src/unix/dialup.cpp

   1 // -*- c++ -*- ////////////////////////////////////////////////////////////////
   2 // Name:        unix/dialup.cpp
   3 // Purpose:     Network related wxWidgets classes and functions
   4 // Author:      Karsten Ballüder
   5 // Modified by:
   6 // Created:     03.10.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Karsten Ballüder
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // for compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #include "wx/setup.h"
  16
  17 #if wxUSE_DIALUP_MANAGER
  18
  19 #ifndef  WX_PRECOMP
  20 #   include "wx/defs.h"
  21 #endif // !PCH
  22
  23 #include "wx/string.h"
  24 #include "wx/event.h"
  25 #include "wx/dialup.h"
  26 #include "wx/timer.h"
  27 #include "wx/filefn.h"
  28 #include "wx/utils.h"
  29 #include "wx/log.h"
  30 #include "wx/ffile.h"
  31 #include "wx/process.h"
  32 #include "wx/intl.h"
  33 #include "wx/app.h"
  34 #include "wx/wxchar.h"
  35
  36 #include <stdlib.h>
  37
  38 #include <signal.h>
  39 #include <fcntl.h>
  40 #include <unistd.h>
  41 #define __STRICT_ANSI__
  42 #include <sys/socket.h>
  43 #include <netdb.h>
  44 #include <netinet/in.h>
  45 #include <arpa/inet.h>
  46 #include <errno.h>
  47
  48 DEFINE_EVENT_TYPE(wxEVT_DIALUP_CONNECTED)
  49 DEFINE_EVENT_TYPE(wxEVT_DIALUP_DISCONNECTED)
  50
  51 // ----------------------------------------------------------------------------
  52 // A class which groups functions dealing with connecting to the network from a
  53 // workstation using dial-up access to the net. There is at most one instance
  54 // of this class in the program accessed via GetDialUpManager().
  55 // ----------------------------------------------------------------------------
  56
  57 /* TODO
  58  *
  59  * 1. more configurability for Unix: i.e. how to initiate the connection, how
  60  *    to check for online status, &c.
  61  * 2. add a "long Dial(long connectionId = -1)" function which asks the user
  62  *    about which connection to dial (this may be done using native dialogs
  63  *    under NT, need generic dialogs for all others) and returns the identifier
  64  *    of the selected connection (it's opaque to the application) - it may be
  65  *    reused later to dial the same connection later (or use strings instead of
  66  *    longs may be?)
  67  * 3. add an async version of dialing functions which notify the caller about
  68  *    the progress (or may be even start another thread to monitor it)
  69  * 4. the static creation/accessor functions are not MT-safe - but is this
  70  *    really crucial? I think we may suppose they're always called from the
  71  *    main thread?
  72  */
  73
  74 class WXDLLEXPORT wxDialUpManagerImpl : public wxDialUpManager
  75 {
  76 public:
  77    wxDialUpManagerImpl();
  78    ~wxDialUpManagerImpl();
  79
  80    /** Could the dialup manager be initialized correctly? If this function
  81        returns false, no other functions will work neither, so it's a good idea
  82        to call this function and check its result before calling any other
  83        wxDialUpManager methods.
  84    */
  85    virtual bool IsOk() const
  86       { return true; }
  87
  88    /** The simplest way to initiate a dial up: this function dials the given
  89        ISP (exact meaning of the parameter depends on the platform), returns
  90        true on success or false on failure and logs the appropriate error
  91        message in the latter case.
  92        @param nameOfISP optional paramater for dial program
  93        @param username unused
  94        @param password unused
  95    */
  96    virtual bool Dial(const wxString& nameOfISP,
  97                      const wxString& WXUNUSED(username),
  98                      const wxString& WXUNUSED(password),
  99                      bool async);
 100
 101    // Hang up the currently active dial up connection.
 102    virtual bool HangUp();
 103
 104    // returns true if the computer is connected to the network: under Windows,
 105    // this just means that a RAS connection exists, under Unix we check that
 106    // the "well-known host" (as specified by SetWellKnownHost) is reachable
 107    virtual bool IsOnline() const
 108       {
 109          CheckStatus();
 110          return m_IsOnline == Net_Connected;
 111       }
 112
 113    // do we have a constant net connection?
