mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-11-04 20:50:37 -08:00
483 lines
14 KiB
C
483 lines
14 KiB
C
/*
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** $Id: ldblib.c $
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** Interface from Lua to its debug API
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** See Copyright Notice in lua.h
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*/
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#define ldblib_c
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#define LUA_LIB
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#include "lprefix.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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/*
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** The hook table at registry[HOOKKEY] maps threads to their current
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** hook function.
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*/
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static const char *const HOOKKEY = "_HOOKKEY";
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/*
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** If L1 != L, L1 can be in any state, and therefore there are no
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** guarantees about its stack space; any push in L1 must be
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** checked.
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*/
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static void checkstack(lua_State *L, lua_State *L1, int n) {
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if (l_unlikely(L != L1 && !lua_checkstack(L1, n)))
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luaL_error(L, "stack overflow");
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}
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static int db_getregistry(lua_State *L) {
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lua_pushvalue(L, LUA_REGISTRYINDEX);
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return 1;
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}
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static int db_getmetatable(lua_State *L) {
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luaL_checkany(L, 1);
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if (!lua_getmetatable(L, 1)) {
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lua_pushnil(L); /* no metatable */
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}
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return 1;
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}
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static int db_setmetatable(lua_State *L) {
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int t = lua_type(L, 2);
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luaL_argexpected(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table");
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lua_settop(L, 2);
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lua_setmetatable(L, 1);
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return 1; /* return 1st argument */
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}
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static int db_getuservalue(lua_State *L) {
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int n = (int)luaL_optinteger(L, 2, 1);
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if (lua_type(L, 1) != LUA_TUSERDATA)
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luaL_pushfail(L);
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else if (lua_getiuservalue(L, 1, n) != LUA_TNONE) {
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lua_pushboolean(L, 1);
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return 2;
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}
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return 1;
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}
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static int db_setuservalue(lua_State *L) {
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int n = (int)luaL_optinteger(L, 3, 1);
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luaL_checktype(L, 1, LUA_TUSERDATA);
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luaL_checkany(L, 2);
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lua_settop(L, 2);
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if (!lua_setiuservalue(L, 1, n))
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luaL_pushfail(L);
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return 1;
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}
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/*
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** Auxiliary function used by several library functions: check for
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** an optional thread as function's first argument and set 'arg' with
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** 1 if this argument is present (so that functions can skip it to
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** access their other arguments)
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*/
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static lua_State *getthread(lua_State *L, int *arg) {
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if (lua_isthread(L, 1)) {
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*arg = 1;
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return lua_tothread(L, 1);
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} else {
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*arg = 0;
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return L; /* function will operate over current thread */
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}
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}
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/*
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** Variations of 'lua_settable', used by 'db_getinfo' to put results
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** from 'lua_getinfo' into result table. Key is always a string;
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** value can be a string, an int, or a boolean.
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*/
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static void settabss(lua_State *L, const char *k, const char *v) {
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lua_pushstring(L, v);
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lua_setfield(L, -2, k);
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}
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static void settabsi(lua_State *L, const char *k, int v) {
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lua_pushinteger(L, v);
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lua_setfield(L, -2, k);
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}
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static void settabsb(lua_State *L, const char *k, int v) {
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lua_pushboolean(L, v);
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lua_setfield(L, -2, k);
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}
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/*
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** In function 'db_getinfo', the call to 'lua_getinfo' may push
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** results on the stack; later it creates the result table to put
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** these objects. Function 'treatstackoption' puts the result from
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** 'lua_getinfo' on top of the result table so that it can call
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** 'lua_setfield'.
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*/
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static void treatstackoption(lua_State *L, lua_State *L1, const char *fname) {
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if (L == L1)
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lua_rotate(L, -2, 1); /* exchange object and table */
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else
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lua_xmove(L1, L, 1); /* move object to the "main" stack */
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lua_setfield(L, -2, fname); /* put object into table */
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}
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/*
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** Calls 'lua_getinfo' and collects all results in a new table.
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** L1 needs stack space for an optional input (function) plus
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** two optional outputs (function and line table) from function
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** 'lua_getinfo'.
