1 files changed, 459 insertions, 0 deletions
diff --git a/apps/netutils/telnetd/telnetd.c b/apps/netutils/telnetd/telnetd.c
new file mode 100644
index 000000000..ccadd60dd
--- /dev/null
+++ b/apps/netutils/telnetd/telnetd.c
@@ -0,0 +1,459 @@
+/****************************************************************************
+ * netutils/telnetd/telnetd.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * This is a leverage of similar logic from uIP:
+ *
+ *   Author: Adam Dunkels <adam@sics.se>
+ *   Copyright (c) 2003, Adam Dunkels.
+ *   All rights reserved.
+ *
+ * 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 of the Institute 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 INSTITUTE 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 INSTITUTE 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 <sys/types.h>
+#include <sys/socket.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <pthread.h>
+#include <debug.h>
+
+#include <apps/netutils/telnetd.h>
+#include <apps/netutils/uiplib.h>
+
+#include "shell.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+#define ISO_nl       0x0a
+#define ISO_cr       0x0d
+
+#define STATE_NORMAL 0
+#define STATE_IAC    1
+#define STATE_WILL   2
+#define STATE_WONT   3
+#define STATE_DO     4
+#define STATE_DONT   5
+#define STATE_CLOSE  6
+
+#define TELNET_IAC   255
+#define TELNET_WILL  251
+#define TELNET_WONT  252
+#define TELNET_DO    253
+#define TELNET_DONT  254
+
+/* Configurable settings */
+
+#ifndef CONFIG_NETUTILS_IOBUFFER_SIZE
+# define CONFIG_NETUTILS_IOBUFFER_SIZE 512
+#endif
+
+#ifndef CONFIG_NETUTILS_CMD_SIZE
+# define CONFIG_NETUTILS_CMD_SIZE 40
+#endif
+
+/* As threads are created to handle each request, a stack must be allocated
+ * for the thread.  Use a default if the user provided no stacksize.
+ */
+
+#ifndef CONFIG_NETUTILS_TELNETDSTACKSIZE
+# define CONFIG_NETUTILS_TELNETDSTACKSIZE 4096
+#endif
+
+/* Enabled dumping of all input/output buffers */
+
+#undef CONFIG_NETUTILS_TELNETD_DUMPBUFFER
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+struct telnetd_s
+{
+  int     tn_sockfd;
+  char    tn_iobuffer[CONFIG_NETUTILS_IOBUFFER_SIZE];
+  char    tn_cmd[CONFIG_NETUTILS_CMD_SIZE];
+  uint8_t tn_bufndx;
+  uint8_t tn_state;
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: telnetd_dumpbuffer
+ *
+ * Description:
+ *   Dump a buffer of data (debug only)
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_NETUTILS_TELNETD_DUMPBUFFER
+static inline void telnetd_dumpbuffer(FAR const char *msg, FAR const char *buffer, unsigned int nbytes)
+{
+  /* CONFIG_DEBUG, CONFIG_DEBUG_VERBOSE, and CONFIG_DEBUG_NET have to be
+  * defined or the following does nothing.
