Got rid of unused externs.
[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 inplace;
33 extern int fuzzy_basis;
34 extern int read_batch;
35 extern int checksum_seed;
36 extern int basis_dir_cnt;
37 extern int prune_empty_dirs;
38 extern int protocol_version;
39 extern char *dest_option;
40
41 void setup_protocol(int f_out,int f_in)
42 {
43         if (remote_protocol == 0) {
44                 if (!read_batch)
45                         write_int(f_out, protocol_version);
46                 remote_protocol = read_int(f_in);
47                 if (protocol_version > remote_protocol)
48                         protocol_version = remote_protocol;
49         }
50         if (read_batch && remote_protocol > protocol_version) {
51                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
52                         remote_protocol, protocol_version);
53                 exit_cleanup(RERR_PROTOCOL);
54         }
55
56         if (verbose > 3) {
57                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
58                         am_server? "Server" : "Client", remote_protocol, protocol_version);
59         }
60         if (remote_protocol < MIN_PROTOCOL_VERSION
61          || remote_protocol > MAX_PROTOCOL_VERSION) {
62                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
63                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
64                 exit_cleanup(RERR_PROTOCOL);
65         }
66         if (remote_protocol < OLD_PROTOCOL_VERSION) {
67                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
68                         am_server? "Client" : "Server");
69         }
70         if (protocol_version < MIN_PROTOCOL_VERSION) {
71                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
72                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
73                 exit_cleanup(RERR_PROTOCOL);
74         }
75         if (protocol_version > PROTOCOL_VERSION) {
76                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
77                         PROTOCOL_VERSION, am_server? "Server" : "Client");
78                 exit_cleanup(RERR_PROTOCOL);
79         }
80
81         if (protocol_version < 29) {
82                 if (fuzzy_basis) {
83                         rprintf(FERROR,
84                             "--fuzzy requires protocol 29 or higher"
85                             " (negotiated %d).\n",
86                             protocol_version);
87                         exit_cleanup(RERR_PROTOCOL);
88                 }
89
90                 if (basis_dir_cnt && inplace) {
91                         rprintf(FERROR,
92                             "%s with --inplace requires protocol 29 or higher"
93                             " (negotiated %d).\n",
94                             dest_option, protocol_version);
95                         exit_cleanup(RERR_PROTOCOL);
96                 }
97
98                 if (basis_dir_cnt > 1) {
99                         rprintf(FERROR,
100                             "Using more than one %s option requires protocol"
101                             " 29 or higher (negotiated %d).\n",
102                             dest_option, protocol_version);
103                         exit_cleanup(RERR_PROTOCOL);
104                 }
105
106                 if (prune_empty_dirs) {
107                         rprintf(FERROR,
108                             "--prune-empty-dirs requires protocol 29 or higher"
109                             " (negotiated %d).\n",
110                             protocol_version);
111                         exit_cleanup(RERR_PROTOCOL);
112                 }
113         }
114
115         if (am_server) {
116                 if (!checksum_seed)
117                         checksum_seed = time(NULL);
118                 write_int(f_out, checksum_seed);
119         } else {
120                 checksum_seed = read_int(f_in);
121         }
122 }