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parse_prs.c

/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Samba memory buffer functions
   Copyright (C) Andrew Tridgell              1992-1997
   Copyright (C) Luke Kenneth Casson Leighton 1996-1997
   Copyright (C) Jeremy Allison 1999.
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

/*******************************************************************
dump a prs to a file
 ********************************************************************/
void prs_dump(const char *name, int v, prs_struct *ps)
{
      int fd, i;
      pstring fname;
      if (DEBUGLEVEL < 50) return;
      for (i=1;i<100;i++) {
            if (v != -1) {
                  slprintf(fname,sizeof(fname)-1, "/tmp/%s_%d.%d.prs", name, v, i);
            } else {
                  slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.prs", name, i);
            }
            fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
            if (fd != -1 || errno != EEXIST) break;
      }
      if (fd != -1) {
            write(fd, ps->data_p + ps->data_offset, ps->buffer_size - ps->data_offset);
            close(fd);
            DEBUG(0,("created %s\n", fname));
      }
}



/*******************************************************************
 debug output for parsing info.

 XXXX side-effect of this function is to increase the debug depth XXXX

 ********************************************************************/
void prs_debug(prs_struct *ps, int depth, const char *desc, const char *fn_name)
{
      DEBUG(5+depth, ("%s%06x %s %s\n", tab_depth(depth), ps->data_offset, fn_name, desc));
}


/**
 * Initialise an expandable parse structure.
 *
 * @param size Initial buffer size.  If >0, a new buffer will be
 * created with malloc().
 *
 * @return False if allocation fails, otherwise True.
 **/
BOOL prs_init(prs_struct *ps, uint32 size, TALLOC_CTX *ctx, BOOL io)
{
      ZERO_STRUCTP(ps);
      ps->io = io;
      ps->bigendian_data = RPC_LITTLE_ENDIAN;
      ps->align = RPC_PARSE_ALIGN;
      ps->is_dynamic = False;
      ps->data_offset = 0;
      ps->buffer_size = 0;
      ps->data_p = NULL;
      ps->mem_ctx = ctx;

      if (size != 0) {
            ps->buffer_size = size;
            if((ps->data_p = (char *)malloc((size_t)size)) == NULL) {
                  DEBUG(0,("prs_init: malloc fail for %u bytes.\n", (unsigned int)size));
                  return False;
            }
            memset(ps->data_p, '\0', (size_t)size);
            ps->is_dynamic = True; /* We own this memory. */
      }

      return True;
}

/*******************************************************************
 read from a socket into memory.
 ********************************************************************/
BOOL prs_read(prs_struct *ps, int fd, size_t len, int timeout)
{
      BOOL ok;
      size_t prev_size = ps->buffer_size;
      if (!prs_grow(ps, len))
            return False;

      if (timeout > 0) {
            ok = (read_with_timeout(fd, &ps->data_p[prev_size],
                                        len, len,timeout) == len);
      } else {
            ok = (read_data(fd, &ps->data_p[prev_size], len) == len);
      }
      return ok;
}

/*******************************************************************
 Delete the memory in a parse structure - if we own it.
 ********************************************************************/

void prs_mem_free(prs_struct *ps)
{
      if(ps->is_dynamic)
            SAFE_FREE(ps->data_p);
      ps->is_dynamic = False;
      ps->buffer_size = 0;
      ps->data_offset = 0;
}

/*******************************************************************
 Clear the memory in a parse structure.
 ********************************************************************/

void prs_mem_clear(prs_struct *ps)
{
      memset(ps->data_p, '\0', (size_t)ps->buffer_size);
}

/*******************************************************************
 Allocate memory when unmarshalling... Always zero clears.
 ********************************************************************/

char *prs_alloc_mem(prs_struct *ps, size_t size)
{
      char *ret = talloc(ps->mem_ctx, size);

      if (ret)
            memset(ret, '\0', size);

      return ret;
}

/*******************************************************************
 Return the current talloc context we're using.
 ********************************************************************/

