Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * pqcomm.c
4 : * Communication functions between the Frontend and the Backend
5 : *
6 : * These routines handle the low-level details of communication between
7 : * frontend and backend. They just shove data across the communication
8 : * channel, and are ignorant of the semantics of the data.
9 : *
10 : * To emit an outgoing message, use the routines in pqformat.c to construct
11 : * the message in a buffer and then emit it in one call to pq_putmessage.
12 : * There are no functions to send raw bytes or partial messages; this
13 : * ensures that the channel will not be clogged by an incomplete message if
14 : * execution is aborted by ereport(ERROR) partway through the message.
15 : *
16 : * At one time, libpq was shared between frontend and backend, but now
17 : * the backend's "backend/libpq" is quite separate from "interfaces/libpq".
18 : * All that remains is similarities of names to trap the unwary...
19 : *
20 : * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
21 : * Portions Copyright (c) 1994, Regents of the University of California
22 : *
23 : * src/backend/libpq/pqcomm.c
24 : *
25 : *-------------------------------------------------------------------------
26 : */
27 :
28 : /*------------------------
29 : * INTERFACE ROUTINES
30 : *
31 : * setup/teardown:
32 : * ListenServerPort - Open postmaster's server port
33 : * AcceptConnection - Accept new connection with client
34 : * TouchSocketFiles - Protect socket files against /tmp cleaners
35 : * pq_init - initialize libpq at backend startup
36 : * socket_comm_reset - reset libpq during error recovery
37 : * socket_close - shutdown libpq at backend exit
38 : *
39 : * low-level I/O:
40 : * pq_getbytes - get a known number of bytes from connection
41 : * pq_getmessage - get a message with length word from connection
42 : * pq_getbyte - get next byte from connection
43 : * pq_peekbyte - peek at next byte from connection
44 : * pq_flush - flush pending output
45 : * pq_flush_if_writable - flush pending output if writable without blocking
46 : * pq_getbyte_if_available - get a byte if available without blocking
47 : *
48 : * message-level I/O
49 : * pq_putmessage - send a normal message (suppressed in COPY OUT mode)
50 : * pq_putmessage_noblock - buffer a normal message (suppressed in COPY OUT)
51 : *
52 : *------------------------
53 : */
54 : #include "postgres.h"
55 :
56 : #ifdef HAVE_POLL_H
57 : #include <poll.h>
58 : #endif
59 : #include <signal.h>
60 : #include <fcntl.h>
61 : #include <grp.h>
62 : #include <unistd.h>
63 : #include <sys/file.h>
64 : #include <sys/socket.h>
65 : #include <sys/stat.h>
66 : #include <sys/time.h>
67 : #include <netdb.h>
68 : #include <netinet/in.h>
69 : #include <netinet/tcp.h>
70 : #include <utime.h>
71 : #ifdef WIN32
72 : #include <mstcpip.h>
73 : #endif
74 :
75 : #include "common/ip.h"
76 : #include "libpq/libpq.h"
77 : #include "miscadmin.h"
78 : #include "port/pg_bswap.h"
79 : #include "storage/ipc.h"
80 : #include "utils/guc_hooks.h"
81 : #include "utils/memutils.h"
82 :
83 : /*
84 : * Cope with the various platform-specific ways to spell TCP keepalive socket
85 : * options. This doesn't cover Windows, which as usual does its own thing.
86 : */
87 : #if defined(TCP_KEEPIDLE)
88 : /* TCP_KEEPIDLE is the name of this option on Linux and *BSD */
89 : #define PG_TCP_KEEPALIVE_IDLE TCP_KEEPIDLE
90 : #define PG_TCP_KEEPALIVE_IDLE_STR "TCP_KEEPIDLE"
91 : #elif defined(TCP_KEEPALIVE_THRESHOLD)
92 : /* TCP_KEEPALIVE_THRESHOLD is the name of this option on Solaris >= 11 */
93 : #define PG_TCP_KEEPALIVE_IDLE TCP_KEEPALIVE_THRESHOLD
94 : #define PG_TCP_KEEPALIVE_IDLE_STR "TCP_KEEPALIVE_THRESHOLD"
95 : #elif defined(TCP_KEEPALIVE) && defined(__darwin__)
96 : /* TCP_KEEPALIVE is the name of this option on macOS */
97 : /* Caution: Solaris has this symbol but it means something different */
98 : #define PG_TCP_KEEPALIVE_IDLE TCP_KEEPALIVE
99 : #define PG_TCP_KEEPALIVE_IDLE_STR "TCP_KEEPALIVE"
100 : #endif
101 :
102 : /*
103 : * Configuration options
104 : */
105 : int Unix_socket_permissions;
106 : char *Unix_socket_group;
107 :
108 : /* Where the Unix socket files are (list of palloc'd strings) */
109 : static List *sock_paths = NIL;
110 :
111 : /*
112 : * Buffers for low-level I/O.
113 : *
114 : * The receive buffer is fixed size. Send buffer is usually 8k, but can be
115 : * enlarged by pq_putmessage_noblock() if the message doesn't fit otherwise.
116 : */
117 :
118 : #define PQ_SEND_BUFFER_SIZE 8192
119 : #define PQ_RECV_BUFFER_SIZE 8192
120 :
121 : static char *PqSendBuffer;
122 : static int PqSendBufferSize; /* Size send buffer */
123 : static size_t PqSendPointer; /* Next index to store a byte in PqSendBuffer */
124 : static size_t PqSendStart; /* Next index to send a byte in PqSendBuffer */
125 :
126 : static char PqRecvBuffer[PQ_RECV_BUFFER_SIZE];
127 : static int PqRecvPointer; /* Next index to read a byte from PqRecvBuffer */
128 : static int PqRecvLength; /* End of data available in PqRecvBuffer */
129 :
130 : /*
131 : * Message status
132 : */
133 : static bool PqCommBusy; /* busy sending data to the client */
134 : static bool PqCommReadingMsg; /* in the middle of reading a message */
135 :
136 :
137 : /* Internal functions */
138 : static void socket_comm_reset(void);
139 : static void socket_close(int code, Datum arg);
140 : static void socket_set_nonblocking(bool nonblocking);
141 : static int socket_flush(void);
142 : static int socket_flush_if_writable(void);
143 : static bool socket_is_send_pending(void);
144 : static int socket_putmessage(char msgtype, const char *s, size_t len);
145 : static void socket_putmessage_noblock(char msgtype, const char *s, size_t len);
146 : static inline int internal_putbytes(const char *s, size_t len);
147 : static inline int internal_flush(void);
148 : static pg_noinline int internal_flush_buffer(const char *buf, size_t *start,
149 : size_t *end);
150 :
151 : static int Lock_AF_UNIX(const char *unixSocketDir, const char *unixSocketPath);
152 : static int Setup_AF_UNIX(const char *sock_path);
153 :
154 : static const PQcommMethods PqCommSocketMethods = {
155 : .comm_reset = socket_comm_reset,
156 : .flush = socket_flush,
157 : .flush_if_writable = socket_flush_if_writable,
158 : .is_send_pending = socket_is_send_pending,
159 : .putmessage = socket_putmessage,
160 : .putmessage_noblock = socket_putmessage_noblock
161 : };
162 :
163 : const PQcommMethods *PqCommMethods = &PqCommSocketMethods;
164 :
165 : WaitEventSet *FeBeWaitSet;
166 :
167 :
168 : /* --------------------------------
169 : * pq_init - initialize libpq at backend startup
170 : * --------------------------------
171 : */
172 : Port *
173 21024 : pq_init(ClientSocket *client_sock)
174 : {
175 : Port *port;
176 : int socket_pos PG_USED_FOR_ASSERTS_ONLY;
177 : int latch_pos PG_USED_FOR_ASSERTS_ONLY;
178 :
179 : /* allocate the Port struct and copy the ClientSocket contents to it */
180 21024 : port = palloc0(sizeof(Port));
181 21024 : port->sock = client_sock->sock;
182 21024 : memcpy(&port->raddr.addr, &client_sock->raddr.addr, client_sock->raddr.salen);
183 21024 : port->raddr.salen = client_sock->raddr.salen;
184 :
185 : /* fill in the server (local) address */
186 21024 : port->laddr.salen = sizeof(port->laddr.addr);
187 21024 : if (getsockname(port->sock,
188 21024 : (struct sockaddr *) &port->laddr.addr,
189 : &port->laddr.salen) < 0)
190 : {
191 0 : ereport(FATAL,
192 : (errmsg("%s() failed: %m", "getsockname")));
193 : }
194 :
195 : /* select NODELAY and KEEPALIVE options if it's a TCP connection */
196 21024 : if (port->laddr.addr.ss_family != AF_UNIX)
197 : {
198 : int on;
199 : #ifdef WIN32
200 : int oldopt;
201 : int optlen;
202 : int newopt;
203 : #endif
204 :
205 : #ifdef TCP_NODELAY
206 516 : on = 1;
207 516 : if (setsockopt(port->sock, IPPROTO_TCP, TCP_NODELAY,
208 : (char *) &on, sizeof(on)) < 0)
209 : {
210 0 : ereport(FATAL,
211 : (errmsg("%s(%s) failed: %m", "setsockopt", "TCP_NODELAY")));
212 : }
213 : #endif
214 516 : on = 1;
215 516 : if (setsockopt(port->sock, SOL_SOCKET, SO_KEEPALIVE,
216 : (char *) &on, sizeof(on)) < 0)
217 : {
218 0 : ereport(FATAL,
219 : (errmsg("%s(%s) failed: %m", "setsockopt", "SO_KEEPALIVE")));
220 : }
221 :
222 : #ifdef WIN32
223 :
224 : /*
225 : * This is a Win32 socket optimization. The OS send buffer should be
226 : * large enough to send the whole Postgres send buffer in one go, or
227 : * performance suffers. The Postgres send buffer can be enlarged if a
228 : * very large message needs to be sent, but we won't attempt to
229 : * enlarge the OS buffer if that happens, so somewhat arbitrarily
230 : * ensure that the OS buffer is at least PQ_SEND_BUFFER_SIZE * 4.
