source/smbd/pipes.c

   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    Copyright (C) Jeremy Allison 2005.
   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  This code is basically stolen from reply_open_and_X with some
  39  wrinkles to handle pipes.
  40 ****************************************************************************/
  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         pstring pipe_name;
  47         uint16 vuid = SVAL(inbuf, smb_uid);
  48         smb_np_struct *p;
  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
  62         DEBUG(4,("Opening pipe %s.\n", pipe_name));
  63
  64         /* See if it is one we want to handle. */
  65         for( i = 0; pipe_names[i].client_pipe ; i++ ) {
  66                 if( strequal(pipe_name,pipe_names[i].client_pipe)) {
  67                         break;
  68                 }
  69         }
  70
  71         if (pipe_names[i].client_pipe == NULL) {
  72                 return(ERROR_BOTH(NT_STATUS_OBJECT_NAME_NOT_FOUND,ERRDOS,ERRbadpipe));
  73         }
  74
  75         /* Strip \PIPE\ off the name. */
  76         pstrcpy(fname, pipe_name + PIPELEN);
  77
  78 #if 0
  79         /*
  80          * Hack for NT printers... JRA.
  81          */
  82     if(should_fail_next_srvsvc_open(fname))
  83       return(ERROR(ERRSRV,ERRaccess));
  84 #endif
  85
  86         /* Known pipes arrive with DIR attribs. Remove it so a regular file */
  87         /* can be opened and add it in after the open. */
  88         DEBUG(3,("Known pipe %s opening.\n",fname));
  89
  90         p = open_rpc_pipe_p(fname, conn, vuid);
  91         if (!p) {
  92                 return(ERROR_DOS(ERRSRV,ERRnofids));
  93         }
  94
  95         /* Prepare the reply */
  96         set_message(outbuf,15,0,True);
  97
  98         /* Mark the opened file as an existing named pipe in message mode. */
  99         SSVAL(outbuf,smb_vwv9,2);
 100         SSVAL(outbuf,smb_vwv10,0xc700);
 101
 102         if (rmode == 2) {
 103                 DEBUG(4,("Resetting open result to open from create.\n"));
 104                 rmode = 1;
 105         }
 106
 107         SSVAL(outbuf,smb_vwv2, p->pnum);
 108         SSVAL(outbuf,smb_vwv3,fmode);
 109         put_dos_date3(outbuf,smb_vwv4,mtime);
 110         SIVAL(outbuf,smb_vwv6,size);
 111         SSVAL(outbuf,smb_vwv8,rmode);
 112         SSVAL(outbuf,smb_vwv11,0x0001);
 113
 114         return chain_reply(inbuf,outbuf,length,bufsize);
 115 }
 116
 117 /****************************************************************************
 118  Reply to a write on a pipe.
 119 ****************************************************************************/
 120
 121 int reply_pipe_write(char *inbuf,char *outbuf,int length,int dum_bufsize)
 122 {
 123         smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv0);
 124         size_t numtowrite = SVAL(inbuf,smb_vwv1);
 125         int nwritten;
 126         int outsize;
 127         char *data;
 128
 129         if (!p) {
 130                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 131         }
 132
 133         data = smb_buf(inbuf) + 3;
 134
 135         if (numtowrite == 0) {
 136                 nwritten = 0;
 137         } else {
 138                 nwritten = write_to_pipe(p, data, numtowrite);
 139         }
 140
 141         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0)) {
 142                 return (UNIXERROR(ERRDOS,ERRnoaccess));
 143         }
 144
 145         outsize = set_message(outbuf,1,0,True);
 146
 147         SSVAL(outbuf,smb_vwv0,nwritten);
 148
 149         DEBUG(3,("write-IPC pnum=%04x nwritten=%d\n", p->pnum, nwritten));
 150
 151         return(outsize);
 152 }
 153
 154 /****************************************************************************
 155  Reply to a write and X.
 156
 157  This code is basically stolen from reply_write_and_X with some
 158  wrinkles to handle pipes.
