src/modules/m_httpd.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/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_SERVE_WAIT_REQUEST = 0, /* Waiting for a full request */
  30         HTTP_SERVE_RECV_POSTDATA = 1, /* Waiting to finish recieving POST data */
  31         HTTP_SERVE_SEND_DATA = 2 /* Sending response */
  32 };
  33
  34 /** A socket used for HTTP transport
  35  */
  36 class HttpServerSocket : public BufferedSocket
  37 {
  38         FileReader* index;
  39         HttpState InternalState;
  40         std::string ip;
  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
  50  public:
  51
  52         HttpServerSocket(int newfd, const char* IP, FileReader* ind)
  53                 : BufferedSocket(newfd), index(ind), ip(IP), postsize(0)
  54         {
  55                 InternalState = HTTP_SERVE_WAIT_REQUEST;
  56         }
  57
  58         FileReader* GetIndex()
  59         {
  60                 return index;
  61         }
  62
  63         ~HttpServerSocket()
  64         {
  65         }
  66
  67         virtual void OnError(BufferedSocketError)
  68         {
  69         }
  70
  71         std::string Response(int response)
  72         {
  73                 switch (response)
  74                 {
  75                         case 100:
  76                                 return "CONTINUE";
  77                         case 101:
  78                                 return "SWITCHING PROTOCOLS";
  79                         case 200:
  80                                 return "OK";
  81                         case 201:
  82                                 return "CREATED";
  83                         case 202:
  84                                 return "ACCEPTED";
  85                         case 203:
  86                                 return "NON-AUTHORITATIVE INFORMATION";
  87                         case 204:
  88                                 return "NO CONTENT";
  89                         case 205:
  90                                 return "RESET CONTENT";
  91                         case 206:
  92                                 return "PARTIAL CONTENT";
  93                         case 300:
  94                                 return "MULTIPLE CHOICES";
  95                         case 301:
  96                                 return "MOVED PERMENANTLY";
  97                         case 302:
  98                                 return "FOUND";
  99                         case 303:
 100                                 return "SEE OTHER";
 101                         case 304:
 102                                 return "NOT MODIFIED";
 103                         case 305:
 104                                 return "USE PROXY";
 105                         case 307:
 106                                 return "TEMPORARY REDIRECT";
 107                         case 400:
 108                                 return "BAD REQUEST";
 109                         case 401:
 110                                 return "UNAUTHORIZED";
 111                         case 402:
 112                                 return "PAYMENT REQUIRED";
 113                         case 403:
 114                                 return "FORBIDDEN";
 115                         case 404:
 116                                 return "NOT FOUND";
 117                         case 405:
 118                                 return "METHOD NOT ALLOWED";
 119                         case 406:
 120                                 return "NOT ACCEPTABLE";
 121                         case 407:
 122                                 return "PROXY AUTHENTICATION REQUIRED";
 123                         case 408:
 124                                 return "REQUEST TIMEOUT";
 125                         case 409:
 126                                 return "CONFLICT";
 127                         case 410:
 128                                 return "GONE";
 129                         case 411:
 130                                 return "LENGTH REQUIRED";
 131                         case 412:
 132                                 return "PRECONDITION FAILED";
 133                         case 413:
 134                                 return "REQUEST ENTITY TOO LARGE";
 135                         case 414:
 136                                 return "REQUEST-URI TOO LONG";
 137                         case 415:
 138                                 return "UNSUPPORTED MEDIA TYPE";
 139                         case 416:
 140                                 return "REQUESTED RANGE NOT SATISFIABLE";
 141                         case 417:
 142                                 return "EXPECTATION FAILED";
 143                         case 500:
 144                                 return "INTERNAL SERVER ERROR";
 145                         case 501:
 146                                 return "NOT IMPLEMENTED";
 147                         case 502:
 148                                 return "BAD GATEWAY";
 149                         case 503:
 150                                 return "SERVICE UNAVAILABLE";
 151                         case 504:
 152                                 return "GATEWAY TIMEOUT";
 153                         case 505:
 154                                 return "HTTP VERSION NOT SUPPORTED";
 155                         default:
 156                                 return "WTF";
 157                         break;
 158
 159                 }
 160         }
 161
 162         void SendHTTPError(int response)
 163         {
 164                 HTTPHeaders empty;
 165                 std::string data = "<html><head></head><body>Server error "+ConvToStr(response)+": "+Response(response)+"<br>"+
 166                                    "<small>Powered by <a href='http://www.inspircd.org'>InspIRCd</a></small></body></html>";
 167
 168                 SendHeaders(data.length(), response, empty);
 169                 WriteData(data);
 170         }
 171
 172         void SendHeaders(unsigned long size, int response, HTTPHeaders &rheaders)
 173         {
 174
 175                 WriteData(http_version + " "+ConvToStr(response)+" "+Response(response)+"\r\n");
 176
 177                 time_t local = ServerInstance->Time();
 178                 struct tm *timeinfo = gmtime(&local);
 179                 char *date = asctime(timeinfo);
 180                 date[strlen(date) - 1] = '\0';
 181                 rheaders.CreateHeader("Date", date);
 182
 183                 rheaders.CreateHeader("Server", "InspIRCd/m_httpd.so/1.2");
 184                 rheaders.SetHeader("Content-Length", ConvToStr(size));
 185
 186                 if (size)
 187                         rheaders.CreateHeader("Content-Type", "text/html");
 188                 else
 189                         rheaders.RemoveHeader("Content-Type");
 190
 191                 /* Supporting Connection: keep-alive causes a whole world of hurt syncronizing timeouts,
 192                  * so remove it, its not essential for what we need.
