2 * Compatibility routines for older rsync protocol versions.
4 * Copyright (C) Andrew Tridgell 1996
5 * Copyright (C) Paul Mackerras 1996
6 * Copyright (C) 2004-2022 Wayne Davison
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.
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.
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.
28 extern int local_server;
32 extern int allow_inc_recurse;
33 extern int preallocate_files;
34 extern int append_mode;
35 extern int fuzzy_basis;
36 extern int read_batch;
37 extern int write_batch;
38 extern int delay_updates;
39 extern int checksum_seed;
40 extern int basis_dir_cnt;
41 extern int prune_empty_dirs;
42 extern int protocol_version;
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 xfer_flags_as_varint;
51 extern int need_messages_from_generator;
52 extern int delete_mode, delete_before, delete_during, delete_after;
53 extern int do_compression;
54 extern int do_compression_level;
55 extern int saw_stderr_opt;
56 extern int msgs2stderr;
57 extern char *shell_cmd;
58 extern char *partial_dir;
59 extern char *files_from;
60 extern char *filesfrom_host;
61 extern const char *checksum_choice;
62 extern const char *compress_choice;
63 extern char *daemon_auth_choices;
64 extern filter_rule_list filter_list;
65 extern int need_unsorted_flist;
67 extern iconv_t ic_send, ic_recv;
68 extern char *iconv_opt;
70 extern struct name_num_obj valid_checksums, valid_auth_checksums;
72 extern struct name_num_item *xfer_sum_nni;
74 int remote_protocol = 0;
75 int file_extra_cnt = 0; /* count of file-list extras that everyone gets */
78 int use_safe_inc_flist = 0;
79 int want_xattr_optim = 0;
80 int proper_seed_order = 0;
81 int inplace_partial = 0;
82 int do_negotiated_strings = 0;
83 int xmit_id0_names = 0;
85 struct name_num_item *xattr_sum_nni;
86 int xattr_sum_len = 0;
88 /* These index values are for the file-list's extra-attribute array. */
89 int pathname_ndx, depth_ndx, atimes_ndx, crtimes_ndx, uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
91 int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
92 int sender_symlink_iconv = 0; /* sender should convert symlink content */
95 int filesfrom_convert = 0;
98 #define MAX_NSTR_STRLEN 256
100 struct name_num_item valid_compressions_items[] = {
102 { CPRES_ZSTD, 0, "zstd", NULL },
105 { CPRES_LZ4, 0, "lz4", NULL },
107 { CPRES_ZLIBX, 0, "zlibx", NULL },
108 { CPRES_ZLIB, 0, "zlib", NULL },
109 { CPRES_NONE, 0, "none", NULL },
113 struct name_num_obj valid_compressions = {
114 "compress", NULL, 0, 0, valid_compressions_items
117 #define CF_INC_RECURSE (1<<0)
118 #define CF_SYMLINK_TIMES (1<<1)
119 #define CF_SYMLINK_ICONV (1<<2)
120 #define CF_SAFE_FLIST (1<<3)
121 #define CF_AVOID_XATTR_OPTIM (1<<4)
122 #define CF_CHKSUM_SEED_FIX (1<<5)
123 #define CF_INPLACE_PARTIAL_DIR (1<<6)
124 #define CF_VARINT_FLIST_FLAGS (1<<7)
125 #define CF_ID0_NAMES (1<<8)
127 static const char *client_info;
129 /* The server makes sure that if either side only supports a pre-release
130 * version of a protocol, that both sides must speak a compatible version
131 * of that protocol for it to be advertised as available. */
132 static void check_sub_protocol(void)
135 int their_protocol, their_sub;
136 int our_sub = get_subprotocol_version();
138 /* client_info starts with VER.SUB string if client is a pre-release. */
139 if (!(their_protocol = atoi(client_info))
140 || !(dot = strchr(client_info, '.'))
