base-files: ipcalc.sh: Rewrite in pure shell

Also add better error checking on input.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
This commit is contained in:
Philip Prindeville 2023-10-22 13:27:50 -06:00
parent 1438bc583c
commit 854739b32c
2 changed files with 232 additions and 83 deletions

View file

@ -1,100 +1,109 @@
#!/usr/bin/awk -f #!/bin/sh
function bitcount(c) { . /lib/functions/ipv4.sh
c=and(rshift(c, 1),0x55555555)+and(c,0x55555555)
c=and(rshift(c, 2),0x33333333)+and(c,0x33333333) PROG="$(basename "$0")"
c=and(rshift(c, 4),0x0f0f0f0f)+and(c,0x0f0f0f0f)
c=and(rshift(c, 8),0x00ff00ff)+and(c,0x00ff00ff) usage() {
c=and(rshift(c,16),0x0000ffff)+and(c,0x0000ffff) echo "Usage: $PROG address/prefix [ start limit ]" >&2
return c exit 1
} }
function ip2int(ip) { if [ $# -eq 0 ]; then
ret=0 usage
n=split(ip,a,"\\.") fi
for (x=1;x<=n;x++)
ret=or(lshift(ret,8),a[x])
return ret
}
function int2ip(ip,ret,x) { case "$1" in
ret=and(ip,255) */*.*)
ip=rshift(ip,8) str2ip ipaddr "${1%/*}" || exit 1
for(;x<3;x++) { str2ip netmask "${1#*/}" || exit 1
ret=and(ip,255)"."ret shift
ip=rshift(ip,8) ;;
} */*)
return ret str2ip ipaddr "${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
;;
*)
str2ip ipaddr "$1" || exit 1
str2ip netmask "$2" || exit 1
shift 2
;;
esac
function compl32(v) { if [ $# -ne 0 ] && [ $# -ne 2 ]; then
ret=xor(v, 0xffffffff) usage
return ret fi
}
BEGIN { if ! bitcount prefix "$netmask"; then
slpos=index(ARGV[1],"/") printf "Invalid netmask (%s)\n" "$netmask" >&2
if (slpos != 0) { exit 1
# rearrange arguments to not use compound notation fi
ARGV[4]=ARGV[3]
ARGV[3]=ARGV[2] # complement of the netmask, i.e. the hostmask
ARGV[2]=substr(ARGV[1],slpos+1) hostmask=$((netmask ^ 0xffffffff))
ARGV[1]=substr(ARGV[1],0,slpos-1) network=$((ipaddr & netmask))
} broadcast=$((network | hostmask))
ipaddr=ip2int(ARGV[1])
dotpos=index(ARGV[2],".") ip2str IP "$ipaddr"
if (dotpos == 0) ip2str NETMASK "$netmask"
netmask=compl32(2**(32-int(ARGV[2]))-1) ip2str NETWORK "$network"
echo "IP=$IP"
echo "NETMASK=$NETMASK"
if [ "$prefix" -le 30 ]; then
ip2str BROADCAST "$broadcast"
echo "BROADCAST=$BROADCAST"
fi
echo "NETWORK=$NETWORK"
echo "PREFIX=$prefix"
[ $# -eq 0 ] && exit 0
if [ "$prefix" -le 30 ]; then
lower=$((network + 1))
else else
netmask=ip2int(ARGV[2]) lower="$network"
fi
network=and(ipaddr,netmask) start="$1"
prefix=32-bitcount(compl32(netmask)) assert_uint32 "$start" || exit 1
start=$((network | (start & hostmask)))
[ "$start" -lt "$lower" ] && start="$lower"
[ "$start" -eq "$ipaddr" ] && start=$((start + 1))
print "IP="int2ip(ipaddr) if [ "$prefix" -le 30 ]; then
print "NETMASK="int2ip(netmask) upper=$(((network | hostmask) - 1))
print "NETWORK="int2ip(network)
if (prefix<=30) {
broadcast=or(network,compl32(netmask))
print "BROADCAST="int2ip(broadcast)
}
print "PREFIX="prefix
# range calculations:
# ipcalc <ip> <netmask> <range_start> <range_size>
if (ARGC <= 3)
exit(0)
if (prefix<=30)
limit=network+1
else else
limit=network upper="$network"
fi
start=or(network,and(ip2int(ARGV[3]),compl32(netmask))) range="$2"
if (start<limit) start=limit assert_uint32 "$range" || exit 1
if (start==ipaddr) start=ipaddr+1 end=$((start + range - 1))
[ "$end" -gt "$upper" ] && end="$upper"
[ "$end" -eq "$ipaddr" ] && end=$((end - 1))
if (prefix<=30) if [ "$start" -gt "$end" ]; then
limit=or(network,compl32(netmask))-1 echo "network ($NETWORK/$prefix) too small" >&2
else exit 1
limit=or(network,compl32(netmask)) fi
end=start+ARGV[4]-1 ip2str START "$start"
if (end>limit) end=limit ip2str END "$end"
if (end==ipaddr) end=ipaddr-1
if (start>end) { if [ "$start" -le "$ipaddr" ] && [ "$ipaddr" -le "$end" ]; then
print "network ("int2ip(network)"/"prefix") too small" > "/dev/stderr" echo "error: address $IP inside range $START..$END" >&2
exit(1) exit 1
} fi
if (ipaddr >= start && ipaddr <= end) { echo "START=$START"
print "warning: ipaddr inside range - this might not be supported in future releases of Openwrt" > "/dev/stderr" echo "END=$END"
# turn this into an error after Openwrt 24 has been released
# exit(1)
}
print "START="int2ip(start) exit 0
print "END="int2ip(end)
}