 114    virtual bool IsAlwaysOnline() const;
 115
 116    // returns true if (async) dialing is in progress
 117    virtual bool IsDialing() const
 118       { return m_DialProcess != NULL; }
 119
 120    // cancel dialing the number initiated with Dial(async = true)
 121    // NB: this won't result in DISCONNECTED event being sent
 122    virtual bool CancelDialing();
 123
 124    size_t GetISPNames(class wxArrayString &) const
 125       { return 0; }
 126
 127    // sometimes the built-in logic for determining the online status may fail,
 128    // so, in general, the user should be allowed to override it. This function
 129    // allows to forcefully set the online status - whatever our internal
 130    // algorithm may think about it.
 131    virtual void SetOnlineStatus(bool isOnline = true)
 132       { m_IsOnline = isOnline ? Net_Connected : Net_No; }
 133
 134    // set misc wxDialUpManager options
 135    // --------------------------------
 136
 137    // enable automatical checks for the connection status and sending of
 138    // wxEVT_DIALUP_CONNECTED/wxEVT_DIALUP_DISCONNECTED events. The interval
 139    // parameter is only for Unix where we do the check manually: under
 140    // Windows, the notification about the change of connection status is
 141    // instantenous.
 142    //
 143    // Returns false if couldn't set up automatic check for online status.
 144    virtual bool EnableAutoCheckOnlineStatus(size_t nSeconds);
 145
 146    // disable automatic check for connection status change - notice that the
 147    // wxEVT_DIALUP_XXX events won't be sent any more neither.
 148    virtual void DisableAutoCheckOnlineStatus();
 149
 150    // under Unix, the value of well-known host is used to check whether we're
 151    // connected to the internet. It's unused under Windows, but this function
 152    // is always safe to call. The default value is www.yahoo.com.
 153    virtual void SetWellKnownHost(const wxString& hostname,
 154                                  int portno = 80);
 155    /** Sets the commands to start up the network and to hang up
 156        again. Used by the Unix implementations only.
 157    */
 158    virtual void SetConnectCommand(const wxString &command, const wxString &hupcmd)
 159       { m_ConnectCommand = command; m_HangUpCommand = hupcmd; }
 160
 161 //private: -- Sun CC 4.2 objects to using NetConnection enum as the return
 162 //            type if it is declared private
 163
 164    // the possible results of testing for Online() status
 165    enum NetConnection
 166    {
 167        Net_Unknown = -1,    // we couldn't learn anything
 168        Net_No,              // no network connection [currently]
 169        Net_Connected        // currently connected
 170    };
 171
 172    // the possible net connection types
 173    enum NetDeviceType
 174    {
 175        NetDevice_None    = 0x0000,  // no network devices (authoritative)
 176        NetDevice_Unknown = 0x0001,  // test doesn't work on this OS
 177        NetDevice_Modem   = 0x0002,  // we have a modem
 178        NetDevice_LAN     = 0x0004   //         a network card
 179    };
 180
 181 private:
 182    // the current status
 183    NetConnection m_IsOnline;
 184
 185    // the connection we have with the network card
 186    NetConnection m_connCard;
 187
 188    // Can we use ifconfig to list active devices?
 189    int m_CanUseIfconfig;
 190
 191    // The path to ifconfig
 192    wxString m_IfconfigPath;
 193
 194    //  Can we use ping to find hosts?
 195    int m_CanUsePing;
 196    // The path to ping program
 197    wxString m_PingPath;
 198
 199    // beacon host:
 200    wxString m_BeaconHost;
 201    // beacon host portnumber for connect:
 202    int m_BeaconPort;
 203
 204    // command to connect to network
 205    wxString m_ConnectCommand;
 206    // command to hang up
 207    wxString m_HangUpCommand;
 208    // name of ISP
 209    wxString m_ISPname;
 210    // a timer for regular testing
 211    class AutoCheckTimer *m_timer;
 212    friend class AutoCheckTimer;
 213
 214    // a wxProcess for dialling in background
 215    class wxDialProcess *m_DialProcess;
 216    // pid of dial process
 217    int m_DialPId;
 218    friend class wxDialProcess;
 219
 220    // determine status
 221    void CheckStatus(bool fromAsync = false) const;
 222
 223    // real status check
 224    void CheckStatusInternal();
 225
 226    // check /proc/net (Linux only) for ppp/eth interfaces, returns the bit
 227    // mask of NetDeviceType constants
 228    int CheckProcNet();
 229
 230    // check output of ifconfig command for PPP/SLIP/PLIP devices, returns the
 231    // bit mask of NetDeviceType constants
 232    int CheckIfconfig();
 233
 234    // combines the 2 possible checks for determining the connection status
 235    NetConnection CheckConnectAndPing();
 236
 237    // pings a host
 238    NetConnection CheckPing();
 239
 240    // check by connecting to host on given port.
