Add the ability to run a server from the command line tool.

Change-Id: Ia8588aeaad8b44a6a306d7d5bfecc895adde1910
diff --git a/tool/transport_common.h b/tool/transport_common.h
new file mode 100644
index 0000000..6b96659
--- /dev/null
+++ b/tool/transport_common.h
@@ -0,0 +1,41 @@
+/* Copyright (c) 2014, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#ifndef OPENSSL_HEADER_TOOL_TRANSPORT_COMMON_H
+#define OPENSSL_HEADER_TOOL_TRANSPORT_COMMON_H
+
+#include <openssl/ssl.h>
+#include <string.h>
+
+
+// Connect sets |*out_sock| to be a socket connected to the destination given
+// in |hostname_and_port|, which should be of the form "www.example.com:123".
+// It returns true on success and false otherwise.
+bool Connect(int *out_sock, const std::string &hostname_and_port);
+
+// Accept sets |*out_sock| to be a socket connected to the port given
+// in |port|, which should be of the form "123".
+// It returns true on success and false otherwise.
+bool Accept(int *out_sock, const std::string &port);
+
+void PrintConnectionInfo(const SSL *ssl);
+
+bool SocketSetNonBlocking(int sock, bool is_non_blocking);
+
+int PrintErrorCallback(const char *str, size_t len, void *ctx);
+
+bool TransferData(SSL *ssl, int sock);
+
+
+#endif  /* !OPENSSL_HEADER_TOOL_TRANSPORT_COMMON_H */