src/IPFilter.cpp

   1 //
   2 // This file is part of the aMule Project.
   3 //
   4 // Copyright (c) 2003-2008 aMule Team ( admin@amule.org / http://www.amule.org )
   5 // Copyright (c) 2002 Merkur ( devs@emule-project.net / http://www.emule-project.net )
   6 //
   7 // Any parts of this program derived from the xMule, lMule or eMule project,
   8 // or contributed by third-party developers are copyrighted by their
   9 // respective authors.
  10 //
  11 // This program is free software; you can redistribute it and/or modify
  12 // it under the terms of the GNU General Public License as published by
  13 // the Free Software Foundation; either version 2 of the License, or
  14 // (at your option) any later version.
  15 //
  16 // This program is distributed in the hope that it will be useful,
  17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 // GNU General Public License for more details.
  20 //
  21 // You should have received a copy of the GNU General Public License
  22 // along with this program; if not, write to the Free Software
  23 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
  24 //
  25
  26 #include <wx/stdpaths.h>                // Needed for GetDataDir
  27
  28 #include "IPFilter.h"                   // Interface declarations.
  29 #include "Preferences.h"                // Needed for thePrefs
  30 #include "amule.h"                      // Needed for theApp
  31 #include "Statistics.h"                 // Needed for theStats
  32 #include "HTTPDownload.h"               // Needed for CHTTPDownloadThread
  33 #include "Logger.h"                     // Needed for AddDebugLogLineM
  34 #include <common/Format.h>              // Needed for CFormat
  35 #include <common/StringFunctions.h>     // Needed for CSimpleTokenizer
  36 #include <common/FileFunctions.h>       // Needed for UnpackArchive
  37 #include <common/TextFile.h>            // Needed for CTextFile
  38 #include "ThreadScheduler.h"            // Needed for CThreadScheduler and CThreadTask
  39 #include "ClientList.h"                 // Needed for CClientList
  40 #include "ServerList.h"                 // Needed for CServerList
  41
  42
  43 ////////////////////////////////////////////////////////////
  44 // CIPFilterEvent
  45
  46 BEGIN_DECLARE_EVENT_TYPES()
  47         DECLARE_EVENT_TYPE(MULE_EVT_IPFILTER_LOADED, -1)
  48 END_DECLARE_EVENT_TYPES()
  49
  50 DEFINE_EVENT_TYPE(MULE_EVT_IPFILTER_LOADED)
  51
  52
  53 class CIPFilterEvent : public wxEvent
  54 {
  55 public:
  56         CIPFilterEvent(CIPFilter::IPMap& result)
  57                 : wxEvent(-1, MULE_EVT_IPFILTER_LOADED)
  58         {
  59                 // Avoid needles copying
  60                 std::swap(result, m_result);
  61         }
  62
  63         /** @see wxEvent::Clone */
  64         virtual wxEvent* Clone() const {
  65                 return new CIPFilterEvent(*this);
  66         }
  67
  68         CIPFilter::IPMap m_result;
  69 };
  70
  71
  72 typedef void (wxEvtHandler::*MuleIPFilterEventFunction)(CIPFilterEvent&);
  73
  74 //! Event-handler for completed hashings of new shared files and partfiles.
  75 #define EVT_MULE_IPFILTER_LOADED(func) \
  76         DECLARE_EVENT_TABLE_ENTRY(MULE_EVT_IPFILTER_LOADED, -1, -1, \
  77         (wxObjectEventFunction) (wxEventFunction) \
  78         wxStaticCastEvent(MuleIPFilterEventFunction, &func), (wxObject*) NULL),
  79
  80
  81 ////////////////////////////////////////////////////////////
  82 // Thread task for loading the ipfilter.dat files.
  83
  84 /**
  85  * This task loads the two ipfilter.dat files, a task that
  86  * can take quite a while on a slow system with a large dat-
  87  * file.
