#!/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))
-
- 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)
- exit(0)
-
- start=or(network,and(ip2int(ARGV[3]),compl32(netmask)))
- limit=network+1
- if (start<limit) start=limit
- if (start==ipaddr) start=ipaddr+1
-
- end=start+ARGV[4]
- limit=or(network,compl32(netmask))-1
- if (end>limit) end=limit
- if (end==ipaddr) end=ipaddr-1
-
- if (ipaddr > start && ipaddr < end) {
- print "ipaddr inside range" > "/dev/stderr"
- exit(1)
- }
-
- 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 "${1#*/}" || exit 1
+ shift
+ ;;
+*/*)
+ # more modern prefix notation of n.n.n.n/p
+ str2ip ipaddr "${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
+ netmask=$(((0xffffffff << (32 - prefix)) & 0xffffffff))
+ shift
+ ;;
+*)
+ # address and netmask as two separate arguments
+ str2ip ipaddr "$1" || exit 1
+ str2ip netmask "$2" || exit 1
+ shift 2
+ ;;
+esac
+
+# we either have no arguments left, or we have a range start and length
+if [ $# -ne 0 ] && [ $# -ne 2 ]; then
+ usage
+fi
+
+if ! bitcount prefix "$netmask"; then
+ printf "Invalid netmask (%s)\n" "$netmask" >&2
+ exit 1
+fi
+
+# complement of the netmask, i.e. the hostmask
+hostmask=$((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
projects / openwrt / openwrt.git / blobdiff