1: /*
2: * Compatibility routines for older rsync protocol versions.
3: *
4: * Copyright (C) Andrew Tridgell 1996
5: * Copyright (C) Paul Mackerras 1996
6: * Copyright (C) 2004-2020 Wayne Davison
7: *
8: * This program is free software; you can redistribute it and/or modify
9: * it under the terms of the GNU General Public License as published by
10: * the Free Software Foundation; either version 3 of the License, or
11: * (at your option) any later version.
12: *
13: * This program is distributed in the hope that it will be useful,
14: * but WITHOUT ANY WARRANTY; without even the implied warranty of
15: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16: * GNU General Public License for more details.
17: *
18: * You should have received a copy of the GNU General Public License along
19: * with this program; if not, visit the http://fsf.org website.
20: */
21:
22: #include "rsync.h"
23: #include "itypes.h"
24:
25: extern int am_server;
26: extern int am_sender;
27: extern int local_server;
28: extern int inplace;
29: extern int recurse;
30: extern int use_qsort;
31: extern int allow_inc_recurse;
32: extern int preallocate_files;
33: extern int append_mode;
34: extern int fuzzy_basis;
35: extern int read_batch;
36: extern int write_batch;
37: extern int delay_updates;
38: extern int checksum_seed;
39: extern int basis_dir_cnt;
40: extern int prune_empty_dirs;
41: extern int protocol_version;
42: extern int detect_renamed;
43: extern int protect_args;
44: extern int preserve_uid;
45: extern int preserve_gid;
46: extern int preserve_atimes;
47: extern int preserve_crtimes;
48: extern int preserve_acls;
49: extern int preserve_xattrs;
50: extern int preserve_fileflags;
51: extern int xfer_flags_as_varint;
52: extern int need_messages_from_generator;
53: extern int delete_mode, delete_before, delete_during, delete_after;
54: extern int do_compression;
55: extern int do_compression_level;
56: extern char *shell_cmd;
57: extern char *partial_dir;
58: extern char *files_from;
59: extern char *filesfrom_host;
60: extern const char *checksum_choice;
61: extern const char *compress_choice;
62: extern filter_rule_list filter_list;
63: extern int need_unsorted_flist;
64: #ifdef ICONV_OPTION
65: extern iconv_t ic_send, ic_recv;
66: extern char *iconv_opt;
67: #endif
68: extern struct name_num_obj valid_checksums;
69:
70: int remote_protocol = 0;
71: int file_extra_cnt = 0; /* count of file-list extras that everyone gets */
72: int inc_recurse = 0;
73: int compat_flags = 0;
74: int use_safe_inc_flist = 0;
75: int want_xattr_optim = 0;
76: int proper_seed_order = 0;
77: int inplace_partial = 0;
78: int do_negotiated_strings = 0;
79: int xmit_id0_names = 0;
80:
81: /* These index values are for the file-list's extra-attribute array. */
82: int pathname_ndx, depth_ndx, atimes_ndx, crtimes_ndx, uid_ndx, gid_ndx, fileflags_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
83:
84: int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
85: int sender_symlink_iconv = 0; /* sender should convert symlink content */
86:
87: #ifdef ICONV_OPTION
88: int filesfrom_convert = 0;
89: #endif
90:
91: #define MAX_NSTR_STRLEN 256
92:
93: struct name_num_obj valid_compressions = {
94: "compress", NULL, NULL, 0, 0, {
95: #ifdef SUPPORT_ZSTD
96: { CPRES_ZSTD, "zstd", NULL },
97: #endif
98: #ifdef SUPPORT_LZ4
99: { CPRES_LZ4, "lz4", NULL },
100: #endif
101: { CPRES_ZLIBX, "zlibx", NULL },
102: { CPRES_ZLIB, "zlib", NULL },
103: { CPRES_NONE, "none", NULL },
104: { 0, NULL, NULL }
105: }
106: };
107:
108: #define CF_INC_RECURSE (1<<0)
109: #define CF_SYMLINK_TIMES (1<<1)
110: #define CF_SYMLINK_ICONV (1<<2)
111: #define CF_SAFE_FLIST (1<<3)
112: #define CF_AVOID_XATTR_OPTIM (1<<4)
113: #define CF_CHKSUM_SEED_FIX (1<<5)
114: #define CF_INPLACE_PARTIAL_DIR (1<<6)
115: #define CF_VARINT_FLIST_FLAGS (1<<7)
116: #define CF_ID0_NAMES (1<<8)
117:
118: static const char *client_info;
119:
120: /* The server makes sure that if either side only supports a pre-release
121: * version of a protocol, that both sides must speak a compatible version
122: * of that protocol for it to be advertised as available. */
123: static void check_sub_protocol(void)
124: {
125: char *dot;
126: int their_protocol, their_sub;
127: #if SUBPROTOCOL_VERSION != 0
128: int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
129: #else
130: int our_sub = 0;
131: #endif
132:
133: /* client_info starts with VER.SUB string if client is a pre-release. */
134: if (!(their_protocol = atoi(client_info))
135: || !(dot = strchr(client_info, '.'))
