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px4_autopilot/apps/examples/ftpc/ftpc_main.c

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/****************************************************************************
* examples/ftpc/ftpc_main.c
*
* Copyright (C) 2011-2012 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <apps/ftpc.h>
#include <apps/readline.h>
#include "ftpc.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define FTPC_MAX_ARGUMENTS 4
/****************************************************************************
* Public Types
****************************************************************************/
struct cmdmap_s
{
const char *cmd; /* Name of the command */
cmd_t handler; /* Function that handles the command */
uint8_t minargs; /* Minimum number of arguments (including command) */
uint8_t maxargs; /* Maximum number of arguments (including command) */
const char *usage; /* Usage instructions for 'help' command */
};
/****************************************************************************
* Private Data
****************************************************************************/
static const char g_delim[] = " \t\n";
static int cmd_lhelp(SESSION handle, int argc, char **argv);
static int cmd_lunrecognized(SESSION handle, int argc, char **argv);
static const struct cmdmap_s g_cmdmap[] =
{
{ "cd", cmd_rchdir, 2, 2, "<directory>" },
{ "chmod", cmd_rchmod, 3, 3, "<permissions> <path>" },
{ "get", cmd_rget, 2, 4, "[-a|b] <rname> [<lname>]" },
{ "help", cmd_lhelp, 1, 2, "" },
{ "idle", cmd_ridle, 1, 2, "[<idletime>]" },
{ "login", cmd_rlogin, 2, 3, "<uname> [<password>]" },
{ "ls", cmd_rls, 1, 2, "[<dirpath>]" },
{ "quit", cmd_rquit, 1, 1, "" },
{ "mkdir", cmd_rmkdir, 2, 2, "<directory>" },
{ "noop", cmd_rnoop, 1, 1, "" },
{ "put", cmd_rput, 2, 4, "[-a|b] <lname> [<rname>]" },
{ "pwd", cmd_rpwd, 1, 1, "" },
{ "rename", cmd_rrename, 3, 3, "<oldname> <newname>" },
{ "rhelp", cmd_rhelp, 1, 2, "[<command>]" },
{ "rm", cmd_runlink, 2, 2, "" },
{ "rmdir", cmd_rrmdir, 2, 2, "<directory>" },
{ "size", cmd_rsize, 2, 2, "<filepath>" },
{ "time", cmd_rtime, 2, 2, "<filepath>" },
{ "up", cmd_rcdup, 1, 1, "" },
{ NULL, NULL, 1, 1, NULL }
};
static char g_line[CONFIG_FTPC_LINELEN];
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: cmd_lhelp
****************************************************************************/
static int cmd_lhelp(SESSION handle, int argc, char **argv)
{
const struct cmdmap_s *ptr;
printf("Local FTPC commands:\n");
for (ptr = g_cmdmap; ptr->cmd; ptr++)
{
if (ptr->usage)
{
printf(" %s %s\n", ptr->cmd, ptr->usage);
}
else
{
printf(" %s\n", ptr->cmd);
}
}
return OK;
}
/****************************************************************************
* Name: cmd_lunrecognized
****************************************************************************/
static int cmd_lunrecognized(SESSION handle, int argc, char **argv)
{
printf("Command %s unrecognized\n", argv[0]);
return ERROR;
}
/****************************************************************************
* Name: ftpc_argument
****************************************************************************/
char *ftpc_argument(char **saveptr)
{
char *pbegin = *saveptr;
char *pend = NULL;
const char *term;
/* Find the beginning of the next token */
for (;
*pbegin && strchr(g_delim, *pbegin) != NULL;
pbegin++);
/* If we are at the end of the string with nothing
* but delimiters found, then return NULL.
*/
if (!*pbegin)
{
return NULL;
}
/* Does the token begin with '#' -- comment */
else if (*pbegin == '#')
{
/* Return NULL meaning that we are at the end of the line */
*saveptr = pbegin;
pbegin = NULL;
}
else
{
/* Otherwise, we are going to have to parse to find the end of
* the token. Does the token begin with '"'?
*/
if (*pbegin == '"')
{
/* Yes.. then only another '"' can terminate the string */
pbegin++;
term = "\"";
}
else
{
/* No, then any of the usual terminators will terminate the argument */
term = g_delim;
}
/* Find the end of the string */
for (pend = pbegin + 1;
*pend && strchr(term, *pend) == NULL;
pend++);
/* pend either points to the end of the string or to
* the first delimiter after the string.
