[src/trunk]: src/usr.bin/skeyinit Filter out non-alpha-numeric characters fro...

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/bf2d03f31f1b
branches:  trunk
changeset: 495467:bf2d03f31f1b
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Fri Jul 28 19:19:23 2000 +0000

description:
Filter out non-alpha-numeric characters from the default
seed.  No point in generating one that skey(1) will reject.

diffstat:

 usr.bin/skeyinit/skeyinit.c |  17 +++++++++++++++--
 1 files changed, 15 insertions(+), 2 deletions(-)

diffs (31 lines):

diff -r 2a0d5aeff0d6 -r bf2d03f31f1b usr.bin/skeyinit/skeyinit.c
--- a/usr.bin/skeyinit/skeyinit.c       Fri Jul 28 19:17:02 2000 +0000
+++ b/usr.bin/skeyinit/skeyinit.c       Fri Jul 28 19:19:23 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: skeyinit.c,v 1.13 2000/07/07 00:18:29 mjl Exp $        */
+/*     $NetBSD: skeyinit.c,v 1.14 2000/07/28 19:19:23 thorpej Exp $    */
 
 /* S/KEY v1.1b (skeyinit.c)
  *
@@ -58,7 +58,20 @@
 
        if (gethostname(hostname, sizeof(hostname)) < 0)
                err(1, "gethostname");
-       (void)strncpy(defaultseed, hostname, sizeof(defaultseed)- 1);
+
+       /*
+        * Copy the hostname into the default seed, eliminating any
+        * non alpha-numeric characters.
+        */
+       for (i = 0, l = 0; l < sizeof(defaultseed); i++) {
+               if (hostname[i] == '\0') {
+                       defaultseed[l] = hostname[i];
+                       break;
+               }
+               if (isalnum(hostname[i]))
+                       defaultseed[l++] = hostname[i];
+       }
+
        defaultseed[SKEY_NAMELEN] = '\0';
        (void)time(&now);
        (void)sprintf(tbuf, "%05ld", (long) (now % 100000));