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/filename.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 wxDEFINE_EVENT( wxEVT_DIALUP_CONNECTED, wxDialUpEvent );
  47 wxDEFINE_EVENT( wxEVT_DIALUP_DISCONNECTED, wxDialUpEvent );
  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(wxT("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 = wxT("/usr/etc/ppp");
 296 #elif defined(__LINUX__)
 297    // default values for Debian/GNU linux
 298    m_ConnectCommand = wxT("pon");
 299    m_HangUpCommand = wxT("poff");
 300 #endif
 301
 302    wxChar * dial = wxGetenv(wxT("WXDIALUP_DIALCMD"));
 303    wxChar * hup = wxGetenv(wxT("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             wxDELETE(m_DialProcess);
 340             return false;
 341         }
 342         else
 343             return true;
 344     }
 345     else
 346         return wxExecute(cmd, /* sync */ true) == 0;
 347 }
 348
 349 bool wxDialUpManagerImpl::HangUp()
 350 {
 351     if(m_IsOnline == Net_No)
 352         return false;
 353     if(IsDialing())
 354     {
 355         wxLogError(_("Already dialling ISP."));
 356         return false;
 357     }
 358     wxString cmd;
 359     if(m_HangUpCommand.Find(wxT("%s")))
 360         cmd.Printf(m_HangUpCommand,m_ISPname.c_str(), m_DialProcess);
 361     else
 362         cmd = m_HangUpCommand;
 363     return wxExecute(cmd, /* sync */ true) == 0;
 364 }
 365
 366
 367 bool wxDialUpManagerImpl::CancelDialing()
 368 {
 369    if(! IsDialing())
 370       return false;
 371    return kill(m_DialPId, SIGTERM) > 0;
 372 }
 373
 374 bool wxDialUpManagerImpl::EnableAutoCheckOnlineStatus(size_t nSeconds)
 375 {
 376    DisableAutoCheckOnlineStatus();
 377    m_timer = new AutoCheckTimer(this);
 378    bool rc = m_timer->Start(nSeconds*1000);
 379    if(! rc)
 380    {
 381       wxDELETE(m_timer);
 382    }
 383    return rc;
 384 }
 385
 386 void wxDialUpManagerImpl::DisableAutoCheckOnlineStatus()
 387 {
 388    if(m_timer != NULL)
 389    {
 390       m_timer->Stop();
 391       wxDELETE(m_timer);
 392    }
 393 }
 394
 395
 396 void wxDialUpManagerImpl::SetWellKnownHost(const wxString& hostname, int portno)
 397 {
 398    if( hostname.empty() )
 399    {
 400       m_BeaconHost = WXDIALUP_MANAGER_DEFAULT_BEACONHOST;
 401       m_BeaconPort = 80;
 402       return;
 403    }
 404
 405    // does hostname contain a port number?
 406    wxString port = hostname.After(wxT(':'));
 407    if( !port.empty() )
 408    {
 409       m_BeaconHost = hostname.Before(wxT(':'));
 410       m_BeaconPort = wxAtoi(port);
 411    }
 412    else
 413    {
 414       m_BeaconHost = hostname;
 415       m_BeaconPort = portno;
 416    }
 417 }
 418
 419
 420 void wxDialUpManagerImpl::CheckStatus(bool fromAsync) const
 421 {
 422     // This function calls the CheckStatusInternal() helper function
 423     // which is OS - specific and then sends the events.
 424
 425     NetConnection oldIsOnline = m_IsOnline;
 426     ( /* non-const */ (wxDialUpManagerImpl *)this)->CheckStatusInternal();
 427
 428     // now send the events as appropriate: i.e. if the status changed and
 429     // if we're in defined state
 430     if(m_IsOnline != oldIsOnline
 431             && m_IsOnline != Net_Unknown
 432             && oldIsOnline != Net_Unknown )
 433     {
 434         wxDialUpEvent event(m_IsOnline == Net_Connected, ! fromAsync);
 435         (void)wxTheApp->ProcessEvent(event);
 436     }
 437 }
 438
 439 /*
 440    We first try to find out if ppp interface is active. If it is, we assume
 441    that we're online but don't have a permanent connection (this is false if a
 442    networked machine uses modem to connect to somewhere else, but we can't do
 443    anything in this case anyhow).
