Added code to test gnunet's dns resolver service. The test code compares gnunet's results to the system's own forward and reverse name resolution. Using dns root server as a targets to get a static 1:1 mapping

1 files changed, 169 insertions, 0 deletions

diff --git a/src/util/test_resolver_api.c b/src/util/test_resolver_api.c
index 194ed2f8f..b8a0eb29a 100644
--- a/src/util/test_resolver_api.c
+++ b/src/util/test_resolver_api.c
@@ -32,6 +32,11 @@
 
 #define VERBOSE GNUNET_NO
 
+// Using dns rootservers to check gnunet's resolver service
+// a.root-servers.net <-> 198.41.0.4 is a fix 1:1 mapping that should not change over years
+// For more information have a look at IANA's website http://www.root-servers.org/
+#define ROOTSERVER_NAME "a.root-servers.net"
+#define ROOTSERVER_IP   "198.41.0.4"
 
 static void
 check_hostname (void *cls, const struct sockaddr *sa, socklen_t salen)
@@ -123,6 +128,57 @@ check_127 (void *cls, const struct sockaddr *sa, socklen_t salen)
 }
 
 static void
+check_rootserver_ip (void *cls, const struct sockaddr *sa, socklen_t salen)
+{
+  int *ok = cls;
+  const struct sockaddr_in *sai = (const struct sockaddr_in *) sa;
+
+  if (sa == NULL)
+    return;
+  GNUNET_assert (sizeof (struct sockaddr_in) == salen);
+  
+  if ( 0 == strcmp(inet_ntoa(sai->sin_addr),ROOTSERVER_IP))
+    {
+#if DEBUG_RESOLVER
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received correct rootserver ip address.\n");
+#endif
+      (*ok) &= ~1;
+    }
+  else
+    {
+#if DEBUG_RESOLVER
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received incorrect rootserver ip address.\n");
+#endif
+      GNUNET_break (0);
+    }
+}
+
+static void
+check_rootserver_name (void *cls, const char *hostname)
+{
+  int *ok = cls;
+  if (hostname == NULL)
+   return;
+    
+  if (0 == strcmp (hostname, ROOTSERVER_NAME))
+    {
+#if DEBUG_RESOLVER
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                  "Received correct rootserver hostname `%s'.\n", hostname);
+#endif
+      (*ok) &= ~2;
+    }
+  else
+    {
+#if DEBUG_RESOLVER
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                  "Received invalid rootserver hostname `%s'.\n", hostname);
+#endif
+      GNUNET_break (0);
+    }
+}
+
+static void
 run (void *cls,
      struct GNUNET_SCHEDULER_Handle *sched,
      char *const *args,
@@ -152,6 +208,119 @@ run (void *cls,
   GNUNET_RESOLVER_hostname_resolve (sched,
                                     cfg,
                                     AF_UNSPEC, timeout, &check_hostname, cls);
+  // Testing non-local dns resolution
+  // DNS Rootserver to test: a.root-servers.net - 198.41.0.4  
+  
+  char const * rootserver_name = ROOTSERVER_NAME;
+  
+  struct hostent *rootserver;
+  
+  rootserver = gethostbyname(rootserver_name);
+  if (rootserver == NULL)
+    {
+      // Error: resolving ip addresses does not work
+      #if DEBUG_RESOLVER
+      switch (h_errno)
+        {
+        
+        case HOST_NOT_FOUND: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "gethostbyname() could not lookup ip address: HOST_NOT_FOUND\n");break;
+        case NO_ADDRESS: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "gethostbyname() could not lookup ip address: NO_ADDRESS\n");break;
+        case NO_RECOVERY: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "gethostbyname() could not lookup ip address: NO_RECOVERY\n");break;
+        case TRY_AGAIN: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "gethostbyname() could not lookup ip address: TRY_AGAIN\n");break;
+        }
+      #endif
+      GNUNET_break (0);
+    }
+  else 
+  {
+    // Counting returned ip addresses
+    int count_ips =0 ;
+    while (rootserver->h_addr_list[count_ips]!=NULL)
+    {
+      count_ips++;
+    }    
+    if ( count_ips > 1) 
+    {
+      #if DEBUG_RESOLVER
+        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received ip range for root name server, but a root nameserver has only 1 ip\n");
+      #endif
+      GNUNET_break (0);
+    }
+    
+    // Comparing to resolved address to the address the root nameserver should have
+    if ( strcmp(inet_ntoa( *(struct in_addr *) rootserver->h_addr_list[0]),ROOTSERVER_IP) !=0)
+    {
+      #if DEBUG_RESOLVER
+        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received ip and ip for root name server differ\n");
+      #endif
+      GNUNET_break (0);      
+    }
+    
+    #if DEBUG_RESOLVER
+        GNUNET_log (GNUNET_ERROR_TYPE_INFO, "System's own forward name resolution is working\n");
+    #endif
+    
+    // Resolve the same using GNUNET
+    GNUNET_RESOLVER_ip_get (sched, cfg, ROOTSERVER_NAME, AF_INET, timeout, &check_rootserver_ip, cls);
+    
+    // Success: forward lookups work as exptected
+    
+    
+    // Next step: reverse lookups
+
+    struct in_addr rootserver_addr;
+    rootserver->h_name="";
+    if ( 1 != inet_pton(AF_INET, ROOTSERVER_IP, &rootserver_addr))
+    {
+      #if DEBUG_RESOLVER
+        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Could not transform root nameserver ip addressr\n");
+      #endif
+      GNUNET_break (0); 
+    }
+    
+    rootserver = gethostbyaddr(&rootserver_addr, sizeof(rootserver_addr), AF_INET);
+    if (rootserver == NULL)
+    {
+      // Error: resolving ip addresses does not work
+      #if DEBUG_RESOLVER
+      switch (h_errno)
+        {
+        
+        case HOST_NOT_FOUND: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "gethostbyaddr() could not lookup ip address: HOST_NOT_FOUND\n");break;
+        case NO_ADDRESS: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "gethostbyaddr() could not lookup ip address: NO_ADDRESS\n");break;
+        case NO_RECOVERY: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "gethostbyaddr() could not lookup ip address: NO_RECOVERY\n");break;
+        case TRY_AGAIN: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "gethostbyaddr() could not lookup ip address: TRY_AGAIN\n");break;
+        }
+      #endif
+      GNUNET_break (0);
+    }
+
+    if ( 0 != strcmp( rootserver->h_name,ROOTSERVER_NAME))
+    {
+      #if DEBUG_RESOLVER
+        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received hostname and hostname for root name server differ\n");
+      #endif
+      GNUNET_break (0); 
+    }
+    
+    #if DEBUG_RESOLVER
+        GNUNET_log (GNUNET_ERROR_TYPE_INFO, "System's own reverse name resolution is working\n");
+    #endif
+    // Resolve the same using GNUNET
+   
+    memset (&sa, 0, sizeof (sa));
+    sa.sin_family = AF_INET;
+    inet_aton(ROOTSERVER_IP, &sa.sin_addr.s_addr);
+    
+    GNUNET_RESOLVER_hostname_get (sched,
+                                cfg,
+                                (const struct sockaddr *) &sa,
+                                sizeof (struct sockaddr),
+                                GNUNET_YES,
+                                timeout, &check_rootserver_name, cls);
+    
+    // Success: reverse lookups work as exptected    
+  } 
 }
 
 static int