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1 : : /*-------------------------------------------------------------------------
2 : : *
3 : : * postinit.c
4 : : * postgres initialization utilities
5 : : *
6 : : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
7 : : * Portions Copyright (c) 1994, Regents of the University of California
8 : : *
9 : : *
10 : : * IDENTIFICATION
11 : : * src/backend/utils/init/postinit.c
12 : : *
13 : : *
14 : : *-------------------------------------------------------------------------
15 : : */
16 : : #include "postgres.h"
17 : :
18 : : #include <ctype.h>
19 : : #include <fcntl.h>
20 : : #include <unistd.h>
21 : :
22 : : #include "access/genam.h"
23 : : #include "access/heapam.h"
24 : : #include "access/htup_details.h"
25 : : #include "access/session.h"
26 : : #include "access/tableam.h"
27 : : #include "access/xact.h"
28 : : #include "access/xlog.h"
29 : : #include "access/xloginsert.h"
30 : : #include "catalog/namespace.h"
31 : : #include "catalog/pg_authid.h"
32 : : #include "catalog/pg_collation.h"
33 : : #include "catalog/pg_database.h"
34 : : #include "catalog/pg_db_role_setting.h"
35 : : #include "catalog/pg_tablespace.h"
36 : : #include "libpq/auth.h"
37 : : #include "libpq/libpq-be.h"
38 : : #include "mb/pg_wchar.h"
39 : : #include "miscadmin.h"
40 : : #include "pgstat.h"
41 : : #include "port/pg_bitutils.h"
42 : : #include "postmaster/autovacuum.h"
43 : : #include "postmaster/postmaster.h"
44 : : #include "replication/slot.h"
45 : : #include "replication/slotsync.h"
46 : : #include "replication/walsender.h"
47 : : #include "storage/aio_subsys.h"
48 : : #include "storage/bufmgr.h"
49 : : #include "storage/fd.h"
50 : : #include "storage/ipc.h"
51 : : #include "storage/lmgr.h"
52 : : #include "storage/proc.h"
53 : : #include "storage/procarray.h"
54 : : #include "storage/procnumber.h"
55 : : #include "storage/procsignal.h"
56 : : #include "storage/sinvaladt.h"
57 : : #include "storage/smgr.h"
58 : : #include "storage/sync.h"
59 : : #include "tcop/backend_startup.h"
60 : : #include "tcop/tcopprot.h"
61 : : #include "utils/acl.h"
62 : : #include "utils/builtins.h"
63 : : #include "utils/fmgroids.h"
64 : : #include "utils/guc_hooks.h"
65 : : #include "utils/injection_point.h"
66 : : #include "utils/memutils.h"
67 : : #include "utils/pg_locale.h"
68 : : #include "utils/portal.h"
69 : : #include "utils/ps_status.h"
70 : : #include "utils/snapmgr.h"
71 : : #include "utils/syscache.h"
72 : : #include "utils/timeout.h"
73 : :
74 : : /* has this backend called EmitConnectionWarnings()? */
75 : : static bool ConnectionWarningsEmitted;
76 : :
77 : : typedef struct ConnectionWarning
78 : : {
79 : : char *message;
80 : : char *detail;
81 : : ConnectionWarningFilter filter;
82 : : } ConnectionWarning;
83 : :
84 : : /* warnings to send via EmitConnectionWarnings() */
85 : : static List *ConnectionWarnings;
86 : :
87 : : static HeapTuple GetDatabaseTuple(const char *dbname);
88 : : static HeapTuple GetDatabaseTupleByOid(Oid dboid);
89 : : static void PerformAuthentication(Port *port);
90 : : static void CheckMyDatabase(const char *name, bool am_superuser, bool override_allow_connections);
91 : : static void ShutdownPostgres(int code, Datum arg);
92 : : static void StatementTimeoutHandler(void);
93 : : static void LockTimeoutHandler(void);
94 : : static void IdleInTransactionSessionTimeoutHandler(void);
95 : : static void TransactionTimeoutHandler(void);
96 : : static void IdleSessionTimeoutHandler(void);
97 : : static void IdleStatsUpdateTimeoutHandler(void);
98 : : static void ClientCheckTimeoutHandler(void);
99 : : static bool ThereIsAtLeastOneRole(void);
100 : : static void process_startup_options(Port *port, bool am_superuser);
101 : : static void process_settings(Oid databaseid, Oid roleid);
102 : : static void EmitConnectionWarnings(void);
103 : :
104 : :
105 : : /*** InitPostgres support ***/
106 : :
107 : :
108 : : /*
109 : : * GetDatabaseTuple -- fetch the pg_database row for a database
110 : : *
111 : : * This is used during backend startup when we don't yet have any access to
112 : : * system catalogs in general. In the worst case, we can seqscan pg_database
113 : : * using nothing but the hard-wired descriptor that relcache.c creates for
114 : : * pg_database. In more typical cases, relcache.c was able to load
115 : : * descriptors for both pg_database and its indexes from the shared relcache
116 : : * cache file, and so we can do an indexscan. criticalSharedRelcachesBuilt
117 : : * tells whether we got the cached descriptors.
118 : : */
119 : : static HeapTuple
120 : 14932 : GetDatabaseTuple(const char *dbname)
121 : : {
122 : : HeapTuple tuple;
123 : : Relation relation;
124 : : SysScanDesc scan;
125 : : ScanKeyData key[1];
126 : :
127 : : /*
128 : : * form a scan key
129 : : */
130 : 14932 : ScanKeyInit(&key[0],
131 : : Anum_pg_database_datname,
132 : : BTEqualStrategyNumber, F_NAMEEQ,
133 : : CStringGetDatum(dbname));
134 : :
135 : : /*
136 : : * Open pg_database and fetch a tuple. Force heap scan if we haven't yet
137 : : * built the critical shared relcache entries (i.e., we're starting up
138 : : * without a shared relcache cache file).
139 : : */
140 : 14932 : relation = table_open(DatabaseRelationId, AccessShareLock);
141 : 14932 : scan = systable_beginscan(relation, DatabaseNameIndexId,
142 : : criticalSharedRelcachesBuilt,
143 : : NULL,
144 : : 1, key);
145 : :
146 : 14932 : tuple = systable_getnext(scan);
147 : :
148 : : /* Must copy tuple before releasing buffer */
149 [ + + ]: 14932 : if (HeapTupleIsValid(tuple))
150 : 14923 : tuple = heap_copytuple(tuple);
151 : :
152 : : /* all done */
153 : 14932 : systable_endscan(scan);
154 : 14932 : table_close(relation, AccessShareLock);
155 : :
156 : 14932 : return tuple;
157 : : }
158 : :
159 : : /*
160 : : * GetDatabaseTupleByOid -- as above, but search by database OID
161 : : */
162 : : static HeapTuple
163 : 19218 : GetDatabaseTupleByOid(Oid dboid)
164 : : {
165 : : HeapTuple tuple;
166 : : Relation relation;
167 : : SysScanDesc scan;
168 : : ScanKeyData key[1];
169 : :
170 : : /*
171 : : * form a scan key
172 : : */
173 : 19218 : ScanKeyInit(&key[0],
174 : : Anum_pg_database_oid,
175 : : BTEqualStrategyNumber, F_OIDEQ,
176 : : ObjectIdGetDatum(dboid));
177 : :
178 : : /*
179 : : * Open pg_database and fetch a tuple. Force heap scan if we haven't yet
180 : : * built the critical shared relcache entries (i.e., we're starting up
181 : : * without a shared relcache cache file).
182 : : */
183 : 19218 : relation = table_open(DatabaseRelationId, AccessShareLock);
184 : 19218 : scan = systable_beginscan(relation, DatabaseOidIndexId,
185 : : criticalSharedRelcachesBuilt,
186 : : NULL,
187 : : 1, key);
188 : :
189 : 19218 : tuple = systable_getnext(scan);
190 : :
191 : : /* Must copy tuple before releasing buffer */
192 [ + + ]: 19218 : if (HeapTupleIsValid(tuple))
193 : 19217 : tuple = heap_copytuple(tuple);
194 : :
195 : : /* all done */
196 : 19218 : systable_endscan(scan);
197 : 19218 : table_close(relation, AccessShareLock);
198 : :
199 : 19218 : return tuple;
200 : : }
201 : :
202 : :
203 : : /*
204 : : * PerformAuthentication -- authenticate a remote client
205 : : *
206 : : * returns: nothing. Will not return at all if there's any failure.
