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#ifndef _LIBXT_SET_H
#define _LIBXT_SET_H
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
static int
get_version(unsigned *version)
{
int res, sockfd = socket(AF_INET, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW);
struct ip_set_req_version req_version;
socklen_t size = sizeof(req_version);
if (sockfd < 0)
xtables_error(OTHER_PROBLEM,
"Can't open socket to ipset.\n");
req_version.op = IP_SET_OP_VERSION;
res = getsockopt(sockfd, SOL_IP, SO_IP_SET, &req_version, &size);
if (res != 0)
xtables_error(OTHER_PROBLEM,
"Kernel module xt_set is not loaded in.\n");
*version = req_version.version;
return sockfd;
}
static void
get_set_byid(char *setname, ip_set_id_t idx)
{
struct ip_set_req_get_set req;
socklen_t size = sizeof(struct ip_set_req_get_set);
int res, sockfd;
sockfd = get_version(&req.version);
req.op = IP_SET_OP_GET_BYINDEX;
req.set.index = idx;
res = getsockopt(sockfd, SOL_IP, SO_IP_SET, &req, &size);
close(sockfd);
if (res != 0)
xtables_error(OTHER_PROBLEM,
"Problem when communicating with ipset, errno=%d.\n",
errno);
if (size != sizeof(struct ip_set_req_get_set))
xtables_error(OTHER_PROBLEM,
"Incorrect return size from kernel during ipset lookup, "
"(want %zu, got %zu)\n",
sizeof(struct ip_set_req_get_set), (size_t)size);
if (req.set.name[0] == '\0')
xtables_error(PARAMETER_PROBLEM,
"Set with index %i in kernel doesn't exist.\n", idx);
strncpy(setname, req.set.name, IPSET_MAXNAMELEN);
}
static void
get_set_byname_only(const char *setname, struct xt_set_info *info,
int sockfd, unsigned int version)
{
struct ip_set_req_get_set req = { .version = version };
socklen_t size = sizeof(struct ip_set_req_get_set);
int res;
req.op = IP_SET_OP_GET_BYNAME;
strncpy(req.set.name, setname, IPSET_MAXNAMELEN);
req.set.name[IPSET_MAXNAMELEN - 1] = '\0';
res = getsockopt(sockfd, SOL_IP, SO_IP_SET, &req, &size);
close(sockfd);
if (res != 0)
xtables_error(OTHER_PROBLEM,
"Problem when communicating with ipset, errno=%d.\n",
errno);
if (size != sizeof(struct ip_set_req_get_set))
xtables_error(OTHER_PROBLEM,
"Incorrect return size from kernel during ipset lookup, "
"(want %zu, got %zu)\n",
sizeof(struct ip_set_req_get_set), (size_t)size);
if (req.set.index == IPSET_INVALID_ID)
xtables_error(PARAMETER_PROBLEM,
"Set %s doesn't exist.\n", setname);
info->index = req.set.index;
}
static void
get_set_byname(const char *setname, struct xt_set_info *info)
{
struct ip_set_req_get_set_family req;
socklen_t size = sizeof(struct ip_set_req_get_set_family);
int res, sockfd, version;
sockfd = get_version(&req.version);
version = req.version;
req.op = IP_SET_OP_GET_FNAME;
strncpy(req.set.name, setname, IPSET_MAXNAMELEN);
req.set.name[IPSET_MAXNAMELEN - 1] = '\0';
res = getsockopt(sockfd, SOL_IP, SO_IP_SET, &req, &size);
if (res != 0 && errno == EBADMSG)
/* Backward compatibility */
return get_set_byname_only(setname, info, sockfd, version);
close(sockfd);
if (res != 0)
xtables_error(OTHER_PROBLEM,
"Problem when communicating with ipset, errno=%d.\n",
errno);
if (size != sizeof(struct ip_set_req_get_set_family))
xtables_error(OTHER_PROBLEM,
"Incorrect return size from kernel during ipset lookup, "
"(want %zu, got %zu)\n",
sizeof(struct ip_set_req_get_set_family),
(size_t)size);
if (req.set.index == IPSET_INVALID_ID)
xtables_error(PARAMETER_PROBLEM,
"Set %s doesn't exist.\n", setname);
if (!(req.family == afinfo->family ||
req.family == NFPROTO_UNSPEC))
xtables_error(PARAMETER_PROBLEM,
"The protocol family of set %s is %s, "
"which is not applicable.\n",
setname,
req.family == NFPROTO_IPV4 ? "IPv4" : "IPv6");
info->index = req.set.index;
}
static void
parse_dirs_v0(const char *opt_arg, struct xt_set_info_v0 *info)
{
char *saved = xtables_strdup(opt_arg);
char *ptr, *tmp = saved;
int i = 0;
while (i < (IPSET_DIM_MAX - 1) && tmp != NULL) {
ptr = strsep(&tmp, ",");
if (strncmp(ptr, "src", 3) == 0)
info->u.flags[i++] |= IPSET_SRC;
else if (strncmp(ptr, "dst", 3) == 0)
info->u.flags[i++] |= IPSET_DST;
else
xtables_error(PARAMETER_PROBLEM,
"You must specify (the comma separated list of) 'src' or 'dst'.");
}
if (tmp)
xtables_error(PARAMETER_PROBLEM,
"Can't be more src/dst options than %i.",
IPSET_DIM_MAX);
free(saved);
}
static void
parse_dirs(const char *opt_arg, struct xt_set_info *info)
{
char *saved = xtables_strdup(opt_arg);
char *ptr, *tmp = saved;
while (info->dim < IPSET_DIM_MAX && tmp != NULL) {
info->dim++;
ptr = strsep(&tmp, ",");
if (strncmp(ptr, "src", 3) == 0)
info->flags |= (1 << info->dim);
else if (strncmp(ptr, "dst", 3) != 0)
xtables_error(PARAMETER_PROBLEM,
"You must specify (the comma separated list of) 'src' or 'dst'.");
}
if (tmp)
xtables_error(PARAMETER_PROBLEM,
"Can't be more src/dst options than %i.",
IPSET_DIM_MAX);
free(saved);
}
#endif /*_LIBXT_SET_H*/
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