Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * pg_receivewal.c - receive streaming WAL data and write it
4 : * to a local file.
5 : *
6 : * Author: Magnus Hagander <magnus@hagander.net>
7 : *
8 : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
9 : *
10 : * IDENTIFICATION
11 : * src/bin/pg_basebackup/pg_receivewal.c
12 : *-------------------------------------------------------------------------
13 : */
14 :
15 : #include "postgres_fe.h"
16 :
17 : #include <dirent.h>
18 : #include <limits.h>
19 : #include <signal.h>
20 : #include <sys/stat.h>
21 : #include <unistd.h>
22 :
23 : #ifdef USE_LZ4
24 : #include <lz4frame.h>
25 : #endif
26 : #ifdef HAVE_LIBZ
27 : #include <zlib.h>
28 : #endif
29 :
30 : #include "access/xlog_internal.h"
31 : #include "common/file_perm.h"
32 : #include "common/logging.h"
33 : #include "fe_utils/option_utils.h"
34 : #include "getopt_long.h"
35 : #include "libpq-fe.h"
36 : #include "receivelog.h"
37 : #include "streamutil.h"
38 :
39 : /* Time to sleep between reconnection attempts */
40 : #define RECONNECT_SLEEP_TIME 5
41 :
42 : /* Global options */
43 : static char *basedir = NULL;
44 : static int verbose = 0;
45 : static int compresslevel = 0;
46 : static bool noloop = false;
47 : static int standby_message_timeout = 10 * 1000; /* 10 sec = default */
48 : static volatile sig_atomic_t time_to_stop = false;
49 : static bool do_create_slot = false;
50 : static bool slot_exists_ok = false;
51 : static bool do_drop_slot = false;
52 : static bool do_sync = true;
53 : static bool synchronous = false;
54 : static char *replication_slot = NULL;
55 : static pg_compress_algorithm compression_algorithm = PG_COMPRESSION_NONE;
56 : static XLogRecPtr endpos = InvalidXLogRecPtr;
57 :
58 :
59 : static void usage(void);
60 : static DIR *get_destination_dir(char *dest_folder);
61 : static void close_destination_dir(DIR *dest_dir, char *dest_folder);
62 : static XLogRecPtr FindStreamingStart(uint32 *tli);
63 : static void StreamLog(void);
64 : static bool stop_streaming(XLogRecPtr xlogpos, uint32 timeline,
65 : bool segment_finished);
66 :
67 : static void
68 0 : disconnect_atexit(void)
69 : {
70 0 : if (conn != NULL)
71 0 : PQfinish(conn);
72 0 : }
73 :
74 : static void
75 0 : usage(void)
76 : {
77 0 : printf(_("%s receives PostgreSQL streaming write-ahead logs.\n\n"),
78 : progname);
79 0 : printf(_("Usage:\n"));
80 0 : printf(_(" %s [OPTION]...\n"), progname);
81 0 : printf(_("\nOptions:\n"));
82 0 : printf(_(" -D, --directory=DIR receive write-ahead log files into this directory\n"));
83 0 : printf(_(" -E, --endpos=LSN exit after receiving the specified LSN\n"));
84 0 : printf(_(" --if-not-exists do not error if slot already exists when creating a slot\n"));
85 0 : printf(_(" -n, --no-loop do not loop on connection lost\n"));
86 0 : printf(_(" --no-sync do not wait for changes to be written safely to disk\n"));
87 0 : printf(_(" -s, --status-interval=SECS\n"
88 : " time between status packets sent to server (default: %d)\n"), (standby_message_timeout / 1000));
89 0 : printf(_(" -S, --slot=SLOTNAME replication slot to use\n"));
90 0 : printf(_(" --synchronous flush write-ahead log immediately after writing\n"));
91 0 : printf(_(" -v, --verbose output verbose messages\n"));
92 0 : printf(_(" -V, --version output version information, then exit\n"));
93 0 : printf(_(" -Z, --compress=METHOD[:DETAIL]\n"
94 : " compress as specified\n"));
95 0 : printf(_(" -?, --help show this help, then exit\n"));
96 0 : printf(_("\nConnection options:\n"));
97 0 : printf(_(" -d, --dbname=CONNSTR connection string\n"));
98 0 : printf(_(" -h, --host=HOSTNAME database server host or socket directory\n"));
99 0 : printf(_(" -p, --port=PORT database server port number\n"));
100 0 : printf(_(" -U, --username=NAME connect as specified database user\n"));
101 0 : printf(_(" -w, --no-password never prompt for password\n"));
102 0 : printf(_(" -W, --password force password prompt (should happen automatically)\n"));
103 0 : printf(_("\nOptional actions:\n"));
104 0 : printf(_(" --create-slot create a new replication slot (for the slot's name see --slot)\n"));
105 0 : printf(_(" --drop-slot drop the replication slot (for the slot's name see --slot)\n"));
106 0 : printf(_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
107 0 : printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
108 0 : }
109 :
110 :
111 : /*
112 : * Check if the filename looks like a WAL file, letting caller know if this
113 : * WAL segment is partial and/or compressed.