231 : * (That's 32kB with the current default).
232 : *
233 : * The default OS buffer size used to be 8kB in earlier Windows
234 : * versions, but was raised to 64kB in Windows 2012. So it shouldn't
235 : * be necessary to change it in later versions anymore. Changing it
236 : * unnecessarily can even reduce performance, because setting
237 : * SO_SNDBUF in the application disables the "dynamic send buffering"
238 : * feature that was introduced in Windows 7. So before fiddling with
239 : * SO_SNDBUF, check if the current buffer size is already large enough
240 : * and only increase it if necessary.
241 : *
242 : * See https://support.microsoft.com/kb/823764/EN-US/ and
243 : * https://msdn.microsoft.com/en-us/library/bb736549%28v=vs.85%29.aspx
244 : */
245 : optlen = sizeof(oldopt);
246 : if (getsockopt(port->sock, SOL_SOCKET, SO_SNDBUF, (char *) &oldopt,
247 : &optlen) < 0)
248 : {
249 : ereport(FATAL,
250 : (errmsg("%s(%s) failed: %m", "getsockopt", "SO_SNDBUF")));
251 : }
252 : newopt = PQ_SEND_BUFFER_SIZE * 4;
253 : if (oldopt < newopt)
254 : {
255 : if (setsockopt(port->sock, SOL_SOCKET, SO_SNDBUF, (char *) &newopt,
256 : sizeof(newopt)) < 0)
257 : {
258 : ereport(FATAL,
259 : (errmsg("%s(%s) failed: %m", "setsockopt", "SO_SNDBUF")));
260 : }
261 : }
262 : #endif
263 :
264 : /*
265 : * Also apply the current keepalive parameters. If we fail to set a
266 : * parameter, don't error out, because these aren't universally
267 : * supported. (Note: you might think we need to reset the GUC
268 : * variables to 0 in such a case, but it's not necessary because the
269 : * show hooks for these variables report the truth anyway.)
270 : */
271 516 : (void) pq_setkeepalivesidle(tcp_keepalives_idle, port);
272 516 : (void) pq_setkeepalivesinterval(tcp_keepalives_interval, port);
273 516 : (void) pq_setkeepalivescount(tcp_keepalives_count, port);
274 516 : (void) pq_settcpusertimeout(tcp_user_timeout, port);
275 : }
276 :
277 : /* initialize state variables */
278 21024 : PqSendBufferSize = PQ_SEND_BUFFER_SIZE;
279 21024 : PqSendBuffer = MemoryContextAlloc(TopMemoryContext, PqSendBufferSize);
280 21024 : PqSendPointer = PqSendStart = PqRecvPointer = PqRecvLength = 0;
281 21024 : PqCommBusy = false;
282 21024 : PqCommReadingMsg = false;
283 :
284 : /* set up process-exit hook to close the socket */
285 21024 : on_proc_exit(socket_close, 0);
286 :
287 : /*
288 : * In backends (as soon as forked) we operate the underlying socket in
289 : * nonblocking mode and use latches to implement blocking semantics if
290 : * needed. That allows us to provide safely interruptible reads and
291 : * writes.
292 : */
293 : #ifndef WIN32
294 21024 : if (!pg_set_noblock(port->sock))
295 0 : ereport(FATAL,
296 : (errmsg("could not set socket to nonblocking mode: %m")));
297 : #endif
298 :
299 : #ifndef WIN32
300 :
301 : /* Don't give the socket to any subprograms we execute. */
302 21024 : if (fcntl(port->sock, F_SETFD, FD_CLOEXEC) < 0)
303 0 : elog(FATAL, "fcntl(F_SETFD) failed on socket: %m");
304 : #endif
305 :
306 21024 : FeBeWaitSet = CreateWaitEventSet(NULL, FeBeWaitSetNEvents);
307 21024 : socket_pos = AddWaitEventToSet(FeBeWaitSet, WL_SOCKET_WRITEABLE,
308 : port->sock, NULL, NULL);
309 21024 : latch_pos = AddWaitEventToSet(FeBeWaitSet, WL_LATCH_SET, PGINVALID_SOCKET,
310 : MyLatch, NULL);
311 21024 : AddWaitEventToSet(FeBeWaitSet, WL_POSTMASTER_DEATH, PGINVALID_SOCKET,
312 : NULL, NULL);
313 :
314 : /*
315 : * The event positions match the order we added them, but let's sanity
316 : * check them to be sure.
317 : */
318 : Assert(socket_pos == FeBeWaitSetSocketPos);
319 : Assert(latch_pos == FeBeWaitSetLatchPos);
320 :
321 21024 : return port;
322 : }
323 :
324 : /* --------------------------------
325 : * socket_comm_reset - reset libpq during error recovery
326 : *
327 : * This is called from error recovery at the outer idle loop. It's
328 : * just to get us out of trouble if we somehow manage to elog() from
329 : * inside a pqcomm.c routine (which ideally will never happen, but...)
330 : * --------------------------------
331 : */
332 : static void
333 39946 : socket_comm_reset(void)
334 : {
335 : /* Do not throw away pending data, but do reset the busy flag */
336 39946 : PqCommBusy = false;
337 39946 : }
338 :
339 : /* --------------------------------
340 : * socket_close - shutdown libpq at backend exit
341 : *
342 : * This is the one pg_on_exit_callback in place during BackendInitialize().
343 : * That function's unusual signal handling constrains that this callback be
344 : * safe to run at any instant.
345 : * --------------------------------
346 : */
347 : static void
348 21024 : socket_close(int code, Datum arg)
349 : {
350 : /* Nothing to do in a standalone backend, where MyProcPort is NULL. */
351 21024 : if (MyProcPort != NULL)
352 : {
353 : #ifdef ENABLE_GSS
354 : /*
355 : * Shutdown GSSAPI layer. This section does nothing when interrupting
356 : * BackendInitialize(), because pg_GSS_recvauth() makes first use of
357 : * "ctx" and "cred".
358 : *
359 : * Note that we don't bother to free MyProcPort->gss, since we're
360 : * about to exit anyway.
361 : */
362 : if (MyProcPort->gss)
363 : {
364 : OM_uint32 min_s;
365 :
366 : if (MyProcPort->gss->ctx != GSS_C_NO_CONTEXT)
367 : gss_delete_sec_context(&min_s, &MyProcPort->gss->ctx, NULL);
368 :
369 : if (MyProcPort->gss->cred != GSS_C_NO_CREDENTIAL)
370 : gss_release_cred(&min_s, &MyProcPort->gss->cred);
371 : }
372 : #endif /* ENABLE_GSS */
373 :
374 : /*
375 : * Cleanly shut down SSL layer. Nowhere else does a postmaster child
376 : * call this, so this is safe when interrupting BackendInitialize().
377 : */
378 21024 : secure_close(MyProcPort);
379 :
380 : /*
381 : * Formerly we did an explicit close() here, but it seems better to
382 : * leave the socket open until the process dies. This allows clients
383 : * to perform a "synchronous close" if they care --- wait till the
384 : * transport layer reports connection closure, and you can be sure the
385 : * backend has exited.
386 : *
387 : * We do set sock to PGINVALID_SOCKET to prevent any further I/O,
388 : * though.
389 : */
390 21024 : MyProcPort->sock = PGINVALID_SOCKET;
391 : }
392 21024 : }
393 :
394 :
395 :
396 : /* --------------------------------
397 : * Postmaster functions to handle sockets.
398 : * --------------------------------
399 : */
400 :
401 : /*
402 : * ListenServerPort -- open a "listening" port to accept connections.
403 : *
404 : * family should be AF_UNIX or AF_UNSPEC; portNumber is the port number.
405 : * For AF_UNIX ports, hostName should be NULL and unixSocketDir must be
406 : * specified. For TCP ports, hostName is either NULL for all interfaces or
407 : * the interface to listen on, and unixSocketDir is ignored (can be NULL).
408 : *
409 : * Successfully opened sockets are appended to the ListenSockets[] array. On
410 : * entry, *NumListenSockets holds the number of elements currently in the
411 : * array, and it is updated to reflect the opened sockets. MaxListen is the
412 : * allocated size of the array.
