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 #define MAX_PIPE_NAME_LEN       24
  35
  36 /* PIPE/<name>/<pid>/<pnum> */
  37 #define PIPEDB_KEY_FORMAT "PIPE/%s/%u/%d"
  38
  39 struct pipe_dbrec {
  40         struct process_id pid;
  41         int pnum;
  42         uid_t uid;
  43
  44         char name[MAX_PIPE_NAME_LEN];
  45         fstring user;
  46 };
  47
  48
  49 extern struct pipe_id_info pipe_names[];
  50
  51 /****************************************************************************
  52  Reply to an open and X on a named pipe.
  53  This code is basically stolen from reply_open_and_X with some
  54  wrinkles to handle pipes.
  55 ****************************************************************************/
  56
  57 int reply_open_pipe_and_X(connection_struct *conn,
  58                           char *inbuf,char *outbuf,int length,int bufsize)
  59 {
  60         pstring fname;
  61         pstring pipe_name;
  62         uint16 vuid = SVAL(inbuf, smb_uid);
  63         smb_np_struct *p;
  64         int size=0,fmode=0,mtime=0,rmode=0;
  65         int i;
  66
  67         /* XXXX we need to handle passed times, sattr and flags */
  68         srvstr_pull_buf(inbuf, pipe_name, smb_buf(inbuf), sizeof(pipe_name), STR_TERMINATE);
  69
  70         /* If the name doesn't start \PIPE\ then this is directed */
  71         /* at a mailslot or something we really, really don't understand, */
  72         /* not just something we really don't understand. */
  73         if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 ) {
  74                 return(ERROR_DOS(ERRSRV,ERRaccess));
  75         }
  76
  77         DEBUG(4,("Opening pipe %s.\n", pipe_name));
  78
  79         /* See if it is one we want to handle. */
  80         for( i = 0; pipe_names[i].client_pipe ; i++ ) {
  81                 if( strequal(pipe_name,pipe_names[i].client_pipe)) {
  82                         break;
  83                 }
  84         }
  85
  86         if (pipe_names[i].client_pipe == NULL) {
  87                 return(ERROR_BOTH(NT_STATUS_OBJECT_NAME_NOT_FOUND,ERRDOS,ERRbadpipe));
  88         }
  89
  90         /* Strip \PIPE\ off the name. */
  91         pstrcpy(fname, pipe_name + PIPELEN);
  92
  93 #if 0
  94         /*
  95          * Hack for NT printers... JRA.
  96          */
  97     if(should_fail_next_srvsvc_open(fname))
  98       return(ERROR(ERRSRV,ERRaccess));
  99 #endif
 100
 101         /* Known pipes arrive with DIR attribs. Remove it so a regular file */
 102         /* can be opened and add it in after the open. */
 103         DEBUG(3,("Known pipe %s opening.\n",fname));
 104
 105         p = open_rpc_pipe_p(fname, conn, vuid);
 106         if (!p) {
 107                 return(ERROR_DOS(ERRSRV,ERRnofids));
 108         }
 109
 110         /* Prepare the reply */
 111         set_message(outbuf,15,0,True);
 112
 113         /* Mark the opened file as an existing named pipe in message mode. */
 114         SSVAL(outbuf,smb_vwv9,2);
 115         SSVAL(outbuf,smb_vwv10,0xc700);
 116
 117         if (rmode == 2) {
 118                 DEBUG(4,("Resetting open result to open from create.\n"));
 119                 rmode = 1;
 120         }
 121
 122         SSVAL(outbuf,smb_vwv2, p->pnum);
 123         SSVAL(outbuf,smb_vwv3,fmode);
 124         srv_put_dos_date3(outbuf,smb_vwv4,mtime);
 125         SIVAL(outbuf,smb_vwv6,size);
 126         SSVAL(outbuf,smb_vwv8,rmode);
 127         SSVAL(outbuf,smb_vwv11,0x0001);
 128
 129         return chain_reply(inbuf,outbuf,length,bufsize);
 130 }
 131
 132 /****************************************************************************
 133  Reply to a write on a pipe.
 134 ****************************************************************************/
 135
 136 int reply_pipe_write(char *inbuf,char *outbuf,int length,int dum_bufsize)
 137 {
 138         smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv0);
 139         uint16 vuid = SVAL(inbuf,smb_uid);
 140         size_t numtowrite = SVAL(inbuf,smb_vwv1);
 141         int nwritten;
 142         int outsize;
 143         char *data;
 144
 145         if (!p) {
 146                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 147         }
 148
 149         if (p->vuid != vuid) {
 150                 return ERROR_NT(NT_STATUS_INVALID_HANDLE);
 151         }
 152
 153         data = smb_buf(inbuf) + 3;
 154
 155         if (numtowrite == 0) {
 156                 nwritten = 0;
 157         } else {
 158                 nwritten = write_to_pipe(p, data, numtowrite);
 159         }
 160
 161         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0)) {
 162                 return (UNIXERROR(ERRDOS,ERRnoaccess));
 163         }
 164
 165         outsize = set_message(outbuf,1,0,True);
 166
 167         SSVAL(outbuf,smb_vwv0,nwritten);
 168
 169         DEBUG(3,("write-IPC pnum=%04x nwritten=%d\n", p->pnum, nwritten));
 170
 171         return(outsize);
 172 }
 173
 174 /****************************************************************************
 175  Reply to a write and X.
 176
 177  This code is basically stolen from reply_write_and_X with some
 178  wrinkles to handle pipes.
