2015-12-07 16:26:57 +01:00
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/****************************************************************************
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2015-12-07 20:48:06 +01:00
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* drivers/net/telnet.c
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2015-12-07 16:26:57 +01:00
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*
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2020-08-04 18:55:59 +02:00
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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2015-12-07 16:26:57 +01:00
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*
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2020-08-04 18:55:59 +02:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2015-12-07 16:26:57 +01:00
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*
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2020-08-04 18:55:59 +02:00
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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2015-12-07 16:26:57 +01:00
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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2020-02-05 10:52:26 +01:00
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#include <assert.h>
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2015-12-07 16:26:57 +01:00
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#include <stdio.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <errno.h>
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#include <debug.h>
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2020-02-05 10:52:26 +01:00
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#include <nuttx/kmalloc.h>
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2019-05-21 17:57:46 +02:00
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#include <nuttx/kthread.h>
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2020-02-05 10:52:26 +01:00
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#include <nuttx/signal.h>
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2019-05-21 17:57:46 +02:00
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#include <nuttx/semaphore.h>
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2015-12-07 16:26:57 +01:00
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#include <nuttx/fs/fs.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/telnet.h>
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2015-12-07 20:48:06 +01:00
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#ifdef CONFIG_NETDEV_TELNET
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2015-12-07 16:26:57 +01:00
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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2019-01-05 19:14:05 +01:00
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2015-12-07 16:26:57 +01:00
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/* Configuration ************************************************************/
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#ifndef CONFIG_TELNET_RXBUFFER_SIZE
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# define CONFIG_TELNET_RXBUFFER_SIZE 256
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#endif
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#ifndef CONFIG_TELNET_TXBUFFER_SIZE
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# define CONFIG_TELNET_TXBUFFER_SIZE 256
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#endif
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2019-05-21 17:57:46 +02:00
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#ifndef CONFIG_TELNET_MAXLCLIENTS
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# define CONFIG_TELNET_MAXLCLIENTS 8
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#endif
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#undef HAVE_SIGNALS
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2020-10-29 05:53:41 +01:00
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#if defined(CONFIG_TTY_SIGINT) || defined(CONFIG_TTY_SIGTSTP)
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2019-05-21 17:57:46 +02:00
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# define HAVE_SIGNALS
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#endif
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2015-12-07 16:26:57 +01:00
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/* Telnet protocol stuff ****************************************************/
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2020-02-05 10:52:26 +01:00
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#define TELNET_NL 0x0a
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#define TELNET_CR 0x0d
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2019-01-05 19:14:05 +01:00
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/* Telnet commands */
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#define TELNET_ECHO 1
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#define TELNET_SGA 3 /* Suppress Go Ahead */
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#define TELNET_NAWS 31 /* Negotiate about window size */
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/* Telnet control */
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2015-12-07 16:26:57 +01:00
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2019-01-05 19:14:05 +01:00
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#define TELNET_IAC 255
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#define TELNET_WILL 251
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#define TELNET_WONT 252
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#define TELNET_DO 253
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#define TELNET_DONT 254
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#define TELNET_SB 250
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#define TELNET_SE 240
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2018-01-09 12:16:02 +01:00
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2015-12-07 16:26:57 +01:00
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/* Device stuff *************************************************************/
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2020-02-05 10:52:26 +01:00
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#define TELNET_DEVFMT "/dev/telnet%d"
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2015-12-07 16:26:57 +01:00
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/****************************************************************************
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* Private Types
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****************************************************************************/
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2019-01-05 19:14:05 +01:00
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2015-12-07 16:26:57 +01:00
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/* The state of the telnet parser */
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enum telnet_state_e
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{
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STATE_NORMAL = 0,
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STATE_IAC,
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STATE_WILL,
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STATE_WONT,
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STATE_DO,
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2019-01-05 19:14:05 +01:00
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STATE_DONT,
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STATE_SB,
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STATE_SB_NAWS,
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STATE_SE
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2015-12-07 16:26:57 +01:00
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};
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/* This structure describes the internal state of the driver */
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struct telnet_dev_s
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{
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2019-01-05 19:14:05 +01:00
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uint8_t td_state; /* (See telnet_state_e) */
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uint8_t td_crefs; /* The number of open references to the session */
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2020-02-05 10:57:58 +01:00
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uint8_t td_minor; /* Minor device number */
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2020-08-19 10:46:05 +02:00
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uint16_t td_offset; /* Offset to the valid, pending bytes in the rxbuffer */
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2020-04-12 17:52:56 +02:00
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uint16_t td_pending; /* Number of valid, pending bytes in the rxbuffer */
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2019-01-05 19:14:05 +01:00
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#ifdef CONFIG_TELNET_SUPPORT_NAWS
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uint16_t td_rows; /* Number of NAWS rows */
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uint16_t td_cols; /* Number of NAWS cols */
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int td_sb_count; /* Count of TELNET_SB bytes received */
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#endif
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2019-05-21 17:57:46 +02:00
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#ifdef HAVE_SIGNALS
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2020-02-05 10:52:26 +01:00
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pid_t td_pid;
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2019-05-21 17:57:46 +02:00
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#endif
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2019-01-05 19:14:05 +01:00
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FAR struct socket td_psock; /* A clone of the internal socket structure */
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2015-12-07 16:26:57 +01:00
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char td_rxbuffer[CONFIG_TELNET_RXBUFFER_SIZE];
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char td_txbuffer[CONFIG_TELNET_TXBUFFER_SIZE];
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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2019-01-05 19:14:05 +01:00
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2015-12-07 16:26:57 +01:00
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/* Support functions */
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#ifdef CONFIG_TELNET_DUMPBUFFER
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static inline void telnet_dumpbuffer(FAR const char *msg,
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FAR const char *buffer, unsigned int nbytes);
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#else
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# define telnet_dumpbuffer(msg,buffer,nbytes)
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#endif
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static void telnet_getchar(FAR struct telnet_dev_s *priv, uint8_t ch,
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FAR char *dest, int *nread);
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static ssize_t telnet_receive(FAR struct telnet_dev_s *priv,
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FAR const char *src, size_t srclen, FAR char *dest,
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size_t destlen);
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static bool telnet_putchar(FAR struct telnet_dev_s *priv, uint8_t ch,
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int *nwritten);
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static void telnet_sendopt(FAR struct telnet_dev_s *priv, uint8_t option,
