damn, new files need to be added to the head branch first, I've told

other people this before then forgot myself :)

source/Makefile.in

@@ -270,6 +270,9 @@ DEBUG2HTML_OBJ = utils/debug2html.o $(PARAM_OBJ) $(LIB_OBJ)
 SMBTORTURE_OBJ = utils/torture.o $(LIBSMB_OBJ) $(PARAM_OBJ) \
                  $(UBIQX_OBJ) $(LIB_OBJ)
 
+SMBFILTER_OBJ = utils/filter.o $(LIBSMB_OBJ) $(PARAM_OBJ) \
+                 $(UBIQX_OBJ) $(LIB_OBJ)
+
 RPCTORTURE_OBJ = utils/rpctorture.o \
              rpcclient/display.o \
              rpcclient/cmd_lsarpc.o \
@@ -299,6 +302,9 @@ smbtorture : CHECK bin/smbtorture
 
 rpctorture : CHECK bin/rpctorture
 
+smbfilter : CHECK bin/smbfilter
+
+
 .SUFFIXES:
 .SUFFIXES: .c .o .po .po32
 
@@ -436,6 +442,10 @@ bin/rpctorture: $(RPCTORTURE_OBJ) bin/.dummy
 	@echo Linking $@
 	@$(CC) $(FLAGS) -o $@ $(RPCTORTURE_OBJ) $(LDFLAGS) $(LIBS)
 
+bin/smbfilter: $(SMBFILTER_OBJ) bin/.dummy
+	@echo Linking $@
+	@$(CC) $(FLAGS) -o $@ $(SMBFILTER_OBJ) $(LDFLAGS) $(LIBS)
+
 bin/debug2html: $(DEBUG2HTML_OBJ) bin/.dummy
 	@echo Linking $@
 	@$(CC) $(FLAGS) -o $@ $(DEBUG2HTML_OBJ) $(LDFLAGS) $(LIBS)

