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|
-- luatex-core security and io overloads ..
-- if not modules then modules = { } end modules ['luatex-core'] = {
-- version = 1.112,
-- comment = 'companion to luatex',
-- author = 'Hans Hagen & Luigi Scarso',
-- copyright = 'LuaTeX Development Team',
-- }
LUATEXCOREVERSION = 1.120 -- we reflect the luatex version where changes happened
-- This file overloads some Lua functions. The readline variants provide the same
-- functionality as LuaTeX <= 1.04 and doing it this way permits us to keep the
-- original io libraries clean. Performance is probably even a bit better now.
-- We test for functions already being defined so that we don't overload ones that
-- are provided in the startup script.
local saferoption = status.safer_option
local shellescape = status.shell_escape -- 0 (disabled) 1 (anything) 2 (restricted)
local kpseused = status.kpse_used -- 0 1
if kpseused == 1 then
local type = type
local gsub = string.gsub
local find = string.find
local mt = getmetatable(io.stderr)
local mt_lines = mt.lines
local kpse_checkpermission = kpse.check_permission
local kpse_recordinputfile = kpse.record_input_file
local kpse_recordoutputfile = kpse.record_output_file
local io_open = io.open
local io_popen = io.popen
local io_lines = io.lines
local fio_readline = fio.readline
local write_nl = texio.write_nl
io.saved_lines = io_lines -- always readonly
mt.saved_lines = mt_lines -- always readonly
local function luatex_io_open(name,how)
if not how then
how = 'r'
end
local f = io_open(name,how)
if f then
if type(how) == 'string' and find(how,'w') then
kpse_recordoutputfile(name,'w')
else
kpse_recordinputfile(name,'r')
end
end
return f
end
local function luatex_io_open_readonly(name,how)
if not how then
how = 'r'
else
how = gsub(how,'[^rb]','')
if how == '' then
how = 'r'
end
end
local f = io_open(name,how)
if f then
fio_recordfilename(name,'r')
end
return f
end
local function luatex_io_popen(name,...)
local okay, found = kpse_checkpermission(name)
if okay and found then
return io_popen(found,...)
end
end
-- local function luatex_io_lines(name,how)
-- if name then
-- local f = io_open(name,how or 'r')
-- if f then
-- return function()
-- return fio_readline(f)
-- end
-- end
-- else
-- return io_lines()
-- end
-- end
-- For some reason the gc doesn't kick in so we need to close explicitly
-- so that the handle is flushed.
local error, type = error, type
local function luatex_io_lines(name,how)
if type(name) == "string" then
local f = io_open(name,how or 'r')
if f then
return function()
local l = fio_readline(f)
if not l then
f:close()
end
return l
end
else
-- for those who like it this way:
error("patched 'io.lines' can't open '" .. name .. "'")
end
else
return io_lines()
end
end
local function luatex_io_readline(f)
return function()
return fio_readline(f)
end
end
io.lines = luatex_io_lines
mt.lines = luatex_io_readline
io.open = luatex_io_open
io.popen = luatex_io_popen
else
-- we assume management elsewhere
end
-- maybe also only when in kpse mode
if saferoption == 1 then
local write_nl = texio.write_nl
local format = string.format
local function installdummy(str,f)
local reported = false
return function(...)
if not reported then
write_nl(format("safer option set, function %q is %s",
str,f and "limited" or "disabled"))
reported = true
end
if f then
return f(...)
end
end
end
local function installlimit(str,f)
local reported = false
end
os.execute = installdummy("os.execute")
os.spawn = installdummy("os.spawn")
os.exec = installdummy("os.exec")
os.setenv = installdummy("os.setenv")
os.tempdir = installdummy("os.tempdir")
io.popen = installdummy("io.popen")
io.open = installdummy("io.open",luatex_io_open_readonly)
os.rename = installdummy("os.rename")
os.remove = installdummy("os.remove")
io.tmpfile = installdummy("io.tmpfile")
io.output = installdummy("io.output")
lfs.chdir = installdummy("lfs.chdir")
lfs.lock = installdummy("lfs.lock")
lfs.touch = installdummy("lfs.touch")
lfs.rmdir = installdummy("lfs.rmdir")
lfs.mkdir = installdummy("lfs.mkdir")
debug = nil
-- os.[execute|os.spawn|os.exec] already are shellescape aware)
end
-- maybe also only when in kpse mode
if saferoption == 1 or shellescape ~= 1 then
package.loadlib = function() end
package.searchers[4] = nil
package.searchers[3] = nil
ffi = require('ffi')
if ffi then
for k, v in next, ffi do
if k ~= 'gc' then
ffi[k] = nil
end
end
end
ffi = nil
end
if md5 then
local sum = md5.sum
local gsub = string.gsub
local format = string.format
local byte = string.byte
if not md5.sumhexa then
function md5.sumhexa(k)
return (gsub(sum(k), ".", function(c)
return format("%02x",byte(c))
end))
end
end
if not md5.sumHEXA then
function md5.sumHEXA(k)
return (gsub(sum(k), ".", function(c)
return format("%02X",byte(c))
end))
end
end
end
-- compatibility: this might go away
if not unpack then
unpack = table.unpack
end
if not package.loaders then
package.loaders = package.searchers
end
if not loadstring then
loadstring = load
end
-- compatibility: this might stay
if bit32 then
-- lua 5.2: we're okay
elseif utf8 then
-- lua 5.3: bitwise.lua, v 1.24 2014/12/26 17:20:53 roberto
bit32 = load ( [[
local select = select -- instead of: arg = { ... }
bit32 = {
bnot = function (a)
return ~a & 0xFFFFFFFF
end,
band = function (x, y, z, ...)
