_CODE_BUILD_MPTY 0x7C
+#define GSM0480_OP_CODE_FORWARD_CHARGE_ADVICE 0x7D
+
+#define GSM0480_ERR_CODE_UNKNOWN_SUBSCRIBER 0x01
+#define GSM0480_ERR_CODE_ILLEGAL_SUBSCRIBER 0x09
+#define GSM0480_ERR_CODE_BEARER_SERVICE_NOT_PROVISIONED 0x0A
+#define GSM0480_ERR_CODE_TELESERVICE_NOT_PROVISIONED 0x0B
+#define GSM0480_ERR_CODE_ILLEGAL_EQUIPMENT 0x0C
+#define GSM0480_ERR_CODE_CALL_BARRED 0x0D
+#define GSM0480_ERR_CODE_ILLEGAL_SS_OPERATION 0x10
+#define GSM0480_ERR_CODE_SS_ERROR_STATUS 0x11
+#define GSM0480_ERR_CODE_SS_NOT_AVAILABLE 0x12
+#define GSM0480_ERR_CODE_SS_SUBSCRIPTION_VIOLATION 0x13
+#define GSM0480_ERR_CODE_SS_INCOMPATIBILITY 0x14
+#define GSM0480_ERR_CODE_FACILITY_NOT_SUPPORTED 0x15
+#define GSM0480_ERR_CODE_ABSENT_SUBSCRIBER 0x1B
+#define GSM0480_ERR_CODE_SYSTEM_FAILURE 0x22
+#define GSM0480_ERR_CODE_DATA_MISSING 0x23
+#define GSM0480_ERR_CODE_UNEXPECTED_DATA_VALUE 0x24
+#define GSM0480_ERR_CODE_PW_REGISTRATION_FAILURE 0x25
+#define GSM0480_ERR_CODE_NEGATIVE_PW_CHECK 0x26
+#define GSM0480_ERR_CODE_NUM_PW_ATTEMPTS_VIOLATION 0x2B
+#define GSM0480_ERR_CODE_UNKNOWN_ALPHABET 0x47
+#define GSM0480_ERR_CODE_USSD_BUSY 0x48
+#define GSM0480_ERR_CODE_MAX_MPTY_PARTICIPANTS 0x7E
+#define GSM0480_ERR_CODE_RESOURCES_NOT_AVAILABLE 0x7F
+
+static char ussd_string_buff[256];
+
+/* Forward declarations */
+static int parse_ussd(u_int8_t *ussd, u_int8_t length);
+static int parse_ussd_information_elements(u_int8_t *ussd_ie, u_int8_t length);
+static int parse_facility_ie(u_int8_t *facility_ie, u_int8_t length);
+static int parse_ss_invoke(u_int8_t *invoke_data, u_int8_t length);
+static int parse_process_uss_req(u_int8_t *uss_req_data, u_int8_t length);
+
+/* Receive a mobile-originated USSD message and return the decoded text */
+char* gsm0480_rcv_ussd(struct msgb *msg)
+{
+ int rc = 1;
+ u_int8_t tag;
+ u_int8_t length;
+ u_int8_t offset = 2; // don't yet understand the first 2 bytes, so ignore them for now
+
+ DEBUGP(DMM, "USSD %s\n", hexdump(msg->data, msg->len)); // preliminary! Just see what we're receiving...
+
+ memset(ussd_string_buff, 0, sizeof(ussd_string_buff));
+
+ do
+ {
+ tag = msg->data[offset];
+ length = msg->data[offset+1];
+ if((msg->data[offset+2] & 0x0f) == GSM48_PDISC_NC_SS) // not sure if this is correct???