136: || !(their_sub = atoi(dot+1))) {
137: #if SUBPROTOCOL_VERSION != 0
138: if (our_sub)
139: protocol_version--;
140: #endif
141: return;
142: }
143:
144: if (their_protocol < protocol_version) {
145: if (their_sub)
146: protocol_version = their_protocol - 1;
147: return;
148: }
149:
150: if (their_protocol > protocol_version)
151: their_sub = 0; /* 0 == final version of older protocol */
152: if (their_sub != our_sub)
153: protocol_version--;
154: }
155:
156: void set_allow_inc_recurse(void)
157: {
158: client_info = shell_cmd ? shell_cmd : "";
159:
160: if (!recurse || use_qsort)
161: allow_inc_recurse = 0;
162: else if (!am_sender
163: && (delete_before || delete_after
164: || detect_renamed
165: || delay_updates || prune_empty_dirs))
166: allow_inc_recurse = 0;
167: else if (am_server && !local_server
168: && (strchr(client_info, 'i') == NULL))
169: allow_inc_recurse = 0;
170: }
171:
172: void parse_compress_choice(int final_call)
173: {
174: if (valid_compressions.negotiated_name)
175: do_compression = valid_compressions.negotiated_num;
176: else if (compress_choice) {
177: struct name_num_item *nni = get_nni_by_name(&valid_compressions, compress_choice, -1);
178: if (!nni) {
179: rprintf(FERROR, "unknown compress name: %s\n", compress_choice);
180: exit_cleanup(RERR_UNSUPPORTED);
181: }
182: do_compression = nni->num;
183: if (am_server)
184: validate_choice_vs_env(NSTR_COMPRESS, do_compression, -1);
185: } else if (do_compression)
186: do_compression = CPRES_ZLIB;
187: else
188: do_compression = CPRES_NONE;
189:
190: if (do_compression != CPRES_NONE && final_call)
191: init_compression_level(); /* There's a chance this might turn compression off! */
192:
193: if (do_compression == CPRES_NONE)
194: compress_choice = NULL;
195:
196: /* Snag the compression name for both write_batch's option output & the following debug output. */
197: if (valid_compressions.negotiated_name)
198: compress_choice = valid_compressions.negotiated_name;
199: else if (compress_choice == NULL) {
200: struct name_num_item *nni = get_nni_by_num(&valid_compressions, do_compression);
201: compress_choice = nni ? nni->name : "UNKNOWN";
202: }
203:
204: if (final_call && DEBUG_GTE(NSTR, am_server ? 3 : 1)
205: && (do_compression != CPRES_NONE || do_compression_level != CLVL_NOT_SPECIFIED)) {
206: rprintf(FINFO, "%s%s compress: %s (level %d)\n",
207: am_server ? "Server" : "Client",
208: valid_compressions.negotiated_name ? " negotiated" : "",
209: compress_choice, do_compression_level);
210: }
211: }
212:
213: struct name_num_item *get_nni_by_name(struct name_num_obj *nno, const char *name, int len)
214: {
215: struct name_num_item *nni;
216:
217: if (len < 0)
218: len = strlen(name);
219:
220: for (nni = nno->list; nni->name; nni++) {
221: if (strncasecmp(name, nni->name, len) == 0 && nni->name[len] == '\0')
222: return nni;
223: }
224:
225: return NULL;
226: }
227:
228: struct name_num_item *get_nni_by_num(struct name_num_obj *nno, int num)
229: {
230: struct name_num_item *nni;
231:
232: for (nni = nno->list; nni->name; nni++) {
233: if (num == nni->num)
234: return nni;
235: }
236:
237: return NULL;
238: }
239:
240: static void init_nno_saw(struct name_num_obj *nno, int val)
