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
);
36 struct json_script_file
*
37 json_script_file_from_blobmsg(const char *name
, void *data
, int len
)
39 struct json_script_file
*f
;
44 name_len
= strlen(name
) + 1;
46 f
= calloc_a(sizeof(*f
) + len
, &new_name
, name_len
);
47 memcpy(f
->data
, data
, len
);
49 f
->avl
.key
= strcpy(new_name
, name
);
54 static struct json_script_file
*
55 json_script_get_file(struct json_script_ctx
*ctx
, const char *filename
)
57 struct json_script_file
*f
;
59 f
= avl_find_element(&ctx
->files
, filename
, f
, avl
);
63 f
= ctx
->handle_file(ctx
, filename
);
67 avl_insert(&ctx
->files
, &f
->avl
);
71 static void __json_script_run(struct json_call
*call
, struct json_script_file
*file
,
72 struct blob_attr
*context
)
74 struct json_script_ctx
*ctx
= call
->ctx
;
76 if (file
->seq
== call
->seq
) {
78 ctx
->handle_error(ctx
, "Recursive include", context
);
83 file
->seq
= call
->seq
;
85 json_process_cmd(call
, file
->data
);
90 const char *json_script_find_var(struct json_script_ctx
*ctx
, struct blob_attr
*vars
,
93 struct blob_attr
*cur
;
96 blobmsg_for_each_attr(cur
, vars
, rem
) {
97 if (blobmsg_type(cur
) != BLOBMSG_TYPE_STRING
)
100 if (strcmp(blobmsg_name(cur
), name
) != 0)
103 return blobmsg_data(cur
);
106 return ctx
->handle_var(ctx
, name
, vars
);
110 msg_find_var(struct json_call
*call
, const char *name
)
112 return json_script_find_var(call
->ctx
, call
->vars
, name
);
116 json_get_tuple(struct blob_attr
*cur
, struct blob_attr
**tb
, int t1
, int t2
)
118 static struct blobmsg_policy expr_tuple
[3] = {
119 { .type
= BLOBMSG_TYPE_STRING
},
124 expr_tuple
[1].type
= t1
;
125 expr_tuple
[2].type
= t2
;
126 blobmsg_parse_array(expr_tuple
, 3, tb
, blobmsg_data(cur
), blobmsg_data_len(cur
));
129 static int handle_if(struct json_call
*call
, struct blob_attr
*expr
)
131 struct blob_attr
*tb
[4];
134 static const struct blobmsg_policy if_tuple
[4] = {
135 { .type
= BLOBMSG_TYPE_STRING
},
136 { .type
= BLOBMSG_TYPE_ARRAY
},
137 { .type
= BLOBMSG_TYPE_ARRAY
},
138 { .type
= BLOBMSG_TYPE_ARRAY
},
141 blobmsg_parse_array(if_tuple
, 4, tb
, blobmsg_data(expr
), blobmsg_data_len(expr
));
143 if (!tb
[1] || !tb
[2])
146 ret
= json_process_expr(call
, tb
[1]);
151 return json_process_cmd(call
, tb
[2]);
156 return json_process_cmd(call
, tb
[3]);
159 static int handle_case(struct json_call
*call
, struct blob_attr
*expr
)
161 struct blob_attr
*tb
[3], *cur
;
165 json_get_tuple(expr
, tb
, BLOBMSG_TYPE_STRING
, BLOBMSG_TYPE_TABLE
);
166 if (!tb
[1] || !tb
[2])
169 var
= msg_find_var(call
, blobmsg_data(tb
[1]));
173 blobmsg_for_each_attr(cur
, tb
[2], rem
) {
174 if (!strcmp(var
, blobmsg_name(cur
)))
175 return json_process_cmd(call
, cur
);
181 static int handle_return(struct json_call
*call
, struct blob_attr
*expr
)
186 static int handle_include(struct json_call
*call
, struct blob_attr
*expr
)
188 struct blob_attr
*tb
[3];
189 struct json_script_file
*f
;
191 json_get_tuple(expr
, tb
, BLOBMSG_TYPE_STRING
, 0);
195 f
= json_script_get_file(call
->ctx
, blobmsg_data(tb
[1]));
199 __json_script_run(call
, f
, expr
);
203 static const struct json_handler cmd
[] = {
205 { "case", handle_case
},
206 { "return", handle_return
},
207 { "include", handle_include
},
210 static int eq_regex_cmp(const char *str
, const char *pattern
, bool regex
)
216 return !strcmp(str
, pattern
);
218 if (regcomp(®
, pattern
, REG_EXTENDED
| REG_NOSUB
))
221 ret
= !regexec(®
, str
, 0, NULL
, 0);
227 static int expr_eq_regex(struct json_call
*call
, struct blob_attr
*expr
, bool regex
)
229 struct json_script_ctx
*ctx
= call
->ctx
;
230 struct blob_attr
*tb
[3], *cur
;
234 json_get_tuple(expr
