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/*
* blobmsg - library for generating/parsing structured blob messages
*
* Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#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_STRING] = BLOB_ATTR_STRING,
};
bool blobmsg_check_attr(const struct blob_attr *attr, bool name)
{
const struct blobmsg_hdr *hdr;
const char *data;
int id, len;
if (blob_len(attr) < sizeof(struct blobmsg_hdr))
return false;
hdr = (void *) attr->data;
if (!hdr->namelen && name)
return false;
if (hdr->namelen > blob_len(attr) - sizeof(struct blobmsg_hdr))
return false;
if (hdr->name[hdr->namelen] != 0)
return false;
id = blob_id(attr);
len = blobmsg_data_len(attr);
data = blobmsg_data(attr);
if (!id || id > BLOBMSG_TYPE_LAST)
return false;
if (!blob_type[id])
return true;
return blob_check_type(data, len, blob_type[id]);
}
int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
struct blob_attr **tb, void *data, int len)
{
struct blobmsg_hdr *hdr;
struct blob_attr *attr;
uint8_t *pslen;
int i;
memset(tb, 0, policy_len * sizeof(*tb));
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) {
hdr = blob_data(attr);
for (i = 0; i < policy_len; i++) {
if (!policy[i].name)
continue;
if (policy[i].type != BLOBMSG_TYPE_UNSPEC &&
blob_id(attr) != policy[i].type)
continue;
if (hdr->namelen != pslen[i])
continue;
if (!blobmsg_check_attr(attr, true))
return -1;
if (tb[i])
return -1;
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;
if (!name)
name = "";
namelen = strlen(name);
attrlen = blobmsg_hdrlen(namelen) + payload_len;
attr = blob_new(buf, type, attrlen);
if (!attr)
return NULL;
hdr = blob_data(attr);
hdr->namelen = namelen;
strcpy((char *) hdr->name, (const char *)name);
*data = blobmsg_data(attr);
return attr;
}
static inline int
attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
{
return (char *)attr - (char *) buf->buf;
}
void *
blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array)
{
struct blob_attr *head = buf->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);
blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blobmsg_hdrlen(strlen(name)));
buf->head = head;
return (void *)offset;
}
void *
blobmsg_alloc_string_buffer(struct blob_buf *buf, const char *name, int maxlen)
{
struct blob_attr *attr;
void *data_dest;
attr = blobmsg_new(buf, BLOBMSG_TYPE_STRING, name, maxlen, &data_dest);
if (!attr)
return NULL;
data_dest = blobmsg_data(attr);
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_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_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, int len)
{
struct blob_attr *attr;
void *data_dest;
if (type == BLOBMSG_TYPE_ARRAY ||
type == BLOBMSG_TYPE_TABLE)
return -1;
attr = blobmsg_new(buf, type, name, len, &data_dest);
if (!attr)
return -1;
if (len > 0)
memcpy(data_dest, data, len);
return 0;
}
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