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Consolidate and improve checking of key-column-attnum arguments for
dblink_build_sql_insert() and related functions. In particular, be sure to reject references to dropped and out-of-range column numbers. The numbers are still interpreted as physical column numbers, though, for backward compatibility. This patch replaces Joe's patch of 2010-02-03, which handled only some aspects of the problem.
This commit is contained in:
Tom Lane
parent
540113dc96
commit
48a7245391
@ -8,7 +8,7 @@
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* Darko Prenosil <Darko.Prenosil@finteh.hr>
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* Shridhar Daithankar <shridhar_daithankar@persistent.co.in>
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*
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* $PostgreSQL: pgsql/contrib/dblink/dblink.c,v 1.95 2010/06/14 20:49:33 tgl Exp $
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* $PostgreSQL: pgsql/contrib/dblink/dblink.c,v 1.96 2010/06/15 16:22:19 tgl Exp $
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* Copyright (c) 2001-2010, PostgreSQL Global Development Group
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* ALL RIGHTS RESERVED;
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*
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@ -88,13 +88,13 @@ static void createNewConnection(const char *name, remoteConn *rconn);
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static void deleteConnection(const char *name);
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static char **get_pkey_attnames(Relation rel, int16 *numatts);
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static char **get_text_array_contents(ArrayType *array, int *numitems);
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static char *get_sql_insert(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals);
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static char *get_sql_delete(Relation rel, int2vector *pkattnums, int16 pknumatts, char **tgt_pkattvals);
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static char *get_sql_update(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals);
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static char *get_sql_insert(Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals, char **tgt_pkattvals);
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static char *get_sql_delete(Relation rel, int *pkattnums, int pknumatts, char **tgt_pkattvals);
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static char *get_sql_update(Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals, char **tgt_pkattvals);
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static char *quote_literal_cstr(char *rawstr);
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static char *quote_ident_cstr(char *rawstr);
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static int16 get_attnum_pk_pos(int2vector *pkattnums, int16 pknumatts, int16 key);
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static HeapTuple get_tuple_of_interest(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals);
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static int get_attnum_pk_pos(int *pkattnums, int pknumatts, int key);
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static HeapTuple get_tuple_of_interest(Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals);
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static Relation get_rel_from_relname(text *relname_text, LOCKMODE lockmode, AclMode aclmode);
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static char *generate_relation_name(Relation rel);
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static void dblink_connstr_check(const char *connstr);
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@ -102,7 +102,9 @@ static void dblink_security_check(PGconn *conn, remoteConn *rconn);
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static void dblink_res_error(const char *conname, PGresult *res, const char *dblink_context_msg, bool fail);
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static char *get_connect_string(const char *servername);
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static char *escape_param_str(const char *from);
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static int get_nondropped_natts(Relation rel);
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static void validate_pkattnums(Relation rel,
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int2vector *pkattnums_arg, int32 pknumatts_arg,
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int **pkattnums, int *pknumatts);
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/* Global */
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static remoteConn *pconn = NULL;
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@ -1239,18 +1241,18 @@ Datum
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dblink_build_sql_insert(PG_FUNCTION_ARGS)
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{
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text *relname_text = PG_GETARG_TEXT_P(0);
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int2vector *pkattnums = (int2vector *) PG_GETARG_POINTER(1);
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int32 pknumatts_tmp = PG_GETARG_INT32(2);
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int2vector *pkattnums_arg = (int2vector *) PG_GETARG_POINTER(1);
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int32 pknumatts_arg = PG_GETARG_INT32(2);
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ArrayType *src_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
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ArrayType *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(4);
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Relation rel;
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int16 pknumatts = 0;
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int *pkattnums;
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int pknumatts;
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char **src_pkattvals;
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char **tgt_pkattvals;
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int src_nitems;
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int tgt_nitems;
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char *sql;
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int nondropped_natts;
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/*
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* Open target relation.
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@ -1258,29 +1260,10 @@ dblink_build_sql_insert(PG_FUNCTION_ARGS)
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rel = get_rel_from_relname(relname_text, AccessShareLock, ACL_SELECT);
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/*
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* There should be at least one key attribute
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* Process pkattnums argument.
