#include "iptables.h"
+static struct option base_opts[] = {
+ { .name = "match", .has_arg = 1, .val = 'm' },
+ { .name = "jump", .has_arg = 1, .val = 'j' },
+ { .name = "append", .has_arg = 1, .val = 'A' },
+ { NULL }
+};
+
+static struct xtables_globals xtg = {
+ .option_offset = 0,
+ .program_version = "4",
+ .orig_opts = base_opts,
+};
+
+static struct xtables_globals xtg6 = {
+ .option_offset = 0,
+ .program_version = "6",
+ .orig_opts = base_opts,
+};
+
+/* Required by certain extensions like SNAT and DNAT */
+int kernel_version;
+
+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 = LINUX_VERSION(x, y, z);
+}
+
struct fw3_ipt_handle *
fw3_ipt_open(enum fw3_family family, enum fw3_table table)
{
struct fw3_ipt_handle *h;
- h = malloc(sizeof(*h));
+ h = fw3_alloc(sizeof(*h));
- if (!h)
- return NULL;
+ xtables_init();
if (family == FW3_FAMILY_V6)
{
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);
}
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)
return NULL;
}
+ xtables_pending_matches = NULL;
+ xtables_pending_targets = NULL;
+
+ xtables_matches = NULL;
+ xtables_targets = NULL;
+
+ init_extensions();
+ init_extensions4();
+ init_extensions6();
+
return h;
}
-void fw3_ipt_set_policy(struct fw3_ipt_handle *h, enum fw3_flag policy)
+void
+fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
+ enum fw3_flag policy)
{
- if (h->table != FW3_TABLE_FILTER)
- return;
-
if (h->family == FW3_FAMILY_V6)
- {
- ip6tc_set_policy("INPUT", fw3_flag_names[policy], NULL, h->handle);
- ip6tc_set_policy("OUTPUT", fw3_flag_names[policy], NULL, h->handle);
- ip6tc_set_policy("FORWARD", fw3_flag_names[policy], NULL, h->handle);
- }
+ ip6tc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
else
- {
- iptc_set_policy("INPUT", fw3_flag_names[policy], NULL, h->handle);
- iptc_set_policy("OUTPUT", fw3_flag_names[policy], NULL, h->handle);
- iptc_set_policy("FORWARD", fw3_flag_names[policy], NULL, h->handle);
- }
+ iptc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
}
-void fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
+void
+fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
{
+ if (fw3_pr_debug)
+ {
+ printf("-F %s\n", chain);
+ printf("-X %s\n", chain);
+ }
+
if (h->family == FW3_FAMILY_V6)
{
if (ip6tc_flush_entries(chain, h->handle))
}
}
-void fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target)
+void
+fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target)
{
unsigned int num;
const struct ipt_entry *e;
if (*t && !strcmp(t, target))
{
+ if (fw3_pr_debug)
+ printf("-D %s %u\n", chain, num + 1);
+
ip6tc_delete_num_entry(chain, num, h->handle);
found = true;
break;
if (*t && !strcmp(t, target))
{
+ if (fw3_pr_debug)
+ printf("-D %s %u\n", chain, num + 1);
+
iptc_delete_num_entry(chain, num, h->handle);
found = true;
break;
}
}
-void fw3_ipt_flush(struct fw3_ipt_handle *h)
+void
+fw3_ipt_flush(struct fw3_ipt_handle *h)
{
const char *chain;
}
}
-void fw3_ipt_commit(struct fw3_ipt_handle *h)
+void
+fw3_ipt_commit(struct fw3_ipt_handle *h)
{
+ int rv;
+
if (h->family == FW3_FAMILY_V6)
- ip6tc_commit(h->handle);
+ {
+ rv = ip6tc_commit(h->handle);
+ if (!rv)
+ fprintf(stderr, "ip6tc_commit(): %s\n", ip6tc_strerror(errno));
+ }
else
- iptc_commit(h->handle);
+ {
+ rv = iptc_commit(h->handle);
+ if (!rv)
+ fprintf(stderr, "iptc_commit(): %s\n", iptc_strerror(errno));
+ }
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)
+{
+ if (h->family == FW3_FAMILY_V6)
+ return ip6tc_is_chain(name, h->handle);
