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Overview
| Comment: | Expand the /hash-collisions report to show hash prefix collisions on just check-ins in addition to overall hash collisions. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
60af05741590fa9829b321641f4620aa |
| User & Date: | drh 2015-05-14 18:25:42 |
Context
|
2015-05-14
| ||
| 18:31 | Fix the error output for command-line option errors on the "fossil http" command. check-in: 648dc3e7 user: drh tags: trunk | |
| 18:25 | Expand the /hash-collisions report to show hash prefix collisions on just check-ins in addition to overall hash collisions. check-in: 60af0574 user: drh tags: trunk | |
| 16:20 | Increase the version number to 1.33. Update the change log. check-in: af872ded user: drh tags: trunk | |
Changes
Changes to src/name.c.
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describe_artifacts_to_stdout("IN (SELECT rid FROM blob WHERE size<0)", 0);
}
/* Maximum number of collision examples to remember */
#define MAX_COLLIDE 25
/*
** WEBPAGE: hash-collisions
**
** Show the number of hash collisions for hash prefixes of various lengths.
*/
void hash_collisions_webpage(void){
int i, j, kk;
int nHash = 0;
Stmt q;
char zPrev[UUID_SIZE+1];
struct {
int cnt;
char *azHit[MAX_COLLIDE];
char z[UUID_SIZE+1];
} aCollide[UUID_SIZE+1];
login_check_credentials();
if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
memset(aCollide, 0, sizeof(aCollide));
memset(zPrev, 0, sizeof(zPrev));
db_prepare(&q,"SELECT uuid FROM blob ORDER BY 1");
while( db_step(&q)==SQLITE_ROW ){
const char *zUuid = db_column_text(&q,0);
int n = db_column_bytes(&q,0);
int i;
nHash++;
for(i=0; zPrev[i] && zPrev[i]==zUuid[i]; i++){}
if( i>0 && i<=UUID_SIZE ){
................................................................................
}
aCollide[i].cnt++;
if( aCollide[i].z[0]==0 ) memcpy(aCollide[i].z, zPrev, n+1);
}
memcpy(zPrev, zUuid, n+1);
}
db_finalize(&q);
style_header("SHA1 Prefix Collisions");
style_submenu_element("Activity Reports", 0, "reports");
style_submenu_element("Stats", 0, "stat");
@ <table border=1><thead>
@ <tr><th>Length<th>Instances<th>First Instance</tr>
@ </thead><tbody>
for(i=1; i<=UUID_SIZE; i++){
if( aCollide[i].cnt==0 ) continue;
@ <tr><td>%d(i)<td>%d(aCollide[i].cnt)<td>%h(aCollide[i].z)</tr>
}
................................................................................
}
for(j=0; j<aCollide[i].cnt && j<MAX_COLLIDE; j++){
char *zId = aCollide[i].azHit[j];
if( zId==0 ) continue;
@ %z(href("%R/whatis/%s",zId))%h(zId)</a>
}
}
style_footer();
}
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describe_artifacts_to_stdout("IN (SELECT rid FROM blob WHERE size<0)", 0);
}
/* Maximum number of collision examples to remember */
#define MAX_COLLIDE 25
/*
** Generate a report on the number of collisions in SHA1 hashes
** generated by the SQL given in the argument.
*/
static void collision_report(const char *zSql){
int i, j, kk;
int nHash = 0;
Stmt q;
char zPrev[UUID_SIZE+1];
struct {
int cnt;
char *azHit[MAX_COLLIDE];
char z[UUID_SIZE+1];
} aCollide[UUID_SIZE+1];
memset(aCollide, 0, sizeof(aCollide));
memset(zPrev, 0, sizeof(zPrev));
db_prepare(&q,"%s",zSql/*safe-for-%s*/);
while( db_step(&q)==SQLITE_ROW ){
const char *zUuid = db_column_text(&q,0);
int n = db_column_bytes(&q,0);
int i;
nHash++;
for(i=0; zPrev[i] && zPrev[i]==zUuid[i]; i++){}
if( i>0 && i<=UUID_SIZE ){
................................................................................
}
aCollide[i].cnt++;
if( aCollide[i].z[0]==0 ) memcpy(aCollide[i].z, zPrev, n+1);
}
memcpy(zPrev, zUuid, n+1);
}
db_finalize(&q);
@ <table border=1><thead>
@ <tr><th>Length<th>Instances<th>First Instance</tr>
@ </thead><tbody>
for(i=1; i<=UUID_SIZE; i++){
if( aCollide[i].cnt==0 ) continue;
@ <tr><td>%d(i)<td>%d(aCollide[i].cnt)<td>%h(aCollide[i].z)</tr>
}
................................................................................
}
for(j=0; j<aCollide[i].cnt && j<MAX_COLLIDE; j++){
char *zId = aCollide[i].azHit[j];
if( zId==0 ) continue;
@ %z(href("%R/whatis/%s",zId))%h(zId)</a>
}
}
for(i=4; i<ArraySize(aCollide); i++){
for(j=0; j<aCollide[i].cnt && j<MAX_COLLIDE; j++){
fossil_free(aCollide[i].azHit[j]);
}
}
}
/*
** WEBPAGE: hash-collisions
**
** Show the number of hash collisions for hash prefixes of various lengths.
*/
void hash_collisions_webpage(void){
Stmt q;
login_check_credentials();
if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
style_header("SHA1 Prefix Collisions");
style_submenu_element("Activity Reports", 0, "reports");
style_submenu_element("Stats", 0, "stat");
@ <h1>Hash Prefix Collisions on Check-ins</h1>
collision_report("SELECT (SELECT uuid FROM blob WHERE rid=objid)"
" FROM event WHERE event.type='ci'"
" ORDER BY 1");
@ <h1>Hash Prefix Collisions on All Artifacts</h1>
collision_report("SELECT uuid FROM blob ORDER BY 1");
style_footer();
}
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