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