/*
    * firewall3 - 3rd OpenWrt UCI firewall implementation
    *
    *   Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
    *
    * Permission to use, copy, modify, and/or distribute this software for any
    * purpose with or without fee is hereby granted, provided that the above
    * copyright notice and this permission notice appear in all copies.
    *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #define _GNU_SOURCE /* RTLD_NEXT */
  
  /* include userspace headers */
  #include <dlfcn.h>
  #include <unistd.h>
  #include <getopt.h>
  #include <net/if.h>
  #include <netinet/in.h>
  #include <sys/utsname.h>
  #include <sys/socket.h>
  
  /* prevent indirect inclusion of kernel headers */
  #define _LINUX_IF_H
  #define _LINUX_IN_H
  #define _LINUX_IN6_H
  
  /* prevent libiptc from including kernel headers */
  #define _FWCHAINS_KERNEL_HEADERS_H
  
  /* finally include libiptc and xtables */
  #include <libiptc/libiptc.h>
  #include <libiptc/libip6tc.h>
  #include <xtables.h>
  
  #include <setjmp.h>
  
  #include "options.h"
  
  /* xtables interface */
  #if (XTABLES_VERSION_CODE >= 10)
  # include "xtables-10.h"
  #elif (XTABLES_VERSION_CODE == 5)
  # include "xtables-5.h"
  #else
  # error "Unsupported xtables version"
  #endif
  
  #include "iptables.h"
  
  #define XT_LOCK_NAME "/var/run/xtables.lock"
  static int xt_lock_fd = -1;
  
  struct fw3_ipt_rule {
          struct fw3_ipt_handle *h;
  
          union {
                  struct ipt_entry e;
                  struct ip6t_entry e6;
          };
  
          struct xtables_rule_match *matches;
          struct xtables_target *target;
  
          int argc;
          char **argv;
  
          uint32_t protocol;
          bool protocol_loaded;
  };
  
  static struct option base_opts[] = {
          { .name = "match",         .has_arg = 1, .val = 'm' },
          { .name = "jump",          .has_arg = 1, .val = 'j' },
          { .name = "in-interface",  .has_arg = 1, .val = 'i' },
          { .name = "out-interface", .has_arg = 1, .val = 'o' },
          { .name = "source",        .has_arg = 1, .val = 's' },
          { .name = "destination",   .has_arg = 1, .val = 'd' },
          { NULL }
  };
  
  
  static jmp_buf fw3_ipt_error_jmp;
  
  static __attribute__((noreturn))
  void fw3_ipt_error_handler(enum xtables_exittype status,
                             const char *fmt, ...)
  {
          va_list args;
  
          fprintf(stderr, "     ! Exception: ");
  
         va_start(args, fmt);
         vfprintf(stderr, fmt, args);
         va_end(args);
 
         longjmp(fw3_ipt_error_jmp, status);
 }
 
 static struct xtables_globals xtg = {
         .option_offset = 0,
         .program_version = "4",
         .orig_opts = base_opts,
         .exit_err = fw3_ipt_error_handler,
 #if XTABLES_VERSION_CODE > 10
         .compat_rev = xtables_compatible_revision,
 #endif
 };
 
 static struct xtables_globals xtg6 = {
         .option_offset = 0,
         .program_version = "6",
         .orig_opts = base_opts,
         .exit_err = fw3_ipt_error_handler,
 #if XTABLES_VERSION_CODE > 10
         .compat_rev = xtables_compatible_revision,
 #endif
 };
 
 static struct {
         bool retain;
         int mcount, tcount;
         struct xtables_match **matches;
         struct xtables_target **targets;
         void (*register_match)(struct xtables_match *);
         void (*register_target)(struct xtables_target *);
 } xext;
 
 
 /* Required by certain extensions like SNAT and DNAT */
 int kernel_version = 0;
 
 void
 get_kernel_version(void)
 {
         static struct utsname uts;
         int x = 0, y = 0, z = 0;
 
         if (uname(&uts) == -1)
                 sprintf(uts.release, "3.0.0");
 
         sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
         kernel_version = 0x10000 * x + 0x100 * y + z;
 }
 
 static void fw3_init_extensions(void)
 {
         init_extensions();
         init_extensions4();
 
 #ifndef DISABLE_IPV6
         init_extensions6();
 #endif
 }
 
 struct fw3_ipt_handle *
 fw3_ipt_open(enum fw3_family family, enum fw3_table table)
 {
         int i;
         struct fw3_ipt_handle *h;
 
         h = fw3_alloc(sizeof(*h));
 
         xtables_init();
 
         while (!fw3_lock_path(&xt_lock_fd, XT_LOCK_NAME)) {
                 warn("Currently busy xtables.lock - wait 1 second");
                 sleep(1);
         }
 
         if (family == FW3_FAMILY_V6)
         {
 #ifndef DISABLE_IPV6
                 h->family = FW3_FAMILY_V6;
                 h->table  = table;
                 h->handle = ip6tc_init(fw3_flag_names[table]);
 
                 xtables_set_params(&xtg6);
                 xtables_set_nfproto(NFPROTO_IPV6);
 #endif
         }
         else
         {
                 h->family = FW3_FAMILY_V4;
                 h->table  = table;
                 h->handle = iptc_init(fw3_flag_names[table]);
 
                 xtables_set_params(&xtg);
                 xtables_set_nfproto(NFPROTO_IPV4);
         }
 
         if (!h->handle)
         {
                 free(h);
                 fw3_unlock_path(&xt_lock_fd, XT_LOCK_NAME);
                 return NULL;
         }
 
         fw3_xt_reset();
         fw3_init_extensions();
 
         if (xext.register_match)
                 for (i = 0; i < xext.mcount; i++)
                         xext.register_match(xext.matches[i]);
 
         if (xext.register_target)
                 for (i = 0; i < xext.tcount; i++)
                         xext.register_target(xext.targets[i]);
 
         return h;
 }
 
 static void
 debug(struct fw3_ipt_handle *h, const char *fmt, ...)
 {
         va_list ap;
 
         printf("%s -t %s ", (h->family == FW3_FAMILY_V6) ? "ip6tables" : "iptables",
                             fw3_flag_names[h->table]);
 
         va_start(ap, fmt);
         vprintf(fmt, ap);
         va_end(ap);
 }
 
 void
 fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
                    enum fw3_flag policy)
 {
         if (fw3_pr_debug)
                 debug(h, "-P %s %s\n", chain, fw3_flag_names[policy]);
 
