some further gsmd/libgsmd work

git-svn-id: http://svn.openmoko.org/trunk/src/target/gsm@96 99fdad57-331a-0410-800a-d7fa5415bdb3

1 files changed, 65 insertions, 0 deletions

diff --git a/src/libgsmd/libgsmd_passthrough.c b/src/libgsmd/libgsmd_passthrough.c
new file mode 100644
index 0000000..45ce066
--- /dev/null
+++ b/src/libgsmd/libgsmd_passthrough.c
@@ -0,0 +1,65 @@
+#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;
+}