Software / code / prosody
Changeset
12932:9bb044705ea1
util.ip: Add ip.truncate() to return a new IP with only the prefix of another
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Tue, 14 Mar 2023 18:24:58 +0000 |
| parents | 12931:bbae3acc6694 |
| children | 12933:3ab0bbb1dc35 |
| files | util/ip.lua |
| diffstat | 1 files changed, 12 insertions(+), 0 deletions(-) [+] |
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--- a/util/ip.lua Tue Mar 14 18:23:33 2023 +0000 +++ b/util/ip.lua Tue Mar 14 18:24:58 2023 +0000 @@ -245,10 +245,22 @@ return getmetatable(obj) == ip_mt; end +local function truncate(ip, n_bits) + if n_bits % 8 ~= 0 then + return error("ip.truncate() only supports multiples of 8 bits"); + end + local n_octets = n_bits / 8; + if not is_ip(ip) then + ip = new_ip(ip); + end + return new_ip(net.ntop(ip.packed:sub(1, n_octets)..("\0"):rep(#ip.packed-n_octets))) +end + return { new_ip = new_ip, commonPrefixLength = commonPrefixLength, parse_cidr = parse_cidr, match = match, is_ip = is_ip; + truncate = truncate; };
