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 bool claimed;
  33 static insp::intrusive_list<HttpServerSocket> sockets;
  34
  35 /** HTTP socket states
  36  */
  37 enum HttpState
  38 {
  39         HTTP_SERVE_WAIT_REQUEST = 0, /* Waiting for a full request */
  40         HTTP_SERVE_RECV_POSTDATA = 1, /* Waiting to finish recieving POST data */
  41         HTTP_SERVE_SEND_DATA = 2 /* Sending response */
  42 };
  43
  44 /** A socket used for HTTP transport
  45  */
  46 class HttpServerSocket : public BufferedSocket, public Timer, public insp::intrusive_list_node<HttpServerSocket>
  47 {
  48         HttpState InternalState;
  49         std::string ip;
  50
  51         HTTPHeaders headers;
  52         std::string reqbuffer;
  53         std::string postdata;
  54         unsigned int postsize;
  55         std::string request_type;
  56         std::string uri;
  57         std::string http_version;
  58
  59         /** True if this object is in the cull list
  60          */
  61         bool waitingcull;
  62
  63         bool Tick(time_t currtime) CXX11_OVERRIDE
  64         {
  65                 AddToCull();
  66                 return false;
  67         }
  68
  69  public:
  70         HttpServerSocket(int newfd, const std::string& IP, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server, unsigned int timeoutsec)
  71                 : BufferedSocket(newfd)
  72                 , Timer(timeoutsec)
  73                 , InternalState(HTTP_SERVE_WAIT_REQUEST)
  74                 , ip(IP)
  75                 , postsize(0)
  76                 , waitingcull(false)
  77         {
  78                 ServerInstance->Timers.AddTimer(this);
  79
  80                 if (via->iohookprov)
  81                         via->iohookprov->OnAccept(this, client, server);
  82         }
  83
  84         ~HttpServerSocket()
  85         {
  86                 sockets.erase(this);
  87         }
  88
  89         void OnError(BufferedSocketError) CXX11_OVERRIDE
  90         {
  91                 AddToCull();
  92         }
  93
  94         std::string Response(int response)
  95         {
  96                 switch (response)
  97                 {
  98                         case 100:
  99                                 return "CONTINUE";
 100                         case 101:
 101                                 return "SWITCHING PROTOCOLS";
 102                         case 200:
 103                                 return "OK";
 104                         case 201:
 105                                 return "CREATED";
 106                         case 202:
 107                                 return "ACCEPTED";
 108                         case 203:
 109                                 return "NON-AUTHORITATIVE INFORMATION";
 110                         case 204:
 111                                 return "NO CONTENT";
 112                         case 205:
 113                                 return "RESET CONTENT";
 114                         case 206:
 115                                 return "PARTIAL CONTENT";
 116                         case 300:
 117                                 return "MULTIPLE CHOICES";
 118                         case 301:
 119                                 return "MOVED PERMANENTLY";
 120                         case 302:
 121                                 return "FOUND";
 122                         case 303:
 123                                 return "SEE OTHER";
 124                         case 304:
 125                                 return "NOT MODIFIED";
 126                         case 305:
 127                                 return "USE PROXY";
 128                         case 307:
 129                                 return "TEMPORARY REDIRECT";
 130                         case 400:
 131                                 return "BAD REQUEST";
 132                         case 401:
 133                                 return "UNAUTHORIZED";
 134                         case 402:
 135                                 return "PAYMENT REQUIRED";
 136                         case 403:
 137                                 return "FORBIDDEN";
 138                         case 404:
 139                                 return "NOT FOUND";
 140                         case 405:
 141                                 return "METHOD NOT ALLOWED";
 142                         case 406:
 143                                 return "NOT ACCEPTABLE";
 144                         case 407:
 145                                 return "PROXY AUTHENTICATION REQUIRED";
 146                         case 408:
 147                                 return "REQUEST TIMEOUT";
 148                         case 409:
 149                                 return "CONFLICT";
 150                         case 410:
 151                                 return "GONE";
 152                         case 411:
 153                                 return "LENGTH REQUIRED";
 154                         case 412:
 155                                 return "PRECONDITION FAILED";
 156                         case 413:
 157                                 return "REQUEST ENTITY TOO LARGE";
 158                         case 414:
 159                                 return "REQUEST-URI TOO LONG";