114 : */
115 : static bool
116 0 : is_xlogfilename(const char *filename, bool *ispartial,
117 : pg_compress_algorithm *wal_compression_algorithm)
118 : {
119 0 : size_t fname_len = strlen(filename);
120 0 : size_t xlog_pattern_len = strspn(filename, "0123456789ABCDEF");
121 :
122 : /* File does not look like a WAL file */
123 0 : if (xlog_pattern_len != XLOG_FNAME_LEN)
124 0 : return false;
125 :
126 : /* File looks like a completed uncompressed WAL file */
127 0 : if (fname_len == XLOG_FNAME_LEN)
128 : {
129 0 : *ispartial = false;
130 0 : *wal_compression_algorithm = PG_COMPRESSION_NONE;
131 0 : return true;
132 : }
133 :
134 : /* File looks like a completed gzip-compressed WAL file */
135 0 : if (fname_len == XLOG_FNAME_LEN + strlen(".gz") &&
136 0 : strcmp(filename + XLOG_FNAME_LEN, ".gz") == 0)
137 : {
138 0 : *ispartial = false;
139 0 : *wal_compression_algorithm = PG_COMPRESSION_GZIP;
140 0 : return true;
141 : }
142 :
143 : /* File looks like a completed LZ4-compressed WAL file */
144 0 : if (fname_len == XLOG_FNAME_LEN + strlen(".lz4") &&
145 0 : strcmp(filename + XLOG_FNAME_LEN, ".lz4") == 0)
146 : {
147 0 : *ispartial = false;
148 0 : *wal_compression_algorithm = PG_COMPRESSION_LZ4;
149 0 : return true;
150 : }
151 :
152 : /* File looks like a partial uncompressed WAL file */
153 0 : if (fname_len == XLOG_FNAME_LEN + strlen(".partial") &&
154 0 : strcmp(filename + XLOG_FNAME_LEN, ".partial") == 0)
155 : {
156 0 : *ispartial = true;
157 0 : *wal_compression_algorithm = PG_COMPRESSION_NONE;
158 0 : return true;
159 : }
160 :
161 : /* File looks like a partial gzip-compressed WAL file */
162 0 : if (fname_len == XLOG_FNAME_LEN + strlen(".gz.partial") &&
163 0 : strcmp(filename + XLOG_FNAME_LEN, ".gz.partial") == 0)
164 : {
165 0 : *ispartial = true;
166 0 : *wal_compression_algorithm = PG_COMPRESSION_GZIP;
167 0 : return true;
168 : }
169 :
170 : /* File looks like a partial LZ4-compressed WAL file */
171 0 : if (fname_len == XLOG_FNAME_LEN + strlen(".lz4.partial") &&
172 0 : strcmp(filename + XLOG_FNAME_LEN, ".lz4.partial") == 0)
173 : {
174 0 : *ispartial = true;
175 0 : *wal_compression_algorithm = PG_COMPRESSION_LZ4;
176 0 : return true;
177 : }
178 :
179 : /* File does not look like something we know */
180 0 : return false;
181 0 : }
182 :
183 : static bool
184 0 : stop_streaming(XLogRecPtr xlogpos, uint32 timeline, bool segment_finished)
185 : {
186 : static uint32 prevtimeline = 0;
187 : static XLogRecPtr prevpos = InvalidXLogRecPtr;
188 :
189 : /* we assume that we get called once at the end of each segment */
190 0 : if (verbose && segment_finished)
191 0 : pg_log_info("finished segment at %X/%08X (timeline %u)",
192 : LSN_FORMAT_ARGS(xlogpos),
193 : timeline);
194 :
195 0 : if (XLogRecPtrIsValid(endpos) && endpos < xlogpos)
196 : {
197 0 : if (verbose)
198 0 : pg_log_info("stopped log streaming at %X/%08X (timeline %u)",
199 : LSN_FORMAT_ARGS(xlogpos),
200 : timeline);
201 0 : time_to_stop = true;
202 0 : return true;
203 : }
204 :
205 : /*
206 : * Note that we report the previous, not current, position here. After a
207 : * timeline switch, xlogpos points to the beginning of the segment because
208 : * that's where we always begin streaming. Reporting the end of previous
209 : * timeline isn't totally accurate, because the next timeline can begin
210 : * slightly before the end of the WAL that we received on the previous
211 : * timeline, but it's close enough for reporting purposes.
