122 lines
3.2 KiB
C++
122 lines
3.2 KiB
C++
/*
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Copyright (C) 2010 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 _IP_UTILS_H
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#define _IP_UTILS_H
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namespace ipUtils {
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enum AddrMode {
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kFixed = 0,
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kIncrement = 1,
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kDecrement = 2,
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kRandom = 3
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};
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quint32 inline ipAddress(quint32 baseIp, int prefix, AddrMode mode, int count,
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int index)
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{
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int u;
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quint32 mask = ((1<<prefix) - 1) << (32 - prefix);
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quint32 subnet, host, ip;
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switch(mode)
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{
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case kFixed:
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ip = baseIp;
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break;
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case kIncrement:
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u = index % count;
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subnet = baseIp & mask;
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host = (((baseIp & ~mask) + u) &
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~mask);
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ip = subnet | host;
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break;
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case kDecrement:
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u = index % count;
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subnet = baseIp & mask;
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host = (((baseIp & ~mask) - u) &
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~mask);
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ip = subnet | host;
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break;
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case kRandom:
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subnet = baseIp & mask;
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host = (qrand() & ~mask);
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ip = subnet | host;
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break;
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default:
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qWarning("Unhandled mode = %d", mode);
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}
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return ip;
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}
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void inline ipAddress(quint64 baseIpHi, quint64 baseIpLo, int prefix,
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AddrMode mode, int count, int index, quint64 &ipHi, quint64 &ipLo)
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{
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int u, p, q;
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quint64 maskHi = 0, maskLo = 0;
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quint64 prefixHi, prefixLo;
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quint64 hostHi, hostLo;
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switch(mode)
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{
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case kFixed:
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ipHi = baseIpHi;
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ipLo = baseIpLo;
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break;
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case kIncrement:
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case kDecrement:
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case kRandom:
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u = index % count;
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if (prefix > 64) {
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p = 64;
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q = prefix - 64;
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} else {
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p = prefix;
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q = 0;
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}
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if (p > 0)
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maskHi = ~((quint64(1) << p) - 1);
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if (q > 0)
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maskLo = ~((quint64(1) << q) - 1);
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prefixHi = baseIpHi & maskHi;
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prefixLo = baseIpLo & maskLo;
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if (mode == kIncrement) {
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hostHi = ((baseIpHi & ~maskHi) + 0) & ~maskHi;
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hostLo = ((baseIpLo & ~maskLo) + u) & ~maskLo;
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}
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else if (mode == kDecrement) {
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hostHi = ((baseIpHi & ~maskHi) - 0) & ~maskHi;
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hostLo = ((baseIpLo & ~maskLo) - u) & ~maskLo;
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}
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else if (mode==kRandom) {
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hostHi = qrand() & ~maskHi;
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hostLo = qrand() & ~maskLo;
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}
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ipHi = prefixHi | hostHi;
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ipLo = prefixLo | hostLo;
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break;
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default:
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qWarning("Unhandled mode = %d", mode);
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}
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}
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} // namespace ipUtils
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#endif
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