X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fdns.c;h=0494b4baeb20494f3a00fdb629eb2d738b637077;hb=d782a871aca61ac966ee8d928930719bd0c05023;hp=e23a2bb21b343b3dd37ae3a7f20e7ac77a496de3;hpb=7dcf9ab7675fe91d1bd74998f55031bc3b0480c0;p=collectd.git

diff --git a/src/dns.c b/src/dns.c
index e23a2bb2..0494b4ba 100644
--- a/src/dns.c
+++ b/src/dns.c
@@ -34,6 +34,10 @@
 
 #include <pcap.h>
 
+#ifdef HAVE_SYS_CAPABILITY_H
+# include <sys/capability.h>
+#endif
+
 /*
  * Private data types
  */
@@ -346,6 +350,20 @@ static int dns_init (void)
 
 	listen_thread_init = 1;
 
+#if defined(HAVE_SYS_CAPABILITY_H) && defined(CAP_NET_RAW)
+	if (check_capability (CAP_NET_RAW) != 0)
+	{
+		if (getuid () == 0)
+			WARNING ("dns plugin: Running collectd as root, but the CAP_NET_RAW "
+					"capability is missing. The plugin's read function will probably "
+					"fail. Is your init system dropping capabilities?");
+		else
+			WARNING ("dns plugin: collectd doesn't have the CAP_NET_RAW capability. "
+					"If you don't want to run collectd as root, try running \"setcap "
+					"cap_net_raw=ep\" on the collectd binary.");
+	}
+#endif
+
 	return (0);
 } /* int dns_init */