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dblink.c
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1/*
2 * dblink.c
3 *
4 * Functions returning results from a remote database
5 *
6 * Joe Conway <mail@joeconway.com>
7 * And contributors:
8 * Darko Prenosil <Darko.Prenosil@finteh.hr>
9 * Shridhar Daithankar <shridhar_daithankar@persistent.co.in>
10 *
11 * contrib/dblink/dblink.c
12 * Copyright (c) 2001-2024, PostgreSQL Global Development Group
13 * ALL RIGHTS RESERVED;
14 *
15 * Permission to use, copy, modify, and distribute this software and its
16 * documentation for any purpose, without fee, and without a written agreement
17 * is hereby granted, provided that the above copyright notice and this
18 * paragraph and the following two paragraphs appear in all copies.
19 *
20 * IN NO EVENT SHALL THE AUTHOR OR DISTRIBUTORS BE LIABLE TO ANY PARTY FOR
21 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
22 * LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
23 * DOCUMENTATION, EVEN IF THE AUTHOR OR DISTRIBUTORS HAVE BEEN ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 *
26 * THE AUTHOR AND DISTRIBUTORS SPECIFICALLY DISCLAIMS ANY WARRANTIES,
27 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
28 * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
29 * ON AN "AS IS" BASIS, AND THE AUTHOR AND DISTRIBUTORS HAS NO OBLIGATIONS TO
30 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
31 *
32 */
33#include "postgres.h"
34
35#include <limits.h>
36
37#include "access/htup_details.h"
38#include "access/relation.h"
39#include "access/reloptions.h"
40#include "access/table.h"
41#include "catalog/namespace.h"
44#include "catalog/pg_type.h"
46#include "executor/spi.h"
47#include "foreign/foreign.h"
48#include "funcapi.h"
49#include "lib/stringinfo.h"
50#include "libpq-fe.h"
51#include "libpq/libpq-be.h"
53#include "mb/pg_wchar.h"
54#include "miscadmin.h"
55#include "parser/scansup.h"
56#include "utils/acl.h"
57#include "utils/builtins.h"
58#include "utils/fmgroids.h"
59#include "utils/guc.h"
60#include "utils/lsyscache.h"
61#include "utils/memutils.h"
62#include "utils/rel.h"
63#include "utils/varlena.h"
64#include "utils/wait_event.h"
65
67
68typedef struct remoteConn
69{
70 PGconn *conn; /* Hold the remote connection */
71 int openCursorCount; /* The number of open cursors */
72 bool newXactForCursor; /* Opened a transaction for a cursor */
74
75typedef struct storeInfo
76{
81 char **cstrs;
82 /* temp storage for results to avoid leaks on exception */
86
87/*
88 * Internal declarations
89 */
90static Datum dblink_record_internal(FunctionCallInfo fcinfo, bool is_async);
91static void prepTuplestoreResult(FunctionCallInfo fcinfo);
93 PGresult *res);
95 PGconn *conn,
96 const char *conname,
97 const char *sql,
98 bool fail);
99static PGresult *storeQueryResult(volatile storeInfo *sinfo, PGconn *conn, const char *sql);
100static void storeRow(volatile storeInfo *sinfo, PGresult *res, bool first);
101static remoteConn *getConnectionByName(const char *name);
102static HTAB *createConnHash(void);
103static void createNewConnection(const char *name, remoteConn *rconn);
104static void deleteConnection(const char *name);
105static char **get_pkey_attnames(Relation rel, int16 *indnkeyatts);
106static char **get_text_array_contents(ArrayType *array, int *numitems);
107static char *get_sql_insert(Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals, char **tgt_pkattvals);
108static char *get_sql_delete(Relation rel, int *pkattnums, int pknumatts, char **tgt_pkattvals);
109static char *get_sql_update(Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals, char **tgt_pkattvals);
110static char *quote_ident_cstr(char *rawstr);
111static int get_attnum_pk_pos(int *pkattnums, int pknumatts, int key);
112static HeapTuple get_tuple_of_interest(Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals);
113static Relation get_rel_from_relname(text *relname_text, LOCKMODE lockmode, AclMode aclmode);
114static char *generate_relation_name(Relation rel);
115static void dblink_connstr_check(const char *connstr);
116static bool dblink_connstr_has_pw(const char *connstr);
117static void dblink_security_check(PGconn *conn, remoteConn *rconn, const char *connstr);
118static void dblink_res_error(PGconn *conn, const char *conname, PGresult *res,
119 bool fail, const char *fmt,...) pg_attribute_printf(5, 6);
120static char *get_connect_string(const char *servername);
121static char *escape_param_str(const char *str);
122static void validate_pkattnums(Relation rel,
123 int2vector *pkattnums_arg, int32 pknumatts_arg,
124 int **pkattnums, int *pknumatts);
126 const char *option, Oid context);
127static int applyRemoteGucs(PGconn *conn);
128static void restoreLocalGucs(int nestlevel);
129
130/* Global */
131static remoteConn *pconn = NULL;
132static HTAB *remoteConnHash = NULL;
133
134/* custom wait event values, retrieved from shared memory */
138
139/*
140 * Following is list that holds multiple remote connections.
141 * Calling convention of each dblink function changes to accept
142 * connection name as the first parameter. The connection list is
143 * much like ecpg e.g. a mapping between a name and a PGconn object.
144 */
145
146typedef struct remoteConnHashEnt
147{
151
152/* initial number of connection hashes */
153#define NUMCONN 16
154
155static char *
156xpstrdup(const char *in)
157{
158 if (in == NULL)
159 return NULL;
160 return pstrdup(in);
161}
162
163static void
165dblink_res_internalerror(PGconn *conn, PGresult *res, const char *p2)
166{
167 char *msg = pchomp(PQerrorMessage(conn));
168
170 elog(ERROR, "%s: %s", p2, msg);
171}
172
173static void
175dblink_conn_not_avail(const char *conname)
176{
177 if (conname)
179 (errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST),
180 errmsg("connection \"%s\" not available", conname)));
181 else
183 (errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST),
184 errmsg("connection not available")));
185}
186
187static void
188dblink_get_conn(char *conname_or_str,
189 PGconn *volatile *conn_p, char **conname_p, volatile bool *freeconn_p)
190{
191 remoteConn *rconn = getConnectionByName(conname_or_str);
192 PGconn *conn;
193 char *conname;
194 bool freeconn;
195
196 if (rconn)
197 {
198 conn = rconn->conn;
199 conname = conname_or_str;
200 freeconn = false;
201 }
202 else
203 {
204 const char *connstr;
205
206 connstr = get_connect_string(conname_or_str);
207 if (connstr == NULL)
208 connstr = conname_or_str;
210
211 /* first time, allocate or get the custom wait event */
212 if (dblink_we_get_conn == 0)
213 dblink_we_get_conn = WaitEventExtensionNew("DblinkGetConnect");
214
215 /* OK to make connection */
217
219 {
220 char *msg = pchomp(PQerrorMessage(conn));
221
224 (errcode(ERRCODE_SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION),
225 errmsg("could not establish connection"),
226 errdetail_internal("%s", msg)));
227 }
231 freeconn = true;
232 conname = NULL;
233 }
234
235 *conn_p = conn;
236 *conname_p = conname;
237 *freeconn_p = freeconn;
238}
239
240static PGconn *
241dblink_get_named_conn(const char *conname)
242{
243 remoteConn *rconn = getConnectionByName(conname);
244
245 if (rconn)
246 return rconn->conn;
247
248 dblink_conn_not_avail(conname);
249 return NULL; /* keep compiler quiet */
250}
251
252static void
254{
255 if (!pconn)
256 {
257 if (dblink_we_get_result == 0)
258 dblink_we_get_result = WaitEventExtensionNew("DblinkGetResult");
259
261 pconn->conn = NULL;
263 pconn->newXactForCursor = false;
264 }
265}
266
267/*
268 * Create a persistent connection to another database
269 */
271Datum
273{
274 char *conname_or_str = NULL;
275 char *connstr = NULL;
276 char *connname = NULL;
277 char *msg;
278 PGconn *conn = NULL;
279 remoteConn *rconn = NULL;
280
281 dblink_init();
282
283 if (PG_NARGS() == 2)
284 {
285 conname_or_str = text_to_cstring(PG_GETARG_TEXT_PP(1));
286 connname = text_to_cstring(PG_GETARG_TEXT_PP(0));
287 }
288 else if (PG_NARGS() == 1)
289 conname_or_str = text_to_cstring(PG_GETARG_TEXT_PP(0));
290
291 if (connname)
292 {
294 sizeof(remoteConn));
295 rconn->conn = NULL;
296 rconn->openCursorCount = 0;
297 rconn->newXactForCursor = false;
298 }
299
300 /* first check for valid foreign data server */
301 connstr = get_connect_string(conname_or_str);
302 if (connstr == NULL)
303 connstr = conname_or_str;
304
305 /* check password in connection string if not superuser */
307
308 /* first time, allocate or get the custom wait event */
309 if (dblink_we_connect == 0)
310 dblink_we_connect = WaitEventExtensionNew("DblinkConnect");
311
312 /* OK to make connection */
314
316 {
317 msg = pchomp(PQerrorMessage(conn));
319 if (rconn)
320 pfree(rconn);
321
323 (errcode(ERRCODE_SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION),
324 errmsg("could not establish connection"),
325 errdetail_internal("%s", msg)));
326 }
327
328 /* check password actually used if not superuser */
330
331 /* attempt to set client encoding to match server encoding, if needed */
334
335 if (connname)
336 {
337 rconn->conn = conn;
338 createNewConnection(connname, rconn);
339 }
340 else
341 {
342 if (pconn->conn)
344 pconn->conn = conn;
345 }
346
348}
349
350/*
351 * Clear a persistent connection to another database
352 */
354Datum
356{
357 char *conname = NULL;
358 remoteConn *rconn = NULL;
359 PGconn *conn = NULL;
360
361 dblink_init();
362
363 if (PG_NARGS() == 1)
364 {
366 rconn = getConnectionByName(conname);
367 if (rconn)
368 conn = rconn->conn;
369 }
370 else
371 conn = pconn->conn;
372
373 if (!conn)
374 dblink_conn_not_avail(conname);
375
377 if (rconn)
378 {
379 deleteConnection(conname);
380 pfree(rconn);
381 }
382 else
383 pconn->conn = NULL;
384
386}
387
388/*
389 * opens a cursor using a persistent connection
390 */
392Datum
394{
395 PGresult *res = NULL;
396 PGconn *conn;
397 char *curname = NULL;
398 char *sql = NULL;
399 char *conname = NULL;
401 remoteConn *rconn = NULL;
402 bool fail = true; /* default to backward compatible behavior */
403
404 dblink_init();
406
407 if (PG_NARGS() == 2)
408 {
409 /* text,text */
412 rconn = pconn;
413 }
414 else if (PG_NARGS() == 3)
415 {
416 /* might be text,text,text or text,text,bool */
417 if (get_fn_expr_argtype(fcinfo->flinfo, 2) == BOOLOID)
418 {
421 fail = PG_GETARG_BOOL(2);
422 rconn = pconn;
423 }
424 else
425 {
429 rconn = getConnectionByName(conname);
430 }
431 }
432 else if (PG_NARGS() == 4)
433 {
434 /* text,text,text,bool */
438 fail = PG_GETARG_BOOL(3);
439 rconn = getConnectionByName(conname);
440 }
441
442 if (!rconn || !rconn->conn)
443 dblink_conn_not_avail(conname);
444
445 conn = rconn->conn;
446
447 /* If we are not in a transaction, start one */
449 {
452 dblink_res_internalerror(conn, res, "begin error");
453 PQclear(res);
454 rconn->newXactForCursor = true;
455
456 /*
457 * Since transaction state was IDLE, we force cursor count to
458 * initially be 0. This is needed as a previous ABORT might have wiped
459 * out our transaction without maintaining the cursor count for us.
