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zapret-lib: harden apply_fooling checks

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bol-van
2026-02-23 19:33:58 +03:00
parent 937aa91e5d
commit 340261da72
1 changed files with 30 additions and 11 deletions
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41
lua/zapret-lib.lua
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@@ -875,7 +875,11 @@ function apply_fooling(desync, dis, fooling_options)
if type(desync.track.lua_state.autottl_cache)~="table" then desync.track.lua_state.autottl_cache={} end
if type(desync.track.lua_state.autottl_cache[desync.func_instance])~="table" then desync.track.lua_state.autottl_cache[desync.func_instance]={} end
if not desync.track.lua_state.autottl_cache[desync.func_instance].autottl_found then
desync.track.lua_state.autottl_cache[desync.func_instance].autottl = autottl(desync.track.incoming_ttl,parse_autottl(arg_autottl))
attl = parse_autottl(arg_autottl)
if not attl then
error("apply_fooling: invalid autottl value '"..arg_autottl.."'")
end
desync.track.lua_state.autottl_cache[desync.func_instance].autottl = autottl(desync.track.incoming_ttl,attl)
if desync.track.lua_state.autottl_cache[desync.func_instance].autottl then
desync.track.lua_state.autottl_cache[desync.func_instance].autottl_found = true
DLOG("apply_fooling: discovered autottl "..desync.track.lua_state.autottl_cache[desync.func_instance].autottl)
@@ -890,8 +894,11 @@ function apply_fooling(desync, dis, fooling_options)
DLOG("apply_fooling: cannot apply autottl because incoming ttl unknown")
end
end
if not ttl and tonumber(arg_ttl) then
if not ttl and arg_ttl then
ttl = tonumber(arg_ttl)
if not ttl or ttl<0 or ttl>255 then
error("apply_fooling: ip_ttl and ip6_ttl require valid value")
end
end
--io.stderr:write("TTL "..tostring(ttl).."\n")
return ttl
@@ -908,11 +915,19 @@ function apply_fooling(desync, dis, fooling_options)
-- use current packet if dissect not given
if not dis then dis = desync.dis end
if dis.tcp then
if tonumber(fooling_options.tcp_seq) then
dis.tcp.th_seq = u32add(dis.tcp.th_seq, fooling_options.tcp_seq)
if fooling_options.tcp_seq then
if tonumber(fooling_options.tcp_seq) then
dis.tcp.th_seq = u32add(dis.tcp.th_seq, fooling_options.tcp_seq)
else
error("apply_fooling: tcp_seq requires increment parameter. there's no default value.")
end
end
if tonumber(fooling_options.tcp_ack) then
dis.tcp.th_ack = u32add(dis.tcp.th_ack, fooling_options.tcp_ack)
if fooling_options.tcp_ack then
if tonumber(fooling_options.tcp_ack) then
dis.tcp.th_ack = u32add(dis.tcp.th_ack, fooling_options.tcp_ack)
else
error("apply_fooling: tcp_ack requires increment parameter. there's no default value.")
end
end
if fooling_options.tcp_flags_unset then
dis.tcp.th_flags = bitand(dis.tcp.th_flags, bitnot(parse_tcp_flags(fooling_options.tcp_flags_unset)))
@@ -927,12 +942,16 @@ function apply_fooling(desync, dis, fooling_options)
end
end
end
if tonumber(fooling_options.tcp_ts) then
local idx = find_tcp_option(dis.tcp.options,TCP_KIND_TS)
if idx and (dis.tcp.options[idx].data and #dis.tcp.options[idx].data or 0)==8 then
dis.tcp.options[idx].data = bu32(u32add(u32(dis.tcp.options[idx].data),fooling_options.tcp_ts))..string.sub(dis.tcp.options[idx].data,5)
if fooling_options.tcp_ts then
if tonumber(fooling_options.tcp_ts) then
local idx = find_tcp_option(dis.tcp.options,TCP_KIND_TS)
if idx and (dis.tcp.options[idx].data and #dis.tcp.options[idx].data or 0)==8 then
dis.tcp.options[idx].data = bu32(u32add(u32(dis.tcp.options[idx].data),fooling_options.tcp_ts))..string.sub(dis.tcp.options[idx].data,5)
else
DLOG("apply_fooling: timestamp tcp option not present or invalid")
end
else
DLOG("apply_fooling: timestamp tcp option not present or invalid")
error("apply_fooling: tcp_ts requires increment parameter. there's no default value.")
end
end
if fooling_options.tcp_md5 then