Age Owner TLA Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * postinit.c
4 : * postgres initialization utilities
5 : *
6 : * Portions Copyright (c) 1996-2023, 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/sysattr.h"
27 : #include "access/tableam.h"
28 : #include "access/xact.h"
29 : #include "access/xlog.h"
30 : #include "access/xloginsert.h"
31 : #include "catalog/catalog.h"
32 : #include "catalog/namespace.h"
33 : #include "catalog/pg_authid.h"
34 : #include "catalog/pg_collation.h"
35 : #include "catalog/pg_database.h"
36 : #include "catalog/pg_db_role_setting.h"
37 : #include "catalog/pg_tablespace.h"
38 : #include "libpq/auth.h"
39 : #include "libpq/libpq-be.h"
40 : #include "mb/pg_wchar.h"
41 : #include "miscadmin.h"
42 : #include "pgstat.h"
43 : #include "postmaster/autovacuum.h"
44 : #include "postmaster/postmaster.h"
45 : #include "replication/slot.h"
46 : #include "replication/walsender.h"
47 : #include "storage/bufmgr.h"
48 : #include "storage/fd.h"
49 : #include "storage/ipc.h"
50 : #include "storage/lmgr.h"
51 : #include "storage/proc.h"
52 : #include "storage/procarray.h"
53 : #include "storage/procsignal.h"
54 : #include "storage/sinvaladt.h"
55 : #include "storage/smgr.h"
56 : #include "storage/sync.h"
57 : #include "tcop/tcopprot.h"
58 : #include "utils/acl.h"
59 : #include "utils/builtins.h"
60 : #include "utils/fmgroids.h"
61 : #include "utils/guc_hooks.h"
62 : #include "utils/memutils.h"
63 : #include "utils/pg_locale.h"
64 : #include "utils/portal.h"
65 : #include "utils/ps_status.h"
66 : #include "utils/snapmgr.h"
67 : #include "utils/syscache.h"
68 : #include "utils/timeout.h"
69 :
70 : static HeapTuple GetDatabaseTuple(const char *dbname);
71 : static HeapTuple GetDatabaseTupleByOid(Oid dboid);
72 : static void PerformAuthentication(Port *port);
73 : static void CheckMyDatabase(const char *name, bool am_superuser, bool override_allow_connections);
74 : static void ShutdownPostgres(int code, Datum arg);
75 : static void StatementTimeoutHandler(void);
76 : static void LockTimeoutHandler(void);
77 : static void IdleInTransactionSessionTimeoutHandler(void);
78 : static void IdleSessionTimeoutHandler(void);
79 : static void IdleStatsUpdateTimeoutHandler(void);
80 : static void ClientCheckTimeoutHandler(void);
81 : static bool ThereIsAtLeastOneRole(void);
82 : static void process_startup_options(Port *port, bool am_superuser);
83 : static void process_settings(Oid databaseid, Oid roleid);
84 :
85 :
86 : /*** InitPostgres support ***/
87 :
88 :
89 : /*
90 : * GetDatabaseTuple -- fetch the pg_database row for a database
91 : *
92 : * This is used during backend startup when we don't yet have any access to
93 : * system catalogs in general. In the worst case, we can seqscan pg_database
94 : * using nothing but the hard-wired descriptor that relcache.c creates for
95 : * pg_database. In more typical cases, relcache.c was able to load
96 : * descriptors for both pg_database and its indexes from the shared relcache
97 : * cache file, and so we can do an indexscan. criticalSharedRelcachesBuilt
98 : * tells whether we got the cached descriptors.
99 : */
100 : static HeapTuple
4988 tgl 101 CBC 18805 : GetDatabaseTuple(const char *dbname)
102 : {
103 : HeapTuple tuple;
104 : Relation relation;
105 : SysScanDesc scan;
106 : ScanKeyData key[1];
107 :
108 : /*
109 : * form a scan key
110 : */
111 18805 : ScanKeyInit(&key[0],
112 : Anum_pg_database_datname,
113 : BTEqualStrategyNumber, F_NAMEEQ,
114 : CStringGetDatum(dbname));
115 :
116 : /*
117 : * Open pg_database and fetch a tuple. Force heap scan if we haven't yet
118 : * built the critical shared relcache entries (i.e., we're starting up
119 : * without a shared relcache cache file).
120 : */
1539 andres 121 18805 : relation = table_open(DatabaseRelationId, AccessShareLock);
4988 tgl 122 18805 : scan = systable_beginscan(relation, DatabaseNameIndexId,
123 : criticalSharedRelcachesBuilt,
124 : NULL,
125 : 1, key);
126 :
127 18805 : tuple = systable_getnext(scan);
128 :
129 : /* Must copy tuple before releasing buffer */
130 18805 : if (HeapTupleIsValid(tuple))
131 18798 : tuple = heap_copytuple(tuple);
132 :
133 : /* all done */
134 18805 : systable_endscan(scan);
1539 andres 135 18805 : table_close(relation, AccessShareLock);
136 :
4988 tgl 137 18805 : return tuple;
138 : }
139 :
140 : /*
141 : * GetDatabaseTupleByOid -- as above, but search by database OID
142 : */
143 : static HeapTuple
144 1632 : GetDatabaseTupleByOid(Oid dboid)
145 : {
146 : HeapTuple tuple;
147 : Relation relation;
148 : SysScanDesc scan;
149 : ScanKeyData key[1];
150 :
151 : /*
152 : * form a scan key
153 : */
154 1632 : ScanKeyInit(&key[0],
155 : Anum_pg_database_oid,
156 : BTEqualStrategyNumber, F_OIDEQ,
157 : ObjectIdGetDatum(dboid));
158 :
159 : /*
160 : * Open pg_database and fetch a tuple. Force heap scan if we haven't yet
161 : * built the critical shared relcache entries (i.e., we're starting up
162 : * without a shared relcache cache file).
163 : */
1539 andres 164 1632 : relation = table_open(DatabaseRelationId, AccessShareLock);
4988 tgl 165 1632 : scan = systable_beginscan(relation, DatabaseOidIndexId,
166 : criticalSharedRelcachesBuilt,
167 : NULL,
168 : 1, key);
169 :
170 1632 : tuple = systable_getnext(scan);
171 :
172 : /* Must copy tuple before releasing buffer */
173 1632 : if (HeapTupleIsValid(tuple))
174 1632 : tuple = heap_copytuple(tuple);
175 :
176 : /* all done */
177 1632 : systable_endscan(scan);
1539 andres 178 1632 : table_close(relation, AccessShareLock);
179 :
4988 tgl 180 1632 : return tuple;
181 : }
182 :
183 :
184 : /*
185 : * PerformAuthentication -- authenticate a remote client
186 : *
187 : * returns: nothing. Will not return at all if there's any failure.
188 : */
189 : static void
4971 190 8695 : PerformAuthentication(Port *port)
191 : {
192 : /* This should be set already, but let's make sure */
193 8695 : ClientAuthInProgress = true; /* limit visibility of log messages */
194 :
195 : /*
196 : * In EXEC_BACKEND case, we didn't inherit the contents of pg_hba.conf
197 : * etcetera from the postmaster, and have to load them ourselves.
198 : *
199 : * FIXME: [fork/exec] Ugh. Is there a way around this overhead?
200 : */
201 : #ifdef EXEC_BACKEND
202 :
203 : /*
204 : * load_hba() and load_ident() want to work within the PostmasterContext,
205 : * so create that if it doesn't exist (which it won't). We'll delete it
206 : * again later, in PostgresMain.
207 : */
208 : if (PostmasterContext == NULL)
209 : PostmasterContext = AllocSetContextCreate(TopMemoryContext,
210 : "Postmaster",
211 : ALLOCSET_DEFAULT_SIZES);
212 :
213 : if (!load_hba())
214 : {
215 : /*
216 : * It makes no sense to continue if we fail to load the HBA file,
217 : * since there is no way to connect to the database in this case.
218 : */
219 : ereport(FATAL,
220 : /* translator: %s is a configuration file */
221 : (errmsg("could not load %s", HbaFileName)));
222 : }
223 :
224 : if (!load_ident())
225 : {
226 : /*
227 : * It is ok to continue if we fail to load the IDENT file, although it
228 : * means that you cannot log in using any of the authentication
229 : * methods that need a user name mapping. load_ident() already logged
230 : * the details of error to the log.