 #ifndef DISABLE_IPV6
         if (h->family == FW3_FAMILY_V6)
                 ip6tc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
         else
 #endif
                 iptc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
 }
 
 void
 fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain)
 {
         if (fw3_pr_debug)
                 debug(h, "-F %s\n", chain);
 
 #ifndef DISABLE_IPV6
         if (h->family == FW3_FAMILY_V6)
                 ip6tc_flush_entries(chain, h->handle);
         else
 #endif
                 iptc_flush_entries(chain, h->handle);
 }
 
 static void
 delete_rules(struct fw3_ipt_handle *h, const char *target)
 {
         unsigned int num;
         const struct ipt_entry *e;
         const char *chain;
         const char *t;
         bool found;
 
 #ifndef DISABLE_IPV6
         if (h->family == FW3_FAMILY_V6)
         {
                 for (chain = ip6tc_first_chain(h->handle);
                      chain != NULL;
                      chain = ip6tc_next_chain(h->handle))
                 {
                         do {
                                 found = false;
 
                                 const struct ip6t_entry *e6;
                                 for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
                                          e6 != NULL;
                                          num++, e6 = ip6tc_next_rule(e6, h->handle))
                                 {
                                         t = ip6tc_get_target(e6, h->handle);
 
                                         if (*t && !strcmp(t, target))
                                         {
                                                 if (fw3_pr_debug)
                                                         debug(h, "-D %s %u\n", chain, num + 1);
 
                                                 ip6tc_delete_num_entry(chain, num, h->handle);
                                                 found = true;
                                                 break;
                                         }
                                 }
                         } while (found);
                 }
         }
         else
 #endif
         {
                 for (chain = iptc_first_chain(h->handle);
                      chain != NULL;
                      chain = iptc_next_chain(h->handle))
                 {
                         do {
                                 found = false;
 
                                 for (num = 0, e = iptc_first_rule(chain, h->handle);
                                      e != NULL;
                                          num++, e = iptc_next_rule(e, h->handle))
                                 {
                                         t = iptc_get_target(e, h->handle);
 
                                         if (*t && !strcmp(t, target))
                                         {
                                                 if (fw3_pr_debug)
                                                         debug(h, "-D %s %u\n", chain, num + 1);
 
                                                 iptc_delete_num_entry(chain, num, h->handle);
                                                 found = true;
                                                 break;
                                         }
                                 }
                         } while (found);
                 }
         }
 }
 
 void
 fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
 {
         delete_rules(h, chain);
 
         if (fw3_pr_debug)
                 debug(h, "-X %s\n", chain);
 
 #ifndef DISABLE_IPV6
         if (h->family == FW3_FAMILY_V6)
                 ip6tc_delete_chain(chain, h->handle);
         else
 #endif
                 iptc_delete_chain(chain, h->handle);
 }
 
 static bool
 has_rule_tag(const void *base, unsigned int start, unsigned int end)
 {
         unsigned int i;
         const struct xt_entry_match *em;
 
         for (i = start; i < end; i += em->u.match_size)
         {
                 em = base + i;
 
                 if (strcmp(em->u.user.name, "comment"))
                         continue;
 
                 if (!memcmp(em->data, "!fw3", 4))
                         return true;
         }
 
         return false;
 }
 
 void
 fw3_ipt_delete_id_rules(struct fw3_ipt_handle *h, const char *chain)
 {
         unsigned int num;
         const struct ipt_entry *e;
         bool found;
 
 #ifndef DISABLE_IPV6
         if (h->family == FW3_FAMILY_V6)
         {
                 if (!ip6tc_is_chain(chain, h->handle))
                         return;
 
                 do {
                         found = false;
 
                         const struct ip6t_entry *e6;
                         for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
                                  e6 != NULL;
                                  num++, e6 = ip6tc_next_rule(e6, h->handle))
                         {
                                 if (has_rule_tag(e6, sizeof(*e6), e6->target_offset))
                                 {
                                         if (fw3_pr_debug)
                                                 debug(h, "-D %s %u\n", chain, num + 1);
 
                                         ip6tc_delete_num_entry(chain, num, h->handle);
                                         found = true;
                                         break;
                                 }
                         }
                 } while (found);
         }
         else
 #endif
         {
                 if (!iptc_is_chain(chain, h->handle))
                         return;
 
                 do {
                         found = false;
 
                         for (num = 0, e = iptc_first_rule(chain, h->handle);
                                  e != NULL;
                                  num++, e = iptc_next_rule(e, h->handle))
                         {
                                 if (has_rule_tag(e, sizeof(*e), e->target_offset))
                                 {
                                         if (fw3_pr_debug)
                                                 debug(h, "-D %s %u\n", chain, num + 1);
 
                                         iptc_delete_num_entry(chain, num, h->handle);
                                         found = true;
                                         break;
                                 }
                         }
                 } while (found);
         }
 }
 
 void
 fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...)
 {
         char buf[32];
         va_list ap;
 
         va_start(ap, fmt);
         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
         va_end(ap);
 
         if (fw3_pr_debug)
                 debug(h, "-N %s\n", buf);
 
         iptc_create_chain(buf, h->handle);
 }
 
 void
 fw3_ipt_flush(struct fw3_ipt_handle *h)
 {
         const char *chain;
 
