src/modules/m_httpd.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "httpd.h"
  16
  17 /* $ModDesc: Provides HTTP serving facilities to modules */
  18 /* $ModDep: httpd.h */
  19
  20 class ModuleHttpServer;
  21
  22 static ModuleHttpServer* HttpModule;
  23 static bool claimed;
  24
  25 /** HTTP socket states
  26  */
  27 enum HttpState
  28 {
  29         HTTP_LISTEN = 0,
  30         HTTP_SERVE_WAIT_REQUEST = 1, /* Waiting for a full request */
  31         HTTP_SERVE_RECV_POSTDATA = 2, /* Waiting to finish recieving POST data */
  32         HTTP_SERVE_SEND_DATA = 3 /* Sending response */
  33 };
  34
  35 class HttpServerSocket;
  36
  37 /** This class is used to handle HTTP socket timeouts
  38  */
  39 class HttpServerTimeout : public Timer
  40 {
  41  private:
  42         /** HttpServerSocket we are attached to
  43          */
  44         HttpServerSocket* s;
  45         /** Socketengine the file descriptor is in
  46          */
  47         SocketEngine* SE;
  48  public:
  49         /** Attach timeout to HttpServerSocket
  50          */
  51         HttpServerTimeout(HttpServerSocket* sock, SocketEngine* engine);
  52         /** Handle timer tick
  53          */
  54         void Tick(time_t TIME);
  55 };
  56
  57 /** A socket used for HTTP transport
  58  */
  59 class HttpServerSocket : public BufferedSocket
  60 {
  61         FileReader* index;
  62         HttpState InternalState;
  63
  64         HTTPHeaders headers;
  65         std::string reqbuffer;
  66         std::string postdata;
  67         unsigned int postsize;
  68         std::string request_type;
  69         std::string uri;
  70         std::string http_version;
  71         bool keepalive;
  72
  73         HttpServerTimeout* Timeout;
  74         bool DataSinceLastTick;
  75         friend class HttpServerTimeout;
  76
  77  public:
  78
  79         HttpServerSocket(InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, FileReader* index_page) : BufferedSocket(SI, host, port, listening, maxtime), index(index_page), postsize(0)
  80         {
  81                 InternalState = HTTP_LISTEN;
  82                 Timeout = NULL;
  83         }
  84
  85         HttpServerSocket(InspIRCd* SI, int newfd, char* ip, FileReader* ind) : BufferedSocket(SI, newfd, ip), index(ind), postsize(0), keepalive(false), DataSinceLastTick(false)
  86         {
  87                 InternalState = HTTP_SERVE_WAIT_REQUEST;
  88                 Timeout = new HttpServerTimeout(this, Instance->SE);
  89                 Instance->Timers->AddTimer(Timeout);
  90         }
  91
  92         FileReader* GetIndex()
  93         {
  94                 return index;
  95         }
  96
  97         ~HttpServerSocket()
  98         {
  99                 if (Timeout)
 100                 {
 101                         if (Instance->Time() < Timeout->GetTimer())
 102                                 Instance->Timers->DelTimer(Timeout);
 103                         Timeout = NULL;
 104                 }
 105         }
 106
 107         void ResetRequest()
 108         {
 109                 headers.Clear();
 110                 postdata.clear();
 111                 postsize = 0;
 112                 request_type.clear();
 113                 uri.clear();
 114                 http_version.clear();
 115                 InternalState = HTTP_SERVE_WAIT_REQUEST;
 116
 117                 if (reqbuffer.size())
 118                         CheckRequestBuffer();
 119         }
 120
 121         virtual int OnIncomingConnection(int newsock, char* ip)
 122         {
 123                 if (InternalState == HTTP_LISTEN)
 124                 {
 125                         new HttpServerSocket(this->Instance, newsock, ip, index);
 126                 }
 127                 return true;
 128         }
 129
 130         virtual void OnClose()
 131         {
 132         }
 133
 134         std::string Response(int response)
 135         {
 136                 switch (response)
 137                 {
 138                         case 100:
 139                                 return "CONTINUE";
 140                         case 101:
 141                                 return "SWITCHING PROTOCOLS";
 142                         case 200:
 143                                 return "OK";
 144                         case 201:
 145                                 return "CREATED";
 146                         case 202:
 147                                 return "ACCEPTED";
 148                         case 203:
 149                                 return "NON-AUTHORITATIVE INFORMATION";
 150                         case 204:
 151                                 return "NO CONTENT";
 152                         case 205:
 153                                 return "RESET CONTENT";
 154                         case 206:
 155                                 return "PARTIAL CONTENT";
 156                         case 300:
 157                                 return "MULTIPLE CHOICES";