231 : */
232 : }
233 : #endif
234 :
235 : /*
236 : * Set up a timeout in case a buggy or malicious client fails to respond
237 : * during authentication. Since we're inside a transaction and might do
238 : * database access, we have to use the statement_timeout infrastructure.
239 : */
3919 alvherre 240 GIC 8695 : enable_timeout_after(STATEMENT_TIMEOUT, AuthenticationTimeout * 1000);
4971 tgl 241 ECB :
242 : /*
243 : * Now perform authentication exchange.
244 : */
1124 peter 245 GIC 8695 : set_ps_display("authentication");
4971 tgl 246 CBC 8695 : ClientAuthentication(port); /* might not return, if failure */
4971 tgl 247 ECB :
248 : /*
249 : * Done with authentication. Disable the timeout, and log if needed.
250 : */
3919 alvherre 251 GIC 8628 : disable_timeout(STATEMENT_TIMEOUT, false);
4971 tgl 252 ECB :
4464 magnus 253 GIC 8628 : if (Log_connections)
4763 simon 254 ECB : {
255 : StringInfoData logmsg;
256 :
858 sfrost 257 GIC 257 : initStringInfo(&logmsg);
4464 magnus 258 CBC 257 : if (am_walsender)
858 sfrost 259 3 : appendStringInfo(&logmsg, _("replication connection authorized: user=%s"),
858 sfrost 260 ECB : port->user_name);
261 : else
858 sfrost 262 GIC 254 : appendStringInfo(&logmsg, _("connection authorized: user=%s"),
858 sfrost 263 ECB : port->user_name);
858 sfrost 264 GIC 257 : if (!am_walsender)
858 sfrost 265 CBC 254 : appendStringInfo(&logmsg, _(" database=%s"), port->database_name);
858 sfrost 266 ECB :
858 sfrost 267 GIC 257 : if (port->application_name != NULL)
858 sfrost 268 CBC 257 : appendStringInfo(&logmsg, _(" application_name=%s"),
858 sfrost 269 ECB : port->application_name);
270 :
271 : #ifdef USE_SSL
858 sfrost 272 GIC 257 : if (port->ssl_in_use)
761 michael 273 CBC 76 : appendStringInfo(&logmsg, _(" SSL enabled (protocol=%s, cipher=%s, bits=%d)"),
858 sfrost 274 ECB : be_tls_get_version(port),
275 : be_tls_get_cipher(port),
276 : be_tls_get_cipher_bits(port));
277 : #endif
278 : #ifdef ENABLE_GSS
832 tgl 279 GIC 257 : if (port->gss)
832 tgl 280 ECB : {
832 tgl 281 GIC 17 : const char *princ = be_gssapi_get_princ(port);
832 tgl 282 ECB :
832 tgl 283 GIC 17 : if (princ)
832 tgl 284 CBC 34 : appendStringInfo(&logmsg,
1 sfrost 285 17 : _(" GSS (authenticated=%s, encrypted=%s, principal=%s)"),
832 tgl 286 34 : be_gssapi_get_auth(port) ? _("yes") : _("no"),
287 34 : be_gssapi_get_enc(port) ? _("yes") : _("no"),
832 tgl 288 ECB : princ);
289 : else
832 tgl 290 UIC 0 : appendStringInfo(&logmsg,
1 sfrost 291 UBC 0 : _(" GSS (authenticated=%s, encrypted=%s)"),
832 tgl 292 0 : be_gssapi_get_auth(port) ? _("yes") : _("no"),
1 sfrost 293 0 : be_gssapi_get_enc(port) ? _("yes") : _("no"));
832 tgl 294 EUB : }
295 : #endif
296 :
858 sfrost 297 GIC 257 : ereport(LOG, errmsg_internal("%s", logmsg.data));
858 sfrost 298 CBC 257 : pfree(logmsg.data);
4763 simon 299 ECB : }
300 :
1124 peter 301 GIC 8628 : set_ps_display("startup");
4968 tgl 302 ECB :
2118 tgl 303 GIC 8628 : ClientAuthInProgress = false; /* client_min_messages is active now */
4971 tgl 304 CBC 8628 : }
4971 tgl 305 ECB :
306 :
307 : /*
308 : * CheckMyDatabase -- fetch information from the pg_database entry for our DB
309 : */
310 : static void
1830 magnus 311 GIC 10213 : CheckMyDatabase(const char *name, bool am_superuser, bool override_allow_connections)
8598 tgl 312 ECB : {
313 : HeapTuple tup;
314 : Form_pg_database dbform;
315 : Datum datum;
316 : bool isnull;
317 : char *collate;
318 : char *ctype;
319 : char *iculocale;
320 :
321 : /* Fetch our pg_database row normally, via syscache */
4802 rhaas 322 GIC 10213 : tup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
6184 tgl 323 CBC 10213 : if (!HeapTupleIsValid(tup))
6184 tgl 324 LBC 0 : elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
6184 tgl 325 GBC 10213 : dbform = (Form_pg_database) GETSTRUCT(tup);
8397 bruce 326 ECB :
327 : /* This recheck is strictly paranoia */
6184 tgl 328 GIC 10213 : if (strcmp(name, NameStr(dbform->datname)) != 0)
7198 tgl 329 LBC 0 : ereport(FATAL,
7198 tgl 330 EUB : (errcode(ERRCODE_UNDEFINED_DATABASE),
331 : errmsg("database \"%s\" has disappeared from pg_database",
332 : name),
333 : errdetail("Database OID %u now seems to belong to \"%s\".",
334 : MyDatabaseId, NameStr(dbform->datname))));
335 :
336 : /*
337 : * Check permissions to connect to the database.
338 : *
339 : * These checks are not enforced when in standalone mode, so that there is
340 : * a way to recover from disabling all access to all databases, for
341 : * example "UPDATE pg_database SET datallowconn = false;".
342 : *
343 : * We do not enforce them for autovacuum worker processes either.
344 : */
5897 alvherre 345 GIC 10213 : if (IsUnderPostmaster && !IsAutoVacuumWorkerProcess())
6461 tgl 346 ECB : {
347 : /*
348 : * Check that the database is currently allowing connections.
349 : */
1830 magnus 350 GIC 9883 : if (!dbform->datallowconn && !override_allow_connections)
6461 tgl 351 LBC 0 : ereport(FATAL,
6461 tgl 352 EUB : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
353 : errmsg("database \"%s\" is not currently accepting connections",
354 : name)));
355 :
356 : /*
357 : * Check privilege to connect to the database. (The am_superuser test
358 : * is redundant, but since we have the flag, might as well check it
359 : * and save a few cycles.)
360 : */
6188 tgl 361 GIC 10090 : if (!am_superuser &&
147 peter 362 GNC 207 : object_aclcheck(DatabaseRelationId, MyDatabaseId, GetUserId(),
6185 tgl 363 ECB : ACL_CONNECT) != ACLCHECK_OK)
6188 tgl 364 UIC 0 : ereport(FATAL,
6188 tgl 365 EUB : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
366 : errmsg("permission denied for database \"%s\"", name),
367 : errdetail("User does not have CONNECT privilege.")));
368 :
369 : /*
370 : * Check connection limit for this database.
371 : *
372 : * There is a race condition here --- we create our PGPROC before
373 : * checking for other PGPROCs. If two backends did this at about the
374 : * same time, they might both think they were over the limit, while
375 : * ideally one should succeed and one fail. Getting that to work
376 : * exactly seems more trouble than it is worth, however; instead we
377 : * just document that the connection limit is approximate.
378 : */
6461 tgl 379 GIC 9883 : if (dbform->datconnlimit >= 0 &&
6188 tgl 380 LBC 0 : !am_superuser &&
2258 andrew 381 UBC 0 : CountDBConnections(MyDatabaseId) > dbform->datconnlimit)
6461 tgl 382 0 : ereport(FATAL,
6461 tgl 383 EUB : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
384 : errmsg("too many connections for database \"%s\"",
385 : name)));
386 : }
387 :
388 : /*
389 : * OK, we're golden. Next to-do item is to save the encoding info out of
390 : * the pg_database tuple.
