160 lines
4.8 KiB
Plaintext
160 lines
4.8 KiB
Plaintext
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#! /bin/sh
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#
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# network-functions: Network functions script for openmamba
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#
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# Copyright (c) 2003-2005 by Silvan Calarco <silvan.calarco@mambasoft.it>
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# Copyright (c) 2003-2005,2011 by Davide Madrisan <davide.madrisan@gmail.com>
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. /etc/sysconfig/rc
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# ip_check_args()
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#
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# parameters:
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# $1 : ip/bitmask (like 192.168.0.1/24) -or-
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# $1 $2 : ip netmask (like 192.168.0.1 255.255.255.0)
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# description:
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# This function checks if its first / first two arguments are
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# a valid ipv4 address.
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# If it is a valid one, returns '1' and set the variables
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# $ip (ip address)
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# $mask_bit (number of active bits in the maks)
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# $mask (mask)
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# otherwise returns '0'
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ip_check_args ()
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{
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local i
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# checks if the first argument is a valid one, that is something
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# like "192.168.0.1" or "192.168.0.1/24"
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if ! echo $1 | grep -Eq "^([0-9]+\.){3}[0-9]+(/[0-9]+){0,1}$"; then
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return 0
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fi
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ip=`echo $1 | cut -f1 -d/`
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for i in `seq 1 4`; do # check for range in [0..255]
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local byte=`echo $ip | cut -f$i -d.`
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[ $byte -le 255 ] || return 0
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done
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# gets the mask from $1, if $1 is like '192.168.0.1/24',
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# otherwise 'mask_bit' is set to ""
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mask_bits=`echo $1 | cut -f2 -s -d/`
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if [ $mask_bits ]; then # 'mask_bit' is not ""
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[ $mask_bits -le 32 ] || return 0 # illegal 'mask_bit'
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# set 'mask'. i.e. mask_bits = 24 --> mask = 255.255.255.0
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local mb=$mask_bits
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for i in `seq 1 4`; do
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if [ $mb -ge 8 ]; then
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mask=$mask"255"
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mb=$(($mb - 8))
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else
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mask=$mask$(( 256 - (2 << (7-$mb)) ))
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[ $mb -gt 0 ] && mb=0
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fi
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[ $i -lt 4 ] && mask=$mask"."
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done
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else # $2 should be a network mask (like 255.255.255.0)
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if ! echo $2 | grep -Eq "^([0-9]+\.){3}[0-9]+$"; then
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return 0
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fi
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mask=$2
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local prev_byte=255
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local prev_bit=1
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mask_bits=0
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for i in `seq 1 4`; do
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local byte=`echo $mask | cut -f$i -d.`
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[ $byte -gt 255 ] && return 0
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# if the previous was < 255, the current one must be 0
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[ $prev_byte -lt 255 -a $byte -ne 0 ] && return 0
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# internal loop to set 'mask_bits'
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for j in `seq 7 0`; do
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local bit_value=$(( ($byte >> j) & 1 ))
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# if the previous bit was '0', the current can't be '1'
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[ $prev_bit -eq 0 -a $bit_value -eq 1 ] && return 0
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[ $bit_value -eq 1 ] && mask_bits=$(( $mask_bits + 1 ))
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prev_bit=$bit_value
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done
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prev_byte=$byte
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done
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fi
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return 1
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}
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# calculate_ip_parameters()
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#
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# parameters:
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# $1 : ip
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# $2 : netmask
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# description:
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# This function set the variables
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# $network (network address)
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# $broadcast (broadcast address)
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# $wildcard (wildcard mask)
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# calculated using as input the ip/network address $1/$2.
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# If $1/$2 is a valid ipv4 address, returns '0', otherwise
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# returns '1'
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calculate_ip_parameters ()
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{
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local i
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unset network broadcast wildcard
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ip_check_args $1 $2
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[ $? -eq 0 ] && return 1
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for i in 1 2 3 4; do
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ip_byte=`echo $ip | cut -f$i -d.`
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mask_byte=`echo $mask | cut -f$i -d.`
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ip_and_mask=$(( $ip_byte & $mask_byte ))
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mask_cplm=$(( 255 - $mask_byte ))
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wildcard=$wildcard$mask_cplm
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network=$network$ip_and_mask
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broadcast=$broadcast$((ip_and_mask + mask_cplm))
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if [ $i -lt 4 ]; then
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network=$network"."
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broadcast=$broadcast"."
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wildcard=$wildcard"."
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fi
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done
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return 0
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}
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# get_interface_parameters()
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#
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# parameters:
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# $1 : interface name (i.e. eth0)
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# description:
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# If no error occurs, this function return '0' and set the variables
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# $int_ip
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# $int_netmask
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# $int_network
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# $int_broadcast
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# $int_static_ip (0: static IP; 1: dynamic IP (DHCP))
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# to the system values found for interface $1, otherwise returns '1'
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get_interface_parameters ()
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{
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local int_name="$1"
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[ x"$int_name" != x ] || return 1
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int_ip=`/sbin/ifconfig $int_name 2>/dev/null | \
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sed -n '/inet addr/{s,.*inet addr:\([^ \t]*\).*,\1,;p}'`
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int_broadcast=`/sbin/ifconfig $int_name 2>/dev/null | \
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sed -n '/inet addr:.*Bcast:/{s,.*Bcast:\([^ \t]*\).*,\1,;p}'`
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int_netmask=`/sbin/ifconfig $int_name 2>/dev/null | \
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sed -n '/inet addr:.*Mask:/{s,.*Mask:\([^ \t]*\).*,\1,;p}'`
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# note: loopback interface has null 'int_broadcast' value
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[ -z "$int_ip" -o -z "$int_netmask" ] && return 1
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int_static_ip=1
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# this check was written to avoid backward compatibility issues
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if [ -r $network_devices/ifconfig.$int_name ]; then
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if grep -Eq "^BOOTPROTO=dhcp" $network_devices/ifconfig.$int_name; then
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int_static_ip=0
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fi
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fi
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calculate_ip_parameters "$int_ip" "$int_netmask"
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int_network=$network
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return 0
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}
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