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 std::set<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
  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  public:
  60         const time_t createtime;
  61
  62         HttpServerSocket(int newfd, const std::string& IP, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  63                 : BufferedSocket(newfd), ip(IP), postsize(0)
  64                 , createtime(ServerInstance->Time())
  65         {
  66                 InternalState = HTTP_SERVE_WAIT_REQUEST;
  67
  68                 if (via->iohookprov)
  69                         via->iohookprov->OnAccept(this, client, server);
  70         }
  71
  72         ~HttpServerSocket()
  73         {
  74                 sockets.erase(this);
  75         }
  76
  77         void OnError(BufferedSocketError) CXX11_OVERRIDE
  78         {
  79                 ServerInstance->GlobalCulls.AddItem(this);
  80         }
  81
  82         std::string Response(int response)
  83         {
  84                 switch (response)
  85                 {
  86                         case 100:
  87                                 return "CONTINUE";
  88                         case 101:
  89                                 return "SWITCHING PROTOCOLS";
  90                         case 200:
  91                                 return "OK";
  92                         case 201:
  93                                 return "CREATED";
  94                         case 202:
  95                                 return "ACCEPTED";
  96                         case 203:
  97                                 return "NON-AUTHORITATIVE INFORMATION";
  98                         case 204:
  99                                 return "NO CONTENT";
 100                         case 205:
 101                                 return "RESET CONTENT";
 102                         case 206:
 103                                 return "PARTIAL CONTENT";
 104                         case 300:
 105                                 return "MULTIPLE CHOICES";
 106                         case 301:
 107                                 return "MOVED PERMANENTLY";
 108                         case 302:
 109                                 return "FOUND";
 110                         case 303:
 111                                 return "SEE OTHER";
 112                         case 304:
 113                                 return "NOT MODIFIED";
 114                         case 305:
 115                                 return "USE PROXY";
 116                         case 307:
 117                                 return "TEMPORARY REDIRECT";
 118                         case 400:
 119                                 return "BAD REQUEST";
 120                         case 401:
 121                                 return "UNAUTHORIZED";
 122                         case 402:
 123                                 return "PAYMENT REQUIRED";
 124                         case 403:
 125                                 return "FORBIDDEN";
 126                         case 404:
 127                                 return "NOT FOUND";
 128                         case 405:
 129                                 return "METHOD NOT ALLOWED";
 130                         case 406:
 131                                 return "NOT ACCEPTABLE";
 132                         case 407:
 133                                 return "PROXY AUTHENTICATION REQUIRED";
 134                         case 408:
 135                                 return "REQUEST TIMEOUT";
 136                         case 409:
 137                                 return "CONFLICT";
 138                         case 410:
 139                                 return "GONE";
 140                         case 411:
 141                                 return "LENGTH REQUIRED";
 142                         case 412:
 143                                 return "PRECONDITION FAILED";
 144                         case 413:
 145                                 return "REQUEST ENTITY TOO LARGE";
 146                         case 414:
 147                                 return "REQUEST-URI TOO LONG";
 148                         case 415:
 149                                 return "UNSUPPORTED MEDIA TYPE";
 150                         case 416:
 151                                 return "REQUESTED RANGE NOT SATISFIABLE";
 152                         case 417:
 153                                 return "EXPECTATION FAILED";
 154                         case 500:
 155                                 return "INTERNAL SERVER ERROR";
 156                         case 501:
 157                                 return "NOT IMPLEMENTED";
 158                         case 502:
 159                                 return "BAD GATEWAY";
 160                         case 503:
 161                                 return "SERVICE UNAVAILABLE";
 162                         case 504:
 163                                 return "GATEWAY TIMEOUT";
 164                         case 505:
 165                                 return "HTTP VERSION NOT SUPPORTED";
 166                         default:
 167                                 return "WTF";
 168                         break;
 169
 170                 }
 171         }
 172
 173         void SendHTTPError(int response)
 174         {
 175                 HTTPHeaders empty;
 176                 std::string data = "<html><head></head><body>Server error "+ConvToStr(response)+": "+Response(response)+"<br>"+
 177                                    "<small>Powered by <a href='http://www.inspircd.org'>InspIRCd</a></small></body></html>";
 178
 179                 SendHeaders(data.length(), response, empty);
 180                 WriteData(data);
 181         }
 182
 183         void SendHeaders(unsigned long size, int response, HTTPHeaders &rheaders)
 184         {
 185
 186                 WriteData(http_version + " "+ConvToStr(response)+" "+Response(response)+"\r\n");
 187
 188                 rheaders.CreateHeader("Date", InspIRCd::TimeString(ServerInstance->Time(), "%a, %d %b %Y %H:%M:%S GMT", true));
 189                 rheaders.CreateHeader("Server", INSPIRCD_BRANCH);
 190                 rheaders.SetHeader("Content-Length", ConvToStr(size));
 191
 192                 if (size)
 193                         rheaders.CreateHeader("Content-Type", "text/html");
 194                 else
 195                         rheaders.RemoveHeader("Content-Type");
 196
 197                 /* Supporting Connection: keep-alive causes a whole world of hurt syncronizing timeouts,
 198                  * so remove it, its not essential for what we need.