*/
if (*pend)
{
/* Turn the delimiter into a null terminator */
*pend++ = '\0';
}
/* Save the pointer where we left off */
*saveptr = pend;
}
/* Return the beginning of the token. */
return pbegin;
}
/****************************************************************************
* Name: ftpc_execute
****************************************************************************/
static int ftpc_execute(SESSION handle, int argc, char *argv[])
{
const struct cmdmap_s *cmdmap;
const char *cmd;
cmd_t handler = cmd_lunrecognized;
int ret;
/* The form of argv is:
*
* argv[0]: The command name. This is argv[0] when the arguments
* are, finally, received by the command handler
* argv[1]: The beginning of argument (up to FTPC_MAX_ARGUMENTS)
* argv[argc]: NULL terminating pointer
*/
cmd = argv[0];
/* See if the command is one that we understand */
for (cmdmap = g_cmdmap; cmdmap->cmd; cmdmap++)
{
if (strcmp(cmdmap->cmd, cmd) == 0)
{
/* Check if a valid number of arguments was provided. We
* do this simple, imperfect checking here so that it does
* not have to be performed in each command.
*/
if (argc < cmdmap->minargs)
{
/* Fewer than the minimum number were provided */
printf("Too few arguments for '%s'\n", cmd);
return ERROR;
}
else if (argc > cmdmap->maxargs)
{
/* More than the maximum number were provided */
printf("Too many arguments for '%s'\n", cmd);
return ERROR;
}
else
{
/* A valid number of arguments were provided (this does
* not mean they are right).
*/
handler = cmdmap->handler;
break;
}
}
}
ret = handler(handle, argc, argv);
if (ret < 0)
{
printf("%s failed: %d\n", cmd, errno);
}
return ret;
}
/****************************************************************************
* Name: ftpc_parse
****************************************************************************/
int ftpc_parse(SESSION handle, char *cmdline)
{
FAR char *argv[FTPC_MAX_ARGUMENTS+1];
FAR char *saveptr;
FAR char *cmd;
int argc;
int ret;
/* Initialize parser state */
memset(argv, 0, FTPC_MAX_ARGUMENTS*sizeof(FAR char *));
/* Parse out the command at the beginning of the line */
saveptr = cmdline;
cmd = ftpc_argument(&saveptr);
/* Check if any command was provided -OR- if command processing is
* currently disabled.
*/
if (!cmd)
{
/* An empty line is not an error */
return OK;
}
/* Parse all of the arguments following the command name. */
argv[0] = cmd;
for (argc = 1; argc < FTPC_MAX_ARGUMENTS; argc++)
{
argv[argc] = ftpc_argument(&saveptr);
if (!argv[argc])
{
break;
}
}
argv[argc] = NULL;
/* Check if the maximum number of arguments was exceeded */
if (argc > FTPC_MAX_ARGUMENTS)
{
printf("Too many arguments\n");
ret = -EINVAL;
}
else
{
/* Then execute the command */
ret = ftpc_execute(handle, argc, argv);
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
int ftpc_main(int argc, char **argv, char **envp)
{
struct ftpc_connect_s connect = {{0}, 0};
SESSION handle;
FAR char *ptr;
#ifndef CONFIG_EXAMPLES_FTPC_FGETS
int ret;
#endif
if (argc != 2)
{
printf("Usage:\n");
printf(" %s xx.xx.xx.xx[:pp]\n", argv[0]);
printf("Where\n");
printf(" xx.xx.xx.xx is the IP address of the FTP server\n");
printf(" pp is option port to use with the FTP server\n");
exit(1);
}
/* Check if the argument includes a port number */
ptr = strchr(argv[1], ':');
if (ptr)
{
*ptr = '\0';
connect.port = atoi(ptr+1);
}
/* In any event, we can now extract the IP address from the comman-line */
connect.addr.s_addr = inet_addr(argv[1]);
/* Connect to the FTP server */
handle = ftpc_connect(&connect);
if (!handle)
{
printf("Failed to connect to the server: %d\n", errno);
exit(1);
}
/* Present a greeting */
printf("NuttX FTP Client:\n");
FFLUSH();
/* Setting optind to -1 is a non-standard, backdoor way to reinitialize
* getopt(). getopt() is not thread safe and we have no idea what state
* it is in now!
*/
optind = -1;
/* Then enter the command line parsing loop */
for (;;)
{
/* Display the prompt string */
fputs("nfc> ", stdout);
FFLUSH();
/* Get the next line of input */
#ifdef CONFIG_EXAMPLES_FTPC_FGETS
/* fgets returns NULL on end-of-file or any I/O error */
if (fgets(g_line, CONFIG_FTPC_LINELEN, stdin) == NULL)
{
printf("ERROR: fgets failed: %d\n", errno);
return 1;
}
#else
ret = readline(g_line, CONFIG_FTPC_LINELEN, stdin, stdout);
/* Readline normally returns the number of characters read,
* but will return 0 on end of file or a negative value
* if an error occurs. Either will cause the session to
* terminate.
*/
if (ret <= 0)
{
printf("ERROR: readline failed: %d\n", ret);
return 1;
}
#endif
else
{
/* Parse and process the command */
(void)ftpc_parse(handle, g_line);
FFLUSH();
}
}
return 0;
}