#include <libiptc/libip6tc.h>
#include <xtables.h>
+#include <setjmp.h>
+
#include "options.h"
/* xtables interface */
#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;
};
static struct option base_opts[] = {
- { .name = "match", .has_arg = 1, .val = 'm' },
- { .name = "jump", .has_arg = 1, .val = 'j' },
+ { .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
.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
get_kernel_version(void)
{
static struct utsname uts;
- int x = 0, y = 0, z = 0;
+ int x = 3, y = 0, z = 0;
- if (uname(&uts) == -1)
- sprintf(uts.release, "3.0.0");
+ if (uname(&uts) != -1)
+ sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
- sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
kernel_version = 0x10000 * x + 0x100 * y + z;
}
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
if (!h->handle)
{
free(h);
+ fw3_unlock_path(&xt_lock_fd, XT_LOCK_NAME);
return NULL;
}
}
}
+static bool
+is_referenced(struct fw3_ipt_handle *h, const char *target)
+{
+ const struct ipt_entry *e;
+ const char *chain;
+ const char *t;
+
+#ifndef DISABLE_IPV6
+ if (h->family == FW3_FAMILY_V6)
+ {
+ for (chain = ip6tc_first_chain(h->handle);
+ chain != NULL;
+ chain = ip6tc_next_chain(h->handle))
+ {
+ const struct ip6t_entry *e6;
+ for (e6 = ip6tc_first_rule(chain, h->handle);
+ e6 != NULL;
+ e6 = ip6tc_next_rule(e6, h->handle))
+ {
+ t = ip6tc_get_target(e6, h->handle);
+
+ if (*t && !strcmp(t, target))
+ return true;
+ }
+ }
+ }
+ else
+#endif
+ {
+ for (chain = iptc_first_chain(h->handle);
+ chain != NULL;
+ chain = iptc_next_chain(h->handle))
+ {
+ for (e = iptc_first_rule(chain, h->handle);
+ e != NULL;
+ e = iptc_next_rule(e, h->handle))
+ {
+ t = iptc_get_target(e, h->handle);
+
+ if (*t && !strcmp(t, target))
+ return true;
+ }
+ }
+ }
+
+ return false;
+}
+
void
-fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
+fw3_ipt_delete_chain(struct fw3_ipt_handle *h, bool if_unused,
+ const char *chain)
{
+ if (if_unused && is_referenced(h, chain))
+ return;
+
delete_rules(h, chain);
if (fw3_pr_debug)
}
}
-void
-fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...)
+
+static bool
+is_chain(struct fw3_ipt_handle *h, const char *name)
{
- char buf[32];
- va_list ap;
+#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);
+}
- va_start(ap, fmt);
- vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
- va_end(ap);
+void
+fw3_ipt_create_chain(struct fw3_ipt_handle *h, bool ignore_existing,
+ const char *chain)
+{
+ if (ignore_existing && is_chain(h, chain))
+ return;
if (fw3_pr_debug)
- debug(h, "-N %s\n", buf);
+ debug(h, "-N %s\n", chain);
- iptc_create_chain(buf, h->handle);
+ iptc_create_chain(chain, h->handle);
}
void
if (!chain_is_empty(h, chain))
continue;
- fw3_ipt_delete_chain(h, chain);
+ fw3_ipt_delete_chain(h, false, chain);
found = true;
break;
}
warn("D=%s\n", chain);
- fw3_ipt_delete_chain(h, chain);
+ fw3_ipt_delete_chain(h, false, chain);
found = true;
break;
}
void
fw3_ipt_close(struct fw3_ipt_handle *h)
{
+ fw3_unlock_path(&xt_lock_fd, XT_LOCK_NAME);
free(h);
}
}
-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)
{
static bool
need_protomatch(struct fw3_ipt_rule *r, const char *pname)
{
+ struct xtables_match *match;
+
if (!pname)
return false;
- if (!xtables_find_match(pname, XTF_DONT_LOAD, NULL))
+ match = xtables_find_match(pname, XTF_DONT_LOAD, NULL);
+ if (!match)
return true;
+ /* Free any kind of clone from xtables_find_match */
+ if (match == match->next)
+ free(match);
return !r->protocol_loaded;
}
fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
struct fw3_port *sp, struct fw3_port *dp)
{
- char buf[sizeof("65535:65535\0")];
+ char buf[sizeof("65535:65535")];
if ((!sp || !sp->set) && (!dp || !dp->set))
return;
if (sp && sp->set)
{
if (sp->port_min == sp->port_max)
- sprintf(buf, "%u", sp->port_min);
+ snprintf(buf, sizeof(buf), "%u", sp->port_min);
else
- sprintf(buf, "%u:%u", sp->port_min, sp->port_max);
+ 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);
+ snprintf(buf, sizeof(buf), "%u", dp->port_min);
else
- sprintf(buf, "%u:%u", dp->port_min, dp->port_max);
+ 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)
{
+ struct fw3_device dev = { .any = false };
+
if (device) {
- struct fw3_device dev = { .any = false };
- strncpy(dev.name, device, sizeof(dev.name) - 1);
+ snprintf(dev.name, sizeof(dev.name), "%s", device);
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")];
+ char buf[sizeof("ff:ff:ff:ff:ff:ff")];
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]);
+ snprintf(buf, sizeof(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")];
+ char buf[sizeof("255/255")];
if (!icmp)
return;
if (r->h->family == FW3_FAMILY_V6)
{
if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