413 : *
414 : * RETURNS: STATUS_OK or STATUS_ERROR
415 : */
416 : int
417 1470 : ListenServerPort(int family, const char *hostName, unsigned short portNumber,
418 : const char *unixSocketDir,
419 : pgsocket ListenSockets[], int *NumListenSockets, int MaxListen)
420 : {
421 : pgsocket fd;
422 : int err;
423 : int maxconn;
424 : int ret;
425 : char portNumberStr[32];
426 : const char *familyDesc;
427 : char familyDescBuf[64];
428 : const char *addrDesc;
429 : char addrBuf[NI_MAXHOST];
430 : char *service;
431 1470 : struct addrinfo *addrs = NULL,
432 : *addr;
433 : struct addrinfo hint;
434 1470 : int added = 0;
435 : char unixSocketPath[MAXPGPATH];
436 : #if !defined(WIN32) || defined(IPV6_V6ONLY)
437 1470 : int one = 1;
438 : #endif
439 :
440 : /* Initialize hint structure */
441 10290 : MemSet(&hint, 0, sizeof(hint));
442 1470 : hint.ai_family = family;
443 1470 : hint.ai_flags = AI_PASSIVE;
444 1470 : hint.ai_socktype = SOCK_STREAM;
445 :
446 1470 : if (family == AF_UNIX)
447 : {
448 : /*
449 : * Create unixSocketPath from portNumber and unixSocketDir and lock
450 : * that file path
451 : */
452 1420 : UNIXSOCK_PATH(unixSocketPath, portNumber, unixSocketDir);
453 1420 : if (strlen(unixSocketPath) >= UNIXSOCK_PATH_BUFLEN)
454 : {
455 0 : ereport(LOG,
456 : (errmsg("Unix-domain socket path \"%s\" is too long (maximum %d bytes)",
457 : unixSocketPath,
458 : (int) (UNIXSOCK_PATH_BUFLEN - 1))));
459 0 : return STATUS_ERROR;
460 : }
461 1420 : if (Lock_AF_UNIX(unixSocketDir, unixSocketPath) != STATUS_OK)
462 0 : return STATUS_ERROR;
463 1420 : service = unixSocketPath;
464 : }
465 : else
466 : {
467 50 : snprintf(portNumberStr, sizeof(portNumberStr), "%d", portNumber);
468 50 : service = portNumberStr;
469 : }
470 :
471 1470 : ret = pg_getaddrinfo_all(hostName, service, &hint, &addrs);
472 1470 : if (ret || !addrs)
473 : {
474 0 : if (hostName)
475 0 : ereport(LOG,
476 : (errmsg("could not translate host name \"%s\", service \"%s\" to address: %s",
477 : hostName, service, gai_strerror(ret))));
478 : else
479 0 : ereport(LOG,
480 : (errmsg("could not translate service \"%s\" to address: %s",
481 : service, gai_strerror(ret))));
482 0 : if (addrs)
483 0 : pg_freeaddrinfo_all(hint.ai_family, addrs);
484 0 : return STATUS_ERROR;
485 : }
486 :
487 2942 : for (addr = addrs; addr; addr = addr->ai_next)
488 : {
489 1472 : if (family != AF_UNIX && addr->ai_family == AF_UNIX)
490 : {
491 : /*
492 : * Only set up a unix domain socket when they really asked for it.
493 : * The service/port is different in that case.
494 : */
495 0 : continue;
496 : }
497 :
498 : /* See if there is still room to add 1 more socket. */
499 1472 : if (*NumListenSockets == MaxListen)
500 : {
501 0 : ereport(LOG,
502 : (errmsg("could not bind to all requested addresses: MAXLISTEN (%d) exceeded",
503 : MaxListen)));
504 0 : break;
505 : }
506 :
507 : /* set up address family name for log messages */
508 1472 : switch (addr->ai_family)
509 : {
510 50 : case AF_INET:
511 50 : familyDesc = _("IPv4");
512 50 : break;
513 2 : case AF_INET6:
514 2 : familyDesc = _("IPv6");
515 2 : break;
516 1420 : case AF_UNIX:
517 1420 : familyDesc = _("Unix");
518 1420 : break;
519 0 : default:
520 0 : snprintf(familyDescBuf, sizeof(familyDescBuf),
521 0 : _("unrecognized address family %d"),
522 : addr->ai_family);
523 0 : familyDesc = familyDescBuf;
524 0 : break;
525 : }
526 :
527 : /* set up text form of address for log messages */
528 1472 : if (addr->ai_family == AF_UNIX)
529 1420 : addrDesc = unixSocketPath;
530 : else
531 : {
532 52 : pg_getnameinfo_all((const struct sockaddr_storage *) addr->ai_addr,
533 52 : addr->ai_addrlen,
534 : addrBuf, sizeof(addrBuf),
535 : NULL, 0,
536 : NI_NUMERICHOST);
537 52 : addrDesc = addrBuf;
538 : }
539 :
540 1472 : if ((fd = socket(addr->ai_family, SOCK_STREAM, 0)) == PGINVALID_SOCKET)
541 : {
542 0 : ereport(LOG,
543 : (errcode_for_socket_access(),
544 : /* translator: first %s is IPv4, IPv6, or Unix */
545 : errmsg("could not create %s socket for address \"%s\": %m",
546 : familyDesc, addrDesc)));
547 0 : continue;
548 : }
549 :
550 : #ifndef WIN32
551 : /* Don't give the listen socket to any subprograms we execute. */
552 1472 : if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
553 0 : elog(FATAL, "fcntl(F_SETFD) failed on socket: %m");
554 :
555 : /*
556 : * Without the SO_REUSEADDR flag, a new postmaster can't be started
557 : * right away after a stop or crash, giving "address already in use"
558 : * error on TCP ports.
559 : *
560 : * On win32, however, this behavior only happens if the
561 : * SO_EXCLUSIVEADDRUSE is set. With SO_REUSEADDR, win32 allows
562 : * multiple servers to listen on the same address, resulting in
563 : * unpredictable behavior. With no flags at all, win32 behaves as Unix
564 : * with SO_REUSEADDR.
565 : */
566 1472 : if (addr->ai_family != AF_UNIX)
567 : {
568 52 : if ((setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
569 : (char *) &one, sizeof(one))) == -1)
570 : {
571 0 : ereport(LOG,
572 : (errcode_for_socket_access(),
573 : /* translator: third %s is IPv4, IPv6, or Unix */
574 : errmsg("%s(%s) failed for %s address \"%s\": %m",
575 : "setsockopt", "SO_REUSEADDR",
576 : familyDesc, addrDesc)));
577 0 : closesocket(fd);
578 0 : continue;
579 : }
580 : }
581 : #endif
582 :
583 : #ifdef IPV6_V6ONLY
584 1472 : if (addr->ai_family == AF_INET6)
585 : {
586 2 : if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY,
587 : (char *) &one, sizeof(one)) == -1)
588 : {
589 0 : ereport(LOG,
590 : (errcode_for_socket_access(),
591 : /* translator: third %s is IPv4, IPv6, or Unix */
592 : errmsg("%s(%s) failed for %s address \"%s\": %m",
593 : "setsockopt", "IPV6_V6ONLY",
594 : familyDesc, addrDesc)));
595 0 : closesocket(fd);
596 0 : continue;
597 : }
598 : }
599 : #endif
600 :
601 : /*
602 : * Note: This might fail on some OS's, like Linux older than
603 : * 2.4.21-pre3, that don't have the IPV6_V6ONLY socket option, and map
604 : * ipv4 addresses to ipv6. It will show ::ffff:ipv4 for all ipv4
605 : * connections.
606 : */
607 1472 : err = bind(fd, addr->ai_addr, addr->ai_addrlen);
608 1472 : if (err < 0)
609 : {
610 0 : int saved_errno = errno;
611 :
612 0 : ereport(LOG,
613 : (errcode_for_socket_access(),
614 : /* translator: first %s is IPv4, IPv6, or Unix */
615 : errmsg("could not bind %s address \"%s\": %m",
616 : familyDesc, addrDesc),
617 : saved_errno == EADDRINUSE ?
618 : (addr->ai_family == AF_UNIX ?
619 : errhint("Is another postmaster already running on port %d?",
620 : (int) portNumber) :
621 : errhint("Is another postmaster already running on port %d?"
622 : " If not, wait a few seconds and retry.",
623 : (int) portNumber)) : 0));
624 0 : closesocket(fd);
625 0 : continue;
626 : }
627 :
628 1472 : if (addr->ai_family == AF_UNIX)
629 : {
630 1420 : if (Setup_AF_UNIX(service) != STATUS_OK)
631 : {
632 0 : closesocket(fd);
633 0 : break;
634 : }
635 : }
636 :
637 : /*
638 : * Select appropriate accept-queue length limit. It seems reasonable
639 : * to use a value similar to the maximum number of child processes
640 : * that the postmaster will permit.
641 : */
642 1472 : maxconn = MaxConnections * 2;
643 :
644 1472 : err = listen(fd, maxconn);
645 1472 : if (err < 0)
646 : {
647 0 : ereport(LOG,
648 : (errcode_for_socket_access(),
649 : /* translator: first %s is IPv4, IPv6, or Unix */
650 : errmsg("could not listen on %s address \"%s\": %m",
651 : familyDesc, addrDesc)));
652 0 : closesocket(fd);
653 0 : continue;
654 : }
655 :
656 1472 : if (addr->ai_family == AF_UNIX)
657 1420 : ereport(LOG,
658 : (errmsg("listening on Unix socket \"%s\"",
659 : addrDesc)));
660 : else
661 52 : ereport(LOG,
662 : /* translator: first %s is IPv4 or IPv6 */
663 : (errmsg("listening on %s address \"%s\", port %d",
664 : familyDesc, addrDesc, (int) portNumber)));
665 :
666 1472 : ListenSockets[*NumListenSockets] = fd;
667 1472 : (*NumListenSockets)++;
668 1472 : added++;
669 : }
670 :
671 1470 : pg_freeaddrinfo_all(hint.ai_family, addrs);
672 :
673 1470 : if (!added)
674 0 : return STATUS_ERROR;
675 :
676 1470 : return STATUS_OK;
677 : }
678 :
679 :
680 : /*
681 : * Lock_AF_UNIX -- configure unix socket file path
682 : */
683 : static int
684 1420 : Lock_AF_UNIX(const char *unixSocketDir, const char *unixSocketPath)
685 : {
686 : /* no lock file for abstract sockets */
687 1420 : if (unixSocketPath[0] == '@')
688 0 : return STATUS_OK;
689 :
690 : /*
691 : * Grab an interlock file associated with the socket file.
692 : *
693 : * Note: there are two reasons for using a socket lock file, rather than
694 : * trying to interlock directly on the socket itself. First, it's a lot
695 : * more portable, and second, it lets us remove any pre-existing socket
696 : * file without race conditions.
697 : */
698 1420 : CreateSocketLockFile(unixSocketPath, true, unixSocketDir);
699 :
700 : /*
701 : * Once we have the interlock, we can safely delete any pre-existing
702 : * socket file to avoid failure at bind() time.
703 : */
704 1420 : (void) unlink(unixSocketPath);
705 :
706 : /*
707 : * Remember socket file pathnames for later maintenance.
