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 #include "trans2.h"
  31
  32 #define PIPE            "\\PIPE\\"
  33 #define PIPELEN         strlen(PIPE)
  34
  35 extern int DEBUGLEVEL;
  36
  37 extern struct pipe_id_info pipe_names[];
  38
  39 /****************************************************************************
  40   reply to an open and X on a named pipe
  41
  42   This code is basically stolen from reply_open_and_X with some
  43   wrinkles to handle pipes.
  44 ****************************************************************************/
  45 int reply_open_pipe_and_X(connection_struct * conn,
  46                           char *inbuf, char *outbuf, int length, int bufsize)
  47 {
  48         pstring fname;
  49         uint16 vuid = SVAL(inbuf, smb_uid);
  50         pipes_struct *p;
  51         int smb_ofun = SVAL(inbuf, smb_vwv8);
  52         int size = 0, fmode = 0, mtime = 0, rmode = 0;
  53         int i;
  54         vuser_key key;
  55
  56         /* XXXX we need to handle passed times, sattr and flags */
  57         pstrcpy(fname, smb_buf(inbuf));
  58
  59         /* If the name doesn't start \PIPE\ then this is directed */
  60         /* at a mailslot or something we really, really don't understand, */
  61         /* not just something we really don't understand. */
  62         if (strncmp(fname, PIPE, PIPELEN) != 0)
  63                 return (ERROR(ERRSRV, ERRaccess));
  64
  65         DEBUG(4, ("Opening pipe %s.\n", fname));
  66
  67         /* See if it is one we want to handle. */
  68         for (i = 0; pipe_names[i].client_pipe; i++)
  69                 if (strequal(fname, pipe_names[i].client_pipe))
  70                         break;
  71
  72         if (pipe_names[i].client_pipe == NULL)
  73                 return (ERROR(ERRSRV, ERRaccess));
  74
  75         /* Strip \PIPE\ off the name. */
  76         pstrcpy(fname, smb_buf(inbuf) + PIPELEN);
  77
  78         /* Known pipes arrive with DIR attribs. Remove it so a regular file */
  79         /* can be opened and add it in after the open. */
  80         DEBUG(3, ("Known pipe %s opening.\n", fname));
  81         smb_ofun |= 0x10;       /* Add Create it not exists flag */
  82
  83         key.pid = getpid();
  84         key.vuid = vuid;
  85         p = open_rpc_pipe_p(fname, &key, NULL);
  86         if (!p)
  87                 return (ERROR(ERRSRV, ERRnofids));
  88
  89         /* Prepare the reply */
  90         set_message(outbuf, 15, 0, True);
  91
  92         /* Mark the opened file as an existing named pipe in message mode. */
  93         SSVAL(outbuf, smb_vwv9, 2);
  94         SSVAL(outbuf, smb_vwv10, 0xc700);
  95
  96         if (rmode == 2)
  97         {
  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
 114
 115   This code is basically stolen from reply_write with some
 116   wrinkles to handle pipes.
 117 ****************************************************************************/
 118 int reply_pipe_write(char *inbuf, char *outbuf, int length, int bufsize)
 119 {
 120         pipes_struct *p = get_rpc_pipe_p(inbuf, smb_vwv0);
 121         size_t numtowrite = SVAL(inbuf, smb_vwv1);
 122         int nwritten = -1;
 123         char *data;
 124         size_t outsize;
 125
 126         if (!p)
 127                 return (ERROR(ERRDOS, ERRbadfid));
 128
 129         data = smb_buf(inbuf) + 3;
 130
 131         if (numtowrite == 0)
 132         {
 133                 nwritten = 0;
 134         }
 135         else
 136         {
 137                 nwritten = write_pipe(p, data, numtowrite);
 138         }
 139
 140         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0))
 141         {
 142                 DEBUG(3, ("reply_write_pipe: nwritten: %d numtowrite:%d\n",
 143                           nwritten, numtowrite));
 144                 return (UNIXERROR(ERRDOS, ERRnoaccess));
 145         }
 146
 147         outsize = set_message(outbuf, 1, 0, True);
 148
 149         SSVAL(outbuf, smb_vwv0, nwritten);
 150
 151         DEBUG(3, ("write-IPC pnum=%04x nwritten=%d\n", p->pnum, nwritten));
 152
 153         return outsize;
 154 }
 155
 156 /****************************************************************************
 157   reply to a write and X
 158
 159   This code is basically stolen from reply_write_and_X with some
 160   wrinkles to handle pipes.
