69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
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/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <libc.h>
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#include <ip.h>
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/* from the kernel. Sorry. */
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enum {
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Nipht = 521, /* convenient prime */
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};
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/* Jehanne iphash() from ip/ipaux.c */
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uint32_t
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iphash(uint8_t *sa, uint16_t sp, uint8_t *da, uint16_t dp)
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{
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return (((uint32_t)(sa[IPaddrlen-1])<<24) ^ (sp << 16) ^ (((uint32_t)da[IPaddrlen-1])<<8) ^ dp ) % Nipht;
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}
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/* old Nix iphash (worked with kenc) */
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uint32_t oldiphash(uint8_t * sa, uint16_t sp, uint8_t * da, uint16_t dp)
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{
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return ((sa[IPaddrlen - 1] << 24) ^ (sp << 16) ^ (da[IPaddrlen - 1] << 8) ^
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dp) % Nipht;
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}
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/* conventions.
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* informational messages go on fd 2.
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* PASS/FAIL go on fd 1 and there is only ever one of each.
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* The first four characters of passing tests are PASS
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* The first four characters of failing tests are FAIL
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* It is an error to print both PASS and FAIL
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* FAIL tests should exits() with a message
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* We may consider not printing PASS/FAIL and using exits instead.
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*/
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void
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main()
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{
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static uint8_t sa[IPaddrlen] = { 0x80, };
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static uint8_t da[IPaddrlen];
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uint16_t sp = 4;
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uint16_t dp = 5;
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uint32_t ohash, nhash;
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sa[IPaddrlen - 1] = 0x80;
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ohash = oldiphash(sa, sp, da, dp);
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if (ohash > Nipht)
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fprint(2, "oldiphash returns bad value: 0x%ulx, should be < 0x%ulx\n",
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ohash, Nipht);
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nhash = iphash(sa, sp, da, dp);
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if (nhash > Nipht)
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fprint(2, "iphash returns bad value: 0x%ulx, should be < 0x%ulx\n",
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ohash, Nipht);
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fprint(2, "ohash is 0x%ulx, nhash is 0x%ulx\n", ohash, nhash);
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if (ohash == nhash) {
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/* ohash and nhash should differs on gcc due to type promotion rules */
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fprint(2, "FAIL: iphash equals\n");
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exits("FAIL");
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}
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/* Always print PASS at the end. */
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print("PASS\n");
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exits("PASS");
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}
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