 193                  */
 194                 rheaders.SetHeader("Connection", "Close");
 195
 196                 WriteData(rheaders.GetFormattedHeaders());
 197                 WriteData("\r\n");
 198         }
 199
 200         void OnDataReady()
 201         {
 202                 if (InternalState == HTTP_SERVE_RECV_POSTDATA)
 203                 {
 204                         postdata.append(recvq);
 205                         if (postdata.length() >= postsize)
 206                                 ServeData();
 207                 }
 208                 else
 209                 {
 210                         reqbuffer.append(recvq);
 211
 212                         if (reqbuffer.length() >= 8192)
 213                         {
 214                                 ServerInstance->Logs->Log("m_httpd",DEBUG, "m_httpd dropped connection due to an oversized request buffer");
 215                                 reqbuffer.clear();
 216                                 SetError("Buffer");
 217                         }
 218
 219                         if (InternalState == HTTP_SERVE_WAIT_REQUEST)
 220                                 CheckRequestBuffer();
 221                 }
 222         }
 223
 224         void CheckRequestBuffer()
 225         {
 226                 std::string::size_type reqend = reqbuffer.find("\r\n\r\n");
 227                 if (reqend == std::string::npos)
 228                         return;
 229
 230                 // We have the headers; parse them all
 231                 std::string::size_type hbegin = 0, hend;
 232                 while ((hend = reqbuffer.find("\r\n", hbegin)) != std::string::npos)
 233                 {
 234                         if (hbegin == hend)
 235                                 break;
 236
 237                         if (request_type.empty())
 238                         {
 239                                 std::istringstream cheader(std::string(reqbuffer, hbegin, hend - hbegin));
 240                                 cheader >> request_type;
 241                                 cheader >> uri;
 242                                 cheader >> http_version;
 243
 244                                 if (request_type.empty() || uri.empty() || http_version.empty())
 245                                 {
 246                                         SendHTTPError(400);
 247                                         return;
 248                                 }
 249
 250                                 hbegin = hend + 2;
 251                                 continue;
 252                         }
 253
 254                         std::string cheader = reqbuffer.substr(hbegin, hend - hbegin);
 255
 256                         std::string::size_type fieldsep = cheader.find(':');
 257                         if ((fieldsep == std::string::npos) || (fieldsep == 0) || (fieldsep == cheader.length() - 1))
 258                         {
 259                                 SendHTTPError(400);
 260                                 return;
 261                         }
 262
 263                         headers.SetHeader(cheader.substr(0, fieldsep), cheader.substr(fieldsep + 2));
 264
 265                         hbegin = hend + 2;
 266                 }
 267
 268                 reqbuffer.erase(0, reqend + 4);
 269
 270                 std::transform(request_type.begin(), request_type.end(), request_type.begin(), ::toupper);
 271                 std::transform(http_version.begin(), http_version.end(), http_version.begin(), ::toupper);
 272
 273                 if ((http_version != "HTTP/1.1") && (http_version != "HTTP/1.0"))
 274                 {
 275                         SendHTTPError(505);
 276                         return;
 277                 }
 278
 279                 if (headers.IsSet("Content-Length") && (postsize = atoi(headers.GetHeader("Content-Length").c_str())) != 0)
 280                 {
 281                         InternalState = HTTP_SERVE_RECV_POSTDATA;
 282
 283                         if (reqbuffer.length() >= postsize)
 284                         {
 285                                 postdata = reqbuffer.substr(0, postsize);
 286                                 reqbuffer.erase(0, postsize);
 287                         }
 288                         else if (!reqbuffer.empty())
 289                         {
 290                                 postdata = reqbuffer;
 291                                 reqbuffer.clear();
 292                         }
 293
 294                         if (postdata.length() >= postsize)
 295                                 ServeData();
 296
 297                         return;
 298                 }
 299
 300                 ServeData();
