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) 2004-2015 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:
24: int remote_protocol = 0;
25: int file_extra_cnt = 0; /* count of file-list extras that everyone gets */
26: int inc_recurse = 0;
27: int compat_flags = 0;
28: int use_safe_inc_flist = 0;
29: int want_xattr_optim = 0;
30: int proper_seed_order = 0;
31:
32: extern int am_server;
33: extern int am_sender;
34: extern int local_server;
35: extern int inplace;
36: extern int recurse;
37: extern int use_qsort;
38: extern int allow_inc_recurse;
39: extern int preallocate_files;
40: extern int append_mode;
41: extern int fuzzy_basis;
42: extern int read_batch;
43: extern int delay_updates;
44: extern int checksum_seed;
45: extern int basis_dir_cnt;
46: extern int prune_empty_dirs;
47: extern int protocol_version;
48: extern int protect_args;
49: extern int preserve_uid;
50: extern int preserve_gid;
51: extern int preserve_acls;
52: extern int preserve_xattrs;
53: extern int need_messages_from_generator;
54: extern int delete_mode, delete_before, delete_during, delete_after;
55: extern char *shell_cmd;
56: extern char *partial_dir;
57: extern char *dest_option;
58: extern char *files_from;
59: extern char *filesfrom_host;
60: extern filter_rule_list filter_list;
61: extern int need_unsorted_flist;
62: #ifdef ICONV_OPTION
63: extern iconv_t ic_send, ic_recv;
64: extern char *iconv_opt;
65: #endif
66:
67: /* These index values are for the file-list's extra-attribute array. */
68: int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
69:
70: int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
71: int sender_symlink_iconv = 0; /* sender should convert symlink content */
72:
73: #ifdef ICONV_OPTION
74: int filesfrom_convert = 0;
75: #endif
76:
77: #define CF_INC_RECURSE (1<<0)
78: #define CF_SYMLINK_TIMES (1<<1)
79: #define CF_SYMLINK_ICONV (1<<2)
80: #define CF_SAFE_FLIST (1<<3)
81: #define CF_AVOID_XATTR_OPTIM (1<<4)
82: #define CF_CHKSUM_SEED_FIX (1<<5)
83:
84: static const char *client_info;
85:
86: /* The server makes sure that if either side only supports a pre-release
87: * version of a protocol, that both sides must speak a compatible version
88: * of that protocol for it to be advertised as available. */
89: static void check_sub_protocol(void)
90: {
91: char *dot;
92: int their_protocol, their_sub;
93: #if SUBPROTOCOL_VERSION != 0
94: int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
95: #else
96: int our_sub = 0;
97: #endif
98:
99: /* client_info starts with VER.SUB string if client is a pre-release. */
100: if (!(their_protocol = atoi(client_info))
101: || !(dot = strchr(client_info, '.'))
