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/* libgsmd passthrough
*
* (C) 2006-2007 by OpenMoko, Inc.
* Written by Harald Welte <laforge@openmoko.org>
* All Rights Reserved
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <gsmd/usock.h>
#include <libgsmd/libgsmd.h>
#include "lgsm_internals.h"
#define PT_BUF_SIZE 1024
static char passthrough_buf[sizeof(struct gsmd_msg_hdr)+PT_BUF_SIZE];
static char passthrough_rbuf[sizeof(struct gsmd_msg_hdr)+PT_BUF_SIZE];
int lgsm_passthrough_send(struct lgsm_handle *lh, const char *tx)
{
struct gsmd_msg_hdr *gmh = (struct gsmd_msg_hdr *)passthrough_buf;
char *tx_buf = (char *)gmh + sizeof(*gmh);
int len = strlen(tx);
if (len > PT_BUF_SIZE)
return -EINVAL;
gmh->version = GSMD_PROTO_VERSION;
gmh->msg_type = GSMD_MSG_PASSTHROUGH;
gmh->msg_subtype = GSMD_PASSTHROUGH_REQ;
gmh->len = len+1;
strcpy(tx_buf, tx);
if (lgsm_send(lh, gmh) < len+sizeof(*gmh))
return -EIO;
return gmh->id;
}
int lgsm_passthrough(struct lgsm_handle *lh, const char *tx,
char *rx, unsigned int *rx_len)
{
struct gsmd_msg_hdr *rgmh = (struct gsmd_msg_hdr *)passthrough_rbuf;
char *rx_buf = (char *)rgmh + sizeof(*rgmh);
int rc;
rc = lgsm_passthrough_send(lh, tx);
if (rc < 0)
return rc;
/* since we synchronously want to wait for a response, we need to
* _internally_ loop over incoming packets and call the callbacks for
* intermediate messages (if applicable) */
rc = lgsm_blocking_wait_packet(lh, rc, rgmh, sizeof(passthrough_rbuf));
if (rc <= 0)
return rc;
if (rc < sizeof(*rgmh))
return -EINVAL;
if (rc < sizeof(*rgmh) + rgmh->len)
return -EINVAL;
rx[--*rx_len] = 0;
if (rgmh->len < *rx_len)
*rx_len = rgmh->len;
memcpy(rx, rx_buf, *rx_len);
return *rx_len;
}
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