212 : */
213 0 : if (verbose && prevtimeline != 0 && prevtimeline != timeline)
214 0 : pg_log_info("switched to timeline %u at %X/%08X",
215 : timeline,
216 : LSN_FORMAT_ARGS(prevpos));
217 :
218 0 : prevtimeline = timeline;
219 0 : prevpos = xlogpos;
220 :
221 0 : if (time_to_stop)
222 : {
223 0 : if (verbose)
224 0 : pg_log_info("received interrupt signal, exiting");
225 0 : return true;
226 : }
227 0 : return false;
228 0 : }
229 :
230 :
231 : /*
232 : * Get destination directory.
233 : */
234 : static DIR *
235 0 : get_destination_dir(char *dest_folder)
236 : {
237 0 : DIR *dir;
238 :
239 0 : Assert(dest_folder != NULL);
240 0 : dir = opendir(dest_folder);
241 0 : if (dir == NULL)
242 0 : pg_fatal("could not open directory \"%s\": %m", dest_folder);
243 :
244 0 : return dir;
245 0 : }
246 :
247 :
248 : /*
249 : * Close existing directory.
250 : */
251 : static void
252 0 : close_destination_dir(DIR *dest_dir, char *dest_folder)
253 : {
254 0 : Assert(dest_dir != NULL && dest_folder != NULL);
255 0 : if (closedir(dest_dir))
256 0 : pg_fatal("could not close directory \"%s\": %m", dest_folder);
257 0 : }
258 :
259 :
260 : /*
261 : * Determine starting location for streaming, based on any existing xlog
262 : * segments in the directory. We start at the end of the last one that is
263 : * complete (size matches wal segment size), on the timeline with highest ID.
264 : *
265 : * If there are no WAL files in the directory, returns InvalidXLogRecPtr.
266 : */
267 : static XLogRecPtr
268 0 : FindStreamingStart(uint32 *tli)
269 : {
270 0 : DIR *dir;
271 0 : struct dirent *dirent;
272 0 : XLogSegNo high_segno = 0;
273 0 : uint32 high_tli = 0;
274 0 : bool high_ispartial = false;
275 :
276 0 : dir = get_destination_dir(basedir);
277 :
278 0 : while (errno = 0, (dirent = readdir(dir)) != NULL)
279 : {
280 0 : uint32 tli;
281 0 : XLogSegNo segno;
282 0 : pg_compress_algorithm wal_compression_algorithm;
283 0 : bool ispartial;
284 :
285 0 : if (!is_xlogfilename(dirent->d_name,
286 : &ispartial, &wal_compression_algorithm))
287 0 : continue;
288 :
289 : /*
290 : * Looks like an xlog file. Parse its position.
291 : */
292 0 : XLogFromFileName(dirent->d_name, &tli, &segno, WalSegSz);
293 :
294 : /*
295 : * Check that the segment has the right size, if it's supposed to be
296 : * completed. For non-compressed segments just check the on-disk size
297 : * and see if it matches a completed segment. For gzip-compressed
298 : * segments, look at the last 4 bytes of the compressed file, which is
299 : * where the uncompressed size is located for files with a size lower
300 : * than 4GB, and then compare it to the size of a completed segment.
301 : * The 4 last bytes correspond to the ISIZE member according to
302 : * http://www.zlib.org/rfc-gzip.html.
303 : *
304 : * For LZ4-compressed segments, uncompress the file in a throw-away
305 : * buffer keeping track of the uncompressed size, then compare it to
306 : * the size of a completed segment. Per its protocol, LZ4 does not
307 : * store the uncompressed size of an object by default. contentSize
308 : * is one possible way to do that, but we need to rely on a method
309 : * where WAL segments could have been compressed by a different source
310 : * than pg_receivewal, like an archive_command with lz4.