460 */
461 rconn->openCursorCount = 0;
462 }
463
464 /* if we started a transaction, increment cursor count */
465 if (rconn->newXactForCursor)
466 (rconn->openCursorCount)++;
467
468 appendStringInfo(&buf, "DECLARE %s CURSOR FOR %s", curname, sql);
471 {
472 dblink_res_error(conn, conname, res, fail,
473 "while opening cursor \"%s\"", curname);
475 }
476
477 PQclear(res);
479}
480
481/*
482 * closes a cursor
483 */
485Datum
487{
488 PGconn *conn;
489 PGresult *res = NULL;
490 char *curname = NULL;
491 char *conname = NULL;
493 remoteConn *rconn = NULL;
494 bool fail = true; /* default to backward compatible behavior */
495
496 dblink_init();
498
499 if (PG_NARGS() == 1)
500 {
501 /* text */
503 rconn = pconn;
504 }
505 else if (PG_NARGS() == 2)
506 {
507 /* might be text,text or text,bool */
508 if (get_fn_expr_argtype(fcinfo->flinfo, 1) == BOOLOID)
509 {
511 fail = PG_GETARG_BOOL(1);
512 rconn = pconn;
513 }
514 else
515 {
518 rconn = getConnectionByName(conname);
519 }
520 }
521 if (PG_NARGS() == 3)
522 {
523 /* text,text,bool */
526 fail = PG_GETARG_BOOL(2);
527 rconn = getConnectionByName(conname);
528 }
529
530 if (!rconn || !rconn->conn)
531 dblink_conn_not_avail(conname);
532
533 conn = rconn->conn;
534
535 appendStringInfo(&buf, "CLOSE %s", curname);
536
537 /* close the cursor */
540 {
541 dblink_res_error(conn, conname, res, fail,
542 "while closing cursor \"%s\"", curname);
544 }
545
546 PQclear(res);
547
548 /* if we started a transaction, decrement cursor count */
549 if (rconn->newXactForCursor)
550 {
551 (rconn->openCursorCount)--;
552
553 /* if count is zero, commit the transaction */
554 if (rconn->openCursorCount == 0)
555 {
556 rconn->newXactForCursor = false;
557
560 dblink_res_internalerror(conn, res, "commit error");
561 PQclear(res);
562 }
563 }
564
566}
567
568/*
569 * Fetch results from an open cursor
570 */
572Datum
574{
575 PGresult *res = NULL;
576 char *conname = NULL;
577 remoteConn *rconn = NULL;
578 PGconn *conn = NULL;
580 char *curname = NULL;
581 int howmany = 0;
582 bool fail = true; /* default to backward compatible */
583
584 prepTuplestoreResult(fcinfo);
585
586 dblink_init();
587
588 if (PG_NARGS() == 4)
589 {
590 /* text,text,int,bool */
593 howmany = PG_GETARG_INT32(2);
594 fail = PG_GETARG_BOOL(3);
595
596 rconn = getConnectionByName(conname);
597 if (rconn)
598 conn = rconn->conn;
599 }
600 else if (PG_NARGS() == 3)
601 {
602 /* text,text,int or text,int,bool */
603 if (get_fn_expr_argtype(fcinfo->flinfo, 2) == BOOLOID)
604 {
606 howmany = PG_GETARG_INT32(1);
607 fail = PG_GETARG_BOOL(2);
608 conn = pconn->conn;
609 }
610 else
611 {
614 howmany = PG_GETARG_INT32(2);
615
616 rconn = getConnectionByName(conname);
617 if (rconn)
618 conn = rconn->conn;
619 }
620 }
621 else if (PG_NARGS() == 2)
622 {
623 /* text,int */
625 howmany = PG_GETARG_INT32(1);
626 conn = pconn->conn;
627 }
628
629 if (!conn)
630 dblink_conn_not_avail(conname);
631
633 appendStringInfo(&buf, "FETCH %d FROM %s", howmany, curname);
634
635 /*
636 * Try to execute the query. Note that since libpq uses malloc, the
637 * PGresult will be long-lived even though we are still in a short-lived
638 * memory context.
639 */
641 if (!res ||
644 {
645 dblink_res_error(conn, conname, res, fail,
646 "while fetching from cursor \"%s\"", curname);
647 return (Datum) 0;
648 }
650 {
651 /* cursor does not exist - closed already or bad name */
652 PQclear(res);
654 (errcode(ERRCODE_INVALID_CURSOR_NAME),
655 errmsg("cursor \"%s\" does not exist", curname)));
656 }
657
658 materializeResult(fcinfo, conn, res);
659 return (Datum) 0;
660}
661
662/*
663 * Note: this is the new preferred version of dblink
664 */
666Datum
668{
669 return dblink_record_internal(fcinfo, false);
670}
671
673Datum
675{
676 PGconn *conn;
677 char *sql;
678 int retval;
679
680 if (PG_NARGS() == 2)
681 {
684 }
685 else
686 /* shouldn't happen */
687 elog(ERROR, "wrong number of arguments");
688
689 /* async query send */
690 retval = PQsendQuery(conn, sql);
691 if (retval != 1)
692 elog(NOTICE, "could not send query: %s", pchomp(PQerrorMessage(conn)));
693
694 PG_RETURN_INT32(retval);
695}
696
698Datum
700{
701 return dblink_record_internal(fcinfo, true);
702}
703
704static Datum
706{
707 PGconn *volatile conn = NULL;
708 volatile bool freeconn = false;
709
710 prepTuplestoreResult(fcinfo);
711
712 dblink_init();
713
714 PG_TRY();
715 {
716 char *sql = NULL;
717 char *conname = NULL;
718 bool fail = true; /* default to backward compatible */
719
720 if (!is_async)
721 {
722 if (PG_NARGS() == 3)
723 {
724 /* text,text,bool */
727 fail = PG_GETARG_BOOL(2);
728 dblink_get_conn(conname, &conn, &conname, &freeconn);
729 }
730 else if (PG_NARGS() == 2)
731 {
732 /* text,text or text,bool */
733 if (get_fn_expr_argtype(fcinfo->flinfo, 1) == BOOLOID)
734 {
736 fail = PG_GETARG_BOOL(1);
737 conn = pconn->conn;
738 }
739 else
740 {
743 dblink_get_conn(conname, &conn, &conname, &freeconn);
744 }
745 }
746 else if (PG_NARGS() == 1)
747 {
748 /* text */
749 conn = pconn->conn;
751 }
752 else
753 /* shouldn't happen */
754 elog(ERROR, "wrong number of arguments");
755 }
756 else /* is_async */
757 {
758 /* get async result */
760
761 if (PG_NARGS() == 2)
762 {
763 /* text,bool */
764 fail = PG_GETARG_BOOL(1);
765 conn = dblink_get_named_conn(conname);
766 }
767 else if (PG_NARGS() == 1)
768 {
769 /* text */
770 conn = dblink_get_named_conn(conname);
771 }
772 else
773 /* shouldn't happen */
774 elog(ERROR, "wrong number of arguments");
775 }
776
777 if (!conn)
778 dblink_conn_not_avail(conname);
779
780 if (!is_async)
781 {
782 /* synchronous query, use efficient tuple collection method */
783 materializeQueryResult(fcinfo, conn, conname, sql, fail);
784 }
785 else
786 {
787 /* async result retrieval, do it the old way */
789
790 /* NULL means we're all done with the async results */
791 if (res)
792 {
795 {
796 dblink_res_error(conn, conname, res, fail,
797 "while executing query");
798 /* if fail isn't set, we'll return an empty query result */
799 }
800 else
801 {
802 materializeResult(fcinfo, conn, res);
803 }
804 }
805 }
806 }
807 PG_FINALLY();
808 {
809 /* if needed, close the connection to the database */
810 if (freeconn)
812 }
813 PG_END_TRY();
814
815 return (Datum) 0;
816}
817
818/*
819 * Verify function caller can handle a tuplestore result, and set up for that.
820 *
821 * Note: if the caller returns without actually creating a tuplestore, the
822 * executor will treat the function result as an empty set.
823 */
824static void
826{
827 ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
828
829 /* check to see if query supports us returning a tuplestore */
830 if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
832 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
833 errmsg("set-valued function called in context that cannot accept a set")));
834 if (!(rsinfo->allowedModes & SFRM_Materialize))
836 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
837 errmsg("materialize mode required, but it is not allowed in this context")));
838
839 /* let the executor know we're sending back a tuplestore */
841
842 /* caller must fill these to return a non-empty result */
843 rsinfo->setResult = NULL;
844 rsinfo->setDesc = NULL;
845}
846
847/*
848 * Copy the contents of the PGresult into a tuplestore to be returned
849 * as the result of the current function.
850 * The PGresult will be released in this function.
851 */
852static void
854{
855 ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
856
857 /* prepTuplestoreResult must have been called previously */
859
860 PG_TRY();
861 {
862 TupleDesc tupdesc;
863 bool is_sql_cmd;
864 int ntuples;
865 int nfields;
866
868 {
869 is_sql_cmd = true;
870
871 /*
872 * need a tuple descriptor representing one TEXT column to return
873 * the command status string as our result tuple
874 */
875 tupdesc = CreateTemplateTupleDesc(1);
876 TupleDescInitEntry(tupdesc, (AttrNumber) 1, "status",
877 TEXTOID, -1, 0);
878 ntuples = 1;
879 nfields = 1;
880 }
881 else
882 {
884
885 is_sql_cmd = false;
886
887 /* get a tuple descriptor for our result type */
888 switch (get_call_result_type(fcinfo, NULL, &tupdesc))
889 {
891 /* success */
892 break;
893 case TYPEFUNC_RECORD:
894 /* failed to determine actual type of RECORD */
896 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
897 errmsg("function returning record called in context "
898 "that cannot accept type record")));
899 break;
900 default:
901 /* result type isn't composite */
902 elog(ERROR, "return type must be a row type");
903 break;
904 }
905
906 /* make sure we have a persistent copy of the tupdesc */
907 tupdesc = CreateTupleDescCopy(tupdesc);
908 ntuples = PQntuples(res);
909 nfields = PQnfields(res);
910 }
911
912 /*
913 * check result and tuple descriptor have the same number of columns
914 */
915 if (nfields != tupdesc->natts)
917 (errcode(ERRCODE_DATATYPE_MISMATCH),
918 errmsg("remote query result rowtype does not match "
919 "the specified FROM clause rowtype")));
920
921 if (ntuples > 0)
922 {
923 AttInMetadata *attinmeta;
924 int nestlevel = -1;
925 Tuplestorestate *tupstore;
926 MemoryContext oldcontext;
927 int row;
928 char **values;
929
930 attinmeta = TupleDescGetAttInMetadata(tupdesc);
931
932 /* Set GUCs to ensure we read GUC-sensitive data types correctly */
933 if (!is_sql_cmd)
934 nestlevel = applyRemoteGucs(conn);
935
937 tupstore = tuplestore_begin_heap(true, false, work_mem);
938 rsinfo->setResult = tupstore;
939 rsinfo->setDesc = tupdesc;
940 MemoryContextSwitchTo(oldcontext);
941
942 values = palloc_array(char *, nfields);
943
944 /* put all tuples into the tuplestore */
945 for (row = 0; row < ntuples; row++)
946 {
947 HeapTuple tuple;
948
949 if (!is_sql_cmd)
950 {
951 int i;
952
953 for (i = 0; i < nfields; i++)
954 {
955 if (PQgetisnull(res, row, i))
956 values[i] = NULL;
957 else
958 values[i] = PQgetvalue(res, row, i);
959 }
960 }
961 else
962 {
963 values[0] = PQcmdStatus(res);
964 }
965
966 /* build the tuple and put it into the tuplestore. */
967 tuple = BuildTupleFromCStrings(attinmeta, values);
968 tuplestore_puttuple(tupstore, tuple);
969 }
970
971 /* clean up GUC settings, if we changed any */
972 restoreLocalGucs(nestlevel);
973 }
974 }
975 PG_FINALLY();
976 {
977 /* be sure to release the libpq result */
978 PQclear(res);
979 }
980 PG_END_TRY();
981}
982
983/*
984 * Execute the given SQL command and store its results into a tuplestore
985 * to be returned as the result of the current function.
986 *
987 * This is equivalent to PQexec followed by materializeResult, but we make
988 * use of libpq's single-row mode to avoid accumulating the whole result
989 * inside libpq before it gets transferred to the tuplestore.
990 */
991static void
993 PGconn *conn,
994 const char *conname,
995 const char *sql,
996 bool fail)
997{
998 ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
999 PGresult *volatile res = NULL;
1000 volatile storeInfo sinfo = {0};
1001
1002 /* prepTuplestoreResult must have been called previously */
1003 Assert(rsinfo->returnMode == SFRM_Materialize);
1004
1005 sinfo.fcinfo = fcinfo;
1006
1007 PG_TRY();
1008 {
1009 /* Create short-lived memory context for data conversions */
1011 "dblink temporary context",
1013
1014 /* execute query, collecting any tuples into the tuplestore */
1015 res = storeQueryResult(&sinfo, conn, sql);
1016
1017 if (!res ||
1020 {
1021 /*
1022 * dblink_res_error will clear the passed PGresult, so we need
1023 * this ugly dance to avoid doing so twice during error exit
1024 */
1025 PGresult *res1 = res;
1026
1027 res = NULL;
1028 dblink_res_error(conn, conname, res1, fail,
1029 "while executing query");
1030 /* if fail isn't set, we'll return an empty query result */
1031 }
1032 else if (PQresultStatus(res) == PGRES_COMMAND_OK)
1033 {
1034 /*
1035 * storeRow didn't get called, so we need to convert the command
1036 * status string to a tuple manually
1037 */
1038 TupleDesc tupdesc;
1039 AttInMetadata *attinmeta;
1040 Tuplestorestate *tupstore;
1041 HeapTuple tuple;
1042 char *values[1];
1043 MemoryContext oldcontext;
1044
1045 /*
1046 * need a tuple descriptor representing one TEXT column to return
1047 * the command status string as our result tuple
1048 */
1049 tupdesc = CreateTemplateTupleDesc(1);
1050 TupleDescInitEntry(tupdesc, (AttrNumber) 1, "status",
1051 TEXTOID, -1, 0);
1052 attinmeta = TupleDescGetAttInMetadata(tupdesc);
1053
1054 oldcontext = MemoryContextSwitchTo(rsinfo->econtext->ecxt_per_query_memory);
1055 tupstore = tuplestore_begin_heap(true, false, work_mem);
1056 rsinfo->setResult = tupstore;
1057 rsinfo->setDesc = tupdesc;
1058 MemoryContextSwitchTo(oldcontext);
1059
1060 values[0] = PQcmdStatus(res);
1061
1062 /* build the tuple and put it into the tuplestore. */
1063 tuple = BuildTupleFromCStrings(attinmeta, values);
1064 tuplestore_puttuple(tupstore, tuple);
1065
1066 PQclear(res);
1067 res = NULL;
1068 }
1069 else
1070 {
1072 /* storeRow should have created a tuplestore */
1073 Assert(rsinfo->setResult != NULL);
1074
1075 PQclear(res);
1076 res = NULL;
1077 }
1078
1079 /* clean up data conversion short-lived memory context */
1080 if (sinfo.tmpcontext != NULL)
1081 MemoryContextDelete(sinfo.tmpcontext);
1082 sinfo.tmpcontext = NULL;
1083
1084 PQclear(sinfo.last_res);
1085 sinfo.last_res = NULL;
1086 PQclear(sinfo.cur_res);
1087 sinfo.cur_res = NULL;
1088 }
1089 PG_CATCH();
1090 {
1091 /* be sure to release any libpq result we collected */
1092 PQclear(res);
1093 PQclear(sinfo.last_res);
1094 PQclear(sinfo.cur_res);
1095 /* and clear out any pending data in libpq */
1097 NULL)
1098 PQclear(res);
1099 PG_RE_THROW();
1100 }
1101 PG_END_TRY();
1102}
1103
1104/*
1105 * Execute query, and send any result rows to sinfo->tuplestore.
