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/*
* (C) 2013 by Álvaro Neira Ayuso <alvaroneay@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <internal.h>
#include <stdlib.h>
#include <limits.h>
#include <stdint.h>
#include <stdbool.h>
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
#include "expr_ops.h"
#include <libnftables/expr.h>
#include <linux/netfilter/nf_tables.h>
#ifdef JSON_PARSING
static int nft_jansson_load_int_node(json_t *root, const char *tag,
json_int_t *val)
{
json_t *node;
node = json_object_get(root, tag);
if (node == NULL) {
errno = EINVAL;
return -1;
}
if (!json_is_integer(node)) {
errno = ERANGE;
return -1;
}
*val = json_integer_value(node);
return 0;
}
const char *nft_jansson_value_parse_str(json_t *root, const char *tag)
{
json_t *node;
const char *val;
node = json_object_get(root, tag);
if (node == NULL) {
errno = EINVAL;
return NULL;
}
val = json_string_value(node);
return val;
}
int nft_jansson_value_parse_val(json_t *root, const char *tag, int type,
void *out)
{
json_int_t val;
if (nft_jansson_load_int_node(root, tag, &val) == -1)
return -1;
if (nft_get_value(type, &val, out) == -1)
return -1;
return 0;
}
bool nft_jansson_node_exist(json_t *root, const char *tag)
{
return json_object_get(root, tag) != NULL;
}
json_t *nft_jansson_create_root(char *json, json_error_t *err)
{
json_t *root;
root = json_loadb(json, strlen(json), 0, err);
if (root == NULL) {
errno = EINVAL;
return NULL;
}
return root;
}
json_t *nft_jansson_get_node(json_t *root, const char *tag)
{
json_t *node;
node = json_object_get(root, tag);
if (node == NULL) {
errno = EINVAL;
return NULL;
}
return node;
}
void nft_jansson_free_root(json_t *root)
{
json_decref(root);
}
int nft_jansson_parse_family(json_t *root, void *out)
{
const char *str;
int family;
str = nft_jansson_value_parse_str(root, "family");
if (str == NULL)
return -1;
family = nft_str2family(str);
if (family < 0) {
errno = EINVAL;
return -1;
}
memcpy(out, &family, sizeof(family));
return 0;
}
int nft_jansson_value_parse_reg(json_t *root, const char *tag, int type,
void *out)
{
if (nft_jansson_value_parse_val(root, tag, type, out) != 0)
return -1;
if (*((uint32_t *)out) > NFT_REG_MAX){
errno = ERANGE;
return -1;
}
return 0;
}
int nft_jansson_str2num(json_t *root, const char *tag, int base,
void *out, enum nft_type type)
{
const char *str;
str = nft_jansson_value_parse_str(root, tag);
if (str == NULL)
return -1;
return nft_strtoi(str, base, out, type);
}
struct nft_rule_expr *nft_jansson_expr_parse(json_t *root)
{
struct nft_rule_expr *e;
const char *type;
int ret;
type = nft_jansson_value_parse_str(root, "type");
if (type == NULL)
return NULL;
e = nft_rule_expr_alloc(type);
if (e == NULL)
return NULL;;
ret = e->ops->json_parse(e, root);
return ret < 0 ? NULL : e;
}
int nft_jansson_data_reg_parse(json_t *root, const char *tag,
union nft_data_reg *data_reg)
{
json_t *data;
const char *type;
int ret;
data = json_object_get(root, tag);
if (data == NULL) {
errno = EINVAL;
return -1;
}
data = json_object_get(data, "data_reg");
if (data == NULL) {
errno = EINVAL;
return -1;
}
ret = nft_data_reg_json_parse(data_reg, data);
if (ret < 0) {
errno = EINVAL;
return -1;
}
type = nft_jansson_value_parse_str(data, "type");
if (type == NULL)
return -1;
if (strcmp(type, "value") == 0)
return DATA_VALUE;
else if (strcmp(type, "verdict") == 0)
return DATA_VERDICT;
else if (strcmp(type, "chain") == 0)
return DATA_CHAIN;
else {
errno = EINVAL;
return -1;
}
}
#endif
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