391 : */
8181 tgl 392 GIC 10213 : SetDatabaseEncoding(dbform->encoding);
7289 tgl 393 ECB : /* Record it as a GUC internal option, too */
7289 tgl 394 GIC 10213 : SetConfigOption("server_encoding", GetDatabaseEncodingName(),
305 tgl 395 ECB : PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
396 : /* If we have no other source of client_encoding, use server encoding */
7632 tgl 397 GIC 10213 : SetConfigOption("client_encoding", GetDatabaseEncodingName(),
4351 tgl 398 ECB : PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
399 :
400 : /* assign locale variables */
15 dgustafsson 401 GNC 10213 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datcollate);
437 peter 402 CBC 10213 : collate = TextDatumGetCString(datum);
15 dgustafsson 403 GNC 10213 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datctype);
437 peter 404 GIC 10213 : ctype = TextDatumGetCString(datum);
5050 bruce 405 ECB :
5023 heikki.linnakangas 406 GBC 10213 : if (pg_perm_setlocale(LC_COLLATE, collate) == NULL)
5050 bruce 407 UIC 0 : ereport(FATAL,
408 : (errmsg("database locale is incompatible with operating system"),
409 : errdetail("The database was initialized with LC_COLLATE \"%s\", "
410 : " which is not recognized by setlocale().", collate),
411 : errhint("Recreate the database with another locale or install the missing locale.")));
5050 bruce 412 ECB :
5023 heikki.linnakangas 413 GBC 10213 : if (pg_perm_setlocale(LC_CTYPE, ctype) == NULL)
5050 bruce 414 UIC 0 : ereport(FATAL,
415 : (errmsg("database locale is incompatible with operating system"),
416 : errdetail("The database was initialized with LC_CTYPE \"%s\", "
417 : " which is not recognized by setlocale().", ctype),
418 : errhint("Recreate the database with another locale or install the missing locale.")));
5050 bruce 419 ECB :
23 jdavis 420 CBC 10213 : if (strcmp(ctype, "C") == 0 ||
421 8931 : strcmp(ctype, "POSIX") == 0)
23 jdavis 422 GIC 1282 : database_ctype_is_c = true;
23 jdavis 423 ECB :
388 peter 424 GIC 10213 : if (dbform->datlocprovider == COLLPROVIDER_ICU)
425 : {
426 : char *icurules;
427 :
15 dgustafsson 428 GNC 10161 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_daticulocale);
388 peter 429 CBC 10161 : iculocale = TextDatumGetCString(datum);
430 :
32 peter 431 GNC 10161 : datum = SysCacheGetAttr(DATABASEOID, tup, Anum_pg_database_daticurules, &isnull);
432 10161 : if (!isnull)
32 peter 433 UNC 0 : icurules = TextDatumGetCString(datum);
434 : else
32 peter 435 GNC 10161 : icurules = NULL;
436 :
437 10161 : make_icu_collator(iculocale, icurules, &default_locale);
388 peter 438 ECB : }
439 : else
388 peter 440 GBC 52 : iculocale = NULL;
441 :
388 peter 442 CBC 10211 : default_locale.provider = dbform->datlocprovider;
443 :
388 peter 444 ECB : /*
445 : * Default locale is currently always deterministic. Nondeterministic
446 : * locales currently don't support pattern matching, which would break a
447 : * lot of things if applied globally.
448 : */
388 peter 449 CBC 10211 : default_locale.deterministic = true;
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 : */
419 456 10211 : datum = SysCacheGetAttr(DATABASEOID, tup, Anum_pg_database_datcollversion,
457 : &isnull);
419 peter 458 GIC 10211 : if (!isnull)
459 : {
460 : char *actual_versionstr;
461 : char *collversionstr;
462 :
419 peter 463 CBC 9904 : collversionstr = TextDatumGetCString(datum);
464 :
388 465 9904 : actual_versionstr = get_collation_actual_version(dbform->datlocprovider, dbform->datlocprovider == COLLPROVIDER_ICU ? iculocale : collate);
419 peter 466 GIC 9904 : if (!actual_versionstr)
467 : /* should not happen */
214 alvherre 468 UIC 0 : elog(WARNING,
469 : "database \"%s\" has no actual collation version, but a version was recorded",
214 alvherre 470 ECB : name);
412 peter 471 GIC 9904 : else if (strcmp(actual_versionstr, collversionstr) != 0)
419 peter 472 LBC 0 : ereport(WARNING,
419 peter 473 ECB : (errmsg("database \"%s\" has a collation version mismatch",
474 : name),
419 peter 475 EUB : errdetail("The database was created using collation version %s, "
476 : "but the operating system provides version %s.",
477 : collversionstr, actual_versionstr),
419 peter 478 ECB : errhint("Rebuild all objects in this database that use the default collation and run "
419 peter 479 EUB : "ALTER DATABASE %s REFRESH COLLATION VERSION, "
480 : "or build PostgreSQL with the right library version.",
481 : quote_identifier(name))));
482 : }
483 :
484 : /* Make the locale settings visible as GUC variables, too */
305 tgl 485 GIC 10211 : SetConfigOption("lc_collate", collate, PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
486 10211 : SetConfigOption("lc_ctype", ctype, PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
487 :
2832 noah 488 10211 : check_strxfrm_bug();
489 :
6184 tgl 490 10211 : ReleaseSysCache(tup);
8598 491 10211 : }
9644 bryanh 492 ECB :
8487 peter_e 493 :
494 : /*
4971 tgl 495 : * pg_split_opts -- split a string of options and append it to an argv array
496 : *
3146 andres 497 : * The caller is responsible for ensuring the argv array is large enough. The
498 : * maximum possible number of arguments added by this routine is
499 : * (strlen(optstr) + 1) / 2.
500 : *
501 : * Because some option values can contain spaces we allow escaping using
502 : * backslashes, with \\ representing a literal backslash.
503 : */
504 : void
2841 tgl 505 GIC 2496 : pg_split_opts(char **argv, int *argcp, const char *optstr)
506 : {
507 : StringInfoData s;
508 :
3146 andres 509 2496 : initStringInfo(&s);
510 :
4971 tgl 511 9162 : while (*optstr)
4971 tgl 512 ECB : {
3130 tgl 513 GIC 6666 : bool last_was_escape = false;
514 :
3146 andres 515 6666 : resetStringInfo(&s);
3146 andres 516 ECB :
517 : /* skip over leading space */
4971 tgl 518 CBC 12714 : while (isspace((unsigned char) *optstr))
4971 tgl 519 GIC 6048 : optstr++;
3146 andres 520 ECB :
4971 tgl 521 GIC 6666 : if (*optstr == '\0')
4971 tgl 522 LBC 0 : break;
523 :
524 : /*
2841 tgl 525 ECB : * Parse a single option, stopping at the first space, unless it's
526 : * escaped.
527 : */
3146 andres 528 CBC 99667 : while (*optstr)
3146 andres 529 EUB : {
3142 tgl 530 GIC 97171 : if (isspace((unsigned char) *optstr) && !last_was_escape)
3146 andres 531 4170 : break;
532 :
533 93001 : if (!last_was_escape && *optstr == '\\')
534 9 : last_was_escape = true;
3146 andres 535 ECB : else
536 : {
3146 andres 537 CBC 92992 : last_was_escape = false;
538 92992 : appendStringInfoChar(&s, *optstr);
539 : }
3146 andres 540 ECB :
4971 tgl 541 CBC 93001 : optstr++;
542 : }
543 :
2841 tgl 544 ECB : /* now store the option in the next argv[] position */
3146 andres 545 CBC 6666 : argv[(*argcp)++] = pstrdup(s.data);
546 : }
547 :
2841 tgl 548 2496 : pfree(s.data);
4971 tgl 549 GIC 2496 : }
550 :
551 : /*
3749 alvherre 552 ECB : * Initialize MaxBackends value from config options.
553 : *
554 : * This must be called after modules have had the chance to alter GUCs in
338 rhaas 555 : * shared_preload_libraries and before shared memory size is determined.
3749 alvherre 556 : *
557 : * Note that in EXEC_BACKEND environment, the value is passed down from
558 : * postmaster to subprocesses via BackendParameters in SubPostmasterMain; only
559 : * postmaster itself and processes not under postmaster control should call
560 : * this.
