1: /*
2: * Socket and pipe I/O utilities used in rsync.
3: *
4: * Copyright (C) 1996-2001 Andrew Tridgell
5: * Copyright (C) 1996 Paul Mackerras
6: * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
7: * Copyright (C) 2003-2015 Wayne Davison
8: *
9: * This program is free software; you can redistribute it and/or modify
10: * it under the terms of the GNU General Public License as published by
11: * the Free Software Foundation; either version 3 of the License, or
12: * (at your option) any later version.
13: *
14: * This program is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: * GNU General Public License for more details.
18: *
19: * You should have received a copy of the GNU General Public License along
20: * with this program; if not, visit the http://fsf.org website.
21: */
22:
23: /* Rsync provides its own multiplexing system, which is used to send
24: * stderr and stdout over a single socket.
25: *
26: * For historical reasons this is off during the start of the
27: * connection, but it's switched on quite early using
28: * io_start_multiplex_out() and io_start_multiplex_in(). */
29:
30: #include "rsync.h"
31: #include "ifuncs.h"
32: #include "inums.h"
33:
34: /** If no timeout is specified then use a 60 second select timeout */
35: #define SELECT_TIMEOUT 60
36:
37: extern int bwlimit;
38: extern size_t bwlimit_writemax;
39: extern int io_timeout;
40: extern int am_server;
41: extern int am_sender;
42: extern int am_receiver;
43: extern int am_generator;
44: extern int msgs2stderr;
45: extern int inc_recurse;
46: extern int io_error;
47: extern int eol_nulls;
48: extern int flist_eof;
49: extern int file_total;
50: extern int file_old_total;
51: extern int list_only;
52: extern int read_batch;
53: extern int compat_flags;
54: extern int protect_args;
55: extern int checksum_seed;
56: extern int protocol_version;
57: extern int remove_source_files;
58: extern int preserve_hard_links;
59: extern BOOL extra_flist_sending_enabled;
60: extern BOOL flush_ok_after_signal;
61: extern struct stats stats;
62: extern struct file_list *cur_flist;
63: #ifdef ICONV_OPTION
64: extern int filesfrom_convert;
65: extern iconv_t ic_send, ic_recv;
66: #endif
67:
68: int csum_length = SHORT_SUM_LENGTH; /* initial value */
69: int allowed_lull = 0;
70: int batch_fd = -1;
71: int msgdone_cnt = 0;
72: int forward_flist_data = 0;
73: BOOL flist_receiving_enabled = False;
74:
75: /* Ignore an EOF error if non-zero. See whine_about_eof(). */
76: int kluge_around_eof = 0;
77: int got_kill_signal = -1; /* is set to 0 only after multiplexed I/O starts */
78:
79: int sock_f_in = -1;
80: int sock_f_out = -1;
81:
82: int64 total_data_read = 0;
83: int64 total_data_written = 0;
84:
85: static struct {
86: xbuf in, out, msg;
87: int in_fd;
88: int out_fd; /* Both "out" and "msg" go to this fd. */
89: int in_multiplexed;
90: unsigned out_empty_len;
91: size_t raw_data_header_pos; /* in the out xbuf */
92: size_t raw_flushing_ends_before; /* in the out xbuf */
93: size_t raw_input_ends_before; /* in the in xbuf */
94: } iobuf = { .in_fd = -1, .out_fd = -1 };
95:
96: static time_t last_io_in;
97: static time_t last_io_out;
98:
99: static int write_batch_monitor_in = -1;
100: static int write_batch_monitor_out = -1;
101:
102: static int ff_forward_fd = -1;
103: static int ff_reenable_multiplex = -1;
104: static char ff_lastchar = '\0';
105: static xbuf ff_xb = EMPTY_XBUF;
106: #ifdef ICONV_OPTION
107: static xbuf iconv_buf = EMPTY_XBUF;
108: #endif
109: static int select_timeout = SELECT_TIMEOUT;
110: static int active_filecnt = 0;
111: static OFF_T active_bytecnt = 0;
112: static int first_message = 1;
113:
114: static char int_byte_extra[64] = {
115: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (00 - 3F)/4 */
116: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (40 - 7F)/4 */
117: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* (80 - BF)/4 */
118: 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6, /* (C0 - FF)/4 */
119: };
120:
121: /* Our I/O buffers are sized with no bits on in the lowest byte of the "size"
122: * (indeed, our rounding of sizes in 1024-byte units assures more than this).
123: * This allows the code that is storing bytes near the physical end of a
124: * circular buffer to temporarily reduce the buffer's size (in order to make
125: * some storing idioms easier), while also making it simple to restore the
126: * buffer's actual size when the buffer's "pos" wraps around to the start (we
127: * just round the buffer's size up again). */
128:
129: #define IOBUF_WAS_REDUCED(siz) ((siz) & 0xFF)
130: #define IOBUF_RESTORE_SIZE(siz) (((siz) | 0xFF) + 1)
131:
132: #define IN_MULTIPLEXED (iobuf.in_multiplexed != 0)
133: #define IN_MULTIPLEXED_AND_READY (iobuf.in_multiplexed > 0)
134: #define OUT_MULTIPLEXED (iobuf.out_empty_len != 0)
135:
136: #define PIO_NEED_INPUT (1<<0) /* The *_NEED_* flags are mutually exclusive. */
137: #define PIO_NEED_OUTROOM (1<<1)
138: #define PIO_NEED_MSGROOM (1<<2)
139:
140: #define PIO_CONSUME_INPUT (1<<4) /* Must becombined with PIO_NEED_INPUT. */
141:
142: #define PIO_INPUT_AND_CONSUME (PIO_NEED_INPUT | PIO_CONSUME_INPUT)
143: #define PIO_NEED_FLAGS (PIO_NEED_INPUT | PIO_NEED_OUTROOM | PIO_NEED_MSGROOM)
144:
145: #define REMOTE_OPTION_ERROR "rsync: on remote machine: -"
146: #define REMOTE_OPTION_ERROR2 ": unknown option"
147:
148: #define FILESFROM_BUFLEN 2048
149:
150: enum festatus { FES_SUCCESS, FES_REDO, FES_NO_SEND };
151:
152: static flist_ndx_list redo_list, hlink_list;
153:
154: static void read_a_msg(void);
155: static void drain_multiplex_messages(void);
156: static void sleep_for_bwlimit(int bytes_written);
157:
158: static void check_timeout(BOOL allow_keepalive, int keepalive_flags)
159: {
160: time_t t, chk;
161:
162: /* On the receiving side, the generator is now the one that decides
163: * when a timeout has occurred. When it is sifting through a lot of
164: * files looking for work, it will be sending keep-alive messages to
165: * the sender, and even though the receiver won't be sending/receiving
166: * anything (not even keep-alive messages), the successful writes to
167: * the sender will keep things going. If the receiver is actively
168: * receiving data, it will ensure that the generator knows that it is
169: * not idle by sending the generator keep-alive messages (since the
170: * generator might be blocked trying to send checksums, it needs to
171: * know that the receiver is active). Thus, as long as one or the
172: * other is successfully doing work, the generator will not timeout. */
173: if (!io_timeout)
174: return;
175:
176: t = time(NULL);
177:
178: if (allow_keepalive) {
179: /* This may put data into iobuf.msg w/o flushing. */
180: maybe_send_keepalive(t, keepalive_flags);
181: }
182:
183: if (!last_io_in)
184: last_io_in = t;
185:
186: if (am_receiver)
187: return;
188:
189: chk = MAX(last_io_out, last_io_in);
190: if (t - chk >= io_timeout) {
191: if (am_server)
192: msgs2stderr = 1;
193: rprintf(FERROR, "[%s] io timeout after %d seconds -- exiting\n",
194: who_am_i(), (int)(t-chk));
195: exit_cleanup(RERR_TIMEOUT);
196: }
197: }
198:
199: /* It's almost always an error to get an EOF when we're trying to read from the
200: * network, because the protocol is (for the most part) self-terminating.
201: *
202: * There is one case for the receiver when it is at the end of the transfer
203: * (hanging around reading any keep-alive packets that might come its way): if
204: * the sender dies before the generator's kill-signal comes through, we can end
205: * up here needing to loop until the kill-signal arrives. In this situation,
206: * kluge_around_eof will be < 0.
207: *
208: * There is another case for older protocol versions (< 24) where the module
209: * listing was not terminated, so we must ignore an EOF error in that case and
210: * exit. In this situation, kluge_around_eof will be > 0. */
211: static NORETURN void whine_about_eof(BOOL allow_kluge)
212: {
213: if (kluge_around_eof && allow_kluge) {
214: int i;
215: if (kluge_around_eof > 0)
216: exit_cleanup(0);
217: /* If we're still here after 10 seconds, exit with an error. */
218: for (i = 10*1000/20; i--; )
219: msleep(20);
220: }
221:
222: rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed "
223: "(%s bytes received so far) [%s]\n",
224: big_num(stats.total_read), who_am_i());
225:
226: exit_cleanup(RERR_STREAMIO);
227: }
228:
229: /* Do a safe read, handling any needed looping and error handling.
230: * Returns the count of the bytes read, which will only be different
231: * from "len" if we encountered an EOF. This routine is not used on
232: * the socket except very early in the transfer. */
233: static size_t safe_read(int fd, char *buf, size_t len)
234: {
235: size_t got = 0;
236:
237: assert(fd != iobuf.in_fd);
238:
239: while (1) {
240: struct timeval tv;
241: fd_set r_fds, e_fds;
242: int cnt;
243:
244: FD_ZERO(&r_fds);
245: FD_SET(fd, &r_fds);
246: FD_ZERO(&e_fds);
247: FD_SET(fd, &e_fds);
248: tv.tv_sec = select_timeout;
249: tv.tv_usec = 0;
250:
251: cnt = select(fd+1, &r_fds, NULL, &e_fds, &tv);
252: if (cnt <= 0) {
253: if (cnt < 0 && errno == EBADF) {
254: rsyserr(FERROR, errno, "safe_read select failed [%s]",
255: who_am_i());
256: exit_cleanup(RERR_FILEIO);
257: }
258: check_timeout(1, MSK_ALLOW_FLUSH);
259: continue;
260: }
261:
262: /*if (FD_ISSET(fd, &e_fds))
263: rprintf(FINFO, "select exception on fd %d\n", fd); */
264:
265: if (FD_ISSET(fd, &r_fds)) {
266: int n = read(fd, buf + got, len - got);
267: if (DEBUG_GTE(IO, 2))
268: rprintf(FINFO, "[%s] safe_read(%d)=%ld\n", who_am_i(), fd, (long)n);
269: if (n == 0)
270: break;
271: if (n < 0) {
272: if (errno == EINTR)
273: continue;
274: rsyserr(FERROR, errno, "safe_read failed to read %ld bytes [%s]",
275: (long)len, who_am_i());
276: exit_cleanup(RERR_STREAMIO);
277: }
278: if ((got += (size_t)n) == len)
279: break;
280: }
281: }
282:
283: return got;
284: }
285:
286: static const char *what_fd_is(int fd)
287: {
288: static char buf[20];
289:
290: if (fd == sock_f_out)
291: return "socket";
292: else if (fd == iobuf.out_fd)
293: return "message fd";
294: else if (fd == batch_fd)
295: return "batch file";
296: else {
297: snprintf(buf, sizeof buf, "fd %d", fd);
298: return buf;
299: }
300: }
301:
302: /* Do a safe write, handling any needed looping and error handling.
303: * Returns only if everything was successfully written. This routine
304: * is not used on the socket except very early in the transfer. */
305: static void safe_write(int fd, const char *buf, size_t len)
306: {
307: int n;
308:
309: assert(fd != iobuf.out_fd);
310:
311: n = write(fd, buf, len);
312: if ((size_t)n == len)
313: return;
314: if (n < 0) {
315: if (errno != EINTR && errno != EWOULDBLOCK && errno != EAGAIN) {
316: write_failed:
317: rsyserr(FERROR, errno,
318: "safe_write failed to write %ld bytes to %s [%s]",
319: (long)len, what_fd_is(fd), who_am_i());
320: exit_cleanup(RERR_STREAMIO);
321: }
322: } else {
323: buf += n;
324: len -= n;
325: }
326:
327: while (len) {
328: struct timeval tv;
329: fd_set w_fds;
330: int cnt;
331:
332: FD_ZERO(&w_fds);
333: FD_SET(fd, &w_fds);
334: tv.tv_sec = select_timeout;
335: tv.tv_usec = 0;
336:
337: cnt = select(fd + 1, NULL, &w_fds, NULL, &tv);
338: if (cnt <= 0) {
339: if (cnt < 0 && errno == EBADF) {
340: rsyserr(FERROR, errno, "safe_write select failed on %s [%s]",
341: what_fd_is(fd), who_am_i());
342: exit_cleanup(RERR_FILEIO);
343: }
344: if (io_timeout)
345: maybe_send_keepalive(time(NULL), MSK_ALLOW_FLUSH);
346: continue;
347: }
348:
349: if (FD_ISSET(fd, &w_fds)) {
350: n = write(fd, buf, len);
351: if (n < 0) {
352: if (errno == EINTR)
353: continue;
354: goto write_failed;
355: }
356: buf += n;
357: len -= n;
358: }
359: }
360: }
361:
362: /* This is only called when files-from data is known to be available. We read
363: * a chunk of data and put it into the output buffer. */
364: static void forward_filesfrom_data(void)
365: {
366: int len;
367:
368: len = read(ff_forward_fd, ff_xb.buf + ff_xb.len, ff_xb.size - ff_xb.len);
369: if (len <= 0) {
370: if (len == 0 || errno != EINTR) {
371: /* Send end-of-file marker */
372: ff_forward_fd = -1;
373: write_buf(iobuf.out_fd, "\0\0", ff_lastchar ? 2 : 1);
374: free_xbuf(&ff_xb);
375: if (ff_reenable_multiplex >= 0)
376: io_start_multiplex_out(ff_reenable_multiplex);
377: }
378: return;
379: }
380:
381: if (DEBUG_GTE(IO, 2))
382: rprintf(FINFO, "[%s] files-from read=%ld\n", who_am_i(), (long)len);
383:
384: #ifdef ICONV_OPTION
385: len += ff_xb.len;
386: #endif
387:
388: if (!eol_nulls) {
389: char *s = ff_xb.buf + len;
390: /* Transform CR and/or LF into '\0' */
391: while (s-- > ff_xb.buf) {
392: if (*s == '\n' || *s == '\r')
393: *s = '\0';
394: }
395: }
396:
397: if (ff_lastchar)
398: ff_xb.pos = 0;
399: else {
400: char *s = ff_xb.buf;
401: /* Last buf ended with a '\0', so don't let this buf start with one. */
402: while (len && *s == '\0')
403: s++, len--;
404: ff_xb.pos = s - ff_xb.buf;
405: }
406:
407: #ifdef ICONV_OPTION
408: if (filesfrom_convert && len) {
409: char *sob = ff_xb.buf + ff_xb.pos, *s = sob;
410: char *eob = sob + len;
411: int flags = ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_CIRCULAR_OUT;
412: if (ff_lastchar == '\0')
413: flags |= ICB_INIT;
414: /* Convert/send each null-terminated string separately, skipping empties. */
415: while (s != eob) {
416: if (*s++ == '\0') {
417: ff_xb.len = s - sob - 1;
418: if (iconvbufs(ic_send, &ff_xb, &iobuf.out, flags) < 0)
419: exit_cleanup(RERR_PROTOCOL); /* impossible? */
420: write_buf(iobuf.out_fd, s-1, 1); /* Send the '\0'. */
421: while (s != eob && *s == '\0')
422: s++;
423: sob = s;
424: ff_xb.pos = sob - ff_xb.buf;
425: flags |= ICB_INIT;
426: }
427: }
428:
429: if ((ff_xb.len = s - sob) == 0)
430: ff_lastchar = '\0';
431: else {
432: /* Handle a partial string specially, saving any incomplete chars. */
433: flags &= ~ICB_INCLUDE_INCOMPLETE;
434: if (iconvbufs(ic_send, &ff_xb, &iobuf.out, flags) < 0) {
435: if (errno == E2BIG)
436: exit_cleanup(RERR_PROTOCOL); /* impossible? */
437: if (ff_xb.pos)
438: memmove(ff_xb.buf, ff_xb.buf + ff_xb.pos, ff_xb.len);
439: }
440: ff_lastchar = 'x'; /* Anything non-zero. */
441: }
442: } else
443: #endif
444:
445: if (len) {
446: char *f = ff_xb.buf + ff_xb.pos;
447: char *t = ff_xb.buf;
448: char *eob = f + len;
449: /* Eliminate any multi-'\0' runs. */
450: while (f != eob) {
451: if (!(*t++ = *f++)) {
452: while (f != eob && *f == '\0')
453: f++;
454: }
455: }
456: ff_lastchar = f[-1];
457: if ((len = t - ff_xb.buf) != 0) {
458: /* This will not circle back to perform_io() because we only get
459: * called when there is plenty of room in the output buffer. */
460: write_buf(iobuf.out_fd, ff_xb.buf, len);
461: }
462: }
463: }
464:
465: void reduce_iobuf_size(xbuf *out, size_t new_size)
466: {
467: if (new_size < out->size) {
468: /* Avoid weird buffer interactions by only outputting this to stderr. */
469: if (msgs2stderr && DEBUG_GTE(IO, 4)) {
470: const char *name = out == &iobuf.out ? "iobuf.out"
471: : out == &iobuf.msg ? "iobuf.msg"
472: : NULL;
473: if (name) {
474: rprintf(FINFO, "[%s] reduced size of %s (-%d)\n",
475: who_am_i(), name, (int)(out->size - new_size));
476: }
477: }
478: out->size = new_size;
479: }
480: }
481:
482: void restore_iobuf_size(xbuf *out)
483: {
484: if (IOBUF_WAS_REDUCED(out->size)) {
485: size_t new_size = IOBUF_RESTORE_SIZE(out->size);
486: /* Avoid weird buffer interactions by only outputting this to stderr. */
487: if (msgs2stderr && DEBUG_GTE(IO, 4)) {
488: const char *name = out == &iobuf.out ? "iobuf.out"
489: : out == &iobuf.msg ? "iobuf.msg"
490: : NULL;
491: if (name) {
492: rprintf(FINFO, "[%s] restored size of %s (+%d)\n",
493: who_am_i(), name, (int)(new_size - out->size));
494: }
495: }
496: out->size = new_size;
497: }
498: }
499:
500: static void handle_kill_signal(BOOL flush_ok)
501: {
502: got_kill_signal = -1;
503: flush_ok_after_signal = flush_ok;
504: exit_cleanup(RERR_SIGNAL);
505: }
506:
507: /* Perform buffered input and/or output until specified conditions are met.
508: * When given a "needed" read or write request, this returns without doing any
509: * I/O if the needed input bytes or write space is already available. Once I/O
510: * is needed, this will try to do whatever reading and/or writing is currently
511: * possible, up to the maximum buffer allowances, no matter if this is a read
512: * or write request. However, the I/O stops as soon as the required input
513: * bytes or output space is available. If this is not a read request, the
514: * routine may also do some advantageous reading of messages from a multiplexed
515: * input source (which ensures that we don't jam up with everyone in their
516: * "need to write" code and nobody reading the accumulated data that would make
517: * writing possible).
518: *
519: * The iobuf.in, .out and .msg buffers are all circular. Callers need to be
520: * aware that some data copies will need to be split when the bytes wrap around
521: * from the end to the start. In order to help make writing into the output
522: * buffers easier for some operations (such as the use of SIVAL() into the
523: * buffer) a buffer may be temporarily shortened by a small amount, but the
524: * original size will be automatically restored when the .pos wraps to the
525: * start. See also the 3 raw_* iobuf vars that are used in the handling of
526: * MSG_DATA bytes as they are read-from/written-into the buffers.
527: *
528: * When writing, we flush data in the following priority order:
529: *
530: * 1. Finish writing any in-progress MSG_DATA sequence from iobuf.out.
531: *
532: * 2. Write out all the messages from the message buf (if iobuf.msg is active).
533: * Yes, this means that a PIO_NEED_OUTROOM call will completely flush any
534: * messages before getting to the iobuf.out flushing (except for rule 1).
535: *
536: * 3. Write out the raw data from iobuf.out, possibly filling in the multiplexed
537: * MSG_DATA header that was pre-allocated (when output is multiplexed).
538: *
539: * TODO: items for possible future work:
540: *
541: * - Make this routine able to read the generator-to-receiver batch flow?
