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 class ModuleHttpServer;
  30
  31 static ModuleHttpServer* HttpModule;
  32 static insp::intrusive_list<HttpServerSocket> sockets;
  33 static Events::ModuleEventProvider* aclevprov;
  34 static Events::ModuleEventProvider* reqevprov;
  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, public Timer, public insp::intrusive_list_node<HttpServerSocket>
  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         /** True if this object is in the cull list
  61          */
  62         bool waitingcull;
  63
  64         bool Tick(time_t currtime) CXX11_OVERRIDE
  65         {
  66                 AddToCull();
  67                 return false;
  68         }
  69
  70  public:
  71         HttpServerSocket(int newfd, const std::string& IP, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server, unsigned int timeoutsec)
  72                 : BufferedSocket(newfd)
  73                 , Timer(timeoutsec)
  74                 , InternalState(HTTP_SERVE_WAIT_REQUEST)
  75                 , ip(IP)
  76                 , postsize(0)
  77                 , waitingcull(false)
  78         {
  79                 ServerInstance->Timers.AddTimer(this);
  80
  81                 if ((!via->iohookprovs.empty()) && (via->iohookprovs.back()))
  82                         via->iohookprovs.back()->OnAccept(this, client, server);
  83         }
  84
  85         ~HttpServerSocket()
  86         {
  87                 sockets.erase(this);
  88         }
  89
  90         void OnError(BufferedSocketError) CXX11_OVERRIDE
  91         {
  92                 AddToCull();
  93         }
  94
  95         std::string Response(int response)
  96         {
  97                 switch (response)
  98                 {
  99                         case 100:
 100                                 return "CONTINUE";
 101                         case 101:
 102                                 return "SWITCHING PROTOCOLS";
 103                         case 200:
 104                                 return "OK";
 105                         case 201:
 106                                 return "CREATED";
 107                         case 202:
 108                                 return "ACCEPTED";
 109                         case 203:
 110                                 return "NON-AUTHORITATIVE INFORMATION";
 111                         case 204:
 112                                 return "NO CONTENT";
 113                         case 205:
 114                                 return "RESET CONTENT";
 115                         case 206:
 116                                 return "PARTIAL CONTENT";
 117                         case 300:
 118                                 return "MULTIPLE CHOICES";
 119                         case 301:
 120                                 return "MOVED PERMANENTLY";
 121                         case 302:
 122                                 return "FOUND";
 123                         case 303:
 124                                 return "SEE OTHER";
 125                         case 304:
 126                                 return "NOT MODIFIED";
 127                         case 305:
 128                                 return "USE PROXY";
 129                         case 307:
 130                                 return "TEMPORARY REDIRECT";
 131                         case 400:
 132                                 return "BAD REQUEST";
 133                         case 401:
 134                                 return "UNAUTHORIZED";
 135                         case 402:
 136                                 return "PAYMENT REQUIRED";
 137                         case 403:
 138                                 return "FORBIDDEN";
 139                         case 404:
 140                                 return "NOT FOUND";
 141                         case 405:
 142                                 return "METHOD NOT ALLOWED";
 143                         case 406:
 144                                 return "NOT ACCEPTABLE";
 145                         case 407:
 146                                 return "PROXY AUTHENTICATION REQUIRED";
 147                         case 408:
 148                                 return "REQUEST TIMEOUT";
 149                         case 409:
 150                                 return "CONFLICT";
 151                         case 410:
 152                                 return "GONE";
 153                         case 411:
 154                                 return "LENGTH REQUIRED";
 155                         case 412:
 156                                 return "PRECONDITION FAILED";
 157                         case 413:
 158                                 return "REQUEST ENTITY TOO LARGE";
 159                         case 414:
 160                                 return "REQUEST-URI TOO LONG";
 161                         case 415:
 162                                 return "UNSUPPORTED MEDIA TYPE";
 163                         case 416:
 164                                 return "REQUESTED RANGE NOT SATISFIABLE";
 165                         case 417:
 166                                 return "EXPECTATION FAILED";
 167                         case 500:
 168                                 return "INTERNAL SERVER ERROR";
 169                         case 501:
 170                                 return "NOT IMPLEMENTED";
 171                         case 502:
 172                                 return "BAD GATEWAY";
 173                         case 503:
 174                                 return "SERVICE UNAVAILABLE";
 175                         case 504:
 176                                 return "GATEWAY TIMEOUT";
 177                         case 505:
 178                                 return "HTTP VERSION NOT SUPPORTED";
 179                         default:
 180                                 return "WTF";
 181                         break;
 182
 183                 }
 184         }
 185
 186         void SendHTTPError(int response)
 187         {
 188                 HTTPHeaders empty;
 189                 std::string data = "<html><head></head><body>Server error "+ConvToStr(response)+": "+Response(response)+"<br>"+
 190                                    "<small>Powered by <a href='http://www.inspircd.org'>InspIRCd</a></small></body></html>";
 191
 192                 SendHeaders(data.length(), response, empty);
 193                 WriteData(data);
 194         }
 195
 196         void SendHeaders(unsigned long size, int response, HTTPHeaders &rheaders)
 197         {
 198
 199                 WriteData(http_version + " "+ConvToStr(response)+" "+Response(response)+"\r\n");
 200
 201                 rheaders.CreateHeader("Date", InspIRCd::TimeString(ServerInstance->Time(), "%a, %d %b %Y %H:%M:%S GMT", true));
 202                 rheaders.CreateHeader("Server", INSPIRCD_BRANCH);
 203                 rheaders.SetHeader("Content-Length", ConvToStr(size));
 204
 205                 if (size)
 206                         rheaders.CreateHeader("Content-Type", "text/html");
 207                 else
 208                         rheaders.RemoveHeader("Content-Type");
 209
 210                 /* Supporting Connection: keep-alive causes a whole world of hurt syncronizing timeouts,
 211                  * so remove it, its not essential for what we need.
