src/unix/dialup.cpp

   1 // -*- c++ -*- ////////////////////////////////////////////////////////////////
   2 // Name:        src/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 #if wxUSE_DIALUP_MANAGER
  16
  17 #include "wx/dialup.h"
  18
  19 #ifndef  WX_PRECOMP
  20     #include "wx/string.h"
  21     #include "wx/intl.h"
  22     #include "wx/log.h"
  23     #include "wx/event.h"
  24     #include "wx/app.h"
  25     #include "wx/utils.h"
  26     #include "wx/timer.h"
  27 #endif // !PCH
  28
  29 #include "wx/filefn.h"
  30 #include "wx/ffile.h"
  31 #include "wx/process.h"
  32 #include "wx/crt.h"
  33
  34 #include <stdlib.h>
  35
  36 #include <signal.h>
  37 #include <fcntl.h>
  38 #include <unistd.h>
  39 #define __STRICT_ANSI__
  40 #include <sys/socket.h>
  41 #include <netdb.h>
  42 #include <netinet/in.h>
  43 #include <arpa/inet.h>
  44 #include <errno.h>
  45
  46 DEFINE_EVENT_TYPE(wxEVT_DIALUP_CONNECTED)
  47 DEFINE_EVENT_TYPE(wxEVT_DIALUP_DISCONNECTED)
  48
  49 // ----------------------------------------------------------------------------
  50 // A class which groups functions dealing with connecting to the network from a
  51 // workstation using dial-up access to the net. There is at most one instance
  52 // of this class in the program accessed via GetDialUpManager().
  53 // ----------------------------------------------------------------------------
  54
  55 /* TODO
  56  *
  57  * 1. more configurability for Unix: i.e. how to initiate the connection, how
  58  *    to check for online status, &c.
  59  * 2. add a "long Dial(long connectionId = -1)" function which asks the user
  60  *    about which connection to dial (this may be done using native dialogs
  61  *    under NT, need generic dialogs for all others) and returns the identifier
  62  *    of the selected connection (it's opaque to the application) - it may be
  63  *    reused later to dial the same connection later (or use strings instead of
  64  *    longs may be?)
  65  * 3. add an async version of dialing functions which notify the caller about
  66  *    the progress (or may be even start another thread to monitor it)
  67  * 4. the static creation/accessor functions are not MT-safe - but is this
  68  *    really crucial? I think we may suppose they're always called from the
  69  *    main thread?
  70  */
  71
  72 class WXDLLEXPORT wxDialUpManagerImpl : public wxDialUpManager
  73 {
  74 public:
  75    wxDialUpManagerImpl();
  76    virtual ~wxDialUpManagerImpl();
  77
  78    /** Could the dialup manager be initialized correctly? If this function
  79        returns false, no other functions will work neither, so it's a good idea
  80        to call this function and check its result before calling any other
  81        wxDialUpManager methods.
  82    */
  83    virtual bool IsOk() const
  84       { return true; }
  85
  86    /** The simplest way to initiate a dial up: this function dials the given
  87        ISP (exact meaning of the parameter depends on the platform), returns
  88        true on success or false on failure and logs the appropriate error
  89        message in the latter case.
  90        @param nameOfISP optional paramater for dial program
  91        @param username unused
  92        @param password unused
  93    */
  94    virtual bool Dial(const wxString& nameOfISP,
  95                      const wxString& WXUNUSED(username),
  96                      const wxString& WXUNUSED(password),
  97                      bool async);
  98
  99    // Hang up the currently active dial up connection.
 100    virtual bool HangUp();
 101
 102    // returns true if the computer is connected to the network: under Windows,
 103    // this just means that a RAS connection exists, under Unix we check that
 104    // the "well-known host" (as specified by SetWellKnownHost) is reachable
 105    virtual bool IsOnline() const
 106       {
 107          CheckStatus();
 108          return m_IsOnline == Net_Connected;
 109       }
 110
 111    // do we have a constant net connection?
 112    virtual bool IsAlwaysOnline() const;
 113
 114    // returns true if (async) dialing is in progress
 115    virtual bool IsDialing() const
 116       { return m_DialProcess != NULL; }
 117
 118    // cancel dialing the number initiated with Dial(async = true)
 119    // NB: this won't result in DISCONNECTED event being sent
 120    virtual bool CancelDialing();
 121
 122    size_t GetISPNames(class wxArrayString &) const
 123       { return 0; }
 124
 125    // sometimes the built-in logic for determining the online status may fail,
 126    // so, in general, the user should be allowed to override it. This function
 127    // allows to forcefully set the online status - whatever our internal
 128    // algorithm may think about it.