+  */
+    
+  nvdbgdumpbuffer(msg, (FAR const uint8_t*)buffer, nbytes);
+}
+#else
+# define telnetd_dumpbuffer(msg,buffer,nbytes)
+#endif
+
+/****************************************************************************
+ * Name: telnetd_putchar
+ *
+ * Description:
+ *   Add another parsed character to the TELNET command string
+ *
+ ****************************************************************************/
+
+static void telnetd_putchar(struct telnetd_s *pstate, uint8_t ch)
+{
+  /* Ignore carriage returns */
+
+  if (ch == ISO_cr)
+  {
+    return;
+  }
+
+  /* Add all other characters to the cmd buffer */
+
+  pstate->tn_cmd[pstate->tn_bufndx] = ch;
+
+  /* If a newline was added or if the buffer is full, then process it now */
+
+  if (ch == ISO_nl || pstate->tn_bufndx == (CONFIG_NETUTILS_CMD_SIZE - 1))
+    {
+      if (pstate->tn_bufndx > 0)
+        {
+          pstate->tn_cmd[pstate->tn_bufndx] = '\0';
+        }
+
+      telnetd_dumpbuffer("TELNET CMD", pstate->tn_cmd, strlen(pstate->tn_cmd));
+      shell_input(pstate, pstate->tn_cmd);
+      pstate->tn_bufndx = 0;
+    }
+  else
+    {
+      pstate->tn_bufndx++;
+      vdbg("Add '%c', bufndx=%d\n", ch, pstate->tn_bufndx);
+    }
+}
+
+/****************************************************************************
+ * Name: telnetd_sendopt
+ *
+ * Description:
+ *
+ ****************************************************************************/
+
+static void telnetd_sendopt(struct telnetd_s *pstate, uint8_t option, uint8_t value)
+{
+  uint8_t optbuf[4];
+  optbuf[0] = TELNET_IAC;
+  optbuf[1] = option;
+  optbuf[2] = value;
+  optbuf[3] = 0;
+
+  telnetd_dumpbuffer("Send optbuf", optbuf, 4);
+  if (send(pstate->tn_sockfd, optbuf, 4, 0) < 0)
+    {
+      dbg("[%d] Failed to send TELNET_IAC\n", pstate->tn_sockfd);
+    }
+}
+
+/****************************************************************************
+ * Name: telnetd_receive
+ *
+ * Description:
+ *   Process a received TELENET buffer
+ *
+ ****************************************************************************/
+
+static int telnetd_receive(struct telnetd_s *pstate, size_t len)
+{
+  char *ptr = pstate->tn_iobuffer;
+  uint8_t ch;
+
+  while (len > 0)
+    {
+      ch = *ptr++;
+      len--;
+
+      vdbg("ch=%02x state=%d\n", ch, pstate->tn_state);
+      switch (pstate->tn_state)
+        {
+          case STATE_IAC:
+            if (ch == TELNET_IAC)
+              {
+                telnetd_putchar(pstate, ch);
+                pstate->tn_state = STATE_NORMAL;
+             }
+            else
+              {
+                switch (ch)
+                  {
+                    case TELNET_WILL:
+                      pstate->tn_state = STATE_WILL;
+                      break;
+
+                    case TELNET_WONT:
+                      pstate->tn_state = STATE_WONT;
+                      break;
+
+                    case TELNET_DO:
+                      pstate->tn_state = STATE_DO;
+                      break;
+
+                    case TELNET_DONT:
+                      pstate->tn_state = STATE_DONT;
+                      break;
+
+                    default:
+                      pstate->tn_state = STATE_NORMAL;
+                      break;
+                  }
+              }
+            break;
+
+          case STATE_WILL:
+            /* Reply with a DONT */
+
+            telnetd_sendopt(pstate, TELNET_DONT, ch);
+            pstate->tn_state = STATE_NORMAL;
+            break;
+
+          case STATE_WONT:
+            /* Reply with a DONT */
+
+            telnetd_sendopt(pstate, TELNET_DONT, ch);
+            pstate->tn_state = STATE_NORMAL;
+            break;
+
+          case STATE_DO:
+            /* Reply with a WONT */
+
+            telnetd_sendopt(pstate, TELNET_WONT, ch);
+            pstate->tn_state = STATE_NORMAL;
+            break;
+
+          case STATE_DONT:
+            /* Reply with a WONT */
+
+            telnetd_sendopt(pstate, TELNET_WONT, ch);
+            pstate->tn_state = STATE_NORMAL;
+            break;
+
+          case STATE_NORMAL:
+            if (ch == TELNET_IAC)
+              {
+                pstate->tn_state = STATE_IAC;
+              }
+            else
+              {
+                telnetd_putchar(pstate, ch);
+              }
+            break;
+        }
+    }
+  return OK;
+}
+
+/****************************************************************************
+ * Name: telnetd_handler
+ *
+ * Description:
+ *   Each time a new connection to port 23 is made, a new thread is created
+ *   that begins at this entry point.  There should be exactly one argument
+ *   and it should be the socket descriptor (+1).