1106 */
1107static PGresult *
1108storeQueryResult(volatile storeInfo *sinfo, PGconn *conn, const char *sql)
1109{
1110 bool first = true;
1111 int nestlevel = -1;
1112 PGresult *res;
1113
1114 if (!PQsendQuery(conn, sql))
1115 elog(ERROR, "could not send query: %s", pchomp(PQerrorMessage(conn)));
1116
1117 if (!PQsetSingleRowMode(conn)) /* shouldn't fail */
1118 elog(ERROR, "failed to set single-row mode for dblink query");
1119
1120 for (;;)
1121 {
1123
1125 if (!sinfo->cur_res)
1126 break;
1127
1129 {
1130 /* got one row from possibly-bigger resultset */
1131
1132 /*
1133 * Set GUCs to ensure we read GUC-sensitive data types correctly.
1134 * We shouldn't do this until we have a row in hand, to ensure
1135 * libpq has seen any earlier ParameterStatus protocol messages.
1136 */
1137 if (first && nestlevel < 0)
1138 nestlevel = applyRemoteGucs(conn);
1139
1140 storeRow(sinfo, sinfo->cur_res, first);
1141
1142 PQclear(sinfo->cur_res);
1143 sinfo->cur_res = NULL;
1144 first = false;
1145 }
1146 else
1147 {
1148 /* if empty resultset, fill tuplestore header */
1149 if (first && PQresultStatus(sinfo->cur_res) == PGRES_TUPLES_OK)
1150 storeRow(sinfo, sinfo->cur_res, first);
1151
1152 /* store completed result at last_res */
1153 PQclear(sinfo->last_res);
1154 sinfo->last_res = sinfo->cur_res;
1155 sinfo->cur_res = NULL;
1156 first = true;
1157 }
1158 }
1159
1160 /* clean up GUC settings, if we changed any */
1161 restoreLocalGucs(nestlevel);
1162
1163 /* return last_res */
1164 res = sinfo->last_res;
1165 sinfo->last_res = NULL;
1166 return res;
1167}
1168
1169/*
1170 * Send single row to sinfo->tuplestore.
1171 *
1172 * If "first" is true, create the tuplestore using PGresult's metadata
1173 * (in this case the PGresult might contain either zero or one row).
1174 */
1175static void
1176storeRow(volatile storeInfo *sinfo, PGresult *res, bool first)
1177{
1178 int nfields = PQnfields(res);
1179 HeapTuple tuple;
1180 int i;
1181 MemoryContext oldcontext;
1182
1183 if (first)
1184 {
1185 /* Prepare for new result set */
1186 ReturnSetInfo *rsinfo = (ReturnSetInfo *) sinfo->fcinfo->resultinfo;
1187 TupleDesc tupdesc;
1188
1189 /*
1190 * It's possible to get more than one result set if the query string
1191 * contained multiple SQL commands. In that case, we follow PQexec's
1192 * traditional behavior of throwing away all but the last result.
1193 */
1194 if (sinfo->tuplestore)
1195 tuplestore_end(sinfo->tuplestore);
1196 sinfo->tuplestore = NULL;
1197
1198 /* get a tuple descriptor for our result type */
1199 switch (get_call_result_type(sinfo->fcinfo, NULL, &tupdesc))
1200 {
1201 case TYPEFUNC_COMPOSITE:
1202 /* success */
1203 break;
1204 case TYPEFUNC_RECORD:
1205 /* failed to determine actual type of RECORD */
1206 ereport(ERROR,
1207 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1208 errmsg("function returning record called in context "
1209 "that cannot accept type record")));
1210 break;
1211 default:
1212 /* result type isn't composite */
1213 elog(ERROR, "return type must be a row type");
1214 break;
1215 }
1216
1217 /* make sure we have a persistent copy of the tupdesc */
1218 tupdesc = CreateTupleDescCopy(tupdesc);
1219
1220 /* check result and tuple descriptor have the same number of columns */
1221 if (nfields != tupdesc->natts)
1222 ereport(ERROR,
1223 (errcode(ERRCODE_DATATYPE_MISMATCH),
1224 errmsg("remote query result rowtype does not match "
1225 "the specified FROM clause rowtype")));
1226
1227 /* Prepare attinmeta for later data conversions */
1228 sinfo->attinmeta = TupleDescGetAttInMetadata(tupdesc);
1229
1230 /* Create a new, empty tuplestore */
1232 sinfo->tuplestore = tuplestore_begin_heap(true, false, work_mem);
1233 rsinfo->setResult = sinfo->tuplestore;
1234 rsinfo->setDesc = tupdesc;
1235 MemoryContextSwitchTo(oldcontext);
1236
1237 /* Done if empty resultset */
1238 if (PQntuples(res) == 0)
1239 return;
1240
1241 /*
1242 * Set up sufficiently-wide string pointers array; this won't change
1243 * in size so it's easy to preallocate.
1244 */
1245 if (sinfo->cstrs)
1246 pfree(sinfo->cstrs);
1247 sinfo->cstrs = palloc_array(char *, nfields);
1248 }
1249
1250 /* Should have a single-row result if we get here */
1251 Assert(PQntuples(res) == 1);
1252
1253 /*
1254 * Do the following work in a temp context that we reset after each tuple.
1255 * This cleans up not only the data we have direct access to, but any
1256 * cruft the I/O functions might leak.
1257 */
1258 oldcontext = MemoryContextSwitchTo(sinfo->tmpcontext);
1259
1260 /*
1261 * Fill cstrs with null-terminated strings of column values.
1262 */
1263 for (i = 0; i < nfields; i++)
1264 {
1265 if (PQgetisnull(res, 0, i))
1266 sinfo->cstrs[i] = NULL;
1267 else
1268 sinfo->cstrs[i] = PQgetvalue(res, 0, i);
1269 }
1270
1271 /* Convert row to a tuple, and add it to the tuplestore */
1272 tuple = BuildTupleFromCStrings(sinfo->attinmeta, sinfo->cstrs);
1273
1274 tuplestore_puttuple(sinfo->tuplestore, tuple);
1275
1276 /* Clean up */
1277 MemoryContextSwitchTo(oldcontext);
1279}
1280
1281/*
1282 * List all open dblink connections by name.
1283 * Returns an array of all connection names.
1284 * Takes no params
1285 */
1287Datum
1289{
1290 HASH_SEQ_STATUS status;
1291 remoteConnHashEnt *hentry;
1292 ArrayBuildState *astate = NULL;
1293
1294 if (remoteConnHash)
1295 {
1296 hash_seq_init(&status, remoteConnHash);
1297 while ((hentry = (remoteConnHashEnt *) hash_seq_search(&status)) != NULL)
1298 {
1299 /* stash away current value */
1300 astate = accumArrayResult(astate,
1301 CStringGetTextDatum(hentry->name),
1302 false, TEXTOID, CurrentMemoryContext);
1303 }
1304 }
1305
1306 if (astate)
1309 else
1311}
1312
1313/*
1314 * Checks if a given remote connection is busy
1315 *
1316 * Returns 1 if the connection is busy, 0 otherwise
1317 * Params:
1318 * text connection_name - name of the connection to check
1319 *
1320 */
1322Datum
1324{
1325 PGconn *conn;
1326
1327 dblink_init();
1329
1332}
1333
1334/*
1335 * Cancels a running request on a connection
1336 *
1337 * Returns text:
1338 * "OK" if the cancel request has been sent correctly,
1339 * an error message otherwise
1340 *
1341 * Params:
1342 * text connection_name - name of the connection to check
1343 *
1344 */
1346Datum
1348{
1349 PGconn *conn;
1350 const char *msg;
1351 TimestampTz endtime;
1352
1353 dblink_init();
1356 30000);
1357 msg = libpqsrv_cancel(conn, endtime);
1358 if (msg == NULL)
1359 msg = "OK";
1360
1362}
1363
1364
1365/*
1366 * Get error message from a connection
1367 *
1368 * Returns text:
1369 * "OK" if no error, an error message otherwise
1370 *
1371 * Params:
1372 * text connection_name - name of the connection to check
1373 *
1374 */
1376Datum
1378{
1379 char *msg;
1380 PGconn *conn;
1381
1382 dblink_init();
1384
1385 msg = PQerrorMessage(conn);
1386 if (msg == NULL || msg[0] == '\0')
1388 else
1390}
1391
1392/*
1393 * Execute an SQL non-SELECT command
1394 */
1396Datum
1398{
1399 text *volatile sql_cmd_status = NULL;
1400 PGconn *volatile conn = NULL;
1401 volatile bool freeconn = false;
1402
1403 dblink_init();
1404
1405 PG_TRY();
1406 {
1407 PGresult *res = NULL;
1408 char *sql = NULL;
1409 char *conname = NULL;
1410 bool fail = true; /* default to backward compatible behavior */
1411
1412 if (PG_NARGS() == 3)
1413 {
1414 /* must be text,text,bool */
1415 conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
1417 fail = PG_GETARG_BOOL(2);
1418 dblink_get_conn(conname, &conn, &conname, &freeconn);
1419 }
1420 else if (PG_NARGS() == 2)
1421 {
1422 /* might be text,text or text,bool */
1423 if (get_fn_expr_argtype(fcinfo->flinfo, 1) == BOOLOID)
1424 {
1426 fail = PG_GETARG_BOOL(1);
1427 conn = pconn->conn;
1428 }
1429 else
1430 {
1431 conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
1433 dblink_get_conn(conname, &conn, &conname, &freeconn);
1434 }
1435 }
1436 else if (PG_NARGS() == 1)
1437 {
1438 /* must be single text argument */
1439 conn = pconn->conn;
1441 }
1442 else
1443 /* shouldn't happen */
1444 elog(ERROR, "wrong number of arguments");
1445
1446 if (!conn)
1447 dblink_conn_not_avail(conname);
1448
1450 if (!res ||
1453 {
1454 dblink_res_error(conn, conname, res, fail,
1455 "while executing command");
1456
1457 /*
1458 * and save a copy of the command status string to return as our
1459 * result tuple
1460 */
1461 sql_cmd_status = cstring_to_text("ERROR");
1462 }
1463 else if (PQresultStatus(res) == PGRES_COMMAND_OK)
1464 {
1465 /*
1466 * and save a copy of the command status string to return as our
1467 * result tuple
1468 */
1469 sql_cmd_status = cstring_to_text(PQcmdStatus(res));
1470 PQclear(res);
1471 }
1472 else
1473 {
1474 PQclear(res);
1475 ereport(ERROR,
1476 (errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED),
1477 errmsg("statement returning results not allowed")));
1478 }
1479 }
1480 PG_FINALLY();
1481 {
1482 /* if needed, close the connection to the database */
1483 if (freeconn)
1485 }
1486 PG_END_TRY();
1487
1488 PG_RETURN_TEXT_P(sql_cmd_status);
1489}
1490
1491
1492/*
1493 * dblink_get_pkey
1494 *
1495 * Return list of primary key fields for the supplied relation,
1496 * or NULL if none exists.