561 : */
562 : void
3749 alvherre 563 GIC 1825 : InitializeMaxBackends(void)
564 : {
362 rhaas 565 1825 : Assert(MaxBackends == 0);
566 :
567 : /* the extra unit accounts for the autovacuum launcher */
568 1825 : MaxBackends = MaxConnections + autovacuum_max_workers + 1 +
569 1825 : max_worker_processes + max_wal_senders;
3749 alvherre 570 ECB :
571 : /* internal error because the values were all checked previously */
362 rhaas 572 CBC 1825 : if (MaxBackends > MAX_BACKENDS)
3749 alvherre 573 UIC 0 : elog(ERROR, "too many backends configured");
3749 alvherre 574 GIC 1825 : }
4971 tgl 575 ECB :
576 : /*
577 : * GUC check_hook for max_connections
578 : */
579 : bool
208 tgl 580 GNC 4054 : check_max_connections(int *newval, void **extra, GucSource source)
581 : {
582 4054 : if (*newval + autovacuum_max_workers + 1 +
583 4054 : max_worker_processes + max_wal_senders > MAX_BACKENDS)
208 tgl 584 UNC 0 : return false;
208 tgl 585 GNC 4054 : return true;
586 : }
587 :
588 : /*
589 : * GUC check_hook for autovacuum_max_workers
590 : */
591 : bool
592 1857 : check_autovacuum_max_workers(int *newval, void **extra, GucSource source)
593 : {
594 1857 : if (MaxConnections + *newval + 1 +
595 1857 : max_worker_processes + max_wal_senders > MAX_BACKENDS)
208 tgl 596 UNC 0 : return false;
208 tgl 597 GNC 1857 : return true;
598 : }
599 :
600 : /*
601 : * GUC check_hook for max_worker_processes
602 : */
603 : bool
604 1857 : check_max_worker_processes(int *newval, void **extra, GucSource source)
605 : {
606 1857 : if (MaxConnections + autovacuum_max_workers + 1 +
607 1857 : *newval + max_wal_senders > MAX_BACKENDS)
208 tgl 608 UNC 0 : return false;
208 tgl 609 GNC 1857 : return true;
610 : }
611 :
612 : /*
613 : * GUC check_hook for max_wal_senders
614 : */
615 : bool
616 2714 : check_max_wal_senders(int *newval, void **extra, GucSource source)
617 : {
618 2714 : if (MaxConnections + autovacuum_max_workers + 1 +
619 2714 : max_worker_processes + *newval > MAX_BACKENDS)
208 tgl 620 UNC 0 : return false;
208 tgl 621 GNC 2714 : return true;
622 : }
623 :
8147 tgl 624 ECB : /*
625 : * Early initialization of a backend (either standalone or under postmaster).
626 : * This happens even before InitPostgres.
7967 627 : *
4737 tgl 628 EUB : * This is separate from InitPostgres because it is also called by auxiliary
4737 tgl 629 ECB : * processes, such as the background writer process, which may not call
630 : * InitPostgres at all.
631 : */
632 : void
8147 tgl 633 GIC 13373 : BaseInit(void)
634 : {
612 andres 635 CBC 13373 : Assert(MyProc != NULL);
636 :
8147 tgl 637 ECB : /*
612 andres 638 : * Initialize our input/output/debugging file descriptors.
8147 tgl 639 EUB : */
8147 tgl 640 CBC 13373 : DebugFileOpen();
641 :
642 : /*
643 : * Initialize file access. Done early so other subsystems can access
644 : * files.
645 : */
610 andres 646 GIC 13373 : InitFileAccess();
610 andres 647 ECB :
648 : /*
611 649 : * Initialize statistics reporting. This needs to happen early to ensure
650 : * that pgstat's shutdown callback runs after the shutdown callbacks of
611 andres 651 EUB : * all subsystems that can produce stats (like e.g. transaction commits
611 andres 652 ECB : * can).
653 : */
611 andres 654 GIC 13373 : pgstat_initialize();
655 :
656 : /* Do local initialization of storage and buffer managers */
1466 tmunro 657 13373 : InitSync();
8147 tgl 658 13373 : smgrinit();
8147 tgl 659 CBC 13373 : InitBufferPoolAccess();
660 :
610 andres 661 ECB : /*
604 662 : * Initialize temporary file access after pgstat, so that the temporary
610 andres 663 EUB : * file shutdown hook can report temporary file statistics.
610 andres 664 ECB : */
610 andres 665 GIC 13373 : InitTemporaryFileAccess();
666 :
667 : /*
668 : * Initialize local buffers for WAL record construction, in case we ever
669 : * try to insert XLOG.
670 : */
509 rhaas 671 CBC 13373 : InitXLogInsert();
672 :
419 andres 673 ECB : /*
674 : * Initialize replication slots after pgstat. The exit hook might need to
419 andres 675 EUB : * drop ephemeral slots, which in turn triggers stats reporting.
419 andres 676 ECB : */
419 andres 677 GIC 13373 : ReplicationSlotInitialize();
8147 tgl 678 13373 : }
679 :
680 :
681 : /* --------------------------------
682 : * InitPostgres
683 : * Initialize POSTGRES.
684 : *
685 : * Parameters:
686 : * in_dbname, dboid: specify database to connect to, as described below
687 : * username, useroid: specify role to connect as, as described below
258 tgl 688 ECB : * load_session_libraries: TRUE to honor [session|local]_preload_libraries
689 : * override_allow_connections: TRUE to connect despite !datallowconn
690 : * out_dbname: optional output parameter, see below; pass NULL if not used
691 : *
692 : * The database can be specified by name, using the in_dbname parameter, or by
693 : * OID, using the dboid parameter. Specify NULL or InvalidOid respectively
694 : * for the unused parameter. If dboid is provided, the actual database
4988 695 : * name can be returned to the caller in out_dbname. If out_dbname isn't
696 : * NULL, it must point to a buffer of size NAMEDATALEN.
697 : *
698 : * Similarly, the role can be passed by name, using the username parameter,
699 : * or by OID using the useroid parameter.
700 : *
258 701 : * In bootstrap mode the database and username parameters are NULL/InvalidOid.
702 : * The autovacuum launcher process doesn't specify these parameters either,
703 : * because it only goes far enough to be able to read pg_database; it doesn't
704 : * connect to any particular database. An autovacuum worker specifies a
705 : * database but not a username; conversely, a physical walsender specifies
706 : * username but not database.
707 : *
708 : * By convention, load_session_libraries should be passed as true in
709 : * "interactive" sessions (including standalone backends), but false in
710 : * background processes such as autovacuum. Note in particular that it
711 : * shouldn't be true in parallel worker processes; those have another
712 : * mechanism for replicating their leader's set of loaded libraries.
6720 713 : *
258 714 : * We expect that InitProcess() was already called, so we already have a
715 : * PGPROC struct ... but it's not completely filled in yet.
716 : *
717 : * Note:
718 : * Be very careful with the order of calls in the InitPostgres function.
719 : * --------------------------------
9770 scrappy 720 : */
721 : void
258 tgl 722 GIC 11577 : InitPostgres(const char *in_dbname, Oid dboid,
723 : const char *username, Oid useroid,
724 : bool load_session_libraries,
725 : bool override_allow_connections,
258 tgl 726 ECB : char *out_dbname)
727 : {
8487 peter_e 728 GIC 11577 : bool bootstrap = IsBootstrapProcessingMode();
729 : bool am_superuser;
730 : char *fullpath;
731 : char dbname[NAMEDATALEN];
79 rhaas 732 GNC 11577 : int nfree = 0;
9345 bruce 733 ECB :
4971 tgl 734 CBC 11577 : 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 : */
6304 tgl 741 GIC 11577 : InitProcessPhase2();
742 :
743 : /*
744 : * Initialize my entry in the shared-invalidation manager's array of
745 : * per-backend data.
746 : *
747 : * Sets up MyBackendId, a unique backend identifier.
748 : */
7967 749 11577 : MyBackendId = InvalidBackendId;
750 :
4859 simon 751 11577 : SharedInvalBackendInit(false);
752 :
362 rhaas 753 11577 : if (MyBackendId > MaxBackends || MyBackendId <= 0)
4312 peter_e 754 UIC 0 : elog(FATAL, "bad backend ID: %d", MyBackendId);
755 :
756 : /* Now that we have a BackendId, we can participate in ProcSignal */
5000 tgl 757 GIC 11577 : ProcSignalInit(MyBackendId);
758 :
759 : /*
760 : * Also set up timeout handlers needed for backend operation. We need
761 : * these in every case except bootstrap.
