Add support for $GNUNET_BASE_CONFIG

The environment variable GNUNET_BASE_CONFIG allows
specifying the directory from which all base config
files will be loaded.  This is useful when ARM is
to be used to supervise things otherwise unrelated to
GNUnet.  Modifying GNUNET_PREFIX is not sufficient
for this use case, since e.g. libexec files need
to be under GNUNET_PREFIX, and GNUNET_BASE_CONFIG
provides a way to only modify the base config
directory independent of where GNUnet was installed.

1 files changed, 20 insertions, 11 deletions

diff --git a/src/util/resolver_api.c b/src/util/resolver_api.c
index 3eff02c5c..f477c1369 100644
--- a/src/util/resolver_api.c
+++ b/src/util/resolver_api.c
@@ -171,8 +171,11 @@ struct GNUNET_RESOLVER_RequestHandle
 /**
  * Check that the resolver service runs on localhost
  * (or equivalent).
+ *
+ * @return #GNUNET_OK if the resolver is properly configured,
+ *         #GNUNET_SYSERR otherwise.
  */
-static void
+static int
 check_config ()
 {
   char *hostname;
@@ -197,32 +200,32 @@ check_config ()
                                              "HOSTNAME",
                                              &hostname))
   {
-    LOG (GNUNET_ERROR_TYPE_ERROR,
-         _("Must specify `%s' for `%s' in configuration!\n"),
+    LOG (GNUNET_ERROR_TYPE_INFO,
+         _("Missing `%s' for `%s' in configuration, DNS resolution will be unavailable.\n"),
          "HOSTNAME",
          "resolver");
-    GNUNET_assert (0);
+    return GNUNET_SYSERR;
   }
   if ((1 != inet_pton (AF_INET, hostname, &v4)) ||
       (1 != inet_pton (AF_INET6, hostname, &v6)))
   {
     GNUNET_free (hostname);
-    return;
+    return GNUNET_SYSERR;
   }
   i = 0;
   while (NULL != loopback[i])
     if (0 == strcasecmp (loopback[i++], hostname))
     {
       GNUNET_free (hostname);
-      return;
+      return GNUNET_OK;
     }
-  LOG (GNUNET_ERROR_TYPE_ERROR,
-       _("Must specify `%s' or numeric IP address for `%s' of `%s' in configuration!\n"),
+  LOG (GNUNET_ERROR_TYPE_INFO,
+       _("Missing `%s' or numeric IP address for `%s' of `%s' in configuration, DNS resolution will be unavailable.\n"),
        "localhost",
        "HOSTNAME",
        "resolver");
   GNUNET_free (hostname);
-  GNUNET_assert (0);
+  return GNUNET_SYSERR;
 }
 
 
@@ -237,7 +240,7 @@ GNUNET_RESOLVER_connect (const struct GNUNET_CONFIGURATION_Handle *cfg)
   GNUNET_assert (NULL != cfg);
   backoff = GNUNET_TIME_UNIT_MILLISECONDS;
   resolver_cfg = cfg;
-  check_config ();
+  (void) check_config ();
 }
 
 
@@ -951,7 +954,13 @@ GNUNET_RESOLVER_hostname_get (const struct sockaddr *sa,
   size_t ip_len;
   const void *ip;
 
-  check_config ();
+  if (GNUNET_OK != check_config ())
+  {
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+         _("Resolver not configured correctly.\n"));
+    return NULL;
+  }
+
   switch (sa->sa_family)
   {
   case AF_INET: