/*

    File:       SimpleDial.c

    Contains:   Demonstrates the System Configuration framework network connection APIs.

    Written by: DTS

    Copyright:  Copyright (c) 2004 by Apple Computer, Inc., All Rights Reserved.

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

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    Change History (most recent first):

$Log: SimpleDial.c,v $

Revision 1.2  2004/07/13 15:25:45  eskimo1

Work around a problem with the callback get incorrect status values.  Tidy up the termination of the runloop.  Add "\n" to some text strings that needed them.

Revision 1.1  2004/04/28 15:44:28  eskimo1

First checked in.

*/

#include <assert.h>

#include <unistd.h>

#include <CoreFoundation/CoreFoundation.h>

#include <SystemConfiguration/SystemConfiguration.h>

static const char * StatusToString(SCNetworkConnectionStatus status)

    // Returns a string representation of the network connection status.

{

    const char *        result;

    static const char * kStatusStrings[] = { 

        "kSCNetworkConnectionInvalid",

        "kSCNetworkConnectionDisconnected",

        "kSCNetworkConnectionConnecting",

        "kSCNetworkConnectionConnected",

        "kSCNetworkConnectionDisconnecting"

    };

    if (  (status < kSCNetworkConnectionInvalid) 

       || (status > kSCNetworkConnectionDisconnecting) 

       ) {

        result = "unknown";

    } else {

        result = kStatusStrings[status + 1];

    }

    return result;

}

static const char * MinorStatusToString(

    SCNetworkConnectionPPPStatus minorStatus

)

    // Returns a string representation of the minor connection status.

{

    const char *        result;

    static const char * kMinorStatusStrings[] = { 

        "kSCNetworkConnectionPPPDisconnected", 

        "kSCNetworkConnectionPPPInitializing", 

        "kSCNetworkConnectionPPPConnectingLink", 

        "kSCNetworkConnectionPPPDialOnTraffic", 

        "kSCNetworkConnectionPPPNegotiatingLink", 

        "kSCNetworkConnectionPPPAuthenticating", 

        "kSCNetworkConnectionPPPWaitingForCallBack", 

        "kSCNetworkConnectionPPPNegotiatingNetwork", 

        "kSCNetworkConnectionPPPConnected", 

        "kSCNetworkConnectionPPPTerminating", 

        "kSCNetworkConnectionPPPDisconnectingLink", 

        "kSCNetworkConnectionPPPHoldingLinkOff", 

        "kSCNetworkConnectionPPPSuspended", 

        "kSCNetworkConnectionPPPWaitingForRedial"

    };

    if (  (minorStatus < kSCNetworkConnectionPPPDisconnected) 

       || (minorStatus > kSCNetworkConnectionPPPWaitingForRedial) 

       ) {

        result = "unknown";

    } else {

        result = kMinorStatusStrings[minorStatus];

    }

    return result;

}

static SCNetworkConnectionPPPStatus GetMinorStatus(

    SCNetworkConnectionRef connection

)

    // Gets the minor connection status from the extended status 

    // dictionary associated with the connection.  Returns -1 if 

    // it can't get the status, for whatever reason.

{

    SCNetworkConnectionPPPStatus    result;

    CFDictionaryRef                 statusDict;

    CFDictionaryRef                 pppDict;

    CFNumberRef                     minorStatusNum;

    result = -1;

    // Get the extended status dictionary.

    statusDict = SCNetworkConnectionCopyExtendedStatus(connection);

    if (statusDict != NULL) {

        // Extract the PPP sub-dictionary.

        pppDict = CFDictionaryGetValue(statusDict, kSCEntNetPPP);

        if (  (pppDict != NULL) 

           && (CFGetTypeID(pppDict) == CFDictionaryGetTypeID()) 

           ) {

            // Extract the minor status value.

            minorStatusNum = CFDictionaryGetValue(

                pppDict, 

                kSCPropNetPPPStatus

            );

            if (  (minorStatusNum != NULL) 

               && (CFGetTypeID(minorStatusNum) == CFNumberGetTypeID()) 

               ) {

                SInt32 tmp;

                if ( CFNumberGetValue(

                         minorStatusNum, 

                        kCFNumberSInt32Type, &tmp

                     ) 

                   ) {

                    result = tmp;

                }

            }

        }

        CFRelease(statusDict);

    }

    return result;

}

enum {

    kCallbackParamsMagic = 0x66642666

};

struct CallbackParams {

    int                             magic;      // kCallbackParamsMagic

    Boolean                         forcePrintStatus;

    SCNetworkConnectionStatus       lastMajorStatus;

    SCNetworkConnectionPPPStatus    lastMinorStatus;

};

typedef struct CallbackParams CallbackParams;

static void MyNetworkConnectionCallBack(

    SCNetworkConnectionRef          connection,

    SCNetworkConnectionStatus       status,

    void                            *info

)

    // Our network connection callback.  Called out of the runloop 

    // when there's a change in the status of the network connection.