542: *
543: * Unlike the old routines that this replaces, it is OK to read ahead as far as
544: * we can because the read_a_msg() routine now reads its bytes out of the input
545: * buffer. In the old days, only raw data was in the input buffer, and any
546: * unused raw data in the buf would prevent the reading of socket data. */
547: static char *perform_io(size_t needed, int flags)
548: {
549: fd_set r_fds, e_fds, w_fds;
550: struct timeval tv;
551: int cnt, max_fd;
552: size_t empty_buf_len = 0;
553: xbuf *out;
554: char *data;
555:
556: if (iobuf.in.len == 0 && iobuf.in.pos != 0) {
557: if (iobuf.raw_input_ends_before)
558: iobuf.raw_input_ends_before -= iobuf.in.pos;
559: iobuf.in.pos = 0;
560: }
561:
562: switch (flags & PIO_NEED_FLAGS) {
563: case PIO_NEED_INPUT:
564: /* We never resize the circular input buffer. */
565: if (iobuf.in.size < needed) {
566: rprintf(FERROR, "need to read %ld bytes, iobuf.in.buf is only %ld bytes.\n",
567: (long)needed, (long)iobuf.in.size);
568: exit_cleanup(RERR_PROTOCOL);
569: }
570:
571: if (msgs2stderr && DEBUG_GTE(IO, 3)) {
572: rprintf(FINFO, "[%s] perform_io(%ld, %sinput)\n",
573: who_am_i(), (long)needed, flags & PIO_CONSUME_INPUT ? "consume&" : "");
574: }
575: break;
576:
577: case PIO_NEED_OUTROOM:
578: /* We never resize the circular output buffer. */
579: if (iobuf.out.size - iobuf.out_empty_len < needed) {
580: fprintf(stderr, "need to write %ld bytes, iobuf.out.buf is only %ld bytes.\n",
581: (long)needed, (long)(iobuf.out.size - iobuf.out_empty_len));
582: exit_cleanup(RERR_PROTOCOL);
583: }
584:
585: if (msgs2stderr && DEBUG_GTE(IO, 3)) {
586: rprintf(FINFO, "[%s] perform_io(%ld, outroom) needs to flush %ld\n",
587: who_am_i(), (long)needed,
588: iobuf.out.len + needed > iobuf.out.size
589: ? (long)(iobuf.out.len + needed - iobuf.out.size) : 0L);
590: }
591: break;
592:
593: case PIO_NEED_MSGROOM:
594: /* We never resize the circular message buffer. */
595: if (iobuf.msg.size < needed) {
596: fprintf(stderr, "need to write %ld bytes, iobuf.msg.buf is only %ld bytes.\n",
597: (long)needed, (long)iobuf.msg.size);
598: exit_cleanup(RERR_PROTOCOL);
599: }
600:
601: if (msgs2stderr && DEBUG_GTE(IO, 3)) {
602: rprintf(FINFO, "[%s] perform_io(%ld, msgroom) needs to flush %ld\n",
603: who_am_i(), (long)needed,
604: iobuf.msg.len + needed > iobuf.msg.size
605: ? (long)(iobuf.msg.len + needed - iobuf.msg.size) : 0L);
606: }
607: break;
608:
609: case 0:
610: if (msgs2stderr && DEBUG_GTE(IO, 3))
611: rprintf(FINFO, "[%s] perform_io(%ld, %d)\n", who_am_i(), (long)needed, flags);
612: break;
613:
614: default:
615: exit_cleanup(RERR_UNSUPPORTED);
616: }
617:
618: while (1) {
619: switch (flags & PIO_NEED_FLAGS) {
620: case PIO_NEED_INPUT:
621: if (iobuf.in.len >= needed)
622: goto double_break;
623: break;
624: case PIO_NEED_OUTROOM:
625: /* Note that iobuf.out_empty_len doesn't factor into this check
626: * because iobuf.out.len already holds any needed header len. */
627: if (iobuf.out.len + needed <= iobuf.out.size)
628: goto double_break;
629: break;
630: case PIO_NEED_MSGROOM:
631: if (iobuf.msg.len + needed <= iobuf.msg.size)
632: goto double_break;
633: break;
634: }
635:
636: max_fd = -1;
637:
638: FD_ZERO(&r_fds);
639: FD_ZERO(&e_fds);
640: if (iobuf.in_fd >= 0 && iobuf.in.size - iobuf.in.len) {
641: if (!read_batch || batch_fd >= 0) {
642: FD_SET(iobuf.in_fd, &r_fds);
643: FD_SET(iobuf.in_fd, &e_fds);
644: }
645: if (iobuf.in_fd > max_fd)
646: max_fd = iobuf.in_fd;
647: }
648:
649: /* Only do more filesfrom processing if there is enough room in the out buffer. */
650: if (ff_forward_fd >= 0 && iobuf.out.size - iobuf.out.len > FILESFROM_BUFLEN*2) {
651: FD_SET(ff_forward_fd, &r_fds);
652: if (ff_forward_fd > max_fd)
653: max_fd = ff_forward_fd;
654: }
655:
656: FD_ZERO(&w_fds);
657: if (iobuf.out_fd >= 0) {
658: if (iobuf.raw_flushing_ends_before
659: || (!iobuf.msg.len && iobuf.out.len > iobuf.out_empty_len && !(flags & PIO_NEED_MSGROOM))) {
660: if (OUT_MULTIPLEXED && !iobuf.raw_flushing_ends_before) {
661: /* The iobuf.raw_flushing_ends_before value can point off the end
662: * of the iobuf.out buffer for a while, for easier subtracting. */
663: iobuf.raw_flushing_ends_before = iobuf.out.pos + iobuf.out.len;
664:
665: SIVAL(iobuf.out.buf + iobuf.raw_data_header_pos, 0,
666: ((MPLEX_BASE + (int)MSG_DATA)<<24) + iobuf.out.len - 4);
667:
668: if (msgs2stderr && DEBUG_GTE(IO, 1)) {
669: rprintf(FINFO, "[%s] send_msg(%d, %ld)\n",
670: who_am_i(), (int)MSG_DATA, (long)iobuf.out.len - 4);
671: }
672:
673: /* reserve room for the next MSG_DATA header */
674: iobuf.raw_data_header_pos = iobuf.raw_flushing_ends_before;
675: if (iobuf.raw_data_header_pos >= iobuf.out.size)
676: iobuf.raw_data_header_pos -= iobuf.out.size;
677: else if (iobuf.raw_data_header_pos + 4 > iobuf.out.size) {
678: /* The 4-byte header won't fit at the end of the buffer,
679: * so we'll temporarily reduce the output buffer's size
680: * and put the header at the start of the buffer. */
681: reduce_iobuf_size(&iobuf.out, iobuf.raw_data_header_pos);
682: iobuf.raw_data_header_pos = 0;
683: }
684: /* Yes, it is possible for this to make len > size for a while. */
685: iobuf.out.len += 4;
686: }
687:
688: empty_buf_len = iobuf.out_empty_len;
689: out = &iobuf.out;
690: } else if (iobuf.msg.len) {
691: empty_buf_len = 0;
692: out = &iobuf.msg;
693: } else
694: out = NULL;
695: if (out) {
696: FD_SET(iobuf.out_fd, &w_fds);
697: if (iobuf.out_fd > max_fd)
698: max_fd = iobuf.out_fd;
699: }
700: } else
701: out = NULL;
702:
703: if (max_fd < 0) {
704: switch (flags & PIO_NEED_FLAGS) {
705: case PIO_NEED_INPUT:
706: iobuf.in.len = 0;
707: if (kluge_around_eof == 2)
708: exit_cleanup(0);
709: if (iobuf.in_fd == -2)
710: whine_about_eof(True);
711: rprintf(FERROR, "error in perform_io: no fd for input.\n");
712: exit_cleanup(RERR_PROTOCOL);
713: case PIO_NEED_OUTROOM:
714: case PIO_NEED_MSGROOM:
715: msgs2stderr = 1;
716: drain_multiplex_messages();
717: if (iobuf.out_fd == -2)
718: whine_about_eof(True);
719: rprintf(FERROR, "error in perform_io: no fd for output.\n");
720: exit_cleanup(RERR_PROTOCOL);
721: default:
722: /* No stated needs, so I guess this is OK. */
723: break;
724: }
725: break;
726: }
727:
728: if (got_kill_signal > 0)
729: handle_kill_signal(True);
730:
731: if (extra_flist_sending_enabled) {
732: if (file_total - file_old_total < MAX_FILECNT_LOOKAHEAD && IN_MULTIPLEXED_AND_READY)
733: tv.tv_sec = 0;
734: else {
735: extra_flist_sending_enabled = False;
736: tv.tv_sec = select_timeout;
737: }
738: } else
739: tv.tv_sec = select_timeout;
740: tv.tv_usec = 0;
741:
742: cnt = select(max_fd + 1, &r_fds, &w_fds, &e_fds, &tv);
743:
744: if (cnt <= 0) {
745: if (cnt < 0 && errno == EBADF) {
746: msgs2stderr = 1;
747: exit_cleanup(RERR_SOCKETIO);
748: }
749: if (extra_flist_sending_enabled) {
750: extra_flist_sending_enabled = False;
751: send_extra_file_list(sock_f_out, -1);
752: extra_flist_sending_enabled = !flist_eof;
753: } else
754: check_timeout((flags & PIO_NEED_INPUT) != 0, 0);
755: FD_ZERO(&r_fds); /* Just in case... */
756: FD_ZERO(&w_fds);
757: }
758:
759: if (iobuf.in_fd >= 0 && FD_ISSET(iobuf.in_fd, &r_fds)) {
760: size_t len, pos = iobuf.in.pos + iobuf.in.len;
761: int n;
762: if (pos >= iobuf.in.size) {
763: pos -= iobuf.in.size;
764: len = iobuf.in.size - iobuf.in.len;
765: } else
766: len = iobuf.in.size - pos;
767: if ((n = read(iobuf.in_fd, iobuf.in.buf + pos, len)) <= 0) {
768: if (n == 0) {
769: /* Signal that input has become invalid. */
770: if (!read_batch || batch_fd < 0 || am_generator)
771: iobuf.in_fd = -2;
772: batch_fd = -1;
773: continue;
774: }
775: if (errno == EINTR || errno == EWOULDBLOCK || errno == EAGAIN)
776: n = 0;
777: else {
778: /* Don't write errors on a dead socket. */
779: if (iobuf.in_fd == sock_f_in) {
780: if (am_sender)
781: msgs2stderr = 1;
782: rsyserr(FERROR_SOCKET, errno, "read error");
783: } else
784: rsyserr(FERROR, errno, "read error");
785: exit_cleanup(RERR_SOCKETIO);
786: }
787: }
788: if (msgs2stderr && DEBUG_GTE(IO, 2))
789: rprintf(FINFO, "[%s] recv=%ld\n", who_am_i(), (long)n);
790:
791: if (io_timeout) {
792: last_io_in = time(NULL);
793: if (flags & PIO_NEED_INPUT)
794: maybe_send_keepalive(last_io_in, 0);
795: }
796: stats.total_read += n;
797:
798: iobuf.in.len += n;
799: }
800:
801: if (out && FD_ISSET(iobuf.out_fd, &w_fds)) {
802: size_t len = iobuf.raw_flushing_ends_before ? iobuf.raw_flushing_ends_before - out->pos : out->len;
803: int n;
804:
805: if (bwlimit_writemax && len > bwlimit_writemax)
806: len = bwlimit_writemax;
807:
808: if (out->pos + len > out->size)
809: len = out->size - out->pos;
810: if ((n = write(iobuf.out_fd, out->buf + out->pos, len)) <= 0) {
811: if (errno == EINTR || errno == EWOULDBLOCK || errno == EAGAIN)
812: n = 0;
813: else {
814: /* Don't write errors on a dead socket. */
815: msgs2stderr = 1;
816: iobuf.out_fd = -2;
817: iobuf.out.len = iobuf.msg.len = iobuf.raw_flushing_ends_before = 0;
818: rsyserr(FERROR_SOCKET, errno, "[%s] write error", who_am_i());
819: drain_multiplex_messages();
820: exit_cleanup(RERR_SOCKETIO);
821: }
822: }
823: if (msgs2stderr && DEBUG_GTE(IO, 2)) {
824: rprintf(FINFO, "[%s] %s sent=%ld\n",
825: who_am_i(), out == &iobuf.out ? "out" : "msg", (long)n);
