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/*
* (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
* (C) 2013 by Arturo Borrero Gonzalez <arturo.borrero.glez@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.
*
* This code has been sponsored by Sophos Astaro <http://www.sophos.com>
*/
#include "internal.h"
#include "expr_ops.h"
#include <stdint.h>
#include <limits.h>
#include <linux/netfilter/nf_tables.h>
#include <libnftnl/table.h>
#include <libnftnl/chain.h>
#include <libnftnl/rule.h>
#include <libnftnl/expr.h>
#include <libnftnl/set.h>
#ifdef XML_PARSING
mxml_node_t *nft_mxml_build_tree(const void *data, const char *treename,
struct nft_parse_err *err, enum nft_parse_input input)
{
mxml_node_t *tree;
switch (input) {
case NFT_PARSE_BUFFER:
tree = mxmlLoadString(NULL, data, MXML_OPAQUE_CALLBACK);
break;
case NFT_PARSE_FILE:
tree = mxmlLoadFile(NULL, (FILE *)data, MXML_OPAQUE_CALLBACK);
break;
default:
goto err;
}
if (tree == NULL) {
err->error = NFT_PARSE_EBADINPUT;
goto err;
}
if (strcmp(tree->value.opaque, treename) == 0)
return tree;
err->error = NFT_PARSE_EMISSINGNODE;
err->node_name = treename;
mxmlDelete(tree);
err:
err->line = 0;
err->column = 0;
errno = EINVAL;
return NULL;
}
struct nft_rule_expr *nft_mxml_expr_parse(mxml_node_t *node,
struct nft_parse_err *err,
struct nft_set_list *set_list)
{
mxml_node_t *tree;
struct nft_rule_expr *e;
const char *expr_name;
char *xml_text;
uint32_t set_id;
int ret;
expr_name = mxmlElementGetAttr(node, "type");
if (expr_name == NULL) {
err->node_name = "type";
err->error = NFT_PARSE_EMISSINGNODE;
goto err;
}
e = nft_rule_expr_alloc(expr_name);
if (e == NULL)
goto err;
xml_text = mxmlSaveAllocString(node, MXML_NO_CALLBACK);
if (xml_text == NULL)
goto err_expr;
tree = mxmlLoadString(NULL, xml_text, MXML_OPAQUE_CALLBACK);
xfree(xml_text);
if (tree == NULL)
goto err_expr;
ret = e->ops->xml_parse(e, tree, err);
mxmlDelete(tree);
if (set_list != NULL &&
strcmp(expr_name, "lookup") == 0 &&
nft_set_lookup_id(e, set_list, &set_id))
nft_rule_expr_set_u32(e, NFT_EXPR_LOOKUP_SET_ID, set_id);
return ret < 0 ? NULL : e;
err_expr:
nft_rule_expr_free(e);
err:
mxmlDelete(tree);
errno = EINVAL;
return NULL;
}
int nft_mxml_reg_parse(mxml_node_t *tree, const char *reg_name, uint32_t *reg,
uint32_t mxmlflags, uint32_t flags,
struct nft_parse_err *err)
{
mxml_node_t *node;
node = mxmlFindElement(tree, tree, reg_name, NULL, NULL, mxmlflags);
if (node == NULL) {
if (!(flags & NFT_XML_OPT)) {
err->error = NFT_PARSE_EMISSINGNODE;
errno = EINVAL;
goto err;
}
return -1;
}
if (nft_strtoi(node->child->value.opaque, BASE_DEC, reg,
NFT_TYPE_U32) != 0) {
err->error = NFT_PARSE_EBADTYPE;
goto err;
}
if (*reg > NFT_REG_MAX) {
errno = ERANGE;
goto err;
}
return 0;
err:
err->node_name = reg_name;
return -1;
}
int nft_mxml_data_reg_parse(mxml_node_t *tree, const char *node_name,
union nft_data_reg *data_reg, uint16_t flags,
struct nft_parse_err *err)
{
mxml_node_t *node;
node = mxmlFindElement(tree, tree, node_name, NULL, NULL,
MXML_DESCEND_FIRST);
/* It is necessary for the compatibility with cmpdata label. */
if (node == NULL || node->child == NULL)
node = tree;
return nft_data_reg_xml_parse(data_reg, node, err);
}
int
nft_mxml_num_parse(mxml_node_t *tree, const char *node_name,
uint32_t mxml_flags, int base, void *number,
enum nft_type type, uint16_t flags,
struct nft_parse_err *err)
{
mxml_node_t *node = NULL;
int ret;
node = mxmlFindElement(tree, tree, node_name, NULL, NULL, mxml_flags);
if (node == NULL || node->child == NULL) {
if (!(flags & NFT_XML_OPT)) {
errno = EINVAL;
err->node_name = node_name;
err->error = NFT_PARSE_EMISSINGNODE;
}
return -1;
}
ret = nft_strtoi(node->child->value.opaque, base, number, type);
if (ret != 0) {
err->error = NFT_PARSE_EBADTYPE;
err->node_name = node_name;
}
return ret;
}
const char *nft_mxml_str_parse(mxml_node_t *tree, const char *node_name,
uint32_t mxml_flags, uint16_t flags,
struct nft_parse_err *err)
{
mxml_node_t *node;
const char *ret;
node = mxmlFindElement(tree, tree, node_name, NULL, NULL, mxml_flags);
if (node == NULL || node->child == NULL) {
if (!(flags & NFT_XML_OPT)) {
errno = EINVAL;
err->node_name = node_name;
err->error = NFT_PARSE_EMISSINGNODE;
}
return NULL;
}
ret = node->child->value.opaque;
if (ret == NULL) {
err->node_name = node_name;
err->error = NFT_PARSE_EBADTYPE;
}
return ret;
}
int nft_mxml_family_parse(mxml_node_t *tree, const char *node_name,
uint32_t mxml_flags, uint16_t flags,
struct nft_parse_err *err)
{
const char *family_str;
int family;
family_str = nft_mxml_str_parse(tree, node_name, mxml_flags,
flags, err);
if (family_str == NULL)
return -1;
family = nft_str2family(family_str);
if (family < 0) {
err->node_name = node_name;
errno = EAFNOSUPPORT;
}
return family;
}
#endif
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