+ rc &= parse_ussd(&(msg->data[offset+3]), length-3);
+ offset += (length+2);
+ }
+ while(offset < msg->len);
+
+ if(rc)
+ DEBUGP(DMM, "USSD received OK, response not yet implemented\n");
+ else
+ DEBUGP(DMM, "Error occurred while parsing received USSD!\n");
+
+ return ussd_string_buff;
+}
+
+static int parse_ussd(u_int8_t *ussd, u_int8_t length)
+{
+ 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
+ break;
+ case GSM0480_MTYPE_REGISTER:
+ case GSM0480_MTYPE_FACILITY:
+ rc &= parse_ussd_information_elements(ussd+1, length-1);
+ 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_information_elements(u_int8_t *ussd_ie, u_int8_t length)
+{
+ int rc = 1;
+ u_int8_t offset = 0;
+
+ do
+ {
+ u_int8_t iei = ussd_ie[offset]; // Information Element Identifier - table 3.2 & GSM 04.08 section 10.5
+ u_int8_t iei_length = ussd_ie[offset+1];
+ switch(iei) {
+ case GSM48_IE_CAUSE:
+ break;
+ case GSM0480_IE_FACILITY:
+ rc &= parse_facility_ie(ussd_ie+2, iei_length);
+ break;
+ case GSM0480_IE_SS_VERSION:
+ break;
+ default:
+ fprintf(stderr, "Unhandled GSM 04.08 or 04.80 Information Element Identifier 0x%02x\n",
+ iei);
+ rc = 0;
+ break;
+ }
+
+
+ offset += (iei_length+2);
+ }
+ while(offset < length);
+
+ return rc;
+}
+
+static int parse_facility_ie(u_int8_t *facility_ie, u_int8_t length)
+{
+ int rc = 1;
+ u_int8_t offset = 0;
+
+ do
+ {
+ u_int8_t component_type = facility_ie[offset]; // Component Type tag - table 3.7
+ 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);
+ 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)
+{
+ int rc = 1;
+
+ if(invoke_data[0] != GSM0480_COMPIDTAG_INVOKE_ID) // mandatory part
+ {
+ fprintf(stderr, "Unexpected GSM 04.80 Component-ID tag 0x%02x (expecting Invoke ID tag)\n",
+ invoke_data[0]);
+ }
+ u_int8_t offset = invoke_data[1] + 2;
+
+ if(invoke_data[offset] == GSM0480_COMPIDTAG_LINKED_ID) // optional part
+ offset += invoke_data[offset+1] + 2; // skip over it
+
+ if(invoke_data[offset] == GSM0480_OPERATION_CODE) // mandatory part
+ {
+ 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 + 3, length - 3);
+ 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)
+{
+ int rc = 1;
+ u_int8_t dcs;
+
+ /* FIXME: properly parse out the initial tag and length, then the data-coding scheme and finally the text -
+ following piece of code uses hard-coded offsets into the data */
+ dcs = uss_req_data[7];
+ DEBUGP(DMM, "Data coding scheme = 0x%2.2X\n", dcs); // temporary
+
+ int num_7_bit_chars = (uss_req_data[9] * 8) / 7;
+ gsm_7bit_decode(ussd_string_buff, &(uss_req_data[10]), num_7_bit_chars);
+
+ return rc;
+}
+
+/* !!! Not yet complete or even partly working, causes a test phone to reboot! */
+int gsm0480_send_ussd_response(struct msgb *in_msg, const char* response_text)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh;
+ struct gsm_network *net = in_msg->lchan->ts->trx->bts->network;
+ u_int8_t *ptr8;
+ int response_len, response_pad;
+
+ msg->lchan = in_msg->lchan;
+
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+ gh->proto_discr = GSM48_PDISC_NC_SS;
