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// $Id: audit.c 207 2009-12-22 00:33:33Z jessekornblum $
#include "main.h"
void setup_audit(state *s)
{
s->match_exact = 0;
s->match_partial = 0;
s->match_moved = 0;
s->match_unknown = 0;
s->match_total = 0;
s->match_expect = 0;
}
int audit_status(state *s)
{
file_data_t * tmp = s->known;
s->match_unused = 0;
while (tmp != NULL)
{
if (0 == tmp->used)
{
s->match_unused++;
if (s->mode & mode_more_verbose)
{
display_filename(stdout,tmp->file_name);
print_status(": Known file not used");
}
}
tmp = tmp->next;
}
return (0 == s->match_unused &&
0 == s->match_unknown &&
0 == s->match_moved);
}
int display_audit_results(state *s)
{
int status = EXIT_SUCCESS;
if (NULL == s)
return EXIT_FAILURE;
if (!audit_status(s))
{
print_status("%s: Audit failed", __progname);
status = EXIT_FAILURE;
}
else
print_status("%s: Audit passed", __progname);
if (s->mode & mode_verbose)
{
/*
print_status(" Input files examined: %"PRIu64, s->match_total);
print_status(" Known files expecting: %"PRIu64, s->match_expect);
print_status(" ");
*/
print_status(" Files matched: %"PRIu64, s->match_exact);
print_status("Files paritally matched: %"PRIu64, s->match_partial);
print_status(" Files moved: %"PRIu64, s->match_moved);
print_status(" New files found: %"PRIu64, s->match_unknown);
print_status(" Known files not found: %"PRIu64, s->match_unused);
}
return status;
}
int audit_update(state *s)
{
int no_match = FALSE, exact_match = FALSE, moved = FALSE, partial = FALSE;
file_data_t * moved_file = NULL, * partial_file = NULL;
hashtable_entry_t * matches, * tmp;
uint64_t my_round;
hashname_t i;
if (NULL == s)
return TRUE;
my_round = s->hash_round;
s->hash_round++;
if (my_round > s->hash_round)
fatal_error(s,"%s: Too many input files", __progname);
// Although nobody uses match_total right now, we may in the future
// s->match_total++;
for (i = 0 ; i < NUM_ALGORITHMS; ++i)
{
if (s->hashes[i]->inuse)
{
matches = hashtable_contains(s,i);
tmp = matches;
if (NULL == tmp)
{
no_match = TRUE;
}
else while (tmp != NULL)
{
// print_status("Got status %d for %s", tmp->status, tmp->data->file_name);
if (tmp->data->used != s->hash_round)
{
switch (tmp->status) {
case status_match:
tmp->data->used = s->hash_round;
exact_match = TRUE;
break;
// This shouldn't happen
case status_no_match:
no_match = TRUE;
print_error_unicode(s,s->current_file->file_name,
"Internal error: Got match for \"no match\"");
break;
case status_file_name_mismatch:
moved = TRUE;
moved_file = tmp->data;
break;
// Hash collision
case status_partial_match:
case status_file_size_mismatch:
partial = TRUE;
partial_file = tmp->data;
break;
case status_unknown_error:
return status_unknown_error;
default:
break;
}
}
tmp = tmp->next;
}
hashtable_destroy(matches);
}
}
// If there was an exact match, that overrides any other matching
// 'moved' file. Usually this happens when the same file exists
// in two places. In this case we find an exact match and a case
// where the filenames don't match.
if (exact_match)
{
s->match_exact++;
if (s->mode & mode_insanely_verbose)
{
display_filename(stdout,s->current_file->file_name);
print_status(": Ok");
}
}
else if (no_match)
{
s->match_unknown++;
if (s->mode & mode_more_verbose)
{
display_filename(stdout,s->current_file->file_name);
print_status(": No match");
}
}
else if (moved)
{
s->match_moved++;
if (s->mode & mode_more_verbose)
{
display_filename(stdout,s->current_file->file_name);
fprintf(stdout,": Moved from ");
display_filename(stdout,moved_file->file_name);
print_status("");
}
}
// A file can have a hash collision even if it matches an otherwise
// known good. For example, an evil version of ntoskrnl.exe should
// have an exact match to EVILEVIL.EXE but still have a collision
// with the real ntoskrnl.exe. When this happens we should report
// both results.
if (partial)
{
// We only record the hash collision if it wasn't anything else.
// At the same time, however, a collision is such a significant
// event that we print it no matter what.
if (!exact_match && !moved && !no_match)
s->match_partial++;
display_filename(stdout,s->current_file->file_name);
fprintf(stdout,": Hash collision with ");
display_filename(stdout,partial_file->file_name);
print_status("");
}
return FALSE;
}
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