+ else
+ 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)
+{
+ return xtables_find_match(name, XTF_TRY_LOAD, &r->matches);
+}
+
+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);
+ strcpy(m->m->u.user.name, m->real_name ? m->real_name : m->name);
+ m->m->u.user.revision = m->revision;
+ m->m->u.match_size = s;
+
+ /* free previous userspace data */
+ if (m->udata_size)
+ {
+ free(m->udata);
+ m->udata = fw3_alloc(m->udata_size);
+ }
+
+ 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;
+
+ if (m->x6_options)
+ g->opts = xtables_options_xfrm(g->orig_opts, g->opts,
+ m->x6_options, &m->option_offset);
+
+ if (m->extra_opts)
+ g->opts = xtables_merge_options(g->orig_opts, g->opts,
+ m->extra_opts, &m->option_offset);
+}
+
+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 *
+get_target(struct fw3_ipt_rule *r, const char *name)
+{
+ size_t s;
+ struct xtables_target *t;
+ struct xtables_globals *g;
+
+ bool chain = is_chain(r->h, name);
+
+ if (chain)
+ t = xtables_find_target(XT_STANDARD_TARGET, XTF_LOAD_MUST_SUCCEED);
+ else
+ t = xtables_find_target(name, XTF_TRY_LOAD);
+
+ if (!t)
+ return NULL;
+
+ s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
+ t->t = fw3_alloc(s);
+
+ if (!t->real_name)
+ strcpy(t->t->u.user.name, name);
+ else
+ strcpy(t->t->u.user.name, t->real_name);
+
+ t->t->u.user.revision = t->revision;
+ t->t->u.target_size = s;
+
+ if (t->udata_size)
+ {
+ free(t->udata);
+ t->udata = fw3_alloc(t->udata_size);
+ }
+
+ if (t->init)
+ t->init(t->t);
+
+ /* merge option table */
+ g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
+
+ if (t->x6_options)
+ g->opts = xtables_options_xfrm(g->orig_opts, g->opts,
+ t->x6_options, &t->option_offset);
+ else
+ g->opts = xtables_merge_options(g->orig_opts, g->opts,
+ t->extra_opts, &t->option_offset);
+
+ 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;
+
+ 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
+ {
+ 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)
+{
+ 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
+ {
+ 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;
+ }
+ }
+}
+
+
+static void
+ip4prefix2mask(int prefix, struct in_addr *mask)
+{
+ mask->s_addr = htonl(~((1 << (32 - prefix)) - 1));
+}
+
+static void
+ip6prefix2mask(int prefix, struct in6_addr *mask)
+{
+ char *p = (char *)mask;
+
+ if (prefix > 0)
+ {
+ memset(p, 0xff, prefix / 8);
+ memset(p + (prefix / 8) + 1, 0, (128 - prefix) / 8);
+ p[prefix / 8] = 0xff << (8 - (prefix & 7));
+ }
+ else
+ {
+ memset(mask, 0, sizeof(*mask));
+ }
+}
+
+void
+fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
+ struct fw3_address *src, struct fw3_address *dest)
+{
+ int i;
+
+ 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));
+ }
+ else if (r->h->family == FW3_FAMILY_V6)
+ {
+ r->e6.ipv6.src = src->address.v6;
+ ip6prefix2mask(src->mask, &r->e6.ipv6.smsk);
+
+ 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;
+ }
+ else
+ {
+ r->e.ip.src = src->address.v4;
+ ip4prefix2mask(src->mask, &r->e.ip.smsk);
+
+ 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));
+ }
+ else if (r->h->family == FW3_FAMILY_V6)
+ {
+ r->e6.ipv6.dst = dest->address.v6;
+ ip6prefix2mask(dest->mask, &r->e6.ipv6.dmsk);
+
+ 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;
+ }
+ else
+ {
+ r->e.ip.dst = dest->address.v4;
+ ip4prefix2mask(dest->mask, &r->e.ip.dmsk);
+
+ 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
+ sprintf(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
