/*
* firewall3 - 3rd OpenWrt UCI firewall implementation
*
- * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
+ * 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
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
+#define _GNU_SOURCE
+
+#include <net/if.h>
+#include <sys/ioctl.h>
+
#include "utils.h"
#include "options.h"
#include "ipsets.h"
-static int lock_fd = -1;
+static int fw3_lock_fd = -1;
static pid_t pipe_pid = -1;
static FILE *pipe_fd = NULL;
mem = calloc(1, size);
if (!mem)
- error("Out of memory while allocating %d bytes", size);
+ error("Out of memory while allocating %zd bytes", size);
return mem;
}
return false;
argn = 2;
- args = malloc(argn * sizeof(arg));
+ args = calloc(argn, sizeof(arg));
if (!args)
return false;
switch ((pid = fork()))
{
case -1:
+ free(args);
return false;
case 0:
}
pipe_fd = fdopen(pfds[1], "w");
+ free(args);
return true;
}
bool
-fw3_lock(void)
+fw3_lock_path(int *fd, const char *path)
{
- lock_fd = open(FW3_LOCKFILE, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
+ int lock_fd = open(path, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
if (lock_fd < 0)
{
- warn("Cannot create lock file %s: %s", FW3_LOCKFILE, strerror(errno));
+ warn("Cannot create lock file %s: %s", path, strerror(errno));
return false;
}
return false;
}
+ *fd = lock_fd;
+
return true;
}
+bool
+fw3_lock()
+{
+ return fw3_lock_path(&fw3_lock_fd, FW3_LOCKFILE);
+}
+
+
void
-fw3_unlock(void)
+fw3_unlock_path(int *fd, const char *lockpath)
{
- if (lock_fd < 0)
+ if (*fd < 0)
return;
- if (flock(lock_fd, LOCK_UN))
+ if (flock(*fd, LOCK_UN))
warn("Cannot release exclusive lock: %s", strerror(errno));
- close(lock_fd);
+ close(*fd);
unlink(FW3_LOCKFILE);
- lock_fd = -1;
+ *fd = -1;
+}
+
+
+void
+fw3_unlock(void)
+{
+ fw3_unlock_path(&fw3_lock_fd, FW3_LOCKFILE);
}
static void
write_zone_uci(struct uci_context *ctx, struct fw3_zone *z,
- struct uci_package *dest)
+ struct uci_package *dest, struct ifaddrs *ifaddr)
{
struct fw3_device *dev;
struct fw3_address *sub;
+ struct ifaddrs *ifa;
enum fw3_family fam = FW3_FAMILY_ANY;
- char *p, buf[34];
+ char *p, buf[INET6_ADDRSTRLEN];
struct uci_ptr ptr = { .p = dest };
ptr.value = z->masq ? "1" : "0";
uci_set(ctx, &ptr);
- ptr.o = NULL;
- ptr.option = "conntrack";
- ptr.value = z->conntrack ? "1" : "0";
- uci_set(ctx, &ptr);
-
ptr.o = NULL;
ptr.option = "mtu_fix";
ptr.value = z->mtu_fix ? "1" : "0";
fw3_foreach(dev, &z->devices)
{
+ char *ep;
+
if (!dev)
continue;
p = buf;
+ ep = buf + sizeof(buf);
if (dev->invert)
- p += sprintf(p, "!");
+ p += snprintf(p, ep - p, "!");
if (*dev->network)
- p += sprintf(p, "%s@%s", dev->name, dev->network);
+ p += snprintf(p, ep - p, "%s@%s", dev->name, dev->network);
else
- p += sprintf(p, "%s", dev->name);
+ p += snprintf(p, ep - p, "%s", dev->name);
ptr.value = buf;
uci_add_list(ctx, &ptr);
if (!sub)
continue;
- ptr.value = fw3_address_to_string(sub, true);
+ ptr.value = fw3_address_to_string(sub, true, false);
uci_add_list(ctx, &ptr);
}
+ ptr.o = NULL;
+ ptr.option = "__addrs";
+
+ fw3_foreach(dev, &z->devices)
+ {
+ if (!dev)