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uint8_t value);
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2015-12-07 20:48:06 +01:00
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/* Telnet character driver methods */
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2015-12-07 16:26:57 +01:00
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static int telnet_open(FAR struct file *filep);
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static int telnet_close(FAR struct file *filep);
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2019-01-05 19:14:05 +01:00
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static ssize_t telnet_read(FAR struct file *filep, FAR char *buffer,
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size_t len);
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static ssize_t telnet_write(FAR struct file *filep, FAR const char *buffer,
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size_t len);
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2020-02-05 09:12:53 +01:00
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static int telnet_ioctl(FAR struct file *filep, int cmd,
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unsigned long arg);
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2019-01-05 19:14:05 +01:00
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static int telnet_poll(FAR struct file *filep, FAR struct pollfd *fds,
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bool setup);
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2015-12-07 20:48:06 +01:00
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/* Telnet session creation */
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static int telnet_session(FAR struct telnet_session_s *session);
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/* Telnet factory driver methods */
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static ssize_t factory_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static ssize_t factory_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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2020-02-05 09:12:53 +01:00
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static int factory_ioctl(FAR struct file *filep, int cmd,
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2015-12-07 16:26:57 +01:00
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unsigned long arg);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_telnet_fops =
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{
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2015-12-07 20:48:06 +01:00
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telnet_open, /* open */
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telnet_close, /* close */
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telnet_read, /* read */
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telnet_write, /* write */
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2019-01-13 21:04:20 +01:00
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NULL, /* seek */
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2020-02-05 09:12:53 +01:00
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telnet_ioctl, /* ioctl */
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2019-05-22 02:57:54 +02:00
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telnet_poll /* poll */
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2019-01-13 21:04:20 +01:00
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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, NULL /* unlink */
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#endif
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2015-12-07 20:48:06 +01:00
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};
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static const struct file_operations g_factory_fops =
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{
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2019-01-13 21:04:20 +01:00
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NULL, /* open */
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NULL, /* close */
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2015-12-07 20:48:06 +01:00
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factory_read, /* read */
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factory_write, /* write */
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2019-01-13 21:04:20 +01:00
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NULL, /* seek */
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2020-02-05 09:12:53 +01:00
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factory_ioctl, /* ioctl */
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NULL /* poll */
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2019-01-13 21:04:20 +01:00
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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, NULL /* unlink */
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#endif
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2015-12-07 16:26:57 +01:00
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};
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2019-05-21 17:57:46 +02:00
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/* This is an global data set of all of all active Telnet drivers. This
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* additional logic in included to handle killing of task via control
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* characters received via Telenet (via Ctrl-C SIGINT, in particular).
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*/
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static struct telnet_dev_s *g_telnet_clients[CONFIG_TELNET_MAXLCLIENTS];
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static sem_t g_clients_sem = SEM_INITIALIZER(1);
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2015-12-07 16:26:57 +01:00
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: telnet_dumpbuffer
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*
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* Description:
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* Dump a buffer of data (debug only)
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*
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****************************************************************************/
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#ifdef CONFIG_TELNET_DUMPBUFFER
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static inline void telnet_dumpbuffer(FAR const char *msg,
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FAR const char *buffer,
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unsigned int nbytes)
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{
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2020-02-07 14:16:21 +01:00
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/* CONFIG_DEBUG_FEATURES, CONFIG_DEBUG_INFO, and CONFIG_DEBUG_NET have to
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* be defined or the following does nothing.
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2019-01-05 19:14:05 +01:00
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*/
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2015-12-07 16:26:57 +01:00
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2019-01-05 19:14:05 +01:00
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ninfodumpbuffer(msg, (FAR const uint8_t *)buffer, nbytes);
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2015-12-07 16:26:57 +01:00
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}
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#endif
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2019-05-21 17:57:46 +02:00
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/****************************************************************************
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2020-02-05 10:14:30 +01:00
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* Name: telnet_check_ctrlchar
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2019-05-21 17:57:46 +02:00
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*
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* Description:
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* Check if an incoming control character should generate a signal.
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*
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****************************************************************************/
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#ifdef HAVE_SIGNALS
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2020-02-05 10:14:30 +01:00
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static void telnet_check_ctrlchar(FAR struct telnet_dev_s *priv,
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FAR char *buffer, size_t len)
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2019-05-21 17:57:46 +02:00
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{
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int signo = 0;
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2020-02-05 10:52:26 +01:00
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for (; priv->td_pid >= 0 && len > 0; buffer++, len--)
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2020-02-05 10:14:30 +01:00
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{
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2019-05-21 17:57:46 +02:00
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#ifdef CONFIG_TTY_SIGINT
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2020-04-12 18:09:04 +02:00
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/* Is this the special character that will generate the SIGINT
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* signal?
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*/
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2019-05-21 17:57:46 +02:00
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2020-02-05 10:14:30 +01:00
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if (*buffer == CONFIG_TTY_SIGINT_CHAR)
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{
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/* Yes.. note that the kill is needed and do not put the character
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* into the Rx buffer. It should not be read as normal data.
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*/
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2019-05-21 17:57:46 +02:00
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2020-02-05 10:14:30 +01:00
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signo = SIGINT;
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break;
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}
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2019-05-21 17:57:46 +02:00
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#endif
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2020-02-10 15:49:00 +01:00
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2020-10-29 05:53:41 +01:00
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#ifdef CONFIG_TTY_SIGTSTP
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/* Is this the special character that will generate the SIGTSTP
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2020-04-12 18:09:04 +02:00
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* signal?
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*/
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2019-05-21 17:57:46 +02:00
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2020-10-29 05:53:41 +01:00
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if (*buffer == CONFIG_TTY_SIGTSTP_CHAR)
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2019-05-21 17:57:46 +02:00
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{
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/* Note that the kill is needed and do not put the character
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* into the Rx buffer. It should not be read as normal data.