207 : : */
208 : : static void
209 : 15466 : PerformAuthentication(Port *port)
210 : : {
211 : : /* This should be set already, but let's make sure */
212 : 15466 : ClientAuthInProgress = true; /* limit visibility of log messages */
213 : :
214 : : /*
215 : : * In EXEC_BACKEND case, we didn't inherit the contents of pg_hba.conf
216 : : * etcetera from the postmaster, and have to load them ourselves.
217 : : *
218 : : * FIXME: [fork/exec] Ugh. Is there a way around this overhead?
219 : : */
220 : : #ifdef EXEC_BACKEND
221 : :
222 : : /*
223 : : * load_hba() and load_ident() want to work within the PostmasterContext,
224 : : * so create that if it doesn't exist (which it won't). We'll delete it
225 : : * again later, in PostgresMain.
226 : : */
227 : : if (PostmasterContext == NULL)
228 : : PostmasterContext = AllocSetContextCreate(TopMemoryContext,
229 : : "Postmaster",
230 : : ALLOCSET_DEFAULT_SIZES);
231 : :
232 : : if (!load_hba())
233 : : {
234 : : /*
235 : : * It makes no sense to continue if we fail to load the HBA file,
236 : : * since there is no way to connect to the database in this case.
237 : : */
238 : : ereport(FATAL,
239 : : /* translator: %s is a configuration file */
240 : : (errmsg("could not load %s", HbaFileName)));
241 : : }
242 : :
243 : : if (!load_ident())
244 : : {
245 : : /*
246 : : * It is ok to continue if we fail to load the IDENT file, although it
247 : : * means that you cannot log in using any of the authentication
248 : : * methods that need a user name mapping. load_ident() already logged
249 : : * the details of error to the log.
250 : : */
251 : : }
252 : : #endif
253 : :
254 : : /* Capture authentication start time for logging */
255 : 15466 : conn_timing.auth_start = GetCurrentTimestamp();
256 : :
257 : : /*
258 : : * Set up a timeout in case a buggy or malicious client fails to respond
259 : : * during authentication. Since we're inside a transaction and might do
260 : : * database access, we have to use the statement_timeout infrastructure.
261 : : */
262 : 15466 : enable_timeout_after(STATEMENT_TIMEOUT, AuthenticationTimeout * 1000);
263 : :
264 : : /*
265 : : * Now perform authentication exchange.
266 : : */
267 : 15466 : set_ps_display("authentication");
268 : 15466 : ClientAuthentication(port); /* might not return, if failure */
269 : :
270 : : /*
271 : : * Done with authentication. Disable the timeout, and log if needed.
272 : : */
273 : 15392 : disable_timeout(STATEMENT_TIMEOUT, false);
274 : :
275 : : /* Capture authentication end time for logging */
276 : 15392 : conn_timing.auth_end = GetCurrentTimestamp();
277 : :
278 [ + + ]: 15392 : if (log_connections & LOG_CONNECTION_AUTHORIZATION)
279 : : {
280 : : StringInfoData logmsg;
281 : :
282 : 247 : initStringInfo(&logmsg);
283 [ - + ]: 247 : if (am_walsender)
284 : 0 : appendStringInfo(&logmsg, _("replication connection authorized: user=%s"),
285 : : port->user_name);
286 : : else
287 : 247 : appendStringInfo(&logmsg, _("connection authorized: user=%s"),
288 : : port->user_name);
289 [ + - ]: 247 : if (!am_walsender)
290 : 247 : appendStringInfo(&logmsg, _(" database=%s"), port->database_name);
291 : :
292 [ + - ]: 247 : if (port->application_name != NULL)
293 : 247 : appendStringInfo(&logmsg, _(" application_name=%s"),
294 : : port->application_name);
295 : :
296 : : #ifdef USE_SSL
297 [ + + ]: 247 : if (port->ssl_in_use)
298 : 111 : appendStringInfo(&logmsg, _(" SSL enabled (protocol=%s, cipher=%s, bits=%d)"),
299 : : be_tls_get_version(port),
300 : : be_tls_get_cipher(port),
301 : : be_tls_get_cipher_bits(port));
302 : : #endif
303 : : #ifdef ENABLE_GSS
304 : : if (port->gss)
305 : : {
306 : : const char *princ = be_gssapi_get_princ(port);
307 : :
308 : : if (princ)
309 : : appendStringInfo(&logmsg,
310 : : _(" GSS (authenticated=%s, encrypted=%s, delegated_credentials=%s, principal=%s)"),
311 : : be_gssapi_get_auth(port) ? _("yes") : _("no"),
312 : : be_gssapi_get_enc(port) ? _("yes") : _("no"),
313 : : be_gssapi_get_delegation(port) ? _("yes") : _("no"),
314 : : princ);
315 : : else
316 : : appendStringInfo(&logmsg,
317 : : _(" GSS (authenticated=%s, encrypted=%s, delegated_credentials=%s)"),
318 : : be_gssapi_get_auth(port) ? _("yes") : _("no"),
319 : : be_gssapi_get_enc(port) ? _("yes") : _("no"),
320 : : be_gssapi_get_delegation(port) ? _("yes") : _("no"));
321 : : }
322 : : #endif
323 : :
324 [ + - ]: 247 : ereport(LOG, errmsg_internal("%s", logmsg.data));
325 : 247 : pfree(logmsg.data);
326 : : }
327 : :
328 : 15392 : set_ps_display("startup");
329 : :
330 : 15392 : ClientAuthInProgress = false; /* client_min_messages is active now */
331 : 15392 : }
332 : :
333 : :
334 : : /*
335 : : * CheckMyDatabase -- fetch information from the pg_database entry for our DB
336 : : */
337 : : static void
338 : 19210 : CheckMyDatabase(const char *name, bool am_superuser, bool override_allow_connections)
339 : : {
340 : : HeapTuple tup;
341 : : Form_pg_database dbform;
342 : : Datum datum;
343 : : bool isnull;
344 : : char *collate;
345 : : char *ctype;
346 : :
347 : : /* Fetch our pg_database row normally, via syscache */
348 : 19210 : tup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
349 [ - + ]: 19210 : if (!HeapTupleIsValid(tup))
350 [ # # ]: 0 : elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
351 : 19210 : dbform = (Form_pg_database) GETSTRUCT(tup);
352 : :
353 : : /* This recheck is strictly paranoia */
354 [ - + ]: 19210 : if (strcmp(name, NameStr(dbform->datname)) != 0)
355 [ # # ]: 0 : ereport(FATAL,
356 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
357 : : errmsg("database \"%s\" has disappeared from pg_database",
358 : : name),
359 : : errdetail("Database OID %u now seems to belong to \"%s\".",
360 : : MyDatabaseId, NameStr(dbform->datname))));
361 : :
362 : : /*
363 : : * Check permissions to connect to the database.
364 : : *
365 : : * These checks are not enforced when in standalone mode, so that there is
366 : : * a way to recover from disabling all access to all databases, for
367 : : * example "UPDATE pg_database SET datallowconn = false;".
368 : : */
369 [ + + ]: 19210 : if (IsUnderPostmaster)
370 : : {
371 : : /*
372 : : * Check that the database is currently allowing connections.
373 : : * (Background processes can override this test and the next one by
374 : : * setting override_allow_connections.)
375 : : */
376 [ + + + + ]: 19134 : if (!dbform->datallowconn && !override_allow_connections)
377 [ + - ]: 1 : ereport(FATAL,
378 : : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
379 : : errmsg("database \"%s\" is not currently accepting connections",
380 : : name)));
381 : :
382 : : /*
383 : : * Check privilege to connect to the database. (The am_superuser test
384 : : * is redundant, but since we have the flag, might as well check it
385 : : * and save a few cycles.)
386 : : */
387 [ + + + + : 19456 : if (!am_superuser && !override_allow_connections &&
- + ]
388 : 323 : object_aclcheck(DatabaseRelationId, MyDatabaseId, GetUserId(),
389 : : ACL_CONNECT) != ACLCHECK_OK)
390 [ # # ]: 0 : ereport(FATAL,
391 : : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
392 : : errmsg("permission denied for database \"%s\"", name),
393 : : errdetail("User does not have CONNECT privilege.")));
394 : :
395 : : /*
396 : : * Check connection limit for this database. We enforce the limit
397 : : * only for regular backends, since other process types have their own
398 : : * PGPROC pools.
399 : : *
400 : : * There is a race condition here --- we create our PGPROC before
401 : : * checking for other PGPROCs. If two backends did this at about the
402 : : * same time, they might both think they were over the limit, while
403 : : * ideally one should succeed and one fail. Getting that to work
404 : : * exactly seems more trouble than it is worth, however; instead we
405 : : * just document that the connection limit is approximate.
