2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #include "json_script.h"
23 struct json_script_ctx *ctx;
24 struct blob_attr *vars;
30 int (*cb)(struct json_call *call, struct blob_attr *cur);
33 static int json_process_expr(struct json_call *call, struct blob_attr *cur);
34 static int json_process_cmd(struct json_call *call, struct blob_attr *cur);
35 static int eval_string(struct json_call *call, struct blob_buf *buf, const char *name, const char *pattern);
37 struct json_script_file *
38 json_script_file_from_blobmsg(const char *name, void *data, int len)
40 struct json_script_file *f;
45 name_len = strlen(name) + 1;
47 f = calloc_a(sizeof(*f) + len, &new_name, name_len);
51 memcpy(f->data, data, len);
53 f->avl.key = strcpy(new_name, name);
58 static struct json_script_file *
59 json_script_get_file(struct json_script_ctx *ctx, const char *filename)
61 struct json_script_file *f;
63 f = avl_find_element(&ctx->files, filename, f, avl);
67 f = ctx->handle_file(ctx, filename);
71 avl_insert(&ctx->files, &f->avl);
75 static void __json_script_run(struct json_call *call, struct json_script_file *file,
76 struct blob_attr *context)
78 struct json_script_ctx *ctx = call->ctx;
80 if (file->seq == call->seq) {
82 ctx->handle_error(ctx, "Recursive include", context);
87 file->seq = call->seq;
89 json_process_cmd(call, file->data);
94 const char *json_script_find_var(struct json_script_ctx *ctx, struct blob_attr *vars,
97 struct blob_attr *cur;
100 blobmsg_for_each_attr(cur, vars, rem) {
101 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
104 if (strcmp(blobmsg_name(cur), name) != 0)
107 return blobmsg_data(cur);
110 return ctx->handle_var(ctx, name, vars);
114 msg_find_var(struct json_call *call, const char *name)
116 return json_script_find_var(call->ctx, call->vars, name);
120 json_get_tuple(struct blob_attr *cur, struct blob_attr **tb, int t1, int t2)
122 static struct blobmsg_policy expr_tuple[3] = {
123 { .type = BLOBMSG_TYPE_STRING },
128 expr_tuple[1].type = t1;
129 expr_tuple[2].type = t2;
130 blobmsg_parse_array(expr_tuple, 3, tb, blobmsg_data(cur), blobmsg_data_len(cur));
133 static int handle_if(struct json_call *call, struct blob_attr *expr)
135 struct blob_attr *tb[4];
138 static const struct blobmsg_policy if_tuple[4] = {
139 { .type = BLOBMSG_TYPE_STRING },
140 { .type = BLOBMSG_TYPE_ARRAY },
141 { .type = BLOBMSG_TYPE_ARRAY },
142 { .type = BLOBMSG_TYPE_ARRAY },
145 blobmsg_parse_array(if_tuple, 4, tb, blobmsg_data(expr), blobmsg_data_len(expr));
147 if (!tb[1] || !tb[2])
150 ret = json_process_expr(call, tb[1]);
155 return json_process_cmd(call, tb[2]);
160 return json_process_cmd(call, tb[3]);
163 static int handle_case(struct json_call *call, struct blob_attr *expr)
165 struct blob_attr *tb[3], *cur;
169 json_get_tuple(expr, tb, BLOBMSG_TYPE_STRING, BLOBMSG_TYPE_TABLE);
170 if (!tb[1] || !tb[2])
173 var = msg_find_var(call, blobmsg_data(tb[1]));
177 blobmsg_for_each_attr(cur, tb[2], rem) {
178 if (!strcmp(var, blobmsg_name(cur)))
179 return json_process_cmd(call, cur);
185 static int handle_return(struct json_call *call, struct blob_attr *expr)
190 static int handle_include(struct json_call *call, struct blob_attr *expr)
192 struct blob_attr *tb[3];
193 struct json_script_file *f;
195 json_get_tuple(expr, tb, BLOBMSG_TYPE_STRING, 0);
199 f = json_script_get_file(call->ctx, blobmsg_data(tb[1]));
203 __json_script_run(call, f, expr);
207 static const struct json_handler cmd[] = {
209 { "case", handle_case },
210 { "return", handle_return },
211 { "include", handle_include },
214 static int eq_regex_cmp(const char *str, const char *pattern, bool regex)
220 return !strcmp(str, pattern);
222 if (regcomp(®, pattern, REG_EXTENDED | REG_NOSUB))
225 ret = !regexec(®, str, 0, NULL, 0);
231 static int expr_eq_regex(struct json_call *call, struct blob_attr *expr, bool regex)
233 struct json_script_ctx *ctx = call->ctx;
