56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
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/*
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Copyright (C) 2016 Srivats P.
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This file is part of "Ostinato"
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This is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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#ifndef _EMULATION_H
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#define _EMULATION_H
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#include "emulproto.pb.h"
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#include <QtGlobal>
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static inline OstProto::DeviceGroup* newDeviceGroup(uint portId)
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{
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OstProto::DeviceGroup *devGrp = new OstProto::DeviceGroup;
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// To ensure that DeviceGroup have a unique key, we assign
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// a random mac address upon creation; ideally, it would
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// have been good to inherit OstProto::DeviceGroup and define
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// a new constructor, but ProtoBuf forbids against inheriting
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// generated classes, so we use this helper function instead
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//
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// Create a mac address as per RFC 4814 Sec 4.2
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// (RR & 0xFC):PP:PP:RR:RR:RR
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// where RR is a random number, PP:PP is 1-indexed port index
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// NOTE: although qrand() return type is a int, the max value
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// is RAND_MAX (stdlib.h) which is often 16-bit only, so we
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// use two random numbers
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quint32 r1 = qrand(), r2 = qrand();
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quint64 mac;
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mac = quint64(r1 & 0xfc00) << 32
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| quint64(portId + 1) << 24
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| quint64((r1 & 0xff) << 16 | (r2 & 0xffff));
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devGrp->MutableExtension(OstEmul::mac)->set_address(mac);
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return devGrp;
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}
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#endif
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