Mirror of the official OpenWrt libubox repository https://git.openwrt.org/project/libubox
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/*
* Copyright (C) 2010-2012 Felix Fietkau <nbd@openwrt.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "blobmsg.h"
static const int blob_type[__BLOBMSG_TYPE_LAST] = {
[BLOBMSG_TYPE_INT8] = BLOB_ATTR_INT8,
[BLOBMSG_TYPE_INT16] = BLOB_ATTR_INT16,
[BLOBMSG_TYPE_INT32] = BLOB_ATTR_INT32,
[BLOBMSG_TYPE_INT64] = BLOB_ATTR_INT64,
[BLOBMSG_TYPE_DOUBLE] = BLOB_ATTR_DOUBLE,
[BLOBMSG_TYPE_STRING] = BLOB_ATTR_STRING,
[BLOBMSG_TYPE_UNSPEC] = BLOB_ATTR_BINARY,
};
bool blobmsg_check_attr(const struct blob_attr *attr, bool name)
{
return blobmsg_check_attr_len(attr, name, blob_raw_len(attr));
}
static bool blobmsg_check_name(const struct blob_attr *attr, bool name)
{
const struct blobmsg_hdr *hdr;
uint16_t namelen;
if (!blob_is_extended(attr))
return !name;
if (blob_len(attr) < sizeof(struct blobmsg_hdr))
return false;
hdr = (const struct blobmsg_hdr *)blob_data(attr);
if (name && !hdr->namelen)
return false;
namelen = blobmsg_namelen(hdr);
if (blob_len(attr) < (size_t)blobmsg_hdrlen(namelen))
return false;
if (hdr->name[namelen] != 0)
return false;
return true;
}
bool blobmsg_check_attr_len(const struct blob_attr *attr, bool name, size_t len)
{
const char *data;
size_t data_len;
int id;
if (len < sizeof(struct blob_attr))
return false;
data_len = blob_raw_len(attr);
if (data_len < sizeof(struct blob_attr) || data_len > len)
return false;
if (!blobmsg_check_name(attr, name))
return false;
id = blob_id(attr);
if (id > BLOBMSG_TYPE_LAST)
return false;
if (!blob_type[id])
return true;
data = blobmsg_data(attr);
data_len = blobmsg_data_len(attr);
return blob_check_type(data, data_len, blob_type[id]);
}
int blobmsg_check_array(const struct blob_attr *attr, int type)
{
return blobmsg_check_array_len(attr, type, blob_raw_len(attr));
}
int blobmsg_check_array_len(const struct blob_attr *attr, int type,
size_t blob_len)
{
struct blob_attr *cur;
size_t rem;
bool name;
int size = 0;
if (type > BLOBMSG_TYPE_LAST)
return -1;
if (!blobmsg_check_attr_len(attr, false, blob_len))
return -1;
switch (blobmsg_type(attr)) {
case BLOBMSG_TYPE_TABLE:
name = true;
break;
case BLOBMSG_TYPE_ARRAY:
name = false;
break;
default:
return -1;
}
blobmsg_for_each_attr(cur, attr, rem) {
if (type != BLOBMSG_TYPE_UNSPEC && blobmsg_type(cur) != type)
return -1;
if (!blobmsg_check_attr_len(cur, name, rem))
return -1;
size++;
}
return size;
}
bool blobmsg_check_attr_list(const struct blob_attr *attr, int type)
{
return blobmsg_check_array(attr, type) >= 0;
}
bool blobmsg_check_attr_list_len(const struct blob_attr *attr, int type, size_t len)
{
return blobmsg_check_array_len(attr, type, len) >= 0;
}
int blobmsg_parse_array(const struct blobmsg_policy *policy, int policy_len,
struct blob_attr **tb, void *data, unsigned int len)
{
struct blob_attr *attr;
int i = 0;
memset(tb, 0, policy_len * sizeof(*tb));
__blob_for_each_attr(attr, data, len) {
if (policy[i].type != BLOBMSG_TYPE_UNSPEC &&
blob_id(attr) != policy[i].type)
continue;
if (!blobmsg_check_attr_len(attr, false, len))
return -1;
if (tb[i])
continue;
tb[i++] = attr;
if (i == policy_len)
break;
}
return 0;
}
int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
struct blob_attr **tb, void *data, unsigned int len)
{
const struct blobmsg_hdr *hdr;
struct blob_attr *attr;
uint8_t *pslen;
int i;
memset(tb, 0, policy_len * sizeof(*tb));
if (!data || !len)
return -EINVAL;
pslen = alloca(policy_len);
for (i = 0; i < policy_len; i++) {
if (!policy[i].name)
continue;
pslen[i] = strlen(policy[i].name);
}
__blob_for_each_attr(attr, data, len) {
if (!blobmsg_check_attr_len(attr, false, len))
return -1;
if (!blob_is_extended(attr))
continue;
hdr = blob_data(attr);
for (i = 0; i < policy_len; i++) {
if (!policy[i].name)
continue;
if (policy[i].type != BLOBMSG_TYPE_UNSPEC &&
