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incubator-nuttx/net/local/local_connect.c

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/****************************************************************************
* net/local/local_connect.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/queue.h>
#include <nuttx/net/net.h>
#include <arch/irq.h>
#include <sys/stat.h>
#include <sys/param.h>
#include "utils/utils.h"
#include "socket/socket.h"
#include "local/local.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: local_stream_connect
*
* Description:
* Find a local connection structure that is the appropriate "server"
* connection to be used with the provided "client" connection.
*
* Returned Value:
* Zero (OK) returned on success; A negated errno value is returned on a
* failure. Possible failures include:
*
* Assumptions:
* The network is locked on entry, unlocked on return. This logic is
* an integral part of the lock_connect() implementation and was
* separated out only to improve readability.
*
****************************************************************************/
static int inline local_stream_connect(FAR struct local_conn_s *client,
FAR struct local_conn_s *server,
bool nonblock)
{
FAR struct local_conn_s *conn;
int ret;
int sval;
/* Has server backlog been reached?
* NOTE: The backlog will be zero if listen() has never been called by the
* server.
*/
if (server->lc_state != LOCAL_STATE_LISTENING ||
server->u.server.lc_pending >= server->u.server.lc_backlog)
{
nerr("ERROR: Server is not listening: lc_state=%d\n",
server->lc_state);
nerr(" OR: The backlog limit was reached: %d or %d\n",
server->u.server.lc_pending, server->u.server.lc_backlog);
return -ECONNREFUSED;
}
net_lock();
ret = local_alloc_accept(server, client, &conn);
net_unlock();
if (ret < 0)
{
nerr("ERROR: Failed to alloc accept conn %s: %d\n",
client->lc_path, ret);
return ret;
}
/* Open the client-side write-only FIFO. This should not block and should
* prevent the server-side from blocking as well.
*/
ret = local_open_client_tx(client, conn, nonblock);
if (ret < 0)
{
nerr("ERROR: Failed to open write-only FIFOs for %s: %d\n",
client->lc_path, ret);
goto errout_with_conn;
}
DEBUGASSERT(client->lc_outfile.f_inode != NULL);
client->lc_state = LOCAL_STATE_ACCEPT;
/* Yes.. open the read-only FIFO */
ret = local_open_client_rx(client, conn, nonblock);
if (ret < 0)
{
nerr("ERROR: Failed to open read-only FIFOs for %s: %d\n",
client->lc_path, ret);
goto errout_with_outfd;
}
DEBUGASSERT(client->lc_infile.f_inode != NULL);
/* Increment the number of pending server connections */
server->u.server.lc_pending++;
DEBUGASSERT(server->u.server.lc_pending != 0);
/* Add ourself to the list of waiting connections and notify the server. */
dq_addlast(&conn->u.accept.lc_waiter, &server->u.server.lc_waiters);
local_event_pollnotify(server, POLLIN);
if (nxsem_get_value(&server->lc_waitsem, &sval) >= 0 && sval < 1)
{
nxsem_post(&server->lc_waitsem);
}
client->lc_state = LOCAL_STATE_CONNECTED;
return ret;
errout_with_outfd:
file_close(&client->lc_outfile);
client->lc_outfile.f_inode = NULL;
errout_with_conn:
local_release_fifos(conn);
client->lc_state = LOCAL_STATE_BOUND;
net_lock();
local_free(conn);
net_unlock();
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: local_generate_instance_id
*
* Description:
* Generate instance ID for stream
*
****************************************************************************/
int32_t local_generate_instance_id(void)
{
static int32_t g_next_instance_id = 0;
int32_t id;
/* Called from local_connect with net_lock held. */
id = g_next_instance_id++;
if (g_next_instance_id < 0)
{
g_next_instance_id = 0;
}
return id;
}
/****************************************************************************
* Name: psock_local_connect
*
* Description:
* Find a local connection structure that is the appropriate "server"
* connection to be used with the provided "client" connection.
*
* Returned Value:
* Zero (OK) returned on success; A negated errno value is returned on a
* failure. Possible failures include:
*
* EISCONN - The specified socket is connection-mode and is already
* connected.
* EADDRNOTAVAIL - The specified address is not available from the
* local machine.
* ECONNREFUSED - The target address was not listening for connections or
* refused the connection request because the connection backlog has
* been exceeded.
*
****************************************************************************/
int psock_local_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr)
{
FAR struct local_conn_s *client = psock->s_conn;
FAR struct sockaddr_un *unaddr = (FAR struct sockaddr_un *)addr;
FAR const char *unpath = unaddr->sun_path;
FAR struct local_conn_s *conn = NULL;
uint8_t type = LOCAL_TYPE_PATHNAME;
struct stat buf;
int ret = OK;
if (client->lc_state == LOCAL_STATE_ACCEPT ||
client->lc_state == LOCAL_STATE_CONNECTED)
{
return -EISCONN;
}
if (unpath[0] == '\0')
{
type = LOCAL_TYPE_ABSTRACT;
unpath++;
}
/* Find the matching server connection */
net_lock();
while ((conn = local_nextconn(conn)) != NULL)
{
/* Self found, continue */
if (conn == client)
{
continue;
}
/* Handle according to the server connection type */
switch (conn->lc_type)
{
case LOCAL_TYPE_UNNAMED: /* A Unix socket that is not bound to any name */
break;
case LOCAL_TYPE_ABSTRACT: /* lc_path is length zero */
case LOCAL_TYPE_PATHNAME: /* lc_path holds a null terminated string */
/* Anything in the listener list should be a stream socket in the
* listening state
*/
if (conn->lc_state == LOCAL_STATE_LISTENING &&
conn->lc_type == type && conn->lc_proto == SOCK_STREAM &&
strncmp(conn->lc_path, unpath, UNIX_PATH_MAX - 1) == 0)
{
/* Bind the address and protocol */
client->lc_type = conn->lc_type;
client->lc_proto = conn->lc_proto;
client->lc_instance_id = local_generate_instance_id();
/* The client is now bound to an address */
client->lc_state = LOCAL_STATE_BOUND;
/* We have to do more for the SOCK_STREAM family */
ret = local_stream_connect(client, conn,
_SS_ISNONBLOCK(client->lc_conn.s_flags));
net_unlock();
return ret;
}
break;
default: /* Bad, memory must be corrupted */
DEBUGPANIC(); /* PANIC if debug on */
net_unlock();
return -EINVAL;
}
}
net_unlock();
ret = nx_stat(unpath, &buf, 1);
return ret < 0 ? ret : -ECONNREFUSED;
}
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