X-Git-Url: https://git.octo.it/?p=collectd.git;a=blobdiff_plain;f=src%2Fdaemon%2Fcommon.c;h=45f9d533540c7e07626674242990cd7502c1729d;hp=b60530a18304d858c7334d8257b133b158467ef5;hb=08cf386cb8aa711ef4043d9139d464b38188a44b;hpb=1bdfcf9791729310f75857d0e002c40ef659a89b

diff --git a/src/daemon/common.c b/src/daemon/common.c
index b60530a1..45f9d533 100644
--- a/src/daemon/common.c
+++ b/src/daemon/common.c
@@ -51,11 +51,19 @@
 # include <netinet/in.h>
 #endif
 
+#if HAVE_NETINET_TCP_H
+# include <netinet/tcp.h>
+#endif
+
 /* for ntohl and htonl */
 #if HAVE_ARPA_INET_H
 # include <arpa/inet.h>
 #endif
 
+#ifdef HAVE_SYS_CAPABILITY_H
+# include <sys/capability.h>
+#endif
+
 #ifdef HAVE_LIBKSTAT
 extern kstat_ctl_t *kc;
 #endif
@@ -1557,6 +1565,46 @@ int service_name_to_port_number (const char *service_name)
 	return (-1);
 } /* int service_name_to_port_number */
 
+void set_sock_opts (int sockfd) /* {{{ */
+{
+	int status;
+	int socktype;
+
+	socklen_t socklen = sizeof (socklen_t);
+	int so_keepalive = 1;
+
+	status = getsockopt (sockfd, SOL_SOCKET, SO_TYPE, &socktype, &socklen);
+	if (status != 0)
+	{
+		WARNING ("set_sock_opts: failed to determine socket type");
+		return;
+	}
+
+	if (socktype == SOCK_STREAM)
+	{
+		status = setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE,
+				&so_keepalive, sizeof (so_keepalive));
+		if (status != 0)
+			WARNING ("set_sock_opts: failed to set socket keepalive flag");
+
+#ifdef TCP_KEEPIDLE
+		int tcp_keepidle = ((CDTIME_T_TO_MS(plugin_get_interval()) - 1) / 100 + 1);
+		status = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPIDLE,
+				&tcp_keepidle, sizeof (tcp_keepidle));
+		if (status != 0)
+			WARNING ("set_sock_opts: failed to set socket tcp keepalive time");
+#endif
+
+#ifdef TCP_KEEPINTVL
+		int tcp_keepintvl = ((CDTIME_T_TO_MS(plugin_get_interval()) - 1) / 1000 + 1);
+		status = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPINTVL,
+				&tcp_keepintvl, sizeof (tcp_keepintvl));
+		if (status != 0)
+			WARNING ("set_sock_opts: failed to set socket tcp keepalive interval");
+#endif
+	}
+} /* }}} void set_sock_opts */
+
 int strtoderive (const char *string, derive_t *ret_value) /* {{{ */
 {
 	derive_t tmp;
@@ -1624,3 +1672,52 @@ void strarray_free (char **array, size_t array_len) /* {{{ */
 		sfree (array[i]);
 	sfree (array);
 } /* }}} void strarray_free */
+
+#ifdef HAVE_SYS_CAPABILITY_H
+int check_capability (int capability) /* {{{ */
+{
+#ifdef _LINUX_CAPABILITY_VERSION_3
+	cap_user_header_t cap_header = calloc(sizeof (*cap_header), 1);
+	if (cap_header == NULL)
+	{
+		ERROR("check_capability: calloc failed");
+		return (-1);
+	}
+
+	cap_user_data_t cap_data = calloc(sizeof (*cap_data), 1);
+	if (cap_data == NULL)
+	{
+		ERROR("check_capability: calloc failed");
+		sfree(cap_header);
+		return (-1);
+	}
+
+	cap_header->pid = getpid();
+	cap_header->version = _LINUX_CAPABILITY_VERSION;
+	if (capget(cap_header, cap_data) < 0)
+	{
+		ERROR("check_capability: capget failed");
+		sfree(cap_header);
+		sfree(cap_data);
+		return (-1);
+	}
+
+	if ((cap_data->effective & (1 << capability)) == 0)
+	{
+		sfree(cap_header);
+		sfree(cap_data);
+		return (-1);
+	}
+	else
+	{
+		sfree(cap_header);
+		sfree(cap_data);
+		return (0);
+	}
+#else
+	WARNING ("check_capability: unsupported capability implementation. "
+	    "Some plugin(s) may require elevated privileges to work properly.");
+	return (0);
+#endif /* _LINUX_CAPABILITY_VERSION_3 */
+} /* }}} int check_capability */
+#endif /* HAVE_SYS_CAPABILITY_H */