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fe-protocol3.c
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1 /*-------------------------------------------------------------------------
2  *
3  * fe-protocol3.c
4  * functions that are specific to frontend/backend protocol version 3
5  *
6  * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  * src/interfaces/libpq/fe-protocol3.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 #include "postgres_fe.h"
16 
17 #include <ctype.h>
18 #include <fcntl.h>
19 
20 #ifdef WIN32
21 #include "win32.h"
22 #else
23 #include <unistd.h>
24 #ifdef HAVE_NETINET_TCP_H
25 #include <netinet/tcp.h>
26 #endif
27 #endif
28 
29 #include "libpq-fe.h"
30 #include "libpq-int.h"
31 #include "mb/pg_wchar.h"
32 #include "port/pg_bswap.h"
33 
34 /*
35  * This macro lists the backend message types that could be "long" (more
36  * than a couple of kilobytes).
37  */
38 #define VALID_LONG_MESSAGE_TYPE(id) \
39  ((id) == 'T' || (id) == 'D' || (id) == 'd' || (id) == 'V' || \
40  (id) == 'E' || (id) == 'N' || (id) == 'A')
41 
42 
43 static void handleSyncLoss(PGconn *conn, char id, int msgLength);
44 static int getRowDescriptions(PGconn *conn, int msgLength);
45 static int getParamDescriptions(PGconn *conn, int msgLength);
46 static int getAnotherTuple(PGconn *conn, int msgLength);
47 static int getParameterStatus(PGconn *conn);
48 static int getNotify(PGconn *conn);
49 static int getCopyStart(PGconn *conn, ExecStatusType copytype);
50 static int getReadyForQuery(PGconn *conn);
51 static void reportErrorPosition(PQExpBuffer msg, const char *query,
52  int loc, int encoding);
53 static int build_startup_packet(const PGconn *conn, char *packet,
55 
56 
57 /*
58  * parseInput: if appropriate, parse input data from backend
59  * until input is exhausted or a stopping state is reached.
60  * Note that this function will NOT attempt to read more data from the backend.
61  */
62 void
64 {
65  char id;
66  int msgLength;
67  int avail;
68 
69  /*
70  * Loop to parse successive complete messages available in the buffer.
71  */
72  for (;;)
73  {
74  /*
75  * Try to read a message. First get the type code and length. Return
76  * if not enough data.
77  */
78  conn->inCursor = conn->inStart;
79  if (pqGetc(&id, conn))
80  return;
81  if (pqGetInt(&msgLength, 4, conn))
82  return;
83 
84  /*
85  * Try to validate message type/length here. A length less than 4 is
86  * definitely broken. Large lengths should only be believed for a few
87  * message types.
88  */
89  if (msgLength < 4)
90  {
91  handleSyncLoss(conn, id, msgLength);
92  return;
93  }
94  if (msgLength > 30000 && !VALID_LONG_MESSAGE_TYPE(id))
95  {
96  handleSyncLoss(conn, id, msgLength);
97  return;
98  }
99 
100  /*
101  * Can't process if message body isn't all here yet.
102  */
103  msgLength -= 4;
104  avail = conn->inEnd - conn->inCursor;
105  if (avail < msgLength)
106  {
107  /*
108  * Before returning, enlarge the input buffer if needed to hold
109  * the whole message. This is better than leaving it to
110  * pqReadData because we can avoid multiple cycles of realloc()
111  * when the message is large; also, we can implement a reasonable
112  * recovery strategy if we are unable to make the buffer big
113  * enough.
114  */
115  if (pqCheckInBufferSpace(conn->inCursor + (size_t) msgLength,
116  conn))
117  {
118  /*
119  * XXX add some better recovery code... plan is to skip over
120  * the message using its length, then report an error. For the
121  * moment, just treat this like loss of sync (which indeed it
122  * might be!)
123  */
124  handleSyncLoss(conn, id, msgLength);
125  }
126  return;
127  }
128 
129  /*
130  * NOTIFY and NOTICE messages can happen in any state; always process
131  * them right away.
132  *
133  * Most other messages should only be processed while in BUSY state.
134  * (In particular, in READY state we hold off further parsing until
135  * the application collects the current PGresult.)
136  *
137  * However, if the state is IDLE then we got trouble; we need to deal
138  * with the unexpected message somehow.
139  *
140  * ParameterStatus ('S') messages are a special case: in IDLE state we
141  * must process 'em (this case could happen if a new value was adopted
142  * from config file due to SIGHUP), but otherwise we hold off until
143  * BUSY state.
144  */
145  if (id == 'A')
146  {
147  if (getNotify(conn))
148  return;
149  }
150  else if (id == 'N')
151  {
152  if (pqGetErrorNotice3(conn, false))
153  return;
154  }
155  else if (conn->asyncStatus != PGASYNC_BUSY)
156  {
157  /* If not IDLE state, just wait ... */
158  if (conn->asyncStatus != PGASYNC_IDLE)
159  return;
160 
161  /*
162  * Unexpected message in IDLE state; need to recover somehow.
163  * ERROR messages are handled using the notice processor;
164  * ParameterStatus is handled normally; anything else is just
165  * dropped on the floor after displaying a suitable warning
166  * notice. (An ERROR is very possibly the backend telling us why
167  * it is about to close the connection, so we don't want to just
168  * discard it...)
169  */
170  if (id == 'E')
171  {
172  if (pqGetErrorNotice3(conn, false /* treat as notice */ ))
173  return;
174  }
175  else if (id == 'S')
176  {
177  if (getParameterStatus(conn))
178  return;
179  }
180  else
181  {
183  "message type 0x%02x arrived from server while idle",
184  id);
185  /* Discard the unexpected message */
186  conn->inCursor += msgLength;
187  }
188  }
189  else
190  {
191  /*
192  * In BUSY state, we can process everything.
193  */
194  switch (id)
195  {
196  case 'C': /* command complete */
197  if (pqGets(&conn->workBuffer, conn))
198  return;
199  if (conn->result == NULL)
200  {
201  conn->result = PQmakeEmptyPGresult(conn,
203  if (!conn->result)
204  {
206  libpq_gettext("out of memory"));
207  pqSaveErrorResult(conn);
208  }
209  }
210  if (conn->result)
211  strlcpy(conn->result->cmdStatus, conn->workBuffer.data,
212  CMDSTATUS_LEN);
213  conn->asyncStatus = PGASYNC_READY;
214  break;
215  case 'E': /* error return */
216  if (pqGetErrorNotice3(conn, true))
217  return;
218  conn->asyncStatus = PGASYNC_READY;
219  break;
220  case 'Z': /* backend is ready for new query */
221  if (getReadyForQuery(conn))
222  return;
223  conn->asyncStatus = PGASYNC_IDLE;
224  break;
225  case 'I': /* empty query */
226  if (conn->result == NULL)
227  {
228  conn->result = PQmakeEmptyPGresult(conn,
230  if (!conn->result)
231  {
233  libpq_gettext("out of memory"));
234  pqSaveErrorResult(conn);
235  }
236  }
237  conn->asyncStatus = PGASYNC_READY;
238  break;
239  case '1': /* Parse Complete */
240  /* If we're doing PQprepare, we're done; else ignore */
241  if (conn->queryclass == PGQUERY_PREPARE)
242  {
243  if (conn->result == NULL)
244  {
245  conn->result = PQmakeEmptyPGresult(conn,
247  if (!conn->result)
248  {
250  libpq_gettext("out of memory"));
251  pqSaveErrorResult(conn);
252  }
253  }
254  conn->asyncStatus = PGASYNC_READY;
255  }
256  break;
257  case '2': /* Bind Complete */
258  case '3': /* Close Complete */
259  /* Nothing to do for these message types */
260  break;
261  case 'S': /* parameter status */
262  if (getParameterStatus(conn))
263  return;
264  break;
265  case 'K': /* secret key data from the backend */
266 
267  /*
268  * This is expected only during backend startup, but it's
269  * just as easy to handle it as part of the main loop.
270  * Save the data and continue processing.
271  */
272  if (pqGetInt(&(conn->be_pid), 4, conn))
273  return;
274  if (pqGetInt(&(conn->be_key), 4, conn))
275  return;
276  break;
277  case 'T': /* Row Description */
278  if (conn->result != NULL &&
280  {
281  /*
282  * We've already choked for some reason. Just discard
283  * the data till we get to the end of the query.
284  */
285  conn->inCursor += msgLength;
286  }
287  else if (conn->result == NULL ||
288  conn->queryclass == PGQUERY_DESCRIBE)
289  {
290  /* First 'T' in a query sequence */
291  if (getRowDescriptions(conn, msgLength))
292  return;
293  /* getRowDescriptions() moves inStart itself */
294  continue;
295  }
296  else
297  {
298  /*
299  * A new 'T' message is treated as the start of
300  * another PGresult. (It is not clear that this is
301  * really possible with the current backend.) We stop
302  * parsing until the application accepts the current
303  * result.
304  */
305  conn->asyncStatus = PGASYNC_READY;
306  return;
307  }
308  break;
309  case 'n': /* No Data */
310 
311  /*
312  * NoData indicates that we will not be seeing a
313  * RowDescription message because the statement or portal
314  * inquired about doesn't return rows.
315  *
316  * If we're doing a Describe, we have to pass something
317  * back to the client, so set up a COMMAND_OK result,
318  * instead of PGRES_TUPLES_OK. Otherwise we can just
319  * ignore this message.
320  */
321  if (conn->queryclass == PGQUERY_DESCRIBE)
322  {
323  if (conn->result == NULL)
324  {
325  conn->result = PQmakeEmptyPGresult(conn,
327  if (!conn->result)
328  {
330  libpq_gettext("out of memory"));
331  pqSaveErrorResult(conn);
332  }
333  }
334  conn->asyncStatus = PGASYNC_READY;
335  }
336  break;
337  case 't': /* Parameter Description */
338  if (getParamDescriptions(conn, msgLength))
339  return;
340  /* getParamDescriptions() moves inStart itself */
341  continue;
342  case 'D': /* Data Row */
343  if (conn->result != NULL &&
345  {
346  /* Read another tuple of a normal query response */
347  if (getAnotherTuple(conn, msgLength))
348  return;
349  /* getAnotherTuple() moves inStart itself */
350  continue;
351  }
352  else if (conn->result != NULL &&
354  {
355  /*
356  * We've already choked for some reason. Just discard
357  * tuples till we get to the end of the query.
