143 lines
2.3 KiB
C
143 lines
2.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include "system.h"
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#include "tracebuf.h"
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//! Help counter for the number of unknowns.
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int cUnk = 0;
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//! Help counter for the number of todos.
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int cTod = 0;
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//! Mark all events of the same run before the event as required.
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/**
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*@param sys The system.
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*@param tb The attack buffer.
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*@param ev The reference event index.
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*/
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void
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markback (const System sys, struct tracebuf *tb, int ev)
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{
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int run = tb->run[ev];
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while (ev >= 0)
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{
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if (tb->run[ev] == run)
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{
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switch (tb->event[ev]->type)
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{
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case READ:
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switch (tb->status[ev])
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{
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case S_UNK:
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cUnk--;
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case S_RED:
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tb->status[ev] = S_TOD;
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cTod++;
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break;
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case S_TOD:
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case S_OKE:
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break;
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}
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break;
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case SEND:
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case CLAIM:
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if (tb->status[ev] == S_UNK)
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{
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cUnk--;
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}
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tb->status[ev] = S_OKE;
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break;
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}
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}
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ev--;
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}
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}
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//! Minimize the attack.
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void
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attackMinimize (const System sys, struct tracebuf *tb)
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{
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int i;
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int j;
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cUnk = 0;
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cTod = 0;
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for (i = 0; i < tb->length; i++)
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{
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switch (tb->status[i])
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{
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case S_UNK:
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cUnk++;
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break;
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case S_TOD:
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cTod++;
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break;
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default:
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break;
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}
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}
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markback (sys, tb, tb->violatedclaim);
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while (cUnk + cTod > 0)
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{
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while (cTod > 0)
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{
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for (i = 0; i < tb->length; i++)
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// kies een i; laten we de eerste maar pakken
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{
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if (tb->status[i] == S_TOD)
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break;
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}
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if (i == tb->length)
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{
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printf ("Some step error.\n");
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exit (1);
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}
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j = i;
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while (j >= 0 && inKnowledge (tb->know[j], tb->event[i]->message))
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{
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// zoek waar m in de kennis komt
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j--;
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}
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tb->status[i] = S_OKE;
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cTod--;
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if (j >= 0)
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{
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markback (sys, tb, j);
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}
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}
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while (cTod == 0 && cUnk > 0)
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{
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for (i = tb->length - 1; i >= 0; i--)
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// pak laatste i
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{
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if (tb->status[i] == S_UNK)
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break;
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}
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if (i < 0)
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{
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printf ("Some i<0 error.\n");
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exit (1);
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}
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tb->status[i] = S_RED;
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cUnk--;
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tb->reallength--;
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j = tracebufRebuildKnow (tb);
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if (j > -1)
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{
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tb->reallength++;
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markback (sys, tb, i);
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if (j < tb->length)
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{
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tb->link[j] = (tb->link[j] > i ? tb->link[j] : i);
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}
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}
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}
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}
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}
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