241: {
242: struct name_num_item *nni;
243: int cnt;
244:
245: if (!nno->saw_len) {
246: for (nni = nno->list; nni->name; nni++) {
247: if (nni->num >= nno->saw_len)
248: nno->saw_len = nni->num + 1;
249: }
250: }
251:
252: if (!nno->saw) {
253: nno->saw = new_array0(uchar, nno->saw_len);
254:
255: /* We'll take this opportunity to make sure that the main_name values are set right. */
256: for (cnt = 1, nni = nno->list; nni->name; nni++, cnt++) {
257: if (nno->saw[nni->num])
258: nni->main_name = nno->list[nno->saw[nni->num]-1].name;
259: else
260: nno->saw[nni->num] = cnt;
261: }
262: }
263:
264: memset(nno->saw, val, nno->saw_len);
265: }
266:
267: /* Simplify the user-provided string so that it contains valid names without any duplicates.
268: * It also sets the "saw" flags to a 1-relative count of which name was seen first. */
269: static int parse_nni_str(struct name_num_obj *nno, const char *from, char *tobuf, int tobuf_len)
270: {
271: char *to = tobuf, *tok = NULL;
272: int saw_tok = 0, cnt = 0;
273:
274: while (1) {
275: int at_space = isSpace(from);
276: char ch = *from++;
277: if (ch == '&')
278: ch = '\0';
279: if (!ch || at_space) {
280: if (tok) {
281: struct name_num_item *nni = get_nni_by_name(nno, tok, to - tok);
282: if (nni && !nno->saw[nni->num]) {
283: nno->saw[nni->num] = ++cnt;
284: if (nni->main_name) {
285: to = tok + strlcpy(tok, nni->main_name, tobuf_len - (tok - tobuf));
286: if (to - tobuf >= tobuf_len) {
287: to = tok - 1;
288: break;
289: }
290: }
291: } else
292: to = tok - (tok != tobuf);
293: saw_tok = 1;
294: tok = NULL;
295: }
296: if (!ch)
297: break;
298: continue;
299: }
300: if (!tok) {
301: if (to != tobuf)
302: *to++ = ' ';
303: tok = to;
304: }
305: if (to - tobuf >= tobuf_len - 1) {
306: to = tok - (tok != tobuf);
307: break;
308: }
309: *to++ = ch;
310: }
311: *to = '\0';
312:
313: if (saw_tok && to == tobuf)
314: return strlcpy(tobuf, "INVALID", MAX_NSTR_STRLEN);
315:
316: return to - tobuf;
317: }
318:
319: /* This routine is always called with a tmpbuf of MAX_NSTR_STRLEN length, but the
320: * buffer may be pre-populated with a "len" length string to use OR a len of -1
321: * to tell us to read a string from the fd. */
322: static void recv_negotiate_str(int f_in, struct name_num_obj *nno, char *tmpbuf, int len)
323: {
324: struct name_num_item *ret = NULL;
325:
326: if (len < 0)
327: len = read_vstring(f_in, tmpbuf, MAX_NSTR_STRLEN);
328:
329: if (DEBUG_GTE(NSTR, am_server ? 3 : 2)) {
330: if (am_server)
331: rprintf(FINFO, "Client %s list (on server): %s\n", nno->type, tmpbuf);
332: else
333: rprintf(FINFO, "Server %s list (on client): %s\n", nno->type, tmpbuf);
334: }
335:
336: if (len > 0) {
337: struct name_num_item *nni;
338: int best = nno->saw_len; /* We want best == 1 from the client list, so start with a big number. */
339: char *space, *tok = tmpbuf;
340: while (tok) {
341: while (*tok == ' ') tok++; /* Should be unneeded... */
342: if (!*tok)
343: break;
344: if ((space = strchr(tok, ' ')) != NULL)
345: *space = '\0';
346: nni = get_nni_by_name(nno, tok, -1);
347: if (space) {
348: *space = ' ';
349: tok = space + 1;
350: } else
351: tok = NULL;
352: if (!nni || !nno->saw[nni->num] || best <= nno->saw[nni->num])
