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 3 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, see <http://www.gnu.org/licenses/>.
21 #include "system/filesys.h"
22 #include "system/select.h"
23 #include "../lib/util/select.h"
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 *ppacket, size_t length)
42 fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0644);
47 if (write(fd, ppacket, length) != length) {
48 fprintf(stderr,"Failed to write %s\n", fname);
53 printf("Wrote %ld bytes to %s\n", (unsigned long)length, fname);
56 static void filter_reply(char *buf)
58 int msg_type = CVAL(buf,0);
59 int type = CVAL(buf,smb_com);
67 /* force the security bits */
68 x = CVAL(buf, smb_vwv1);
69 x = (x | SECURITY_SET) & ~SECURITY_MASK;
70 SCVAL(buf, smb_vwv1, x);
72 /* force the capabilities */
73 x = IVAL(buf,smb_vwv9+1);
74 x = (x | CAPABILITY_SET) & ~CAPABILITY_MASK;
75 SIVAL(buf, smb_vwv9+1, x);
81 static void filter_request(char *buf, size_t buf_len)
83 int msg_type = CVAL(buf,0);
84 int type = CVAL(buf,smb_com);
87 int name_len1, name_len2;
88 int name_type1, name_type2;
91 /* it's a netbios special */
95 /* inbuf_size is guaranteed to be at least 4. */
96 name_len1 = name_len((unsigned char *)(buf+4),
98 if (name_len1 <= 0 || name_len1 > buf_len - 4) {
99 DEBUG(0,("Invalid name length in session request\n"));
102 name_len2 = name_len((unsigned char *)(buf+4+name_len1),
103 buf_len - 4 - name_len1);
104 if (name_len2 <= 0 || name_len2 > buf_len - 4 - name_len1) {
105 DEBUG(0,("Invalid name length in session request\n"));
109 name_type1 = name_extract((unsigned char *)buf,
110 buf_len,(unsigned int)4,name1);
111 name_type2 = name_extract((unsigned char *)buf,
112 buf_len,(unsigned int)(4 + name_len1),name2);
114 if (name_type1 == -1 || name_type2 == -1) {
115 DEBUG(0,("Invalid name type in session request\n"));
119 d_printf("sesion_request: %s -> %s\n",
122 char *mangled = name_mangle(
123 talloc_tos(), netbiosname, 0x20);
124 if (mangled != NULL) {
125 /* replace the destination netbios
127 memcpy(buf+4, mangled,
128 name_len((unsigned char *)mangled,
129 talloc_get_size(mangled)));
130 TALLOC_FREE(mangled);
136 /* it's an ordinary SMB request */
139 /* force the client capabilities */
140 x = IVAL(buf,smb_vwv11);
141 d_printf("SMBsesssetupX cap=0x%08x\n", x);
142 d_printf("pwlen=%d/%d\n", SVAL(buf, smb_vwv7), SVAL(buf, smb_vwv8));
143 system("mv sessionsetup.dat sessionsetup1.dat");
144 save_file("sessionsetup.dat", smb_buf(buf), SVAL(buf, smb_vwv7));
145 x = (x | CLI_CAPABILITY_SET) & ~CLI_CAPABILITY_MASK;
146 SIVAL(buf, smb_vwv11, x);
151 /****************************************************************************
153 ****************************************************************************/
155 static bool send_smb(int fd, char *buffer)
161 len = smb_len(buffer) + 4;
163 while (nwritten < len) {
164 ret = write_data(fd,buffer+nwritten,len - nwritten);
166 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
167 (int)len,(int)ret, strerror(errno) ));
176 static void filter_child(int c, struct sockaddr_storage *dest_ss)
181 /* we have a connection from a new client, now connect to the server */
182 status = open_socket_out(dest_ss, 445, LONG_CONNECT_TIMEOUT, &s);
185 char addr[INET6_ADDRSTRLEN];
187 print_sockaddr(addr, sizeof(addr), dest_ss);
190 d_printf("Unable to connect to %s (%s)\n",
191 dest_ss?addr:"NULL",strerror(errno));
195 while (c != -1 || s != -1) {
196 struct pollfd fds[2];
199 memset(fds, 0, sizeof(struct pollfd) * 2);
206 fds[num_fds].events = POLLIN|POLLHUP;
211 fds[num_fds].events = POLLIN|POLLHUP;
215 ret = sys_poll_intr(fds, num_fds, -1);
221 * find c in fds and see if it's readable
225 && (fds[0].revents & (POLLIN|POLLHUP|POLLERR))) ||
227 && (fds[1].revents & (POLLIN|POLLHUP|POLLERR))))) {
229 if (!NT_STATUS_IS_OK(receive_smb_raw(
230 c, packet, sizeof(packet),
232 d_printf("client closed connection\n");
235 filter_request(packet, len);
236 if (!send_smb(s, packet)) {
237 d_printf("server is dead\n");
243 * find s in fds and see if it's readable
247 && (fds[0].revents & (POLLIN|POLLHUP|POLLERR))) ||
249 && (fds[1].revents & (POLLIN|POLLHUP|POLLERR))))) {
251 if (!NT_STATUS_IS_OK(receive_smb_raw(
252 s, packet, sizeof(packet),
254 d_printf("server closed connection\n");
257 filter_reply(packet);
258 if (!send_smb(c, packet)) {
259 d_printf("client is dead\n");
264 d_printf("Connection closed\n");
269 static void start_filter(char *desthost)
272 struct sockaddr_storage dest_ss;
273 struct sockaddr_storage my_ss;
277 /* start listening on port 445 locally */
279 zero_sockaddr(&my_ss);
280 s = open_socket_in(SOCK_STREAM, 445, 0, &my_ss, True);
283 d_printf("bind failed\n");
287 if (listen(s, 5) == -1) {
288 d_printf("listen failed\n");
291 if (!resolve_name(desthost, &dest_ss, 0x20, false)) {
292 d_printf("Unable to resolve host %s\n", desthost);
298 struct sockaddr_storage ss;
299 socklen_t in_addrlen = sizeof(ss);
301 num = poll_intr_one_fd(s, POLLIN|POLLHUP, -1, &revents);
302 if ((num > 0) && (revents & (POLLIN|POLLHUP|POLLERR))) {
303 c = accept(s, (struct sockaddr *)&ss, &in_addrlen);
307 filter_child(c, &dest_ss);
318 int main(int argc, char *argv[])
321 const char *configfile;
322 TALLOC_CTX *frame = talloc_stackframe();
326 setup_logging(argv[0], DEBUG_STDOUT);
328 configfile = get_dyn_CONFIGFILE();
331 fprintf(stderr,"smbfilter <desthost> <netbiosname>\n");
337 netbiosname = argv[2];
340 if (!lp_load(configfile,True,False,False,True)) {
341 d_printf("Unable to load config file\n");
344 start_filter(desthost);