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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <gsmd/usock.h>
#include <libgsmd/libgsmd.h>
#include "lgsm_internals.h"
static u_int16_t next_msg_id;
static int lgsm_send(struct lgsm_handle *lh, struct gsmd_msg_hdr *gmh)
{
gmh->id = next_msg_id++;
return send(lh->fd, (char *) gmh, sizeof(*gmh) + gmh->len);
}
#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(struct lgsm_handle *lh, const char *tx, char *rx, unsigned int *rx_len)
{
struct gsmd_msg_hdr *gmh = (struct gsmd_msg_hdr *)passthrough_buf;
struct gsmd_msg_hdr *rgmh = (struct gsmd_msg_hdr *)passthrough_rbuf;
char *tx_buf = (char *)gmh + sizeof(*gmh);
char *rx_buf = (char *)rgmh + sizeof(*rgmh);
int len = strlen(tx);
int rc;
if (len > PT_BUF_SIZE)
return -EINVAL;
gmh->version = GSMD_PROTO_VERSION;
gmh->msg_type = GSMD_MSG_PASSTHROUGH;
gmh->msg_subtype = GSMD_PASSTHROUGH_REQUEST;
gmh->len = len;
strcpy(tx_buf, tx);
rc = lgsm_send(lh, gmh);
if (rc < len+sizeof(*gmh))
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, gmh->id, passthrough_rbuf, sizeof(passthrough_rbuf));
if (rc <= 0)
return rc;
if (rc < sizeof(*rgmh))
return -EINVAL;
if (rc < sizeof(*rgmh) + rgmh->len)
return -EINVAL;
/* FIXME: make sure rx_buf is zero-terminated */
strcpy(rx, rx_buf);
*rx_len = rgmh->len;
return rx_len;
}
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