 301         }
 302
 303         void ServeData()
 304         {
 305                 InternalState = HTTP_SERVE_SEND_DATA;
 306
 307                 if ((request_type == "GET") && (uri == "/"))
 308                 {
 309                         HTTPHeaders empty;
 310                         SendHeaders(index->ContentSize(), 200, empty);
 311                         WriteData(index->Contents());
 312                 }
 313                 else
 314                 {
 315                         claimed = false;
 316                         HTTPRequest acl((Module*)HttpModule, "httpd_acl", request_type, uri, &headers, this, ip, postdata);
 317                         acl.Send();
 318                         if (!claimed)
 319                         {
 320                                 HTTPRequest url((Module*)HttpModule, "httpd_url", request_type, uri, &headers, this, ip, postdata);
 321                                 url.Send();
 322                                 if (!claimed)
 323                                 {
 324                                         SendHTTPError(404);
 325                                 }
 326                         }
 327                 }
 328         }
 329
 330         void Page(std::stringstream* n, int response, HTTPHeaders *hheaders)
 331         {
 332                 SendHeaders(n->str().length(), response, *hheaders);
 333                 WriteData(n->str());
 334         }
 335 };
 336
 337 /** Spawn HTTP sockets from a listener
 338  */
 339 class HttpListener : public ListenSocketBase
 340 {
 341         FileReader* index;
 342
 343  public:
 344         HttpListener(FileReader *idx, int port, const std::string &addr)
 345                 : ListenSocketBase(port, addr, "httpd", "plaintext")
 346         {
 347                 this->index = idx;
 348         }
 349
 350         virtual void OnAcceptReady(int nfd)
 351         {
 352                 int port;
 353                 std::string incomingip;
 354                 irc::sockets::satoap(&client, incomingip, port);
 355                 new HttpServerSocket(nfd, incomingip.c_str(), index);
 356         }
 357 };
 358
 359 class ModuleHttpServer : public Module
 360 {
 361         std::vector<HttpServerSocket *> httpsocks;
 362         std::vector<HttpListener *> httplisteners;
 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                 HttpListener *http;
 373                 ConfigReader c;
 374
 375                 httpsocks.clear(); // XXX this will BREAK if this module is made rehashable
 376                 httplisteners.clear();
 377
 378                 for (int i = 0; i < c.Enumerate("http"); i++)
 379                 {
 380                         host = c.ReadValue("http", "host", i);
 381                         bindip = c.ReadValue("http", "ip", i);
 382                         port = c.ReadInteger("http", "port", i, true);
 383                         indexfile = c.ReadValue("http", "index", i);
 384                         index = new FileReader(indexfile);
 385                         if (!index->Exists())
 386                                 throw ModuleException("Can't read index file: "+indexfile);
 387                         http = new HttpListener(index, port, bindip);
 388                         httplisteners.push_back(http);
 389                 }
 390         }
 391
 392         ModuleHttpServer()      {
 393                 ReadConfig();
 394                 HttpModule = this;
 395         }
 396
 397         void OnRequest(Request& request)
 398         {
 399                 if (strcmp(request.id, "HTTP-DOC") != 0)
 400                         return;
 401                 HTTPDocumentResponse& resp = static_cast<HTTPDocumentResponse&>(request);
 402                 claimed = true;
 403                 resp.src.sock->Page(resp.document, resp.responsecode, &resp.headers);
 404         }
 405
 406
 407         virtual ~ModuleHttpServer()
 408         {
 409                 for (size_t i = 0; i < httplisteners.size(); i++)
 410                 {
 411                         delete httplisteners[i];
 412                 }
 413
 414                 for (size_t i = 0; i < httpsocks.size(); i++)
 415                 {
 416                         ServerInstance->SE->DelFd(httpsocks[i]);
 417                         httpsocks[i]->Close();
 418                         delete httpsocks[i]->GetIndex();
 419                 }
 420         }
 421
 422         virtual Version GetVersion()
 423         {
 424                 return Version("Provides HTTP serving facilities to modules", VF_VENDOR | VF_SERVICEPROVIDER, API_VERSION);
 425         }
 426 };
 427
 428 MODULE_INIT(ModuleHttpServer)