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*/
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if (pknumatts_tmp <= 0)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("number of key attributes must be > 0")));
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if (pknumatts_tmp <= SHRT_MAX)
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pknumatts = pknumatts_tmp;
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else
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("input for number of primary key " \
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"attributes too large")));
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/*
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* ensure we don't ask for more pk attributes than we have non-dropped
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* columns
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*/
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nondropped_natts = get_nondropped_natts(rel);
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if (pknumatts > nondropped_natts)
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ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("number of primary key fields exceeds number of specified relation attributes")));
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validate_pkattnums(rel, pkattnums_arg, pknumatts_arg,
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&pkattnums, &pknumatts);
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/*
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* Source array is made up of key values that will be used to locate the
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@ -1349,12 +1332,12 @@ Datum
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dblink_build_sql_delete(PG_FUNCTION_ARGS)
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{
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text *relname_text = PG_GETARG_TEXT_P(0);
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int2vector *pkattnums = (int2vector *) PG_GETARG_POINTER(1);
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int32 pknumatts_tmp = PG_GETARG_INT32(2);
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int2vector *pkattnums_arg = (int2vector *) PG_GETARG_POINTER(1);
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int32 pknumatts_arg = PG_GETARG_INT32(2);
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ArrayType *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
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int nondropped_natts;
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Relation rel;
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int16 pknumatts = 0;
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int *pkattnums;
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int pknumatts;
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char **tgt_pkattvals;
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int tgt_nitems;
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char *sql;
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@ -1365,29 +1348,10 @@ dblink_build_sql_delete(PG_FUNCTION_ARGS)
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rel = get_rel_from_relname(relname_text, AccessShareLock, ACL_SELECT);
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/*
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* There should be at least one key attribute
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* Process pkattnums argument.
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*/
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if (pknumatts_tmp <= 0)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("number of key attributes must be > 0")));
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if (pknumatts_tmp <= SHRT_MAX)
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pknumatts = pknumatts_tmp;
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else
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("input for number of primary key " \
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"attributes too large")));
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/*
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* ensure we don't ask for more pk attributes than we have non-dropped
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* columns
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*/
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nondropped_natts = get_nondropped_natts(rel);
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if (pknumatts > nondropped_natts)
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ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("number of primary key fields exceeds number of specified relation attributes")));
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validate_pkattnums(rel, pkattnums_arg, pknumatts_arg,
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&pkattnums, &pknumatts);
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/*
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* Target array is made up of key values that will be used to build the
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@ -1445,13 +1409,13 @@ Datum
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dblink_build_sql_update(PG_FUNCTION_ARGS)
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{
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text *relname_text = PG_GETARG_TEXT_P(0);
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int2vector *pkattnums = (int2vector *) PG_GETARG_POINTER(1);
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int32 pknumatts_tmp = PG_GETARG_INT32(2);
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int2vector *pkattnums_arg = (int2vector *) PG_GETARG_POINTER(1);
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int32 pknumatts_arg = PG_GETARG_INT32(2);
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ArrayType *src_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
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ArrayType *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(4);
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int nondropped_natts;
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Relation rel;
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int16 pknumatts = 0;
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int *pkattnums;
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int pknumatts;
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char **src_pkattvals;
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char **tgt_pkattvals;
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int src_nitems;
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@ -1464,29 +1428,10 @@ dblink_build_sql_update(PG_FUNCTION_ARGS)
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rel = get_rel_from_relname(relname_text, AccessShareLock, ACL_SELECT);
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/*
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* There should be one source array key values for each key attnum
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* Process pkattnums argument.