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*/
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2020-10-29 05:53:41 +01:00
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signo = SIGTSTP;
|
2020-02-10 16:05:17 +01:00
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#ifndef CONFIG_TTY_SIGINT
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break;
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#endif
|
2019-05-21 17:57:46 +02:00
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}
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#endif
|
2020-02-05 10:14:30 +01:00
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}
|
2019-05-21 17:57:46 +02:00
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/* Send the signal if necessary */
|
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|
if (signo != 0)
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|
{
|
2020-02-05 10:52:26 +01:00
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nxsig_kill(priv->td_pid, signo);
|
2019-05-21 17:57:46 +02:00
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}
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}
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|
#endif
|
|
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|
|
2015-12-07 16:26:57 +01:00
|
|
|
/****************************************************************************
|
|
|
|
* Name: telnet_getchar
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Get another character for the user received buffer from the RX buffer
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
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|
|
static void telnet_getchar(FAR struct telnet_dev_s *priv, uint8_t ch,
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|
|
FAR char *dest, int *nread)
|
|
|
|
{
|
|
|
|
register int index;
|
|
|
|
|
2018-01-09 12:16:02 +01:00
|
|
|
#ifndef CONFIG_TELNET_CHARACTER_MODE
|
2015-12-07 16:26:57 +01:00
|
|
|
/* Ignore carriage returns */
|
|
|
|
|
2020-02-05 10:52:26 +01:00
|
|
|
if (ch != TELNET_CR)
|
2018-01-09 12:16:02 +01:00
|
|
|
#endif
|
2015-12-07 16:26:57 +01:00
|
|
|
{
|
|
|
|
/* Add all other characters to the destination buffer */
|
|
|
|
|
|
|
|
index = *nread;
|
|
|
|
dest[index++] = ch;
|
|
|
|
*nread = index;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: telnet_receive
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Process a received Telnet buffer
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
2019-01-05 19:14:05 +01:00
|
|
|
static ssize_t telnet_receive(FAR struct telnet_dev_s *priv,
|
|
|
|
FAR const char *src, size_t srclen,
|
|
|
|
FAR char *dest, size_t destlen)
|
2015-12-07 16:26:57 +01:00
|
|
|
{
|
|
|
|
int nread;
|
|
|
|
uint8_t ch;
|
|
|
|
|
2020-11-23 09:47:52 +01:00
|
|
|
ninfo("srclen: %zd destlen: %zd\n", srclen, destlen);
|
2015-12-07 16:26:57 +01:00
|
|
|
|
|
|
|
for (nread = 0; srclen > 0 && nread < destlen; srclen--)
|
|
|
|
{
|
|
|
|
ch = *src++;
|
2016-06-20 19:59:15 +02:00
|
|
|
ninfo("ch=%02x state=%d\n", ch, priv->td_state);
|
2015-12-07 16:26:57 +01:00
|
|
|
|
|
|
|
switch (priv->td_state)
|
|
|
|
{
|
|
|
|
case STATE_IAC:
|
|
|
|
if (ch == TELNET_IAC)
|
|
|
|
{
|
|
|
|
telnet_getchar(priv, ch, dest, &nread);
|
|
|
|
priv->td_state = STATE_NORMAL;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
switch (ch)
|
|
|
|
{
|
|
|
|
case TELNET_WILL:
|
|
|
|
priv->td_state = STATE_WILL;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case TELNET_WONT:
|
|
|
|
priv->td_state = STATE_WONT;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case TELNET_DO:
|
|
|
|
priv->td_state = STATE_DO;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case TELNET_DONT:
|
|
|
|
priv->td_state = STATE_DONT;
|
|
|
|
break;
|
|
|
|
|
2019-01-05 19:14:05 +01:00
|
|
|
#ifdef CONFIG_TELNET_SUPPORT_NAWS
|
|
|
|
case TELNET_SB:
|
|
|
|
priv->td_state = STATE_SB;
|
|
|
|
priv->td_sb_count = 0;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case TELNET_SE:
|
|
|
|
priv->td_state = STATE_NORMAL;
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
2015-12-07 16:26:57 +01:00
|
|
|
default:
|
|
|
|
priv->td_state = STATE_NORMAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case STATE_WILL:
|
2019-01-05 19:14:05 +01:00
|
|
|
#ifdef CONFIG_TELNET_SUPPORT_NAWS
|
|
|
|
/* For NAWS, Reply with a DO */
|
|
|
|
|
|
|
|
if (ch == TELNET_NAWS)
|
|
|
|
{
|
|
|
|
telnet_sendopt(priv, TELNET_DO, ch);
|
|
|
|
}
|
|
|
|
|
2020-02-22 19:31:14 +01:00
|
|
|
/* Reply with a DON'T */
|
2015-12-07 16:26:57 +01:00
|
|
|
|
2019-01-05 19:14:05 +01:00
|
|
|
else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
telnet_sendopt(priv, TELNET_DONT, ch);
|
|
|
|
ninfo("Suppress: 0x%02X (%d)\n", ch, ch);
|
|
|
|
}
|
|
|
|
|
2015-12-07 16:26:57 +01:00
|
|
|
priv->td_state = STATE_NORMAL;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case STATE_WONT:
|
|
|
|
telnet_sendopt(priv, TELNET_DONT, ch);
|
|
|
|
priv->td_state = STATE_NORMAL;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case STATE_DO:
|
2018-01-09 12:16:02 +01:00
|
|
|
#ifdef CONFIG_TELNET_CHARACTER_MODE
|
2020-02-05 16:52:37 +01:00
|
|
|
if (ch == TELNET_SGA || ch == TELNET_ECHO)
|
2018-01-09 12:16:02 +01:00
|
|
|
{
|
2020-04-12 18:09:04 +02:00
|
|
|
/* If it received 'ECHO' or 'Suppress Go Ahead', then do
|
|
|
|
* nothing.
|
|
|
|
*/
|
2018-01-09 12:16:02 +01:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* Reply with a WONT */
|
|
|
|
|
|
|
|
telnet_sendopt(priv, TELNET_WONT, ch);
|
2019-01-05 19:14:05 +01:00
|
|
|
ninfo("WONT: 0x%02X\n", ch);
|
2018-01-09 12:16:02 +01:00
|
|
|
}
|
|
|
|
#else
|
2015-12-07 16:26:57 +01:00
|
|
|
/* Reply with a WONT */
|
|
|
|
|
|
|
|
telnet_sendopt(priv, TELNET_WONT, ch);
|
2018-01-09 12:16:02 +01:00
|
|
|
#endif
|
2015-12-07 16:26:57 +01:00
|
|
|
priv->td_state = STATE_NORMAL;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case STATE_DONT:
|
2019-12-05 21:54:50 +01:00
|
|
|
|
2015-12-07 16:26:57 +01:00
|
|
|
/* Reply with a WONT */
|
|
|
|
|
|
|
|
telnet_sendopt(priv, TELNET_WONT, ch);
|
|
|
|
priv->td_state = STATE_NORMAL;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case STATE_NORMAL:
|
|
|
|
if (ch == TELNET_IAC)
|
|
|
|
{
|
|
|
|
priv->td_state = STATE_IAC;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
telnet_getchar(priv, ch, dest, &nread);
|
|
|
|
}
|
|
|
|
break;
|
2019-01-05 19:14:05 +01:00
|
|
|
|
|
|
|
#ifdef CONFIG_TELNET_SUPPORT_NAWS
|
2019-05-21 17:57:46 +02:00
|
|
|
/* Handle Telnet Sub negotiation request */
|
2019-01-05 19:14:05 +01:00
|
|
|
|
|
|
|
case STATE_SB:
|
|
|
|
switch (ch)
|
|
|
|
{
|
|
|
|
case TELNET_NAWS:
|
|
|
|
priv->td_state = STATE_SB_NAWS;
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
priv->td_state = STATE_NORMAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
/* Handle NAWS sub-option negotiation */
|
|
|
|
|
|
|
|
case STATE_SB_NAWS:
|
2019-12-05 21:54:50 +01:00
|
|
|
|
2019-01-05 19:14:05 +01:00
|
|
|
/* Update cols / rows based on received byte count */
|
|
|
|
|
|
|
|
switch (priv->td_sb_count)
|
|
|
|
{
|
|
|
|
case 0:
|
2019-02-24 18:51:25 +01:00
|
|
|
priv->td_cols = (priv->td_cols & 0x00ff) | (ch << 8);
|
2019-01-05 19:14:05 +01:00
|
|
|
break;
|
|
|
|
|
|
|
|
case 1:
|
2019-02-24 18:51:25 +01:00
|
|
|
priv->td_cols = (priv->td_cols & 0xff00) | ch;
|
2019-01-05 19:14:05 +01:00
|
|
|
break;
|
|
|
|
|
|
|
|
case 2:
|
2019-02-24 18:51:25 +01:00
|
|
|
priv->td_rows = (priv->td_rows & 0x00ff) | (ch << 8);
|
2019-01-05 19:14:05 +01:00
|
|
|
break;
|
|
|
|
|
|
|
|
case 3:
|
2019-02-24 18:51:25 +01:00
|
|
|
priv->td_rows = (priv->td_rows & 0xff00) | ch;
|
2019-01-05 19:14:05 +01:00
|
|
|
ninfo("NAWS: %d,%d", priv->td_cols, priv->td_rows);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Increment SB count and switch to NORMAL when complete */
|
|
|
|
|
|
|
|
if (++priv->td_sb_count == 4)
|
|
|
|
{
|
|
|
|
priv->td_state = STATE_NORMAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
break;
|
|
|
|
#endif
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* We get here if (1) all of the received bytes have been processed, or
|
|
|
|
* (2) if the user's buffer has become full.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (srclen > 0)
|
|
|
|
{
|
|
|
|
/* Remember where we left off. These bytes will be returned the next
|
|
|
|
* time that telnet_read() is called.
