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libpq-int.h
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1 /*-------------------------------------------------------------------------
2  *
3  * libpq-int.h
4  * This file contains internal definitions meant to be used only by
5  * the frontend libpq library, not by applications that call it.
6  *
7  * An application can include this file if it wants to bypass the
8  * official API defined by libpq-fe.h, but code that does so is much
9  * more likely to break across PostgreSQL releases than code that uses
10  * only the official API.
11  *
12  * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
13  * Portions Copyright (c) 1994, Regents of the University of California
14  *
15  * src/interfaces/libpq/libpq-int.h
16  *
17  *-------------------------------------------------------------------------
18  */
19 
20 #ifndef LIBPQ_INT_H
21 #define LIBPQ_INT_H
22 
23 /* We assume libpq-fe.h has already been included. */
24 #include "libpq-events.h"
25 
26 #include <time.h>
27 #ifndef WIN32
28 #include <sys/time.h>
29 #endif
30 
31 #ifdef ENABLE_THREAD_SAFETY
32 #ifdef WIN32
33 #include "pthread-win32.h"
34 #else
35 #include <pthread.h>
36 #endif
37 #include <signal.h>
38 #endif
39 
40 /* include stuff common to fe and be */
41 #include "getaddrinfo.h"
42 #include "libpq/pqcomm.h"
43 /* include stuff found in fe only */
44 #include "pqexpbuffer.h"
45 
46 #ifdef ENABLE_GSS
47 #if defined(HAVE_GSSAPI_H)
48 #include <gssapi.h>
49 #else
50 #include <gssapi/gssapi.h>
51 #endif
52 #endif
53 
54 #ifdef ENABLE_SSPI
55 #define SECURITY_WIN32
56 #if defined(WIN32) && !defined(WIN32_ONLY_COMPILER)
57 #include <ntsecapi.h>
58 #endif
59 #include <security.h>
60 #undef SECURITY_WIN32
61 
62 #ifndef ENABLE_GSS
63 /*
64  * Define a fake structure compatible with GSSAPI on Unix.
65  */
66 typedef struct
67 {
68  void *value;
69  int length;
70 } gss_buffer_desc;
71 #endif
72 #endif /* ENABLE_SSPI */
73 
74 #ifdef USE_OPENSSL
75 #include <openssl/ssl.h>
76 #include <openssl/err.h>
77 
78 #ifndef OPENSSL_NO_ENGINE
79 #define USE_SSL_ENGINE
80 #endif
81 #endif /* USE_OPENSSL */
82 
83 /*
84  * POSTGRES backend dependent Constants.
85  */
86 #define CMDSTATUS_LEN 64 /* should match COMPLETION_TAG_BUFSIZE */
87 
88 /*
89  * PGresult and the subsidiary types PGresAttDesc, PGresAttValue
90  * represent the result of a query (or more precisely, of a single SQL
91  * command --- a query string given to PQexec can contain multiple commands).
92  * Note we assume that a single command can return at most one tuple group,
93  * hence there is no need for multiple descriptor sets.
94  */
95 
96 /* Subsidiary-storage management structure for PGresult.
97  * See space management routines in fe-exec.c for details.
98  * Note that space[k] refers to the k'th byte starting from the physical
99  * head of the block --- it's a union, not a struct!
100  */
102 
104 {
105  PGresult_data *next; /* link to next block, or NULL */
106  char space[1]; /* dummy for accessing block as bytes */
107 };
108 
109 /* Data about a single parameter of a prepared statement */
110 typedef struct pgresParamDesc
111 {
112  Oid typid; /* type id */
114 
115 /*
116  * Data for a single attribute of a single tuple
117  *
118  * We use char* for Attribute values.
119  *
120  * The value pointer always points to a null-terminated area; we add a
121  * null (zero) byte after whatever the backend sends us. This is only
122  * particularly useful for text values ... with a binary value, the
123  * value might have embedded nulls, so the application can't use C string
124  * operators on it. But we add a null anyway for consistency.
125  * Note that the value itself does not contain a length word.
126  *
127  * A NULL attribute is a special case in two ways: its len field is NULL_LEN
128  * and its value field points to null_field in the owning PGresult. All the
129  * NULL attributes in a query result point to the same place (there's no need
130  * to store a null string separately for each one).
131  */
132 
133 #define NULL_LEN (-1) /* pg_result len for NULL value */
134 
135 typedef struct pgresAttValue
136 {
137  int len; /* length in bytes of the value */
138  char *value; /* actual value, plus terminating zero byte */
139 } PGresAttValue;
140 
141 /* Typedef for message-field list entries */
142 typedef struct pgMessageField
143 {
144  struct pgMessageField *next; /* list link */
145  char code; /* field code */
146  char contents[FLEXIBLE_ARRAY_MEMBER]; /* value, nul-terminated */
148 
149 /* Fields needed for notice handling */
150 typedef struct
151 {
152  PQnoticeReceiver noticeRec; /* notice message receiver */
154  PQnoticeProcessor noticeProc; /* notice message processor */
156 } PGNoticeHooks;
157 
158 typedef struct PGEvent
159 {
160  PGEventProc proc; /* the function to call on events */
161  char *name; /* used only for error messages */
162  void *passThrough; /* pointer supplied at registration time */
163  void *data; /* optional state (instance) data */
164  bool resultInitialized; /* T if RESULTCREATE/COPY succeeded */
165 } PGEvent;
166 
167 struct pg_result
168 {
169  int ntups;
172  PGresAttValue **tuples; /* each PGresTuple is an array of
173  * PGresAttValue's */
174  int tupArrSize; /* allocated size of tuples array */
178  char cmdStatus[CMDSTATUS_LEN]; /* cmd status from the query */
179  int binary; /* binary tuple values if binary == 1,
180  * otherwise text */
181 
182  /*
183  * These fields are copied from the originating PGconn, so that operations
184  * on the PGresult don't have to reference the PGconn.