 #ifndef DISABLE_IPV6
         if (h->family == FW3_FAMILY_V6)
         {
                 for (chain = ip6tc_first_chain(h->handle);
                      chain != NULL;
                      chain = ip6tc_next_chain(h->handle))
                 {
                         ip6tc_flush_entries(chain, h->handle);
                 }
 
                 for (chain = ip6tc_first_chain(h->handle);
                      chain != NULL;
                      chain = ip6tc_next_chain(h->handle))
                 {
                         ip6tc_delete_chain(chain, h->handle);
                 }
         }
         else
 #endif
         {
                 for (chain = iptc_first_chain(h->handle);
                      chain != NULL;
                      chain = iptc_next_chain(h->handle))
                 {
                         iptc_flush_entries(chain, h->handle);
                 }
 
                 for (chain = iptc_first_chain(h->handle);
                      chain != NULL;
                      chain = iptc_next_chain(h->handle))
                 {
                         iptc_delete_chain(chain, h->handle);
                 }
         }
 }
 
 static bool
 chain_is_empty(struct fw3_ipt_handle *h, const char *chain)
 {
 #ifndef DISABLE_IPV6
         if (h->family == FW3_FAMILY_V6)
                 return (!ip6tc_builtin(chain, h->handle) &&
                         !ip6tc_first_rule(chain, h->handle));
 #endif
 
         return (!iptc_builtin(chain, h->handle) &&
                 !iptc_first_rule(chain, h->handle));
 }
 
 void
 fw3_ipt_gc(struct fw3_ipt_handle *h)
 {
         const char *chain;
         bool found;
 
 #ifndef DISABLE_IPV6
         if (h->family == FW3_FAMILY_V6)
         {
                 do {
                         found = false;
 
                         for (chain = ip6tc_first_chain(h->handle);
                                  chain != NULL;
                                  chain = ip6tc_next_chain(h->handle))
                         {
                                 if (!chain_is_empty(h, chain))
                                         continue;
 
                                 fw3_ipt_delete_chain(h, chain);
                                 found = true;
                                 break;
                         }
                 } while(found);
         }
         else
 #endif
         {
                 do {
                         found = false;
 
                         for (chain = iptc_first_chain(h->handle);
                                  chain != NULL;
                                  chain = iptc_next_chain(h->handle))
                         {
                                 warn("C=%s\n", chain);
 
                                 if (!chain_is_empty(h, chain))
                                         continue;
 
                                 warn("D=%s\n", chain);
 
                                 fw3_ipt_delete_chain(h, chain);
                                 found = true;
                                 break;
                         }
                 } while (found);
         }
 }
 
 void
 fw3_ipt_commit(struct fw3_ipt_handle *h)
 {
         int rv;
 
 #ifndef DISABLE_IPV6
         if (h->family == FW3_FAMILY_V6)
         {
                 rv = ip6tc_commit(h->handle);
                 if (!rv)
                         warn("ip6tc_commit(): %s", ip6tc_strerror(errno));
         }
         else
 #endif
         {
                 rv = iptc_commit(h->handle);
                 if (!rv)
                         warn("iptc_commit(): %s", iptc_strerror(errno));
         }
 }
 
 void
 fw3_ipt_close(struct fw3_ipt_handle *h)
 {
         fw3_unlock_path(&xt_lock_fd, XT_LOCK_NAME);
         free(h);
 }
 
 struct fw3_ipt_rule *
 fw3_ipt_rule_new(struct fw3_ipt_handle *h)
 {
         struct fw3_ipt_rule *r;
 
         r = fw3_alloc(sizeof(*r));
 
         r->h = h;
         r->argv = fw3_alloc(sizeof(char *));
         r->argv[r->argc++] = "fw3";
 
         return r;
 }
 
 
 static bool
 is_chain(struct fw3_ipt_handle *h, const char *name)
 {
 #ifndef DISABLE_IPV6
         if (h->family == FW3_FAMILY_V6)
                 return ip6tc_is_chain(name, h->handle);
         else
 #endif
                 return iptc_is_chain(name, h->handle);
 }
 
 static char *
 get_protoname(struct fw3_ipt_rule *r)
 {
         const struct xtables_pprot *pp;
 
         if (r->protocol)
                 for (pp = xtables_chain_protos; pp->name; pp++)
                         if (pp->num == r->protocol)
                                 return (char *)pp->name;
 
         return NULL;
 }
 
 static struct xtables_match *
 find_match(struct fw3_ipt_rule *r, const char *name)
 {
         struct xtables_match *m;
 
         xext.retain = true;
         m = xtables_find_match(name, XTF_TRY_LOAD, &r->matches);
         xext.retain = false;
 
         return m;
 }
 
 static void
 init_match(struct fw3_ipt_rule *r, struct xtables_match *m, bool no_clone)
 {
         size_t s;
         struct xtables_globals *g;
 
         if (!m)
                 return;
 
         s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
 
         m->m = fw3_alloc(s);
 
         fw3_xt_set_match_name(m);
 
         m->m->u.user.revision = m->revision;
         m->m->u.match_size = s;
 
         /* free previous userspace data */
         fw3_xt_free_match_udata(m);
 
         if (m->init)
                 m->init(m->m);
 
         /* don't merge options if no_clone is set and this match is a clone */
         if (no_clone && (m == m->next))
                 return;
 
         /* merge option table */
         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
         fw3_xt_merge_match_options(g, m);
 }
 
 static bool
 need_protomatch(struct fw3_ipt_rule *r, const char *pname)
 {
         if (!pname)
                 return false;
 
         if (!xtables_find_match(pname, XTF_DONT_LOAD, NULL))
                 return true;
 
         return !r->protocol_loaded;
 }
 
 static struct xtables_match *
 load_protomatch(struct fw3_ipt_rule *r)
 {
         const char *pname = get_protoname(r);
 
         if (!need_protomatch(r, pname))
                 return NULL;
 
         return find_match(r, pname);
 }
 
 static struct xtables_target *
 find_target(struct fw3_ipt_rule *r, const char *name)
 {
         struct xtables_target *t;
 
         xext.retain = true;
 
         if (is_chain(r->h, name))
                 t = xtables_find_target(XT_STANDARD_TARGET, XTF_TRY_LOAD);
         else
                 t = xtables_find_target(name, XTF_TRY_LOAD);
 
         xext.retain = false;
 
         return t;
 }
 
 static struct xtables_target *
 get_target(struct fw3_ipt_rule *r, const char *name)
 {
         size_t s;
         struct xtables_target *t;
         struct xtables_globals *g;
 
         t = find_target(r, name);
 
         if (!t)
                 return NULL;
 
         s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
         t->t = fw3_alloc(s);
 
         fw3_xt_set_target_name(t, name);
 
         t->t->u.user.revision = t->revision;
         t->t->u.target_size = s;
 