+ *
+ ****************************************************************************/
+
+static void *telnetd_handler(void *arg)
+{
+  struct telnetd_s *pstate = (struct telnetd_s *)malloc(sizeof(struct telnetd_s));
+  int               sockfd = (int)arg;
+  int               ret    = ERROR;
+
+  dbg("[%d] Started\n", sockfd);
+
+  /* Verify that the state structure was successfully allocated */
+
+  if (pstate)
+    {
+      /* Initialize the thread state structure */
+
+      memset(pstate, 0, sizeof(struct telnetd_s));
+      pstate->tn_sockfd = sockfd;
+      pstate->tn_state  = STATE_NORMAL;
+
+      /* Start up the shell */
+
+      shell_init(pstate);
+      shell_start(pstate);
+
+      /* Loop processing each TELNET command */
+      do
+        {
+          /* Read a buffer of data from the TELNET client */
+
+          ret = recv(pstate->tn_sockfd, pstate->tn_iobuffer, CONFIG_NETUTILS_IOBUFFER_SIZE, 0);
+          if (ret > 0)
+            {
+
+              /* Process the received TELNET data */
+
+              telnetd_dumpbuffer("Received buffer", pstate->tn_iobuffer, ret);
+              ret = telnetd_receive(pstate, ret);
+            }
+        }
+      while (ret >= 0 && pstate->tn_state != STATE_CLOSE);
+      dbg("[%d] ret=%d tn_state=%d\n", sockfd, ret, pstate->tn_state);
+
+      /* End of command processing -- Clean up and exit */
+
+      free(pstate);
+    }
+
+  /* Exit the task */
+
+  dbg("[%d] Exitting\n", sockfd);
+  close(sockfd);
+  return NULL;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: telnetd_init
+ *
+ * Description:
+ *   This is the main processing thread for telnetd.  It never returns
+ *   unless an error occurs
+ *
+ ****************************************************************************/
+
+void telnetd_init(void)
+{
+  /* Execute telnetd_handler on each connection to port 23 */
+
+  uip_server(HTONS(23), telnetd_handler, CONFIG_NETUTILS_TELNETDSTACKSIZE);
+}
+
+/****************************************************************************
+ * Name: shell_prompt
+ *
+ * Description:
+ *   Print a prompt to the shell window.
+ *
+ *   This function can be used by the shell back-end to print out a prompt
+ *   to the shell window.
+ *
+ ****************************************************************************/
+
+void shell_prompt(void *handle, char *str)
+{
+  struct telnetd_s *pstate = (struct telnetd_s *)handle;
+  int len = strlen(str);
+
+  strncpy(pstate->tn_iobuffer, str, len);
+  telnetd_dumpbuffer("Shell prompt", pstate->tn_iobuffer, len);
+  if (send(pstate->tn_sockfd, pstate->tn_iobuffer, len, 0) < 0)
+    {
+      dbg("[%d] Failed to send prompt\n", pstate->tn_sockfd);
+    }
+}
+
+/****************************************************************************
+ * Name: shell_output
+ *
+ * Description:
+ *   Print a string to the shell window.
+ *
+ *   This function is implemented by the shell GUI / telnet server and
+ *   can be called by the shell back-end to output a string in the
+ *   shell window. The string is automatically appended with a linebreak.
+ *
+ ****************************************************************************/
+
+void shell_output(void *handle, const char *fmt, ...)
+{
+  struct telnetd_s *pstate = (struct telnetd_s *)handle;
+  unsigned len;
+  va_list ap;
+
+  va_start(ap, fmt);
+  vsnprintf(pstate->tn_iobuffer, CONFIG_NETUTILS_IOBUFFER_SIZE, fmt, ap);
+  va_end(ap);
+
+  len = strlen(pstate->tn_iobuffer);
+  if (len < CONFIG_NETUTILS_IOBUFFER_SIZE - 2)
+    {
+      pstate->tn_iobuffer[len]   = ISO_cr;
+      pstate->tn_iobuffer[len+1] = ISO_nl;
+      pstate->tn_iobuffer[len+2] = '\0';
+    }
+
+  telnetd_dumpbuffer("Shell output", pstate->tn_iobuffer, len+2);
+  if (send(pstate->tn_sockfd, pstate->tn_iobuffer, len+2, 0) < 0)
+    {
+      dbg("[%d] Failed to send response\n", pstate->tn_sockfd);
+    }
+}
+
+/****************************************************************************
+ * Name: shell_quit
+ *
+ * Description:
+ *   Quit the shell
+ *
+ ****************************************************************************/
+
+void shell_quit(void *handle, char *str)
+{
+  struct telnetd_s *pstate = (struct telnetd_s *)handle;
+  pstate->tn_state = STATE_CLOSE;
+}
+