X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fdns.c;h=53128396232b848c34645010dcbc64d36eac1281;hb=448627953cde2f7b3b138f53f4f2c62f0d48b726;hp=15fa15a79099b1faf28af0a20ef9a629eacc2ad2;hpb=c7d859191d8fbfc129dea8cfaf9e13e78fd6642c;p=collectd.git

diff --git a/src/dns.c b/src/dns.c
index 15fa15a7..53128396 100644
--- a/src/dns.c
+++ b/src/dns.c
@@ -35,6 +35,10 @@
 
 #include <pcap.h>
 
+#ifdef HAVE_SYS_CAPABILITY_H
+# include <sys/capability.h>
+#endif
+
 /*
  * Private data types
  */
@@ -347,6 +351,20 @@ 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 */