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nuttx-apps/nshlib/nsh_telnetd.c

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/****************************************************************************
* apps/nshlib/nsh_telnetd.c
*
* Copyright (C) 2007-2013 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 Gregory Nutt 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 <stdio.h>
#include <unistd.h>
#include <assert.h>
#include <debug.h>
#include <string.h>
#include <arpa/inet.h>
#include <apps/netutils/telnetd.h>
#include "nsh.h"
#include "nsh_console.h"
#ifdef CONFIG_NSH_TELNET
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifdef CONFIG_NSH_TELNET_LOGIN
# define TELNET_IAC 255
# define TELNET_WILL 251
# define TELNET_WONT 252
# define TELNET_DO 253
# define TELNET_DONT 254
# define TELNET_USE_ECHO 1
# define TELNET_NOTUSE_ECHO 0
#endif /* CONFIG_NSH_TELNET_LOGIN */
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_telnetecho
****************************************************************************/
#ifdef CONFIG_NSH_TELNET_LOGIN
void nsh_telnetecho(struct console_stdio_s *pstate, uint8_t is_use)
{
uint8_t optbuf[4];
optbuf[0] = TELNET_IAC;
optbuf[1] = (is_use == TELNET_USE_ECHO) ? TELNET_WILL : TELNET_DO;
optbuf[2] = 1;
optbuf[3] = 0;
fputs((char *)optbuf, pstate->cn_outstream);
fflush(pstate->cn_outstream);
}
#endif
/****************************************************************************
* Name: nsh_telnetlogin
****************************************************************************/
#ifdef CONFIG_NSH_TELNET_LOGIN
int nsh_telnetlogin(struct console_stdio_s *pstate)
{
char username[16];
char password[16];
uint8_t i;
/* Present the NSH Telnet greeting */
fputs(g_telnetgreeting, pstate->cn_outstream);
fflush(pstate->cn_outstream);
/* Loop for the configured number of retries */
for (i = 0; i < CONFIG_NSH_TELNET_FAILCOUNT; i++)
{
/* Ask for the login username */
fputs(g_userprompt, pstate->cn_outstream);
fflush(pstate->cn_outstream);
if (fgets(pstate->cn_line, CONFIG_NSH_LINELEN, INSTREAM(pstate)) != NULL)
{
strncpy(username, pstate->cn_line, sizeof(username));
username[sizeof(username) - 1] = 0;
}
/* Ask for the login password */
fputs(g_passwordprompt, pstate->cn_outstream);
fflush(pstate->cn_outstream);
nsh_telnetecho(pstate, TELNET_NOTUSE_ECHO);
if (fgets(pstate->cn_line, CONFIG_NSH_LINELEN, INSTREAM(pstate)) != NULL)
{
/* Verify the username and password */
strncpy(password, pstate->cn_line, sizeof(password));
password[sizeof(password) - 1] = 0;
if (strcmp(password, CONFIG_NSH_TELNET_PASSWORD) == 0 &&
strcmp(username, CONFIG_NSH_TELNET_USERNAME) == 0)
{
fputs(g_loginsuccess, pstate->cn_outstream);
fflush(pstate->cn_outstream);
nsh_telnetecho(pstate, TELNET_USE_ECHO);
return OK;
}
else
{
fputs(g_badcredentials, pstate->cn_outstream);
fflush(pstate->cn_outstream);
}
}
nsh_telnetecho(pstate, TELNET_USE_ECHO);
}
/* Too many failed login attempts */
fputs(g_loginfailure, pstate->cn_outstream);
fflush(pstate->cn_outstream);
return -1;
}
#endif /* CONFIG_NSH_TELNET_LOGIN */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_telnetmain
****************************************************************************/
int nsh_telnetmain(int argc, char *argv[])
{
FAR struct console_stdio_s *pstate = nsh_newconsole();
DEBUGASSERT(pstate != NULL);
dbg("Session [%d] Started\n", getpid());
/* Login User and Password Check */
#ifdef CONFIG_NSH_TELNET_LOGIN
if (nsh_telnetlogin(pstate) != OK)
{
nsh_exit(&pstate->cn_vtbl, 1);
return -1; /* nsh_exit does not return */
}
#endif /* CONFIG_NSH_TELNET_LOGIN */
/* The following logic mostly the same as the login in nsh_session.c. It
* differs only in that gets() is called to get the command instead of
* readline().
*/
/* Present the NSH greeting */
fputs(g_nshgreeting, pstate->cn_outstream);
fflush(pstate->cn_outstream);
/* Execute the startup script. If standard console is also defined, then
* we will not bother with the initscript here (although it is safe to
* call nshinitscript multiple times).
*/
#if defined(CONFIG_NSH_ROMFSETC) && !defined(CONFIG_NSH_CONSOLE)
(void)nsh_initscript(&pstate->cn_vtbl);
#endif
/* Execute the login script */
#ifdef CONFIG_NSH_ROMFSRC
(void)nsh_loginscript(&pstate->cn_vtbl);
#endif
/* Then enter the command line parsing loop */
for (;;)
{
/* Display the prompt string */
fputs(g_nshprompt, pstate->cn_outstream);
fflush(pstate->cn_outstream);
/* Get the next line of input from the Telnet client */
if (fgets(pstate->cn_line, CONFIG_NSH_LINELEN, INSTREAM(pstate)) != NULL)
{
/* Parse process the received Telnet command */
(void)nsh_parse(&pstate->cn_vtbl, pstate->cn_line);
fflush(pstate->cn_outstream);
}
else
{
fprintf(pstate->cn_outstream, g_fmtcmdfailed, "nsh_telnetmain",
"fgets", NSH_ERRNO);
nsh_exit(&pstate->cn_vtbl, 1);
}
}
/* Clean up */
nsh_exit(&pstate->cn_vtbl, 0);
/* We do not get here, but this is necessary to keep some compilers happy */
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_telnetstart
*
* Description:
* nsh_telnetstart() starts the Telnet daemon that will allow multiple
* NSH connections via Telnet. This function returns immediately after
* the daemon has been started.
*
* Input Parameters:
* None. All of the properties of the Telnet daemon are controlled by
* NuttX configuration setting.
*
* Returned Values:
* The task ID of the Telnet daemon was successfully started. A negated
* errno value will be returned on failure.
*
****************************************************************************/
int nsh_telnetstart(void)
{
struct telnetd_config_s config;
int ret;
/* Initialize any USB tracing options that were requested. If standard
* console is also defined, then we will defer this step to the standard
* console.
*/
#if defined(CONFIG_NSH_USBDEV_TRACE) && !defined(CONFIG_NSH_CONSOLE)
usbtrace_enable(TRACE_BITSET);
#endif
/* Configure the telnet daemon */
config.d_port = HTONS(CONFIG_NSH_TELNETD_PORT);
config.d_priority = CONFIG_NSH_TELNETD_DAEMONPRIO;
config.d_stacksize = CONFIG_NSH_TELNETD_DAEMONSTACKSIZE;
config.t_priority = CONFIG_NSH_TELNETD_CLIENTPRIO;
config.t_stacksize = CONFIG_NSH_TELNETD_CLIENTSTACKSIZE;
config.t_entry = nsh_telnetmain;
/* Start the telnet daemon */
vdbg("Starting the Telnet daemon\n");
ret = telnetd_start(&config);
if (ret < 0)
{
dbg("Failed to tart the Telnet daemon: %d\n", ret);
}
return ret;
}
#endif /* CONFIG_NSH_TELNET */
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