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*/
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static int db_getinfo(lua_State *L) {
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lua_Debug ar;
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int arg;
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lua_State *L1 = getthread(L, &arg);
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const char *options = luaL_optstring(L, arg + 2, "flnSrtu");
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checkstack(L, L1, 3);
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luaL_argcheck(L, options[0] != '>', arg + 2, "invalid option '>'");
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if (lua_isfunction(L, arg + 1)) { /* info about a function? */
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options = lua_pushfstring(L, ">%s", options); /* add '>' to 'options' */
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lua_pushvalue(L, arg + 1); /* move function to 'L1' stack */
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lua_xmove(L, L1, 1);
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} else { /* stack level */
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if (!lua_getstack(L1, (int)luaL_checkinteger(L, arg + 1), &ar)) {
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luaL_pushfail(L); /* level out of range */
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return 1;
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}
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}
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if (!lua_getinfo(L1, options, &ar))
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return luaL_argerror(L, arg + 2, "invalid option");
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lua_newtable(L); /* table to collect results */
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if (strchr(options, 'S')) {
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lua_pushlstring(L, ar.source, ar.srclen);
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lua_setfield(L, -2, "source");
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settabss(L, "short_src", ar.short_src);
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settabsi(L, "linedefined", ar.linedefined);
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settabsi(L, "lastlinedefined", ar.lastlinedefined);
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settabss(L, "what", ar.what);
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}
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if (strchr(options, 'l'))
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settabsi(L, "currentline", ar.currentline);
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if (strchr(options, 'u')) {
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settabsi(L, "nups", ar.nups);
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settabsi(L, "nparams", ar.nparams);
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settabsb(L, "isvararg", ar.isvararg);
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}
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if (strchr(options, 'n')) {
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settabss(L, "name", ar.name);
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settabss(L, "namewhat", ar.namewhat);
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}
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if (strchr(options, 'r')) {
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settabsi(L, "ftransfer", ar.ftransfer);
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settabsi(L, "ntransfer", ar.ntransfer);
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}
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if (strchr(options, 't'))
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settabsb(L, "istailcall", ar.istailcall);
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if (strchr(options, 'L'))
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treatstackoption(L, L1, "activelines");
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if (strchr(options, 'f'))
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treatstackoption(L, L1, "func");
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return 1; /* return table */
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}
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static int db_getlocal(lua_State *L) {
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int arg;
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lua_State *L1 = getthread(L, &arg);
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int nvar = (int)luaL_checkinteger(L, arg + 2); /* local-variable index */
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if (lua_isfunction(L, arg + 1)) { /* function argument? */
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lua_pushvalue(L, arg + 1); /* push function */
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lua_pushstring(L, lua_getlocal(L, NULL, nvar)); /* push local name */
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return 1; /* return only name (there is no value) */
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} else { /* stack-level argument */
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lua_Debug ar;
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const char *name;
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int level = (int)luaL_checkinteger(L, arg + 1);
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if (l_unlikely(!lua_getstack(L1, level, &ar))) /* out of range? */
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return luaL_argerror(L, arg + 1, "level out of range");
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checkstack(L, L1, 1);
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name = lua_getlocal(L1, &ar, nvar);
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if (name) {
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lua_xmove(L1, L, 1); /* move local value */
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lua_pushstring(L, name); /* push name */
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lua_rotate(L, -2, 1); /* re-order */
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return 2;
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} else {
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luaL_pushfail(L); /* no name (nor value) */
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return 1;
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}
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}
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}
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static int db_setlocal(lua_State *L) {
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int arg;
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const char *name;
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lua_State *L1 = getthread(L, &arg);
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lua_Debug ar;
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int level = (int)luaL_checkinteger(L, arg + 1);
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int nvar = (int)luaL_checkinteger(L, arg + 2);
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if (l_unlikely(!lua_getstack(L1, level, &ar))) /* out of range? */
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return luaL_argerror(L, arg + 1, "level out of range");
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luaL_checkany(L, arg + 3);
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lua_settop(L, arg + 3);
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checkstack(L, L1, 1);
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lua_xmove(L, L1, 1);
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name = lua_setlocal(L1, &ar, nvar);
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if (name == NULL)
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lua_pop(L1, 1); /* pop value (if not popped by 'lua_setlocal') */
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lua_pushstring(L, name);
