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-rw-r--r--src/host/layer23/src/common/sap_interface.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/src/host/layer23/src/common/sap_interface.c b/src/host/layer23/src/common/sap_interface.c
new file mode 100644
index 00000000..13e30097
--- /dev/null
+++ b/src/host/layer23/src/common/sap_interface.c
@@ -0,0 +1,183 @@
+/* BTSAP socket interface of layer2/3 stack */
+
+/* (C) 2010 by Holger Hans Peter Freyther
+ * (C) 2010 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2010 by Andreas Eversberg <jolly@eversberg.eu>
+ *
+ * All Rights Reserved
+ *
+ * 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/bb/common/osmocom_data.h>
+#include <osmocom/bb/common/logging.h>
+
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include <arpa/inet.h>
+
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define GSM_SAP_LENGTH 300
+#define GSM_SAP_HEADROOM 32
+
+extern int quit;
+
+static int sap_read(struct bsc_fd *fd)
+{
+ struct msgb *msg;
+ u_int16_t len;
+ int rc;
+ struct osmocom_ms *ms = (struct osmocom_ms *) fd->data;
+
+ msg = msgb_alloc_headroom(GSM_SAP_LENGTH+GSM_SAP_HEADROOM, GSM_SAP_HEADROOM, "Layer2");
+ if (!msg) {
+ LOGP(DSAP, LOGL_ERROR, "Failed to allocate msg.\n");
+ return -ENOMEM;
+ }
+
+ rc = read(fd->fd, &len, sizeof(len));
+ if (rc < sizeof(len)) {
+ fprintf(stderr, "SAP socket failed\n");
+ if (rc >= 0)
+ rc = -EIO;
+ quit = rc;
+ return rc;
+ }
+
+ len = ntohs(len);
+ if (len > GSM_SAP_LENGTH) {
+ LOGP(DSAP, LOGL_ERROR, "Length is too big: %u\n", len);
+ msgb_free(msg);
+ return -EINVAL;
+ }
+
+
+ msg->l1h = msgb_put(msg, len);
+ rc = read(fd->fd, msg->l1h, msgb_l1len(msg));
+ if (rc != msgb_l1len(msg)) {
+ LOGP(DSAP, LOGL_ERROR, "Can not read data: len=%d rc=%d "
+ "errno=%d\n", len, rc, errno);
+ msgb_free(msg);
+ return rc;
+ }
+
+ if (ms->sap_entity.msg_handler)
+ ms->sap_entity.msg_handler(msg, ms);
+
+ return 0;
+}
+
+static int sap_write(struct bsc_fd *fd, struct msgb *msg)
+{
+ int rc;
+
+ rc = write(fd->fd, msg->data, msg->len);
+ if (rc != msg->len) {
+ LOGP(DSAP, LOGL_ERROR, "Failed to write data: rc: %d\n", rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+int sap_open(struct osmocom_ms *ms, const char *socket_path)
+{
+ int rc;
+ struct sockaddr_un local;
+
+ ms->sap_wq.bfd.fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (ms->sap_wq.bfd.fd < 0) {
+ fprintf(stderr, "Failed to create unix domain socket.\n");
+ return ms->sap_wq.bfd.fd;
+ }
+
+ local.sun_family = AF_UNIX;
+ strncpy(local.sun_path, socket_path, sizeof(local.sun_path));
+ local.sun_path[sizeof(local.sun_path) - 1] = '\0';
+
+ rc = connect(ms->sap_wq.bfd.fd, (struct sockaddr *) &local,
+ sizeof(local.sun_family) + strlen(local.sun_path));
+ if (rc < 0) {
+ fprintf(stderr, "Failed to connect to '%s'.\n", local.sun_path);
+ close(ms->sap_wq.bfd.fd);
+ return rc;
+ }
+
+ write_queue_init(&ms->sap_wq, 100);
+ ms->sap_wq.bfd.data = ms;
+ ms->sap_wq.bfd.when = BSC_FD_READ;
+ ms->sap_wq.read_cb = sap_read;
+ ms->sap_wq.write_cb = sap_write;
+
+ rc = bsc_register_fd(&ms->sap_wq.bfd);
+ if (rc != 0) {
+ fprintf(stderr, "Failed to register fd.\n");
+ return rc;
+ }
+
+ return 0;
+}
+
+int sap_close(struct osmocom_ms *ms)
+{
+ if (ms->sap_wq.bfd.fd <= 0)
+ return -EINVAL;
+
+ close(ms->sap_wq.bfd.fd);
+ bsc_unregister_fd(&ms->sap_wq.bfd);
+
+ return 0;
+}
+
+int osmosap_send(struct osmocom_ms *ms, struct msgb *msg)
+{
+ uint16_t *len;
+
+ if (ms->sap_wq.bfd.fd <= 0)
+ return -EINVAL;
+
+ DEBUGP(DSAP, "Sending: '%s'\n", hexdump(msg->data, msg->len));
+
+ if (msg->l1h != msg->data)
+ LOGP(DSAP, LOGL_ERROR, "Message SAP header != Message Data\n");
+
+ /* prepend 16bit length before sending */
+ len = (uint16_t *) msgb_push(msg, sizeof(*len));
+ *len = htons(msg->len - sizeof(*len));
+
+ if (write_queue_enqueue(&ms->sap_wq, msg) != 0) {
+ LOGP(DSAP, LOGL_ERROR, "Failed to enqueue msg.\n");
+ msgb_free(msg);
+ return -1;
+ }
+
+ return 0;
+}
+
+/* register message handler for messages that are sent from L2->L3 */
+int osmosap_register_handler(struct osmocom_ms *ms, osmosap_cb_t cb)
+{
+ ms->sap_entity.msg_handler = cb;
+
+ return 0;
+}
+