826: }
827:
828: if (io_timeout)
829: last_io_out = time(NULL);
830: stats.total_written += n;
831:
832: if (bwlimit_writemax)
833: sleep_for_bwlimit(n);
834:
835: if ((out->pos += n) == out->size) {
836: if (iobuf.raw_flushing_ends_before)
837: iobuf.raw_flushing_ends_before -= out->size;
838: out->pos = 0;
839: restore_iobuf_size(out);
840: } else if (out->pos == iobuf.raw_flushing_ends_before)
841: iobuf.raw_flushing_ends_before = 0;
842: if ((out->len -= n) == empty_buf_len) {
843: out->pos = 0;
844: restore_iobuf_size(out);
845: if (empty_buf_len)
846: iobuf.raw_data_header_pos = 0;
847: }
848: }
849:
850: if (got_kill_signal > 0)
851: handle_kill_signal(True);
852:
853: /* We need to help prevent deadlock by doing what reading
854: * we can whenever we are here trying to write. */
855: if (IN_MULTIPLEXED_AND_READY && !(flags & PIO_NEED_INPUT)) {
856: while (!iobuf.raw_input_ends_before && iobuf.in.len > 512)
857: read_a_msg();
858: if (flist_receiving_enabled && iobuf.in.len > 512)
859: wait_for_receiver(); /* generator only */
860: }
861:
862: if (ff_forward_fd >= 0 && FD_ISSET(ff_forward_fd, &r_fds)) {
863: /* This can potentially flush all output and enable
864: * multiplexed output, so keep this last in the loop
865: * and be sure to not cache anything that would break
866: * such a change. */
867: forward_filesfrom_data();
868: }
869: }
870: double_break:
871:
872: if (got_kill_signal > 0)
873: handle_kill_signal(True);
874:
875: data = iobuf.in.buf + iobuf.in.pos;
876:
877: if (flags & PIO_CONSUME_INPUT) {
878: iobuf.in.len -= needed;
879: iobuf.in.pos += needed;
880: if (iobuf.in.pos == iobuf.raw_input_ends_before)
881: iobuf.raw_input_ends_before = 0;
882: if (iobuf.in.pos >= iobuf.in.size) {
883: iobuf.in.pos -= iobuf.in.size;
884: if (iobuf.raw_input_ends_before)
885: iobuf.raw_input_ends_before -= iobuf.in.size;
886: }
887: }
888:
889: return data;
890: }
891:
892: static void raw_read_buf(char *buf, size_t len)
893: {
894: size_t pos = iobuf.in.pos;
895: char *data = perform_io(len, PIO_INPUT_AND_CONSUME);
896: if (iobuf.in.pos <= pos && len) {
897: size_t siz = len - iobuf.in.pos;
898: memcpy(buf, data, siz);
899: memcpy(buf + siz, iobuf.in.buf, iobuf.in.pos);
900: } else
901: memcpy(buf, data, len);
902: }
903:
904: static int32 raw_read_int(void)
905: {
906: char *data, buf[4];
907: if (iobuf.in.size - iobuf.in.pos >= 4)
908: data = perform_io(4, PIO_INPUT_AND_CONSUME);
909: else
910: raw_read_buf(data = buf, 4);
911: return IVAL(data, 0);
912: }
913:
914: void noop_io_until_death(void)
915: {
916: char buf[1024];
917:
918: if (!iobuf.in.buf || !iobuf.out.buf || iobuf.in_fd < 0 || iobuf.out_fd < 0 || kluge_around_eof)
919: return;
920:
921: kluge_around_eof = 2;
922: /* Setting an I/O timeout ensures that if something inexplicably weird
923: * happens, we won't hang around forever. */
924: if (!io_timeout)
925: set_io_timeout(60);
926:
927: while (1)
928: read_buf(iobuf.in_fd, buf, sizeof buf);
929: }
930:
931: /* Buffer a message for the multiplexed output stream. Is not used for (normal) MSG_DATA. */
932: int send_msg(enum msgcode code, const char *buf, size_t len, int convert)
933: {
934: char *hdr;
935: size_t needed, pos;
936: BOOL want_debug = DEBUG_GTE(IO, 1) && convert >= 0 && (msgs2stderr || code != MSG_INFO);
937:
938: if (!OUT_MULTIPLEXED)
939: return 0;
940:
941: if (want_debug)
942: rprintf(FINFO, "[%s] send_msg(%d, %ld)\n", who_am_i(), (int)code, (long)len);
943:
944: /* When checking for enough free space for this message, we need to
945: * make sure that there is space for the 4-byte header, plus we'll
946: * assume that we may waste up to 3 bytes (if the header doesn't fit
947: * at the physical end of the buffer). */
948: #ifdef ICONV_OPTION
949: if (convert > 0 && ic_send == (iconv_t)-1)
950: convert = 0;
951: if (convert > 0) {
952: /* Ensuring double-size room leaves space for maximal conversion expansion. */
953: needed = len*2 + 4 + 3;
954: } else
955: #endif
956: needed = len + 4 + 3;
957: if (iobuf.msg.len + needed > iobuf.msg.size)
958: perform_io(needed, PIO_NEED_MSGROOM);
959:
960: pos = iobuf.msg.pos + iobuf.msg.len; /* Must be set after any flushing. */
961: if (pos >= iobuf.msg.size)
962: pos -= iobuf.msg.size;
963: else if (pos + 4 > iobuf.msg.size) {
964: /* The 4-byte header won't fit at the end of the buffer,
965: * so we'll temporarily reduce the message buffer's size
966: * and put the header at the start of the buffer. */
967: reduce_iobuf_size(&iobuf.msg, pos);
968: pos = 0;
969: }
970: hdr = iobuf.msg.buf + pos;
971:
972: iobuf.msg.len += 4; /* Allocate room for the coming header bytes. */
973:
974: #ifdef ICONV_OPTION
975: if (convert > 0) {
976: xbuf inbuf;
977:
978: INIT_XBUF(inbuf, (char*)buf, len, (size_t)-1);
979:
980: len = iobuf.msg.len;
981: iconvbufs(ic_send, &inbuf, &iobuf.msg,
982: ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_CIRCULAR_OUT | ICB_INIT);
983: if (inbuf.len > 0) {
984: rprintf(FERROR, "overflowed iobuf.msg buffer in send_msg");
985: exit_cleanup(RERR_UNSUPPORTED);
986: }
987: len = iobuf.msg.len - len;
988: } else
989: #endif
990: {
991: size_t siz;
992:
993: if ((pos += 4) == iobuf.msg.size)
994: pos = 0;
995:
996: /* Handle a split copy if we wrap around the end of the circular buffer. */
997: if (pos >= iobuf.msg.pos && (siz = iobuf.msg.size - pos) < len) {
998: memcpy(iobuf.msg.buf + pos, buf, siz);
999: memcpy(iobuf.msg.buf, buf + siz, len - siz);
1000: } else
1001: memcpy(iobuf.msg.buf + pos, buf, len);
1002:
1003: iobuf.msg.len += len;
1004: }
1005:
1006: SIVAL(hdr, 0, ((MPLEX_BASE + (int)code)<<24) + len);
1007:
1008: if (want_debug && convert > 0)
1009: rprintf(FINFO, "[%s] converted msg len=%ld\n", who_am_i(), (long)len);
1010:
1011: return 1;
1012: }
1013:
1014: void send_msg_int(enum msgcode code, int num)
1015: {
1016: char numbuf[4];
1017:
1018: if (DEBUG_GTE(IO, 1))
1019: rprintf(FINFO, "[%s] send_msg_int(%d, %d)\n", who_am_i(), (int)code, num);
1020:
1021: SIVAL(numbuf, 0, num);
1022: send_msg(code, numbuf, 4, -1);
1023: }
1024:
1025: static void got_flist_entry_status(enum festatus status, int ndx)
1026: {
1027: struct file_list *flist = flist_for_ndx(ndx, "got_flist_entry_status");
1028:
1029: if (remove_source_files) {
1030: active_filecnt--;
1031: active_bytecnt -= F_LENGTH(flist->files[ndx - flist->ndx_start]);
1032: }
1033:
1034: if (inc_recurse)
1035: flist->in_progress--;
1036:
1037: switch (status) {
1038: case FES_SUCCESS:
1039: if (remove_source_files)
1040: send_msg_int(MSG_SUCCESS, ndx);
1041: /* FALL THROUGH */
1042: case FES_NO_SEND:
1043: #ifdef SUPPORT_HARD_LINKS
1044: if (preserve_hard_links) {
1045: struct file_struct *file = flist->files[ndx - flist->ndx_start];
1046: if (F_IS_HLINKED(file)) {
1047: if (status == FES_NO_SEND)
1048: flist_ndx_push(&hlink_list, -2); /* indicates a failure follows */
1049: flist_ndx_push(&hlink_list, ndx);
1050: if (inc_recurse)
1051: flist->in_progress++;
1052: }
1053: }
1054: #endif
1055: break;
1056: case FES_REDO:
1057: if (read_batch) {
1058: if (inc_recurse)
1059: flist->in_progress++;
1060: break;
1061: }
1062: if (inc_recurse)
1063: flist->to_redo++;
1064: flist_ndx_push(&redo_list, ndx);
1065: break;
1066: }
1067: }
1068:
1069: /* Note the fds used for the main socket (which might really be a pipe
1070: * for a local transfer, but we can ignore that). */
1071: void io_set_sock_fds(int f_in, int f_out)
1072: {
1073: sock_f_in = f_in;
1074: sock_f_out = f_out;
1075: }
1076:
1077: void set_io_timeout(int secs)
1078: {
1079: io_timeout = secs;
1080: allowed_lull = (io_timeout + 1) / 2;
1081:
1082: if (!io_timeout || allowed_lull > SELECT_TIMEOUT)
1083: select_timeout = SELECT_TIMEOUT;
1084: else
1085: select_timeout = allowed_lull;
1086:
1087: if (read_batch)
1088: allowed_lull = 0;
1089: }
1090:
1091: static void check_for_d_option_error(const char *msg)
1092: {
1093: static char rsync263_opts[] = "BCDHIKLPRSTWabceghlnopqrtuvxz";
1094: char *colon;
1095: int saw_d = 0;
1096:
1097: if (*msg != 'r'
1098: || strncmp(msg, REMOTE_OPTION_ERROR, sizeof REMOTE_OPTION_ERROR - 1) != 0)
1099: return;
1100:
1101: msg += sizeof REMOTE_OPTION_ERROR - 1;
1102: if (*msg == '-' || (colon = strchr(msg, ':')) == NULL
1103: || strncmp(colon, REMOTE_OPTION_ERROR2, sizeof REMOTE_OPTION_ERROR2 - 1) != 0)
1104: return;
1105:
1106: for ( ; *msg != ':'; msg++) {
1107: if (*msg == 'd')
1108: saw_d = 1;
1109: else if (*msg == 'e')
1110: break;
1111: else if (strchr(rsync263_opts, *msg) == NULL)
1112: return;
1113: }
1114:
1115: if (saw_d) {
1116: rprintf(FWARNING,
1117: "*** Try using \"--old-d\" if remote rsync is <= 2.6.3 ***\n");
1118: }
1119: }
1120:
1121: /* This is used by the generator to limit how many file transfers can
1122: * be active at once when --remove-source-files is specified. Without
1123: * this, sender-side deletions were mostly happening at the end. */
1124: void increment_active_files(int ndx, int itemizing, enum logcode code)
1125: {
1126: while (1) {
1127: /* TODO: tune these limits? */
1128: int limit = active_bytecnt >= 128*1024 ? 10 : 50;
1129: if (active_filecnt < limit)
1130: break;
1131: check_for_finished_files(itemizing, code, 0);
1132: if (active_filecnt < limit)
1133: break;
1134: wait_for_receiver();
1135: }
1136:
1137: active_filecnt++;
1138: active_bytecnt += F_LENGTH(cur_flist->files[ndx - cur_flist->ndx_start]);
1139: }
1140:
1141: int get_redo_num(void)
1142: {
1143: return flist_ndx_pop(&redo_list);
1144: }
1145:
1146: int get_hlink_num(void)
1147: {
1148: return flist_ndx_pop(&hlink_list);
1149: }
1150:
1151: /* When we're the receiver and we have a local --files-from list of names
1152: * that needs to be sent over the socket to the sender, we have to do two
1153: * things at the same time: send the sender a list of what files we're
1154: * processing and read the incoming file+info list from the sender. We do
1155: * this by making recv_file_list() call forward_filesfrom_data(), which
1156: * will ensure that we forward data to the sender until we get some data
1157: * for recv_file_list() to use. */
1158: void start_filesfrom_forwarding(int fd)
1159: {
1160: if (protocol_version < 31 && OUT_MULTIPLEXED) {
1161: /* Older protocols send the files-from data w/o packaging
1162: * it in multiplexed I/O packets, so temporarily switch
1163: * to buffered I/O to match this behavior. */
1164: iobuf.msg.pos = iobuf.msg.len = 0; /* Be extra sure no messages go out. */
1165: ff_reenable_multiplex = io_end_multiplex_out(MPLX_TO_BUFFERED);
1166: }
1167: ff_forward_fd = fd;
1168:
1169: alloc_xbuf(&ff_xb, FILESFROM_BUFLEN);
1170: }
1171:
1172: /* Read a line into the "buf" buffer. */
1173: int read_line(int fd, char *buf, size_t bufsiz, int flags)
1174: {
1175: char ch, *s, *eob;
1176:
1177: #ifdef ICONV_OPTION
1178: if (flags & RL_CONVERT && iconv_buf.size < bufsiz)
1179: realloc_xbuf(&iconv_buf, bufsiz + 1024);
1180: #endif
1181:
1182: start:
1183: #ifdef ICONV_OPTION
1184: s = flags & RL_CONVERT ? iconv_buf.buf : buf;
1185: #else
1186: s = buf;
1187: #endif
1188: eob = s + bufsiz - 1;
1189: while (1) {
1190: /* We avoid read_byte() for files because files can return an EOF. */
1191: if (fd == iobuf.in_fd)
1192: ch = read_byte(fd);
1193: else if (safe_read(fd, &ch, 1) == 0)
1194: break;
1195: if (flags & RL_EOL_NULLS ? ch == '\0' : (ch == '\r' || ch == '\n')) {
1196: /* Skip empty lines if dumping comments. */
1197: if (flags & RL_DUMP_COMMENTS && s == buf)
1198: continue;
1199: break;
1200: }
1201: if (s < eob)
1202: *s++ = ch;
1203: }
1204: *s = '\0';
1205:
1206: if (flags & RL_DUMP_COMMENTS && (*buf == '#' || *buf == ';'))
1207: goto start;
1208:
1209: #ifdef ICONV_OPTION
1210: if (flags & RL_CONVERT) {
1211: xbuf outbuf;
1212: INIT_XBUF(outbuf, buf, 0, bufsiz);
1213: iconv_buf.pos = 0;
1214: iconv_buf.len = s - iconv_buf.buf;
1215: iconvbufs(ic_recv, &iconv_buf, &outbuf,
1216: ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_INIT);
1217: outbuf.buf[outbuf.len] = '\0';
1218: return outbuf.len;
1219: }
1220: #endif
1221:
1222: return s - buf;
1223: }
1224:
1225: void read_args(int f_in, char *mod_name, char *buf, size_t bufsiz, int rl_nulls,
1226: char ***argv_p, int *argc_p, char **request_p)
1227: {
1228: int maxargs = MAX_ARGS;
1229: int dot_pos = 0, argc = 0, request_len = 0;
1230: char **argv, *p;
1231: int rl_flags = (rl_nulls ? RL_EOL_NULLS : 0);
1232:
1233: #ifdef ICONV_OPTION
1234: rl_flags |= (protect_args && ic_recv != (iconv_t)-1 ? RL_CONVERT : 0);
1235: #endif
1236:
1237: if (!(argv = new_array(char *, maxargs)))
1238: out_of_memory("read_args");
1239: if (mod_name && !protect_args)
1240: argv[argc++] = "rsyncd";
1241:
1242: if (request_p)
1243: *request_p = NULL;
1244:
1245: while (1) {
1246: if (read_line(f_in, buf, bufsiz, rl_flags) == 0)
1247: break;
1248:
1249: if (argc == maxargs-1) {
1250: maxargs += MAX_ARGS;
1251: if (!(argv = realloc_array(argv, char *, maxargs)))
1252: out_of_memory("read_args");
1253: }
1254:
1255: if (dot_pos) {
1256: if (request_p && request_len < 1024) {
1257: int len = strlen(buf);
1258: if (request_len)
1259: request_p[0][request_len++] = ' ';
1260: if (!(*request_p = realloc_array(*request_p, char, request_len + len + 1)))
1261: out_of_memory("read_args");
1262: memcpy(*request_p + request_len, buf, len + 1);
1263: request_len += len;
1264: }
1265: if (mod_name)
1266: glob_expand_module(mod_name, buf, &argv, &argc, &maxargs);
1267: else
1268: glob_expand(buf, &argv, &argc, &maxargs);
1269: } else {
1270: if (!(p = strdup(buf)))
1271: out_of_memory("read_args");
1272: argv[argc++] = p;
1273: if (*p == '.' && p[1] == '\0')
1274: dot_pos = argc;
1275: }
1276: }
1277: argv[argc] = NULL;
1278:
1279: glob_expand(NULL, NULL, NULL, NULL);
1280:
1281: *argc_p = argc;
1282: *argv_p = argv;
1283: }
1284:
1285: BOOL io_start_buffering_out(int f_out)
1286: {
1287: if (msgs2stderr && DEBUG_GTE(IO, 2))
1288: rprintf(FINFO, "[%s] io_start_buffering_out(%d)\n", who_am_i(), f_out);
1289:
1290: if (iobuf.out.buf) {
1291: if (iobuf.out_fd == -1)
1292: iobuf.out_fd = f_out;
1293: else
1294: assert(f_out == iobuf.out_fd);
1295: return False;
1296: }
1297:
1298: alloc_xbuf(&iobuf.out, ROUND_UP_1024(IO_BUFFER_SIZE * 2));
1299: iobuf.out_fd = f_out;
1300:
1301: return True;
1302: }
1303:
1304: BOOL io_start_buffering_in(int f_in)
1305: {
1306: if (msgs2stderr && DEBUG_GTE(IO, 2))
1307: rprintf(FINFO, "[%s] io_start_buffering_in(%d)\n", who_am_i(), f_in);
1308:
1309: if (iobuf.in.buf) {
1310: if (iobuf.in_fd == -1)
1311: iobuf.in_fd = f_in;
1312: else
1313: assert(f_in == iobuf.in_fd);
1314: return False;
1315: }
1316:
1317: alloc_xbuf(&iobuf.in, ROUND_UP_1024(IO_BUFFER_SIZE));
1318: iobuf.in_fd = f_in;
1319:
1320: return True;
1321: }
1322:
1323: void io_end_buffering_in(BOOL free_buffers)
1324: {
1325: if (msgs2stderr && DEBUG_GTE(IO, 2)) {
1326: rprintf(FINFO, "[%s] io_end_buffering_in(IOBUF_%s_BUFS)\n",
1327: who_am_i(), free_buffers ? "FREE" : "KEEP");
1328: }
1329:
1330: if (free_buffers)
1331: free_xbuf(&iobuf.in);
1332: else
1333: iobuf.in.pos = iobuf.in.len = 0;
1334:
1335: iobuf.in_fd = -1;
1336: }
1337:
1338: void io_end_buffering_out(BOOL free_buffers)
1339: {
1340: if (msgs2stderr && DEBUG_GTE(IO, 2)) {
1341: rprintf(FINFO, "[%s] io_end_buffering_out(IOBUF_%s_BUFS)\n",
1342: who_am_i(), free_buffers ? "FREE" : "KEEP");
1343: }
1344:
1345: io_flush(FULL_FLUSH);
1346:
1347: if (free_buffers) {
1348: free_xbuf(&iobuf.out);
1349: free_xbuf(&iobuf.msg);
1350: }
1351:
1352: iobuf.out_fd = -1;
1353: }
1354:
1355: void maybe_flush_socket(int important)
1356: {
1357: if (flist_eof && iobuf.out.buf && iobuf.out.len > iobuf.out_empty_len
1358: && (important || time(NULL) - last_io_out >= 5))
1359: io_flush(NORMAL_FLUSH);
1360: }
1361:
1362: /* Older rsync versions used to send either a MSG_NOOP (protocol 30) or a
1363: * raw-data-based keep-alive (protocol 29), both of which implied forwarding of
1364: * the message through the sender. Since the new timeout method does not need
1365: * any forwarding, we just send an empty MSG_DATA message, which works with all
1366: * rsync versions. This avoids any message forwarding, and leaves the raw-data
1367: * stream alone (since we can never be quite sure if that stream is in the
1368: * right state for a keep-alive message). */
1369: void maybe_send_keepalive(time_t now, int flags)
1370: {
1371: if (flags & MSK_ACTIVE_RECEIVER)
1372: last_io_in = now; /* Fudge things when we're working hard on the files. */
1373:
1374: /* Early in the transfer (before the receiver forks) the receiving side doesn't
1375: * care if it hasn't sent data in a while as long as it is receiving data (in
1376: * fact, a pre-3.1.0 rsync would die if we tried to send it a keep alive during
1377: * this time). So, if we're an early-receiving proc, just return and let the
1378: * incoming data determine if we timeout. */
1379: if (!am_sender && !am_receiver && !am_generator)
1380: return;
1381:
1382: if (now - last_io_out >= allowed_lull) {
1383: /* The receiver is special: it only sends keep-alive messages if it is
1384: * actively receiving data. Otherwise, it lets the generator timeout. */
1385: if (am_receiver && now - last_io_in >= io_timeout)
1386: return;
1387:
1388: if (!iobuf.msg.len && iobuf.out.len == iobuf.out_empty_len)
1389: send_msg(MSG_DATA, "", 0, 0);
1390: if (!(flags & MSK_ALLOW_FLUSH)) {
1391: /* Let the caller worry about writing out the data. */
1392: } else if (iobuf.msg.len)
1393: perform_io(iobuf.msg.size - iobuf.msg.len + 1, PIO_NEED_MSGROOM);
1394: else if (iobuf.out.len > iobuf.out_empty_len)
1395: io_flush(NORMAL_FLUSH);
1396: }
1397: }
1398:
1399: void start_flist_forward(int ndx)
1400: {
1401: write_int(iobuf.out_fd, ndx);
1402: forward_flist_data = 1;
1403: }
1404:
1405: void stop_flist_forward(void)
1406: {
1407: forward_flist_data = 0;
1408: }
1409:
1410: /* Read a message from a multiplexed source. */
1411: static void read_a_msg(void)
1412: {
1413: char data[BIGPATHBUFLEN];
1414: int tag, val;
1415: size_t msg_bytes;
1416:
1417: /* This ensures that perform_io() does not try to do any message reading
1418: * until we've read all of the data for this message. We should also
1419: * try to avoid calling things that will cause data to be written via
1420: * perform_io() prior to this being reset to 1. */
1421: iobuf.in_multiplexed = -1;
1422:
1423: tag = raw_read_int();
1424:
1425: msg_bytes = tag & 0xFFFFFF;
1426: tag = (tag >> 24) - MPLEX_BASE;
1427:
1428: if (DEBUG_GTE(IO, 1) && msgs2stderr)
