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 cmd_add_string(struct json_call
*call
, const char *pattern
)
393 struct json_script_ctx
*ctx
= call
->ctx
;
394 char *dest
, *next
, *str
;
399 dest
= blobmsg_alloc_string_buffer(&ctx
->buf
, NULL
, 1);
400 next
= alloca(strlen(pattern
) + 1);
401 strcpy(next
, pattern
);
403 for (str
= next
; str
; str
= next
) {
409 end
= strchr(str
, '%');
415 end
= str
+ strlen(str
);
421 cur
= msg_find_var(call
, str
);
425 cur_len
= strlen(cur
);
438 dest
= blobmsg_realloc_string_buffer(&ctx
->buf
, cur_len
+ 1);
439 memcpy(dest
+ len
, cur
, cur_len
);
447 blobmsg_add_string_buffer(&ctx
->buf
);
451 static int cmd_process_strings(struct json_call
*call
, struct blob_attr
*attr
)
453 struct json_script_ctx
*ctx
= call
->ctx
;
454 struct blob_attr
*cur
;
459 blob_buf_init(&ctx
->buf
, 0);
460 c
= blobmsg_open_array(&ctx
->buf
, NULL
);
461 blobmsg_for_each_attr(cur
, attr
, rem
) {
465 if (blobmsg_type(cur
) != BLOBMSG_TYPE_STRING
) {
466 ctx
->handle_error(ctx
, "Invalid argument in command", attr
);
470 ret
= cmd_add_string(call
, blobmsg_data(cur
));
472 ctx
->handle_error(ctx
, "Unterminated variable reference in string", attr
);
477 blobmsg_close_array(&ctx
->buf
, c
);
482 static int __json_process_cmd(struct json_call
*call
, struct blob_attr
*cur
)
484 struct json_script_ctx
*ctx
= call
->ctx
;
489 if (blobmsg_type(cur
) != BLOBMSG_TYPE_ARRAY
||
490 blobmsg_type(blobmsg_data(cur
)) != BLOBMSG_TYPE_STRING
) {
491 ctx
->handle_error(ctx
, "Unexpected element type", cur
);
495 ret
= __json_process_type(call
, cur
, cmd
, ARRAY_SIZE(cmd
), &found
);
499 name
= blobmsg_data(blobmsg_data(cur
));
500 ret
= cmd_process_strings(call
, cur
);
504 ctx
->handle_command(ctx
, name
, blob_data(ctx
->buf
.head
), call
->vars
);
509 static int json_process_cmd(struct json_call
*call
, struct blob_attr
*block
)
511 struct json_script_ctx
*ctx
= call
->ctx
;
512 struct blob_attr
*cur
;
517 if (blobmsg_type(block
) != BLOBMSG_TYPE_ARRAY
) {
518 ctx
->handle_error(ctx
, "Unexpected element type", block
);
522 blobmsg_for_each_attr(cur
, block
, rem
) {
523 switch(blobmsg_type(cur
)) {
524 case BLOBMSG_TYPE_STRING
:
526 return __json_process_cmd(call
, block
);
528 ret
= json_process_cmd(call
, cur
);
539 void json_script_run(struct json_script_ctx
*ctx
, const char *name
,
540 struct blob_attr
*vars
)
542 struct json_script_file
*file
;
543 static unsigned int _seq
= 0;
544 struct json_call call
= {
554 file
= json_script_get_file(ctx
, name
);
558 __json_script_run(&call
, file
, NULL
);
561 static void __json_script_file_free(struct json_script_ctx
*ctx
, struct json_script_file
*f
)
563 struct json_script_file
*next
;
565 for (next
= f
->next
; f
; f
= next
, next
= f
->next
)
570 json_script_free(struct json_script_ctx
*ctx
)
572 struct json_script_file
*f
, *next
;
574 avl_remove_all_elements(&ctx
->files
, f
, avl
, next
)
575 __json_script_file_free(ctx
, f
);
577 blob_buf_free(&ctx
->buf
);
581 __default_handle_error(struct json_script_ctx
*ctx
, const char *msg
,
582 struct blob_attr
*context
)
587 __default_handle_var(struct json_script_ctx
*ctx
, const char *name
,
588 struct blob_attr
*vars
)
594 __default_handle_expr(struct json_script_ctx
*ctx
, const char *name
,
595 struct blob_attr
*expr
, struct blob_attr
*vars
)
600 static struct json_script_file
*
601 __default_handle_file(struct json_script_ctx
*ctx
, const char *name
)
606 void json_script_init(struct json_script_ctx
*ctx
)
608 avl_init(&ctx
->files
, avl_strcmp
, false, NULL
);
610 if (!ctx
->handle_error
)
611 ctx
->handle_error
= __default_handle_error
;
613 if (!ctx
->handle_var
)
614 ctx
->handle_var
= __default_handle_var
;
616 if (!ctx
->handle_expr
)
617 ctx
->handle_expr
= __default_handle_expr
;
619 if (!ctx
->handle_file
)
620 ctx
->handle_file
= __default_handle_file
;