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) 2004-2009 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:
30: extern int verbose;
31: extern int am_server;
32: extern int am_sender;
33: extern int local_server;
34: extern int inplace;
35: extern int recurse;
36: extern int use_qsort;
37: extern int allow_inc_recurse;
38: extern int append_mode;
39: extern int fuzzy_basis;
40: extern int read_batch;
41: extern int delay_updates;
42: extern int checksum_seed;
43: extern int basis_dir_cnt;
44: extern int detect_renamed;
45: extern int prune_empty_dirs;
46: extern int protocol_version;
47: extern int protect_args;
48: extern int preserve_uid;
49: extern int preserve_gid;
50: extern int preserve_acls;
51: extern int preserve_xattrs;
52: extern int need_messages_from_generator;
53: extern int delete_mode, delete_before, delete_during, delete_after;
54: extern char *shell_cmd;
55: extern char *partial_dir;
56: extern char *dest_option;
57: extern char *files_from;
58: extern char *filesfrom_host;
59: extern struct filter_list_struct filter_list;
60: extern int need_unsorted_flist;
61: #ifdef ICONV_OPTION
62: extern iconv_t ic_send, ic_recv;
63: extern char *iconv_opt;
64: #endif
65:
66: /* These index values are for the file-list's extra-attribute array. */
67: int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
68:
69: int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
70: int sender_symlink_iconv = 0; /* sender should convert symlink content */
71:
72: #ifdef ICONV_OPTION
73: int filesfrom_convert = 0;
74: #endif
75:
76: #define CF_INC_RECURSE (1<<0)
77: #define CF_SYMLINK_TIMES (1<<1)
78: #define CF_SYMLINK_ICONV (1<<2)
79: #define CF_SAFE_FLIST (1<<3)
80:
81: static const char *client_info;
82:
83: /* The server makes sure that if either side only supports a pre-release
84: * version of a protocol, that both sides must speak a compatible version
85: * of that protocol for it to be advertised as available. */
86: static void check_sub_protocol(void)
87: {
88: char *dot;
89: int their_protocol, their_sub;
90: #if SUBPROTOCOL_VERSION != 0
91: int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
92: #else
93: int our_sub = 0;
94: #endif
95:
96: /* client_info starts with VER.SUB string if client is a pre-release. */
97: if (!(their_protocol = atoi(client_info))
98: || !(dot = strchr(client_info, '.'))
99: || !(their_sub = atoi(dot+1))) {
100: #if SUBPROTOCOL_VERSION != 0
101: if (our_sub)
102: protocol_version--;
103: #endif
104: return;
105: }
106:
107: if (their_protocol < protocol_version) {
108: if (their_sub)
109: protocol_version = their_protocol - 1;
110: return;
111: }
112:
113: if (their_protocol > protocol_version)
114: their_sub = 0; /* 0 == final version of older protocol */
115: if (their_sub != our_sub)
116: protocol_version--;
117: }
118:
119: void set_allow_inc_recurse(void)
120: {
121: client_info = shell_cmd ? shell_cmd : "";
122:
123: if (!recurse || use_qsort)
124: allow_inc_recurse = 0;
125: else if (!am_sender
126: && (delete_before || delete_after
127: || detect_renamed
128: || delay_updates || prune_empty_dirs))
129: allow_inc_recurse = 0;
130: else if (am_server && !local_server
131: && (strchr(client_info, 'i') == NULL))
132: allow_inc_recurse = 0;
133: }
134:
135: void setup_protocol(int f_out,int f_in)
136: {
137: if (am_sender)
138: file_extra_cnt += PTR_EXTRA_CNT;
139: else
140: file_extra_cnt++;
141: if (preserve_uid)
142: uid_ndx = ++file_extra_cnt;
143: if (preserve_gid)
144: gid_ndx = ++file_extra_cnt;
145: if (preserve_acls && !am_sender)
146: acls_ndx = ++file_extra_cnt;
147: if (preserve_xattrs)
148: xattrs_ndx = ++file_extra_cnt;
149:
150: if (am_server)
151: set_allow_inc_recurse();
152:
153: if (remote_protocol == 0) {
154: if (am_server && !local_server)
155: check_sub_protocol();
156: if (!read_batch)
157: write_int(f_out, protocol_version);
158: remote_protocol = read_int(f_in);
159: if (protocol_version > remote_protocol)
160: protocol_version = remote_protocol;
161: }
162: if (read_batch && remote_protocol > protocol_version) {
163: rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
164: remote_protocol, protocol_version);
165: exit_cleanup(RERR_PROTOCOL);
166: }
167:
168: if (verbose > 3) {
169: rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
170: am_server? "Server" : "Client", remote_protocol, protocol_version);
171: }
172: if (remote_protocol < MIN_PROTOCOL_VERSION
173: || remote_protocol > MAX_PROTOCOL_VERSION) {
174: rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
175: rprintf(FERROR,"(see the rsync man page for an explanation)\n");
