diff options
Diffstat (limited to 'contrib/bind/named/ns_sort.c')
| -rw-r--r-- | contrib/bind/named/ns_sort.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/contrib/bind/named/ns_sort.c b/contrib/bind/named/ns_sort.c new file mode 100644 index 000000000000..0f53ccec658d --- /dev/null +++ b/contrib/bind/named/ns_sort.c @@ -0,0 +1,171 @@ +#if !defined(lint) && !defined(SABER) +static char sccsid[] = "@(#)ns_sort.c 4.10 (Berkeley) 3/3/91"; +static char rcsid[] = "$Id: ns_sort.c,v 8.3 1995/12/22 10:20:30 vixie Exp $"; +#endif /* not lint */ + +/* + * ++Copyright++ 1986, 1990 + * - + * Copyright (c) 1986, 1990 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * - + * Portions Copyright (c) 1993 by Digital Equipment Corporation. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies, and that + * the name of Digital Equipment Corporation not be used in advertising or + * publicity pertaining to distribution of the document or software without + * specific, written prior permission. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL + * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT + * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL + * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR + * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS + * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS + * SOFTWARE. + * - + * --Copyright-- + */ + +#include <sys/param.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/file.h> +#include <netinet/in.h> +#include <arpa/nameser.h> +#include <arpa/inet.h> +#include <stdio.h> +#include <syslog.h> +#include <resolv.h> + +#include "named.h" + +static int sort_rr __P((u_char *cp, int count, struct netinfo *ntp, u_char *eom)); + +#ifdef SORT_RESPONSE +struct netinfo * +local(from) + struct sockaddr_in *from; +{ + struct netinfo *ntp; + + if (from->sin_addr.s_addr == netloop.my_addr.s_addr) + return (&netloop); + for (ntp = nettab; ntp != *enettab; ntp = ntp->next) { + if (ntp->addr == (from->sin_addr.s_addr & ntp->mask)) + return (ntp); + } + return (NULL); +} + +void +sort_response(cp, ancount, lp, eom) + register u_char *cp; + register int ancount; + struct netinfo *lp; + u_char *eom; +{ + register struct netinfo *ntp; + + dprintf(3, (ddt, "sort_response(%d)\n", ancount)); + if (ancount > 1) { + if (sort_rr(cp, ancount, lp, eom)) + return; + for (ntp = nettab; ntp != NULL; ntp = ntp->next) { + if ((ntp->addr == lp->addr) && (ntp->mask == lp->mask)) + continue; + if (sort_rr(cp, ancount, ntp, eom)) + break; + } + } +} + +static int +sort_rr(cp, count, ntp, eom) + register u_char *cp; + int count; + register struct netinfo *ntp; + u_char *eom; +{ + int type, class, dlen, n, c; + struct in_addr inaddr; + u_char *rr1; + +#ifdef DEBUG + if (debug > 2) { + inaddr.s_addr = ntp->addr; + fprintf(ddt, "sort_rr(%#lx, %d, [%s])\n", + (u_long)cp, count, inet_ntoa(inaddr)); + } +#endif + rr1 = NULL; + for (c = count; c > 0; --c) { + n = dn_skipname(cp, eom); + if (n < 0) + return (1); /* bogus, stop processing */ + cp += n; + if (cp + QFIXEDSZ > eom) + return (1); + GETSHORT(type, cp); + GETSHORT(class, cp); + cp += INT32SZ; + GETSHORT(dlen, cp); + if (dlen > eom - cp) + return (1); /* bogus, stop processing */ + switch (type) { + case T_A: + switch (class) { + case C_IN: + case C_HS: + bcopy(cp, (char *)&inaddr, INADDRSZ); + if (rr1 == NULL) + rr1 = cp; + if ((ntp->mask & inaddr.s_addr) == ntp->addr) { + dprintf(2, (ddt,"net [%s] best choice\n", + inet_ntoa(inaddr))); + if (rr1 != cp) { + bcopy(rr1, cp, INADDRSZ); + bcopy((char *)&inaddr, rr1, INADDRSZ); + } + return (1); + } + break; + } + break; + } + cp += dlen; + } + return (0); +} +#endif |