- sprintf(buf, "%u", icmp->type6);
+ snprintf(buf, sizeof(buf), "%u", icmp->type6);
else
- sprintf(buf, "%u/%u", icmp->type6, icmp->code6_min);
+ snprintf(buf, sizeof(buf), "%u/%u", icmp->type6, icmp->code6_min);
fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
}
#endif
{
if (icmp->code_min == 0 && icmp->code_max == 0xFF)
- sprintf(buf, "%u", icmp->type);
+ snprintf(buf, sizeof(buf), "%u", icmp->type);
else
- sprintf(buf, "%u/%u", icmp->type, icmp->code_min);
+ 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")];
+ char buf[sizeof("-4294967296/second")];
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]);
+ snprintf(buf, sizeof(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);
+ snprintf(buf, sizeof(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 buf[sizeof("dst,dst,dst")];
char *p = buf;
- int i = 0;
+ int i = 0, len;
+ size_t rem = sizeof(buf);
struct fw3_ipset *set;
struct fw3_ipset_datatype *type;
if (i >= 3)
break;
- if (p > buf)
+ if (p > buf) {
+ if (rem <= 1)
+ break;
+
*p++ = ',';
+ *p = 0;
+ rem--;
+ }
+
+ len = snprintf(p, rem, "%s", match->dir[i] ? match->dir[i] : type->dir);
+
+ if (len < 0 || len >= rem)
+ break;
+
+ rem -= len;
+ p += len;
- p += sprintf(p, "%s", match->dir[i] ? match->dir[i] : type->dir);
i++;
}
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;
+ int i, len;
struct tm empty = { 0 };
- char buf[84]; /* sizeof("1,2,3,...,30,31\0") */
+ char buf[84]; /* sizeof("1,2,3,...,30,31") */
char *p;
bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
+ size_t rem;
+
if (!d1 && !d2 && !time->timestart && !time->timestop &&
!(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
{
fw3_ipt_rule_addarg(r, false, "-m", "time");
- if (time->utc)
- fw3_ipt_rule_addarg(r, false, "--utc", NULL);
+ if (!time->utc)
+ fw3_ipt_rule_addarg(r, false, "--kerneltz", NULL);
if (d1)
{
if (time->timestart)
{
- sprintf(buf, "%02d:%02d:%02d",
+ snprintf(buf, sizeof(buf), "%02d:%02d:%02d",
time->timestart / 3600,
time->timestart % 3600 / 60,
time->timestart % 60);
if (time->timestop)
{
- sprintf(buf, "%02d:%02d:%02d",
+ snprintf(buf, sizeof(buf), "%02d:%02d:%02d",
time->timestop / 3600,
time->timestop % 3600 / 60,
time->timestop % 60);
if (time->monthdays & 0xFFFFFFFE)
{
- for (i = 1, p = buf; i < 32; i++)
+ for (i = 1, p = buf, rem = sizeof(buf); i < 32; i++)
{
if (fw3_hasbit(time->monthdays, i))
{
- if (p > buf)
+ if (p > buf) {
+ if (rem <= 1)
+ break;
+
*p++ = ',';
+ *p = 0;
+ rem--;
+ }
+
+ len = snprintf(p, rem, "%u", i);
+
+ if (len < 0 || len >= rem)
+ break;
- p += sprintf(p, "%u", i);
+ rem -= len;
+ p += len;
}
}
if (time->weekdays & 0xFE)
{
- for (i = 1, p = buf; i < 8; i++)
+ for (i = 1, p = buf, rem = sizeof(buf); i < 8; i++)
{
if (fw3_hasbit(time->weekdays, i))
{
- if (p > buf)
+ if (p > buf) {
+ if (rem <= 1)
+ break;
+
*p++ = ',';
+ *p = 0;
+ rem--;
+ }
- p += sprintf(p, "%u", i);
+ len = snprintf(p, rem, "%u", i);
+
+ if (len < 0 || len >= rem)
+ break;
+
+ rem -= len;
+ p += len;
}
}
void
fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark)
{
- char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF\0")];
+ char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF")];
if (!mark || !mark->set)
return;
if (mark->mask < 0xFFFFFFFF)
- sprintf(buf, "0x%x/0x%x", mark->mark, mark->mask);
+ snprintf(buf, sizeof(buf), "0x%x/0x%x", mark->mark, mark->mask);
else
- sprintf(buf, "0x%x", mark->mark);
+ snprintf(buf, sizeof(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")];
+
+ if (!dscp || !dscp->set)
+ return;
+
+ snprintf(buf, sizeof(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, ...)
{
return;
va_start(ap, fmt);
- vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
+ vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
fw3_ipt_rule_addarg(r, false, "-m", "comment");
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 buf1[sizeof("255.255.255.255")], buf2[sizeof("255.255.255.255")];
char *pname;
if (e->ip.proto)
p += SZ(ip6t_entry_match) + m->match->size;
}
- memset(p, 0xFF, SZ(ip6t_entry_target) + (r->target) ? r->target->userspacesize : 0);
+ memset(p, 0xFF, SZ(ip6t_entry_target) + (r->target ? r->target->userspacesize : 0));
}
else
#endif
p += SZ(ipt_entry_match) + m->match->size;
}
- memset(p, 0xFF, SZ(ipt_entry_target) + (r->target) ? r->target->userspacesize : 0);
+ memset(p, 0xFF, SZ(ipt_entry_target) + (r->target ? r->target->userspacesize : 0));
}
return mask;
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];
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:", g->opts,
+ while ((optc = getopt_long(r->argc, r->argv, "-:m:j:i:o:s:d:", g->opts,
NULL)) != -1)
{
switch (optc)
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'))
{
projects / project / firewall3.git / blobdiff