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/escape_string.hpp" // for base64encode
  37
  38 namespace libtorrent
  39 {
  40
  41         void http_stream::name_lookup(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                         error_code ec;
  48                         close(ec);
  49                         return;
  50                 }
  51
  52                 m_sock.async_connect(i->endpoint(), boost::bind(
  53                         &http_stream::connected, this, _1, h));
  54         }
  55
  56         void http_stream::connected(error_code const& e, boost::shared_ptr<handler_type> h)
  57         {
  58                 if (e)
  59                 {
  60                         (*h)(e);
  61                         error_code ec;
  62                         close(ec);
  63                         return;
  64                 }
  65
  66                 using namespace libtorrent::detail;
  67
  68                 if (m_no_connect)
  69                 {
  70                         std::vector<char>().swap(m_buffer);
  71                         (*h)(e);
  72                         return;
  73                 }
  74
  75                 // send CONNECT
  76                 std::back_insert_iterator<std::vector<char> > p(m_buffer);
  77                 write_string("CONNECT " + boost::lexical_cast<std::string>(m_remote_endpoint)
  78                         + " HTTP/1.0\r\n", p);
  79                 if (!m_user.empty())
  80                 {
  81                         write_string("Proxy-Authorization: Basic " + base64encode(
  82                                 m_user + ":" + m_password) + "\r\n", p);
  83                 }
  84                 write_string("\r\n", p);
  85                 async_write(m_sock, asio::buffer(m_buffer)
  86                         , boost::bind(&http_stream::handshake1, this, _1, h));
  87         }
  88
  89         void http_stream::handshake1(error_code const& e, boost::shared_ptr<handler_type> h)
  90         {
  91                 if (e)
  92                 {
  93                         (*h)(e);
  94                         error_code ec;
  95                         close(ec);
  96                         return;
  97                 }
  98
  99                 // read one byte from the socket
 100                 m_buffer.resize(1);
 101                 async_read(m_sock, asio::buffer(m_buffer)
 102                         , boost::bind(&http_stream::handshake2, this, _1, h));
 103         }
 104
 105         void http_stream::handshake2(error_code const& e, boost::shared_ptr<handler_type> h)
 106         {
 107                 if (e)
 108                 {
 109                         (*h)(e);
 110                         error_code ec;
 111                         close(ec);
 112                         return;
 113                 }
 114
 115                 int read_pos = m_buffer.size();
 116                 // look for \n\n and \r\n\r\n
 117                 // both of which means end of http response header
 118                 bool found_end = false;
 119                 if (m_buffer[read_pos - 1] == '\n' && read_pos > 2)
 120                 {
 121                         if (m_buffer[read_pos - 2] == '\n')
 122                         {
 123                                 found_end = true;
 124                         }
 125                         else if (read_pos > 4
 126                                 && m_buffer[read_pos - 2] == '\r'
 127                                 && m_buffer[read_pos - 3] == '\n'
 128                                 && m_buffer[read_pos - 4] == '\r')
 129                         {
 130                                 found_end = true;
 131                         }
 132                 }
 133
 134                 if (found_end)
 135                 {
 136                         m_buffer.push_back(0);
 137                         char* status = strchr(&m_buffer[0], ' ');
 138                         if (status == 0)
 139                         {
 140                                 (*h)(asio::error::operation_not_supported);
 141                                 error_code ec;
 142                                 close(ec);
 143                                 return;
 144                         }
 145
 146                         status++;
 147                         int code = atoi(status);
 148                         if (code != 200)
 149                         {
 150                                 (*h)(asio::error::operation_not_supported);
 151                                 error_code ec;
 152                                 close(ec);
 153                                 return;
 154                         }
 155
 156                         (*h)(e);
 157                         std::vector<char>().swap(m_buffer);
 158                         return;
 159                 }
 160
 161                 // read another byte from the socket
 162                 m_buffer.resize(read_pos + 1);
 163                 async_read(m_sock, asio::buffer(&m_buffer[0] + read_pos, 1)
 164                         , boost::bind(&http_stream::handshake2, this, _1, h));
 165         }
 166
 167 }
 168