185  */
188  int nEvents;
189  int client_encoding; /* encoding id */
190 
191  /*
192  * Error information (all NULL if not an error result). errMsg is the
193  * "overall" error message returned by PQresultErrorMessage. If we have
194  * per-field info then it is stored in a linked list.
195  */
196  char *errMsg; /* error message, or NULL if no error */
197  PGMessageField *errFields; /* message broken into fields */
198  char *errQuery; /* text of triggering query, if available */
199 
200  /* All NULL attributes in the query result point to this null string */
201  char null_field[1];
202 
203  /*
204  * Space management information. Note that attDescs and error stuff, if
205  * not null, point into allocated blocks. But tuples points to a
206  * separately malloc'd block, so that we can realloc it.
207  */
208  PGresult_data *curBlock; /* most recently allocated block */
209  int curOffset; /* start offset of free space in block */
210  int spaceLeft; /* number of free bytes remaining in block */
211 };
212 
213 /* PGAsyncStatusType defines the state of the query-execution state machine */
214 typedef enum
215 {
216  PGASYNC_IDLE, /* nothing's happening, dude */
217  PGASYNC_BUSY, /* query in progress */
218  PGASYNC_READY, /* result ready for PQgetResult */
219  PGASYNC_COPY_IN, /* Copy In data transfer in progress */
220  PGASYNC_COPY_OUT, /* Copy Out data transfer in progress */
221  PGASYNC_COPY_BOTH /* Copy In/Out data transfer in progress */
223 
224 /* PGQueryClass tracks which query protocol we are now executing */
225 typedef enum
226 {
227  PGQUERY_SIMPLE, /* simple Query protocol (PQexec) */
228  PGQUERY_EXTENDED, /* full Extended protocol (PQexecParams) */
229  PGQUERY_PREPARE, /* Parse only (PQprepare) */
230  PGQUERY_DESCRIBE /* Describe Statement or Portal */
231 } PGQueryClass;
232 
233 /* PGSetenvStatusType defines the state of the PQSetenv state machine */
234 /* (this is used only for 2.0-protocol connections) */
235 typedef enum
236 {
237  SETENV_STATE_CLIENT_ENCODING_SEND, /* About to send an Environment Option */
238  SETENV_STATE_CLIENT_ENCODING_WAIT, /* Waiting for above send to complete */
239  SETENV_STATE_OPTION_SEND, /* About to send an Environment Option */
240  SETENV_STATE_OPTION_WAIT, /* Waiting for above send to complete */
241  SETENV_STATE_QUERY1_SEND, /* About to send a status query */
242  SETENV_STATE_QUERY1_WAIT, /* Waiting for query to complete */
243  SETENV_STATE_QUERY2_SEND, /* About to send a status query */
244  SETENV_STATE_QUERY2_WAIT, /* Waiting for query to complete */
247 
248 /* Typedef for the EnvironmentOptions[] array */
249 typedef struct PQEnvironmentOption
250 {
251  const char *envName, /* name of an environment variable */
252  *pgName; /* name of corresponding SET variable */
254 
255 /* Typedef for parameter-status list entries */
256 typedef struct pgParameterStatus
257 {
258  struct pgParameterStatus *next; /* list link */
259  char *name; /* parameter name */
260  char *value; /* parameter value */
261  /* Note: name and value are stored in same malloc block as struct is */
263 
264 /* large-object-access data ... allocated only if large-object code is used. */
265 typedef struct pgLobjfuncs
266 {
267  Oid fn_lo_open; /* OID of backend function lo_open */
268  Oid fn_lo_close; /* OID of backend function lo_close */
269  Oid fn_lo_creat; /* OID of backend function lo_creat */
270  Oid fn_lo_create; /* OID of backend function lo_create */
271  Oid fn_lo_unlink; /* OID of backend function lo_unlink */
272  Oid fn_lo_lseek; /* OID of backend function lo_lseek */
273  Oid fn_lo_lseek64; /* OID of backend function lo_lseek64 */
274  Oid fn_lo_tell; /* OID of backend function lo_tell */
275  Oid fn_lo_tell64; /* OID of backend function lo_tell64 */
276  Oid fn_lo_truncate; /* OID of backend function lo_truncate */
277  Oid fn_lo_truncate64; /* OID of function lo_truncate64 */
278  Oid fn_lo_read; /* OID of backend function LOread */
279  Oid fn_lo_write; /* OID of backend function LOwrite */
280 } PGlobjfuncs;
281 
282 /* PGdataValue represents a data field value being passed to a row processor.
283  * It could be either text or binary data; text data is not zero-terminated.
284  * A SQL NULL is represented by len < 0; then value is still valid but there
285  * are no data bytes there.
286  */
287 typedef struct pgDataValue
288 {
289  int len; /* data length in bytes, or <0 if NULL */
290  const char *value; /* data value, without zero-termination */
291 } PGdataValue;
292 
293 typedef enum pg_conn_host_type
294 {
299 
300 /*
301  * pg_conn_host stores all information about one of possibly several hosts
302  * mentioned in the connection string. Derived by splitting the pghost
303  * on the comma character and then parsing each segment.
304  */
305 typedef struct pg_conn_host
306 {
307  char *host; /* host name or address, or socket path */
308  pg_conn_host_type type; /* type of host */
309  char *port; /* port number for this host; if not NULL,
310  * overrides the PGConn's pgport */
311  char *password; /* password for this host, read from the
312  * password file. only set if the PGconn's
313  * pgpass field is NULL. */
314  struct addrinfo *addrlist; /* list of possible backend addresses */
315 } pg_conn_host;
316 
317 /*
318  * PGconn stores all the state data associated with a single connection
319  * to a backend.
