From 38d2cfe4fc1f9253d2938052b817921e6c27aa5b Mon Sep 17 00:00:00 2001
From: Sree Harsha Totakura <totakura@in.tum.de>
Date: Mon, 13 May 2013 20:22:01 +0000
Subject: - resolve hostname in helper to IP address

---
 src/testbed/gnunet-helper-testbed.c | 58 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 57 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/testbed/gnunet-helper-testbed.c b/src/testbed/gnunet-helper-testbed.c
index be9154fdc..43766796e 100644
--- a/src/testbed/gnunet-helper-testbed.c
+++ b/src/testbed/gnunet-helper-testbed.c
@@ -58,6 +58,12 @@
 #define LOG_DEBUG(...)                          \
   LOG (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
 
+/**
+ * Log an error message at log-level 'level' that indicates a failure of the
+ * command 'cmd' with the message given by gai_strerror(rc).
+ */
+#define LOG_GAI(level, cmd, rc) do { LOG(level, _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, gai_strerror(rc)); } while(0)
+
 
 /**
  * We need pipe control only on WINDOWS
@@ -312,6 +318,48 @@ child_death_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 }
 
 
+/**
+ * Resolves a hostname using getaddrinfo
+ *
+ * @param host the hostname
+ * @return the string representing the IPv4 address of the given host; NULL upon error
+ */
+const char *
+simple_resolve (const char *host)
+{
+  struct addrinfo *res;
+  const struct sockaddr_in *in_addr; 
+  char *hostip;
+  struct addrinfo hint;
+  unsigned int rc;
+
+  hint.ai_family = AF_INET;	/* IPv4 */
+  hint.ai_socktype = 0;
+  hint.ai_protocol = 0;
+  hint.ai_addrlen = 0;
+  hint.ai_addr = NULL;
+  hint.ai_canonname = NULL;
+  hint.ai_next = NULL;
+  hint.ai_flags = AI_NUMERICSERV;
+  res = NULL;
+  LOG_DEBUG ("Resolving [%s]\n", host);
+  if (0 != (rc = getaddrinfo (host, "22", &hint, &res)))
+  {
+    LOG_GAI (GNUNET_ERROR_TYPE_ERROR, "getaddrinfo", rc);
+    return NULL;
+  }
+  GNUNET_assert (NULL != res);
+  GNUNET_assert (NULL != res->ai_addr);
+  GNUNET_assert (sizeof (struct sockaddr_in) == res->ai_addrlen);
+  in_addr = (const struct sockaddr_in *) res->ai_addr;
+  hostip = inet_ntoa (in_addr->sin_addr);
+  GNUNET_assert (NULL != hostip);
+  freeaddrinfo (res);
+  LOG_DEBUG ("Resolved [%s] to [%s]\n", host, hostip);
+  return hostip;
+}
+
+
 /**
  * Functions with this signature are called whenever a
  * complete message is received by the tokenizer.
@@ -335,6 +383,7 @@ tokenizer_cb (void *cls, void *client,
   char *binary;
   char *trusted_ip;
   char *hostname;
+  const char *hostip;
   char *config;
   char *xconfig;
   size_t config_size;
@@ -400,10 +449,17 @@ tokenizer_cb (void *cls, void *client,
                     hostname_size);
     hostname[hostname_size] = '\0';
   }
+  hostip = NULL;
+  if ( (NULL != hostname) && (NULL == (hostip = simple_resolve (hostname))) )
+  {
+    GNUNET_free (hostname);
+    hostname = NULL;
+  }  
   test_system =
-      GNUNET_TESTING_system_create ("testbed-helper", trusted_ip, hostname, NULL);
+      GNUNET_TESTING_system_create ("testbed-helper", trusted_ip, hostip, NULL);
   GNUNET_free_non_null (hostname);
   hostname = NULL;
+  hostip = NULL;
   GNUNET_assert (NULL != test_system);
   GNUNET_assert (GNUNET_OK ==
                  GNUNET_TESTING_configuration_create (test_system, cfg));
-- 
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