source/smbd/pipes.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    Pipe SMB reply routines
   5    Copyright (C) Andrew Tridgell 1992-1998
   6    Copyright (C) Luke Kenneth Casson Leighton 1996-1998
   7    Copyright (C) Paul Ashton  1997-1998.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23 /*
  24    This file handles reply_ calls on named pipes that the server
  25    makes to handle specific protocols
  26 */
  27
  28
  29 #include "includes.h"
  30
  31 #define PIPE            "\\PIPE\\"
  32 #define PIPELEN         strlen(PIPE)
  33
  34 extern struct pipe_id_info pipe_names[];
  35
  36 /****************************************************************************
  37   reply to an open and X on a named pipe
  38
  39   This code is basically stolen from reply_open_and_X with some
  40   wrinkles to handle pipes.
  41 ****************************************************************************/
  42 int reply_open_pipe_and_X(connection_struct *conn,
  43                           char *inbuf,char *outbuf,int length,int bufsize)
  44 {
  45         pstring fname;
  46         uint16 vuid = SVAL(inbuf, smb_uid);
  47         pipes_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         pstrcpy(fname,smb_buf(inbuf));
  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(fname,PIPE,PIPELEN) != 0 )
  59                 return(ERROR_DOS(ERRSRV,ERRaccess));
  60
  61         DEBUG(4,("Opening pipe %s.\n", fname));
  62
  63         /* See if it is one we want to handle. */
  64         for( i = 0; pipe_names[i].client_pipe ; i++ )
  65                 if( strequal(fname,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,smb_buf(inbuf) + PIPELEN);
  73
  74 #if 0
  75         /*
  76          * Hack for NT printers... JRA.
  77          */
  78     if(should_fail_next_srvsvc_open(fname))
  79       return(ERROR_DOS(ERRSRV,ERRaccess));
  80 #endif
  81
  82         /* Known pipes arrive with DIR attribs. Remove it so a regular file */
  83         /* can be opened and add it in after the open. */
  84         DEBUG(3,("Known pipe %s opening.\n",fname));
  85         smb_ofun |= FILE_CREATE_IF_NOT_EXIST;
  86
  87         p = open_rpc_pipe_p(fname, conn, vuid);
  88         if (!p) return(ERROR_DOS(ERRSRV,ERRnofids));
  89
  90         /* Prepare the reply */
  91         set_message(outbuf,15,0,True);
  92
  93         /* Mark the opened file as an existing named pipe in message mode. */
  94         SSVAL(outbuf,smb_vwv9,2);
  95         SSVAL(outbuf,smb_vwv10,0xc700);
  96
  97         if (rmode == 2) {
  98                 DEBUG(4,("Resetting open result to open from create.\n"));
  99                 rmode = 1;
 100         }
 101
 102         SSVAL(outbuf,smb_vwv2, p->pnum);
 103         SSVAL(outbuf,smb_vwv3,fmode);
 104         put_dos_date3(outbuf,smb_vwv4,mtime);
 105         SIVAL(outbuf,smb_vwv6,size);
 106         SSVAL(outbuf,smb_vwv8,rmode);
 107         SSVAL(outbuf,smb_vwv11,0x0001);
 108
 109         return chain_reply(inbuf,outbuf,length,bufsize);
 110 }
 111
 112 /****************************************************************************
 113   reply to a write on a pipe
 114 ****************************************************************************/
 115 int reply_pipe_write(char *inbuf,char *outbuf,int length,int dum_bufsize)
 116 {
 117         pipes_struct *p = get_rpc_pipe_p(inbuf,smb_vwv0);
 118         size_t numtowrite = SVAL(inbuf,smb_vwv1);
 119         int nwritten;
 120         int outsize;
 121         char *data;
 122
 123         if (!p)
 124                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 125
 126         data = smb_buf(inbuf) + 3;
 127
 128         if (numtowrite == 0)
 129                 nwritten = 0;
 130         else
 131                 nwritten = write_to_pipe(p, data, numtowrite);
 132
 133         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0))
 134                 return (UNIXERROR(ERRDOS,ERRnoaccess));
 135
 136         outsize = set_message(outbuf,1,0,True);
 137
 138         SSVAL(outbuf,smb_vwv0,nwritten);
 139
 140         DEBUG(3,("write-IPC pnum=%04x nwritten=%d\n",
 141                  p->pnum, nwritten));
 142
 143         return(outsize);
 144 }
 145
 146 /****************************************************************************
 147  Reply to a write and X.
 148
 149  This code is basically stolen from reply_write_and_X with some
 150  wrinkles to handle pipes.