320  */
321 struct pg_conn
322 {
323  /* Saved values of connection options */
324  char *pghost; /* the machine on which the server is running,
325  * or a path to a UNIX-domain socket, or a
326  * comma-separated list of machines and/or
327  * paths, optionally with port suffixes; if
328  * NULL, use DEFAULT_PGSOCKET_DIR */
329  char *pghostaddr; /* the numeric IP address of the machine on
330  * which the server is running. Takes
331  * precedence over above. */
332  char *pgport; /* the server's communication port number */
333  char *pgtty; /* tty on which the backend messages is
334  * displayed (OBSOLETE, NOT USED) */
335  char *connect_timeout; /* connection timeout (numeric string) */
336  char *client_encoding_initial; /* encoding to use */
337  char *pgoptions; /* options to start the backend with */
338  char *appname; /* application name */
339  char *fbappname; /* fallback application name */
340  char *dbName; /* database name */
341  char *replication; /* connect as the replication standby? */
342  char *pguser; /* Postgres username and password, if any */
343  char *pgpass;
344  char *pgpassfile; /* path to a file containing password(s) */
345  char *keepalives; /* use TCP keepalives? */
346  char *keepalives_idle; /* time between TCP keepalives */
347  char *keepalives_interval; /* time between TCP keepalive
348  * retransmits */
349  char *keepalives_count; /* maximum number of TCP keepalive
350  * retransmits */
351  char *sslmode; /* SSL mode (require,prefer,allow,disable) */
352  char *sslcompression; /* SSL compression (0 or 1) */
353  char *sslkey; /* client key filename */
354  char *sslcert; /* client certificate filename */
355  char *sslrootcert; /* root certificate filename */
356  char *sslcrl; /* certificate revocation list filename */
357  char *requirepeer; /* required peer credentials for local sockets */
358 
359 #if defined(ENABLE_GSS) || defined(ENABLE_SSPI)
360  char *krbsrvname; /* Kerberos service name */
361 #endif
362 
363  char *target_session_attrs; /* Type of connection to make
364  * Possible values any, read-write. */
365 
366  /* Optional file to write trace info to */
367  FILE *Pfdebug;
368 
369  /* Callback procedures for notice message processing */
371 
372  /* Event procs registered via PQregisterEventProc */
373  PGEvent *events; /* expandable array of event data */
374  int nEvents; /* number of active events */
375  int eventArraySize; /* allocated array size */
376 
377  /* Status indicators */
380  PGTransactionStatusType xactStatus; /* never changes to ACTIVE */
382  char *last_query; /* last SQL command, or NULL if unknown */
383  char last_sqlstate[6]; /* last reported SQLSTATE */
384  bool options_valid; /* true if OK to attempt connection */
385  bool nonblocking; /* whether this connection is using nonblock
386  * sending semantics */
387  bool singleRowMode; /* return current query result row-by-row? */
388  char copy_is_binary; /* 1 = copy binary, 0 = copy text */
389  int copy_already_done; /* # bytes already returned in COPY
390  * OUT */
391  PGnotify *notifyHead; /* oldest unreported Notify msg */
392  PGnotify *notifyTail; /* newest unreported Notify msg */
393 
394  /* Support for multiple hosts in connection string */
395  int nconnhost; /* # of possible hosts */
396  int whichhost; /* host we're currently considering */
397  pg_conn_host *connhost; /* details about each possible host */
398 
399  /* Connection data */
400  pgsocket sock; /* FD for socket, PGINVALID_SOCKET if
401  * unconnected */
402  SockAddr laddr; /* Local address */
403  SockAddr raddr; /* Remote address */
404  ProtocolVersion pversion; /* FE/BE protocol version in use */
405  int sversion; /* server version, e.g. 70401 for 7.4.1 */
406  bool auth_req_received; /* true if any type of auth req
407  * received */
408  bool password_needed; /* true if server demanded a password */
409  bool pgpassfile_used; /* true if password is from pgpassfile */
410  bool sigpipe_so; /* have we masked SIGPIPE via SO_NOSIGPIPE? */
411  bool sigpipe_flag; /* can we mask SIGPIPE via MSG_NOSIGNAL? */
412 
413  /* Transient state needed while establishing connection */
414  struct addrinfo *addr_cur; /* backend address currently being tried */
415  PGSetenvStatusType setenv_state; /* for 2.0 protocol only */
417  bool send_appname; /* okay to send application_name? */
418 
419  /* Miscellaneous stuff */
420  int be_pid; /* PID of backend --- needed for cancels */
421  int be_key; /* key of backend --- needed for cancels */
422  char md5Salt[4]; /* password salt received from backend */
423  pgParameterStatus *pstatus; /* ParameterStatus data */
424  int client_encoding; /* encoding id */
425  bool std_strings; /* standard_conforming_strings */
426  PGVerbosity verbosity; /* error/notice message verbosity */
427  PGContextVisibility show_context; /* whether to show CONTEXT field */
428  PGlobjfuncs *lobjfuncs; /* private state for large-object access fns */
429 
430  /* Buffer for data received from backend and not yet processed */
431  char *inBuffer; /* currently allocated buffer */
432  int inBufSize; /* allocated size of buffer */
433  int inStart; /* offset to first unconsumed data in buffer */
434  int inCursor; /* next byte to tentatively consume */
435  int inEnd; /* offset to first position after avail data */
436 
437  /* Buffer for data not yet sent to backend */
438  char *outBuffer; /* currently allocated buffer */
439  int outBufSize; /* allocated size of buffer */
440  int outCount; /* number of chars waiting in buffer */
441 
442  /* State for constructing messages in outBuffer */
443  int outMsgStart; /* offset to msg start (length word); if -1,
444  * msg has no length word */
445  int outMsgEnd; /* offset to msg end (so far) */
446 
447  /* Row processor interface workspace */
448  PGdataValue *rowBuf; /* array for passing values to rowProcessor */
449  int rowBufLen; /* number of entries allocated in rowBuf */
450 
451  /* Status for asynchronous result construction */
452  PGresult *result; /* result being constructed */
453  PGresult *next_result; /* next result (used in single-row mode) */
454 