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*/
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if (pknumatts_tmp <= 0)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("number of key attributes must be > 0")));
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if (pknumatts_tmp <= SHRT_MAX)
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pknumatts = pknumatts_tmp;
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else
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("input for number of primary key " \
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"attributes too large")));
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/*
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* ensure we don't ask for more pk attributes than we have non-dropped
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* columns
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*/
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nondropped_natts = get_nondropped_natts(rel);
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if (pknumatts > nondropped_natts)
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ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("number of primary key fields exceeds number of specified relation attributes")));
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validate_pkattnums(rel, pkattnums_arg, pknumatts_arg,
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&pkattnums, &pknumatts);
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/*
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* Source array is made up of key values that will be used to locate the
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@ -1751,7 +1696,7 @@ get_text_array_contents(ArrayType *array, int *numitems)
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}
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static char *
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get_sql_insert(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals)
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get_sql_insert(Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals, char **tgt_pkattvals)
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{
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char *relname;
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HeapTuple tuple;
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@ -1759,7 +1704,7 @@ get_sql_insert(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_
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int natts;
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StringInfoData buf;
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char *val;
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int16 key;
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int key;
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int i;
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bool needComma;
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@ -1808,7 +1753,7 @@ get_sql_insert(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_
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appendStringInfo(&buf, ",");
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if (tgt_pkattvals != NULL)
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key = get_attnum_pk_pos(pkattnums, pknumatts, i + 1);
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key = get_attnum_pk_pos(pkattnums, pknumatts, i);
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else
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key = -1;
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@ -1832,11 +1777,10 @@ get_sql_insert(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_
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}
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static char *
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get_sql_delete(Relation rel, int2vector *pkattnums, int16 pknumatts, char **tgt_pkattvals)
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get_sql_delete(Relation rel, int *pkattnums, int pknumatts, char **tgt_pkattvals)
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{
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char *relname;
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TupleDesc tupdesc;
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int natts;
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StringInfoData buf;
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int i;
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@ -1846,18 +1790,17 @@ get_sql_delete(Relation rel, int2vector *pkattnums, int16 pknumatts, char **tgt_
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relname = generate_relation_name(rel);
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tupdesc = rel->rd_att;
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natts = tupdesc->natts;
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appendStringInfo(&buf, "DELETE FROM %s WHERE ", relname);
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for (i = 0; i < pknumatts; i++)
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{
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int16 pkattnum = pkattnums->values[i];
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int pkattnum = pkattnums[i];
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if (i > 0)
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appendStringInfo(&buf, " AND ");
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appendStringInfoString(&buf,
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quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum - 1]->attname)));
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quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum]->attname)));
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if (tgt_pkattvals == NULL)
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/* internal error */
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@ -1874,7 +1817,7 @@ get_sql_delete(Relation rel, int2vector *pkattnums, int16 pknumatts, char **tgt_
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}
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static char *
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get_sql_update(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals)
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get_sql_update(Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals, char **tgt_pkattvals)
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{
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char *relname;
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HeapTuple tuple;
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@ -1882,7 +1825,7 @@ get_sql_update(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_
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int natts;
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StringInfoData buf;
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char *val;
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int16 key;
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int key;
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int i;
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bool needComma;
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@ -1915,7 +1858,7 @@ get_sql_update(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_
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quote_ident_cstr(NameStr(tupdesc->attrs[i]->attname)));
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if (tgt_pkattvals != NULL)
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key = get_attnum_pk_pos(pkattnums, pknumatts, i + 1);
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key = get_attnum_pk_pos(pkattnums, pknumatts, i);
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else
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key = -1;
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@ -1938,18 +1881,18 @@ get_sql_update(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_
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for (i = 0; i < pknumatts; i++)
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{
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int16 pkattnum = pkattnums->values[i];
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int pkattnum = pkattnums[i];
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if (i > 0)
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appendStringInfo(&buf, " AND ");
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appendStringInfo(&buf, "%s",
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quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum - 1]->attname)));
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quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum]->attname)));
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if (tgt_pkattvals != NULL)
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val = tgt_pkattvals[i] ? pstrdup(tgt_pkattvals[i]) : NULL;
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else
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val = SPI_getvalue(tuple, tupdesc, pkattnum);
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val = SPI_getvalue(tuple, tupdesc, pkattnum + 1);
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if (val != NULL)
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{
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@ -2001,8 +1944,8 @@ quote_ident_cstr(char *rawstr)
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return result;
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}
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static int16
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get_attnum_pk_pos(int2vector *pkattnums, int16 pknumatts, int16 key)
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static int
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get_attnum_pk_pos(int *pkattnums, int pknumatts, int key)
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{
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int i;
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@ -2010,14 +1953,14 @@ get_attnum_pk_pos(int2vector *pkattnums, int16 pknumatts, int16 key)
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* Not likely a long list anyway, so just scan for the value
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*/
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for (i = 0; i < pknumatts; i++)
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if (key == pkattnums->values[i])
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if (key == pkattnums[i])
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return i;
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return -1;
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}
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static HeapTuple
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get_tuple_of_interest(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals)
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get_tuple_of_interest(Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals)
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{
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char *relname;
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TupleDesc tupdesc;
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@ -2048,13 +1991,13 @@ get_tuple_of_interest(Relation rel, int2vector *pkattnums, int16 pknumatts, char
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for (i = 0; i < pknumatts; i++)
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{
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int16 pkattnum = pkattnums->values[i];
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int pkattnum = pkattnums[i];
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if (i > 0)
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appendStringInfo(&buf, " AND ");
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appendStringInfoString(&buf,
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quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum - 1]->attname)));
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quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum]->attname)));
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if (src_pkattvals[i] != NULL)
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appendStringInfo(&buf, " = %s",
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@ -2428,23 +2371,51 @@ escape_param_str(const char *str)
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return buf->data;
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}
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static int
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get_nondropped_natts(Relation rel)
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/*
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* Validate the PK-attnums argument for dblink_build_sql_insert() and related
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* functions, and translate to the internal representation.