, tb
, BLOBMSG_TYPE_STRING
, 0);
235 if (!tb
[1] || !tb
[2])
238 var
= msg_find_var(call
, blobmsg_data(tb
[1]));
242 switch(blobmsg_type(tb
[2])) {
243 case BLOBMSG_TYPE_STRING
:
244 return eq_regex_cmp(var
, blobmsg_data(tb
[2]), regex
);
245 case BLOBMSG_TYPE_ARRAY
:
246 blobmsg_for_each_attr(cur
, tb
[2], rem
) {
247 if (blobmsg_type(cur
) != BLOBMSG_TYPE_STRING
) {
248 ctx
->handle_error(ctx
, "Unexpected element type", cur
);
252 if (eq_regex_cmp(var
, blobmsg_data(cur
), regex
))
257 ctx
->handle_error(ctx
, "Unexpected element type", tb
[2]);
262 static int handle_expr_eq(struct json_call
*call
, struct blob_attr
*expr
)
264 return expr_eq_regex(call
, expr
, false);
267 static int handle_expr_regex(struct json_call
*call
, struct blob_attr
*expr
)
269 return expr_eq_regex(call
, expr
, true);
272 static int handle_expr_has(struct json_call
*call
, struct blob_attr
*expr
)
274 struct json_script_ctx
*ctx
= call
->ctx
;
275 struct blob_attr
*tb
[3], *cur
;
278 json_get_tuple(expr
, tb
, 0, 0);
282 switch(blobmsg_type(tb
[1])) {
283 case BLOBMSG_TYPE_STRING
:
284 return !!msg_find_var(call
, blobmsg_data(tb
[1]));
285 case BLOBMSG_TYPE_ARRAY
:
286 blobmsg_for_each_attr(cur
, tb
[1], rem
) {
287 if (blobmsg_type(cur
) != BLOBMSG_TYPE_STRING
) {
288 ctx
->handle_error(ctx
, "Unexpected element type", cur
);
292 if (msg_find_var(call
, blobmsg_data(cur
)))
297 ctx
->handle_error(ctx
, "Unexpected element type", tb
[1]);
302 static int expr_and_or(struct json_call
*call
, struct blob_attr
*expr
, bool and)
304 struct blob_attr
*cur
;
308 blobmsg_for_each_attr(cur
, expr
, rem
) {
312 ret
= json_process_expr(call
, cur
);
323 static int handle_expr_and(struct json_call
*call
, struct blob_attr
*expr
)
325 return expr_and_or(call
, expr
, 1);
328 static int handle_expr_or(struct json_call
*call
, struct blob_attr
*expr
)
330 return expr_and_or(call
, expr
, 0);
333 static int handle_expr_not(struct json_call
*call
, struct blob_attr
*expr
)
335 struct blob_attr
*tb
[3];
337 json_get_tuple(expr
, tb
, BLOBMSG_TYPE_ARRAY
, 0);
341 return json_process_expr(call
, tb
[1]);
344 static const struct json_handler expr
[] = {
345 { "eq", handle_expr_eq
},
346 { "regex", handle_expr_regex
},
347 { "has", handle_expr_has
},
348 { "and", handle_expr_and
},
349 { "or", handle_expr_or
},
350 { "not", handle_expr_not
},
354 __json_process_type(struct json_call
*call
, struct blob_attr
*cur
,
355 const struct json_handler
*h
, int n
, bool *found
)
357 const char *name
= blobmsg_data(blobmsg_data(cur
));
360 for (i
= 0; i
< n
; i
++) {
361 if (strcmp(name
, h
[i
].name
) != 0)
365 return h
[i
].cb(call
, cur
);
372 static int json_process_expr(struct json_call
*call
, struct blob_attr
*cur
)
374 struct json_script_ctx
*ctx
= call
->ctx
;
378 if (blobmsg_type(cur
) != BLOBMSG_TYPE_ARRAY
||
379 blobmsg_type(blobmsg_data(cur
)) != BLOBMSG_TYPE_STRING
) {
380 ctx
->handle_error(ctx
, "Unexpected element type", cur
);
384 ret
= __json_process_type(call
, cur
, expr
, ARRAY_SIZE(expr
), &found
);
386 ctx
->handle_error(ctx
, "Unknown expression type", cur
);
391 static int eval_string(struct json_call
*call
, struct blob_buf
*buf
, const char *name
, const char *pattern
)
393 char *dest
, *next
, *str
;
398 dest
= blobmsg_alloc_string_buffer(buf
, name
, 1);
399 next
= alloca(strlen(pattern
) + 1);
400 strcpy(next
, pattern
);
402 for (str
= next
; str
; str
= next
) {
408 end
= strchr(str
, '%');
414 end
= str
+ strlen(str
);
420 cur
= msg_find_var(call
, str
);
424 cur_len
= strlen(cur
);
437 dest
= blobmsg_realloc_string_buffer(buf
, cur_len
+ 1);
438 memcpy(dest
+ len
, cur
, cur_len
);
443 blobmsg_add_string_buffer(buf
);