         /* free previous userspace data */
         fw3_xt_free_target_udata(t);
 
         if (t->init)
                 t->init(t->t);
 
         /* merge option table */
         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
         fw3_xt_merge_target_options(g, t);
 
         r->target = t;
 
         return t;
 }
 
 void
 fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto)
 {
         uint32_t pr;
 
         if (!proto || proto->any)
                 return;
 
         pr = proto->protocol;
 
 #ifndef DISABLE_IPV6
         if (r->h->family == FW3_FAMILY_V6)
         {
                 if (pr == 1)
                         pr = 58;
 
                 r->e6.ipv6.proto = pr;
                 r->e6.ipv6.flags |= IP6T_F_PROTO;
 
                 if (proto->invert)
                         r->e6.ipv6.invflags |= XT_INV_PROTO;
         }
         else
 #endif
         {
                 r->e.ip.proto = pr;
 
                 if (proto->invert)
                         r->e.ip.invflags |= XT_INV_PROTO;
         }
 
         r->protocol = pr;
 }
 
 void
 fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
                     struct fw3_device *in, struct fw3_device *out)
 {
 #ifndef DISABLE_IPV6
         if (r->h->family == FW3_FAMILY_V6)
         {
                 if (in && !in->any)
                 {
                         xtables_parse_interface(in->name, r->e6.ipv6.iniface,
                                                           r->e6.ipv6.iniface_mask);
 
                         if (in->invert)
                                 r->e6.ipv6.invflags |= IP6T_INV_VIA_IN;
                 }
 
                 if (out && !out->any)
                 {
                         xtables_parse_interface(out->name, r->e6.ipv6.outiface,
                                                            r->e6.ipv6.outiface_mask);
 
                         if (out->invert)
                                 r->e6.ipv6.invflags |= IP6T_INV_VIA_OUT;
                 }
         }
         else
 #endif
         {
                 if (in && !in->any)
                 {
                         xtables_parse_interface(in->name, r->e.ip.iniface,
                                                           r->e.ip.iniface_mask);
 
                         if (in->invert)
                                 r->e.ip.invflags |= IPT_INV_VIA_IN;
                 }
 
                 if (out && !out->any)
                 {
                         xtables_parse_interface(out->name, r->e.ip.outiface,
                                                            r->e.ip.outiface_mask);
 
                         if (out->invert)
                                 r->e.ip.invflags |= IPT_INV_VIA_OUT;
                 }
         }
 }
 
 
 void
 fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
                       struct fw3_address *src, struct fw3_address *dest)
 {
         if ((src && src->range) || (dest && dest->range))
         {
                 fw3_ipt_rule_addarg(r, false, "-m", "iprange");
         }
 
         if (src && src->set)
         {
                 if (src->range)
                 {
                         fw3_ipt_rule_addarg(r, src->invert, "--src-range",
                                             fw3_address_to_string(src, false, false));
                 }
 #ifndef DISABLE_IPV6
                 else if (r->h->family == FW3_FAMILY_V6)
                 {
                         r->e6.ipv6.src = src->address.v6;
                         r->e6.ipv6.smsk = src->mask.v6;
 
                         int i;
                         for (i = 0; i < 4; i++)
                                 r->e6.ipv6.src.s6_addr32[i] &= r->e6.ipv6.smsk.s6_addr32[i];
 
                         if (src->invert)
                                 r->e6.ipv6.invflags |= IP6T_INV_SRCIP;
                 }
 #endif
                 else
                 {
                         r->e.ip.src = src->address.v4;
                         r->e.ip.smsk = src->mask.v4;
 
                         r->e.ip.src.s_addr &= r->e.ip.smsk.s_addr;
 
                         if (src->invert)
                                 r->e.ip.invflags |= IPT_INV_SRCIP;
                 }
         }
 
         if (dest && dest->set)
         {
                 if (dest->range)
                 {
                         fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
                                             fw3_address_to_string(dest, false, false));
                 }
 #ifndef DISABLE_IPV6
                 else if (r->h->family == FW3_FAMILY_V6)
                 {
                         r->e6.ipv6.dst = dest->address.v6;
                         r->e6.ipv6.dmsk = dest->mask.v6;
 
                         int i;
                         for (i = 0; i < 4; i++)
                                 r->e6.ipv6.dst.s6_addr32[i] &= r->e6.ipv6.dmsk.s6_addr32[i];
 
                         if (dest->invert)
                                 r->e6.ipv6.invflags |= IP6T_INV_DSTIP;
                 }
 #endif
                 else
                 {
                         r->e.ip.dst = dest->address.v4;
                         r->e.ip.dmsk = dest->mask.v4;
 
                         r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
 
                         if (dest->invert)
                                 r->e.ip.invflags |= IPT_INV_DSTIP;
                 }
         }
 }
 
 void
 fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
                          struct fw3_port *sp, struct fw3_port *dp)
 {
         char buf[sizeof("65535:65535\0")];
 
         if ((!sp || !sp->set) && (!dp || !dp->set))
                 return;
 
         if (!get_protoname(r))
                 return;
 
         if (sp && sp->set)
         {
                 if (sp->port_min == sp->port_max)
                         sprintf(buf, "%u", sp->port_min);
                 else
                         snprintf(buf, sizeof(buf), "%u:%u", sp->port_min, sp->port_max);
 
                 fw3_ipt_rule_addarg(r, sp->invert, "--sport", buf);
         }
 
         if (dp && dp->set)
         {
                 if (dp->port_min == dp->port_max)
                         sprintf(buf, "%u", dp->port_min);
                 else
                         snprintf(buf, sizeof(buf), "%u:%u", dp->port_min, dp->port_max);
 
                 fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
         }
 }
 
 void
 fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out)
 {
         if (device) {
                 struct fw3_device dev = { .any = false };
                 strncpy(dev.name, device, sizeof(dev.name) - 1);
                 fw3_ipt_rule_in_out(r, (out) ? NULL : &dev, (out) ? &dev : NULL);
         }
 }
 
 void
 fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
 {
         char buf[sizeof("ff:ff:ff:ff:ff:ff\0")];
         uint8_t *addr = mac->mac.ether_addr_octet;
 
         if (!mac)
                 return;
 
         sprintf(buf, "%02x:%02x:%02x:%02x:%02x:%02x",
                 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 
         fw3_ipt_rule_addarg(r, false, "-m", "mac");
         fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", buf);
 }
 
 void
 fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
 {
         char buf[sizeof("255/255\0")];
 
         if (!icmp)
                 return;
 