353: continue;
354: ret = nni;
355: best = nno->saw[nni->num];
356: if (best == 1 || am_server) /* The server side stops at the first acceptable client choice */
357: break;
358: }
359: if (ret) {
360: free(nno->saw);
361: nno->saw = NULL;
362: nno->negotiated_name = ret->main_name ? ret->main_name : ret->name;
363: nno->negotiated_num = ret->num;
364: return;
365: }
366: }
367:
368: if (!am_server || !do_negotiated_strings) {
369: char *cp = tmpbuf;
370: int j;
371: rprintf(FERROR, "Failed to negotiate a %s choice.\n", nno->type);
372: rprintf(FERROR, "%s list: %s\n", am_server ? "Client" : "Server", tmpbuf);
373: /* Recreate our original list from the saw values. This can't overflow our huge
374: * buffer because we don't have enough valid entries to get anywhere close. */
375: for (j = 1, *cp = '\0'; j <= nno->saw_len; j++) {
376: struct name_num_item *nni;
377: for (nni = nno->list; nni->name; nni++) {
378: if (nno->saw[nni->num] == j) {
379: *cp++ = ' ';
380: cp += strlcpy(cp, nni->name, MAX_NSTR_STRLEN - (cp - tmpbuf));
381: break;
382: }
383: }
384: }
385: if (!*tmpbuf)
386: strlcpy(cp, " INVALID", MAX_NSTR_STRLEN);
387: rprintf(FERROR, "%s list:%s\n", am_server ? "Server" : "Client", tmpbuf);
388: }
389:
390: exit_cleanup(RERR_UNSUPPORTED);
391: }
392:
393: static const char *getenv_nstr(int ntype)
394: {
395: const char *env_str = getenv(ntype == NSTR_COMPRESS ? "RSYNC_COMPRESS_LIST" : "RSYNC_CHECKSUM_LIST");
396:
397: /* When writing a batch file, we always negotiate an old-style choice. */
398: if (write_batch)
399: env_str = ntype == NSTR_COMPRESS ? "zlib" : protocol_version >= 30 ? "md5" : "md4";
400:
401: if (am_server && env_str) {
402: char *cp = strchr(env_str, '&');
403: if (cp)
404: env_str = cp + 1;
405: }
406:
407: return env_str;
408: }
409:
410: void validate_choice_vs_env(int ntype, int num1, int num2)
411: {
412: struct name_num_obj *nno = ntype == NSTR_COMPRESS ? &valid_compressions : &valid_checksums;
413: const char *list_str = getenv_nstr(ntype);
414: char tmpbuf[MAX_NSTR_STRLEN];
415:
416: if (!list_str)
417: return;
418:
419: while (isSpace(list_str)) list_str++;
420:
421: if (!*list_str)
422: return;
423:
424: init_nno_saw(nno, 0);
425: parse_nni_str(nno, list_str, tmpbuf, MAX_NSTR_STRLEN);
426:
427: if (ntype == NSTR_CHECKSUM) /* If "md4" is in the env list, all the old MD4 choices are OK too. */
428: nno->saw[CSUM_MD4_ARCHAIC] = nno->saw[CSUM_MD4_BUSTED] = nno->saw[CSUM_MD4_OLD] = nno->saw[CSUM_MD4];
429:
430: if (!nno->saw[num1] || (num2 >= 0 && !nno->saw[num2])) {
431: rprintf(FERROR, "Your --%s-choice value (%s) was refused by the server.\n",
432: ntype == NSTR_COMPRESS ? "compress" : "checksum",
433: ntype == NSTR_COMPRESS ? compress_choice : checksum_choice);
434: exit_cleanup(RERR_UNSUPPORTED);
435: }
436:
437: free(nno->saw);
438: nno->saw = NULL;
439: }
440:
441: /* The saw buffer is initialized and used to store ordinal values from 1 to N
442: * for the order of the args in the array. If dup_markup == '\0', duplicates
443: * are removed otherwise the char is prefixed to the duplicate term and, if it
444: * is an opening paren/bracket/brace, the matching closing char is suffixed.
