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/*
* (C) 2016 by Holger Hans Peter Freyther
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "mncc.h"
#include "mncc_protocol.h"
#include "app.h"
#include "logging.h"
#include <osmocom/core/socket.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <unistd.h>
static void close_connection(struct mncc_connection *conn)
{
osmo_fd_unregister(&conn->fd);
close(conn->fd.fd);
osmo_timer_schedule(&conn->reconnect, 5, 0);
conn->state = MNCC_DISCONNECTED;
if (conn->on_disconnect)
conn->on_disconnect(conn);
}
static void check_hello(struct mncc_connection *conn, char *buf, int rc)
{
struct gsm_mncc_hello *hello;
if (rc != sizeof(*hello)) {
LOGP(DMNCC, LOGL_ERROR, "Hello shorter than expected %d vs. %d\n",
rc, sizeof(*hello));
return close_connection(conn);
}
hello = (struct gsm_mncc_hello *) buf;
LOGP(DMNCC, LOGL_NOTICE, "Got hello message version %d\n", hello->version);
if (hello->version != MNCC_SOCK_VERSION) {
LOGP(DMNCC, LOGL_NOTICE, "Incompatible version(%d) expected %d\n",
hello->version, MNCC_SOCK_VERSION);
return close_connection(conn);
}
conn->state = MNCC_READY;
}
static void mncc_reconnect(void *data)
{
int rc;
struct mncc_connection *conn = data;
rc = osmo_sock_unix_init_ofd(&conn->fd, SOCK_SEQPACKET, 0,
conn->app->mncc.path, OSMO_SOCK_F_CONNECT);
if (rc < 0) {
LOGP(DMNCC, LOGL_ERROR, "Failed to connect(%s). Retrying\n",
conn->app->mncc.path);
conn->state = MNCC_DISCONNECTED;
osmo_timer_schedule(&conn->reconnect, 5, 0);
return;
}
LOGP(DMNCC, LOGL_NOTICE, "Reconnected to %s\n", conn->app->mncc.path);
conn->state = MNCC_WAIT_VERSION;
}
static int mncc_data(struct osmo_fd *fd, unsigned int what)
{
char buf[4096];
uint32_t msg_type;
int rc;
struct mncc_connection *conn = fd->data;
rc = read(fd->fd, buf, sizeof(buf));
if (rc <= 0) {
LOGP(DMNCC, LOGL_ERROR, "Failed to read %d/%s. Re-connecting.\n",
rc, strerror(errno));
goto bad_data;
}
if (rc <= 4) {
LOGP(DMNCC, LOGL_ERROR, "Data too short with: %d\n", rc);
goto bad_data;
}
memcpy(&msg_type, buf, 4);
switch (msg_type) {
case MNCC_SOCKET_HELLO:
check_hello(conn, buf, rc);
break;
default:
LOGP(DMNCC, LOGL_ERROR, "Unhandled message type %d/0x%x\n",
msg_type, msg_type);
break;
}
return 0;
bad_data:
close_connection(conn);
return 0;
}
void mncc_connection_init(struct mncc_connection *conn, struct app_config *cfg)
{
conn->reconnect.cb = mncc_reconnect;
conn->reconnect.data = conn;
conn->fd.cb = mncc_data;
conn->fd.data = conn;
conn->app = cfg;
conn->state = MNCC_DISCONNECTED;
}
void mncc_connection_start(struct mncc_connection *conn)
{
LOGP(DMNCC, LOGL_NOTICE, "Scheduling MNCC connect\n");
osmo_timer_schedule(&conn->reconnect, 0, 0);
}
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