  88  */
  89 class CIPFilterTask : public CThreadTask
  90 {
  91 public:
  92         CIPFilterTask(wxEvtHandler* owner)
  93                 : CThreadTask(wxT("Load IPFilter"), wxEmptyString, ETP_Critical),
  94                   m_owner(owner)
  95         {
  96         }
  97
  98         void Entry() {
  99                 wxStandardPathsBase &spb(wxStandardPaths::Get());
 100 #ifdef __WXMSW__
 101                 wxString dataDir(spb.GetPluginsDir());
 102 #elif defined(__WXMAC__)
 103                 wxString dataDir(spb.GetDataDir());
 104 #else
 105                 wxString dataDir(spb.GetDataDir().BeforeLast(wxT('/')) + wxT("/amule"));
 106 #endif
 107                 wxString systemwideFile(JoinPaths(dataDir,wxT("ipfilter.dat")));
 108
 109                 AddLogLineM(false, _("Loading IP-filters 'ipfilter.dat' and 'ipfilter_static.dat'."));
 110                 if ( !LoadFromFile(theApp->ConfigDir + wxT("ipfilter.dat")) &&
 111                      thePrefs::UseIPFilterSystem() ) {
 112                         LoadFromFile(systemwideFile);
 113                 }
 114
 115
 116                 LoadFromFile(theApp->ConfigDir + wxT("ipfilter_static.dat"));
 117
 118                 CIPFilterEvent evt(m_result);
 119                 wxPostEvent(m_owner, evt);
 120         }
 121 private:
 122
 123
 124         /**
 125          * Helper function.
 126          *
 127          * @param IPstart The start of the IP-range.
 128          * @param IPend The end of the IP-range, must be less than or equal to IPstart.
 129          * @param AccessLevel The AccessLevel of this range.
 130          * @param Description The assosiated description of this range.
 131          * @return true if the range was added, false if it was discarded.
 132          *
 133          * This function inserts the specified range into the IPMap. Invalid
 134          * ranges where the AccessLevel is not within the range 0..255, or
 135          * where IPEnd < IPstart not inserted.
 136          */
 137         bool AddIPRange(uint32 IPStart, uint32 IPEnd, uint16 AccessLevel, const wxString& Description)
 138         {
 139                 if (AccessLevel < 256) {
 140                         if (IPStart <= IPEnd) {
 141                                 CIPFilter::rangeObject item;
 142                                 item.AccessLevel = AccessLevel;
 143 #ifdef __DEBUG__
 144                                 item.Description = Description;
 145 #endif
 146
 147                                 m_result.insert(IPStart, IPEnd, item);
 148
 149                                 return true;
 150                         }
 151                 }
 152
 153                 return false;
 154         }
 155
 156
 157         /**
 158          * Helper function.
 159          *
 160          * @param str A string representation of an IP-range in the format "<ip>-<ip>".
 161          * @param ipA The target of the first IP in the range.
 162          * @param ipB The target of the second IP in the range.
 163          * @return True if the parsing succeded, false otherwise (results will be invalid).
 164          *
 165          * The IPs returned by this function are in host order, not network order.
 166          */
 167         bool m_inet_atoh(const wxString &str, uint32& ipA, uint32& ipB)
 168         {
 169                 wxString first = str.BeforeFirst(wxT('-'));
 170                 wxString second = str.Mid(first.Len() + 1);
 171
 172                 bool result = StringIPtoUint32(first, ipA) && StringIPtoUint32(second, ipB);
 173
 174                 // StringIPtoUint32 saves the ip in anti-host order, but in order
 175                 // to be able to make relational comparisons, we need to convert
 176                 // it back to host-order.
 177                 ipA = wxUINT32_SWAP_ALWAYS(ipA);
 178                 ipB = wxUINT32_SWAP_ALWAYS(ipB);
 179
 180                 return result;
 181         }
 182
 183
 184         /**
 185          * Helper-function for processing the PeerGuardian format.
 186          *
 187          * @return True if the line was valid, false otherwise.