policy[i].type != BLOBMSG_CAST_INT64 &&
blob_id(attr) != policy[i].type)
continue;
if (policy[i].type == BLOBMSG_CAST_INT64 &&
(blob_id(attr) != BLOBMSG_TYPE_INT64 &&
blob_id(attr) != BLOBMSG_TYPE_INT32 &&
blob_id(attr) != BLOBMSG_TYPE_INT16 &&
blob_id(attr) != BLOBMSG_TYPE_INT8))
continue;
if (blobmsg_namelen(hdr) != pslen[i])
continue;
if (tb[i])
continue;
if (strcmp(policy[i].name, (char *) hdr->name) != 0)
continue;
tb[i] = attr;
}
}
return 0;
}
static struct blob_attr *
blobmsg_new(struct blob_buf *buf, int type, const char *name, int payload_len, void **data)
{
struct blob_attr *attr;
struct blobmsg_hdr *hdr;
int attrlen, namelen;
char *pad_start, *pad_end;
if (!name)
name = "";
namelen = strlen(name);
attrlen = blobmsg_hdrlen(namelen) + payload_len;
attr = blob_new(buf, type, attrlen);
if (!attr)
return NULL;
attr->id_len |= be32_to_cpu(BLOB_ATTR_EXTENDED);
hdr = blob_data(attr);
hdr->namelen = cpu_to_be16(namelen);
memcpy(hdr->name, name, namelen);
hdr->name[namelen] = '\0';
pad_end = *data = blobmsg_data(attr);
pad_start = (char *) &hdr->name[namelen];
if (pad_start < pad_end)
memset(pad_start, 0, pad_end - pad_start);
return attr;
}
static inline int
attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
{
return (char *)attr - (char *) buf->buf + BLOB_COOKIE;
}
void *
blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array)
{
struct blob_attr *head;
int type = array ? BLOBMSG_TYPE_ARRAY : BLOBMSG_TYPE_TABLE;
unsigned long offset = attr_to_offset(buf, buf->head);
void *data;
if (!name)
name = "";
head = blobmsg_new(buf, type, name, 0, &data);
if (!head)
return NULL;
blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blobmsg_hdrlen(strlen(name)));
buf->head = head;
return (void *)offset;
}
__attribute__((format(printf, 3, 0)))
int blobmsg_vprintf(struct blob_buf *buf, const char *name, const char *format, va_list arg)
{
va_list arg2;
char cbuf;
char *sbuf;
int len, ret;
va_copy(arg2, arg);
len = vsnprintf(&cbuf, sizeof(cbuf), format, arg2);
va_end(arg2);
if (len < 0)
return -1;
sbuf = blobmsg_alloc_string_buffer(buf, name, len + 1);
if (!sbuf)
return -1;
ret = vsnprintf(sbuf, len + 1, format, arg);
if (ret < 0)
return -1;
blobmsg_add_string_buffer(buf);
return ret;
}
__attribute__((format(printf, 3, 4)))
int blobmsg_printf(struct blob_buf *buf, const char *name, const char *format, ...)
{
va_list ap;
int ret;
va_start(ap, format);
ret = blobmsg_vprintf(buf, name, format, ap);
va_end(ap);
return ret;
}
void *
blobmsg_alloc_string_buffer(struct blob_buf *buf, const char *name, unsigned int maxlen)
{
struct blob_attr *attr;
void *data_dest;
attr = blobmsg_new(buf, BLOBMSG_TYPE_STRING, name, maxlen, &data_dest);
if (!attr)
return NULL;
blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blob_pad_len(attr));
blob_set_raw_len(attr, blob_raw_len(attr) - maxlen);
return data_dest;
}
void *
blobmsg_realloc_string_buffer(struct blob_buf *buf, unsigned int maxlen)
{
struct blob_attr *attr = blob_next(buf->head);
int offset = attr_to_offset(buf, blob_next(buf->head)) + blob_pad_len(attr) - BLOB_COOKIE;
int required = maxlen - (buf->buflen - offset);
if (required <= 0)
goto out;
if (!blob_buf_grow(buf, required))
return NULL;
attr = blob_next(buf->head);
out:
return blobmsg_data(attr);
}
void
blobmsg_add_string_buffer(struct blob_buf *buf)
{
struct blob_attr *attr;
int len, attrlen;
attr = blob_next(buf->head);
len = strlen(blobmsg_data(attr)) + 1;
attrlen = blob_raw_len(attr) + len;
blob_set_raw_len(attr, attrlen);
blob_fill_pad(attr);
blob_set_raw_len(buf->head, blob_raw_len(buf->head) + blob_pad_len(attr));
}
int
blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
const void *data, unsigned int len)
{
struct blob_attr *attr;
void *data_dest;
attr = blobmsg_new(buf, type, name, len, &data_dest);
if (!attr)
return -1;
if (len > 0)
memcpy(data_dest, data, len);
return 0;
}