141 || !(their_sub = atoi(dot+1))) {
142 #if SUBPROTOCOL_VERSION != 0
149 if (their_protocol < protocol_version) {
151 protocol_version = their_protocol - 1;
155 if (their_protocol > protocol_version)
156 their_sub = 0; /* 0 == final version of older protocol */
157 if (their_sub != our_sub)
161 void set_allow_inc_recurse(void)
164 client_info = shell_cmd ? shell_cmd : "";
165 else if (am_server) {
167 maybe_add_e_option(buf, sizeof buf);
168 client_info = *buf ? strdup(buf+1) : ""; /* The +1 skips the leading "e". */
171 if (!recurse || use_qsort)
172 allow_inc_recurse = 0;
174 && (delete_before || delete_after
175 || delay_updates || prune_empty_dirs))
176 allow_inc_recurse = 0;
177 else if (am_server && strchr(client_info, 'i') == NULL)
178 allow_inc_recurse = 0;
181 void parse_compress_choice(int final_call)
183 if (valid_compressions.negotiated_nni)
184 do_compression = valid_compressions.negotiated_nni->num;
185 else if (compress_choice) {
186 struct name_num_item *nni = get_nni_by_name(&valid_compressions, compress_choice, -1);
188 rprintf(FERROR, "unknown compress name: %s\n", compress_choice);
189 exit_cleanup(RERR_UNSUPPORTED);
191 do_compression = nni->num;
193 validate_choice_vs_env(NSTR_COMPRESS, do_compression, -1);
194 } else if (do_compression)
195 do_compression = CPRES_ZLIB;
197 do_compression = CPRES_NONE;
199 if (do_compression != CPRES_NONE && final_call)
200 init_compression_level(); /* There's a chance this might turn compression off! */
202 if (do_compression == CPRES_NONE)
203 compress_choice = NULL;
205 /* Snag the compression name for both write_batch's option output & the following debug output. */
206 if (valid_compressions.negotiated_nni)
207 compress_choice = valid_compressions.negotiated_nni->name;
208 else if (compress_choice == NULL) {
209 struct name_num_item *nni = get_nni_by_num(&valid_compressions, do_compression);
210 compress_choice = nni ? nni->name : "UNKNOWN";
213 if (final_call && DEBUG_GTE(NSTR, am_server ? 3 : 1)
214 && (do_compression != CPRES_NONE || do_compression_level != CLVL_NOT_SPECIFIED)) {
215 rprintf(FINFO, "%s%s compress: %s (level %d)\n",
216 am_server ? "Server" : "Client",
217 valid_compressions.negotiated_nni ? " negotiated" : "",
218 compress_choice, do_compression_level);
222 struct name_num_item *get_nni_by_name(struct name_num_obj *nno, const char *name, int len)
224 struct name_num_item *nni;
229 for (nni = nno->list; nni->name; nni++) {
230 if (nni->num == CSUM_gone)
232 if (strncasecmp(name, nni->name, len) == 0 && nni->name[len] == '\0')
239 struct name_num_item *get_nni_by_num(struct name_num_obj *nno, int num)
241 struct name_num_item *nni;
243 for (nni = nno->list; nni->name; nni++) {
251 static void init_nno_saw(struct name_num_obj *nno, int val)
253 struct name_num_item *nni;
257 for (nni = nno->list; nni->name; nni++) {
258 if (nni->num >= nno->saw_len)
259 nno->saw_len = nni->num + 1;
264 nno->saw = new_array0(uchar, nno->saw_len);
266 /* We'll take this opportunity to set the main_nni values for duplicates. */
267 for (cnt = 1, nni = nno->list; nni->name; nni++, cnt++) {
268 if (nni->num == CSUM_gone)
270 if (nno->saw[nni->num])
271 nni->main_nni = &nno->list[nno->saw[nni->num]-1];
273 nno->saw[nni->num] = cnt;
277 memset(nno->saw, val, nno->saw_len);
280 /* Simplify the user-provided string so that it contains valid names without any duplicates.