234 struct blob_attr *tb[3], *cur;
238 json_get_tuple(expr, tb, BLOBMSG_TYPE_STRING, 0);
239 if (!tb[1] || !tb[2])
242 var = msg_find_var(call, blobmsg_data(tb[1]));
246 switch(blobmsg_type(tb[2])) {
247 case BLOBMSG_TYPE_STRING:
248 return eq_regex_cmp(var, blobmsg_data(tb[2]), regex);
249 case BLOBMSG_TYPE_ARRAY:
250 blobmsg_for_each_attr(cur, tb[2], rem) {
251 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING) {
252 ctx->handle_error(ctx, "Unexpected element type", cur);
256 if (eq_regex_cmp(var, blobmsg_data(cur), regex))
261 ctx->handle_error(ctx, "Unexpected element type", tb[2]);
266 static int handle_expr_eq(struct json_call *call, struct blob_attr *expr)
268 return expr_eq_regex(call, expr, false);
271 static int handle_expr_regex(struct json_call *call, struct blob_attr *expr)
273 return expr_eq_regex(call, expr, true);
276 static int handle_expr_has(struct json_call *call, struct blob_attr *expr)
278 struct json_script_ctx *ctx = call->ctx;
279 struct blob_attr *tb[3], *cur;
282 json_get_tuple(expr, tb, 0, 0);
286 switch(blobmsg_type(tb[1])) {
287 case BLOBMSG_TYPE_STRING:
288 return !!msg_find_var(call, blobmsg_data(tb[1]));
289 case BLOBMSG_TYPE_ARRAY:
290 blobmsg_for_each_attr(cur, tb[1], rem) {
291 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING) {
292 ctx->handle_error(ctx, "Unexpected element type", cur);
296 if (msg_find_var(call, blobmsg_data(cur)))
301 ctx->handle_error(ctx, "Unexpected element type", tb[1]);
306 static int expr_and_or(struct json_call *call, struct blob_attr *expr, bool and)
308 struct blob_attr *cur;
313 blobmsg_for_each_attr(cur, expr, rem) {
317 ret = json_process_expr(call, cur);
328 static int handle_expr_and(struct json_call *call, struct blob_attr *expr)
330 return expr_and_or(call, expr, 1);
333 static int handle_expr_or(struct json_call *call, struct blob_attr *expr)
335 return expr_and_or(call, expr, 0);
338 static int handle_expr_not(struct json_call *call, struct blob_attr *expr)
340 struct blob_attr *tb[3];
343 json_get_tuple(expr, tb, BLOBMSG_TYPE_ARRAY, 0);
347 ret = json_process_expr(call, tb[1]);
353 static int handle_expr_isdir(struct json_call *call, struct blob_attr *expr)
355 static struct blob_buf b;
356 struct blob_attr *tb[3];
357 const char *pattern, *path;
361 json_get_tuple(expr, tb, BLOBMSG_TYPE_STRING, 0);
362 if (!tb[1] || blobmsg_type(tb[1]) != BLOBMSG_TYPE_STRING)
364 pattern = blobmsg_data(tb[1]);
366 blob_buf_init(&b, 0);
367 ret = eval_string(call, &b, NULL, pattern);
370 path = blobmsg_data(blob_data(b.head));
371 ret = stat(path, &s);
374 return S_ISDIR(s.st_mode);
377 static const struct json_handler expr[] = {
378 { "eq", handle_expr_eq },
379 { "regex", handle_expr_regex },
380 { "has", handle_expr_has },
381 { "and", handle_expr_and },
382 { "or", handle_expr_or },
383 { "not", handle_expr_not },
384 { "isdir", handle_expr_isdir },
388 __json_process_type(struct json_call *call, struct blob_attr *cur,
389 const struct json_handler *h, int n, bool *found)
391 const char *name = blobmsg_data(blobmsg_data(cur));
394 for (i = 0; i < n; i++) {
395 if (strcmp(name, h[i].name) != 0)
399 return h[i].cb(call, cur);
406 static int json_process_expr(struct json_call *call, struct blob_attr *cur)
408 struct json_script_ctx *ctx = call->ctx;
412 if (blobmsg_type(cur) != BLOBMSG_TYPE_ARRAY ||
413 blobmsg_type(blobmsg_data(cur)) != BLOBMSG_TYPE_STRING) {
414 ctx->handle_error(ctx, "Unexpected element type", cur);
418 ret = __json_process_type(call, cur, expr, ARRAY_SIZE(expr), &found);
420 const char *name = blobmsg_data(blobmsg_data(cur));
421 ctx->handle_expr(ctx, name, cur, call->vars);
427 static int eval_string(struct json_call *call, struct blob_buf *buf, const char *name, const char *pattern)
429 char *dest, *next, *str;
434 dest = blobmsg_alloc_string_buffer(buf, name, 1);
438 next = alloca(strlen(pattern) + 1);
439 strcpy(next, pattern);
