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) 2004-2013 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 am_server;
31: extern int am_sender;
32: extern int local_server;
33: extern int inplace;
34: extern int recurse;
35: extern int use_qsort;
36: extern int allow_inc_recurse;
37: extern int preallocate_files;
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 prune_empty_dirs;
45: extern int protocol_version;
46: extern int protect_args;
47: extern int preserve_uid;
48: extern int preserve_gid;
49: extern int preserve_acls;
50: extern int preserve_xattrs;
51: extern int need_messages_from_generator;
52: extern int delete_mode, delete_before, delete_during, delete_after;
53: extern char *shell_cmd;
54: extern char *partial_dir;
55: extern char *dest_option;
56: extern char *files_from;
57: extern char *filesfrom_host;
58: extern filter_rule_list filter_list;
59: extern int need_unsorted_flist;
60: #ifdef ICONV_OPTION
61: extern iconv_t ic_send, ic_recv;
62: extern char *iconv_opt;
63: #endif
64:
65: /* These index values are for the file-list's extra-attribute array. */
66: int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
67:
68: int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
69: int sender_symlink_iconv = 0; /* sender should convert symlink content */
70:
71: #ifdef ICONV_OPTION
72: int filesfrom_convert = 0;
73: #endif
74:
75: #define CF_INC_RECURSE (1<<0)
76: #define CF_SYMLINK_TIMES (1<<1)
77: #define CF_SYMLINK_ICONV (1<<2)
78: #define CF_SAFE_FLIST (1<<3)
79:
80: static const char *client_info;
81:
82: /* The server makes sure that if either side only supports a pre-release
83: * version of a protocol, that both sides must speak a compatible version
84: * of that protocol for it to be advertised as available. */
85: static void check_sub_protocol(void)
86: {
87: char *dot;
88: int their_protocol, their_sub;
89: #if SUBPROTOCOL_VERSION != 0
90: int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
91: #else
92: int our_sub = 0;
93: #endif
94:
95: /* client_info starts with VER.SUB string if client is a pre-release. */
96: if (!(their_protocol = atoi(client_info))
97: || !(dot = strchr(client_info, '.'))
98: || !(their_sub = atoi(dot+1))) {
99: #if SUBPROTOCOL_VERSION != 0
100: if (our_sub)
101: protocol_version--;
102: #endif
103: return;
104: }
105:
106: if (their_protocol < protocol_version) {
107: if (their_sub)
108: protocol_version = their_protocol - 1;
109: return;
110: }
111:
112: if (their_protocol > protocol_version)
113: their_sub = 0; /* 0 == final version of older protocol */
114: if (their_sub != our_sub)
115: protocol_version--;
116: }
117:
118: void set_allow_inc_recurse(void)
119: {
120: client_info = shell_cmd ? shell_cmd : "";
121:
122: if (!recurse || use_qsort)
123: allow_inc_recurse = 0;
124: else if (!am_sender
125: && (delete_before || delete_after
126: || delay_updates || prune_empty_dirs))
127: allow_inc_recurse = 0;
128: else if (am_server && !local_server
129: && (strchr(client_info, 'i') == NULL))
130: allow_inc_recurse = 0;
131: }
132:
133: void setup_protocol(int f_out,int f_in)
134: {
135: if (am_sender)
136: file_extra_cnt += PTR_EXTRA_CNT;
137: else
138: file_extra_cnt++;
139: if (preserve_uid)
140: uid_ndx = ++file_extra_cnt;
141: if (preserve_gid)
142: gid_ndx = ++file_extra_cnt;
143: if (preserve_acls && !am_sender)
144: acls_ndx = ++file_extra_cnt;
145: if (preserve_xattrs)
146: xattrs_ndx = ++file_extra_cnt;
147:
148: if (am_server)
149: set_allow_inc_recurse();
150:
151: if (remote_protocol == 0) {
152: if (am_server && !local_server)
153: check_sub_protocol();
154: if (!read_batch)
155: write_int(f_out, protocol_version);
156: remote_protocol = read_int(f_in);
157: if (protocol_version > remote_protocol)
158: protocol_version = remote_protocol;
159: }
160: if (read_batch && remote_protocol > protocol_version) {
161: rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
162: remote_protocol, protocol_version);
163: exit_cleanup(RERR_PROTOCOL);
164: }
165:
166: if (DEBUG_GTE(PROTO, 1)) {
167: rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
168: am_server? "Server" : "Client", remote_protocol, protocol_version);
169: }
170: if (remote_protocol < MIN_PROTOCOL_VERSION
171: || remote_protocol > MAX_PROTOCOL_VERSION) {
172: rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
173: rprintf(FERROR,"(see the rsync man page for an explanation)\n");
174: exit_cleanup(RERR_PROTOCOL);
175: }
176: if (remote_protocol < OLD_PROTOCOL_VERSION) {
177: rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
178: am_server? "Client" : "Server");
179: }
180: if (protocol_version < MIN_PROTOCOL_VERSION) {