455  /* Buffer to hold incoming authentication request data */
458 
459  /* Assorted state for SASL, SSL, GSS, etc */
460  void *sasl_state;
461 
462 #ifdef USE_SSL
463  bool allow_ssl_try; /* Allowed to try SSL negotiation */
464  bool wait_ssl_try; /* Delay SSL negotiation until after
465  * attempting normal connection */
466  bool ssl_in_use;
467 #ifdef USE_OPENSSL
468  SSL *ssl; /* SSL status, if have SSL connection */
469  X509 *peer; /* X509 cert of server */
470 #ifdef USE_SSL_ENGINE
471  ENGINE *engine; /* SSL engine, if any */
472 #else
473  void *engine; /* dummy field to keep struct the same if
474  * OpenSSL version changes */
475 #endif
476 #endif /* USE_OPENSSL */
477 #endif /* USE_SSL */
478 
479 #ifdef ENABLE_GSS
480  gss_ctx_id_t gctx; /* GSS context */
481  gss_name_t gtarg_nam; /* GSS target name */
482  gss_buffer_desc ginbuf; /* GSS input token */
483  gss_buffer_desc goutbuf; /* GSS output token */
484 #endif
485 
486 #ifdef ENABLE_SSPI
487 #ifndef ENABLE_GSS
488  gss_buffer_desc ginbuf; /* GSS input token */
489 #else
490  char *gsslib; /* What GSS library to use ("gssapi" or
491  * "sspi") */
492 #endif
493  CredHandle *sspicred; /* SSPI credentials handle */
494  CtxtHandle *sspictx; /* SSPI context */
495  char *sspitarget; /* SSPI target name */
496  int usesspi; /* Indicate if SSPI is in use on the
497  * connection */
498 #endif
499 
500  /* Buffer for current error message */
501  PQExpBufferData errorMessage; /* expansible string */
502 
503  /* Buffer for receiving various parts of messages */
504  PQExpBufferData workBuffer; /* expansible string */
505 };
506 
507 /* PGcancel stores all data necessary to cancel a connection. A copy of this
508  * data is required to safely cancel a connection running on a different
509  * thread.
510  */
511 struct pg_cancel
512 {
513  SockAddr raddr; /* Remote address */
514  int be_pid; /* PID of backend --- needed for cancels */
515  int be_key; /* key of backend --- needed for cancels */
516 };
517 
518 
519 /* String descriptions of the ExecStatusTypes.
520  * direct use of this array is deprecated; call PQresStatus() instead.
521  */
522 extern char *const pgresStatus[];
523 
524 
525 #ifdef USE_SSL
526 
527 #ifndef WIN32
528 #define USER_CERT_FILE ".postgresql/postgresql.crt"
529 #define USER_KEY_FILE ".postgresql/postgresql.key"
530 #define ROOT_CERT_FILE ".postgresql/root.crt"
531 #define ROOT_CRL_FILE ".postgresql/root.crl"
532 #else
533 /* On Windows, the "home" directory is already PostgreSQL-specific */
534 #define USER_CERT_FILE "postgresql.crt"
535 #define USER_KEY_FILE "postgresql.key"
536 #define ROOT_CERT_FILE "root.crt"
537 #define ROOT_CRL_FILE "root.crl"
538 #endif
539 
540 #endif /* USE_SSL */
541 
542 /* ----------------
543  * Internal functions of libpq
544  * Functions declared here need to be visible across files of libpq,
545  * but are not intended to be called by applications. We use the
546  * convention "pqXXX" for internal functions, vs. the "PQxxx" names
547  * used for application-visible routines.
548  * ----------------
549  */
550 
551 /* === in fe-connect.c === */
552 
553 extern void pqDropConnection(PGconn *conn, bool flushInput);
554 extern int pqPacketSend(PGconn *conn, char pack_type,
555  const void *buf, size_t buf_len);
556 extern bool pqGetHomeDirectory(char *buf, int bufsize);
557 
558 #ifdef ENABLE_THREAD_SAFETY
560 
561 #define PGTHREAD_ERROR(msg) \
562  do { \
563  fprintf(stderr, "%s\n", msg); \
564  abort(); \
565  } while (0)
566 
567 
568 #define pglock_thread() pg_g_threadlock(true)
569 #define pgunlock_thread() pg_g_threadlock(false)
570 #else
571 #define pglock_thread() ((void) 0)
572 #define pgunlock_thread() ((void) 0)
573 #endif
574 
575 /* === in fe-exec.c === */
576 
577 extern void pqSetResultError(PGresult *res, const char *msg);
578 extern void pqCatenateResultError(PGresult *res, const char *msg);
579 extern void *pqResultAlloc(PGresult *res, size_t nBytes, bool isBinary);
580 extern char *pqResultStrdup(PGresult *res, const char *str);
581 extern void pqClearAsyncResult(PGconn *conn);
582 extern void pqSaveErrorResult(PGconn *conn);
584 extern void pqInternalNotice(const PGNoticeHooks *hooks, const char *fmt,...) pg_attribute_printf(2, 3);
585 extern void pqSaveMessageField(PGresult *res, char code,
586  const char *value);
587 extern void pqSaveParameterStatus(PGconn *conn, const char *name,
588  const char *value);
589 extern int pqRowProcessor(PGconn *conn, const char **errmsgp);
590 extern void pqHandleSendFailure(PGconn *conn);
591 
592 /* === in fe-protocol2.c === */
593 
595 
596 extern char *pqBuildStartupPacket2(PGconn *conn, int *packetlen,
598 extern void pqParseInput2(PGconn *conn);
599 extern int pqGetCopyData2(PGconn *conn, char **buffer, int async);
600 extern int pqGetline2(PGconn *conn, char *s, int maxlen);
601 extern int pqGetlineAsync2(PGconn *conn, char *buffer, int bufsize);
602 extern int pqEndcopy2(PGconn *conn);
603 extern PGresult *pqFunctionCall2(PGconn *conn, Oid fnid,
604  int *result_buf, int *actual_result_len,
605  int result_is_int,
606  const PQArgBlock *args, int nargs);
607 
608 /* === in fe-protocol3.c === */
609 
610 extern char *pqBuildStartupPacket3(PGconn *conn, int *packetlen,
611  const PQEnvironmentOption *options);
612 extern void pqParseInput3(PGconn *conn);
613 extern int pqGetErrorNotice3(PGconn *conn, bool isError);
614 extern void pqBuildErrorMessage3(PQExpBuffer msg, const PGresult *res,
615  PGVerbosity verbosity, PGContextVisibility show_context);
616 extern int pqGetCopyData3(PGconn *conn, char **buffer, int async);
617 extern int pqGetline3(PGconn *conn, char *s, int maxlen);
618 extern int pqGetlineAsync3(PGconn *conn, char *buffer, int bufsize);
619 extern int pqEndcopy3(PGconn *conn);
620 extern PGresult *pqFunctionCall3(PGconn *conn, Oid fnid,
621  int *result_buf, int *actual_result_len,
622  int result_is_int,
623  const PQArgBlock *args, int nargs);
624 
625 /* === in fe-misc.c === */
626 
627  /*
628  * "Get" and "Put" routines return 0 if successful, EOF if not. Note that for
629  * Get, EOF merely means the buffer is exhausted, not that there is
630  * necessarily any error.
