From 07207612d62cf66374e88da883089b450267a60b Mon Sep 17 00:00:00 2001
From: Michel Oosterhof <michel@oosterhof.net>
Date: Wed, 17 May 2017 16:57:56 +0400
Subject: [PATCH] initial version of dd command

---
 cowrie/commands/__init__.py |  1 +
 cowrie/commands/dd.py       | 75 +++++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+)
 create mode 100644 cowrie/commands/dd.py

diff --git a/cowrie/commands/__init__.py b/cowrie/commands/__init__.py
index 9f0f1a01..a85596f1 100644
--- a/cowrie/commands/__init__.py
+++ b/cowrie/commands/__init__.py
@@ -7,6 +7,7 @@ __all__ = [
     'base',
     'busybox',
     'curl',
+    'dd',
     'env',
     'ethtool',
     'free',
diff --git a/cowrie/commands/dd.py b/cowrie/commands/dd.py
new file mode 100644
index 00000000..490f75ed
--- /dev/null
+++ b/cowrie/commands/dd.py
@@ -0,0 +1,75 @@
+# Copyright (c) 2016 Michel Oosterhof <michel@oosterhof.net>
+# See the COPYRIGHT file for more information
+
+"""
+dd commands
+"""
+
+import getopt
+import copy
+from os import path
+from cowrie.core.honeypot import HoneyPotCommand
+from cowrie.core.fs import *
+
+commands = {}
+
+class command_dd(HoneyPotCommand):
+    """
+    dd command
+    """
+
+    ddargs = {}
+
+    def start(self):
+        if not self.args or self.args[0] == '>':
+            return
+
+        for arg in self.args:
+            if not arg.index('='):
+                self.write('unknown operand: {}'.format(arg))
+                HoneyPotCommand.exit()
+            operand, value = arg.split('=')
+            if operand not in ('if', 'bs', 'of'):
+                self.write('unknown operand: {}'.format(operand))
+                self.exit(success=False)
+            self.ddargs[operand] = value
+
+        if self.input_data:
+            self.write(self.input_data)
+        else:
+            for arg in self.ddargs.keys():
+                value = self.ddargs[arg]
+                if arg == 'if':
+                    pname = self.fs.resolve_path(value, self.protocol.cwd)
+                    if self.fs.isdir(pname):
+                        self.errorWrite('dd: {}: Is a directory\n'.format(value))
+                        continue
+                    try:
+                        self.write(self.fs.file_contents(pname))
+                    except:
+                        self.errorWrite('dd: {}: No such file or directory\n'.format(value))
+                        HoneyPotCommand.exit(self)
+        self.exit()
+
+
+    def exit(self, success=True):
+        if success == True:
+            self.write('0+0 records in\n')
+            self.write('0+0 records out\n')
+            self.write('0 bytes transferred in 0.695821 secs (0 bytes/sec)\n')
+        HoneyPotCommand.exit(self)
+
+
+    def lineReceived(self, line):
+        log.msg(eventid='cowrie.session.input',
+                realm='dd',
+                input=line,
+                format='INPUT (%(realm)s): %(input)s')
+
+
+    def handle_CTRL_D(self):
+        self.exit()
+
+
+commands['/bin/dd'] = command_dd
+