 241    NetConnection CheckConnect();
 242 };
 243
 244
 245 class AutoCheckTimer : public wxTimer
 246 {
 247 public:
 248    AutoCheckTimer(wxDialUpManagerImpl *dupman)
 249    {
 250        m_dupman = dupman;
 251    }
 252
 253    virtual void Notify()
 254    {
 255        wxLogTrace(_T("dialup"), wxT("Checking dial up network status."));
 256
 257        m_dupman->CheckStatus();
 258    }
 259
 260 public:
 261    wxDialUpManagerImpl *m_dupman;
 262 };
 263
 264 class wxDialProcess : public wxProcess
 265 {
 266 public:
 267    wxDialProcess(wxDialUpManagerImpl *dupman)
 268       {
 269          m_DupMan = dupman;
 270       }
 271    void Disconnect() { m_DupMan = NULL; }
 272    virtual void OnTerminate(int WXUNUSED(pid), int WXUNUSED(status))
 273       {
 274          if(m_DupMan)
 275          {
 276             m_DupMan->m_DialProcess = NULL;
 277             m_DupMan->CheckStatus(true);
 278          }
 279       }
 280 private:
 281       wxDialUpManagerImpl *m_DupMan;
 282 };
 283
 284
 285 wxDialUpManagerImpl::wxDialUpManagerImpl()
 286 {
 287    m_IsOnline =
 288    m_connCard = Net_Unknown;
 289    m_DialProcess = NULL;
 290    m_timer = NULL;
 291    m_CanUseIfconfig = -1; // unknown
 292    m_CanUsePing = -1; // unknown
 293    m_BeaconHost = WXDIALUP_MANAGER_DEFAULT_BEACONHOST;
 294    m_BeaconPort = 80;
 295
 296 #ifdef __SGI__
 297    m_ConnectCommand = _T("/usr/etc/ppp");
 298 #elif defined(__LINUX__)
 299    // default values for Debian/GNU linux
 300    m_ConnectCommand = _T("pon");
 301    m_HangUpCommand = _T("poff");
 302 #endif
 303
 304    wxChar * dial = wxGetenv(_T("WXDIALUP_DIALCMD"));
 305    wxChar * hup = wxGetenv(_T("WXDIALUP_HUPCMD"));
 306    SetConnectCommand(dial ? wxString(dial) : m_ConnectCommand,
 307                      hup ? wxString(hup) : m_HangUpCommand);
 308 }
 309
 310 wxDialUpManagerImpl::~wxDialUpManagerImpl()
 311 {
 312    if(m_timer) delete m_timer;
 313    if(m_DialProcess)
 314    {
 315       m_DialProcess->Disconnect();
 316       m_DialProcess->Detach();
 317    }
 318 }
 319
 320 bool
 321 wxDialUpManagerImpl::Dial(const wxString &isp,
 322                           const wxString & WXUNUSED(username),
 323                           const wxString & WXUNUSED(password),
 324                           bool async)
 325 {
 326     if(m_IsOnline == Net_Connected)
 327         return false;
 328     m_ISPname = isp;
 329     wxString cmd;
 330     if(m_ConnectCommand.Find(wxT("%s")))
 331         cmd.Printf(m_ConnectCommand,m_ISPname.c_str());
 332     else
 333         cmd = m_ConnectCommand;
 334
 335     if ( async )
 336     {
 337         m_DialProcess = new wxDialProcess(this);
 338         m_DialPId = (int)wxExecute(cmd, false, m_DialProcess);
 339         if(m_DialPId == 0)
 340         {
 341             delete m_DialProcess;
 342             m_DialProcess = NULL;
 343             return false;
 344         }
 345         else
 346             return true;
 347     }
 348     else
 349         return wxExecute(cmd, /* sync */ true) == 0;
 350 }
 351
 352 bool wxDialUpManagerImpl::HangUp()
 353 {
 354     if(m_IsOnline == Net_No)
 355         return false;
 356     if(IsDialing())
 357     {
 358         wxLogError(_("Already dialling ISP."));
 359         return false;
 360     }
 361     wxString cmd;
 362     if(m_HangUpCommand.Find(wxT("%s")))
 363         cmd.Printf(m_HangUpCommand,m_ISPname.c_str(), m_DialProcess);
 364     else