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return 1;
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}
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/*
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** get (if 'get' is true) or set an upvalue from a closure
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*/
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static int auxupvalue(lua_State *L, int get) {
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const char *name;
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int n = (int)luaL_checkinteger(L, 2); /* upvalue index */
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luaL_checktype(L, 1, LUA_TFUNCTION); /* closure */
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name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n);
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if (name == NULL) return 0;
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lua_pushstring(L, name);
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lua_insert(L, -(get + 1)); /* no-op if get is false */
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return get + 1;
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}
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static int db_getupvalue(lua_State *L) {
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return auxupvalue(L, 1);
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}
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static int db_setupvalue(lua_State *L) {
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luaL_checkany(L, 3);
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return auxupvalue(L, 0);
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}
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/*
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** Check whether a given upvalue from a given closure exists and
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** returns its index
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*/
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static void *checkupval(lua_State *L, int argf, int argnup, int *pnup) {
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void *id;
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int nup = (int)luaL_checkinteger(L, argnup); /* upvalue index */
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luaL_checktype(L, argf, LUA_TFUNCTION); /* closure */
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id = lua_upvalueid(L, argf, nup);
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if (pnup) {
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luaL_argcheck(L, id != NULL, argnup, "invalid upvalue index");
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*pnup = nup;
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}
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return id;
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}
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static int db_upvalueid(lua_State *L) {
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void *id = checkupval(L, 1, 2, NULL);
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if (id != NULL)
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lua_pushlightuserdata(L, id);
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else
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luaL_pushfail(L);
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return 1;
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}
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static int db_upvaluejoin(lua_State *L) {
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int n1, n2;
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checkupval(L, 1, 2, &n1);
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checkupval(L, 3, 4, &n2);
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luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected");
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luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected");
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lua_upvaluejoin(L, 1, n1, 3, n2);
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return 0;
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}
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/*
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** Call hook function registered at hook table for the current
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** thread (if there is one)
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*/
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static void hookf(lua_State *L, lua_Debug *ar) {
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static const char *const hooknames[] =
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{"call", "return", "line", "count", "tail call"};
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lua_getfield(L, LUA_REGISTRYINDEX, HOOKKEY);
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lua_pushthread(L);
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if (lua_rawget(L, -2) == LUA_TFUNCTION) { /* is there a hook function? */
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lua_pushstring(L, hooknames[(int)ar->event]); /* push event name */
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if (ar->currentline >= 0)
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lua_pushinteger(L, ar->currentline); /* push current line */
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else lua_pushnil(L);
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lua_assert(lua_getinfo(L, "lS", ar));
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lua_call(L, 2, 0); /* call hook function */
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}
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}
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/*
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** Convert a string mask (for 'sethook') into a bit mask
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*/
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static int makemask(const char *smask, int count) {
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int mask = 0;
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if (strchr(smask, 'c')) mask |= LUA_MASKCALL;
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if (strchr(smask, 'r')) mask |= LUA_MASKRET;
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if (strchr(smask, 'l')) mask |= LUA_MASKLINE;
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if (count > 0) mask |= LUA_MASKCOUNT;
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return mask;
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}
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/*
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** Convert a bit mask (for 'gethook') into a string mask
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*/
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static char *unmakemask(int mask, char *smask) {
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int i = 0;
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if (mask & LUA_MASKCALL) smask[i++] = 'c';
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if (mask & LUA_MASKRET) smask[i++] = 'r';
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if (mask & LUA_MASKLINE) smask[i++] = 'l';
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smask[i] = '\0';
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return smask;
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}
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static int db_sethook(lua_State *L) {
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int arg, mask, count;
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lua_Hook func;
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lua_State *L1 = getthread(L, &arg);
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if (lua_isnoneornil(L, arg + 1)) { /* no hook? */
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lua_settop(L, arg + 1);
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func = NULL;
