We enforce at least protocol 29 for --prune-empty-dirs because the
[rsync/rsync.git] / compat.c
1 /* 
2    Copyright (C) Andrew Tridgell 1996
3    Copyright (C) Paul Mackerras 1996
4    
5    This program is free software; you can redistribute it and/or modify
6    it under the terms of the GNU General Public License as published by
7    the Free Software Foundation; either version 2 of the License, or
8    (at your option) any later version.
9    
10    This program is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13    GNU General Public License for more details.
14    
15    You should have received a copy of the GNU General Public License
16    along with this program; if not, write to the Free Software
17    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20 /**
21  * @file compat.c
22  *
23  * Compatibility routines for older rsync protocol versions.
24  **/
25
26 #include "rsync.h"
27
28 int remote_protocol = 0;
29
30 extern int verbose;
31 extern int am_server;
32 extern int am_sender;
33 extern int inplace;
34 extern int fuzzy_basis;
35 extern int read_batch;
36 extern int checksum_seed;
37 extern int basis_dir_cnt;
38 extern int prune_empty_dirs;
39 extern int protocol_version;
40 extern char *dest_option;
41
42 void setup_protocol(int f_out,int f_in)
43 {
44         if (remote_protocol == 0) {
45                 if (!read_batch)
46                         write_int(f_out, protocol_version);
47                 remote_protocol = read_int(f_in);
48                 if (protocol_version > remote_protocol)
49                         protocol_version = remote_protocol;
50         }
51         if (read_batch && remote_protocol > protocol_version) {
52                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
53                         remote_protocol, protocol_version);
54                 exit_cleanup(RERR_PROTOCOL);
55         }
56
57         if (verbose > 3) {
58                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
59                         am_server? "Server" : "Client", remote_protocol, protocol_version);
60         }
61         if (remote_protocol < MIN_PROTOCOL_VERSION
62          || remote_protocol > MAX_PROTOCOL_VERSION) {
63                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
64                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
65                 exit_cleanup(RERR_PROTOCOL);
66         }
67         if (remote_protocol < OLD_PROTOCOL_VERSION) {
68                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
69                         am_server? "Client" : "Server");
70         }
71         if (protocol_version < MIN_PROTOCOL_VERSION) {
72                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
73                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
74                 exit_cleanup(RERR_PROTOCOL);
75         }
76         if (protocol_version > PROTOCOL_VERSION) {
77                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
78                         PROTOCOL_VERSION, am_server? "Server" : "Client");
79                 exit_cleanup(RERR_PROTOCOL);
80         }
81
82         if (protocol_version < 29) {
83                 if (fuzzy_basis) {
84                         rprintf(FERROR,
85                             "--fuzzy requires protocol 29 or higher"
86                             " (negotiated %d).\n",
87                             protocol_version);
88                         exit_cleanup(RERR_PROTOCOL);
89                 }
90
91                 if (basis_dir_cnt && inplace) {
92                         rprintf(FERROR,
93                             "%s with --inplace requires protocol 29 or higher"
94                             " (negotiated %d).\n",
95                             dest_option, protocol_version);
96                         exit_cleanup(RERR_PROTOCOL);
97                 }
98
99                 if (basis_dir_cnt > 1) {
100                         rprintf(FERROR,
101                             "Using more than one %s option requires protocol"
102                             " 29 or higher (negotiated %d).\n",
103                             dest_option, protocol_version);
104                         exit_cleanup(RERR_PROTOCOL);
105                 }
106
107                 if (prune_empty_dirs) {
108                         rprintf(FERROR,
109                             "--prune-empty-dirs requires protocol 29 or higher"
110                             " (negotiated %d).\n",
111                             protocol_version);
112                         exit_cleanup(RERR_PROTOCOL);
113                 }
114         }
115
116         if (am_server) {
117                 if (!checksum_seed)
118                         checksum_seed = time(NULL);
119                 write_int(f_out, checksum_seed);
120         } else {
121                 checksum_seed = read_int(f_in);
122         }
123 }