[Csync2] generating pre-shared keys very slow

[Christian Wiese]

Hi again,

I found the issue, and now I do not really wonder about the very slow
operation of 'csync2 -k foo.key' because '/dev/random' is used as
entropy source even while having '/dev/urandom' available.

If I use following quick and dirty patch, 'csync2 -k foo.key' works
much faster than before, returning a key immediately and not after
minutes.

Cheers,
Chris

-----------------------------snip----------------------------------------
--- csync2.c.orig       2008-12-17 15:57:19.000000000 +0100
+++ csync2.c    2008-12-17 15:57:57.000000000 +0100
@@ -190,7 +190,7 @@
 int create_keyfile(const char *filename)
 {
        int fd = open(filename, O_WRONLY|O_CREAT|O_EXCL, 0600);
-       int rand = open("/dev/random", O_RDONLY);
+       int rand = open("/dev/urandom", O_RDONLY);
        char matrix[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789._";
unsigned char n; int i;
@@ -201,7 +201,7 @@
                return 1;
        }
        if ( rand == -1 ) {
-               fprintf(stderr, "Can't open /dev/random: %s\n",
strerror(errno));
+               fprintf(stderr, "Can't open /dev/urandom: %s\n",
strerror(errno)); return 1;
        }
        for (i=0; i<64; i++) {
-----------------------------snip----------------------------------------

Am Wed, 17 Dec 2008 14:49:53 +0100
schrieb Christian Wiese <morfoh at opensde.org>:

> Hi,
> 
> I am really wondering why 'csync2 -k keyfile' is dog slow on every
> system I tested it. I doubt that it is supposed to be normal
> operations, that generating a key takes > 30min. 
> 
> Cheers,
> Chris
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