406 : : */
407 [ - + ]: 19133 : if (dbform->datconnlimit >= 0 &&
408 [ # # ]: 0 : AmRegularBackendProcess() &&
409 [ # # ]: 0 : !am_superuser &&
410 [ # # ]: 0 : CountDBConnections(MyDatabaseId) > dbform->datconnlimit)
411 [ # # ]: 0 : ereport(FATAL,
412 : : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
413 : : errmsg("too many connections for database \"%s\"",
414 : : name)));
415 : : }
416 : :
417 : : /*
418 : : * OK, we're golden. Next to-do item is to save the encoding info out of
419 : : * the pg_database tuple.
420 : : */
421 : 19209 : SetDatabaseEncoding(dbform->encoding);
422 : : /* Record it as a GUC internal option, too */
423 : 19209 : SetConfigOption("server_encoding", GetDatabaseEncodingName(),
424 : : PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
425 : : /* If we have no other source of client_encoding, use server encoding */
426 : 19209 : SetConfigOption("client_encoding", GetDatabaseEncodingName(),
427 : : PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
428 : :
429 : : /* assign locale variables */
430 : 19209 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datcollate);
431 : 19209 : collate = TextDatumGetCString(datum);
432 : 19209 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datctype);
433 : 19209 : ctype = TextDatumGetCString(datum);
434 : :
435 [ - + ]: 19209 : if (pg_perm_setlocale(LC_COLLATE, collate) == NULL)
436 [ # # ]: 0 : ereport(FATAL,
437 : : (errmsg("database locale is incompatible with operating system"),
438 : : errdetail("The database was initialized with LC_COLLATE \"%s\", "
439 : : " which is not recognized by setlocale().", collate),
440 : : errhint("Recreate the database with another locale or install the missing locale.")));
441 : :
442 [ - + ]: 19209 : if (pg_perm_setlocale(LC_CTYPE, ctype) == NULL)
443 [ # # ]: 0 : ereport(FATAL,
444 : : (errmsg("database locale is incompatible with operating system"),
445 : : errdetail("The database was initialized with LC_CTYPE \"%s\", "
446 : : " which is not recognized by setlocale().", ctype),
447 : : errhint("Recreate the database with another locale or install the missing locale.")));
448 : :
449 : 19209 : init_database_collation();
450 : :
451 : : /*
452 : : * Check collation version. See similar code in
453 : : * pg_newlocale_from_collation(). Note that here we warn instead of error
454 : : * in any case, so that we don't prevent connecting.
455 : : */
456 : 19207 : datum = SysCacheGetAttr(DATABASEOID, tup, Anum_pg_database_datcollversion,
457 : : &isnull);
458 [ + + ]: 19207 : if (!isnull)
459 : : {
460 : : char *actual_versionstr;
461 : : char *collversionstr;
462 : : char *locale;
463 : :
464 : 18357 : collversionstr = TextDatumGetCString(datum);
465 : :
466 [ + + ]: 18357 : if (dbform->datlocprovider == COLLPROVIDER_LIBC)
467 : 17399 : locale = collate;
468 : : else
469 : : {
470 : 958 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datlocale);
471 : 958 : locale = TextDatumGetCString(datum);
472 : : }
473 : :
474 : 18357 : actual_versionstr = get_collation_actual_version(dbform->datlocprovider, locale);
475 [ - + ]: 18357 : if (!actual_versionstr)
476 : : /* should not happen */
477 [ # # ]: 0 : elog(WARNING,
478 : : "database \"%s\" has no actual collation version, but a version was recorded",
479 : : name);
480 [ - + ]: 18357 : else if (strcmp(actual_versionstr, collversionstr) != 0)
481 [ # # ]: 0 : ereport(WARNING,
482 : : (errmsg("database \"%s\" has a collation version mismatch",
483 : : name),
484 : : errdetail("The database was created using collation version %s, "
485 : : "but the operating system provides version %s.",
486 : : collversionstr, actual_versionstr),
487 : : errhint("Rebuild all objects in this database that use the default collation and run "
488 : : "ALTER DATABASE %s REFRESH COLLATION VERSION, "
489 : : "or build PostgreSQL with the right library version.",
490 : : quote_identifier(name))));
491 : : }
492 : :
493 : 19207 : ReleaseSysCache(tup);
494 : 19207 : }
495 : :
496 : :
497 : : /*
498 : : * pg_split_opts -- split a string of options and append it to an argv array
499 : : *
500 : : * The caller is responsible for ensuring the argv array is large enough. The
501 : : * maximum possible number of arguments added by this routine is
502 : : * (strlen(optstr) + 1) / 2.
503 : : *
504 : : * Because some option values can contain spaces we allow escaping using
505 : : * backslashes, with \\ representing a literal backslash.
506 : : */
507 : : void
508 : 4499 : pg_split_opts(char **argv, int *argcp, const char *optstr)
509 : : {
510 : : StringInfoData s;
511 : :
512 : 4499 : initStringInfo(&s);
513 : :
514 [ + + ]: 16453 : while (*optstr)
515 : : {
516 : 11954 : bool last_was_escape = false;
517 : :
518 : 11954 : resetStringInfo(&s);
519 : :
520 : : /* skip over leading space */
521 [ + + ]: 22834 : while (isspace((unsigned char) *optstr))
522 : 10880 : optstr++;
523 : :
524 [ - + ]: 11954 : if (*optstr == '\0')
525 : 0 : break;
526 : :
527 : : /*
528 : : * Parse a single option, stopping at the first space, unless it's
529 : : * escaped.
530 : : */
531 [ + + ]: 182904 : while (*optstr)
532 : : {
533 [ + + + + ]: 178405 : if (isspace((unsigned char) *optstr) && !last_was_escape)
534 : 7455 : break;
535 : :
536 [ + + + + ]: 170950 : if (!last_was_escape && *optstr == '\\')
537 : 20 : last_was_escape = true;
538 : : else
539 : : {
540 : 170930 : last_was_escape = false;
541 : 170930 : appendStringInfoChar(&s, *optstr);
542 : : }
543 : :
544 : 170950 : optstr++;
545 : : }
546 : :
547 : : /* now store the option in the next argv[] position */
548 : 11954 : argv[(*argcp)++] = pstrdup(s.data);
549 : : }
550 : :
551 : 4499 : pfree(s.data);
552 : 4499 : }
553 : :
554 : : /*
555 : : * Initialize MaxBackends value from config options.
556 : : *
557 : : * This must be called after modules have had the chance to alter GUCs in
558 : : * shared_preload_libraries and before shared memory size is determined.
559 : : *
560 : : * Note that in EXEC_BACKEND environment, the value is passed down from
561 : : * postmaster to subprocesses via BackendParameters in SubPostmasterMain; only
562 : : * postmaster itself and processes not under postmaster control should call
563 : : * this.
564 : : */
565 : : void
566 : 1279 : InitializeMaxBackends(void)
567 : : {
568 : : Assert(MaxBackends == 0);
569 : :
570 : : /* Note that this does not include "auxiliary" processes */
571 : 1279 : MaxBackends = MaxConnections + autovacuum_worker_slots +
572 : 1279 : max_worker_processes + max_wal_senders + NUM_SPECIAL_WORKER_PROCS;
573 : :
574 [ - + ]: 1279 : if (MaxBackends > MAX_BACKENDS)
575 [ # # ]: 0 : ereport(ERROR,
576 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
577 : : errmsg("too many server processes configured"),
578 : : errdetail("\"max_connections\" (%d) plus \"autovacuum_worker_slots\" (%d) plus \"max_worker_processes\" (%d) plus \"max_wal_senders\" (%d) must be less than %d.",
579 : : MaxConnections, autovacuum_worker_slots,
580 : : max_worker_processes, max_wal_senders,
581 : : MAX_BACKENDS - (NUM_SPECIAL_WORKER_PROCS - 1))));
582 : 1279 : }
583 : :
584 : : /*
585 : : * Initialize the number of fast-path lock slots in PGPROC.
586 : : *
587 : : * This must be called after modules have had the chance to alter GUCs in
588 : : * shared_preload_libraries and before shared memory size is determined.
589 : : */
590 : : void
591 : 1279 : InitializeFastPathLocks(void)
592 : : {
593 : : /* Should be initialized only once. */
594 : : Assert(FastPathLockGroupsPerBackend == 0);
595 : :
596 : : /*
597 : : * Based on the max_locks_per_transaction GUC, as that's a good indicator
598 : : * of the expected number of locks, figure out the value for
599 : : * FastPathLockGroupsPerBackend. This must be a power-of-two. We cap the
600 : : * value at FP_LOCK_GROUPS_PER_BACKEND_MAX and insist the value is at
601 : : * least 1.
