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luci-base: luci.sys.iptparser: properly check for table support

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Do not assume that the "raw" table is present on any system, instead check
/proc/net/ip{,6}_tables_names to determine which iptables tables are available.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
This commit is contained in:
Jo-Philipp Wich 2016-12-21 18:04:04 +01:00
parent 70c277e60d
commit b56d1a85e2
1 changed files with 25 additions and 11 deletions
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36
modules/luci-base/luasrc/sys/iptparser.lua
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@ -31,29 +31,43 @@ function IptParser.__init__( self, family )
self._family = (tonumber(family) == 6) and 6 or 4
self._rules = { }
self._chains = { }
self._tables = { }
local t = self._tables
local s = self:_supported_tables(self._family)
if s.filter then t[#t+1] = "filter" end
if s.nat then t[#t+1] = "nat" end
if s.mangle then t[#t+1] = "mangle" end
if s.raw then t[#t+1] = "raw" end
if self._family == 4 then
self._nulladdr = "0.0.0.0/0"
self._tables = { "filter", "nat", "mangle", "raw" }
self._command = "iptables -t %s --line-numbers -nxvL"
else
self._nulladdr = "::/0"
self._tables = { "filter", "mangle", "raw" }
local ok, lines = pcall(io.lines, "/proc/net/ip6_tables_names")
if ok and lines then
local line
for line in lines do
if line == "nat" then
self._tables = { "filter", "nat", "mangle", "raw" }
end
end
end
self._command = "ip6tables -t %s --line-numbers -nxvL"
end
self:_parse_rules()
end
function IptParser._supported_tables( self, family )
local tables = { }
local ok, lines = pcall(io.lines,
(family == 6) and "/proc/net/ip6_tables_names"
or "/proc/net/ip_tables_names")
if ok and lines then
local line
for line in lines do
tables[line] = true
end
end
return tables
end
-- search criteria as only argument. If args is nil or an empty table then all
-- rules will be returned.
--