|
|
|
|
*/
|
|
|
|
|
|
|
|
priv->td_pending = srclen;
|
|
|
|
priv->td_offset = (src - priv->td_rxbuffer);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* All of the received bytes were consumed */
|
|
|
|
|
|
|
|
priv->td_pending = 0;
|
|
|
|
priv->td_offset = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return nread;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: telnet_putchar
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Put another character from the user buffer to the TX buffer.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static bool telnet_putchar(FAR struct telnet_dev_s *priv, uint8_t ch,
|
|
|
|
int *nread)
|
|
|
|
{
|
|
|
|
register int index;
|
|
|
|
bool ret = false;
|
|
|
|
|
2020-04-12 18:09:04 +02:00
|
|
|
/* Ignore carriage returns (we will put these in automatically as
|
|
|
|
* necessary).
|
|
|
|
*/
|
2015-12-07 16:26:57 +01:00
|
|
|
|
2020-02-05 10:52:26 +01:00
|
|
|
if (ch != TELNET_CR)
|
2015-12-07 16:26:57 +01:00
|
|
|
{
|
|
|
|
/* Add all other characters to the destination buffer */
|
|
|
|
|
|
|
|
index = *nread;
|
|
|
|
priv->td_txbuffer[index++] = ch;
|
|
|
|
|
|
|
|
/* Check for line feeds */
|
|
|
|
|
2020-02-05 10:52:26 +01:00
|
|
|
if (ch == TELNET_NL)
|
2015-12-07 16:26:57 +01:00
|
|
|
{
|
|
|
|
/* Now add the carriage return */
|
|
|
|
|
2020-02-05 10:52:26 +01:00
|
|
|
priv->td_txbuffer[index++] = TELNET_CR;
|
2015-12-07 16:26:57 +01:00
|
|
|
|
|
|
|
/* End of line */
|
|
|
|
|
|
|
|
ret = true;
|
|
|
|
}
|
|
|
|
|
|
|
|
*nread = index;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: telnet_sendopt
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Send the telnet option bytes
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static void telnet_sendopt(FAR struct telnet_dev_s *priv, uint8_t option,
|
|
|
|
uint8_t value)
|
|
|
|
{
|
2020-02-05 09:24:54 +01:00
|
|
|
uint8_t optbuf[3];
|
2017-09-30 01:48:15 +02:00
|
|
|
int ret;
|
|
|
|
|
2015-12-07 16:26:57 +01:00
|
|
|
optbuf[0] = TELNET_IAC;
|
|
|
|
optbuf[1] = option;
|
|
|
|
optbuf[2] = value;
|
|
|
|
|
2020-02-05 09:24:54 +01:00
|
|
|
telnet_dumpbuffer("Send optbuf", optbuf, 3);
|
2017-09-30 01:48:15 +02:00
|
|
|
|
2020-02-05 09:24:54 +01:00
|
|
|
ret = psock_send(&priv->td_psock, optbuf, 3, 0);
|
2017-09-30 01:48:15 +02:00
|
|
|
if (ret < 0)
|
2015-12-07 16:26:57 +01:00
|
|
|
{
|
2017-09-30 01:48:15 +02:00
|
|
|
nerr("ERROR: Failed to send TELNET_IAC: %d\n", ret);
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: telnet_open
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int telnet_open(FAR struct file *filep)
|
|
|
|
{
|
|
|
|
FAR struct inode *inode = filep->f_inode;
|
|
|
|
FAR struct telnet_dev_s *priv = inode->i_private;
|
|
|
|
int tmp;
|
|
|
|
int ret;
|
|
|
|
|
2016-06-20 19:59:15 +02:00
|
|
|
ninfo("td_crefs: %d\n", priv->td_crefs);
|
2015-12-07 16:26:57 +01:00
|
|
|
|
|
|
|
/* Get exclusive access to the device structures */
|
|
|
|
|
2022-09-28 18:29:04 +02:00
|
|
|
ret = nxsem_wait(&g_clients_sem);
|
2015-12-07 16:26:57 +01:00
|
|
|
if (ret < 0)
|
|
|
|
{
|
2017-10-04 23:22:27 +02:00
|
|
|
nerr("ERROR: nxsem_wait failed: %d\n", ret);
|
2015-12-07 16:26:57 +01:00
|
|
|
goto errout;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Increment the count of references to the device. If this the first
|
|
|
|
* time that the driver has been opened for this device, then initialize
|
|
|
|
* the device.