176: exit_cleanup(RERR_PROTOCOL);
177: }
178: if (remote_protocol < OLD_PROTOCOL_VERSION) {
179: rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
180: am_server? "Client" : "Server");
181: }
182: if (protocol_version < MIN_PROTOCOL_VERSION) {
183: rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
184: MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
185: exit_cleanup(RERR_PROTOCOL);
186: }
187: if (protocol_version > PROTOCOL_VERSION) {
188: rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
189: PROTOCOL_VERSION, am_server? "Server" : "Client");
190: exit_cleanup(RERR_PROTOCOL);
191: }
192: if (read_batch)
193: check_batch_flags();
194:
195: if (protocol_version < 30) {
196: if (append_mode == 1)
197: append_mode = 2;
198: if (preserve_acls && !local_server) {
199: rprintf(FERROR,
200: "--acls requires protocol 30 or higher"
201: " (negotiated %d).\n",
202: protocol_version);
203: exit_cleanup(RERR_PROTOCOL);
204: }
205: if (preserve_xattrs && !local_server) {
206: rprintf(FERROR,
207: "--xattrs requires protocol 30 or higher"
208: " (negotiated %d).\n",
209: protocol_version);
210: exit_cleanup(RERR_PROTOCOL);
211: }
212: }
213:
214: if (delete_mode && !(delete_before+delete_during+delete_after)) {
215: if (protocol_version < 30)
216: delete_before = 1;
217: else
218: delete_during = 1;
219: }
220:
221: if (protocol_version < 29) {
222: if (fuzzy_basis) {
223: rprintf(FERROR,
224: "--fuzzy requires protocol 29 or higher"
225: " (negotiated %d).\n",
226: protocol_version);
227: exit_cleanup(RERR_PROTOCOL);
228: }
229:
230: if (basis_dir_cnt && inplace) {
231: rprintf(FERROR,
232: "%s with --inplace requires protocol 29 or higher"
233: " (negotiated %d).\n",
234: dest_option, protocol_version);
235: exit_cleanup(RERR_PROTOCOL);
236: }
237:
238: if (basis_dir_cnt > 1) {
239: rprintf(FERROR,
240: "Using more than one %s option requires protocol"
241: " 29 or higher (negotiated %d).\n",
242: dest_option, protocol_version);
243: exit_cleanup(RERR_PROTOCOL);
244: }
245:
246: if (prune_empty_dirs) {
247: rprintf(FERROR,
248: "--prune-empty-dirs requires protocol 29 or higher"
249: " (negotiated %d).\n",
250: protocol_version);
251: exit_cleanup(RERR_PROTOCOL);
252: }
253: } else if (protocol_version >= 30) {
254: if (am_server) {
255: compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
256: #ifdef CAN_SET_SYMLINK_TIMES
257: compat_flags |= CF_SYMLINK_TIMES;
258: #endif
259: #ifdef ICONV_OPTION
260: compat_flags |= CF_SYMLINK_ICONV;
261: #endif
262: if (local_server || strchr(client_info, 'f') != NULL)
263: compat_flags |= CF_SAFE_FLIST;
264: write_byte(f_out, compat_flags);
265: } else
266: compat_flags = read_byte(f_in);
267: /* The inc_recurse var MUST be set to 0 or 1. */
268: inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
269: if (am_sender) {
270: receiver_symlink_times = am_server
271: ? strchr(client_info, 'L') != NULL
272: : !!(compat_flags & CF_SYMLINK_TIMES);
273: }
274: #ifdef CAN_SET_SYMLINK_TIMES
275: else
276: receiver_symlink_times = 1;
277: #endif
278: #ifdef ICONV_OPTION
279: sender_symlink_iconv = iconv_opt && (am_server
280: ? local_server || strchr(client_info, 's') != NULL
281: : !!(compat_flags & CF_SYMLINK_ICONV));
282: #endif
283: if (inc_recurse && !allow_inc_recurse) {
284: /* This should only be able to happen in a batch. */
285: fprintf(stderr,
286: "Incompatible options specified for inc-recursive %s.\n",
287: read_batch ? "batch file" : "connection");
288: exit_cleanup(RERR_SYNTAX);
289: }
290: use_safe_inc_flist = !!(compat_flags & CF_SAFE_FLIST);
291: need_messages_from_generator = 1;
292: #ifdef CAN_SET_SYMLINK_TIMES
293: } else if (!am_sender) {
294: receiver_symlink_times = 1;
295: #endif
296: }
297:
298: if (need_unsorted_flist && (!am_sender || inc_recurse))
299: unsort_ndx = ++file_extra_cnt;
300:
301: if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
302: int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
303: if (!am_sender || protocol_version >= 30)
304: flags |= MATCHFLG_PERISHABLE;
305: parse_rule(&filter_list, partial_dir, flags, 0);
306: }
307:
308:
309: #ifdef ICONV_OPTION
310: if (protect_args && files_from) {
311: if (am_sender)
312: filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
313: else
314: filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
315: }
316: #endif
317:
318: if (am_server) {
319: if (!checksum_seed)
320: checksum_seed = time(NULL);
321: write_int(f_out, checksum_seed);
322: } else {
323: checksum_seed = read_int(f_in);
324: }
325: }
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