102: || !(their_sub = atoi(dot+1))) {
103: #if SUBPROTOCOL_VERSION != 0
104: if (our_sub)
105: protocol_version--;
106: #endif
107: return;
108: }
109:
110: if (their_protocol < protocol_version) {
111: if (their_sub)
112: protocol_version = their_protocol - 1;
113: return;
114: }
115:
116: if (their_protocol > protocol_version)
117: their_sub = 0; /* 0 == final version of older protocol */
118: if (their_sub != our_sub)
119: protocol_version--;
120: }
121:
122: void set_allow_inc_recurse(void)
123: {
124: client_info = shell_cmd ? shell_cmd : "";
125:
126: if (!recurse || use_qsort)
127: allow_inc_recurse = 0;
128: else if (!am_sender
129: && (delete_before || delete_after
130: || delay_updates || prune_empty_dirs))
131: allow_inc_recurse = 0;
132: else if (am_server && !local_server
133: && (strchr(client_info, 'i') == NULL))
134: allow_inc_recurse = 0;
135: }
136:
137: void setup_protocol(int f_out,int f_in)
138: {
139: if (am_sender)
140: file_extra_cnt += PTR_EXTRA_CNT;
141: else
142: file_extra_cnt++;
143: if (preserve_uid)
144: uid_ndx = ++file_extra_cnt;
145: if (preserve_gid)
146: gid_ndx = ++file_extra_cnt;
147: if (preserve_acls && !am_sender)
148: acls_ndx = ++file_extra_cnt;
149: if (preserve_xattrs)
150: xattrs_ndx = ++file_extra_cnt;
151:
152: if (am_server)
153: set_allow_inc_recurse();
154:
155: if (remote_protocol == 0) {
156: if (am_server && !local_server)
157: check_sub_protocol();
158: if (!read_batch)
159: write_int(f_out, protocol_version);
160: remote_protocol = read_int(f_in);
161: if (protocol_version > remote_protocol)
162: protocol_version = remote_protocol;
163: }
164: if (read_batch && remote_protocol > protocol_version) {
165: rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
166: remote_protocol, protocol_version);
167: exit_cleanup(RERR_PROTOCOL);
168: }
169:
170: if (DEBUG_GTE(PROTO, 1)) {
171: rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
172: am_server? "Server" : "Client", remote_protocol, protocol_version);
173: }
174: if (remote_protocol < MIN_PROTOCOL_VERSION
175: || remote_protocol > MAX_PROTOCOL_VERSION) {
176: rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
177: rprintf(FERROR,"(see the rsync man page for an explanation)\n");
178: exit_cleanup(RERR_PROTOCOL);
179: }
180: if (remote_protocol < OLD_PROTOCOL_VERSION) {
181: rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
182: am_server? "Client" : "Server");
183: }
184: if (protocol_version < MIN_PROTOCOL_VERSION) {
185: rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
186: MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
187: exit_cleanup(RERR_PROTOCOL);
188: }
189: if (protocol_version > PROTOCOL_VERSION) {
190: rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
191: PROTOCOL_VERSION, am_server? "Server" : "Client");
192: exit_cleanup(RERR_PROTOCOL);
193: }
194: if (read_batch)
195: check_batch_flags();
196:
197: #ifndef SUPPORT_PREALLOCATION
198: if (preallocate_files && !am_sender) {
199: rprintf(FERROR, "preallocation is not supported on this %s\n",
200: am_server ? "Server" : "Client");
201: exit_cleanup(RERR_SYNTAX);
202: }
203: #endif
204:
205: if (protocol_version < 30) {
206: if (append_mode == 1)
207: append_mode = 2;
208: if (preserve_acls && !local_server) {
209: rprintf(FERROR,
210: "--acls requires protocol 30 or higher"
211: " (negotiated %d).\n",
212: protocol_version);
213: exit_cleanup(RERR_PROTOCOL);
214: }
215: if (preserve_xattrs && !local_server) {
216: rprintf(FERROR,
217: "--xattrs requires protocol 30 or higher"
218: " (negotiated %d).\n",
219: protocol_version);
220: exit_cleanup(RERR_PROTOCOL);
221: }
222: }
223:
224: if (delete_mode && !(delete_before+delete_during+delete_after)) {
225: if (protocol_version < 30)
