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         HttpState InternalState;
  39         std::string ip;
  40
  41         HTTPHeaders headers;
  42         std::string reqbuffer;
  43         std::string postdata;
  44         unsigned int postsize;
  45         std::string request_type;
  46         std::string uri;
  47         std::string http_version;
  48
  49  public:
  50
  51         HttpServerSocket(int newfd, const std::string& IP, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  52                 : BufferedSocket(newfd), ip(IP), postsize(0)
  53         {
  54                 InternalState = HTTP_SERVE_WAIT_REQUEST;
  55
  56                 FOREACH_MOD(I_OnHookIO, OnHookIO(this, via));
  57                 if (GetIOHook())
  58                         GetIOHook()->OnStreamSocketAccept(this, client, server);
  59         }
  60
  61         virtual void OnError(BufferedSocketError)
  62         {
  63         }
  64
  65         std::string Response(int response)
  66         {
  67                 switch (response)
  68                 {
  69                         case 100:
  70                                 return "CONTINUE";
  71                         case 101:
  72                                 return "SWITCHING PROTOCOLS";
  73                         case 200:
  74                                 return "OK";
  75                         case 201:
  76                                 return "CREATED";
  77                         case 202:
  78                                 return "ACCEPTED";
  79                         case 203:
  80                                 return "NON-AUTHORITATIVE INFORMATION";
  81                         case 204:
  82                                 return "NO CONTENT";
  83                         case 205:
  84                                 return "RESET CONTENT";
  85                         case 206:
  86                                 return "PARTIAL CONTENT";
  87                         case 300:
  88                                 return "MULTIPLE CHOICES";
  89                         case 301:
  90                                 return "MOVED PERMENANTLY";
  91                         case 302:
  92                                 return "FOUND";
  93                         case 303:
  94                                 return "SEE OTHER";
  95                         case 304:
  96                                 return "NOT MODIFIED";
  97                         case 305:
  98                                 return "USE PROXY";
  99                         case 307:
 100                                 return "TEMPORARY REDIRECT";
 101                         case 400:
 102                                 return "BAD REQUEST";
 103                         case 401:
 104                                 return "UNAUTHORIZED";
 105                         case 402:
 106                                 return "PAYMENT REQUIRED";
 107                         case 403:
 108                                 return "FORBIDDEN";
 109                         case 404:
 110                                 return "NOT FOUND";
 111                         case 405:
 112                                 return "METHOD NOT ALLOWED";
 113                         case 406:
 114                                 return "NOT ACCEPTABLE";
 115                         case 407:
 116                                 return "PROXY AUTHENTICATION REQUIRED";
 117                         case 408:
 118                                 return "REQUEST TIMEOUT";
 119                         case 409:
 120                                 return "CONFLICT";
 121                         case 410:
 122                                 return "GONE";
 123                         case 411:
 124                                 return "LENGTH REQUIRED";
 125                         case 412:
 126                                 return "PRECONDITION FAILED";
 127                         case 413:
 128                                 return "REQUEST ENTITY TOO LARGE";
 129                         case 414:
 130                                 return "REQUEST-URI TOO LONG";
 131                         case 415:
 132                                 return "UNSUPPORTED MEDIA TYPE";
 133                         case 416:
 134                                 return "REQUESTED RANGE NOT SATISFIABLE";
 135                         case 417:
 136                                 return "EXPECTATION FAILED";
 137                         case 500:
 138                                 return "INTERNAL SERVER ERROR";
 139                         case 501:
 140                                 return "NOT IMPLEMENTED";
