309 lines
6.8 KiB
C
309 lines
6.8 KiB
C
/*
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* Copyright (C) 2010-2012 Felix Fietkau <nbd@openwrt.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "blobmsg.h"
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static const int blob_type[__BLOBMSG_TYPE_LAST] = {
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[BLOBMSG_TYPE_INT8] = BLOB_ATTR_INT8,
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[BLOBMSG_TYPE_INT16] = BLOB_ATTR_INT16,
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[BLOBMSG_TYPE_INT32] = BLOB_ATTR_INT32,
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[BLOBMSG_TYPE_INT64] = BLOB_ATTR_INT64,
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[BLOBMSG_TYPE_STRING] = BLOB_ATTR_STRING,
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[BLOBMSG_TYPE_UNSPEC] = BLOB_ATTR_BINARY,
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};
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static uint16_t
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blobmsg_namelen(const struct blobmsg_hdr *hdr)
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{
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return be16_to_cpu(hdr->namelen);
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}
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bool blobmsg_check_attr(const struct blob_attr *attr, bool name)
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{
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const struct blobmsg_hdr *hdr;
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const char *data;
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int id, len;
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if (blob_len(attr) < sizeof(struct blobmsg_hdr))
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return false;
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hdr = (void *) attr->data;
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if (!hdr->namelen && name)
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return false;
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if (blobmsg_namelen(hdr) > blob_len(attr) - sizeof(struct blobmsg_hdr))
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return false;
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if (hdr->name[blobmsg_namelen(hdr)] != 0)
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return false;
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id = blob_id(attr);
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len = blobmsg_data_len(attr);
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data = blobmsg_data(attr);
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if (id > BLOBMSG_TYPE_LAST)
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return false;
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if (!blob_type[id])
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return true;
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return blob_check_type(data, len, blob_type[id]);
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}
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bool blobmsg_check_attr_list(const struct blob_attr *attr, int type)
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{
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struct blob_attr *cur;
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bool name;
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int rem;
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switch (blobmsg_type(attr)) {
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case BLOBMSG_TYPE_TABLE:
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name = true;
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break;
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case BLOBMSG_TYPE_ARRAY:
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name = false;
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break;
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default:
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return false;
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}
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blobmsg_for_each_attr(cur, attr, rem) {
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if (blobmsg_type(cur) != type)
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return false;
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if (!blobmsg_check_attr(cur, name))
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return false;
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}
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return true;
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}
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int blobmsg_parse_array(const struct blobmsg_policy *policy, int policy_len,
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struct blob_attr **tb, void *data, int len)
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{
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struct blob_attr *attr;
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int i = 0;
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memset(tb, 0, policy_len * sizeof(*tb));
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__blob_for_each_attr(attr, data, len) {
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if (policy[i].type != BLOBMSG_TYPE_UNSPEC &&
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blob_id(attr) != policy[i].type)
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continue;
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if (!blobmsg_check_attr(attr, false))
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return -1;
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if (tb[i])
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continue;
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tb[i++] = attr;
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if (i == policy_len)
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break;
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}
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return 0;
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}
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int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
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struct blob_attr **tb, void *data, int len)
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{
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struct blobmsg_hdr *hdr;
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struct blob_attr *attr;
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uint8_t *pslen;
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int i;
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memset(tb, 0, policy_len * sizeof(*tb));
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pslen = alloca(policy_len);
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for (i = 0; i < policy_len; i++) {
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if (!policy[i].name)
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continue;
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pslen[i] = strlen(policy[i].name);
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}
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__blob_for_each_attr(attr, data, len) {
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hdr = blob_data(attr);
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for (i = 0; i < policy_len; i++) {
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if (!policy[i].name)
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continue;
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if (policy[i].type != BLOBMSG_TYPE_UNSPEC &&
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blob_id(attr) != policy[i].type)
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continue;
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if (blobmsg_namelen(hdr) != pslen[i])
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continue;
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if (!blobmsg_check_attr(attr, true))
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return -1;
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if (tb[i])
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continue;
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if (strcmp(policy[i].name, (char *) hdr->name) != 0)
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continue;
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tb[i] = attr;
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}
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}
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return 0;
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}
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static struct blob_attr *