281 * It also sets the "saw" flags to a 1-relative count of which name was seen first. */
282 static int parse_nni_str(struct name_num_obj *nno, const char *from, char *tobuf, int tobuf_len)
284 char *to = tobuf, *tok = NULL;
285 int saw_tok = 0, cnt = 0;
288 int at_space = isSpace(from);
292 if (!ch || at_space) {
294 struct name_num_item *nni = get_nni_by_name(nno, tok, to - tok);
295 if (nni && !nno->saw[nni->num]) {
296 nno->saw[nni->num] = ++cnt;
298 to = tok + strlcpy(tok, nni->main_nni->name, tobuf_len - (tok - tobuf));
299 if (to - tobuf >= tobuf_len) {
305 to = tok - (tok != tobuf);
318 if (to - tobuf >= tobuf_len - 1) {
319 to = tok - (tok != tobuf);
326 if (saw_tok && to == tobuf)
327 return strlcpy(tobuf, "INVALID", MAX_NSTR_STRLEN);
332 static int parse_negotiate_str(struct name_num_obj *nno, char *tmpbuf)
334 struct name_num_item *nni, *ret = NULL;
335 int best = nno->saw_len; /* We want best == 1 from the client list, so start with a big number. */
336 char *space, *tok = tmpbuf;
338 while (*tok == ' ') tok++; /* Should be unneeded... */
341 if ((space = strchr(tok, ' ')) != NULL)
343 nni = get_nni_by_name(nno, tok, -1);
349 if (!nni || !nno->saw[nni->num] || best <= nno->saw[nni->num])
352 best = nno->saw[nni->num];
353 if (best == 1 || am_server) /* The server side stops at the first acceptable client choice */
359 nno->negotiated_nni = ret->main_nni ? ret->main_nni : ret;
365 /* This routine is always called with a tmpbuf of MAX_NSTR_STRLEN length, but the
366 * buffer may be pre-populated with a "len" length string to use OR a len of -1
367 * to tell us to read a string from the fd. */
368 static void recv_negotiate_str(int f_in, struct name_num_obj *nno, char *tmpbuf, int len)
371 len = read_vstring(f_in, tmpbuf, MAX_NSTR_STRLEN);
373 if (DEBUG_GTE(NSTR, am_server ? 3 : 2)) {
375 rprintf(FINFO, "Client %s list (on server): %s\n", nno->type, tmpbuf);
377 rprintf(FINFO, "Server %s list (on client): %s\n", nno->type, tmpbuf);
380 if (len > 0 && parse_negotiate_str(nno, tmpbuf))
383 if (!am_server || !do_negotiated_strings) {
386 rprintf(FERROR, "Failed to negotiate a %s choice.\n", nno->type);
387 rprintf(FERROR, "%s list: %s\n", am_server ? "Client" : "Server", tmpbuf);
388 /* Recreate our original list from the saw values. This can't overflow our huge
389 * buffer because we don't have enough valid entries to get anywhere close. */
390 for (j = 1, *cp = '\0'; j <= nno->saw_len; j++) {
391 struct name_num_item *nni;
392 for (nni = nno->list; nni->name; nni++) {
393 if (nno->saw[nni->num] == j) {
395 cp += strlcpy(cp, nni->name, MAX_NSTR_STRLEN - (cp - tmpbuf));
401 strlcpy(cp, " INVALID", MAX_NSTR_STRLEN);
402 rprintf(FERROR, "%s list:%s\n", am_server ? "Server" : "Client", tmpbuf);
405 exit_cleanup(RERR_UNSUPPORTED);
408 static const char *getenv_nstr(int ntype)
410 const char *env_str = getenv(ntype == NSTR_COMPRESS ? "RSYNC_COMPRESS_LIST" : "RSYNC_CHECKSUM_LIST");
412 /* When writing a batch file, we always negotiate an old-style choice. */
414 env_str = ntype == NSTR_COMPRESS ? "zlib" : protocol_version >= 30 ? "md5" : "md4";
416 if (am_server && env_str) {
417 char *cp = strchr(env_str, '&');
425 void validate_choice_vs_env(int ntype, int num1, int num2)
