src/modules/m_httpd.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
   6  *   Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
   7  *   Copyright (C) 2006-2008 Craig Edwards <craigedwards@brainbox.cc>
   8  *   Copyright (C) 2007 John Brooks <john.brooks@dereferenced.net>
   9  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
  10  *
  11  * This file is part of InspIRCd.  InspIRCd is free software: you can
  12  * redistribute it and/or modify it under the terms of the GNU General Public
  13  * License as published by the Free Software Foundation, version 2.
  14  *
  15  * This program is distributed in the hope that it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  17  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24
  25 #include "inspircd.h"
  26 #include "iohook.h"
  27 #include "modules/httpd.h"
  28
  29 /* $ModDep: modules/httpd.h */
  30
  31 class ModuleHttpServer;
  32
  33 static ModuleHttpServer* HttpModule;
  34 static bool claimed;
  35
  36 /** HTTP socket states
  37  */
  38 enum HttpState
  39 {
  40         HTTP_SERVE_WAIT_REQUEST = 0, /* Waiting for a full request */
  41         HTTP_SERVE_RECV_POSTDATA = 1, /* Waiting to finish recieving POST data */
  42         HTTP_SERVE_SEND_DATA = 2 /* Sending response */
  43 };
  44
  45 /** A socket used for HTTP transport
  46  */
  47 class HttpServerSocket : public BufferedSocket
  48 {
  49         HttpState InternalState;
  50         std::string ip;
  51
  52         HTTPHeaders headers;
  53         std::string reqbuffer;
  54         std::string postdata;
  55         unsigned int postsize;
  56         std::string request_type;
  57         std::string uri;
  58         std::string http_version;
  59
  60  public:
  61         HttpServerSocket(int newfd, const std::string& IP, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  62                 : BufferedSocket(newfd), ip(IP), postsize(0)
  63         {
  64                 InternalState = HTTP_SERVE_WAIT_REQUEST;
  65
  66                 FOREACH_MOD(OnHookIO, (this, via));
  67                 if (GetIOHook())
  68                         GetIOHook()->OnStreamSocketAccept(this, client, server);
  69         }
  70
  71         void OnError(BufferedSocketError) CXX11_OVERRIDE
  72         {
  73                 ServerInstance->GlobalCulls.AddItem(this);
  74         }
  75
  76         std::string Response(int response)
  77         {
  78                 switch (response)
  79                 {
  80                         case 100:
  81                                 return "CONTINUE";
  82                         case 101:
  83                                 return "SWITCHING PROTOCOLS";
  84                         case 200:
  85                                 return "OK";
  86                         case 201:
  87                                 return "CREATED";
  88                         case 202:
  89                                 return "ACCEPTED";
  90                         case 203:
  91                                 return "NON-AUTHORITATIVE INFORMATION";
  92                         case 204:
  93                                 return "NO CONTENT";
  94                         case 205:
  95                                 return "RESET CONTENT";
  96                         case 206:
  97                                 return "PARTIAL CONTENT";
  98                         case 300:
  99                                 return "MULTIPLE CHOICES";
 100                         case 301:
 101                                 return "MOVED PERMENANTLY";
 102                         case 302:
 103                                 return "FOUND";
 104                         case 303:
 105                                 return "SEE OTHER";
 106                         case 304:
 107                                 return "NOT MODIFIED";
 108                         case 305:
 109                                 return "USE PROXY";
 110                         case 307:
 111                                 return "TEMPORARY REDIRECT";
 112                         case 400:
 113                                 return "BAD REQUEST";
 114                         case 401:
 115                                 return "UNAUTHORIZED";
 116                         case 402:
 117                                 return "PAYMENT REQUIRED";
 118                         case 403:
 119                                 return "FORBIDDEN";
 120                         case 404:
 121                                 return "NOT FOUND";
 122                         case 405:
 123                                 return "METHOD NOT ALLOWED";
 124                         case 406:
 125                                 return "NOT ACCEPTABLE";
 126                         case 407:
 127                                 return "PROXY AUTHENTICATION REQUIRED";
 128                         case 408:
 129                                 return "REQUEST TIMEOUT";
 130                         case 409:
 131                                 return "CONFLICT";
 132                         case 410:
 133                                 return "GONE";
 134                         case 411:
 135                                 return "LENGTH REQUIRED";
 136                         case 412:
 137                                 return "PRECONDITION FAILED";
 138                         case 413:
 139                                 return "REQUEST ENTITY TOO LARGE";
 140                         case 414:
 141                                 return "REQUEST-URI TOO LONG";
 142                         case 415:
 143                                 return "UNSUPPORTED MEDIA TYPE";
 144                         case 416:
 145                                 return "REQUESTED RANGE NOT SATISFIABLE";
 146                         case 417:
 147                                 return "EXPECTATION FAILED";
 148                         case 500:
 149                                 return "INTERNAL SERVER ERROR";
 150                         case 501:
 151                                 return "NOT IMPLEMENTED";
 152                         case 502:
 153                                 return "BAD GATEWAY";
 154                         case 503:
 155                                 return "SERVICE UNAVAILABLE";
 156                         case 504:
 157                                 return "GATEWAY TIMEOUT";
 158                         case 505:
 159                                 return "HTTP VERSION NOT SUPPORTED";
 160                         default:
 161                                 return "WTF";
 162                         break;
 163
 164                 }
 165         }
 166
 167         void SendHTTPError(int response)
 168         {
 169                 HTTPHeaders empty;
 170                 std::string data = "<html><head></head><body>Server error "+ConvToStr(response)+": "+Response(response)+"<br>"+
 171                                    "<small>Powered by <a href='http://www.inspircd.org'>InspIRCd</a></small></body></html>";
 172
 173                 SendHeaders(data.length(), response, empty);
 174                 WriteData(data);
 175         }
 176
 177         void SendHeaders(unsigned long size, int response, HTTPHeaders &rheaders)
 178         {
 179
 180                 WriteData(http_version + " "+ConvToStr(response)+" "+Response(response)+"\r\n");
 181
 182                 time_t local = ServerInstance->Time();
 183                 struct tm *timeinfo = gmtime(&local);
 184                 char *date = asctime(timeinfo);
 185                 date[strlen(date) - 1] = '\0';
 186                 rheaders.CreateHeader("Date", date);
 187
 188                 rheaders.CreateHeader("Server", BRANCH);
 189                 rheaders.SetHeader("Content-Length", ConvToStr(size));
 190
 191                 if (size)
 192                         rheaders.CreateHeader("Content-Type", "text/html");
 193                 else
 194                         rheaders.RemoveHeader("Content-Type");
 195
 196                 /* Supporting Connection: keep-alive causes a whole world of hurt syncronizing timeouts,
 197                  * so remove it, its not essential for what we need.
 198                  */
 199                 rheaders.SetHeader("Connection", "Close");
 200
 201                 WriteData(rheaders.GetFormattedHeaders());
 202                 WriteData("\r\n");
 203         }
 204
 205         void OnDataReady()
 206         {
 207                 if (InternalState == HTTP_SERVE_RECV_POSTDATA)
 208                 {
 209                         postdata.append(recvq);
 210                         if (postdata.length() >= postsize)
 211                                 ServeData();
 212                 }
 213                 else
 214                 {
 215                         reqbuffer.append(recvq);
 216
 217                         if (reqbuffer.length() >= 8192)
 218                         {
 219                                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "m_httpd dropped connection due to an oversized request buffer");
 220                                 reqbuffer.clear();
 221                                 SetError("Buffer");
 222                         }
 223
 224                         if (InternalState == HTTP_SERVE_WAIT_REQUEST)
 225                                 CheckRequestBuffer();
 226                 }
 227         }
 228
 229         void CheckRequestBuffer()
 230         {
 231                 std::string::size_type reqend = reqbuffer.find("\r\n\r\n");
 232                 if (reqend == std::string::npos)
 233                         return;
 234
 235                 // We have the headers; parse them all
 236                 std::string::size_type hbegin = 0, hend;
 237                 while ((hend = reqbuffer.find("\r\n", hbegin)) != std::string::npos)
 238                 {
 239                         if (hbegin == hend)
 240                                 break;
 241
 242                         if (request_type.empty())
 243                         {
 244                                 std::istringstream cheader(std::string(reqbuffer, hbegin, hend - hbegin));
 245                                 cheader >> request_type;
 246                                 cheader >> uri;
 247                                 cheader >> http_version;
 248
 249                                 if (request_type.empty() || uri.empty() || http_version.empty())
 250                                 {
 251                                         SendHTTPError(400);