1497 */
1499Datum
1501{
1502 int16 indnkeyatts;
1503 char **results;
1504 FuncCallContext *funcctx;
1505 int32 call_cntr;
1506 int32 max_calls;
1507 AttInMetadata *attinmeta;
1508 MemoryContext oldcontext;
1509
1510 /* stuff done only on the first call of the function */
1511 if (SRF_IS_FIRSTCALL())
1512 {
1513 Relation rel;
1514 TupleDesc tupdesc;
1515
1516 /* create a function context for cross-call persistence */
1517 funcctx = SRF_FIRSTCALL_INIT();
1518
1519 /*
1520 * switch to memory context appropriate for multiple function calls
1521 */
1522 oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
1523
1524 /* open target relation */
1526
1527 /* get the array of attnums */
1528 results = get_pkey_attnames(rel, &indnkeyatts);
1529
1531
1532 /*
1533 * need a tuple descriptor representing one INT and one TEXT column
1534 */
1535 tupdesc = CreateTemplateTupleDesc(2);
1536 TupleDescInitEntry(tupdesc, (AttrNumber) 1, "position",
1537 INT4OID, -1, 0);
1538 TupleDescInitEntry(tupdesc, (AttrNumber) 2, "colname",
1539 TEXTOID, -1, 0);
1540
1541 /*
1542 * Generate attribute metadata needed later to produce tuples from raw
1543 * C strings
1544 */
1545 attinmeta = TupleDescGetAttInMetadata(tupdesc);
1546 funcctx->attinmeta = attinmeta;
1547
1548 if ((results != NULL) && (indnkeyatts > 0))
1549 {
1550 funcctx->max_calls = indnkeyatts;
1551
1552 /* got results, keep track of them */
1553 funcctx->user_fctx = results;
1554 }
1555 else
1556 {
1557 /* fast track when no results */
1558 MemoryContextSwitchTo(oldcontext);
1559 SRF_RETURN_DONE(funcctx);
1560 }
1561
1562 MemoryContextSwitchTo(oldcontext);
1563 }
1564
1565 /* stuff done on every call of the function */
1566 funcctx = SRF_PERCALL_SETUP();
1567
1568 /*
1569 * initialize per-call variables
1570 */
1571 call_cntr = funcctx->call_cntr;
1572 max_calls = funcctx->max_calls;
1573
1574 results = (char **) funcctx->user_fctx;
1575 attinmeta = funcctx->attinmeta;
1576
1577 if (call_cntr < max_calls) /* do when there is more left to send */
1578 {
1579 char **values;
1580 HeapTuple tuple;
1581 Datum result;
1582
1583 values = palloc_array(char *, 2);
1584 values[0] = psprintf("%d", call_cntr + 1);
1585 values[1] = results[call_cntr];
1586
1587 /* build the tuple */
1588 tuple = BuildTupleFromCStrings(attinmeta, values);
1589
1590 /* make the tuple into a datum */
1591 result = HeapTupleGetDatum(tuple);
1592
1593 SRF_RETURN_NEXT(funcctx, result);
1594 }
1595 else
1596 {
1597 /* do when there is no more left */
1598 SRF_RETURN_DONE(funcctx);
1599 }
1600}
1601
1602
1603/*
1604 * dblink_build_sql_insert
1605 *
1606 * Used to generate an SQL insert statement
1607 * based on an existing tuple in a local relation.
1608 * This is useful for selectively replicating data
1609 * to another server via dblink.
1610 *
1611 * API:
1612 * <relname> - name of local table of interest
1613 * <pkattnums> - an int2vector of attnums which will be used
1614 * to identify the local tuple of interest
1615 * <pknumatts> - number of attnums in pkattnums
1616 * <src_pkattvals_arry> - text array of key values which will be used
1617 * to identify the local tuple of interest
1618 * <tgt_pkattvals_arry> - text array of key values which will be used
1619 * to build the string for execution remotely. These are substituted
1620 * for their counterparts in src_pkattvals_arry
1621 */
1623Datum
1625{
1626 text *relname_text = PG_GETARG_TEXT_PP(0);
1627 int2vector *pkattnums_arg = (int2vector *) PG_GETARG_POINTER(1);
1628 int32 pknumatts_arg = PG_GETARG_INT32(2);
1629 ArrayType *src_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
1630 ArrayType *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(4);
1631 Relation rel;
1632 int *pkattnums;
1633 int pknumatts;
1634 char **src_pkattvals;
1635 char **tgt_pkattvals;
1636 int src_nitems;
1637 int tgt_nitems;
1638 char *sql;
1639
1640 /*
1641 * Open target relation.
1642 */
1643 rel = get_rel_from_relname(relname_text, AccessShareLock, ACL_SELECT);
1644
1645 /*
1646 * Process pkattnums argument.
1647 */
1648 validate_pkattnums(rel, pkattnums_arg, pknumatts_arg,
1649 &pkattnums, &pknumatts);
1650
1651 /*
1652 * Source array is made up of key values that will be used to locate the
1653 * tuple of interest from the local system.
1654 */
1655 src_pkattvals = get_text_array_contents(src_pkattvals_arry, &src_nitems);
1656
1657 /*
1658 * There should be one source array key value for each key attnum
1659 */
1660 if (src_nitems != pknumatts)
1661 ereport(ERROR,
1662 (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
1663 errmsg("source key array length must match number of key attributes")));
1664
1665 /*
1666 * Target array is made up of key values that will be used to build the
1667 * SQL string for use on the remote system.
1668 */
1669 tgt_pkattvals = get_text_array_contents(tgt_pkattvals_arry, &tgt_nitems);
1670
1671 /*
1672 * There should be one target array key value for each key attnum
1673 */
1674 if (tgt_nitems != pknumatts)
1675 ereport(ERROR,
1676 (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
1677 errmsg("target key array length must match number of key attributes")));
1678
1679 /*
1680 * Prep work is finally done. Go get the SQL string.
1681 */
1682 sql = get_sql_insert(rel, pkattnums, pknumatts, src_pkattvals, tgt_pkattvals);
1683
1684 /*
1685 * Now we can close the relation.
1686 */
1688
1689 /*
1690 * And send it
1691 */
1693}
1694
1695
1696/*
1697 * dblink_build_sql_delete
1698 *
1699 * Used to generate an SQL delete statement.
1700 * This is useful for selectively replicating a
1701 * delete to another server via dblink.
1702 *
1703 * API:
1704 * <relname> - name of remote table of interest
1705 * <pkattnums> - an int2vector of attnums which will be used
1706 * to identify the remote tuple of interest
1707 * <pknumatts> - number of attnums in pkattnums
1708 * <tgt_pkattvals_arry> - text array of key values which will be used
1709 * to build the string for execution remotely.
1710 */
1712Datum
1714{
1715 text *relname_text = PG_GETARG_TEXT_PP(0);
1716 int2vector *pkattnums_arg = (int2vector *) PG_GETARG_POINTER(1);
1717 int32 pknumatts_arg = PG_GETARG_INT32(2);
1718 ArrayType *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
1719 Relation rel;
1720 int *pkattnums;
1721 int pknumatts;
1722 char **tgt_pkattvals;
1723 int tgt_nitems;
1724 char *sql;
1725
1726 /*
1727 * Open target relation.
1728 */
1729 rel = get_rel_from_relname(relname_text, AccessShareLock, ACL_SELECT);
1730
1731 /*
1732 * Process pkattnums argument.
1733 */
1734 validate_pkattnums(rel, pkattnums_arg, pknumatts_arg,
1735 &pkattnums, &pknumatts);
1736
1737 /*
1738 * Target array is made up of key values that will be used to build the
1739 * SQL string for use on the remote system.
1740 */
1741 tgt_pkattvals = get_text_array_contents(tgt_pkattvals_arry, &tgt_nitems);
1742
1743 /*
1744 * There should be one target array key value for each key attnum
1745 */
1746 if (tgt_nitems != pknumatts)
1747 ereport(ERROR,
1748 (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
1749 errmsg("target key array length must match number of key attributes")));
1750
1751 /*
1752 * Prep work is finally done. Go get the SQL string.
1753 */
1754 sql = get_sql_delete(rel, pkattnums, pknumatts, tgt_pkattvals);
1755
1756 /*
1757 * Now we can close the relation.
1758 */
1760
1761 /*
1762 * And send it
1763 */
1765}
1766
1767
1768/*
1769 * dblink_build_sql_update
1770 *
1771 * Used to generate an SQL update statement
1772 * based on an existing tuple in a local relation.
1773 * This is useful for selectively replicating data
1774 * to another server via dblink.
1775 *
1776 * API:
1777 * <relname> - name of local table of interest
1778 * <pkattnums> - an int2vector of attnums which will be used
1779 * to identify the local tuple of interest
1780 * <pknumatts> - number of attnums in pkattnums
1781 * <src_pkattvals_arry> - text array of key values which will be used
1782 * to identify the local tuple of interest
1783 * <tgt_pkattvals_arry> - text array of key values which will be used
1784 * to build the string for execution remotely. These are substituted
1785 * for their counterparts in src_pkattvals_arry
1786 */
1788Datum
1790{
1791 text *relname_text = PG_GETARG_TEXT_PP(0);
1792 int2vector *pkattnums_arg = (int2vector *) PG_GETARG_POINTER(1);
1793 int32 pknumatts_arg = PG_GETARG_INT32(2);
1794 ArrayType *src_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
1795 ArrayType *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(4);
1796 Relation rel;
1797 int *pkattnums;
1798 int pknumatts;
1799 char **src_pkattvals;
1800 char **tgt_pkattvals;
1801 int src_nitems;
1802 int tgt_nitems;
1803 char *sql;
1804
1805 /*
1806 * Open target relation.
1807 */
1808 rel = get_rel_from_relname(relname_text, AccessShareLock, ACL_SELECT);
1809
1810 /*
1811 * Process pkattnums argument.
1812 */
1813 validate_pkattnums(rel, pkattnums_arg, pknumatts_arg,
1814 &pkattnums, &pknumatts);
1815
1816 /*
1817 * Source array is made up of key values that will be used to locate the
1818 * tuple of interest from the local system.
1819 */
1820 src_pkattvals = get_text_array_contents(src_pkattvals_arry, &src_nitems);
1821
1822 /*
1823 * There should be one source array key value for each key attnum
1824 */
1825 if (src_nitems != pknumatts)
1826 ereport(ERROR,
1827 (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
1828 errmsg("source key array length must match number of key attributes")));
1829
1830 /*
1831 * Target array is made up of key values that will be used to build the
1832 * SQL string for use on the remote system.
1833 */
1834 tgt_pkattvals = get_text_array_contents(tgt_pkattvals_arry, &tgt_nitems);
1835
1836 /*
1837 * There should be one target array key value for each key attnum
1838 */
1839 if (tgt_nitems != pknumatts)
1840 ereport(ERROR,
1841 (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
1842 errmsg("target key array length must match number of key attributes")));
1843
1844 /*
1845 * Prep work is finally done. Go get the SQL string.
1846 */
1847 sql = get_sql_update(rel, pkattnums, pknumatts, src_pkattvals, tgt_pkattvals);
1848
1849 /*
1850 * Now we can close the relation.
1851 */
1853
1854 /*
1855 * And send it
1856 */
1858}
1859
1860/*
1861 * dblink_current_query
1862 * return the current query string
1863 * to allow its use in (among other things)
1864 * rewrite rules
1865 */
1867Datum
1869{
1870 /* This is now just an alias for the built-in function current_query() */
1872}
1873
1874/*
1875 * Retrieve async notifications for a connection.
1876 *
1877 * Returns a setof record of notifications, or an empty set if none received.
1878 * Can optionally take a named connection as parameter, but uses the unnamed
1879 * connection per default.
1880 *
1881 */
1882#define DBLINK_NOTIFY_COLS 3
1883
1885Datum
1887{
1888 PGconn *conn;
1889 PGnotify *notify;
1890 ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
1891
1892 dblink_init();
1893 if (PG_NARGS() == 1)
1895 else
1896 conn = pconn->conn;
1897
1898 InitMaterializedSRF(fcinfo, 0);
1899
1901 while ((notify = PQnotifies(conn)) != NULL)
1902 {
1904 bool nulls[DBLINK_NOTIFY_COLS];
1905
1906 memset(values, 0, sizeof(values));
1907 memset(nulls, 0, sizeof(nulls));
1908
1909 if (notify->relname != NULL)
1910 values[0] = CStringGetTextDatum(notify->relname);
1911 else
1912 nulls[0] = true;
1913
1914 values[1] = Int32GetDatum(notify->be_pid);
1915
1916 if (notify->extra != NULL)
1917 values[2] = CStringGetTextDatum(notify->extra);
1918 else
1919 nulls[2] = true;
1920
1921 tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc, values, nulls);
1922
1923 PQfreemem(notify);
1925 }
1926
1927 return (Datum) 0;
1928}
1929
1930/*
1931 * Validate the options given to a dblink foreign server or user mapping.
1932 * Raise an error if any option is invalid.
1933 *
1934 * We just check the names of options here, so semantic errors in options,
1935 * such as invalid numeric format, will be detected at the attempt to connect.
1936 */
1938Datum
1940{
1941 List *options_list = untransformRelOptions(PG_GETARG_DATUM(0));
1943 ListCell *cell;
1944
1945 static const PQconninfoOption *options = NULL;
1946
1947 /*
1948 * Get list of valid libpq options.
1949 *
1950 * To avoid unnecessary work, we get the list once and use it throughout
1951 * the lifetime of this backend process. We don't need to care about
1952 * memory context issues, because PQconndefaults allocates with malloc.
1953 */
1954 if (!options)
1955 {
1957 if (!options) /* assume reason for failure is OOM */
1958 ereport(ERROR,
1959 (errcode(ERRCODE_FDW_OUT_OF_MEMORY),
1960 errmsg("out of memory"),
1961 errdetail("Could not get libpq's default connection options.")));
1962 }
1963
1964 /* Validate each supplied option. */
1965 foreach(cell, options_list)
1966 {
1967 DefElem *def = (DefElem *) lfirst(cell);
1968
1970 {
1971 /*
1972 * Unknown option, or invalid option for the context specified, so
1973 * complain about it. Provide a hint with a valid option that
1974 * looks similar, if there is one.