602 : : *
603 : : * The default max_locks_per_transaction = 128 means 8 groups by default.
604 : : */
605 : 1279 : FastPathLockGroupsPerBackend =
606 [ + - + - : 1279 : Max(Min(pg_nextpower2_32(max_locks_per_xact) / FP_LOCK_SLOTS_PER_GROUP,
+ - ]
607 : : FP_LOCK_GROUPS_PER_BACKEND_MAX), 1);
608 : :
609 : : /* Validate we did get a power-of-two */
610 : : Assert(FastPathLockGroupsPerBackend ==
611 : : pg_nextpower2_32(FastPathLockGroupsPerBackend));
612 : 1279 : }
613 : :
614 : : /*
615 : : * Early initialization of a backend (either standalone or under postmaster).
616 : : * This happens even before InitPostgres.
617 : : *
618 : : * This is separate from InitPostgres because it is also called by auxiliary
619 : : * processes, such as the background writer process, which may not call
620 : : * InitPostgres at all.
621 : : */
622 : : void
623 : 25512 : BaseInit(void)
624 : : {
625 : : Assert(MyProc != NULL);
626 : :
627 : : /*
628 : : * Initialize our input/output/debugging file descriptors.
629 : : */
630 : 25512 : DebugFileOpen();
631 : :
632 : : /*
633 : : * Initialize file access. Done early so other subsystems can access
634 : : * files.
635 : : */
636 : 25512 : InitFileAccess();
637 : :
638 : : /*
639 : : * Initialize statistics reporting. This needs to happen early to ensure
640 : : * that pgstat's shutdown callback runs after the shutdown callbacks of
641 : : * all subsystems that can produce stats (like e.g. transaction commits
642 : : * can).
643 : : */
644 : 25512 : pgstat_initialize();
645 : :
646 : : /*
647 : : * Initialize AIO before infrastructure that might need to actually
648 : : * execute AIO.
649 : : */
650 : 25512 : pgaio_init_backend();
651 : :
652 : : /* Do local initialization of storage and buffer managers */
653 : 25512 : InitSync();
654 : 25512 : smgrinit();
655 : 25512 : InitBufferManagerAccess();
656 : :
657 : : /*
658 : : * Initialize temporary file access after pgstat, so that the temporary
659 : : * file shutdown hook can report temporary file statistics.
660 : : */
661 : 25512 : InitTemporaryFileAccess();
662 : :
663 : : /*
664 : : * Initialize local buffers for WAL record construction, in case we ever
665 : : * try to insert XLOG.
666 : : */
667 : 25512 : InitXLogInsert();
668 : :
669 : : /* Initialize lock manager's local structs */
670 : 25512 : InitLockManagerAccess();
671 : :
672 : : /*
673 : : * Initialize replication slots after pgstat. The exit hook might need to
674 : : * drop ephemeral slots, which in turn triggers stats reporting.
675 : : */
676 : 25512 : ReplicationSlotInitialize();
677 : 25512 : }
678 : :
679 : :
680 : : /* --------------------------------
681 : : * InitPostgres
682 : : * Initialize POSTGRES.
683 : : *
684 : : * Parameters:
685 : : * in_dbname, dboid: specify database to connect to, as described below
686 : : * username, useroid: specify role to connect as, as described below
687 : : * flags:
688 : : * - INIT_PG_LOAD_SESSION_LIBS to honor [session|local]_preload_libraries.
689 : : * - INIT_PG_OVERRIDE_ALLOW_CONNS to connect despite !datallowconn.
690 : : * - INIT_PG_OVERRIDE_ROLE_LOGIN to connect despite !rolcanlogin.
691 : : * out_dbname: optional output parameter, see below; pass NULL if not used
692 : : *
693 : : * The database can be specified by name, using the in_dbname parameter, or by
694 : : * OID, using the dboid parameter. Specify NULL or InvalidOid respectively
695 : : * for the unused parameter. If dboid is provided, the actual database
696 : : * name can be returned to the caller in out_dbname. If out_dbname isn't
697 : : * NULL, it must point to a buffer of size NAMEDATALEN.
698 : : *
699 : : * Similarly, the role can be passed by name, using the username parameter,
700 : : * or by OID using the useroid parameter.
701 : : *
702 : : * In bootstrap mode the database and username parameters are NULL/InvalidOid.
703 : : * The autovacuum launcher process doesn't specify these parameters either,
704 : : * because it only goes far enough to be able to read pg_database; it doesn't
705 : : * connect to any particular database. An autovacuum worker specifies a
706 : : * database but not a username; conversely, a physical walsender specifies
707 : : * username but not database.
708 : : *
709 : : * By convention, INIT_PG_LOAD_SESSION_LIBS should be passed in "flags" in
710 : : * "interactive" sessions (including standalone backends), but not in
711 : : * background processes such as autovacuum. Note in particular that it
712 : : * shouldn't be true in parallel worker processes; those have another
713 : : * mechanism for replicating their leader's set of loaded libraries.
714 : : *
715 : : * We expect that InitProcess() was already called, so we already have a
716 : : * PGPROC struct ... but it's not completely filled in yet.
717 : : *
718 : : * Note:
719 : : * Be very careful with the order of calls in the InitPostgres function.
720 : : * --------------------------------
721 : : */
722 : : void
723 : 20949 : InitPostgres(const char *in_dbname, Oid dboid,
724 : : const char *username, Oid useroid,
725 : : uint32 flags,
726 : : char *out_dbname)
727 : : {
728 : 20949 : bool bootstrap = IsBootstrapProcessingMode();
729 : : bool am_superuser;
730 : : char *fullpath;
731 : : char dbname[NAMEDATALEN];
732 : 20949 : int nfree = 0;
733 : :
734 [ + + ]: 20949 : elog(DEBUG3, "InitPostgres");
735 : :
736 : : /*
737 : : * Add my PGPROC struct to the ProcArray.
738 : : *
739 : : * Once I have done this, I am visible to other backends!
740 : : */
741 : 20949 : InitProcessPhase2();
742 : :
743 : : /* Initialize status reporting */
744 : 20949 : pgstat_beinit();
745 : :
746 : : /*
747 : : * And initialize an entry in the PgBackendStatus array. That way, if
748 : : * LWLocks or third-party authentication should happen to hang, it is
749 : : * possible to retrieve some information about what is going on.
750 : : */
751 [ + + ]: 20949 : if (!bootstrap)
752 : : {
753 : 20893 : pgstat_bestart_initial();
754 : 20893 : INJECTION_POINT("init-pre-auth", NULL);
755 : : }
756 : :
757 : : /*
758 : : * Initialize my entry in the shared-invalidation manager's array of
759 : : * per-backend data.
760 : : */
761 : 20949 : SharedInvalBackendInit(false);
762 : :
763 : : /*
764 : : * Prevent consuming interrupts between setting ProcSignalInit and setting
765 : : * the initial local data checksum value. If a barrier is emitted, and
766 : : * absorbed, before local cached state is initialized the state transition
767 : : * can be invalid.
768 : : */
769 : 20949 : HOLD_INTERRUPTS();
770 : :
771 : 20949 : ProcSignalInit(MyCancelKey, MyCancelKeyLength);
772 : :
773 : : /*
774 : : * Initialize a local cache of the data_checksum_version, to be updated by
775 : : * the procsignal-based barriers.
776 : : *
777 : : * This intentionally happens after initializing the procsignal, otherwise
778 : : * we might miss a state change. This means we can get a barrier for the
779 : : * state we've just initialized.
780 : : *
781 : : * The postmaster (which is what gets forked into the new child process)
782 : : * does not handle barriers, therefore it may not have the current value
783 : : * of LocalDataChecksumState value (it'll have the value read from the
784 : : * control file, which may be arbitrarily old).
785 : : *
786 : : * NB: Even if the postmaster handled barriers, the value might still be
787 : : * stale, as it might have changed after this process forked.
788 : : */
789 : 20949 : InitLocalDataChecksumState();
790 : :
791 : 20949 : RESUME_INTERRUPTS();
792 : :
793 : : /*
794 : : * Also set up timeout handlers needed for backend operation. We need
795 : : * these in every case except bootstrap.
