2 * Copyright (C) 2010-2012 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.
18 static const int blob_type
[__BLOBMSG_TYPE_LAST
] = {
19 [BLOBMSG_TYPE_INT8
] = BLOB_ATTR_INT8
,
20 [BLOBMSG_TYPE_INT16
] = BLOB_ATTR_INT16
,
21 [BLOBMSG_TYPE_INT32
] = BLOB_ATTR_INT32
,
22 [BLOBMSG_TYPE_INT64
] = BLOB_ATTR_INT64
,
23 [BLOBMSG_TYPE_DOUBLE
] = BLOB_ATTR_DOUBLE
,
24 [BLOBMSG_TYPE_STRING
] = BLOB_ATTR_STRING
,
25 [BLOBMSG_TYPE_UNSPEC
] = BLOB_ATTR_BINARY
,
28 bool blobmsg_check_attr(const struct blob_attr
*attr
, bool name
)
30 return blobmsg_check_attr_len(attr
, name
, blob_raw_len(attr
));
33 static bool blobmsg_check_name(const struct blob_attr
*attr
, bool name
)
35 const struct blobmsg_hdr
*hdr
;
38 if (!blob_is_extended(attr
))
41 if (blob_len(attr
) < sizeof(struct blobmsg_hdr
))
44 hdr
= (const struct blobmsg_hdr
*)blob_data(attr
);
45 if (name
&& !hdr
->namelen
)
48 namelen
= blobmsg_namelen(hdr
);
49 if (blob_len(attr
) < (size_t)blobmsg_hdrlen(namelen
))
52 if (hdr
->name
[namelen
] != 0)
58 bool blobmsg_check_attr_len(const struct blob_attr
*attr
, bool name
, size_t len
)
64 if (len
< sizeof(struct blob_attr
))
67 data_len
= blob_raw_len(attr
);
68 if (data_len
< sizeof(struct blob_attr
) || data_len
> len
)
71 if (!blobmsg_check_name(attr
, name
))
75 if (id
> BLOBMSG_TYPE_LAST
)
81 data
= blobmsg_data(attr
);
82 data_len
= blobmsg_data_len(attr
);
84 return blob_check_type(data
, data_len
, blob_type
[id
]);
87 int blobmsg_check_array(const struct blob_attr
*attr
, int type
)
89 return blobmsg_check_array_len(attr
, type
, blob_raw_len(attr
));
92 int blobmsg_check_array_len(const struct blob_attr
*attr
, int type
,
95 struct blob_attr
*cur
;
100 if (type
> BLOBMSG_TYPE_LAST
)
103 if (!blobmsg_check_attr_len(attr
, false, blob_len
))
106 switch (blobmsg_type(attr
)) {
107 case BLOBMSG_TYPE_TABLE
:
110 case BLOBMSG_TYPE_ARRAY
:
117 blobmsg_for_each_attr(cur
, attr
, rem
) {
118 if (type
!= BLOBMSG_TYPE_UNSPEC
&& blobmsg_type(cur
) != type
)
121 if (!blobmsg_check_attr_len(cur
, name
, rem
))
130 bool blobmsg_check_attr_list(const struct blob_attr
*attr
, int type
)
132 return blobmsg_check_array(attr
, type
) >= 0;
135 bool blobmsg_check_attr_list_len(const struct blob_attr
*attr
, int type
, size_t len
)
137 return blobmsg_check_array_len(attr
, type
, len
) >= 0;
140 int blobmsg_parse_array(const struct blobmsg_policy
*policy
, int policy_len
,
141 struct blob_attr
**tb
, void *data
, unsigned int len
)
143 struct blob_attr
*attr
;
146 memset(tb
, 0, policy_len
* sizeof(*tb
));
147 __blob_for_each_attr(attr
, data
, len
) {
148 if (policy
[i
].type
!= BLOBMSG_TYPE_UNSPEC
&&
149 blob_id(attr
) != policy
[i
].type
)
152 if (!blobmsg_check_attr_len(attr
, false, len
))
166 int blobmsg_parse(const struct blobmsg_policy
*policy
, int policy_len
,
167 struct blob_attr
**tb
, void *data
, unsigned int len
)
169 const struct blobmsg_hdr
*hdr
;
170 struct blob_attr
*attr
;
174 memset(tb
, 0, policy_len
* sizeof(*tb
));
177 pslen
= alloca(policy_len
);
178 for (i
= 0; i
< policy_len
; i
++) {
182 pslen
[i
] = strlen(policy
[i
].name
);
185 __blob_for_each_attr(attr
, data
, len
) {
186 if (!blobmsg_check_attr_len(attr
, false, len
))
189 if (!blob_is_extended(attr
))
192 hdr
= blob_data(attr
);
193 for (i
= 0; i
< policy_len
; i
++) {
197 if (policy
[i
].type
!= BLOBMSG_TYPE_UNSPEC