427 struct name_num_obj *nno = ntype == NSTR_COMPRESS ? &valid_compressions : &valid_checksums;
428 const char *list_str = getenv_nstr(ntype);
429 char tmpbuf[MAX_NSTR_STRLEN];
434 while (isSpace(list_str)) list_str++;
439 init_nno_saw(nno, 0);
440 parse_nni_str(nno, list_str, tmpbuf, MAX_NSTR_STRLEN);
442 if (ntype == NSTR_CHECKSUM) /* If "md4" is in the env list, all the old MD4 choices are OK too. */
443 nno->saw[CSUM_MD4_ARCHAIC] = nno->saw[CSUM_MD4_BUSTED] = nno->saw[CSUM_MD4_OLD] = nno->saw[CSUM_MD4];
445 if (!nno->saw[num1] || (num2 >= 0 && !nno->saw[num2])) {
446 rprintf(FERROR, "Your --%s-choice value (%s) was refused by the server.\n",
447 ntype == NSTR_COMPRESS ? "compress" : "checksum",
448 ntype == NSTR_COMPRESS ? compress_choice : checksum_choice);
449 exit_cleanup(RERR_UNSUPPORTED);
456 /* The saw buffer is initialized and used to store ordinal values from 1 to N
457 * for the order of the args in the array. If dup_markup == '\0', duplicates
458 * are removed otherwise the char is prefixed to the duplicate term and, if it
459 * is an opening paren/bracket/brace, the matching closing char is suffixed.
460 * "none" is removed on the client side unless dup_markup != '\0'. */
461 int get_default_nno_list(struct name_num_obj *nno, char *to_buf, int to_buf_len, char dup_markup)
463 struct name_num_item *nni;
464 int len = 0, cnt = 0;
465 char delim = '\0', post_delim;
467 switch (dup_markup) {
468 case '(': post_delim = ')'; break;
469 case '[': post_delim = ']'; break;
470 case '{': post_delim = '}'; break;
471 default: post_delim = '\0'; break;
474 init_nno_saw(nno, 0);
476 for (nni = nno->list, len = 0; nni->name; nni++) {
477 if (nni->num == CSUM_gone)
480 if (!dup_markup || nni->main_nni->num == CSUM_gone)
484 if (nni->num == 0 && !am_server && !dup_markup)
489 to_buf[len++]= delim;
492 len += strlcpy(to_buf+len, nni->name, to_buf_len - len);
493 if (len >= to_buf_len - 3)
494 exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE... */
496 to_buf[len++]= delim;
499 nno->saw[nni->num] = ++cnt;
505 static void send_negotiate_str(int f_out, struct name_num_obj *nno, int ntype)
507 char tmpbuf[MAX_NSTR_STRLEN];
508 const char *list_str = getenv_nstr(ntype);
511 if (list_str && *list_str) {
512 init_nno_saw(nno, 0);
513 len = parse_nni_str(nno, list_str, tmpbuf, MAX_NSTR_STRLEN);
518 if (!list_str || !*list_str)
519 len = get_default_nno_list(nno, tmpbuf, MAX_NSTR_STRLEN, '\0');
521 if (DEBUG_GTE(NSTR, am_server ? 3 : 2)) {
523 rprintf(FINFO, "Server %s list (on server): %s\n", nno->type, tmpbuf);
525 rprintf(FINFO, "Client %s list (on client): %s\n", nno->type, tmpbuf);
528 /* Each side sends their list of valid names to the other side and then both sides
529 * pick the first name in the client's list that is also in the server's list. */
530 if (do_negotiated_strings)
531 write_vstring(f_out, tmpbuf, len);
534 static void negotiate_the_strings(int f_in, int f_out)
536 /* We send all the negotiation strings before we start to read them to help avoid a slow startup. */
538 init_checksum_choices();
540 if (!checksum_choice)
541 send_negotiate_str(f_out, &valid_checksums, NSTR_CHECKSUM);
543 if (do_compression && !compress_choice)
544 send_negotiate_str(f_out, &valid_compressions, NSTR_COMPRESS);