358  */
359  conn->inCursor += msgLength;
360  }
361  else
362  {
363  /* Set up to report error at end of query */
365  libpq_gettext("server sent data (\"D\" message) without prior row description (\"T\" message)\n"));
366  pqSaveErrorResult(conn);
367  /* Discard the unexpected message */
368  conn->inCursor += msgLength;
369  }
370  break;
371  case 'G': /* Start Copy In */
372  if (getCopyStart(conn, PGRES_COPY_IN))
373  return;
375  break;
376  case 'H': /* Start Copy Out */
377  if (getCopyStart(conn, PGRES_COPY_OUT))
378  return;
380  conn->copy_already_done = 0;
381  break;
382  case 'W': /* Start Copy Both */
383  if (getCopyStart(conn, PGRES_COPY_BOTH))
384  return;
386  conn->copy_already_done = 0;
387  break;
388  case 'd': /* Copy Data */
389 
390  /*
391  * If we see Copy Data, just silently drop it. This would
392  * only occur if application exits COPY OUT mode too
393  * early.
394  */
395  conn->inCursor += msgLength;
396  break;
397  case 'c': /* Copy Done */
398 
399  /*
400  * If we see Copy Done, just silently drop it. This is
401  * the normal case during PQendcopy. We will keep
402  * swallowing data, expecting to see command-complete for
403  * the COPY command.
404  */
405  break;
406  default:
409  "unexpected response from server; first received character was \"%c\"\n"),
410  id);
411  /* build an error result holding the error message */
412  pqSaveErrorResult(conn);
413  /* not sure if we will see more, so go to ready state */
414  conn->asyncStatus = PGASYNC_READY;
415  /* Discard the unexpected message */
416  conn->inCursor += msgLength;
417  break;
418  } /* switch on protocol character */
419  }
420  /* Successfully consumed this message */
421  if (conn->inCursor == conn->inStart + 5 + msgLength)
422  {
423  /* Normal case: parsing agrees with specified length */
424  conn->inStart = conn->inCursor;
425  }
426  else
427  {
428  /* Trouble --- report it */
430  libpq_gettext("message contents do not agree with length in message type \"%c\"\n"),
431  id);
432  /* build an error result holding the error message */
433  pqSaveErrorResult(conn);
434  conn->asyncStatus = PGASYNC_READY;
435  /* trust the specified message length as what to skip */
436  conn->inStart += 5 + msgLength;
437  }
438  }
439 }
440 
441 /*
442  * handleSyncLoss: clean up after loss of message-boundary sync
443  *
444  * There isn't really a lot we can do here except abandon the connection.
445  */
446 static void
447 handleSyncLoss(PGconn *conn, char id, int msgLength)
448 {
451  "lost synchronization with server: got message type \"%c\", length %d\n"),
452  id, msgLength);
453  /* build an error result holding the error message */
454  pqSaveErrorResult(conn);
455  conn->asyncStatus = PGASYNC_READY; /* drop out of GetResult wait loop */
456  /* flush input data since we're giving up on processing it */
457  pqDropConnection(conn, true);
458  conn->status = CONNECTION_BAD; /* No more connection to backend */
459 }
460 
461 /*
462  * parseInput subroutine to read a 'T' (row descriptions) message.
463  * We'll build a new PGresult structure (unless called for a Describe
464  * command for a prepared statement) containing the attribute data.
465  * Returns: 0 if processed message successfully, EOF to suspend parsing
466  * (the latter case is not actually used currently).
467  * In the former case, conn->inStart has been advanced past the message.
468  */
469 static int
471 {
472  PGresult *result;
473  int nfields;
474  const char *errmsg;
475  int i;
476 
477  /*
478  * When doing Describe for a prepared statement, there'll already be a
479  * PGresult created by getParamDescriptions, and we should fill data into
480  * that. Otherwise, create a new, empty PGresult.
481  */
482  if (conn->queryclass == PGQUERY_DESCRIBE)
483  {
484  if (conn->result)
485  result = conn->result;
486  else
487  result = PQmakeEmptyPGresult(conn, PGRES_COMMAND_OK);
488  }
489  else
490  result = PQmakeEmptyPGresult(conn, PGRES_TUPLES_OK);
491  if (!result)
492  {
493  errmsg = NULL; /* means "out of memory", see below */
494  goto advance_and_error;
495  }
496 
497  /* parseInput already read the 'T' label and message length. */
498  /* the next two bytes are the number of fields */
499  if (pqGetInt(&(result->numAttributes), 2, conn))
500  {
501  /* We should not run out of data here, so complain */
502  errmsg = libpq_gettext("insufficient data in \"T\" message");
503  goto advance_and_error;
504  }
505  nfields = result->numAttributes;
506 
507  /* allocate space for the attribute descriptors */
508  if (nfields > 0)
509  {
510  result->attDescs = (PGresAttDesc *)
511  pqResultAlloc(result, nfields * sizeof(PGresAttDesc), true);
512  if (!result->attDescs)
513  {
514  errmsg = NULL; /* means "out of memory", see below */
515  goto advance_and_error;
516  }
517  MemSet(result->attDescs, 0, nfields * sizeof(PGresAttDesc));
518  }
519 
520  /* result->binary is true only if ALL columns are binary */
521  result->binary = (nfields > 0) ? 1 : 0;
522 
523  /* get type info */
524  for (i = 0; i < nfields; i++)
525  {
526  int tableid;
527  int columnid;
528  int typid;
529  int typlen;
530  int atttypmod;
531  int format;
532 
533  if (pqGets(&conn->workBuffer, conn) ||
534  pqGetInt(&tableid, 4, conn) ||
535  pqGetInt(&columnid, 2, conn) ||
536  pqGetInt(&typid, 4, conn) ||
537  pqGetInt(&typlen, 2, conn) ||
538  pqGetInt(&atttypmod, 4, conn) ||
539  pqGetInt(&format, 2, conn))
540  {
541  /* We should not run out of data here, so complain */
542  errmsg = libpq_gettext("insufficient data in \"T\" message");
543  goto advance_and_error;
544  }
545 
546  /*
547  * Since pqGetInt treats 2-byte integers as unsigned, we need to
548  * coerce these results to signed form.
549  */
550  columnid = (int) ((int16) columnid);
551  typlen = (int) ((int16) typlen);
552  format = (int) ((int16) format);
553 
554  result->attDescs[i].name = pqResultStrdup(result,
555  conn->workBuffer.data);
556  if (!result->attDescs[i].name)
557  {
558  errmsg = NULL; /* means "out of memory", see below */
559  goto advance_and_error;
560  }
561  result->attDescs[i].tableid = tableid;
562  result->attDescs[i].columnid = columnid;
563  result->attDescs[i].format = format;
564  result->attDescs[i].typid = typid;
565  result->attDescs[i].typlen = typlen;
566  result->attDescs[i].atttypmod = atttypmod;
567 
568  if (format != 1)
569  result->binary = 0;
570  }
571 
572  /* Sanity check that we absorbed all the data */
573  if (conn->inCursor != conn->inStart + 5 + msgLength)
574  {
575  errmsg = libpq_gettext("extraneous data in \"T\" message");
576  goto advance_and_error;
577  }
578 
579  /* Success! */
580  conn->result = result;
581 
582  /* Advance inStart to show that the "T" message has been processed. */
583  conn->inStart = conn->inCursor;
584 
585  /*
586  * If we're doing a Describe, we're done, and ready to pass the result
587  * back to the client.
588  */
589  if (conn->queryclass == PGQUERY_DESCRIBE)
590  {
591  conn->asyncStatus = PGASYNC_READY;
592  return 0;
593  }
594 
595  /*
596  * We could perform additional setup for the new result set here, but for
597  * now there's nothing else to do.
598  */
599 
600  /* And we're done. */
601  return 0;
602 
603 advance_and_error:
604  /* Discard unsaved result, if any */
605  if (result && result != conn->result)
606  PQclear(result);
607 
608  /* Discard the failed message by pretending we read it */
609  conn->inStart += 5 + msgLength;
610 
611  /*
612  * Replace partially constructed result with an error result. First
613  * discard the old result to try to win back some memory.
614  */
615  pqClearAsyncResult(conn);
616 
617  /*
618  * If preceding code didn't provide an error message, assume "out of
619  * memory" was meant. The advantage of having this special case is that
620  * freeing the old result first greatly improves the odds that gettext()
621  * will succeed in providing a translation.
622  */
623  if (!errmsg)
624  errmsg = libpq_gettext("out of memory for query result");
625 
626  printfPQExpBuffer(&conn->errorMessage, "%s\n", errmsg);
627  pqSaveErrorResult(conn);
628 
629  /*
630  * Return zero to allow input parsing to continue. Subsequent "D"
631  * messages will be ignored until we get to end of data, since an error
632  * result is already set up.
633  */
634  return 0;
635 }
636 
637 /*
638  * parseInput subroutine to read a 't' (ParameterDescription) message.
639  * We'll build a new PGresult structure containing the parameter data.
640  * Returns: 0 if completed message, EOF if not enough data yet.
641  * In the former case, conn->inStart has been advanced past the message.
642  *
643  * Note that if we run out of data, we have to release the partially
644  * constructed PGresult, and rebuild it again next time. Fortunately,
645  * that shouldn't happen often, since 't' messages usually fit in a packet.