 129    virtual void SetOnlineStatus(bool isOnline = true)
 130       { m_IsOnline = isOnline ? Net_Connected : Net_No; }
 131
 132    // set misc wxDialUpManager options
 133    // --------------------------------
 134
 135    // enable automatical checks for the connection status and sending of
 136    // wxEVT_DIALUP_CONNECTED/wxEVT_DIALUP_DISCONNECTED events. The interval
 137    // parameter is only for Unix where we do the check manually: under
 138    // Windows, the notification about the change of connection status is
 139    // instantenous.
 140    //
 141    // Returns false if couldn't set up automatic check for online status.
 142    virtual bool EnableAutoCheckOnlineStatus(size_t nSeconds);
 143
 144    // disable automatic check for connection status change - notice that the
 145    // wxEVT_DIALUP_XXX events won't be sent any more neither.
 146    virtual void DisableAutoCheckOnlineStatus();
 147
 148    // under Unix, the value of well-known host is used to check whether we're
 149    // connected to the internet. It's unused under Windows, but this function
 150    // is always safe to call. The default value is www.yahoo.com.
 151    virtual void SetWellKnownHost(const wxString& hostname,
 152                                  int portno = 80);
 153    /** Sets the commands to start up the network and to hang up
 154        again. Used by the Unix implementations only.
 155    */
 156    virtual void SetConnectCommand(const wxString &command, const wxString &hupcmd)
 157       { m_ConnectCommand = command; m_HangUpCommand = hupcmd; }
 158
 159 //private: -- Sun CC 4.2 objects to using NetConnection enum as the return
 160 //            type if it is declared private
 161
 162    // the possible results of testing for Online() status
 163    enum NetConnection
 164    {
 165        Net_Unknown = -1,    // we couldn't learn anything
 166        Net_No,              // no network connection [currently]
 167        Net_Connected        // currently connected
 168    };
 169
 170    // the possible net connection types
 171    enum NetDeviceType
 172    {
 173        NetDevice_None    = 0x0000,  // no network devices (authoritative)
 174        NetDevice_Unknown = 0x0001,  // test doesn't work on this OS
 175        NetDevice_Modem   = 0x0002,  // we have a modem
 176        NetDevice_LAN     = 0x0004   //         a network card
 177    };
 178
 179 private:
 180    // the current status
 181    NetConnection m_IsOnline;
 182
 183    // the connection we have with the network card
 184    NetConnection m_connCard;
 185
 186    // Can we use ifconfig to list active devices?
 187    int m_CanUseIfconfig;
 188
 189    // The path to ifconfig
 190    wxString m_IfconfigPath;
 191
 192    //  Can we use ping to find hosts?
 193    int m_CanUsePing;
 194    // The path to ping program
 195    wxString m_PingPath;
 196
 197    // beacon host:
 198    wxString m_BeaconHost;
 199    // beacon host portnumber for connect:
 200    int m_BeaconPort;
 201
 202    // command to connect to network
 203    wxString m_ConnectCommand;
 204    // command to hang up
 205    wxString m_HangUpCommand;
 206    // name of ISP
 207    wxString m_ISPname;
 208    // a timer for regular testing
 209    class AutoCheckTimer *m_timer;
 210    friend class AutoCheckTimer;
 211
 212    // a wxProcess for dialling in background
 213    class wxDialProcess *m_DialProcess;
 214    // pid of dial process
 215    int m_DialPId;
 216    friend class wxDialProcess;
 217
 218    // determine status
 219    void CheckStatus(bool fromAsync = false) const;
 220
 221    // real status check
 222    void CheckStatusInternal();
 223
 224    // check /proc/net (Linux only) for ppp/eth interfaces, returns the bit
 225    // mask of NetDeviceType constants
 226    int CheckProcNet();
 227
 228    // check output of ifconfig command for PPP/SLIP/PLIP devices, returns the
 229    // bit mask of NetDeviceType constants
 230    int CheckIfconfig();
 231
 232    // combines the 2 possible checks for determining the connection status
 233    NetConnection CheckConnectAndPing();
 234
 235    // pings a host
 236    NetConnection CheckPing();
 237
 238    // check by connecting to host on given port.