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@ -0,0 +1,140 @@
uint_max=4294967295
assert_uint32() {
local __n="$1"
if [ -z "$__n" -o -n "${__n//[0-9]/}" ]; then
printf "Not a decimal integer (%s)\n" "$__n ">&2
return 1
fi
if [ "$__n" -gt $uint_max ]; then
printf "Out of range (%s)\n" "$__n" >&2
return 1
fi
if [ "$((__n + 0))" != "$__n" ]; then
printf "Not normalized notation (%s)\n" "$__n" >&2
return 1
fi
return 0
}
bitcount() {
local __var="$1" __c="$2"
assert_uint32 "$__c" || return 1
__c=$((((__c >> 1) & 0x55555555) + (__c & 0x55555555)))
__c=$((((__c >> 2) & 0x33333333) + (__c & 0x33333333)))
__c=$((((__c >> 4) & 0x0f0f0f0f) + (__c & 0x0f0f0f0f)))
__c=$((((__c >> 8) & 0x00ff00ff) + (__c & 0x00ff00ff)))
__c=$((((__c >> 16) & 0x0000ffff) + (__c & 0x0000ffff)))
export -- "$__var=$__c"
}
# tedious but portable with busybox's limited shell
str2ip() {
local __var="$1" __ip="$2" __n __val=0
case "$__ip" in
[0-9].*)
__n="${__ip:0:1}"
__ip="${__ip:2}"
;;
[1-9][0-9].*)
__n="${__ip:0:2}"
__ip="${__ip:3}"
;;
1[0-9][0-9].*|2[0-4][0-9].*|25[0-5].*)
__n="${__ip:0:3}"
__ip="${__ip:4}"
;;
*)
printf "Not a dotted quad (%s)\n" "$2" >&2
return 1
;;
esac
__val=$((__n << 24))
case "$__ip" in
[0-9].*)
__n="${__ip:0:1}"
__ip="${__ip:2}"
;;
[1-9][0-9].*)
__n="${__ip:0:2}"
__ip="${__ip:3}"
;;
1[0-9][0-9].*|2[0-4][0-9].*|25[0-5].*)
__n="${__ip:0:3}"
__ip="${__ip:4}"
;;
*)
printf "Not a dotted quad (%s)\n" "$2" >&2
return 1
;;
esac
__val=$((__val + (__n << 16)))
case "$__ip" in
[0-9].*)
__n="${__ip:0:1}"
__ip="${__ip:2}"
;;
[1-9][0-9].*)
__n="${__ip:0:2}"
__ip="${__ip:3}"
;;
1[0-9][0-9].*|2[0-4][0-9].*|25[0-5].*)
__n="${__ip:0:3}"
__ip="${__ip:4}"
;;
*)
printf "Not a dotted quad (%s)\n" "$2" >&2
return 1
;;
esac
__val=$((__val + (__n << 8)))
case "$__ip" in
[0-9])
__n="${__ip:0:1}"
__ip="${__ip:1}"
;;
[1-9][0-9])
__n="${__ip:0:2}"
__ip="${__ip:2}"
;;
1[0-9][0-9]|2[0-4][0-9]|25[0-5])
__n="${__ip:0:3}"
__ip="${__ip:3}"
;;
*)
printf "Not a dotted quad (%s)\n" "$2" >&2
return 1
;;
esac
__val=$((__val + __n))
if [ -n "$__ip" ]; then
printf "Not a dotted quad (%s)\n" "$2" >&2
return 1
fi
export -- "$__var=$__val"
return 0
}
ip2str() {
local __var="$1" __n="$2"
assert_uint32 "$__n" || return 1
export -- "$__var=$((__n >> 24)).$(((__n >> 16) & 255)).$(((__n >> 8) & 255)).$((__n & 255))"
}