133 lines
3.1 KiB
C
133 lines
3.1 KiB
C
/* Beginnings of an OML router */
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/* Copyright (C) 2015 by Yves Godin <support@nuranwireless.com>
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*
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* Based on sysmoBTS:
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* (C) 2014 by sysmocom s.f.m.c. GmbH
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "oml_router.h"
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#include <osmo-bts/bts.h>
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#include <osmo-bts/logging.h>
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#include <osmo-bts/oml.h>
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#include <osmo-bts/msg_utils.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/core/select.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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static int oml_router_read_cb(struct osmo_fd *fd, unsigned int what)
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{
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struct msgb *msg;
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int rc;
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msg = oml_msgb_alloc();
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if (!msg) {
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LOGP(DL1C, LOGL_ERROR, "Failed to allocate oml msgb.\n");
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return -1;
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}
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rc = recv(fd->fd, msg->tail, msg->data_len, 0);
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if (rc <= 0) {
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close(fd->fd);
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osmo_fd_unregister(fd);
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fd->fd = -1;
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goto err;
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}
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msg->l1h = msgb_put(msg, rc);
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rc = msg_verify_ipa_structure(msg);
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if (rc < 0) {
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LOGP(DL1C, LOGL_ERROR,
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"OML Router: Invalid IPA message rc(%d)\n", rc);
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goto err;
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}
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rc = msg_verify_oml_structure(msg);
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if (rc < 0) {
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LOGP(DL1C, LOGL_ERROR,
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"OML Router: Invalid OML message rc(%d)\n", rc);
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goto err;
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}
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/* todo dispatch message */
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err:
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msgb_free(msg);
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return -1;
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}
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static int oml_router_accept_cb(struct osmo_fd *accept_fd, unsigned int what)
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{
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int fd;
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struct osmo_fd *read_fd = (struct osmo_fd *) accept_fd->data;
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/* Accept only one connection at a time. De-register it */
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if (read_fd->fd > -1) {
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LOGP(DL1C, LOGL_NOTICE,
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"New OML router connection. Closing old one.\n");
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close(read_fd->fd);
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osmo_fd_unregister(read_fd);
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read_fd->fd = -1;
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}
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fd = accept(accept_fd->fd, NULL, NULL);
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if (fd < 0) {
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LOGP(DL1C, LOGL_ERROR, "Failed to accept. errno: %s.\n",
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strerror(errno));
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return -1;
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}
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read_fd->fd = fd;
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if (osmo_fd_register(read_fd) != 0) {
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LOGP(DL1C, LOGL_ERROR, "Registering the read fd failed.\n");
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close(fd);
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read_fd->fd = -1;
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return -1;
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}
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return 0;
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}
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int oml_router_init(struct gsm_bts *bts, const char *path,
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struct osmo_fd *accept_fd, struct osmo_fd *read_fd)
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{
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int rc;
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memset(accept_fd, 0, sizeof(*accept_fd));
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memset(read_fd, 0, sizeof(*read_fd));
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accept_fd->cb = oml_router_accept_cb;
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accept_fd->data = read_fd;
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read_fd->cb = oml_router_read_cb;
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read_fd->data = bts;
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read_fd->when = BSC_FD_READ;
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read_fd->fd = -1;
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rc = osmo_sock_unix_init_ofd(accept_fd, SOCK_SEQPACKET, 0,
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path,
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OSMO_SOCK_F_BIND | OSMO_SOCK_F_NONBLOCK);
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return rc;
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}
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