1 files changed, 39 insertions, 0 deletions
diff --git a/src/lxc/caps.c b/src/lxc/caps.c
index 1610002..10a0b4a 100644
--- a/src/lxc/caps.c
+++ b/src/lxc/caps.c
@@ -213,3 +213,42 @@ int lxc_caps_last_cap(void)
 
 	return last_cap;
 }
+
+/*
+ * check if we have the caps needed to start a container.  returns 1 on
+ * success, 0 on error.  (I'd prefer this be a bool, but am afraid that
+ * might fail to build on some distros).
+ */
+int lxc_caps_check(void)
+{
+	uid_t uid = getuid();
+	cap_t caps;
+	cap_flag_value_t value;
+	int i, ret;
+
+	cap_value_t needed_caps[] = { CAP_SYS_ADMIN, CAP_NET_ADMIN, CAP_SETUID, CAP_SETGID };
+
+#define NUMCAPS ((int) (sizeof(needed_caps) / sizeof(cap_t)))
+
+	if (!uid)
+		return 1;
+
+	caps = cap_get_proc();
+	if (!caps) {
+		ERROR("failed to cap_get_proc: %m");
+		return 0;
+	}
+
+	for (i=0; i<NUMCAPS; i++) {
+		ret = cap_get_flag(caps, needed_caps[i], CAP_EFFECTIVE, &value);
+		if (ret) {
+			ERROR("Failed to cap_get_flag: %m");
+			return 0;
+		}
+		if (!value) {
+			return 0;
+		}
+	}
+
+	return 1;
+}