1975 */
1976 const PQconninfoOption *opt;
1977 const char *closest_match;
1979 bool has_valid_options = false;
1980
1982 for (opt = options; opt->keyword; opt++)
1983 {
1985 {
1986 has_valid_options = true;
1988 }
1989 }
1990
1991 closest_match = getClosestMatch(&match_state);
1992 ereport(ERROR,
1993 (errcode(ERRCODE_FDW_OPTION_NAME_NOT_FOUND),
1994 errmsg("invalid option \"%s\"", def->defname),
1995 has_valid_options ? closest_match ?
1996 errhint("Perhaps you meant the option \"%s\".",
1997 closest_match) : 0 :
1998 errhint("There are no valid options in this context.")));
1999 }
2000 }
2001
2003}
2004
2005
2006/*************************************************************
2007 * internal functions
2008 */
2009
2010
2011/*
2012 * get_pkey_attnames
2013 *
2014 * Get the primary key attnames for the given relation.
2015 * Return NULL, and set indnkeyatts = 0, if no primary key exists.
2016 */
2017static char **
2019{
2020 Relation indexRelation;
2021 ScanKeyData skey;
2022 SysScanDesc scan;
2023 HeapTuple indexTuple;
2024 int i;
2025 char **result = NULL;
2026 TupleDesc tupdesc;
2027
2028 /* initialize indnkeyatts to 0 in case no primary key exists */
2029 *indnkeyatts = 0;
2030
2031 tupdesc = rel->rd_att;
2032
2033 /* Prepare to scan pg_index for entries having indrelid = this rel. */
2034 indexRelation = table_open(IndexRelationId, AccessShareLock);
2035 ScanKeyInit(&skey,
2036 Anum_pg_index_indrelid,
2037 BTEqualStrategyNumber, F_OIDEQ,
2039
2040 scan = systable_beginscan(indexRelation, IndexIndrelidIndexId, true,
2041 NULL, 1, &skey);
2042
2043 while (HeapTupleIsValid(indexTuple = systable_getnext(scan)))
2044 {
2046
2047 /* we're only interested if it is the primary key */
2048 if (index->indisprimary)
2049 {
2050 *indnkeyatts = index->indnkeyatts;
2051 if (*indnkeyatts > 0)
2052 {
2053 result = palloc_array(char *, *indnkeyatts);
2054
2055 for (i = 0; i < *indnkeyatts; i++)
2056 result[i] = SPI_fname(tupdesc, index->indkey.values[i]);
2057 }
2058 break;
2059 }
2060 }
2061
2062 systable_endscan(scan);
2063 table_close(indexRelation, AccessShareLock);
2064
2065 return result;
2066}
2067
2068/*
2069 * Deconstruct a text[] into C-strings (note any NULL elements will be
2070 * returned as NULL pointers)
2071 */
2072static char **
2074{
2075 int ndim = ARR_NDIM(array);
2076 int *dims = ARR_DIMS(array);
2077 int nitems;
2078 int16 typlen;
2079 bool typbyval;
2080 char typalign;
2081 char **values;
2082 char *ptr;
2083 bits8 *bitmap;
2084 int bitmask;
2085 int i;
2086
2087 Assert(ARR_ELEMTYPE(array) == TEXTOID);
2088
2089 *numitems = nitems = ArrayGetNItems(ndim, dims);
2090
2092 &typlen, &typbyval, &typalign);
2093
2094 values = palloc_array(char *, nitems);
2095
2096 ptr = ARR_DATA_PTR(array);
2097 bitmap = ARR_NULLBITMAP(array);
2098 bitmask = 1;
2099
2100 for (i = 0; i < nitems; i++)
2101 {
2102 if (bitmap && (*bitmap & bitmask) == 0)
2103 {
2104 values[i] = NULL;
2105 }
2106 else
2107 {
2109 ptr = att_addlength_pointer(ptr, typlen, ptr);
2110 ptr = (char *) att_align_nominal(ptr, typalign);
2111 }
2112
2113 /* advance bitmap pointer if any */
2114 if (bitmap)
2115 {
2116 bitmask <<= 1;
2117 if (bitmask == 0x100)
2118 {
2119 bitmap++;
2120 bitmask = 1;
2121 }
2122 }
2123 }
2124
2125 return values;
2126}
2127
2128static char *
2129get_sql_insert(Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals, char **tgt_pkattvals)
2130{
2131 char *relname;
2132 HeapTuple tuple;
2133 TupleDesc tupdesc;
2134 int natts;
2136 char *val;
2137 int key;
2138 int i;
2139 bool needComma;
2140
2142
2143 /* get relation name including any needed schema prefix and quoting */
2145
2146 tupdesc = rel->rd_att;
2147 natts = tupdesc->natts;
2148
2149 tuple = get_tuple_of_interest(rel, pkattnums, pknumatts, src_pkattvals);
2150 if (!tuple)
2151 ereport(ERROR,
2152 (errcode(ERRCODE_CARDINALITY_VIOLATION),
2153 errmsg("source row not found")));
2154
2155 appendStringInfo(&buf, "INSERT INTO %s(", relname);
2156
2157 needComma = false;
2158 for (i = 0; i < natts; i++)
2159 {
2160 Form_pg_attribute att = TupleDescAttr(tupdesc, i);
2161
2162 if (att->attisdropped)
2163 continue;
2164
2165 if (needComma)
2167
2169 quote_ident_cstr(NameStr(att->attname)));
2170 needComma = true;
2171 }
2172
2173 appendStringInfoString(&buf, ") VALUES(");
2174
2175 /*
2176 * Note: i is physical column number (counting from 0).
2177 */
2178 needComma = false;
2179 for (i = 0; i < natts; i++)
2180 {
2181 if (TupleDescAttr(tupdesc, i)->attisdropped)
2182 continue;
2183
2184 if (needComma)
2186
2187 key = get_attnum_pk_pos(pkattnums, pknumatts, i);
2188
2189 if (key >= 0)
2190 val = tgt_pkattvals[key] ? pstrdup(tgt_pkattvals[key]) : NULL;
2191 else
2192 val = SPI_getvalue(tuple, tupdesc, i + 1);
2193
2194 if (val != NULL)
2195 {
2197 pfree(val);
2198 }
2199 else
2200 appendStringInfoString(&buf, "NULL");
2201 needComma = true;
2202 }
2204
2205 return buf.data;
2206}
2207
2208static char *
2209get_sql_delete(Relation rel, int *pkattnums, int pknumatts, char **tgt_pkattvals)
2210{
2211 char *relname;
2212 TupleDesc tupdesc;
2214 int i;
2215
2217
2218 /* get relation name including any needed schema prefix and quoting */
2220
2221 tupdesc = rel->rd_att;
2222
2223 appendStringInfo(&buf, "DELETE FROM %s WHERE ", relname);
2224 for (i = 0; i < pknumatts; i++)
2225 {
2226 int pkattnum = pkattnums[i];
2227 Form_pg_attribute attr = TupleDescAttr(tupdesc, pkattnum);
2228
2229 if (i > 0)
2230 appendStringInfoString(&buf, " AND ");
2231
2233 quote_ident_cstr(NameStr(attr->attname)));
2234
2235 if (tgt_pkattvals[i] != NULL)
2236 appendStringInfo(&buf, " = %s",
2237 quote_literal_cstr(tgt_pkattvals[i]));
2238 else
2239 appendStringInfoString(&buf, " IS NULL");
2240 }
2241
2242 return buf.data;
2243}
2244
2245static char *
2246get_sql_update(Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals, char **tgt_pkattvals)
2247{
2248 char *relname;
2249 HeapTuple tuple;
2250 TupleDesc tupdesc;
2251 int natts;
2253 char *val;
2254 int key;
2255 int i;
2256 bool needComma;
2257
2259
2260 /* get relation name including any needed schema prefix and quoting */
2262
2263 tupdesc = rel->rd_att;
2264 natts = tupdesc->natts;
2265
2266 tuple = get_tuple_of_interest(rel, pkattnums, pknumatts, src_pkattvals);
2267 if (!tuple)
2268 ereport(ERROR,
2269 (errcode(ERRCODE_CARDINALITY_VIOLATION),
2270 errmsg("source row not found")));
2271
2272 appendStringInfo(&buf, "UPDATE %s SET ", relname);
2273
2274 /*
2275 * Note: i is physical column number (counting from 0).
2276 */
2277 needComma = false;
2278 for (i = 0; i < natts; i++)
2279 {
2280 Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
2281
2282 if (attr->attisdropped)
2283 continue;
2284
2285 if (needComma)
2287
2288 appendStringInfo(&buf, "%s = ",
2289 quote_ident_cstr(NameStr(attr->attname)));
2290
2291 key = get_attnum_pk_pos(pkattnums, pknumatts, i);
2292
2293 if (key >= 0)
2294 val = tgt_pkattvals[key] ? pstrdup(tgt_pkattvals[key]) : NULL;
2295 else
2296 val = SPI_getvalue(tuple, tupdesc, i + 1);
2297
2298 if (val != NULL)
2299 {
2301 pfree(val);
2302 }
2303 else
2304 appendStringInfoString(&buf, "NULL");
2305 needComma = true;
2306 }
2307
2308 appendStringInfoString(&buf, " WHERE ");
2309
2310 for (i = 0; i < pknumatts; i++)
2311 {
2312 int pkattnum = pkattnums[i];
2313 Form_pg_attribute attr = TupleDescAttr(tupdesc, pkattnum);
2314
2315 if (i > 0)
2316 appendStringInfoString(&buf, " AND ");
2317
2319 quote_ident_cstr(NameStr(attr->attname)));
2320
2321 val = tgt_pkattvals[i];
2322
2323 if (val != NULL)
2325 else
2326 appendStringInfoString(&buf, " IS NULL");
2327 }
2328
2329 return buf.data;
2330}
2331
2332/*
2333 * Return a properly quoted identifier.
2334 * Uses quote_ident in quote.c
2335 */
2336static char *
2337quote_ident_cstr(char *rawstr)
2338{
2339 text *rawstr_text;
2340 text *result_text;
2341 char *result;
2342
2343 rawstr_text = cstring_to_text(rawstr);
2345 PointerGetDatum(rawstr_text)));
2346 result = text_to_cstring(result_text);
2347
2348 return result;
2349}
2350
2351static int
2352get_attnum_pk_pos(int *pkattnums, int pknumatts, int key)
2353{
2354 int i;
2355
2356 /*
2357 * Not likely a long list anyway, so just scan for the value
2358 */
2359 for (i = 0; i < pknumatts; i++)
2360 if (key == pkattnums[i])
2361 return i;
2362
2363 return -1;
2364}
2365
2366static HeapTuple
2367get_tuple_of_interest(Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals)
2368{
2369 char *relname;
2370 TupleDesc tupdesc;
2371 int natts;
2373 int ret;
2374 HeapTuple tuple;
2375 int i;
2376
2377 /*
2378 * Connect to SPI manager
2379 */
2380 SPI_connect();
2381
2383
2384 /* get relation name including any needed schema prefix and quoting */
2386
2387 tupdesc = rel->rd_att;
2388 natts = tupdesc->natts;
2389
2390 /*
2391 * Build sql statement to look up tuple of interest, ie, the one matching
2392 * src_pkattvals. We used to use "SELECT *" here, but it's simpler to
2393 * generate a result tuple that matches the table's physical structure,
2394 * with NULLs for any dropped columns. Otherwise we have to deal with two
2395 * different tupdescs and everything's very confusing.
2396 */
2397 appendStringInfoString(&buf, "SELECT ");
2398
2399 for (i = 0; i < natts; i++)
2400 {
2401 Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
2402
2403 if (i > 0)
2405
2406 if (attr->attisdropped)
2407 appendStringInfoString(&buf, "NULL");
2408 else
2410 quote_ident_cstr(NameStr(attr->attname)));
2411 }
2412
2413 appendStringInfo(&buf, " FROM %s WHERE ", relname);
2414
2415 for (i = 0; i < pknumatts; i++)
2416 {
2417 int pkattnum = pkattnums[i];
2418 Form_pg_attribute attr = TupleDescAttr(tupdesc, pkattnum);
2419
2420 if (i > 0)
2421 appendStringInfoString(&buf, " AND ");
2422
2424 quote_ident_cstr(NameStr(attr->attname)));
2425
2426 if (src_pkattvals[i] != NULL)
2427 appendStringInfo(&buf, " = %s",
2428 quote_literal_cstr(src_pkattvals[i]));
2429 else
2430 appendStringInfoString(&buf, " IS NULL");
2431 }
2432
2433 /*
2434 * Retrieve the desired tuple
2435 */
2436 ret = SPI_exec(buf.data, 0);
2437 pfree(buf.data);
2438
2439 /*
2440 * Only allow one qualifying tuple
2441 */
2442 if ((ret == SPI_OK_SELECT) && (SPI_processed > 1))
2443 ereport(ERROR,
2444 (errcode(ERRCODE_CARDINALITY_VIOLATION),
2445 errmsg("source criteria matched more than one record")));
2446
2447 else if (ret == SPI_OK_SELECT && SPI_processed == 1)
2448 {
2449 SPITupleTable *tuptable = SPI_tuptable;
2450
2451 tuple = SPI_copytuple(tuptable->vals[0]);
2452 SPI_finish();
2453
2454 return tuple;
2455 }
2456 else
2457 {
2458 /*
2459 * no qualifying tuples
2460 */
2461 SPI_finish();
2462
2463 return NULL;
2464 }
2465
2466 /*
2467 * never reached, but keep compiler quiet
2468 */
2469 return NULL;
2470}
2471
2472/*
2473 * Open the relation named by relname_text, acquire specified type of lock,
2474 * verify we have specified permissions.
