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 /** A socket used for HTTP transport
  36  */
  37 class HttpServerSocket : public BufferedSocket
  38 {
  39         FileReader* index;
  40         HttpState InternalState;
  41
  42         HTTPHeaders headers;
  43         std::string reqbuffer;
  44         std::string postdata;
  45         unsigned int postsize;
  46         std::string request_type;
  47         std::string uri;
  48         std::string http_version;
  49         bool keepalive;
  50
  51  public:
  52
  53         HttpServerSocket(InspIRCd* SI, std::string shost, int iport, bool listening, unsigned long maxtime, FileReader* index_page) : BufferedSocket(SI, shost, iport, listening, maxtime), index(index_page), postsize(0)
  54         {
  55                 InternalState = HTTP_LISTEN;
  56         }
  57
  58         HttpServerSocket(InspIRCd* SI, int newfd, char* ip, FileReader* ind) : BufferedSocket(SI, newfd, ip), index(ind), postsize(0), keepalive(false)
  59         {
  60                 InternalState = HTTP_SERVE_WAIT_REQUEST;
  61         }
  62
  63         FileReader* GetIndex()
  64         {
  65                 return index;
  66         }
  67
  68         ~HttpServerSocket()
  69         {
  70         }
  71
  72         virtual int OnIncomingConnection(int newsock, char* ip)
  73         {
  74                 if (InternalState == HTTP_LISTEN)
  75                 {
  76                         new HttpServerSocket(this->Instance, newsock, ip, index);
  77                 }
  78                 return true;
  79         }
  80
  81         virtual void OnClose()
  82         {
  83         }
  84
  85         std::string Response(int response)
  86         {
  87                 switch (response)
  88                 {
  89                         case 100:
  90                                 return "CONTINUE";
  91                         case 101:
  92                                 return "SWITCHING PROTOCOLS";
  93                         case 200:
  94                                 return "OK";
  95                         case 201:
  96                                 return "CREATED";
  97                         case 202:
  98                                 return "ACCEPTED";
  99                         case 203:
 100                                 return "NON-AUTHORITATIVE INFORMATION";
 101                         case 204:
 102                                 return "NO CONTENT";
 103                         case 205:
 104                                 return "RESET CONTENT";
 105                         case 206:
 106                                 return "PARTIAL CONTENT";
 107                         case 300:
 108                                 return "MULTIPLE CHOICES";
 109                         case 301:
 110                                 return "MOVED PERMENANTLY";
 111                         case 302:
 112                                 return "FOUND";
 113                         case 303:
 114                                 return "SEE OTHER";
 115                         case 304:
 116                                 return "NOT MODIFIED";
 117                         case 305:
 118                                 return "USE PROXY";
 119                         case 307:
 120                                 return "TEMPORARY REDIRECT";
 121                         case 400:
 122                                 return "BAD REQUEST";
 123                         case 401:
 124                                 return "UNAUTHORIZED";
 125                         case 402:
 126                                 return "PAYMENT REQUIRED";
 127                         case 403:
 128                                 return "FORBIDDEN";
 129                         case 404:
 130                                 return "NOT FOUND";
 131                         case 405:
 132                                 return "METHOD NOT ALLOWED";
 133                         case 406:
 134                                 return "NOT ACCEPTABLE";
 135                         case 407:
 136                                 return "PROXY AUTHENTICATION REQUIRED";
 137                         case 408:
 138                                 return "REQUEST TIMEOUT";
 139                         case 409:
 140                                 return "CONFLICT";
 141                         case 410:
 142                                 return "GONE";
 143                         case 411:
 144                                 return "LENGTH REQUIRED";
 145                         case 412:
 146                                 return "PRECONDITION FAILED";
 147                         case 413:
 148                                 return "REQUEST ENTITY TOO LARGE";
 149                         case 414:
 150                                 return "REQUEST-URI TOO LONG";
 151                         case 415:
 152                                 return "UNSUPPORTED MEDIA TYPE";
 153                         case 416:
 154                                 return "REQUESTED RANGE NOT SATISFIABLE";
 155                         case 417:
 156                                 return "EXPECTATION FAILED";
 157                         case 500:
 158                                 return "INTERNAL SERVER ERROR";
 159                         case 501:
 160                                 return "NOT IMPLEMENTED";
 161                         case 502:
 162                                 return "BAD GATEWAY";
 163                         case 503:
