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zapret-obfs: optimize

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bol-van
2026-01-27 18:51:29 +03:00
parent f50bd701f7
commit 431e794356
1 changed files with 19 additions and 17 deletions
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36
lua/zapret-obfs.lua
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@@ -95,14 +95,14 @@ end
-- xor ip protocol number and optionally xor tcp,udp,icmp payload with supplied blob pattern
-- arg : ippxor - value to xor ip protocol number
-- arg : dataxor - blob to xor tcp, udp or icmp payload
-- arg : rebuild - reconstruct desync.dis if after ippxor packet becomes tcp,udp or icmp
function ippxor(ctx, desync)
local dataxor
local function need_dxor(dis)
return dataxor and dis.payload and #dis.payload>0 and (dis.tcp or dis.udp or dis.icmp)
end
local function dxor(dis)
if dataxor and dis.payload and #dis.payload>0 and (dis.tcp or dis.udp or dis.icmp) then
dis.payload = bxor(dis.payload, pattern(dataxor,1,#dis.payload))
return true
end
return false
dis.payload = bxor(dis.payload, pattern(dataxor,1,#dis.payload))
end
if not desync.arg.ippxor then
@@ -119,12 +119,10 @@ function ippxor(ctx, desync)
end
end
local bdxor
if dataxor then
bdxor = dxor(desync.dis)
if bdxor then
DLOG("ippxor: dataxor out")
end
local bdxor = need_dxor(desync.dis)
if bdxor then
DLOG("ippxor: dataxor out")
dxor(desync.dis)
end
local l3_from = ip_proto_l3(desync.dis)
@@ -132,18 +130,22 @@ function ippxor(ctx, desync)
fix_ip_proto(desync.dis, l3_to)
DLOG("ippxor: "..l3_from.." => "..l3_to)
if dataxor then
if (not bdxor and dataxor or desync.arg.rebuild) and
(l3_to==IPPROTO_TCP and not desync.dis.tcp or
l3_to==IPPROTO_UDP and not desync.dis.udp or
l3_to==IPPROTO_ICMP and not (desync.dis.ip and desync.dis.icmp) or
l3_to==IPPROTO_ICMPV6 and not (desync.dis.ip6 and desync.dis.icmp))
then
DLOG("ippxor: packet rebuild")
local raw_ip = reconstruct_dissect(desync.dis, {ip6_preserve_next=true})
local dis = dissect(raw_ip)
if not dis.ip and not dis.ip6 then
DLOG_ERR("ippxor: could not rebuild packet")
return
end
if not bdxor then
if dxor(dis) then
DLOG("ippxor: dataxor in")
end
if not bdxor and need_dxor(dis) then
DLOG("ippxor: dataxor in")
dxor(dis)
end
desync.dis = dis
end