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"
24 #include "libsmb/nmblib.h"
26 #define SECURITY_MASK 0
27 #define SECURITY_SET 0
29 /* this forces non-unicode */
30 #define CAPABILITY_MASK 0
31 #define CAPABILITY_SET 0
33 /* and non-unicode for the client too */
34 #define CLI_CAPABILITY_MASK 0
35 #define CLI_CAPABILITY_SET 0
37 static char *netbiosname;
38 static char packet[BUFFER_SIZE];
40 static void save_file(const char *fname, void *ppacket, size_t length)
43 fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0644);
48 if (write(fd, ppacket, length) != length) {
49 fprintf(stderr,"Failed to write %s\n", fname);
54 printf("Wrote %ld bytes to %s\n", (unsigned long)length, fname);
57 static void filter_reply(char *buf)
59 int msg_type = CVAL(buf,0);
60 int type = CVAL(buf,smb_com);
68 /* force the security bits */
69 x = CVAL(buf, smb_vwv1);
70 x = (x | SECURITY_SET) & ~SECURITY_MASK;
71 SCVAL(buf, smb_vwv1, x);
73 /* force the capabilities */
74 x = IVAL(buf,smb_vwv9+1);
75 x = (x | CAPABILITY_SET) & ~CAPABILITY_MASK;
76 SIVAL(buf, smb_vwv9+1, x);
82 static void filter_request(char *buf, size_t buf_len)
84 int msg_type = CVAL(buf,0);
85 int type = CVAL(buf,smb_com);
88 int name_len1, name_len2;
89 int name_type1, name_type2;
92 /* it's a netbios special */
96 /* inbuf_size is guaranteed to be at least 4. */
97 name_len1 = name_len((unsigned char *)(buf+4),
99 if (name_len1 <= 0 || name_len1 > buf_len - 4) {
100 DEBUG(0,("Invalid name length in session request\n"));
103 name_len2 = name_len((unsigned char *)(buf+4+name_len1),
104 buf_len - 4 - name_len1);
105 if (name_len2 <= 0 || name_len2 > buf_len - 4 - name_len1) {
106 DEBUG(0,("Invalid name length in session request\n"));
110 name_type1 = name_extract((unsigned char *)buf,
111 buf_len,(unsigned int)4,name1);
112 name_type2 = name_extract((unsigned char *)buf,
113 buf_len,(unsigned int)(4 + name_len1),name2);
115 if (name_type1 == -1 || name_type2 == -1) {
116 DEBUG(0,("Invalid name type in session request\n"));
120 d_printf("sesion_request: %s -> %s\n",
123 char *mangled = name_mangle(
124 talloc_tos(), netbiosname, 0x20);
125 if (mangled != NULL) {
126 /* replace the destination netbios
128 memcpy(buf+4, mangled,
129 name_len((unsigned char *)mangled,
130 talloc_get_size(mangled)));
131 TALLOC_FREE(mangled);
137 /* it's an ordinary SMB request */
140 /* force the client capabilities */
141 x = IVAL(buf,smb_vwv11);
142 d_printf("SMBsesssetupX cap=0x%08x\n", x);
143 d_printf("pwlen=%d/%d\n", SVAL(buf, smb_vwv7), SVAL(buf, smb_vwv8));
144 system("mv sessionsetup.dat sessionsetup1.dat");
145 save_file("sessionsetup.dat", smb_buf(buf), SVAL(buf, smb_vwv7));
146 x = (x | CLI_CAPABILITY_SET) & ~CLI_CAPABILITY_MASK;
147 SIVAL(buf, smb_vwv11, x);
152 /****************************************************************************
154 ****************************************************************************/
156 static bool send_smb(int fd, char *buffer)
162 len = smb_len(buffer) + 4;
164 while (nwritten < len) {
165 ret = write_data(fd,buffer+nwritten,len - nwritten);
167 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
168 (int)len,(int)ret, strerror(errno) ));
177 static void filter_child(int c, struct sockaddr_storage *dest_ss)
182 /* we have a connection from a new client, now connect to the server */
183 status = open_socket_out(dest_ss, TCP_SMB_PORT, LONG_CONNECT_TIMEOUT, &s);
186 char addr[INET6_ADDRSTRLEN];
188 print_sockaddr(addr, sizeof(addr), dest_ss);
191 d_printf("Unable to connect to %s (%s)\n",
192 dest_ss?addr:"NULL",strerror(errno));
196 while (c != -1 || s != -1) {
197 struct pollfd fds[2];
200 memset(fds, 0, sizeof(struct pollfd) * 2);
207 fds[num_fds].events = POLLIN|POLLHUP;
212 fds[num_fds].events = POLLIN|POLLHUP;
216 ret = sys_poll_intr(fds, num_fds, -1);
222 * find c in fds and see if it's readable
226 && (fds[0].revents & (POLLIN|POLLHUP|POLLERR))) ||
228 && (fds[1].revents & (POLLIN|POLLHUP|POLLERR))))) {
230 if (!NT_STATUS_IS_OK(receive_smb_raw(
231 c, packet, sizeof(packet),
233 d_printf("client closed connection\n");
236 filter_request(packet, len);
237 if (!send_smb(s, packet)) {
238 d_printf("server is dead\n");
244 * find s in fds and see if it's readable
248 && (fds[0].revents & (POLLIN|POLLHUP|POLLERR))) ||
250 && (fds[1].revents & (POLLIN|POLLHUP|POLLERR))))) {
252 if (!NT_STATUS_IS_OK(receive_smb_raw(
253 s, packet, sizeof(packet),
255 d_printf("server closed connection\n");
258 filter_reply(packet);
259 if (!send_smb(c, packet)) {
260 d_printf("client is dead\n");
265 d_printf("Connection closed\n");
270 static void start_filter(char *desthost)
273 struct sockaddr_storage dest_ss;
274 struct sockaddr_storage my_ss;
278 /* start listening on port 445 locally */
280 zero_sockaddr(&my_ss);
281 s = open_socket_in(SOCK_STREAM, TCP_SMB_PORT, 0, &my_ss, True);
284 d_printf("bind failed\n");
288 if (listen(s, 5) == -1) {
289 d_printf("listen failed\n");
292 if (!resolve_name(desthost, &dest_ss, 0x20, false)) {
293 d_printf("Unable to resolve host %s\n", desthost);
299 struct sockaddr_storage ss;
300 socklen_t in_addrlen = sizeof(ss);
302 num = poll_intr_one_fd(s, POLLIN|POLLHUP, -1, &revents);
303 if ((num > 0) && (revents & (POLLIN|POLLHUP|POLLERR))) {
304 c = accept(s, (struct sockaddr *)&ss, &in_addrlen);
308 filter_child(c, &dest_ss);
319 int main(int argc, char *argv[])
322 const char *configfile;
323 TALLOC_CTX *frame = talloc_stackframe();
327 setup_logging(argv[0], DEBUG_STDOUT);
329 configfile = get_dyn_CONFIGFILE();
332 fprintf(stderr,"smbfilter <desthost> <netbiosname>\n");
338 netbiosname = argv[2];
341 if (!lp_load_global(configfile)) {
342 d_printf("Unable to load config file\n");
345 start_filter(desthost);