+ continue;
+
+ for (ifa = ifaddr; ifa; ifa = ifa->ifa_next)
+ {
+ if (!ifa->ifa_addr || strcmp(dev->name, ifa->ifa_name))
+ continue;
+
+ if (ifa->ifa_addr->sa_family == AF_INET)
+ inet_ntop(AF_INET,
+ &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr,
+ buf, sizeof(buf));
+ else if (ifa->ifa_addr->sa_family == AF_INET6)
+ inet_ntop(AF_INET6,
+ &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr,
+ buf, sizeof(buf));
+ else
+ continue;
+
+ ptr.value = buf;
+ uci_add_list(ctx, &ptr);
+ }
+ }
+
sprintf(buf, "0x%x", z->flags[0]);
ptr.o = NULL;
ptr.option = "__flags_v4";
ptr.value = s->name;
uci_set(ctx, &ptr);
+ ptr.o = NULL;
+ ptr.option = "family";
+ if (s->family == FW3_FAMILY_V4)
+ ptr.value = "ipv4";
+ else
+ ptr.value = "ipv6";
+ uci_set(ctx, &ptr);
+
ptr.o = NULL;
ptr.option = "storage";
ptr.value = fw3_ipset_method_names[s->method];
{
ptr.o = NULL;
ptr.option = "iprange";
- ptr.value = fw3_address_to_string(&s->iprange, false);
+ ptr.value = fw3_address_to_string(&s->iprange, false, false);
uci_set(ctx, &ptr);
}
struct fw3_state *s = state;
struct fw3_zone *z;
struct fw3_ipset *i;
+ struct ifaddrs *ifaddr;
struct uci_package *p;
return;
}
+ if (getifaddrs(&ifaddr))
+ {
+ warn("Cannot get interface addresses: %s", strerror(errno));
+ ifaddr = NULL;
+ }
+
if ((p = uci_lookup_package(s->uci, "fw3_state")) != NULL)
uci_unload(s->uci, p);
write_defaults_uci(s->uci, &s->defaults, p);
list_for_each_entry(z, &s->zones, list)
- write_zone_uci(s->uci, z, p);
+ write_zone_uci(s->uci, z, p, ifaddr);
list_for_each_entry(i, &s->ipsets, list)
write_ipset_uci(s->uci, i, p);
fsync(fileno(sf));
fclose(sf);
+
+ if (ifaddr)
+ freeifaddrs(ifaddr);
}
}
close(0);
close(1);
close(2);
- chdir("/");
+ if (chdir("/")) {};
clearenv();
setenv("ACTION", add ? "add" : "remove", 1);
/* unreached */
return false;
}
+
+int
+fw3_netmask2bitlen(int family, void *mask)
+{
+ int bits;
+ struct in_addr *v4;
+ struct in6_addr *v6;
+
+ if (family == FW3_FAMILY_V6)
+ for (bits = 0, v6 = mask;
+ bits < 128 && (v6->s6_addr[bits / 8] << (bits % 8)) & 128;
+ bits++);
+ else
+ for (bits = 0, v4 = mask;
+ bits < 32 && (ntohl(v4->s_addr) << bits) & 0x80000000;
+ bits++);
+
+ return bits;
+}
+
+bool
+fw3_bitlen2netmask(int family, int bits, void *mask)
+{
+ int i;
+ uint8_t rem, b;
+ struct in_addr *v4;
+ struct in6_addr *v6;
+
+ if (family == FW3_FAMILY_V6)
+ {
+ if (bits < -128 || bits > 128)
+ return false;
+
+ v6 = mask;
+ rem = abs(bits);
+
+ for (i = 0; i < sizeof(v6->s6_addr); i++)
+ {
+ b = (rem > 8) ? 8 : rem;
+ v6->s6_addr[i] = (uint8_t)(0xFF << (8 - b));
+ rem -= b;
+ }
+
+ if (bits < 0)
+ for (i = 0; i < sizeof(v6->s6_addr); i++)
+ v6->s6_addr[i] = ~v6->s6_addr[i];
+ }
+ else
+ {
+ if (bits < -32 || bits > 32)
+ return false;
+
+ v4 = mask;
+ v4->s_addr = bits ? htonl(~((1 << (32 - abs(bits))) - 1)) : 0;
+
+ if (bits < 0)
+ v4->s_addr = ~v4->s_addr;
+ }
+
+ return true;
+}
+
+void
+fw3_flush_conntrack(void *state)
+{
+ bool found;
+ struct fw3_state *s = state;
+ struct fw3_address *addr;
+ struct fw3_device *dev;
+ struct fw3_zone *zone;