 164                                 return "SERVICE UNAVAILABLE";
 165                         case 504:
 166                                 return "GATEWAY TIMEOUT";
 167                         case 505:
 168                                 return "HTTP VERSION NOT SUPPORTED";
 169                         default:
 170                                 return "WTF";
 171                         break;
 172
 173                 }
 174         }
 175
 176         void SendHTTPError(int response)
 177         {
 178                 HTTPHeaders empty;
 179                 std::string data = "<html><head></head><body>Server error "+ConvToStr(response)+": "+Response(response)+"<br>"+
 180                                    "<small>Powered by <a href='http://www.inspircd.org'>InspIRCd</a></small></body></html>";
 181
 182                 SendHeaders(data.length(), response, empty);
 183                 this->Write(data);
 184         }
 185
 186         void SendHeaders(unsigned long size, int response, HTTPHeaders &rheaders)
 187         {
 188
 189                 this->Write(http_version + " "+ConvToStr(response)+" "+Response(response)+"\r\n");
 190
 191                 time_t local = this->Instance->Time();
 192                 struct tm *timeinfo = gmtime(&local);
 193                 char *date = asctime(timeinfo);
 194                 date[strlen(date) - 1] = '\0';
 195                 rheaders.CreateHeader("Date", date);
 196
 197                 rheaders.CreateHeader("Server", "InspIRCd/m_httpd.so/1.1");
 198                 rheaders.SetHeader("Content-Length", ConvToStr(size));
 199
 200                 if (size)
 201                         rheaders.CreateHeader("Content-Type", "text/html");
 202                 else
 203                         rheaders.RemoveHeader("Content-Type");
 204
 205                 /* Supporting Connection: keep-alive causes a whole world of hurt syncronizing timeouts,
 206                  * so remove it, its not essential for what we need.
 207                  */
 208                 rheaders.SetHeader("Connection", "Close");
 209
 210                 this->Write(rheaders.GetFormattedHeaders());
 211                 this->Write("\r\n");
 212         }
 213
 214         virtual bool OnDataReady()
 215         {
 216                 const char* data = this->Read();
 217
 218                 /* Check that the data read is a valid pointer and it has some content */
 219                 if (!data || !*data)
 220                         return false;
 221
 222                 if (InternalState == HTTP_SERVE_RECV_POSTDATA)
 223                 {
 224                         postdata.append(data);
 225                         if (postdata.length() >= postsize)
 226                                 ServeData();
 227                 }
 228                 else
 229                 {
 230                         reqbuffer.append(data);
 231
 232                         if (reqbuffer.length() >= 8192)
 233                         {
 234                                 Instance->Logs->Log("m_httpd",DEBUG, "m_httpd dropped connection due to an oversized request buffer");
 235                                 reqbuffer.clear();
 236                                 return false;
 237                         }
 238
 239                         if (InternalState == HTTP_SERVE_WAIT_REQUEST)
 240                                 CheckRequestBuffer();
 241                 }
 242
 243                 return true;
 244         }
 245
 246         void CheckRequestBuffer()
 247         {
 248                 std::string::size_type reqend = reqbuffer.find("\r\n\r\n");
 249                 if (reqend == std::string::npos)
 250                         return;
 251
 252                 // We have the headers; parse them all
 253                 std::string::size_type hbegin = 0, hend;
 254                 while ((hend = reqbuffer.find("\r\n", hbegin)) != std::string::npos)
 255                 {
 256                         if (hbegin == hend)
 257                                 break;
 258
 259                         if (request_type.empty())
 260                         {
 261                                 std::istringstream cheader(std::string(reqbuffer, hbegin, hend - hbegin));
 262                                 cheader >> request_type;
 263                                 cheader >> uri;
 264                                 cheader >> http_version;
 265
 266                                 if (request_type.empty() || uri.empty() || http_version.empty())
 267                                 {
 268                                         SendHTTPError(400);
 269                                         return;
 270                                 }
 271
 272                                 hbegin = hend + 2;
 273                                 continue;
 274                         }
 275
 276                         std::string cheader = reqbuffer.substr(hbegin, hend - hbegin);
 277
 278                         std::string::size_type fieldsep = cheader.find(':');
 279                         if ((fieldsep == std::string::npos) || (fieldsep == 0) || (fieldsep == cheader.length() - 1))
 280                         {
 281                                 SendHTTPError(400);
 282                                 return;
 283                         }
 284
 285                         headers.SetHeader(cheader.substr(0, fieldsep), cheader.substr(fieldsep + 2));
 286
 287                         hbegin = hend + 2;
 288                 }
 289