2475 * Caller must close rel when done with it.
2476 */
2477static Relation
2478get_rel_from_relname(text *relname_text, LOCKMODE lockmode, AclMode aclmode)
2479{
2480 RangeVar *relvar;
2481 Relation rel;
2482 AclResult aclresult;
2483
2484 relvar = makeRangeVarFromNameList(textToQualifiedNameList(relname_text));
2485 rel = table_openrv(relvar, lockmode);
2486
2487 aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
2488 aclmode);
2489 if (aclresult != ACLCHECK_OK)
2490 aclcheck_error(aclresult, get_relkind_objtype(rel->rd_rel->relkind),
2492
2493 return rel;
2494}
2495
2496/*
2497 * generate_relation_name - copied from ruleutils.c
2498 * Compute the name to display for a relation
2499 *
2500 * The result includes all necessary quoting and schema-prefixing.
2501 */
2502static char *
2504{
2505 char *nspname;
2506 char *result;
2507
2508 /* Qualify the name if not visible in search path */
2510 nspname = NULL;
2511 else
2512 nspname = get_namespace_name(rel->rd_rel->relnamespace);
2513
2515
2516 return result;
2517}
2518
2519
2520static remoteConn *
2522{
2523 remoteConnHashEnt *hentry;
2524 char *key;
2525
2526 if (!remoteConnHash)
2528
2529 key = pstrdup(name);
2530 truncate_identifier(key, strlen(key), false);
2532 key, HASH_FIND, NULL);
2533
2534 if (hentry)
2535 return hentry->rconn;
2536
2537 return NULL;
2538}
2539
2540static HTAB *
2542{
2543 HASHCTL ctl;
2544
2545 ctl.keysize = NAMEDATALEN;
2546 ctl.entrysize = sizeof(remoteConnHashEnt);
2547
2548 return hash_create("Remote Con hash", NUMCONN, &ctl,
2550}
2551
2552static void
2554{
2555 remoteConnHashEnt *hentry;
2556 bool found;
2557 char *key;
2558
2559 if (!remoteConnHash)
2561
2562 key = pstrdup(name);
2563 truncate_identifier(key, strlen(key), true);
2565 HASH_ENTER, &found);
2566
2567 if (found)
2568 {
2569 libpqsrv_disconnect(rconn->conn);
2570 pfree(rconn);
2571
2572 ereport(ERROR,
2574 errmsg("duplicate connection name")));
2575 }
2576
2577 hentry->rconn = rconn;
2578}
2579
2580static void
2582{
2583 remoteConnHashEnt *hentry;
2584 bool found;
2585 char *key;
2586
2587 if (!remoteConnHash)
2589
2590 key = pstrdup(name);
2591 truncate_identifier(key, strlen(key), false);
2593 key, HASH_REMOVE, &found);
2594
2595 if (!hentry)
2596 ereport(ERROR,
2597 (errcode(ERRCODE_UNDEFINED_OBJECT),
2598 errmsg("undefined connection name")));
2599}
2600
2601/*
2602 * We need to make sure that the connection made used credentials
2603 * which were provided by the user, so check what credentials were
2604 * used to connect and then make sure that they came from the user.
2605 */
2606static void
2608{
2609 /* Superuser bypasses security check */
2610 if (superuser())
2611 return;
2612
2613 /* If password was used to connect, make sure it was one provided */
2615 return;
2616
2617#ifdef ENABLE_GSS
2618 /* If GSSAPI creds used to connect, make sure it was one delegated */
2620 return;
2621#endif
2622
2623 /* Otherwise, fail out */
2625 if (rconn)
2626 pfree(rconn);
2627
2628 ereport(ERROR,
2629 (errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED),
2630 errmsg("password or GSSAPI delegated credentials required"),
2631 errdetail("Non-superusers may only connect using credentials they provide, eg: password in connection string or delegated GSSAPI credentials"),
2632 errhint("Ensure provided credentials match target server's authentication method.")));
2633}
2634
2635/*
2636 * Function to check if the connection string includes an explicit
2637 * password, needed to ensure that non-superuser password-based auth
2638 * is using a provided password and not one picked up from the
2639 * environment.
2640 */
2641static bool
2643{
2646 bool connstr_gives_password = false;
2647
2649 if (options)
2650 {
2651 for (option = options; option->keyword != NULL; option++)
2652 {
2653 if (strcmp(option->keyword, "password") == 0)
2654 {
2655 if (option->val != NULL && option->val[0] != '\0')
2656 {
2657 connstr_gives_password = true;
2658 break;
2659 }
2660 }
2661 }
2663 }
2664
2665 return connstr_gives_password;
2666}
2667
2668/*
2669 * For non-superusers, insist that the connstr specify a password, except
2670 * if GSSAPI credentials have been delegated (and we check that they are used
2671 * for the connection in dblink_security_check later). This prevents a
2672 * password or GSSAPI credentials from being picked up from .pgpass, a
2673 * service file, the environment, etc. We don't want the postgres user's
2674 * passwords or Kerberos credentials to be accessible to non-superusers.
2675 */
2676static void
2678{
2679 if (superuser())
2680 return;
2681
2683 return;
2684
2685#ifdef ENABLE_GSS
2687 return;
2688#endif
2689
2690 ereport(ERROR,
2691 (errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED),
2692 errmsg("password or GSSAPI delegated credentials required"),
2693 errdetail("Non-superusers must provide a password in the connection string or send delegated GSSAPI credentials.")));
2694}
2695
2696/*
2697 * Report an error received from the remote server
2698 *
2699 * res: the received error result (will be freed)
2700 * fail: true for ERROR ereport, false for NOTICE
2701 * fmt and following args: sprintf-style format and values for errcontext;
2702 * the resulting string should be worded like "while <some action>"
2703 */
2704static void
2705dblink_res_error(PGconn *conn, const char *conname, PGresult *res,
2706 bool fail, const char *fmt,...)
2707{
2708 int level;
2709 char *pg_diag_sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
2710 char *pg_diag_message_primary = PQresultErrorField(res, PG_DIAG_MESSAGE_PRIMARY);
2711 char *pg_diag_message_detail = PQresultErrorField(res, PG_DIAG_MESSAGE_DETAIL);
2712 char *pg_diag_message_hint = PQresultErrorField(res, PG_DIAG_MESSAGE_HINT);
2713 char *pg_diag_context = PQresultErrorField(res, PG_DIAG_CONTEXT);
2714 int sqlstate;
2715 char *message_primary;
2716 char *message_detail;
2717 char *message_hint;
2718 char *message_context;
2719 va_list ap;
2720 char dblink_context_msg[512];
2721
2722 if (fail)
2723 level = ERROR;
2724 else
2725 level = NOTICE;
2726
2727 if (pg_diag_sqlstate)
2728 sqlstate = MAKE_SQLSTATE(pg_diag_sqlstate[0],
2729 pg_diag_sqlstate[1],
2730 pg_diag_sqlstate[2],
2731 pg_diag_sqlstate[3],
2732 pg_diag_sqlstate[4]);
2733 else
2734 sqlstate = ERRCODE_CONNECTION_FAILURE;
2735
2736 message_primary = xpstrdup(pg_diag_message_primary);
2737 message_detail = xpstrdup(pg_diag_message_detail);
2738 message_hint = xpstrdup(pg_diag_message_hint);
2739 message_context = xpstrdup(pg_diag_context);
2740
2741 /*
2742 * If we don't get a message from the PGresult, try the PGconn. This is
2743 * needed because for connection-level failures, PQgetResult may just
2744 * return NULL, not a PGresult at all.
2745 */
2746 if (message_primary == NULL)
2747 message_primary = pchomp(PQerrorMessage(conn));
2748
2749 /*
2750 * Now that we've copied all the data we need out of the PGresult, it's
2751 * safe to free it. We must do this to avoid PGresult leakage. We're
2752 * leaking all the strings too, but those are in palloc'd memory that will
2753 * get cleaned up eventually.
2754 */
2755 PQclear(res);
2756
2757 /*
2758 * Format the basic errcontext string. Below, we'll add on something
2759 * about the connection name. That's a violation of the translatability
2760 * guidelines about constructing error messages out of parts, but since
2761 * there's no translation support for dblink, there's no need to worry
2762 * about that (yet).
2763 */
2764 va_start(ap, fmt);
2765 vsnprintf(dblink_context_msg, sizeof(dblink_context_msg), fmt, ap);
2766 va_end(ap);
2767
2768 ereport(level,
2769 (errcode(sqlstate),
2770 (message_primary != NULL && message_primary[0] != '\0') ?
2771 errmsg_internal("%s", message_primary) :
2772 errmsg("could not obtain message string for remote error"),
2773 message_detail ? errdetail_internal("%s", message_detail) : 0,
2774 message_hint ? errhint("%s", message_hint) : 0,
2775 message_context ? (errcontext("%s", message_context)) : 0,
2776 conname ?
2777 (errcontext("%s on dblink connection named \"%s\"",
2778 dblink_context_msg, conname)) :
2779 (errcontext("%s on unnamed dblink connection",
2780 dblink_context_msg))));
2781}
2782
2783/*
2784 * Obtain connection string for a foreign server
2785 */
2786static char *
2787get_connect_string(const char *servername)
2788{
2789 ForeignServer *foreign_server = NULL;
2790 UserMapping *user_mapping;
2791 ListCell *cell;
2793 ForeignDataWrapper *fdw;
2794 AclResult aclresult;
2795 char *srvname;
2796
2797 static const PQconninfoOption *options = NULL;
2798
2800
2801 /*
2802 * Get list of valid libpq options.
2803 *
2804 * To avoid unnecessary work, we get the list once and use it throughout
2805 * the lifetime of this backend process. We don't need to care about
2806 * memory context issues, because PQconndefaults allocates with malloc.
2807 */
2808 if (!options)
2809 {
2811 if (!options) /* assume reason for failure is OOM */
2812 ereport(ERROR,
2813 (errcode(ERRCODE_FDW_OUT_OF_MEMORY),
2814 errmsg("out of memory"),
2815 errdetail("Could not get libpq's default connection options.")));
2816 }
2817
2818 /* first gather the server connstr options */
2819 srvname = pstrdup(servername);
2820 truncate_identifier(srvname, strlen(srvname), false);
2821 foreign_server = GetForeignServerByName(srvname, true);
2822
2823 if (foreign_server)
2824 {
2825 Oid serverid = foreign_server->serverid;
2826 Oid fdwid = foreign_server->fdwid;
2827 Oid userid = GetUserId();
2828
2829 user_mapping = GetUserMapping(userid, serverid);
2830 fdw = GetForeignDataWrapper(fdwid);
2831
2832 /* Check permissions, user must have usage on the server. */
2833 aclresult = object_aclcheck(ForeignServerRelationId, serverid, userid, ACL_USAGE);
2834 if (aclresult != ACLCHECK_OK)
2835 aclcheck_error(aclresult, OBJECT_FOREIGN_SERVER, foreign_server->servername);
2836
2837 foreach(cell, fdw->options)
2838 {
2839 DefElem *def = lfirst(cell);
2840
2841 if (is_valid_dblink_option(options, def->defname, ForeignDataWrapperRelationId))
2842 appendStringInfo(&buf, "%s='%s' ", def->defname,
2843 escape_param_str(strVal(def->arg)));
2844 }
2845
2846 foreach(cell, foreign_server->options)
2847 {
2848 DefElem *def = lfirst(cell);
2849
2850 if (is_valid_dblink_option(options, def->defname, ForeignServerRelationId))
2851 appendStringInfo(&buf, "%s='%s' ", def->defname,
2852 escape_param_str(strVal(def->arg)));
2853 }
2854
2855 foreach(cell, user_mapping->options)
2856 {
2857
2858 DefElem *def = lfirst(cell);
2859
2860 if (is_valid_dblink_option(options, def->defname, UserMappingRelationId))
2861 appendStringInfo(&buf, "%s='%s' ", def->defname,
2862 escape_param_str(strVal(def->arg)));
2863 }
2864
2865 return buf.data;
2866 }
2867 else
2868 return NULL;
2869}
2870
2871/*
2872 * Escaping libpq connect parameter strings.
2873 *
2874 * Replaces "'" with "\'" and "\" with "\\".
2875 */
2876static char *
2878{
2879 const char *cp;
2881
2883
2884 for (cp = str; *cp; cp++)
2885 {
2886 if (*cp == '\\' || *cp == '\'')
2887 appendStringInfoChar(&buf, '\\');
2889 }
2890
2891 return buf.data;
2892}
2893
2894/*
2895 * Validate the PK-attnums argument for dblink_build_sql_insert() and related
2896 * functions, and translate to the internal representation.
2897 *
2898 * The user supplies an int2vector of 1-based logical attnums, plus a count
2899 * argument (the need for the separate count argument is historical, but we
2900 * still check it). We check that each attnum corresponds to a valid,
2901 * non-dropped attribute of the rel. We do *not* prevent attnums from being
2902 * listed twice, though the actual use-case for such things is dubious.
2903 * Note that before Postgres 9.0, the user's attnums were interpreted as
2904 * physical not logical column numbers; this was changed for future-proofing.
2905 *
2906 * The internal representation is a palloc'd int array of 0-based physical
2907 * attnums.
2908 */
2909static void
2911 int2vector *pkattnums_arg, int32 pknumatts_arg,
2912 int **pkattnums, int *pknumatts)
2913{
2914 TupleDesc tupdesc = rel->rd_att;
2915 int natts = tupdesc->natts;
2916 int i;
2917
2918 /* Don't take more array elements than there are */
2919 pknumatts_arg = Min(pknumatts_arg, pkattnums_arg->dim1);
2920
2921 /* Must have at least one pk attnum selected */
2922 if (pknumatts_arg <= 0)
2923 ereport(ERROR,
2924 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2925 errmsg("number of key attributes must be > 0")));
2926
2927 /* Allocate output array */
2928 *pkattnums = palloc_array(int, pknumatts_arg);
2929 *pknumatts = pknumatts_arg;
2930
2931 /* Validate attnums and convert to internal form */
2932 for (i = 0; i < pknumatts_arg; i++)
2933 {
2934 int pkattnum = pkattnums_arg->values[i];
2935 int lnum;
2936 int j;
2937
2938 /* Can throw error immediately if out of range */
2939 if (pkattnum <= 0 || pkattnum > natts)
2940 ereport(ERROR,
2941 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2942 errmsg("invalid attribute number %d", pkattnum)));
2943
2944 /* Identify which physical column has this logical number */
2945 lnum = 0;
2946 for (j = 0; j < natts; j++)
2947 {
2948 /* dropped columns don't count */
2949 if (TupleDescAttr(tupdesc, j)->attisdropped)
2950 continue;
2951
2952 if (++lnum == pkattnum)
2953 break;
2954 }
2955
2956 if (j < natts)
2957 (*pkattnums)[i] = j;
2958 else
2959 ereport(ERROR,
2960 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2961 errmsg("invalid attribute number %d", pkattnum)));
2962 }
2963}
2964
2965/*
2966 * Check if the specified connection option is valid.
2967 *
2968 * We basically allow whatever libpq thinks is an option, with these
2969 * restrictions:
2970 * debug options: disallowed
2971 * "client_encoding": disallowed
2972 * "user": valid only in USER MAPPING options
2973 * secure options (eg password): valid only in USER MAPPING options
2974 * others: valid only in FOREIGN SERVER options
2975 *
2976 * We disallow client_encoding because it would be overridden anyway via
2977 * PQclientEncoding; allowing it to be specified would merely promote
2978 * confusion.
2979 */
2980static bool
2982 Oid context)
2983{
2984 const PQconninfoOption *opt;
2985
2986 /* Look up the option in libpq result */
2987 for (opt = options; opt->keyword; opt++)
2988 {
2989 if (strcmp(opt->keyword, option) == 0)
2990 break;
2991 }
2992 if (opt->keyword == NULL)
2993 return false;
2994
2995 /* Disallow debug options (particularly "replication") */
2996 if (strchr(opt->dispchar, 'D'))
2997 return false;
2998
2999 /* Disallow "client_encoding" */
3000 if (strcmp(opt->keyword, "client_encoding") == 0)
3001 return false;
3002
3003 /*
3004 * If the option is "user" or marked secure, it should be specified only
3005 * in USER MAPPING. Others should be specified only in SERVER.
3006 */
3007 if (strcmp(opt->keyword, "user") == 0 || strchr(opt->dispchar, '*'))
3008 {
3009 if (context != UserMappingRelationId)
3010 return false;
3011 }
3012 else
3013 {
3014 if (context != ForeignServerRelationId)
3015 return false;
3016 }
3017
3018 return true;
3019}
3020
3021/*
3022 * Copy the remote session's values of GUCs that affect datatype I/O
3023 * and apply them locally in a new GUC nesting level. Returns the new
3024 * nestlevel (which is needed by restoreLocalGucs to undo the settings),
3025 * or -1 if no new nestlevel was needed.
3026 *
3027 * We use the equivalent of a function SET option to allow the settings to
3028 * persist only until the caller calls restoreLocalGucs. If an error is
3029 * thrown in between, guc.c will take care of undoing the settings.
3030 */
3031static int
3033{
3034 static const char *const GUCsAffectingIO[] = {
3035 "DateStyle",
3036 "IntervalStyle"
3037 };
3038
3039 int nestlevel = -1;
3040 int i;
3041
3042 for (i = 0; i < lengthof(GUCsAffectingIO); i++)
3043 {
3044 const char *gucName = GUCsAffectingIO[i];
3045 const char *remoteVal = PQparameterStatus(conn, gucName);
3046 const char *localVal;
3047
3048 /*
3049 * If the remote server is pre-8.4, it won't have IntervalStyle, but
3050 * that's okay because its output format won't be ambiguous. So just
3051 * skip the GUC if we don't get a value for it. (We might eventually
3052 * need more complicated logic with remote-version checks here.)
3053 */
3054 if (remoteVal == NULL)
3055 continue;
3056
3057 /*
3058 * Avoid GUC-setting overhead if the remote and local GUCs already
3059 * have the same value.
3060 */
3061 localVal = GetConfigOption(gucName, false, false);
3062 Assert(localVal != NULL);
3063
3064 if (strcmp(remoteVal, localVal) == 0)
3065 continue;
3066
3067 /* Create new GUC nest level if we didn't already */
3068 if (nestlevel < 0)
3069 nestlevel = NewGUCNestLevel();
3070
3071 /* Apply the option (this will throw error on failure) */
3072 (void) set_config_option(gucName, remoteVal,
3074 GUC_ACTION_SAVE, true, 0, false);
3075 }
3076
3077 return nestlevel;
3078}
3079
3080/*
3081 * Restore local GUCs after they have been overlaid with remote settings.
3082 */
3083static void
3084restoreLocalGucs(int nestlevel)
3085{
3086 /* Do nothing if no new nestlevel was created */
3087 if (nestlevel > 0)
3088 AtEOXact_GUC(true, nestlevel);
3089}
AclResult
Definition: acl.h:182
@ ACLCHECK_OK
Definition: acl.h:183
void aclcheck_error(AclResult aclerr, ObjectType objtype, const char *objectname)
Definition: aclchk.c:2622
AclResult object_aclcheck(Oid classid, Oid objectid, Oid roleid, AclMode mode)
Definition: aclchk.c:3810
AclResult pg_class_aclcheck(Oid table_oid, Oid roleid, AclMode mode)
Definition: aclchk.c:4013
#define ARR_NDIM(a)
Definition: array.h:290
#define PG_GETARG_ARRAYTYPE_P(n)
Definition: array.h:263
#define ARR_DATA_PTR(a)
Definition: array.h:322
#define ARR_NULLBITMAP(a)
Definition: array.h:300
#define ARR_ELEMTYPE(a)
Definition: array.h:292
#define ARR_DIMS(a)
Definition: array.h:294
ArrayBuildState * accumArrayResult(ArrayBuildState *astate, Datum dvalue, bool disnull, Oid element_type, MemoryContext rcontext)
Definition: arrayfuncs.c:5350
Datum makeArrayResult(ArrayBuildState *astate, MemoryContext rcontext)
Definition: arrayfuncs.c:5420
int ArrayGetNItems(int ndim, const int *dims)
Definition: arrayutils.c:57
int16 AttrNumber
Definition: attnum.h:21
Datum current_query(PG_FUNCTION_ARGS)
Definition: misc.c:212
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1644
bool be_gssapi_get_delegation(Port *port)
static Datum values[MAXATTR]
Definition: bootstrap.c:151
#define CStringGetTextDatum(s)
Definition: builtins.h:97
#define TextDatumGetCString(d)
Definition: builtins.h:98
#define NameStr(name)
Definition: c.h:700
#define Min(x, y)
Definition: c.h:958
#define Assert(condition)
Definition: c.h:812
#define pg_attribute_printf(f, a)
Definition: c.h:210
int16_t int16
Definition: c.h:480
uint8 bits8
Definition: c.h:492
int32_t int32
Definition: c.h:481
uint32_t uint32
Definition: c.h:485
#define lengthof(array)
Definition: c.h:742
int64 TimestampTz
Definition: timestamp.h:39
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:955
void * hash_seq_search(HASH_SEQ_STATUS *status)
Definition: dynahash.c:1420
HTAB * hash_create(const char *tabname, long nelem, const HASHCTL *info, int flags)
Definition: dynahash.c:352
void hash_seq_init(HASH_SEQ_STATUS *status, HTAB *hashp)
Definition: dynahash.c:1385
int errmsg_internal(const char *fmt,...)
Definition: elog.c:1157
int errdetail_internal(const char *fmt,...)
Definition: elog.c:1230
int errdetail(const char *fmt,...)
Definition: elog.c:1203
int errhint(const char *fmt,...)
Definition: elog.c:1317
int errcode(int sqlerrcode)
Definition: elog.c:853
int errmsg(const char *fmt,...)
Definition: elog.c:1070
#define PG_RE_THROW()
Definition: elog.h:412
#define errcontext
Definition: elog.h:196
#define PG_TRY(...)
Definition: elog.h:371
#define PG_END_TRY(...)
Definition: elog.h:396
#define ERROR
Definition: elog.h:39
#define PG_CATCH(...)
Definition: elog.h:381
#define MAKE_SQLSTATE(ch1, ch2, ch3, ch4, ch5)
Definition: elog.h:56
#define NOTICE
Definition: elog.h:35
#define PG_FINALLY(...)
Definition: elog.h:388
#define ereport(elevel,...)
Definition: elog.h:149
HeapTuple BuildTupleFromCStrings(AttInMetadata *attinmeta, char **values)
Definition: execTuples.c:2322
AttInMetadata * TupleDescGetAttInMetadata(TupleDesc tupdesc)
Definition: execTuples.c:2273
@ SFRM_Materialize
Definition: execnodes.h:320
PGTransactionStatusType PQtransactionStatus(const PGconn *conn)
Definition: fe-connect.c:7154
int PQconnectionUsedPassword(const PGconn *conn)
Definition: fe-connect.c:7275
void PQconninfoFree(PQconninfoOption *connOptions)
Definition: fe-connect.c:7024
PQconninfoOption * PQconninfoParse(const char *conninfo, char **errmsg)
Definition: fe-connect.c:5740
const char * PQparameterStatus(const PGconn *conn, const char *paramName)
Definition: fe-connect.c:7164
int PQconnectionUsedGSSAPI(const PGconn *conn)
Definition: fe-connect.c:7286
ConnStatusType PQstatus(const PGconn *conn)
Definition: fe-connect.c:7146
int PQclientEncoding(const PGconn *conn)
Definition: fe-connect.c:7297
PQconninfoOption * PQconndefaults(void)
Definition: fe-connect.c:1883
char * PQerrorMessage(const PGconn *conn)
Definition: fe-connect.c:7209
int PQsetClientEncoding(PGconn *conn, const char *encoding)
Definition: fe-connect.c:7305
int PQsetSingleRowMode(PGconn *conn)
Definition: fe-exec.c:1948
void PQfreemem(void *ptr)
Definition: fe-exec.c:4032
char * PQgetvalue(const PGresult *res, int tup_num, int field_num)
Definition: fe-exec.c:3876
ExecStatusType PQresultStatus(const PGresult *res)
Definition: fe-exec.c:3411
int PQntuples(const PGresult *res)
Definition: fe-exec.c:3481
int PQconsumeInput(PGconn *conn)
Definition: fe-exec.c:1984
int PQgetisnull(const PGresult *res, int tup_num, int field_num)
Definition: fe-exec.c:3901
char * PQresultErrorField(const PGresult *res, int fieldcode)
Definition: fe-exec.c:3466
int PQsendQuery(PGconn *conn, const char *query)
Definition: fe-exec.c:1416
char * PQcmdStatus(PGresult *res)
Definition: fe-exec.c:3752
int PQisBusy(PGconn *conn)
Definition: fe-exec.c:2031
int PQnfields(const PGresult *res)
Definition: fe-exec.c:3489
PGnotify * PQnotifies(PGconn *conn)
Definition: fe-exec.c:2667
#define palloc_array(type, count)
Definition: fe_memutils.h:76
Oid get_fn_expr_argtype(FmgrInfo *flinfo, int argnum)
Definition: fmgr.c:1910
#define PG_RETURN_VOID()
Definition: fmgr.h:349
#define PG_GETARG_OID(n)
Definition: fmgr.h:275
#define PG_GETARG_TEXT_PP(n)
Definition: fmgr.h:309
#define DatumGetTextPP(X)
Definition: fmgr.h:292
#define PG_GETARG_POINTER(n)
Definition: fmgr.h:276
#define DirectFunctionCall1(func, arg1)
Definition: fmgr.h:641
#define PG_GETARG_DATUM(n)
Definition: fmgr.h:268
#define PG_NARGS()
Definition: fmgr.h:203
#define PG_RETURN_NULL()
Definition: fmgr.h:345
#define PG_RETURN_TEXT_P(x)
Definition: fmgr.h:372
#define PG_RETURN_INT32(x)
Definition: fmgr.h:354
#define PG_GETARG_INT32(n)
Definition: fmgr.h:269
#define PG_GETARG_BOOL(n)
Definition: fmgr.h:274
#define PG_RETURN_DATUM(x)
Definition: fmgr.h:353
#define PG_FUNCTION_ARGS
Definition: fmgr.h:193
ForeignDataWrapper * GetForeignDataWrapper(Oid fdwid)
Definition: foreign.c:37
ForeignServer * GetForeignServerByName(const char *srvname, bool missing_ok)