631  */
632 extern int pqCheckOutBufferSpace(size_t bytes_needed, PGconn *conn);
633 extern int pqCheckInBufferSpace(size_t bytes_needed, PGconn *conn);
634 extern int pqGetc(char *result, PGconn *conn);
635 extern int pqPutc(char c, PGconn *conn);
636 extern int pqGets(PQExpBuffer buf, PGconn *conn);
637 extern int pqGets_append(PQExpBuffer buf, PGconn *conn);
638 extern int pqPuts(const char *s, PGconn *conn);
639 extern int pqGetnchar(char *s, size_t len, PGconn *conn);
640 extern int pqSkipnchar(size_t len, PGconn *conn);
641 extern int pqPutnchar(const char *s, size_t len, PGconn *conn);
642 extern int pqGetInt(int *result, size_t bytes, PGconn *conn);
643 extern int pqPutInt(int value, size_t bytes, PGconn *conn);
644 extern int pqPutMsgStart(char msg_type, bool force_len, PGconn *conn);
645 extern int pqPutMsgEnd(PGconn *conn);
646 extern int pqReadData(PGconn *conn);
647 extern int pqFlush(PGconn *conn);
648 extern int pqWait(int forRead, int forWrite, PGconn *conn);
649 extern int pqWaitTimed(int forRead, int forWrite, PGconn *conn,
650  time_t finish_time);
651 extern int pqReadReady(PGconn *conn);
652 extern int pqWriteReady(PGconn *conn);
653 
654 /* === in fe-secure.c === */
655 
656 extern int pqsecure_initialize(PGconn *);
657 extern void pqsecure_destroy(void);
659 extern void pqsecure_close(PGconn *);
660 extern ssize_t pqsecure_read(PGconn *, void *ptr, size_t len);
661 extern ssize_t pqsecure_write(PGconn *, const void *ptr, size_t len);
662 extern ssize_t pqsecure_raw_read(PGconn *, void *ptr, size_t len);
663 extern ssize_t pqsecure_raw_write(PGconn *, const void *ptr, size_t len);
664 
665 #if defined(ENABLE_THREAD_SAFETY) && !defined(WIN32)
666 extern int pq_block_sigpipe(sigset_t *osigset, bool *sigpipe_pending);
667 extern void pq_reset_sigpipe(sigset_t *osigset, bool sigpipe_pending,
668  bool got_epipe);
669 #endif
670 
671 /*
672  * The SSL implementation provides these functions (fe-secure-openssl.c)
673  */
674 extern void pgtls_init_library(bool do_ssl, int do_crypto);
675 extern int pgtls_init(PGconn *conn);
676 extern PostgresPollingStatusType pgtls_open_client(PGconn *conn);
677 extern void pgtls_close(PGconn *conn);
678 extern ssize_t pgtls_read(PGconn *conn, void *ptr, size_t len);
679 extern bool pgtls_read_pending(PGconn *conn);
680 extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
681 
682 /*
683  * this is so that we can check if a connection is non-blocking internally
684  * without the overhead of a function call
685  */
686 #define pqIsnonblocking(conn) ((conn)->nonblocking)
687 
688 #ifdef ENABLE_NLS
689 extern char *libpq_gettext(const char *msgid) pg_attribute_format_arg(1);
690 extern char *libpq_ngettext(const char *msgid, const char *msgid_plural, unsigned long n) pg_attribute_format_arg(1) pg_attribute_format_arg(2);
691 #else
692 #define libpq_gettext(x) (x)
693 #define libpq_ngettext(s, p, n) ((n) == 1 ? (s) : (p))
694 #endif
695 
696 /*
697  * These macros are needed to let error-handling code be portable between
698  * Unix and Windows. (ugh)
699  */
700 #ifdef WIN32
701 #define SOCK_ERRNO (WSAGetLastError())
702 #define SOCK_STRERROR winsock_strerror
703 #define SOCK_ERRNO_SET(e) WSASetLastError(e)
704 #else
705 #define SOCK_ERRNO errno
706 #define SOCK_STRERROR pqStrerror
707 #define SOCK_ERRNO_SET(e) (errno = (e))
708 #endif
709 
710 #endif /* LIBPQ_INT_H */
struct PGEvent PGEvent
struct pgDataValue PGdataValue
int pqPutInt(int value, size_t bytes, PGconn *conn)
Definition: fe-misc.c:312
PGContextVisibility show_context
Definition: libpq-int.h:427
bool sigpipe_flag
Definition: libpq-int.h:411
ConnStatusType
Definition: libpq-fe.h:47
int length(const List *list)
Definition: list.c:1271
void pgtls_close(PGconn *conn)
void(* PQnoticeProcessor)(void *arg, const char *message)
Definition: libpq-fe.h:172
int inEnd
Definition: libpq-int.h:435
int pqWait(int forRead, int forWrite, PGconn *conn)
Definition: fe-misc.c:989
PGMessageField * errFields
Definition: libpq-int.h:197
bool pgtls_read_pending(PGconn *conn)
int pqPacketSend(PGconn *conn, char pack_type, const void *buf, size_t buf_len)
Definition: fe-connect.c:3913
int inStart
Definition: libpq-int.h:433
ssize_t pgtls_read(PGconn *conn, void *ptr, size_t len)
char space[1]
Definition: libpq-int.h:106
int pqReadData(PGconn *conn)