445: * "none" is removed on the client side unless dup_markup != '\0'. */
446: int get_default_nno_list(struct name_num_obj *nno, char *to_buf, int to_buf_len, char dup_markup)
447: {
448: struct name_num_item *nni;
449: int len = 0, cnt = 0;
450: char delim = '\0', post_delim;
451:
452: switch (dup_markup) {
453: case '(': post_delim = ')'; break;
454: case '[': post_delim = ']'; break;
455: case '{': post_delim = '}'; break;
456: default: post_delim = '\0'; break;
457: }
458:
459: init_nno_saw(nno, 0);
460:
461: for (nni = nno->list, len = 0; nni->name; nni++) {
462: if (nni->main_name) {
463: if (!dup_markup)
464: continue;
465: delim = dup_markup;
466: }
467: if (nni->num == 0 && !am_server && !dup_markup)
468: continue;
469: if (len)
470: to_buf[len++]= ' ';
471: if (delim) {
472: to_buf[len++]= delim;
473: delim = post_delim;
474: }
475: len += strlcpy(to_buf+len, nni->name, to_buf_len - len);
476: if (len >= to_buf_len - 3)
477: exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE... */
478: if (delim) {
479: to_buf[len++]= delim;
480: delim = '\0';
481: }
482: nno->saw[nni->num] = ++cnt;
483: }
484:
485: return len;
486: }
487:
488: static void send_negotiate_str(int f_out, struct name_num_obj *nno, int ntype)
489: {
490: char tmpbuf[MAX_NSTR_STRLEN];
491: const char *list_str = getenv_nstr(ntype);
492: int len;
493:
494: if (list_str && *list_str) {
495: init_nno_saw(nno, 0);
496: len = parse_nni_str(nno, list_str, tmpbuf, MAX_NSTR_STRLEN);
497: list_str = tmpbuf;
498: } else
499: list_str = NULL;
500:
501: if (!list_str || !*list_str)
502: len = get_default_nno_list(nno, tmpbuf, MAX_NSTR_STRLEN, '\0');
503:
504: if (DEBUG_GTE(NSTR, am_server ? 3 : 2)) {
505: if (am_server)
506: rprintf(FINFO, "Server %s list (on server): %s\n", nno->type, tmpbuf);
507: else
508: rprintf(FINFO, "Client %s list (on client): %s\n", nno->type, tmpbuf);
509: }
510:
511: /* Each side sends their list of valid names to the other side and then both sides
512: * pick the first name in the client's list that is also in the server's list. */
513: if (do_negotiated_strings)
514: write_vstring(f_out, tmpbuf, len);
515: }
516:
517: static void negotiate_the_strings(int f_in, int f_out)
518: {
519: /* We send all the negotiation strings before we start to read them to help avoid a slow startup. */
520:
521: if (!checksum_choice)
522: send_negotiate_str(f_out, &valid_checksums, NSTR_CHECKSUM);
523:
524: if (do_compression && !compress_choice)
525: send_negotiate_str(f_out, &valid_compressions, NSTR_COMPRESS);
526:
527: if (valid_checksums.saw) {
528: char tmpbuf[MAX_NSTR_STRLEN];
529: int len;
530: if (do_negotiated_strings)
531: len = -1;
532: else
533: len = strlcpy(tmpbuf, protocol_version >= 30 ? "md5" : "md4", MAX_NSTR_STRLEN);
534: recv_negotiate_str(f_in, &valid_checksums, tmpbuf, len);
535: }
536:
537: if (valid_compressions.saw) {
538: char tmpbuf[MAX_NSTR_STRLEN];
539: int len;
540: if (do_negotiated_strings)
541: len = -1;
542: else
543: len = strlcpy(tmpbuf, "zlib", MAX_NSTR_STRLEN);