646  */
647 static int
649 {
650  PGresult *result;
651  const char *errmsg = NULL; /* means "out of memory", see below */
652  int nparams;
653  int i;
654 
655  result = PQmakeEmptyPGresult(conn, PGRES_COMMAND_OK);
656  if (!result)
657  goto advance_and_error;
658 
659  /* parseInput already read the 't' label and message length. */
660  /* the next two bytes are the number of parameters */
661  if (pqGetInt(&(result->numParameters), 2, conn))
662  goto not_enough_data;
663  nparams = result->numParameters;
664 
665  /* allocate space for the parameter descriptors */
666  if (nparams > 0)
667  {
668  result->paramDescs = (PGresParamDesc *)
669  pqResultAlloc(result, nparams * sizeof(PGresParamDesc), true);
670  if (!result->paramDescs)
671  goto advance_and_error;
672  MemSet(result->paramDescs, 0, nparams * sizeof(PGresParamDesc));
673  }
674 
675  /* get parameter info */
676  for (i = 0; i < nparams; i++)
677  {
678  int typid;
679 
680  if (pqGetInt(&typid, 4, conn))
681  goto not_enough_data;
682  result->paramDescs[i].typid = typid;
683  }
684 
685  /* Sanity check that we absorbed all the data */
686  if (conn->inCursor != conn->inStart + 5 + msgLength)
687  {
688  errmsg = libpq_gettext("extraneous data in \"t\" message");
689  goto advance_and_error;
690  }
691 
692  /* Success! */
693  conn->result = result;
694 
695  /* Advance inStart to show that the "t" message has been processed. */
696  conn->inStart = conn->inCursor;
697 
698  return 0;
699 
700 not_enough_data:
701  PQclear(result);
702  return EOF;
703 
704 advance_and_error:
705  /* Discard unsaved result, if any */
706  if (result && result != conn->result)
707  PQclear(result);
708 
709  /* Discard the failed message by pretending we read it */
710  conn->inStart += 5 + msgLength;
711 
712  /*
713  * Replace partially constructed result with an error result. First
714  * discard the old result to try to win back some memory.
715  */
716  pqClearAsyncResult(conn);
717 
718  /*
719  * If preceding code didn't provide an error message, assume "out of
720  * memory" was meant. The advantage of having this special case is that
721  * freeing the old result first greatly improves the odds that gettext()
722  * will succeed in providing a translation.
723  */
724  if (!errmsg)
725  errmsg = libpq_gettext("out of memory");
726  printfPQExpBuffer(&conn->errorMessage, "%s\n", errmsg);
727  pqSaveErrorResult(conn);
728 
729  /*
730  * Return zero to allow input parsing to continue. Essentially, we've
731  * replaced the COMMAND_OK result with an error result, but since this
732  * doesn't affect the protocol state, it's fine.
733  */
734  return 0;
735 }
736 
737 /*
738  * parseInput subroutine to read a 'D' (row data) message.
739  * We fill rowbuf with column pointers and then call the row processor.
740  * Returns: 0 if processed message successfully, EOF to suspend parsing
741  * (the latter case is not actually used currently).
742  * In the former case, conn->inStart has been advanced past the message.
743  */
744 static int
745 getAnotherTuple(PGconn *conn, int msgLength)
746 {
747  PGresult *result = conn->result;
748  int nfields = result->numAttributes;
749  const char *errmsg;
750  PGdataValue *rowbuf;
751  int tupnfields; /* # fields from tuple */
752  int vlen; /* length of the current field value */
753  int i;
754 
755  /* Get the field count and make sure it's what we expect */
756  if (pqGetInt(&tupnfields, 2, conn))
757  {
758  /* We should not run out of data here, so complain */
759  errmsg = libpq_gettext("insufficient data in \"D\" message");
760  goto advance_and_error;
761  }
762 
763  if (tupnfields != nfields)
764  {
765  errmsg = libpq_gettext("unexpected field count in \"D\" message");
766  goto advance_and_error;
767  }
768 
769  /* Resize row buffer if needed */
770  rowbuf = conn->rowBuf;
771  if (nfields > conn->rowBufLen)
772  {
773  rowbuf = (PGdataValue *) realloc(rowbuf,
774  nfields * sizeof(PGdataValue));
775  if (!rowbuf)
776  {
777  errmsg = NULL; /* means "out of memory", see below */
778  goto advance_and_error;
779  }
780  conn->rowBuf = rowbuf;
781  conn->rowBufLen = nfields;
782  }
783 
784  /* Scan the fields */
785  for (i = 0; i < nfields; i++)
786  {
787  /* get the value length */
788  if (pqGetInt(&vlen, 4, conn))
789  {
790  /* We should not run out of data here, so complain */
791  errmsg = libpq_gettext("insufficient data in \"D\" message");
792  goto advance_and_error;
793  }
794  rowbuf[i].len = vlen;
795 
796  /*
797  * rowbuf[i].value always points to the next address in the data
798  * buffer even if the value is NULL. This allows row processors to
799  * estimate data sizes more easily.
800  */
801  rowbuf[i].value = conn->inBuffer + conn->inCursor;
802 
803  /* Skip over the data value */
804  if (vlen > 0)
805  {
806  if (pqSkipnchar(vlen, conn))
807  {
808  /* We should not run out of data here, so complain */
809  errmsg = libpq_gettext("insufficient data in \"D\" message");
810  goto advance_and_error;
811  }
812  }
813  }
814 
815  /* Sanity check that we absorbed all the data */
816  if (conn->inCursor != conn->inStart + 5 + msgLength)
817  {
818  errmsg = libpq_gettext("extraneous data in \"D\" message");
819  goto advance_and_error;
820  }
821 
822  /* Advance inStart to show that the "D" message has been processed. */
823  conn->inStart = conn->inCursor;
824 
825  /* Process the collected row */
826  errmsg = NULL;
827  if (pqRowProcessor(conn, &errmsg))
828  return 0; /* normal, successful exit */
829 
830  goto set_error_result; /* pqRowProcessor failed, report it */
831 
832 advance_and_error:
833  /* Discard the failed message by pretending we read it */
834  conn->inStart += 5 + msgLength;
835 
836 set_error_result:
837 
838  /*
839  * Replace partially constructed result with an error result. First
840  * discard the old result to try to win back some memory.
841  */
842  pqClearAsyncResult(conn);
843 
844  /*
845  * If preceding code didn't provide an error message, assume "out of
846  * memory" was meant. The advantage of having this special case is that
847  * freeing the old result first greatly improves the odds that gettext()
848  * will succeed in providing a translation.
849  */
850  if (!errmsg)
851  errmsg = libpq_gettext("out of memory for query result");
852 
853  printfPQExpBuffer(&conn->errorMessage, "%s\n", errmsg);
854  pqSaveErrorResult(conn);
855 
856  /*
857  * Return zero to allow input parsing to continue. Subsequent "D"
858  * messages will be ignored until we get to end of data, since an error
859  * result is already set up.
860  */
861  return 0;
862 }
863 
864 
865 /*
866  * Attempt to read an Error or Notice response message.
867  * This is possible in several places, so we break it out as a subroutine.
868  * Entry: 'E' or 'N' message type and length have already been consumed.
869  * Exit: returns 0 if successfully consumed message.
870  * returns EOF if not enough data.
871  */
872 int
874 {
875  PGresult *res = NULL;
876  bool have_position = false;
877  PQExpBufferData workBuf;
878  char id;
879 
880  /*
881  * If this is an error message, pre-emptively clear any incomplete query
882  * result we may have. We'd just throw it away below anyway, and
883  * releasing it before collecting the error might avoid out-of-memory.
884  */
885  if (isError)
886  pqClearAsyncResult(conn);
887 
888  /*
889  * Since the fields might be pretty long, we create a temporary
890  * PQExpBuffer rather than using conn->workBuffer. workBuffer is intended
891  * for stuff that is expected to be short. We shouldn't use
892  * conn->errorMessage either, since this might be only a notice.
893  */
894  initPQExpBuffer(&workBuf);
895 
896  /*
897  * Make a PGresult to hold the accumulated fields. We temporarily lie
898  * about the result status, so that PQmakeEmptyPGresult doesn't uselessly
899  * copy conn->errorMessage.
900  *
901  * NB: This allocation can fail, if you run out of memory. The rest of the
902  * function handles that gracefully, and we still try to set the error
903  * message as the connection's error message.
904  */
906  if (res)
908 
909  /*
910  * Read the fields and save into res.
911  *
912  * While at it, save the SQLSTATE in conn->last_sqlstate, and note whether
913  * we saw a PG_DIAG_STATEMENT_POSITION field.
914  */
915  for (;;)
916  {
917  if (pqGetc(&id, conn))
918  goto fail;
919  if (id == '\0')
920  break; /* terminator found */
921  if (pqGets(&workBuf, conn))
922  goto fail;
923  pqSaveMessageField(res, id, workBuf.data);
924  if (id == PG_DIAG_SQLSTATE)
925  strlcpy(conn->last_sqlstate, workBuf.data,
926  sizeof(conn->last_sqlstate));
927  else if (id == PG_DIAG_STATEMENT_POSITION)
928  have_position = true;
929  }
930 
931  /*
932  * Save the active query text, if any, into res as well; but only if we
933  * might need it for an error cursor display, which is only true if there
934  * is a PG_DIAG_STATEMENT_POSITION field.
935  */
936  if (have_position && conn->last_query && res)
937  res->errQuery = pqResultStrdup(res, conn->last_query);
938 
939  /*
940  * Now build the "overall" error message for PQresultErrorMessage.
941  */
942  resetPQExpBuffer(&workBuf);
943  pqBuildErrorMessage3(&workBuf, res, conn->verbosity, conn->show_context);
944 
945  /*
946  * Either save error as current async result, or just emit the notice.
947  */
948  if (isError)
949  {
950  if (res)
951  res->errMsg = pqResultStrdup(res, workBuf.data);
952  pqClearAsyncResult(conn); /* redundant, but be safe */
953  conn->result = res;
954  if (PQExpBufferDataBroken(workBuf))
956  libpq_gettext("out of memory"));
957  else
958  appendPQExpBufferStr(&conn->errorMessage, workBuf.data);
959  }
960  else
961  {
962  /* if we couldn't allocate the result set, just discard the NOTICE */
963  if (res)
964  {
965  /* We can cheat a little here and not copy the message. */
966  res->errMsg = workBuf.data;
967  if (res->noticeHooks.noticeRec != NULL)
969  PQclear(res);
970  }
971  }
972 
973  termPQExpBuffer(&workBuf);
974  return 0;
975 
976 fail:
977  PQclear(res);
978  termPQExpBuffer(&workBuf);
979  return EOF;
980 }
981 
982 /*
983  * Construct an error message from the fields in the given PGresult,
984  * appending it to the contents of "msg".
985  */
986 void
988  PGVerbosity verbosity, PGContextVisibility show_context)
989 {
990  const char *val;
991  const char *querytext = NULL;
992  int querypos = 0;
993 
994  /* If we couldn't allocate a PGresult, just say "out of memory" */
995  if (res == NULL)
996  {
997  appendPQExpBufferStr(msg, libpq_gettext("out of memory\n"));
998  return;
999  }
1000 
1001  /*
1002  * If we don't have any broken-down fields, just return the base message.
1003  * This mainly applies if we're given a libpq-generated error result.
