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

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/****************************************************************************
* apps/netutils/ftpc/ftpc_listdir.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <libgen.h>
#include <errno.h>
#include <debug.h>
#include <apps/ftpc.h>
#include "ftpc_internal.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
typedef void (*callback_t)(FAR const char *name, FAR void *arg);
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: ftpc_dircount
*
* Description:
* This callback simply counts the number of names in the directory.
*
****************************************************************************/
static void ftpc_dircount(FAR const char *name, FAR void *arg)
{
FAR unsigned int *dircount = (FAR unsigned int *)arg;
(*dircount)++;
}
/****************************************************************************
* Name: ftpc_addname
*
* Description:
* This callback adds a name to the directory listing.
*
****************************************************************************/
static void ftpc_addname(FAR const char *name, FAR void *arg)
{
FAR struct ftpc_dirlist_s *dirlist = (FAR struct ftpc_dirlist_s *)arg;
unsigned int nnames = dirlist->nnames;
dirlist->name[nnames] = strdup(name);
dirlist->nnames = nnames + 1;
}
/****************************************************************************
* Name: ftpc_nlstparse
*
* Description:
* Parse the NLST directory response. The NLST response consists of a
* sequence of pathnames. Each pathname is terminated by \r\n.
*
* If a pathname starts with a slash, it represents the pathname. If a
* pathname does not start with a slash, it represents the pathname obtained
* by concatenating the pathname of the directory and the pathname.
*
* IF NLST of directory /pub produces foo\r\nbar\r\n, it refers to the
* pathnames /pub/foo and /pub/bar.
*
****************************************************************************/
static void ftpc_nlstparse(FAR FILE *instream, callback_t callback,
FAR void *arg)
{
char buffer[CONFIG_FTP_MAXPATH+1];
/* Read every filename from the temporary file */
for (;;)
{
/* Read the next line from the file */
if (!fgets(buffer, CONFIG_FTP_MAXPATH, instream))
{
break;
}
/* Remove any trailing CR-LF from the line */
ftpc_stripcrlf(buffer);
/* Check for empty file names */
if (buffer[0] == '\0')
{
break;
}
nvdbg("File: %s\n", buffer);
/* Perform the callback operation */
callback(buffer, arg);
}
}
/****************************************************************************
* Name: ftpc_recvdir
*
* Description:
* Get the directory listing.
*
****************************************************************************/
static int ftpc_recvdir(FAR struct ftpc_session_s *session,
FAR FILE *outstream)
{
int ret;
/* Verify that we are still connected to the server */
if (!ftpc_connected(session))
{
ndbg("Not connected to server\n");
return ERROR;
}
/* Setup for the transfer */
ftpc_xfrreset(session);
ret = ftpc_xfrinit(session);
if (ret != OK)
{
return ERROR;
}
/* Send the "NLST" command. Normally the server responds with a mark
* using code 150:
*
* - "150 File status okay; about to open data connection"
*
* It then stops accepting new connections, attempts to
* send the contents of the directory over the data connection, and
* closes the data connection.
*/
ret = ftpc_cmd(session, "NLST");
if (ret != OK)
{
return ERROR;
}
/* In active mode, we need to accept a connection on the data socket
* (in passive mode, we have already connected the data channel to
* the FTP server).
*/
if (!FTPC_IS_PASSIVE(session))
{
ret = ftpc_sockaccept(&session->data);
if (ret != OK)
{
ndbg("ftpc_sockaccept() failed: %d\n", errno);
return ERROR;
}
}
/* Receive the NLST directory list */
ret = ftpc_recvtext(session, session->data.instream, outstream);
ftpc_sockclose(&session->data);
if (ret != OK)
{
return ERROR;
}
/* Get the server reply. After closing the data connection, the should
* accept the request with:
*
* - "226 Closing data connection" if the entire directory was
* successfully transmitted;
*
* Or reject it with:
*
* - "425 Can't open data connection" if no TCP connection was established
* - "426 - Connection closed; transfer aborted" if the TCP connection was
* established but then broken by the client or by network failure
* - "451 - Requested action aborted: local error in processing" if the
* server had trouble reading the directory from disk.