 199                  */
 200                 rheaders.SetHeader("Connection", "Close");
 201
 202                 WriteData(rheaders.GetFormattedHeaders());
 203                 WriteData("\r\n");
 204         }
 205
 206         void OnDataReady()
 207         {
 208                 if (InternalState == HTTP_SERVE_RECV_POSTDATA)
 209                 {
 210                         postdata.append(recvq);
 211                         if (postdata.length() >= postsize)
 212                                 ServeData();
 213                 }
 214                 else
 215                 {
 216                         reqbuffer.append(recvq);
 217
 218                         if (reqbuffer.length() >= 8192)
 219                         {
 220                                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "m_httpd dropped connection due to an oversized request buffer");
 221                                 reqbuffer.clear();
 222                                 SetError("Buffer");
 223                         }
 224
 225                         if (InternalState == HTTP_SERVE_WAIT_REQUEST)
 226                                 CheckRequestBuffer();
 227                 }
 228         }
 229
 230         void CheckRequestBuffer()
 231         {
 232                 std::string::size_type reqend = reqbuffer.find("\r\n\r\n");
 233                 if (reqend == std::string::npos)
 234                         return;
 235
 236                 // We have the headers; parse them all
 237                 std::string::size_type hbegin = 0, hend;
 238                 while ((hend = reqbuffer.find("\r\n", hbegin)) != std::string::npos)
 239                 {
 240                         if (hbegin == hend)
 241                                 break;
 242
 243                         if (request_type.empty())
 244                         {
 245                                 std::istringstream cheader(std::string(reqbuffer, hbegin, hend - hbegin));
 246                                 cheader >> request_type;
 247                                 cheader >> uri;
 248                                 cheader >> http_version;
 249
 250                                 if (request_type.empty() || uri.empty() || http_version.empty())
 251                                 {
 252                                         SendHTTPError(400);
 253                                         return;
 254                                 }
 255
 256                                 hbegin = hend + 2;
 257                                 continue;
 258                         }
 259
 260                         std::string cheader = reqbuffer.substr(hbegin, hend - hbegin);
 261
 262                         std::string::size_type fieldsep = cheader.find(':');
 263                         if ((fieldsep == std::string::npos) || (fieldsep == 0) || (fieldsep == cheader.length() - 1))
 264                         {
 265                                 SendHTTPError(400);
 266                                 return;
 267                         }
 268
 269                         headers.SetHeader(cheader.substr(0, fieldsep), cheader.substr(fieldsep + 2));
 270
 271                         hbegin = hend + 2;
 272                 }
 273
 274                 reqbuffer.erase(0, reqend + 4);
 275
 276                 std::transform(request_type.begin(), request_type.end(), request_type.begin(), ::toupper);
 277                 std::transform(http_version.begin(), http_version.end(), http_version.begin(), ::toupper);
 278
 279                 if ((http_version != "HTTP/1.1") && (http_version != "HTTP/1.0"))
 280                 {
 281                         SendHTTPError(505);
 282                         return;
 283                 }
 284
 285                 if (headers.IsSet("Content-Length") && (postsize = ConvToInt(headers.GetHeader("Content-Length"))) > 0)
 286                 {
 287                         InternalState = HTTP_SERVE_RECV_POSTDATA;
 288
 289                         if (reqbuffer.length() >= postsize)
 290                         {
 291                                 postdata = reqbuffer.substr(0, postsize);
 292                                 reqbuffer.erase(0, postsize);
 293                         }
 294                         else if (!reqbuffer.empty())
 295                         {
