Add Interactive Mode to Comms

comm.interact() will drop the user into an "interactive" mode where they
can directly control what is sent.  A SIGINT (Ctrl+C) will drop the
script out of interactive mode and continue executing the rest of the
script.  If the output of the program (input into our script) goes into
a broken state (such as when the target program exits), interactive mode
will automatically exit.

Signed-off-by: dusoleil <howcansocksbereal@gmail.com>

1 files changed, 49 insertions, 1 deletions

diff --git a/sploit/comm.py b/sploit/comm.py
index 9b68c38..0b5bc2a 100644
--- a/sploit/comm.py
+++ b/sploit/comm.py
@@ -1,6 +1,10 @@
 import subprocess
+import threading
 import tempfile
 import os
+import sys
+import select
+import signal
 
 from sploit.log import log
 
@@ -43,13 +47,57 @@ class Comm:
     def writeline(self, data):
         self.write(data + b'\n')
 
+    def interact(self):
+        print("Interact Mode")
+        syncstop = threading.Event()
+        def readloop():
+            poll = select.poll()
+            poll.register(self.back.stdin)
+            def readall():
+                while(True):
+                    data = self.back.stdin.readline()
+                    if(data == b''):
+                        break
+                    log(data)
+            while not syncstop.isSet():
+                readall()
+                dat = poll.poll(100)
+                if(len(dat)>0):
+                    if(dat[0][1] & select.POLLIN):
+                        readall()
+                    else:
+                        syncstop.set()
+        os.set_blocking(self.back.stdin.fileno(),False)
+        readthread = threading.Thread(target=readloop,daemon=True)
+        readthread.start()
+        stdin = sys.stdin.buffer
+        signal.signal(signal.SIGALRM,lambda: 0)
+        while not syncstop.isSet():
+            try:
+                signal.alarm(1)
+                data = stdin.readline()
+                if(data and not syncstop.isSet()):
+                    self.write(data)
+                else:
+                    break
+            except TypeError:
+                pass
+            except KeyboardInterrupt:
+                break
+        signal.alarm(0)
+        syncstop.set()
+        readthread.join()
+        os.set_blocking(self.back.stdin.fileno(),True)
+        print("Interact Mode Done")
+
 class Process:
     def __init__(self, args):
         print(f"Running: {' '.join(args)}")
         self.proc = subprocess.Popen(args,
                 stdin=subprocess.PIPE,
                 stdout=subprocess.PIPE,
-                stderr=subprocess.STDOUT)
+                stderr=subprocess.STDOUT,
+                preexec_fn=lambda : os.setpgrp())
         print(f"PID: {self.proc.pid}")
         self.stdin = self.proc.stdout
         self.stdout = self.proc.stdin