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nuttx/net/local/local_sockif.c

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/****************************************************************************
* net/local/local_sockif.c
*
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdbool.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <netinet/in.h>
#include <nuttx/net/net.h>
#include <socket/socket.h>
#include "local/local.h"
#ifdef CONFIG_NET_LOCAL
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int local_setup(FAR struct socket *psock, int protocol);
static sockcaps_t local_sockcaps(FAR struct socket *psock);
static void local_addref(FAR struct socket *psock);
static int local_bind(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen);
static int local_getsockname(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR socklen_t *addrlen);
#ifndef CONFIG_NET_LOCAL_STREAM
static int local_listen(FAR struct socket *psock, int backlog);
#endif
static int local_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen);
#ifndef CONFIG_NET_LOCAL_STREAM
static int local_accept(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR socklen_t *addrlen,
FAR struct socket *newsock);
#endif
#ifndef CONFIG_DISABLE_POLL
static int local_poll(FAR struct socket *psock,
FAR struct pollfd *fds, bool setup);
#endif
static ssize_t local_send(FAR struct socket *psock, FAR const void *buf,
size_t len, int flags);
static ssize_t local_sendto(FAR struct socket *psock, FAR const void *buf,
size_t len, int flags, FAR const struct sockaddr *to,
socklen_t tolen);
static int local_close(FAR struct socket *psock);
/****************************************************************************
* Public Data
****************************************************************************/
const struct sock_intf_s g_local_sockif =
{
local_setup, /* si_setup */
local_sockcaps, /* si_sockcaps */
local_addref, /* si_addref */
local_bind, /* si_bind */
local_getsockname, /* si_getsockname */
local_listen, /* si_listen */
local_connect, /* si_connect */
local_accept, /* si_accept */
#ifndef CONFIG_DISABLE_POLL
local_poll, /* si_poll */
#endif
local_send, /* si_send */
local_sendto, /* si_sendto */
#ifdef CONFIG_NET_SENDFILE
NULL, /* si_sendfile */
#endif
local_recvfrom, /* si_recvfrom */
local_close /* si_close */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: local_sockif_alloc
*
* Description:
* Allocate and attach a local, Unix domain connection structure.
*
****************************************************************************/
#if defined(CONFIG_NET_LOCAL_STREAM) || defined(CONFIG_NET_LOCAL_DGRAM)
static int local_sockif_alloc(FAR struct socket *psock)
{
/* Allocate the local connection structure */
FAR struct local_conn_s *conn = local_alloc();
if (conn == NULL)
{
/* Failed to reserve a connection structure */
return -ENOMEM;
}
/* Set the reference count on the connection structure. This reference
* count will be incremented only if the socket is dup'ed
*/
DEBUGASSERT(conn->lc_crefs == 0);
conn->lc_crefs = 1;
/* Save the pre-allocated connection in the socket structure */
psock->s_conn = conn;
return OK;
}
#endif
/****************************************************************************
* Name: local_setup
*
* Description:
* Called for socket() to verify that the provided socket type and
* protocol are usable by this address family. Perform any family-
* specific socket fields.
*
* Parameters:
* psock A pointer to a user allocated socket structure to be initialized.
* protocol (see sys/socket.h)
*
* Returned Value:
* Zero (OK) is returned on success. Otherwise, a negater errno value is
* returned.
*
****************************************************************************/
static int local_setup(FAR struct socket *psock, int protocol)
{
/* Allocate the appropriate connection structure. This reserves the
* the connection structure is is unallocated at this point. It will
* not actually be initialized until the socket is connected.
*
* Only SOCK_STREAM and SOCK_DGRAM and possible SOCK_RAW are supported.
