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/* (C) 2019 by Harald Welte <laforge@gnumonks.org>
* All Rights Reserved
*
* SPDX-License-Identifier: AGPL-3.0+
*
* 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 Affero 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 <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/select.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/logging.h>
#include <osmocom/netif/stream.h>
#include "sabp_server.h"
static int sabp_cbc_read_cb(struct osmo_stream_srv *conn)
{
struct osmo_stream_srv_link *link = osmo_stream_srv_get_master(conn);
struct osmo_sabp_server_client *client = osmo_stream_srv_get_data(conn);
struct osmo_sabp_server *srv = osmo_stream_srv_link_get_data(link);
struct osmo_fd *ofd = osmo_stream_srv_get_ofd(conn);
struct msgb *msg = NULL;
int rc;
LOGPSC(client, LOGL_DEBUG, "read_cb rx_msg=%p\n", client->rx_msg);
/* message de-segmentation */
rc = osmo_sabp_recv_buffered(conn, ofd->fd, &msg, &client->rx_msg);
if (rc < 0) {
if (rc == -EAGAIN || rc == -EINTR) {
/* more data needs to be read */
return 0;
} else if (rc == -EPIPE || rc == -ECONNRESET) {
/* lost connection with server */
} else if (rc == 0) {
/* connection closed with server */
}
/* destroy connection */
osmo_stream_srv_destroy(conn);
return -EBADF;
}
OSMO_ASSERT(msg);
LOGPSC(client, LOGL_DEBUG, "Received SABP %s\n", msgb_hexdump(msg));
/* decode + dispatch message */
decoded =...;
if (decoded) {
LOGPSC(client, LOGL_INFO, "Received SABP %s\n",
get_value_string(FIXME));
srv->rx_cb(client, decoded);
} else {
LOGPSC(client, LOGL_ERROR, "Unable to decode %s\n", msgb_hexdump(msg));
}
}
static int sabp_server_closed_cb(struct osmo_stream_srv *conn)
{
struct osmo_sabp_server_client *client = osmo_stream_srv_get_data(conn);
LOGSC(client, LOGL_INFO, "connection closed\n");
llist_del(&client->list);
osmo_fsm_inst_term(client->fi, OSMO_FSM_TERM_REQUEST, NULL);
talloc_free(client);
return 0;
}
static int sabp_server_accept_cb(struct omso_stream_srv_link *link, int fd)
{
struct osmo_sabp_server *srv = osmo_stream_srv_link_get_data(link);
struct osmo_sabp_server_client *client = talloc_zero(srv, struct osmo_sabp_server_client);
char remote_ip[INET6_ADDRSTRLEN], portbuf[6];
int remote_port;
OSMO_ASSERT(client);
remote_ip[0] = '\0';
portbuf[0] = '\0';
osmo_sock_get_ip_and_port(fd, remote_ip, sizeof(remote_ip), portbuf, sizeof(portbuf), false);
remote_port = atoi(portbuf);
client->conn = osmo_stream_srv_create(link, lnk, fd, sabp_server_read_cb,
sabp_srever_closed_cb, client);
if (!client->conn) {
LOGP(DSABP, LOGL_ERROR, "Unable to create stream server for %s:%d\n",
remote_ip, remote_port);
talloc_free(client);
return -1;
}
client->fi = osmo_fsm_inst_alloc(&sabp_server_fsm, client, client, LOGL_DEBUG, NULL);
if (!client->fi) {
LOGPSC(client, LOGL_ERROR, "Unable to allocate FSM\n");
osmo_stream_srv_destroy(client->conn);
talloc_free(client);
return -1;
}
llist_add_tail(&client->lits, &srv->clients);
/* TODO: Match client to peer? */
LOGPSC(client, LOGL_INFO, "New SABP client connection\n");
osmo_fsm_inst_dispatch(client->fi, SABP_SRV_E_CMD_RESET, NULL);
return 0;
}
#if 0
void sabp_server_client_tx(struct osmo_sabp_cbc_client *client, struct SABP_SABP_PDU_t *sabp)
{
struct msgb *msg = _sabp_gen_msg(pdu);
LOGPSC(client, LOGL_INFO, "Transmitting %s\n",
get_value_string(
if (!msg) {
LOGPSC(client, LOGL_ERROR, "Failed to encode SABP %s\n",
get_value_string());
ASN_STRUCT_FREE(sabp);
return;
}
ASN_STRUCT_FREE(sabp);
osmo_stream_srv_send(client->conn, msg);
}
#endif
void sabp_server_client_close(struct osmo_sabp_server_client *client)
{
osmo_stream_srv_destroy(client->conn);
/* FIXME: do we need to unlink/free the client? */
}
struct osmo_sabp_server *sabp_server_create(void *ctx, const char *bind_ip, int bind_port,
int (*rx_cb)(struct osmo_sabp_server_client *client,
struct SABP_PDU *dec))
{
struct osmo_sabp_server *srv = talloc_zero(ctx, struct osmo_sabp_server);
int rc;
if (bind_port == -1)
bind_port = SABP_TCP_PORT;
OSMO_ASSERT(srv);
srv->rx_cb = rx_cbp;
INIT_LLIST_HEAD(&srv->clients);
srv->link = osmo_stream_srv_link_create(srv);
osmo_stream_srv_link_set_data(srv->link, srv);
osmo_stream_srv_link_set_nodelay(srv->link, true);
osmo_stream_srv_link_set_port(srv->link, bind_port);
if (bind_ip)
osmo_stream_srv_link_set_addr(srv->link, bind_ip);
osmo_stream_srv_link_set_accept_cb(srv->link, sabp_server_accept_cb);
rc = osmo_stream_serv_link_open(srv->link);
OSMO_ASSERT(rc == 0);
LOGP(DSABP, LOGL_NOTICE, "Listening for SABP at %s\n",
osmo_stream_srv_link_get_sockname(srv->link));
return srv;
}
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