1004  */
1005  if (res->errFields == NULL)
1006  {
1007  if (res->errMsg && res->errMsg[0])
1008  appendPQExpBufferStr(msg, res->errMsg);
1009  else
1010  appendPQExpBufferStr(msg, libpq_gettext("no error message available\n"));
1011  return;
1012  }
1013 
1014  /* Else build error message from relevant fields */
1016  if (val)
1017  appendPQExpBuffer(msg, "%s: ", val);
1018 
1019  if (verbosity == PQERRORS_SQLSTATE)
1020  {
1021  /*
1022  * If we have a SQLSTATE, print that and nothing else. If not (which
1023  * shouldn't happen for server-generated errors, but might possibly
1024  * happen for libpq-generated ones), fall back to TERSE format, as
1025  * that seems better than printing nothing at all.
1026  */
1028  if (val)
1029  {
1030  appendPQExpBuffer(msg, "%s\n", val);
1031  return;
1032  }
1033  verbosity = PQERRORS_TERSE;
1034  }
1035 
1036  if (verbosity == PQERRORS_VERBOSE)
1037  {
1039  if (val)
1040  appendPQExpBuffer(msg, "%s: ", val);
1041  }
1043  if (val)
1044  appendPQExpBufferStr(msg, val);
1046  if (val)
1047  {
1048  if (verbosity != PQERRORS_TERSE && res->errQuery != NULL)
1049  {
1050  /* emit position as a syntax cursor display */
1051  querytext = res->errQuery;
1052  querypos = atoi(val);
1053  }
1054  else
1055  {
1056  /* emit position as text addition to primary message */
1057  /* translator: %s represents a digit string */
1058  appendPQExpBuffer(msg, libpq_gettext(" at character %s"),
1059  val);
1060  }
1061  }
1062  else
1063  {
1065  if (val)
1066  {
1067  querytext = PQresultErrorField(res, PG_DIAG_INTERNAL_QUERY);
1068  if (verbosity != PQERRORS_TERSE && querytext != NULL)
1069  {
1070  /* emit position as a syntax cursor display */
1071  querypos = atoi(val);
1072  }
1073  else
1074  {
1075  /* emit position as text addition to primary message */
1076  /* translator: %s represents a digit string */
1077  appendPQExpBuffer(msg, libpq_gettext(" at character %s"),
1078  val);
1079  }
1080  }
1081  }
1082  appendPQExpBufferChar(msg, '\n');
1083  if (verbosity != PQERRORS_TERSE)
1084  {
1085  if (querytext && querypos > 0)
1086  reportErrorPosition(msg, querytext, querypos,
1087  res->client_encoding);
1089  if (val)
1090  appendPQExpBuffer(msg, libpq_gettext("DETAIL: %s\n"), val);
1092  if (val)
1093  appendPQExpBuffer(msg, libpq_gettext("HINT: %s\n"), val);
1095  if (val)
1096  appendPQExpBuffer(msg, libpq_gettext("QUERY: %s\n"), val);
1097  if (show_context == PQSHOW_CONTEXT_ALWAYS ||
1098  (show_context == PQSHOW_CONTEXT_ERRORS &&
1100  {
1101  val = PQresultErrorField(res, PG_DIAG_CONTEXT);
1102  if (val)
1103  appendPQExpBuffer(msg, libpq_gettext("CONTEXT: %s\n"),
1104  val);
1105  }
1106  }
1107  if (verbosity == PQERRORS_VERBOSE)
1108  {
1110  if (val)
1111  appendPQExpBuffer(msg,
1112  libpq_gettext("SCHEMA NAME: %s\n"), val);
1114  if (val)
1115  appendPQExpBuffer(msg,
1116  libpq_gettext("TABLE NAME: %s\n"), val);
1118  if (val)
1119  appendPQExpBuffer(msg,
1120  libpq_gettext("COLUMN NAME: %s\n"), val);
1122  if (val)
1123  appendPQExpBuffer(msg,
1124  libpq_gettext("DATATYPE NAME: %s\n"), val);
1126  if (val)
1127  appendPQExpBuffer(msg,
1128  libpq_gettext("CONSTRAINT NAME: %s\n"), val);
1129  }
1130  if (verbosity == PQERRORS_VERBOSE)
1131  {
1132  const char *valf;
1133  const char *vall;
1134 
1138  if (val || valf || vall)
1139  {
1140  appendPQExpBufferStr(msg, libpq_gettext("LOCATION: "));
1141  if (val)
1142  appendPQExpBuffer(msg, libpq_gettext("%s, "), val);
1143  if (valf && vall) /* unlikely we'd have just one */
1144  appendPQExpBuffer(msg, libpq_gettext("%s:%s"),
1145  valf, vall);
1146  appendPQExpBufferChar(msg, '\n');
1147  }
1148  }
1149 }
1150 
1151 /*
1152  * Add an error-location display to the error message under construction.
1153  *
1154  * The cursor location is measured in logical characters; the query string
1155  * is presumed to be in the specified encoding.
1156  */
1157 static void
1158 reportErrorPosition(PQExpBuffer msg, const char *query, int loc, int encoding)
1159 {
1160 #define DISPLAY_SIZE 60 /* screen width limit, in screen cols */
1161 #define MIN_RIGHT_CUT 10 /* try to keep this far away from EOL */
1162 
1163  char *wquery;
1164  int slen,
1165  cno,
1166  i,
1167  *qidx,
1168  *scridx,
1169  qoffset,
1170  scroffset,
1171  ibeg,
1172  iend,
1173  loc_line;
1174  bool mb_encoding,
1175  beg_trunc,
1176  end_trunc;
1177 
1178  /* Convert loc from 1-based to 0-based; no-op if out of range */
1179  loc--;
1180  if (loc < 0)
1181  return;
1182 
1183  /* Need a writable copy of the query */
1184  wquery = strdup(query);
1185  if (wquery == NULL)
1186  return; /* fail silently if out of memory */
1187 
1188  /*
1189  * Each character might occupy multiple physical bytes in the string, and
1190  * in some Far Eastern character sets it might take more than one screen
1191  * column as well. We compute the starting byte offset and starting
1192  * screen column of each logical character, and store these in qidx[] and
1193  * scridx[] respectively.
1194  */
1195 
1196  /* we need a safe allocation size... */
1197  slen = strlen(wquery) + 1;
1198 
1199  qidx = (int *) malloc(slen * sizeof(int));
1200  if (qidx == NULL)
1201  {
1202  free(wquery);
1203  return;
1204  }
1205  scridx = (int *) malloc(slen * sizeof(int));
1206  if (scridx == NULL)
1207  {
1208  free(qidx);
1209  free(wquery);
1210  return;
1211  }
1212 
1213  /* We can optimize a bit if it's a single-byte encoding */
1214  mb_encoding = (pg_encoding_max_length(encoding) != 1);
1215 
1216  /*
1217  * Within the scanning loop, cno is the current character's logical
1218  * number, qoffset is its offset in wquery, and scroffset is its starting
1219  * logical screen column (all indexed from 0). "loc" is the logical
1220  * character number of the error location. We scan to determine loc_line
1221  * (the 1-based line number containing loc) and ibeg/iend (first character
1222  * number and last+1 character number of the line containing loc). Note
1223  * that qidx[] and scridx[] are filled only as far as iend.
1224  */
1225  qoffset = 0;
1226  scroffset = 0;
1227  loc_line = 1;
1228  ibeg = 0;
1229  iend = -1; /* -1 means not set yet */
1230 
1231  for (cno = 0; wquery[qoffset] != '\0'; cno++)
1232  {
1233  char ch = wquery[qoffset];
1234 
1235  qidx[cno] = qoffset;
1236  scridx[cno] = scroffset;
1237 
1238  /*
1239  * Replace tabs with spaces in the writable copy. (Later we might
1240  * want to think about coping with their variable screen width, but
1241  * not today.)
1242  */
1243  if (ch == '\t')
1244  wquery[qoffset] = ' ';
1245 
1246  /*
1247  * If end-of-line, count lines and mark positions. Each \r or \n
1248  * counts as a line except when \r \n appear together.
1249  */
1250  else if (ch == '\r' || ch == '\n')
1251  {
1252  if (cno < loc)
1253  {
1254  if (ch == '\r' ||
1255  cno == 0 ||
1256  wquery[qidx[cno - 1]] != '\r')
1257  loc_line++;
1258  /* extract beginning = last line start before loc. */
1259  ibeg = cno + 1;
1260  }
1261  else
1262  {
1263  /* set extract end. */
1264  iend = cno;
1265  /* done scanning. */
1266  break;
1267  }
1268  }
1269 
1270  /* Advance */
1271  if (mb_encoding)
1272  {
1273  int w;
1274 
1275  w = pg_encoding_dsplen(encoding, &wquery[qoffset]);
1276  /* treat any non-tab control chars as width 1 */
1277  if (w <= 0)
1278  w = 1;
1279  scroffset += w;
1280  qoffset += pg_encoding_mblen(encoding, &wquery[qoffset]);
1281  }
1282  else
1283  {
1284  /* We assume wide chars only exist in multibyte encodings */
1285  scroffset++;
1286  qoffset++;
1287  }
1288  }
1289  /* Fix up if we didn't find an end-of-line after loc */
1290  if (iend < 0)
1291  {
1292  iend = cno; /* query length in chars, +1 */
1293  qidx[iend] = qoffset;
1294  scridx[iend] = scroffset;
1295  }
1296 
1297  /* Print only if loc is within computed query length */
1298  if (loc <= cno)
1299  {
1300  /* If the line extracted is too long, we truncate it. */
1301  beg_trunc = false;
1302  end_trunc = false;
1303  if (scridx[iend] - scridx[ibeg] > DISPLAY_SIZE)
1304  {
1305  /*
1306  * We first truncate right if it is enough. This code might be
1307  * off a space or so on enforcing MIN_RIGHT_CUT if there's a wide
1308  * character right there, but that should be okay.