311 : */
312 0 : if (!ispartial && wal_compression_algorithm == PG_COMPRESSION_NONE)
313 : {
314 0 : struct stat statbuf;
315 0 : char fullpath[MAXPGPATH * 2];
316 :
317 0 : snprintf(fullpath, sizeof(fullpath), "%s/%s", basedir, dirent->d_name);
318 0 : if (stat(fullpath, &statbuf) != 0)
319 0 : pg_fatal("could not stat file \"%s\": %m", fullpath);
320 :
321 0 : if (statbuf.st_size != WalSegSz)
322 : {
323 0 : pg_log_warning("segment file \"%s\" has incorrect size %lld, skipping",
324 : dirent->d_name, (long long int) statbuf.st_size);
325 0 : continue;
326 : }
327 0 : }
328 0 : else if (!ispartial && wal_compression_algorithm == PG_COMPRESSION_GZIP)
329 : {
330 0 : int fd;
331 0 : char buf[4];
332 0 : int bytes_out;
333 0 : char fullpath[MAXPGPATH * 2];
334 0 : int r;
335 :
336 0 : snprintf(fullpath, sizeof(fullpath), "%s/%s", basedir, dirent->d_name);
337 :
338 0 : fd = open(fullpath, O_RDONLY | PG_BINARY, 0);
339 0 : if (fd < 0)
340 0 : pg_fatal("could not open compressed file \"%s\": %m",
341 : fullpath);
342 0 : if (lseek(fd, (off_t) (-4), SEEK_END) < 0)
343 0 : pg_fatal("could not seek in compressed file \"%s\": %m",
344 : fullpath);
345 0 : r = read(fd, buf, sizeof(buf));
346 0 : if (r != sizeof(buf))
347 : {
348 0 : if (r < 0)
349 0 : pg_fatal("could not read compressed file \"%s\": %m",
350 : fullpath);
351 : else
352 0 : pg_fatal("could not read compressed file \"%s\": read %d of %zu",
353 : fullpath, r, sizeof(buf));
354 0 : }
355 :
356 0 : close(fd);
357 0 : bytes_out = (buf[3] << 24) | (buf[2] << 16) |
358 0 : (buf[1] << 8) | buf[0];
359 :
360 0 : if (bytes_out != WalSegSz)
361 : {
362 0 : pg_log_warning("compressed segment file \"%s\" has incorrect uncompressed size %d, skipping",
363 : dirent->d_name, bytes_out);
364 0 : continue;
365 : }
366 0 : }
367 0 : else if (!ispartial && wal_compression_algorithm == PG_COMPRESSION_LZ4)
368 : {
369 : #ifdef USE_LZ4
370 : #define LZ4_CHUNK_SZ 64 * 1024 /* 64kB as maximum chunk size read */
371 0 : int fd;
372 0 : ssize_t r;
373 0 : size_t uncompressed_size = 0;
374 0 : char fullpath[MAXPGPATH * 2];
375 0 : char *outbuf;
376 0 : char *readbuf;
377 0 : LZ4F_decompressionContext_t ctx = NULL;
378 0 : LZ4F_decompressOptions_t dec_opt;
379 0 : LZ4F_errorCode_t status;
380 :
381 0 : memset(&dec_opt, 0, sizeof(dec_opt));
382 0 : snprintf(fullpath, sizeof(fullpath), "%s/%s", basedir, dirent->d_name);
383 :
384 0 : fd = open(fullpath, O_RDONLY | PG_BINARY, 0);
385 0 : if (fd < 0)
386 0 : pg_fatal("could not open file \"%s\": %m", fullpath);
387 :
388 0 : status = LZ4F_createDecompressionContext(&ctx, LZ4F_VERSION);
389 0 : if (LZ4F_isError(status))
390 0 : pg_fatal("could not create LZ4 decompression context: %s",
391 : LZ4F_getErrorName(status));
392 :
393 0 : outbuf = pg_malloc0(LZ4_CHUNK_SZ);
394 0 : readbuf = pg_malloc0(LZ4_CHUNK_SZ);
395 0 : do
396 : {
397 0 : char *readp;
398 0 : char *readend;
399 :
400 0 : r = read(fd, readbuf, LZ4_CHUNK_SZ);
401 0 : if (r < 0)
402 0 : pg_fatal("could not read file \"%s\": %m", fullpath);
403 :
404 : /* Done reading the file */
405 0 : if (r == 0)
406 0 : break;
407 :
408 : /* Process one chunk */
409 0 : readp = readbuf;
410 0 : readend = readbuf + r;
411 0 : while (readp < readend)
412 : {
413 0 : size_t out_size = LZ4_CHUNK_SZ;
414 0 : size_t read_size = readend - readp;
415 :
416 0 : memset(outbuf, 0, LZ4_CHUNK_SZ);
417 0 : status = LZ4F_decompress(ctx, outbuf, &out_size,
418 0 : readp, &read_size, &dec_opt);
419 0 : if (LZ4F_isError(status))
420 0 : pg_fatal("could not decompress file \"%s\": %s",
421 : fullpath,
422 : LZ4F_getErrorName(status));
423 :
424 0 : readp += read_size;
425 0 : uncompressed_size += out_size;
426 0 : }
427 :
428 : /*
429 : * No need to continue reading the file when the
430 : * uncompressed_size exceeds WalSegSz, even if there are still
431 : * data left to read. However, if uncompressed_size is equal
432 : * to WalSegSz, it should verify that there is no more data to
433 : * read.