762 : */
3919 alvherre 763 11577 : if (!bootstrap)
764 : {
2987 andres 765 11272 : RegisterTimeout(DEADLOCK_TIMEOUT, CheckDeadLockAlert);
3919 alvherre 766 11272 : RegisterTimeout(STATEMENT_TIMEOUT, StatementTimeoutHandler);
3676 tgl 767 11272 : RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
2580 rhaas 768 11272 : RegisterTimeout(IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
769 : IdleInTransactionSessionTimeoutHandler);
823 tgl 770 11272 : RegisterTimeout(IDLE_SESSION_TIMEOUT, IdleSessionTimeoutHandler);
736 tmunro 771 11272 : RegisterTimeout(CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler);
368 andres 772 11272 : RegisterTimeout(IDLE_STATS_UPDATE_TIMEOUT,
773 : IdleStatsUpdateTimeoutHandler);
774 : }
775 :
776 : /*
777 : * If this is either a bootstrap process or a standalone backend, start up
332 tgl 778 ECB : * the XLOG machinery, and register to have it closed down at exit. In
779 : * other cases, the startup process is responsible for starting up the
780 : * XLOG machinery, and the checkpointer for closing it down.
781 : */
482 rhaas 782 GIC 11577 : if (!IsUnderPostmaster)
783 : {
4737 tgl 784 ECB : /*
785 : * We don't yet have an aux-process resource owner, but StartupXLOG
786 : * and ShutdownXLOG will need one. Hence, create said resource owner
787 : * (and register a callback to clean it up after ShutdownXLOG runs).
788 : */
1726 tgl 789 GIC 619 : CreateAuxProcessResourceOwner();
1726 tgl 790 ECB :
4737 tgl 791 GIC 619 : StartupXLOG();
792 : /* Release (and warn about) any buffer pins leaked in StartupXLOG */
1726 793 619 : ReleaseAuxProcessResources(true);
794 : /* Reset CurrentResourceOwner to nothing for the moment */
795 619 : CurrentResourceOwner = NULL;
796 :
744 andres 797 ECB : /*
798 : * Use before_shmem_exit() so that ShutdownXLOG() can rely on DSM
799 : * segments etc to work (which in turn is required for pgstats).
800 : */
368 andres 801 GIC 619 : before_shmem_exit(pgstat_before_server_shutdown, 0);
744 802 619 : before_shmem_exit(ShutdownXLOG, 0);
803 : }
804 :
9345 bruce 805 ECB : /*
806 : * Initialize the relation cache and the system catalog caches. Note that
6184 tgl 807 : * no catalog access happens here; we only set up the hashtable structure.
808 : * We must do this before starting a transaction because transaction abort
6031 bruce 809 : * would try to touch these hashtables.
9345 bruce 810 EUB : */
7897 tgl 811 GIC 11577 : RelationCacheInitialize();
9345 bruce 812 11577 : InitCatalogCache();
5871 tgl 813 CBC 11577 : InitPlanCache();
814 :
815 : /* Initialize portal manager */
7967 tgl 816 GIC 11577 : EnablePortalManager();
817 :
818 : /* Initialize status reporting */
506 andres 819 CBC 11577 : pgstat_beinit();
820 :
4969 tgl 821 ECB : /*
4790 bruce 822 : * Load relcache entries for the shared system catalogs. This must create
4737 tgl 823 : * at least entries for pg_database and catalogs used for authentication.
4969 824 : */
4969 tgl 825 GIC 11577 : RelationCacheInitializePhase2();
4969 tgl 826 ECB :
6450 827 : /*
3399 rhaas 828 : * Set up process-exit callback to do pre-shutdown cleanup. This is the
829 : * one of the first before_shmem_exit callbacks we register; thus, this
830 : * will be one the last things we do before low-level modules like the
831 : * buffer manager begin to close down. We need to have this in place
832 : * before we begin our first transaction --- if we fail during the
833 : * initialization transaction, as is entirely possible, we need the
834 : * AbortTransaction call to clean up.
835 : */
3399 rhaas 836 GIC 11577 : before_shmem_exit(ShutdownPostgres, 0);
837 :
4969 tgl 838 ECB : /* The autovacuum launcher is done here */
4969 tgl 839 GIC 11577 : if (IsAutoVacuumLauncherProcess())
840 : {
841 : /* report this backend in the PgBackendStatus array */
2205 rhaas 842 306 : pgstat_bestart();
843 :
4968 tgl 844 979 : return;
2205 rhaas 845 ECB : }
846 :
6184 tgl 847 : /*
848 : * Start a new transaction here before first access to db, and get a
5323 alvherre 849 : * snapshot. We don't have a use for the snapshot itself, but we're
850 : * interested in the secondary effect that it sets RecentGlobalXmin. (This
4790 bruce 851 : * is critical for anything that reads heap pages, because HOT may decide
852 : * to prune them even if the process doesn't attempt to modify any
853 : * tuples.)
854 : *
855 : * FIXME: This comment is inaccurate / the code buggy. A snapshot that is
856 : * not pushed/active does not reliably prevent HOT pruning (->xmin could
970 andres 857 : * e.g. be cleared when cache invalidations are processed).
6184 tgl 858 : */
8509 inoue 859 GIC 11271 : if (!bootstrap)
860 : {
861 : /* statement_timestamp must be set for timeouts to work correctly */
4257 tgl 862 10966 : SetCurrentStatementStartTimestamp();
7270 863 10966 : StartTransactionCommand();
864 :
865 : /*
866 : * transaction_isolation will have been set to the default by the
3880 tgl 867 ECB : * above. If the default is "serializable", and we are in hot
868 : * standby, we will fail if we don't change it to something lower.
869 : * Fortunately, "read committed" is plenty good enough.
870 : */
3880 tgl 871 GIC 10966 : XactIsoLevel = XACT_READ_COMMITTED;
3880 tgl 872 ECB :
5323 alvherre 873 GIC 10966 : (void) GetTransactionSnapshot();
874 : }
8487 peter_e 875 ECB :
876 : /*
877 : * Perform client authentication if necessary, then figure out our
878 : * postgres user ID, and see if we are a superuser.
879 : *
880 : * In standalone mode and in autovacuum worker processes, we use a fixed
4737 tgl 881 : * ID, otherwise we figure it out from the authenticated user name.
882 : */
4737 tgl 883 GIC 11271 : if (bootstrap || IsAutoVacuumWorkerProcess())
884 : {
885 321 : InitializeSessionUserIdStandalone();
886 321 : am_superuser = true;
887 : }
888 10950 : else if (!IsUnderPostmaster)
889 : {
890 314 : InitializeSessionUserIdStandalone();
891 314 : am_superuser = true;
4737 tgl 892 CBC 314 : if (!ThereIsAtLeastOneRole())
4737 tgl 893 UIC 0 : ereport(WARNING,
894 : (errcode(ERRCODE_UNDEFINED_OBJECT),
4737 tgl 895 ECB : errmsg("no roles are defined in this database system"),
896 : errhint("You should immediately run CREATE USER \"%s\" SUPERUSER;.",
897 : username != NULL ? username : "postgres")));
898 : }
3776 alvherre 899 GIC 10636 : else if (IsBackgroundWorker)
3776 alvherre 900 ECB : {
2988 rhaas 901 GIC 1941 : if (username == NULL && !OidIsValid(useroid))
902 : {
3776 alvherre 903 326 : InitializeSessionUserIdStandalone();
904 326 : am_superuser = true;
905 : }
906 : else
907 : {
2988 rhaas 908 1615 : InitializeSessionUserId(username, useroid);
3776 alvherre 909 1615 : am_superuser = superuser();
910 : }
911 : }
912 : else
913 : {
914 : /* normal multiuser case */
4737 tgl 915 CBC 8695 : Assert(MyProcPort != NULL);
4737 tgl 916 GIC 8695 : PerformAuthentication(MyProcPort);
2988 rhaas 917 8628 : InitializeSessionUserId(username, useroid);
918 : /* ensure that auth_method is actually valid, aka authn_id is not NULL */
192 michael 919 GNC 8624 : if (MyClientConnectionInfo.authn_id)
920 115 : InitializeSystemUser(MyClientConnectionInfo.authn_id,
921 : hba_authname(MyClientConnectionInfo.auth_method));
4737 tgl 922 CBC 8624 : am_superuser = superuser();
4737 tgl 923 ECB : }
924 :
925 : /*
926 : * Binary upgrades only allowed super-user connections
927 : */
4367 bruce 928 GIC 11200 : if (IsBinaryUpgrade && !am_superuser)
929 : {
4322 bruce 930 UIC 0 : ereport(FATAL,
4322 bruce 931 ECB : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
932 : errmsg("must be superuser to connect in binary upgrade mode")));
4367 933 : }
934 :
935 : /*
936 : * The last few connection slots are reserved for superusers and roles with
937 : * privileges of pg_use_reserved_connections. Replication connections are
938 : * drawn from slots reserved with max_wal_senders and are not limited by
939 : * max_connections, superuser_reserved_connections, or
940 : * reserved_connections.