 290                 reqbuffer.erase(0, reqend + 4);
 291
 292                 std::transform(request_type.begin(), request_type.end(), request_type.begin(), ::toupper);
 293                 std::transform(http_version.begin(), http_version.end(), http_version.begin(), ::toupper);
 294
 295                 if ((http_version != "HTTP/1.1") && (http_version != "HTTP/1.0"))
 296                 {
 297                         SendHTTPError(505);
 298                         return;
 299                 }
 300
 301                 if (strcasecmp(headers.GetHeader("Connection").c_str(), "keep-alive") == 0)
 302                         keepalive = true;
 303
 304                 if (headers.IsSet("Content-Length") && (postsize = atoi(headers.GetHeader("Content-Length").c_str())) != 0)
 305                 {
 306                         InternalState = HTTP_SERVE_RECV_POSTDATA;
 307
 308                         if (reqbuffer.length() >= postsize)
 309                         {
 310                                 postdata = reqbuffer.substr(0, postsize);
 311                                 reqbuffer.erase(0, postsize);
 312                         }
 313                         else if (!reqbuffer.empty())
 314                         {
 315                                 postdata = reqbuffer;
 316                                 reqbuffer.clear();
 317                         }
 318
 319                         if (postdata.length() >= postsize)
 320                                 ServeData();
 321
 322                         return;
 323                 }
 324
 325                 ServeData();
 326         }
 327
 328         void ServeData()
 329         {
 330                 InternalState = HTTP_SERVE_SEND_DATA;
 331
 332                 if ((request_type == "GET") && (uri == "/"))
 333                 {
 334                         HTTPHeaders empty;
 335                         SendHeaders(index->ContentSize(), 200, empty);
 336                         this->Write(index->Contents());
 337                 }
 338                 else
 339                 {
 340                         claimed = false;
 341                         HTTPRequest httpr(request_type,uri,&headers,this,this->GetIP(),postdata);
 342                         Event e((char*)&httpr, (Module*)HttpModule, "httpd_url");
 343                         e.Send(this->Instance);
 344                         if (!claimed)
 345                         {
 346                                 SendHTTPError(404);
 347                         }
 348                 }
 349         }
 350
 351         void Page(std::stringstream* n, int response, HTTPHeaders *hheaders)
 352         {
 353                 SendHeaders(n->str().length(), response, *hheaders);
 354                 this->Write(n->str());
 355                 Instance->SE->DelFd(this);
 356                 this->Close();
 357         }
 358 };
 359
 360 class ModuleHttpServer : public Module
 361 {
 362         std::vector<HttpServerSocket*> httpsocks;
 363  public:
 364
 365         void ReadConfig()
 366         {
 367                 int port;
 368                 std::string host;
 369                 std::string bindip;
 370                 std::string indexfile;
 371                 FileReader* index;
 372                 HttpServerSocket* http;
 373                 ConfigReader c(ServerInstance);
 374
 375                 httpsocks.clear();
 376
 377                 for (int i = 0; i < c.Enumerate("http"); i++)
 378                 {
 379                         host = c.ReadValue("http", "host", i);
 380                         bindip = c.ReadValue("http", "ip", i);
 381                         port = c.ReadInteger("http", "port", i, true);
 382                         indexfile = c.ReadValue("http", "index", i);
 383                         index = new FileReader(ServerInstance, indexfile);
 384                         if (!index->Exists())
 385                                 throw ModuleException("Can't read index file: "+indexfile);
 386                         http = new HttpServerSocket(ServerInstance, bindip, port, true, 0, index);
 387                         httpsocks.push_back(http);
 388                 }
 389         }
 390
 391         ModuleHttpServer(InspIRCd* Me) : Module(Me)
 392         {
 393                 ReadConfig();
 394                 HttpModule = this;
 395                 Implementation eventlist[] = { I_OnRequest };
 396                 ServerInstance->Modules->Attach(eventlist, this, 1);
 397         }
 398
 399         virtual const char* OnRequest(Request* request)
 400         {
 401                 claimed = true;
 402                 HTTPDocument* doc = (HTTPDocument*)request->GetData();
 403                 HttpServerSocket* sock = (HttpServerSocket*)doc->sock;
 404                 sock->Page(doc->GetDocument(), doc->GetResponseCode(), &doc->headers);
 405                 return NULL;
 406         }
 407
 408
 409         virtual ~ModuleHttpServer()
 410         {
 411                 for (size_t i = 0; i < httpsocks.size(); i++)
 412                 {
 413                         ServerInstance->SE->DelFd(httpsocks[i]);
 414                         httpsocks[i]->Close();
 415                         delete httpsocks[i]->GetIndex();
 416                 }
 417                 ServerInstance->BufferedSocketCull();
 418         }
 419
 420         virtual Version GetVersion()
 421         {
 422                 return Version(1,2,0,0,VF_VENDOR|VF_SERVICEPROVIDER,API_VERSION);
 423         }
 424 };
 425
 426 MODULE_INIT(ModuleHttpServer)