diff options
Diffstat (limited to 'package/base-files/files/bin/ipcalc.sh')
| -rwxr-xr-x | package/base-files/files/bin/ipcalc.sh | 195 |
1 files changed, 132 insertions, 63 deletions
diff --git a/package/base-files/files/bin/ipcalc.sh b/package/base-files/files/bin/ipcalc.sh index 5d5eac3ea80..9e2702c60d2 100755 --- a/package/base-files/files/bin/ipcalc.sh +++ b/package/base-files/files/bin/ipcalc.sh @@ -1,71 +1,140 @@ #!/bin/sh -awk -f - $* <<EOF -function bitcount(c) { - c=and(rshift(c, 1),0x55555555)+and(c,0x55555555) - c=and(rshift(c, 2),0x33333333)+and(c,0x33333333) - c=and(rshift(c, 4),0x0f0f0f0f)+and(c,0x0f0f0f0f) - c=and(rshift(c, 8),0x00ff00ff)+and(c,0x00ff00ff) - c=and(rshift(c,16),0x0000ffff)+and(c,0x0000ffff) - return c -} +. /lib/functions/ipv4.sh -function ip2int(ip) { - for (ret=0,n=split(ip,a,"\."),x=1;x<=n;x++) ret=or(lshift(ret,8),a[x]) - return ret -} +PROG="$(basename "$0")" -function int2ip(ip,ret,x) { - ret=and(ip,255) - ip=rshift(ip,8) - for(;x<3;ret=and(ip,255)"."ret,ip=rshift(ip,8),x++); - return ret -} +# wrapper to convert an integer to an address, unless we're using +# decimal output format. +# hook for library function +_ip2str() { + local var="$1" n="$2" + assert_uint32 "$n" || exit 1 -function compl32(v) { - ret=xor(v, 0xffffffff) - return ret + if [ "$decimal" -ne 0 ]; then + export -- "$var=$n" + elif [ "$hexadecimal" -ne 0 ]; then + export -- "$var=$(printf "%x" "$n")" + else + ip2str "$@" + fi } -BEGIN { - slpos=index(ARGV[1],"/") - if (slpos == 0) { - ipaddr=ip2int(ARGV[1]) - dotpos=index(ARGV[2],".") - if (dotpos == 0) - netmask=compl32(2**(32-int(ARGV[2]))-1) - else - netmask=ip2int(ARGV[2]) - } else { - ipaddr=ip2int(substr(ARGV[1],0,slpos-1)) - netmask=compl32(2**(32-int(substr(ARGV[1],slpos+1)))-1) - ARGV[4]=ARGV[3] - ARGV[3]=ARGV[2] - } - - network=and(ipaddr,netmask) - broadcast=or(network,compl32(netmask)) - - start=or(network,and(ip2int(ARGV[3]),compl32(netmask))) - limit=network+1 - if (start<limit) start=limit - - end=start+ARGV[4] - limit=or(network,compl32(netmask))-1 - if (end>limit) end=limit - - print "IP="int2ip(ipaddr) - print "NETMASK="int2ip(netmask) - print "BROADCAST="int2ip(broadcast) - print "NETWORK="int2ip(network) - print "PREFIX="32-bitcount(compl32(netmask)) - - # range calculations: - # ipcalc <ip> <netmask> <start> <num> - - if (ARGC > 3) { - print "START="int2ip(start) - print "END="int2ip(end) - } +usage() { + echo "Usage: $PROG [ -d | -x ] address/prefix [ start limit ]" >&2 + exit 1 } -EOF + +decimal=0 +hexadecimal=0 +if [ "$1" = "-d" ]; then + decimal=1 + shift +elif [ "$1" = "-x" ]; then + hexadecimal=1 + shift +fi + +if [ $# -eq 0 ]; then + usage +fi + +case "$1" in +*/*.*) + # data is n.n.n.n/m.m.m.m format, like on a Cisco router + str2ip ipaddr "${1%/*}" || exit 1 + str2ip netmask "${1#*/}" || exit 1 + netmask2prefix prefix "$netmask" || exit 1 + shift + ;; +*/*) + # more modern prefix notation of n.n.n.n/p + str2ip ipaddr "${1%/*}" || exit 1 + prefix="${1#*/}" + assert_uint32 "$prefix" || exit 1 + if [ "$prefix" -gt 32 ]; then + printf "Prefix out of range (%s)\n" "$prefix" >&2 + exit 1 + fi + prefix2netmask netmask "$prefix" || exit 1 + shift + ;; +*) + # address and netmask as two separate arguments + str2ip ipaddr "$1" || exit 1 + str2ip netmask "$2" || exit 1 + netmask2prefix prefix "$netmask" || exit 1 + shift 2 + ;; +esac + +# we either have no arguments left, or we have a range start and length +if [ $# -ne 0 ] && [ $# -ne 2 ]; then + usage +fi + +# complement of the netmask, i.e. the hostmask +hostmask=$((netmask ^ 0xffffffff)) +network=$((ipaddr & netmask)) +broadcast=$((network | hostmask)) +count=$((hostmask + 1)) + +_ip2str IP "$ipaddr" +_ip2str NETMASK "$netmask" +_ip2str NETWORK "$network" + +echo "IP=$IP" +echo "NETMASK=$NETMASK" +# don't include this-network or broadcast addresses +if [ "$prefix" -le 30 ]; then + _ip2str BROADCAST "$broadcast" + echo "BROADCAST=$BROADCAST" +fi +echo "NETWORK=$NETWORK" +echo "PREFIX=$prefix" +echo "COUNT=$count" + +# if there's no range, we're done +[ $# -eq 0 ] && exit 0 + +if [ "$prefix" -le 30 ]; then + lower=$((network + 1)) +else + lower="$network" +fi + +start="$1" +assert_uint32 "$start" || exit 1 +start=$((network | (start & hostmask))) +[ "$start" -lt "$lower" ] && start="$lower" +[ "$start" -eq "$ipaddr" ] && start=$((start + 1)) + +if [ "$prefix" -le 30 ]; then + upper=$(((network | hostmask) - 1)) +else + upper="$network" +fi + +range="$2" +assert_uint32 "$range" || exit 1 +end=$((start + range - 1)) +[ "$end" -gt "$upper" ] && end="$upper" +[ "$end" -eq "$ipaddr" ] && end=$((end - 1)) + +if [ "$start" -gt "$end" ]; then + echo "network ($NETWORK/$prefix) too small" >&2 + exit 1 +fi + +_ip2str START "$start" +_ip2str END "$end" + +if [ "$start" -le "$ipaddr" ] && [ "$ipaddr" -le "$end" ]; then + echo "error: address $IP inside range $START..$END" >&2 + exit 1 +fi + +echo "START=$START" +echo "END=$END" + +exit 0 |