941 : *
942 : * Note: At this point, the new backend has already claimed a proc struct,
943 : * so we must check whether the number of free slots is strictly less than
944 : * the reserved connection limits.
945 : */
1517 michael 946 GIC 11200 : if (!am_superuser && !am_walsender &&
79 rhaas 947 GNC 205 : (SuperuserReservedConnections + ReservedConnections) > 0 &&
948 205 : !HaveNFreeProcs(SuperuserReservedConnections + ReservedConnections, &nfree))
949 : {
79 rhaas 950 UNC 0 : if (nfree < SuperuserReservedConnections)
951 0 : ereport(FATAL,
952 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
953 : errmsg("remaining connection slots are reserved for roles with %s",
954 : "SUPERUSER")));
955 :
956 0 : if (!has_privs_of_role(GetUserId(), ROLE_PG_USE_RESERVED_CONNECTIONS))
957 0 : ereport(FATAL,
958 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
959 : errmsg("remaining connection slots are reserved for roles with privileges of the \"%s\" role",
960 : "pg_use_reserved_connections")));
961 : }
4731 rhaas 962 ECB :
963 : /* Check replication permissions needed for walsender processes. */
4737 tgl 964 CBC 11200 : if (am_walsender)
965 : {
966 835 : Assert(!bootstrap);
4591 heikki.linnakangas 967 ECB :
24 peter 968 GNC 835 : if (!has_rolreplication(GetUserId()))
4736 tgl 969 UBC 0 : ereport(FATAL,
970 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
971 : errmsg("permission denied to start WAL sender"),
972 : errdetail("Only roles with the %s attribute may start a WAL sender process.",
973 : "REPLICATION")));
974 : }
975 :
976 : /*
3317 rhaas 977 ECB : * If this is a plain walsender only supporting physical replication, we
978 : * don't want to connect to any particular database. Just finish the
979 : * backend startup by processing any options from the startup packet, and
980 : * we're done.
981 : */
3317 rhaas 982 CBC 11200 : if (am_walsender && !am_db_walsender)
983 : {
984 : /* process any options passed in the startup packet */
4591 heikki.linnakangas 985 GIC 351 : if (MyProcPort != NULL)
4591 heikki.linnakangas 986 CBC 351 : process_startup_options(MyProcPort, am_superuser);
4591 heikki.linnakangas 987 ECB :
988 : /* Apply PostAuthDelay as soon as we've read all options */
4591 heikki.linnakangas 989 GIC 351 : if (PostAuthDelay > 0)
4591 heikki.linnakangas 990 UIC 0 : pg_usleep(PostAuthDelay * 1000000L);
991 :
992 : /* initialize client encoding */
4591 heikki.linnakangas 993 CBC 351 : InitializeClientEncoding();
4591 heikki.linnakangas 994 ECB :
4737 tgl 995 : /* report this backend in the PgBackendStatus array */
4737 tgl 996 GIC 351 : pgstat_bestart();
4591 heikki.linnakangas 997 ECB :
4737 tgl 998 : /* close the transaction we started above */
4737 tgl 999 GIC 351 : CommitTransactionCommand();
4591 heikki.linnakangas 1000 ECB :
4737 tgl 1001 GIC 351 : return;
1002 : }
1003 :
1004 : /*
1005 : * Set up the global variables holding database id and default tablespace.
4988 tgl 1006 ECB : * But note we won't actually try to touch the database just yet.
1007 : *
4737 tgl 1008 EUB : * We take a shortcut in the bootstrap case, otherwise we have to look up
1009 : * the db's entry in pg_database.
1010 : */
4737 tgl 1011 GIC 10849 : if (bootstrap)
1012 : {
353 1013 305 : MyDatabaseId = Template1DbOid;
4988 1014 305 : MyDatabaseTableSpace = DEFAULTTABLESPACE_OID;
1015 : }
1016 10544 : else if (in_dbname != NULL)
1017 : {
1018 : HeapTuple tuple;
1019 : Form_pg_database dbform;
1020 :
1021 8590 : tuple = GetDatabaseTuple(in_dbname);
1022 8590 : if (!HeapTupleIsValid(tuple))
1023 7 : ereport(FATAL,
4988 tgl 1024 ECB : (errcode(ERRCODE_UNDEFINED_DATABASE),
1025 : errmsg("database \"%s\" does not exist", in_dbname)));
4988 tgl 1026 CBC 8583 : dbform = (Form_pg_database) GETSTRUCT(tuple);
1601 andres 1027 GIC 8583 : MyDatabaseId = dbform->oid;
4988 tgl 1028 GBC 8583 : MyDatabaseTableSpace = dbform->dattablespace;
4988 tgl 1029 EUB : /* take database name from the caller, just for paranoia */
4988 tgl 1030 GIC 8583 : strlcpy(dbname, in_dbname, sizeof(dbname));
1031 : }
2845 rhaas 1032 1954 : else if (OidIsValid(dboid))
1033 : {
4988 tgl 1034 EUB : /* caller specified database by OID */
4790 bruce 1035 : HeapTuple tuple;
1036 : Form_pg_database dbform;
1037 :
4988 tgl 1038 GIC 1632 : tuple = GetDatabaseTupleByOid(dboid);
1039 1632 : if (!HeapTupleIsValid(tuple))
4988 tgl 1040 UIC 0 : ereport(FATAL,
1041 : (errcode(ERRCODE_UNDEFINED_DATABASE),
4988 tgl 1042 ECB : errmsg("database %u does not exist", dboid)));
4988 tgl 1043 GIC 1632 : dbform = (Form_pg_database) GETSTRUCT(tuple);
1601 andres 1044 CBC 1632 : MyDatabaseId = dbform->oid;
4988 tgl 1045 GIC 1632 : MyDatabaseTableSpace = dbform->dattablespace;
4988 tgl 1046 CBC 1632 : Assert(MyDatabaseId == dboid);
4988 tgl 1047 GBC 1632 : strlcpy(dbname, NameStr(dbform->datname), sizeof(dbname));
1048 : /* pass the database name back to the caller */
4988 tgl 1049 GIC 1632 : if (out_dbname)
1050 16 : strcpy(out_dbname, dbname);
1051 : }
1052 : else
1053 : {
1054 : /*
1055 : * If this is a background worker not bound to any particular
1056 : * database, we're done now. Everything that follows only makes sense
1057 : * if we are bound to a specific database. We do need to close the
1058 : * transaction we started before returning.
1059 : */
2845 rhaas 1060 CBC 322 : if (!bootstrap)
1061 : {
2205 rhaas 1062 GIC 322 : pgstat_bestart();
2845 rhaas 1063 CBC 322 : CommitTransactionCommand();
2205 rhaas 1064 ECB : }
2845 rhaas 1065 GIC 322 : return;
1066 : }
4988 tgl 1067 ECB :
4988 tgl 1068 EUB : /*
1069 : * Now, take a writer's lock on the database we are trying to connect to.
1070 : * If there is a concurrently running DROP DATABASE on that database, this
4790 bruce 1071 ECB : * will block us until it finishes (and has committed its update of
1072 : * pg_database).
1073 : *
6031 1074 : * Note that the lock is not held long, only until the end of this startup
1075 : * transaction. This is OK since we will advertise our use of the
1076 : * database in the ProcArray before dropping the lock (in fact, that's the
2865 tgl 1077 : * next thing to do). Anyone trying a DROP DATABASE after this point will
1078 : * see us in the array once they have the lock. Ordering is important for
1079 : * this because we don't want to advertise ourselves as being in this
1080 : * database until we have the lock; otherwise we create what amounts to a
1081 : * deadlock with CountOtherDBBackends().
1082 : *
1083 : * Note: use of RowExclusiveLock here is reasonable because we envision
1084 : * our session as being a concurrent writer of the database. If we had a
1085 : * way of declaring a session as being guaranteed-read-only, we could use
1086 : * AccessShareLock for such sessions and thereby not conflict against
1087 : * CREATE DATABASE.
1088 : */
4737 tgl 1089 CBC 10520 : if (!bootstrap)
6184 tgl 1090 GIC 10215 : LockSharedObject(DatabaseRelationId, MyDatabaseId, 0,
6184 tgl 1091 ECB : RowExclusiveLock);
1092 :
1093 : /*
2865 1094 : * Now we can mark our PGPROC entry with the database ID.