source/utils/smbfilter.c

@@ -0,0 +1,233 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 2
+   SMB filter/socket plugin
+   Copyright (C) Andrew Tridgell 1999
+   
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "smb.h"
+
+#define SECURITY_MASK 0
+#define SECURITY_SET  0
+
+/* this forces non-unicode */
+#define CAPABILITY_MASK CAP_UNICODE
+#define CAPABILITY_SET  0
+
+/* and non-unicode for the client too */
+#define CLI_CAPABILITY_MASK CAP_UNICODE
+#define CLI_CAPABILITY_SET  0
+
+static char *netbiosname;
+static char packet[BUFFER_SIZE];
+
+extern int DEBUGLEVEL;
+
+static void filter_reply(char *buf)
+{
+	int msg_type = CVAL(buf,0);
+	int type = CVAL(buf,smb_com);
+	unsigned x;
+
+	if (msg_type) return;
+
+	switch (type) {
+
+	case SMBnegprot:
+		/* force the security bits */
+		x = CVAL(buf, smb_vwv1);
+		x = (x | SECURITY_SET) & ~SECURITY_MASK;
+		SCVAL(buf, smb_vwv1, x);
+
+		/* force the capabilities */
+		x = IVAL(buf,smb_vwv9+1);
+		x = (x | CAPABILITY_SET) & ~CAPABILITY_MASK;
+		SIVAL(buf, smb_vwv9+1, x);
+		break;
+
+	}
+}
+
+static void filter_request(char *buf)
+{
+	int msg_type = CVAL(buf,0);
+	int type = CVAL(buf,smb_com);
+	pstring name1,name2;
+	unsigned x;
+
+	if (msg_type) {
+		/* it's a netbios special */
+		switch (msg_type) {
+		case 0x81:
+			/* session request */
+			name_extract(buf,4,name1);
+			name_extract(buf,4 + name_len(buf + 4),name2);
+			DEBUG(0,("sesion_request: %s -> %s\n",
+				 name1, name2));
+			if (netbiosname) {
+				/* replace the destination netbios name */
+				name_mangle(netbiosname, buf+4, 0x20);
+			}
+		}
+		return;
+	}
+
+	/* it's an ordinary SMB request */
+	switch (type) {
+	case SMBsesssetupX:
+		/* force the client capabilities */
+		x = IVAL(buf,smb_vwv11);
+		x = (x | CLI_CAPABILITY_SET) & ~CLI_CAPABILITY_MASK;
+		SIVAL(buf, smb_vwv11, x);
+		break;
+	}
+
+}
+
+
+static void filter_child(int c, struct in_addr dest_ip)
+{
+	int s;
+
+	/* we have a connection from a new client, now connect to the server */
+	s = open_socket_out(SOCK_STREAM, &dest_ip, 139, LONG_CONNECT_TIMEOUT);
+
+	if (s == -1) {
+		DEBUG(0,("Unable to connect to %s\n", inet_ntoa(dest_ip)));
+		exit(1);
+	}
+
+	while (c != -1 || s != -1) {
+		fd_set fds;
+		int num;
+		
+		FD_ZERO(&fds);
+		if (s != -1) FD_SET(s, &fds);
+		if (c != -1) FD_SET(c, &fds);
+
+		num = sys_select(MAX(s+1, c+1),&fds,NULL);
+		if (num <= 0) continue;
+		
+		if (c != -1 && FD_ISSET(c, &fds)) {
+			if (!receive_smb(c, packet, 0)) {
+				DEBUG(0,("client closed connection\n"));
+				exit(0);
+			}
+			filter_request(packet);
+			if (!send_smb(s, packet)) {
+				DEBUG(0,("server is dead\n"));
+				exit(1);
+			}			
+		}
+		if (s != -1 && FD_ISSET(s, &fds)) {
+			if (!receive_smb(s, packet, 0)) {
+				DEBUG(0,("server closed connection\n"));
+				exit(0);
+			}
+			filter_reply(packet);
+			if (!send_smb(c, packet)) {
+				DEBUG(0,("client is dead\n"));
+				exit(1);
+			}			
+		}
+	}
+	DEBUG(0,("Connection closed\n"));
+	exit(0);
+}
+
+
+static void start_filter(char *desthost)
+{
+	int s, c;
+	struct in_addr dest_ip;
+
+	CatchChild();
+
+	/* start listening on port 139 locally */
+	s = open_socket_in(SOCK_STREAM, 139, 0, 0, True);
+	
+	if (s == -1) {
+		DEBUG(0,("bind failed\n"));
+		exit(1);
+	}
+
+	if (listen(s, 5) == -1) {
+		DEBUG(0,("listen failed\n"));
+	}
+
+	if (!resolve_name(desthost, &dest_ip, 0x20)) {
+		DEBUG(0,("Unable to resolve host %s\n", desthost));
+		exit(1);
+	}
+
+	while (1) {
+		fd_set fds;
+		int num;
+		struct sockaddr addr;
+		int in_addrlen = sizeof(addr);
+		
+		FD_ZERO(&fds);
+		FD_SET(s, &fds);
+
+		num = sys_select(s+1,&fds,NULL);
+		if (num > 0) {
+			c = accept(s, &addr, &in_addrlen);
+			if (c != -1) {
+				if (fork() == 0) {
+					close(s);
+					filter_child(c, dest_ip);
+					exit(0);
+				} else {
+					close(c);
+				}
+			}
+		}
+	}
+}
+
+
+int main(int argc, char *argv[])
+{
+	char *desthost;
+	pstring configfile;
+
+	TimeInit();
+
+	setup_logging(argv[0],True);
+  
+	charset_initialise();
+
+	pstrcpy(configfile,CONFIGFILE);
+ 
+	if (argc < 2) {
+		fprintf(stderr,"smbfilter <desthost> <netbiosname>\n");
+		exit(1);
+	}
+
+	desthost = argv[1];
+	if (argc > 2) {
+		netbiosname = argv[2];
+	}
+
+	if (!lp_load(configfile,True,False,False)) {
+		DEBUG(0,("Unable to load config file\n"));
+	}
+
+	start_filter(desthost);
+	return 0;
+}