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/* gsmtap - How to encapsulate SIM protocol traces in GSMTAP
*
* (C) 2016-2019 by Harald Welte <hwelte@hmw-consulting.de>
*
* 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/simtrace2/gsmtap.h>
#include <osmocom/core/gsmtap.h>
#include <osmocom/core/gsmtap_util.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
/*! global GSMTAP instance */
static struct gsmtap_inst *g_gti;
/*! initialize the global GSMTAP instance for SIM traces */
int osmo_st2_gsmtap_init(const char *gsmtap_host)
{
if (g_gti)
return -EEXIST;
g_gti = gsmtap_source_init(gsmtap_host, GSMTAP_UDP_PORT, 0);
if (!g_gti) {
perror("unable to open GSMTAP");
return -EIO;
}
gsmtap_source_add_sink(g_gti);
return 0;
}
/*! log one APDU via the global GSMTAP instance.
* \param[in] sub_type GSMTAP sub-type (GSMTAP_SIM_* constant)
* \param[in] apdu User-provided buffer with APDU to log
* \param[in] len Length of apdu in bytes
*/
int osmo_st2_gsmtap_send_apdu(uint8_t sub_type, const uint8_t *apdu, unsigned int len)
{
struct gsmtap_hdr *gh;
unsigned int gross_len = len + sizeof(*gh);
uint8_t *buf = malloc(gross_len);
int rc;
if (!buf)
return -ENOMEM;
memset(buf, 0, sizeof(*gh));
gh = (struct gsmtap_hdr *) buf;
gh->version = GSMTAP_VERSION;
gh->hdr_len = sizeof(*gh)/4;
gh->type = GSMTAP_TYPE_SIM;
gh->sub_type = sub_type;
memcpy(buf + sizeof(*gh), apdu, len);
rc = write(gsmtap_inst_fd(g_gti), buf, gross_len);
if (rc < 0) {
perror("write gsmtap");
free(buf);
return rc;
}
free(buf);
return 0;
}
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