TALLOC_CTX *prs_get_mem_context(prs_struct *ps)
{
      return ps->mem_ctx;
}

/*******************************************************************
 Hand some already allocated memory to a prs_struct.
 ********************************************************************/

void prs_give_memory(prs_struct *ps, char *buf, uint32 size, BOOL is_dynamic)
{
      ps->is_dynamic = is_dynamic;
      ps->data_p = buf;
      ps->buffer_size = size;
}

/*******************************************************************
 Take some memory back from a prs_struct.
 ********************************************************************/

char *prs_take_memory(prs_struct *ps, uint32 *psize)
{
      char *ret = ps->data_p;
      if(psize)
            *psize = ps->buffer_size;
      ps->is_dynamic = False;
      prs_mem_free(ps);
      return ret;
}

/*******************************************************************
 Set a prs_struct to exactly a given size. Will grow or tuncate if neccessary.
 ********************************************************************/

BOOL prs_set_buffer_size(prs_struct *ps, uint32 newsize)
{
      if (newsize > ps->buffer_size)
            return prs_force_grow(ps, newsize - ps->buffer_size);

      if (newsize < ps->buffer_size) {
            char *new_data_p = Realloc(ps->data_p, newsize);
            /* if newsize is zero, Realloc acts like free() & returns NULL*/
            if (new_data_p == NULL && newsize != 0) {
                  DEBUG(0,("prs_set_buffer_size: Realloc failure for size %u.\n",
                        (unsigned int)newsize));
                  DEBUG(0,("prs_set_buffer_size: Reason %s\n",strerror(errno)));
                  return False;
            }
            ps->data_p = new_data_p;
            ps->buffer_size = newsize;
      }

      return True;
}

/*******************************************************************
 Attempt, if needed, to grow a data buffer.
 Also depends on the data stream mode (io).
 ********************************************************************/

BOOL prs_grow(prs_struct *ps, uint32 extra_space)
{
      uint32 new_size;
      char *new_data;

      ps->grow_size = MAX(ps->grow_size, ps->data_offset + extra_space);

      if(ps->data_offset + extra_space <= ps->buffer_size)
            return True;

      /*
       * We cannot grow the buffer if we're not reading
       * into the prs_struct, or if we don't own the memory.
       */

      if(UNMARSHALLING(ps) || !ps->is_dynamic) {
            DEBUG(0,("prs_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
                        (unsigned int)extra_space));
            return False;
      }
      
      /*
       * Decide how much extra space we really need.
       */

      extra_space -= (ps->buffer_size - ps->data_offset);
      if(ps->buffer_size == 0) {
            /*
             * Ensure we have at least a PDU's length, or extra_space, whichever
             * is greater.
             */

            new_size = MAX(MAX_PDU_FRAG_LEN,extra_space);

            if((new_data = (char *) malloc(new_size)) == NULL) {
                  DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size));
                  return False;
            }
            memset(new_data, '\0', (size_t)new_size );
      } else {
            /*
             * If the current buffer size is bigger than the space needed, just 
             * double it, else add extra_space.
             */
            new_size = MAX(ps->buffer_size*2, ps->buffer_size + extra_space);       

            if ((new_data = Realloc(ps->data_p, new_size)) == NULL) {
                  DEBUG(0,("prs_grow: Realloc failure for size %u.\n",
                        (unsigned int)new_size));
                  return False;
            }

            memset(&new_data[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
      }
      ps->buffer_size = new_size;
      ps->data_p = new_data;

      return True;
}

/*******************************************************************
 Attempt to force a data buffer to grow by len bytes.
 This is only used when appending more data onto a prs_struct
 when reading an rpc reply, before unmarshalling it.
 ********************************************************************/