|
|
|
|
*/
|
|
|
|
|
|
|
|
tmp = priv->td_crefs + 1;
|
|
|
|
if (tmp > 255)
|
|
|
|
{
|
|
|
|
/* More than 255 opens; uint8_t would overflow to zero */
|
|
|
|
|
|
|
|
ret = -EMFILE;
|
|
|
|
goto errout_with_sem;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Save the new open count on success */
|
|
|
|
|
|
|
|
priv->td_crefs = tmp;
|
|
|
|
ret = OK;
|
|
|
|
|
|
|
|
errout_with_sem:
|
2022-09-28 18:29:04 +02:00
|
|
|
nxsem_post(&g_clients_sem);
|
2015-12-07 16:26:57 +01:00
|
|
|
|
|
|
|
errout:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: telnet_close
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int telnet_close(FAR struct file *filep)
|
|
|
|
{
|
|
|
|
FAR struct inode *inode = filep->f_inode;
|
|
|
|
FAR struct telnet_dev_s *priv = inode->i_private;
|
|
|
|
FAR char *devpath;
|
|
|
|
int ret;
|
2019-05-21 17:57:46 +02:00
|
|
|
int i;
|
2015-12-07 16:26:57 +01:00
|
|
|
|
2016-06-20 19:59:15 +02:00
|
|
|
ninfo("td_crefs: %d\n", priv->td_crefs);
|
2015-12-07 16:26:57 +01:00
|
|
|
|
|
|
|
/* Get exclusive access to the device structures */
|
|
|
|
|
2022-09-28 18:29:04 +02:00
|
|
|
ret = nxsem_wait(&g_clients_sem);
|
2015-12-07 16:26:57 +01:00
|
|
|
if (ret < 0)
|
|
|
|
{
|
2017-10-04 23:22:27 +02:00
|
|
|
nerr("ERROR: nxsem_wait failed: %d\n", ret);
|
2022-09-28 18:29:04 +02:00
|
|
|
return ret;
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Decrement the references to the driver. If the reference count will
|
|
|
|
* decrement to 0, then uninitialize the driver.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (priv->td_crefs > 1)
|
|
|
|
{
|
|
|
|
/* Just decrement the reference count and release the semaphore */
|
|
|
|
|
|
|
|
priv->td_crefs--;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* Re-create the path to the driver. */
|
|
|
|
|
2020-02-05 10:52:26 +01:00
|
|
|
ret = asprintf(&devpath, TELNET_DEVFMT, priv->td_minor);
|
2015-12-07 16:26:57 +01:00
|
|
|
if (ret < 0)
|
|
|
|
{
|
2016-06-20 20:44:38 +02:00
|
|
|
nerr("ERROR: Failed to allocate the driver path\n");
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* Un-register the character driver */
|
|
|
|
|
|
|
|
ret = unregister_driver(devpath);
|
|
|
|
if (ret < 0)
|
|
|
|
{
|
|
|
|
/* NOTE: a return value of -EBUSY is not an error, it simply
|
|
|
|
* means that the Telnet driver is busy now and cannot be
|
|
|
|
* registered now because there are other sessions using the
|
|
|
|
* connection. The driver will be properly unregistered when
|
|
|
|
* the final session terminates.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (ret != -EBUSY)
|
|
|
|
{
|
2016-06-20 20:44:38 +02:00
|
|
|
nerr("ERROR: Failed to unregister the driver %s: %d\n",
|
|
|
|
devpath, ret);
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
2020-02-05 10:52:26 +01:00
|
|
|
else
|
|
|
|
{
|
|
|
|
ret = OK;
|
|
|
|
}
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
|
2020-02-05 10:52:26 +01:00
|
|
|
kmm_free(devpath);
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
|
2019-05-21 17:57:46 +02:00
|
|
|
for (i = 0; i < CONFIG_TELNET_MAXLCLIENTS; i++)
|
|
|
|
{
|
|
|
|
if (g_telnet_clients[i] == priv)
|
|
|
|
{
|
2020-02-05 10:52:26 +01:00
|
|
|
g_telnet_clients[i] = NULL;
|
2019-05-21 17:57:46 +02:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-12-07 16:26:57 +01:00
|
|
|
/* Close the socket */
|
|
|
|
|
|
|
|
psock_close(&priv->td_psock);
|
2020-02-05 10:52:26 +01:00
|
|
|
kmm_free(priv);
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
|
2022-09-28 18:29:04 +02:00
|
|
|
nxsem_post(&g_clients_sem);
|
2015-12-07 16:26:57 +01:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: telnet_read
|
|
|
|
****************************************************************************/
|
|
|
|
|
2019-01-05 19:14:05 +01:00
|
|
|
static ssize_t telnet_read(FAR struct file *filep, FAR char *buffer,
|
|
|
|
size_t len)
|
2015-12-07 16:26:57 +01:00
|
|
|
{
|
|
|
|
FAR struct inode *inode = filep->f_inode;
|
|
|
|
FAR struct telnet_dev_s *priv = inode->i_private;
|
2020-03-31 16:05:48 +02:00
|
|
|
ssize_t nread = 0;
|
2015-12-07 16:26:57 +01:00
|
|
|
|
2020-11-23 09:47:52 +01:00
|
|
|
ninfo("len: %zd\n", len);
|
2015-12-07 16:26:57 +01:00
|
|
|
|
|
|
|
/* First, handle the case where there are still valid bytes left in the
|
|
|
|
* I/O buffer from the last time that read was called. NOTE: Much of
|
|
|
|
* what we read may be protocol stuff and may not correspond to user
|
2019-05-22 15:46:40 +02:00
|
|
|
* data. Hence we need the loop and we need may need to wait for data
|
2015-12-07 16:26:57 +01:00
|
|
|
* multiple times in order to get data that the client is interested in.
|
|
|
|
*/
|
|
|
|
|
|
|
|
do
|
|
|
|
{
|
2019-06-03 16:20:21 +02:00
|
|
|
FAR const char *src;
|
|
|
|
|
2019-05-22 15:46:40 +02:00
|
|
|
if (priv->td_pending == 0)
|
2015-12-07 16:26:57 +01:00
|
|
|
{
|
2022-09-28 18:29:04 +02:00
|
|
|
nread = psock_recv(&priv->td_psock,
|
|
|
|
priv->td_rxbuffer,
|
|
|
|
CONFIG_TELNET_RXBUFFER_SIZE,
|
|
|
|
0);
|
|
|
|
if (nread <= 0)
|
2020-03-31 16:05:48 +02:00
|
|
|
{
|
2022-09-28 18:29:04 +02:00
|
|
|
return nread;
|
2020-03-31 16:05:48 +02:00
|
|
|
}
|
2015-12-07 16:26:57 +01:00
|
|
|
|
2022-09-28 18:29:04 +02:00
|
|
|
priv->td_pending = nread;
|
2020-03-31 16:05:48 +02:00
|
|
|
}
|
2019-05-22 15:46:40 +02:00
|
|
|
|
|
|
|
/* Process the buffered telnet data */
|
|
|
|
|
2019-06-03 16:20:21 +02:00
|
|
|
src = &priv->td_rxbuffer[priv->td_offset];
|
2020-03-31 16:05:48 +02:00
|
|
|
nread = telnet_receive(priv, src, priv->td_pending, buffer, len);
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
2020-03-31 16:05:48 +02:00
|
|
|
while (nread == 0);
|
2015-12-07 16:26:57 +01:00
|
|
|
|
2022-09-28 18:29:04 +02:00
|
|
|
#ifdef HAVE_SIGNALS
|
|
|
|
/* Check if any of the received characters is a
|
|
|
|
* control that should generate a signal.