Definition: foreign.c:182
UserMapping * GetUserMapping(Oid userid, Oid serverid)
Definition: foreign.c:200
void InitMaterializedSRF(FunctionCallInfo fcinfo, bits32 flags)
Definition: funcapi.c:76
TypeFuncClass get_call_result_type(FunctionCallInfo fcinfo, Oid *resultTypeId, TupleDesc *resultTupleDesc)
Definition: funcapi.c:276
#define SRF_IS_FIRSTCALL()
Definition: funcapi.h:304
#define SRF_PERCALL_SETUP()
Definition: funcapi.h:308
@ TYPEFUNC_COMPOSITE
Definition: funcapi.h:149
@ TYPEFUNC_RECORD
Definition: funcapi.h:151
#define SRF_RETURN_NEXT(_funcctx, _result)
Definition: funcapi.h:310
#define SRF_FIRSTCALL_INIT()
Definition: funcapi.h:306
static Datum HeapTupleGetDatum(const HeapTupleData *tuple)
Definition: funcapi.h:230
#define SRF_RETURN_DONE(_funcctx)
Definition: funcapi.h:328
void systable_endscan(SysScanDesc sysscan)
Definition: genam.c:606
HeapTuple systable_getnext(SysScanDesc sysscan)
Definition: genam.c:513
SysScanDesc systable_beginscan(Relation heapRelation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, ScanKey key)
Definition: genam.c:387
struct Port * MyProcPort
Definition: globals.c:50
int work_mem
Definition: globals.c:130
int NewGUCNestLevel(void)
Definition: guc.c:2235
const char * GetConfigOption(const char *name, bool missing_ok, bool restrict_privileged)
Definition: guc.c:4355
void AtEOXact_GUC(bool isCommit, int nestLevel)
Definition: guc.c:2262
int set_config_option(const char *name, const char *value, GucContext context, GucSource source, GucAction action, bool changeVal, int elevel, bool is_reload)
Definition: guc.c:3342
@ GUC_ACTION_SAVE
Definition: guc.h:201
@ PGC_S_SESSION
Definition: guc.h:122
@ PGC_USERSET
Definition: guc.h:75
const char * str
#define HASH_STRINGS
Definition: hsearch.h:96
@ HASH_FIND
Definition: hsearch.h:113
@ HASH_REMOVE
Definition: hsearch.h:115
@ HASH_ENTER
Definition: hsearch.h:114
#define HASH_ELEM
Definition: hsearch.h:95
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define GETSTRUCT(TUP)
Definition: htup_details.h:653
#define nitems(x)
Definition: indent.h:31
struct parser_state match_state[5]
long val
Definition: informix.c:689
int j
Definition: isn.c:73
int i
Definition: isn.c:72
if(TABLE==NULL||TABLE_index==NULL)
Definition: isn.c:76
static const char * libpqsrv_cancel(PGconn *conn, TimestampTz endtime)
static PGresult * libpqsrv_exec(PGconn *conn, const char *query, uint32 wait_event_info)
static PGconn * libpqsrv_connect(const char *conninfo, uint32 wait_event_info)
static PGresult * libpqsrv_get_result(PGconn *conn, uint32 wait_event_info)
static void libpqsrv_disconnect(PGconn *conn)
@ CONNECTION_BAD
Definition: libpq-fe.h:82
@ PGRES_COMMAND_OK
Definition: libpq-fe.h:120
@ PGRES_SINGLE_TUPLE
Definition: libpq-fe.h:133
@ PGRES_TUPLES_OK
Definition: libpq-fe.h:123
@ PQTRANS_IDLE
Definition: libpq-fe.h:142
static void const char * fmt
va_end(args)
va_start(args, fmt)
int LOCKMODE
Definition: lockdefs.h:26
#define AccessShareLock
Definition: lockdefs.h:36
void get_typlenbyvalalign(Oid typid, int16 *typlen, bool *typbyval, char *typalign)
Definition: lsyscache.c:2271
char * get_namespace_name(Oid nspid)
Definition: lsyscache.c:3366
int GetDatabaseEncoding(void)
Definition: mbutils.c:1261
const char * GetDatabaseEncodingName(void)
Definition: mbutils.c:1267
void * MemoryContextAlloc(MemoryContext context, Size size)
Definition: mcxt.c:1181
void MemoryContextReset(MemoryContext context)
Definition: mcxt.c:383
char * pstrdup(const char *in)
Definition: mcxt.c:1696
void pfree(void *pointer)
Definition: mcxt.c:1521
MemoryContext TopMemoryContext
Definition: mcxt.c:149
char * pchomp(const char *in)
Definition: mcxt.c:1724
MemoryContext CurrentMemoryContext
Definition: mcxt.c:143
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:454
#define AllocSetContextCreate
Definition: memutils.h:129
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:160
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:122
Oid GetUserId(void)
Definition: miscinit.c:517
bool RelationIsVisible(Oid relid)
Definition: namespace.c:913
RangeVar * makeRangeVarFromNameList(const List *names)
Definition: namespace.c:3554
#define IsA(nodeptr, _type_)
Definition: nodes.h:158
ObjectType get_relkind_objtype(char relkind)
uint64 AclMode
Definition: parsenodes.h:74
#define ACL_USAGE
Definition: parsenodes.h:84
@ OBJECT_FOREIGN_SERVER
Definition: parsenodes.h:2285
#define ACL_SELECT
Definition: parsenodes.h:77
FormData_pg_attribute * Form_pg_attribute
Definition: pg_attribute.h:200
NameData relname
Definition: pg_class.h:38
#define NAMEDATALEN
static char * connstr
Definition: pg_dumpall.c:88
FormData_pg_index * Form_pg_index
Definition: pg_index.h:70
#define lfirst(lc)
Definition: pg_list.h:172
static char ** options
static char * buf
Definition: pg_test_fsync.c:72
char typalign
Definition: pg_type.h:176
#define vsnprintf
Definition: port.h:237
static Datum PointerGetDatum(const void *X)
Definition: postgres.h:322
uintptr_t Datum
Definition: postgres.h:64
static Datum ObjectIdGetDatum(Oid X)
Definition: postgres.h:252
static Datum Int32GetDatum(int32 X)
Definition: postgres.h:212
unsigned int Oid
Definition: postgres_ext.h:31
#define PG_DIAG_MESSAGE_HINT
Definition: postgres_ext.h:59
#define PG_DIAG_SQLSTATE
Definition: postgres_ext.h:56
#define PG_DIAG_MESSAGE_PRIMARY
Definition: postgres_ext.h:57
#define PG_DIAG_MESSAGE_DETAIL
Definition: postgres_ext.h:58
#define PG_DIAG_CONTEXT
Definition: postgres_ext.h:63
char * psprintf(const char *fmt,...)
Definition: psprintf.c:43
char * quote_literal_cstr(const char *rawstr)
Definition: quote.c:103
Datum quote_ident(PG_FUNCTION_ARGS)
Definition: quote.c:25
tree context
Definition: radixtree.h:1837
MemoryContextSwitchTo(old_ctx)
tree ctl
Definition: radixtree.h:1855
#define RelationGetRelid(relation)
Definition: rel.h:505
#define RelationGetRelationName(relation)
Definition: rel.h:539
List * untransformRelOptions(Datum options)
Definition: reloptions.c:1331
char * quote_qualified_identifier(const char *qualifier, const char *ident)
Definition: ruleutils.c:12954
void ScanKeyInit(ScanKey entry, AttrNumber attributeNumber, StrategyNumber strategy, RegProcedure procedure, Datum argument)
Definition: scankey.c:76
void truncate_identifier(char *ident, int len, bool warn)
Definition: scansup.c:93
uint64 SPI_processed
Definition: spi.c:44
SPITupleTable * SPI_tuptable
Definition: spi.c:45
int SPI_connect(void)
Definition: spi.c:94
int SPI_finish(void)
Definition: spi.c:182
int SPI_exec(const char *src, long tcount)
Definition: spi.c:630
char * SPI_getvalue(HeapTuple tuple, TupleDesc tupdesc, int fnumber)
Definition: spi.c:1220
HeapTuple SPI_copytuple(HeapTuple tuple)
Definition: spi.c:1047
char * SPI_fname(TupleDesc tupdesc, int fnumber)
Definition: spi.c:1198
#define SPI_OK_SELECT
Definition: spi.h:86
void relation_close(Relation relation, LOCKMODE lockmode)
Definition: relation.c:205
#define BTEqualStrategyNumber
Definition: stratnum.h:31
#define ERRCODE_DUPLICATE_OBJECT
Definition: streamutil.c:30
PGconn * conn
Definition: streamutil.c:53
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:94
void appendStringInfoString(StringInfo str, const char *s)
Definition: stringinfo.c:179
void appendStringInfoChar(StringInfo str, char ch)
Definition: stringinfo.c:191
void initStringInfo(StringInfo str)
Definition: stringinfo.c:56
char * defname
Definition: parsenodes.h:817
Node * arg
Definition: parsenodes.h:818
MemoryContext ecxt_per_query_memory
Definition: execnodes.h:265
List * options
Definition: foreign.h:31
List * options
Definition: foreign.h:42
char * servername
Definition: foreign.h:39
Oid serverid
Definition: foreign.h:36
void * user_fctx
Definition: funcapi.h:82
uint64 max_calls
Definition: funcapi.h:74
uint64 call_cntr
Definition: funcapi.h:65
AttInMetadata * attinmeta
Definition: funcapi.h:91
MemoryContext multi_call_memory_ctx
Definition: funcapi.h:101
fmNodePtr resultinfo
Definition: fmgr.h:89
FmgrInfo * flinfo
Definition: fmgr.h:87
Definition: dynahash.c:220
Definition: pg_list.h:54
TupleDesc rd_att
Definition: rel.h:112
Form_pg_class rd_rel
Definition: rel.h:111
SetFunctionReturnMode returnMode
Definition: execnodes.h:339
ExprContext * econtext
Definition: execnodes.h:335
TupleDesc setDesc
Definition: execnodes.h:343
Tuplestorestate * setResult
Definition: execnodes.h:342
int allowedModes
Definition: execnodes.h:337
HeapTuple * vals
Definition: spi.h:26
List * options
Definition: foreign.h:50
Definition: type.h:96
Definition: c.h:669
int dim1
Definition: c.h:674
int16 values[FLEXIBLE_ARRAY_MEMBER]
Definition: c.h:676
int val
Definition: getopt_long.h:21
int be_pid
Definition: libpq-fe.h:219
char * relname
Definition: libpq-fe.h:218
char * extra
Definition: libpq-fe.h:220
char name[NAMEDATALEN]
Definition: dblink.c:148
remoteConn * rconn
Definition: dblink.c:149
bool newXactForCursor
Definition: dblink.c:72
int openCursorCount
Definition: dblink.c:71
PGconn * conn
Definition: dblink.c:70
char ** cstrs
Definition: dblink.c:81
MemoryContext tmpcontext
Definition: dblink.c:80
PGresult * cur_res
Definition: dblink.c:84
Tuplestorestate * tuplestore
Definition: dblink.c:78
FunctionCallInfo fcinfo
Definition: dblink.c:77
PGresult * last_res
Definition: dblink.c:83
AttInMetadata * attinmeta
Definition: dblink.c:79
Definition: c.h:641
bool superuser(void)
Definition: superuser.c:46
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:126
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:40
Relation table_openrv(const RangeVar *relation, LOCKMODE lockmode)
Definition: table.c:83
TupleDesc CreateTemplateTupleDesc(int natts)
Definition: tupdesc.c:165
TupleDesc CreateTupleDescCopy(TupleDesc tupdesc)
Definition: tupdesc.c:235
void TupleDescInitEntry(TupleDesc desc, AttrNumber attributeNumber, const char *attributeName, Oid oidtypeid, int32 typmod, int attdim)
Definition: tupdesc.c:797
static FormData_pg_attribute * TupleDescAttr(TupleDesc tupdesc, int i)
Definition: tupdesc.h:152
Tuplestorestate * tuplestore_begin_heap(bool randomAccess, bool interXact, int maxKBytes)
Definition: tuplestore.c:330
void tuplestore_putvalues(Tuplestorestate *state, TupleDesc tdesc, const Datum *values, const bool *isnull)
Definition: tuplestore.c:784
void tuplestore_end(Tuplestorestate *state)
Definition: tuplestore.c:492
void tuplestore_puttuple(Tuplestorestate *state, HeapTuple tuple)
Definition: tuplestore.c:764
#define att_align_nominal(cur_offset, attalign)
Definition: tupmacs.h:150
#define att_addlength_pointer(cur_offset, attlen, attptr)
Definition: tupmacs.h:185
#define TimestampTzPlusMilliseconds(tz, ms)
Definition: timestamp.h:85
#define strVal(v)
Definition: value.h:82
const char * getClosestMatch(ClosestMatchState *state)
Definition: varlena.c:6256
text * cstring_to_text(const char *s)
Definition: varlena.c:184
void initClosestMatch(ClosestMatchState *state, const char *source, int max_d)
Definition: varlena.c:6201
void updateClosestMatch(ClosestMatchState *state, const char *candidate)
Definition: varlena.c:6221
char * text_to_cstring(const text *t)
Definition: varlena.c:217
List * textToQualifiedNameList(text *textval)
Definition: varlena.c:3374
uint32 WaitEventExtensionNew(const char *wait_event_name)
Definition: wait_event.c:163
const char * name