Definition: fe-misc.c:634
char * pqBuildStartupPacket3(PGconn *conn, int *packetlen, const PQEnvironmentOption *options)
int be_pid
Definition: libpq-int.h:514
struct addrinfo * addr_cur
Definition: libpq-int.h:414
const char * envName
Definition: libpq-int.h:251
PGEvent * events
Definition: libpq-int.h:373
ssize_t pqsecure_write(PGconn *, const void *ptr, size_t len)
Definition: fe-secure.c:282
void pqSaveErrorResult(PGconn *conn)
Definition: fe-exec.c:728
bool singleRowMode
Definition: libpq-int.h:387
bool resultInitialized
Definition: libpq-int.h:164
int rowBufLen
Definition: libpq-int.h:449
Oid fn_lo_write
Definition: libpq-int.h:279
int eventArraySize
Definition: libpq-int.h:375
int pqGetline2(PGconn *conn, char *s, int maxlen)
char * replication
Definition: libpq-int.h:341
char * pgpassfile
Definition: libpq-int.h:344
bool sigpipe_so
Definition: libpq-int.h:410
int pqPutMsgEnd(PGconn *conn)
Definition: fe-misc.c:592
int pqRowProcessor(PGconn *conn, const char **errmsgp)
Definition: fe-exec.c:1030
bool password_needed
Definition: libpq-int.h:408
ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len)
char * pqResultStrdup(PGresult *res, const char *str)
Definition: fe-exec.c:602
PGQueryClass
Definition: libpq-int.h:225
int outCount
Definition: libpq-int.h:440
PQExpBufferData workBuffer
Definition: libpq-int.h:504
Oid fn_lo_create
Definition: libpq-int.h:270
int pqPutMsgStart(char msg_type, bool force_len, PGconn *conn)
Definition: fe-misc.c:524
PGAsyncStatusType
Definition: libpq-int.h:214
int tupArrSize
Definition: libpq-int.h:174
char * requirepeer
Definition: libpq-int.h:357
char * host
Definition: libpq-int.h:307
PGresult * pqFunctionCall2(PGconn *conn, Oid fnid, int *result_buf, int *actual_result_len, int result_is_int, const PQArgBlock *args, int nargs)
const char * value
Definition: libpq-int.h:290
PGresult_data * next
Definition: libpq-int.h:105
PGQueryClass queryclass
Definition: libpq-int.h:381
char copy_is_binary
Definition: libpq-int.h:388
PGnotify * notifyHead
Definition: libpq-int.h:391
Oid fn_lo_lseek
Definition: libpq-int.h:272
char * dbName
Definition: libpq-int.h:340
struct pgMessageField * next
Definition: libpq-int.h:144
return result
Definition: formatting.c:1618
int outMsgEnd
Definition: libpq-int.h:445
ExecStatusType
Definition: libpq-fe.h:82
int spaceLeft
Definition: libpq-int.h:210
void pqClearAsyncResult(PGconn *conn)
Definition: fe-exec.c:705
void pqsecure_close(PGconn *)
Definition: fe-secure.c:189
char * keepalives
Definition: libpq-int.h:345
void pgtls_init_library(bool do_ssl, int do_crypto)
bool pgpassfile_used
Definition: libpq-int.h:409
void(* pgthreadlock_t)(int acquire)
Definition: libpq-fe.h:374
void pqBuildErrorMessage3(PQExpBuffer msg, const PGresult *res, PGVerbosity verbosity, PGContextVisibility show_context)
Definition: fe-protocol3.c:982
int nEvents
Definition: libpq-int.h:188
unsigned int Oid
Definition: postgres_ext.h:31
PGresult * pqPrepareAsyncResult(PGconn *conn)
Definition: fe-exec.c:756
char * errMsg
Definition: libpq-int.h:196
#define CMDSTATUS_LEN
Definition: libpq-int.h:86
char * keepalives_idle
Definition: libpq-int.h:346
int pqGets_append(PQExpBuffer buf, PGconn *conn)
Definition: fe-misc.c:174
pg_conn_host_type type
Definition: libpq-int.h:308
char null_field[1]
Definition: libpq-int.h:201
PGresAttDesc * attDescs
Definition: libpq-int.h:171
FILE * Pfdebug
Definition: libpq-int.h:367
void pqParseInput3(PGconn *conn)
Definition: fe-protocol3.c:66
void * pqResultAlloc(PGresult *res, size_t nBytes, bool isBinary)
Definition: fe-exec.c:506
PGresult * result
Definition: libpq-int.h:452
#define pg_attribute_printf(f, a)
Definition: c.h:638
void pqInternalNotice(const PGNoticeHooks *hooks, const char *fmt,...) pg_attribute_printf(2
PGresAttValue ** tuples
Definition: libpq-int.h:172
PGresult * pqFunctionCall3(PGconn *conn, Oid fnid, int *result_buf, int *actual_result_len, int result_is_int, const PQArgBlock *args, int nargs)
char * client_encoding_initial
Definition: libpq-int.h:336
ssize_t pqsecure_read(PGconn *, void *ptr, size_t len)
Definition: fe-secure.c:205
int(* PGEventProc)(PGEventId evtId, void *evtInfo, void *passThrough)
Definition: libpq-events.h:69
int sversion
Definition: libpq-int.h:405
char * sslkey
Definition: libpq-int.h:353
static struct @114 value
void pqsecure_destroy(void)