BOOL prs_force_grow(prs_struct *ps, uint32 extra_space)
{
      uint32 new_size = ps->buffer_size + extra_space;
      char *new_data;

      if(!UNMARSHALLING(ps) || !ps->is_dynamic) {
            DEBUG(0,("prs_force_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
                        (unsigned int)extra_space));
            return False;
      }

      if((new_data = Realloc(ps->data_p, new_size)) == NULL) {
            DEBUG(0,("prs_force_grow: Realloc failure for size %u.\n",
                  (unsigned int)new_size));
            return False;
      }

      memset(&new_data[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));

      ps->buffer_size = new_size;
      ps->data_p = new_data;

      return True;
}

/*******************************************************************
 Get the data pointer (external interface).
 ********************************************************************/

char *prs_data_p(prs_struct *ps)
{
      return ps->data_p;
}

/*******************************************************************
 Get the current data size (external interface).
 ********************************************************************/

uint32 prs_data_size(prs_struct *ps)
{
      return ps->buffer_size;
}

/*******************************************************************
 Fetch the current offset (external interface).
 ********************************************************************/

uint32 prs_offset(prs_struct *ps)
{
      return ps->data_offset;
}

/*******************************************************************
 Set the current offset (external interface).
 ********************************************************************/

BOOL prs_set_offset(prs_struct *ps, uint32 offset)
{
      if(offset <= ps->data_offset) {
            ps->data_offset = offset;
            return True;
      }

      if(!prs_grow(ps, offset - ps->data_offset))
            return False;

      ps->data_offset = offset;
      return True;
}

/*******************************************************************
 Append the data from one parse_struct into another.
 ********************************************************************/

BOOL prs_append_prs_data(prs_struct *dst, prs_struct *src)
{
      if(!prs_grow(dst, prs_offset(src)))
            return False;

      memcpy(&dst->data_p[dst->data_offset], prs_data_p(src), (size_t)prs_offset(src));
      dst->data_offset += prs_offset(src);

      return True;
}

/*******************************************************************
 Append some data from one parse_struct into another.
 ********************************************************************/

BOOL prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start, uint32 len)
{     
      if (len == 0)
            return True;

      if(!prs_grow(dst, len))
            return False;
      
      memcpy(&dst->data_p[dst->data_offset], prs_data_p(src)+start, (size_t)len);
      dst->data_offset += len;

      return True;
}

/*******************************************************************
 Append the data from a buffer into a parse_struct.
 ********************************************************************/

BOOL prs_append_data(prs_struct *dst, char *src, uint32 len)
{
      if(!prs_grow(dst, len))
            return False;

      memcpy(&dst->data_p[dst->data_offset], src, (size_t)len);
      dst->data_offset += len;

      return True;
}

/*******************************************************************
 Set the data as X-endian (external interface).
 ********************************************************************/

void prs_set_endian_data(prs_struct *ps, BOOL endian)
{
      ps->bigendian_data = endian;
}

/*******************************************************************
 Align a the data_len to a multiple of align bytes - filling with
 zeros.
 ********************************************************************/

BOOL prs_align(prs_struct *ps)
{
      uint32 mod = ps->data_offset & (ps->align-1);

      if (ps->align != 0 && mod != 0) {
            uint32 extra_space = (ps->align - mod);
            if(!prs_grow(ps, extra_space))
                  return False;
            memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
            ps->data_offset += extra_space;
      }

      return True;
}

/******************************************************************
 Align on a 2 byte boundary
 *****************************************************************/

BOOL prs_align_uint16(prs_struct *ps)
{
      BOOL ret;
      uint8 old_align = ps->align;

      ps->align = 2;
      ret = prs_align(ps);
      ps->align = old_align;
      return ret;
}

/******************************************************************
 Align on a 8 byte boundary
 *****************************************************************/

BOOL prs_align_uint64(prs_struct *ps)
{
      BOOL ret;
      uint8 old_align = ps->align;

      ps->align = 8;
      ret = prs_align(ps);
      ps->align = old_align;
      return ret;
}