1309  */
1310  if (scridx[ibeg] + DISPLAY_SIZE >= scridx[loc] + MIN_RIGHT_CUT)
1311  {
1312  while (scridx[iend] - scridx[ibeg] > DISPLAY_SIZE)
1313  iend--;
1314  end_trunc = true;
1315  }
1316  else
1317  {
1318  /* Truncate right if not too close to loc. */
1319  while (scridx[loc] + MIN_RIGHT_CUT < scridx[iend])
1320  {
1321  iend--;
1322  end_trunc = true;
1323  }
1324 
1325  /* Truncate left if still too long. */
1326  while (scridx[iend] - scridx[ibeg] > DISPLAY_SIZE)
1327  {
1328  ibeg++;
1329  beg_trunc = true;
1330  }
1331  }
1332  }
1333 
1334  /* truncate working copy at desired endpoint */
1335  wquery[qidx[iend]] = '\0';
1336 
1337  /* Begin building the finished message. */
1338  i = msg->len;
1339  appendPQExpBuffer(msg, libpq_gettext("LINE %d: "), loc_line);
1340  if (beg_trunc)
1341  appendPQExpBufferStr(msg, "...");
1342 
1343  /*
1344  * While we have the prefix in the msg buffer, compute its screen
1345  * width.
1346  */
1347  scroffset = 0;
1348  for (; i < msg->len; i += pg_encoding_mblen(encoding, &msg->data[i]))
1349  {
1350  int w = pg_encoding_dsplen(encoding, &msg->data[i]);
1351 
1352  if (w <= 0)
1353  w = 1;
1354  scroffset += w;
1355  }
1356 
1357  /* Finish up the LINE message line. */
1358  appendPQExpBufferStr(msg, &wquery[qidx[ibeg]]);
1359  if (end_trunc)
1360  appendPQExpBufferStr(msg, "...");
1361  appendPQExpBufferChar(msg, '\n');
1362 
1363  /* Now emit the cursor marker line. */
1364  scroffset += scridx[loc] - scridx[ibeg];
1365  for (i = 0; i < scroffset; i++)
1366  appendPQExpBufferChar(msg, ' ');
1367  appendPQExpBufferChar(msg, '^');
1368  appendPQExpBufferChar(msg, '\n');
1369  }
1370 
1371  /* Clean up. */
1372  free(scridx);
1373  free(qidx);
1374  free(wquery);
1375 }
1376 
1377 
1378 /*
1379  * Attempt to read a ParameterStatus message.
1380  * This is possible in several places, so we break it out as a subroutine.
1381  * Entry: 'S' message type and length have already been consumed.
1382  * Exit: returns 0 if successfully consumed message.
1383  * returns EOF if not enough data.
1384  */
1385 static int
1387 {
1388  PQExpBufferData valueBuf;
1389 
1390  /* Get the parameter name */
1391  if (pqGets(&conn->workBuffer, conn))
1392  return EOF;
1393  /* Get the parameter value (could be large) */
1394  initPQExpBuffer(&valueBuf);
1395  if (pqGets(&valueBuf, conn))
1396  {
1397  termPQExpBuffer(&valueBuf);
1398  return EOF;
1399  }
1400  /* And save it */
1401  pqSaveParameterStatus(conn, conn->workBuffer.data, valueBuf.data);
1402  termPQExpBuffer(&valueBuf);
1403  return 0;
1404 }
1405 
1406 
1407 /*
1408  * Attempt to read a Notify response message.
1409  * This is possible in several places, so we break it out as a subroutine.
1410  * Entry: 'A' message type and length have already been consumed.
1411  * Exit: returns 0 if successfully consumed Notify message.
1412  * returns EOF if not enough data.
1413  */
1414 static int
1416 {
1417  int be_pid;
1418  char *svname;
1419  int nmlen;
1420  int extralen;
1421  PGnotify *newNotify;
1422 
1423  if (pqGetInt(&be_pid, 4, conn))
1424  return EOF;
1425  if (pqGets(&conn->workBuffer, conn))
1426  return EOF;
1427  /* must save name while getting extra string */
1428  svname = strdup(conn->workBuffer.data);
1429  if (!svname)
1430  return EOF;
1431  if (pqGets(&conn->workBuffer, conn))
1432  {
1433  free(svname);
1434  return EOF;
1435  }
1436 
1437  /*
1438  * Store the strings right after the PQnotify structure so it can all be
1439  * freed at once. We don't use NAMEDATALEN because we don't want to tie
1440  * this interface to a specific server name length.
1441  */
1442  nmlen = strlen(svname);
1443  extralen = strlen(conn->workBuffer.data);
1444  newNotify = (PGnotify *) malloc(sizeof(PGnotify) + nmlen + extralen + 2);
1445  if (newNotify)
1446  {
1447  newNotify->relname = (char *) newNotify + sizeof(PGnotify);
1448  strcpy(newNotify->relname, svname);
1449  newNotify->extra = newNotify->relname + nmlen + 1;
1450  strcpy(newNotify->extra, conn->workBuffer.data);
1451  newNotify->be_pid = be_pid;
1452  newNotify->next = NULL;
1453  if (conn->notifyTail)
1454  conn->notifyTail->next = newNotify;
1455  else
1456  conn->notifyHead = newNotify;
1457  conn->notifyTail = newNotify;
1458  }
1459 
1460  free(svname);
1461  return 0;
1462 }
1463 
1464 /*
1465  * getCopyStart - process CopyInResponse, CopyOutResponse or
1466  * CopyBothResponse message
1467  *
1468  * parseInput already read the message type and length.
1469  */
1470 static int
1472 {
1473  PGresult *result;
1474  int nfields;
1475  int i;
1476 
1477  result = PQmakeEmptyPGresult(conn, copytype);
1478  if (!result)
1479  goto failure;
1480 
1481  if (pqGetc(&conn->copy_is_binary, conn))
1482  goto failure;
1483  result->binary = conn->copy_is_binary;
1484  /* the next two bytes are the number of fields */
1485  if (pqGetInt(&(result->numAttributes), 2, conn))
1486  goto failure;
1487  nfields = result->numAttributes;
1488 
1489  /* allocate space for the attribute descriptors */
1490  if (nfields > 0)
1491  {
1492  result->attDescs = (PGresAttDesc *)
1493  pqResultAlloc(result, nfields * sizeof(PGresAttDesc), true);
1494  if (!result->attDescs)
1495  goto failure;
1496  MemSet(result->attDescs, 0, nfields * sizeof(PGresAttDesc));
1497  }
1498 
1499  for (i = 0; i < nfields; i++)
1500  {
1501  int format;
1502 
1503  if (pqGetInt(&format, 2, conn))
1504  goto failure;
1505 
1506  /*
1507  * Since pqGetInt treats 2-byte integers as unsigned, we need to
1508  * coerce these results to signed form.
1509  */
1510  format = (int) ((int16) format);
1511  result->attDescs[i].format = format;
1512  }
1513 
1514  /* Success! */
1515  conn->result = result;
1516  return 0;
1517 
1518 failure:
1519  PQclear(result);
1520  return EOF;
1521 }
1522 
1523 /*
1524  * getReadyForQuery - process ReadyForQuery message
1525  */
1526 static int
1528 {
1529  char xact_status;
1530 
1531  if (pqGetc(&xact_status, conn))
1532  return EOF;
1533  switch (xact_status)
1534  {
1535  case 'I':
1536  conn->xactStatus = PQTRANS_IDLE;
1537  break;
1538  case 'T':
1539  conn->xactStatus = PQTRANS_INTRANS;
1540  break;
1541  case 'E':
1542  conn->xactStatus = PQTRANS_INERROR;
1543  break;
1544  default:
1545  conn->xactStatus = PQTRANS_UNKNOWN;
1546  break;
1547  }
1548 
1549  return 0;
1550 }
1551 
1552 /*
1553  * getCopyDataMessage - fetch next CopyData message, process async messages
1554  *
1555  * Returns length word of CopyData message (> 0), or 0 if no complete
1556  * message available, -1 if end of copy, -2 if error.
1557  */
1558 static int
1560 {
1561  char id;
1562  int msgLength;
1563  int avail;
1564 
1565  for (;;)
1566  {
1567  /*
1568  * Do we have the next input message? To make life simpler for async
1569  * callers, we keep returning 0 until the next message is fully
1570  * available, even if it is not Copy Data.
1571  */
1572  conn->inCursor = conn->inStart;
1573  if (pqGetc(&id, conn))
1574  return 0;
1575  if (pqGetInt(&msgLength, 4, conn))
1576  return 0;
1577  if (msgLength < 4)
1578  {
1579  handleSyncLoss(conn, id, msgLength);
1580  return -2;
1581  }
1582  avail = conn->inEnd - conn->inCursor;
1583  if (avail < msgLength - 4)
1584  {
1585  /*
1586  * Before returning, enlarge the input buffer if needed to hold
1587  * the whole message. See notes in parseInput.
1588  */
1589  if (pqCheckInBufferSpace(conn->inCursor + (size_t) msgLength - 4,
1590  conn))
1591  {
1592  /*
1593  * XXX add some better recovery code... plan is to skip over
1594  * the message using its length, then report an error. For the
1595  * moment, just treat this like loss of sync (which indeed it
1596  * might be!)
1597  */
1598  handleSyncLoss(conn, id, msgLength);
1599  return -2;
1600  }
1601  return 0;
1602  }
1603 
1604  /*
1605  * If it's a legitimate async message type, process it. (NOTIFY
1606  * messages are not currently possible here, but we handle them for
1607  * completeness.) Otherwise, if it's anything except Copy Data,
1608  * report end-of-copy.
1609  */
1610  switch (id)
1611  {
1612  case 'A': /* NOTIFY */
1613  if (getNotify(conn))
1614  return 0;
1615  break;
1616  case 'N': /* NOTICE */
1617  if (pqGetErrorNotice3(conn, false))
1618  return 0;
1619  break;
1620  case 'S': /* ParameterStatus */
1621  if (getParameterStatus(conn))
1622  return 0;
1623  break;
1624  case 'd': /* Copy Data, pass it back to caller */
1625  return msgLength;
1626  case 'c':
1627 
1628  /*
1629  * If this is a CopyDone message, exit COPY_OUT mode and let
1630  * caller read status with PQgetResult(). If we're in
1631  * COPY_BOTH mode, return to COPY_IN mode.
1632  */
1633  if (conn->asyncStatus == PGASYNC_COPY_BOTH)
1634  conn->asyncStatus = PGASYNC_COPY_IN;
1635  else
1636  conn->asyncStatus = PGASYNC_BUSY;
1637  return -1;
1638  default: /* treat as end of copy */
1639 
1640  /*
1641  * Any other message terminates either COPY_IN or COPY_BOTH
1642  * mode.
