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authorHelmut Grohne <helmut@subdivi.de>2008-06-21 11:33:06 +0000
committerHelmut Grohne <helmut@subdivi.de>2008-06-21 11:33:06 +0000
commitf481beb2dc4e6db37ea79f32960cbfa4a148eb90 (patch)
tree9c1f37c19b727d34fd8ab23e6e10b8866d46bb43 /entropy.c
downloadmunin-plugins-busybox-f481beb2dc4e6db37ea79f32960cbfa4a148eb90.tar.gz
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Diffstat (limited to 'entropy.c')
-rw-r--r--entropy.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/entropy.c b/entropy.c
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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;
+}