 158                         case 301:
 159                                 return "MOVED PERMENANTLY";
 160                         case 302:
 161                                 return "FOUND";
 162                         case 303:
 163                                 return "SEE OTHER";
 164                         case 304:
 165                                 return "NOT MODIFIED";
 166                         case 305:
 167                                 return "USE PROXY";
 168                         case 307:
 169                                 return "TEMPORARY REDIRECT";
 170                         case 400:
 171                                 return "BAD REQUEST";
 172                         case 401:
 173                                 return "UNAUTHORIZED";
 174                         case 402:
 175                                 return "PAYMENT REQUIRED";
 176                         case 403:
 177                                 return "FORBIDDEN";
 178                         case 404:
 179                                 return "NOT FOUND";
 180                         case 405:
 181                                 return "METHOD NOT ALLOWED";
 182                         case 406:
 183                                 return "NOT ACCEPTABLE";
 184                         case 407:
 185                                 return "PROXY AUTHENTICATION REQUIRED";
 186                         case 408:
 187                                 return "REQUEST TIMEOUT";
 188                         case 409:
 189                                 return "CONFLICT";
 190                         case 410:
 191                                 return "GONE";
 192                         case 411:
 193                                 return "LENGTH REQUIRED";
 194                         case 412:
 195                                 return "PRECONDITION FAILED";
 196                         case 413:
 197                                 return "REQUEST ENTITY TOO LARGE";
 198                         case 414:
 199                                 return "REQUEST-URI TOO LONG";
 200                         case 415:
 201                                 return "UNSUPPORTED MEDIA TYPE";
 202                         case 416:
 203                                 return "REQUESTED RANGE NOT SATISFIABLE";
 204                         case 417:
 205                                 return "EXPECTATION FAILED";
 206                         case 500:
 207                                 return "INTERNAL SERVER ERROR";
 208                         case 501:
 209                                 return "NOT IMPLEMENTED";
 210                         case 502:
 211                                 return "BAD GATEWAY";
 212                         case 503:
 213                                 return "SERVICE UNAVAILABLE";
 214                         case 504:
 215                                 return "GATEWAY TIMEOUT";
 216                         case 505:
 217                                 return "HTTP VERSION NOT SUPPORTED";
 218                         default:
 219                                 return "WTF";
 220                         break;
 221
 222                 }
 223         }
 224
 225         void SendHTTPError(int response)
 226         {
 227                 HTTPHeaders empty;
 228                 std::string data = "<html><head></head><body>Server error "+ConvToStr(response)+": "+Response(response)+"<br>"+
 229                                    "<small>Powered by <a href='http://www.inspircd.org'>InspIRCd</a></small></body></html>";
 230
 231                 SendHeaders(data.length(), response, empty);
 232                 this->Write(data);
 233
 234                 if (keepalive)
 235                         ResetRequest();
 236         }
 237
 238         void SendHeaders(unsigned long size, int response, HTTPHeaders &rheaders)
 239         {
 240
 241                 this->Write(http_version + " "+ConvToStr(response)+" "+Response(response)+"\r\n");
 242
 243                 time_t local = this->Instance->Time();
 244                 struct tm *timeinfo = gmtime(&local);
 245                 char *date = asctime(timeinfo);
 246                 date[strlen(date) - 1] = '\0';
 247                 rheaders.CreateHeader("Date", date);
 248
 249                 rheaders.CreateHeader("Server", "InspIRCd/m_httpd.so/1.1");
 250                 rheaders.SetHeader("Content-Length", ConvToStr(size));
 251
 252                 if (size)
 253                         rheaders.CreateHeader("Content-Type", "text/html");
 254                 else
 255                         rheaders.RemoveHeader("Content-Type");
 256
 257                 if (rheaders.GetHeader("Connection") == "Close")
 258                         keepalive = false;
 259                 else if (rheaders.GetHeader("Connection") == "Keep-Alive" && !headers.IsSet("Connection"))
 260                         keepalive = true;
