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/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
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; version 2 dated June, 1991, or
(at your option) version 3 dated 29 June, 2007.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dnsmasq.h"
#if defined (HAVE_NFTSET) && defined (HAVE_LINUX_NETWORK)
#include <nftables/libnftables.h>
#include <string.h>
#include <arpa/inet.h>
static struct nft_ctx *ctx = NULL;
static const char *cmd_add = "add element %s { %s }";
static const char *cmd_del = "delete element %s { %s }";
void nftset_init()
{
ctx = nft_ctx_new(NFT_CTX_DEFAULT);
if (ctx == NULL)
die(_("failed to create nftset context"), NULL, EC_MISC);
/* disable libnftables output */
nft_ctx_buffer_error(ctx);
}
int add_to_nftset(const char *setname, const union all_addr *ipaddr, int flags, int remove)
{
const char *cmd = remove ? cmd_del : cmd_add;
int ret, af = (flags & F_IPV4) ? AF_INET : AF_INET6;
size_t new_sz;
char *new, *err, *nl;
static char *cmd_buf = NULL;
static size_t cmd_buf_sz = 0;
inet_ntop(af, ipaddr, daemon->addrbuff, ADDRSTRLEN);
if (setname[1] == ' ' && (setname[0] == '4' || setname[0] == '6'))
{
if (setname[0] == '4' && !(flags & F_IPV4))
return -1;
if (setname[0] == '6' && !(flags & F_IPV6))
return -1;
setname += 2;
}
if (cmd_buf_sz == 0)
new_sz = 150; /* initial allocation */
else
new_sz = snprintf(cmd_buf, cmd_buf_sz, cmd, setname, daemon->addrbuff);
if (new_sz > cmd_buf_sz)
{
if (!(new = whine_malloc(new_sz + 10)))
return 0;
if (cmd_buf)
free(cmd_buf);
cmd_buf = new;
cmd_buf_sz = new_sz + 10;
snprintf(cmd_buf, cmd_buf_sz, cmd, setname, daemon->addrbuff);
}
ret = nft_run_cmd_from_buffer(ctx, cmd_buf);
err = (char *)nft_ctx_get_error_buffer(ctx);
if (ret != 0)
{
/* Log only first line of error return. */
if ((nl = strchr(err, '\n')))
*nl = 0;
my_syslog(LOG_ERR, "nftset %s %s", setname, err);
}
return ret;
}
#endif
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