1095 : *
1096 : * We assume this is an atomic store so no lock is needed; though actually
1097 : * things would work fine even if it weren't atomic. Anyone searching the
1098 : * ProcArray for this database's ID should hold the database lock, so they
1099 : * would not be executing concurrently with this store. A process looking
1100 : * for another database's ID could in theory see a chance match if it read
1101 : * a partially-updated databaseId value; but as long as all such searches
1102 : * wait and retry, as in CountOtherDBBackends(), they will certainly see
1103 : * the correct value on their next try.
1104 : */
2865 tgl 1105 CBC 10520 : MyProc->databaseId = MyDatabaseId;
2865 tgl 1106 ECB :
1107 : /*
1108 : * We established a catalog snapshot while reading pg_authid and/or
1109 : * pg_database; but until we have set up MyDatabaseId, we won't react to
1110 : * incoming sinval messages for unshared catalogs, so we won't realize it
1111 : * if the snapshot has been invalidated. Assume it's no good anymore.
1112 : */
2865 tgl 1113 GIC 10520 : InvalidateCatalogSnapshot();
1114 :
1115 : /*
4988 tgl 1116 ECB : * Recheck pg_database to make sure the target database hasn't gone away.
1117 : * If there was a concurrent DROP DATABASE, this ensures we will die
4988 tgl 1118 EUB : * cleanly without creating a mess.
1119 : */
4737 tgl 1120 GIC 10520 : if (!bootstrap)
6184 tgl 1121 ECB : {
4790 bruce 1122 : HeapTuple tuple;
6184 tgl 1123 :
4988 tgl 1124 CBC 10215 : tuple = GetDatabaseTuple(dbname);
1125 10215 : if (!HeapTupleIsValid(tuple) ||
1601 andres 1126 GIC 10215 : MyDatabaseId != ((Form_pg_database) GETSTRUCT(tuple))->oid ||
4988 tgl 1127 CBC 10215 : MyDatabaseTableSpace != ((Form_pg_database) GETSTRUCT(tuple))->dattablespace)
6184 tgl 1128 LBC 0 : ereport(FATAL,
1129 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1130 : errmsg("database \"%s\" does not exist", dbname),
1131 : errdetail("It seems to have just been dropped or renamed.")));
1132 : }
1133 :
1134 : /*
1135 : * Now we should be able to access the database directory safely. Verify
1136 : * it's there and looks reasonable.
1137 : */
4988 tgl 1138 CBC 10520 : fullpath = GetDatabasePath(MyDatabaseId, MyDatabaseTableSpace);
1139 :
4737 1140 10520 : if (!bootstrap)
6184 tgl 1141 ECB : {
6184 tgl 1142 GIC 10215 : if (access(fullpath, F_OK) == -1)
6184 tgl 1143 ECB : {
6184 tgl 1144 UIC 0 : if (errno == ENOENT)
1145 0 : ereport(FATAL,
1146 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1147 : errmsg("database \"%s\" does not exist",
1148 : dbname),
1149 : errdetail("The database subdirectory \"%s\" is missing.",
1150 : fullpath)));
1151 : else
1152 0 : ereport(FATAL,
1153 : (errcode_for_file_access(),
1154 : errmsg("could not access directory \"%s\": %m",
1155 : fullpath)));
1156 : }
1157 :
6184 tgl 1158 GIC 10215 : ValidatePgVersion(fullpath);
1159 : }
1160 :
4988 1161 10520 : SetDatabasePath(fullpath);
349 alvherre 1162 10520 : pfree(fullpath);
1163 :
1164 : /*
1165 : * It's now possible to do real access to the system catalogs.
1166 : *
6184 tgl 1167 ECB : * Load relcache entries for the system catalogs. This must create at
1168 : * least the minimum set of "nailed-in" cache entries.
1169 : */
4988 tgl 1170 GIC 10520 : RelationCacheInitializePhase3();
1171 :
1172 : /* set up ACL framework (so CheckMyDatabase can check permissions) */
6188 1173 10518 : initialize_acl();
1174 :
1175 : /*
1176 : * Re-read the pg_database row for our database, check permissions and set
1177 : * up database-specific GUC settings. We can't do this until all the
1178 : * database-access infrastructure is up. (Also, it wants to know if the
1179 : * user is a superuser, so the above stuff has to happen first.)
1180 : */
4737 1181 10518 : if (!bootstrap)
1830 magnus 1182 10213 : CheckMyDatabase(dbname, am_superuser, override_allow_connections);
8586 vadim4o 1183 ECB :
1184 : /*
1185 : * Now process any command-line switches and any additional GUC variable
1186 : * settings passed in the startup packet. We couldn't do this before
1187 : * because we didn't know if client is a superuser.
1188 : */
4591 heikki.linnakangas 1189 GIC 10516 : if (MyProcPort != NULL)
1190 8268 : process_startup_options(MyProcPort, am_superuser);
4591 heikki.linnakangas 1191 ECB :
1192 : /* Process pg_db_role_setting options */
4591 heikki.linnakangas 1193 GIC 10516 : process_settings(MyDatabaseId, GetSessionUserId());
1194 :
1195 : /* Apply PostAuthDelay as soon as we've read all options */
1196 10515 : if (PostAuthDelay > 0)
4591 heikki.linnakangas 1197 UIC 0 : pg_usleep(PostAuthDelay * 1000000L);
4591 heikki.linnakangas 1198 ECB :
1199 : /*
1200 : * Initialize various default states that can't be set up until we've
1201 : * selected the active user and gotten the right GUC settings.
1202 : */
1203 :
1204 : /* set default namespace search path */
4591 heikki.linnakangas 1205 CBC 10515 : InitializeSearchPath();
4591 heikki.linnakangas 1206 EUB :
1207 : /* initialize client encoding */
4591 heikki.linnakangas 1208 GIC 10515 : InitializeClientEncoding();
1209 :
1210 : /* Initialize this backend's session state. */
2033 andres 1211 10515 : InitializeSession();
1212 :
1213 : /*
1214 : * If this is an interactive session, load any libraries that should be
1215 : * preloaded at backend start. Since those are determined by GUCs, this
258 tgl 1216 ECB : * can't happen until GUC settings are complete, but we want it to happen
1217 : * during the initial transaction in case anything that requires database
1218 : * access needs to be done.
1219 : */
258 tgl 1220 CBC 10515 : if (load_session_libraries)
258 tgl 1221 GIC 8096 : process_session_preload_libraries();
258 tgl 1222 EUB :
4591 heikki.linnakangas 1223 : /* report this backend in the PgBackendStatus array */
4591 heikki.linnakangas 1224 GIC 10515 : if (!bootstrap)
1225 10210 : pgstat_bestart();
1226 :
1227 : /* close the transaction we started above */
1228 10515 : if (!bootstrap)
1229 10210 : CommitTransactionCommand();
4591 heikki.linnakangas 1230 EUB : }
1231 :
1232 : /*
1233 : * Process any command-line switches and any additional GUC variable
1234 : * settings passed in the startup packet.
1235 : */
4591 heikki.linnakangas 1236 ECB : static void
4591 heikki.linnakangas 1237 GIC 8619 : process_startup_options(Port *port, bool am_superuser)
1238 : {
4591 heikki.linnakangas 1239 ECB : GucContext gucctx;
1240 : ListCell *gucopts;
1241 :
3130 tgl 1242 GIC 8619 : gucctx = am_superuser ? PGC_SU_BACKEND : PGC_BACKEND;
1243 :
1244 : /*
1245 : * First process any command-line switches that were included in the
1246 : * startup packet, if we are in a regular backend.
1247 : */
4591 heikki.linnakangas 1248 CBC 8619 : if (port->cmdline_options != NULL)
1249 : {
1250 : /*
4968 tgl 1251 ECB : * The maximum possible number of commandline arguments that could
1252 : * come from port->cmdline_options is (strlen + 1) / 2; see
1253 : * pg_split_opts().
1254 : */
1255 : char **av;
1256 : int maxac;
1257 : int ac;
1258 :
4591 heikki.linnakangas 1259 CBC 2496 : maxac = 2 + (strlen(port->cmdline_options) + 1) / 2;
4968 tgl 1260 ECB :
4968 tgl 1261 GIC 2496 : av = (char **) palloc(maxac * sizeof(char *));
1262 2496 : ac = 0;
1263 :
1264 2496 : av[ac++] = "postgres";
1265 :
4591 heikki.linnakangas 1266 2496 : pg_split_opts(av, &ac, port->cmdline_options);
4968 tgl 1267 ECB :
4968 tgl 1268 CBC 2496 : av[ac] = NULL;
1269 :
4968 tgl 1270 GIC 2496 : Assert(ac < maxac);
4968 tgl 1271 ECB :
3660 tgl 1272 GIC 2496 : (void) process_postgres_switches(ac, av, gucctx, NULL);
1273 : }
4968 tgl 1274 ECB :
4968 tgl 1275 EUB : /*
1276 : * Process any additional GUC variable settings passed in startup packet.