 212                  */
 213                 rheaders.SetHeader("Connection", "Close");
 214
 215                 WriteData(rheaders.GetFormattedHeaders());
 216                 WriteData("\r\n");
 217         }
 218
 219         void OnDataReady()
 220         {
 221                 if (InternalState == HTTP_SERVE_RECV_POSTDATA)
 222                 {
 223                         postdata.append(recvq);
 224                         if (postdata.length() >= postsize)
 225                                 ServeData();
 226                 }
 227                 else
 228                 {
 229                         reqbuffer.append(recvq);
 230
 231                         if (reqbuffer.length() >= 8192)
 232                         {
 233                                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "m_httpd dropped connection due to an oversized request buffer");
 234                                 reqbuffer.clear();
 235                                 SetError("Buffer");
 236                         }
 237
 238                         if (InternalState == HTTP_SERVE_WAIT_REQUEST)
 239                                 CheckRequestBuffer();
 240                 }
 241         }
 242
 243         void CheckRequestBuffer()
 244         {
 245                 std::string::size_type reqend = reqbuffer.find("\r\n\r\n");
 246                 if (reqend == std::string::npos)
 247                         return;
 248
 249                 // We have the headers; parse them all
 250                 std::string::size_type hbegin = 0, hend;
 251                 while ((hend = reqbuffer.find("\r\n", hbegin)) != std::string::npos)
 252                 {
 253                         if (hbegin == hend)
 254                                 break;
 255
 256                         if (request_type.empty())
 257                         {
 258                                 std::istringstream cheader(std::string(reqbuffer, hbegin, hend - hbegin));
 259                                 cheader >> request_type;
 260                                 cheader >> uri;
 261                                 cheader >> http_version;
 262
 263                                 if (request_type.empty() || uri.empty() || http_version.empty())
 264                                 {
 265                                         SendHTTPError(400);
 266                                         return;
 267                                 }
 268
 269                                 hbegin = hend + 2;
 270                                 continue;
 271                         }
 272
 273                         std::string cheader(reqbuffer, hbegin, hend - hbegin);
 274
 275                         std::string::size_type fieldsep = cheader.find(':');
 276                         if ((fieldsep == std::string::npos) || (fieldsep == 0) || (fieldsep == cheader.length() - 1))
 277                         {
 278                                 SendHTTPError(400);
 279                                 return;
 280                         }
 281
 282                         headers.SetHeader(cheader.substr(0, fieldsep), cheader.substr(fieldsep + 2));
 283
 284                         hbegin = hend + 2;
 285                 }
 286
 287                 reqbuffer.erase(0, reqend + 4);
 288
 289                 std::transform(request_type.begin(), request_type.end(), request_type.begin(), ::toupper);
 290                 std::transform(http_version.begin(), http_version.end(), http_version.begin(), ::toupper);
 291
 292                 if ((http_version != "HTTP/1.1") && (http_version != "HTTP/1.0"))
 293                 {
 294                         SendHTTPError(505);
 295                         return;
 296                 }
 297
 298                 if (headers.IsSet("Content-Length") && (postsize = ConvToInt(headers.GetHeader("Content-Length"))) > 0)
 299                 {
 300                         InternalState = HTTP_SERVE_RECV_POSTDATA;
 301
 302                         if (reqbuffer.length() >= postsize)
 303                         {
 304                                 postdata.assign(reqbuffer, 0, postsize);
 305                                 reqbuffer.erase(0, postsize);
 306                         }
 307                         else if (!reqbuffer.empty())
 308                         {
 309                                 postdata = reqbuffer;
 310                                 reqbuffer.clear();
 311                         }
 312
 313                         if (postdata.length() >= postsize)
 314                                 ServeData();