708 : */
709 1420 : sock_paths = lappend(sock_paths, pstrdup(unixSocketPath));
710 :
711 1420 : return STATUS_OK;
712 : }
713 :
714 :
715 : /*
716 : * Setup_AF_UNIX -- configure unix socket permissions
717 : */
718 : static int
719 1420 : Setup_AF_UNIX(const char *sock_path)
720 : {
721 : /* no file system permissions for abstract sockets */
722 1420 : if (sock_path[0] == '@')
723 0 : return STATUS_OK;
724 :
725 : /*
726 : * Fix socket ownership/permission if requested. Note we must do this
727 : * before we listen() to avoid a window where unwanted connections could
728 : * get accepted.
729 : */
730 : Assert(Unix_socket_group);
731 1420 : if (Unix_socket_group[0] != '\0')
732 : {
733 : #ifdef WIN32
734 : elog(WARNING, "configuration item unix_socket_group is not supported on this platform");
735 : #else
736 : char *endptr;
737 : unsigned long val;
738 : gid_t gid;
739 :
740 0 : val = strtoul(Unix_socket_group, &endptr, 10);
741 0 : if (*endptr == '\0')
742 : { /* numeric group id */
743 0 : gid = val;
744 : }
745 : else
746 : { /* convert group name to id */
747 : struct group *gr;
748 :
749 0 : gr = getgrnam(Unix_socket_group);
750 0 : if (!gr)
751 : {
752 0 : ereport(LOG,
753 : (errmsg("group \"%s\" does not exist",
754 : Unix_socket_group)));
755 0 : return STATUS_ERROR;
756 : }
757 0 : gid = gr->gr_gid;
758 : }
759 0 : if (chown(sock_path, -1, gid) == -1)
760 : {
761 0 : ereport(LOG,
762 : (errcode_for_file_access(),
763 : errmsg("could not set group of file \"%s\": %m",
764 : sock_path)));
765 0 : return STATUS_ERROR;
766 : }
767 : #endif
768 : }
769 :
770 1420 : if (chmod(sock_path, Unix_socket_permissions) == -1)
771 : {
772 0 : ereport(LOG,
773 : (errcode_for_file_access(),
774 : errmsg("could not set permissions of file \"%s\": %m",
775 : sock_path)));
776 0 : return STATUS_ERROR;
777 : }
778 1420 : return STATUS_OK;
779 : }
780 :
781 :
782 : /*
783 : * AcceptConnection -- accept a new connection with client using
784 : * server port. Fills *client_sock with the FD and endpoint info
785 : * of the new connection.
786 : *
787 : * ASSUME: that this doesn't need to be non-blocking because
788 : * the Postmaster waits for the socket to be ready to accept().
789 : *
790 : * RETURNS: STATUS_OK or STATUS_ERROR
791 : */
792 : int
793 21392 : AcceptConnection(pgsocket server_fd, ClientSocket *client_sock)
794 : {
795 : /* accept connection and fill in the client (remote) address */
796 21392 : client_sock->raddr.salen = sizeof(client_sock->raddr.addr);
797 21392 : if ((client_sock->sock = accept(server_fd,
798 21392 : (struct sockaddr *) &client_sock->raddr.addr,
799 : &client_sock->raddr.salen)) == PGINVALID_SOCKET)
800 : {
801 0 : ereport(LOG,
802 : (errcode_for_socket_access(),
803 : errmsg("could not accept new connection: %m")));
804 :
805 : /*
806 : * If accept() fails then postmaster.c will still see the server
807 : * socket as read-ready, and will immediately try again. To avoid
808 : * uselessly sucking lots of CPU, delay a bit before trying again.
809 : * (The most likely reason for failure is being out of kernel file
810 : * table slots; we can do little except hope some will get freed up.)
811 : */
812 0 : pg_usleep(100000L); /* wait 0.1 sec */
813 0 : return STATUS_ERROR;
814 : }
815 :
816 21392 : return STATUS_OK;
817 : }
818 :
819 : /*
820 : * TouchSocketFiles -- mark socket files as recently accessed
821 : *
822 : * This routine should be called every so often to ensure that the socket
823 : * files have a recent mod date (ordinary operations on sockets usually won't
824 : * change the mod date). That saves them from being removed by
825 : * overenthusiastic /tmp-directory-cleaner daemons. (Another reason we should
826 : * never have put the socket file in /tmp...)
827 : */
828 : void
829 0 : TouchSocketFiles(void)
830 : {
831 : ListCell *l;
832 :
833 : /* Loop through all created sockets... */
834 0 : foreach(l, sock_paths)
835 : {
836 0 : char *sock_path = (char *) lfirst(l);
837 :
838 : /* Ignore errors; there's no point in complaining */
839 0 : (void) utime(sock_path, NULL);
840 : }
841 0 : }
842 :
843 : /*
844 : * RemoveSocketFiles -- unlink socket files at postmaster shutdown
845 : */
846 : void
847 1416 : RemoveSocketFiles(void)
848 : {
849 : ListCell *l;
850 :
851 : /* Loop through all created sockets... */
852 2830 : foreach(l, sock_paths)
853 : {
854 1414 : char *sock_path = (char *) lfirst(l);
855 :
856 : /* Ignore any error. */
857 1414 : (void) unlink(sock_path);
858 : }
859 : /* Since we're about to exit, no need to reclaim storage */
860 1416 : sock_paths = NIL;
861 1416 : }
862 :
863 :
864 : /* --------------------------------
865 : * Low-level I/O routines begin here.
866 : *
867 : * These routines communicate with a frontend client across a connection
868 : * already established by the preceding routines.
869 : * --------------------------------
870 : */
871 :
872 : /* --------------------------------
873 : * socket_set_nonblocking - set socket blocking/non-blocking
874 : *
875 : * Sets the socket non-blocking if nonblocking is true, or sets it
876 : * blocking otherwise.
877 : * --------------------------------
878 : */
879 : static void
880 4288164 : socket_set_nonblocking(bool nonblocking)
881 : {
882 4288164 : if (MyProcPort == NULL)
883 0 : ereport(ERROR,
884 : (errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST),
885 : errmsg("there is no client connection")));
886 :
887 4288164 : MyProcPort->noblock = nonblocking;
888 4288164 : }
889 :
890 : /* --------------------------------
891 : * pq_recvbuf - load some bytes into the input buffer
892 : *
893 : * returns 0 if OK, EOF if trouble
894 : * --------------------------------
895 : */
896 : static int
897 696252 : pq_recvbuf(void)
898 : {
899 696252 : if (PqRecvPointer > 0)
900 : {
901 675228 : if (PqRecvLength > PqRecvPointer)
902 : {
903 : /* still some unread data, left-justify it in the buffer */
904 0 : memmove(PqRecvBuffer, PqRecvBuffer + PqRecvPointer,
905 0 : PqRecvLength - PqRecvPointer);
906 0 : PqRecvLength -= PqRecvPointer;
907 0 : PqRecvPointer = 0;
908 : }
909 : else
910 675228 : PqRecvLength = PqRecvPointer = 0;
911 : }
912 :
913 : /* Ensure that we're in blocking mode */
914 696252 : socket_set_nonblocking(false);
915 :
916 : /* Can fill buffer from PqRecvLength and upwards */
917 : for (;;)
918 0 : {
919 : int r;
920 :
921 696252 : errno = 0;
922 :
923 1392432 : r = secure_read(MyProcPort, PqRecvBuffer + PqRecvLength,
924 696252 : PQ_RECV_BUFFER_SIZE - PqRecvLength);
925 :
926 696180 : if (r < 0)
927 : {
928 4 : if (errno == EINTR)
929 0 : continue; /* Ok if interrupted */
930 :
931 : /*
932 : * Careful: an ereport() that tries to write to the client would
933 : * cause recursion to here, leading to stack overflow and core
934 : * dump! This message must go *only* to the postmaster log.
935 : *
936 : * If errno is zero, assume it's EOF and let the caller complain.
937 : */
938 4 : if (errno != 0)
939 4 : ereport(COMMERROR,
940 : (errcode_for_socket_access(),
941 : errmsg("could not receive data from client: %m")));
942 4 : return EOF;
943 : }
944 696176 : if (r == 0)
945 : {
946 : /*
947 : * EOF detected. We used to write a log message here, but it's
948 : * better to expect the ultimate caller to do that.
949 : */
950 134 : return EOF;
951 : }
952 : /* r contains number of bytes read, so just incr length */
953 696042 : PqRecvLength += r;
954 696042 : return 0;
955 : }
956 : }
957 :
958 : /* --------------------------------
959 : * pq_getbyte - get a single byte from connection, or return EOF
960 : * --------------------------------
961 : */
962 : int
963 1045958 : pq_getbyte(void)
964 : {
965 : Assert(PqCommReadingMsg);
966 :
967 1620504 : while (PqRecvPointer >= PqRecvLength)
968 : {
969 574730 : if (pq_recvbuf()) /* If nothing in buffer, then recv some */
970 112 : return EOF; /* Failed to recv data */
971 : }
972 1045774 : return (unsigned char) PqRecvBuffer[PqRecvPointer++];
973 : }
974 :
975 : /* --------------------------------
976 : * pq_peekbyte - peek at next byte from connection
977 : *
978 : * Same as pq_getbyte() except we don't advance the pointer.
979 : * --------------------------------
980 : */
981 : int
982 21024 : pq_peekbyte(void)
983 : {
984 : Assert(PqCommReadingMsg);
985 :
986 42048 : while (PqRecvPointer >= PqRecvLength)
987 : {
988 21024 : if (pq_recvbuf()) /* If nothing in buffer, then recv some */
989 0 : return EOF; /* Failed to recv data */
990 : }
991 21024 : return (unsigned char) PqRecvBuffer[PqRecvPointer];
992 : }
993 :
994 : /* --------------------------------
995 : * pq_getbyte_if_available - get a single byte from connection,
996 : * if available
997 : *
998 : * The received byte is stored in *c. Returns 1 if a byte was read,
999 : * 0 if no data was available, or EOF if trouble.
