1 /*-
2 * Copyright (c) 2014 Pedro Souza <pedrosouza@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28 #include <sys/param.h>
29
30 #include "lua.h"
31 #include "lauxlib.h"
32 #include "lstd.h"
33 #include "lutils.h"
34 #include "bootstrap.h"
35
36 /*
37 * Like loader.perform, except args are passed already parsed
38 * on the stack.
39 */
40 static int
lua_command(lua_State * L)41 lua_command(lua_State *L)
42 {
43 int i;
44 int res = 1;
45 int argc = lua_gettop(L);
46 char **argv;
47
48 argv = malloc(sizeof(char *) * (argc + 1));
49 if (argv == NULL)
50 return 0;
51 for (i = 0; i < argc; i++)
52 argv[i] = (char *)(intptr_t)luaL_checkstring(L, i + 1);
53 argv[argc] = NULL;
54 res = interp_builtin_cmd(argc, argv);
55 free(argv);
56 lua_pushinteger(L, res);
57
58 return 1;
59 }
60
61 static int
lua_has_command(lua_State * L)62 lua_has_command(lua_State *L)
63 {
64 const char *cmd;
65
66 cmd = luaL_checkstring(L, 1);
67 if (interp_has_builtin_cmd(cmd)) {
68 lua_pushboolean(L, 1);
69 return 1;
70 }
71
72 lua_pushnil(L);
73 lua_pushstring(L, "Builtin command not found");
74 return 2;
75 }
76
77 static int
lua_has_feature(lua_State * L)78 lua_has_feature(lua_State *L)
79 {
80 const char *feature;
81 char *msg;
82
83 feature = luaL_checkstring(L, 1);
84
85 if (feature_name_is_enabled(feature)) {
86 lua_pushboolean(L, 1);
87 return 1;
88 }
89
90 lua_pushnil(L);
91 lua_pushstring(L, "Feature not enabled");
92 return 2;
93 }
94
95
96 static int
lua_perform(lua_State * L)97 lua_perform(lua_State *L)
98 {
99 int argc;
100 char **argv;
101 int res = 1;
102
103 if (parse(&argc, &argv, luaL_checkstring(L, 1)) == 0) {
104 res = interp_builtin_cmd(argc, argv);
105 free(argv);
106 }
107 lua_pushinteger(L, res);
108
109 return 1;
110 }
111
112 static int
lua_exit(lua_State * L)113 lua_exit(lua_State *L)
114 {
115 exit(luaL_checkinteger(L, 1));
116 return 0;
117 }
118
119 static int
lua_command_error(lua_State * L)120 lua_command_error(lua_State *L)
121 {
122
123 lua_pushstring(L, command_errbuf);
124 return 1;
125 }
126
127 /*
128 * Accepts a space-delimited loader command and runs it through the standard
129 * loader parsing, as if it were executed at the loader prompt by the user.
130 */
131 static int
lua_interpret(lua_State * L)132 lua_interpret(lua_State *L)
133 {
134 const char *interp_string;
135
136 if (lua_gettop(L) != 1) {
137 lua_pushnil(L);
138 return 1;
139 }
140
141 interp_string = luaL_checkstring(L, 1);
142 lua_pushinteger(L, interp_run(interp_string));
143 return 1;
144 }
145
146 static int
lua_parse(lua_State * L)147 lua_parse(lua_State *L)
148 {
149 int argc, nargc;
150 char **argv;
151
152 if (parse(&argc, &argv, luaL_checkstring(L, 1)) == 0) {
153 for (nargc = 0; nargc < argc; ++nargc) {
154 lua_pushstring(L, argv[nargc]);
155 }
156 free(argv);
157 return nargc;
158 }
159
160 lua_pushnil(L);
161 return 1;
162 }
163
164 static int
lua_getchar(lua_State * L)165 lua_getchar(lua_State *L)
166 {
167
168 lua_pushinteger(L, getchar());
169 return 1;
170 }
171
172 static int
lua_ischar(lua_State * L)173 lua_ischar(lua_State *L)
174 {
175
176 lua_pushboolean(L, ischar());
177 return 1;
178 }
179
180 static int
lua_gets(lua_State * L)181 lua_gets(lua_State *L)
182 {
183 char buf[129];
184
185 ngets(buf, 128);
186 lua_pushstring(L, buf);
187 return 1;
188 }
189
190 static int
lua_time(lua_State * L)191 lua_time(lua_State *L)
192 {
193
194 lua_pushinteger(L, time(NULL));
195 return 1;
196 }
197
198 static int
lua_delay(lua_State * L)199 lua_delay(lua_State *L)
200 {
201
