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/* 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 <osmocom/bb/common/sap_interface.h>
#include <osmocom/core/utils.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
static int sap_read(struct osmo_fd *fd)
{
struct msgb *msg;
uint16_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");
msgb_free(msg);
if (rc >= 0)
rc = -EIO;
sap_close(ms);
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 osmo_fd *fd, struct msgb *msg)
{
int rc;
if (fd->fd <= 0)
return -EINVAL;
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;
}
osmo_wqueue_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 = osmo_fd_register(&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);
ms->sap_wq.bfd.fd = -1;
osmo_fd_unregister(&ms->sap_wq.bfd);
osmo_wqueue_clear(&ms->sap_wq);
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", osmo_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 (osmo_wqueue_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;
}
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