1643  */
1644  conn->asyncStatus = PGASYNC_BUSY;
1645  return -1;
1646  }
1647 
1648  /* Drop the processed message and loop around for another */
1649  conn->inStart = conn->inCursor;
1650  }
1651 }
1652 
1653 /*
1654  * PQgetCopyData - read a row of data from the backend during COPY OUT
1655  * or COPY BOTH
1656  *
1657  * If successful, sets *buffer to point to a malloc'd row of data, and
1658  * returns row length (always > 0) as result.
1659  * Returns 0 if no row available yet (only possible if async is true),
1660  * -1 if end of copy (consult PQgetResult), or -2 if error (consult
1661  * PQerrorMessage).
1662  */
1663 int
1664 pqGetCopyData3(PGconn *conn, char **buffer, int async)
1665 {
1666  int msgLength;
1667 
1668  for (;;)
1669  {
1670  /*
1671  * Collect the next input message. To make life simpler for async
1672  * callers, we keep returning 0 until the next message is fully
1673  * available, even if it is not Copy Data.
1674  */
1675  msgLength = getCopyDataMessage(conn);
1676  if (msgLength < 0)
1677  return msgLength; /* end-of-copy or error */
1678  if (msgLength == 0)
1679  {
1680  /* Don't block if async read requested */
1681  if (async)
1682  return 0;
1683  /* Need to load more data */
1684  if (pqWait(true, false, conn) ||
1685  pqReadData(conn) < 0)
1686  return -2;
1687  continue;
1688  }
1689 
1690  /*
1691  * Drop zero-length messages (shouldn't happen anyway). Otherwise
1692  * pass the data back to the caller.
1693  */
1694  msgLength -= 4;
1695  if (msgLength > 0)
1696  {
1697  *buffer = (char *) malloc(msgLength + 1);
1698  if (*buffer == NULL)
1699  {
1701  libpq_gettext("out of memory\n"));
1702  return -2;
1703  }
1704  memcpy(*buffer, &conn->inBuffer[conn->inCursor], msgLength);
1705  (*buffer)[msgLength] = '\0'; /* Add terminating null */
1706 
1707  /* Mark message consumed */
1708  conn->inStart = conn->inCursor + msgLength;
1709 
1710  return msgLength;
1711  }
1712 
1713  /* Empty, so drop it and loop around for another */
1714  conn->inStart = conn->inCursor;
1715  }
1716 }
1717 
1718 /*
1719  * PQgetline - gets a newline-terminated string from the backend.
1720  *
1721  * See fe-exec.c for documentation.
1722  */
1723 int
1724 pqGetline3(PGconn *conn, char *s, int maxlen)
1725 {
1726  int status;
1727 
1728  if (conn->sock == PGINVALID_SOCKET ||
1729  (conn->asyncStatus != PGASYNC_COPY_OUT &&
1730  conn->asyncStatus != PGASYNC_COPY_BOTH) ||
1731  conn->copy_is_binary)
1732  {
1734  libpq_gettext("PQgetline: not doing text COPY OUT\n"));
1735  *s = '\0';
1736  return EOF;
1737  }
1738 
1739  while ((status = PQgetlineAsync(conn, s, maxlen - 1)) == 0)
1740  {
1741  /* need to load more data */
1742  if (pqWait(true, false, conn) ||
1743  pqReadData(conn) < 0)
1744  {
1745  *s = '\0';
1746  return EOF;
1747  }
1748  }
1749 
1750  if (status < 0)
1751  {
1752  /* End of copy detected; gin up old-style terminator */
1753  strcpy(s, "\\.");
1754  return 0;
1755  }
1756 
1757  /* Add null terminator, and strip trailing \n if present */
1758  if (s[status - 1] == '\n')
1759  {
1760  s[status - 1] = '\0';
1761  return 0;
1762  }
1763  else
1764  {
1765  s[status] = '\0';
1766  return 1;
1767  }
1768 }
1769 
1770 /*
1771  * PQgetlineAsync - gets a COPY data row without blocking.
1772  *
1773  * See fe-exec.c for documentation.
1774  */
1775 int
1776 pqGetlineAsync3(PGconn *conn, char *buffer, int bufsize)
1777 {
1778  int msgLength;
1779  int avail;
1780 
1781  if (conn->asyncStatus != PGASYNC_COPY_OUT
1782  && conn->asyncStatus != PGASYNC_COPY_BOTH)
1783  return -1; /* we are not doing a copy... */
1784 
1785  /*
1786  * Recognize the next input message. To make life simpler for async
1787  * callers, we keep returning 0 until the next message is fully available
1788  * even if it is not Copy Data. This should keep PQendcopy from blocking.
1789  * (Note: unlike pqGetCopyData3, we do not change asyncStatus here.)
1790  */
1791  msgLength = getCopyDataMessage(conn);
1792  if (msgLength < 0)
1793  return -1; /* end-of-copy or error */
1794  if (msgLength == 0)
1795  return 0; /* no data yet */
1796 
1797  /*
1798  * Move data from libpq's buffer to the caller's. In the case where a
1799  * prior call found the caller's buffer too small, we use
1800  * conn->copy_already_done to remember how much of the row was already
1801  * returned to the caller.
1802  */
1803  conn->inCursor += conn->copy_already_done;
1804  avail = msgLength - 4 - conn->copy_already_done;
1805  if (avail <= bufsize)
1806  {
1807  /* Able to consume the whole message */
1808  memcpy(buffer, &conn->inBuffer[conn->inCursor], avail);
1809  /* Mark message consumed */
1810  conn->inStart = conn->inCursor + avail;
1811  /* Reset state for next time */
1812  conn->copy_already_done = 0;
1813  return avail;
1814  }
1815  else
1816  {
1817  /* We must return a partial message */
1818  memcpy(buffer, &conn->inBuffer[conn->inCursor], bufsize);
1819  /* The message is NOT consumed from libpq's buffer */
1820  conn->copy_already_done += bufsize;
1821  return bufsize;
1822  }
1823 }
1824 
1825 /*
1826  * PQendcopy
1827  *
1828  * See fe-exec.c for documentation.
1829  */
1830 int
1832 {
1833  PGresult *result;
1834 
1835  if (conn->asyncStatus != PGASYNC_COPY_IN &&
1836  conn->asyncStatus != PGASYNC_COPY_OUT &&
1837  conn->asyncStatus != PGASYNC_COPY_BOTH)
1838  {
1840  libpq_gettext("no COPY in progress\n"));
1841  return 1;
1842  }
1843 
1844  /* Send the CopyDone message if needed */
1845  if (conn->asyncStatus == PGASYNC_COPY_IN ||
1846  conn->asyncStatus == PGASYNC_COPY_BOTH)
1847  {
1848  if (pqPutMsgStart('c', false, conn) < 0 ||
1849  pqPutMsgEnd(conn) < 0)
1850  return 1;
1851 
1852  /*
1853  * If we sent the COPY command in extended-query mode, we must issue a
1854  * Sync as well.
1855  */
1856  if (conn->queryclass != PGQUERY_SIMPLE)
1857  {
1858  if (pqPutMsgStart('S', false, conn) < 0 ||
1859  pqPutMsgEnd(conn) < 0)
1860  return 1;
1861  }
1862  }
1863 
1864  /*
1865  * make sure no data is waiting to be sent, abort if we are non-blocking
1866  * and the flush fails
1867  */
1868  if (pqFlush(conn) && pqIsnonblocking(conn))
1869  return 1;
1870 
1871  /* Return to active duty */
1872  conn->asyncStatus = PGASYNC_BUSY;
1874 
1875  /*
1876  * Non blocking connections may have to abort at this point. If everyone
1877  * played the game there should be no problem, but in error scenarios the
1878  * expected messages may not have arrived yet. (We are assuming that the
1879  * backend's packetizing will ensure that CommandComplete arrives along
1880  * with the CopyDone; are there corner cases where that doesn't happen?)
1881  */
1882  if (pqIsnonblocking(conn) && PQisBusy(conn))
1883  return 1;
1884 
1885  /* Wait for the completion response */
1886  result = PQgetResult(conn);
1887 
1888  /* Expecting a successful result */
1889  if (result && result->resultStatus == PGRES_COMMAND_OK)
1890  {
1891  PQclear(result);
1892  return 0;
1893  }
1894 
1895  /*
1896  * Trouble. For backwards-compatibility reasons, we issue the error
1897  * message as if it were a notice (would be nice to get rid of this
1898  * silliness, but too many apps probably don't handle errors from
1899  * PQendcopy reasonably). Note that the app can still obtain the error
1900  * status from the PGconn object.
1901  */
1902  if (conn->errorMessage.len > 0)
1903  {
1904  /* We have to strip the trailing newline ... pain in neck... */
1905  char svLast = conn->errorMessage.data[conn->errorMessage.len - 1];
1906 
1907  if (svLast == '\n')
1908  conn->errorMessage.data[conn->errorMessage.len - 1] = '\0';
1909  pqInternalNotice(&conn->noticeHooks, "%s", conn->errorMessage.data);
1910  conn->errorMessage.data[conn->errorMessage.len - 1] = svLast;
1911  }
1912 
1913  PQclear(result);
1914 
1915  return 1;
1916 }
1917 
1918 
1919 /*
1920  * PQfn - Send a function call to the POSTGRES backend.
1921  *
1922  * See fe-exec.c for documentation.
1923  */
1924 PGresult *
1926  int *result_buf, int *actual_result_len,
1927  int result_is_int,
1928  const PQArgBlock *args, int nargs)
1929 {
1930  bool needInput = false;
1932  char id;
1933  int msgLength;
1934  int avail;
1935  int i;
1936 
1937  /* PQfn already validated connection state */
1938 
1939  if (pqPutMsgStart('F', false, conn) < 0 || /* function call msg */
1940  pqPutInt(fnid, 4, conn) < 0 || /* function id */
1941  pqPutInt(1, 2, conn) < 0 || /* # of format codes */
1942  pqPutInt(1, 2, conn) < 0 || /* format code: BINARY */
1943  pqPutInt(nargs, 2, conn) < 0) /* # of args */
1944  {
1945  /* error message should be set up already */
1946  return NULL;
1947  }
1948 
1949  for (i = 0; i < nargs; ++i)
1950  { /* len.int4 + contents */
1951  if (pqPutInt(args[i].len, 4, conn))
1952  return NULL;
1953  if (args[i].len == -1)
1954  continue; /* it's NULL */
1955 
1956  if (args[i].isint)
1957  {
1958  if (pqPutInt(args[i].u.integer, args[i].len, conn))
1959  return NULL;
1960  }
1961  else
1962  {
1963  if (pqPutnchar((char *) args[i].u.ptr, args[i].len, conn))
1964  return NULL;
1965  }
1966  }
1967 
1968  if (pqPutInt(1, 2, conn) < 0) /* result format code: BINARY */
1969  return NULL;
1970 
1971  if (pqPutMsgEnd(conn) < 0 ||
1972  pqFlush(conn))
1973  return NULL;
1974 
1975  for (;;)
1976  {
1977  if (needInput)
1978  {
1979  /* Wait for some data to arrive (or for the channel to close) */
1980  if (pqWait(true, false, conn) ||
1981  pqReadData(conn) < 0)
1982  break;
1983  }
1984 
1985  /*
1986  * Scan the message. If we run out of data, loop around to try again.