 188          *
 189          * This function will correctly parse files that follow the folllowing
 190          * format for specifying IP-ranges (whitespace is optional):
 191          *  <IPStart> - <IPEnd> , <AccessLevel> , <Description>
 192          */
 193         bool ProcessPeerGuardianLine(const wxString& sLine)
 194         {
 195                 CSimpleTokenizer tkz(sLine, wxT(','));
 196
 197                 wxString first  = tkz.next();
 198                 wxString second = tkz.next();
 199                 wxString third  = tkz.remaining().Strip(wxString::both);
 200
 201                 // If there were less than two tokens, fail
 202                 if (tkz.tokenCount() != 2) {
 203                         return false;
 204                 }
 205
 206                 // Convert string IP's to host order IP numbers
 207                 uint32 IPStart = 0;
 208                 uint32 IPEnd   = 0;
 209
 210                 // This will also fail if the line is commented out
 211                 if (!m_inet_atoh(first, IPStart, IPEnd)) {
 212                         return false;
 213                 }
 214
 215                 // Second token is Access Level, default is 0.
 216                 unsigned long AccessLevel = 0;
 217                 if (!second.Strip(wxString::both).ToULong(&AccessLevel) || AccessLevel >= 255) {
 218                         return false;
 219                 }
 220
 221                 // Add the filter
 222                 return AddIPRange(IPStart, IPEnd, AccessLevel, third);
 223         }
 224
 225
 226         /**
 227          * Helper-function for processing the AntiP2P format.
 228          *
 229          * @return True if the line was valid, false otherwise.
 230          *
 231          * This function will correctly parse files that follow the folllowing
 232          * format for specifying IP-ranges (whitespace is optional):
 233          *  <Description> : <IPStart> - <IPEnd>
 234          */
 235         bool ProcessAntiP2PLine(const wxString& sLine)
 236         {
 237                 // remove spaces from the left and right.
 238                 const wxString line = sLine.Strip(wxString::leading);
 239
 240                 // Extract description (first) and IP-range (second) form the line
 241                 int pos = line.Find(wxT(':'), true);
 242                 if (pos == -1) {
 243                         return false;
 244                 }
 245
 246                 wxString Description = line.Left(pos).Strip(wxString::trailing);
 247                 wxString IPRange     = line.Right(line.Len() - pos - 1);
 248
 249                 // Convert string IP's to host order IP numbers
 250                 uint32 IPStart = 0;
 251                 uint32 IPEnd   = 0;
 252
 253                 if (!m_inet_atoh(IPRange ,IPStart, IPEnd)) {
 254                         return false;
 255                 }
 256
 257                 // Add the filter
 258                 return AddIPRange(IPStart, IPEnd, 0, Description);
 259         }
 260
 261
 262         /**
 263          * Loads a IP-list from the specified file, can be text or zip.
 264          *
 265          * @return True if the file was loaded, false otherwise.
 266          **/
 267         int LoadFromFile(const wxString& file)
 268         {
 269                 const CPath path = CPath(file);
 270
 271                 if (!path.FileExists() /* || TestDestroy() (see CIPFilter::Reload()) */) {
 272                         return 0;
 273                 }
 274
 275                 const wxChar* ipfilter_files[] = {
 276                         wxT("ipfilter.dat"),
 277                         wxT("guarding.p2p"),
 278                         NULL
 279                 };
 280
 281                 // Try to unpack the file, might be an archive
 282                 if (UnpackArchive(path, ipfilter_files).second != EFT_Text) {
 283                         AddLogLineM(true,
 284                                 CFormat(_("Failed to load ipfilter.dat file '%s', unknown format encountered.")) % file);
 285                         return 0;
 286                 }
 287
 288                 int filtercount = 0;
 289                 int discardedCount = 0;
 290
 291                 CTextFile readFile;
 292                 if (readFile.Open(path, CTextFile::read)) {
 293                         // Function pointer-type of the parse-functions we can use
 294                         typedef bool (CIPFilterTask::*ParseFunc)(const wxString&);
 295
 296                         ParseFunc func = NULL;
 297
 298                         while (!readFile.Eof()) {
