initial tree

1 files changed, 35 insertions, 0 deletions

diff --git a/entropy.c b/entropy.c
new file mode 100644
index 0000000..4a5d846
--- /dev/null
+++ b/entropy.c
@@ -0,0 +1,35 @@
+#include <string.h>
+#include <stdio.h>
+#include "common.h"
+
+int entropy(int argc, char **argv) {
+	FILE *f;
+	int entropy;
+	if(argc > 1) {
+		if(!strcmp(argv[1], "config")) {
+			puts("graph_title Available entropy\n"
+				"graph_args --base 1000 -l 0\n"
+				"graph_vlabel entropy (bytes)\n"
+				"graph_scale no\n"
+				"graph_category system\n"
+				"graph_info This graph shows the amount of entropy available in the system.\n"
+				"entropy.label entropy\n"
+				"entropy.info The number of random bytes available. This is typically used by cryptographic applications.");
+			return 0;
+		}
+		if(!strcmp(argv[1], "autoconf"))
+			return writeyes();
+	}
+	if(!(f=fopen("/proc/sys/kernel/random/entropy_avail", "r"))) {
+		fputs("cannot open /proc/sys/kernel/random/entropy_avail\n", stderr);
+		return 1;
+	}
+	if(1 != fscanf(f, "%d", &entropy)) {
+		fputs("cannot read from /proc/sys/kernel/random/entropy_avail\n", stderr);
+		fclose(f);
+		return 1;
+	}
+	fclose(f);
+	printf("entropy.value %d\n", entropy);
+	return 0;
+}