1987  */
1988  needInput = true;
1989 
1990  conn->inCursor = conn->inStart;
1991  if (pqGetc(&id, conn))
1992  continue;
1993  if (pqGetInt(&msgLength, 4, conn))
1994  continue;
1995 
1996  /*
1997  * Try to validate message type/length here. A length less than 4 is
1998  * definitely broken. Large lengths should only be believed for a few
1999  * message types.
2000  */
2001  if (msgLength < 4)
2002  {
2003  handleSyncLoss(conn, id, msgLength);
2004  break;
2005  }
2006  if (msgLength > 30000 && !VALID_LONG_MESSAGE_TYPE(id))
2007  {
2008  handleSyncLoss(conn, id, msgLength);
2009  break;
2010  }
2011 
2012  /*
2013  * Can't process if message body isn't all here yet.
2014  */
2015  msgLength -= 4;
2016  avail = conn->inEnd - conn->inCursor;
2017  if (avail < msgLength)
2018  {
2019  /*
2020  * Before looping, enlarge the input buffer if needed to hold the
2021  * whole message. See notes in parseInput.
2022  */
2023  if (pqCheckInBufferSpace(conn->inCursor + (size_t) msgLength,
2024  conn))
2025  {
2026  /*
2027  * XXX add some better recovery code... plan is to skip over
2028  * the message using its length, then report an error. For the
2029  * moment, just treat this like loss of sync (which indeed it
2030  * might be!)
2031  */
2032  handleSyncLoss(conn, id, msgLength);
2033  break;
2034  }
2035  continue;
2036  }
2037 
2038  /*
2039  * We should see V or E response to the command, but might get N
2040  * and/or A notices first. We also need to swallow the final Z before
2041  * returning.
2042  */
2043  switch (id)
2044  {
2045  case 'V': /* function result */
2046  if (pqGetInt(actual_result_len, 4, conn))
2047  continue;
2048  if (*actual_result_len != -1)
2049  {
2050  if (result_is_int)
2051  {
2052  if (pqGetInt(result_buf, *actual_result_len, conn))
2053  continue;
2054  }
2055  else
2056  {
2057  if (pqGetnchar((char *) result_buf,
2058  *actual_result_len,
2059  conn))
2060  continue;
2061  }
2062  }
2063  /* correctly finished function result message */
2064  status = PGRES_COMMAND_OK;
2065  break;
2066  case 'E': /* error return */
2067  if (pqGetErrorNotice3(conn, true))
2068  continue;
2069  status = PGRES_FATAL_ERROR;
2070  break;
2071  case 'A': /* notify message */
2072  /* handle notify and go back to processing return values */
2073  if (getNotify(conn))
2074  continue;
2075  break;
2076  case 'N': /* notice */
2077  /* handle notice and go back to processing return values */
2078  if (pqGetErrorNotice3(conn, false))
2079  continue;
2080  break;
2081  case 'Z': /* backend is ready for new query */
2082  if (getReadyForQuery(conn))
2083  continue;
2084  /* consume the message and exit */
2085  conn->inStart += 5 + msgLength;
2086  /* if we saved a result object (probably an error), use it */
2087  if (conn->result)
2088  return pqPrepareAsyncResult(conn);
2089  return PQmakeEmptyPGresult(conn, status);
2090  case 'S': /* parameter status */
2091  if (getParameterStatus(conn))
2092  continue;
2093  break;
2094  default:
2095  /* The backend violates the protocol. */
2097  libpq_gettext("protocol error: id=0x%x\n"),
2098  id);
2099  pqSaveErrorResult(conn);
2100  /* trust the specified message length as what to skip */
2101  conn->inStart += 5 + msgLength;
2102  return pqPrepareAsyncResult(conn);
2103  }
2104  /* Completed this message, keep going */
2105  /* trust the specified message length as what to skip */
2106  conn->inStart += 5 + msgLength;
2107  needInput = false;
2108  }
2109 
2110  /*
2111  * We fall out of the loop only upon failing to read data.
2112  * conn->errorMessage has been set by pqWait or pqReadData. We want to
2113  * append it to any already-received error message.
2114  */
2115  pqSaveErrorResult(conn);
2116  return pqPrepareAsyncResult(conn);
2117 }
2118 
2119 
2120 /*
2121  * Construct startup packet
2122  *
2123  * Returns a malloc'd packet buffer, or NULL if out of memory
2124  */
2125 char *
2128 {
2129  char *startpacket;
2130 
2131  *packetlen = build_startup_packet(conn, NULL, options);
2132  startpacket = (char *) malloc(*packetlen);
2133  if (!startpacket)
2134  return NULL;
2135  *packetlen = build_startup_packet(conn, startpacket, options);
2136  return startpacket;
2137 }
2138 
2139 /*
2140  * Build a startup packet given a filled-in PGconn structure.
2141  *
2142  * We need to figure out how much space is needed, then fill it in.
2143  * To avoid duplicate logic, this routine is called twice: the first time
2144  * (with packet == NULL) just counts the space needed, the second time
2145  * (with packet == allocated space) fills it in. Return value is the number
2146  * of bytes used.
2147  */
2148 static int
2149 build_startup_packet(const PGconn *conn, char *packet,
2151 {
2152  int packet_len = 0;
2153  const PQEnvironmentOption *next_eo;
2154  const char *val;
2155 
2156  /* Protocol version comes first. */
2157  if (packet)
2158  {
2159  ProtocolVersion pv = pg_hton32(conn->pversion);
2160 
2161  memcpy(packet + packet_len, &pv, sizeof(ProtocolVersion));
2162  }
2163  packet_len += sizeof(ProtocolVersion);
2164 
2165  /* Add user name, database name, options */
2166 
2167 #define ADD_STARTUP_OPTION(optname, optval) \
2168  do { \
2169  if (packet) \
2170  strcpy(packet + packet_len, optname); \
2171  packet_len += strlen(optname) + 1; \
2172  if (packet) \
2173  strcpy(packet + packet_len, optval); \
2174  packet_len += strlen(optval) + 1; \
2175  } while(0)
2176 
2177  if (conn->pguser && conn->pguser[0])
2178  ADD_STARTUP_OPTION("user", conn->pguser);
2179  if (conn->dbName && conn->dbName[0])
2180  ADD_STARTUP_OPTION("database", conn->dbName);
2181  if (conn->replication && conn->replication[0])
2182  ADD_STARTUP_OPTION("replication", conn->replication);
2183  if (conn->pgoptions && conn->pgoptions[0])
2184  ADD_STARTUP_OPTION("options", conn->pgoptions);
2185  if (conn->send_appname)
2186  {
2187  /* Use appname if present, otherwise use fallback */
2188  val = conn->appname ? conn->appname : conn->fbappname;
2189  if (val && val[0])
2190  ADD_STARTUP_OPTION("application_name", val);
2191  }
2192 
2193  if (conn->client_encoding_initial && conn->client_encoding_initial[0])
2194  ADD_STARTUP_OPTION("client_encoding", conn->client_encoding_initial);
2195 
2196  /* Add any environment-driven GUC settings needed */
2197  for (next_eo = options; next_eo->envName; next_eo++)
2198  {
2199  if ((val = getenv(next_eo->envName)) != NULL)
2200  {
2201  if (pg_strcasecmp(val, "default") != 0)
2202  ADD_STARTUP_OPTION(next_eo->pgName, val);
2203  }
2204  }
2205 
2206  /* Add trailing terminator */
2207  if (packet)
2208  packet[packet_len] = '\0';
2209  packet_len++;
2210 
2211  return packet_len;
2212 }
int pqFlush(PGconn *conn)
Definition: fe-misc.c:997
PGContextVisibility show_context
Definition: libpq-int.h:437
signed short int16
Definition: c.h:346
int pqRowProcessor(PGconn *conn, const char **errmsgp)
Definition: fe-exec.c:1132
char * extra
Definition: libpq-fe.h:168
int inEnd
Definition: libpq-int.h:445
void printfPQExpBuffer(PQExpBuffer str, const char *fmt,...)
