mirror of
https://github.com/openwrt/openwrt.git
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e906ccfc8c
See RFC-1918, RFC-3927, and RFC-1122. Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
269 lines
5.4 KiB
Bash
269 lines
5.4 KiB
Bash
uint_max=4294967295
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d_10_0_0_0=167772160
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d_10_255_255_255=184549375
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d_172_16_0_0=2886729728
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d_172_31_255_255=2887778303
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d_192_168_0_0=3232235520
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d_192_168_255_255=3232301055
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d_169_254_0_0=2851995648
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d_169_254_255_255=2852061183
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d_127_0_0_0=2130706432
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d_127_255_255_255=2147483647
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d_224_0_0_0=3758096384
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d_239_255_255_255=4026531839
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# check that $1 is only base 10 digits, and that it doesn't
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# exceed 2^32-1
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assert_uint32() {
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local __n="$1"
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if [ -z "$__n" -o -n "${__n//[0-9]/}" ]; then
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printf "Not a decimal integer (%s)\n" "$__n ">&2
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return 1
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fi
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if [ "$__n" -gt $uint_max ]; then
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printf "Out of range (%s)\n" "$__n" >&2
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return 1
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fi
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if [ "$((__n + 0))" != "$__n" ]; then
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printf "Not normalized notation (%s)\n" "$__n" >&2
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return 1
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fi
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return 0
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}
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# return a count of the number of bits set in $1
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bitcount() {
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local __var="$1" __c="$2"
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assert_uint32 "$__c" || return 1
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__c=$((((__c >> 1) & 0x55555555) + (__c & 0x55555555)))
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__c=$((((__c >> 2) & 0x33333333) + (__c & 0x33333333)))
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__c=$((((__c >> 4) & 0x0f0f0f0f) + (__c & 0x0f0f0f0f)))
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__c=$((((__c >> 8) & 0x00ff00ff) + (__c & 0x00ff00ff)))
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__c=$((((__c >> 16) & 0x0000ffff) + (__c & 0x0000ffff)))
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export -- "$__var=$__c"
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}
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# tedious but portable with busybox's limited shell
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# we check each octet to be in the range of 0..255,
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# and also make sure there's no extaneous characters.
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str2ip() {
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local __var="$1" __ip="$2" __n __val=0
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case "$__ip" in
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[0-9].*)
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__n="${__ip:0:1}"
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__ip="${__ip:2}"
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;;
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[1-9][0-9].*)
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__n="${__ip:0:2}"
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__ip="${__ip:3}"
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;;
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1[0-9][0-9].*|2[0-4][0-9].*|25[0-5].*)
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__n="${__ip:0:3}"
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__ip="${__ip:4}"
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;;
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*)
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printf "Not a dotted quad (%s)\n" "$2" >&2
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return 1
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;;
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esac
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__val=$((__n << 24))
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case "$__ip" in
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[0-9].*)
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__n="${__ip:0:1}"
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__ip="${__ip:2}"
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;;
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[1-9][0-9].*)
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__n="${__ip:0:2}"
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__ip="${__ip:3}"
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;;
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1[0-9][0-9].*|2[0-4][0-9].*|25[0-5].*)
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__n="${__ip:0:3}"
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__ip="${__ip:4}"
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;;
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*)
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printf "Not a dotted quad (%s)\n" "$2" >&2
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return 1
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;;
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esac
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__val=$((__val + (__n << 16)))
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case "$__ip" in
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[0-9].*)
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__n="${__ip:0:1}"
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__ip="${__ip:2}"
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;;
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[1-9][0-9].*)
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__n="${__ip:0:2}"
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__ip="${__ip:3}"
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;;
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1[0-9][0-9].*|2[0-4][0-9].*|25[0-5].*)
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__n="${__ip:0:3}"
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__ip="${__ip:4}"
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;;
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*)
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printf "Not a dotted quad (%s)\n" "$2" >&2
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return 1
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;;
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esac
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__val=$((__val + (__n << 8)))
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case "$__ip" in
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[0-9])
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__n="${__ip:0:1}"
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__ip="${__ip:1}"
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;;
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[1-9][0-9])
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__n="${__ip:0:2}"
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__ip="${__ip:2}"
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;;
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1[0-9][0-9]|2[0-4][0-9]|25[0-5])
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__n="${__ip:0:3}"
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__ip="${__ip:3}"
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;;
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*)
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printf "Not a dotted quad (%s)\n" "$2" >&2
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return 1
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;;
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esac
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__val=$((__val + __n))
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if [ -n "$__ip" ]; then
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printf "Not a dotted quad (%s)\n" "$2" >&2
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return 1
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fi
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export -- "$__var=$__val"
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return 0
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}
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# convert back from an integer to dotted-quad.