 239    NetConnection CheckConnect();
 240 };
 241
 242
 243 class AutoCheckTimer : public wxTimer
 244 {
 245 public:
 246    AutoCheckTimer(wxDialUpManagerImpl *dupman)
 247    {
 248        m_dupman = dupman;
 249    }
 250
 251    virtual void Notify()
 252    {
 253        wxLogTrace(_T("dialup"), wxT("Checking dial up network status."));
 254
 255        m_dupman->CheckStatus();
 256    }
 257
 258 public:
 259    wxDialUpManagerImpl *m_dupman;
 260 };
 261
 262 class wxDialProcess : public wxProcess
 263 {
 264 public:
 265    wxDialProcess(wxDialUpManagerImpl *dupman)
 266       {
 267          m_DupMan = dupman;
 268       }
 269    void Disconnect() { m_DupMan = NULL; }
 270    virtual void OnTerminate(int WXUNUSED(pid), int WXUNUSED(status))
 271       {
 272          if(m_DupMan)
 273          {
 274             m_DupMan->m_DialProcess = NULL;
 275             m_DupMan->CheckStatus(true);
 276          }
 277       }
 278 private:
 279       wxDialUpManagerImpl *m_DupMan;
 280 };
 281
 282
 283 wxDialUpManagerImpl::wxDialUpManagerImpl()
 284 {
 285    m_IsOnline =
 286    m_connCard = Net_Unknown;
 287    m_DialProcess = NULL;
 288    m_timer = NULL;
 289    m_CanUseIfconfig = -1; // unknown
 290    m_CanUsePing = -1; // unknown
 291    m_BeaconHost = WXDIALUP_MANAGER_DEFAULT_BEACONHOST;
 292    m_BeaconPort = 80;
 293
 294 #ifdef __SGI__
 295    m_ConnectCommand = _T("/usr/etc/ppp");
 296 #elif defined(__LINUX__)
 297    // default values for Debian/GNU linux
 298    m_ConnectCommand = _T("pon");
 299    m_HangUpCommand = _T("poff");
 300 #endif
 301
 302    wxChar * dial = wxGetenv(_T("WXDIALUP_DIALCMD"));
 303    wxChar * hup = wxGetenv(_T("WXDIALUP_HUPCMD"));
 304    SetConnectCommand(dial ? wxString(dial) : m_ConnectCommand,
 305                      hup ? wxString(hup) : m_HangUpCommand);
 306 }
 307
 308 wxDialUpManagerImpl::~wxDialUpManagerImpl()
 309 {
 310    if(m_timer) delete m_timer;
 311    if(m_DialProcess)
 312    {
 313       m_DialProcess->Disconnect();
 314       m_DialProcess->Detach();
 315    }
 316 }
 317
 318 bool
 319 wxDialUpManagerImpl::Dial(const wxString &isp,
 320                           const wxString & WXUNUSED(username),
 321                           const wxString & WXUNUSED(password),
 322                           bool async)
 323 {
 324     if(m_IsOnline == Net_Connected)
 325         return false;
 326     m_ISPname = isp;
 327     wxString cmd;
 328     if(m_ConnectCommand.Find(wxT("%s")))
 329         cmd.Printf(m_ConnectCommand,m_ISPname.c_str());
 330     else
 331         cmd = m_ConnectCommand;
 332
 333     if ( async )
 334     {
 335         m_DialProcess = new wxDialProcess(this);
 336         m_DialPId = (int)wxExecute(cmd, false, m_DialProcess);
 337         if(m_DialPId == 0)
 338         {
 339             delete m_DialProcess;
 340             m_DialProcess = NULL;
 341             return false;
 342         }
 343         else
 344             return true;
 345     }
 346     else
 347         return wxExecute(cmd, /* sync */ true) == 0;
 348 }
 349
 350 bool wxDialUpManagerImpl::HangUp()
 351 {
 352     if(m_IsOnline == Net_No)
 353         return false;
 354     if(IsDialing())
 355     {
 356         wxLogError(_("Already dialling ISP."));
 357         return false;
 358     }
 359     wxString cmd;
 360     if(m_HangUpCommand.Find(wxT("%s")))
 361         cmd.Printf(m_HangUpCommand,m_ISPname.c_str(), m_DialProcess);
 362     else
 363         cmd = m_HangUpCommand;
 364     return wxExecute(cmd, /* sync */ true) == 0;
 365 }
 366
 367
 368 bool wxDialUpManagerImpl::CancelDialing()
 369 {
 370    if(! IsDialing())
 371       return false;
 372    return kill(m_DialPId, SIGTERM) > 0;
 373 }
 374
 375 bool wxDialUpManagerImpl::EnableAutoCheckOnlineStatus(size_t nSeconds)
 376 {
 377    DisableAutoCheckOnlineStatus();
 378    m_timer = new AutoCheckTimer(this);
 379    bool rc = m_timer->Start(nSeconds*1000);
 380    if(! rc)
 381    {
 382       delete m_timer;
 383       m_timer = NULL;
 384    }
 385    return rc;
 386 }
 387
 388 void wxDialUpManagerImpl::DisableAutoCheckOnlineStatus()
 389 {
 390    if(m_timer != NULL)
 391    {
 392       m_timer->Stop();
 393       delete m_timer;
 394       m_timer = NULL;
 395    }
 396 }
 397
 398
 399 void wxDialUpManagerImpl::SetWellKnownHost(const wxString& hostname, int portno)
 400 {
 401    if(hostname.length() == 0)
 402    {
 403       m_BeaconHost = WXDIALUP_MANAGER_DEFAULT_BEACONHOST;
 404       m_BeaconPort = 80;
 405       return;
 406    }
 407
 408    // does hostname contain a port number?