 365         cmd = m_HangUpCommand;
 366     return wxExecute(cmd, /* sync */ true) == 0;
 367 }
 368
 369
 370 bool wxDialUpManagerImpl::CancelDialing()
 371 {
 372    if(! IsDialing())
 373       return false;
 374    return kill(m_DialPId, SIGTERM) > 0;
 375 }
 376
 377 bool wxDialUpManagerImpl::EnableAutoCheckOnlineStatus(size_t nSeconds)
 378 {
 379    DisableAutoCheckOnlineStatus();
 380    m_timer = new AutoCheckTimer(this);
 381    bool rc = m_timer->Start(nSeconds*1000);
 382    if(! rc)
 383    {
 384       delete m_timer;
 385       m_timer = NULL;
 386    }
 387    return rc;
 388 }
 389
 390 void wxDialUpManagerImpl::DisableAutoCheckOnlineStatus()
 391 {
 392    if(m_timer != NULL)
 393    {
 394       m_timer->Stop();
 395       delete m_timer;
 396       m_timer = NULL;
 397    }
 398 }
 399
 400
 401 void wxDialUpManagerImpl::SetWellKnownHost(const wxString& hostname, int portno)
 402 {
 403    if(hostname.Length() == 0)
 404    {
 405       m_BeaconHost = WXDIALUP_MANAGER_DEFAULT_BEACONHOST;
 406       m_BeaconPort = 80;
 407       return;
 408    }
 409
 410    // does hostname contain a port number?
 411    wxString port = hostname.After(wxT(':'));
 412    if(port.Length())
 413    {
 414       m_BeaconHost = hostname.Before(wxT(':'));
 415       m_BeaconPort = wxAtoi(port);
 416    }
 417    else
 418    {
 419       m_BeaconHost = hostname;
 420       m_BeaconPort = portno;
 421    }
 422 }
 423
 424
 425 void wxDialUpManagerImpl::CheckStatus(bool fromAsync) const
 426 {
 427     // This function calls the CheckStatusInternal() helper function
 428     // which is OS - specific and then sends the events.
 429
 430     NetConnection oldIsOnline = m_IsOnline;
 431     ( /* non-const */ (wxDialUpManagerImpl *)this)->CheckStatusInternal();
 432
 433     // now send the events as appropriate: i.e. if the status changed and
 434     // if we're in defined state
 435     if(m_IsOnline != oldIsOnline
 436             && m_IsOnline != Net_Unknown
 437             && oldIsOnline != Net_Unknown )
 438     {
 439         wxDialUpEvent event(m_IsOnline == Net_Connected, ! fromAsync);
 440         (void)wxTheApp->ProcessEvent(event);
 441     }
 442 }
 443
 444 /*
 445    We first try to find out if ppp interface is active. If it is, we assume
 446    that we're online but don't have a permanent connection (this is false if a
 447    networked machine uses modem to connect to somewhere else, but we can't do
 448    anything in this case anyhow).
 449
 450    If no ppp interface is detected, we check for eth interface. If it is
 451    found, we check that we can, indeed, connect to an Internet host. The logic
 452    here is that connection check should be fast enough in this case and we
 453    don't want to give false positives in a (common) case of a machine on a LAN
 454    which is not connected to the outside.
 455
 456    If we didn't find either ppp or eth interfaces, we stop here and decide
 457    that we're connected. However, if couldn't check for this, we try to ping a
 458    remote host just in case.
 459
 460    NB1: Checking for the interface presence can be done in 2 ways
 461         a) reading /proc/net/dev under Linux
 462         b) spawning ifconfig under any OS
 463
 464         The first method is faster but only works under Linux.
 465
 466    NB2: pinging, actually, means that we first try to connect "manually" to
 467         a port on remove machine and if it fails, we run ping.
