collectd: The new `FQDNLookup' option controls whether or not the FQDN should be...

[collectd.git] / src / collectd.c

diff --git a/src/collectd.c b/src/collectd.c
index 4e18fd6..70223b7 100644 (file)
--- a/src/collectd.c
+++ b/src/collectd.c
@@ -23,6 +23,10 @@
 #include "collectd.h"
 #include "common.h"
 
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+
 #include "plugin.h"
 #include "configfile.h"
 #include "types_list.h"
@@ -48,25 +52,63 @@ static void sigTermHandler (int signal)
        loop++;
 }
 
-static int init_global_variables (void)
+static int init_hostname (void)
 {
        const char *str;
 
+       struct addrinfo  ai_hints;
+       struct addrinfo *ai_list;
+       struct addrinfo *ai_ptr;
+       int status;
+
        str = global_option_get ("Hostname");
        if (str != NULL)
        {
                strncpy (hostname_g, str, sizeof (hostname_g));
+               hostname_g[sizeof (hostname_g) - 1] = '\0';
+               return (0);
        }
-       else
+
+       if (gethostname (hostname_g, sizeof (hostname_g)) != 0)
        {
-               if (gethostname (hostname_g, sizeof (hostname_g)) != 0)
-               {
-                       fprintf (stderr, "`gethostname' failed and no "
-                                       "hostname was configured.\n");
-                       return (-1);
-               }
+               fprintf (stderr, "`gethostname' failed and no "
+                               "hostname was configured.\n");
+               return (-1);
+       }
+
+       str = global_option_get ("FQDNLookup");
+       if ((strcasecmp ("false", str) == 0)
+                       || (strcasecmp ("no", str) == 0)
+                       || (strcasecmp ("off", str) == 0))
+               return (0);
+
+       memset (&ai_hints, '\0', sizeof (ai_hints));
+       ai_hints.ai_flags = AI_CANONNAME;
+
+       status = getaddrinfo (hostname_g, NULL, &ai_hints, &ai_list);
+       if (status != 0)
+       {
+               ERROR ("getaddrinfo failed.");
+               return (-1);
        }
-       DEBUG ("hostname_g = %s;", hostname_g);
+
+       for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
+       {
+               if (ai_ptr->ai_canonname == NULL)
+                       continue;
+
+               strncpy (hostname_g, ai_ptr->ai_canonname, sizeof (hostname_g));
+               hostname_g[sizeof (hostname_g) - 1] = '\0';
+               break;
+       }
+
+       freeaddrinfo (ai_list);
+       return (0);
+} /* int init_hostname */
+
+static int init_global_variables (void)
+{
+       const char *str;
 
        str = global_option_get ("Interval");
        if (str == NULL)
@@ -80,6 +122,10 @@ static int init_global_variables (void)
        }
        DEBUG ("interval_g = %i;", interval_g);
 
+       if (init_hostname () != 0)
+               return (-1);
+       DEBUG ("hostname_g = %s;", hostname_g);
+
        return (0);
 } /* int init_global_variables */