|
|
|
|
*/
|
2021-06-01 08:03:56 +02:00
|
|
|
|
2022-09-28 18:29:04 +02:00
|
|
|
telnet_check_ctrlchar(priv, buffer, nread);
|
|
|
|
#endif
|
2021-06-01 08:03:56 +02:00
|
|
|
|
2018-02-01 17:00:02 +01:00
|
|
|
/* Returned Value:
|
2015-12-07 16:26:57 +01:00
|
|
|
*
|
2020-03-31 16:05:48 +02:00
|
|
|
* nread > 0: The number of characters copied into the user buffer by
|
|
|
|
* telnet_receive().
|
|
|
|
* nread <= 0: Loss of connection or error events reported by recv().
|
2015-12-07 16:26:57 +01:00
|
|
|
*/
|
|
|
|
|
2020-03-31 16:05:48 +02:00
|
|
|
return nread;
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: telnet_write
|
|
|
|
****************************************************************************/
|
|
|
|
|
2019-01-05 19:14:05 +01:00
|
|
|
static ssize_t telnet_write(FAR struct file *filep, FAR const char *buffer,
|
|
|
|
size_t len)
|
2015-12-07 16:26:57 +01:00
|
|
|
{
|
|
|
|
FAR struct inode *inode = filep->f_inode;
|
|
|
|
FAR struct telnet_dev_s *priv = inode->i_private;
|
|
|
|
FAR const char *src = buffer;
|
2022-09-28 18:29:04 +02:00
|
|
|
ssize_t ret = 0;
|
2015-12-07 16:26:57 +01:00
|
|
|
ssize_t nsent;
|
|
|
|
int ncopied;
|
|
|
|
char ch;
|
|
|
|
bool eol;
|
|
|
|
|
2020-11-23 09:47:52 +01:00
|
|
|
ninfo("len: %zd\n", len);
|
2015-12-07 16:26:57 +01:00
|
|
|
|
|
|
|
/* Process each character from the user buffer */
|
|
|
|
|
|
|
|
for (nsent = 0, ncopied = 0; nsent < len; nsent++)
|
|
|
|
{
|
|
|
|
/* Get the next character from the user buffer */
|
|
|
|
|
|
|
|
ch = *src++;
|
|
|
|
|
|
|
|
/* Add the character to the TX buffer */
|
|
|
|
|
|
|
|
eol = telnet_putchar(priv, ch, &ncopied);
|
|
|
|
|
|
|
|
/* Was that the end of a line? Or is the buffer too full to hold the
|
2020-02-05 09:24:54 +01:00
|
|
|
* next largest character sequence ("\r\n")?
|
2015-12-07 16:26:57 +01:00
|
|
|
*/
|
|
|
|
|
2020-02-05 09:24:54 +01:00
|
|
|
if (eol || ncopied > CONFIG_TELNET_TXBUFFER_SIZE - 2)
|
2015-12-07 16:26:57 +01:00
|
|
|
{
|
|
|
|
/* Yes... send the data now */
|
|
|
|
|
|
|
|
ret = psock_send(&priv->td_psock, priv->td_txbuffer, ncopied, 0);
|
|
|
|
if (ret < 0)
|
|
|
|
{
|
2020-11-23 09:47:52 +01:00
|
|
|
nerr("ERROR: psock_send failed '%s': %zd\n",
|
2019-01-05 19:14:05 +01:00
|
|
|
priv->td_txbuffer, ret);
|
2022-09-28 16:41:04 +02:00
|
|
|
goto out;
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Reset the index to the beginning of the TX buffer. */
|
|
|
|
|
|
|
|
ncopied = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Send anything remaining in the TX buffer */
|
|
|
|
|
|
|
|
if (ncopied > 0)
|
|
|
|
{
|
|
|
|
ret = psock_send(&priv->td_psock, priv->td_txbuffer, ncopied, 0);
|
|
|
|
if (ret < 0)
|
|
|
|
{
|
2020-11-23 09:47:52 +01:00
|
|
|
nerr("ERROR: psock_send failed '%s': %zd\n",
|
2020-02-07 14:16:21 +01:00
|
|
|
priv->td_txbuffer, ret);
|
2022-09-28 16:41:04 +02:00
|
|
|
goto out;
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Notice that we don't actually return the number of bytes sent, but
|
|
|
|
* rather, the number of bytes that the caller asked us to send. We may
|
2020-02-05 09:24:54 +01:00
|
|
|
* have sent more bytes (because of CR-LF expansion). But it confuses
|
|
|
|
* some logic if you report that you sent more than you were requested to.
|
2015-12-07 16:26:57 +01:00
|
|
|
*/
|
|
|
|
|
2022-09-28 16:41:04 +02:00
|
|
|
out:
|
|
|
|
return nsent ? nsent : ret;
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
2015-12-07 20:48:06 +01:00
|
|
|
* Name: telnet_session
|
2015-12-07 16:26:57 +01:00
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Create a character driver to "wrap" the telnet session. This function
|
|
|
|
* will select and return a unique path for the new telnet device.
|
|
|
|
*
|
2018-03-13 16:52:27 +01:00
|
|
|
* Input Parameters:
|
2015-12-07 20:48:06 +01:00
|
|
|
* session - On input, contains the socket descriptor that represents the
|
2019-01-05 19:14:05 +01:00
|
|
|
* new telnet connection. On output, it holds the path to the new Telnet
|
|
|
|
* driver.
|
2015-12-07 16:26:57 +01:00
|
|
|
*
|
2018-02-01 17:00:02 +01:00
|
|
|
* Returned Value:
|
2015-12-07 20:48:06 +01:00
|
|
|
* Zero (OK) on success; a negated errno value on failure.