796 : : */
797 [ + + ]: 20949 : if (!bootstrap)
798 : : {
799 : 20893 : RegisterTimeout(DEADLOCK_TIMEOUT, CheckDeadLockAlert);
800 : 20893 : RegisterTimeout(STATEMENT_TIMEOUT, StatementTimeoutHandler);
801 : 20893 : RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
802 : 20893 : RegisterTimeout(IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
803 : : IdleInTransactionSessionTimeoutHandler);
804 : 20893 : RegisterTimeout(TRANSACTION_TIMEOUT, TransactionTimeoutHandler);
805 : 20893 : RegisterTimeout(IDLE_SESSION_TIMEOUT, IdleSessionTimeoutHandler);
806 : 20893 : RegisterTimeout(CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler);
807 : 20893 : RegisterTimeout(IDLE_STATS_UPDATE_TIMEOUT,
808 : : IdleStatsUpdateTimeoutHandler);
809 : : }
810 : :
811 : : /*
812 : : * If this is either a bootstrap process or a standalone backend, start up
813 : : * the XLOG machinery, and register to have it closed down at exit. In
814 : : * other cases, the startup process is responsible for starting up the
815 : : * XLOG machinery, and the checkpointer for closing it down.
816 : : */
817 [ + + ]: 20949 : if (!IsUnderPostmaster)
818 : : {
819 : : /*
820 : : * We don't yet have an aux-process resource owner, but StartupXLOG
821 : : * and ShutdownXLOG will need one. Hence, create said resource owner
822 : : * (and register a callback to clean it up after ShutdownXLOG runs).
823 : : */
824 : 132 : CreateAuxProcessResourceOwner();
825 : :
826 : 132 : StartupXLOG();
827 : : /* Release (and warn about) any buffer pins leaked in StartupXLOG */
828 : 132 : ReleaseAuxProcessResources(true);
829 : : /* Reset CurrentResourceOwner to nothing for the moment */
830 : 132 : CurrentResourceOwner = NULL;
831 : :
832 : : /*
833 : : * Use before_shmem_exit() so that ShutdownXLOG() can rely on DSM
834 : : * segments etc to work (which in turn is required for pgstats).
835 : : */
836 : 132 : before_shmem_exit(pgstat_before_server_shutdown, 0);
837 : 132 : before_shmem_exit(ShutdownXLOG, 0);
838 : : }
839 : :
840 : : /*
841 : : * Initialize the process-local logical info WAL logging state.
842 : : *
843 : : * This must be called after ProcSignalInit() so that the process can
844 : : * participate in procsignal-based barriers that update this state.
845 : : * Furthermore, in !IsUnderPostmaster cases, this must occur after
846 : : * StartupXLOG() where the shared state is first established.
847 : : */
848 : 20949 : InitializeProcessXLogLogicalInfo();
849 : :
850 : : /*
851 : : * Initialize the relation cache and the system catalog caches. Note that
852 : : * no catalog access happens here; we only set up the hashtable structure.
853 : : * We must do this before starting a transaction because transaction abort
854 : : * would try to touch these hashtables.
855 : : */
856 : 20949 : RelationCacheInitialize();
857 : 20949 : InitCatalogCache();
858 : 20949 : InitPlanCache();
859 : :
860 : : /* Initialize portal manager */
861 : 20949 : EnablePortalManager();
862 : :
863 : : /*
864 : : * Load relcache entries for the shared system catalogs. This must create
865 : : * at least entries for pg_database and catalogs used for authentication.
866 : : */
867 : 20949 : RelationCacheInitializePhase2();
868 : :
869 : : /*
870 : : * Set up process-exit callback to do pre-shutdown cleanup. This is one
871 : : * of the first before_shmem_exit callbacks we register; thus, this will
872 : : * be one of the last things we do before low-level modules like the
873 : : * buffer manager begin to close down. We need to have this in place
874 : : * before we begin our first transaction --- if we fail during the
875 : : * initialization transaction, as is entirely possible, we need the
876 : : * AbortTransaction call to clean up.
877 : : */
878 : 20949 : before_shmem_exit(ShutdownPostgres, 0);
879 : :
880 : : /* The autovacuum launcher is done here */
881 [ + + ]: 20949 : if (AmAutoVacuumLauncherProcess())
882 : : {
883 : : /* fill in the remainder of this entry in the PgBackendStatus array */
884 : 491 : pgstat_bestart_final();
885 : :
886 : 1581 : return;
887 : : }
888 : :
889 : : /*
890 : : * Start a new transaction here before first access to db.
891 : : */
892 [ + + ]: 20458 : if (!bootstrap)
893 : : {
894 : : /* statement_timestamp must be set for timeouts to work correctly */
895 : 20402 : SetCurrentStatementStartTimestamp();
896 : 20402 : StartTransactionCommand();
897 : :
898 : : /*
899 : : * transaction_isolation will have been set to the default by the
900 : : * above. If the default is "serializable", and we are in hot
901 : : * standby, we will fail if we don't change it to something lower.
902 : : * Fortunately, "read committed" is plenty good enough.
903 : : */
904 : 20402 : XactIsoLevel = XACT_READ_COMMITTED;
905 : : }
906 : :
907 : : /*
908 : : * Perform client authentication if necessary, then figure out our
909 : : * postgres user ID, and see if we are a superuser.
910 : : *
911 : : * In standalone mode, autovacuum worker processes and slot sync worker
912 : : * process, we use a fixed ID, otherwise we figure it out from the
913 : : * authenticated user name.
914 : : */
915 [ + + + + : 20458 : if (bootstrap || AmAutoVacuumWorkerProcess() || AmLogicalSlotSyncWorkerProcess())
+ + ]
916 : : {
917 : 1674 : InitializeSessionUserIdStandalone();
918 : 1674 : am_superuser = true;
919 : : }
920 [ + + ]: 18784 : else if (!IsUnderPostmaster)
921 : : {
922 : 76 : InitializeSessionUserIdStandalone();
923 : 76 : am_superuser = true;
924 [ - + ]: 76 : if (!ThereIsAtLeastOneRole())
925 [ # # # # ]: 0 : ereport(WARNING,
926 : : (errcode(ERRCODE_UNDEFINED_OBJECT),
927 : : errmsg("no roles are defined in this database system"),
928 : : errhint("You should immediately run CREATE USER \"%s\" SUPERUSER;.",
929 : : username != NULL ? username : "postgres")));
930 : : }
931 [ + + + + : 18708 : else if (AmBackgroundWorkerProcess() || AmDataChecksumsWorkerProcess())
+ + ]
932 : : {
933 [ + - + + ]: 3242 : if (username == NULL && !OidIsValid(useroid))
934 : : {
935 : 601 : InitializeSessionUserIdStandalone();
936 : 601 : am_superuser = true;
937 : : }
938 : : else
939 : : {
940 : 2641 : InitializeSessionUserId(username, useroid,
941 : 2641 : (flags & INIT_PG_OVERRIDE_ROLE_LOGIN) != 0);
942 : 2636 : am_superuser = superuser();
943 : : }
944 : : }
945 : : else
946 : : {
947 : : /* normal multiuser case */
948 : : Assert(MyProcPort != NULL);
949 : 15466 : PerformAuthentication(MyProcPort);
950 : 15392 : InitializeSessionUserId(username, useroid, false);
951 : : /* ensure that auth_method is actually valid, aka authn_id is not NULL */
952 [ + + ]: 15388 : if (MyClientConnectionInfo.authn_id)
953 : 136 : InitializeSystemUser(MyClientConnectionInfo.authn_id,
954 : : hba_authname(MyClientConnectionInfo.auth_method));
955 : 15388 : am_superuser = superuser();
956 : : }
957 : :
958 : : /* Report any SSL/GSS details for the session. */
959 [ + + ]: 20375 : if (MyProcPort != NULL)
960 : : {
961 : : Assert(!bootstrap);
962 : :
963 : 15388 : pgstat_bestart_security();
964 : : }
965 : :
966 : : /*
967 : : * Binary upgrades only allowed super-user connections
968 : : */
969 [ + + - + ]: 20375 : if (IsBinaryUpgrade && !am_superuser)
970 : : {
971 [ # # ]: 0 : ereport(FATAL,
972 : : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
973 : : errmsg("must be superuser to connect in binary upgrade mode")));
974 : : }
975 : :
976 : : /*
977 : : * The last few regular connection slots are reserved for superusers and
978 : : * roles with privileges of pg_use_reserved_connections. We do not apply
979 : : * these limits to background processes, since they all have their own
980 : : * pools of PGPROC slots.
981 : : *
982 : : * Note: At this point, the new backend has already claimed a proc struct,
983 : : * so we must check whether the number of free slots is strictly less than
984 : : * the reserved connection limits.