 160                         case 415:
 161                                 return "UNSUPPORTED MEDIA TYPE";
 162                         case 416:
 163                                 return "REQUESTED RANGE NOT SATISFIABLE";
 164                         case 417:
 165                                 return "EXPECTATION FAILED";
 166                         case 500:
 167                                 return "INTERNAL SERVER ERROR";
 168                         case 501:
 169                                 return "NOT IMPLEMENTED";
 170                         case 502:
 171                                 return "BAD GATEWAY";
 172                         case 503:
 173                                 return "SERVICE UNAVAILABLE";
 174                         case 504:
 175                                 return "GATEWAY TIMEOUT";
 176                         case 505:
 177                                 return "HTTP VERSION NOT SUPPORTED";
 178                         default:
 179                                 return "WTF";
 180                         break;
 181
 182                 }
 183         }
 184
 185         void SendHTTPError(int response)
 186         {
 187                 HTTPHeaders empty;
 188                 std::string data = "<html><head></head><body>Server error "+ConvToStr(response)+": "+Response(response)+"<br>"+
 189                                    "<small>Powered by <a href='http://www.inspircd.org'>InspIRCd</a></small></body></html>";
 190
 191                 SendHeaders(data.length(), response, empty);
 192                 WriteData(data);
 193         }
 194
 195         void SendHeaders(unsigned long size, int response, HTTPHeaders &rheaders)
 196         {
 197
 198                 WriteData(http_version + " "+ConvToStr(response)+" "+Response(response)+"\r\n");
 199
 200                 rheaders.CreateHeader("Date", InspIRCd::TimeString(ServerInstance->Time(), "%a, %d %b %Y %H:%M:%S GMT", true));
 201                 rheaders.CreateHeader("Server", INSPIRCD_BRANCH);
 202                 rheaders.SetHeader("Content-Length", ConvToStr(size));
 203
 204                 if (size)
 205                         rheaders.CreateHeader("Content-Type", "text/html");
 206                 else
 207                         rheaders.RemoveHeader("Content-Type");
 208
 209                 /* Supporting Connection: keep-alive causes a whole world of hurt syncronizing timeouts,
 210                  * so remove it, its not essential for what we need.
 211                  */
 212                 rheaders.SetHeader("Connection", "Close");
 213
 214                 WriteData(rheaders.GetFormattedHeaders());
 215                 WriteData("\r\n");
 216         }
 217
 218         void OnDataReady()
 219         {
 220                 if (InternalState == HTTP_SERVE_RECV_POSTDATA)
 221                 {
 222                         postdata.append(recvq);
 223                         if (postdata.length() >= postsize)
 224                                 ServeData();
 225                 }
 226                 else
 227                 {
 228                         reqbuffer.append(recvq);
 229
 230                         if (reqbuffer.length() >= 8192)
 231                         {
 232                                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "m_httpd dropped connection due to an oversized request buffer");
 233                                 reqbuffer.clear();
 234                                 SetError("Buffer");
 235                         }
 236
 237                         if (InternalState == HTTP_SERVE_WAIT_REQUEST)
 238                                 CheckRequestBuffer();
 239                 }
 240         }
 241
 242         void CheckRequestBuffer()
 243         {
 244                 std::string::size_type reqend = reqbuffer.find("\r\n\r\n");
 245                 if (reqend == std::string::npos)
 246                         return;
 247
 248                 // We have the headers; parse them all
 249                 std::string::size_type hbegin = 0, hend;
 250                 while ((hend = reqbuffer.find("\r\n", hbegin)) != std::string::npos)
 251                 {
 252                         if (hbegin == hend)
 253                                 break;
 254
 255                         if (request_type.empty())
 256                         {
 257                                 std::istringstream cheader(std::string(reqbuffer, hbegin, hend - hbegin));
 258                                 cheader >> request_type;
 259                                 cheader >> uri;
 260                                 cheader >> http_version;
 261
 262                                 if (request_type.empty() || uri.empty() || http_version.empty())
 263                                 {
 264                                         SendHTTPError(400);
 265                                         return;
 266                                 }
 267
 268                                 hbegin = hend + 2;
 269                                 continue;
 270                         }
 271
 272                         std::string cheader = reqbuffer.substr(hbegin, hend - hbegin);
 273
 274                         std::string::size_type fieldsep = cheader.find(':');