 141                         case 502:
 142                                 return "BAD GATEWAY";
 143                         case 503:
 144                                 return "SERVICE UNAVAILABLE";
 145                         case 504:
 146                                 return "GATEWAY TIMEOUT";
 147                         case 505:
 148                                 return "HTTP VERSION NOT SUPPORTED";
 149                         default:
 150                                 return "WTF";
 151                         break;
 152
 153                 }
 154         }
 155
 156         void SendHTTPError(int response)
 157         {
 158                 HTTPHeaders empty;
 159                 std::string data = "<html><head></head><body>Server error "+ConvToStr(response)+": "+Response(response)+"<br>"+
 160                                    "<small>Powered by <a href='http://www.inspircd.org'>InspIRCd</a></small></body></html>";
 161
 162                 SendHeaders(data.length(), response, empty);
 163                 WriteData(data);
 164         }
 165
 166         void SendHeaders(unsigned long size, int response, HTTPHeaders &rheaders)
 167         {
 168
 169                 WriteData(http_version + " "+ConvToStr(response)+" "+Response(response)+"\r\n");
 170
 171                 time_t local = ServerInstance->Time();
 172                 struct tm *timeinfo = gmtime(&local);
 173                 char *date = asctime(timeinfo);
 174                 date[strlen(date) - 1] = '\0';
 175                 rheaders.CreateHeader("Date", date);
 176
 177                 rheaders.CreateHeader("Server", "InspIRCd/m_httpd.so/1.2");
 178                 rheaders.SetHeader("Content-Length", ConvToStr(size));
 179
 180                 if (size)
 181                         rheaders.CreateHeader("Content-Type", "text/html");
 182                 else
 183                         rheaders.RemoveHeader("Content-Type");
 184
 185                 /* Supporting Connection: keep-alive causes a whole world of hurt syncronizing timeouts,
 186                  * so remove it, its not essential for what we need.
 187                  */
 188                 rheaders.SetHeader("Connection", "Close");
 189
 190                 WriteData(rheaders.GetFormattedHeaders());
 191                 WriteData("\r\n");
 192         }
 193
 194         void OnDataReady()
 195         {
 196                 if (InternalState == HTTP_SERVE_RECV_POSTDATA)
 197                 {
 198                         postdata.append(recvq);
 199                         if (postdata.length() >= postsize)
 200                                 ServeData();
 201                 }
 202                 else
 203                 {
 204                         reqbuffer.append(recvq);
 205
 206                         if (reqbuffer.length() >= 8192)
 207                         {
 208                                 ServerInstance->Logs->Log("m_httpd",DEBUG, "m_httpd dropped connection due to an oversized request buffer");
 209                                 reqbuffer.clear();
 210                                 SetError("Buffer");
 211                         }
 212
 213                         if (InternalState == HTTP_SERVE_WAIT_REQUEST)
 214                                 CheckRequestBuffer();
 215                 }
 216         }
 217
 218         void CheckRequestBuffer()
 219         {
 220                 std::string::size_type reqend = reqbuffer.find("\r\n\r\n");
 221                 if (reqend == std::string::npos)
 222                         return;
 223
 224                 // We have the headers; parse them all
 225                 std::string::size_type hbegin = 0, hend;
 226                 while ((hend = reqbuffer.find("\r\n", hbegin)) != std::string::npos)
 227                 {
 228                         if (hbegin == hend)
 229                                 break;
 230
 231                         if (request_type.empty())
 232                         {
 233                                 std::istringstream cheader(std::string(reqbuffer, hbegin, hend - hbegin));
 234                                 cheader >> request_type;
 235                                 cheader >> uri;
 236                                 cheader >> http_version;
 237
 238                                 if (request_type.empty() || uri.empty() || http_version.empty())
 239                                 {
 240                                         SendHTTPError(400);
 241                                         return;
 242                                 }
 243
 244                                 hbegin = hend + 2;
 245                                 continue;
 246                         }
 247
