set by evutil_check_interfaces. */
static int have_checked_interfaces, had_ipv4_address, had_ipv6_address;
-/* Macro: True iff the IPv4 address 'addr', in host order, is in 127.0.0.0/8
- */
-#define EVUTIL_V4ADDR_IS_LOCALHOST(addr) (((addr)>>24) == 127)
+/* True iff the IPv4 address 'addr', in host order, is in 127.0.0.0/8 */
+static inline int evutil_v4addr_is_localhost(ev_uint32_t addr)
+{ return addr>>24 == 127; }
-/* Macro: True iff the IPv4 address 'addr', in host order, is a class D
- * (multiclass) address.
- */
-#define EVUTIL_V4ADDR_IS_CLASSD(addr) ((((addr)>>24) & 0xf0) == 0xe0)
+/* True iff the IPv4 address 'addr', in host order, is link-local
+ * 169.254.0.0/16 (RFC3927) */
+static inline int evutil_v4addr_is_linklocal(ev_uint32_t addr)
+{ return ((addr & 0xffff0000U) == 0xa9fe0000U); }
+
+/* True iff the IPv4 address 'addr', in host order, is a class D
+ * (multiclass) address. */
+static inline int evutil_v4addr_is_classd(ev_uint32_t addr)
+{ return ((addr>>24) & 0xf0) == 0xe0; }
+
+int
+evutil_v4addr_is_local_(const struct in_addr *in)
+{
+ const ev_uint32_t addr = ntohl(in->s_addr);
+ return addr == INADDR_ANY ||
+ evutil_v4addr_is_localhost(addr) ||
+ evutil_v4addr_is_linklocal(addr) ||
+ evutil_v4addr_is_classd(addr);
+}
+int
+evutil_v6addr_is_local_(const struct in6_addr *in)
+{
+ static const char ZEROES[] =
+ "\x00\x00\x00\x00\x00\x00\x00\x00"
+ "\x00\x00\x00\x00\x00\x00\x00\x00";
+
+ const unsigned char *addr = (const unsigned char *)in->s6_addr;
+ return !memcmp(addr, ZEROES, 8) ||
+ ((addr[0] & 0xfe) == 0xfc) ||
+ (addr[0] == 0xfe && (addr[1] & 0xc0) == 0x80) ||
+ (addr[0] == 0xfe && (addr[1] & 0xc0) == 0xc0) ||
+ (addr[0] == 0xff);
+}
static void
evutil_found_ifaddr(const struct sockaddr *sa)
{
- const char ZEROES[] = "\x00\x00\x00\x00\x00\x00\x00\x00"
- "\x00\x00\x00\x00\x00\x00\x00\x00";
-
if (sa->sa_family == AF_INET) {
const struct sockaddr_in *sin = (struct sockaddr_in *)sa;
- ev_uint32_t addr = ntohl(sin->sin_addr.s_addr);
- if (addr == 0 ||
- EVUTIL_V4ADDR_IS_LOCALHOST(addr) ||
- EVUTIL_V4ADDR_IS_CLASSD(addr)) {
- /* Not actually a usable external address. */
- } else {
+ if (!evutil_v4addr_is_local_(&sin->sin_addr)) {
event_debug(("Detected an IPv4 interface"));
had_ipv4_address = 1;
}
} else if (sa->sa_family == AF_INET6) {
const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
- const unsigned char *addr =
- (unsigned char*)sin6->sin6_addr.s6_addr;
- if (!memcmp(addr, ZEROES, 8) ||
- ((addr[0] & 0xfe) == 0xfc) ||
- (addr[0] == 0xfe && (addr[1] & 0xc0) == 0x80) ||
- (addr[0] == 0xfe && (addr[1] & 0xc0) == 0xc0) ||
- (addr[0] == 0xff)) {
- /* This is a reserved, ipv4compat, ipv4map, loopback,
- * link-local, multicast, or unspecified address. */
- } else {
+ if (!evutil_v6addr_is_local_(&sin6->sin6_addr)) {
event_debug(("Detected an IPv6 interface"));
had_ipv6_address = 1;
}
;
}
