1 files changed, 79 insertions, 42 deletions

diff --git a/src/common/address.c b/src/common/address.c
index 42a116a91e..80f65e916f 100644
--- a/src/common/address.c
+++ b/src/common/address.c
@@ -10,17 +10,31 @@
 
 #define ADDRESS_PRIVATE
 
+#include "orconfig.h"
+
 #ifdef _WIN32
 /* For access to structs needed by GetAdaptersAddresses */
-#undef _WIN32_WINNT
-#define _WIN32_WINNT 0x0501
-#include <process.h>
+#ifndef WIN32_LEAN_AND_MEAN
+#error "orconfig.h didn't define WIN32_LEAN_AND_MEAN"
+#endif
+#ifndef WINVER
+#error "orconfig.h didn't define WINVER"
+#endif
+#ifndef _WIN32_WINNT
+#error "orconfig.h didn't define _WIN32_WINNT"
+#endif
+#if WINVER < 0x0501
+#error "winver too low"
+#endif
+#if _WIN32_WINNT < 0x0501
+#error "winver too low"
+#endif
 #include <winsock2.h>
+#include <process.h>
 #include <windows.h>
 #include <iphlpapi.h>
 #endif
 
-#include "orconfig.h"
 #include "compat.h"
 #include "util.h"
 #include "address.h"
@@ -1504,47 +1518,22 @@ tor_addr_is_multicast(const tor_addr_t *a)
   return 0;
 }
 
-/** Set *<b>addr</b> to the IP address (if any) of whatever interface
- * connects to the Internet.  This address should only be used in checking
- * whether our address has changed.  Return 0 on success, -1 on failure.
+/** Attempt to retrieve IP address of current host by utilizing some
+ * UDP socket trickery. Only look for address of given <b>family</b>.
+ * Set result to *<b>addr</b>. Return 0 on success, -1 on failure.
  */
-MOCK_IMPL(int,
-get_interface_address6,(int severity, sa_family_t family, tor_addr_t *addr))
+STATIC int
+get_interface_address6_via_udp_socket_hack(int severity,
+                                           sa_family_t family,
+                                           tor_addr_t *addr)
 {
-  /* XXX really, this function should yield a smartlist of addresses. */
-  smartlist_t *addrs;
-  int sock=-1, r=-1;
   struct sockaddr_storage my_addr, target_addr;
+  int sock=-1, r=-1;
   socklen_t addr_len;
-  tor_assert(addr);
-
-  /* Try to do this the smart way if possible. */
-  if ((addrs = get_interface_addresses_raw(severity))) {
-    int rv = -1;
-    SMARTLIST_FOREACH_BEGIN(addrs, tor_addr_t *, a) {
-      if (family != AF_UNSPEC && family != tor_addr_family(a))
-        continue;
-      if (tor_addr_is_loopback(a) ||
-          tor_addr_is_multicast(a))
-        continue;
-
-      tor_addr_copy(addr, a);
-      rv = 0;
-
-      /* If we found a non-internal address, declare success.  Otherwise,
-       * keep looking. */
-      if (!tor_addr_is_internal(a, 0))
-        break;
-    } SMARTLIST_FOREACH_END(a);
-
-    SMARTLIST_FOREACH(addrs, tor_addr_t *, a, tor_free(a));
-    smartlist_free(addrs);
-    return rv;
-  }
 
-  /* Okay, the smart way is out. */
   memset(addr, 0, sizeof(tor_addr_t));
   memset(&target_addr, 0, sizeof(target_addr));
+
   /* Don't worry: no packets are sent. We just need to use a real address
    * on the actual Internet. */
   if (family == AF_INET6) {
@@ -1566,6 +1555,7 @@ get_interface_address6,(int severity, sa_family_t family, tor_addr_t *addr))
   } else {
     return -1;
   }
+
   if (sock < 0) {
     int e = tor_socket_errno(-1);
     log_fn(severity, LD_NET, "unable to create socket: %s",
@@ -1573,27 +1563,74 @@ get_interface_address6,(int severity, sa_family_t family, tor_addr_t *addr))
     goto err;
   }
 
-  if (connect(sock,(struct sockaddr *)&target_addr, addr_len) < 0) {
+  if (tor_connect_socket(sock,(struct sockaddr *)&target_addr,
+                         addr_len) < 0) {
     int e = tor_socket_errno(sock);
     log_fn(severity, LD_NET, "connect() failed: %s", tor_socket_strerror(e));
     goto err;
   }
 
-  if (getsockname(sock,(struct sockaddr*)&my_addr, &addr_len)) {
+  if (tor_getsockname(sock,(struct sockaddr*)&my_addr, &addr_len)) {
     int e = tor_socket_errno(sock);
     log_fn(severity, LD_NET, "getsockname() to determine interface failed: %s",
            tor_socket_strerror(e));
     goto err;
   }
 
-  tor_addr_from_sockaddr(addr, (struct sockaddr*)&my_addr, NULL);
-  r=0;
+ if (tor_addr_from_sockaddr(addr, (struct sockaddr*)&my_addr, NULL) == 0) {
+    if (tor_addr_is_loopback(addr) || tor_addr_is_multicast(addr)) {
+      log_fn(severity, LD_NET, "Address that we determined via UDP socket"
+                               " magic is unsuitable for public comms.");
+    } else {
+      r=0;
+    }
+ }
+
  err:
   if (sock >= 0)
     tor_close_socket(sock);
   return r;
 }
 
+/** Set *<b>addr</b> to the IP address (if any) of whatever interface
+ * connects to the Internet.  This address should only be used in checking
+ * whether our address has changed.  Return 0 on success, -1 on failure.
+ */
+MOCK_IMPL(int,
+get_interface_address6,(int severity, sa_family_t family, tor_addr_t *addr))
+{
+  /* XXX really, this function should yield a smartlist of addresses. */
+  smartlist_t *addrs;
+  tor_assert(addr);
+
+  /* Try to do this the smart way if possible. */
+  if ((addrs = get_interface_addresses_raw(severity))) {
+    int rv = -1;
+    SMARTLIST_FOREACH_BEGIN(addrs, tor_addr_t *, a) {
+      if (family != AF_UNSPEC && family != tor_addr_family(a))
+        continue;
+      if (tor_addr_is_loopback(a) ||
+          tor_addr_is_multicast(a))
+        continue;
+
+      tor_addr_copy(addr, a);
+      rv = 0;
+
+      /* If we found a non-internal address, declare success.  Otherwise,
+       * keep looking. */
+      if (!tor_addr_is_internal(a, 0))
+        break;
+    } SMARTLIST_FOREACH_END(a);
+
+    SMARTLIST_FOREACH(addrs, tor_addr_t *, a, tor_free(a));
+    smartlist_free(addrs);
+    return rv;
+  }
+
+  /* Okay, the smart way is out. */
+  return get_interface_address6_via_udp_socket_hack(severity,family,addr);
+}
+
 /* ======
  * IPv4 helpers
  * XXXX024 IPv6 deprecate some of these.