 444
 445    If no ppp interface is detected, we check for eth interface. If it is
 446    found, we check that we can, indeed, connect to an Internet host. The logic
 447    here is that connection check should be fast enough in this case and we
 448    don't want to give false positives in a (common) case of a machine on a LAN
 449    which is not connected to the outside.
 450
 451    If we didn't find either ppp or eth interfaces, we stop here and decide
 452    that we're connected. However, if couldn't check for this, we try to ping a
 453    remote host just in case.
 454
 455    NB1: Checking for the interface presence can be done in 2 ways
 456         a) reading /proc/net/dev under Linux
 457         b) spawning ifconfig under any OS
 458
 459         The first method is faster but only works under Linux.
 460
 461    NB2: pinging, actually, means that we first try to connect "manually" to
 462         a port on remove machine and if it fails, we run ping.
 463 */
 464
 465 void wxDialUpManagerImpl::CheckStatusInternal()
 466 {
 467     m_IsOnline = Net_Unknown;
 468
 469     // first do quick checks to determine what kind of network devices do we
 470     // have
 471     int netDeviceType = CheckProcNet();
 472     if ( netDeviceType == NetDevice_Unknown )
 473     {
 474         // nothing found, try ifconfig too
 475         netDeviceType = CheckIfconfig();
 476     }
 477
 478     switch ( netDeviceType )
 479     {
 480         case NetDevice_None:
 481             // no network devices, no connection
 482             m_IsOnline = Net_No;
 483             break;
 484
 485         case NetDevice_LAN:
 486             // we still do ping to confirm that we're connected but we only do
 487             // it once and hope that the purpose of the network card (i.e.
 488             // whether it used for connecting to the Internet or just to a
 489             // LAN) won't change during the program lifetime
 490             if ( m_connCard == Net_Unknown )
 491             {
 492                 m_connCard = CheckConnectAndPing();
 493             }
 494             m_IsOnline = m_connCard;
 495             break;
 496
 497         case NetDevice_Unknown:
 498             // try to ping just in case
 499             m_IsOnline = CheckConnectAndPing();
 500             break;
 501
 502         case NetDevice_LAN + NetDevice_Modem:
 503         case NetDevice_Modem:
 504             // assume we're connected
 505             m_IsOnline = Net_Connected;
 506             break;
 507
 508         default:
 509             wxFAIL_MSG(wxT("Unexpected netDeviceType"));
 510     }
 511 }
 512
 513 bool wxDialUpManagerImpl::IsAlwaysOnline() const
 514 {
 515     wxDialUpManagerImpl *self = wxConstCast(this, wxDialUpManagerImpl);
 516
 517     int netDeviceType = self->CheckProcNet();
 518     if ( netDeviceType == NetDevice_Unknown )
 519     {
 520         // nothing found, try ifconfig too
 521         netDeviceType = self->CheckIfconfig();
 522     }
 523
 524     if ( netDeviceType == NetDevice_Unknown )
 525     {
 526         // this is the only thing we can do unfortunately...
 527         self->HangUp();
 528         return IsOnline();
 529     }
 530     else
 531     {
 532         // we are only permanently online if we have a network card
 533         return (netDeviceType & NetDevice_LAN) != 0;
 534     }
 535 }
 536
 537 wxDialUpManagerImpl::NetConnection wxDialUpManagerImpl::CheckConnectAndPing()
 538 {
 539     NetConnection conn;
 540
 541     // first try connecting - faster
 542     conn = CheckConnect();
 543     if ( conn == Net_Unknown )
 544     {
 545         // try pinging too
 546         conn = CheckPing();
 547     }
 548
 549     return conn;
 550 }
 551
 552 wxDialUpManagerImpl::NetConnection wxDialUpManagerImpl::CheckConnect()
 553 {
 554    // second method: try to connect to a well known host:
 555    // This can be used under Win 9x, too!
 556    struct hostent     *hp;
 557    struct sockaddr_in  serv_addr;
 558
 559    if((hp = gethostbyname(m_BeaconHost.mb_str())) == NULL)
 560       return Net_No; // no DNS no net
 561
 562    serv_addr.sin_family = hp->h_addrtype;
 563    memcpy(&serv_addr.sin_addr,hp->h_addr, hp->h_length);
 564    serv_addr.sin_port = htons(m_BeaconPort);
 565
 566    int sockfd;
 567    if( ( sockfd = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0)
 568    {
 569       return Net_Unknown;  // no info
 570    }
 571
 572    if( connect(sockfd, (struct sockaddr *) &serv_addr,
 573                sizeof(serv_addr)) >= 0)
 574    {
 575       close(sockfd);
 576       return Net_Connected; // we can connect, so we have a network!
