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/*-------------------------------------------------------------------------
*
* check_oids.c
*
* Many PostgreSQL system catalogs have OID, OID array, or OID vector
* columns where each OID identifies a row in some other catalog table.
* Although not marked as such, these are essentially foreign key
* relationships. The code in this file aims to validate that every
* object referenced in such a column actually exists.
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include "pg_catcheck.h"
static void do_oid_check(pg_catalog_table *tab, pg_catalog_column *tabcol,
int rownum, pg_catalog_check_oid * check_oid,
pg_catalog_table *reftab, char *value);
/*
* Set up for an OID referential integrity check.
*
* We simply need to make sure that the referenced table will be available.
*/
void
prepare_to_check_oid_reference(pg_catalog_table *tab,
pg_catalog_column *tabcol)
{
pg_catalog_check_oid *check_oid = tabcol->check;
pg_catalog_table *reftab;
reftab = find_table_by_name(check_oid->oid_references_table);
add_table_dependency(tab, reftab);
}
/*
* Perform an OID referential integrity check.
*/
void
check_oid_reference(pg_catalog_table *tab, pg_catalog_column *tabcol,
int rownum)
{
pg_catalog_check_oid *check_oid = tabcol->check;
char *val = PQgetvalue(tab->data, rownum, tabcol->result_column);
pg_catalog_table *reftab;
/*
* Find the hash table we need in order to perform the check.
*
* Since find_table_by_name is O(n) in the number of catalog tables being
* checked, we cache the result, so that we only need to do that work
* once.
*/
if (tabcol->check_private == NULL)
{
reftab = find_table_by_name(check_oid->oid_references_table);
tabcol->check_private = reftab;
}
else
reftab = tabcol->check_private;
/*
* The table might not be available in this server version, or we might
* have failed to read it. There's actually one real case where the
* referenced table was adding later than referring table: pg_largeobject
* has existed for a long time, but pg_largeobject_metadata is newer.
*/
if (!reftab->ht)
return;
switch (check_oid->type)
{
case CHECK_OID_REFERENCE:
/*
* Simple OID reference. Easy!
*
* We don't use do do_oid_check() here because the error message
* is a little different in this case.
*/
{
if (check_oid->zero_oid_ok && strcmp(val, "0") == 0)
return;
if (pgrhash_get(reftab->ht, &val) == -1)
pgcc_report(tab, tabcol, rownum,
"no matching entry in %s\n", reftab->table_name);
}
break;
case CHECK_OID_VECTOR_REFERENCE:
/* Space-separated list of values. */
{
char *s = val;
char buf[32];
for (;;)
{
/* Find next word boundary. */
while (*s != '\0' && *s != ' ')
++s;
/* If it's the last word, we're done here! */
if (*s == '\0')
{
if (s > val)
{
/* If last entry is non-empty, check it. */
do_oid_check(tab, tabcol, rownum, check_oid,
reftab, val);
}
break;
}
/* Make a copy of the data we need to check. */
if (s - val >= sizeof buf)
{
/* OIDs can't be this long. */
pgcc_report(tab, tabcol, rownum,
"contains a token of %ld characters\n", s - val);
return;
}
memcpy(buf, val, s - val);
buf[s - val] = '\0';
/* Check it and move ahead one character. */
do_oid_check(tab, tabcol, rownum, check_oid, reftab, buf);
val = ++s;
}
}
break;
case CHECK_OID_ARRAY_REFERENCE:
/* Opening curly brace, comma-separated values, closing brace. */
{
char *s = val;
char buf[32];
bool bad = false;
/* Allow a completely empty field. */
if (*s == '\0')
break;
/* Otherwise, expect the opening delimeter. */
if (*s == '{')
val = ++s;
else
bad = true;
while (!bad)
{
/* Find next delimeter. */
while (*s != '\0' && *s != ',' && *s != '}')
++s;
/*
* If we hit '\0' before '}', that's bad; and if we hit
* two consecutive delimeters, that's also bad.
*/
if (val == s || *s == '\0')
{
bad = true;
break;
}
/* Make a copy of the data we need to check. */
if (s - val >= sizeof buf)
{
/* OIDs can't be this long. */
pgcc_report(tab, tabcol, rownum,
"contains a token of %ld characters\n", s - val);
return;
}
memcpy(buf, val, s - val);
buf[s - val] = '\0';
/* Check it. */
if (!check_oid->zero_oid_ok || strcmp(buf, "0") != 0)
do_oid_check(tab, tabcol, rownum, check_oid, reftab,
buf);
/* Expect end of string if at '}'. */
if (*s == '}')
{
val = ++s;
if (*s != '\0')
bad = true;
break;
}
/* Skip comma and continue. */
val = ++s;
}
if (bad)
pgcc_report(tab, tabcol, rownum, "not a valid 1-D array");
}
break;
default:
Assert(false);
break;
}
}
/*
* Check one of possibly several OIDs found in a single column.
*/
static void
do_oid_check(pg_catalog_table *tab, pg_catalog_column *tabcol, int rownum,
pg_catalog_check_oid * check_oid,
pg_catalog_table *reftab, char *value)
{
if (check_oid->zero_oid_ok && strcmp(value, "0") == 0)
return;
if (pgrhash_get(reftab->ht, &value) == -1)
pgcc_report(tab, tabcol, rownum,
"\"%s\" not found in %s\n", value, reftab->table_name);
}
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