diff options
Diffstat (limited to 'src/host/layer23/src/misc/app_gprs_sniff.c')
| -rw-r--r-- | src/host/layer23/src/misc/app_gprs_sniff.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/src/host/layer23/src/misc/app_gprs_sniff.c b/src/host/layer23/src/misc/app_gprs_sniff.c new file mode 100644 index 00000000..ba17f6c7 --- /dev/null +++ b/src/host/layer23/src/misc/app_gprs_sniff.c @@ -0,0 +1,183 @@ +/* + * GPRS packet sniffer + * + * (C) 2018 by Vadim Yanitskiy <axilirator@gmail.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 <stdint.h> +#include <getopt.h> +#include <errno.h> +#include <stdio.h> + +#include <osmocom/core/msgb.h> +#include <osmocom/core/signal.h> + +#include <osmocom/bb/common/osmocom_data.h> +#include <osmocom/bb/common/l23_app.h> +#include <osmocom/bb/common/logging.h> +#include <osmocom/bb/common/l1ctl.h> + +#include <osmocom/bb/misc/layer3.h> +#include <osmocom/bb/gprs/rlcmac.h> +#include <osmocom/bb/gprs/gsmtap.h> + +#include <l1ctl_proto.h> + +static struct { + uint8_t ts; +} app_data; + +static int l1ctl_signal_cb(unsigned int subsys, + unsigned int signal, void *handler_data, void *signal_data) +{ + struct osmobb_fbsb_res *fr; + struct osmocom_ms *ms; + uint8_t chan_nr, tsc; + + if (subsys != SS_L1CTL) + return 0; + + switch (signal) { + case S_L1CTL_RESET: + ms = (struct osmocom_ms *) signal_data; + + l1ctl_tx_fbsb_req(ms, ms->test_arfcn, + L1CTL_FBSB_F_FB01SB, 300, 0, + CCCH_MODE_NONE, dbm2rxlev(-85)); + break; + case S_L1CTL_FBSB_RESP: + fr = (struct osmobb_fbsb_res *) signal_data; + chan_nr = (0x18 << 3) | app_data.ts; + ms = fr->ms; + tsc = 6; + + l1ctl_tx_dm_est_req_h0(ms, ms->test_arfcn, + chan_nr, tsc, GSM48_CMODE_SIGN, 0x00); + break; + } + + return 0; +} + +static int pdtch_msg_handler(struct osmocom_ms *ms, struct msgb *msg) +{ + struct l1ctl_info_dl *dl; + struct gprs_message *gm; + size_t packet_len; + uint8_t *packet; + + /* Extract the packet and calculate its length */ + packet = (uint8_t *) msg->l3h; + packet_len = msgb_l3len(msg); + + if (!packet_len) { + msgb_free(msg); + return 0; + } + + printf("TRAFFIC IND (%s)\n", osmo_hexdump(packet, packet_len)); + + /* Allocate an instance of 'gprs_message' */ + gm = (struct gprs_message *) malloc(sizeof(*gm) + packet_len); + if (!gm) { + msgb_free(msg); + return -ENOMEM; + } + + /* Fill in downlink info */ + dl = (struct l1ctl_info_dl *) msg->l1h; + gm->arfcn = dl->band_arfcn; + gm->fn = dl->frame_nr; + gm->tn = dl->chan_nr & 0x07; + gm->rxl = dl->rx_level; + gm->snr = dl->snr; + gm->len = packet_len; + + /* Copy the frame itself */ + memcpy(gm->msg, packet, packet_len); + + /* Distribute to RLC/MAC layers */ + rlc_type_handler(gm); + + /* We don't need the source message anymore */ + msgb_free(msg); + free(gm); + + return 0; +} + +int l23_app_init(struct osmocom_ms *ms) +{ + osmo_signal_register_handler(SS_L1CTL, &l1ctl_signal_cb, NULL); + ms->l1_entity.l1_traffic_ind = &pdtch_msg_handler; + + gsmtap_init("127.0.0.1"); + + l1ctl_tx_reset_req(ms, L1CTL_RES_T_FULL); + return 0; +} + +static int l23_cfg_supported() +{ + return L23_OPT_ARFCN | L23_OPT_TAP | L23_OPT_DBG; +} + +static int l23_getopt_options(struct option **options) +{ + static struct option opts[] = { + {"timeslot", 1, 0, 't'} + }; + + *options = opts; + return ARRAY_SIZE(opts); +} + +static int l23_cfg_handle(int c, const char *optarg) +{ + switch (c) { + case 't': + app_data.ts = atoi(optarg); + break; + } + + return 0; +} + +static int l23_cfg_print_help() +{ + printf("\nApplication specific\n"); + printf(" -t --timeslot TS Timeslot index to sniff\n"); + + return 0; +} + +static struct l23_app_info info = { + .copyright = "Copyright (C) 2018 Vadim Yanitskiy <axilirator@gmail.com>\n", + .getopt_string = "t:", + .cfg_supported = l23_cfg_supported, + .cfg_getopt_opt = l23_getopt_options, + .cfg_handle_opt = l23_cfg_handle, + .cfg_print_help = l23_cfg_print_help, +}; + +struct l23_app_info *l23_app_info() +{ + return &info; +} |