diff options
author | Pablo Neira Ayuso <pablo@netfilter.org> | 2012-10-14 20:33:08 +0200 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2012-10-14 21:15:42 +0200 |
commit | 82168f934d5465dda7f0d165d384fc46bd86fab8 (patch) | |
tree | 1b6782f22706bf17bf72803e68452c081497b556 /examples | |
parent | e98c005917e3c906494e2dc550a2fa8a394e462b (diff) |
examples: add nft-events
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'examples')
-rw-r--r-- | examples/Makefile.am | 4 | ||||
-rw-r--r-- | examples/nft-events.c | 154 |
2 files changed, 158 insertions, 0 deletions
diff --git a/examples/Makefile.am b/examples/Makefile.am index 31e53bf..9b9e345 100644 --- a/examples/Makefile.am +++ b/examples/Makefile.am @@ -9,6 +9,7 @@ check_PROGRAMS = nft-table-add \ nft-rule-add \ nft-rule-del \ nft-rule-get \ + nft-events \ nft-compat-get nft_table_add_SOURCES = nft-table-add.c @@ -38,5 +39,8 @@ nft_rule_del_LDADD = ../src/libnftables.la ${LIBMNL_LIBS} nft_rule_get_SOURCES = nft-rule-get.c nft_rule_get_LDADD = ../src/libnftables.la ${LIBMNL_LIBS} +nft_events_SOURCES = nft-events.c +nft_events_LDADD = ../src/libnftables.la ${LIBMNL_LIBS} + nft_compat_get_SOURCES = nft-compat-get.c nft_compat_get_LDADD = ../src/libnftables.la ${LIBMNL_LIBS} diff --git a/examples/nft-events.c b/examples/nft-events.c new file mode 100644 index 0000000..aa8c85e --- /dev/null +++ b/examples/nft-events.c @@ -0,0 +1,154 @@ +/* + * (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 software has been sponsored by Sophos Astaro <http://www.sophos.com> + */ + +#include <stdlib.h> +#include <time.h> +#include <string.h> +#include <netinet/in.h> + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nf_tables.h> + +#include <libmnl/libmnl.h> +#include <libnftables/table.h> +#include <libnftables/chain.h> +#include <libnftables/rule.h> + +static int table_cb(const struct nlmsghdr *nlh, int type) +{ + struct nft_table *t; + char buf[4096]; + + t = nft_table_alloc(); + if (t == NULL) { + perror("OOM"); + goto err; + } + + if (nft_table_nlmsg_parse(nlh, t) < 0) { + perror("nft_table_nlmsg_parse"); + goto err_free; + } + + nft_table_snprintf(buf, sizeof(buf), t, NFT_TABLE_O_DEFAULT, 0); + printf("[%s]\t%s", type == NFT_MSG_NEWTABLE ? "NEW" : "DEL", buf); + +err_free: + nft_table_free(t); +err: + return MNL_CB_OK; +} + +static int rule_cb(const struct nlmsghdr *nlh, int type) +{ + struct nft_rule *t; + char buf[4096]; + + t = nft_rule_alloc(); + if (t == NULL) { + perror("OOM"); + goto err; + } + + if (nft_rule_nlmsg_parse(nlh, t) < 0) { + perror("nft_rule_nlmsg_parse"); + goto err_free; + } + + nft_rule_snprintf(buf, sizeof(buf), t, NFT_RULE_O_DEFAULT, 0); + printf("[%s]\t%s", type == NFT_MSG_NEWRULE ? "NEW" : "DEL", buf); + +err_free: + nft_rule_free(t); +err: + return MNL_CB_OK; +} + +static int chain_cb(const struct nlmsghdr *nlh, int type) +{ + struct nft_chain *t; + char buf[4096]; + + t = nft_chain_alloc(); + if (t == NULL) { + perror("OOM"); + goto err; + } + + if (nft_chain_nlmsg_parse(nlh, t) < 0) { + perror("nft_chain_nlmsg_parse"); + goto err_free; + } + + nft_chain_snprintf(buf, sizeof(buf), t, NFT_CHAIN_O_DEFAULT, 0); + printf("[%s]\t%s", type == NFT_MSG_NEWCHAIN ? "NEW" : "DEL", buf); + +err_free: + nft_chain_free(t); +err: + return MNL_CB_OK; +} + +static int events_cb(const struct nlmsghdr *nlh, void *data) +{ + int ret = MNL_CB_OK; + int type = nlh->nlmsg_type & 0xFF; + + switch(type) { + case NFT_MSG_NEWTABLE: + case NFT_MSG_DELTABLE: + ret = table_cb(nlh, type); + break; + case NFT_MSG_NEWCHAIN: + case NFT_MSG_DELCHAIN: + ret = chain_cb(nlh, type); + break; + case NFT_MSG_NEWRULE: + case NFT_MSG_DELRULE: + ret = rule_cb(nlh, type); + break; + } + + return ret; +} + +int main(int argc, char *argv[]) +{ + struct mnl_socket *nl; + char buf[MNL_SOCKET_BUFFER_SIZE]; + int ret; + + nl = mnl_socket_open(NETLINK_NETFILTER); + if (nl == NULL) { + perror("mnl_socket_open"); + exit(EXIT_FAILURE); + } + + if (mnl_socket_bind(nl, (1 << (NFNLGRP_NFTABLES-1)), MNL_SOCKET_AUTOPID) < 0) { + perror("mnl_socket_bind"); + exit(EXIT_FAILURE); + } + + ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); + while (ret > 0) { + ret = mnl_cb_run(buf, ret, 0, 0, events_cb, NULL); + if (ret <= 0) + break; + ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); + } + if (ret == -1) { + perror("error"); + exit(EXIT_FAILURE); + } + mnl_socket_close(nl); + + return EXIT_SUCCESS; +} |