434 : */
435 0 : } while (uncompressed_size <= WalSegSz && r > 0);
436 :
437 0 : close(fd);
438 0 : pg_free(outbuf);
439 0 : pg_free(readbuf);
440 :
441 0 : status = LZ4F_freeDecompressionContext(ctx);
442 0 : if (LZ4F_isError(status))
443 0 : pg_fatal("could not free LZ4 decompression context: %s",
444 : LZ4F_getErrorName(status));
445 :
446 0 : if (uncompressed_size != WalSegSz)
447 : {
448 0 : pg_log_warning("compressed segment file \"%s\" has incorrect uncompressed size %zu, skipping",
449 : dirent->d_name, uncompressed_size);
450 0 : continue;
451 : }
452 : #else
453 : pg_log_error("cannot check file \"%s\": compression with %s not supported by this build",
454 : dirent->d_name, "LZ4");
455 : exit(1);
456 : #endif
457 0 : }
458 :
459 : /* Looks like a valid segment. Remember that we saw it. */
460 0 : if ((segno > high_segno) ||
461 0 : (segno == high_segno && tli > high_tli) ||
462 0 : (segno == high_segno && tli == high_tli && high_ispartial && !ispartial))
463 : {
464 0 : high_segno = segno;
465 0 : high_tli = tli;
466 0 : high_ispartial = ispartial;
467 0 : }
468 0 : }
469 :
470 0 : if (errno)
471 0 : pg_fatal("could not read directory \"%s\": %m", basedir);
472 :
473 0 : close_destination_dir(dir, basedir);
474 :
475 0 : if (high_segno > 0)
476 : {
477 0 : XLogRecPtr high_ptr;
478 :
479 : /*
480 : * Move the starting pointer to the start of the next segment, if the
481 : * highest one we saw was completed. Otherwise start streaming from
482 : * the beginning of the .partial segment.
483 : */
484 0 : if (!high_ispartial)
485 0 : high_segno++;
486 :
487 0 : XLogSegNoOffsetToRecPtr(high_segno, 0, WalSegSz, high_ptr);
488 :
489 0 : *tli = high_tli;
490 0 : return high_ptr;
491 0 : }
492 : else
493 0 : return InvalidXLogRecPtr;
494 0 : }
495 :
496 : /*
497 : * Start the log streaming
498 : */
499 : static void
500 0 : StreamLog(void)
501 : {
502 0 : XLogRecPtr serverpos;
503 0 : TimeLineID servertli;
504 0 : StreamCtl stream = {0};
505 0 : char *sysidentifier;
506 :
507 : /*
508 : * Connect in replication mode to the server
509 : */
510 0 : if (conn == NULL)
511 0 : conn = GetConnection();
512 0 : if (!conn)
513 : /* Error message already written in GetConnection() */
514 0 : return;
515 :
516 0 : if (!CheckServerVersionForStreaming(conn))
517 : {
518 : /*
519 : * Error message already written in CheckServerVersionForStreaming().
520 : * There's no hope of recovering from a version mismatch, so don't
521 : * retry.
522 : */
523 0 : exit(1);
524 : }
525 :
526 : /*
527 : * Identify server, obtaining start LSN position and current timeline ID
528 : * at the same time, necessary if not valid data can be found in the
529 : * existing output directory.
530 : */
531 0 : if (!RunIdentifySystem(conn, &sysidentifier, &servertli, &serverpos, NULL))
532 0 : exit(1);
533 :
534 : /*
535 : * Figure out where to start streaming. First scan the local directory.
536 : */
537 0 : stream.startpos = FindStreamingStart(&stream.timeline);
538 0 : if (!XLogRecPtrIsValid(stream.startpos))
539 : {
540 : /*
541 : * Try to get the starting point from the slot if any. This is
542 : * supported in PostgreSQL 15 and newer.