 #ifndef DISABLE_IPV6
         if (r->h->family == FW3_FAMILY_V6)
         {
                 if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
                         sprintf(buf, "%u", icmp->type6);
                 else
                         snprintf(buf, sizeof(buf), "%u/%u", icmp->type6, icmp->code6_min);
 
                 fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
         }
         else
 #endif
         {
                 if (icmp->code_min == 0 && icmp->code_max == 0xFF)
                         sprintf(buf, "%u", icmp->type);
                 else
                         snprintf(buf, sizeof(buf), "%u/%u", icmp->type, icmp->code_min);
 
                 fw3_ipt_rule_addarg(r, icmp->invert, "--icmp-type", buf);
         }
 }
 
 void
 fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit)
 {
         char buf[sizeof("-4294967296/second\0")];
 
         if (!limit || limit->rate <= 0)
                 return;
 
         fw3_ipt_rule_addarg(r, false, "-m", "limit");
 
         sprintf(buf, "%u/%s", limit->rate, fw3_limit_units[limit->unit]);
         fw3_ipt_rule_addarg(r, limit->invert, "--limit", buf);
 
         if (limit->burst > 0)
         {
                 sprintf(buf, "%u", limit->burst);
                 fw3_ipt_rule_addarg(r, limit->invert, "--limit-burst", buf);
         }
 }
 
 void
 fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match)
 {
         char buf[sizeof("dst,dst,dst\0")];
         char *p = buf;
         int i = 0;
 
         struct fw3_ipset *set;
         struct fw3_ipset_datatype *type;
 
         if (!match || !match->set || !match->ptr)
                 return;
 
         set = match->ptr;
         list_for_each_entry(type, &set->datatypes, list)
         {
                 if (i >= 3)
                         break;
 
                 if (p > buf)
                         *p++ = ',';
 
                 p += sprintf(p, "%s", match->dir[i] ? match->dir[i] : type->dir);
                 i++;
         }
 
         fw3_ipt_rule_addarg(r, false, "-m", "set");
 
         fw3_ipt_rule_addarg(r, match->invert, "--match-set",
                             set->external ? set->external : set->name);
 
         fw3_ipt_rule_addarg(r, false, buf, NULL);
 }
 
 void
 fw3_ipt_rule_helper(struct fw3_ipt_rule *r, struct fw3_cthelpermatch *match)
 {
         if (!match || !match->set || !match->ptr)
                 return;
 
         fw3_ipt_rule_addarg(r, false, "-m", "helper");
         fw3_ipt_rule_addarg(r, match->invert, "--helper", match->ptr->name);
 }
 
 void
 fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time)
 {
         int i;
         struct tm empty = { 0 };
 
         char buf[84]; /* sizeof("1,2,3,...,30,31\0") */
         char *p;
 
         bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
         bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
 
         if (!d1 && !d2 && !time->timestart && !time->timestop &&
             !(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
         {
                 return;
         }
 
         fw3_ipt_rule_addarg(r, false, "-m", "time");
 
         if (!time->utc)
                 fw3_ipt_rule_addarg(r, false, "--kerneltz", NULL);
 
         if (d1)
         {
                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestart);
                 fw3_ipt_rule_addarg(r, false, "--datestart", buf);
         }
 
         if (d2)
         {
                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestop);
                 fw3_ipt_rule_addarg(r, false, "--datestop", buf);
         }
 
         if (time->timestart)
         {
                 sprintf(buf, "%02d:%02d:%02d",
                         time->timestart / 3600,
                         time->timestart % 3600 / 60,
                         time->timestart % 60);
 
                 fw3_ipt_rule_addarg(r, false, "--timestart", buf);
         }
 
         if (time->timestop)
         {
                 sprintf(buf, "%02d:%02d:%02d",
                         time->timestop / 3600,
                         time->timestop % 3600 / 60,
                         time->timestop % 60);
 
                 fw3_ipt_rule_addarg(r, false, "--timestop", buf);
         }
 
         if (time->monthdays & 0xFFFFFFFE)
         {
                 for (i = 1, p = buf; i < 32; i++)
                 {
                         if (fw3_hasbit(time->monthdays, i))
                         {
                                 if (p > buf)
                                         *p++ = ',';
 
                                 p += sprintf(p, "%u", i);
                         }
                 }
 
                 fw3_ipt_rule_addarg(r, fw3_hasbit(time->monthdays, 0), "--monthdays", buf);
         }
 
         if (time->weekdays & 0xFE)
         {
                 for (i = 1, p = buf; i < 8; i++)
                 {
                         if (fw3_hasbit(time->weekdays, i))
                         {
                                 if (p > buf)
                                         *p++ = ',';
 
                                 p += sprintf(p, "%u", i);
                         }
                 }
 
                 fw3_ipt_rule_addarg(r, fw3_hasbit(time->weekdays, 0), "--weekdays", buf);
         }
 }
 
 void
 fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark)
 {
         char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF\0")];
 
         if (!mark || !mark->set)
                 return;
 
         if (mark->mask < 0xFFFFFFFF)
                 sprintf(buf, "0x%x/0x%x", mark->mark, mark->mask);
         else
                 sprintf(buf, "0x%x", mark->mark);
 
         fw3_ipt_rule_addarg(r, false, "-m", "mark");
         fw3_ipt_rule_addarg(r, mark->invert, "--mark", buf);
 }
 
 void
 fw3_ipt_rule_dscp(struct fw3_ipt_rule *r, struct fw3_dscp *dscp)
 {
         char buf[sizeof("0xFF\0")];
 
         if (!dscp || !dscp->set)
                 return;
 