1000 : * --------------------------------
1001 : */
1002 : int
1003 2051644 : pq_getbyte_if_available(unsigned char *c)
1004 : {
1005 : int r;
1006 :
1007 : Assert(PqCommReadingMsg);
1008 :
1009 2051644 : if (PqRecvPointer < PqRecvLength)
1010 : {
1011 67182 : *c = PqRecvBuffer[PqRecvPointer++];
1012 67182 : return 1;
1013 : }
1014 :
1015 : /* Put the socket into non-blocking mode */
1016 1984462 : socket_set_nonblocking(true);
1017 :
1018 1984462 : errno = 0;
1019 :
1020 1984462 : r = secure_read(MyProcPort, c, 1);
1021 1984462 : if (r < 0)
1022 : {
1023 : /*
1024 : * Ok if no data available without blocking or interrupted (though
1025 : * EINTR really shouldn't happen with a non-blocking socket). Report
1026 : * other errors.
1027 : */
1028 1886644 : if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
1029 1886638 : r = 0;
1030 : else
1031 : {
1032 : /*
1033 : * Careful: an ereport() that tries to write to the client would
1034 : * cause recursion to here, leading to stack overflow and core
1035 : * dump! This message must go *only* to the postmaster log.
1036 : *
1037 : * If errno is zero, assume it's EOF and let the caller complain.
1038 : */
1039 6 : if (errno != 0)
1040 6 : ereport(COMMERROR,
1041 : (errcode_for_socket_access(),
1042 : errmsg("could not receive data from client: %m")));
1043 6 : r = EOF;
1044 : }
1045 : }
1046 97818 : else if (r == 0)
1047 : {
1048 : /* EOF detected */
1049 28 : r = EOF;
1050 : }
1051 :
1052 1984462 : return r;
1053 : }
1054 :
1055 : /* --------------------------------
1056 : * pq_getbytes - get a known number of bytes from connection
1057 : *
1058 : * returns 0 if OK, EOF if trouble
1059 : * --------------------------------
1060 : */
1061 : int
1062 2443254 : pq_getbytes(char *s, size_t len)
1063 : {
1064 : size_t amount;
1065 :
1066 : Assert(PqCommReadingMsg);
1067 :
1068 4888698 : while (len > 0)
1069 : {
1070 2545942 : while (PqRecvPointer >= PqRecvLength)
1071 : {
1072 100498 : if (pq_recvbuf()) /* If nothing in buffer, then recv some */
1073 26 : return EOF; /* Failed to recv data */
1074 : }
1075 2445444 : amount = PqRecvLength - PqRecvPointer;
1076 2445444 : if (amount > len)
1077 1749466 : amount = len;
1078 2445444 : memcpy(s, PqRecvBuffer + PqRecvPointer, amount);
1079 2445444 : PqRecvPointer += amount;
1080 2445444 : s += amount;
1081 2445444 : len -= amount;
1082 : }
1083 2443228 : return 0;
1084 : }
1085 :
1086 : /* --------------------------------
1087 : * pq_discardbytes - throw away a known number of bytes
1088 : *
1089 : * same as pq_getbytes except we do not copy the data to anyplace.
1090 : * this is used for resynchronizing after read errors.
1091 : *
1092 : * returns 0 if OK, EOF if trouble
1093 : * --------------------------------
1094 : */
1095 : static int
1096 0 : pq_discardbytes(size_t len)
1097 : {
1098 : size_t amount;
1099 :
1100 : Assert(PqCommReadingMsg);
1101 :
1102 0 : while (len > 0)
1103 : {
1104 0 : while (PqRecvPointer >= PqRecvLength)
1105 : {
1106 0 : if (pq_recvbuf()) /* If nothing in buffer, then recv some */
1107 0 : return EOF; /* Failed to recv data */
1108 : }
1109 0 : amount = PqRecvLength - PqRecvPointer;
1110 0 : if (amount > len)
1111 0 : amount = len;
1112 0 : PqRecvPointer += amount;
1113 0 : len -= amount;
1114 : }
1115 0 : return 0;
1116 : }
1117 :
1118 : /* --------------------------------
1119 : * pq_buffer_remaining_data - return number of bytes in receive buffer
1120 : *
1121 : * This will *not* attempt to read more data. And reading up to that number of
1122 : * bytes should not cause reading any more data either.
1123 : * --------------------------------
1124 : */
1125 : ssize_t
1126 704 : pq_buffer_remaining_data(void)
1127 : {
1128 : Assert(PqRecvLength >= PqRecvPointer);
1129 704 : return (PqRecvLength - PqRecvPointer);
1130 : }
1131 :
1132 :
1133 : /* --------------------------------
1134 : * pq_startmsgread - begin reading a message from the client.
1135 : *
1136 : * This must be called before any of the pq_get* functions.
1137 : * --------------------------------
1138 : */
1139 : void
1140 3140128 : pq_startmsgread(void)
1141 : {
1142 : /*
1143 : * There shouldn't be a read active already, but let's check just to be
1144 : * sure.
1145 : */
1146 3140128 : if (PqCommReadingMsg)
1147 0 : ereport(FATAL,
1148 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1149 : errmsg("terminating connection because protocol synchronization was lost")));
1150 :
1151 3140128 : PqCommReadingMsg = true;
1152 3140128 : }
1153 :
1154 :
1155 : /* --------------------------------
1156 : * pq_endmsgread - finish reading message.
1157 : *
1158 : * This must be called after reading a message with pq_getbytes()
1159 : * and friends, to indicate that we have read the whole message.
1160 : * pq_getmessage() does this implicitly.
1161 : * --------------------------------
1162 : */
1163 : void
1164 1929138 : pq_endmsgread(void)
1165 : {
1166 : Assert(PqCommReadingMsg);
1167 :
1168 1929138 : PqCommReadingMsg = false;
1169 1929138 : }
1170 :
1171 : /* --------------------------------
1172 : * pq_is_reading_msg - are we currently reading a message?
1173 : *
1174 : * This is used in error recovery at the outer idle loop to detect if we have
1175 : * lost protocol sync, and need to terminate the connection. pq_startmsgread()
1176 : * will check for that too, but it's nicer to detect it earlier.
1177 : * --------------------------------
1178 : */
1179 : bool
1180 39946 : pq_is_reading_msg(void)
1181 : {
1182 39946 : return PqCommReadingMsg;
1183 : }
1184 :
1185 : /* --------------------------------
1186 : * pq_getmessage - get a message with length word from connection
1187 : *
1188 : * The return value is placed in an expansible StringInfo, which has
1189 : * already been initialized by the caller.
1190 : * Only the message body is placed in the StringInfo; the length word
1191 : * is removed. Also, s->cursor is initialized to zero for convenience
1192 : * in scanning the message contents.
1193 : *
1194 : * maxlen is the upper limit on the length of the
1195 : * message we are willing to accept. We abort the connection (by
1196 : * returning EOF) if client tries to send more than that.
1197 : *
1198 : * returns 0 if OK, EOF if trouble
1199 : * --------------------------------
1200 : */
1201 : int
1202 1210746 : pq_getmessage(StringInfo s, int maxlen)
1203 : {
1204 : int32 len;
1205 :
1206 : Assert(PqCommReadingMsg);
1207 :
1208 1210746 : resetStringInfo(s);
1209 :
1210 : /* Read message length word */
1211 1210746 : if (pq_getbytes((char *) &len, 4) == EOF)
1212 : {
1213 0 : ereport(COMMERROR,
1214 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1215 : errmsg("unexpected EOF within message length word")));
1216 0 : return EOF;
1217 : }
1218 :
1219 1210746 : len = pg_ntoh32(len);
1220 :
1221 1210746 : if (len < 4 || len > maxlen)
1222 : {
1223 0 : ereport(COMMERROR,
1224 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1225 : errmsg("invalid message length")));
1226 0 : return EOF;
1227 : }
1228 :
1229 1210746 : len -= 4; /* discount length itself */
1230 :
1231 1210746 : if (len > 0)
1232 : {
1233 : /*
1234 : * Allocate space for message. If we run out of room (ridiculously
1235 : * large message), we will elog(ERROR), but we want to discard the
1236 : * message body so as not to lose communication sync.
1237 : */
1238 1168054 : PG_TRY();
1239 : {
1240 1168054 : enlargeStringInfo(s, len);
1241 : }
1242 0 : PG_CATCH();
1243 : {
1244 0 : if (pq_discardbytes(len) == EOF)
1245 0 : ereport(COMMERROR,
1246 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1247 : errmsg("incomplete message from client")));
1248 :
1249 : /* we discarded the rest of the message so we're back in sync. */
1250 0 : PqCommReadingMsg = false;
1251 0 : PG_RE_THROW();
1252 : }
1253 1168054 : PG_END_TRY();
1254 :
1255 : /* And grab the message */
1256 1168054 : if (pq_getbytes(s->data, len) == EOF)
1257 : {
1258 0 : ereport(COMMERROR,
1259 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1260 : errmsg("incomplete message from client")));
1261 0 : return EOF;
1262 : }
1263 1168054 : s->len = len;
1264 : /* Place a trailing null per StringInfo convention */
1265 1168054 : s->data[len] = '\0';
1266 : }
1267 :
1268 : /* finished reading the message. */
1269 1210746 : PqCommReadingMsg = false;
1270 :
1271 1210746 : return 0;
1272 : }
1273 :
1274 :
1275 : static inline int
1276 36760308 : internal_putbytes(const char *s, size_t len)
1277 : {
1278 73805372 : while (len > 0)
1279 : {
1280 : /* If buffer is full, then flush it out */
1281 37045086 : if (PqSendPointer >= PqSendBufferSize)
1282 : {
1283 338558 : socket_set_nonblocking(false);
1284 338558 : if (internal_flush())
1285 20 : return EOF;
1286 : }
1287 :
1288 : /*
1289 : * If the buffer is empty and data length is larger than the buffer
1290 : * size, send it without buffering. Otherwise, copy as much data as
1291 : * possible into the buffer.