543 : */
544 0 : if (replication_slot != NULL &&
545 0 : PQserverVersion(conn) >= 150000)
546 : {
547 0 : if (!GetSlotInformation(conn, replication_slot, &stream.startpos,
548 0 : &stream.timeline))
549 : {
550 : /* Error is logged by GetSlotInformation() */
551 0 : return;
552 : }
553 0 : }
554 :
555 : /*
556 : * If it the starting point is still not known, use the current WAL
557 : * flush value as last resort.
558 : */
559 0 : if (!XLogRecPtrIsValid(stream.startpos))
560 : {
561 0 : stream.startpos = serverpos;
562 0 : stream.timeline = servertli;
563 0 : }
564 0 : }
565 :
566 0 : Assert(XLogRecPtrIsValid(stream.startpos) &&
567 : stream.timeline != 0);
568 :
569 : /*
570 : * Always start streaming at the beginning of a segment
571 : */
572 0 : stream.startpos -= XLogSegmentOffset(stream.startpos, WalSegSz);
573 :
574 : /*
575 : * Start the replication
576 : */
577 0 : if (verbose)
578 0 : pg_log_info("starting log streaming at %X/%08X (timeline %u)",
579 : LSN_FORMAT_ARGS(stream.startpos),
580 : stream.timeline);
581 :
582 0 : stream.stream_stop = stop_streaming;
583 0 : stream.stop_socket = PGINVALID_SOCKET;
584 0 : stream.standby_message_timeout = standby_message_timeout;
585 0 : stream.synchronous = synchronous;
586 0 : stream.do_sync = do_sync;
587 0 : stream.mark_done = false;
588 0 : stream.walmethod = CreateWalDirectoryMethod(basedir,
589 0 : compression_algorithm,
590 0 : compresslevel,
591 0 : stream.do_sync);
592 0 : stream.partial_suffix = ".partial";
593 0 : stream.replication_slot = replication_slot;
594 0 : stream.sysidentifier = sysidentifier;
595 :
596 0 : ReceiveXlogStream(conn, &stream);
597 :
598 0 : if (!stream.walmethod->ops->finish(stream.walmethod))
599 : {
600 0 : pg_log_info("could not finish writing WAL files: %m");
601 0 : return;
602 : }
603 :
604 0 : PQfinish(conn);
605 0 : conn = NULL;
606 :
607 0 : stream.walmethod->ops->free(stream.walmethod);
608 0 : }
609 :
610 : /*
611 : * When SIGINT/SIGTERM are caught, just tell the system to exit at the next
612 : * possible moment.
613 : */
614 : #ifndef WIN32
615 :
616 : static void
617 0 : sigexit_handler(SIGNAL_ARGS)
618 : {
619 0 : time_to_stop = true;
620 0 : }
621 : #endif
622 :
623 : int
624 0 : main(int argc, char **argv)
625 : {
626 : static struct option long_options[] = {
627 : {"help", no_argument, NULL, '?'},
628 : {"version", no_argument, NULL, 'V'},
629 : {"directory", required_argument, NULL, 'D'},
630 : {"dbname", required_argument, NULL, 'd'},
631 : {"endpos", required_argument, NULL, 'E'},
632 : {"host", required_argument, NULL, 'h'},
633 : {"port", required_argument, NULL, 'p'},
634 : {"username", required_argument, NULL, 'U'},
635 : {"no-loop", no_argument, NULL, 'n'},
636 : {"no-password", no_argument, NULL, 'w'},
637 : {"password", no_argument, NULL, 'W'},
638 : {"status-interval", required_argument, NULL, 's'},
639 : {"slot", required_argument, NULL, 'S'},
640 : {"verbose", no_argument, NULL, 'v'},
641 : {"compress", required_argument, NULL, 'Z'},
642 : /* action */
643 : {"create-slot", no_argument, NULL, 1},
644 : {"drop-slot", no_argument, NULL, 2},
645 : {"if-not-exists", no_argument, NULL, 3},
646 : {"synchronous", no_argument, NULL, 4},
647 : {"no-sync", no_argument, NULL, 5},
648 : {NULL, 0, NULL, 0}
649 : };
650 :
651 0 : int c;
652 0 : int option_index;
653 0 : char *db_name;
654 0 : uint32 hi,
655 : lo;
656 0 : pg_compress_specification compression_spec;
657 0 : char *compression_detail = NULL;
658 0 : char *compression_algorithm_str = "none";
659 0 : char *error_detail = NULL;
660 :
661 0 : pg_logging_init(argv[0]);
662 0 : progname = get_progname(argv[0]);
663 0 : set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_basebackup"));
664 :
665 0 : if (argc > 1)
666 : {
667 0 : if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
668 : {
669 0 : usage();
670 0 : exit(0);
671 : }
672 0 : else if (strcmp(argv[1], "-V") == 0 ||
673 0 : strcmp(argv[1], "--version") == 0)
674 : {
675 0 : puts("pg_receivewal (PostgreSQL) " PG_VERSION);
676 0 : exit(0);
677 : }
678 0 : }