*/
switch (psock->s_type)
{
#ifdef CONFIG_NET_LOCAL_STREAM
case SOCK_STREAM:
if (protocol != 0 && protocol != IPPROTO_TCP)
{
return -EPROTONOSUPPORT;
}
/* Allocate and attach the local connection structure */
return local_sockif_alloc(psock);
#endif /* CONFIG_NET_LOCAL_STREAM */
#ifdef CONFIG_NET_LOCAL_DGRAM
case SOCK_DGRAM:
if (protocol != 0 && protocol != IPPROTO_UDP)
{
return -EPROTONOSUPPORT;
}
/* Allocate and attach the local connection structure */
return local_sockif_alloc(psock);
#endif /* CONFIG_NET_LOCAL_DGRAM */
default:
return -EPROTONOSUPPORT;
}
}
/****************************************************************************
* Name: local_sockcaps
*
* Description:
* Return the bit encoded capabilities of this socket.
*
* Parameters:
* psock - Socket structure of the socket whose capabilities are being
* queried.
*
* Returned Value:
* The set of socket cababilities is returned.
*
****************************************************************************/
static sockcaps_t local_sockcaps(FAR struct socket *psock)
{
return SOCKCAP_NONBLOCKING;
}
/****************************************************************************
* Name: local_addref
*
* Description:
* Increment the refernce count on the underlying connection structure.
*
* Parameters:
* psock - Socket structure of the socket whose reference count will be
* incremented.
*
* Returned Value:
* None
*
****************************************************************************/
static void local_addref(FAR struct socket *psock)
{
FAR struct local_conn_s *conn;
DEBUGASSERT(psock != NULL && psock->s_conn != NULL &&
psock->s_domain == PF_LOCAL);
conn = psock->s_conn;
DEBUGASSERT(conn->lc_crefs > 0 && conn->lc_crefs < 255);
conn->lc_crefs++;
}
/****************************************************************************
* Name: local_bind
*
* Description:
* local_bind() gives the socket 'psock' the local address 'addr'. 'addr'
* is 'addrlen' bytes long. Traditionally, this is called "assigning a
* name to a socket." When a socket is created with socket(), it exists
* in a name space (address family) but has no name assigned.
*
* Parameters:
* psock Socket structure of the socket to bind
* addr Socket local address
* addrlen Length of 'addr'
*
* Returned Value:
* 0 on success; A negated errno value is returned on failure. See
* bind() for a list a appropriate error values.
*
****************************************************************************/
static int local_bind(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen)
{
int ret;
/* Verify that a valid address has been provided */
if (addr->sa_family != AF_LOCAL || addrlen < sizeof(sa_family_t))
{
nerr("ERROR: Invalid address length: %d < %d\n",
addrlen, sizeof(sa_family_t));
return -EBADF;
}
/* Perform the binding depending on the protocol type */
switch (psock->s_type)
{
/* Bind a local TCP/IP stream or datagram socket */
#if defined(CONFIG_NET_LOCAL_STREAM) || defined(CONFIG_NET_LOCAL_DGRAM)
#ifdef CONFIG_NET_LOCAL_STREAM
case SOCK_STREAM:
#endif
#ifdef CONFIG_NET_LOCAL_DGRAM
case SOCK_DGRAM:
#endif
{
/* Bind the Unix domain connection structure */
ret = psock_local_bind(psock, addr, addrlen);
/* Mark the socket bound */
if (ret >= 0)
{
psock->s_flags |= _SF_BOUND;
}
}
break;
#endif /* CONFIG_NET_LOCAL_STREAM || CONFIG_NET_LOCAL_DGRAM */
default:
ret = -EBADF;
break;
}
return ret;
}
/****************************************************************************
* Name: local_getsockname
*
* Description:
* The local_getsockname() function retrieves the locally-bound name of
* the specified local socket, stores this address in the sockaddr
* structure pointed to by the 'addr' argument, and stores the length of
* this address in the object pointed to by the 'addrlen' argument.
*
* If the actual length of the address is greater than the length of the
* supplied sockaddr structure, the stored address will be truncated.
*
* If the socket has not been bound to a local name, the value stored in
* the object pointed to by address is unspecified.
