src/http_stream.cpp

   1 /*
   2
   3 Copyright (c) 2007, Arvid Norberg
   4 All rights reserved.
   5
   6 Redistribution and use in source and binary forms, with or without
   7 modification, are permitted provided that the following conditions
   8 are met:
   9
  10     * Redistributions of source code must retain the above copyright
  11       notice, this list of conditions and the following disclaimer.
  12     * Redistributions in binary form must reproduce the above copyright
  13       notice, this list of conditions and the following disclaimer in
  14       the documentation and/or other materials provided with the distribution.
  15     * Neither the name of the author nor the names of its
  16       contributors may be used to endorse or promote products derived
  17       from this software without specific prior written permission.
  18
  19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  23 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29 POSSIBILITY OF SUCH DAMAGE.
  30
  31 */
  32
  33 #include "libtorrent/pch.hpp"
  34
  35 #include "libtorrent/http_stream.hpp"
  36 #include "libtorrent/tracker_manager.hpp" // for base64encode
  37
  38 namespace libtorrent
  39 {
  40
  41         void http_stream::name_lookup(asio::error_code const& e, tcp::resolver::iterator i
  42                 , boost::shared_ptr<handler_type> h)
  43         {
  44                 if (e || i == tcp::resolver::iterator())
  45                 {
  46                         (*h)(e);
  47                         close();
  48                         return;
  49                 }
  50
  51                 m_sock.async_connect(i->endpoint(), boost::bind(
  52                         &http_stream::connected, this, _1, h));
  53         }
  54
  55         void http_stream::connected(asio::error_code const& e, boost::shared_ptr<handler_type> h)
  56         {
  57                 if (e)
  58                 {
  59                         (*h)(e);
  60                         close();
  61                         return;
  62                 }
  63
  64                 using namespace libtorrent::detail;
  65
  66                 if (m_no_connect)
  67                 {
  68                         std::vector<char>().swap(m_buffer);
  69                         (*h)(e);
  70                         return;
  71                 }
  72
  73                 // send CONNECT
  74                 std::back_insert_iterator<std::vector<char> > p(m_buffer);
  75                 write_string("CONNECT " + boost::lexical_cast<std::string>(m_remote_endpoint)
  76                         + " HTTP/1.0\r\n", p);
  77                 if (!m_user.empty())
  78                 {
  79                         write_string("Proxy-Authorization: Basic " + base64encode(
  80                                 m_user + ":" + m_password) + "\r\n", p);
  81                 }
  82                 write_string("\r\n", p);
  83                 asio::async_write(m_sock, asio::buffer(m_buffer)
  84                         , boost::bind(&http_stream::handshake1, this, _1, h));
  85         }
  86
  87         void http_stream::handshake1(asio::error_code const& e, boost::shared_ptr<handler_type> h)
  88         {
  89                 if (e)
  90                 {
  91                         (*h)(e);
  92                         close();
  93                         return;
  94                 }
  95
  96                 // read one byte from the socket
  97                 m_buffer.resize(1);
  98                 asio::async_read(m_sock, asio::buffer(m_buffer)
  99                         , boost::bind(&http_stream::handshake2, this, _1, h));
 100         }
 101
 102         void http_stream::handshake2(asio::error_code const& e, boost::shared_ptr<handler_type> h)
 103         {
 104                 if (e)
 105                 {
 106                         (*h)(e);
 107                         close();
 108                         return;
 109                 }
 110
 111                 int read_pos = m_buffer.size();
 112                 // look for \n\n and \r\n\r\n
 113                 // both of which means end of http response header
 114                 bool found_end = false;
 115                 if (m_buffer[read_pos - 1] == '\n' && read_pos > 2)
 116                 {
 117                         if (m_buffer[read_pos - 2] == '\n')
 118                         {
 119                                 found_end = true;
 120                         }
 121                         else if (read_pos > 4
 122                                 && m_buffer[read_pos - 2] == '\r'
 123                                 && m_buffer[read_pos - 3] == '\n'
 124                                 && m_buffer[read_pos - 4] == '\r')
 125                         {
 126                                 found_end = true;
 127                         }
 128                 }
 129
 130                 if (found_end)
 131                 {
 132                         m_buffer.push_back(0);
 133                         char* status = strchr(&m_buffer[0], ' ');
 134                         if (status == 0)
 135                         {
 136                                 (*h)(asio::error::operation_not_supported);
 137                                 close();
 138                                 return;
 139                         }
 140
 141                         status++;
 142                         int code = atoi(status);
 143                         if (code != 200)
 144                         {
 145                                 (*h)(asio::error::operation_not_supported);
 146                                 close();
 147                                 return;
 148                         }
 149
 150                         (*h)(e);
 151                         std::vector<char>().swap(m_buffer);
 152                         return;
 153                 }
 154
 155                 // read another byte from the socket
 156                 m_buffer.resize(read_pos + 1);
 157                 asio::async_read(m_sock, asio::buffer(&m_buffer[0] + read_pos, 1)
 158                         , boost::bind(&http_stream::handshake2, this, _1, h));
 159         }
 160
 161 }
 162