 577    }
 578    else // failed to connect
 579    {
 580 #ifdef ENETUNREACH
 581        if(errno == ENETUNREACH)
 582           return Net_No; // network is unreachable
 583        else
 584 #endif
 585           return Net_Unknown; // connect failed, but don't know why
 586    }
 587 }
 588
 589
 590 int
 591 wxDialUpManagerImpl::CheckProcNet()
 592 {
 593     // assume that the test doesn't work
 594     int netDevice = NetDevice_Unknown;
 595
 596 #ifdef __LINUX__
 597     if (wxFileExists(wxT("/proc/net/route")))
 598     {
 599         // cannot use wxFile::Length because file doesn't support seeking, so
 600         // use stdio directly
 601         FILE *f = fopen("/proc/net/route", "rt");
 602         if (f != NULL)
 603         {
 604             // now we know that we will find all devices we may have
 605             netDevice = NetDevice_None;
 606
 607             char output[256];
 608
 609             while (fgets(output, 256, f) != NULL)
 610             {
 611                 // Test for the known network interface names
 612                 if ( strstr(output, "eth")
 613                         || strstr(output, "wlan")
 614                         || strstr(output, "ath") )
 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 *const ifconfigLocations[] =
 649         {
 650             wxT("/sbin"),         // Linux, FreeBSD, Darwin
 651             wxT("/usr/sbin"),     // SunOS, Solaris, AIX, HP-UX
 652             wxT("/usr/etc"),      // IRIX
 653             wxT("/etc"),          // AIX 5
 654         };
 655
 656         for ( size_t n = 0; n < WXSIZEOF(ifconfigLocations); n++ )
 657         {
 658             wxString path(ifconfigLocations[n]);
 659             path << wxT("/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.empty(),
 674                       wxT("can't use ifconfig if it wasn't found") );
 675
 676         wxString tmpfile = wxFileName::CreateTempFileName( wxT("_wxdialuptest") );
 677         wxString cmd = wxT("/bin/sh -c \'");
 678         cmd << m_IfconfigPath;
 679 #if defined(__AIX__) || \
 680     defined(__NETBSD__) || \
 681     defined(__OSF__) || \
 682     defined(__SOLARIS__) || defined (__SUNOS__)
 683         // need to add -a flag
 684         cmd << wxT(" -a");
 685 #elif defined(__LINUX__) || defined(__SGI__) || defined(__OPENBSD__)
 686         // nothing to be added to ifconfig
 687 #elif defined(__FREEBSD__) || defined(__DARWIN__) || defined(__QNX__)
 688         // add -l flag
 689         cmd << wxT(" -l");
 690 #elif defined(__HPUX__)
 691         // VZ: a wild guess (but without it, ifconfig fails completely)
 692         cmd << wxT(" ppp0");
 693 #else
 694         #if defined(__GNUG__)
 695             #warning "No ifconfig information for this OS."
 696         #else
 697             #pragma warning "No ifconfig information for this OS."
