140 lines
4.4 KiB
C
140 lines
4.4 KiB
C
/*
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* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Kungliga Tekniska
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* Högskolan and its contributors.
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*
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* 4. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb_locl.h"
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RCSID("$Id: lsb_addr_comp.c,v 1.15 1998/10/22 15:58:26 joda Exp $");
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#include "krb-archaeology.h"
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int
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krb_lsb_antinet_ulong_cmp(u_int32_t x, u_int32_t y)
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{
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int i;
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u_int32_t a = 0, b = 0;
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u_int8_t *p = (u_int8_t*) &x;
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u_int8_t *q = (u_int8_t*) &y;
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for(i = sizeof(u_int32_t) - 1; i >= 0; i--){
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a = (a << 8) | p[i];
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b = (b << 8) | q[i];
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}
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if(a > b)
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return 1;
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if(a < b)
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return -1;
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return 0;
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}
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int
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krb_lsb_antinet_ushort_cmp(u_int16_t x, u_int16_t y)
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{
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int i;
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u_int16_t a = 0, b = 0;
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u_int8_t *p = (u_int8_t*) &x;
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u_int8_t *q = (u_int8_t*) &y;
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for(i = sizeof(u_int16_t) - 1; i >= 0; i--){
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a = (a << 8) | p[i];
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b = (b << 8) | q[i];
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}
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if(a > b)
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return 1;
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if(a < b)
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return -1;
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return 0;
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}
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u_int32_t
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lsb_time(time_t t, struct sockaddr_in *src, struct sockaddr_in *dst)
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{
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int dir = 1;
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const char *fw;
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/*
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* direction bit is the sign bit of the timestamp. Ok until
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* 2038??
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*/
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if(krb_debug) {
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krb_warning("lsb_time: src = %s:%u\n",
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inet_ntoa(src->sin_addr), ntohs(src->sin_port));
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krb_warning("lsb_time: dst = %s:%u\n",
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inet_ntoa(dst->sin_addr), ntohs(dst->sin_port));
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}
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/* For compatibility with broken old code, compares are done in VAX
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byte order (LSBFIRST) */
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if (krb_lsb_antinet_ulong_less(src->sin_addr.s_addr, /* src < recv */
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dst->sin_addr.s_addr) < 0)
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dir = -1;
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else if (krb_lsb_antinet_ulong_less(src->sin_addr.s_addr,
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dst->sin_addr.s_addr)==0)
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if (krb_lsb_antinet_ushort_less(src->sin_port, dst->sin_port) < 0)
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dir = -1;
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/*
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* all that for one tiny bit! Heaven help those that talk to
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* themselves.
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*/
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if(krb_get_config_bool("reverse_lsb_test")) {
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if(krb_debug)
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krb_warning("lsb_time: reversing direction: %d -> %d\n", dir, -dir);
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dir = -dir;
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}else if((fw = krb_get_config_string("firewall_address"))) {
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struct in_addr fw_addr;
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fw_addr.s_addr = inet_addr(fw);
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if(fw_addr.s_addr != INADDR_NONE) {
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int s_lt_d, d_lt_f;
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krb_warning("lsb_time: fw = %s\n", inet_ntoa(fw_addr));
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/* negate if src < dst < fw || fw < dst < src */
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s_lt_d = (krb_lsb_antinet_ulong_less(src->sin_addr.s_addr,
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dst->sin_addr.s_addr) == -1);
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d_lt_f = (krb_lsb_antinet_ulong_less(fw_addr.s_addr,
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dst->sin_addr.s_addr) == 1);
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if((s_lt_d ^ d_lt_f) == 0) {
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if(krb_debug)
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krb_warning("lsb_time: reversing direction: %d -> %d\n",
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dir, -dir);
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dir = -dir;
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}
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}
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}
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t = t * dir;
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t = t & 0xffffffff;
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return t;
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}
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