1429: rprintf(FINFO, "[%s] got msg=%d, len=%ld\n", who_am_i(), (int)tag, (long)msg_bytes);
1430:
1431: switch (tag) {
1432: case MSG_DATA:
1433: assert(iobuf.raw_input_ends_before == 0);
1434: /* Though this does not yet read the data, we do mark where in
1435: * the buffer the msg data will end once it is read. It is
1436: * possible that this points off the end of the buffer, in
1437: * which case the gradual reading of the input stream will
1438: * cause this value to wrap around and eventually become real. */
1439: if (msg_bytes)
1440: iobuf.raw_input_ends_before = iobuf.in.pos + msg_bytes;
1441: iobuf.in_multiplexed = 1;
1442: break;
1443: case MSG_STATS:
1444: if (msg_bytes != sizeof stats.total_read || !am_generator)
1445: goto invalid_msg;
1446: raw_read_buf((char*)&stats.total_read, sizeof stats.total_read);
1447: iobuf.in_multiplexed = 1;
1448: break;
1449: case MSG_REDO:
1450: if (msg_bytes != 4 || !am_generator)
1451: goto invalid_msg;
1452: val = raw_read_int();
1453: iobuf.in_multiplexed = 1;
1454: got_flist_entry_status(FES_REDO, val);
1455: break;
1456: case MSG_IO_ERROR:
1457: if (msg_bytes != 4)
1458: goto invalid_msg;
1459: val = raw_read_int();
1460: iobuf.in_multiplexed = 1;
1461: io_error |= val;
1462: if (am_receiver)
1463: send_msg_int(MSG_IO_ERROR, val);
1464: break;
1465: case MSG_IO_TIMEOUT:
1466: if (msg_bytes != 4 || am_server || am_generator)
1467: goto invalid_msg;
1468: val = raw_read_int();
1469: iobuf.in_multiplexed = 1;
1470: if (!io_timeout || io_timeout > val) {
1471: if (INFO_GTE(MISC, 2))
1472: rprintf(FINFO, "Setting --timeout=%d to match server\n", val);
1473: set_io_timeout(val);
1474: }
1475: break;
1476: case MSG_NOOP:
1477: /* Support protocol-30 keep-alive method. */
1478: if (msg_bytes != 0)
1479: goto invalid_msg;
1480: iobuf.in_multiplexed = 1;
1481: if (am_sender)
1482: maybe_send_keepalive(time(NULL), MSK_ALLOW_FLUSH);
1483: break;
1484: case MSG_DELETED:
1485: if (msg_bytes >= sizeof data)
1486: goto overflow;
1487: if (am_generator) {
1488: raw_read_buf(data, msg_bytes);
1489: iobuf.in_multiplexed = 1;
1490: send_msg(MSG_DELETED, data, msg_bytes, 1);
1491: break;
1492: }
1493: #ifdef ICONV_OPTION
1494: if (ic_recv != (iconv_t)-1) {
1495: xbuf outbuf, inbuf;
1496: char ibuf[512];
1497: int add_null = 0;
1498: int flags = ICB_INCLUDE_BAD | ICB_INIT;
1499:
1500: INIT_CONST_XBUF(outbuf, data);
1501: INIT_XBUF(inbuf, ibuf, 0, (size_t)-1);
1502:
1503: while (msg_bytes) {
1504: size_t len = msg_bytes > sizeof ibuf - inbuf.len ? sizeof ibuf - inbuf.len : msg_bytes;
1505: raw_read_buf(ibuf + inbuf.len, len);
1506: inbuf.pos = 0;
1507: inbuf.len += len;
1508: if (!(msg_bytes -= len) && !ibuf[inbuf.len-1])
1509: inbuf.len--, add_null = 1;
1510: if (iconvbufs(ic_send, &inbuf, &outbuf, flags) < 0) {
1511: if (errno == E2BIG)
1512: goto overflow;
1513: /* Buffer ended with an incomplete char, so move the
1514: * bytes to the start of the buffer and continue. */
1515: memmove(ibuf, ibuf + inbuf.pos, inbuf.len);
1516: }
1517: flags &= ~ICB_INIT;
1518: }
1519: if (add_null) {
1520: if (outbuf.len == outbuf.size)
1521: goto overflow;
1522: outbuf.buf[outbuf.len++] = '\0';
1523: }
1524: msg_bytes = outbuf.len;
1525: } else
1526: #endif
1527: raw_read_buf(data, msg_bytes);
1528: iobuf.in_multiplexed = 1;
1529: /* A directory name was sent with the trailing null */
1530: if (msg_bytes > 0 && !data[msg_bytes-1])
1531: log_delete(data, S_IFDIR);
1532: else {
1533: data[msg_bytes] = '\0';
1534: log_delete(data, S_IFREG);
1535: }
1536: break;
1537: case MSG_SUCCESS:
1538: if (msg_bytes != 4) {
1539: invalid_msg:
1540: rprintf(FERROR, "invalid multi-message %d:%lu [%s%s]\n",
1541: tag, (unsigned long)msg_bytes, who_am_i(),
1542: inc_recurse ? "/inc" : "");
1543: exit_cleanup(RERR_STREAMIO);
1544: }
1545: val = raw_read_int();
1546: iobuf.in_multiplexed = 1;
1547: if (am_generator)
1548: got_flist_entry_status(FES_SUCCESS, val);
1549: else
1550: successful_send(val);
1551: break;
1552: case MSG_NO_SEND:
1553: if (msg_bytes != 4)
1554: goto invalid_msg;
1555: val = raw_read_int();
1556: iobuf.in_multiplexed = 1;
1557: if (am_generator)
1558: got_flist_entry_status(FES_NO_SEND, val);
1559: else
1560: send_msg_int(MSG_NO_SEND, val);
1561: break;
1562: case MSG_ERROR_SOCKET:
1563: case MSG_ERROR_UTF8:
1564: case MSG_CLIENT:
1565: case MSG_LOG:
1566: if (!am_generator)
1567: goto invalid_msg;
1568: if (tag == MSG_ERROR_SOCKET)
1569: msgs2stderr = 1;
1570: /* FALL THROUGH */
1571: case MSG_INFO:
1572: case MSG_ERROR:
1573: case MSG_ERROR_XFER:
1574: case MSG_WARNING:
1575: if (msg_bytes >= sizeof data) {
1576: overflow:
1577: rprintf(FERROR,
1578: "multiplexing overflow %d:%lu [%s%s]\n",
1579: tag, (unsigned long)msg_bytes, who_am_i(),
1580: inc_recurse ? "/inc" : "");
1581: exit_cleanup(RERR_STREAMIO);
1582: }
1583: raw_read_buf(data, msg_bytes);
1584: /* We don't set in_multiplexed value back to 1 before writing this message
1585: * because the write might loop back and read yet another message, over and
1586: * over again, while waiting for room to put the message in the msg buffer. */
1587: rwrite((enum logcode)tag, data, msg_bytes, !am_generator);
1588: iobuf.in_multiplexed = 1;
1589: if (first_message) {
1590: if (list_only && !am_sender && tag == 1 && msg_bytes < sizeof data) {
1591: data[msg_bytes] = '\0';
1592: check_for_d_option_error(data);
1593: }
1594: first_message = 0;
1595: }
1596: break;
1597: case MSG_ERROR_EXIT:
1598: if (msg_bytes == 4)
1599: val = raw_read_int();
1600: else if (msg_bytes == 0)
1601: val = 0;
1602: else
1603: goto invalid_msg;
1604: iobuf.in_multiplexed = 1;
1605: if (DEBUG_GTE(EXIT, 3))
1606: rprintf(FINFO, "[%s] got MSG_ERROR_EXIT with %ld bytes\n", who_am_i(), (long)msg_bytes);
1607: if (msg_bytes == 0) {
1608: if (!am_sender && !am_generator) {
1609: if (DEBUG_GTE(EXIT, 3)) {
1610: rprintf(FINFO, "[%s] sending MSG_ERROR_EXIT (len 0)\n",
1611: who_am_i());
1612: }
1613: send_msg(MSG_ERROR_EXIT, "", 0, 0);
1614: io_flush(FULL_FLUSH);
1615: }
1616: } else if (protocol_version >= 31) {
1617: if (am_generator || am_receiver) {
1618: if (DEBUG_GTE(EXIT, 3)) {
1619: rprintf(FINFO, "[%s] sending MSG_ERROR_EXIT with exit_code %d\n",
1620: who_am_i(), val);
1621: }
1622: send_msg_int(MSG_ERROR_EXIT, val);
1623: } else {
1624: if (DEBUG_GTE(EXIT, 3)) {
1625: rprintf(FINFO, "[%s] sending MSG_ERROR_EXIT (len 0)\n",
1626: who_am_i());
1627: }
1628: send_msg(MSG_ERROR_EXIT, "", 0, 0);
1629: }
1630: }
1631: /* Send a negative linenum so that we don't end up
1632: * with a duplicate exit message. */
1633: _exit_cleanup(val, __FILE__, 0 - __LINE__);
1634: default:
1635: rprintf(FERROR, "unexpected tag %d [%s%s]\n",
1636: tag, who_am_i(), inc_recurse ? "/inc" : "");
1637: exit_cleanup(RERR_STREAMIO);
1638: }
1639:
1640: assert(iobuf.in_multiplexed > 0);
1641: }
1642:
1643: static void drain_multiplex_messages(void)
1644: {
1645: while (IN_MULTIPLEXED_AND_READY && iobuf.in.len) {
1646: if (iobuf.raw_input_ends_before) {
1647: size_t raw_len = iobuf.raw_input_ends_before - iobuf.in.pos;
1648: iobuf.raw_input_ends_before = 0;
1649: if (raw_len >= iobuf.in.len) {
1650: iobuf.in.len = 0;
1651: break;
1652: }
1653: iobuf.in.len -= raw_len;
1654: if ((iobuf.in.pos += raw_len) >= iobuf.in.size)
1655: iobuf.in.pos -= iobuf.in.size;
1656: }
1657: read_a_msg();
1658: }
1659: }
1660:
1661: void wait_for_receiver(void)
1662: {
1663: if (!iobuf.raw_input_ends_before)
1664: read_a_msg();
1665:
1666: if (iobuf.raw_input_ends_before) {
1667: int ndx = read_int(iobuf.in_fd);
1668: if (ndx < 0) {
1669: switch (ndx) {
1670: case NDX_FLIST_EOF:
1671: flist_eof = 1;
1672: if (DEBUG_GTE(FLIST, 3))
1673: rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
1674: break;
1675: case NDX_DONE:
1676: msgdone_cnt++;
1677: break;
1678: default:
1679: exit_cleanup(RERR_STREAMIO);
1680: }
1681: } else {
1682: struct file_list *flist;
1683: flist_receiving_enabled = False;
1684: if (DEBUG_GTE(FLIST, 2)) {
1685: rprintf(FINFO, "[%s] receiving flist for dir %d\n",
1686: who_am_i(), ndx);
1687: }
1688: flist = recv_file_list(iobuf.in_fd, ndx);
1689: flist->parent_ndx = ndx;
1690: #ifdef SUPPORT_HARD_LINKS
1691: if (preserve_hard_links)
1692: match_hard_links(flist);
1693: #endif
1694: flist_receiving_enabled = True;
1695: }
1696: }
1697: }
1698:
1699: unsigned short read_shortint(int f)
1700: {
1701: char b[2];
1702: read_buf(f, b, 2);
1703: return (UVAL(b, 1) << 8) + UVAL(b, 0);
1704: }
1705:
1706: int32 read_int(int f)
1707: {
1708: char b[4];
1709: int32 num;
1710:
1711: read_buf(f, b, 4);
1712: num = IVAL(b, 0);
1713: #if SIZEOF_INT32 > 4
1714: if (num & (int32)0x80000000)
1715: num |= ~(int32)0xffffffff;
1716: #endif
1717: return num;
1718: }
1719:
1720: int32 read_varint(int f)
1721: {
1722: union {
1723: char b[5];
1724: int32 x;
1725: } u;
1726: uchar ch;
1727: int extra;
1728:
1729: u.x = 0;
1730: ch = read_byte(f);
1731: extra = int_byte_extra[ch / 4];
1732: if (extra) {
1733: uchar bit = ((uchar)1<<(8-extra));
1734: if (extra >= (int)sizeof u.b) {
1735: rprintf(FERROR, "Overflow in read_varint()\n");
1736: exit_cleanup(RERR_STREAMIO);
1737: }
1738: read_buf(f, u.b, extra);
1739: u.b[extra] = ch & (bit-1);
1740: } else
1741: u.b[0] = ch;
1742: #if CAREFUL_ALIGNMENT
1743: u.x = IVAL(u.b,0);
1744: #endif