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ip2str() {
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local __var="$1" __n="$2"
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assert_uint32 "$__n" || return 1
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export -- "$__var=$((__n >> 24)).$(((__n >> 16) & 255)).$(((__n >> 8) & 255)).$((__n & 255))"
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}
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# convert prefix into an integer bitmask
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prefix2netmask() {
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local __var="$1" __n="$2"
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assert_uint32 "$__n" || return 1
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if [ "$__n" -gt 32 ]; then
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printf "Prefix out-of-range (%s)" "$__n" >&2
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return 1
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fi
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export -- "$__var=$(((~(uint_max >> __n)) & uint_max))"
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}
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_is_contiguous() {
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local __x="$1" # no checking done
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local __y=$((~__x & uint_max))
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local __z=$(((__y + 1) & uint_max))
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[ $((__z & __y)) -eq 0 ]
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}
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# check argument as being contiguous upper bits (and yes,
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# 0 doesn't have any discontiguous bits).
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is_contiguous() {
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local __var="$1" __x="$2" __val=0
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assert_uint32 "$__x" || return 1
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local __y=$((~__x & uint_max))
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local __z=$(((__y + 1) & uint_max))
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[ $((__z & __y)) -eq 0 ] && __val=1
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export -- "$__var=$__val"
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}
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# convert mask to prefix, validating that it's a conventional
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# (contiguous) netmask.
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netmask2prefix() {
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local __var="$1" __n="$2" __cont __bits
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assert_uint32 "$__n" || return 1
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is_contiguous __cont "$__n" || return 1
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if [ $__cont -eq 0 ]; then
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printf "Not a contiguous netmask (%08x)\n" "$__n" >&2
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return 1
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fi
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bitcount __bits "$__n" # already checked
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export -- "$__var=$__bits"
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}
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# check the argument as being an rfc-1918 address
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is_rfc1918() {
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local __var="$1" __x="$2" __val=0
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assert_uint32 "$__x" || return 1
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if [ $d_10_0_0_0 -le $__x ] && [ $__x -le $d_10_255_255_255 ]; then
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__val=1
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elif [ $d_172_16_0_0 -le $__x ] && [ $__x -le $d_172_31_255_255 ]; then
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__val=1
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elif [ $d_192_168_0_0 -le $__x ] && [ $__x -le $d_192_168_255_255 ]; then
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__val=1
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fi
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export -- "$__var=$__val"
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}
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# check the argument as being an rfc-3927 address
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is_rfc3927() {
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local __var="$1" __x="$2" __val=0
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assert_uint32 "$__x" || return 1
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if [ $d_169_254_0_0 -le $__x ] && [ $__x -le $d_169_254_255_255 ]; then
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__val=1
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fi
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export -- "$__var=$__val"
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}
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# check the argument as being an rfc-1122 loopback address
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is_loopback() {
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local __var="$1" __x="$2" __val=0
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assert_uint32 "$__x" || return 1
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if [ $d_127_0_0_0 -le $__x ] && [ $__x -le $d_127_255_255_255 ]; then
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__val=1
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fi
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export -- "$__var=$__val"
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}
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# check the argument as being a multicast address
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is_multicast() {
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local __var="$1" __x="$2" __val=0
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assert_uint32 "$__x" || return 1
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if [ $d_224_0_0_0 -le $__x ] && [ $__x -le $d_239_255_255_255 ]; then
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__val=1
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fi
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export -- "$__var=$__val"
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}
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