+ struct ifaddrs *ifaddr, *ifa;
+ struct sockaddr_in *sin;
+ struct sockaddr_in6 *sin6;
+ char buf[INET6_ADDRSTRLEN];
+ FILE *ct;
+
+ if (!state)
+ {
+ if ((ct = fopen("/proc/net/nf_conntrack", "w")) != NULL)
+ {
+ info(" * Flushing conntrack table ...");
+
+ fwrite("f\n", 1, 2, ct);
+ fclose(ct);
+ }
+
+ return;
+ }
+
+ if (getifaddrs(&ifaddr))
+ {
+ warn("Cannot get interface addresses: %s", strerror(errno));
+ return;
+ }
+
+ if ((ct = fopen("/proc/net/nf_conntrack", "w")) != NULL)
+ {
+ list_for_each_entry(zone, &s->zones, list)
+ list_for_each_entry(addr, &zone->old_addrs, list)
+ {
+ found = false;
+
+ list_for_each_entry(dev, &zone->devices, list)
+ {
+ for (ifa = ifaddr; ifa && !found; ifa = ifa->ifa_next)
+ {
+ if (!ifa->ifa_addr || strcmp(dev->name, ifa->ifa_name))
+ continue;
+
+ sin = (struct sockaddr_in *)ifa->ifa_addr;
+ sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
+
+ if (addr->family == FW3_FAMILY_V4 &&
+ sin->sin_family == AF_INET)
+ {
+ found = !memcmp(&addr->address.v4, &sin->sin_addr,
+ sizeof(sin->sin_addr));
+ }
+ else if (addr->family == FW3_FAMILY_V6 &&
+ sin6->sin6_family == AF_INET6)
+ {
+ found = !memcmp(&addr->address.v6, &sin6->sin6_addr,
+ sizeof(sin6->sin6_addr));
+ }
+ }
+
+ if (found)
+ break;
+ }
+
+ if (!found)
+ {
+ inet_ntop(addr->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
+ &addr->address.v4, buf, sizeof(buf));
+
+ info(" * Flushing conntrack: %s", buf);
+ fprintf(ct, "%s\n", buf);
+ }
+ }
+
+ fclose(ct);
+ }
+
+ freeifaddrs(ifaddr);
+}
+
+bool fw3_attr_parse_name_type(struct blob_attr *entry, const char **name, const char **type)
+{
+ struct blob_attr *opt;
+ unsigned orem;
+
+ if (!type || !name)
+ return false;
+
+ *type = NULL;
+
+ blobmsg_for_each_attr(opt, entry, orem)
+ if (!strcmp(blobmsg_name(opt), "type"))
+ *type = blobmsg_get_string(opt);
+ else if (!strcmp(blobmsg_name(opt), "name"))
+ *name = blobmsg_get_string(opt);
+
+ return *type != NULL ? true : false;
+}
+
+const char *
+fw3_protoname(void *proto)
+{
+ static char buf[sizeof("4294967295")];
+ struct fw3_protocol *p = proto;
+ struct protoent *pe;
+
+ if (!p)
+ return "?";
+
+ pe = getprotobynumber(p->protocol);
+
+ if (!pe)
+ {
+ snprintf(buf, sizeof(buf), "%u", p->protocol);
+ return buf;
+ }
+
+ return pe->p_name;
+}
+
+bool
+fw3_check_loopback_dev(const char *name)
+{
+ struct ifreq ifr;
+ int s;
+ bool rv = false;
+
+ s = socket(AF_LOCAL, SOCK_DGRAM, 0);
+
+ if (s < 0)
+ return false;
+
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name) - 1);
+
+ if (ioctl(s, SIOCGIFFLAGS, &ifr) >= 0) {
+ if (ifr.ifr_flags & IFF_LOOPBACK)
+ rv = true;
+ }
+
+ close(s);
+
+ return rv;
+}
+
+bool
+fw3_check_loopback_addr(struct fw3_address *addr)
+{
+ if (addr->family == FW3_FAMILY_V4 &&
+ (ntohl(addr->address.v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
+ return true;
+
+ if (addr->family == FW3_FAMILY_V6 && !addr->range &&
+ fw3_netmask2bitlen(FW3_FAMILY_V6, &addr->mask.v6) == 128 &&
+ IN6_IS_ADDR_LOOPBACK(&addr->address.v6))
+ return true;
+
+ return false;
+}
projects / project / firewall3.git / blobdiff