546 if (valid_checksums.saw) {
547 char tmpbuf[MAX_NSTR_STRLEN];
549 if (do_negotiated_strings)
552 len = strlcpy(tmpbuf, protocol_version >= 30 ? "md5" : "md4", MAX_NSTR_STRLEN);
553 recv_negotiate_str(f_in, &valid_checksums, tmpbuf, len);
556 if (valid_compressions.saw) {
557 char tmpbuf[MAX_NSTR_STRLEN];
559 if (do_negotiated_strings)
562 len = strlcpy(tmpbuf, "zlib", MAX_NSTR_STRLEN);
563 recv_negotiate_str(f_in, &valid_compressions, tmpbuf, len);
566 /* If the other side is too old to negotiate, the above steps just made sure that
567 * the env didn't disallow the old algorithm. Mark things as non-negotiated. */
568 if (!do_negotiated_strings)
569 valid_checksums.negotiated_nni = valid_compressions.negotiated_nni = NULL;
572 void setup_protocol(int f_out,int f_in)
574 assert(file_extra_cnt == 0);
575 assert(EXTRA64_CNT == 2 || EXTRA64_CNT == 1);
577 /* All int64 values must be set first so that they are guaranteed to be
578 * aligned for direct int64-pointer memory access. */
580 atimes_ndx = (file_extra_cnt += EXTRA64_CNT);
581 if (preserve_crtimes)
582 crtimes_ndx = (file_extra_cnt += EXTRA64_CNT);
583 if (am_sender) /* This is most likely in the file_extras64 union as well. */
584 pathname_ndx = (file_extra_cnt += PTR_EXTRA_CNT);
586 depth_ndx = ++file_extra_cnt;
588 uid_ndx = ++file_extra_cnt;
590 gid_ndx = ++file_extra_cnt;
591 if (preserve_acls && !am_sender)
592 acls_ndx = ++file_extra_cnt;
594 xattrs_ndx = ++file_extra_cnt;
597 set_allow_inc_recurse();
599 if (remote_protocol == 0) {
600 if (am_server && !local_server)
601 check_sub_protocol();
603 write_int(f_out, protocol_version);
604 remote_protocol = read_int(f_in);
605 if (protocol_version > remote_protocol)
606 protocol_version = remote_protocol;
608 if (read_batch && remote_protocol > protocol_version) {
609 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
610 remote_protocol, protocol_version);
611 exit_cleanup(RERR_PROTOCOL);
614 if (DEBUG_GTE(PROTO, 1)) {
615 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
616 am_server? "Server" : "Client", remote_protocol, protocol_version);
618 if (remote_protocol < MIN_PROTOCOL_VERSION
619 || remote_protocol > MAX_PROTOCOL_VERSION) {
620 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
621 rprintf(FERROR,"(see the rsync manpage for an explanation)\n");
622 exit_cleanup(RERR_PROTOCOL);
624 if (remote_protocol < OLD_PROTOCOL_VERSION) {
625 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
626 am_server? "Client" : "Server");
628 if (protocol_version < MIN_PROTOCOL_VERSION) {
629 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
630 MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
631 exit_cleanup(RERR_PROTOCOL);
633 if (protocol_version > PROTOCOL_VERSION) {
634 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
635 PROTOCOL_VERSION, am_server? "Server" : "Client");
636 exit_cleanup(RERR_PROTOCOL);
641 if (!saw_stderr_opt && protocol_version <= 28 && am_server)
642 msgs2stderr = 0; /* The client side may not have stderr setup for us. */
644 #ifndef SUPPORT_PREALLOCATION
645 if (preallocate_files && !am_sender) {
646 rprintf(FERROR, "preallocation is not supported on this %s\n",
647 am_server ? "Server" : "Client");
648 exit_cleanup(RERR_SYNTAX);
