2 Unix SMB/CIFS implementation.
3 SMB filter/socket plugin
4 Copyright (C) Andrew Tridgell 1999
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #define SECURITY_MASK 0
24 #define SECURITY_SET 0
26 /* this forces non-unicode */
27 #define CAPABILITY_MASK 0
28 #define CAPABILITY_SET 0
30 /* and non-unicode for the client too */
31 #define CLI_CAPABILITY_MASK 0
32 #define CLI_CAPABILITY_SET 0
34 static char *netbiosname;
35 static char packet[BUFFER_SIZE];
37 static void save_file(const char *fname, void *packet, size_t length)
40 fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0644);
45 if (write(fd, packet, length) != length) {
46 fprintf(stderr,"Failed to write %s\n", fname);
50 printf("Wrote %d bytes to %s\n", length, fname);
53 static void filter_reply(char *buf)
55 int msg_type = CVAL(buf,0);
56 int type = CVAL(buf,smb_com);
64 /* force the security bits */
65 x = CVAL(buf, smb_vwv1);
66 x = (x | SECURITY_SET) & ~SECURITY_MASK;
67 SCVAL(buf, smb_vwv1, x);
69 /* force the capabilities */
70 x = IVAL(buf,smb_vwv9+1);
71 x = (x | CAPABILITY_SET) & ~CAPABILITY_MASK;
72 SIVAL(buf, smb_vwv9+1, x);
78 static void filter_request(char *buf)
80 int msg_type = CVAL(buf,0);
81 int type = CVAL(buf,smb_com);
86 /* it's a netbios special */
90 name_extract(buf,4,name1);
91 name_extract(buf,4 + name_len(buf + 4),name2);
92 d_printf("sesion_request: %s -> %s\n",
95 /* replace the destination netbios name */
96 name_mangle(netbiosname, buf+4, 0x20);
102 /* it's an ordinary SMB request */
105 /* force the client capabilities */
106 x = IVAL(buf,smb_vwv11);
107 d_printf("SMBsesssetupX cap=0x%08x\n", x);
108 d_printf("pwlen=%d/%d\n", SVAL(buf, smb_vwv7), SVAL(buf, smb_vwv8));
109 system("mv sessionsetup.dat sessionsetup1.dat");
110 save_file("sessionsetup.dat", smb_buf(buf), SVAL(buf, smb_vwv7));
111 x = (x | CLI_CAPABILITY_SET) & ~CLI_CAPABILITY_MASK;
112 SIVAL(buf, smb_vwv11, x);
119 static void filter_child(int c, struct in_addr dest_ip)
123 /* we have a connection from a new client, now connect to the server */
124 s = open_socket_out(SOCK_STREAM, &dest_ip, 445, LONG_CONNECT_TIMEOUT);
127 d_printf("Unable to connect to %s\n", inet_ntoa(dest_ip));
131 while (c != -1 || s != -1) {
136 if (s != -1) FD_SET(s, &fds);
137 if (c != -1) FD_SET(c, &fds);
139 num = sys_select_intr(MAX(s+1, c+1),&fds,NULL,NULL,NULL);
140 if (num <= 0) continue;
142 if (c != -1 && FD_ISSET(c, &fds)) {
143 if (!receive_smb(c, packet, 0)) {
144 d_printf("client closed connection\n");
147 filter_request(packet);
148 if (!send_smb(s, packet)) {
149 d_printf("server is dead\n");
153 if (s != -1 && FD_ISSET(s, &fds)) {
154 if (!receive_smb(s, packet, 0)) {
155 d_printf("server closed connection\n");
158 filter_reply(packet);
159 if (!send_smb(c, packet)) {
160 d_printf("client is dead\n");
165 d_printf("Connection closed\n");
170 static void start_filter(char *desthost)
173 struct in_addr dest_ip;
177 /* start listening on port 445 locally */
178 s = open_socket_in(SOCK_STREAM, 445, 0, 0, True);
181 d_printf("bind failed\n");
185 if (listen(s, 5) == -1) {
186 d_printf("listen failed\n");
189 if (!resolve_name(desthost, &dest_ip, 0x20)) {
190 d_printf("Unable to resolve host %s\n", desthost);
197 struct sockaddr addr;
198 socklen_t in_addrlen = sizeof(addr);
203 num = sys_select_intr(s+1,&fds,NULL,NULL,NULL);
205 c = accept(s, &addr, &in_addrlen);
209 filter_child(c, dest_ip);
220 int main(int argc, char *argv[])
225 setup_logging(argv[0],True);
227 pstrcpy(configfile,dyn_CONFIGFILE);
230 fprintf(stderr,"smbfilter <desthost> <netbiosname>\n");
236 netbiosname = argv[2];
239 if (!lp_load(configfile,True,False,False)) {
240 d_printf("Unable to load config file\n");
243 start_filter(desthost);