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/* RF Ctl handling socket */
/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2010 by On-Waves
* 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 <openbsc/bsc_msc_rf.h>
#include <openbsc/debug.h>
#include <openbsc/gsm_data.h>
#include <osmocore/talloc.h>
#include <osmocore/protocol/gsm_12_21.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <unistd.h>
#define RF_CMD_QUERY '?'
#define RF_CMD_OFF '0'
#define RF_CMD_ON '1'
static int lock_each_trx(struct gsm_network *net, int lock)
{
struct gsm_bts *bts;
llist_for_each_entry(bts, &net->bts_list, list) {
struct gsm_bts_trx *trx;
llist_for_each_entry(trx, &bts->trx_list, list) {
gsm_trx_lock_rf(trx, lock);
}
}
return 0;
}
/*
* Send a '1' when one TRX is online, otherwise send 0
*/
static void handle_query(struct bsc_msc_rf_conn *conn)
{
struct msgb *msg;
struct gsm_bts *bts;
char send = '0';
llist_for_each_entry(bts, &conn->gsm_network->bts_list, list) {
struct gsm_bts_trx *trx;
llist_for_each_entry(trx, &bts->trx_list, list) {
if (trx->nm_state.availability == NM_AVSTATE_OK &&
trx->nm_state.operational != NM_STATE_LOCKED) {
send = '1';
break;
}
}
}
msg = msgb_alloc(10, "RF Query");
if (!msg) {
LOGP(DINP, LOGL_ERROR, "Failed to allocate response msg.\n");
return;
}
msg->l2h = msgb_put(msg, 1);
msg->l2h[0] = send;
if (write_queue_enqueue(&conn->queue, msg) != 0) {
LOGP(DINP, LOGL_ERROR, "Failed to enqueue the answer.\n");
msgb_free(msg);
return;
}
return;
}
static int rf_read_cmd(struct bsc_fd *fd)
{
struct bsc_msc_rf_conn *conn = fd->data;
char buf[1];
int rc;
rc = read(fd->fd, buf, sizeof(buf));
if (rc != sizeof(buf)) {
LOGP(DINP, LOGL_ERROR, "Short read %d/%s\n", errno, strerror(errno));
bsc_unregister_fd(fd);
close(fd->fd);
write_queue_clear(&conn->queue);
talloc_free(conn);
return -1;
}
switch (buf[0]) {
case RF_CMD_QUERY:
handle_query(conn);
break;
case RF_CMD_OFF:
lock_each_trx(conn->gsm_network, 1);
break;
case RF_CMD_ON:
lock_each_trx(conn->gsm_network, 0);
break;
default:
LOGP(DINP, LOGL_ERROR, "Unknown command %d\n", buf[0]);
break;
}
return 0;
}
static int rf_write_cmd(struct bsc_fd *fd, struct msgb *msg)
{
int rc;
rc = write(fd->fd, msg->data, msg->len);
if (rc != msg->len) {
LOGP(DINP, LOGL_ERROR, "Short write %d/%s\n", errno, strerror(errno));
return -1;
}
return 0;
}
static int rf_ctl_accept(struct bsc_fd *bfd, unsigned int what)
{
struct bsc_msc_rf_conn *conn;
struct bsc_msc_rf *rf = bfd->data;
struct sockaddr_un addr;
socklen_t len = sizeof(addr);
int fd;
fd = accept(bfd->fd, (struct sockaddr *) &addr, &len);
if (fd < 0) {
LOGP(DINP, LOGL_ERROR, "Failed to accept. errno: %d/%s\n",
errno, strerror(errno));
return -1;
}
conn = talloc_zero(rf, struct bsc_msc_rf_conn);
if (!conn) {
LOGP(DINP, LOGL_ERROR, "Failed to allocate mem.\n");
close(fd);
return -1;
}
write_queue_init(&conn->queue, 10);
conn->queue.bfd.data = conn;
conn->queue.bfd.fd = fd;
conn->queue.bfd.when = BSC_FD_READ | BSC_FD_WRITE;
conn->queue.read_cb = rf_read_cmd;
conn->queue.write_cb = rf_write_cmd;
conn->gsm_network = rf->gsm_network;
if (bsc_register_fd(&conn->queue.bfd) != 0) {
close(fd);
talloc_free(conn);
return -1;
}
return 0;
}
struct bsc_msc_rf *bsc_msc_rf_create(const char *path, struct gsm_network *net)
{
unsigned int namelen;
struct sockaddr_un local;
struct bsc_fd *bfd;
struct bsc_msc_rf *rf;
int rc;
rf = talloc_zero(NULL, struct bsc_msc_rf);
if (!rf) {
LOGP(DINP, LOGL_ERROR, "Failed to create bsc_msc_rf.\n");
return NULL;
}
bfd = &rf->listen;
bfd->fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (bfd->fd < 0) {
LOGP(DINP, LOGL_ERROR, "Can not create socket. %d/%s\n",
errno, strerror(errno));
return NULL;
}
local.sun_family = AF_UNIX;
strncpy(local.sun_path, path, sizeof(local.sun_path));
local.sun_path[sizeof(local.sun_path) - 1] = '\0';
unlink(local.sun_path);
/* we use the same magic that X11 uses in Xtranssock.c for
* calculating the proper length of the sockaddr */
#if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
local.sun_len = strlen(local.sun_path);
#endif
#if defined(BSD44SOCKETS) || defined(SUN_LEN)
namelen = SUN_LEN(&local);
#else
namelen = strlen(local.sun_path) +
offsetof(struct sockaddr_un, sun_path);
#endif
rc = bind(bfd->fd, (struct sockaddr *) &local, namelen);
if (rc != 0) {
LOGP(DINP, LOGL_ERROR, "Failed to bind '%s' errno: %d/%s\n",
local.sun_path, errno, strerror(errno));
close(bfd->fd);
talloc_free(rf);
return NULL;
}
if (listen(bfd->fd, 0) != 0) {
LOGP(DINP, LOGL_ERROR, "Failed to listen: %d/%s\n", errno, strerror(errno));
close(bfd->fd);
talloc_free(rf);
return NULL;
}
bfd->when = BSC_FD_READ;
bfd->cb = rf_ctl_accept;
bfd->data = rf;
if (bsc_register_fd(bfd) != 0) {
LOGP(DINP, LOGL_ERROR, "Failed to register bfd.\n");
close(bfd->fd);
talloc_free(rf);
return NULL;
}
rf->gsm_network = net;
return rf;
}
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