 151 ****************************************************************************/
 152
 153 int reply_pipe_write_and_X(char *inbuf,char *outbuf,int length,int bufsize)
 154 {
 155         pipes_struct *p = get_rpc_pipe_p(inbuf,smb_vwv2);
 156         size_t numtowrite = SVAL(inbuf,smb_vwv10);
 157         int nwritten = -1;
 158         int smb_doff = SVAL(inbuf, smb_vwv11);
 159         BOOL pipe_start_message_raw = ((SVAL(inbuf, smb_vwv7) & (PIPE_START_MESSAGE|PIPE_RAW_MODE)) ==
 160                                                                         (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 161         char *data;
 162
 163         if (!p)
 164                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 165
 166         data = smb_base(inbuf) + smb_doff;
 167
 168         if (numtowrite == 0)
 169                 nwritten = 0;
 170         else {
 171                 if(pipe_start_message_raw) {
 172                         /*
 173                          * For the start of a message in named pipe byte mode,
 174                          * the first two bytes are a length-of-pdu field. Ignore
 175                          * them (we don't trust the client. JRA.
 176                          */
 177                 if(numtowrite < 2) {
 178                                 DEBUG(0,("reply_pipe_write_and_X: start of message set and not enough data sent.(%u)\n",
 179                                         (unsigned int)numtowrite ));
 180                                 return (UNIXERROR(ERRDOS,ERRnoaccess));
 181                         }
 182
 183                         data += 2;
 184                         numtowrite -= 2;
 185         }
 186                 nwritten = write_to_pipe(p, data, numtowrite);
 187         }
 188
 189         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0))
 190                 return (UNIXERROR(ERRDOS,ERRnoaccess));
 191
 192         set_message(outbuf,6,0,True);
 193
 194         nwritten = (pipe_start_message_raw ? nwritten + 2 : nwritten);
 195         SSVAL(outbuf,smb_vwv2,nwritten);
 196
 197         DEBUG(3,("writeX-IPC pnum=%04x nwritten=%d\n",
 198                  p->pnum, nwritten));
 199
 200         return chain_reply(inbuf,outbuf,length,bufsize);
 201 }
 202
 203 /****************************************************************************
 204   reply to a read and X
 205
 206   This code is basically stolen from reply_read_and_X with some
 207   wrinkles to handle pipes.
 208 ****************************************************************************/
 209 int reply_pipe_read_and_X(char *inbuf,char *outbuf,int length,int bufsize)
 210 {
 211         pipes_struct *p = get_rpc_pipe_p(inbuf,smb_vwv2);
 212         int smb_maxcnt = SVAL(inbuf,smb_vwv5);
 213         int smb_mincnt = SVAL(inbuf,smb_vwv6);
 214         int nread = -1;
 215         char *data;
 216         /* we don't use the offset given to use for pipe reads. This
 217            is deliberate, instead we always return the next lump of
 218            data on the pipe */
 219 #if 0
 220         uint32 smb_offs = IVAL(inbuf,smb_vwv3);
 221 #endif
 222
 223         if (!p)
 224                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 225
 226         set_message(outbuf,12,0,True);
 227         data = smb_buf(outbuf);
 228
 229         nread = read_from_pipe(p, data, smb_maxcnt);
 230
 231         if (nread < 0)
 232                 return(UNIXERROR(ERRDOS,ERRnoaccess));
 233
 234         SSVAL(outbuf,smb_vwv5,nread);
 235         SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf));
 236         SSVAL(smb_buf(outbuf),-2,nread);
 237
 238         DEBUG(3,("readX-IPC pnum=%04x min=%d max=%d nread=%d\n",
 239                  p->pnum, smb_mincnt, smb_maxcnt, nread));
 240
 241         return chain_reply(inbuf,outbuf,length,bufsize);
 242 }
 243
 244 /****************************************************************************
 245   reply to a close
 246 ****************************************************************************/
 247 int reply_pipe_close(connection_struct *conn, char *inbuf,char *outbuf)
 248 {
 249         pipes_struct *p = get_rpc_pipe_p(inbuf,smb_vwv0);
 250         int outsize = set_message(outbuf,0,0,True);
 251
 252         if (!p)
 253                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 254
 255         DEBUG(5,("reply_pipe_close: pnum:%x\n", p->pnum));
 256
 257         if (!close_rpc_pipe_hnd(p, conn))
 258                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 259
 260         return(outsize);
 261 }