+static void
+test_evutil_v4addr_is_local(void *arg)
+{
+ struct sockaddr_in sin;
+ sin.sin_family = AF_INET;
+
+ /* we use evutil_inet_pton() here to fill in network-byte order */
+#define LOCAL(str, yes) do { \
+ tt_int_op(evutil_inet_pton(AF_INET, str, &sin.sin_addr), ==, 1); \
+ tt_int_op(evutil_v4addr_is_local_(&sin.sin_addr), ==, yes); \
+} while (0)
+
+ /** any */
+ sin.sin_addr.s_addr = INADDR_ANY;
+ tt_int_op(evutil_v4addr_is_local_(&sin.sin_addr), ==, 1);
+
+ /** loopback */
+ sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+ tt_int_op(evutil_v4addr_is_local_(&sin.sin_addr), ==, 1);
+ LOCAL("127.0.0.1", 1);
+ LOCAL("127.255.255.255", 1);
+ LOCAL("121.0.0.1", 0);
+
+ /** link-local */
+ LOCAL("169.254.0.1", 1);
+ LOCAL("169.254.255.255", 1);
+ LOCAL("170.0.0.0", 0);
+
+ /** Multicast */
+ LOCAL("224.0.0.0", 1);
+ LOCAL("239.255.255.255", 1);
+ LOCAL("240.0.0.0", 0);
+end:
+ ;
+}
+
+static void
+test_evutil_v6addr_is_local(void *arg)
+{
+ struct sockaddr_in6 sin6;
+ struct in6_addr anyaddr = IN6ADDR_ANY_INIT;
+ struct in6_addr loopback = IN6ADDR_LOOPBACK_INIT;
+
+ sin6.sin6_family = AF_INET6;
+#define LOCAL6(str, yes) do { \
+ tt_int_op(evutil_inet_pton(AF_INET6, str, &sin6.sin6_addr), ==, 1);\
+ tt_int_op(evutil_v6addr_is_local_(&sin6.sin6_addr), ==, yes); \
+} while (0)
+
+ /** any */
+ tt_int_op(evutil_v6addr_is_local_(&anyaddr), ==, 1);
+ LOCAL6("::0", 1);
+
+ /** loopback */
+ tt_int_op(evutil_v6addr_is_local_(&loopback), ==, 1);
+ LOCAL6("::1", 1);
+
+ /** IPV4 mapped */
+ LOCAL6("::ffff:0:0", 1);
+ /** IPv4 translated */
+ LOCAL6("::ffff:0:0:0", 1);
+ /** IPv4/IPv6 translation */
+ LOCAL6("64:ff9b::", 0);
+ /** Link-local */
+ LOCAL6("fe80::", 1);
+ /** Multicast */
+ LOCAL6("ff00::", 1);
+ /** Unspecified */
+ LOCAL6("::", 1);
+
+ /** Global Internet */
+ LOCAL6("2001::", 0);
+ LOCAL6("2001:4860:4802:32::1b", 0);
+end:
+ ;
+}
+
struct testcase_t util_testcases[] = {
{ "ipv4_parse", regress_ipv4_parse, 0, NULL, NULL },
{ "ipv6_parse", regress_ipv6_parse, 0, NULL, NULL },
{ "monotonic_prc_precise", test_evutil_monotonic_prc, 0, &basic_setup, (void*)"precise" },
{ "monotonic_prc_fallback", test_evutil_monotonic_prc, 0, &basic_setup, (void*)"fallback" },
{ "date_rfc1123", test_evutil_date_rfc1123, 0, NULL, NULL },
+ { "evutil_v4addr_is_local", test_evutil_v4addr_is_local, 0, NULL, NULL },
+ { "evutil_v6addr_is_local", test_evutil_v6addr_is_local, 0, NULL, NULL },
END_OF_TESTCASES,
};
void evutil_memclear_(void *mem, size_t len);
+struct in_addr;
+struct in6_addr;
+
+/* This is a any, loopback, link-local, multicast */
+EVENT2_EXPORT_SYMBOL
+int evutil_v4addr_is_local_(const struct in_addr *in);
+/* This is a reserved, ipv4compat, ipv4map, loopback,
+ * link-local, multicast, or unspecified address. */
+EVENT2_EXPORT_SYMBOL
+int evutil_v6addr_is_local_(const struct in6_addr *in);
+
#ifdef __cplusplus
}
#endif