 275                         if ((fieldsep == std::string::npos) || (fieldsep == 0) || (fieldsep == cheader.length() - 1))
 276                         {
 277                                 SendHTTPError(400);
 278                                 return;
 279                         }
 280
 281                         headers.SetHeader(cheader.substr(0, fieldsep), cheader.substr(fieldsep + 2));
 282
 283                         hbegin = hend + 2;
 284                 }
 285
 286                 reqbuffer.erase(0, reqend + 4);
 287
 288                 std::transform(request_type.begin(), request_type.end(), request_type.begin(), ::toupper);
 289                 std::transform(http_version.begin(), http_version.end(), http_version.begin(), ::toupper);
 290
 291                 if ((http_version != "HTTP/1.1") && (http_version != "HTTP/1.0"))
 292                 {
 293                         SendHTTPError(505);
 294                         return;
 295                 }
 296
 297                 if (headers.IsSet("Content-Length") && (postsize = ConvToInt(headers.GetHeader("Content-Length"))) > 0)
 298                 {
 299                         InternalState = HTTP_SERVE_RECV_POSTDATA;
 300
 301                         if (reqbuffer.length() >= postsize)
 302                         {
 303                                 postdata = reqbuffer.substr(0, postsize);
 304                                 reqbuffer.erase(0, postsize);
 305                         }
 306                         else if (!reqbuffer.empty())
 307                         {
 308                                 postdata = reqbuffer;
 309                                 reqbuffer.clear();
 310                         }
 311
 312                         if (postdata.length() >= postsize)
 313                                 ServeData();
 314
 315                         return;
 316                 }
 317
 318                 ServeData();
 319         }
 320
 321         void ServeData()
 322         {
 323                 InternalState = HTTP_SERVE_SEND_DATA;
 324
 325                 claimed = false;
 326                 HTTPRequest acl((Module*)HttpModule, "httpd_acl", request_type, uri, &headers, this, ip, postdata);
 327                 acl.Send();
 328                 if (!claimed)
 329                 {
 330                         HTTPRequest url((Module*)HttpModule, "httpd_url", request_type, uri, &headers, this, ip, postdata);
 331                         url.Send();
 332                         if (!claimed)
 333                         {
 334                                 SendHTTPError(404);
 335                         }
 336                 }
 337         }
 338
 339         void Page(std::stringstream* n, int response, HTTPHeaders *hheaders)
 340         {
 341                 SendHeaders(n->str().length(), response, *hheaders);
 342                 WriteData(n->str());
 343         }
 344
 345         void AddToCull()
 346         {
 347                 if (waitingcull)
 348                         return;
 349
 350                 waitingcull = true;
 351                 Close();
 352                 ServerInstance->GlobalCulls.AddItem(this);
 353         }
 354 };
 355
 356 class HTTPdAPIImpl : public HTTPdAPIBase
 357 {
 358  public:
 359         HTTPdAPIImpl(Module* parent)
 360                 : HTTPdAPIBase(parent)
 361         {
 362         }
 363
 364         void SendResponse(HTTPDocumentResponse& resp) CXX11_OVERRIDE
 365         {
 366                 claimed = true;
 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
 376  public:
 377         ModuleHttpServer()
 378                 : APIImpl(this)
 379         {
 380         }
 381
 382         void init() CXX11_OVERRIDE
 383         {
 384                 HttpModule = this;
 385         }
 386
 387         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 388         {
 389                 ConfigTag* tag = ServerInstance->Config->ConfValue("httpd");
 390                 timeoutsec = tag->getInt("timeout", 10, 1);
 391         }
 392
 393         ModResult OnAcceptConnection(int nfd, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
 394         {
 395                 if (from->bind_tag->getString("type") != "httpd")
 396                         return MOD_RES_PASSTHRU;
 397                 int port;
 398                 std::string incomingip;
 399                 irc::sockets::satoap(*client, incomingip, port);
 400                 sockets.push_front(new HttpServerSocket(nfd, incomingip, from, client, server, timeoutsec));
 401                 return MOD_RES_ALLOW;
 402         }
 403
 404         CullResult cull() CXX11_OVERRIDE
 405         {
 406                 for (insp::intrusive_list<HttpServerSocket>::const_iterator i = sockets.begin(); i != sockets.end(); ++i)
 407                 {
 408                         HttpServerSocket* sock = *i;
 409                         sock->AddToCull();
 410                 }
 411                 return Module::cull();
 412         }
 413
 414         Version GetVersion() CXX11_OVERRIDE
 415         {
 416                 return Version("Provides HTTP serving facilities to modules", VF_VENDOR);
 417         }
 418 };
 419
 420 MODULE_INIT(ModuleHttpServer)