 261                 else if (!rheaders.IsSet("Connection") && !keepalive)
 262                         rheaders.SetHeader("Connection", "Close");
 263
 264                 this->Write(rheaders.GetFormattedHeaders());
 265                 this->Write("\r\n");
 266
 267                 if (!size && keepalive)
 268                         ResetRequest();
 269         }
 270
 271         virtual bool OnDataReady()
 272         {
 273                 char* data = this->Read();
 274
 275                 /* Check that the data read is a valid pointer and it has some content */
 276                 if (!data || !*data)
 277                         return false;
 278
 279                 DataSinceLastTick = true;
 280
 281                 if (InternalState == HTTP_SERVE_RECV_POSTDATA)
 282                 {
 283                         postdata.append(data);
 284                         if (postdata.length() >= postsize)
 285                                 ServeData();
 286                 }
 287                 else
 288                 {
 289                         reqbuffer.append(data);
 290
 291                         if (reqbuffer.length() >= 8192)
 292                         {
 293                                 Instance->Log(DEBUG, "m_httpd dropped connection due to an oversized request buffer");
 294                                 reqbuffer.clear();
 295                                 return false;
 296                         }
 297
 298                         if (InternalState == HTTP_SERVE_WAIT_REQUEST)
 299                                 CheckRequestBuffer();
 300                 }
 301
 302                 return true;
 303         }
 304
 305         void CheckRequestBuffer()
 306         {
 307                 std::string::size_type reqend = reqbuffer.find("\r\n\r\n");
 308                 if (reqend == std::string::npos)
 309                         return;
 310
 311                 // We have the headers; parse them all
 312                 std::string::size_type hbegin = 0, hend;
 313                 while ((hend = reqbuffer.find("\r\n", hbegin)) != std::string::npos)
 314                 {
 315                         if (hbegin == hend)
 316                                 break;
 317
 318                         if (request_type.empty())
 319                         {
 320                                 std::istringstream cheader(std::string(reqbuffer, hbegin, hend - hbegin));
 321                                 cheader >> request_type;
 322                                 cheader >> uri;
 323                                 cheader >> http_version;
 324
 325                                 if (request_type.empty() || uri.empty() || http_version.empty())
 326                                 {
 327                                         SendHTTPError(400);
 328                                         return;
 329                                 }
 330
 331                                 hbegin = hend + 2;
 332                                 continue;
 333                         }
 334
 335                         std::string cheader = reqbuffer.substr(hbegin, hend - hbegin);
 336
 337                         std::string::size_type fieldsep = cheader.find(':');
 338                         if ((fieldsep == std::string::npos) || (fieldsep == 0) || (fieldsep == cheader.length() - 1))
 339                         {
 340                                 SendHTTPError(400);
 341                                 return;
 342                         }
 343
 344                         headers.SetHeader(cheader.substr(0, fieldsep), cheader.substr(fieldsep + 2));
 345
 346                         hbegin = hend + 2;
 347                 }
 348
 349                 reqbuffer.erase(0, reqend + 4);
 350
 351                 std::transform(request_type.begin(), request_type.end(), request_type.begin(), ::toupper);
 352                 std::transform(http_version.begin(), http_version.end(), http_version.begin(), ::toupper);
 353
 354                 if ((http_version != "HTTP/1.1") && (http_version != "HTTP/1.0"))
 355                 {
 356                         SendHTTPError(505);
 357                         return;
 358                 }
 359
 360                 if (strcasecmp(headers.GetHeader("Connection").c_str(), "keep-alive") == 0)
 361                         keepalive = true;
 362
 363                 if (headers.IsSet("Content-Length") && (postsize = atoi(headers.GetHeader("Content-Length").c_str())) != 0)
 364                 {
 365                         InternalState = HTTP_SERVE_RECV_POSTDATA;
 366
 367                         if (reqbuffer.length() >= postsize)
 368                         {
 369                                 postdata = reqbuffer.substr(0, postsize);
 370                                 reqbuffer.erase(0, postsize);
 371                         }
 372                         else if (!reqbuffer.empty())
 373                         {
