From 8f0658b93c8fe2b7d243a6cd38cd569a9f24101f Mon Sep 17 00:00:00 2001
From: Heikki Lindholm <holin@iki.fi>
Date: Fri, 9 Apr 2010 20:24:34 +0000
Subject: [PATCH] rehash since gethostname is used in resolver as well

---
 src/hostlist/hostlist-server.c | 19 ++-----------------
 src/include/gnunet_os_lib.h    | 12 ++++++++++++
 src/util/resolver_api.c        |  3 ++-
 3 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/src/hostlist/hostlist-server.c b/src/hostlist/hostlist-server.c
index f3f92e9fb..6b3526926 100644
--- a/src/hostlist/hostlist-server.c
+++ b/src/hostlist/hostlist-server.c
@@ -104,11 +104,6 @@ struct HostSet
   char *data;
 };
 
-/**
- * Local max hostname length (some platforms use sysconf() for it)
- */
-static int max_hostname_length;
-
 /**
  * Task that will produce a new response object.
  */
@@ -405,11 +400,11 @@ adv_create_message ( const struct GNUNET_PeerIdentity * peer,
   unsigned long long port;
 
   char *uri;
-  char hostname[max_hostname_length + 1];
+  char hostname[GNUNET_OS_get_hostname_max_length() + 1];
   char *protocol = "http://";
   char *port_s = GNUNET_malloc(6 * sizeof(char));
 
-  if (0 != gethostname (hostname, sizeof (hostname)))
+  if (0 != gethostname (hostname, sizeof (hostname) - 1))
   {
     GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
         "Could not get system's hostname, unable to create advertisement message");
@@ -618,16 +613,6 @@ GNUNET_HOSTLIST_server_start (const struct GNUNET_CONFIGURATION_Handle *c,
 {
   unsigned long long port;
 
-#if HAVE_SYSCONF && defined(_SC_HOST_NAME_MAX)
-  max_hostname_length = sysconf(_SC_HOST_NAME_MAX);
-  if (-1 == max_hostname_length)
-    return GNUNET_SYSERR;
-#elif defined(HOST_NAME_MAX)
-  max_hostname_length = HOST_NAME_MAX;
-#else
-  max_hostname_length = 255; /* sensible default? */
-#endif
-
   sched = s;
   cfg = c;
   stats = st;
diff --git a/src/include/gnunet_os_lib.h b/src/include/gnunet_os_lib.h
index 32d9dc7ff..3aa1f1bad 100644
--- a/src/include/gnunet_os_lib.h
+++ b/src/include/gnunet_os_lib.h
@@ -154,6 +154,18 @@ typedef int (*GNUNET_OS_NetworkInterfaceProcessor) (void *cls,
 void GNUNET_OS_network_interfaces_list (GNUNET_OS_NetworkInterfaceProcessor
                                         proc, void *proc_cls);
 
+/**
+ * @brief Get maximum string length returned by gethostname()
+ */
+#if HAVE_SYSCONF && defined(_SC_HOST_NAME_MAX)
+#define GNUNET_OS_get_hostname_max_length() ({ int __sc_tmp = sysconf(_SC_HOST_NAME_MAX); __sc_tmp <= 0 ? 255 : __sc_tmp; })
+#elif defined(HOST_NAME_MAX)
+#define GNUNET_OS_get_hostname_max_length() HOST_NAME_MAX
+#else
+#define GNUNET_OS_get_hostname_max_length() 255
+#endif
+
+
 /**
  * Get the current CPU load.
  *
diff --git a/src/util/resolver_api.c b/src/util/resolver_api.c
index ecd3789f4..a35f680d3 100644
--- a/src/util/resolver_api.c
+++ b/src/util/resolver_api.c
@@ -25,6 +25,7 @@
  */
 #include "platform.h"
 #include "gnunet_getopt_lib.h"
+#include "gnunet_os_lib.h"
 #include "gnunet_client_lib.h"
 #include "gnunet_protocols.h"
 #include "gnunet_resolver_service.h"
@@ -686,7 +687,7 @@ GNUNET_RESOLVER_hostname_resolve (struct GNUNET_SCHEDULER_Handle *sched,
                                   GNUNET_RESOLVER_AddressCallback callback,
                                   void *cls)
 {
-  char hostname[MAX_HOSTNAME];
+  char hostname[GNUNET_OS_get_hostname_max_length() + 1];
 
   check_config (cfg);
   if (0 != gethostname (hostname, sizeof (hostname) - 1))
-- 
2.25.1