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/*
* (C) 2013 by Pablo Neira Ayuso <pablo@netfilter.org>
* (C) 2014 by Arturo Borrero Gonzalez <arturo@debian.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 <stdlib.h>
#include <time.h>
#include <string.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <libmnl/libmnl.h>
#include <libnftnl/chain.h>
#include <libnftnl/rule.h>
static struct nftnl_chain *chain_parse_file(const char *file, uint16_t format)
{
int fd;
struct nftnl_chain *c;
struct nftnl_parse_err *err;
char data[4096];
c = nftnl_chain_alloc();
if (c == NULL) {
perror("OOM");
return NULL;
}
fd = open(file, O_RDONLY);
if (fd < 0) {
perror("open");
return NULL;
}
if (read(fd, data, sizeof(data)) < 0) {
perror("read");
close(fd);
return NULL;
}
close(fd);
err = nftnl_parse_err_alloc();
if (err == NULL) {
perror("OOM");
return NULL;
}
if (nftnl_chain_parse(c, format, data, err) < 0) {
nftnl_parse_perror("Unable to parse file", err);
nftnl_parse_err_free(err);
return NULL;
}
nftnl_parse_err_free(err);
return c;
}
int main(int argc, char *argv[])
{
struct mnl_socket *nl;
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
uint32_t portid, seq, chain_seq;
struct nftnl_chain *c;
uint16_t family, format, outformat;
struct mnl_nlmsg_batch *batch;
int ret;
if (argc < 3) {
printf("Usage: %s {json} <file>\n", argv[0]);
exit(EXIT_FAILURE);
}
if (strcmp(argv[1], "json") == 0) {
format = NFTNL_PARSE_JSON;
outformat = NFTNL_OUTPUT_JSON;
} else {
printf("Unknown format: only json is supported\n");
exit(EXIT_FAILURE);
}
c = chain_parse_file(argv[2], format);
if (c == NULL)
exit(EXIT_FAILURE);
nftnl_chain_fprintf(stdout, c, outformat, 0);
fprintf(stdout, "\n");
nftnl_chain_unset(c, NFTNL_CHAIN_HANDLE);
family = nftnl_chain_get_u32(c, NFTNL_CHAIN_FAMILY);
seq = time(NULL);
batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
mnl_nlmsg_batch_next(batch);
chain_seq = seq;
nlh = nftnl_chain_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
NFT_MSG_NEWCHAIN, family,
NLM_F_ACK, seq++);
nftnl_chain_nlmsg_build_payload(nlh, c);
nftnl_chain_free(c);
mnl_nlmsg_batch_next(batch);
nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
mnl_nlmsg_batch_next(batch);
nl = mnl_socket_open(NETLINK_NETFILTER);
if (nl == NULL) {
perror("mnl_socket_open");
exit(EXIT_FAILURE);
}
if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
perror("mnl_socket_bind");
exit(EXIT_FAILURE);
}
portid = mnl_socket_get_portid(nl);
if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
mnl_nlmsg_batch_size(batch)) < 0) {
perror("mnl_socket_send");
exit(EXIT_FAILURE);
}
mnl_nlmsg_batch_stop(batch);
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, chain_seq, portid, NULL, 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;
}
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