 698         #endif
 699
 700         m_CanUseIfconfig = 0;
 701         return -1;
 702 #endif
 703        cmd << wxT(" >") << tmpfile <<  wxT('\'');
 704         /* I tried to add an option to wxExecute() to not close stdout,
 705            so we could let ifconfig write directly to the tmpfile, but
 706            this does not work. That should be faster, as it doesn't call
 707            the shell first. I have no idea why. :-(  (KB) */
 708         if ( wxExecute(cmd,true /* sync */) == 0 )
 709         {
 710             m_CanUseIfconfig = 1;
 711             wxFFile file;
 712             if( file.Open(tmpfile) )
 713             {
 714                 wxString output;
 715                 if ( file.ReadAll(&output) )
 716                 {
 717                     // FIXME shouldn't we grep for "^ppp"? (VZ)
 718
 719                     bool hasModem = false,
 720                          hasLAN = false;
 721
 722 #if defined(__SOLARIS__) || defined (__SUNOS__)
 723                     // dialup device under SunOS/Solaris
 724                     hasModem = strstr(output.fn_str(),"ipdptp") != NULL;
 725                     hasLAN = strstr(output.fn_str(), "hme") != NULL;
 726 #elif defined(__LINUX__) || defined (__FREEBSD__) || defined (__QNX__) || \
 727       defined(__OPENBSD__)
 728                     hasModem = strstr(output.fn_str(),"ppp")    // ppp
 729                         || strstr(output.fn_str(),"sl")  // slip
 730                         || strstr(output.fn_str(),"pl"); // plip
 731                     hasLAN = strstr(output.fn_str(), "eth") != NULL;
 732 #elif defined(__SGI__)  // IRIX
 733                     hasModem = strstr(output.fn_str(), "ppp") != NULL; // PPP
 734 #elif defined(__HPUX__)
 735                     // if could run ifconfig on interface, then it exists
 736                     hasModem = true;
 737 #endif
 738
 739                     netDevice = NetDevice_None;
 740                     if ( hasModem )
 741                         netDevice |= NetDevice_Modem;
 742                     if ( hasLAN )
 743                         netDevice |= NetDevice_LAN;
 744                 }
 745                 //else: error reading the file
 746             }
 747             //else: error opening the file
 748         }
 749         else // could not run ifconfig correctly
 750         {
 751             m_CanUseIfconfig = 0; // don't try again
 752         }
 753
 754         (void) wxRemoveFile(tmpfile);
 755     }
 756
 757     return netDevice;
 758 #endif
 759 }
 760
 761 wxDialUpManagerImpl::NetConnection wxDialUpManagerImpl::CheckPing()
 762 {
 763     // First time check for ping location. We only use the variant
 764     // which does not take arguments, a la GNU.
 765     if(m_CanUsePing == -1) // unknown
 766     {
 767 #ifdef __VMS
 768         if (wxFileExists( wxT("SYS$SYSTEM:TCPIP$PING.EXE") ))
 769             m_PingPath = wxT("$SYS$SYSTEM:TCPIP$PING");
 770 #elif defined(__AIX__)
 771         m_PingPath = wxT("/etc/ping");
 772 #elif defined(__SGI__)
 773         m_PingPath = wxT("/usr/etc/ping");
 774 #else
 775         if (wxFileExists( wxT("/bin/ping") ))
 776             m_PingPath = wxT("/bin/ping");
 777         else if (wxFileExists( wxT("/usr/sbin/ping") ))
 778             m_PingPath = wxT("/usr/sbin/ping");
 779 #endif
 780         if (!m_PingPath)
 781         {
 782             m_CanUsePing = 0;
 783         }
 784     }
 785
 786     if(! m_CanUsePing)
 787     {
 788        // we didn't find ping
 789        return Net_Unknown;
 790     }
 791
 792     wxLogNull ln; // suppress all error messages
 793     wxASSERT(m_PingPath.length());
 794     wxString cmd;
 795     cmd << m_PingPath << wxT(' ');
 796 #if defined(__SOLARIS__) || defined (__SUNOS__)
 797     // nothing to add to ping command
 798 #elif defined(__AIX__) || \
 799       defined (__BSD__) || \
 800       defined(__LINUX__) || \
 801       defined(__OSF__) || \
 802       defined(__SGI__) || \
 803       defined(__VMS) || \
 804       defined(__QNX__)
 805     cmd << wxT("-c 1 "); // only ping once
 806 #elif defined(__HPUX__)
 807     cmd << wxT("64 1 "); // only ping once (need also specify the packet size)
 808 #else
 809     #if defined(__GNUG__)
 810         #warning "No Ping information for this OS."
 811     #else
 812         #pragma warning "No Ping information for this OS."
 813     #endif
 814
 815     m_CanUsePing = 0;
 816     return Net_Unknown;
 817 #endif
 818     cmd << m_BeaconHost;
 819     if(wxExecute(cmd, true /* sync */) == 0)
 820         return Net_Connected;
 821     else
 822         return Net_No;
 823 }
 824
 825 /* static */
 826 wxDialUpManager *wxDialUpManager::Create()
 827 {
 828    return new wxDialUpManagerImpl;
 829 }
 830
 831 #endif // wxUSE_DIALUP_MANAGER