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mask = 0;
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count = 0; /* turn off hooks */
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} else {
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const char *smask = luaL_checkstring(L, arg + 2);
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luaL_checktype(L, arg + 1, LUA_TFUNCTION);
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count = (int)luaL_optinteger(L, arg + 3, 0);
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func = hookf;
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mask = makemask(smask, count);
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}
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if (!luaL_getsubtable(L, LUA_REGISTRYINDEX, HOOKKEY)) {
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/* table just created; initialize it */
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lua_pushliteral(L, "k");
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lua_setfield(L, -2, "__mode"); /** hooktable.__mode = "k" */
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lua_pushvalue(L, -1);
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lua_setmetatable(L, -2); /* metatable(hooktable) = hooktable */
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}
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checkstack(L, L1, 1);
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lua_pushthread(L1);
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lua_xmove(L1, L, 1); /* key (thread) */
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lua_pushvalue(L, arg + 1); /* value (hook function) */
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lua_rawset(L, -3); /* hooktable[L1] = new Lua hook */
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lua_sethook(L1, func, mask, count);
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return 0;
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}
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static int db_gethook(lua_State *L) {
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int arg;
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lua_State *L1 = getthread(L, &arg);
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char buff[5];
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int mask = lua_gethookmask(L1);
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lua_Hook hook = lua_gethook(L1);
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if (hook == NULL) { /* no hook? */
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luaL_pushfail(L);
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return 1;
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} else if (hook != hookf) /* external hook? */
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lua_pushliteral(L, "external hook");
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else { /* hook table must exist */
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lua_getfield(L, LUA_REGISTRYINDEX, HOOKKEY);
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checkstack(L, L1, 1);
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lua_pushthread(L1);
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lua_xmove(L1, L, 1);
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lua_rawget(L, -2); /* 1st result = hooktable[L1] */
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lua_remove(L, -2); /* remove hook table */
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}
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lua_pushstring(L, unmakemask(mask, buff)); /* 2nd result = mask */
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lua_pushinteger(L, lua_gethookcount(L1)); /* 3rd result = count */
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return 3;
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}
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static int db_debug(lua_State *L) {
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for (;;) {
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char buffer[250];
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lua_writestringerror("%s", "lua_debug> ");
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if (fgets(buffer, sizeof(buffer), stdin) == NULL ||
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strcmp(buffer, "cont\n") == 0)
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return 0;
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if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") ||
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lua_pcall(L, 0, 0, 0))
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lua_writestringerror("%s\n", luaL_tolstring(L, -1, NULL));
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lua_settop(L, 0); /* remove eventual returns */
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}
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}
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static int db_traceback(lua_State *L) {
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int arg;
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lua_State *L1 = getthread(L, &arg);
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const char *msg = lua_tostring(L, arg + 1);
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if (msg == NULL && !lua_isnoneornil(L, arg + 1)) /* non-string 'msg'? */
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lua_pushvalue(L, arg + 1); /* return it untouched */
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else {
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int level = (int)luaL_optinteger(L, arg + 2, (L == L1) ? 1 : 0);
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luaL_traceback(L, L1, msg, level);
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}
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return 1;
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}
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static int db_setcstacklimit(lua_State *L) {
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int limit = (int)luaL_checkinteger(L, 1);
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int res = lua_setcstacklimit(L, limit);
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lua_pushinteger(L, res);
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return 1;
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}
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static const luaL_Reg dblib[] = {
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{"debug", db_debug},
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{"getuservalue", db_getuservalue},
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{"gethook", db_gethook},
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{"getinfo", db_getinfo},
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{"getlocal", db_getlocal},
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{"getregistry", db_getregistry},
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{"getmetatable", db_getmetatable},
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{"getupvalue", db_getupvalue},
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{"upvaluejoin", db_upvaluejoin},
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{"upvalueid", db_upvalueid},
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{"setuservalue", db_setuservalue},
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{"sethook", db_sethook},
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{"setlocal", db_setlocal},
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{"setmetatable", db_setmetatable},
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{"setupvalue", db_setupvalue},
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{"traceback", db_traceback},
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{"setcstacklimit", db_setcstacklimit},
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{NULL, NULL}
|
|
};
|
|
|
|
|
|
LUAMOD_API int luaopen_debug(lua_State *L) {
|
|
luaL_newlib(L, dblib);
|
|
return 1;
|
|
}
|
|
|