 299                                 wxString line = readFile.GetNextLine();
 300
 301                                 /* See CIPFilter::Reload()
 302                                   if (TestDestroy()) {
 303                                         return 0;
 304                                 } else */ if (func && (*this.*func)(line)) {
 305                                         filtercount++;
 306                                 } else if (ProcessPeerGuardianLine(line)) {
 307                                         func = &CIPFilterTask::ProcessPeerGuardianLine;
 308                                         filtercount++;
 309                                 } else if (ProcessAntiP2PLine(line)) {
 310                                         func = &CIPFilterTask::ProcessAntiP2PLine;
 311                                         filtercount++;
 312                                 } else {
 313                                         // Comments and empty lines are ignored
 314                                         line = line.Strip(wxString::both);
 315
 316                                         if (!line.IsEmpty() && !line.StartsWith(wxT("#"))) {
 317                                                 discardedCount++;
 318                                                 AddDebugLogLineM(false, logIPFilter, wxT(
 319                                                         "Invalid line found while reading ipfilter file: ") + line);
 320                                         }
 321                                 }
 322                         }
 323                 } else {
 324                         AddLogLineM(true, CFormat(_(
 325                                 "Failed to load ipfilter.dat file '%s', could not open file.")) % file);
 326                         return 0;
 327                 }
 328
 329                 AddLogLineM(false,
 330                         ( CFormat(wxPLURAL("Loaded %u IP-range from '%s'.", "Loaded %u IP-ranges from '%s'.", filtercount)) % filtercount % file )
 331                         + wxT(" ") +
 332                         ( CFormat(wxPLURAL("%u malformed line was discarded.", "%u malformed lines were discarded.", discardedCount)) % discardedCount )
 333                 );
 334
 335                 return filtercount;
 336         }
 337
 338 private:
 339         wxEvtHandler*           m_owner;
 340         CIPFilter::IPMap        m_result;
 341 };
 342
 343
 344 ////////////////////////////////////////////////////////////
 345 // CIPFilter
 346
 347
 348 BEGIN_EVENT_TABLE(CIPFilter, wxEvtHandler)
 349         EVT_MULE_IPFILTER_LOADED(CIPFilter::OnIPFilterEvent)
 350 END_EVENT_TABLE()
 351
 352
 353
 354 /**
 355  * This function creates a text-file containing the specified text,
 356  * but only if the file does not already exist.
 357  */
 358 void CreateDummyFile(const wxString& filename, const wxString& text)
 359 {
 360         // Create template files
 361         if (!wxFileExists(filename)) {
 362                 CTextFile file;
 363
 364                 if (file.Open(filename, CTextFile::write)) {
 365                         file.WriteLine(text);
 366                 }
 367         }
 368 }
 369
 370
 371 CIPFilter::CIPFilter()
 372 {
 373         // Setup dummy files for the curious user.
 374         const wxString normalDat = theApp->ConfigDir + wxT("ipfilter.dat");
 375         const wxString normalMsg = wxString()
 376                 << wxT("# This file is used by aMule to store ipfilter lists downloaded\n")
 377                 << wxT("# through the auto-update functionality. Do not save ipfilter-\n")
 378                 << wxT("# ranges here that should not be overwritten by aMule.\n");
 379
 380         CreateDummyFile(normalDat, normalMsg);
 381
 382         const wxString staticDat = theApp->ConfigDir + wxT("ipfilter_static.dat");
 383         const wxString staticMsg = wxString()
 384                 << wxT("# This file is used to store ipfilter-ranges that should\n")
 385                 << wxT("# not be overwritten by aMule. If you wish to keep a custom\n")
 386                 << wxT("# set of ipfilter-ranges that take precedence over ipfilter-\n")
 387                 << wxT("# ranges aquired through the auto-update functionality, then\n")
 388                 << wxT("# place them in this file. aMule will not change this file.");
 389
 390         CreateDummyFile(staticDat, staticMsg);
 391
 392         Reload();
 393 }
 394
 395
 396 void CIPFilter::Reload()
 397 {
 398         // We keep the current filter till the new one has been loaded.
