1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/*
* Expand msdfs targets based on client IP
*
* Copyright (C) Volker Lendecke, 2004
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_VFS
extern userdom_struct current_user_info;
/**********************************************************
Under mapfile we expect a table of the following format:
IP-Prefix whitespace expansion
For example:
192.168.234 local.samba.org
192.168 remote.samba.org
default.samba.org
This is to redirect a DFS client to a host close to it.
***********************************************************/
static bool read_target_host(const char *mapfile, pstring targethost)
{
XFILE *f;
pstring buf;
char *space = buf;
bool found = False;
f = x_fopen(mapfile, O_RDONLY, 0);
if (f == NULL) {
DEBUG(0,("can't open IP map %s. Error %s\n",
mapfile, strerror(errno) ));
return False;
}
DEBUG(10, ("Scanning mapfile [%s]\n", mapfile));
while (x_fgets(buf, sizeof(buf), f) != NULL) {
if ((strlen(buf) > 0) && (buf[strlen(buf)-1] == '\n'))
buf[strlen(buf)-1] = '\0';
DEBUG(10, ("Scanning line [%s]\n", buf));
space = strchr_m(buf, ' ');
if (space == NULL) {
DEBUG(0, ("Ignoring invalid line %s\n", buf));
continue;
}
*space = '\0';
if (strncmp(client_addr(), buf, strlen(buf)) == 0) {
found = True;
break;
}
}
x_fclose(f);
if (!found)
return False;
space += 1;
while (isspace(*space))
space += 1;
pstrcpy(targethost, space);
return True;
}
/**********************************************************
Expand the msdfs target host using read_target_host
explained above. The syntax used in the msdfs link is
msdfs:@table-filename@/share
Everything between and including the two @-signs is
replaced by the substitution string found in the table
described above.
***********************************************************/
static bool expand_msdfs_target(connection_struct* conn, pstring target)
{
pstring mapfilename;
char *filename_start = strchr_m(target, '@');
char *filename_end;
int filename_len;
pstring targethost;
pstring new_target;
if (filename_start == NULL) {
DEBUG(10, ("No filename start in %s\n", target));
return False;
}
filename_end = strchr_m(filename_start+1, '@');
if (filename_end == NULL) {
DEBUG(10, ("No filename end in %s\n", target));
return False;
}
filename_len = PTR_DIFF(filename_end, filename_start+1);
pstrcpy(mapfilename, filename_start+1);
mapfilename[filename_len] = '\0';
DEBUG(10, ("Expanding from table [%s]\n", mapfilename));
if (!read_target_host(mapfilename, targethost)) {
DEBUG(1, ("Could not expand target host from file %s\n",
mapfilename));
return False;
}
standard_sub_advanced(lp_servicename(SNUM(conn)), conn->user,
conn->connectpath, conn->gid,
get_current_username(),
current_user_info.domain,
mapfilename, sizeof(mapfilename));
DEBUG(10, ("Expanded targethost to %s\n", targethost));
*filename_start = '\0';
pstrcpy(new_target, target);
pstrcat(new_target, targethost);
pstrcat(new_target, filename_end+1);
DEBUG(10, ("New DFS target: %s\n", new_target));
pstrcpy(target, new_target);
return True;
}
static int expand_msdfs_readlink(struct vfs_handle_struct *handle,
const char *path, char *buf, size_t bufsiz)
{
pstring target;
int result;
result = SMB_VFS_NEXT_READLINK(handle, path, target,
sizeof(target));
if (result < 0)
return result;
target[result] = '\0';
if ((strncmp(target, "msdfs:", strlen("msdfs:")) == 0) &&
(strchr_m(target, '@') != NULL)) {
if (!expand_msdfs_target(handle->conn, target)) {
errno = ENOENT;
return -1;
}
}
safe_strcpy(buf, target, bufsiz-1);
return strlen(buf);
}
/* VFS operations structure */
static vfs_op_tuple expand_msdfs_ops[] = {
{SMB_VFS_OP(expand_msdfs_readlink), SMB_VFS_OP_READLINK,
SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
};
NTSTATUS vfs_expand_msdfs_init(void);
NTSTATUS vfs_expand_msdfs_init(void)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "expand_msdfs",
expand_msdfs_ops);
}
|