181: rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
182: MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
183: exit_cleanup(RERR_PROTOCOL);
184: }
185: if (protocol_version > PROTOCOL_VERSION) {
186: rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
187: PROTOCOL_VERSION, am_server? "Server" : "Client");
188: exit_cleanup(RERR_PROTOCOL);
189: }
190: if (read_batch)
191: check_batch_flags();
192:
193: #ifndef SUPPORT_PREALLOCATION
194: if (preallocate_files && !am_sender) {
195: rprintf(FERROR, "preallocation is not supported on this %s\n",
196: am_server ? "Server" : "Client");
197: exit_cleanup(RERR_SYNTAX);
198: }
199: #endif
200:
201: if (protocol_version < 30) {
202: if (append_mode == 1)
203: append_mode = 2;
204: if (preserve_acls && !local_server) {
205: rprintf(FERROR,
206: "--acls requires protocol 30 or higher"
207: " (negotiated %d).\n",
208: protocol_version);
209: exit_cleanup(RERR_PROTOCOL);
210: }
211: if (preserve_xattrs && !local_server) {
212: rprintf(FERROR,
213: "--xattrs requires protocol 30 or higher"
214: " (negotiated %d).\n",
215: protocol_version);
216: exit_cleanup(RERR_PROTOCOL);
217: }
218: }
219:
220: if (delete_mode && !(delete_before+delete_during+delete_after)) {
221: if (protocol_version < 30)
222: delete_before = 1;
223: else
224: delete_during = 1;
225: }
226:
227: if (protocol_version < 29) {
228: if (fuzzy_basis) {
229: rprintf(FERROR,
230: "--fuzzy requires protocol 29 or higher"
231: " (negotiated %d).\n",
232: protocol_version);
233: exit_cleanup(RERR_PROTOCOL);
234: }
235:
236: if (basis_dir_cnt && inplace) {
237: rprintf(FERROR,
238: "%s with --inplace requires protocol 29 or higher"
239: " (negotiated %d).\n",
240: dest_option, protocol_version);
241: exit_cleanup(RERR_PROTOCOL);
242: }
243:
244: if (basis_dir_cnt > 1) {
245: rprintf(FERROR,
246: "Using more than one %s option requires protocol"
247: " 29 or higher (negotiated %d).\n",
248: dest_option, protocol_version);
249: exit_cleanup(RERR_PROTOCOL);
250: }
251:
252: if (prune_empty_dirs) {
253: rprintf(FERROR,
254: "--prune-empty-dirs requires protocol 29 or higher"
255: " (negotiated %d).\n",
256: protocol_version);
257: exit_cleanup(RERR_PROTOCOL);
258: }
259: } else if (protocol_version >= 30) {
260: if (am_server) {
261: compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
262: #ifdef CAN_SET_SYMLINK_TIMES
263: compat_flags |= CF_SYMLINK_TIMES;
264: #endif
265: #ifdef ICONV_OPTION
266: compat_flags |= CF_SYMLINK_ICONV;
267: #endif
268: if (local_server || strchr(client_info, 'f') != NULL)
269: compat_flags |= CF_SAFE_FLIST;
270: write_byte(f_out, compat_flags);
271: } else
272: compat_flags = read_byte(f_in);
273: /* The inc_recurse var MUST be set to 0 or 1. */
274: inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
275: if (am_sender) {
276: receiver_symlink_times = am_server
277: ? strchr(client_info, 'L') != NULL
278: : !!(compat_flags & CF_SYMLINK_TIMES);
279: }
280: #ifdef CAN_SET_SYMLINK_TIMES
281: else
282: receiver_symlink_times = 1;
283: #endif
284: #ifdef ICONV_OPTION
285: sender_symlink_iconv = iconv_opt && (am_server
286: ? local_server || strchr(client_info, 's') != NULL
287: : !!(compat_flags & CF_SYMLINK_ICONV));
288: #endif
289: if (inc_recurse && !allow_inc_recurse) {
290: /* This should only be able to happen in a batch. */
291: fprintf(stderr,
292: "Incompatible options specified for inc-recursive %s.\n",
293: read_batch ? "batch file" : "connection");
294: exit_cleanup(RERR_SYNTAX);
295: }
296: use_safe_inc_flist = (compat_flags & CF_SAFE_FLIST) || protocol_version >= 31;
297: need_messages_from_generator = 1;
298: #ifdef CAN_SET_SYMLINK_TIMES
299: } else if (!am_sender) {
300: receiver_symlink_times = 1;
301: #endif
302: }
303:
304: if (need_unsorted_flist && (!am_sender || inc_recurse))
305: unsort_ndx = ++file_extra_cnt;
306:
307: if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
308: int rflags = FILTRULE_NO_PREFIXES | FILTRULE_DIRECTORY;
309: if (!am_sender || protocol_version >= 30)
310: rflags |= FILTRULE_PERISHABLE;
311: parse_filter_str(&filter_list, partial_dir, rule_template(rflags), 0);
312: }
313:
314:
315: #ifdef ICONV_OPTION
316: if (protect_args && files_from) {
317: if (am_sender)
318: filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
319: else
320: filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
321: }
322: #endif
323:
324: if (am_server) {
325: if (!checksum_seed)
326: checksum_seed = time(NULL);
327: write_int(f_out, checksum_seed);
328: } else {
329: checksum_seed = read_int(f_in);
330: }
331: }
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