 399         //CThreadScheduler::AddTask(new CIPFilterTask(this));
 400
 401         // This procedure cannot be run as a task,
 402         // wxArchiveFSHandler::FindFirst() will eventually call wxExecute(),
 403         // and this can only be done from the main task.
 404         //
 405         // This way, We call the Entry() routine manually and comment out the
 406         // calls to TestDestroy().
 407         CIPFilterTask ipf_task(this);
 408         ipf_task.Entry();
 409 }
 410
 411
 412 uint32 CIPFilter::BanCount() const
 413 {
 414         wxMutexLocker lock(m_mutex);
 415
 416         return m_iplist.size();
 417 }
 418
 419
 420 bool CIPFilter::IsFiltered(uint32 IPTest, bool isServer)
 421 {
 422         if ((thePrefs::IsFilteringClients() && !isServer) || (thePrefs::IsFilteringServers() && isServer)) {
 423                 wxMutexLocker lock(m_mutex);
 424
 425                 // The IP needs to be in host order
 426                 IPMap::iterator it = m_iplist.find_range(wxUINT32_SWAP_ALWAYS(IPTest));
 427
 428                 if (it != m_iplist.end()) {
 429                         if (it->AccessLevel < thePrefs::GetIPFilterLevel()) {
 430 #ifdef __DEBUG__
 431                                 AddDebugLogLineM(false, logIPFilter, wxString(wxT("Filtered IP (AccLvl: ")) << (long)it->AccessLevel << wxT("): ")
 432                                                 << Uint32toStringIP(IPTest) << wxT(" (") << it->Description + wxT(")"));
 433 #endif
 434
 435                                 if (isServer) {
 436                                         theStats::AddFilteredServer();
 437                                 } else {
 438                                         theStats::AddFilteredClient();
 439                                 }
 440                                 return true;
 441                         }
 442                 }
 443         }
 444
 445         return false;
 446 }
 447
 448
 449 void CIPFilter::Update(const wxString& strURL)
 450 {
 451         if (!strURL.IsEmpty()) {
 452                 wxString filename = theApp->ConfigDir + wxT("ipfilter.download");
 453                 CHTTPDownloadThread *downloader = new CHTTPDownloadThread(strURL, filename, HTTP_IPFilter);
 454
 455                 downloader->Create();
 456                 downloader->Run();
 457         }
 458 }
 459
 460
 461 void CIPFilter::DownloadFinished(uint32 result)
 462 {
 463         if (result == 1) {
 464                 // download succeeded. proceed with ipfilter loading
 465                 wxString newDat = theApp->ConfigDir + wxT("ipfilter.download");
 466                 wxString oldDat = theApp->ConfigDir + wxT("ipfilter.dat");
 467
 468                 if (wxFileExists(oldDat)) {
 469                         if (!wxRemoveFile(oldDat)) {
 470                                 AddDebugLogLineM(true, logIPFilter,
 471                                         wxT("Failed to remove ipfilter.dat file, aborting update."));
 472                                 return;
 473                         }
 474                 }
 475
 476                 if (!wxRenameFile(newDat, oldDat)) {
 477                         AddDebugLogLineM(true, logIPFilter,
 478                                 wxT("Failed to rename new ipfilter.dat file, aborting update."));
 479                         return;
 480                 }
 481
 482                 // Reload both ipfilter files
 483                 Reload();
 484         } else {
 485                 AddDebugLogLineM(true, logIPFilter,
 486                         wxT("Failed to download the ipfilter from ") + thePrefs::IPFilterURL());
 487         }
 488 }
 489
 490
 491 void CIPFilter::OnIPFilterEvent(CIPFilterEvent& evt)
 492 {
 493         {
 494                 wxMutexLocker lock(m_mutex);
 495                 std::swap(m_iplist, evt.m_result);
 496         }
 497
 498         if (thePrefs::IsFilteringClients()) {
 499                 theApp->clientlist->FilterQueues();
 500         }
 501         if (thePrefs::IsFilteringServers()) {
 502                 theApp->serverlist->FilterServers();
 503         }
 504 }
 505
 506 // File_checked_for_headers