47 lines
967 B
C
47 lines
967 B
C
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/*
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* $smu-mark$
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* $name: relid.c$
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* $author: Salvatore Sanfilippo <antirez@invece.org>$
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* $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$
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* $license: This software is under GPL version 2 of license$
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* $date: Fri Nov 5 11:55:49 MET 1999$
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* $rev: 3$
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*/
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/* FIXME: maybe it's better to avoid division per seq_diff and
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at least add an option to switch on/off this feature */
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#include "hping2.h"
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#include "globals.h"
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int relativize_id(int seqnum, int *ip_id)
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{
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int seq_diff, backup_id;
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static int last_seq = 0, last_id = -1;
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backup_id = *ip_id;
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if (last_id == -1) {
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last_id = *ip_id;
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last_seq = seqnum;
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}
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else
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{
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if ( (seq_diff=(seqnum-last_seq)) > 0)
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{
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if (last_id > *ip_id) /* rew */
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*ip_id = ((65535-last_id)
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+ *ip_id)/seq_diff;
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else
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*ip_id = (*ip_id-last_id)
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/seq_diff;
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last_id = backup_id;
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last_seq = seqnum;
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return TRUE;
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} else {
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out_of_sequence_pkt++;
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}
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}
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return FALSE;
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}
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