+ sprintf(buf, "%u:%u", dp->port_min, dp->port_max);
+
+ fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
+ }
+}
+
+void
+fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
+{
+ if (!mac)
+ return;
+
+ fw3_ipt_rule_addarg(r, false, "-m", "mac");
+ fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", ether_ntoa(&mac->mac));
+}
+
+void
+fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
+{
+ char buf[sizeof("255/255\0")];
+
+ if (!icmp)
+ return;
+
+ if (r->h->family == FW3_FAMILY_V6)
+ {
+ if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
+ sprintf(buf, "%u", icmp->type6);
+ else
+ sprintf(buf, "%u/%u", icmp->type6, icmp->code6_min);
+
+ fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
+ }
+ else
+ {
+ if (icmp->code_min == 0 && icmp->code_max == 0xFF)
+ sprintf(buf, "%u", icmp->type);
+ else
+ sprintf(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_ipset *ipset,
+ bool invert)
+{
+ char buf[sizeof("dst,dst,dst\0")];
+ char *p = buf;
+
+ struct fw3_ipset_datatype *type;
+
+ if (!ipset)
+ return;
+
+ list_for_each_entry(type, &ipset->datatypes, list)
+ {
+ if (p > buf)
+ *p++ = ',';
+
+ p += sprintf(p, "%s", type->dest ? "dst" : "src");
+ }
+
+ fw3_ipt_rule_addarg(r, false, "-m", "set");
+
+ fw3_ipt_rule_addarg(r, invert, "--match-set",
+ ipset->external ? ipset->external : ipset->name);
+
+ fw3_ipt_rule_addarg(r, false, buf, NULL);
+}
+
+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, "--utc", 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 (hasbit(time->monthdays, i))
+ {
+ if (p > buf)
+ *p++ = ',';
+
+ p += sprintf(p, "%u", i);
+ }
+ }
+
+ fw3_ipt_rule_addarg(r, hasbit(time->monthdays, 0), "--monthdays", buf);
+ }
+
+ if (time->weekdays & 0xFE)
+ {
+ for (i = 1, p = buf; i < 8; i++)
+ {
+ if (hasbit(time->weekdays, i))
+ {
+ if (p > buf)
+ *p++ = ',';
+
+ p += sprintf(p, "%u", i);
+ }
+ }
+
+ fw3_ipt_rule_addarg(r, 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_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);
+}
+
+static void
+rule_print6(struct ip6t_entry *e)
+{
+ char buf[INET6_ADDRSTRLEN];
+ char *pname;
+
+ if (e->ipv6.flags & IP6T_F_PROTO)
+ {
+ if (e->ipv6.flags & 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.flags & IP6T_INV_VIA_IN)
+ printf(" !");
+
+ printf(" -i %s", e->ipv6.iniface);
+ }
+
+ if (e->ipv6.outiface[0])
+ {
+ if (e->ipv6.flags & 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.flags & IP6T_INV_SRCIP)
+ printf(" !");
+
+ printf(" -s %s/%u", inet_ntop(AF_INET6, &e->ipv6.src, buf, sizeof(buf)),
+ xtables_ip6mask_to_cidr(&e->ipv6.smsk));
+ }
+
+ if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
+ {
+ if (e->ipv6.flags & IP6T_INV_DSTIP)
+ printf(" !");
+
+ printf(" -d %s/%u", inet_ntop(AF_INET6, &e->ipv6.dst, buf, sizeof(buf)),
+ xtables_ip6mask_to_cidr(&e->ipv6.dmsk));
+ }
+}
+
+static void
+rule_print4(struct ipt_entry *e)
+{
+ struct in_addr in_zero = { 0 };
+ char buf[sizeof("255.255.255.255\0")];
+ char *pname;
+
+ if (e->ip.proto)
+ {
+ if (e->ip.flags & 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.flags & IPT_INV_VIA_IN)
+ printf(" !");
+
+ printf(" -i %s", e->ip.iniface);
+ }
+
+ if (e->ip.outiface[0])
+ {
+ if (e->ip.flags & 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.flags & IPT_INV_SRCIP)
+ printf(" !");
+
+ printf(" -s %s/%u", inet_ntop(AF_INET, &e->ip.src, buf, sizeof(buf)),
+ xtables_ipmask_to_cidr(&e->ip.smsk));
+ }
+
+ if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
