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-- LuaJIT ffi bindings for zscanner, a DNS zone parser.
-- Author: Marek Vavrusa <marek.vavrusa@nic.cz>
local ffi = require('ffi')
local libzscanner = ffi.load(libzscanner_SONAME)
-- Wrap scanner context
local zs_scanner_t = ffi.typeof('zs_scanner_t')
ffi.metatype( zs_scanner_t, {
__gc = function(zs) return libzscanner.zs_deinit(zs) end,
__new = function(ct, origin, class, ttl)
if not class then class = 1 end
if not ttl then ttl = 3600 end
local parser = ffi.new(ct)
libzscanner.zs_init(parser, origin, class, ttl)
return parser
end,
__index = {
open = function (zs, file)
assert(ffi.istype(zs, zs_scanner_t))
local ret = libzscanner.zs_set_input_file(zs, file)
if ret ~= 0 then return false, zs:strerr() end
return true
end,
parse = function(zs, input)
assert(ffi.istype(zs, zs_scanner_t))
if input ~= nil then libzscanner.zs_set_input_string(zs, input, #input) end
local ret = libzscanner.zs_parse_record(zs)
-- Return current state only when parsed correctly, otherwise return error
if ret == 0 and zs.state ~= "ZS_STATE_ERROR" then
return zs.state == "ZS_STATE_DATA"
else
return false, zs:strerr()
end
end,
current_rr = function(zs)
assert(ffi.istype(zs, zs_scanner_t))
return {
owner = ffi.string(zs.r_owner, zs.r_owner_length),
ttl = tonumber(zs.r_ttl),
class = tonumber(zs.r_class),
type = tonumber(zs.r_type),
rdata = ffi.string(zs.r_data, zs.r_data_length),
comment = zs:current_comment(),
}
end,
strerr = function(zs)
assert(ffi.istype(zs, zs_scanner_t))
return ffi.string(libzscanner.zs_strerror(zs.error.code))
end,
current_comment = function(zs)
if zs.buffer_length > 0 then
return ffi.string(zs.buffer, zs.buffer_length - 1)
else
return nil
end
end
},
})
-- Module API
local rrparser = {
new = zs_scanner_t,
-- Parse a file into a list of RRs
file = function (path)
local zs = zs_scanner_t()
local ok, err = zs:open(path)
if not ok then
return ok, err
end
local results = {}
while zs:parse() do
table.insert(results, zs:current_rr())
end
return results
end,
-- Parse a string into a list of RRs.
string = function (input)
local zs = zs_scanner_t()
local results = {}
local ok = zs:parse(input)
while ok do
table.insert(results, zs:current_rr())
ok = zs:parse()
end
return results
end,
}
return rrparser
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