Definition: pqexpbuffer.c:237
PGMessageField * errFields
Definition: libpq-int.h:197
int inStart
Definition: libpq-int.h:443
#define PG_DIAG_MESSAGE_PRIMARY
Definition: postgres_ext.h:58
#define PG_DIAG_SCHEMA_NAME
Definition: postgres_ext.h:65
const char * envName
Definition: libpq-int.h:254
int pqGetline3(PGconn *conn, char *s, int maxlen)
#define PG_DIAG_MESSAGE_DETAIL
Definition: postgres_ext.h:59
void pqSaveParameterStatus(PGconn *conn, const char *name, const char *value)
Definition: fe-exec.c:1014
int rowBufLen
Definition: libpq-int.h:459
int pqGets(PQExpBuffer buf, PGconn *conn)
Definition: fe-misc.c:162
char * replication
Definition: libpq-int.h:346
#define PG_DIAG_COLUMN_NAME
Definition: postgres_ext.h:67
void termPQExpBuffer(PQExpBuffer str)
Definition: pqexpbuffer.c:131
#define pqIsnonblocking(conn)
Definition: libpq-int.h:786
PGresult * pqFunctionCall3(PGconn *conn, Oid fnid, int *result_buf, int *actual_result_len, int result_is_int, const PQArgBlock *args, int nargs)
void appendPQExpBufferStr(PQExpBuffer str, const char *data)
Definition: pqexpbuffer.c:369
PQExpBufferData workBuffer
Definition: libpq-int.h:514
#define PG_DIAG_TABLE_NAME
Definition: postgres_ext.h:66
int pqCheckInBufferSpace(size_t bytes_needed, PGconn *conn)
Definition: fe-misc.c:407
static int build_startup_packet(const PGconn *conn, char *packet, const PQEnvironmentOption *options)
const char * value
Definition: libpq-int.h:293
PGQueryClass queryclass
Definition: libpq-int.h:388
int PQgetlineAsync(PGconn *conn, char *buffer, int bufsize)
Definition: fe-exec.c:2565
#define PG_DIAG_SOURCE_LINE
Definition: postgres_ext.h:71
int pqPutMsgStart(char msg_type, bool force_len, PGconn *conn)
Definition: fe-misc.c:518
char copy_is_binary
Definition: libpq-int.h:395
PGnotify * notifyHead
Definition: libpq-int.h:397
char * dbName
Definition: libpq-int.h:345
#define MemSet(start, val, len)
Definition: c.h:962
int pqGetInt(int *result, size_t bytes, PGconn *conn)
Definition: fe-misc.c:266
ExecStatusType
Definition: libpq-fe.h:84
static int getParamDescriptions(PGconn *conn, int msgLength)
Definition: fe-protocol3.c:648
int pg_strcasecmp(const char *s1, const char *s2)
Definition: pgstrcasecmp.c:36
void pqDropConnection(PGconn *conn, bool flushInput)
Definition: fe-connect.c:457
#define PG_DIAG_INTERNAL_POSITION
Definition: postgres_ext.h:62
unsigned int Oid
Definition: postgres_ext.h:31
int pqGetnchar(char *s, size_t len, PGconn *conn)
Definition: fe-misc.c:194
#define PG_DIAG_SQLSTATE
Definition: postgres_ext.h:57
char * errMsg
Definition: libpq-int.h:196
#define CMDSTATUS_LEN
Definition: libpq-int.h:86
PGresult * pqPrepareAsyncResult(PGconn *conn)
Definition: fe-exec.c:826
int columnid
Definition: libpq-fe.h:242
PGresAttDesc * attDescs
Definition: libpq-int.h:171
PGresult * result
Definition: libpq-int.h:462
char * client_encoding_initial
Definition: libpq-int.h:341
#define DISPLAY_SIZE
#define malloc(a)
Definition: header.h:50
int pqPutInt(int value, size_t bytes, PGconn *conn)
Definition: fe-misc.c:306
int pqGetlineAsync3(PGconn *conn, char *buffer, int bufsize)
PGAsyncStatusType asyncStatus
Definition: libpq-int.h:386
#define PG_DIAG_SOURCE_FILE
Definition: postgres_ext.h:70
int pqEndcopy3(PGconn *conn)
#define ADD_STARTUP_OPTION(optname, optval)
static int getRowDescriptions(PGconn *conn, int msgLength)
Definition: fe-protocol3.c:470
#define pg_hton32(x)
Definition: pg_bswap.h:121
PGNoticeHooks noticeHooks
Definition: libpq-int.h:186
PGconn * conn
Definition: streamutil.c:54
int pqGetErrorNotice3(PGconn *conn, bool isError)
Definition: fe-protocol3.c:873
int be_pid
Definition: libpq-fe.h:167
void appendPQExpBuffer(PQExpBuffer str, const char *fmt,...)
Definition: pqexpbuffer.c:267
PGNoticeHooks noticeHooks
Definition: libpq-int.h:377
int pqReadData(PGconn *conn)
Definition: fe-misc.c:628
static void reportErrorPosition(PQExpBuffer msg, const char *query, int loc, int encoding)
int pg_encoding_max_length(int encoding)
Definition: wchar.c:1868
PGVerbosity verbosity
Definition: libpq-int.h:436
int pqWait(int forRead, int forWrite, PGconn *conn)
Definition: fe-misc.c:1020
PQnoticeReceiver noticeRec
Definition: libpq-int.h:152
static int getAnotherTuple(PGconn *conn, int msgLength)
Definition: fe-protocol3.c:745
int pg_encoding_mblen(int encoding, const char *mbstr)
Definition: wchar.c:1833
void pqInternalNotice(const PGNoticeHooks *hooks, const char *fmt,...)
Definition: fe-exec.c:871
char * appname
Definition: libpq-int.h:343
#define PG_DIAG_SEVERITY
Definition: postgres_ext.h:55
int pg_encoding_dsplen(int encoding, const char *mbstr)
Definition: wchar.c:1844
int numParameters
Definition: libpq-int.h:175
PGresult * PQmakeEmptyPGresult(PGconn *conn, ExecStatusType status)
Definition: fe-exec.c:141
char * last_query
Definition: libpq-int.h:389
char * relname
Definition: libpq-fe.h:166
PGdataValue * rowBuf
Definition: libpq-int.h:458
#define PG_DIAG_STATEMENT_POSITION
Definition: postgres_ext.h:61
int binary
Definition: libpq-int.h:179
char * pguser
Definition: libpq-int.h:347
const char * pgName
Definition: libpq-int.h:254
pgsocket sock
Definition: libpq-int.h:407
char * errQuery
Definition: libpq-int.h:198
int numAttributes
Definition: libpq-int.h:170
uint32 ProtocolVersion
Definition: pqcomm.h:113
int pqGetc(char *result, PGconn *conn)
Definition: fe-misc.c:93
int pqGetCopyData3(PGconn *conn, char **buffer, int async)
void pqSaveMessageField(PGresult *res, char code, const char *value)
Definition: fe-exec.c:993
PGContextVisibility
Definition: libpq-fe.h:120
#define PGINVALID_SOCKET
Definition: port.h:33
char * inBuffer
Definition: libpq-int.h:441
struct pgNotify * next
Definition: libpq-fe.h:170
void appendPQExpBufferChar(PQExpBuffer str, char ch)
Definition: pqexpbuffer.c:380
#define PG_DIAG_DATATYPE_NAME
Definition: postgres_ext.h:68
#define PG_DIAG_CONSTRAINT_NAME
Definition: postgres_ext.h:69
PGVerbosity
Definition: libpq-fe.h:112
int atttypmod
Definition: libpq-fe.h:246
#define VALID_LONG_MESSAGE_TYPE(id)
Definition: fe-protocol3.c:38
#define MIN_RIGHT_CUT
static int getCopyDataMessage(PGconn *conn)
PQExpBufferData errorMessage
Definition: libpq-int.h:511
#define PG_DIAG_INTERNAL_QUERY
Definition: postgres_ext.h:63
#define PG_DIAG_MESSAGE_HINT
Definition: postgres_ext.h:60
void PQclear(PGresult *res)
Definition: fe-exec.c:694
#define free(a)
Definition: header.h:65
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45
#define PQExpBufferDataBroken(buf)
Definition: pqexpbuffer.h:67
void * pqResultAlloc(PGresult *res, size_t nBytes, bool isBinary)
Definition: fe-exec.c:534
PGresParamDesc * paramDescs
Definition: libpq-int.h:176
char * PQresultErrorField(const PGresult *res, int fieldcode)
Definition: fe-exec.c:2754
char * pgoptions
Definition: libpq-int.h:342
int pqPutnchar(const char *s, size_t len, PGconn *conn)
Definition: fe-misc.c:245
static int getReadyForQuery(PGconn *conn)
int PQisBusy(PGconn *conn)
Definition: fe-exec.c:1754
char * pqBuildStartupPacket3(PGconn *conn, int *packetlen, const PQEnvironmentOption *options)
static int getCopyStart(PGconn *conn, ExecStatusType copytype)
ProtocolVersion pversion
Definition: libpq-int.h:411
char cmdStatus[CMDSTATUS_LEN]
Definition: libpq-int.h:178
ConnStatusType status
Definition: libpq-int.h:385
int be_key
Definition: libpq-int.h:432
int pqPutMsgEnd(PGconn *conn)
Definition: fe-misc.c:586
int32 encoding
Definition: pg_database.h:41
PGnotify * notifyTail
Definition: libpq-int.h:398
int copy_already_done
Definition: libpq-int.h:396
#define realloc(a, b)
Definition: header.h:60
static int getParameterStatus(PGconn *conn)
static int getNotify(PGconn *conn)
int errmsg(const char *fmt,...)
Definition: elog.c:822
int i
static void handleSyncLoss(PGconn *conn, char id, int msgLength)
Definition: fe-protocol3.c:447
char * fbappname
Definition: libpq-int.h:344
char * name
Definition: libpq-fe.h:240
int pqSkipnchar(size_t len, PGconn *conn)
Definition: fe-misc.c:223
void pqBuildErrorMessage3(PQExpBuffer msg, const PGresult *res, PGVerbosity verbosity, PGContextVisibility show_context)
Definition: fe-protocol3.c:987
static char format
void pqClearAsyncResult(PGconn *conn)
Definition: fe-exec.c:749
void pqSaveErrorResult(PGconn *conn)
Definition: fe-exec.c:772
int inCursor
Definition: libpq-int.h:444
void pqParseInput3(PGconn *conn)
Definition: fe-protocol3.c:63
void resetPQExpBuffer(PQExpBuffer str)
Definition: pqexpbuffer.c:148
static void static void status(const char *fmt,...) pg_attribute_printf(1
Definition: pg_regress.c:226
int be_pid
Definition: libpq-int.h:431
#define PG_DIAG_SOURCE_FUNCTION
Definition: postgres_ext.h:72
ExecStatusType resultStatus
Definition: libpq-int.h:177
long val
Definition: informix.c:664
PGresult * PQgetResult(PGconn *conn)
Definition: fe-exec.c:1778
int * ptr
Definition: libpq-fe.h:229
void initPQExpBuffer(PQExpBuffer str)
Definition: pqexpbuffer.c:92
#define PG_DIAG_CONTEXT
Definition: postgres_ext.h:64
#define libpq_gettext(x)
Definition: libpq-int.h:792
int integer
Definition: libpq-fe.h:230
bool send_appname
Definition: libpq-int.h:428
PGTransactionStatusType xactStatus
Definition: libpq-int.h:387
char * pqResultStrdup(PGresult *res, const char *str)
Definition: fe-exec.c:646
void * noticeRecArg
Definition: libpq-int.h:153
int client_encoding
Definition: libpq-int.h:189
char last_sqlstate[6]
Definition: libpq-int.h:390