1292 : */
1293 37045066 : if (len >= PqSendBufferSize && PqSendStart == PqSendPointer)
1294 189482 : {
1295 189484 : size_t start = 0;
1296 :
1297 189484 : socket_set_nonblocking(false);
1298 189484 : if (internal_flush_buffer(s, &start, &len))
1299 2 : return EOF;
1300 : }
1301 : else
1302 : {
1303 36855582 : size_t amount = PqSendBufferSize - PqSendPointer;
1304 :
1305 36855582 : if (amount > len)
1306 36505000 : amount = len;
1307 36855582 : memcpy(PqSendBuffer + PqSendPointer, s, amount);
1308 36855582 : PqSendPointer += amount;
1309 36855582 : s += amount;
1310 36855582 : len -= amount;
1311 : }
1312 : }
1313 :
1314 36760286 : return 0;
1315 : }
1316 :
1317 : /* --------------------------------
1318 : * socket_flush - flush pending output
1319 : *
1320 : * returns 0 if OK, EOF if trouble
1321 : * --------------------------------
1322 : */
1323 : static int
1324 638896 : socket_flush(void)
1325 : {
1326 : int res;
1327 :
1328 : /* No-op if reentrant call */
1329 638896 : if (PqCommBusy)
1330 0 : return 0;
1331 638896 : PqCommBusy = true;
1332 638896 : socket_set_nonblocking(false);
1333 638896 : res = internal_flush();
1334 638896 : PqCommBusy = false;
1335 638896 : return res;
1336 : }
1337 :
1338 : /* --------------------------------
1339 : * internal_flush - flush pending output
1340 : *
1341 : * Returns 0 if OK (meaning everything was sent, or operation would block
1342 : * and the socket is in non-blocking mode), or EOF if trouble.
1343 : * --------------------------------
1344 : */
1345 : static inline int
1346 1417966 : internal_flush(void)
1347 : {
1348 1417966 : return internal_flush_buffer(PqSendBuffer, &PqSendStart, &PqSendPointer);
1349 : }
1350 :
1351 : /* --------------------------------
1352 : * internal_flush_buffer - flush the given buffer content
1353 : *
1354 : * Returns 0 if OK (meaning everything was sent, or operation would block
1355 : * and the socket is in non-blocking mode), or EOF if trouble.
1356 : * --------------------------------
1357 : */
1358 : static pg_noinline int
1359 1607450 : internal_flush_buffer(const char *buf, size_t *start, size_t *end)
1360 : {
1361 : static int last_reported_send_errno = 0;
1362 :
1363 1607450 : const char *bufptr = buf + *start;
1364 1607450 : const char *bufend = buf + *end;
1365 :
1366 3217252 : while (bufptr < bufend)
1367 : {
1368 : int r;
1369 :
1370 1614464 : r = secure_write(MyProcPort, (char *) bufptr, bufend - bufptr);
1371 :
1372 1614464 : if (r <= 0)
1373 : {
1374 4662 : if (errno == EINTR)
1375 0 : continue; /* Ok if we were interrupted */
1376 :
1377 : /*
1378 : * Ok if no data writable without blocking, and the socket is in
1379 : * non-blocking mode.
1380 : */
1381 4662 : if (errno == EAGAIN ||
1382 78 : errno == EWOULDBLOCK)
1383 : {
1384 4584 : return 0;
1385 : }
1386 :
1387 : /*
1388 : * Careful: an ereport() that tries to write to the client would
1389 : * cause recursion to here, leading to stack overflow and core
1390 : * dump! This message must go *only* to the postmaster log.
1391 : *
1392 : * If a client disconnects while we're in the midst of output, we
1393 : * might write quite a bit of data before we get to a safe query
1394 : * abort point. So, suppress duplicate log messages.
1395 : */
1396 78 : if (errno != last_reported_send_errno)
1397 : {
1398 66 : last_reported_send_errno = errno;
1399 66 : ereport(COMMERROR,
1400 : (errcode_for_socket_access(),
1401 : errmsg("could not send data to client: %m")));
1402 : }
1403 :
1404 : /*
1405 : * We drop the buffered data anyway so that processing can
1406 : * continue, even though we'll probably quit soon. We also set a
1407 : * flag that'll cause the next CHECK_FOR_INTERRUPTS to terminate
1408 : * the connection.
1409 : */
1410 78 : *start = *end = 0;
1411 78 : ClientConnectionLost = 1;
1412 78 : InterruptPending = 1;
1413 78 : return EOF;
1414 : }
1415 :
1416 1609802 : last_reported_send_errno = 0; /* reset after any successful send */
1417 1609802 : bufptr += r;
1418 1609802 : *start += r;
1419 : }
1420 :
1421 1602788 : *start = *end = 0;
1422 1602788 : return 0;
1423 : }
1424 :
1425 : /* --------------------------------
1426 : * pq_flush_if_writable - flush pending output if writable without blocking
1427 : *
1428 : * Returns 0 if OK, or EOF if trouble.
1429 : * --------------------------------
1430 : */
1431 : static int
1432 2229114 : socket_flush_if_writable(void)
1433 : {
1434 : int res;
1435 :
1436 : /* Quick exit if nothing to do */
1437 2229114 : if (PqSendPointer == PqSendStart)
1438 1788602 : return 0;
1439 :
1440 : /* No-op if reentrant call */
1441 440512 : if (PqCommBusy)
1442 0 : return 0;
1443 :
1444 : /* Temporarily put the socket into non-blocking mode */
1445 440512 : socket_set_nonblocking(true);
1446 :
1447 440512 : PqCommBusy = true;
1448 440512 : res = internal_flush();
1449 440512 : PqCommBusy = false;
1450 440512 : return res;
1451 : }
1452 :
1453 : /* --------------------------------
1454 : * socket_is_send_pending - is there any pending data in the output buffer?
1455 : * --------------------------------
1456 : */
1457 : static bool
1458 4274832 : socket_is_send_pending(void)
1459 : {
1460 4274832 : return (PqSendStart < PqSendPointer);
1461 : }
1462 :
1463 : /* --------------------------------
1464 : * Message-level I/O routines begin here.
1465 : * --------------------------------
1466 : */
1467 :
1468 :
1469 : /* --------------------------------
1470 : * socket_putmessage - send a normal message (suppressed in COPY OUT mode)
1471 : *
1472 : * msgtype is a message type code to place before the message body.
1473 : *
1474 : * len is the length of the message body data at *s. A message length
1475 : * word (equal to len+4 because it counts itself too) is inserted by this
1476 : * routine.
1477 : *
1478 : * We suppress messages generated while pqcomm.c is busy. This
1479 : * avoids any possibility of messages being inserted within other
1480 : * messages. The only known trouble case arises if SIGQUIT occurs
1481 : * during a pqcomm.c routine --- quickdie() will try to send a warning
1482 : * message, and the most reasonable approach seems to be to drop it.
1483 : *
1484 : * returns 0 if OK, EOF if trouble
1485 : * --------------------------------
1486 : */
1487 : static int
1488 12253436 : socket_putmessage(char msgtype, const char *s, size_t len)
1489 : {
1490 : uint32 n32;
1491 :
1492 : Assert(msgtype != 0);
1493 :
1494 12253436 : if (PqCommBusy)
1495 0 : return 0;
1496 12253436 : PqCommBusy = true;
1497 12253436 : if (internal_putbytes(&msgtype, 1))
1498 0 : goto fail;
1499 :
1500 12253436 : n32 = pg_hton32((uint32) (len + 4));
1501 12253436 : if (internal_putbytes((char *) &n32, 4))
1502 0 : goto fail;
1503 :
1504 12253436 : if (internal_putbytes(s, len))
1505 22 : goto fail;
1506 12253414 : PqCommBusy = false;
1507 12253414 : return 0;
1508 :
1509 22 : fail:
1510 22 : PqCommBusy = false;
1511 22 : return EOF;
1512 : }
1513 :
1514 : /* --------------------------------
1515 : * pq_putmessage_noblock - like pq_putmessage, but never blocks
1516 : *
1517 : * If the output buffer is too small to hold the message, the buffer
1518 : * is enlarged.
1519 : */
1520 : static void
1521 435802 : socket_putmessage_noblock(char msgtype, const char *s, size_t len)
1522 : {
1523 : int res PG_USED_FOR_ASSERTS_ONLY;
1524 : int required;
1525 :
1526 : /*
1527 : * Ensure we have enough space in the output buffer for the message header
1528 : * as well as the message itself.
1529 : */
1530 435802 : required = PqSendPointer + 1 + 4 + len;
1531 435802 : if (required > PqSendBufferSize)
1532 : {
1533 840 : PqSendBuffer = repalloc(PqSendBuffer, required);
1534 840 : PqSendBufferSize = required;
1535 : }
1536 435802 : res = pq_putmessage(msgtype, s, len);
1537 : Assert(res == 0); /* should not fail when the message fits in
1538 : * buffer */
1539 435802 : }
1540 :
1541 : /* --------------------------------
1542 : * pq_putmessage_v2 - send a message in protocol version 2
1543 : *
1544 : * msgtype is a message type code to place before the message body.
1545 : *
1546 : * We no longer support protocol version 2, but we have kept this
1547 : * function so that if a client tries to connect with protocol version 2,
1548 : * as a courtesy we can still send the "unsupported protocol version"
1549 : * error to the client in the old format.
1550 : *
1551 : * Like in pq_putmessage(), we suppress messages generated while
1552 : * pqcomm.c is busy.
