diff options
author | Pablo Neira Ayuso <pablo@netfilter.org> | 2012-09-27 19:12:53 +0200 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-12-30 23:50:09 +0100 |
commit | 384958620abab397062b67fb2763e813b63f74f0 (patch) | |
tree | ec01cb88585150a37f122bfbf39ea33218bafdb6 /iptables/xtables-config.c | |
parent | 99b85b7837707bd6c6d578c9328e1321fceb8082 (diff) |
use nf_tables and nf_tables compatibility interface
This patch adds the following utilities:
* xtables
* xtables-restore
* xtables-save
* xtables-config
They all use Patrick's nf_tables infrastructure plus my compatibility
layer.
xtables, xtables-restore and xtables-save are syntax compatible with
ip[6]tables, ip[6]tables-restore and ip[6]tables-save.
Semantics aims to be similar, still the main exception is that there
is no commit operation. Thus, we incrementally add/delete rules without
entire table locking.
The following options are also not yet implemented:
-Z (this requires adding expr->ops->reset(...) so nft_counters can reset
internal state of expressions while dumping it)
-R and -E (this requires adding this feature to nf_tables)
-f (can be implemented with expressions: payload 6 (2-bytes) + bitwise a&b^!b + cmp neq 0)
-IPv6 support.
But those are a matter of time to get them done.
A new utility, xtables-config, is available to register tables and
chains. By default there is a configuration file that adds backward
compatible tables and chains under iptables/etc/xtables.conf. You have
to call this utility first to register tables and chains.
However, it would be possible to automagically register tables and
chains while using xtables and xtables-restore to get similar operation
than with iptables.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'iptables/xtables-config.c')
-rw-r--r-- | iptables/xtables-config.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/iptables/xtables-config.c b/iptables/xtables-config.c new file mode 100644 index 00000000..16918bf6 --- /dev/null +++ b/iptables/xtables-config.c @@ -0,0 +1,107 @@ +/* + * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org> + * + * 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 <stdio.h> +#include <stdlib.h> +#include <stdint.h> +#include <stdbool.h> +#include <string.h> +#include <errno.h> + +#include <libnftables/table.h> +#include <libnftables/chain.h> + +#include "xtables-multi.h" +#include "xtables-config-parser.h" + +#include "nft.h" + +extern int xtables_config_parse(const char *filename, + struct nft_table_list *table_list, + struct nft_chain_list *chain_list); + +#define XTABLES_CONFIG_DEFAULT "/etc/xtables.conf" + +int xtables_config_main(int argc, char *argv[]) +{ + struct nft_table_list *table_list = nft_table_list_alloc(); + struct nft_chain_list *chain_list = nft_chain_list_alloc(); + struct nft_table_list_iter *titer; + struct nft_chain_list_iter *citer; + struct nft_table *table; + struct nft_chain *chain; + const char *filename = NULL; + struct nft_handle h; + + if (argc > 2) { + fprintf(stderr, "Usage: %s [<config_file>]\n", argv[0]); + return EXIT_SUCCESS; + } + if (argc == 1) + filename = XTABLES_CONFIG_DEFAULT; + else + filename = argv[1]; + + if (xtables_config_parse(filename, table_list, chain_list) < 0) { + if (errno == ENOENT) { + fprintf(stderr, "configuration file `%s' does not " + "exists\n", filename); + } else { + fprintf(stderr, "Fatal error: %s\n", strerror(errno)); + } + return EXIT_FAILURE; + } + + nft_init(&h); + + /* Stage 1) create tables */ + titer = nft_table_list_iter_create(table_list); + while ((table = nft_table_list_iter_next(titer)) != NULL) { + if (nft_table_add(&h, table) < 0) { + if (errno == EEXIST) { + printf("table `%s' already exists, skipping\n", + (char *)nft_table_attr_get(table, NFT_TABLE_ATTR_NAME)); + } else { + printf("table `%s' cannot be create, reason `%s'. Exitting\n", + (char *)nft_table_attr_get(table, NFT_TABLE_ATTR_NAME), + strerror(errno)); + return EXIT_FAILURE; + } + continue; + } + printf("table `%s' has been created\n", + (char *)nft_table_attr_get(table, NFT_TABLE_ATTR_NAME)); + } + + /* Stage 2) create chains */ + citer = nft_chain_list_iter_create(chain_list); + while ((chain = nft_chain_list_iter_next(citer)) != NULL) { + if (nft_chain_add(&h, chain) < 0) { + if (errno == EEXIST) { + printf("chain `%s' already exists in table `%s', skipping\n", + (char *)nft_chain_attr_get(chain, NFT_CHAIN_ATTR_NAME), + (char *)nft_chain_attr_get(chain, NFT_CHAIN_ATTR_TABLE)); + } else { + printf("chain `%s' cannot be create, reason `%s'. Exitting\n", + (char *)nft_chain_attr_get(chain, NFT_CHAIN_ATTR_NAME), + strerror(errno)); + return EXIT_FAILURE; + } + continue; + } + + printf("chain `%s' in table `%s' has been created\n", + (char *)nft_chain_attr_get(chain, NFT_CHAIN_ATTR_NAME), + (char *)nft_chain_attr_get(chain, NFT_CHAIN_ATTR_TABLE)); + } + + return EXIT_SUCCESS; +} |