system: telnetd: Add telnetd app

Summary:
- This commit adds telnetd app

Impact:
- None

Testing:
- Tested with sabre-6quad:netknsh (will be updated later)

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

system/telnetd/Kconfig

@@ -0,0 +1,39 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config SYSTEM_TELNETD
+	tristate "Telnet daemon application"
+	default n
+	depends on NETUTILS_TELNETD
+	---help---
+		Enable the Telnet daemon application
+
+config SYSTEM_TELNETD_PROGNAME
+	string "Telnetd program name"
+	default "telnetd"
+	depends on SYSTEM_TELNETD
+	---help---
+		This is the name of the program that will be used when the NSH ELF
+		program is installed.
+
+config SYSTEM_TELNETD_PRIORITY
+	int "Telnetd task priority"
+	default 100
+	depends on SYSTEM_TELNETD
+
+config SYSTEM_TELNETD_STACKSIZE
+	int "Telnetd task stack size"
+	default DEFAULT_TASK_STACKSIZE
+	depends on SYSTEM_TELNETD
+
+config SYSTEM_TELNETD_SESSION_PRIORITY
+	int "Telnetd session task priority"
+	default 100
+	depends on SYSTEM_TELNETD
+
+config SYSTEM_TELNETD_SESSION_STACKSIZE
+	int "Telnetd session task stack size"
+	default 3072
+	depends on SYSTEM_TELNETD

system/telnetd/Make.defs

@@ -0,0 +1,23 @@
+############################################################################
+# apps/system/telnetd/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifneq ($(CONFIG_SYSTEM_TELNETD),)
+CONFIGURED_APPS += $(APPDIR)/system/telnetd
+endif

system/telnetd/Makefile

@@ -0,0 +1,34 @@
+############################################################################
+# apps/system/telnetd/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# telnetd
+
+PROGNAME  := $(CONFIG_SYSTEM_TELNETD_PROGNAME)
+PRIORITY  := $(CONFIG_SYSTEM_TELNETD_PRIORITY)
+STACKSIZE := $(CONFIG_SYSTEM_TELNETD_STACKSIZE)
+MODULE    := $(CONFIG_SYSTEM_TELNETD)
+
+# Files
+
+MAINSRC := telnetd.c
+
+include $(APPDIR)/Application.mk

system/telnetd/telnetd.c

@@ -0,0 +1,61 @@
+/****************************************************************************
+ * apps/system/telnetd/telnetd.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "netutils/telnetd.h"
+#include "netutils/netlib.h"
+#include "nshlib/nshlib.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int main(int argc, FAR char *argv[])
+{
+  FAR char *argv1[3];
+  char arg0[sizeof("0x1234567812345678")];
+  struct telnetd_s daemon;
+
+  /* Initialize the daemon structure */
+
+  daemon.port      = HTONS(23);
+  daemon.family    = AF_INET;
+  daemon.entry     = nsh_telnetmain;
+
+  /* NOTE: Settings for telnet session task */
+
+  daemon.priority  = CONFIG_SYSTEM_TELNETD_SESSION_PRIORITY;
+  daemon.stacksize = CONFIG_SYSTEM_TELNETD_SESSION_STACKSIZE;
+
+  snprintf(arg0, sizeof(arg0), "0x%" PRIxPTR, (uintptr_t)&daemon);
+  argv1[0] = "telnetd";
+  argv1[1] = arg0;
+  argv1[2] = NULL;
+
+  telnetd_daemon(2, argv1);
+  return 0;
+}