1553 : *
1554 : * returns 0 if OK, EOF if trouble
1555 : * --------------------------------
1556 : */
1557 : int
1558 0 : pq_putmessage_v2(char msgtype, const char *s, size_t len)
1559 : {
1560 : Assert(msgtype != 0);
1561 :
1562 0 : if (PqCommBusy)
1563 0 : return 0;
1564 0 : PqCommBusy = true;
1565 0 : if (internal_putbytes(&msgtype, 1))
1566 0 : goto fail;
1567 :
1568 0 : if (internal_putbytes(s, len))
1569 0 : goto fail;
1570 0 : PqCommBusy = false;
1571 0 : return 0;
1572 :
1573 0 : fail:
1574 0 : PqCommBusy = false;
1575 0 : return EOF;
1576 : }
1577 :
1578 : /*
1579 : * Support for TCP Keepalive parameters
1580 : */
1581 :
1582 : /*
1583 : * On Windows, we need to set both idle and interval at the same time.
1584 : * We also cannot reset them to the default (setting to zero will
1585 : * actually set them to zero, not default), therefore we fallback to
1586 : * the out-of-the-box default instead.
1587 : */
1588 : #if defined(WIN32) && defined(SIO_KEEPALIVE_VALS)
1589 : static int
1590 : pq_setkeepaliveswin32(Port *port, int idle, int interval)
1591 : {
1592 : struct tcp_keepalive ka;
1593 : DWORD retsize;
1594 :
1595 : if (idle <= 0)
1596 : idle = 2 * 60 * 60; /* default = 2 hours */
1597 : if (interval <= 0)
1598 : interval = 1; /* default = 1 second */
1599 :
1600 : ka.onoff = 1;
1601 : ka.keepalivetime = idle * 1000;
1602 : ka.keepaliveinterval = interval * 1000;
1603 :
1604 : if (WSAIoctl(port->sock,
1605 : SIO_KEEPALIVE_VALS,
1606 : (LPVOID) &ka,
1607 : sizeof(ka),
1608 : NULL,
1609 : 0,
1610 : &retsize,
1611 : NULL,
1612 : NULL)
1613 : != 0)
1614 : {
1615 : ereport(LOG,
1616 : (errmsg("%s(%s) failed: error code %d",
1617 : "WSAIoctl", "SIO_KEEPALIVE_VALS", WSAGetLastError())));
1618 : return STATUS_ERROR;
1619 : }
1620 : if (port->keepalives_idle != idle)
1621 : port->keepalives_idle = idle;
1622 : if (port->keepalives_interval != interval)
1623 : port->keepalives_interval = interval;
1624 : return STATUS_OK;
1625 : }
1626 : #endif
1627 :
1628 : int
1629 3886 : pq_getkeepalivesidle(Port *port)
1630 : {
1631 : #if defined(PG_TCP_KEEPALIVE_IDLE) || defined(SIO_KEEPALIVE_VALS)
1632 3886 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1633 3886 : return 0;
1634 :
1635 0 : if (port->keepalives_idle != 0)
1636 0 : return port->keepalives_idle;
1637 :
1638 0 : if (port->default_keepalives_idle == 0)
1639 : {
1640 : #ifndef WIN32
1641 0 : socklen_t size = sizeof(port->default_keepalives_idle);
1642 :
1643 0 : if (getsockopt(port->sock, IPPROTO_TCP, PG_TCP_KEEPALIVE_IDLE,
1644 0 : (char *) &port->default_keepalives_idle,
1645 : &size) < 0)
1646 : {
1647 0 : ereport(LOG,
1648 : (errmsg("%s(%s) failed: %m", "getsockopt", PG_TCP_KEEPALIVE_IDLE_STR)));
1649 0 : port->default_keepalives_idle = -1; /* don't know */
1650 : }
1651 : #else /* WIN32 */
1652 : /* We can't get the defaults on Windows, so return "don't know" */
1653 : port->default_keepalives_idle = -1;
1654 : #endif /* WIN32 */
1655 : }
1656 :
1657 0 : return port->default_keepalives_idle;
1658 : #else
1659 : return 0;
1660 : #endif
1661 : }
1662 :
1663 : int
1664 2346 : pq_setkeepalivesidle(int idle, Port *port)
1665 : {
1666 2346 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1667 1830 : return STATUS_OK;
1668 :
1669 : /* check SIO_KEEPALIVE_VALS here, not just WIN32, as some toolchains lack it */
1670 : #if defined(PG_TCP_KEEPALIVE_IDLE) || defined(SIO_KEEPALIVE_VALS)
1671 516 : if (idle == port->keepalives_idle)
1672 516 : return STATUS_OK;
1673 :
1674 : #ifndef WIN32
1675 0 : if (port->default_keepalives_idle <= 0)
1676 : {
1677 0 : if (pq_getkeepalivesidle(port) < 0)
1678 : {
1679 0 : if (idle == 0)
1680 0 : return STATUS_OK; /* default is set but unknown */
1681 : else
1682 0 : return STATUS_ERROR;
1683 : }
1684 : }
1685 :
1686 0 : if (idle == 0)
1687 0 : idle = port->default_keepalives_idle;
1688 :
1689 0 : if (setsockopt(port->sock, IPPROTO_TCP, PG_TCP_KEEPALIVE_IDLE,
1690 : (char *) &idle, sizeof(idle)) < 0)
1691 : {
1692 0 : ereport(LOG,
1693 : (errmsg("%s(%s) failed: %m", "setsockopt", PG_TCP_KEEPALIVE_IDLE_STR)));
1694 0 : return STATUS_ERROR;
1695 : }
1696 :
1697 0 : port->keepalives_idle = idle;
1698 : #else /* WIN32 */
1699 : return pq_setkeepaliveswin32(port, idle, port->keepalives_interval);
1700 : #endif
1701 : #else
1702 : if (idle != 0)
1703 : {
1704 : ereport(LOG,
1705 : (errmsg("setting the keepalive idle time is not supported")));
1706 : return STATUS_ERROR;
1707 : }
1708 : #endif
1709 :
1710 0 : return STATUS_OK;
1711 : }
1712 :
1713 : int
1714 3886 : pq_getkeepalivesinterval(Port *port)
1715 : {
1716 : #if defined(TCP_KEEPINTVL) || defined(SIO_KEEPALIVE_VALS)
1717 3886 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1718 3886 : return 0;
1719 :
1720 0 : if (port->keepalives_interval != 0)
1721 0 : return port->keepalives_interval;
1722 :
1723 0 : if (port->default_keepalives_interval == 0)
1724 : {
1725 : #ifndef WIN32
1726 0 : socklen_t size = sizeof(port->default_keepalives_interval);
1727 :
1728 0 : if (getsockopt(port->sock, IPPROTO_TCP, TCP_KEEPINTVL,
1729 0 : (char *) &port->default_keepalives_interval,
1730 : &size) < 0)
1731 : {
1732 0 : ereport(LOG,
1733 : (errmsg("%s(%s) failed: %m", "getsockopt", "TCP_KEEPINTVL")));
1734 0 : port->default_keepalives_interval = -1; /* don't know */
1735 : }
1736 : #else
1737 : /* We can't get the defaults on Windows, so return "don't know" */
1738 : port->default_keepalives_interval = -1;
1739 : #endif /* WIN32 */
1740 : }
1741 :
1742 0 : return port->default_keepalives_interval;
1743 : #else
1744 : return 0;
1745 : #endif
1746 : }
1747 :
1748 : int
1749 2346 : pq_setkeepalivesinterval(int interval, Port *port)
1750 : {
1751 2346 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1752 1830 : return STATUS_OK;
1753 :
1754 : #if defined(TCP_KEEPINTVL) || defined(SIO_KEEPALIVE_VALS)
1755 516 : if (interval == port->keepalives_interval)
1756 516 : return STATUS_OK;
1757 :
1758 : #ifndef WIN32
1759 0 : if (port->default_keepalives_interval <= 0)
1760 : {
1761 0 : if (pq_getkeepalivesinterval(port) < 0)
1762 : {
1763 0 : if (interval == 0)
1764 0 : return STATUS_OK; /* default is set but unknown */
1765 : else
1766 0 : return STATUS_ERROR;
1767 : }
1768 : }
1769 :
1770 0 : if (interval == 0)
1771 0 : interval = port->default_keepalives_interval;
1772 :
1773 0 : if (setsockopt(port->sock, IPPROTO_TCP, TCP_KEEPINTVL,
1774 : (char *) &interval, sizeof(interval)) < 0)
1775 : {
1776 0 : ereport(LOG,
1777 : (errmsg("%s(%s) failed: %m", "setsockopt", "TCP_KEEPINTVL")));
1778 0 : return STATUS_ERROR;
1779 : }
1780 :
1781 0 : port->keepalives_interval = interval;
1782 : #else /* WIN32 */
1783 : return pq_setkeepaliveswin32(port, port->keepalives_idle, interval);
1784 : #endif
1785 : #else
1786 : if (interval != 0)
1787 : {
1788 : ereport(LOG,
1789 : (errmsg("%s(%s) not supported", "setsockopt", "TCP_KEEPINTVL")));
1790 : return STATUS_ERROR;
1791 : }
1792 : #endif
1793 :
1794 0 : return STATUS_OK;
1795 : }
1796 :
1797 : int
1798 3886 : pq_getkeepalivescount(Port *port)
1799 : {
1800 : #ifdef TCP_KEEPCNT
1801 3886 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1802 3886 : return 0;
1803 :
1804 0 : if (port->keepalives_count != 0)
1805 0 : return port->keepalives_count;
1806 :
1807 0 : if (port->default_keepalives_count == 0)
1808 : {
1809 0 : socklen_t size = sizeof(port->default_keepalives_count);
1810 :
1811 0 : if (getsockopt(port->sock, IPPROTO_TCP, TCP_KEEPCNT,
1812 0 : (char *) &port->default_keepalives_count,
1813 : &size) < 0)
1814 : {
1815 0 : ereport(LOG,
1816 : (errmsg("%s(%s) failed: %m", "getsockopt", "TCP_KEEPCNT")));
1817 0 : port->default_keepalives_count = -1; /* don't know */