451 static int cmd_add_string(struct json_call
*call
, const char *pattern
)
453 return eval_string(call
, &call
->ctx
->buf
, NULL
, pattern
);
456 int json_script_eval_string(struct json_script_ctx
*ctx
, struct blob_attr
*vars
,
457 struct blob_buf
*buf
, const char *name
,
460 struct json_call call
= {
465 return eval_string(&call
, buf
, name
, pattern
);
468 static int cmd_process_strings(struct json_call
*call
, struct blob_attr
*attr
)
470 struct json_script_ctx
*ctx
= call
->ctx
;
471 struct blob_attr
*cur
;
476 blob_buf_init(&ctx
->buf
, 0);
477 c
= blobmsg_open_array(&ctx
->buf
, NULL
);
478 blobmsg_for_each_attr(cur
, attr
, rem
) {
482 if (blobmsg_type(cur
) != BLOBMSG_TYPE_STRING
) {
483 ctx
->handle_error(ctx
, "Invalid argument in command", attr
);
487 ret
= cmd_add_string(call
, blobmsg_data(cur
));
489 ctx
->handle_error(ctx
, "Unterminated variable reference in string", attr
);
494 blobmsg_close_array(&ctx
->buf
, c
);
499 static int __json_process_cmd(struct json_call
*call
, struct blob_attr
*cur
)
501 struct json_script_ctx
*ctx
= call
->ctx
;
506 if (blobmsg_type(cur
) != BLOBMSG_TYPE_ARRAY
||
507 blobmsg_type(blobmsg_data(cur
)) != BLOBMSG_TYPE_STRING
) {
508 ctx
->handle_error(ctx
, "Unexpected element type", cur
);
512 ret
= __json_process_type(call
, cur
, cmd
, ARRAY_SIZE(cmd
), &found
);
516 name
= blobmsg_data(blobmsg_data(cur
));
517 ret
= cmd_process_strings(call
, cur
);
521 ctx
->handle_command(ctx
, name
, blob_data(ctx
->buf
.head
), call
->vars
);
526 static int json_process_cmd(struct json_call
*call
, struct blob_attr
*block
)
528 struct json_script_ctx
*ctx
= call
->ctx
;
529 struct blob_attr
*cur
;
534 if (blobmsg_type(block
) != BLOBMSG_TYPE_ARRAY
) {
535 ctx
->handle_error(ctx
, "Unexpected element type", block
);
539 blobmsg_for_each_attr(cur
, block
, rem
) {
540 switch(blobmsg_type(cur
)) {
541 case BLOBMSG_TYPE_STRING
:
543 return __json_process_cmd(call
, block
);
545 ret
= json_process_cmd(call
, cur
);
556 void json_script_run_file(struct json_script_ctx
*ctx
, struct json_script_file
*file
,
557 struct blob_attr
*vars
)
559 static unsigned int _seq
= 0;
560 struct json_call call
= {
570 __json_script_run(&call
, file
, NULL
);
573 void json_script_run(struct json_script_ctx
*ctx
, const char *name
,
574 struct blob_attr
*vars
)
576 struct json_script_file
*file
;
578 file
= json_script_get_file(ctx
, name
);
582 json_script_run_file(ctx
, file
, vars
);
585 static void __json_script_file_free(struct json_script_file
*f
)
587 struct json_script_file
*next
;
596 return __json_script_file_free(next
);
600 json_script_free(struct json_script_ctx
*ctx
)
602 struct json_script_file
*f
, *next
;
604 avl_remove_all_elements(&ctx
->files
, f
, avl
, next
)
605 __json_script_file_free(f
);
607 blob_buf_free(&ctx
->buf
);
611 __default_handle_error(struct json_script_ctx
*ctx
, const char *msg
,
612 struct blob_attr
*context
)
617 __default_handle_var(struct json_script_ctx
*ctx
, const char *name
,
618 struct blob_attr
*vars
)
624 __default_handle_expr(struct json_script_ctx
*ctx
, const char *name
,
625 struct blob_attr
*expr
, struct blob_attr
*vars
)
630 static struct json_script_file
*
631 __default_handle_file(struct json_script_ctx
*ctx
, const char *name
)
636 void json_script_init(struct json_script_ctx
*ctx
)
638 avl_init(&ctx
->files
, avl_strcmp
, false, NULL
);
640 if (!ctx
->handle_error
)
641 ctx
->handle_error
= __default_handle_error
;
643 if (!ctx
->handle_var
)
644 ctx
->handle_var
= __default_handle_var
;
646 if (!ctx
->handle_expr
)
647 ctx
->handle_expr
= __default_handle_expr
;
649 if (!ctx
->handle_file
)
650 ctx
->handle_file
= __default_handle_file
;