1277 : * These are handled exactly like command-line variables.
1278 : */
4591 heikki.linnakangas 1279 GIC 8619 : gucopts = list_head(port->guc_options);
1280 21573 : while (gucopts)
1281 : {
1282 : char *name;
4591 heikki.linnakangas 1283 ECB : char *value;
1284 :
4591 heikki.linnakangas 1285 GIC 12954 : name = lfirst(gucopts);
1364 tgl 1286 CBC 12954 : gucopts = lnext(port->guc_options, gucopts);
1287 :
4591 heikki.linnakangas 1288 GIC 12954 : value = lfirst(gucopts);
1364 tgl 1289 CBC 12954 : gucopts = lnext(port->guc_options, gucopts);
1290 :
4591 heikki.linnakangas 1291 GIC 12954 : SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
1292 : }
8147 tgl 1293 8619 : }
1294 :
1295 : /*
1296 : * Load GUC settings from pg_db_role_setting.
1297 : *
4932 alvherre 1298 ECB : * We try specific settings for the database/role combination, as well as
1299 : * general for this database and for this user.
1300 : */
1301 : static void
4932 alvherre 1302 CBC 10516 : process_settings(Oid databaseid, Oid roleid)
4932 alvherre 1303 ECB : {
1304 : Relation relsetting;
1305 : Snapshot snapshot;
1306 :
4932 alvherre 1307 CBC 10516 : if (!IsUnderPostmaster)
4932 alvherre 1308 GIC 617 : return;
1309 :
1539 andres 1310 9899 : relsetting = table_open(DbRoleSettingRelationId, AccessShareLock);
1311 :
1312 : /* read all the settings under the same snapshot for efficiency */
3568 rhaas 1313 9899 : snapshot = RegisterSnapshot(GetCatalogSnapshot(DbRoleSettingRelationId));
1314 :
4811 bruce 1315 ECB : /* Later settings are ignored if set earlier. */
3568 rhaas 1316 GIC 9899 : ApplySetting(snapshot, databaseid, roleid, relsetting, PGC_S_DATABASE_USER);
1317 9898 : ApplySetting(snapshot, InvalidOid, roleid, relsetting, PGC_S_USER);
1318 9898 : ApplySetting(snapshot, databaseid, InvalidOid, relsetting, PGC_S_DATABASE);
1319 9898 : ApplySetting(snapshot, InvalidOid, InvalidOid, relsetting, PGC_S_GLOBAL);
4932 alvherre 1320 ECB :
3568 rhaas 1321 GIC 9898 : UnregisterSnapshot(snapshot);
1539 andres 1322 9898 : table_close(relsetting, AccessShareLock);
1323 : }
1324 :
1325 : /*
8147 tgl 1326 ECB : * Backend-shutdown callback. Do cleanup that we want to be sure happens
1327 : * before all the supporting modules begin to nail their doors shut via
1328 : * their own callbacks.
1329 : *
1330 : * User-level cleanup, such as temp-relation removal and UNLISTEN, happens
1331 : * via separate callbacks that execute before this one. We don't combine the
1332 : * callbacks because we still want this one to happen if the user-level
1333 : * cleanup fails.
1334 : */
1335 : static void
7058 peter_e 1336 GIC 11577 : ShutdownPostgres(int code, Datum arg)
8147 tgl 1337 ECB : {
1338 : /* Make sure we've killed any active transaction */
6453 tgl 1339 CBC 11577 : AbortOutOfAnyTransaction();
8053 bruce 1340 ECB :
1341 : /*
6385 1342 : * User locks are not released by transaction end, so be sure to release
1343 : * them explicitly.
8147 tgl 1344 : */
6453 tgl 1345 GIC 11577 : LockReleaseAll(USER_LOCKMETHOD, true);
8586 vadim4o 1346 CBC 11577 : }
1347 :
7883 peter_e 1348 ECB :
1349 : /*
3919 alvherre 1350 : * STATEMENT_TIMEOUT handler: trigger a query-cancel interrupt.
1351 : */
1352 : static void
3919 alvherre 1353 GIC 5 : StatementTimeoutHandler(void)
1354 : {
2878 bruce 1355 5 : int sig = SIGINT;
1356 :
2987 andres 1357 ECB : /*
1358 : * During authentication the timeout is used to deal with
1359 : * authentication_timeout - we want to quit in response to such timeouts.
1360 : */
2987 andres 1361 GIC 5 : if (ClientAuthInProgress)
2987 andres 1362 UIC 0 : sig = SIGTERM;
2987 andres 1363 ECB :
3919 alvherre 1364 : #ifdef HAVE_SETSID
1365 : /* try to signal whole process group */
2987 andres 1366 CBC 5 : kill(-MyProcPid, sig);
3919 alvherre 1367 ECB : #endif
2987 andres 1368 GIC 5 : kill(MyProcPid, sig);
3919 alvherre 1369 CBC 5 : }
1370 :
3676 tgl 1371 ECB : /*
1372 : * LOCK_TIMEOUT handler: trigger a query-cancel interrupt.
1373 : */
1374 : static void
3676 tgl 1375 GIC 4 : LockTimeoutHandler(void)
1376 : {
1377 : #ifdef HAVE_SETSID
1378 : /* try to signal whole process group */
1379 4 : kill(-MyProcPid, SIGINT);
3676 tgl 1380 ECB : #endif
3676 tgl 1381 GIC 4 : kill(MyProcPid, SIGINT);
1382 4 : }
1383 :
1384 : static void
2580 rhaas 1385 LBC 0 : IdleInTransactionSessionTimeoutHandler(void)
2580 rhaas 1386 ECB : {
2580 rhaas 1387 UIC 0 : IdleInTransactionSessionTimeoutPending = true;
2580 rhaas 1388 LBC 0 : InterruptPending = true;
2580 rhaas 1389 UIC 0 : SetLatch(MyLatch);
1390 0 : }
3919 alvherre 1391 ECB :
1392 : static void
823 tgl 1393 UIC 0 : IdleSessionTimeoutHandler(void)
823 tgl 1394 ECB : {
823 tgl 1395 LBC 0 : IdleSessionTimeoutPending = true;
1396 0 : InterruptPending = true;
1397 0 : SetLatch(MyLatch);
823 tgl 1398 UIC 0 : }
823 tgl 1399 ECB :
368 andres 1400 : static void
368 andres 1401 GIC 15 : IdleStatsUpdateTimeoutHandler(void)
1402 : {
1403 15 : IdleStatsUpdateTimeoutPending = true;
1404 15 : InterruptPending = true;
1405 15 : SetLatch(MyLatch);
1406 15 : }
1407 :
1408 : static void
736 tmunro 1409 UIC 0 : ClientCheckTimeoutHandler(void)
1410 : {
1411 0 : CheckClientConnectionPending = true;
1412 0 : InterruptPending = true;
1413 0 : SetLatch(MyLatch);
736 tmunro 1414 LBC 0 : }
1415 :
1416 : /*
6494 tgl 1417 ECB : * Returns true if at least one role is defined in this database cluster.
1418 : */
1419 : static bool
6494 tgl 1420 GIC 314 : ThereIsAtLeastOneRole(void)
1421 : {
1422 : Relation pg_authid_rel;
1490 andres 1423 ECB : TableScanDesc scan;
7883 peter_e 1424 : bool result;
1425 :
1539 andres 1426 GIC 314 : pg_authid_rel = table_open(AuthIdRelationId, AccessShareLock);
1427 :
1490 1428 314 : scan = table_beginscan_catalog(pg_authid_rel, 0, NULL);
7629 tgl 1429 314 : result = (heap_getnext(scan, ForwardScanDirection) != NULL);
1430 :
1490 andres 1431 CBC 314 : table_endscan(scan);
1539 andres 1432 GIC 314 : table_close(pg_authid_rel, AccessShareLock);
7883 peter_e 1433 ECB :
7883 peter_e 1434 GIC 314 : return result;
1435 : }
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