544: recv_negotiate_str(f_in, &valid_compressions, tmpbuf, len);
545: }
546:
547: /* If the other side is too old to negotiate, the above steps just made sure that
548: * the env didn't disallow the old algorithm. Mark things as non-negotiated. */
549: if (!do_negotiated_strings)
550: valid_checksums.negotiated_name = valid_compressions.negotiated_name = NULL;
551: }
552:
553: void setup_protocol(int f_out,int f_in)
554: {
555: assert(file_extra_cnt == 0);
556: assert(EXTRA64_CNT == 2 || EXTRA64_CNT == 1);
557:
558: /* All int64 values must be set first so that they are guaranteed to be
559: * aligned for direct int64-pointer memory access. */
560: if (preserve_atimes)
561: atimes_ndx = (file_extra_cnt += EXTRA64_CNT);
562: if (preserve_crtimes)
563: crtimes_ndx = (file_extra_cnt += EXTRA64_CNT);
564: if (am_sender) /* This is most likely in the in64 union as well. */
565: pathname_ndx = (file_extra_cnt += PTR_EXTRA_CNT);
566: else
567: depth_ndx = ++file_extra_cnt;
568: if (preserve_uid)
569: uid_ndx = ++file_extra_cnt;
570: if (preserve_gid)
571: gid_ndx = ++file_extra_cnt;
572: if (preserve_fileflags || (force_change && !am_sender))
573: fileflags_ndx = ++file_extra_cnt;
574: if (preserve_acls && !am_sender)
575: acls_ndx = ++file_extra_cnt;
576: if (preserve_xattrs)
577: xattrs_ndx = ++file_extra_cnt;
578:
579: if (am_server)
580: set_allow_inc_recurse();
581:
582: if (remote_protocol == 0) {
583: if (am_server && !local_server)
584: check_sub_protocol();
585: if (!read_batch)
586: write_int(f_out, protocol_version);
587: remote_protocol = read_int(f_in);
588: if (protocol_version > remote_protocol)
589: protocol_version = remote_protocol;
590: }
591: if (read_batch && remote_protocol > protocol_version) {
592: rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
593: remote_protocol, protocol_version);
594: exit_cleanup(RERR_PROTOCOL);
595: }
596:
597: if (DEBUG_GTE(PROTO, 1)) {
598: rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
599: am_server? "Server" : "Client", remote_protocol, protocol_version);
600: }
601: if (remote_protocol < MIN_PROTOCOL_VERSION
602: || remote_protocol > MAX_PROTOCOL_VERSION) {
603: rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
604: rprintf(FERROR,"(see the rsync man page for an explanation)\n");
605: exit_cleanup(RERR_PROTOCOL);
606: }
607: if (remote_protocol < OLD_PROTOCOL_VERSION) {
608: rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
609: am_server? "Client" : "Server");
610: }
611: if (protocol_version < MIN_PROTOCOL_VERSION) {
612: rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
613: MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
614: exit_cleanup(RERR_PROTOCOL);
615: }
616: if (protocol_version > PROTOCOL_VERSION) {
617: rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
618: PROTOCOL_VERSION, am_server? "Server" : "Client");
619: exit_cleanup(RERR_PROTOCOL);
620: }
621: if (read_batch)
622: check_batch_flags();
623:
624: #ifndef SUPPORT_PREALLOCATION
625: if (preallocate_files && !am_sender) {
626: rprintf(FERROR, "preallocation is not supported on this %s\n",