1745: #if SIZEOF_INT32 > 4
1746: if (u.x & (int32)0x80000000)
1747: u.x |= ~(int32)0xffffffff;
1748: #endif
1749: return u.x;
1750: }
1751:
1752: int64 read_varlong(int f, uchar min_bytes)
1753: {
1754: union {
1755: char b[9];
1756: int64 x;
1757: } u;
1758: char b2[8];
1759: int extra;
1760:
1761: #if SIZEOF_INT64 < 8
1762: memset(u.b, 0, 8);
1763: #else
1764: u.x = 0;
1765: #endif
1766: read_buf(f, b2, min_bytes);
1767: memcpy(u.b, b2+1, min_bytes-1);
1768: extra = int_byte_extra[CVAL(b2, 0) / 4];
1769: if (extra) {
1770: uchar bit = ((uchar)1<<(8-extra));
1771: if (min_bytes + extra > (int)sizeof u.b) {
1772: rprintf(FERROR, "Overflow in read_varlong()\n");
1773: exit_cleanup(RERR_STREAMIO);
1774: }
1775: read_buf(f, u.b + min_bytes - 1, extra);
1776: u.b[min_bytes + extra - 1] = CVAL(b2, 0) & (bit-1);
1777: #if SIZEOF_INT64 < 8
1778: if (min_bytes + extra > 5 || u.b[4] || CVAL(u.b,3) & 0x80) {
1779: rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
1780: exit_cleanup(RERR_UNSUPPORTED);
1781: }
1782: #endif
1783: } else
1784: u.b[min_bytes + extra - 1] = CVAL(b2, 0);
1785: #if SIZEOF_INT64 < 8
1786: u.x = IVAL(u.b,0);
1787: #elif CAREFUL_ALIGNMENT
1788: u.x = IVAL64(u.b,0);
1789: #endif
1790: return u.x;
1791: }
1792:
1793: int64 read_longint(int f)
1794: {
1795: #if SIZEOF_INT64 >= 8
1796: char b[9];
1797: #endif
1798: int32 num = read_int(f);
1799:
1800: if (num != (int32)0xffffffff)
1801: return num;
1802:
1803: #if SIZEOF_INT64 < 8
1804: rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
1805: exit_cleanup(RERR_UNSUPPORTED);
1806: #else
1807: read_buf(f, b, 8);
1808: return IVAL(b,0) | (((int64)IVAL(b,4))<<32);
1809: #endif
1810: }
1811:
1812: void read_buf(int f, char *buf, size_t len)
1813: {
1814: if (f != iobuf.in_fd) {
1815: if (safe_read(f, buf, len) != len)
1816: whine_about_eof(False); /* Doesn't return. */
1817: goto batch_copy;
1818: }
1819:
1820: if (!IN_MULTIPLEXED) {
1821: raw_read_buf(buf, len);
1822: total_data_read += len;
1823: if (forward_flist_data)
1824: write_buf(iobuf.out_fd, buf, len);
1825: batch_copy:
1826: if (f == write_batch_monitor_in)
1827: safe_write(batch_fd, buf, len);
1828: return;
1829: }
1830:
1831: while (1) {
1832: size_t siz;
1833:
1834: while (!iobuf.raw_input_ends_before)
1835: read_a_msg();
1836:
1837: siz = MIN(len, iobuf.raw_input_ends_before - iobuf.in.pos);
1838: if (siz >= iobuf.in.size)
1839: siz = iobuf.in.size;
1840: raw_read_buf(buf, siz);
1841: total_data_read += siz;
1842:
1843: if (forward_flist_data)
1844: write_buf(iobuf.out_fd, buf, siz);
1845:
1846: if (f == write_batch_monitor_in)
1847: safe_write(batch_fd, buf, siz);
1848:
1849: if ((len -= siz) == 0)
1850: break;
1851: buf += siz;
1852: }
1853: }
1854:
1855: void read_sbuf(int f, char *buf, size_t len)
1856: {
1857: read_buf(f, buf, len);
1858: buf[len] = '\0';
1859: }
1860:
1861: uchar read_byte(int f)
1862: {
1863: uchar c;
1864: read_buf(f, (char*)&c, 1);
1865: return c;
1866: }
1867:
1868: int read_vstring(int f, char *buf, int bufsize)
1869: {
1870: int len = read_byte(f);
1871:
1872: if (len & 0x80)
1873: len = (len & ~0x80) * 0x100 + read_byte(f);
1874:
1875: if (len >= bufsize) {
1876: rprintf(FERROR, "over-long vstring received (%d > %d)\n",
1877: len, bufsize - 1);
1878: return -1;
1879: }
1880:
1881: if (len)
1882: read_buf(f, buf, len);
1883: buf[len] = '\0';
1884: return len;
1885: }
1886:
1887: /* Populate a sum_struct with values from the socket. This is
1888: * called by both the sender and the receiver. */
1889: void read_sum_head(int f, struct sum_struct *sum)
1890: {
1891: int32 max_blength = protocol_version < 30 ? OLD_MAX_BLOCK_SIZE : MAX_BLOCK_SIZE;
1892: sum->count = read_int(f);
1893: if (sum->count < 0) {
1894: rprintf(FERROR, "Invalid checksum count %ld [%s]\n",
1895: (long)sum->count, who_am_i());
1896: exit_cleanup(RERR_PROTOCOL);
1897: }
1898: sum->blength = read_int(f);
1899: if (sum->blength < 0 || sum->blength > max_blength) {
1900: rprintf(FERROR, "Invalid block length %ld [%s]\n",
1901: (long)sum->blength, who_am_i());
1902: exit_cleanup(RERR_PROTOCOL);
1903: }
1904: sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f);
1905: if (sum->s2length < 0 || sum->s2length > MAX_DIGEST_LEN) {
1906: rprintf(FERROR, "Invalid checksum length %d [%s]\n",
1907: sum->s2length, who_am_i());
1908: exit_cleanup(RERR_PROTOCOL);
1909: }
1910: sum->remainder = read_int(f);
1911: if (sum->remainder < 0 || sum->remainder > sum->blength) {
1912: rprintf(FERROR, "Invalid remainder length %ld [%s]\n",
1913: (long)sum->remainder, who_am_i());
1914: exit_cleanup(RERR_PROTOCOL);
1915: }
1916: }
1917:
1918: /* Send the values from a sum_struct over the socket. Set sum to
1919: * NULL if there are no checksums to send. This is called by both
1920: * the generator and the sender. */
1921: void write_sum_head(int f, struct sum_struct *sum)
1922: {
1923: static struct sum_struct null_sum;
1924:
1925: if (sum == NULL)
1926: sum = &null_sum;
1927:
1928: write_int(f, sum->count);
1929: write_int(f, sum->blength);
1930: if (protocol_version >= 27)
1931: write_int(f, sum->s2length);
1932: write_int(f, sum->remainder);
1933: }
1934:
1935: /* Sleep after writing to limit I/O bandwidth usage.
1936: *
1937: * @todo Rather than sleeping after each write, it might be better to
1938: * use some kind of averaging. The current algorithm seems to always
1939: * use a bit less bandwidth than specified, because it doesn't make up
1940: * for slow periods. But arguably this is a feature. In addition, we
1941: * ought to take the time used to write the data into account.
1942: *
1943: * During some phases of big transfers (file FOO is uptodate) this is
1944: * called with a small bytes_written every time. As the kernel has to
1945: * round small waits up to guarantee that we actually wait at least the
1946: * requested number of microseconds, this can become grossly inaccurate.
1947: * We therefore keep track of the bytes we've written over time and only
1948: * sleep when the accumulated delay is at least 1 tenth of a second. */
1949: static void sleep_for_bwlimit(int bytes_written)
1950: {
1951: static struct timeval prior_tv;
1952: static long total_written = 0;
1953: struct timeval tv, start_tv;
1954: long elapsed_usec, sleep_usec;
1955:
1956: #define ONE_SEC 1000000L /* # of microseconds in a second */
1957:
1958: total_written += bytes_written;
1959:
1960: gettimeofday(&start_tv, NULL);
1961: if (prior_tv.tv_sec) {
1962: elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC
1963: + (start_tv.tv_usec - prior_tv.tv_usec);
1964: total_written -= (int64)elapsed_usec * bwlimit / (ONE_SEC/1024);
1965: if (total_written < 0)
1966: total_written = 0;
1967: }
1968:
1969: sleep_usec = total_written * (ONE_SEC/1024) / bwlimit;
1970: if (sleep_usec < ONE_SEC / 10) {
1971: prior_tv = start_tv;
1972: return;
1973: }
1974:
1975: tv.tv_sec = sleep_usec / ONE_SEC;
1976: tv.tv_usec = sleep_usec % ONE_SEC;
1977: select(0, NULL, NULL, NULL, &tv);
1978:
1979: gettimeofday(&prior_tv, NULL);
1980: elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC
1981: + (prior_tv.tv_usec - start_tv.tv_usec);
1982: total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024);
1983: }
1984:
1985: void io_flush(int flush_it_all)
1986: {
1987: if (iobuf.out.len > iobuf.out_empty_len) {
1988: if (flush_it_all) /* FULL_FLUSH: flush everything in the output buffers */
1989: perform_io(iobuf.out.size - iobuf.out_empty_len, PIO_NEED_OUTROOM);
1990: else /* NORMAL_FLUSH: flush at least 1 byte */
1991: perform_io(iobuf.out.size - iobuf.out.len + 1, PIO_NEED_OUTROOM);
1992: }
1993: if (iobuf.msg.len)
1994: perform_io(iobuf.msg.size, PIO_NEED_MSGROOM);
1995: }
1996:
1997: void write_shortint(int f, unsigned short x)
1998: {
1999: char b[2];
2000: b[0] = (char)x;
2001: b[1] = (char)(x >> 8);
2002: write_buf(f, b, 2);
2003: }
2004:
2005: void write_int(int f, int32 x)
2006: {
2007: char b[4];
2008: SIVAL(b, 0, x);
2009: write_buf(f, b, 4);
2010: }
2011:
2012: void write_varint(int f, int32 x)
2013: {
2014: char b[5];
2015: uchar bit;
2016: int cnt = 4;
2017:
2018: SIVAL(b, 1, x);
2019:
2020: while (cnt > 1 && b[cnt] == 0)
2021: cnt--;
2022: bit = ((uchar)1<<(7-cnt+1));
2023: if (CVAL(b, cnt) >= bit) {
2024: cnt++;
2025: *b = ~(bit-1);
2026: } else if (cnt > 1)
2027: *b = b[cnt] | ~(bit*2-1);
2028: else
2029: *b = b[cnt];
2030:
2031: write_buf(f, b, cnt);
2032: }
2033:
2034: void write_varlong(int f, int64 x, uchar min_bytes)
2035: {
2036: char b[9];
2037: uchar bit;
2038: int cnt = 8;
2039:
2040: #if SIZEOF_INT64 >= 8
2041: SIVAL64(b, 1, x);
2042: #else
2043: SIVAL(b, 1, x);
2044: if (x <= 0x7FFFFFFF && x >= 0)
2045: memset(b + 5, 0, 4);
2046: else {
2047: rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
2048: exit_cleanup(RERR_UNSUPPORTED);
2049: }
2050: #endif
2051:
2052: while (cnt > min_bytes && b[cnt] == 0)
2053: cnt--;
2054: bit = ((uchar)1<<(7-cnt+min_bytes));
2055: if (CVAL(b, cnt) >= bit) {
2056: cnt++;
2057: *b = ~(bit-1);
2058: } else if (cnt > min_bytes)
2059: *b = b[cnt] | ~(bit*2-1);
2060: else
2061: *b = b[cnt];
2062:
2063: write_buf(f, b, cnt);
2064: }
2065:
2066: /*
2067: * Note: int64 may actually be a 32-bit type if ./configure couldn't find any
2068: * 64-bit types on this platform.