 409    wxString port = hostname.After(wxT(':'));
 410    if(port.length())
 411    {
 412       m_BeaconHost = hostname.Before(wxT(':'));
 413       m_BeaconPort = wxAtoi(port);
 414    }
 415    else
 416    {
 417       m_BeaconHost = hostname;
 418       m_BeaconPort = portno;
 419    }
 420 }
 421
 422
 423 void wxDialUpManagerImpl::CheckStatus(bool fromAsync) const
 424 {
 425     // This function calls the CheckStatusInternal() helper function
 426     // which is OS - specific and then sends the events.
 427
 428     NetConnection oldIsOnline = m_IsOnline;
 429     ( /* non-const */ (wxDialUpManagerImpl *)this)->CheckStatusInternal();
 430
 431     // now send the events as appropriate: i.e. if the status changed and
 432     // if we're in defined state
 433     if(m_IsOnline != oldIsOnline
 434             && m_IsOnline != Net_Unknown
 435             && oldIsOnline != Net_Unknown )
 436     {
 437         wxDialUpEvent event(m_IsOnline == Net_Connected, ! fromAsync);
 438         (void)wxTheApp->ProcessEvent(event);
 439     }
 440 }
 441
 442 /*
 443    We first try to find out if ppp interface is active. If it is, we assume
 444    that we're online but don't have a permanent connection (this is false if a
 445    networked machine uses modem to connect to somewhere else, but we can't do
 446    anything in this case anyhow).
 447
 448    If no ppp interface is detected, we check for eth interface. If it is
 449    found, we check that we can, indeed, connect to an Internet host. The logic
 450    here is that connection check should be fast enough in this case and we
 451    don't want to give false positives in a (common) case of a machine on a LAN
 452    which is not connected to the outside.
 453
 454    If we didn't find either ppp or eth interfaces, we stop here and decide
 455    that we're connected. However, if couldn't check for this, we try to ping a
 456    remote host just in case.
 457
 458    NB1: Checking for the interface presence can be done in 2 ways
 459         a) reading /proc/net/dev under Linux
 460         b) spawning ifconfig under any OS
 461
 462         The first method is faster but only works under Linux.
 463
 464    NB2: pinging, actually, means that we first try to connect "manually" to
 465         a port on remove machine and if it fails, we run ping.
 466 */
 467
 468 void wxDialUpManagerImpl::CheckStatusInternal()
 469 {
 470     m_IsOnline = Net_Unknown;
 471
 472     // first do quick checks to determine what kind of network devices do we
 473     // have
 474     int netDeviceType = CheckProcNet();
 475     if ( netDeviceType == NetDevice_Unknown )
 476     {
 477         // nothing found, try ifconfig too
 478         netDeviceType = CheckIfconfig();
 479     }
 480
 481     switch ( netDeviceType )
 482     {
 483         case NetDevice_None:
 484             // no network devices, no connection
 485             m_IsOnline = Net_No;
 486             break;
 487
 488         case NetDevice_LAN:
 489             // we still do ping to confirm that we're connected but we only do
 490             // it once and hope that the purpose of the network card (i.e.