*
* Parameters:
* psock Socket structure of the socket to be queried
* addr sockaddr structure to receive data [out]
* addrlen Length of sockaddr structure [in/out]
*
* Returned Value:
* On success, 0 is returned, the 'addr' argument points to the address
* of the socket, and the 'addrlen' argument points to the length of the
* address. Otherwise, a negated errno value is returned. See
* getsockname() for the list of appropriate error numbers.
*
****************************************************************************/
static int local_getsockname(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen)
{
FAR struct sockaddr_un *unaddr = (FAR struct sockaddr_un *)addr;
FAR struct local_conn_s *conn;
DEBUGASSERT(psock != NULL && psock->s_conn != NULL &&
unaddr != NULL && addrlen != NULL &&
*addrlen >= sizeof(sa_family_t));
if (*addrlen < sizeof(sa_family_t))
{
/* This is apparently not an error */
*addrlen = 0;
return OK;
}
conn = (FAR struct local_conn_s *)psock->s_conn;
/* Save the address family */
unaddr->sun_family = AF_LOCAL;
if (*addrlen > sizeof(sa_family_t))
{
/* Now copy the address description. */
if (conn->lc_type == LOCAL_TYPE_UNNAMED)
{
/* Zero-length sun_path... This is an abstract Unix domain socket */
*addrlen = sizeof(sa_family_t);
}
else /* conn->lctype = LOCAL_TYPE_PATHNAME */
{
/* Get the full length of the socket name (including null terminator) */
int namelen = strlen(conn->lc_path) + 1;
/* Get the available length in the user-provided buffer. */
int pathlen = *addrlen - sizeof(sa_family_t);
/* Clip the socket name size so that if fits in the user buffer */
if (pathlen < namelen)
{
namelen = pathlen;
}
/* Copy the path into the user address structure */
(void)strncpy(unaddr->sun_path, conn->lc_path, namelen);
unaddr->sun_path[pathlen - 1] = '\0';
*addrlen = sizeof(sa_family_t) + namelen;
}
}
return OK;
}
/****************************************************************************
* Name: local_listen
*
* Description:
* To accept connections, a socket is first created with psock_socket(), a
* willingness to accept incoming connections and a queue limit for
* incoming connections are specified with psock_listen(), and then the
* connections are accepted with psock_accept(). For the case of local
* unix sockets, psock_listen() calls this function. The psock_listen()
* call applies only to sockets of type SOCK_STREAM or SOCK_SEQPACKET.
*
* Parameters:
* psock Reference to an internal, boound socket structure.
* backlog The maximum length the queue of pending connections may grow.
* If a connection request arrives with the queue full, the client
* may receive an error with an indication of ECONNREFUSED or,
* if the underlying protocol supports retransmission, the request
* may be ignored so that retries succeed.
*
* Returned Value:
* On success, zero is returned. On error, a negated errno value is
* returned. See list() for the set of appropriate error values.
*
****************************************************************************/
#ifndef CONFIG_NET_LOCAL_STREAM
int local_listen(FAR struct socket *psock, int backlog)
{
return -EOPNOTSUPP;
}
#endif
/****************************************************************************
* Name: local_connect
*
* Description:
* local_connect() connects the local socket referred to by the structure
* 'psock' to the address specified by 'addr'. The addrlen argument
* specifies the size of 'addr'. The format of the address in 'addr' is
* determined by the address space of the socket 'psock'.
*
* If the socket 'psock' is of type SOCK_DGRAM then 'addr' is the address
* to which datagrams are sent by default, and the only address from which
* datagrams are received. If the socket is of type SOCK_STREAM or
* SOCK_SEQPACKET, this call attempts to make a connection to the socket
* that is bound to the address specified by 'addr'.
*
* Generally, connection-based protocol sockets may successfully
* local_connect() only once; connectionless protocol sockets may use
* local_connect() multiple times to change their association.
* Connectionless sockets may dissolve the association by connecting to
* an address with the sa_family member of sockaddr set to AF_UNSPEC.
*
* Parameters:
* psock Pointer to a socket structure initialized by psock_socket()
* addr Server address (form depends on type of socket)
* addrlen Length of actual 'addr'
*
* Returned Value:
* 0 on success; a negated errno value on failue. See connect() for the
* list of appropriate errno values to be returned.