+ gh->msg_type = GSM0480_MTYPE_FACILITY;
+
+/* FIXME: Need to add lots of stuff here to build up a valid USSD -
+ GSM0480_IE_FACILITY, GSM0480_CTYPE_INVOKE(?), GSM0480_COMPIDTAG_INVOKE_ID,
+ GSM0480_OPERATION_CODE, GSM0480_OP_CODE_PROCESS_USS_REQ(?) */
+
+ response_len = (strlen(response_text)*7)/8;
+ response_pad = (8 - strlen(net->name_long)*7)%8;
+ if (response_pad > 0)
+ response_len++;
+ /* 10.5.3.5a */
+ ptr8 = msgb_put(msg, 19);
+ ptr8[0] = GSM0480_IE_FACILITY;
+ ptr8[1] = response_len + 17;
+ ptr8[2] = GSM0480_CTYPE_RETURN_RESULT;
+ ptr8[3] = response_len + 15;
+ ptr8[4] = GSM0480_COMPIDTAG_INVOKE_ID;
+ ptr8[5] = 1;
+ ptr8[6] = 0x80; // invoke-ID -128
+ ptr8[7] = 0x30; // don't yet understand where this comes from
+ ptr8[8] = response_len + 10;
+ ptr8[9] = GSM0480_OPERATION_CODE;
+ ptr8[10] = 1;
+ ptr8[11] = GSM0480_OP_CODE_PROCESS_USS_REQ;
+ ptr8[12] = 0x30; // don't yet understand where this comes from
+ ptr8[13] = response_len + 5;
+ ptr8[14] = 0x04; // indicates DCS to follow
+ ptr8[15] = 1; // length of DCS
+ ptr8[16] = 0x0F; // DCS
+ ptr8[17] = 0x04; // indicates string to follow
+ ptr8[18] = response_len;
+
+ ptr8 = msgb_put(msg, response_len);
+ gsm_7bit_encode(ptr8, response_text);
+
+ DEBUGP(DMM, "USSD response %s\n", hexdump(msg->data, msg->len)); // preliminary! Just see what we're sending...
+
+ return -EINVAL; /* Temporary */
+// return gsm48_sendmsg(msg, NULL);
+}
+
+/* !!! Not yet complete or even partly working */
+int gsm0480_send_ussd_error(struct msgb *in_msg)
+{
+ return -EINVAL;
+}
diff --git a/openbsc/src/ussd.c b/openbsc/src/ussd.c
new file mode 100644
index 0000000..26b4686
--- /dev/null
+++ b/openbsc/src/ussd.c
@@ -0,0 +1,59 @@
+/* Handler for mobile-originated USSDs */
+
+/* (C) 2008-2009 by Harald Welte <laforge at gnumonks.org>
+ * (C) 2008, 2009 by Holger Hans Peter Freyther <zecke at selfish.org>
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <openbsc/gsm_04_80.h>
+#include <openbsc/gsm_subscriber.h>
+#include <openbsc/debug.h>
+
+#define USSD_TEXT_OWN_NUMBER "*#100#"
+
+static int send_own_number(struct msgb *msg);
+
+int handle_rcv_ussd(struct msgb *msg)
+{
+ char* ussd_text_rcvd = gsm0480_rcv_ussd(msg);
+ DEBUGP(DMM, "Received USSD text %s\n", ussd_text_rcvd); // show text payload entered on MS
+
+ if(strstr(USSD_TEXT_OWN_NUMBER, ussd_text_rcvd) != NULL)
+ {
+ DEBUGP(DMM, "USSD: Own number requested\n");
+ return send_own_number(msg);
+ }
+ else
+ {
+ DEBUGP(DMM, "Unhandled USSD %s\n", ussd_text_rcvd);
+ return gsm0480_send_ussd_error(msg);
+ }
+}
+
+static int send_own_number(struct msgb *msg)
+{
+ char* own_number = msg->lchan->subscr->extension;
+ return gsm0480_send_ussd_response(msg, own_number);
+}
--
1.6.0.4
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Content-Type: text/x-diff;
name="0002-Support-for-mobile-originated-USSD-working-demonst.patch"
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filename*0="0002-Support-for-mobile-originated-USSD-working-demonst.patc";
filename*1="h"