PGresult * next_result
Definition: libpq-int.h:453
char * sslcompression
Definition: libpq-int.h:352
PGAsyncStatusType asyncStatus
Definition: libpq-int.h:379
int pqPutnchar(const char *s, size_t len, PGconn *conn)
Definition: fe-misc.c:251
char md5Salt[4]
Definition: libpq-int.h:422
int pqCheckInBufferSpace(size_t bytes_needed, PGconn *conn)
Definition: fe-misc.c:413
PGSetenvStatusType setenv_state
Definition: libpq-int.h:415
void pqSaveParameterStatus(PGconn *conn, const char *name, const char *value)
Definition: fe-exec.c:912
char * auth_req_inbuf
Definition: libpq-int.h:456
void(* PQnoticeReceiver)(void *arg, const PGresult *res)
Definition: libpq-fe.h:171
PGNoticeHooks noticeHooks
Definition: libpq-int.h:186
void * data
Definition: libpq-int.h:163
int pqsecure_initialize(PGconn *)
Definition: fe-secure.c:160
PGconn * conn
Definition: streamutil.c:42
Oid fn_lo_read
Definition: libpq-int.h:278
int inBufSize
Definition: libpq-int.h:432
Oid fn_lo_truncate
Definition: libpq-int.h:276
struct pgParameterStatus pgParameterStatus
PostgresPollingStatusType pgtls_open_client(PGconn *conn)
PGNoticeHooks noticeHooks
Definition: libpq-int.h:370
int curOffset
Definition: libpq-int.h:209
char * connect_timeout
Definition: libpq-int.h:335
int auth_req_inlen
Definition: libpq-int.h:457
pg_conn_host * connhost
Definition: libpq-int.h:397
void * noticeProcArg
Definition: libpq-int.h:155
void * sasl_state
Definition: libpq-int.h:460
char * keepalives_interval
Definition: libpq-int.h:347
#define libpq_ngettext(s, p, n)
Definition: libpq-int.h:693
char * c
PGVerbosity verbosity
Definition: libpq-int.h:426
const PQEnvironmentOption * next_eo
Definition: libpq-int.h:416
static char * buf
Definition: pg_test_fsync.c:65
Oid fn_lo_open
Definition: libpq-int.h:267
PQnoticeReceiver noticeRec
Definition: libpq-int.h:152
int pqGetInt(int *result, size_t bytes, PGconn *conn)
Definition: fe-misc.c:272
char * appname
Definition: libpq-int.h:338
PGresult_data * curBlock
Definition: libpq-int.h:208
int numParameters
Definition: libpq-int.h:175
int pgsocket
Definition: port.h:22
int pqGetlineAsync3(PGconn *conn, char *buffer, int bufsize)
char * target_session_attrs
Definition: libpq-int.h:363
char * last_query
Definition: libpq-int.h:382
Oid fn_lo_tell64
Definition: libpq-int.h:275
pgthreadlock_t pg_g_threadlock
Definition: fe-connect.c:394
PGdataValue * rowBuf
Definition: libpq-int.h:448
void pqHandleSendFailure(PGconn *conn)
Definition: fe-exec.c:1582
void void pqSaveMessageField(PGresult *res, char code, const char *value)
Definition: fe-exec.c:891
int binary
Definition: libpq-int.h:179
char * pguser
Definition: libpq-int.h:342
const char * pgName
Definition: libpq-int.h:251
#define pg_attribute_format_arg(a)
Definition: c.h:637
Oid fn_lo_truncate64
Definition: libpq-int.h:277
PGSetenvStatusType
Definition: libpq-int.h:235
int pqReadReady(PGconn *conn)
Definition: fe-misc.c:1028
pgsocket sock
Definition: libpq-int.h:400
int be_key
Definition: libpq-int.h:515
char * errQuery
Definition: libpq-int.h:198
void pqDropConnection(PGconn *conn, bool flushInput)
Definition: fe-connect.c:409
int numAttributes
Definition: libpq-int.h:170
uint32 ProtocolVersion
Definition: pqcomm.h:113
struct PQEnvironmentOption PQEnvironmentOption
struct pgresParamDesc PGresParamDesc
int pqGets(PQExpBuffer buf, PGconn *conn)
Definition: fe-misc.c:168
pg_conn_host_type
Definition: libpq-int.h:293
PostgresPollingStatusType pqSetenvPoll(PGconn *conn)
Definition: fe-protocol2.c:50
SockAddr raddr
Definition: libpq-int.h:403
ssize_t pqsecure_raw_read(PGconn *, void *ptr, size_t len)
Definition: fe-secure.c:224
pgParameterStatus * pstatus
Definition: libpq-int.h:423
PGContextVisibility
Definition: libpq-fe.h:117
char * inBuffer
Definition: libpq-int.h:431
int pqGetCopyData3(PGconn *conn, char **buffer, int async)
int pqPuts(const char *s, PGconn *conn)
Definition: fe-misc.c:184
char *const pgresStatus[]
Definition: fe-exec.c:32
char * sslmode
Definition: libpq-int.h:351
struct pgresAttValue PGresAttValue
int pqWriteReady(PGconn *conn)
Definition: fe-misc.c:1038
PGVerbosity
Definition: libpq-fe.h:110
PQnoticeProcessor noticeProc
Definition: libpq-int.h:154
int outMsgStart
Definition: libpq-int.h:443
PQExpBufferData errorMessage
Definition: libpq-int.h:501
void pqParseInput2(PGconn *conn)