/*******************************************************************
 Align only if required (for the unistr2 string mainly)
 ********************************************************************/

BOOL prs_align_needed(prs_struct *ps, uint32 needed)
{
      if (needed==0)
            return True;
      else
            return prs_align(ps);
}

/*******************************************************************
 Ensure we can read/write to a given offset.
 ********************************************************************/

char *prs_mem_get(prs_struct *ps, uint32 extra_size)
{
      if(UNMARSHALLING(ps)) {
            /*
             * If reading, ensure that we can read the requested size item.
             */
            if (ps->data_offset + extra_size > ps->buffer_size) {
                  DEBUG(0,("prs_mem_get: reading data of size %u would overrun buffer.\n",
                              (unsigned int)extra_size ));
                  return NULL;
            }
      } else {
            /*
             * Writing - grow the buffer if needed.
             */
            if(!prs_grow(ps, extra_size))
                  return NULL;
      }
      return &ps->data_p[ps->data_offset];
}

/*******************************************************************
 Change the struct type.
 ********************************************************************/

void prs_switch_type(prs_struct *ps, BOOL io)
{
      if ((ps->io ^ io) == True)
            ps->io=io;
}

/*******************************************************************
 Force a prs_struct to be dynamic even when it's size is 0.
 ********************************************************************/

void prs_force_dynamic(prs_struct *ps)
{
      ps->is_dynamic=True;
}

/*******************************************************************
 Stream a uint8.
 ********************************************************************/

BOOL prs_uint8(const char *name, prs_struct *ps, int depth, uint8 *data8)
{
      char *q = prs_mem_get(ps, 1);
      if (q == NULL)
            return False;

    if (UNMARSHALLING(ps))
            *data8 = CVAL(q,0);
      else
            SCVAL(q,0,*data8);

    DEBUG(5,("%s%04x %s: %02x\n", tab_depth(depth), ps->data_offset, name, *data8));

      ps->data_offset += 1;

      return True;
}

/*******************************************************************
 Stream a uint16.
 ********************************************************************/

BOOL prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
{
      char *q = prs_mem_get(ps, sizeof(uint16));
      if (q == NULL)
            return False;

    if (UNMARSHALLING(ps)) {
            if (ps->bigendian_data)
                  *data16 = RSVAL(q,0);
            else
                  *data16 = SVAL(q,0);
    } else {
            if (ps->bigendian_data)
                  RSSVAL(q,0,*data16);
            else
                  SSVAL(q,0,*data16);
      }

      DEBUG(5,("%s%04x %s: %04x\n", tab_depth(depth), ps->data_offset, name, *data16));

      ps->data_offset += sizeof(uint16);

      return True;
}

/*******************************************************************
 Stream a uint32.
 ********************************************************************/

BOOL prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
{
      char *q = prs_mem_get(ps, sizeof(uint32));
      if (q == NULL)
            return False;

      if (UNMARSHALLING(ps)) {
            if (ps->bigendian_data)
                  *data32 = RIVAL(q,0);
            else
                  *data32 = IVAL(q,0);
      } else {
            if (ps->bigendian_data)
                  RSIVAL(q,0,*data32);
            else
                  SIVAL(q,0,*data32);
      }

      DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));

      ps->data_offset += sizeof(uint32);

      return True;
}

/*******************************************************************
 Stream a NTSTATUS
 ********************************************************************/

BOOL prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
{
      char *q = prs_mem_get(ps, sizeof(uint32));
      if (q == NULL)
            return False;

      if (UNMARSHALLING(ps)) {
            if (ps->bigendian_data)
                  *status = NT_STATUS(RIVAL(q,0));
            else
                  *status = NT_STATUS(IVAL(q,0));
      } else {
            if (ps->bigendian_data)
                  RSIVAL(q,0,NT_STATUS_V(*status));
            else
                  SIVAL(q,0,NT_STATUS_V(*status));
      }

      DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name, 
             get_nt_error_msg(*status)));

      ps->data_offset += sizeof(uint32);

      return True;
}

/*******************************************************************
 Stream a WERROR
 ********************************************************************/

BOOL prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
{
      char *q = prs_mem_get(ps, sizeof(uint32));
      if (q == NULL)
            return False;

      if (UNMARSHALLING(ps)) {
            if (ps->bigendian_data)
                  *status = W_ERROR(RIVAL(q,0));
            else
                  *status = W_ERROR(IVAL(q,0));
      } else {
            if (ps->bigendian_data)
                  RSIVAL(q,0,W_ERROR_V(*status));
            else
                  SIVAL(q,0,W_ERROR_V(*status));
      }

      DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name, 
             dos_errstr(*status)));

      ps->data_offset += sizeof(uint32);

      return True;
}


/******************************************************************
 Stream an array of uint8s. Length is number of uint8s.
 ********************************************************************/

BOOL prs_uint8s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
{
      int i;
      char *q = prs_mem_get(ps, len);
      if (q == NULL)
            return False;

      if (UNMARSHALLING(ps)) {
            for (i = 0; i < len; i++)
                  data8s[i] = CVAL(q,i);
      } else {
            for (i = 0; i < len; i++)
                  SCVAL(q, i, data8s[i]);
      }

    DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset ,name));
    if (charmode)
            print_asc(5, (unsigned char*)data8s, len);
      else {
      for (i = 0; i < len; i++)
                  DEBUG(5,("%02x ", data8s[i]));
      }
    DEBUG(5,("\n"));

      ps->data_offset += len;

      return True;
}

/******************************************************************
 Stream an array of uint16s. Length is number of uint16s.
 ********************************************************************/

BOOL prs_uint16s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
{
      int i;
      char *q = prs_mem_get(ps, len * sizeof(uint16));
      if (q == NULL)
            return False;

      if (UNMARSHALLING(ps)) {
            if (ps->bigendian_data) {
                  for (i = 0; i < len; i++)
                        data16s[i] = RSVAL(q, 2*i);
            } else {
                  for (i = 0; i < len; i++)
                        data16s[i] = SVAL(q, 2*i);
            }
      } else {
            if (ps->bigendian_data) {
                  for (i = 0; i < len; i++)
                        RSSVAL(q, 2*i, data16s[i]);
            } else {
                  for (i = 0; i < len; i++)
                        SSVAL(q, 2*i, data16s[i]);
            }
      }

      DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
      if (charmode)
            print_asc(5, (unsigned char*)data16s, 2*len);
      else {
            for (i = 0; i < len; i++)
                  DEBUG(5,("%04x ", data16s[i]));
      }
    DEBUG(5,("\n"));

      ps->data_offset += (len * sizeof(uint16));

      return True;
}

/******************************************************************
 Start using a function for streaming unicode chars. If unmarshalling,
 output must be little-endian, if marshalling, input must be little-endian.
 ********************************************************************/

static void dbg_rw_punival(BOOL charmode, const char *name, int depth, prs_struct *ps,
                                          char *in_buf, char *out_buf, int len)
{
      int i;

      if (UNMARSHALLING(ps)) {
            if (ps->bigendian_data) {
                  for (i = 0; i < len; i++)
                        SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
            } else {
                  for (i = 0; i < len; i++)
                        SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
            }
      } else {
            if (ps->bigendian_data) {
                  for (i = 0; i < len; i++)
                        RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
            } else {
                  for (i = 0; i < len; i++)
                        SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
            }
      }

      DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
      if (charmode)
            print_asc(5, (unsigned char*)out_buf, 2*len);
      else {
            for (i = 0; i < len; i++)
                  DEBUG(5,("%04x ", out_buf[i]));
      }
    DEBUG(5,("\n"));
}

/******************************************************************
 Stream a unistr. Always little endian.
 ********************************************************************/