 491             // whether it used for connecting to the Internet or just to a
 492             // LAN) won't change during the program lifetime
 493             if ( m_connCard == Net_Unknown )
 494             {
 495                 m_connCard = CheckConnectAndPing();
 496             }
 497             m_IsOnline = m_connCard;
 498             break;
 499
 500         case NetDevice_Unknown:
 501             // try to ping just in case
 502             m_IsOnline = CheckConnectAndPing();
 503             break;
 504
 505         case NetDevice_LAN + NetDevice_Modem:
 506         case NetDevice_Modem:
 507             // assume we're connected
 508             m_IsOnline = Net_Connected;
 509             break;
 510
 511         default:
 512             wxFAIL_MSG(_T("Unexpected netDeviceType"));
 513     }
 514 }
 515
 516 bool wxDialUpManagerImpl::IsAlwaysOnline() const
 517 {
 518     wxDialUpManagerImpl *self = wxConstCast(this, wxDialUpManagerImpl);
 519
 520     int netDeviceType = self->CheckProcNet();
 521     if ( netDeviceType == NetDevice_Unknown )
 522     {
 523         // nothing found, try ifconfig too
 524         netDeviceType = self->CheckIfconfig();
 525     }
 526
 527     if ( netDeviceType == NetDevice_Unknown )
 528     {
 529         // this is the only thing we can do unfortunately...
 530         self->HangUp();
 531         return IsOnline();
 532     }
 533     else
 534     {
 535         // we are only permanently online if we have a network card
 536         return (netDeviceType & NetDevice_LAN) != 0;
 537     }
 538 }
 539
 540 wxDialUpManagerImpl::NetConnection wxDialUpManagerImpl::CheckConnectAndPing()
 541 {
 542     NetConnection conn;
 543
 544     // first try connecting - faster
 545     conn = CheckConnect();
 546     if ( conn == Net_Unknown )
 547     {
 548         // try pinging too
 549         conn = CheckPing();
 550     }
 551
 552     return conn;
 553 }
 554
 555 wxDialUpManagerImpl::NetConnection wxDialUpManagerImpl::CheckConnect()
 556 {
 557    // second method: try to connect to a well known host:
 558    // This can be used under Win 9x, too!
 559    struct hostent     *hp;
 560    struct sockaddr_in  serv_addr;
 561
 562    if((hp = gethostbyname(m_BeaconHost.mb_str())) == NULL)
 563       return Net_No; // no DNS no net
 564
 565    serv_addr.sin_family = hp->h_addrtype;
 566    memcpy(&serv_addr.sin_addr,hp->h_addr, hp->h_length);
 567    serv_addr.sin_port = htons(m_BeaconPort);
 568
 569    int sockfd;
 570    if( ( sockfd = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0)
 571    {
 572       return Net_Unknown;  // no info
 573    }
 574
 575    if( connect(sockfd, (struct sockaddr *) &serv_addr,
 576                sizeof(serv_addr)) >= 0)
 577    {
 578       close(sockfd);
 579       return Net_Connected; // we can connect, so we have a network!
 580    }
 581    else // failed to connect
 582    {
 583 #ifdef ENETUNREACH
 584        if(errno == ENETUNREACH)
 585           return Net_No; // network is unreachable
 586        else
 587 #endif
 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__) || \
 680     defined(__OSF__) || \
 681     defined(__SOLARIS__) || defined (__SUNOS__)
 682         // need to add -a flag
 683         cmd << wxT(" -a");
 684 #elif defined(__LINUX__) || defined(__SGI__)
 685         // nothing to be added to ifconfig
 686 #elif defined(__FREEBSD__) || defined(__DARWIN__)
 687         // add -l flag
 688         cmd << wxT(" -l");
 689 #elif defined(__HPUX__)
 690         // VZ: a wild guess (but without it, ifconfig fails completely)
 691         cmd << wxT(" ppp0");
 692 #else
 693         #if defined(__GNUG__)
 694             #warning "No ifconfig information for this OS."
 695         #else
 696             #pragma warning "No ifconfig information for this OS."