 159 ****************************************************************************/
 160
 161 int reply_pipe_write_and_X(char *inbuf,char *outbuf,int length,int bufsize)
 162 {
 163         smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv2);
 164         size_t numtowrite = SVAL(inbuf,smb_vwv10);
 165         int nwritten = -1;
 166         int smb_doff = SVAL(inbuf, smb_vwv11);
 167         BOOL pipe_start_message_raw = ((SVAL(inbuf, smb_vwv7) & (PIPE_START_MESSAGE|PIPE_RAW_MODE)) ==
 168                                                                 (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 169         char *data;
 170
 171         if (!p) {
 172                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 173         }
 174
 175         data = smb_base(inbuf) + smb_doff;
 176
 177         if (numtowrite == 0) {
 178                 nwritten = 0;
 179         } else {
 180                 if(pipe_start_message_raw) {
 181                         /*
 182                          * For the start of a message in named pipe byte mode,
 183                          * the first two bytes are a length-of-pdu field. Ignore
 184                          * them (we don't trust the client). JRA.
 185                          */
 186                        if(numtowrite < 2) {
 187                                 DEBUG(0,("reply_pipe_write_and_X: start of message set and not enough data sent.(%u)\n",
 188                                         (unsigned int)numtowrite ));
 189                                 return (UNIXERROR(ERRDOS,ERRnoaccess));
 190                         }
 191
 192                         data += 2;
 193                         numtowrite -= 2;
 194                 }
 195                 nwritten = write_to_pipe(p, data, numtowrite);
 196         }
 197
 198         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0)) {
 199                 return (UNIXERROR(ERRDOS,ERRnoaccess));
 200         }
 201
 202         set_message(outbuf,6,0,True);
 203
 204         nwritten = (pipe_start_message_raw ? nwritten + 2 : nwritten);
 205         SSVAL(outbuf,smb_vwv2,nwritten);
 206
 207         DEBUG(3,("writeX-IPC pnum=%04x nwritten=%d\n", p->pnum, nwritten));
 208
 209         return chain_reply(inbuf,outbuf,length,bufsize);
 210 }
 211
 212 /****************************************************************************
 213  Reply to a read and X.
 214  This code is basically stolen from reply_read_and_X with some
 215  wrinkles to handle pipes.
 216 ****************************************************************************/
 217
 218 int reply_pipe_read_and_X(char *inbuf,char *outbuf,int length,int bufsize)
 219 {
 220         smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv2);
 221         int smb_maxcnt = SVAL(inbuf,smb_vwv5);
 222         int smb_mincnt = SVAL(inbuf,smb_vwv6);
 223         int nread = -1;
 224         char *data;
 225         BOOL unused;
 226
 227         /* we don't use the offset given to use for pipe reads. This
 228            is deliberate, instead we always return the next lump of
 229            data on the pipe */
 230 #if 0
 231         uint32 smb_offs = IVAL(inbuf,smb_vwv3);
 232 #endif
 233
 234         if (!p) {
 235                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 236         }
 237
 238         set_message(outbuf,12,0,True);
 239         data = smb_buf(outbuf);
 240
 241         nread = read_from_pipe(p, data, smb_maxcnt, &unused);
 242
 243         if (nread < 0) {
 244                 return(UNIXERROR(ERRDOS,ERRnoaccess));
 245         }
 246
 247         SSVAL(outbuf,smb_vwv5,nread);
 248         SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf));
 249         SSVAL(smb_buf(outbuf),-2,nread);
 250
 251         DEBUG(3,("readX-IPC pnum=%04x min=%d max=%d nread=%d\n",
 252                  p->pnum, smb_mincnt, smb_maxcnt, nread));
 253
 254         /* Ensure we set up the message length to include the data length read. */
 255         set_message_bcc(outbuf,nread);
 256         return chain_reply(inbuf,outbuf,length,bufsize);
 257 }
 258
 259 /****************************************************************************
 260  Reply to a close.
 261 ****************************************************************************/
 262
 263 int reply_pipe_close(connection_struct *conn, char *inbuf,char *outbuf)
 264 {
 265         smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv0);
 266         int outsize = set_message(outbuf,0,0,True);
 267
 268         if (!p) {
 269                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 270         }
 271
 272         DEBUG(5,("reply_pipe_close: pnum:%x\n", p->pnum));
 273
 274         if (!close_rpc_pipe_hnd(p)) {
 275                 return ERROR_DOS(ERRDOS,ERRbadfid);
 276         }
 277
 278         return(outsize);
 279 }