|
2015-12-07 16:26:57 +01:00
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
2015-12-07 20:48:06 +01:00
|
|
|
static int telnet_session(FAR struct telnet_session_s *session)
|
2015-12-07 16:26:57 +01:00
|
|
|
{
|
|
|
|
FAR struct telnet_dev_s *priv;
|
|
|
|
FAR struct socket *psock;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
/* Allocate instance data for this driver */
|
|
|
|
|
2020-02-05 10:52:26 +01:00
|
|
|
priv = (FAR struct telnet_dev_s *)kmm_zalloc(sizeof(struct telnet_dev_s));
|
2015-12-07 16:26:57 +01:00
|
|
|
if (!priv)
|
|
|
|
{
|
2016-06-20 20:44:38 +02:00
|
|
|
nerr("ERROR: Failed to allocate the driver data structure\n");
|
2015-12-07 20:48:06 +01:00
|
|
|
return -ENOMEM;
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
|
2019-01-05 19:14:05 +01:00
|
|
|
priv->td_state = STATE_NORMAL;
|
|
|
|
priv->td_crefs = 0;
|
2020-02-05 10:57:58 +01:00
|
|
|
priv->td_minor = 0;
|
2019-01-05 19:14:05 +01:00
|
|
|
priv->td_pending = 0;
|
|
|
|
priv->td_offset = 0;
|
2019-05-21 17:57:46 +02:00
|
|
|
#ifdef HAVE_SIGNALS
|
2022-03-21 23:47:09 +01:00
|
|
|
priv->td_pid = INVALID_PROCESS_ID;
|
2019-05-21 17:57:46 +02:00
|
|
|
#endif
|
2019-01-05 19:14:05 +01:00
|
|
|
#ifdef CONFIG_TELNET_SUPPORT_NAWS
|
|
|
|
priv->td_rows = 25;
|
|
|
|
priv->td_cols = 80;
|
|
|
|
priv->td_sb_count = 0;
|
|
|
|
#endif
|
2015-12-07 16:26:57 +01:00
|
|
|
|
|
|
|
/* Clone the internal socket structure. We do this so that it will be
|
|
|
|
* independent of threads and of socket descriptors (the original socket
|
|
|
|
* instance resided in the daemon's task group`).
|
|
|
|
*/
|
|
|
|
|
2015-12-07 20:48:06 +01:00
|
|
|
psock = sockfd_socket(session->ts_sd);
|
2015-12-07 16:26:57 +01:00
|
|
|
if (!psock)
|
|
|
|
{
|
2019-01-05 19:14:05 +01:00
|
|
|
nerr("ERROR: Failed to convert sd=%d to a socket structure\n",
|
|
|
|
session->ts_sd);
|
2015-12-07 20:48:06 +01:00
|
|
|
ret = -EINVAL;
|
2015-12-07 16:26:57 +01:00
|
|
|
goto errout_with_dev;
|
|
|
|
}
|
|
|
|
|
2020-01-31 09:44:28 +01:00
|
|
|
ret = psock_dup2(psock, &priv->td_psock);
|
2015-12-07 16:26:57 +01:00
|
|
|
if (ret < 0)
|
|
|
|
{
|
2020-01-31 09:44:28 +01:00
|
|
|
nerr("ERROR: psock_dup2 failed: %d\n", ret);
|
2015-12-07 16:26:57 +01:00
|
|
|
goto errout_with_dev;
|
|
|
|
}
|
|
|
|
|
2020-02-23 09:50:23 +01:00
|
|
|
/* Allocate a unique minor device number of the telnet driver.
|
2015-12-07 20:48:06 +01:00
|
|
|
* Get exclusive access to the minor counter.
|
|
|
|
*/
|
2015-12-07 16:26:57 +01:00
|
|
|
|
2020-02-05 10:57:58 +01:00
|
|
|
ret = nxsem_wait_uninterruptible(&g_clients_sem);
|
2020-01-02 17:49:34 +01:00
|
|
|
if (ret < 0)
|
2015-12-07 16:26:57 +01:00
|
|
|
{
|
2020-01-02 17:49:34 +01:00
|
|
|
nerr("ERROR: nxsem_wait failed: %d\n", ret);
|
|
|
|
goto errout_with_clone;
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
|
2015-12-07 20:48:06 +01:00
|
|
|
/* Loop until the device name is verified to be unique. */
|
2015-12-07 16:26:57 +01:00
|
|
|
|
2020-02-05 10:57:58 +01:00
|
|
|
while (priv->td_minor < CONFIG_TELNET_MAXLCLIENTS)
|
2015-12-07 20:48:06 +01:00
|
|
|
{
|
2020-02-05 10:57:58 +01:00
|
|
|
if (g_telnet_clients[priv->td_minor] == NULL)
|
|
|
|
{
|
|
|
|
snprintf(session->ts_devpath, TELNET_DEVPATH_MAX,
|
2020-02-05 10:52:26 +01:00
|
|
|
TELNET_DEVFMT, priv->td_minor);
|
2020-02-05 10:57:58 +01:00
|
|
|
break;
|
|
|
|
}
|
2020-02-07 14:16:21 +01:00
|
|
|
|
2020-02-05 10:57:58 +01:00
|
|
|
priv->td_minor++;
|
2015-12-07 20:48:06 +01:00
|
|
|
}
|
|
|
|
|
2020-02-05 10:57:58 +01:00
|
|
|
if (priv->td_minor >= CONFIG_TELNET_MAXLCLIENTS)
|
2015-12-07 16:26:57 +01:00
|
|
|
{
|
2016-06-20 20:44:38 +02:00
|
|
|
nerr("ERROR: Too many sessions\n");
|
2015-12-07 20:48:06 +01:00
|
|
|
ret = -ENFILE;
|
|
|
|
goto errout_with_semaphore;
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Register the driver */
|
|
|
|
|
2015-12-07 20:48:06 +01:00
|
|
|
ret = register_driver(session->ts_devpath, &g_telnet_fops, 0666, priv);
|
2015-12-07 16:26:57 +01:00
|
|
|
if (ret < 0)
|
|
|
|
{
|
2016-06-20 20:44:38 +02:00
|
|
|
nerr("ERROR: Failed to register the driver %s: %d\n",
|
|
|
|
session->ts_devpath, ret);
|
2015-12-07 20:48:06 +01:00
|
|
|
goto errout_with_semaphore;
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
|
|
|
|
2021-03-04 16:35:35 +01:00
|
|
|
/* Close the original psock (keeping the clone) */
|
2015-12-07 20:48:06 +01:00
|
|
|
|
2021-03-04 16:35:35 +01:00
|
|
|
nx_close(session->ts_sd);
|
2015-12-07 20:48:06 +01:00
|
|
|
|
2019-01-19 13:43:21 +01:00
|
|
|
#ifdef CONFIG_TELNET_SUPPORT_NAWS
|
2019-01-05 19:14:05 +01:00
|
|
|
telnet_sendopt(priv, TELNET_DO, TELNET_NAWS);
|
2019-01-19 13:43:21 +01:00
|
|
|
#endif
|
2019-01-05 19:14:05 +01:00
|
|
|
|
2020-02-05 16:52:37 +01:00
|
|
|
#ifdef CONFIG_TELNET_CHARACTER_MODE
|
|
|
|
telnet_sendopt(priv, TELNET_WILL, TELNET_SGA);
|
|
|
|
telnet_sendopt(priv, TELNET_WILL, TELNET_ECHO);
|
|
|
|
#endif
|
|
|
|
|
2019-05-21 17:57:46 +02:00
|
|
|
/* Save ourself in the list of Telnet client threads */
|
|
|
|
|
2020-02-05 10:57:58 +01:00
|
|
|
g_telnet_clients[priv->td_minor] = priv;
|
2019-05-21 17:57:46 +02:00
|
|
|
nxsem_post(&g_clients_sem);
|
|
|
|
|
2015-12-07 20:48:06 +01:00
|
|
|
return OK;
|
|
|
|
|
|
|
|
errout_with_semaphore:
|
2020-02-05 10:57:58 +01:00
|
|
|
nxsem_post(&g_clients_sem);
|
2015-12-07 20:48:06 +01:00
|
|
|
|
|
|
|
errout_with_clone:
|
|
|
|
psock_close(&priv->td_psock);
|
2015-12-07 16:26:57 +01:00
|
|
|
|
|
|
|
errout_with_dev:
|
2020-08-04 18:55:59 +02:00
|
|
|
kmm_free(priv);
|
2015-12-07 20:48:06 +01:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: factory_read
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static ssize_t factory_read(FAR struct file *filep, FAR char *buffer,
|
|
|
|
size_t len)
|
|
|
|
{
|
|
|
|
return 0; /* Return EOF */
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: factory_write
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static ssize_t factory_write(FAR struct file *filep, FAR const char *buffer,
|
|
|
|
size_t len)
|
|
|
|
{
|
|
|
|
return len; /* Say that everything was written */
|
|
|
|
}
|
|
|
|
|
2020-02-05 09:12:53 +01:00
|
|
|
/****************************************************************************
|
|
|
|
* Name: telnet_ioctl
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int telnet_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
FAR struct inode *inode = filep->f_inode;
|
|
|
|
FAR struct telnet_dev_s *priv = inode->i_private;
|
|
|
|
int ret = OK;
|
|
|
|
|
|
|
|
switch (cmd)
|
|
|
|
{
|
|
|
|
#ifdef HAVE_SIGNALS
|
2020-04-12 18:09:04 +02:00
|
|
|
/* Make the given terminal the controlling terminal of the calling
|
|
|
|
* process.