         sprintf(buf, "0x%x", dscp->dscp);
 
         fw3_ipt_rule_addarg(r, false, "-m", "dscp");
         fw3_ipt_rule_addarg(r, dscp->invert, "--dscp", buf);
 }
 
 void
 fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...)
 {
         va_list ap;
         char buf[256];
 
         if (!fmt || !*fmt)
                 return;
 
         va_start(ap, fmt);
         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
         va_end(ap);
 
         fw3_ipt_rule_addarg(r, false, "-m", "comment");
         fw3_ipt_rule_addarg(r, false, "--comment", buf);
 }
 
 void
 fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra)
 {
         char *p, **tmp, *s;
 
         if (!extra || !*extra)
                 return;
 
         s = fw3_strdup(extra);
 
         for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
         {
                 tmp = realloc(r->argv, (r->argc + 1) * sizeof(*r->argv));
 
                 if (!tmp)
                         break;
 
                 r->argv = tmp;
                 r->argv[r->argc++] = fw3_strdup(p);
         }
 
         free(s);
 }
 
 #ifndef DISABLE_IPV6
 static void
 rule_print6(struct ip6t_entry *e)
 {
         char buf1[INET6_ADDRSTRLEN], buf2[INET6_ADDRSTRLEN];
         char *pname;
 
         if (e->ipv6.flags & IP6T_F_PROTO)
         {
                 if (e->ipv6.invflags & XT_INV_PROTO)
                         printf(" !");
 
                 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e6));
 
                 if (pname)
                         printf(" -p %s", pname);
                 else
                         printf(" -p %u", e->ipv6.proto);
         }
 
         if (e->ipv6.iniface[0])
         {
                 if (e->ipv6.invflags & IP6T_INV_VIA_IN)
                         printf(" !");
 
                 printf(" -i %s", e->ipv6.iniface);
         }
 
         if (e->ipv6.outiface[0])
         {
                 if (e->ipv6.invflags & IP6T_INV_VIA_OUT)
                         printf(" !");
 
                 printf(" -o %s", e->ipv6.outiface);
         }
 
         if (memcmp(&e->ipv6.src, &in6addr_any, sizeof(struct in6_addr)))
         {
                 if (e->ipv6.invflags & IP6T_INV_SRCIP)
                         printf(" !");
 
                 printf(" -s %s/%s",
                        inet_ntop(AF_INET6, &e->ipv6.src, buf1, sizeof(buf1)),
                        inet_ntop(AF_INET6, &e->ipv6.smsk, buf2, sizeof(buf2)));
         }
 
         if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
         {
                 if (e->ipv6.invflags & IP6T_INV_DSTIP)
                         printf(" !");
 
                 printf(" -d %s/%s",
                        inet_ntop(AF_INET6, &e->ipv6.dst, buf1, sizeof(buf1)),
                        inet_ntop(AF_INET6, &e->ipv6.dmsk, buf2, sizeof(buf2)));
         }
 }
 #endif
 
 static void
 rule_print4(struct ipt_entry *e)
 {
         struct in_addr in_zero = { 0 };
         char buf1[sizeof("255.255.255.255\0")], buf2[sizeof("255.255.255.255\0")];
         char *pname;
 
         if (e->ip.proto)
         {
                 if (e->ip.invflags & XT_INV_PROTO)
                         printf(" !");
 
                 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e));
 
                 if (pname)
                         printf(" -p %s", pname);
                 else
                         printf(" -p %u", e->ip.proto);
         }
 
         if (e->ip.iniface[0])
         {
                 if (e->ip.invflags & IPT_INV_VIA_IN)
                         printf(" !");
 
                 printf(" -i %s", e->ip.iniface);
         }
 
         if (e->ip.outiface[0])
         {
                 if (e->ip.invflags & IPT_INV_VIA_OUT)
                         printf(" !");
 
                 printf(" -o %s", e->ip.outiface);
         }
 
         if (memcmp(&e->ip.src, &in_zero, sizeof(struct in_addr)))
         {
                 if (e->ip.invflags & IPT_INV_SRCIP)
                         printf(" !");
 
                 printf(" -s %s/%s",
                        inet_ntop(AF_INET, &e->ip.src, buf1, sizeof(buf1)),
                        inet_ntop(AF_INET, &e->ip.smsk, buf2, sizeof(buf2)));
         }
 
         if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
         {
                 if (e->ip.invflags & IPT_INV_DSTIP)
                         printf(" !");
 
                 printf(" -d %s/%s",
                        inet_ntop(AF_INET, &e->ip.dst, buf1, sizeof(buf1)),
                        inet_ntop(AF_INET, &e->ip.dmsk, buf2, sizeof(buf2)));
         }
 }
 
 static void
 rule_print(struct fw3_ipt_rule *r, const char *prefix, const char *chain)
 {
         debug(r->h, "%s %s", prefix, chain);
 
 #ifndef DISABLE_IPV6
         if (r->h->family == FW3_FAMILY_V6)
                 rule_print6(&r->e6);
         else
 #endif
                 rule_print4(&r->e);
 
         fw3_xt_print_matches(&r->e.ip, r->matches);
         fw3_xt_print_target(&r->e.ip, r->target);
 
         printf("\n");
 }
 
 static bool
 parse_option(struct fw3_ipt_rule *r, int optc, bool inv)
 {
         struct xtables_rule_match *m;
         struct xtables_match *em;
 
         /* is a target option */
         if (r->target && fw3_xt_has_target_parse(r->target) &&
                 optc >= r->target->option_offset &&
                 optc < (r->target->option_offset + 256))
         {
                 xtables_option_tpcall(optc, r->argv, inv, r->target, &r->e);
                 return false;
         }
 
         /* try to dispatch argument to one of the match parsers */
         for (m = r->matches; m; m = m->next)
         {
                 em = m->match;
 
                 if (m->completed || !fw3_xt_has_match_parse(em))
                         continue;
 
                 if (optc < em->option_offset ||
                         optc >= (em->option_offset + 256))
                         continue;
 
                 xtables_option_mpcall(optc, r->argv, inv, em, &r->e);
                 return false;
         }
 