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blobmsg_new(struct blob_buf *buf, int type, const char *name, int payload_len, void **data)
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{
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struct blob_attr *attr;
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struct blobmsg_hdr *hdr;
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int attrlen, namelen;
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char *pad_start, *pad_end;
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if (!name)
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name = "";
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namelen = strlen(name);
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attrlen = blobmsg_hdrlen(namelen) + payload_len;
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attr = blob_new(buf, type, attrlen);
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if (!attr)
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return NULL;
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hdr = blob_data(attr);
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hdr->namelen = cpu_to_be16(namelen);
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strcpy((char *) hdr->name, (const char *)name);
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pad_end = *data = blobmsg_data(attr);
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pad_start = (char *) &hdr->name[namelen];
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if (pad_start < pad_end)
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memset(pad_start, 0, pad_end - pad_start);
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return attr;
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}
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static inline int
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attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
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{
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return (char *)attr - (char *) buf->buf + BLOB_COOKIE;
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}
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void *
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blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array)
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{
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struct blob_attr *head = buf->head;
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int type = array ? BLOBMSG_TYPE_ARRAY : BLOBMSG_TYPE_TABLE;
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unsigned long offset = attr_to_offset(buf, buf->head);
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void *data;
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if (!name)
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name = "";
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head = blobmsg_new(buf, type, name, 0, &data);
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blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blobmsg_hdrlen(strlen(name)));
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buf->head = head;
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return (void *)offset;
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}
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void
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blobmsg_vprintf(struct blob_buf *buf, const char *name, const char *format, va_list arg)
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{
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va_list arg2;
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char cbuf;
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int len;
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va_copy(arg2, arg);
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len = vsnprintf(&cbuf, sizeof(cbuf), format, arg2);
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va_end(arg2);
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vsprintf(blobmsg_alloc_string_buffer(buf, name, len + 1), format, arg);
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blobmsg_add_string_buffer(buf);
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}
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void
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blobmsg_printf(struct blob_buf *buf, const char *name, const char *format, ...)
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{
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va_list ap;
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va_start(ap, format);
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blobmsg_vprintf(buf, name, format, ap);
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va_end(ap);
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}
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void *
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blobmsg_alloc_string_buffer(struct blob_buf *buf, const char *name, int maxlen)
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{
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struct blob_attr *attr;
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void *data_dest;
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attr = blobmsg_new(buf, BLOBMSG_TYPE_STRING, name, maxlen, &data_dest);
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if (!attr)
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return NULL;
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data_dest = blobmsg_data(attr);
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blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blob_pad_len(attr));
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blob_set_raw_len(attr, blob_raw_len(attr) - maxlen);
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return data_dest;
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}
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void *
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blobmsg_realloc_string_buffer(struct blob_buf *buf, int maxlen)
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{
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struct blob_attr *attr = blob_next(buf->head);
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int offset = attr_to_offset(buf, blob_next(buf->head)) + blob_pad_len(attr) - BLOB_COOKIE;
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int required = maxlen - (buf->buflen - offset);
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if (required <= 0)
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goto out;
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blob_buf_grow(buf, required);
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attr = blob_next(buf->head);
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out:
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return blobmsg_data(attr);
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}
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void
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blobmsg_add_string_buffer(struct blob_buf *buf)
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{
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struct blob_attr *attr;
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int len, attrlen;
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attr = blob_next(buf->head);
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len = strlen(blobmsg_data(attr)) + 1;
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attrlen = blob_raw_len(attr) + len;
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blob_set_raw_len(attr, attrlen);
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blob_fill_pad(attr);
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blob_set_raw_len(buf->head, blob_raw_len(buf->head) + blob_pad_len(attr));
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}
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int
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blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
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const void *data, int len)
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{
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struct blob_attr *attr;
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void *data_dest;
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attr = blobmsg_new(buf, type, name, len, &data_dest);
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if (!attr)
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return -1;
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if (len > 0)
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memcpy(data_dest, data, len);
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return 0;
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}
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