202 delay((int)luaL_checknumber(L, 1));
203 return 0;
204 }
205
206 static int
lua_getenv(lua_State * L)207 lua_getenv(lua_State *L)
208 {
209 lua_pushstring(L, getenv(luaL_checkstring(L, 1)));
210
211 return 1;
212 }
213
214 static int
lua_setenv(lua_State * L)215 lua_setenv(lua_State *L)
216 {
217 const char *key, *val;
218
219 key = luaL_checkstring(L, 1);
220 val = luaL_checkstring(L, 2);
221 lua_pushinteger(L, setenv(key, val, 1));
222
223 return 1;
224 }
225
226 static int
lua_unsetenv(lua_State * L)227 lua_unsetenv(lua_State *L)
228 {
229 const char *ev;
230
231 ev = luaL_checkstring(L, 1);
232 lua_pushinteger(L, unsetenv(ev));
233
234 return 1;
235 }
236
237 static int
lua_printc(lua_State * L)238 lua_printc(lua_State *L)
239 {
240 ssize_t cur, l;
241 const char *s = luaL_checklstring(L, 1, &l);
242
243 for (cur = 0; cur < l; ++cur)
244 putchar((unsigned char)*(s++));
245
246 return 1;
247 }
248
249 static int
lua_openfile(lua_State * L)250 lua_openfile(lua_State *L)
251 {
252 const char *mode, *str;
253 int nargs;
254
255 nargs = lua_gettop(L);
256 if (nargs < 1 || nargs > 2) {
257 lua_pushnil(L);
258 return 1;
259 }
260 str = lua_tostring(L, 1);
261 mode = "r";
262 if (nargs > 1) {
263 mode = lua_tostring(L, 2);
264 if (mode == NULL) {
265 lua_pushnil(L);
266 return 1;
267 }
268 }
269 FILE * f = fopen(str, mode);
270 if (f != NULL) {
271 FILE ** ptr = (FILE**)lua_newuserdata(L, sizeof(FILE**));
272 *ptr = f;
273 } else
274 lua_pushnil(L);
275 return 1;
276 }
277
278 static int
lua_closefile(lua_State * L)279 lua_closefile(lua_State *L)
280 {
281 FILE ** f;
282 if (lua_gettop(L) != 1) {
283 lua_pushboolean(L, 0);
284 return 1;
285 }
286
287 f = (FILE**)lua_touserdata(L, 1);
288 if (f != NULL && *f != NULL) {
289 lua_pushboolean(L, fclose(*f) == 0 ? 1 : 0);
290 *f = NULL;
291 } else
292 lua_pushboolean(L, 0);
293
294 return 1;
295 }
296
297 static int
lua_readfile(lua_State * L)298 lua_readfile(lua_State *L)
299 {
300 FILE **f;
301 size_t size, r;
302 char * buf;
303
304 if (lua_gettop(L) < 1 || lua_gettop(L) > 2) {
305 lua_pushnil(L);
306 lua_pushinteger(L, 0);
307 return 2;
308 }
309
310 f = (FILE**)lua_touserdata(L, 1);
311
312 if (f == NULL || *f == NULL) {
313 lua_pushnil(L);
314 lua_pushinteger(L, 0);
315 return 2;
316 }
317
318 if (lua_gettop(L) == 2)
319 size = (size_t)lua_tonumber(L, 2);
320 else
321 size = (*f)->size;
322
323
324 buf = (char*)malloc(size);
325 r = fread(buf, 1, size, *f);
326 lua_pushlstring(L, buf, r);
327 free(buf);
328 lua_pushinteger(L, r);
329
330 return 2;
331 }
332
333 /*
334 * Implements io.write(file, ...)
335 * Any number of string and number arguments may be passed to it,
336 * and it will return the number of bytes written, or nil, an error string, and
337 * the errno.
338 */
339 static int
lua_writefile(lua_State * L)340 lua_writefile(lua_State *L)
341 {
342 FILE **f;
343 const char *buf;
344 int i, nargs;
345 size_t bufsz, w, wrsz;
346
347 buf = NULL;
348 bufsz = 0;
349 w = 0;
350 wrsz = 0;
351 nargs = lua_gettop(L);
352 if (nargs < 2) {
353 errno = EINVAL;
354 return luaL_fileresult(L, 0, NULL);
355 }
356
357 f = (FILE**)lua_touserdata(L, 1);
358
359 if (f == NULL || *f == NULL) {
360 errno = EINVAL;
361 return luaL_fileresult(L, 0, NULL);
362 }
363
364 /* Do a validation pass first */
365 for (i = 0; i < nargs - 1; i++) {
366 /*
367 * With Lua's API, lua_isstring really checks if the argument
368 * is a string or a number. The latter will be implicitly
369 * converted to a string by our later call to lua_tolstring.