 468 */
 469
 470 void wxDialUpManagerImpl::CheckStatusInternal()
 471 {
 472     m_IsOnline = Net_Unknown;
 473
 474     // first do quick checks to determine what kind of network devices do we
 475     // have
 476     int netDeviceType = CheckProcNet();
 477     if ( netDeviceType == NetDevice_Unknown )
 478     {
 479         // nothing found, try ifconfig too
 480         netDeviceType = CheckIfconfig();
 481     }
 482
 483     switch ( netDeviceType )
 484     {
 485         case NetDevice_None:
 486             // no network devices, no connection
 487             m_IsOnline = Net_No;
 488             break;
 489
 490         case NetDevice_LAN:
 491             // we still do ping to confirm that we're connected but we only do
 492             // it once and hope that the purpose of the network card (i.e.
 493             // whether it used for connecting to the Internet or just to a
 494             // LAN) won't change during the program lifetime
 495             if ( m_connCard == Net_Unknown )
 496             {
 497                 m_connCard = CheckConnectAndPing();
 498             }
 499             m_IsOnline = m_connCard;
 500             break;
 501
 502         case NetDevice_Unknown:
 503             // try to ping just in case
 504             m_IsOnline = CheckConnectAndPing();
 505             break;
 506
 507         case NetDevice_LAN + NetDevice_Modem:
 508         case NetDevice_Modem:
 509             // assume we're connected
 510             m_IsOnline = Net_Connected;
 511             break;
 512
 513         default:
 514             wxFAIL_MSG(_T("Unexpected netDeviceType"));
 515     }
 516 }
 517
 518 bool wxDialUpManagerImpl::IsAlwaysOnline() const
 519 {
 520     wxDialUpManagerImpl *self = wxConstCast(this, wxDialUpManagerImpl);
 521
 522     int netDeviceType = self->CheckProcNet();
 523     if ( netDeviceType == NetDevice_Unknown )
 524     {
 525         // nothing found, try ifconfig too
 526         netDeviceType = self->CheckIfconfig();
 527     }
 528
 529     if ( netDeviceType == NetDevice_Unknown )
 530     {
 531         // this is the only thing we can do unfortunately...
 532         self->HangUp();
 533         return IsOnline();
 534     }
 535     else
 536     {
 537         // we are only permanently online if we have a network card
 538         return (netDeviceType & NetDevice_LAN) != 0;
 539     }
 540 }
 541
 542 wxDialUpManagerImpl::NetConnection wxDialUpManagerImpl::CheckConnectAndPing()
 543 {
 544     NetConnection conn;
 545
 546     // first try connecting - faster
 547     conn = CheckConnect();
 548     if ( conn == Net_Unknown )
 549     {
 550         // try pinging too
 551         conn = CheckPing();
 552     }
 553
 554     return conn;
 555 }
 556
 557 wxDialUpManagerImpl::NetConnection wxDialUpManagerImpl::CheckConnect()
 558 {
 559    // second method: try to connect to a well known host:
 560    // This can be used under Win 9x, too!
 561    struct hostent     *hp;
 562    struct sockaddr_in  serv_addr;
 563
 564    if((hp = gethostbyname(m_BeaconHost.mb_str())) == NULL)
 565       return Net_No; // no DNS no net
 566
 567    serv_addr.sin_family = hp->h_addrtype;
 568    memcpy(&serv_addr.sin_addr,hp->h_addr, hp->h_length);
 569    serv_addr.sin_port = htons(m_BeaconPort);
 570
 571    int sockfd;
 572    if( ( sockfd = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0)
 573    {
 574       return Net_Unknown;  // no info
 575    }
 576
 577    if( connect(sockfd, (struct sockaddr *) &serv_addr,
 578                sizeof(serv_addr)) >= 0)
 579    {
 580       close(sockfd);
 581       return Net_Connected; // we can connect, so we have a network!
