1/*
2   Unix SMB/CIFS implementation.
3   Pipe SMB reply routines
4   Copyright (C) Andrew Tridgell 1992-1998
5   Copyright (C) Luke Kenneth Casson Leighton 1996-1998
6   Copyright (C) Paul Ashton  1997-1998.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 2 of the License, or
11   (at your option) any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with this program; if not, write to the Free Software
20   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21*/
22/*
23   This file handles reply_ calls on named pipes that the server
24   makes to handle specific protocols
25*/
26
27
28#include "includes.h"
29
30#define	PIPE		"\\PIPE\\"
31#define	PIPELEN		strlen(PIPE)
32
33extern struct pipe_id_info pipe_names[];
34
35/****************************************************************************
36  reply to an open and X on a named pipe
37
38  This code is basically stolen from reply_open_and_X with some
39  wrinkles to handle pipes.
40****************************************************************************/
41int reply_open_pipe_and_X(connection_struct *conn,
42			  char *inbuf,char *outbuf,int length,int bufsize)
43{
44	pstring fname;
45	pstring pipe_name;
46	uint16 vuid = SVAL(inbuf, smb_uid);
47	smb_np_struct *p;
48	int smb_ofun = SVAL(inbuf,smb_vwv8);
49	int size=0,fmode=0,mtime=0,rmode=0;
50	int i;
51
52	/* XXXX we need to handle passed times, sattr and flags */
53	srvstr_pull_buf(inbuf, pipe_name, smb_buf(inbuf), sizeof(pipe_name), STR_TERMINATE);
54
55	/* If the name doesn't start \PIPE\ then this is directed */
56	/* at a mailslot or something we really, really don't understand, */
57	/* not just something we really don't understand. */
58	if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 )
59		return(ERROR_DOS(ERRSRV,ERRaccess));
60
61	DEBUG(4,("Opening pipe %s.\n", pipe_name));
62
63	/* See if it is one we want to handle. */
64	for( i = 0; pipe_names[i].client_pipe ; i++ )
65		if( strequal(pipe_name,pipe_names[i].client_pipe) )
66			break;
67
68	if (pipe_names[i].client_pipe == NULL)
69		return(ERROR_BOTH(NT_STATUS_OBJECT_NAME_NOT_FOUND,ERRDOS,ERRbadpipe));
70
71	/* Strip \PIPE\ off the name. */
72	pstrcpy(fname, pipe_name + PIPELEN);
73
74
75#if 0
76	/*
77	 * Hack for NT printers... JRA.
78	 */
79    if(should_fail_next_srvsvc_open(fname))
80      return(ERROR(ERRSRV,ERRaccess));
81#endif
82
83	/* Known pipes arrive with DIR attribs. Remove it so a regular file */
84	/* can be opened and add it in after the open. */
85	DEBUG(3,("Known pipe %s opening.\n",fname));
86	smb_ofun |= FILE_CREATE_IF_NOT_EXIST;
87
88	p = open_rpc_pipe_p(fname, conn, vuid);
89	if (!p) return(ERROR_DOS(ERRSRV,ERRnofids));
90
91	/* Prepare the reply */
92	set_message(outbuf,15,0,True);
93
94	/* Mark the opened file as an existing named pipe in message mode. */
95	SSVAL(outbuf,smb_vwv9,2);
96	SSVAL(outbuf,smb_vwv10,0xc700);
97
98	if (rmode == 2) {
99		DEBUG(4,("Resetting open result to open from create.\n"));
100		rmode = 1;
101	}
102
103	SSVAL(outbuf,smb_vwv2, p->pnum);
104	SSVAL(outbuf,smb_vwv3,fmode);
105	put_dos_date3(outbuf,smb_vwv4,mtime);
106	SIVAL(outbuf,smb_vwv6,size);
107	SSVAL(outbuf,smb_vwv8,rmode);
108	SSVAL(outbuf,smb_vwv11,0x0001);
109
110	return chain_reply(inbuf,outbuf,length,bufsize);
111}
112
113/****************************************************************************
114  reply to a write on a pipe
115****************************************************************************/
116int reply_pipe_write(char *inbuf,char *outbuf,int length,int dum_bufsize)
117{
118	smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv0);
119	size_t numtowrite = SVAL(inbuf,smb_vwv1);
120	int nwritten;
121	int outsize;
122	char *data;
123
124	if (!p)
125		return(ERROR_DOS(ERRDOS,ERRbadfid));
126
127	data = smb_buf(inbuf) + 3;
128
129	if (numtowrite == 0)
130		nwritten = 0;
131	else
132		nwritten = write_to_pipe(p, data, numtowrite);
133
134	if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0))
135		return (UNIXERROR(ERRDOS,ERRnoaccess));
136
137	outsize = set_message(outbuf,1,0,True);
138
139	SSVAL(outbuf,smb_vwv0,nwritten);
140
141	DEBUG(3,("write-IPC pnum=%04x nwritten=%d\n",
142		 p->pnum, nwritten));
143
144	return(outsize);
145}
146
147/****************************************************************************
148 Reply to a write and X.
149
150 This code is basically stolen from reply_write_and_X with some
151 wrinkles to handle pipes.
