+++ /dev/null
---[[
-FFLuCI - Iptables parser and query library
-
-Copyright 2008 Jo-Philipp Wich <freifunk@wwsnet.net>
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-
-$Id$
-
-]]--
-
-module("ffluci.iptparser", package.seeall)
-require("ffluci.sys")
-require("ffluci.util")
-
-
-IptParser = ffluci.util.class()
-
---[[
-IptParser.__init__( ... )
-
-The class constructor, initializes the internal lookup table.
-]]--
-
-function IptParser.__init__( self, ... )
- self._rules = { }
- self._chain = nil
- self:_parse_rules()
-end
-
-
---[[
-IptParser.find( args )
-
-Find all firewall rules that match the given criteria. Expects a table with search criteria as only argument.
-If args is nil or an empty table then all rules will be returned.
-
-The following keys in the args table are recognized:
-
- - table Match rules that are located within the given table
- - chain Match rules that are located within the given chain
- - target Match rules with the given target
- - protocol Match rules that match the given protocol, rules with protocol "all" are always matched
- - source Match rules with the given source, rules with source "0.0.0.0/0" are always matched
- - destination Match rules with the given destination, rules with destination "0.0.0.0/0" are always matched
- - inputif Match rules with the given input interface, rules with input interface "*" (=all) are always matched
- - outputif Match rules with the given output interface, rules with output interface "*" (=all) are always matched
- - flags Match rules that match the given flags, current supported values are "-f" (--fragment) and "!f" (! --fragment)
- - options Match rules containing all given options
-
-The return value is a list of tables representing the matched rules.
-Each rule table contains the following fields:
-
- - index The index number of the rule
- - table The table where the rule is located, can be one of "filter", "nat" or "mangle"
- - chain The chain where the rule is located, e.g. "INPUT" or "postrouting_wan"
- - target The rule target, e.g. "REJECT" or "DROP"
- - protocol The matching protocols, e.g. "all" or "tcp"
- - flags Special rule options ("--", "-f" or "!f")
- - inputif Input interface of the rule, e.g. "eth0.0" or "*" for all interfaces
- - outputif Output interface of the rule, e.g. "eth0.0" or "*" for all interfaces
- - source The source ip range, e.g. "0.0.0.0/0"
- - destination The destination ip range, e.g. "0.0.0.0/0"
- - options A list of specific options of the rule, e.g. { "reject-with", "tcp-reset" }
- - packets The number of packets matched by the rule
- - bytes The number of total bytes matched by the rule
-
-Example:
-
-ip = IptParser();
-result = ip.find( {
- target="REJECT",
- protocol="tcp",
- options={ "reject-with", "tcp-reset" }
-} )
-
-This will match all rules with target "-j REJECT", protocol "-p tcp" (or "-p all") and the option "--reject-with tcp-reset".
-
-]]--
-
-function IptParser.find( self, args )
-
- local args = args or { }
- local rv = { }
-
- for i, rule in ipairs(self._rules) do
- local match = true
-
- -- match table
- if not ( not args.table or args.table == rule.table ) then
- match = false
- end
-
- -- match chain
- if not ( match == true and ( not args.chain or args.chain == rule.chain ) ) then
- match = false
- end
-
- -- match target
- if not ( match == true and ( not args.target or args.target == rule.target ) ) then
- match = false
- end
-
- -- match protocol
- if not ( match == true and ( not args.protocol or rule.protocol == "all" or args.protocol == rule.protocol ) ) then
- match = false
- end
-
- -- match source (XXX: implement ipcalc stuff so that 192.168.1.0/24 matches 0.0.0.0/0 etc.)
- if not ( match == true and ( not args.source or rule.source == "0.0.0.0/0" or rule.source == args.source ) ) then
- match = false
- end
-
- -- match destination (XXX: implement ipcalc stuff so that 192.168.1.0/24 matches 0.0.0.0/0 etc.)
- if not ( match == true and ( not args.destination or rule.destination == "0.0.0.0/0" or rule.destination == args.destination ) ) then
- match = false
- end
-
- -- match input interface
- if not ( match == true and ( not args.inputif or rule.inputif == "*" or args.inputif == rule.inputif ) ) then
- match = false
- end
-
- -- match output interface
- if not ( match == true and ( not args.outputif or rule.outputif == "*" or args.outputif == rule.outputif ) ) then
- match = false
- end
-
- -- match flags (the "opt" column)
- if not ( match == true and ( not args.flags or rule.flags == args.flags ) ) then
- match = false
- end
-
- -- match specific options
- if not ( match == true and ( not args.options or self:_match_options( rule.options, args.options ) ) ) then
- match = false
- end
-
-
- -- insert match
- if match == true then
- table.insert( rv, rule )
- end
- end
-
- return rv
-end
-
-
---[[
-IptParser.resync()
-
-Rebuild the internal lookup table, for example when rules have changed through external commands.
-]]--
-
-function IptParser.resync( self )
- self._rules = { }
- self._chain = nil
- self:_parse_rules()
-end
-
-
---[[
-IptParser._parse_rules()
-
-[internal] Parse iptables output from all tables.
-]]--
-
-function IptParser._parse_rules( self )
-
- for i, tbl in ipairs({ "filter", "nat", "mangle" }) do
-
- for i, rule in ipairs(ffluci.sys.execl("iptables -t " .. tbl .. " --line-numbers -nxvL")) do
-
- if rule:find( "Chain " ) == 1 then
-
- self._chain = rule:gsub("Chain ([^%s]*) .*", "%1")
-
- else
- if rule:find("%d") == 1 then
-
- local rule_parts = ffluci.util.split( rule, "%s+", nil, true )
- local rule_details = { }
-
- rule_details["table"] = tbl
- rule_details["chain"] = _chain
- rule_details["index"] = tonumber(rule_parts[1])
- rule_details["packets"] = tonumber(rule_parts[2])
- rule_details["bytes"] = tonumber(rule_parts[3])
- rule_details["target"] = rule_parts[4]
- rule_details["protocol"] = rule_parts[5]
- rule_details["flags"] = rule_parts[6]
- rule_details["inputif"] = rule_parts[7]
- rule_details["outputif"] = rule_parts[8]
- rule_details["source"] = rule_parts[9]
- rule_details["destination"] = rule_parts[10]
- rule_details["options"] = { }
-
- for i = 11, #rule_parts - 1 do
- rule_details["options"][i-10] = rule_parts[i]
- end
-
- table.insert( self._rules, rule_details )
- end
- end
- end
- end
-end
-
-
---[[
-IptParser._match_options( optlist1, optlist2 )
-
-[internal] Return true if optlist1 contains all elements of optlist2. Return false in all other cases.
-]]--
-
-function IptParser._match_options( self, o1, o2 )
-
- -- construct a hashtable of first options list to speed up lookups
- local oh = { }
- for i, opt in ipairs( o1 ) do oh[opt] = true end
-
- -- iterate over second options list
- -- each string in o2 must be also present in o1
- -- if o2 contains a string which is not found in o1 then return false
- for i, opt in ipairs( o2 ) do
- if not oh[opt] then
- return false
- end
- end
-
- return true
-end
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