 296                                 postdata = reqbuffer;
 297                                 reqbuffer.clear();
 298                         }
 299
 300                         if (postdata.length() >= postsize)
 301                                 ServeData();
 302
 303                         return;
 304                 }
 305
 306                 ServeData();
 307         }
 308
 309         void ServeData()
 310         {
 311                 InternalState = HTTP_SERVE_SEND_DATA;
 312
 313                 claimed = false;
 314                 HTTPRequest acl((Module*)HttpModule, "httpd_acl", request_type, uri, &headers, this, ip, postdata);
 315                 acl.Send();
 316                 if (!claimed)
 317                 {
 318                         HTTPRequest url((Module*)HttpModule, "httpd_url", request_type, uri, &headers, this, ip, postdata);
 319                         url.Send();
 320                         if (!claimed)
 321                         {
 322                                 SendHTTPError(404);
 323                         }
 324                 }
 325         }
 326
 327         void Page(std::stringstream* n, int response, HTTPHeaders *hheaders)
 328         {
 329                 SendHeaders(n->str().length(), response, *hheaders);
 330                 WriteData(n->str());
 331         }
 332 };
 333
 334 class HTTPdAPIImpl : public HTTPdAPIBase
 335 {
 336  public:
 337         HTTPdAPIImpl(Module* parent)
 338                 : HTTPdAPIBase(parent)
 339         {
 340         }
 341
 342         void SendResponse(HTTPDocumentResponse& resp) CXX11_OVERRIDE
 343         {
 344                 claimed = true;
 345                 resp.src.sock->Page(resp.document, resp.responsecode, &resp.headers);
 346         }
 347 };
 348
 349 class ModuleHttpServer : public Module
 350 {
 351         HTTPdAPIImpl APIImpl;
 352         unsigned int timeoutsec;
 353
 354  public:
 355         ModuleHttpServer()
 356                 : APIImpl(this)
 357         {
 358         }
 359
 360         void init() CXX11_OVERRIDE
 361         {
 362                 HttpModule = this;
 363         }
 364
 365         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 366         {
 367                 ConfigTag* tag = ServerInstance->Config->ConfValue("httpd");
 368                 timeoutsec = tag->getInt("timeout", 10, 1);
 369         }
 370
 371         ModResult OnAcceptConnection(int nfd, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
 372         {
 373                 if (from->bind_tag->getString("type") != "httpd")
 374                         return MOD_RES_PASSTHRU;
 375                 int port;
 376                 std::string incomingip;
 377                 irc::sockets::satoap(*client, incomingip, port);
 378                 sockets.insert(new HttpServerSocket(nfd, incomingip, from, client, server));
 379                 return MOD_RES_ALLOW;
 380         }
 381
 382         void OnBackgroundTimer(time_t curtime) CXX11_OVERRIDE
 383         {
 384                 time_t oldest_allowed = curtime - timeoutsec;
 385                 for (std::set<HttpServerSocket*>::const_iterator i = sockets.begin(); i != sockets.end(); )
 386                 {
 387                         HttpServerSocket* sock = *i;
 388                         ++i;
 389                         if (sock->createtime < oldest_allowed)
 390                         {
 391                                 sock->cull();
 392                                 delete sock;
 393                         }
 394                 }
 395         }
 396
 397         CullResult cull() CXX11_OVERRIDE
 398         {
 399                 std::set<HttpServerSocket*> local;
 400                 local.swap(sockets);
 401                 for (std::set<HttpServerSocket*>::const_iterator i = local.begin(); i != local.end(); ++i)
 402                 {
 403                         HttpServerSocket* sock = *i;
 404                         sock->cull();
 405                         delete sock;
 406                 }
 407                 return Module::cull();
 408         }
 409
 410         Version GetVersion() CXX11_OVERRIDE
 411         {
 412                 return Version("Provides HTTP serving facilities to modules", VF_VENDOR);
 413         }
 414 };
 415
 416 MODULE_INIT(ModuleHttpServer)