|
|
|
|
*/
|
2020-02-05 09:12:53 +01:00
|
|
|
|
|
|
|
case TIOCSCTTY:
|
|
|
|
{
|
|
|
|
/* Check if the ISIG flag is set in the termios c_lflag to enable
|
|
|
|
* this feature. This flag is set automatically for a serial console
|
|
|
|
* device.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* Save the PID of the recipient of the SIGINT signal. */
|
|
|
|
|
|
|
|
priv->td_pid = (pid_t)arg;
|
|
|
|
DEBUGASSERT((unsigned long)(priv->td_pid) == arg);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_TELNET_SUPPORT_NAWS
|
|
|
|
case TIOCGWINSZ:
|
|
|
|
{
|
|
|
|
FAR struct winsize *pw = (FAR struct winsize *)((uintptr_t)arg);
|
|
|
|
|
|
|
|
/* Get row/col from the private data */
|
|
|
|
|
|
|
|
pw->ws_row = priv->td_rows;
|
|
|
|
pw->ws_col = priv->td_cols;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
default:
|
2022-09-28 18:29:04 +02:00
|
|
|
ret = psock_ioctl(&priv->td_psock, cmd, arg);
|
2020-02-05 09:12:53 +01:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2019-01-05 19:14:05 +01:00
|
|
|
/****************************************************************************
|
|
|
|
* Name: telnet_poll
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* The standard poll() operation redirects operations on socket descriptors
|
|
|
|
* to this function.
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* fd - The socket descriptor of interest
|
|
|
|
* 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
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int telnet_poll(FAR struct file *filep, FAR struct pollfd *fds,
|
|
|
|
bool setup)
|
|
|
|
{
|
|
|
|
FAR struct inode *inode = filep->f_inode;
|
|
|
|
FAR struct telnet_dev_s *priv = inode->i_private;
|
|
|
|
|
|
|
|
DEBUGASSERT(fds != NULL);
|
|
|
|
|
|
|
|
/* Test if we have cached data waiting to be read */
|
|
|
|
|
|
|
|
if (priv->td_pending > 0)
|
|
|
|
{
|
|
|
|
/* Yes.. then signal the poll logic */
|
|
|
|
|
2022-09-19 05:08:57 +02:00
|
|
|
poll_notify(&fds, 1, POLLRDNORM);
|
2019-01-05 19:14:05 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Then let psock_poll() do the heavy lifting */
|
|
|
|
|
2022-09-28 16:45:15 +02:00
|
|
|
return psock_poll(&priv->td_psock, fds, setup);
|
2019-01-05 19:14:05 +01:00
|
|
|
}
|
|
|
|
|
2015-12-07 20:48:06 +01:00
|
|
|
/****************************************************************************
|
2020-02-05 09:12:53 +01:00
|
|
|
* Name: factory_ioctl
|
2015-12-07 20:48:06 +01:00
|
|
|
****************************************************************************/
|
|
|
|
|
2020-02-05 09:12:53 +01:00
|
|
|
static int factory_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
|
2015-12-07 20:48:06 +01:00
|
|
|
{
|
2020-02-05 09:12:53 +01:00
|
|
|
int ret = OK;
|
2015-12-07 20:48:06 +01:00
|
|
|
|
|
|
|
switch (cmd)
|
|
|
|
{
|
|
|
|
/* Command: SIOCTELNET
|
|
|
|
* Description: Create a Telnet sessions.
|
|
|
|
* Argument: A pointer to a write-able instance of struct
|
|
|
|
* telnet_session_s.
|
|
|
|
* Dependencies: CONFIG_NETDEV_TELNET
|
|
|
|
*/
|
|
|
|
|
|
|
|
case SIOCTELNET:
|
|
|
|
{
|
2019-05-21 17:57:46 +02:00
|
|
|
FAR struct telnet_session_s *session =
|
2020-02-05 09:12:53 +01:00
|
|
|
(FAR struct telnet_session_s *)((uintptr_t)arg);
|
2015-12-07 20:48:06 +01:00
|
|
|
|
|
|
|
if (session == NULL)
|
|
|
|
{
|
|
|
|
ret = -EINVAL;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
ret = telnet_session(session);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
ret = -ENOTTY;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
2015-12-07 16:26:57 +01:00
|
|
|
}
|
2015-12-07 20:48:06 +01:00
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Public Functions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: telnet_initialize
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Create the Telnet factory at /dev/telnet.
|
|
|
|
*
|
2018-03-13 16:52:27 +01:00
|
|
|
* Input Parameters:
|
2015-12-07 20:48:06 +01:00
|
|
|
* None
|
|
|
|
*
|
2018-02-01 17:00:02 +01:00
|
|
|
* Returned Value:
|
2015-12-07 20:48:06 +01:00
|
|
|
* Zero (OK) on success; a negated errno value on failure.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
int telnet_initialize(void)
|
|
|
|
{
|
|
|
|
return register_driver("/dev/telnet", &g_factory_fops, 0666, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* CONFIG_NETDEV_TELNET */
|