diff options
| author | Niels Provos <provos@cvs.openbsd.org> | 1997-04-13 21:30:48 +0000 |
|---|---|---|
| committer | Niels Provos <provos@cvs.openbsd.org> | 1997-04-13 21:30:48 +0000 |
| commit | 4f2373a733380e881cb67eb81b13a40a946fb42a (patch) | |
| tree | 7df37496bce32e7bd9202014f0ddb8e6c64ddb15 /lib/libc/net/res_mkquery.c | |
| parent | a836b0197367e41c79e368e58058710e6dc219ae (diff) | |
the before mentioned random number generator.
Diffstat (limited to 'lib/libc/net/res_mkquery.c')
| -rw-r--r-- | lib/libc/net/res_mkquery.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/lib/libc/net/res_mkquery.c b/lib/libc/net/res_mkquery.c index 5faba01748d..2c244c24fc8 100644 --- a/lib/libc/net/res_mkquery.c +++ b/lib/libc/net/res_mkquery.c @@ -1,4 +1,4 @@ -/* $OpenBSD: res_mkquery.c,v 1.6 1997/03/13 19:07:39 downsj Exp $ */ +/* $OpenBSD: res_mkquery.c,v 1.7 1997/04/13 21:30:46 provos Exp $ */ /* * ++Copyright++ 1985, 1993 @@ -60,7 +60,7 @@ static char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93"; static char rcsid[] = "$From: res_mkquery.c,v 8.5 1996/08/27 08:33:28 vixie Exp $"; #else -static char rcsid[] = "$OpenBSD: res_mkquery.c,v 1.6 1997/03/13 19:07:39 downsj Exp $"; +static char rcsid[] = "$OpenBSD: res_mkquery.c,v 1.7 1997/04/13 21:30:46 provos Exp $"; #endif #endif /* LIBC_SCCS and not lint */ @@ -106,12 +106,17 @@ res_mkquery(op, dname, class, type, data, datalen, newrr_in, buf, buflen) #endif /* * Initialize header fields. + * + * A special random number generator is used to create non predictable + * and non repeating ids over a long period. It also avoids reuse + * by switching between two distinct number cycles. */ + if ((buf == NULL) || (buflen < HFIXEDSZ)) return (-1); bzero(buf, HFIXEDSZ); hp = (HEADER *) buf; - hp->id = htons(++_res.id); + hp->id = htons(_res.id=res_randomid()); hp->opcode = op; hp->rd = (_res.options & RES_RECURSE) != 0; hp->rcode = NOERROR; |