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https://gitea.osmocom.org/sim-card/simtrace2.git
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83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/* gsmtap - How to encapsulate SIM protocol traces in GSMTAP
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*
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* (C) 2016-2019 by Harald Welte <hwelte@hmw-consulting.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <osmocom/simtrace2/gsmtap.h>
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#include <osmocom/core/gsmtap.h>
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#include <osmocom/core/gsmtap_util.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio.h>
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/*! global GSMTAP instance */
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static struct gsmtap_inst *g_gti;
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/*! initialize the global GSMTAP instance for SIM traces */
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int osmo_st2_gsmtap_init(const char *gsmtap_host)
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{
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if (g_gti)
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return -EEXIST;
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g_gti = gsmtap_source_init(gsmtap_host, GSMTAP_UDP_PORT, 0);
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if (!g_gti) {
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perror("unable to open GSMTAP");
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return -EIO;
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}
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gsmtap_source_add_sink(g_gti);
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return 0;
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}
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/*! log one APDU via the global GSMTAP instance.
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* \param[in] sub_type GSMTAP sub-type (GSMTAP_SIM_* constant)
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* \param[in] apdu User-provided buffer with APDU to log
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* \param[in] len Length of apdu in bytes
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*/
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int osmo_st2_gsmtap_send_apdu(uint8_t sub_type, const uint8_t *apdu, unsigned int len)
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{
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struct gsmtap_hdr *gh;
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unsigned int gross_len = len + sizeof(*gh);
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uint8_t *buf = malloc(gross_len);
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int rc;
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if (!buf)
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return -ENOMEM;
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memset(buf, 0, sizeof(*gh));
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gh = (struct gsmtap_hdr *) buf;
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gh->version = GSMTAP_VERSION;
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gh->hdr_len = sizeof(*gh)/4;
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gh->type = GSMTAP_TYPE_SIM;
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gh->sub_type = sub_type;
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memcpy(buf + sizeof(*gh), apdu, len);
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rc = write(gsmtap_inst_fd(g_gti), buf, gross_len);
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if (rc < 0) {
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perror("write gsmtap");
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free(buf);
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return rc;
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}
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free(buf);
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return 0;
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}
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