 252                                         return;
 253                                 }
 254
 255                                 hbegin = hend + 2;
 256                                 continue;
 257                         }
 258
 259                         std::string cheader = reqbuffer.substr(hbegin, hend - hbegin);
 260
 261                         std::string::size_type fieldsep = cheader.find(':');
 262                         if ((fieldsep == std::string::npos) || (fieldsep == 0) || (fieldsep == cheader.length() - 1))
 263                         {
 264                                 SendHTTPError(400);
 265                                 return;
 266                         }
 267
 268                         headers.SetHeader(cheader.substr(0, fieldsep), cheader.substr(fieldsep + 2));
 269
 270                         hbegin = hend + 2;
 271                 }
 272
 273                 reqbuffer.erase(0, reqend + 4);
 274
 275                 std::transform(request_type.begin(), request_type.end(), request_type.begin(), ::toupper);
 276                 std::transform(http_version.begin(), http_version.end(), http_version.begin(), ::toupper);
 277
 278                 if ((http_version != "HTTP/1.1") && (http_version != "HTTP/1.0"))
 279                 {
 280                         SendHTTPError(505);
 281                         return;
 282                 }
 283
 284                 if (headers.IsSet("Content-Length") && (postsize = ConvToInt(headers.GetHeader("Content-Length"))) > 0)
 285                 {
 286                         InternalState = HTTP_SERVE_RECV_POSTDATA;
 287
 288                         if (reqbuffer.length() >= postsize)
 289                         {
 290                                 postdata = reqbuffer.substr(0, postsize);
 291                                 reqbuffer.erase(0, postsize);
 292                         }
 293                         else if (!reqbuffer.empty())
 294                         {
 295                                 postdata = reqbuffer;
 296                                 reqbuffer.clear();
 297                         }
 298
 299                         if (postdata.length() >= postsize)
 300                                 ServeData();
 301
 302                         return;
 303                 }
 304
 305                 ServeData();
 306         }
 307
 308         void ServeData()
 309         {
 310                 InternalState = HTTP_SERVE_SEND_DATA;
 311
 312                 claimed = false;
 313                 HTTPRequest acl((Module*)HttpModule, "httpd_acl", request_type, uri, &headers, this, ip, postdata);
 314                 acl.Send();
 315                 if (!claimed)
 316                 {
 317                         HTTPRequest url((Module*)HttpModule, "httpd_url", request_type, uri, &headers, this, ip, postdata);
 318                         url.Send();
 319                         if (!claimed)
 320                         {
 321                                 SendHTTPError(404);
 322                         }
 323                 }
 324         }
 325
 326         void Page(std::stringstream* n, int response, HTTPHeaders *hheaders)
 327         {
 328                 SendHeaders(n->str().length(), response, *hheaders);
 329                 WriteData(n->str());
 330         }
 331 };
 332
 333 class HTTPdAPIImpl : public HTTPdAPIBase
 334 {
 335  public:
 336         HTTPdAPIImpl(Module* parent)
 337                 : HTTPdAPIBase(parent)
 338         {
 339         }
 340
 341         void SendResponse(HTTPDocumentResponse& resp) CXX11_OVERRIDE
 342         {
 343                 claimed = true;
 344                 resp.src.sock->Page(resp.document, resp.responsecode, &resp.headers);
 345         }
 346 };
 347
 348 class ModuleHttpServer : public Module
 349 {
 350         std::vector<HttpServerSocket *> httpsocks;
 351         HTTPdAPIImpl APIImpl;
 352
 353  public:
 354         ModuleHttpServer()
 355                 : APIImpl(this)
 356         {
 357         }
 358
 359         void init() CXX11_OVERRIDE
 360         {
 361                 HttpModule = this;
 362                 ServerInstance->Modules->AddService(APIImpl);
 363                 ServerInstance->Modules->Attach(I_OnAcceptConnection, this);
 364         }
 365
 366         ModResult OnAcceptConnection(int nfd, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
 367         {
 368                 if (from->bind_tag->getString("type") != "httpd")
 369                         return MOD_RES_PASSTHRU;
 370                 int port;
 371                 std::string incomingip;
 372                 irc::sockets::satoap(*client, incomingip, port);
 373                 new HttpServerSocket(nfd, incomingip, from, client, server);
 374                 return MOD_RES_ALLOW;
 375         }
 376
 377         ~ModuleHttpServer()
 378         {
 379                 for (size_t i = 0; i < httpsocks.size(); i++)
 380                 {
 381                         httpsocks[i]->cull();
 382                         delete httpsocks[i];
 383                 }
 384         }
 385
 386         Version GetVersion() CXX11_OVERRIDE
 387         {
 388                 return Version("Provides HTTP serving facilities to modules", VF_VENDOR);
 389         }
 390 };
 391
 392 MODULE_INIT(ModuleHttpServer)