679 :
680 0 : while ((c = getopt_long(argc, argv, "d:D:E:h:np:s:S:U:vwWZ:",
681 0 : long_options, &option_index)) != -1)
682 : {
683 0 : switch (c)
684 : {
685 : case 'd':
686 0 : connection_string = pg_strdup(optarg);
687 0 : break;
688 : case 'D':
689 0 : basedir = pg_strdup(optarg);
690 0 : break;
691 : case 'E':
692 0 : if (sscanf(optarg, "%X/%08X", &hi, &lo) != 2)
693 0 : pg_fatal("could not parse end position \"%s\"", optarg);
694 0 : endpos = ((uint64) hi) << 32 | lo;
695 0 : break;
696 : case 'h':
697 0 : dbhost = pg_strdup(optarg);
698 0 : break;
699 : case 'n':
700 0 : noloop = true;
701 0 : break;
702 : case 'p':
703 0 : dbport = pg_strdup(optarg);
704 0 : break;
705 : case 's':
706 0 : if (!option_parse_int(optarg, "-s/--status-interval", 0,
707 : INT_MAX / 1000,
708 : &standby_message_timeout))
709 0 : exit(1);
710 0 : standby_message_timeout *= 1000;
711 0 : break;
712 : case 'S':
713 0 : replication_slot = pg_strdup(optarg);
714 0 : break;
715 : case 'U':
716 0 : dbuser = pg_strdup(optarg);
717 0 : break;
718 : case 'v':
719 0 : verbose++;
720 0 : break;
721 : case 'w':
722 0 : dbgetpassword = -1;
723 0 : break;
724 : case 'W':
725 0 : dbgetpassword = 1;
726 0 : break;
727 : case 'Z':
728 0 : parse_compress_options(optarg, &compression_algorithm_str,
729 : &compression_detail);
730 0 : break;
731 : case 1:
732 0 : do_create_slot = true;
733 0 : break;
734 : case 2:
735 0 : do_drop_slot = true;
736 0 : break;
737 : case 3:
738 0 : slot_exists_ok = true;
739 0 : break;
740 : case 4:
741 0 : synchronous = true;
742 0 : break;
743 : case 5:
744 0 : do_sync = false;
745 0 : break;
746 : default:
747 : /* getopt_long already emitted a complaint */
748 0 : pg_log_error_hint("Try \"%s --help\" for more information.", progname);
749 0 : exit(1);
750 : }
751 : }
752 :
753 : /*
754 : * Any non-option arguments?
755 : */
756 0 : if (optind < argc)
757 : {
758 0 : pg_log_error("too many command-line arguments (first is \"%s\")",
759 : argv[optind]);
760 0 : pg_log_error_hint("Try \"%s --help\" for more information.", progname);
761 0 : exit(1);
762 : }
763 :
764 0 : if (do_drop_slot && do_create_slot)
765 : {
766 0 : pg_log_error("cannot use --create-slot together with --drop-slot");
767 0 : pg_log_error_hint("Try \"%s --help\" for more information.", progname);
768 0 : exit(1);
769 : }
770 :
771 0 : if (replication_slot == NULL && (do_drop_slot || do_create_slot))
772 : {
773 : /* translator: second %s is an option name */
774 0 : pg_log_error("%s needs a slot to be specified using --slot",
775 : do_drop_slot ? "--drop-slot" : "--create-slot");
776 0 : pg_log_error_hint("Try \"%s --help\" for more information.", progname);
777 0 : exit(1);
778 : }
779 :
780 0 : if (synchronous && !do_sync)
781 : {
782 0 : pg_log_error("cannot use --synchronous together with --no-sync");
783 0 : pg_log_error_hint("Try \"%s --help\" for more information.", progname);
784 0 : exit(1);
785 : }
786 :
787 : /*
788 : * Required arguments
789 : */
790 0 : if (basedir == NULL && !do_drop_slot && !do_create_slot)
791 : {
792 0 : pg_log_error("no target directory specified");
793 0 : pg_log_error_hint("Try \"%s --help\" for more information.", progname);
794 0 : exit(1);
795 : }
796 :
797 : /*
798 : * Compression options
799 : */
800 0 : if (!parse_compress_algorithm(compression_algorithm_str,
801 : &compression_algorithm))
802 0 : pg_fatal("unrecognized compression algorithm: \"%s\"",
803 : compression_algorithm_str);
804 :
805 0 : parse_compress_specification(compression_algorithm, compression_detail,
806 : &compression_spec);
807 0 : error_detail = validate_compress_specification(&compression_spec);
808 0 : if (error_detail != NULL)
809 0 : pg_fatal("invalid compression specification: %s",
810 : error_detail);
811 :
812 : /* Extract the compression level */
813 0 : compresslevel = compression_spec.level;
814 :
815 0 : if (compression_algorithm == PG_COMPRESSION_ZSTD)
816 0 : pg_fatal("compression with %s is not yet supported", "ZSTD");
817 :
818 : /*
819 : * Check existence of destination folder.