Definition: fe-protocol2.c:411
bool std_strings
Definition: libpq-int.h:425
Oid fn_lo_tell
Definition: libpq-int.h:274
int pqGetnchar(char *s, size_t len, PGconn *conn)
Definition: fe-misc.c:200
char * sslcert
Definition: libpq-int.h:354
int pqWaitTimed(int forRead, int forWrite, PGconn *conn, time_t finish_time)
Definition: fe-misc.c:1004
bool options_valid
Definition: libpq-int.h:384
PGTransactionStatusType
Definition: libpq-fe.h:101
int outBufSize
Definition: libpq-int.h:439
PGresParamDesc * paramDescs
Definition: libpq-int.h:176
struct pg_conn_host pg_conn_host
int ntups
Definition: libpq-int.h:169
char * pgoptions
Definition: libpq-int.h:337
struct addrinfo * addrlist
Definition: libpq-int.h:314
int pqPutc(char c, PGconn *conn)
Definition: fe-misc.c:117
ssize_t pqsecure_raw_write(PGconn *, const void *ptr, size_t len)
Definition: fe-secure.c:301
WalTimeSample buffer[LAG_TRACKER_BUFFER_SIZE]
Definition: walsender.c:207
struct pgParameterStatus * next
Definition: libpq-int.h:258
int pqCheckOutBufferSpace(size_t bytes_needed, PGconn *conn)
Definition: fe-misc.c:349
char contents[FLEXIBLE_ARRAY_MEMBER]
Definition: libpq-int.h:146
char * pgpass
Definition: libpq-int.h:343
ProtocolVersion pversion
Definition: libpq-int.h:404
char * sslrootcert
Definition: libpq-int.h:355
char cmdStatus[CMDSTATUS_LEN]
Definition: libpq-int.h:178
PGEventProc proc
Definition: libpq-int.h:160
ConnStatusType status
Definition: libpq-int.h:378
bool auth_req_received
Definition: libpq-int.h:406
int be_key
Definition: libpq-int.h:421
Oid fn_lo_creat
Definition: libpq-int.h:269
PGnotify * notifyTail
Definition: libpq-int.h:392
int copy_already_done
Definition: libpq-int.h:389
Oid fn_lo_close
Definition: libpq-int.h:268
const char * name
Definition: encode.c:521
int pqFlush(PGconn *conn)
Definition: fe-misc.c:966
char * pqBuildStartupPacket2(PGconn *conn, int *packetlen, const PQEnvironmentOption *options)
SockAddr laddr
Definition: libpq-int.h:402
char * outBuffer
Definition: libpq-int.h:438
bool nonblocking
Definition: libpq-int.h:385
PostgresPollingStatusType
Definition: libpq-fe.h:72
PostgresPollingStatusType pqsecure_open_client(PGconn *)
Definition: fe-secure.c:175
char * pghostaddr
Definition: libpq-int.h:329
Oid fn_lo_lseek64
Definition: libpq-int.h:273
struct pgLobjfuncs PGlobjfuncs
int pqGetCopyData2(PGconn *conn, char **buffer, int async)
int pqEndcopy2(PGconn *conn)
int pqGetlineAsync2(PGconn *conn, char *buffer, int bufsize)
int nEvents
Definition: libpq-int.h:374
int pqGetc(char *result, PGconn *conn)
Definition: fe-misc.c:99
void * passThrough
Definition: libpq-int.h:162
char * fbappname
Definition: libpq-int.h:339
int client_encoding
Definition: libpq-int.h:424
Oid fn_lo_unlink
Definition: libpq-int.h:271
char * value
Definition: libpq-int.h:138
void pqCatenateResultError(PGresult *res, const char *msg)
Definition: fe-exec.c:631
SockAddr raddr
Definition: libpq-int.h:513
bool pqGetHomeDirectory(char *buf, int bufsize)
Definition: fe-connect.c:6430
PGEvent * events
Definition: libpq-int.h:187
int inCursor
Definition: libpq-int.h:434
int pqSkipnchar(size_t len, PGconn *conn)
Definition: fe-misc.c:229
char * port
Definition: libpq-int.h:309
char * pgport
Definition: libpq-int.h:332
int pqEndcopy3(PGconn *conn)
int pqGetErrorNotice3(PGconn *conn, bool isError)
Definition: fe-protocol3.c:876
int be_pid
Definition: libpq-int.h:420
int nconnhost
Definition: libpq-int.h:395
char * name
Definition: libpq-int.h:161
ExecStatusType resultStatus
Definition: libpq-int.h:177
PGlobjfuncs * lobjfuncs
Definition: libpq-int.h:428
int pgtls_init(PGconn *conn)
char * sslcrl
Definition: libpq-int.h:356
void pqSetResultError(PGresult *res, const char *msg)
Definition: fe-exec.c:616
int whichhost
Definition: libpq-int.h:396
struct pgMessageField PGMessageField
#define libpq_gettext(x)
Definition: libpq-int.h:692
int pqGetline3(PGconn *conn, char *s, int maxlen)
bool send_appname
Definition: libpq-int.h:417
PGTransactionStatusType xactStatus
Definition: libpq-int.h:380
char * keepalives_count
Definition: libpq-int.h:349
char * pghost
Definition: libpq-int.h:324
char * pgtty
Definition: libpq-int.h:333
void * noticeRecArg
Definition: libpq-int.h:153
int client_encoding
Definition: libpq-int.h:189
char last_sqlstate[6]
Definition: libpq-int.h:383
char * password
Definition: libpq-int.h:311