 315
 316                         return;
 317                 }
 318
 319                 ServeData();
 320         }
 321
 322         void ServeData()
 323         {
 324                 InternalState = HTTP_SERVE_SEND_DATA;
 325
 326                 ModResult MOD_RESULT;
 327                 HTTPRequest acl(request_type, uri, &headers, this, ip, postdata);
 328                 FIRST_MOD_RESULT_CUSTOM(*aclevprov, HTTPACLEventListener, OnHTTPACLCheck, MOD_RESULT, (acl));
 329                 if (MOD_RESULT != MOD_RES_DENY)
 330                 {
 331                         HTTPRequest url(request_type, uri, &headers, this, ip, postdata);
 332                         FIRST_MOD_RESULT_CUSTOM(*reqevprov, HTTPRequestEventListener, OnHTTPRequest, MOD_RESULT, (url));
 333                         if (MOD_RESULT == MOD_RES_PASSTHRU)
 334                         {
 335                                 SendHTTPError(404);
 336                         }
 337                 }
 338         }
 339
 340         void Page(std::stringstream* n, int response, HTTPHeaders *hheaders)
 341         {
 342                 SendHeaders(n->str().length(), response, *hheaders);
 343                 WriteData(n->str());
 344         }
 345
 346         void AddToCull()
 347         {
 348                 if (waitingcull)
 349                         return;
 350
 351                 waitingcull = true;
 352                 Close();
 353                 ServerInstance->GlobalCulls.AddItem(this);
 354         }
 355 };
 356
 357 class HTTPdAPIImpl : public HTTPdAPIBase
 358 {
 359  public:
 360         HTTPdAPIImpl(Module* parent)
 361                 : HTTPdAPIBase(parent)
 362         {
 363         }
 364
 365         void SendResponse(HTTPDocumentResponse& resp) CXX11_OVERRIDE
 366         {
 367                 resp.src.sock->Page(resp.document, resp.responsecode, &resp.headers);
 368         }
 369 };
 370
 371 class ModuleHttpServer : public Module
 372 {
 373         HTTPdAPIImpl APIImpl;
 374         unsigned int timeoutsec;
 375         Events::ModuleEventProvider acleventprov;
 376         Events::ModuleEventProvider reqeventprov;
 377
 378  public:
 379         ModuleHttpServer()
 380                 : APIImpl(this)
 381                 , acleventprov(this, "event/http-acl")
 382                 , reqeventprov(this, "event/http-request")
 383         {
 384                 aclevprov = &acleventprov;
 385                 reqevprov = &reqeventprov;
 386         }
 387
 388         void init() CXX11_OVERRIDE
 389         {
 390                 HttpModule = this;
 391         }
 392
 393         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 394         {
 395                 ConfigTag* tag = ServerInstance->Config->ConfValue("httpd");
 396                 timeoutsec = tag->getInt("timeout", 10, 1);
 397         }
 398
 399         ModResult OnAcceptConnection(int nfd, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
 400         {
 401                 if (from->bind_tag->getString("type") != "httpd")
 402                         return MOD_RES_PASSTHRU;
 403                 int port;
 404                 std::string incomingip;
 405                 irc::sockets::satoap(*client, incomingip, port);
 406                 sockets.push_front(new HttpServerSocket(nfd, incomingip, from, client, server, timeoutsec));
 407                 return MOD_RES_ALLOW;
 408         }
 409
 410         void OnUnloadModule(Module* mod)
 411         {
 412                 for (insp::intrusive_list<HttpServerSocket>::const_iterator i = sockets.begin(); i != sockets.end(); )
 413                 {
 414                         HttpServerSocket* sock = *i;
 415                         ++i;
 416                         if (sock->GetModHook(mod))
 417                         {
 418                                 sock->cull();
 419                                 delete sock;
 420                         }
 421                 }
 422         }
 423
 424         CullResult cull() CXX11_OVERRIDE
 425         {
 426                 for (insp::intrusive_list<HttpServerSocket>::const_iterator i = sockets.begin(); i != sockets.end(); ++i)
 427                 {
 428                         HttpServerSocket* sock = *i;
 429                         sock->AddToCull();
 430                 }
 431                 return Module::cull();
 432         }
 433
 434         Version GetVersion() CXX11_OVERRIDE
 435         {
 436                 return Version("Provides HTTP serving facilities to modules", VF_VENDOR);
 437         }
 438 };
 439
 440 MODULE_INIT(ModuleHttpServer)