1818 : }
1819 : }
1820 :
1821 0 : return port->default_keepalives_count;
1822 : #else
1823 : return 0;
1824 : #endif
1825 : }
1826 :
1827 : int
1828 2346 : pq_setkeepalivescount(int count, Port *port)
1829 : {
1830 2346 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1831 1830 : return STATUS_OK;
1832 :
1833 : #ifdef TCP_KEEPCNT
1834 516 : if (count == port->keepalives_count)
1835 516 : return STATUS_OK;
1836 :
1837 0 : if (port->default_keepalives_count <= 0)
1838 : {
1839 0 : if (pq_getkeepalivescount(port) < 0)
1840 : {
1841 0 : if (count == 0)
1842 0 : return STATUS_OK; /* default is set but unknown */
1843 : else
1844 0 : return STATUS_ERROR;
1845 : }
1846 : }
1847 :
1848 0 : if (count == 0)
1849 0 : count = port->default_keepalives_count;
1850 :
1851 0 : if (setsockopt(port->sock, IPPROTO_TCP, TCP_KEEPCNT,
1852 : (char *) &count, sizeof(count)) < 0)
1853 : {
1854 0 : ereport(LOG,
1855 : (errmsg("%s(%s) failed: %m", "setsockopt", "TCP_KEEPCNT")));
1856 0 : return STATUS_ERROR;
1857 : }
1858 :
1859 0 : port->keepalives_count = count;
1860 : #else
1861 : if (count != 0)
1862 : {
1863 : ereport(LOG,
1864 : (errmsg("%s(%s) not supported", "setsockopt", "TCP_KEEPCNT")));
1865 : return STATUS_ERROR;
1866 : }
1867 : #endif
1868 :
1869 0 : return STATUS_OK;
1870 : }
1871 :
1872 : int
1873 3886 : pq_gettcpusertimeout(Port *port)
1874 : {
1875 : #ifdef TCP_USER_TIMEOUT
1876 3886 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1877 3886 : return 0;
1878 :
1879 0 : if (port->tcp_user_timeout != 0)
1880 0 : return port->tcp_user_timeout;
1881 :
1882 0 : if (port->default_tcp_user_timeout == 0)
1883 : {
1884 0 : socklen_t size = sizeof(port->default_tcp_user_timeout);
1885 :
1886 0 : if (getsockopt(port->sock, IPPROTO_TCP, TCP_USER_TIMEOUT,
1887 0 : (char *) &port->default_tcp_user_timeout,
1888 : &size) < 0)
1889 : {
1890 0 : ereport(LOG,
1891 : (errmsg("%s(%s) failed: %m", "getsockopt", "TCP_USER_TIMEOUT")));
1892 0 : port->default_tcp_user_timeout = -1; /* don't know */
1893 : }
1894 : }
1895 :
1896 0 : return port->default_tcp_user_timeout;
1897 : #else
1898 : return 0;
1899 : #endif
1900 : }
1901 :
1902 : int
1903 2346 : pq_settcpusertimeout(int timeout, Port *port)
1904 : {
1905 2346 : if (port == NULL || port->laddr.addr.ss_family == AF_UNIX)
1906 1830 : return STATUS_OK;
1907 :
1908 : #ifdef TCP_USER_TIMEOUT
1909 516 : if (timeout == port->tcp_user_timeout)
1910 516 : return STATUS_OK;
1911 :
1912 0 : if (port->default_tcp_user_timeout <= 0)
1913 : {
1914 0 : if (pq_gettcpusertimeout(port) < 0)
1915 : {
1916 0 : if (timeout == 0)
1917 0 : return STATUS_OK; /* default is set but unknown */
1918 : else
1919 0 : return STATUS_ERROR;
1920 : }
1921 : }
1922 :
1923 0 : if (timeout == 0)
1924 0 : timeout = port->default_tcp_user_timeout;
1925 :
1926 0 : if (setsockopt(port->sock, IPPROTO_TCP, TCP_USER_TIMEOUT,
1927 : (char *) &timeout, sizeof(timeout)) < 0)
1928 : {
1929 0 : ereport(LOG,
1930 : (errmsg("%s(%s) failed: %m", "setsockopt", "TCP_USER_TIMEOUT")));
1931 0 : return STATUS_ERROR;
1932 : }
1933 :
1934 0 : port->tcp_user_timeout = timeout;
1935 : #else
1936 : if (timeout != 0)
1937 : {
1938 : ereport(LOG,
1939 : (errmsg("%s(%s) not supported", "setsockopt", "TCP_USER_TIMEOUT")));
1940 : return STATUS_ERROR;
1941 : }
1942 : #endif
1943 :
1944 0 : return STATUS_OK;
1945 : }
1946 :
1947 : /*
1948 : * GUC assign_hook for tcp_keepalives_idle
1949 : */
1950 : void
1951 1830 : assign_tcp_keepalives_idle(int newval, void *extra)
1952 : {
1953 : /*
1954 : * The kernel API provides no way to test a value without setting it; and
1955 : * once we set it we might fail to unset it. So there seems little point
1956 : * in fully implementing the check-then-assign GUC API for these
1957 : * variables. Instead we just do the assignment on demand.
1958 : * pq_setkeepalivesidle reports any problems via ereport(LOG).
1959 : *
1960 : * This approach means that the GUC value might have little to do with the
1961 : * actual kernel value, so we use a show_hook that retrieves the kernel
1962 : * value rather than trusting GUC's copy.
1963 : */
1964 1830 : (void) pq_setkeepalivesidle(newval, MyProcPort);
1965 1830 : }
1966 :
1967 : /*
1968 : * GUC show_hook for tcp_keepalives_idle
1969 : */
1970 : const char *
1971 3886 : show_tcp_keepalives_idle(void)
1972 : {
1973 : /* See comments in assign_tcp_keepalives_idle */
1974 : static char nbuf[16];
1975 :
1976 3886 : snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivesidle(MyProcPort));
1977 3886 : return nbuf;
1978 : }
1979 :
1980 : /*
1981 : * GUC assign_hook for tcp_keepalives_interval
1982 : */
1983 : void
1984 1830 : assign_tcp_keepalives_interval(int newval, void *extra)
1985 : {
1986 : /* See comments in assign_tcp_keepalives_idle */
1987 1830 : (void) pq_setkeepalivesinterval(newval, MyProcPort);
1988 1830 : }
1989 :
1990 : /*
1991 : * GUC show_hook for tcp_keepalives_interval
1992 : */
1993 : const char *
1994 3886 : show_tcp_keepalives_interval(void)
1995 : {
1996 : /* See comments in assign_tcp_keepalives_idle */
1997 : static char nbuf[16];
1998 :
1999 3886 : snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivesinterval(MyProcPort));
2000 3886 : return nbuf;
2001 : }
2002 :
2003 : /*
2004 : * GUC assign_hook for tcp_keepalives_count
2005 : */
2006 : void
2007 1830 : assign_tcp_keepalives_count(int newval, void *extra)
2008 : {
2009 : /* See comments in assign_tcp_keepalives_idle */
2010 1830 : (void) pq_setkeepalivescount(newval, MyProcPort);
2011 1830 : }
2012 :
2013 : /*
2014 : * GUC show_hook for tcp_keepalives_count
2015 : */
2016 : const char *
2017 3886 : show_tcp_keepalives_count(void)
2018 : {
2019 : /* See comments in assign_tcp_keepalives_idle */
2020 : static char nbuf[16];
2021 :
2022 3886 : snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivescount(MyProcPort));
2023 3886 : return nbuf;
2024 : }
2025 :
2026 : /*
2027 : * GUC assign_hook for tcp_user_timeout
2028 : */
2029 : void
2030 1830 : assign_tcp_user_timeout(int newval, void *extra)
2031 : {
2032 : /* See comments in assign_tcp_keepalives_idle */
2033 1830 : (void) pq_settcpusertimeout(newval, MyProcPort);
2034 1830 : }
2035 :
2036 : /*
2037 : * GUC show_hook for tcp_user_timeout
2038 : */
2039 : const char *
2040 3886 : show_tcp_user_timeout(void)
2041 : {
2042 : /* See comments in assign_tcp_keepalives_idle */
2043 : static char nbuf[16];
2044 :
2045 3886 : snprintf(nbuf, sizeof(nbuf), "%d", pq_gettcpusertimeout(MyProcPort));
2046 3886 : return nbuf;
2047 : }
2048 :
2049 : /*
2050 : * Check if the client is still connected.
2051 : */
2052 : bool
2053 0 : pq_check_connection(void)
2054 : {
2055 : WaitEvent events[FeBeWaitSetNEvents];
2056 : int rc;
2057 :
2058 : /*
2059 : * It's OK to modify the socket event filter without restoring, because
2060 : * all FeBeWaitSet socket wait sites do the same.
2061 : */
2062 0 : ModifyWaitEvent(FeBeWaitSet, FeBeWaitSetSocketPos, WL_SOCKET_CLOSED, NULL);
2063 :
2064 0 : retry:
2065 0 : rc = WaitEventSetWait(FeBeWaitSet, 0, events, lengthof(events), 0);
2066 0 : for (int i = 0; i < rc; ++i)
2067 : {
2068 0 : if (events[i].events & WL_SOCKET_CLOSED)
2069 0 : return false;
2070 0 : if (events[i].events & WL_LATCH_SET)
2071 : {
2072 : /*
2073 : * A latch event might be preventing other events from being
2074 : * reported. Reset it and poll again. No need to restore it
2075 : * because no code should expect latches to survive across
2076 : * CHECK_FOR_INTERRUPTS().
2077 : */
2078 0 : ResetLatch(MyLatch);
2079 0 : goto retry;
2080 : }
2081 : }
2082 :
2083 0 : return true;
2084 : }
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