226: delete_before = 1;
227: else
228: delete_during = 1;
229: }
230:
231: if (protocol_version < 29) {
232: if (fuzzy_basis) {
233: rprintf(FERROR,
234: "--fuzzy requires protocol 29 or higher"
235: " (negotiated %d).\n",
236: protocol_version);
237: exit_cleanup(RERR_PROTOCOL);
238: }
239:
240: if (basis_dir_cnt && inplace) {
241: rprintf(FERROR,
242: "%s with --inplace requires protocol 29 or higher"
243: " (negotiated %d).\n",
244: dest_option, protocol_version);
245: exit_cleanup(RERR_PROTOCOL);
246: }
247:
248: if (basis_dir_cnt > 1) {
249: rprintf(FERROR,
250: "Using more than one %s option requires protocol"
251: " 29 or higher (negotiated %d).\n",
252: dest_option, protocol_version);
253: exit_cleanup(RERR_PROTOCOL);
254: }
255:
256: if (prune_empty_dirs) {
257: rprintf(FERROR,
258: "--prune-empty-dirs requires protocol 29 or higher"
259: " (negotiated %d).\n",
260: protocol_version);
261: exit_cleanup(RERR_PROTOCOL);
262: }
263: } else if (protocol_version >= 30) {
264: if (am_server) {
265: compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
266: #ifdef CAN_SET_SYMLINK_TIMES
267: compat_flags |= CF_SYMLINK_TIMES;
268: #endif
269: #ifdef ICONV_OPTION
270: compat_flags |= CF_SYMLINK_ICONV;
271: #endif
272: if (local_server || strchr(client_info, 'f') != NULL)
273: compat_flags |= CF_SAFE_FLIST;
274: if (local_server || strchr(client_info, 'x') != NULL)
275: compat_flags |= CF_AVOID_XATTR_OPTIM;
276: if (local_server || strchr(client_info, 'C') != NULL)
277: compat_flags |= CF_CHKSUM_SEED_FIX;
278: write_byte(f_out, compat_flags);
279: } else
280: compat_flags = read_byte(f_in);
281: /* The inc_recurse var MUST be set to 0 or 1. */
282: inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
283: want_xattr_optim = protocol_version >= 31 && !(compat_flags & CF_AVOID_XATTR_OPTIM);
284: proper_seed_order = compat_flags & CF_CHKSUM_SEED_FIX ? 1 : 0;
285: if (am_sender) {
286: receiver_symlink_times = am_server
287: ? strchr(client_info, 'L') != NULL
288: : !!(compat_flags & CF_SYMLINK_TIMES);
289: }
290: #ifdef CAN_SET_SYMLINK_TIMES
291: else
292: receiver_symlink_times = 1;
293: #endif
294: #ifdef ICONV_OPTION
295: sender_symlink_iconv = iconv_opt && (am_server
296: ? local_server || strchr(client_info, 's') != NULL
297: : !!(compat_flags & CF_SYMLINK_ICONV));
298: #endif
299: if (inc_recurse && !allow_inc_recurse) {
300: /* This should only be able to happen in a batch. */
301: fprintf(stderr,
302: "Incompatible options specified for inc-recursive %s.\n",
303: read_batch ? "batch file" : "connection");
304: exit_cleanup(RERR_SYNTAX);
305: }
306: use_safe_inc_flist = (compat_flags & CF_SAFE_FLIST) || protocol_version >= 31;
307: need_messages_from_generator = 1;
308: #ifdef CAN_SET_SYMLINK_TIMES
309: } else if (!am_sender) {
310: receiver_symlink_times = 1;
311: #endif
312: }
313:
314: if (need_unsorted_flist && (!am_sender || inc_recurse))
315: unsort_ndx = ++file_extra_cnt;
316:
317: if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
318: int rflags = FILTRULE_NO_PREFIXES | FILTRULE_DIRECTORY;
319: if (!am_sender || protocol_version >= 30)
320: rflags |= FILTRULE_PERISHABLE;
321: parse_filter_str(&filter_list, partial_dir, rule_template(rflags), 0);
322: }
323:
324:
325: #ifdef ICONV_OPTION
326: if (protect_args && files_from) {
327: if (am_sender)
328: filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
329: else
330: filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
331: }
332: #endif
333:
334: if (am_server) {
335: if (!checksum_seed)
336: checksum_seed = time(NULL) ^ (getpid() << 6);
337: write_int(f_out, checksum_seed);
338: } else {
339: checksum_seed = read_int(f_in);
340: }
341: }
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