+ {
+ if (e->ip.flags & IPT_INV_DSTIP)
+ printf(" !");
+
+ printf(" -d %s/%u", inet_ntop(AF_INET, &e->ip.dst, buf, sizeof(buf)),
+ xtables_ipmask_to_cidr(&e->ip.dmsk));
+ }
+}
+
+static void
+rule_print(struct fw3_ipt_rule *r, const char *chain)
+{
+ struct xtables_rule_match *rm;
+ struct xtables_match *m;
+ struct xtables_target *t;
+
+ printf("-A %s", chain);
+
+ if (r->h->family == FW3_FAMILY_V6)
+ rule_print6(&r->e6);
+ else
+ rule_print4(&r->e);
+
+ for (rm = r->matches; rm; rm = rm->next)
+ {
+ m = rm->match;
+ printf(" -m %s", m->alias ? m->alias(m->m) : m->m->u.user.name);
+
+ if (m->save)
+ m->save(&r->e.ip, m->m);
+ }
+
+ if (r->target)
+ {
+ t = r->target;
+ printf(" -j %s", t->alias ? t->alias(t->t) : t->t->u.user.name);
+
+ if (t->save)
+ t->save(&r->e.ip, t->t);
+ }
+
+ 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 && (r->target->parse || r->target->x6_parse) &&
+ 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 || (!em->parse && !em->x6_parse))
+ 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 == ':')
+ fprintf(stderr, "parse_option(): option '%s' needs argument\n",
+ r->argv[optind-1]);
+
+ if (optc == '?')
+ fprintf(stderr, "parse_option(): unknown option '%s'\n",
+ 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);
+}
+
+void
+fw3_ipt_rule_append(struct fw3_ipt_rule *r, const char *fmt, ...)
+{
+ size_t s;
+ struct xtables_rule_match *m;
+ struct xtables_match *em;
+ struct xtables_target *et;
+ struct xtables_globals *g;
+ struct ipt_entry *e;
+ struct ip6t_entry *e6;
+
+ 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;
+
+ while ((optc = getopt_long(r->argc, r->argv, "m:j:", g->opts, NULL)) != -1)
+ {
+ switch (optc)
+ {
+ case 'm':
+ em = find_match(r, optarg);
+
+ if (!em)
+ {
+ fprintf(stderr, "fw3_ipt_rule_append(): Can't find match '%s'\n", optarg);
+ return;
+ }
+
+ init_match(r, em, true);
+ break;
+
+ case 'j':
+ et = get_target(r, optarg);
+
+ if (!et)
+ {
+ fprintf(stderr, "fw3_ipt_rule_append(): Can't find target '%s'\n", optarg);
+ return;
+ }
+
+ break;
+
+ case 1:
+ if ((optarg[0] == '!') && (optarg[1] == '\0'))
+ {
+ inv = true;
+ continue;
+ }
+
+ fprintf(stderr, "fw3_ipt_rule_append(): Bad argument '%s'\n", optarg);
+ return;
+
+ 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);
+
+ if (fw3_pr_debug)
+ rule_print(r, buf);
+
+ if (r->h->family == FW3_FAMILY_V6)
+ {
+ 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 + r->target->t->u.target_size);
+
+ memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
+
+ e6->target_offset = s;
+ e6->next_offset = s + r->target->t->u.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;
+ }
+
+ memcpy(e6->elems + s, r->target->t, r->target->t->u.target_size);
+ ip6tc_append_entry(buf, e6, r->h->handle);
+ free(e6);
+ }
+ else
+ {
+ 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 + r->target->t->u.target_size);
+
+ memcpy(e, &r->e, sizeof(struct ipt_entry));
+
+ e->target_offset = s;
+ e->next_offset = s + r->target->t->u.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;
+ }
+
+ memcpy(e->elems + s, r->target->t, r->target->t->u.target_size);
+
+ if (!iptc_append_entry(buf, e, r->h->handle))
+ fprintf(stderr, "iptc_append_entry(): %s\n", iptc_strerror(errno));
+
+ free(e);
+ }
+
+ for (i = 1; i < r->argc; i++)
+ free(r->argv[i]);
+
+ free(r->argv);
+
+ xtables_rule_matches_free(&r->matches);
+
+ 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;
+}
projects / project / firewall3.git / blobdiff