652 if (protocol_version < 30) {
653 if (append_mode == 1)
655 if (preserve_acls && !local_server) {
657 "--acls requires protocol 30 or higher"
658 " (negotiated %d).\n",
660 exit_cleanup(RERR_PROTOCOL);
662 if (preserve_xattrs && !local_server) {
664 "--xattrs requires protocol 30 or higher"
665 " (negotiated %d).\n",
667 exit_cleanup(RERR_PROTOCOL);
671 if (delete_mode && !(delete_before+delete_during+delete_after)) {
672 if (protocol_version < 30)
678 if (protocol_version < 29) {
681 "--fuzzy requires protocol 29 or higher"
682 " (negotiated %d).\n",
684 exit_cleanup(RERR_PROTOCOL);
687 if (basis_dir_cnt && inplace) {
689 "%s with --inplace requires protocol 29 or higher"
690 " (negotiated %d).\n",
691 alt_dest_opt(0), protocol_version);
692 exit_cleanup(RERR_PROTOCOL);
695 if (basis_dir_cnt > 1) {
697 "Using more than one %s option requires protocol"
698 " 29 or higher (negotiated %d).\n",
699 alt_dest_opt(0), protocol_version);
700 exit_cleanup(RERR_PROTOCOL);
703 if (prune_empty_dirs) {
705 "--prune-empty-dirs requires protocol 29 or higher"
706 " (negotiated %d).\n",
708 exit_cleanup(RERR_PROTOCOL);
710 } else if (protocol_version >= 30) {
712 compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
713 #ifdef CAN_SET_SYMLINK_TIMES
714 compat_flags |= CF_SYMLINK_TIMES;
717 compat_flags |= CF_SYMLINK_ICONV;
719 if (strchr(client_info, 'f') != NULL)
720 compat_flags |= CF_SAFE_FLIST;
721 if (strchr(client_info, 'x') != NULL)
722 compat_flags |= CF_AVOID_XATTR_OPTIM;
723 if (strchr(client_info, 'C') != NULL)
724 compat_flags |= CF_CHKSUM_SEED_FIX;
725 if (strchr(client_info, 'I') != NULL)
726 compat_flags |= CF_INPLACE_PARTIAL_DIR;
727 if (strchr(client_info, 'u') != NULL)
728 compat_flags |= CF_ID0_NAMES;
729 if (strchr(client_info, 'v') != NULL) {
730 do_negotiated_strings = 1;
731 compat_flags |= CF_VARINT_FLIST_FLAGS;
733 if (strchr(client_info, 'V') != NULL) { /* Support a pre-release 'V' that got superseded */
735 compat_flags |= CF_VARINT_FLIST_FLAGS;
736 write_byte(f_out, compat_flags);
738 write_varint(f_out, compat_flags);
739 } else { /* read_varint() is compatible with the older write_byte() when the 0x80 bit isn't on. */
740 compat_flags = read_varint(f_in);
741 if (compat_flags & CF_VARINT_FLIST_FLAGS)
742 do_negotiated_strings = 1;
744 /* The inc_recurse var MUST be set to 0 or 1. */
745 inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
746 want_xattr_optim = protocol_version >= 31 && !(compat_flags & CF_AVOID_XATTR_OPTIM);
747 proper_seed_order = compat_flags & CF_CHKSUM_SEED_FIX ? 1 : 0;
748 xfer_flags_as_varint = compat_flags & CF_VARINT_FLIST_FLAGS ? 1 : 0;
749 xmit_id0_names = compat_flags & CF_ID0_NAMES ? 1 : 0;
750 if (!xfer_flags_as_varint && preserve_crtimes) {
751 fprintf(stderr, "Both rsync versions must be at least 3.2.0 for --crtimes.\n");
752 exit_cleanup(RERR_PROTOCOL);
755 receiver_symlink_times = am_server
756 ? strchr(client_info, 'L') != NULL
757 : !!(compat_flags & CF_SYMLINK_TIMES);
759 #ifdef CAN_SET_SYMLINK_TIMES
761 receiver_symlink_times = 1;
764 sender_symlink_iconv = iconv_opt && (am_server
765 ? strchr(client_info, 's') != NULL
766 : !!(compat_flags & CF_SYMLINK_ICONV));
768 if (inc_recurse && !allow_inc_recurse) {