441 for (str = next; str; str = next) {
447 end = strchr(str, '%');
453 end = str + strlen(str);
459 cur = msg_find_var(call, str);
463 cur_len = strlen(cur);
476 new_buf = blobmsg_realloc_string_buffer(buf, len + cur_len + 1);
478 /* Make eval_string return -1 */
484 memcpy(dest + len, cur, cur_len);
489 blobmsg_add_string_buffer(buf);
497 static int cmd_add_string(struct json_call *call, const char *pattern)
499 return eval_string(call, &call->ctx->buf, NULL, pattern);
502 int json_script_eval_string(struct json_script_ctx *ctx, struct blob_attr *vars,
503 struct blob_buf *buf, const char *name,
506 struct json_call call = {
511 return eval_string(&call, buf, name, pattern);
514 static int cmd_process_strings(struct json_call *call, struct blob_attr *attr)
516 struct json_script_ctx *ctx = call->ctx;
517 struct blob_attr *cur;
523 blob_buf_init(&ctx->buf, 0);
524 c = blobmsg_open_array(&ctx->buf, NULL);
525 blobmsg_for_each_attr(cur, attr, rem) {
529 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING) {
530 blobmsg_add_blob(&ctx->buf, cur);
534 ret = cmd_add_string(call, blobmsg_data(cur));
536 ctx->handle_error(ctx, "Unterminated variable reference in string", attr);
541 blobmsg_close_array(&ctx->buf, c);
546 static int __json_process_cmd(struct json_call *call, struct blob_attr *cur)
548 struct json_script_ctx *ctx = call->ctx;
553 if (blobmsg_type(cur) != BLOBMSG_TYPE_ARRAY ||
554 blobmsg_type(blobmsg_data(cur)) != BLOBMSG_TYPE_STRING) {
555 ctx->handle_error(ctx, "Unexpected element type", cur);
559 ret = __json_process_type(call, cur, cmd, ARRAY_SIZE(cmd), &found);
563 name = blobmsg_data(blobmsg_data(cur));
564 ret = cmd_process_strings(call, cur);
568 ctx->handle_command(ctx, name, blob_data(ctx->buf.head), call->vars);
573 static int json_process_cmd(struct json_call *call, struct blob_attr *block)
575 struct json_script_ctx *ctx = call->ctx;
576 struct blob_attr *cur;
581 if (blobmsg_type(block) != BLOBMSG_TYPE_ARRAY) {
582 ctx->handle_error(ctx, "Unexpected element type", block);
586 blobmsg_for_each_attr(cur, block, rem) {
590 switch(blobmsg_type(cur)) {
591 case BLOBMSG_TYPE_STRING:
593 return __json_process_cmd(call, block);
596 ret = json_process_cmd(call, cur);
607 void json_script_run_file(struct json_script_ctx *ctx, struct json_script_file *file,
608 struct blob_attr *vars)
610 static unsigned int _seq = 0;
611 struct json_call call = {
623 __json_script_run(&call, file, NULL);
626 void json_script_run(struct json_script_ctx *ctx, const char *name,
627 struct blob_attr *vars)
629 struct json_script_file *file;
631 file = json_script_get_file(ctx, name);
635 json_script_run_file(ctx, file, vars);
638 static void __json_script_file_free(struct json_script_file *f)
640 struct json_script_file *next;
648 __json_script_file_free(next);
652 json_script_free(struct json_script_ctx *ctx)
654 struct json_script_file *f, *next;
656 avl_remove_all_elements(&ctx->files, f, avl, next)
657 __json_script_file_free(f);
659 blob_buf_free(&ctx->buf);
663 __default_handle_error(struct json_script_ctx *ctx, const char *msg,
664 struct blob_attr *context)
669 __default_handle_var(struct json_script_ctx *ctx, const char *name,
670 struct blob_attr *vars)
676 __default_handle_expr(struct json_script_ctx *ctx, const char *name,
677 struct blob_attr *expr, struct blob_attr *vars)
679 ctx->handle_error(ctx, "Unknown expression type", expr);
683 static struct json_script_file *
684 __default_handle_file(struct json_script_ctx *ctx, const char *name)
689 void json_script_init(struct json_script_ctx *ctx)
691 avl_init(&ctx->files, avl_strcmp, false, NULL);
693 if (!ctx->handle_error)
694 ctx->handle_error = __default_handle_error;
696 if (!ctx->handle_var)
697 ctx->handle_var = __default_handle_var;
699 if (!ctx->handle_expr)
700 ctx->handle_expr = __default_handle_expr;
702 if (!ctx->handle_file)
703 ctx->handle_file = __default_handle_file;