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*
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* The user supplies an int2vector of 1-based physical attnums, plus a count
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* argument (the need for the separate count argument is historical, but we
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* still check it). We check that each attnum corresponds to a valid,
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* non-dropped attribute of the rel. We do *not* prevent attnums from being
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* listed twice, though the actual use-case for such things is dubious.
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*
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* The internal representation is a palloc'd int array of 0-based physical
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* attnums.
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*/
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static void
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validate_pkattnums(Relation rel,
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int2vector *pkattnums_arg, int32 pknumatts_arg,
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int **pkattnums, int *pknumatts)
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{
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int nondropped_natts = 0;
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TupleDesc tupdesc;
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int natts;
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TupleDesc tupdesc = rel->rd_att;
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int natts = tupdesc->natts;
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int i;
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tupdesc = rel->rd_att;
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natts = tupdesc->natts;
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/* Don't take more array elements than there are */
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pknumatts_arg = Min(pknumatts_arg, pkattnums_arg->dim1);
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|
||||
for (i = 0; i < natts; i++)
|
||||
/* Must have at least one pk attnum selected */
|
||||
if (pknumatts_arg <= 0)
|
||||
ereport(ERROR,
|
||||
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
||||
errmsg("number of key attributes must be > 0")));
|
||||
|
||||
/* Allocate output array */
|
||||
*pkattnums = (int *) palloc(pknumatts_arg * sizeof(int));
|
||||
*pknumatts = pknumatts_arg;
|
||||
|
||||
/* Validate attnums and convert to internal form */
|
||||
for (i = 0; i < pknumatts_arg; i++)
|
||||
{
|
||||
if (tupdesc->attrs[i]->attisdropped)
|
||||
continue;
|
||||
nondropped_natts++;
|
||||
}
|
||||
int pkattnum = pkattnums_arg->values[i];
|
||||
|
||||
return nondropped_natts;
|
||||
if (pkattnum <= 0 || pkattnum > natts ||
|
||||
tupdesc->attrs[pkattnum - 1]->attisdropped)
|
||||
ereport(ERROR,
|
||||
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
||||
errmsg("invalid attribute number %d", pkattnum)));
|
||||
(*pkattnums)[i] = pkattnum - 1;
|
||||
}
|
||||
}
|
||||
|
||||
@ -41,7 +41,7 @@ SELECT dblink_build_sql_insert('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
|
||||
|
||||
-- too many pk fields, should fail
|
||||
SELECT dblink_build_sql_insert('foo','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}','{"99", "xyz", "{za0,zb0,zc0}"}');
|
||||
ERROR: number of primary key fields exceeds number of specified relation attributes
|
||||
ERROR: invalid attribute number 4
|
||||
-- build an update statement based on a local tuple,
|
||||
-- replacing the primary key values with new ones
|
||||
SELECT dblink_build_sql_update('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
|
||||
@ -52,7 +52,7 @@ SELECT dblink_build_sql_update('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
|
||||
|
||||
-- too many pk fields, should fail
|
||||
SELECT dblink_build_sql_update('foo','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}','{"99", "xyz", "{za0,zb0,zc0}"}');
|
||||
ERROR: number of primary key fields exceeds number of specified relation attributes
|
||||
ERROR: invalid attribute number 4
|
||||
-- build a delete statement based on a local tuple,
|
||||
SELECT dblink_build_sql_delete('foo','1 2',2,'{"0", "a"}');
|
||||
dblink_build_sql_delete
|
||||
@ -62,7 +62,7 @@ SELECT dblink_build_sql_delete('foo','1 2',2,'{"0", "a"}');
|
||||
|
||||
-- too many pk fields, should fail
|
||||
SELECT dblink_build_sql_delete('foo','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}');
|
||||
ERROR: number of primary key fields exceeds number of specified relation attributes
|
||||
ERROR: invalid attribute number 4
|
||||
-- retest using a quoted and schema qualified table
|
||||
CREATE SCHEMA "MySchema";
|
||||
CREATE TABLE "MySchema"."Foo"(f1 int, f2 text, f3 text[], primary key (f1,f2));
|
||||
|
||||
Loading…
Reference in New Issue
Block a user