 582    }
 583    else // failed to connect
 584    {
 585        if(errno == ENETUNREACH)
 586           return Net_No; // network is unreachable
 587        else
 588           return Net_Unknown; // connect failed, but don't know why
 589    }
 590 }
 591
 592
 593 int
 594 wxDialUpManagerImpl::CheckProcNet()
 595 {
 596     // assume that the test doesn't work
 597     int netDevice = NetDevice_Unknown;
 598
 599 #ifdef __LINUX__
 600     if (wxFileExists(_T("/proc/net/route")))
 601     {
 602         // cannot use wxFile::Length because file doesn't support seeking, so
 603         // use stdio directly
 604         FILE *f = fopen("/proc/net/route", "rt");
 605         if (f != NULL)
 606         {
 607             // now we know that we will find all devices we may have
 608             netDevice = NetDevice_None;
 609
 610             char output[256];
 611
 612             while (fgets(output, 256, f) != NULL)
 613             {
 614                 if ( strstr(output, "eth") ) // network card
 615                 {
 616                     netDevice |= NetDevice_LAN;
 617                 }
 618                 else if (strstr(output,"ppp")   // ppp
 619                         || strstr(output,"sl")  // slip
 620                         || strstr(output,"pl")) // plip
 621                 {
 622                     netDevice |= NetDevice_Modem;
 623                 }
 624             }
 625
 626             fclose(f);
 627         }
 628     }
 629 #endif // __LINUX__
 630
 631     return netDevice;
 632 }
 633
 634
 635 int
 636 wxDialUpManagerImpl::CheckIfconfig()
 637 {
 638 #ifdef __VMS
 639     m_CanUseIfconfig = 0;
 640     return -1;
 641 #else
 642     // assume that the test doesn't work
 643     int netDevice = NetDevice_Unknown;
 644
 645     // first time check for ifconfig location
 646     if ( m_CanUseIfconfig == -1 ) // unknown
 647     {
 648         static const wxChar *ifconfigLocations[] =
 649         {
 650             _T("/sbin"),         // Linux, FreeBSD, Darwin
 651             _T("/usr/sbin"),     // SunOS, Solaris, AIX, HP-UX
 652             _T("/usr/etc"),      // IRIX
 653             _T("/etc"),          // AIX 5
 654         };
 655
 656         for ( size_t n = 0; n < WXSIZEOF(ifconfigLocations); n++ )
 657         {
 658             wxString path(ifconfigLocations[n]);
 659             path << _T("/ifconfig");
 660
 661             if ( wxFileExists(path) )
 662             {
 663                 m_IfconfigPath = path;
 664                 break;
 665             }
 666         }
 667     }
 668
 669     if ( m_CanUseIfconfig != 0 ) // unknown or yes
 670     {
 671         wxLogNull ln; // suppress all error messages
 672
 673         wxASSERT_MSG( m_IfconfigPath.length(),
 674                       _T("can't use ifconfig if it wasn't found") );
 675
 676         wxString tmpfile = wxGetTempFileName( wxT("_wxdialuptest") );
 677         wxString cmd = wxT("/bin/sh -c \'");
 678         cmd << m_IfconfigPath;
 679 #if defined(__AIX__) || defined(__SOLARIS__) || defined (__SUNOS__)
 680         // need to add -a flag
 681         cmd << wxT(" -a");
 682 #elif defined(__LINUX__) || defined(__SGI__)
 683         // nothing to be added to ifconfig
 684 #elif defined(__FREEBSD__) || defined(__DARWIN__)
 685         // add -l flag
 686         cmd << wxT(" -l");
 687 #elif defined(__HPUX__)
 688         // VZ: a wild guess (but without it, ifconfig fails completely)
 689         cmd << wxT(" ppp0");
 690 #else
 691         #if defined(__GNUG__)
 692             #warning "No ifconfig information for this OS."
 693         #else
 694             #pragma warning "No ifconfig information for this OS."