if not z then
return ((x or -1) & (y or -1)) & 0xFFFFFFFF
else
local res = x & y & z
for i=1,select("#",...) do
res = res & select(i,...)
end
return res & 0xFFFFFFFF
end
end,
bor = function (x, y, z, ...)
if not z then
return ((x or 0) | (y or 0)) & 0xFFFFFFFF
else
local res = x | y | z
for i=1,select("#",...) do
res = res | select(i,...)
end
return res & 0xFFFFFFFF
end
end,
bxor = function (x, y, z, ...)
if not z then
return ((x or 0) ~ (y or 0)) & 0xFFFFFFFF
else
local res = x ~ y ~ z
for i=1,select("#",...) do
res = res ~ select(i,...)
end
return res & 0xFFFFFFFF
end
end,
btest = function (x, y, z, ...)
if not z then
return (((x or -1) & (y or -1)) & 0xFFFFFFFF) ~= 0
else
local res = x & y & z
for i=1,select("#",...) do
res = res & select(i,...)
end
return (res & 0xFFFFFFFF) ~= 0
end
end,
lshift = function (a, b)
return ((a & 0xFFFFFFFF) << b) & 0xFFFFFFFF
end,
rshift = function (a, b)
return ((a & 0xFFFFFFFF) >> b) & 0xFFFFFFFF
end,
arshift = function (a, b)
a = a & 0xFFFFFFFF
if b <= 0 or (a & 0x80000000) == 0 then
return (a >> b) & 0xFFFFFFFF
else
return ((a >> b) | ~(0xFFFFFFFF >> b)) & 0xFFFFFFFF
end
end,
lrotate = function (a ,b)
b = b & 31
a = a & 0xFFFFFFFF
a = (a << b) | (a >> (32 - b))
return a & 0xFFFFFFFF
end,
rrotate = function (a, b)
b = -b & 31
a = a & 0xFFFFFFFF
a = (a << b) | (a >> (32 - b))
return a & 0xFFFFFFFF
end,
extract = function (a, f, w)
return (a >> f) & ~(-1 << (w or 1))
end,
replace = function (a, v, f, w)
local mask = ~(-1 << (w or 1))
return ((a & ~(mask << f)) | ((v & mask) << f)) & 0xFFFFFFFF
end,
}
]] )
elseif bit then
-- luajit (for now)
bit32 = load ( [[
local band, bnot, rshift, lshift = bit.band, bit.bnot, bit.rshift, bit.lshift
bit32 = {
arshift = bit.arshift,
band = band,
bnot = bnot,
bor = bit.bor,
bxor = bit.bxor,
btest = function(...)
return band(...) ~= 0
end,
extract = function(a,f,w)
return band(rshift(a,f),2^(w or 1)-1)
end,
lrotate = bit.rol,
lshift = lshift,
replace = function(a,v,f,w)
local mask = 2^(w or 1)-1
return band(a,bnot(lshift(mask,f)))+lshift(band(v,mask),f)
end,
rrotate = bit.ror,
rshift = rshift,
}
]] )
else
-- hope for the best or fail
bit32 = require("bit32")
end
-- this is needed for getting require("socket") right
do
local loaded = package.loaded
if not loaded.socket then loaded.socket = loaded["socket.core"] end
if not loaded.mime then loaded.mime = loaded["mime.core"] end
if not loaded.lfs then loaded.lfs = lfs end
end
do
local lfsattributes = lfs.attributes
local symlinkattributes = lfs.symlinkattributes
-- these can now be done using lfs (was dead slow before)
if not lfs.isfile then
function lfs.isfile(name)
local m = lfsattributes(name,"mode")
return m == "file" or m == "link"
end
end
if not lfs.isdir then
function lfs.isdir(name)
local m = lfsattributes(name,"mode")
return m == "directory"
end
end
-- shortnames have also be sort of dropped from kpse
if not lfs.shortname then
function lfs.shortname(name)
return name
end
end
-- now there is a target field, so ...
if not lfs.readlink then
function lfs.readlink(name)
return symlinkattributes(name,"target") or nil
end
end
end
-- start omit
if utilities and utilities.merger and utilities.merger.compact then
local byte, format, gmatch, gsub = string.byte, string.format, string.gmatch, string.gsub
local concat = table.concat
local data = io.loaddata('luatex-core.lua')
data = gsub(data,'%-%-%s*start%s*omit.-%-%-%s*stop%s*omit%s*','')
data = gsub(data,'\r\n','\n')
local t = { }
local r = { }
local n = 0
local s = utilities.merger.compact(data) -- no comments and less spaces
t[#t+1] = '/* generated from and by luatex-core.lua */'
t[#t+1] = ''
t[#t+1] = '#include "lua.h"'
t[#t+1] = '#include "lauxlib.h"'
t[#t+1] = ''
t[#t+1] = 'int load_luatex_core_lua (lua_State * L);'
t[#t+1] = ''
t[#t+1] = 'int load_luatex_core_lua (lua_State * L)'
t[#t+1] = '{'
t[#t+1] = ' static unsigned char luatex_core_lua[] = {'
for c in gmatch(data,'.') do
if n == 16 then
n = 1
t[#t+1] = ' ' .. concat(r,', ') .. ','
else
n = n + 1
end
r[n] = format('0x%02x',byte(c))
end
n = n + 1
r[n] = '0x00'
t[#t+1] = ' ' .. concat(r,', ',1,n)
t[#t+1] = ' };'
-- t[#t+1] = format('unsigned int luatex_core_lua_len = 0x%x;',#d+1)
t[#t+1] = ' return luaL_dostring(L, (const char*) luatex_core_lua);'
t[#t+1] = '}'
io.savedata('luatex-core.c',concat(t,'\n'))
io.savedata('luatex-core-stripped.lua',s)
end
-- stop omit
|