769 /* This should only be able to happen in a batch. */
771 "Incompatible options specified for inc-recursive %s.\n",
772 read_batch ? "batch file" : "connection");
773 exit_cleanup(RERR_SYNTAX);
775 use_safe_inc_flist = (compat_flags & CF_SAFE_FLIST) || protocol_version >= 31;
776 need_messages_from_generator = 1;
777 if (compat_flags & CF_INPLACE_PARTIAL_DIR)
779 #ifdef CAN_SET_SYMLINK_TIMES
780 } else if (!am_sender) {
781 receiver_symlink_times = 1;
786 do_negotiated_strings = 0;
788 if (need_unsorted_flist && (!am_sender || inc_recurse))
789 unsort_ndx = ++file_extra_cnt;
791 if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
792 int rflags = FILTRULE_NO_PREFIXES | FILTRULE_DIRECTORY;
793 if (!am_sender || protocol_version >= 30)
794 rflags |= FILTRULE_PERISHABLE;
795 parse_filter_str(&filter_list, partial_dir, rule_template(rflags), 0);
800 if (protect_args && files_from) {
802 filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
804 filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
808 negotiate_the_strings(f_in, f_out);
812 checksum_seed = time(NULL) ^ (getpid() << 6);
813 write_int(f_out, checksum_seed);
815 checksum_seed = read_int(f_in);
818 parse_checksum_choice(1); /* Sets file_sum_nni & xfer_sum_nni */
819 parse_compress_choice(1); /* Sets do_compression */
821 /* TODO in the future allow this algorithm to be chosen somehow, but it can't get too
822 * long or the size starts to cause a problem in the xattr abbrev/non-abbrev code. */
823 xattr_sum_nni = parse_csum_name(NULL, 0);
824 xattr_sum_len = csum_len_for_type(xattr_sum_nni->num, 0);
826 if (write_batch && !am_server)
827 write_batch_shell_file();
832 void output_daemon_greeting(int f_out, int am_client)
834 char tmpbuf[MAX_NSTR_STRLEN];
835 int our_sub = get_subprotocol_version();
837 init_checksum_choices();
839 get_default_nno_list(&valid_auth_checksums, tmpbuf, MAX_NSTR_STRLEN, '\0');
841 io_printf(f_out, "@RSYNCD: %d.%d %s\n", protocol_version, our_sub, tmpbuf);
843 if (am_client && DEBUG_GTE(NSTR, 2))
844 rprintf(FINFO, "Client %s list (on client): %s\n", valid_auth_checksums.type, tmpbuf);
847 void negotiate_daemon_auth(int f_out, int am_client)
849 char tmpbuf[MAX_NSTR_STRLEN];
850 int save_am_server = am_server;
856 if (daemon_auth_choices)
857 strlcpy(tmpbuf, daemon_auth_choices, MAX_NSTR_STRLEN);
859 strlcpy(tmpbuf, protocol_version >= 30 ? "md5" : "md4", MAX_NSTR_STRLEN);
864 recv_negotiate_str(-1, &valid_auth_checksums, tmpbuf, strlen(tmpbuf));
865 if (DEBUG_GTE(NSTR, 1)) {
866 rprintf(FINFO, "Client negotiated %s: %s\n", valid_auth_checksums.type,
867 valid_auth_checksums.negotiated_nni->name);
870 if (!parse_negotiate_str(&valid_auth_checksums, tmpbuf)) {
871 get_default_nno_list(&valid_auth_checksums, tmpbuf, MAX_NSTR_STRLEN, '\0');
872 io_printf(f_out, "@ERROR: your client does not support one of our daemon-auth checksums: %s\n",
874 exit_cleanup(RERR_UNSUPPORTED);
877 am_server = save_am_server;
878 if (md4_is_old && valid_auth_checksums.negotiated_nni->num == CSUM_MD4) {
879 valid_auth_checksums.negotiated_nni->num = CSUM_MD4_OLD;
880 valid_auth_checksums.negotiated_nni->flags = 0;
884 int get_subprotocol_version()
886 #if SUBPROTOCOL_VERSION != 0
887 return protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;