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Annotation of embedaddon/hping2/relid.c, revision 1.1.1.1

1.1       misho       1: /* 
                      2:  * $smu-mark$ 
                      3:  * $name: relid.c$ 
                      4:  * $author: Salvatore Sanfilippo <antirez@invece.org>$ 
                      5:  * $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$ 
                      6:  * $license: This software is under GPL version 2 of license$ 
                      7:  * $date: Fri Nov  5 11:55:49 MET 1999$ 
                      8:  * $rev: 3$ 
                      9:  */ 
                     10: 
                     11: /* FIXME: maybe it's better to avoid division per seq_diff and
                     12:    at least add an option to switch on/off this feature */
                     13: 
                     14: #include "hping2.h"
                     15: #include "globals.h"
                     16: 
                     17: int relativize_id(int seqnum, int *ip_id)
                     18: {
                     19:        int seq_diff, backup_id;
                     20:        static int last_seq = 0, last_id = -1;
                     21: 
                     22:        backup_id = *ip_id;
                     23: 
                     24:        if (last_id == -1) {
                     25:                last_id = *ip_id;
                     26:                last_seq = seqnum;
                     27:        }
                     28:        else
                     29:        {
                     30:                if ( (seq_diff=(seqnum-last_seq)) > 0)
                     31:                {
                     32:                        if (last_id > *ip_id) /* rew */
                     33:                                *ip_id = ((65535-last_id)
                     34:                                    + *ip_id)/seq_diff;
                     35:                                else
                     36:                                *ip_id = (*ip_id-last_id)
                     37:                                        /seq_diff;
                     38:                        last_id = backup_id;
                     39:                        last_seq = seqnum;
                     40:                        return TRUE;
                     41:                } else {
                     42:                        out_of_sequence_pkt++;
                     43:                }
                     44:        }
                     45:        return FALSE;
                     46: }