985 : : */
986 [ + + + + ]: 20375 : if (AmRegularBackendProcess() && !am_superuser &&
987 [ + - ]: 283 : (SuperuserReservedConnections + ReservedConnections) > 0 &&
988 [ + + ]: 283 : !HaveNFreeProcs(SuperuserReservedConnections + ReservedConnections, &nfree))
989 : : {
990 [ + + ]: 4 : if (nfree < SuperuserReservedConnections)
991 [ + - ]: 1 : ereport(FATAL,
992 : : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
993 : : errmsg("remaining connection slots are reserved for roles with the %s attribute",
994 : : "SUPERUSER")));
995 : :
996 [ + + ]: 3 : if (!has_privs_of_role(GetUserId(), ROLE_PG_USE_RESERVED_CONNECTIONS))
997 [ + - ]: 1 : ereport(FATAL,
998 : : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
999 : : errmsg("remaining connection slots are reserved for roles with privileges of the \"%s\" role",
1000 : : "pg_use_reserved_connections")));
1001 : : }
1002 : :
1003 : : /* Check replication permissions needed for walsender processes. */
1004 [ + + ]: 20373 : if (am_walsender)
1005 : : {
1006 : : Assert(!bootstrap);
1007 : :
1008 [ - + ]: 1362 : if (!has_rolreplication(GetUserId()))
1009 [ # # ]: 0 : ereport(FATAL,
1010 : : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1011 : : errmsg("permission denied to start WAL sender"),
1012 : : errdetail("Only roles with the %s attribute may start a WAL sender process.",
1013 : : "REPLICATION")));
1014 : : }
1015 : :
1016 : : /*
1017 : : * If this is a plain walsender only supporting physical replication, we
1018 : : * don't want to connect to any particular database. Just finish the
1019 : : * backend startup by processing any options from the startup packet, and
1020 : : * we're done.
1021 : : */
1022 [ + + + + ]: 20373 : if (am_walsender && !am_db_walsender)
1023 : : {
1024 : : /* process any options passed in the startup packet */
1025 [ + - ]: 536 : if (MyProcPort != NULL)
1026 : 536 : process_startup_options(MyProcPort, am_superuser);
1027 : :
1028 : : /* Apply PostAuthDelay as soon as we've read all options */
1029 [ - + ]: 536 : if (PostAuthDelay > 0)
1030 : 0 : pg_usleep(PostAuthDelay * 1000000L);
1031 : :
1032 : : /* initialize client encoding */
1033 : 536 : InitializeClientEncoding();
1034 : :
1035 : : /* fill in the remainder of this entry in the PgBackendStatus array */
1036 : 536 : pgstat_bestart_final();
1037 : :
1038 : : /* close the transaction we started above */
1039 : 536 : CommitTransactionCommand();
1040 : :
1041 : : /* send any WARNINGs we've accumulated during initialization */
1042 : 536 : EmitConnectionWarnings();
1043 : :
1044 : 536 : return;
1045 : : }
1046 : :
1047 : : /*
1048 : : * Set up the global variables holding database id and default tablespace.
1049 : : * But note we won't actually try to touch the database just yet.
1050 : : *
1051 : : * We take a shortcut in the bootstrap case, otherwise we have to look up
1052 : : * the db's entry in pg_database.
1053 : : */
1054 [ + + ]: 19837 : if (bootstrap)
1055 : : {
1056 : 56 : dboid = Template1DbOid;
1057 : 56 : MyDatabaseTableSpace = DEFAULTTABLESPACE_OID;
1058 : : }
1059 [ + + ]: 19781 : else if (in_dbname != NULL)
1060 : : {
1061 : : HeapTuple tuple;
1062 : : Form_pg_database dbform;
1063 : :
1064 : 14932 : tuple = GetDatabaseTuple(in_dbname);
1065 [ + + ]: 14932 : if (!HeapTupleIsValid(tuple))
1066 [ + - ]: 9 : ereport(FATAL,
1067 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
1068 : : errmsg("database \"%s\" does not exist", in_dbname)));
1069 : 14923 : dbform = (Form_pg_database) GETSTRUCT(tuple);
1070 : 14923 : dboid = dbform->oid;
1071 : : }
1072 [ + + ]: 4849 : else if (!OidIsValid(dboid))
1073 : : {
1074 : : /*
1075 : : * If this is a background worker not bound to any particular
1076 : : * database, we're done now. Everything that follows only makes sense
1077 : : * if we are bound to a specific database. We do need to close the
1078 : : * transaction we started before returning.
1079 : : */
1080 [ + - ]: 554 : if (!bootstrap)
1081 : : {
1082 : 554 : pgstat_bestart_final();
1083 : 554 : CommitTransactionCommand();
1084 : : }
1085 : 554 : return;
1086 : : }
1087 : :
1088 : : /*
1089 : : * Now, take a writer's lock on the database we are trying to connect to.
1090 : : * If there is a concurrently running DROP DATABASE on that database, this
1091 : : * will block us until it finishes (and has committed its update of
1092 : : * pg_database).
1093 : : *
1094 : : * Note that the lock is not held long, only until the end of this startup
1095 : : * transaction. This is OK since we will advertise our use of the
1096 : : * database in the ProcArray before dropping the lock (in fact, that's the
1097 : : * next thing to do). Anyone trying a DROP DATABASE after this point will
1098 : : * see us in the array once they have the lock. Ordering is important for
1099 : : * this because we don't want to advertise ourselves as being in this
1100 : : * database until we have the lock; otherwise we create what amounts to a
1101 : : * deadlock with CountOtherDBBackends().
1102 : : *
1103 : : * Note: use of RowExclusiveLock here is reasonable because we envision
1104 : : * our session as being a concurrent writer of the database. If we had a
1105 : : * way of declaring a session as being guaranteed-read-only, we could use
1106 : : * AccessShareLock for such sessions and thereby not conflict against
1107 : : * CREATE DATABASE.
1108 : : */
1109 [ + + ]: 19274 : if (!bootstrap)
1110 : 19218 : LockSharedObject(DatabaseRelationId, dboid, 0, RowExclusiveLock);
1111 : :
1112 : : /*
1113 : : * Recheck pg_database to make sure the target database hasn't gone away.
1114 : : * If there was a concurrent DROP DATABASE, this ensures we will die
1115 : : * cleanly without creating a mess.
1116 : : */
1117 [ + + ]: 19274 : if (!bootstrap)
1118 : : {
1119 : : HeapTuple tuple;
1120 : : Form_pg_database datform;
1121 : :
1122 : 19218 : tuple = GetDatabaseTupleByOid(dboid);
1123 [ + + ]: 19218 : if (HeapTupleIsValid(tuple))
1124 : 19217 : datform = (Form_pg_database) GETSTRUCT(tuple);
1125 : :
1126 [ + + + + ]: 19218 : if (!HeapTupleIsValid(tuple) ||
1127 [ - + ]: 14923 : (in_dbname && namestrcmp(&datform->datname, in_dbname)))
1128 : : {
1129 [ - + ]: 1 : if (in_dbname)
1130 [ # # ]: 0 : ereport(FATAL,
1131 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
1132 : : errmsg("database \"%s\" does not exist", in_dbname),
1133 : : errdetail("It seems to have just been dropped or renamed.")));
1134 : : else
1135 [ + - ]: 1 : ereport(FATAL,
1136 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
1137 : : errmsg("database %u does not exist", dboid)));
1138 : : }
1139 : :
1140 : 19217 : strlcpy(dbname, NameStr(datform->datname), sizeof(dbname));
1141 : :
1142 [ + + ]: 19217 : if (database_is_invalid_form(datform))
1143 : : {
1144 [ + - ]: 7 : ereport(FATAL,
1145 : : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1146 : : errmsg("cannot connect to invalid database \"%s\"", dbname),
1147 : : errhint("Use DROP DATABASE to drop invalid databases."));
1148 : : }
1149 : :
1150 : 19210 : MyDatabaseTableSpace = datform->dattablespace;
1151 : 19210 : MyDatabaseHasLoginEventTriggers = datform->dathasloginevt;
1152 : : /* pass the database name back to the caller */
1153 [ + + ]: 19210 : if (out_dbname)
1154 : 1612 : strcpy(out_dbname, dbname);
1155 : : }
1156 : :
1157 : : /*
1158 : : * Now that we rechecked, we are certain to be connected to a database and
1159 : : * thus can set MyDatabaseId.
1160 : : *
1161 : : * It is important that MyDatabaseId only be set once we are sure that the
1162 : : * target database can no longer be concurrently dropped or renamed. For
1163 : : * example, without this guarantee, pgstat_update_dbstats() could create
1164 : : * entries for databases that were just dropped in the pgstat shutdown
1165 : : * callback, which could confuse other code paths like the autovacuum
1166 : : * scheduler.
1167 : : */
1168 : 19266 : MyDatabaseId = dboid;
1169 : :
1170 : : /*
1171 : : * Now we can mark our PGPROC entry with the database ID.