*
* The server may reject the LIST or NLST request (with code 450 or 550)
* without first responding with a mark. In this case the server does not
* touch the data connection.
*/
fptc_getreply(session);
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ftpc_listdir
*
* Description:
* Get a simple directory listing using NLST:
*
* NLST [<SP> <pathname>] <CRLF>
*
* We could do much, much more here using the LIST or MLST/MLSD commands,
* but the parsing is a bitch. See http://cr.yp.to/ftpparse.html
*
* NOTE: We expect to receive only well structured directory paths. Tilde
* expansion "~/xyz" and relative pathes (abc/def) because we do have
* special knowledge about the home and current directories. But otherwise
* the pathes are expected to be pre-sanitized: No . or .. in paths,
* no '//' in paths, etc.
*
****************************************************************************/
FAR struct ftpc_dirlist_s *ftpc_listdir(SESSION handle,
FAR const char *dirpath)
{
FAR struct ftpc_session_s *session = (FAR struct ftpc_session_s *)handle;
struct ftpc_dirlist_s *dirlist;
FILE *filestream;
FAR char *absrpath;
FAR char *tmpfname;
bool iscurrdir;
unsigned int nnames;
int allocsize;
int ret;
/* Get the absolute path to the directory */
absrpath = ftpc_absrpath(session, dirpath);
ftpc_stripslash(absrpath);
/* Is the directory also the remote current working directory? */
iscurrdir = (strcmp(absrpath, session->currdir) == 0);
/* Create a temporary file to hold the directory listing */
asprintf(&tmpfname, "%s/TMP%d.dat", CONFIG_FTP_TMPDIR, getpid());
filestream = fopen(tmpfname, "w+");
if (!filestream)
{
ndbg("Failed to create %s: %d\n", tmpfname, errno);
free(absrpath);
free(tmpfname);
return NULL;
}
/* "CWD" first so that we get the directory contents, not the
* directory itself.
*/
if (!iscurrdir)
{
ret = ftpc_cmd(session, "CWD %s", absrpath);
if (ret != OK)
{
ndbg("CWD to %s failed\n", absrpath);
}
}
/* Send the NLST command with no arguments to get the entire contents of
* the directory.
*/
ret = ftpc_recvdir(session, filestream);
/* Go back to the correct current working directory */
if (!iscurrdir)
{
int tmpret = ftpc_cmd(session, "CWD %s", session->currdir);
if (tmpret != OK)
{
ndbg("CWD back to to %s failed\n", session->currdir);
}
}
/* Did we successfully receive the directory listing? */
dirlist = NULL;
if (ret == OK)
{
/* Count the number of names in the temporary file */
rewind(filestream);
nnames = 0;
ftpc_nlstparse(filestream, ftpc_dircount, &nnames);
if (!nnames)
{
ndbg("Nothing found in directory\n");
goto errout;
}
nvdbg("nnames: %d\n", nnames);
/* Allocate and initialize a directory container */
allocsize = SIZEOF_FTPC_DIRLIST(nnames);
dirlist = (struct ftpc_dirlist_s *)malloc(allocsize);
if (!dirlist)
{
ndbg("Failed to allocate dirlist\n");
goto errout;
}
/* Then copy all of the directory strings into the container */
rewind(filestream);
dirlist->nnames = 0;
ftpc_nlstparse(filestream, ftpc_addname, dirlist);
DEBUGASSERT(nnames == dirlist->nnames);
}
errout:
fclose(filestream);
free(absrpath);
unlink(tmpfname);
free(tmpfname);
return dirlist;
}
/****************************************************************************
* Name: ftpc_dirfree
*
* Description:
* Release the allocated directory listing.
*
****************************************************************************/
void ftpc_dirfree(FAR struct ftpc_dirlist_s *dirlist)
{
int i;
if (dirlist)
{
/* Free each directory name in the directory container */
for (i = 0; i < dirlist->nnames; i++)
{
/* NULL means that the caller stole the string */
if (dirlist->name[i])
{
free(dirlist->name[i]);
}
}
/* Then free the container itself */
free(dirlist);
}
}
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