ceph/src/boost/libs/asio/example/cpp11/http/server/request_parser.cpp

   1 //
   2 // request_parser.cpp
   3 // ~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #include "request_parser.hpp"
  12 #include "request.hpp"
  13
  14 namespace http {
  15 namespace server {
  16
  17 request_parser::request_parser()
  18   : state_(method_start)
  19 {
  20 }
  21
  22 void request_parser::reset()
  23 {
  24   state_ = method_start;
  25 }
  26
  27 request_parser::result_type request_parser::consume(request& req, char input)
  28 {
  29   switch (state_)
  30   {
  31   case method_start:
  32     if (!is_char(input) || is_ctl(input) || is_tspecial(input))
  33     {
  34       return bad;
  35     }
  36     else
  37     {
  38       state_ = method;
  39       req.method.push_back(input);
  40       return indeterminate;
  41     }
  42   case method:
  43     if (input == ' ')
  44     {
  45       state_ = uri;
  46       return indeterminate;
  47     }
  48     else if (!is_char(input) || is_ctl(input) || is_tspecial(input))
  49     {
  50       return bad;
  51     }
  52     else
  53     {
  54       req.method.push_back(input);
  55       return indeterminate;
  56     }
  57   case uri:
  58     if (input == ' ')
  59     {
  60       state_ = http_version_h;
  61       return indeterminate;
  62     }
  63     else if (is_ctl(input))
  64     {
  65       return bad;
  66     }
  67     else
  68     {
  69       req.uri.push_back(input);
  70       return indeterminate;
  71     }
  72   case http_version_h:
  73     if (input == 'H')
  74     {
  75       state_ = http_version_t_1;
  76       return indeterminate;
  77     }
  78     else
  79     {
  80       return bad;
  81     }
  82   case http_version_t_1:
  83     if (input == 'T')
  84     {
  85       state_ = http_version_t_2;
  86       return indeterminate;
  87     }
  88     else
  89     {
  90       return bad;
  91     }
  92   case http_version_t_2:
  93     if (input == 'T')
  94     {
  95       state_ = http_version_p;
  96       return indeterminate;
  97     }
  98     else
  99     {
 100       return bad;
 101     }
 102   case http_version_p:
 103     if (input == 'P')
 104     {
 105       state_ = http_version_slash;
 106       return indeterminate;
 107     }
 108     else
 109     {
 110       return bad;
 111     }
 112   case http_version_slash:
 113     if (input == '/')
 114     {
 115       req.http_version_major = 0;
 116       req.http_version_minor = 0;
 117       state_ = http_version_major_start;
 118       return indeterminate;
 119     }
 120     else
 121     {
 122       return bad;
 123     }
 124   case http_version_major_start:
 125     if (is_digit(input))
 126     {
 127       req.http_version_major = req.http_version_major * 10 + input - '0';
 128       state_ = http_version_major;
 129       return indeterminate;
 130     }
 131     else
 132     {
 133       return bad;
 134     }
 135   case http_version_major:
 136     if (input == '.')
 137     {
 138       state_ = http_version_minor_start;
 139       return indeterminate;
 140     }
 141     else if (is_digit(input))
 142     {
 143       req.http_version_major = req.http_version_major * 10 + input - '0';
 144       return indeterminate;
 145     }
 146     else
 147     {
 148       return bad;
 149     }
 150   case http_version_minor_start:
 151     if (is_digit(input))
 152     {
 153       req.http_version_minor = req.http_version_minor * 10 + input - '0';
 154       state_ = http_version_minor;
 155       return indeterminate;
 156     }
 157     else
 158     {
 159       return bad;
 160     }
 161   case http_version_minor:
 162     if (input == '\r')
 163     {
 164       state_ = expecting_newline_1;
 165       return indeterminate;
 166     }
 167     else if (is_digit(input))
 168     {
 169       req.http_version_minor = req.http_version_minor * 10 + input - '0';
 170       return indeterminate;
 171     }
 172     else
 173     {
 174       return bad;
 175     }
 176   case expecting_newline_1:
 177     if (input == '\n')
 178     {
 179       state_ = header_line_start;
 180       return indeterminate;
 181     }
 182     else
 183     {
 184       return bad;
 185     }
 186   case header_line_start:
 187     if (input == '\r')
 188     {
 189       state_ = expecting_newline_3;
 190       return indeterminate;
 191     }
 192     else if (!req.headers.empty() && (input == ' ' || input == '\t'))
 193     {
 194       state_ = header_lws;
 195       return indeterminate;
 196     }
 197     else if (!is_char(input) || is_ctl(input) || is_tspecial(input))
 198     {
 199       return bad;
 200     }
 201     else
 202     {
 203       req.headers.push_back(header());
 204       req.headers.back().name.push_back(input);
 205       state_ = header_name;
 206       return indeterminate;
 207     }
 208   case header_lws:
 209     if (input == '\r')
 210     {
 211       state_ = expecting_newline_2;
 212       return indeterminate;
 213     }
 214     else if (input == ' ' || input == '\t')
 215     {
 216       return indeterminate;
 217     }
 218     else if (is_ctl(input))
 219     {
 220       return bad;
 221     }
 222     else
 223     {
 224       state_ = header_value;
 225       req.headers.back().value.push_back(input);
 226       return indeterminate;
 227     }
 228   case header_name:
 229     if (input == ':')
 230     {
 231       state_ = space_before_header_value;
 232       return indeterminate;
 233     }
 234     else if (!is_char(input) || is_ctl(input) || is_tspecial(input))
 235     {
 236       return bad;
 237     }
 238     else
 239     {
 240       req.headers.back().name.push_back(input);
 241       return indeterminate;
 242     }
 243   case space_before_header_value:
 244     if (input == ' ')
 245     {
 246       state_ = header_value;
 247       return indeterminate;
 248     }
 249     else
 250     {
 251       return bad;
 252     }
 253   case header_value:
 254     if (input == '\r')
 255     {
 256       state_ = expecting_newline_2;
 257       return indeterminate;
 258     }
 259     else if (is_ctl(input))
 260     {
 261       return bad;
 262     }
 263     else
 264     {
 265       req.headers.back().value.push_back(input);
 266       return indeterminate;
 267     }
 268   case expecting_newline_2:
 269     if (input == '\n')
 270     {
 271       state_ = header_line_start;
 272       return indeterminate;
 273     }
 274     else
 275     {
 276       return bad;
 277     }
 278   case expecting_newline_3:
 279     return (input == '\n') ? good : bad;
 280   default:
 281     return bad;
 282   }
 283 }
 284
 285 bool request_parser::is_char(int c)
 286 {
 287   return c >= 0 && c <= 127;
 288 }
 289
 290 bool request_parser::is_ctl(int c)
 291 {
 292   return (c >= 0 && c <= 31) || (c == 127);
 293 }
 294
 295 bool request_parser::is_tspecial(int c)
 296 {
 297   switch (c)
 298   {
 299   case '(': case ')': case '<': case '>': case '@':
 300   case ',': case ';': case ':': case '\\': case '"':
 301   case '/': case '[': case ']': case '?': case '=':
 302   case '{': case '}': case ' ': case '\t':
 303     return true;
 304   default:
 305     return false;
 306   }
 307 }
 308
 309 bool request_parser::is_digit(int c)
 310 {
 311   return c >= '0' && c <= '9';
 312 }
 313
 314 } // namespace server
 315 } // namespace http