 179 ****************************************************************************/
 180
 181 int reply_pipe_write_and_X(char *inbuf,char *outbuf,int length,int bufsize)
 182 {
 183         smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv2);
 184         uint16 vuid = SVAL(inbuf,smb_uid);
 185         size_t numtowrite = SVAL(inbuf,smb_vwv10);
 186         int nwritten = -1;
 187         int smb_doff = SVAL(inbuf, smb_vwv11);
 188         BOOL pipe_start_message_raw = ((SVAL(inbuf, smb_vwv7) & (PIPE_START_MESSAGE|PIPE_RAW_MODE)) ==
 189                                                                 (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 190         char *data;
 191
 192         if (!p) {
 193                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 194         }
 195
 196         if (p->vuid != vuid) {
 197                 return ERROR_NT(NT_STATUS_INVALID_HANDLE);
 198         }
 199
 200         data = smb_base(inbuf) + smb_doff;
 201
 202         if (numtowrite == 0) {
 203                 nwritten = 0;
 204         } else {
 205                 if(pipe_start_message_raw) {
 206                         /*
 207                          * For the start of a message in named pipe byte mode,
 208                          * the first two bytes are a length-of-pdu field. Ignore
 209                          * them (we don't trust the client). JRA.
 210                          */
 211                        if(numtowrite < 2) {
 212                                 DEBUG(0,("reply_pipe_write_and_X: start of message set and not enough data sent.(%u)\n",
 213                                         (unsigned int)numtowrite ));
 214                                 return (UNIXERROR(ERRDOS,ERRnoaccess));
 215                         }
 216
 217                         data += 2;
 218                         numtowrite -= 2;
 219                 }
 220                 nwritten = write_to_pipe(p, data, numtowrite);
 221         }
 222
 223         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0)) {
 224                 return (UNIXERROR(ERRDOS,ERRnoaccess));
 225         }
 226
 227         set_message(outbuf,6,0,True);
 228
 229         nwritten = (pipe_start_message_raw ? nwritten + 2 : nwritten);
 230         SSVAL(outbuf,smb_vwv2,nwritten);
 231
 232         DEBUG(3,("writeX-IPC pnum=%04x nwritten=%d\n", p->pnum, nwritten));
 233
 234         return chain_reply(inbuf,outbuf,length,bufsize);
 235 }
 236
 237 /****************************************************************************
 238  Reply to a read and X.
 239  This code is basically stolen from reply_read_and_X with some
 240  wrinkles to handle pipes.
 241 ****************************************************************************/
 242
 243 int reply_pipe_read_and_X(char *inbuf,char *outbuf,int length,int bufsize)
 244 {
 245         smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv2);
 246         int smb_maxcnt = SVAL(inbuf,smb_vwv5);
 247         int smb_mincnt = SVAL(inbuf,smb_vwv6);
 248         int nread = -1;
 249         char *data;
 250         BOOL unused;
 251
 252         /* we don't use the offset given to use for pipe reads. This
 253            is deliberate, instead we always return the next lump of
 254            data on the pipe */
 255 #if 0
 256         uint32 smb_offs = IVAL(inbuf,smb_vwv3);
 257 #endif
 258
 259         if (!p) {
 260                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 261         }
 262
 263         set_message(outbuf,12,0,True);
 264         data = smb_buf(outbuf);
 265
 266         nread = read_from_pipe(p, data, smb_maxcnt, &unused);
 267
 268         if (nread < 0) {
 269                 return(UNIXERROR(ERRDOS,ERRnoaccess));
 270         }
 271
 272         SSVAL(outbuf,smb_vwv5,nread);
 273         SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf));
 274         SSVAL(smb_buf(outbuf),-2,nread);
 275
 276         DEBUG(3,("readX-IPC pnum=%04x min=%d max=%d nread=%d\n",
 277                  p->pnum, smb_mincnt, smb_maxcnt, nread));
 278
 279         /* Ensure we set up the message length to include the data length read. */
 280         set_message_bcc(outbuf,nread);
 281         return chain_reply(inbuf,outbuf,length,bufsize);
 282 }
 283
 284 /****************************************************************************
 285  Reply to a close.
 286 ****************************************************************************/
 287
 288 int reply_pipe_close(connection_struct *conn, char *inbuf,char *outbuf)
 289 {
 290         smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv0);
 291         int outsize = set_message(outbuf,0,0,True);
 292
 293         if (!p) {
 294                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 295         }
 296
 297         DEBUG(5,("reply_pipe_close: pnum:%x\n", p->pnum));
 298
 299         if (!close_rpc_pipe_hnd(p)) {
 300                 return ERROR_DOS(ERRDOS,ERRbadfid);
 301         }
 302
 303         return(outsize);
 304 }