627: am_server ? "Server" : "Client");
628: exit_cleanup(RERR_SYNTAX);
629: }
630: #endif
631:
632: if (protocol_version < 30) {
633: if (append_mode == 1)
634: append_mode = 2;
635: if (preserve_acls && !local_server) {
636: rprintf(FERROR,
637: "--acls requires protocol 30 or higher"
638: " (negotiated %d).\n",
639: protocol_version);
640: exit_cleanup(RERR_PROTOCOL);
641: }
642: if (preserve_xattrs && !local_server) {
643: rprintf(FERROR,
644: "--xattrs requires protocol 30 or higher"
645: " (negotiated %d).\n",
646: protocol_version);
647: exit_cleanup(RERR_PROTOCOL);
648: }
649: }
650:
651: if (delete_mode && !(delete_before+delete_during+delete_after)) {
652: if (protocol_version < 30)
653: delete_before = 1;
654: else
655: delete_during = 1;
656: }
657:
658: if (protocol_version < 29) {
659: if (fuzzy_basis) {
660: rprintf(FERROR,
661: "--fuzzy requires protocol 29 or higher"
662: " (negotiated %d).\n",
663: protocol_version);
664: exit_cleanup(RERR_PROTOCOL);
665: }
666:
667: if (basis_dir_cnt && inplace) {
668: rprintf(FERROR,
669: "%s with --inplace requires protocol 29 or higher"
670: " (negotiated %d).\n",
671: alt_dest_opt(0), protocol_version);
672: exit_cleanup(RERR_PROTOCOL);
673: }
674:
675: if (basis_dir_cnt > 1) {
676: rprintf(FERROR,
677: "Using more than one %s option requires protocol"
678: " 29 or higher (negotiated %d).\n",
679: alt_dest_opt(0), protocol_version);
680: exit_cleanup(RERR_PROTOCOL);
681: }
682:
683: if (prune_empty_dirs) {
684: rprintf(FERROR,
685: "--prune-empty-dirs requires protocol 29 or higher"
686: " (negotiated %d).\n",
687: protocol_version);
688: exit_cleanup(RERR_PROTOCOL);
689: }
690: } else if (protocol_version >= 30) {
691: if (am_server) {
692: compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
693: #ifdef CAN_SET_SYMLINK_TIMES
694: compat_flags |= CF_SYMLINK_TIMES;
695: #endif
696: #ifdef ICONV_OPTION
697: compat_flags |= CF_SYMLINK_ICONV;
698: #endif
699: if (local_server || strchr(client_info, 'f') != NULL)
700: compat_flags |= CF_SAFE_FLIST;
701: if (local_server || strchr(client_info, 'x') != NULL)
702: compat_flags |= CF_AVOID_XATTR_OPTIM;
703: if (local_server || strchr(client_info, 'C') != NULL)
704: compat_flags |= CF_CHKSUM_SEED_FIX;
705: if (local_server || strchr(client_info, 'I') != NULL)
706: compat_flags |= CF_INPLACE_PARTIAL_DIR;
707: if (local_server || strchr(client_info, 'u') != NULL)
708: compat_flags |= CF_ID0_NAMES;
709: if (local_server || strchr(client_info, 'v') != NULL) {
710: do_negotiated_strings = 1;
711: compat_flags |= CF_VARINT_FLIST_FLAGS;
712: }
713: if (strchr(client_info, 'V') != NULL) { /* Support a pre-release 'V' that got superseded */
714: if (!write_batch)
715: compat_flags |= CF_VARINT_FLIST_FLAGS;
716: write_byte(f_out, compat_flags);
717: } else
718: write_varint(f_out, compat_flags);
719: } else { /* read_varint() is compatible with the older write_byte() when the 0x80 bit isn't on. */
720: compat_flags = read_varint(f_in);
721: if (compat_flags & CF_VARINT_FLIST_FLAGS)