         /* unhandled option, might belong to a protocol match */
         if ((em = load_protomatch(r)) != NULL)
         {
                 init_match(r, em, false);
 
                 r->protocol_loaded = true;
                 optind--;
 
                 return true;
         }
 
         if (optc == ':')
                 warn("parse_option(): option '%s' needs argument", r->argv[optind-1]);
 
         if (optc == '?')
                 warn("parse_option(): unknown option '%s'", r->argv[optind-1]);
 
         return false;
 }
 
 void
 fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
                     const char *k, const char *v)
 {
         int n;
         char **tmp;
 
         if (!k)
                 return;
 
         n = inv + !!k + !!v;
         tmp = realloc(r->argv, (r->argc + n) * sizeof(*tmp));
 
         if (!tmp)
                 return;
 
         r->argv = tmp;
 
         if (inv)
                 r->argv[r->argc++] = fw3_strdup("!");
 
         r->argv[r->argc++] = fw3_strdup(k);
 
         if (v)
                 r->argv[r->argc++] = fw3_strdup(v);
 }
 
 static unsigned char *
 rule_mask(struct fw3_ipt_rule *r)
 {
         size_t s;
         unsigned char *p, *mask = NULL;
         struct xtables_rule_match *m;
 
 #define SZ(x) XT_ALIGN(sizeof(struct x))
 
 #ifndef DISABLE_IPV6
         if (r->h->family == FW3_FAMILY_V6)
         {
                 s = SZ(ip6t_entry);
 
                 for (m = r->matches; m; m = m->next)
                         s += SZ(ip6t_entry_match) + m->match->size;
 
                 s += SZ(ip6t_entry_target);
                 if (r->target)
                         s += r->target->size;
 
                 mask = fw3_alloc(s);
                 memset(mask, 0xFF, SZ(ip6t_entry));
                 p = mask + SZ(ip6t_entry);
 
                 for (m = r->matches; m; m = m->next)
                 {
                         memset(p, 0xFF, SZ(ip6t_entry_match) + m->match->userspacesize);
                         p += SZ(ip6t_entry_match) + m->match->size;
                 }
 
                 memset(p, 0xFF, SZ(ip6t_entry_target) + (r->target ? r->target->userspacesize : 0));
         }
         else
 #endif
         {
                 s = SZ(ipt_entry);
 
                 for (m = r->matches; m; m = m->next)
                         s += SZ(ipt_entry_match) + m->match->size;
 
                 s += SZ(ipt_entry_target);
                 if (r->target)
                         s += r->target->size;
 
                 mask = fw3_alloc(s);
                 memset(mask, 0xFF, SZ(ipt_entry));
                 p = mask + SZ(ipt_entry);
 
                 for (m = r->matches; m; m = m->next)
                 {
                         memset(p, 0xFF, SZ(ipt_entry_match) + m->match->userspacesize);
                         p += SZ(ipt_entry_match) + m->match->size;
                 }
 
                 memset(p, 0xFF, SZ(ipt_entry_target) + (r->target ? r->target->userspacesize : 0));
         }
 
         return mask;
 }
 
 static void *
 rule_build(struct fw3_ipt_rule *r)
 {
         size_t s, target_size = (r->target) ? r->target->t->u.target_size : 0;
         struct xtables_rule_match *m;
 
 #ifndef DISABLE_IPV6
         if (r->h->family == FW3_FAMILY_V6)
         {
                 struct ip6t_entry *e6;
 
                 s = XT_ALIGN(sizeof(struct ip6t_entry));
 
                 for (m = r->matches; m; m = m->next)
                         s += m->match->m->u.match_size;
 
                 e6 = fw3_alloc(s + target_size);
 
                 memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
 
                 e6->target_offset = s;
                 e6->next_offset = s + target_size;
 
                 s = 0;
 
                 for (m = r->matches; m; m = m->next)
                 {
                         memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
                         s += m->match->m->u.match_size;
                 }
 
                 if (target_size)
                         memcpy(e6->elems + s, r->target->t, target_size);
 
                 return e6;
         }
         else
 #endif
         {
                 struct ipt_entry *e;
 
                 s = XT_ALIGN(sizeof(struct ipt_entry));
 
                 for (m = r->matches; m; m = m->next)
                         s += m->match->m->u.match_size;
 
                 e = fw3_alloc(s + target_size);
 
                 memcpy(e, &r->e, sizeof(struct ipt_entry));
 
                 e->target_offset = s;
                 e->next_offset = s + target_size;
 
                 s = 0;
 
                 for (m = r->matches; m; m = m->next)
                 {
                         memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
                         s += m->match->m->u.match_size;
                 }
 
                 if (target_size)
                         memcpy(e->elems + s, r->target->t, target_size);
 
                 return e;
         }
 }
 
 static void
 set_rule_tag(struct fw3_ipt_rule *r)
 {
         int i;
         char *p, **tmp;
         const char *tag = "!fw3";
 
         for (i = 0; i < r->argc; i++)
                 if (!strcmp(r->argv[i], "--comment") && (i + 1) < r->argc)
                         if (asprintf(&p, "%s: %s", tag, r->argv[i + 1]) > 0)
                         {
                                 free(r->argv[i + 1]);
                                 r->argv[i + 1] = p;
                                 return;
                         }
 
         tmp = realloc(r->argv, (r->argc + 4) * sizeof(*r->argv));
 
         if (tmp)
         {
                 r->argv = tmp;
                 r->argv[r->argc++] = fw3_strdup("-m");
                 r->argv[r->argc++] = fw3_strdup("comment");
                 r->argv[r->argc++] = fw3_strdup("--comment");
                 r->argv[r->argc++] = fw3_strdup(tag);
         }
 }
 
 void
 __fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl, const char *fmt, ...)
 {
         void *rule;
         unsigned char *mask;
 
         struct xtables_rule_match *m;
         struct xtables_match *em;
         struct xtables_target *et;
         struct xtables_globals *g;
 
         struct fw3_device dev;
         struct fw3_address addr;
 
         enum xtables_exittype status;
 
         int i, optc;
         bool inv = false;
         char buf[32];
         va_list ap;
 
         va_start(ap, fmt);
         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
         va_end(ap);
 