    // It can be called as part of both a connection attempt and a 

    // disconnection attempt.

    //

    // In response to this callback we do two things:

    //

    // 1. Print the current connection status.

    // 2. Once the [dis]connection attempt is resolved (the status 

    //    hits either 'connected' or 'disconnected'), we stop 

    //    the runloop.  This has the effect of breaking the "main" 

    //    function out of its called to CFRunLoopRun, after which 

    //    it can examine the results of the connection.

    //

    // The "info" parameter is a pointer to our per-connection data. 

    // In this case we use this as a pointer to a CallbackParams 

    // structure.  We use this to track the previous state of the 

    // connection so that we don't print redundant status changes.

{

    CallbackParams *                params;

    SCNetworkConnectionPPPStatus    minorStatus;

    time_t                          now;

    struct tm                       nowLocal;

    char                            nowLocalStr[30];

    Boolean                         printMinorStatus;

    assert(connection != NULL);

    assert(info != NULL);

    params = (CallbackParams *) info;

    assert(params->magic = kCallbackParamsMagic);

    // Get a string that represents the current time.

    (void) time(&now);

    (void) localtime_r(&now, &nowLocal);

    (void) strftime(nowLocalStr, sizeof(nowLocalStr), "%X", &nowLocal);

    // Due to a bug <rdar://problem/3725976>, it's best to get the major status via 

    // SCNetworkConnectionGetStatus than rely on the value being passed into 

    // the callback.

    status = SCNetworkConnectionGetStatus(connection);

    // Get the minor status from the extended status associated with 

    // the connection.

    minorStatus = GetMinorStatus(connection);

    // Print any status changes.

    printMinorStatus = (params->lastMinorStatus != minorStatus);

    if (  (params->forcePrintStatus) 

       || (params->lastMajorStatus != status) 

       ) {

        fprintf(

            stderr, 

            "%s %s (%ld)\n", 

            nowLocalStr, 

            StatusToString(status), 

            (long) status

        );

        printMinorStatus = true;

        params->forcePrintStatus = false;

    }

    if (printMinorStatus) {

        fprintf(

            stderr, 

            "%s     %s (%ld)\n", 

            nowLocalStr, 

            MinorStatusToString(minorStatus), 

            (long) minorStatus

        );

    }

    // If we hit either the connected or disconnected state, 

    // we signal the runloop to stop so that the main function 

    // can process the result of the [dis]connection attempt.

    if (  (  minorStatus == kSCNetworkConnectionPPPDisconnected ) 

       || (  minorStatus == kSCNetworkConnectionPPPConnected    ) 

       ) {

        CFRunLoopStop(CFRunLoopGetCurrent());

    }

    // Record the new status.

    params->lastMajorStatus = status;

    params->lastMinorStatus = minorStatus;

}

int main (int argc, const char * argv[])

    // This program finds the first PPP connection service in the 

    // current network configuration and then connects and 

    // disconnects that service.

{

    int                     err;

    Boolean                 ok;

    CFStringRef             serviceToDial;

    CFDictionaryRef         optionsForDial;

    SCNetworkConnectionRef  connection;

    CallbackParams          params;

    serviceToDial  = NULL;

    optionsForDial = NULL;

    connection     = NULL;

    // If we're run without an argument, just print the usage.

    err = 0;

    if (argc != 1) {

        const char *programName;

        programName = strrchr(argv[0], '/');

        if (programName == NULL) {

            programName = argv[0];

        } else {

            programName += 1;

        }

        fprintf(stderr, "Usage: %s\n", programName);

        err = ECANCELED;

    }

    // Find the serviceID of the PPP service to dial and the user's 

    // preferred dialling options.  This routine picks up the last 

    // service dialled using Internet Connect (and the associated 

    // options) or, if Internet Connect has not been used, returns 

    // the first PPP service listed in the Network preferences pane.

    if (err == 0) {

        ok = SCNetworkConnectionCopyUserPreferences(

            NULL, 

            &serviceToDial,

            &optionsForDial

        );

        if ( ! ok ) {

            err = SCError();

        }

    }

    // Create a SCNetworkConnectionRef for it.

    if (err == 0) {

        SCNetworkConnectionContext context;

        // Set up the parameters to our callback function.