1172 : : *
1173 : : * We assume this is an atomic store so no lock is needed; though actually
1174 : : * things would work fine even if it weren't atomic. Anyone searching the
1175 : : * ProcArray for this database's ID should hold the database lock, so they
1176 : : * would not be executing concurrently with this store. A process looking
1177 : : * for another database's ID could in theory see a chance match if it read
1178 : : * a partially-updated databaseId value; but as long as all such searches
1179 : : * wait and retry, as in CountOtherDBBackends(), they will certainly see
1180 : : * the correct value on their next try.
1181 : : */
1182 : 19266 : MyProc->databaseId = MyDatabaseId;
1183 : :
1184 : : /*
1185 : : * We established a catalog snapshot while reading pg_authid and/or
1186 : : * pg_database; but until we have set up MyDatabaseId, we won't react to
1187 : : * incoming sinval messages for unshared catalogs, so we won't realize it
1188 : : * if the snapshot has been invalidated. Assume it's no good anymore.
1189 : : */
1190 : 19266 : InvalidateCatalogSnapshot();
1191 : :
1192 : : /*
1193 : : * Now we should be able to access the database directory safely. Verify
1194 : : * it's there and looks reasonable.
1195 : : */
1196 : 19266 : fullpath = GetDatabasePath(MyDatabaseId, MyDatabaseTableSpace);
1197 : :
1198 [ + + ]: 19266 : if (!bootstrap)
1199 : : {
1200 [ - + ]: 19210 : if (access(fullpath, F_OK) == -1)
1201 : : {
1202 [ # # ]: 0 : if (errno == ENOENT)
1203 [ # # ]: 0 : ereport(FATAL,
1204 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
1205 : : errmsg("database \"%s\" does not exist",
1206 : : dbname),
1207 : : errdetail("The database subdirectory \"%s\" is missing.",
1208 : : fullpath)));
1209 : : else
1210 [ # # ]: 0 : ereport(FATAL,
1211 : : (errcode_for_file_access(),
1212 : : errmsg("could not access directory \"%s\": %m",
1213 : : fullpath)));
1214 : : }
1215 : :
1216 : 19210 : ValidatePgVersion(fullpath);
1217 : : }
1218 : :
1219 : 19266 : SetDatabasePath(fullpath);
1220 : 19266 : pfree(fullpath);
1221 : :
1222 : : /*
1223 : : * It's now possible to do real access to the system catalogs.
1224 : : *
1225 : : * Load relcache entries for the system catalogs. This must create at
1226 : : * least the minimum set of "nailed-in" cache entries.
1227 : : */
1228 : 19266 : RelationCacheInitializePhase3();
1229 : :
1230 : : /* set up ACL framework (so CheckMyDatabase can check permissions) */
1231 : 19266 : initialize_acl();
1232 : :
1233 : : /*
1234 : : * Re-read the pg_database row for our database, check permissions and set
1235 : : * up database-specific GUC settings. We can't do this until all the
1236 : : * database-access infrastructure is up. (Also, it wants to know if the
1237 : : * user is a superuser, so the above stuff has to happen first.)
1238 : : */
1239 [ + + ]: 19266 : if (!bootstrap)
1240 : 19210 : CheckMyDatabase(dbname, am_superuser,
1241 : 19210 : (flags & INIT_PG_OVERRIDE_ALLOW_CONNS) != 0);
1242 : :
1243 : : /*
1244 : : * Now process any command-line switches and any additional GUC variable
1245 : : * settings passed in the startup packet. We couldn't do this before
1246 : : * because we didn't know if client is a superuser.
1247 : : */
1248 [ + + ]: 19263 : if (MyProcPort != NULL)
1249 : 14835 : process_startup_options(MyProcPort, am_superuser);
1250 : :
1251 : : /* Process pg_db_role_setting options */
1252 : 19263 : process_settings(MyDatabaseId, GetSessionUserId());
1253 : :
1254 : : /* Apply PostAuthDelay as soon as we've read all options */
1255 [ - + ]: 19263 : if (PostAuthDelay > 0)
1256 : 0 : pg_usleep(PostAuthDelay * 1000000L);
1257 : :
1258 : : /*
1259 : : * Initialize various default states that can't be set up until we've
1260 : : * selected the active user and gotten the right GUC settings.
1261 : : */
1262 : :
1263 : : /* set default namespace search path */
1264 : 19263 : InitializeSearchPath();
1265 : :
1266 : : /* initialize client encoding */
1267 : 19263 : InitializeClientEncoding();
1268 : :
1269 : : /* Initialize this backend's session state. */
1270 : 19263 : InitializeSession();
1271 : :
1272 : : /*
1273 : : * If this is an interactive session, load any libraries that should be
1274 : : * preloaded at backend start. Since those are determined by GUCs, this
1275 : : * can't happen until GUC settings are complete, but we want it to happen
1276 : : * during the initial transaction in case anything that requires database
1277 : : * access needs to be done.
1278 : : */
1279 [ + + ]: 19263 : if ((flags & INIT_PG_LOAD_SESSION_LIBS) != 0)
1280 : 14083 : process_session_preload_libraries();
1281 : :
1282 : : /* fill in the remainder of this entry in the PgBackendStatus array */
1283 [ + + ]: 19263 : if (!bootstrap)
1284 : 19207 : pgstat_bestart_final();
1285 : :
1286 : : /* close the transaction we started above */
1287 [ + + ]: 19263 : if (!bootstrap)
1288 : 19207 : CommitTransactionCommand();
1289 : :
1290 : : /* send any WARNINGs we've accumulated during initialization */
1291 : 19263 : EmitConnectionWarnings();
1292 : : }
1293 : :
1294 : : /*
1295 : : * Process any command-line switches and any additional GUC variable
1296 : : * settings passed in the startup packet.
1297 : : */
1298 : : static void
1299 : 15371 : process_startup_options(Port *port, bool am_superuser)
1300 : : {
1301 : : GucContext gucctx;
1302 : : ListCell *gucopts;
1303 : :
1304 [ + + ]: 15371 : gucctx = am_superuser ? PGC_SU_BACKEND : PGC_BACKEND;
1305 : :
1306 : : /*
1307 : : * First process any command-line switches that were included in the
1308 : : * startup packet, if we are in a regular backend.
1309 : : */
1310 [ + + ]: 15371 : if (port->cmdline_options != NULL)
1311 : : {
1312 : : /*
1313 : : * The maximum possible number of commandline arguments that could
1314 : : * come from port->cmdline_options is (strlen + 1) / 2; see
1315 : : * pg_split_opts().
1316 : : */
1317 : : char **av;
1318 : : int maxac;
1319 : : int ac;
1320 : :
1321 : 4499 : maxac = 2 + (strlen(port->cmdline_options) + 1) / 2;
1322 : :
1323 : 4499 : av = palloc_array(char *, maxac);
1324 : 4499 : ac = 0;
1325 : :
1326 : 4499 : av[ac++] = "postgres";
1327 : :
1328 : 4499 : pg_split_opts(av, &ac, port->cmdline_options);
1329 : :
1330 : 4499 : av[ac] = NULL;
1331 : :
1332 : : Assert(ac < maxac);
1333 : :
1334 : 4499 : (void) process_postgres_switches(ac, av, gucctx, NULL);
1335 : : }
1336 : :
1337 : : /*
1338 : : * Process any additional GUC variable settings passed in startup packet.
1339 : : * These are handled exactly like command-line variables.
1340 : : */
1341 : 15371 : gucopts = list_head(port->guc_options);
1342 [ + + ]: 37024 : while (gucopts)
1343 : : {
1344 : : char *name;
1345 : : char *value;
1346 : :
1347 : 21653 : name = lfirst(gucopts);
1348 : 21653 : gucopts = lnext(port->guc_options, gucopts);
1349 : :
1350 : 21653 : value = lfirst(gucopts);
1351 : 21653 : gucopts = lnext(port->guc_options, gucopts);
1352 : :
1353 : 21653 : SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
1354 : : }
1355 : 15371 : }
1356 : :
1357 : : /*
1358 : : * Load GUC settings from pg_db_role_setting.
1359 : : *
1360 : : * We try specific settings for the database/role combination, as well as
1361 : : * general for this database and for this user.
