2 Unix SMB/Netbios implementation.
4 SMB filter/socket plugin
5 Copyright (C) Andrew Tridgell 1999
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #define SECURITY_MASK 0
26 #define SECURITY_SET 0
28 /* this forces non-unicode */
29 #define CAPABILITY_MASK 0
30 #define CAPABILITY_SET 0
32 /* and non-unicode for the client too */
33 #define CLI_CAPABILITY_MASK 0
34 #define CLI_CAPABILITY_SET 0
36 static char *netbiosname
;
37 static char packet
[BUFFER_SIZE
];
39 static void save_file(const char *fname
, void *packet
, size_t length
)
42 fd
= open(fname
, O_WRONLY
|O_CREAT
|O_TRUNC
, 0644);
47 if (write(fd
, packet
, length
) != length
) {
48 fprintf(stderr
,"Failed to write %s\n", fname
);
52 printf("Wrote %d bytes to %s\n", length
, fname
);
55 static void filter_reply(char *buf
)
57 int msg_type
= CVAL(buf
,0);
58 int type
= CVAL(buf
,smb_com
);
66 /* force the security bits */
67 x
= CVAL(buf
, smb_vwv1
);
68 x
= (x
| SECURITY_SET
) & ~SECURITY_MASK
;
69 SCVAL(buf
, smb_vwv1
, x
);
71 /* force the capabilities */
72 x
= IVAL(buf
,smb_vwv9
+1);
73 x
= (x
| CAPABILITY_SET
) & ~CAPABILITY_MASK
;
74 SIVAL(buf
, smb_vwv9
+1, x
);
80 static void filter_request(char *buf
)
82 int msg_type
= CVAL(buf
,0);
83 int type
= CVAL(buf
,smb_com
);
88 /* it's a netbios special */
92 name_extract(buf
,4,name1
);
93 name_extract(buf
,4 + name_len(buf
+ 4),name2
);
94 d_printf("sesion_request: %s -> %s\n",
97 /* replace the destination netbios name */
98 name_mangle(netbiosname
, buf
+4, 0x20);
104 /* it's an ordinary SMB request */
107 /* force the client capabilities */
108 x
= IVAL(buf
,smb_vwv11
);
109 d_printf("SMBsesssetupX cap=0x%08x\n", x
);
110 d_printf("pwlen=%d/%d\n", SVAL(buf
, smb_vwv7
), SVAL(buf
, smb_vwv8
));
111 system("mv sessionsetup.dat sessionsetup1.dat");
112 save_file("sessionsetup.dat", smb_buf(buf
), SVAL(buf
, smb_vwv7
));
113 x
= (x
| CLI_CAPABILITY_SET
) & ~CLI_CAPABILITY_MASK
;
114 SIVAL(buf
, smb_vwv11
, x
);
121 static void filter_child(int c
, struct in_addr dest_ip
)
125 /* we have a connection from a new client, now connect to the server */
126 s
= open_socket_out(SOCK_STREAM
, &dest_ip
, 445, LONG_CONNECT_TIMEOUT
);
129 d_printf("Unable to connect to %s\n", inet_ntoa(dest_ip
));
133 while (c
!= -1 || s
!= -1) {
138 if (s
!= -1) FD_SET(s
, &fds
);
139 if (c
!= -1) FD_SET(c
, &fds
);
141 num
= sys_select_intr(MAX(s
+1, c
+1),&fds
,NULL
);
142 if (num
<= 0) continue;
144 if (c
!= -1 && FD_ISSET(c
, &fds
)) {
145 if (!receive_smb(c
, packet
, 0)) {
146 d_printf("client closed connection\n");
149 filter_request(packet
);
150 if (!send_smb(s
, packet
)) {
151 d_printf("server is dead\n");
155 if (s
!= -1 && FD_ISSET(s
, &fds
)) {
156 if (!receive_smb(s
, packet
, 0)) {
157 d_printf("server closed connection\n");
160 filter_reply(packet
);
161 if (!send_smb(c
, packet
)) {
162 d_printf("client is dead\n");
167 d_printf("Connection closed\n");
172 static void start_filter(char *desthost
)
175 struct in_addr dest_ip
;
179 /* start listening on port 445 locally */
180 s
= open_socket_in(SOCK_STREAM
, 445, 0, 0, True
);
183 d_printf("bind failed\n");
187 if (listen(s
, 5) == -1) {
188 d_printf("listen failed\n");
191 if (!resolve_name(desthost
, &dest_ip
, 0x20)) {
192 d_printf("Unable to resolve host %s\n", desthost
);
199 struct sockaddr addr
;
200 socklen_t in_addrlen
= sizeof(addr
);
205 num
= sys_select_intr(s
+1,&fds
,NULL
);
207 c
= accept(s
, &addr
, &in_addrlen
);
211 filter_child(c
, dest_ip
);
222 int main(int argc
, char *argv
[])
227 setup_logging(argv
[0],True
);
229 pstrcpy(configfile
,dyn_CONFIGFILE
);
232 fprintf(stderr
,"smbfilter <desthost> <netbiosname>\n");
238 netbiosname
= argv
[2];
241 if (!lp_load(configfile
,True
,False
,False
)) {
242 d_printf("Unable to load config file\n");
245 start_filter(desthost
);