*
****************************************************************************/
static int local_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen)
{
/* Verify that a valid address has been provided */
if (addr->sa_family != AF_LOCAL || addrlen < sizeof(sa_family_t))
{
return -EBADF;
}
/* Perform the connection depending on the protocol type */
switch (psock->s_type)
{
#ifdef CONFIG_NET_LOCAL_STREAM
case SOCK_STREAM:
{
/* Verify that the socket is not already connected */
if (_SS_ISCONNECTED(psock->s_flags))
{
return -EISCONN;
}
/* It's not... Connect to the local Unix domain server */
return psock_local_connect(psock, addr);
}
break;
#endif /* CONFIG_NET_LOCAL_STREAM */
#ifdef CONFIG_NET_LOCAL_DGRAM
case SOCK_DGRAM:
{
/* Perform the datagram connection logic */
#warning Missing logic
return -ENOSYS;
}
break;
#endif /* CONFIG_NET_LOCAL_DGRAM */
default:
return -EBADF;
}
}
/****************************************************************************
* Name: local_accept
*
* Description:
* The pkt_accept function is used with connection-based socket types
* (SOCK_STREAM, SOCK_SEQPACKET and SOCK_RDM). It extracts the first
* connection request on the queue of pending connections, creates a new
* connected socket with mostly the same properties as 'sockfd', and
* allocates a new socket descriptor for the socket, which is returned. The
* newly created socket is no longer in the listening state. The original
* socket 'sockfd' is unaffected by this call. Per file descriptor flags
* are not inherited across an pkt_accept.
*
* The 'sockfd' argument is a socket descriptor that has been created with
* socket(), bound to a local address with bind(), and is listening for
* connections after a call to listen().
*
* On return, the 'addr' structure is filled in with the address of the
* connecting entity. The 'addrlen' argument initially contains the size
* of the structure pointed to by 'addr'; on return it will contain the
* actual length of the address returned.
*
* If no pending connections are present on the queue, and the socket is
* not marked as non-blocking, pkt_accept blocks the caller until a
* connection is present. If the socket is marked non-blocking and no
* pending connections are present on the queue, pkt_accept returns
* EAGAIN.
*
* Parameters:
* psock Reference to the listening socket structure
* addr Receives the address of the connecting client
* addrlen Input: allocated size of 'addr', Return: returned size of 'addr'
* newsock Location to return the accepted socket information.
*
* Returned Value:
* Returns 0 (OK) on success. On failure, it returns a negated errno
* value. See accept() for a desrciption of the approriate error value.
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
#ifndef CONFIG_NET_LOCAL_STREAM
static int local_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
FAR socklen_t *addrlen, FAR struct socket *newsock)
{
return -EAFNOSUPPORT;
}
#endif
/****************************************************************************
* Name: local_poll
*
* Description:
* The standard poll() operation redirects operations on socket descriptors
* to local_poll which, indiectly, calls to function.
*
* Input Parameters:
* psock - An instance of the internal socket structure.
* fds - The structure describing the events to be monitored, OR NULL if
* this is a request to stop monitoring events.
* setup - true: Setup up the poll; false: Teardown the poll
*
* Returned Value:
* 0: Success; Negated errno on failure
*
****************************************************************************/
#ifndef CONFIG_DISABLE_POLL
static int local_poll(FAR struct socket *psock, FAR struct pollfd *fds,
bool setup)
{
#ifndef HAVE_LOCAL_POLL
return -ENOSYS;
#else
/* Check if we are setting up or tearing down the poll */
if (setup)
{
/* Perform the TCP/IP poll() setup */
return local_pollsetup(psock, fds);
}
else
{
/* Perform the TCP/IP poll() teardown */
return local_pollteardown(psock, fds);
}
#endif /* HAVE_LOCAL_POLL */
}
#endif /* !CONFIG_DISABLE_POLL */
/****************************************************************************
* Name: local_send
*
* Description:
* Implements the send() operation for the case of the local, Unix socket.
