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/* Generic TCP connection server (to be moved to libosmocore) */
/* (C) 2012 by Harald Welte <laforge@gnumonks.org>
* 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 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 <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/fcntl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/select.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/write_queue.h>
#include "conn.h"
static int slave_read_cb(struct osmo_fd *ofd)
{
struct osmo_conn *conn = ofd->data;
return conn->link->slave_read_cb(conn);
}
static int slave_write_cb(struct osmo_fd *ofd, struct msgb *msg)
{
int rc;
rc = send(ofd->fd, msg->data, msg->len, 0);
if (rc < 0) {
LOGP(DLINP, LOGL_ERROR, "error %d on send()\n", rc);
}
return rc;
}
static int server_fd_cb(struct osmo_fd *ofd, unsigned int what)
{
int rc;
struct sockaddr_in sa;
socklen_t sa_len = sizeof(sa);
struct osmo_link *link = ofd->data;
struct osmo_conn *conn;
rc = accept(ofd->fd, (struct sockaddr *)&sa, &sa_len);
if (rc < 0)
return rc;
conn = talloc_zero(link, struct osmo_conn);
if (!conn) {
close(rc);
return -ENOMEM;
}
conn->link = link;
osmo_wqueue_init(&conn->queue, link->slave_max_qlen);
conn->queue.read_cb = slave_read_cb;
conn->queue.write_cb = slave_write_cb;
conn->queue.bfd.fd = rc;
conn->queue.bfd.when = BSC_FD_READ | BSC_FD_WRITE;
conn->queue.bfd.data = conn;
osmo_fd_register(&conn->queue.bfd);
conn->remote.host = talloc_strdup(conn, inet_ntoa(sa.sin_addr));
conn->remote.port = ntohs(sa.sin_port);
llist_add_tail(&conn->list, &link->conns);
LOGP(DLINP, LOGL_NOTICE, "accept()ed new UNC link from %s:%u to port %u\n",
conn->remote.host, conn->remote.port, link->port);
if (link->accept_cb)
link->accept_cb(conn);
return 0;
}
struct osmo_link *osmo_link_create(void *ctx, const char *addr, uint16_t port,
int (*read_cb)(struct osmo_conn *),
int slave_max_qlen)
{
struct osmo_link *link;
link = talloc_zero(ctx, struct osmo_link);
if (!link)
return NULL;
link->ofd.when = BSC_FD_READ | BSC_FD_WRITE;
link->ofd.cb = server_fd_cb;
link->ofd.data = link;
link->addr = talloc_strdup(link, addr);
link->port = port;
link->slave_read_cb = read_cb;
link->slave_max_qlen = slave_max_qlen;
INIT_LLIST_HEAD(&link->conns);
return link;
}
int osmo_link_listen(struct osmo_link *link,
void (*accept_cb)(struct osmo_conn *))
{
int rc;
rc = osmo_sock_init(AF_INET, SOCK_STREAM, IPPROTO_TCP,
link->addr, link->port, OSMO_SOCK_F_BIND);
link->ofd.fd = rc;
if (osmo_fd_register(&link->ofd) < 0) {
close(rc);
return -EIO;
}
link->accept_cb = accept_cb;
return 0;
}
int osmo_conn_enqueue(struct osmo_conn *conn, struct msgb *msg)
{
return osmo_wqueue_enqueue(&conn->queue, msg);
}
void osmo_conn_close(struct osmo_conn *conn)
{
close(conn->queue.bfd.fd);
osmo_wqueue_clear(&conn->queue);
osmo_fd_unregister(&conn->queue.bfd);
llist_del(&conn->list);
talloc_free(conn);
}
int osmo_link_close(struct osmo_link *link)
{
struct osmo_conn *conn, *conn2;
osmo_fd_unregister(&link->ofd);
close(link->ofd.fd);
llist_for_each_entry_safe(conn, conn2, &link->conns, list)
osmo_conn_close(conn);
return 0;
}
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