/* 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>

#include <string>

// InitSocketLibrary calls the Windows socket init functions, if needed.
bool InitSocketLibrary();

// 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);

class Listener {
 public:
  Listener() {}
  ~Listener();

  // Init initializes the listener to listen on |port|, which should be of the
  // form "123".
  bool Init(const std::string &port);

  // Accept sets |*out_sock| to be a socket connected to the listener.
  bool Accept(int *out_sock);

 private:
  int server_sock_ = -1;

  Listener(const Listener &) = delete;
  Listener &operator=(const Listener &) = delete;
};

bool VersionFromString(uint16_t *out_version, const std::string &version);

void PrintConnectionInfo(BIO *bio, const SSL *ssl);

bool SocketSetNonBlocking(int sock, bool is_non_blocking);

// PrintSSLError prints information about the most recent SSL error to stderr.
// |ssl_err| must be the output of |SSL_get_error| and the |SSL| object must be
// connected to socket from |Connect|.
void PrintSSLError(FILE *file, const char *msg, int ssl_err, int ret);

bool TransferData(SSL *ssl, int sock);

// DoSMTPStartTLS performs the SMTP STARTTLS mini-protocol over |sock|. It
// returns true on success and false otherwise.
bool DoSMTPStartTLS(int sock);

// DoHTTPTunnel sends an HTTP CONNECT request over |sock|. It returns true on
// success and false otherwise.
bool DoHTTPTunnel(int sock, const std::string &hostname_and_port);

#endif  // !OPENSSL_HEADER_TOOL_TRANSPORT_COMMON_H