370 */
371 if (!lua_isstring(L, i + 2)) {
372 errno = EINVAL;
373 return luaL_fileresult(L, 0, NULL);
374 }
375 }
376 for (i = 0; i < nargs - 1; i++) {
377 /* We've already validated; there's no chance of failure */
378 buf = lua_tolstring(L, i + 2, &bufsz);
379 wrsz = fwrite(buf, 1, bufsz, *f);
380 if (wrsz < bufsz)
381 return luaL_fileresult(L, 0, NULL);
382 w += wrsz;
383 }
384 lua_pushinteger(L, w);
385 return 1;
386 }
387
388 #define REG_SIMPLE(n) { #n, lua_ ## n }
389 static const struct luaL_Reg loaderlib[] = {
390 REG_SIMPLE(command),
391 REG_SIMPLE(command_error),
392 REG_SIMPLE(delay),
393 REG_SIMPLE(exit),
394 REG_SIMPLE(getenv),
395 REG_SIMPLE(has_command),
396 REG_SIMPLE(has_feature),
397 REG_SIMPLE(interpret),
398 REG_SIMPLE(parse),
399 REG_SIMPLE(perform),
400 REG_SIMPLE(printc), /* Also registered as the global 'printc' */
401 REG_SIMPLE(setenv),
402 REG_SIMPLE(time),
403 REG_SIMPLE(unsetenv),
404 { NULL, NULL },
405 };
406
407 static const struct luaL_Reg iolib[] = {
408 { "close", lua_closefile },
409 REG_SIMPLE(getchar),
410 REG_SIMPLE(gets),
411 REG_SIMPLE(ischar),
412 { "open", lua_openfile },
413 { "read", lua_readfile },
414 { "write", lua_writefile },
415 { NULL, NULL },
416 };
417 #undef REG_SIMPLE
418
419 static void
lua_add_feature(void * cookie,const char * name,const char * desc,bool enabled)420 lua_add_feature(void *cookie, const char *name, const char *desc, bool enabled)
421 {
422 lua_State *L = cookie;
423
424 /*
425 * The feature table consists solely of features that are enabled, and
426 * their associated descriptions for debugging purposes.
427 */
428 lua_pushstring(L, desc);
429 lua_setfield(L, -2, name);
430 }
431
432 static void
lua_add_features(lua_State * L)433 lua_add_features(lua_State *L)
434 {
435
436 lua_newtable(L);
437 feature_iter(&lua_add_feature, L);
438
439 /*
440 * We should still have just the table on the stack after we're done
441 * iterating.
442 */
443 lua_setfield(L, -2, "features");
444 }
445
446 int
luaopen_loader(lua_State * L)447 luaopen_loader(lua_State *L)
448 {
449 luaL_newlib(L, loaderlib);
450 /* Add loader.machine and loader.machine_arch properties */
451 lua_pushstring(L, MACHINE);
452 lua_setfield(L, -2, "machine");
453 lua_pushstring(L, MACHINE_ARCH);
454 lua_setfield(L, -2, "machine_arch");
455 lua_pushstring(L, LUA_PATH);
456 lua_setfield(L, -2, "lua_path");
457 lua_pushinteger(L, bootprog_rev);
458 lua_setfield(L, -2, "version");
459 lua_pushinteger(L, CMD_OK);
460 lua_setfield(L, -2, "CMD_OK");
461 lua_pushinteger(L, CMD_WARN);
462 lua_setfield(L, -2, "CMD_WARN");
463 lua_pushinteger(L, CMD_ERROR);
464 lua_setfield(L, -2, "CMD_ERROR");
465 lua_pushinteger(L, CMD_CRIT);
466 lua_setfield(L, -2, "CMD_CRIT");
467 lua_pushinteger(L, CMD_FATAL);
468 lua_setfield(L, -2, "CMD_FATAL");
469 lua_add_features(L);
470 /* Set global printc to loader.printc */
471 lua_register(L, "printc", lua_printc);
472 return 1;
473 }
474
475 int
luaopen_io(lua_State * L)476 luaopen_io(lua_State *L)
477 {
478 luaL_newlib(L, iolib);
479 return 1;
480 }
481