&&
198 blob_id(attr
) != policy
[i
].type
)
201 if (blobmsg_namelen(hdr
) != pslen
[i
])
207 if (strcmp(policy
[i
].name
, (char *) hdr
->name
) != 0)
218 static struct blob_attr
*
219 blobmsg_new(struct blob_buf
*buf
, int type
, const char *name
, int payload_len
, void **data
)
221 struct blob_attr
*attr
;
222 struct blobmsg_hdr
*hdr
;
223 int attrlen
, namelen
;
224 char *pad_start
, *pad_end
;
229 namelen
= strlen(name
);
230 attrlen
= blobmsg_hdrlen(namelen
) + payload_len
;
231 attr
= blob_new(buf
, type
, attrlen
);
235 attr
->id_len
|= be32_to_cpu(BLOB_ATTR_EXTENDED
);
236 hdr
= blob_data(attr
);
237 hdr
->namelen
= cpu_to_be16(namelen
);
239 memcpy(hdr
->name
, name
, namelen
);
240 hdr
->name
[namelen
] = '\0';
242 pad_end
= *data
= blobmsg_data(attr
);
243 pad_start
= (char *) &hdr
->name
[namelen
];
244 if (pad_start
< pad_end
)
245 memset(pad_start
, 0, pad_end
- pad_start
);
251 attr_to_offset(struct blob_buf
*buf
, struct blob_attr
*attr
)
253 return (char *)attr
- (char *) buf
->buf
+ BLOB_COOKIE
;
258 blobmsg_open_nested(struct blob_buf
*buf
, const char *name
, bool array
)
260 struct blob_attr
*head
;
261 int type
= array
? BLOBMSG_TYPE_ARRAY
: BLOBMSG_TYPE_TABLE
;
262 unsigned long offset
= attr_to_offset(buf
, buf
->head
);
268 head
= blobmsg_new(buf
, type
, name
, 0, &data
);
271 blob_set_raw_len(buf
->head
, blob_pad_len(buf
->head
) - blobmsg_hdrlen(strlen(name
)));
273 return (void *)offset
;
276 __attribute__((format(printf
, 3, 0)))
277 int blobmsg_vprintf(struct blob_buf
*buf
, const char *name
, const char *format
, va_list arg
)
285 len
= vsnprintf(&cbuf
, sizeof(cbuf
), format
, arg2
);
291 sbuf
= blobmsg_alloc_string_buffer(buf
, name
, len
+ 1);
295 ret
= vsnprintf(sbuf
, len
+ 1, format
, arg
);
299 blobmsg_add_string_buffer(buf
);
304 __attribute__((format(printf
, 3, 4)))
305 int blobmsg_printf(struct blob_buf
*buf
, const char *name
, const char *format
, ...)
310 va_start(ap
, format
);
311 ret
= blobmsg_vprintf(buf
, name
, format
, ap
);
318 blobmsg_alloc_string_buffer(struct blob_buf
*buf
, const char *name
, unsigned int maxlen
)
320 struct blob_attr
*attr
;
323 attr
= blobmsg_new(buf
, BLOBMSG_TYPE_STRING
, name
, maxlen
, &data_dest
);
327 blob_set_raw_len(buf
->head
, blob_pad_len(buf
->head
) - blob_pad_len(attr
));
328 blob_set_raw_len(attr
, blob_raw_len(attr
) - maxlen
);
334 blobmsg_realloc_string_buffer(struct blob_buf
*buf
, unsigned int maxlen
)
336 struct blob_attr
*attr
= blob_next(buf
->head
);
337 int offset
= attr_to_offset(buf
, blob_next(buf
->head
)) + blob_pad_len(attr
) - BLOB_COOKIE
;
338 int required
= maxlen
- (buf
->buflen
- offset
);
343 if (!blob_buf_grow(buf
, required
))
345 attr
= blob_next(buf
->head
);
348 return blobmsg_data(attr
);
352 blobmsg_add_string_buffer(struct blob_buf
*buf
)
354 struct blob_attr
*attr
;
357 attr
= blob_next(buf
->head
);
358 len
= strlen(blobmsg_data(attr
)) + 1;
360 attrlen
= blob_raw_len(attr
) + len
;
361 blob_set_raw_len(attr
, attrlen
);
364 blob_set_raw_len(buf
->head
, blob_raw_len(buf
->head
) + blob_pad_len(attr
));
368 blobmsg_add_field(struct blob_buf
*buf
, int type
, const char *name
,
369 const void *data
, unsigned int len
)
371 struct blob_attr
*attr
;
374 attr
= blobmsg_new(buf
, type
, name
, len
, &data_dest
);
379 memcpy(data_dest
, data
, len
);