722: do_negotiated_strings = 1;
723: }
724: /* The inc_recurse var MUST be set to 0 or 1. */
725: inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
726: want_xattr_optim = protocol_version >= 31 && !(compat_flags & CF_AVOID_XATTR_OPTIM);
727: proper_seed_order = compat_flags & CF_CHKSUM_SEED_FIX ? 1 : 0;
728: xfer_flags_as_varint = compat_flags & CF_VARINT_FLIST_FLAGS ? 1 : 0;
729: xmit_id0_names = compat_flags & CF_ID0_NAMES ? 1 : 0;
730: if (!xfer_flags_as_varint && preserve_crtimes) {
731: fprintf(stderr, "Both rsync versions must be at least 3.2.0 for --crtimes.\n");
732: exit_cleanup(RERR_PROTOCOL);
733: }
734: if (!xfer_flags_as_varint && preserve_fileflags) {
735: fprintf(stderr, "Both rsync versions must be at least 3.2.0 for --fileflags.\n");
736: exit_cleanup(RERR_PROTOCOL);
737: }
738: if (am_sender) {
739: receiver_symlink_times = am_server
740: ? strchr(client_info, 'L') != NULL
741: : !!(compat_flags & CF_SYMLINK_TIMES);
742: }
743: #ifdef CAN_SET_SYMLINK_TIMES
744: else
745: receiver_symlink_times = 1;
746: #endif
747: #ifdef ICONV_OPTION
748: sender_symlink_iconv = iconv_opt && (am_server
749: ? local_server || strchr(client_info, 's') != NULL
750: : !!(compat_flags & CF_SYMLINK_ICONV));
751: #endif
752: if (inc_recurse && !allow_inc_recurse) {
753: /* This should only be able to happen in a batch. */
754: fprintf(stderr,
755: "Incompatible options specified for inc-recursive %s.\n",
756: read_batch ? "batch file" : "connection");
757: exit_cleanup(RERR_SYNTAX);
758: }
759: use_safe_inc_flist = (compat_flags & CF_SAFE_FLIST) || protocol_version >= 31;
760: need_messages_from_generator = 1;
761: if (compat_flags & CF_INPLACE_PARTIAL_DIR)
762: inplace_partial = 1;
763: #ifdef CAN_SET_SYMLINK_TIMES
764: } else if (!am_sender) {
765: receiver_symlink_times = 1;
766: #endif
767: }
768:
769: if (read_batch)
770: do_negotiated_strings = 0;
771:
772: if (need_unsorted_flist && (!am_sender || inc_recurse))
773: unsort_ndx = ++file_extra_cnt;
774:
775: if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
776: int rflags = FILTRULE_NO_PREFIXES | FILTRULE_DIRECTORY;
777: if (!am_sender || protocol_version >= 30)
778: rflags |= FILTRULE_PERISHABLE;
779: parse_filter_str(&filter_list, partial_dir, rule_template(rflags), 0);
780: }
781:
782:
783: #ifdef ICONV_OPTION
784: if (protect_args && files_from) {
785: if (am_sender)
786: filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
787: else
788: filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
789: }
790: #endif
791:
792: negotiate_the_strings(f_in, f_out);
793:
794: if (am_server) {
795: if (!checksum_seed)
796: checksum_seed = time(NULL) ^ (getpid() << 6);
797: write_int(f_out, checksum_seed);
798: } else {
799: checksum_seed = read_int(f_in);
800: }
801:
802: parse_checksum_choice(1); /* Sets checksum_type & xfersum_type */
803: parse_compress_choice(1); /* Sets do_compression */
804:
805: if (write_batch && !am_server)
806: write_batch_shell_file();
807:
808: init_flist();
809: }
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