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px4-firmware/apps/netutils/ftpc/ftpc_socket.c

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/****************************************************************************
* apps/netutils/ftpc/ftpc_socket.c
*
* Copyright (C) 2011 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 "ftpc_config.h"
#include <sys/socket.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <debug.h>
#include <errno.h>
#include "ftpc_internal.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ftpc_sockinit
*
* Description:
* Initialize a socket. Create the socket and "wrap" it as C standard
* incoming and outgoing streams.
*
****************************************************************************/
int ftpc_sockinit(FAR struct ftpc_socket_s *sock)
{
/* Initialize the socket structure */
memset(sock, 0, sizeof(struct ftpc_socket_s));
/* Create a socket descriptor */
sock->sd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock->sd < 0)
{
ndbg("socket() failed: %d\n", errno);
goto errout;
}
/* Call fdopen to "wrap" the socket descriptor as an input stream using C
* buffered I/O.
*/
sock->instream = fdopen(sock->sd, "r");
if (!sock->instream)
{
ndbg("fdopen() failed: %d\n", errno);
goto errout_with_sd;
}
/* Call fdopen to "wrap" the socket descriptor as an output stream using C
* buffered I/O.
*/
sock->outstream = fdopen(sock->sd, "w");
if (!sock->outstream)
{
ndbg("fdopen() failed: %d\n", errno);
goto errout_with_instream;
}
return OK;
/* Close the instream. NOTE: Since the underlying socket descriptor is
* *not* dup'ed, the following close should fail harmlessly.
*/
errout_with_instream:
fclose(sock->instream);
sock->instream = NULL;
errout_with_sd:
close(sock->sd);
sock->sd = -1;
errout:
return ERROR;
}
/****************************************************************************
* Name: ftpc_sockclose
*
* Description:
* Close a socket
*
****************************************************************************/
void ftpc_sockclose(struct ftpc_socket_s *sock)
{
/* Note that the same underlying socket descriptor is used for both streams.
* There should be harmless failures on the second fclose and the close.
*/
fclose(sock->instream);
fclose(sock->outstream);
close(sock->sd);
memset(sock, 0, sizeof(struct ftpc_socket_s));
sock->sd = -1;
}
/****************************************************************************
* Name: ftpc_sockconnect
*
* Description:
* Connect the socket to the host. On a failure, the caller should call.
* ftpc_sockclose() to clean up.
*
****************************************************************************/
int ftpc_sockconnect(struct ftpc_socket_s *sock, struct sockaddr_in *addr)
{
int ret;
/* Connect to the server */
ret = connect(sock->sd, (struct sockaddr *)addr, sizeof(struct sockaddr));
if (ret < 0)
{
ndbg("connect() failed: %d\n", errno);
return ERROR;
}
/* Get the local address of the socket */
ret = ftpc_sockgetsockname(sock, &sock->laddr);
if (ret < 0)
{
ndbg("ftpc_sockgetsockname() failed: %d\n", errno);
return ERROR;
}
sock->connected = true;
return OK;
}
/****************************************************************************
* Name: ftpc_sockcopy
*
* Description:
* Copy the socket state from one location to another.
*
****************************************************************************/
void ftpc_sockcopy(FAR struct ftpc_socket_s *dest,
FAR const struct ftpc_socket_s *src)
{
memcpy(&dest->laddr, &src->laddr, sizeof(struct sockaddr_in));
dest->connected = ftpc_sockconnected(src);
}
/****************************************************************************
* Name: ftpc_sockaccept
*
* Description:
* Accept a connection on the data socket. This function is onlly used
* in active mode.
*
* In active mode FTP the client connects from a random port (N>1023) to the
* FTP server's command port, port 21. Then, the client starts listening to
* port N+1 and sends the FTP command PORT N+1 to the FTP server. The server
* will then connect back to the client's specified data port from its local
* data port, which is port 20. In passive mode FTP the client initiates
* both connections to the server, solving the problem of firewalls filtering
* the incoming data port connection to the client from the server. When
* opening an FTP connection, the client opens two random ports locally
* (N>1023 and N+1). The first port contacts the server on port 21, but
* instead of then issuing a PORT command and allowing the server to connect
* back to its data port, the client will issue the PASV command. The result
* of this is that the server then opens a random unprivileged port (P >
* 1023) and sends the PORT P command back to the client. The client then
* initiates the connection from port N+1 to port P on the server to transfer
* data.
*
****************************************************************************/
int ftpc_sockaccept(FAR struct ftpc_socket_s *sock)
{
struct sockaddr addr;
socklen_t addrlen;
/* Any previous socket should have been uninitialized (0) or explicitly
* closed (-1). But the path to this function may include a call to
* ftpc_sockinit(). If so... close that socket and call accept to
* get a new one.
*/
if (sock->sd > 0)
{
ftpc_sockclose(sock);
}
addrlen = sizeof(addr);
sock->sd = accept(sock->sd, &addr, &addrlen);
if (sock->sd == -1)
{
ndbg("accept() failed: %d\n", errno);
return ERROR;
}
memcpy(&sock->laddr, &addr, sizeof(sock->laddr));
/* Create in/out C buffer I/O streams on the data channel. First,
* create the incoming buffered stream.
*/
sock->instream = fdopen(sock->sd, "r");
if (!sock->instream)
{
ndbg("fdopen() failed: %d\n", errno);
goto errout_with_sd;
}
/* Create the outgoing stream */
sock->outstream = fdopen(sock->sd, "w");
if (!sock->outstream)
{
ndbg("fdopen() failed: %d\n", errno);
goto errout_with_instream;
}
return OK;
/* Close the instream. NOTE: Since the underlying socket descriptor is
* *not* dup'ed, the following close should fail harmlessly.
*/
errout_with_instream:
fclose(sock->instream);
sock->instream = NULL;
errout_with_sd:
close(sock->sd);
sock->sd = -1;
return ERROR;
}
/****************************************************************************
* Name: ftpc_socklisten
*
* Description:
* Bind the socket to local address and wait for connection from the server.
*
****************************************************************************/
int ftpc_socklisten(struct ftpc_socket_s *sock)
{
unsigned int addrlen = sizeof(sock->laddr);
int ret;
/* Bind the local socket to the local address */
sock->laddr.sin_port = 0;
ret = bind(sock->sd, (struct sockaddr *)&sock->laddr, addrlen);
if (ret < 0)
{
ndbg("bind() failed: %d\n", errno);
return ERROR;
}
/* Wait for the connection to the server */
if (listen(sock->sd, 1) == -1)
{
return ERROR;
}
/* Then get the local address selected by NuttX */
ret = ftpc_sockgetsockname(sock, &sock->laddr);
return ret;
}
/****************************************************************************
* Name: ftpc_sockprintf
*
* Description:
* printf to a socket stream
*
****************************************************************************/
int ftpc_sockprintf(struct ftpc_socket_s *sock, const char *fmt, ...)
{
va_list ap;
int r;
va_start(ap, fmt);
r = vfprintf(sock->outstream, fmt, ap);
va_end(ap);
return r;
}
/****************************************************************************
* Name: ftpc_sockgetsockname
*
* Description:
* Get the address of the local socket
*
****************************************************************************/
int ftpc_sockgetsockname(FAR struct ftpc_socket_s *sock,
FAR struct sockaddr_in *addr)
{
socklen_t len = sizeof(struct sockaddr_in);
int ret;
ret = getsockname(sock->sd, (FAR struct sockaddr *)addr, &len);
if (ret < 0)
{
ndbg("getsockname failed: %d\n", errno);
return ERROR;
}
return OK;
}
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