         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
         g->opts = g->orig_opts;
 
         optind = 0;
         opterr = 0;
 
         status = setjmp(fw3_ipt_error_jmp);
 
         if (status > 0)
         {
                 info("     ! Skipping due to previous exception (code %u)", status);
                 goto free;
         }
 
         set_rule_tag(r);
 
         while ((optc = getopt_long(r->argc, r->argv, "-:m:j:i:o:s:d:", g->opts,
                                    NULL)) != -1)
         {
                 switch (optc)
                 {
                 case 'm':
                         em = find_match(r, optarg);
 
                         if (!em)
                         {
                                 warn("fw3_ipt_rule_append(): Can't find match '%s'", optarg);
                                 goto free;
                         }
 
                         init_match(r, em, true);
                         break;
 
                 case 'j':
                         et = get_target(r, optarg);
 
                         if (!et)
                         {
                                 warn("fw3_ipt_rule_append(): Can't find target '%s'", optarg);
                                 goto free;
                         }
 
                         break;
 
                 case 'i':
                 case 'o':
                         if (!fw3_parse_device(&dev, optarg, false) ||
                             dev.any || dev.invert || *dev.network)
                         {
                                 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
                                 goto free;
                         }
 
                         dev.invert = inv;
                         fw3_ipt_rule_in_out(r, (optc == 'i') ? &dev : NULL,
                                                (optc == 'o') ? &dev : NULL);
                         break;
 
                 case 's':
                 case 'd':
                         if (!fw3_parse_address(&addr, optarg, false) ||
                             addr.range || addr.invert)
                         {
                                 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
                                 goto free;
                         }
 
                         addr.invert = inv;
                         fw3_ipt_rule_src_dest(r, (optc == 's') ? &addr : NULL,
                                                  (optc == 'd') ? &addr : NULL);
                         break;
 
                 case 1:
                         if ((optarg[0] == '!') && (optarg[1] == '\0'))
                         {
                                 optarg[0] = '\0';
                                 inv = true;
                                 continue;
                         }
 
                         warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
                         goto free;
 
                 default:
                         if (parse_option(r, optc, inv))
                                 continue;
                         break;
                 }
 
                 inv = false;
         }
 
         for (m = r->matches; m; m = m->next)
                 xtables_option_mfcall(m->match);
 
         if (r->target)
                 xtables_option_tfcall(r->target);
 
         rule = rule_build(r);
 
 #ifndef DISABLE_IPV6
         if (r->h->family == FW3_FAMILY_V6)
         {
                 if (repl)
                 {
                         mask = rule_mask(r);
 
                         while (ip6tc_delete_entry(buf, rule, mask, r->h->handle))
                                 if (fw3_pr_debug)
                                         rule_print(r, "-D", buf);
 
                         free(mask);
                 }
 
                 if (fw3_pr_debug)
                         rule_print(r, "-A", buf);
 
                 if (!ip6tc_append_entry(buf, rule, r->h->handle))
                         warn("ip6tc_append_entry(): %s", ip6tc_strerror(errno));
         }
         else
 #endif
         {
                 if (repl)
                 {
                         mask = rule_mask(r);
 
                         while (iptc_delete_entry(buf, rule, mask, r->h->handle))
                                 if (fw3_pr_debug)
                                         rule_print(r, "-D", buf);
 
                         free(mask);
                 }
 
                 if (fw3_pr_debug)
                         rule_print(r, "-A", buf);
 
                 if (!iptc_append_entry(buf, rule, r->h->handle))
                         warn("iptc_append_entry(): %s\n", iptc_strerror(errno));
         }
 
         free(rule);
 
 free:
         for (i = 1; i < r->argc; i++)
                 free(r->argv[i]);
 
         free(r->argv);
 
         xtables_rule_matches_free(&r->matches);
 
         if (r->target)
                 free(r->target->t);
 
         free(r);
 
         /* reset all targets and matches */
         for (em = xtables_matches; em; em = em->next)
                 em->mflags = 0;
 
         for (et = xtables_targets; et; et = et->next)
         {
                 et->tflags = 0;
                 et->used = 0;
         }
 
         xtables_free_opts(1);
 }
 
 struct fw3_ipt_rule *
 fw3_ipt_rule_create(struct fw3_ipt_handle *handle, struct fw3_protocol *proto,
                     struct fw3_device *in, struct fw3_device *out,
                     struct fw3_address *src, struct fw3_address *dest)
 {
         struct fw3_ipt_rule *r;
 
         r = fw3_ipt_rule_new(handle);
 
         fw3_ipt_rule_proto(r, proto);
         fw3_ipt_rule_in_out(r, in, out);
         fw3_ipt_rule_src_dest(r, src, dest);
 
         return r;
 }
 
 void
 xtables_register_match(struct xtables_match *me)
 {
         int i;
         static struct xtables_match **tmp;
 
         if (!xext.register_match)
                 xext.register_match = dlsym(RTLD_NEXT, "xtables_register_match");
 
         if (!xext.register_match)
                 return;
 
         xext.register_match(me);
 
         if (xext.retain)
         {
                 for (i = 0; i < xext.mcount; i++)
                         if (xext.matches[i] == me)
                                 return;
 
                 tmp = realloc(xext.matches, sizeof(me) * (xext.mcount + 1));
 
                 if (!tmp)
                         return;
 
                 xext.matches = tmp;
                 xext.matches[xext.mcount++] = me;
         }
 }
 
 void
 xtables_register_target(struct xtables_target *me)
 {
         int i;
         static struct xtables_target **tmp;
 
         if (!xext.register_target)
                 xext.register_target = dlsym(RTLD_NEXT, "xtables_register_target");
 
         if (!xext.register_target)
                 return;
 
         xext.register_target(me);
 
         if (xext.retain)
         {
                 for (i = 0; i < xext.tcount; i++)
                         if (xext.targets[i] == me)
                                 return;
 
                 tmp = realloc(xext.targets, sizeof(me) * (xext.tcount + 1));
 
                 if (!tmp)
                         return;
 
                 xext.targets = tmp;
                 xext.targets[xext.tcount++] = me;
         }
 }
 

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