1362 : : */
1363 : : static void
1364 : 19263 : process_settings(Oid databaseid, Oid roleid)
1365 : : {
1366 : : Relation relsetting;
1367 : : Snapshot snapshot;
1368 : :
1369 [ + + ]: 19263 : if (!IsUnderPostmaster)
1370 : 130 : return;
1371 : :
1372 : 19133 : relsetting = table_open(DbRoleSettingRelationId, AccessShareLock);
1373 : :
1374 : : /* read all the settings under the same snapshot for efficiency */
1375 : 19133 : snapshot = RegisterSnapshot(GetCatalogSnapshot(DbRoleSettingRelationId));
1376 : :
1377 : : /* Later settings are ignored if set earlier. */
1378 : 19133 : ApplySetting(snapshot, databaseid, roleid, relsetting, PGC_S_DATABASE_USER);
1379 : 19133 : ApplySetting(snapshot, InvalidOid, roleid, relsetting, PGC_S_USER);
1380 : 19133 : ApplySetting(snapshot, databaseid, InvalidOid, relsetting, PGC_S_DATABASE);
1381 : 19133 : ApplySetting(snapshot, InvalidOid, InvalidOid, relsetting, PGC_S_GLOBAL);
1382 : :
1383 : 19133 : UnregisterSnapshot(snapshot);
1384 : 19133 : table_close(relsetting, AccessShareLock);
1385 : : }
1386 : :
1387 : : /*
1388 : : * Backend-shutdown callback. Do cleanup that we want to be sure happens
1389 : : * before all the supporting modules begin to nail their doors shut via
1390 : : * their own callbacks.
1391 : : *
1392 : : * User-level cleanup, such as temp-relation removal and UNLISTEN, happens
1393 : : * via separate callbacks that execute before this one. We don't combine the
1394 : : * callbacks because we still want this one to happen if the user-level
1395 : : * cleanup fails.
1396 : : */
1397 : : static void
1398 : 20949 : ShutdownPostgres(int code, Datum arg)
1399 : : {
1400 : : /* Make sure we've killed any active transaction */
1401 : 20949 : AbortOutOfAnyTransaction();
1402 : :
1403 : : /*
1404 : : * User locks are not released by transaction end, so be sure to release
1405 : : * them explicitly.
1406 : : */
1407 : 20949 : LockReleaseAll(USER_LOCKMETHOD, true);
1408 : 20949 : }
1409 : :
1410 : :
1411 : : /*
1412 : : * STATEMENT_TIMEOUT handler: trigger a query-cancel interrupt.
1413 : : */
1414 : : static void
1415 : 6 : StatementTimeoutHandler(void)
1416 : : {
1417 : 6 : int sig = SIGINT;
1418 : :
1419 : : /*
1420 : : * During authentication the timeout is used to deal with
1421 : : * authentication_timeout - we want to quit in response to such timeouts.
1422 : : */
1423 [ - + ]: 6 : if (ClientAuthInProgress)
1424 : 0 : sig = SIGTERM;
1425 : :
1426 : : #ifdef HAVE_SETSID
1427 : : /* try to signal whole process group */
1428 : 6 : kill(-MyProcPid, sig);
1429 : : #endif
1430 : 6 : kill(MyProcPid, sig);
1431 : 6 : }
1432 : :
1433 : : /*
1434 : : * LOCK_TIMEOUT handler: trigger a query-cancel interrupt.
1435 : : */
1436 : : static void
1437 : 4 : LockTimeoutHandler(void)
1438 : : {
1439 : : #ifdef HAVE_SETSID
1440 : : /* try to signal whole process group */
1441 : 4 : kill(-MyProcPid, SIGINT);
1442 : : #endif
1443 : 4 : kill(MyProcPid, SIGINT);
1444 : 4 : }
1445 : :
1446 : : static void
1447 : 1 : TransactionTimeoutHandler(void)
1448 : : {
1449 : 1 : TransactionTimeoutPending = true;
1450 : 1 : InterruptPending = true;
1451 : 1 : SetLatch(MyLatch);
1452 : 1 : }
1453 : :
1454 : : static void
1455 : 1 : IdleInTransactionSessionTimeoutHandler(void)
1456 : : {
1457 : 1 : IdleInTransactionSessionTimeoutPending = true;
1458 : 1 : InterruptPending = true;
1459 : 1 : SetLatch(MyLatch);
1460 : 1 : }
1461 : :
1462 : : static void
1463 : 1 : IdleSessionTimeoutHandler(void)
1464 : : {
1465 : 1 : IdleSessionTimeoutPending = true;
1466 : 1 : InterruptPending = true;
1467 : 1 : SetLatch(MyLatch);
1468 : 1 : }
1469 : :
1470 : : static void
1471 : 18 : IdleStatsUpdateTimeoutHandler(void)
1472 : : {
1473 : 18 : IdleStatsUpdateTimeoutPending = true;
1474 : 18 : InterruptPending = true;
1475 : 18 : SetLatch(MyLatch);
1476 : 18 : }
1477 : :
1478 : : static void
1479 : 0 : ClientCheckTimeoutHandler(void)
1480 : : {
1481 : 0 : CheckClientConnectionPending = true;
1482 : 0 : InterruptPending = true;
1483 : 0 : SetLatch(MyLatch);
1484 : 0 : }
1485 : :
1486 : : /*
1487 : : * Returns true if at least one role is defined in this database cluster.
1488 : : */
1489 : : static bool
1490 : 76 : ThereIsAtLeastOneRole(void)
1491 : : {
1492 : : Relation pg_authid_rel;
1493 : : TableScanDesc scan;
1494 : : bool result;
1495 : :
1496 : 76 : pg_authid_rel = table_open(AuthIdRelationId, AccessShareLock);
1497 : :
1498 : 76 : scan = table_beginscan_catalog(pg_authid_rel, 0, NULL);
1499 : 76 : result = (heap_getnext(scan, ForwardScanDirection) != NULL);
1500 : :
1501 : 76 : table_endscan(scan);
1502 : 76 : table_close(pg_authid_rel, AccessShareLock);
1503 : :
1504 : 76 : return result;
1505 : : }
1506 : :
1507 : : /*
1508 : : * Stores a warning message to be sent later via EmitConnectionWarnings().
1509 : : * Both msg and detail must be non-NULL. If filter is non-NULL, it is called
1510 : : * just before the warning is emitted, after startup and role/database settings
1511 : : * have been applied.
1512 : : *
1513 : : * NB: Caller should ensure the strings are palloc'd in a long-lived context
1514 : : * like TopMemoryContext. This function takes ownership of the strings, which
1515 : : * will be pfree'd in EmitConnectionWarnings().
1516 : : */
1517 : : void
1518 : 5 : StoreConnectionWarning(char *msg, char *detail, ConnectionWarningFilter filter)
1519 : : {
1520 : : MemoryContext oldcontext;
1521 : : ConnectionWarning *warning;
1522 : :
1523 : : Assert(msg);
1524 : : Assert(detail);
1525 : :
1526 [ - + ]: 5 : if (ConnectionWarningsEmitted)
1527 [ # # ]: 0 : elog(ERROR, "StoreConnectionWarning() called after EmitConnectionWarnings()");
1528 : :
1529 : 5 : oldcontext = MemoryContextSwitchTo(TopMemoryContext);
1530 : :
1531 : 5 : warning = palloc_object(ConnectionWarning);
1532 : 5 : warning->message = msg;
1533 : 5 : warning->detail = detail;
1534 : 5 : warning->filter = filter;
1535 : 5 : ConnectionWarnings = lappend(ConnectionWarnings, warning);
1536 : :
1537 : 5 : MemoryContextSwitchTo(oldcontext);
1538 : 5 : }
1539 : :
1540 : : /*
1541 : : * Sends the warning messages saved via StoreConnectionWarning() and frees the
1542 : : * strings and lists.
1543 : : *
1544 : : * NB: This can only be called once per backend.
1545 : : */
1546 : : static void
1547 : 19799 : EmitConnectionWarnings(void)
1548 : : {
1549 [ - + ]: 19799 : if (ConnectionWarningsEmitted)
1550 [ # # ]: 0 : elog(ERROR, "EmitConnectionWarnings() called more than once");
1551 : : else
1552 : 19799 : ConnectionWarningsEmitted = true;
1553 : :
1554 [ + + + + : 39603 : foreach_ptr(ConnectionWarning, warning, ConnectionWarnings)
+ + ]
1555 : : {
1556 [ + + + + ]: 5 : if (warning->filter == NULL || warning->filter())
1557 [ + - ]: 3 : ereport(WARNING,
1558 : : (errmsg("%s", warning->message),
1559 : : errdetail("%s", warning->detail)));
1560 : :
1561 : 5 : pfree(warning->message);
1562 : 5 : pfree(warning->detail);
1563 : 5 : pfree(warning);
1564 : : }
1565 : :
1566 : 19799 : list_free(ConnectionWarnings);
1567 : 19799 : ConnectionWarnings = NIL;
1568 : 19799 : }
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