 374                                 postdata = reqbuffer;
 375                                 reqbuffer.clear();
 376                         }
 377
 378                         if (postdata.length() >= postsize)
 379                                 ServeData();
 380
 381                         return;
 382                 }
 383
 384                 ServeData();
 385         }
 386
 387         void ServeData()
 388         {
 389                 InternalState = HTTP_SERVE_SEND_DATA;
 390
 391                 if ((request_type == "GET") && (uri == "/"))
 392                 {
 393                         HTTPHeaders empty;
 394                         SendHeaders(index->ContentSize(), 200, empty);
 395                         this->Write(index->Contents());
 396                 }
 397                 else
 398                 {
 399                         claimed = false;
 400                         HTTPRequest httpr(request_type,uri,&headers,this,this->GetIP(),postdata);
 401                         Event e((char*)&httpr, (Module*)HttpModule, "httpd_url");
 402                         e.Send(this->Instance);
 403                         if (!claimed)
 404                         {
 405                                 SendHTTPError(404);
 406                         }
 407                 }
 408         }
 409
 410         void Page(std::stringstream* n, int response, HTTPHeaders *headers)
 411         {
 412                 SendHeaders(n->str().length(), response, *headers);
 413                 this->Write(n->str());
 414
 415                 if (!keepalive)
 416                 {
 417                         Instance->SE->DelFd(this);
 418                         this->Close();
 419                 }
 420                 else
 421                         this->ResetRequest();
 422         }
 423 };
 424
 425 HttpServerTimeout::HttpServerTimeout(HttpServerSocket* sock, SocketEngine* engine) : Timer(15, time(NULL), true), s(sock), SE(engine)
 426 {
 427 }
 428
 429 void HttpServerTimeout::Tick(time_t TIME)
 430 {
 431         if (!s->DataSinceLastTick)
 432         {
 433                 SE->DelFd(s);
 434                 s->Close();
 435                 s->Timeout = NULL;
 436                 this->CancelRepeat();
 437         }
 438         else
 439                 s->DataSinceLastTick = false;
 440 }
 441
 442 class ModuleHttpServer : public Module
 443 {
 444         std::vector<HttpServerSocket*> httpsocks;
 445  public:
 446
 447         void ReadConfig()
 448         {
 449                 int port;
 450                 std::string host;
 451                 std::string bindip;
 452                 std::string indexfile;
 453                 FileReader* index;
 454                 HttpServerSocket* http;
 455                 ConfigReader c(ServerInstance);
 456
 457                 httpsocks.clear();
 458
 459                 for (int i = 0; i < c.Enumerate("http"); i++)
 460                 {
 461                         host = c.ReadValue("http", "host", i);
 462                         bindip = c.ReadValue("http", "ip", i);
 463                         port = c.ReadInteger("http", "port", i, true);
 464                         indexfile = c.ReadValue("http", "index", i);
 465                         index = new FileReader(ServerInstance, indexfile);
 466                         if (!index->Exists())
 467                                 throw ModuleException("Can't read index file: "+indexfile);
 468                         http = new HttpServerSocket(ServerInstance, bindip, port, true, 0, index);
 469                         httpsocks.push_back(http);
 470                 }
 471         }
 472
 473         ModuleHttpServer(InspIRCd* Me) : Module(Me)
 474         {
 475                 ReadConfig();
 476                 HttpModule = this;
 477                 Implementation eventlist[] = { I_OnRequest };
 478                 ServerInstance->Modules->Attach(eventlist, this, 1);
 479         }
 480
 481         char* OnRequest(Request* request)
 482         {
 483                 claimed = true;
 484                 HTTPDocument* doc = (HTTPDocument*)request->GetData();
 485                 HttpServerSocket* sock = (HttpServerSocket*)doc->sock;
 486                 sock->Page(doc->GetDocument(), doc->GetResponseCode(), &doc->headers);
 487                 return NULL;
 488         }
 489
 490
 491         virtual ~ModuleHttpServer()
 492         {
 493                 for (size_t i = 0; i < httpsocks.size(); i++)
 494                 {
 495                         ServerInstance->SE->DelFd(httpsocks[i]);
 496                         httpsocks[i]->Close();
 497                         delete httpsocks[i]->GetIndex();
 498                 }
 499                 ServerInstance->BufferedSocketCull();
 500         }
 501
 502         virtual Version GetVersion()
 503         {
 504                 return Version(1,1,0,0,VF_VENDOR|VF_SERVICEPROVIDER,API_VERSION);
 505         }
 506 };
 507
 508 MODULE_INIT(ModuleHttpServer)