*
* Parameters:
* psock An instance of the internal socket structure.
* buf Data to send
* len Length of data to send
* flags Send flags
*
* Returned Value:
* On success, returns the number of characters sent. On error, a negated
* errno value is returned (see send() for the list of appropriate error
* values.
*
****************************************************************************/
static ssize_t local_send(FAR struct socket *psock, FAR const void *buf,
size_t len, int flags)
{
ssize_t ret;
switch (psock->s_type)
{
#ifdef CONFIG_NET_LOCAL_STREAM
case SOCK_STREAM:
{
/* Local TCP packet send */
ret = psock_local_send(psock, buf, len, flags);
}
break;
#endif /* CONFIG_NET_LOCAL_STREAM */
#ifdef CONFIG_NET_LOCAL_DGRAM
case SOCK_DGRAM:
{
/* Local UDP packet send */
#warning Missing logic
ret = -ENOSYS;
}
break;
#endif /* CONFIG_NET_LOCAL_DGRAM */
default:
{
/* EDESTADDRREQ. Signifies that the socket is not connection-mode
* and no peer address is set.
*/
ret = -EDESTADDRREQ;
}
break;
}
return ret;
}
/****************************************************************************
* Name: local_sendto
*
* Description:
* Implements the sendto() operation for the case of the local, Unix socket.
*
* Parameters:
* psock A pointer to a NuttX-specific, internal socket structure
* buf Data to send
* len Length of data to send
* flags Send flags
* to Address of recipient
* tolen The length of the address structure
*
* Returned Value:
* On success, returns the number of characters sent. On error, a negated
* errno value is returned (see send_to() for the list of appropriate error
* values.
*
****************************************************************************/
ssize_t local_sendto(FAR struct socket *psock, FAR const void *buf,
size_t len, int flags, FAR const struct sockaddr *to,
socklen_t tolen)
{
ssize_t nsent;
/* Verify that a valid address has been provided */
if (to->sa_family != AF_LOCAL || tolen < sizeof(sa_family_t))
{
nerr("ERROR: Unrecognized address family: %d\n",
to->sa_family);
return -EAFNOSUPPORT;
}
#ifdef CONFIG_NET_LOCAL_DGRAM
/* If this is a connected socket, then return EISCONN */
if (psock->s_type != SOCK_DGRAM)
{
nerr("ERROR: Connected socket\n");
return -EISCONN;
}
/* Now handle the local UDP sendto() operation */
nsent = psock_local_sendto(psock, buf, len, flags, to, tolen);
#else
nsent = -EISCONN;
#endif /* CONFIG_NET_LOCAL_DGRAM */
return nsent;
}
/****************************************************************************
* Name: local_close
*
* Description:
* Performs the close operation on a local, Unix socket instance
*
* Parameters:
* psock Socket instance
*
* Returned Value:
* 0 on success; a negated errno value is returned on any failure.
*
* Assumptions:
*
****************************************************************************/
static int local_close(FAR struct socket *psock)
{
/* Perform some pre-close operations for the local address type */
switch (psock->s_type)
{
#if defined(CONFIG_NET_LOCAL_STREAM) || defined(CONFIG_NET_LOCAL_DGRAM)
#ifdef CONFIG_NET_LOCAL_STREAM
case SOCK_STREAM:
#endif
#ifdef CONFIG_NET_LOCAL_DGRAM
case SOCK_DGRAM:
#endif
{
FAR struct local_conn_s *conn = psock->s_conn;
/* Is this the last reference to the connection structure (there
* could be more if the socket was dup'ed).
*/
if (conn->lc_crefs <= 1)
{
conn->lc_crefs = 0;
local_release(conn);
}
else
{
/* No.. Just decrement the reference count */
conn->lc_crefs--;
}
return OK;
}
#endif /* CONFIG_NET_LOCAL_STREAM || CONFIG_NET_LOCAL_DGRAM */
default:
return -EBADF;
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
#endif /* CONFIG_NET_LOCAL */
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