 161 ****************************************************************************/
 162 int reply_pipe_write_and_X(char *inbuf, char *outbuf, int length, int bufsize)
 163 {
 164         pipes_struct *p = get_rpc_pipe_p(inbuf, smb_vwv2);
 165         size_t numtowrite = SVAL(inbuf, smb_vwv10);
 166         int nwritten = -1;
 167         int smb_doff = SVAL(inbuf, smb_vwv11);
 168         int write_mode = SVAL(inbuf, smb_vwv7);
 169         char *data;
 170
 171         /*
 172          * start of message mode pipe: indicates start of dce/rpc pdu.
 173          */
 174
 175         BOOL msg;
 176         msg = IS_BITS_SET_ALL(write_mode, PIPE_START_MESSAGE | PIPE_RAW_MODE);
 177
 178         if (!p)
 179                 return (ERROR(ERRDOS, ERRbadfid));
 180
 181         data = smb_base(inbuf) + smb_doff;
 182
 183         if (numtowrite == 0)
 184         {
 185                 nwritten = 0;
 186         }
 187         else
 188         {
 189                 if (msg)
 190                 {
 191                         /*
 192                          * skip the length-of-pdu, the client could be
 193                          * a nasty bitch and lie to us, e.g
 194                          * an nt-smb-writepipe-DoS attack.
 195                          */
 196
 197                         data += 2;
 198                         numtowrite -= 2;
 199                 }
 200
 201                 nwritten = write_pipe(p, data, numtowrite);
 202
 203                 if (msg && nwritten != 0)
 204                 {
 205                         nwritten += 2;
 206                 }
 207         }
 208
 209         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0))
 210         {
 211                 return (UNIXERROR(ERRDOS, ERRnoaccess));
 212         }
 213
 214         set_message(outbuf, 6, 0, True);
 215         SSVAL(outbuf, smb_vwv2, nwritten);
 216
 217         DEBUG(3, ("writeX-IPC pnum=%04x nwritten=%d\n", p->pnum, nwritten));
 218
 219         return chain_reply(inbuf, outbuf, length, bufsize);
 220 }
 221
 222 /****************************************************************************
 223   reply to a read and X
 224
 225   This code is basically stolen from reply_read_and_X with some
 226   wrinkles to handle pipes.
 227 ****************************************************************************/
 228 int reply_pipe_read_and_X(char *inbuf, char *outbuf, int length, int bufsize)
 229 {
 230         pipes_struct *p = get_rpc_pipe_p(inbuf, smb_vwv2);
 231         int smb_maxcnt = SVAL(inbuf, smb_vwv5);
 232         int smb_mincnt = SVAL(inbuf, smb_vwv6);
 233         int nread = -1;
 234         char *data;
 235
 236         if (!p)
 237                 return (ERROR(ERRDOS, ERRbadfid));
 238
 239         set_message(outbuf, 12, 0, True);
 240         data = smb_buf(outbuf);
 241
 242         nread = read_pipe(p, data, 1, smb_maxcnt);
 243
 244         if (nread < 0)
 245                 return (UNIXERROR(ERRDOS, ERRnoaccess));
 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         return chain_reply(inbuf, outbuf, length, bufsize);
 255 }
 256
 257 /****************************************************************************
 258   reply to a close
 259 ****************************************************************************/
 260 int reply_pipe_close(connection_struct * conn, char *inbuf, char *outbuf)
 261 {
 262         pipes_struct *p = get_rpc_pipe_p(inbuf, smb_vwv0);
 263         int outsize = set_message(outbuf, 0, 0, True);
 264
 265         if (!p)
 266                 return (ERROR(ERRDOS, ERRbadfid));
 267
 268         DEBUG(5, ("reply_pipe_close: pnum:%x\n", p->pnum));
 269
 270         if (!close_rpc_pipe_hnd(p))
 271                 return (ERROR(ERRDOS, ERRbadfid));
 272
 273         return (outsize);
 274 }