152****************************************************************************/
153
154int reply_pipe_write_and_X(char *inbuf,char *outbuf,int length,int bufsize)
155{
156	smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv2);
157	size_t numtowrite = SVAL(inbuf,smb_vwv10);
158	int nwritten = -1;
159	int smb_doff = SVAL(inbuf, smb_vwv11);
160	BOOL pipe_start_message_raw = ((SVAL(inbuf, smb_vwv7) & (PIPE_START_MESSAGE|PIPE_RAW_MODE)) ==
161									(PIPE_START_MESSAGE|PIPE_RAW_MODE));
162	char *data;
163
164	if (!p)
165		return(ERROR_DOS(ERRDOS,ERRbadfid));
166
167	data = smb_base(inbuf) + smb_doff;
168
169	if (numtowrite == 0)
170		nwritten = 0;
171	else {
172		if(pipe_start_message_raw) {
173			/*
174			 * For the start of a message in named pipe byte mode,
175			 * the first two bytes are a length-of-pdu field. Ignore
176			 * them (we don't trust the client. JRA.
177			 */
178	        if(numtowrite < 2) {
179				DEBUG(0,("reply_pipe_write_and_X: start of message set and not enough data sent.(%u)\n",
180					(unsigned int)numtowrite ));
181				return (UNIXERROR(ERRDOS,ERRnoaccess));
182			}
183
184			data += 2;
185			numtowrite -= 2;
186    	}
187		nwritten = write_to_pipe(p, data, numtowrite);
188	}
189
190	if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0))
191		return (UNIXERROR(ERRDOS,ERRnoaccess));
192
193	set_message(outbuf,6,0,True);
194
195	nwritten = (pipe_start_message_raw ? nwritten + 2 : nwritten);
196	SSVAL(outbuf,smb_vwv2,nwritten);
197
198	DEBUG(3,("writeX-IPC pnum=%04x nwritten=%d\n",
199		 p->pnum, nwritten));
200
201	return chain_reply(inbuf,outbuf,length,bufsize);
202}
203
204/****************************************************************************
205  reply to a read and X
206
207  This code is basically stolen from reply_read_and_X with some
208  wrinkles to handle pipes.
209****************************************************************************/
210int reply_pipe_read_and_X(char *inbuf,char *outbuf,int length,int bufsize)
211{
212	smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv2);
213	int smb_maxcnt = SVAL(inbuf,smb_vwv5);
214	int smb_mincnt = SVAL(inbuf,smb_vwv6);
215	int nread = -1;
216	char *data;
217	BOOL unused;
218
219	/* we don't use the offset given to use for pipe reads. This
220           is deliberate, instead we always return the next lump of
221           data on the pipe */
222#if 0
223	uint32 smb_offs = IVAL(inbuf,smb_vwv3);
224#endif
225
226	if (!p)
227		return(ERROR_DOS(ERRDOS,ERRbadfid));
228
229	set_message(outbuf,12,0,True);
230	data = smb_buf(outbuf);
231
232	nread = read_from_pipe(p, data, smb_maxcnt, &unused);
233
234	if (nread < 0)
235		return(UNIXERROR(ERRDOS,ERRnoaccess));
236
237	SSVAL(outbuf,smb_vwv5,nread);
238	SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf));
239	SSVAL(smb_buf(outbuf),-2,nread);
240
241	DEBUG(3,("readX-IPC pnum=%04x min=%d max=%d nread=%d\n",
242		 p->pnum, smb_mincnt, smb_maxcnt, nread));
243
244	/* Ensure we set up the message length to include the data length read. */
245	set_message_bcc(outbuf,nread);
246	return chain_reply(inbuf,outbuf,length,bufsize);
247}
248
249/****************************************************************************
250  reply to a close
251****************************************************************************/
252int reply_pipe_close(connection_struct *conn, char *inbuf,char *outbuf)
253{
254	smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv0);
255	int outsize = set_message(outbuf,0,0,True);
256
257	if (!p)
258		return(ERROR_DOS(ERRDOS,ERRbadfid));
259
260	DEBUG(5,("reply_pipe_close: pnum:%x\n", p->pnum));
261
262	if (!close_rpc_pipe_hnd(p))
263		return ERROR_DOS(ERRDOS,ERRbadfid);
264
265	return(outsize);
266}
267