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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 <libnftables/rule.h>
#include <libnftables/expr.h>
#include <libnftables/set.h>
#ifdef XML_PARSING
struct nft_rule_expr *nft_mxml_expr_parse(mxml_node_t *node)
{
mxml_node_t *tree;
struct nft_rule_expr *e;
const char *expr_name;
char *xml_text;
int ret;
expr_name = mxmlElementGetAttr(node, "type");
if (expr_name == NULL)
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);
mxmlDelete(tree);
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 flags)
{
mxml_node_t *node;
uint64_t val;
node = mxmlFindElement(tree, tree, reg_name, NULL, NULL, flags);
if (node == NULL) {
errno = EINVAL;
goto err;
}
if (nft_strtoi(node->child->value.opaque, BASE_DEC, &val,
NFT_TYPE_U64) != 0)
goto err;
if (val > NFT_REG_MAX) {
errno = ERANGE;
goto err;
}
return val;
err:
return -1;
}
int nft_mxml_data_reg_parse(mxml_node_t *tree, const char *node_name,
union nft_data_reg *data_reg)
{
mxml_node_t *node;
const char *type;
char *tmpstr = NULL;
int ret;
node = mxmlFindElement(tree, tree, node_name, NULL, NULL,
MXML_DESCEND_FIRST);
if (node == NULL || node->child == NULL) {
errno = EINVAL;
goto err;
}
tmpstr = mxmlSaveAllocString(node, MXML_NO_CALLBACK);
if (tmpstr == NULL) {
errno = ENOMEM;
goto err;
}
ret = nft_data_reg_xml_parse(data_reg, tmpstr);
xfree(tmpstr);
if (ret < 0) {
errno = EINVAL;
goto err;
}
node = mxmlFindElement(node, node, "data_reg", NULL, NULL,
MXML_DESCEND);
if (node == NULL || node->child == NULL) {
errno = EINVAL;
goto err;
}
type = mxmlElementGetAttr(node, "type");
if (type == NULL) {
errno = EINVAL;
goto err;
}
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;
err:
return -1;
}
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)
{
mxml_node_t *node = NULL;
node = mxmlFindElement(tree, tree, node_name, NULL, NULL, mxml_flags);
if (node == NULL || node->child == NULL) {
errno = EINVAL;
return -1;
}
return nft_strtoi(node->child->value.opaque, base, number, type);
}
const char *nft_mxml_str_parse(mxml_node_t *tree, const char *node_name,
uint32_t mxml_flags)
{
mxml_node_t *node;
node = mxmlFindElement(tree, tree, node_name, NULL, NULL, mxml_flags);
if (node == NULL || node->child == NULL) {
errno = EINVAL;
return NULL;
}
return strdup(node->child->value.opaque);
}
int nft_mxml_family_parse(mxml_node_t *tree, const char *node_name,
uint32_t mxml_flags)
{
const char *family_str;
int family;
family_str = nft_mxml_str_parse(tree, node_name, mxml_flags);
if (family_str == NULL)
return -1;
family = nft_str2family(family_str);
xfree(family_str);
if (family < 0)
errno = EAFNOSUPPORT;
return family;
}
struct nft_set_elem *nft_mxml_set_elem_parse(mxml_node_t *node)
{
mxml_node_t *save;
char *set_elem_str;
struct nft_set_elem *elem;
if (node == NULL)
goto einval;
if (strcmp(node->value.opaque, "set_elem") != 0)
goto einval;
elem = nft_set_elem_alloc();
if (elem == NULL)
goto enomem;
/* This is a hack for mxml to print just the current node */
save = node->next;
node->next = NULL;
set_elem_str = mxmlSaveAllocString(node, MXML_NO_CALLBACK);
node->next = save;
if (set_elem_str == NULL) {
xfree(elem);
goto enomem;
}
if (nft_set_elem_parse(elem, NFT_SET_PARSE_XML,
set_elem_str) != 0) {
xfree(set_elem_str);
xfree(elem);
return NULL;
}
xfree(set_elem_str);
return elem;
einval:
errno = EINVAL;
return NULL;
enomem:
errno = ENOMEM;
return NULL;
}
#endif
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