 248                         std::string cheader = reqbuffer.substr(hbegin, hend - hbegin);
 249
 250                         std::string::size_type fieldsep = cheader.find(':');
 251                         if ((fieldsep == std::string::npos) || (fieldsep == 0) || (fieldsep == cheader.length() - 1))
 252                         {
 253                                 SendHTTPError(400);
 254                                 return;
 255                         }
 256
 257                         headers.SetHeader(cheader.substr(0, fieldsep), cheader.substr(fieldsep + 2));
 258
 259                         hbegin = hend + 2;
 260                 }
 261
 262                 reqbuffer.erase(0, reqend + 4);
 263
 264                 std::transform(request_type.begin(), request_type.end(), request_type.begin(), ::toupper);
 265                 std::transform(http_version.begin(), http_version.end(), http_version.begin(), ::toupper);
 266
 267                 if ((http_version != "HTTP/1.1") && (http_version != "HTTP/1.0"))
 268                 {
 269                         SendHTTPError(505);
 270                         return;
 271                 }
 272
 273                 if (headers.IsSet("Content-Length") && (postsize = atoi(headers.GetHeader("Content-Length").c_str())) != 0)
 274                 {
 275                         InternalState = HTTP_SERVE_RECV_POSTDATA;
 276
 277                         if (reqbuffer.length() >= postsize)
 278                         {
 279                                 postdata = reqbuffer.substr(0, postsize);
 280                                 reqbuffer.erase(0, postsize);
 281                         }
 282                         else if (!reqbuffer.empty())
 283                         {
 284                                 postdata = reqbuffer;
 285                                 reqbuffer.clear();
 286                         }
 287
 288                         if (postdata.length() >= postsize)
 289                                 ServeData();
 290
 291                         return;
 292                 }
 293
 294                 ServeData();
 295         }
 296
 297         void ServeData()
 298         {
 299                 InternalState = HTTP_SERVE_SEND_DATA;
 300
 301                 claimed = false;
 302                 HTTPRequest acl((Module*)HttpModule, "httpd_acl", request_type, uri, &headers, this, ip, postdata);
 303                 acl.Send();
 304                 if (!claimed)
 305                 {
 306                         HTTPRequest url((Module*)HttpModule, "httpd_url", request_type, uri, &headers, this, ip, postdata);
 307                         url.Send();
 308                         if (!claimed)
 309                         {
 310                                 SendHTTPError(404);
 311                         }
 312                 }
 313         }
 314
 315         void Page(std::stringstream* n, int response, HTTPHeaders *hheaders)
 316         {
 317                 SendHeaders(n->str().length(), response, *hheaders);
 318                 WriteData(n->str());
 319         }
 320 };
 321
 322 class ModuleHttpServer : public Module
 323 {
 324         std::vector<HttpServerSocket *> httpsocks;
 325  public:
 326
 327         ModuleHttpServer()      {
 328                 HttpModule = this;
 329         }
 330
 331         void OnRequest(Request& request)
 332         {
 333                 if (strcmp(request.id, "HTTP-DOC") != 0)
 334                         return;
 335                 HTTPDocumentResponse& resp = static_cast<HTTPDocumentResponse&>(request);
 336                 claimed = true;
 337                 resp.src.sock->Page(resp.document, resp.responsecode, &resp.headers);
 338         }
 339
 340         ModResult OnAcceptConnection(int nfd, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 341         {
 342                 if (from->bind_tag->getString("type") != "httpd");
 343                         return MOD_RES_PASSTHRU;
 344                 int port;
 345                 std::string incomingip;
 346                 irc::sockets::satoap(client, incomingip, port);
 347                 new HttpServerSocket(nfd, incomingip, from, client, server);
 348                 return MOD_RES_ALLOW;
 349         }
 350
 351
 352         virtual ~ModuleHttpServer()
 353         {
 354                 for (size_t i = 0; i < httpsocks.size(); i++)
 355                 {
 356                         httpsocks[i]->cull();
 357                         delete httpsocks[i];
 358                 }
 359         }
 360
 361         virtual Version GetVersion()
 362         {
 363                 return Version("Provides HTTP serving facilities to modules", VF_VENDOR);
 364         }
 365 };
 366
 367 MODULE_INIT(ModuleHttpServer)