        params.magic            = kCallbackParamsMagic;

        params.forcePrintStatus = true;

        params.lastMinorStatus  = kSCNetworkConnectionDisconnected;

        params.lastMinorStatus  = kSCNetworkConnectionPPPDisconnected;

        // Set up the context to reference those parameters.

        context.version         = 0;

        context.info            = (void *) &params;

        context.retain          = NULL;

        context.release         = NULL;

        context.copyDescription = NULL;

        connection = SCNetworkConnectionCreateWithServiceID(

            NULL,

            serviceToDial, 

            MyNetworkConnectionCallBack,

            &context

        );

        if (connection == NULL) {

            err = SCError();

        }

    }

    // Schedule our callback with the runloop.

    if (err == 0) {

        ok = SCNetworkConnectionScheduleWithRunLoop(

            connection,

            CFRunLoopGetCurrent(),

            kCFRunLoopDefaultMode

        );

        if ( ! ok ) {

            err = SCError();

        }

    }

    // Check the status.  If we're already connected tell the user. 

    // If we're not connected, initiate the connection.

    if (err == 0) {

        err = ECANCELED;    // Most cases involve us bailing out, 

                            // so set the error here.

        switch ( SCNetworkConnectionGetStatus(connection) ) {

            case kSCNetworkConnectionDisconnected:

                err = 0;

                break;

            case kSCNetworkConnectionConnecting:

                fprintf(stderr, "Service is already connecting.\n");

                break;

            case kSCNetworkConnectionDisconnecting:

                fprintf(stderr, "Service is disconnecting.\n");

                break;

            case kSCNetworkConnectionConnected:

                fprintf(stderr, "Service is already connected.\n");

                break;

            case kSCNetworkConnectionInvalid:

                fprintf(stderr, "Service is invalid.  Weird.\n");

                break;

            default:

                fprintf(stderr, "Unexpected status.\n");

                break;

        }

    }

    // Initiate the connection.

    if (err == 0) {

        fprintf(stderr, "Connecting...\n");

        ok = SCNetworkConnectionStart(

            connection,

            optionsForDial,

            false

        );

        if ( ! ok ) {

            err = SCError();

        }

    }

    // Run the runloop and wait for our connection attempt to be resolved. 

    // Once that happens, print the result.

    if (err == 0) {

        CFRunLoopRun();

        switch (params.lastMinorStatus) {

            case kSCNetworkConnectionPPPConnected:

                fprintf(stderr, "Connection succeeded\n");

                break;

            case kSCNetworkConnectionPPPDisconnected:

                fprintf(stderr, "Connection failed\n");

                err = ECANCELED;

                break;

            default:

                fprintf(

                    stderr, 

                    "Bad params.lastMinorStatus (%ld)\n", 

                    (long) params.lastMinorStatus

                );

                err = EINVAL;

                break;

        }

    }

    // Wait for a few seconds.

    if (err == 0) {

        fprintf(stderr, "Waiting for a few seconds...\n");

        (void) sleep(5);

    // Initiate a disconnect.

        params.forcePrintStatus = true;

        fprintf(stderr, "Disconnecting...\n");

        ok = SCNetworkConnectionStop(

            connection,

            true

        );

        if ( ! ok ) {

            err = SCError();

        }

    }

    // Run the runloop and wait for our disconnection attempt to be 

    // resolved.  Once that happens, print the result.

    if (err == 0) {

        CFRunLoopRun();

        switch (params.lastMinorStatus) {

            case kSCNetworkConnectionPPPDisconnected:

                fprintf(stderr, "Disconnection succeeded\n");

                break;

            case kSCNetworkConnectionPPPConnected:

                fprintf(stderr, "Disconnection failed\n");

                err = ECANCELED;

                break;

            default:

                fprintf(

                    stderr, 

                    "Bad params.lastMinorStatus (%ld)\n", 

                    (long) params.lastMinorStatus

                );

                err = EINVAL;

                break;

        }

    }

    // Clean up.

    if (serviceToDial != NULL) {

        CFRelease(serviceToDial);

    }

    if (optionsForDial != NULL) {

        CFRelease(optionsForDial);

    }

    if (connection != NULL) {

        (void) SCNetworkConnectionUnscheduleFromRunLoop(

            connection,

            CFRunLoopGetCurrent(),

            kCFRunLoopDefaultMode

        );

        CFRelease(connection);

    }

    if (err == 0) {

        return EXIT_SUCCESS;

    } else {

        if (err != ECANCELED) {

            fprintf(stderr, "Failed with error %d\n.", err);

        }

        return EXIT_FAILURE;

    }

}