 697         #endif
 698
 699         m_CanUseIfconfig = 0;
 700         return -1;
 701 #endif
 702        cmd << wxT(" >") << tmpfile <<  wxT('\'');
 703         /* I tried to add an option to wxExecute() to not close stdout,
 704            so we could let ifconfig write directly to the tmpfile, but
 705            this does not work. That should be faster, as it doesn´t call
 706            the shell first. I have no idea why. :-(  (KB) */
 707         if ( wxExecute(cmd,true /* sync */) == 0 )
 708         {
 709             m_CanUseIfconfig = 1;
 710             wxFFile file;
 711             if( file.Open(tmpfile) )
 712             {
 713                 wxString output;
 714                 if ( file.ReadAll(&output) )
 715                 {
 716                     // FIXME shouldn't we grep for "^ppp"? (VZ)
 717
 718                     bool hasModem = false,
 719                          hasLAN = false;
 720
 721 #if defined(__SOLARIS__) || defined (__SUNOS__)
 722                     // dialup device under SunOS/Solaris
 723                     hasModem = strstr(output.fn_str(),"ipdptp") != (char *)NULL;
 724                     hasLAN = strstr(output.fn_str(), "hme") != (char *)NULL;
 725 #elif defined(__LINUX__) || defined (__FREEBSD__)
 726                     hasModem = strstr(output.fn_str(),"ppp")    // ppp
 727                         || strstr(output.fn_str(),"sl")  // slip
 728                         || strstr(output.fn_str(),"pl"); // plip
 729                     hasLAN = strstr(output.fn_str(), "eth") != NULL;
 730 #elif defined(__SGI__)  // IRIX
 731                     hasModem = strstr(output.fn_str(), "ppp") != NULL; // PPP
 732 #elif defined(__HPUX__)
 733                     // if could run ifconfig on interface, then it exists
 734                     hasModem = true;
 735 #endif
 736
 737                     netDevice = NetDevice_None;
 738                     if ( hasModem )
 739                         netDevice |= NetDevice_Modem;
 740                     if ( hasLAN )
 741                         netDevice |= NetDevice_LAN;
 742                 }
 743                 //else: error reading the file
 744             }
 745             //else: error opening the file
 746         }
 747         else // could not run ifconfig correctly
 748         {
 749             m_CanUseIfconfig = 0; // don´t try again
 750         }
 751
 752         (void) wxRemoveFile(tmpfile);
 753     }
 754
 755     return netDevice;
 756 #endif
 757 }
 758
 759 wxDialUpManagerImpl::NetConnection wxDialUpManagerImpl::CheckPing()
 760 {
 761     // First time check for ping location. We only use the variant
 762     // which does not take arguments, a la GNU.
 763     if(m_CanUsePing == -1) // unknown
 764     {
 765 #ifdef __VMS
 766         if (wxFileExists( wxT("SYS$SYSTEM:TCPIP$PING.EXE") ))
 767             m_PingPath = wxT("$SYS$SYSTEM:TCPIP$PING");
 768 #elif defined(__AIX__)
 769         m_PingPath = _T("/etc/ping");
 770 #elif defined(__SGI__)
 771         m_PingPath = _T("/usr/etc/ping");
 772 #else
 773         if (wxFileExists( wxT("/bin/ping") ))
 774             m_PingPath = wxT("/bin/ping");
 775         else if (wxFileExists( wxT("/usr/sbin/ping") ))
 776             m_PingPath = wxT("/usr/sbin/ping");
 777 #endif
 778         if (!m_PingPath)
 779         {
 780             m_CanUsePing = 0;
 781         }
 782     }
 783
 784     if(! m_CanUsePing)
 785     {
 786        // we didn't find ping
 787        return Net_Unknown;
 788     }
 789
 790     wxLogNull ln; // suppress all error messages
 791     wxASSERT(m_PingPath.length());
 792     wxString cmd;
 793     cmd << m_PingPath << wxT(' ');
 794 #if defined(__SOLARIS__) || defined (__SUNOS__)
 795     // nothing to add to ping command
 796 #elif defined(__AIX__) || \
 797       defined (__BSD__) || \
 798       defined(__LINUX__) || \
 799       defined(__OSF__) || \
 800       defined(__SGI__) || \
 801       defined(__VMS)
 802     cmd << wxT("-c 1 "); // only ping once
 803 #elif defined(__HPUX__)
 804     cmd << wxT("64 1 "); // only ping once (need also specify the packet size)
 805 #else
 806     #if defined(__GNUG__)
 807         #warning "No Ping information for this OS."
 808     #else
 809         #pragma warning "No Ping information for this OS."
 810     #endif
 811
 812     m_CanUsePing = 0;
 813     return Net_Unknown;
 814 #endif
 815     cmd << m_BeaconHost;
 816     if(wxExecute(cmd, true /* sync */) == 0)
 817         return Net_Connected;
 818     else
 819         return Net_No;
 820 }
 821
 822 /* static */
 823 wxDialUpManager *wxDialUpManager::Create()
 824 {
 825    return new wxDialUpManagerImpl;
 826 }
 827
 828 #endif // wxUSE_DIALUP_MANAGER