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89 lines
2.2 KiB
89 lines
2.2 KiB
##
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# \file
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# To each interface a set of caller functions exist, that take an instance
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# of an object and then in turn call the implementation for the class of
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# this object. If there is none within the class it looks into its
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# parent class and so forth.
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#
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# This is somewhat similar to late binding in real OOP languages, but
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# by far not so elaborated. This is not a real object oriented language
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# and will surely never ever provide all features these have.
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#
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# That said it has proven very usefull for me to orgnize code and prevent
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# code duplication.
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#
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# \author Georg Hopp
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#
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# \copyright
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# Copyright © 2014 Georg Hopp
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#
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# This program 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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#
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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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#
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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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. utils/file.sh
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##
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# Function calculates number of bit in a netmask
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#
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mask2cidr() {
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local NBITS=0
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local OLDIFS="${IFS}"
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IFS=.
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for DEC in $1
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do
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case ${DEC} in
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255) NBITS=$((NBITS+8));;
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254) NBITS=$((NBITS+7));;
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252) NBITS=$((NBITS+6));;
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248) NBITS=$((NBITS+5));;
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240) NBITS=$((NBITS+4));;
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224) NBITS=$((NBITS+3));;
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192) NBITS=$((NBITS+2));;
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128) NBITS=$((NBITS+1));;
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0);;
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*) NBITS=0; IFS="${OLDIFS}"; return 1
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esac
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done
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IFS="${OLDIFS}"
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${ECHO} "${NBITS}"
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}
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##
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# Function calculates a netmask from number of bits
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#
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cidr2mask() {
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local I MASK=""
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local FULL_OCTETS=$((${1}/8))
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local PARTIAL_OCTET=$((${1}%8))
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for I in 0 1 2 3
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do
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if [ ${I} -lt ${FULL_OCTETS} ]
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then
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MASK="${MASK}255"
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elif [ ${I} -eq ${FULL_OCTETS} ]
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then
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MASK="${MASK}$((256-(1<<(8-${PARTIAL_OCTET}))))"
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else
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MASK="${MASK}0"
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fi
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[ ${I} -lt 3 ] && MASK="${MASK}."
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done
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${ECHO} ${MASK}
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}
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# vim: set ts=4 sw=4:
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