 695         #endif
 696
 697         m_CanUseIfconfig = 0;
 698         return -1;
 699 #endif
 700        cmd << wxT(" >") << tmpfile <<  wxT('\'');
 701         /* I tried to add an option to wxExecute() to not close stdout,
 702            so we could let ifconfig write directly to the tmpfile, but
 703            this does not work. That should be faster, as it doesn´t call
 704            the shell first. I have no idea why. :-(  (KB) */
 705         if ( wxExecute(cmd,true /* sync */) == 0 )
 706         {
 707             m_CanUseIfconfig = 1;
 708             wxFFile file;
 709             if( file.Open(tmpfile) )
 710             {
 711                 wxString output;
 712                 if ( file.ReadAll(&output) )
 713                 {
 714                     // FIXME shouldn't we grep for "^ppp"? (VZ)
 715
 716                     bool hasModem = false,
 717                          hasLAN = false;
 718
 719 #if defined(__SOLARIS__) || defined (__SUNOS__)
 720                     // dialup device under SunOS/Solaris
 721                     hasModem = strstr(output.fn_str(),"ipdptp") != (char *)NULL;
 722                     hasLAN = strstr(output.fn_str(), "hme") != (char *)NULL;
 723 #elif defined(__LINUX__) || defined (__FREEBSD__)
 724                     hasModem = strstr(output.fn_str(),"ppp")    // ppp
 725                         || strstr(output.fn_str(),"sl")  // slip
 726                         || strstr(output.fn_str(),"pl"); // plip
 727                     hasLAN = strstr(output.fn_str(), "eth") != NULL;
 728 #elif defined(__SGI__)  // IRIX
 729                     hasModem = strstr(output, "ppp") != NULL; // PPP
 730 #elif defined(__HPUX__)
 731                     // if could run ifconfig on interface, then it exists
 732                     hasModem = true;
 733 #endif
 734
 735                     netDevice = NetDevice_None;
 736                     if ( hasModem )
 737                         netDevice |= NetDevice_Modem;
 738                     if ( hasLAN )
 739                         netDevice |= NetDevice_LAN;
 740                 }
 741                 //else: error reading the file
 742             }
 743             //else: error opening the file
 744         }
 745         else // could not run ifconfig correctly
 746         {
 747             m_CanUseIfconfig = 0; // don´t try again
 748         }
 749
 750         (void) wxRemoveFile(tmpfile);
 751     }
 752
 753     return netDevice;
 754 #endif
 755 }
 756
 757 wxDialUpManagerImpl::NetConnection wxDialUpManagerImpl::CheckPing()
 758 {
 759     // First time check for ping location. We only use the variant
 760     // which does not take arguments, a la GNU.
 761     if(m_CanUsePing == -1) // unknown
 762     {
 763 #ifdef __VMS
 764         if (wxFileExists( wxT("SYS$SYSTEM:TCPIP$PING.EXE") ))
 765             m_PingPath = wxT("$SYS$SYSTEM:TCPIP$PING");
 766 #elif defined(__AIX__)
 767         m_PingPath = _T("/etc/ping");
 768 #elif defined(__SGI__)
 769         m_PingPath = _T("/usr/etc/ping");
 770 #else
 771         if (wxFileExists( wxT("/bin/ping") ))
 772             m_PingPath = wxT("/bin/ping");
 773         else if (wxFileExists( wxT("/usr/sbin/ping") ))
 774             m_PingPath = wxT("/usr/sbin/ping");
 775 #endif
 776         if (!m_PingPath)
 777         {
 778             m_CanUsePing = 0;
 779         }
 780     }
 781
 782     if(! m_CanUsePing)
 783     {
 784        // we didn't find ping
 785        return Net_Unknown;
 786     }
 787
 788     wxLogNull ln; // suppress all error messages
 789     wxASSERT(m_PingPath.length());
 790     wxString cmd;
 791     cmd << m_PingPath << wxT(' ');
 792 #if defined(__SOLARIS__) || defined (__SUNOS__)
 793     // nothing to add to ping command
 794 #elif defined(__AIX__) || defined(__LINUX__) || defined (__BSD__) || defined(__VMS) || defined(__SGI__)
 795     cmd << wxT("-c 1 "); // only ping once
 796 #elif defined(__HPUX__)
 797     cmd << wxT("64 1 "); // only ping once (need also specify the packet size)
 798 #else
 799     #if defined(__GNUG__)
 800         #warning "No Ping information for this OS."
 801     #else
 802         #pragma warning "No Ping information for this OS."
 803     #endif
 804
 805     m_CanUsePing = 0;
 806     return Net_Unknown;
 807 #endif
 808     cmd << m_BeaconHost;
 809     if(wxExecute(cmd, true /* sync */) == 0)
 810         return Net_Connected;
 811     else
 812         return Net_No;
 813 }
 814
 815 /* static */
 816 wxDialUpManager *wxDialUpManager::Create()
 817 {
 818    return new wxDialUpManagerImpl;
 819 }
 820
 821 #endif // wxUSE_DIALUP_MANAGER