2069: */
2070: void write_longint(int f, int64 x)
2071: {
2072: char b[12], * const s = b+4;
2073:
2074: SIVAL(s, 0, x);
2075: if (x <= 0x7FFFFFFF && x >= 0) {
2076: write_buf(f, s, 4);
2077: return;
2078: }
2079:
2080: #if SIZEOF_INT64 < 8
2081: rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
2082: exit_cleanup(RERR_UNSUPPORTED);
2083: #else
2084: memset(b, 0xFF, 4);
2085: SIVAL(s, 4, x >> 32);
2086: write_buf(f, b, 12);
2087: #endif
2088: }
2089:
2090: void write_bigbuf(int f, const char *buf, size_t len)
2091: {
2092: size_t half_max = (iobuf.out.size - iobuf.out_empty_len) / 2;
2093:
2094: while (len > half_max + 1024) {
2095: write_buf(f, buf, half_max);
2096: buf += half_max;
2097: len -= half_max;
2098: }
2099:
2100: write_buf(f, buf, len);
2101: }
2102:
2103: void write_buf(int f, const char *buf, size_t len)
2104: {
2105: size_t pos, siz;
2106:
2107: if (f != iobuf.out_fd) {
2108: safe_write(f, buf, len);
2109: goto batch_copy;
2110: }
2111:
2112: if (iobuf.out.len + len > iobuf.out.size)
2113: perform_io(len, PIO_NEED_OUTROOM);
2114:
2115: pos = iobuf.out.pos + iobuf.out.len; /* Must be set after any flushing. */
2116: if (pos >= iobuf.out.size)
2117: pos -= iobuf.out.size;
2118:
2119: /* Handle a split copy if we wrap around the end of the circular buffer. */
2120: if (pos >= iobuf.out.pos && (siz = iobuf.out.size - pos) < len) {
2121: memcpy(iobuf.out.buf + pos, buf, siz);
2122: memcpy(iobuf.out.buf, buf + siz, len - siz);
2123: } else
2124: memcpy(iobuf.out.buf + pos, buf, len);
2125:
2126: iobuf.out.len += len;
2127: total_data_written += len;
2128:
2129: batch_copy:
2130: if (f == write_batch_monitor_out)
2131: safe_write(batch_fd, buf, len);
2132: }
2133:
2134: /* Write a string to the connection */
2135: void write_sbuf(int f, const char *buf)
2136: {
2137: write_buf(f, buf, strlen(buf));
2138: }
2139:
2140: void write_byte(int f, uchar c)
2141: {
2142: write_buf(f, (char *)&c, 1);
2143: }
2144:
2145: void write_vstring(int f, const char *str, int len)
2146: {
2147: uchar lenbuf[3], *lb = lenbuf;
2148:
2149: if (len > 0x7F) {
2150: if (len > 0x7FFF) {
2151: rprintf(FERROR,
2152: "attempting to send over-long vstring (%d > %d)\n",
2153: len, 0x7FFF);
2154: exit_cleanup(RERR_PROTOCOL);
2155: }
2156: *lb++ = len / 0x100 + 0x80;
2157: }
2158: *lb = len;
2159:
2160: write_buf(f, (char*)lenbuf, lb - lenbuf + 1);
2161: if (len)
2162: write_buf(f, str, len);
2163: }
2164:
2165: /* Send a file-list index using a byte-reduction method. */
2166: void write_ndx(int f, int32 ndx)
2167: {
2168: static int32 prev_positive = -1, prev_negative = 1;
2169: int32 diff, cnt = 0;
2170: char b[6];
2171:
2172: if (protocol_version < 30 || read_batch) {
2173: write_int(f, ndx);
2174: return;
2175: }
2176:
2177: /* Send NDX_DONE as a single-byte 0 with no side effects. Send
2178: * negative nums as a positive after sending a leading 0xFF. */
2179: if (ndx >= 0) {
2180: diff = ndx - prev_positive;
2181: prev_positive = ndx;
2182: } else if (ndx == NDX_DONE) {
2183: *b = 0;
2184: write_buf(f, b, 1);
2185: return;
2186: } else {
2187: b[cnt++] = (char)0xFF;
2188: ndx = -ndx;
2189: diff = ndx - prev_negative;
2190: prev_negative = ndx;
2191: }
2192:
2193: /* A diff of 1 - 253 is sent as a one-byte diff; a diff of 254 - 32767
2194: * or 0 is sent as a 0xFE + a two-byte diff; otherwise we send 0xFE
2195: * & all 4 bytes of the (non-negative) num with the high-bit set. */
2196: if (diff < 0xFE && diff > 0)
2197: b[cnt++] = (char)diff;
2198: else if (diff < 0 || diff > 0x7FFF) {
2199: b[cnt++] = (char)0xFE;
2200: b[cnt++] = (char)((ndx >> 24) | 0x80);
2201: b[cnt++] = (char)ndx;
2202: b[cnt++] = (char)(ndx >> 8);
2203: b[cnt++] = (char)(ndx >> 16);
2204: } else {
2205: b[cnt++] = (char)0xFE;
2206: b[cnt++] = (char)(diff >> 8);
2207: b[cnt++] = (char)diff;
2208: }
2209: write_buf(f, b, cnt);
2210: }
2211:
2212: /* Receive a file-list index using a byte-reduction method. */
2213: int32 read_ndx(int f)
2214: {
2215: static int32 prev_positive = -1, prev_negative = 1;
2216: int32 *prev_ptr, num;
2217: char b[4];
2218:
2219: if (protocol_version < 30)
2220: return read_int(f);
2221:
2222: read_buf(f, b, 1);
2223: if (CVAL(b, 0) == 0xFF) {
2224: read_buf(f, b, 1);
2225: prev_ptr = &prev_negative;
2226: } else if (CVAL(b, 0) == 0)
2227: return NDX_DONE;
2228: else
2229: prev_ptr = &prev_positive;
2230: if (CVAL(b, 0) == 0xFE) {
2231: read_buf(f, b, 2);
2232: if (CVAL(b, 0) & 0x80) {
2233: b[3] = CVAL(b, 0) & ~0x80;
2234: b[0] = b[1];
2235: read_buf(f, b+1, 2);
2236: num = IVAL(b, 0);
2237: } else
2238: num = (UVAL(b,0)<<8) + UVAL(b,1) + *prev_ptr;
2239: } else
2240: num = UVAL(b, 0) + *prev_ptr;
2241: *prev_ptr = num;
2242: if (prev_ptr == &prev_negative)
2243: num = -num;
2244: return num;
2245: }
2246:
2247: /* Read a line of up to bufsiz-1 characters into buf. Strips
2248: * the (required) trailing newline and all carriage returns.
2249: * Returns 1 for success; 0 for I/O error or truncation. */
2250: int read_line_old(int fd, char *buf, size_t bufsiz, int eof_ok)
2251: {
2252: assert(fd != iobuf.in_fd);
2253: bufsiz--; /* leave room for the null */
2254: while (bufsiz > 0) {
2255: if (safe_read(fd, buf, 1) == 0) {
2256: if (eof_ok)
2257: break;
2258: return 0;
2259: }
2260: if (*buf == '\0')
2261: return 0;
2262: if (*buf == '\n')
2263: break;
2264: if (*buf != '\r') {
2265: buf++;
2266: bufsiz--;
2267: }
2268: }
2269: *buf = '\0';
2270: return bufsiz > 0;
2271: }
2272:
2273: void io_printf(int fd, const char *format, ...)
2274: {
2275: va_list ap;
2276: char buf[BIGPATHBUFLEN];
2277: int len;
2278:
2279: va_start(ap, format);
2280: len = vsnprintf(buf, sizeof buf, format, ap);
2281: va_end(ap);
2282:
2283: if (len < 0)
2284: exit_cleanup(RERR_PROTOCOL);
2285:
2286: if (len >= (int)sizeof buf) {
2287: rprintf(FERROR, "io_printf() was too long for the buffer.\n");
2288: exit_cleanup(RERR_PROTOCOL);
2289: }
2290:
2291: write_sbuf(fd, buf);
2292: }
2293:
2294: /* Setup for multiplexing a MSG_* stream with the data stream. */
2295: void io_start_multiplex_out(int fd)
2296: {
2297: io_flush(FULL_FLUSH);
2298:
2299: if (msgs2stderr && DEBUG_GTE(IO, 2))
2300: rprintf(FINFO, "[%s] io_start_multiplex_out(%d)\n", who_am_i(), fd);
2301:
2302: if (!iobuf.msg.buf)
2303: alloc_xbuf(&iobuf.msg, ROUND_UP_1024(IO_BUFFER_SIZE));
2304:
2305: iobuf.out_empty_len = 4; /* See also OUT_MULTIPLEXED */
2306: io_start_buffering_out(fd);
2307: got_kill_signal = 0;
2308:
2309: iobuf.raw_data_header_pos = iobuf.out.pos + iobuf.out.len;
2310: iobuf.out.len += 4;
2311: }
2312:
2313: /* Setup for multiplexing a MSG_* stream with the data stream. */
2314: void io_start_multiplex_in(int fd)
2315: {
2316: if (msgs2stderr && DEBUG_GTE(IO, 2))
2317: rprintf(FINFO, "[%s] io_start_multiplex_in(%d)\n", who_am_i(), fd);
2318:
2319: iobuf.in_multiplexed = 1; /* See also IN_MULTIPLEXED */
2320: io_start_buffering_in(fd);
2321: }
2322:
2323: int io_end_multiplex_in(int mode)
2324: {
2325: int ret = iobuf.in_multiplexed ? iobuf.in_fd : -1;
2326:
2327: if (msgs2stderr && DEBUG_GTE(IO, 2))
2328: rprintf(FINFO, "[%s] io_end_multiplex_in(mode=%d)\n", who_am_i(), mode);
2329:
2330: iobuf.in_multiplexed = 0;
2331: if (mode == MPLX_SWITCHING)
2332: iobuf.raw_input_ends_before = 0;
2333: else
2334: assert(iobuf.raw_input_ends_before == 0);
2335: if (mode != MPLX_TO_BUFFERED)
2336: io_end_buffering_in(mode);
2337:
2338: return ret;
2339: }
2340:
2341: int io_end_multiplex_out(int mode)
2342: {
2343: int ret = iobuf.out_empty_len ? iobuf.out_fd : -1;
2344:
2345: if (msgs2stderr && DEBUG_GTE(IO, 2))
2346: rprintf(FINFO, "[%s] io_end_multiplex_out(mode=%d)\n", who_am_i(), mode);
2347:
2348: if (mode != MPLX_TO_BUFFERED)
2349: io_end_buffering_out(mode);
2350: else
2351: io_flush(FULL_FLUSH);
2352:
2353: iobuf.out.len = 0;
2354: iobuf.out_empty_len = 0;
2355: if (got_kill_signal > 0) /* Just in case... */
2356: handle_kill_signal(False);
2357: got_kill_signal = -1;
2358:
2359: return ret;
2360: }
2361:
2362: void start_write_batch(int fd)
2363: {
2364: /* Some communication has already taken place, but we don't
2365: * enable batch writing until here so that we can write a
2366: * canonical record of the communication even though the
2367: * actual communication so far depends on whether a daemon
2368: * is involved. */
2369: write_int(batch_fd, protocol_version);
2370: if (protocol_version >= 30)
2371: write_byte(batch_fd, compat_flags);
2372: write_int(batch_fd, checksum_seed);
2373:
2374: if (am_sender)
2375: write_batch_monitor_out = fd;
2376: else
2377: write_batch_monitor_in = fd;
2378: }
2379:
2380: void stop_write_batch(void)
2381: {
2382: write_batch_monitor_out = -1;
2383: write_batch_monitor_in = -1;
2384: }
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