820 : */
821 0 : if (!do_drop_slot && !do_create_slot)
822 : {
823 0 : DIR *dir = get_destination_dir(basedir);
824 :
825 0 : close_destination_dir(dir, basedir);
826 0 : }
827 :
828 : /*
829 : * Obtain a connection before doing anything.
830 : */
831 0 : conn = GetConnection();
832 0 : if (!conn)
833 : /* error message already written in GetConnection() */
834 0 : exit(1);
835 0 : atexit(disconnect_atexit);
836 :
837 : /*
838 : * Trap signals. (Don't do this until after the initial password prompt,
839 : * if one is needed, in GetConnection.)
840 : */
841 : #ifndef WIN32
842 0 : pqsignal(SIGINT, sigexit_handler);
843 0 : pqsignal(SIGTERM, sigexit_handler);
844 : #endif
845 :
846 : /*
847 : * Run IDENTIFY_SYSTEM to make sure we've successfully have established a
848 : * replication connection and haven't connected using a database specific
849 : * connection.
850 : */
851 0 : if (!RunIdentifySystem(conn, NULL, NULL, NULL, &db_name))
852 0 : exit(1);
853 :
854 : /*
855 : * Check that there is a database associated with connection, none should
856 : * be defined in this context.
857 : */
858 0 : if (db_name)
859 0 : pg_fatal("replication connection using slot \"%s\" is unexpectedly database specific",
860 : replication_slot);
861 :
862 : /*
863 : * Set umask so that directories/files are created with the same
864 : * permissions as directories/files in the source data directory.
865 : *
866 : * pg_mode_mask is set to owner-only by default and then updated in
867 : * GetConnection() where we get the mode from the server-side with
868 : * RetrieveDataDirCreatePerm() and then call SetDataDirectoryCreatePerm().
869 : */
870 0 : umask(pg_mode_mask);
871 :
872 : /*
873 : * Drop a replication slot.
874 : */
875 0 : if (do_drop_slot)
876 : {
877 0 : if (verbose)
878 0 : pg_log_info("dropping replication slot \"%s\"", replication_slot);
879 :
880 0 : if (!DropReplicationSlot(conn, replication_slot))
881 0 : exit(1);
882 0 : exit(0);
883 : }
884 :
885 : /* Create a replication slot */
886 0 : if (do_create_slot)
887 : {
888 0 : if (verbose)
889 0 : pg_log_info("creating replication slot \"%s\"", replication_slot);
890 :
891 0 : if (!CreateReplicationSlot(conn, replication_slot, NULL, false, true, false,
892 0 : slot_exists_ok, false, false))
893 0 : exit(1);
894 0 : exit(0);
895 : }
896 :
897 : /* determine remote server's xlog segment size */
898 0 : if (!RetrieveWalSegSize(conn))
899 0 : exit(1);
900 :
901 : /*
902 : * Don't close the connection here so that subsequent StreamLog() can
903 : * reuse it.
904 : */
905 :
906 0 : while (true)
907 : {
908 0 : StreamLog();
909 0 : if (time_to_stop)
910 : {
911 : /*
912 : * We've been Ctrl-C'ed or end of streaming position has been
913 : * willingly reached, so exit without an error code.
914 : */
915 0 : exit(0);
916 : }
917 0 : else if (noloop)
918 0 : pg_fatal("disconnected");
919 : else
920 : {
921 : /* translator: check source for value for %d */
922 0 : pg_log_info("disconnected; waiting %d seconds to try again",
923 : RECONNECT_SLEEP_TIME);
924 0 : pg_usleep(RECONNECT_SLEEP_TIME * 1000000);
925 : }
926 : }
927 : }
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