Implement Tubes#recvall

Closes #68

lib/pwnlib/tubes/buffer.rb

@@ -64,7 +64,7 @@ def unget(data)
 
       # Retrieves bytes from the buffer.
       #
-      # @param [Integer] n
+      # @param [Integer?] n
       #   Maximum number of bytes to fetch.
       #
       # @return [String]

lib/pwnlib/tubes/tube.rb

@@ -271,6 +271,22 @@ def recvregex(regex, timeout: nil)
         recvpred(timeout: timeout) { |data| data =~ regex }
       end
 
+      # Receives data until reaching EOF or a timeout is occurred.
+      #
+      # @!macro timeout_definition
+      #
+      # @return [String]
+      #   Returns the data received.
+      def recvall(timeout: nil)
+        recvn(1 << 63, timeout: timeout)
+      rescue ::Pwnlib::Errors::EndOfTubeError, ::Pwnlib::Errors::TimeoutError
+        @buffer.get
+      end
+      alias readall recvall
+      # match Ruby's naming convention
+      alias recv_all recvall
+      alias read_all recvall
+
       # Sends data.
       #
       # @param [String] data

test/tubes/tube_test.rb

@@ -197,6 +197,13 @@ def test_recvregex
     5.times { assert_match(r, t.recvregex(r)) }
   end
 
+  def test_recvall
+    t = basic_tube
+    t.unrecv('meow')
+    assert_equal('meow', t.recvall)
+    assert_equal('', t.recvall)
+  end
+
   def test_send
     t = hello_tube
     assert_equal(6, t.write('DARKHH'))