BOOL prs_uint16uni(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
{
      char *q = prs_mem_get(ps, len * sizeof(uint16));
      if (q == NULL)
            return False;

      dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
      ps->data_offset += (len * sizeof(uint16));

      return True;
}

/******************************************************************
 Stream an array of uint32s. Length is number of uint32s.
 ********************************************************************/

BOOL prs_uint32s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
{
      int i;
      char *q = prs_mem_get(ps, len * sizeof(uint32));
      if (q == NULL)
            return False;

      if (UNMARSHALLING(ps)) {
            if (ps->bigendian_data) {
                  for (i = 0; i < len; i++)
                        data32s[i] = RIVAL(q, 4*i);
            } else {
                  for (i = 0; i < len; i++)
                        data32s[i] = IVAL(q, 4*i);
            }
      } else {
            if (ps->bigendian_data) {
                  for (i = 0; i < len; i++)
                        RSIVAL(q, 4*i, data32s[i]);
            } else {
                  for (i = 0; i < len; i++)
                        SIVAL(q, 4*i, data32s[i]);
            }
      }

      DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
      if (charmode)
            print_asc(5, (unsigned char*)data32s, 4*len);
      else {
            for (i = 0; i < len; i++)
                  DEBUG(5,("%08x ", data32s[i]));
      }
    DEBUG(5,("\n"));

      ps->data_offset += (len * sizeof(uint32));

      return True;
}

/******************************************************************
 Stream an array of unicode string, length/buffer specified separately,
 in uint16 chars. The unicode string is already in little-endian format.
 ********************************************************************/

BOOL prs_buffer5(BOOL charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
{
      char *p;
      char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
      if (q == NULL)
            return False;

      if (UNMARSHALLING(ps)) {
            str->buffer = (uint16 *)prs_alloc_mem(ps,str->buf_len * sizeof(uint16));
            if (str->buffer == NULL)
                  return False;
      }

      /* If the string is empty, we don't have anything to stream */
      if (str->buf_len==0)
            return True;

      p = (char *)str->buffer;

      dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
      
      ps->data_offset += (str->buf_len * sizeof(uint16));

      return True;
}

/******************************************************************
 Stream a "not" unicode string, length/buffer specified separately,
 in byte chars. String is in little-endian format.
 ********************************************************************/

BOOL prs_buffer2(BOOL charmode, const char *name, prs_struct *ps, int depth, BUFFER2 *str)
{
      char *p;
      char *q = prs_mem_get(ps, str->buf_len);
      if (q == NULL)
            return False;

      if (UNMARSHALLING(ps)) {
            str->buffer = (uint16 *)prs_alloc_mem(ps,str->buf_len);
            if (str->buffer == NULL)
                  return False;
      }

      p = (char *)str->buffer;

      dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len/2);
      ps->data_offset += str->buf_len;

      return True;
}

/******************************************************************
 Stream a string, length/buffer specified separately,
 in uint8 chars.
 ********************************************************************/

BOOL prs_string2(BOOL charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
{
      int i;
      char *q = prs_mem_get(ps, str->str_max_len);
      if (q == NULL)
            return False;

      if (UNMARSHALLING(ps)) {
            str->buffer = (unsigned char *)prs_alloc_mem(ps,str->str_max_len);
            if (str->buffer == NULL)
                  return False;
      }

      if (UNMARSHALLING(ps)) {
            for (i = 0; i < str->str_str_len; i++)
                  str->buffer[i] = CVAL(q,i);
      } else {
            for (i = 0; i < str->str_str_len; i++)
                  SCVAL(q, i, str->buffer[i]);
      }

    DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
    if (charmode)
            print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
      else {
      for (i = 0; i < str->str_str_len; i++)
                  DEBUG(5,("%02x ", str->buffer[i]));
      }
    DEBUG(5,("\n"));

      ps->data_offset += str->str_str_len;

      return True;
}

/******************************************************************
 Stream a unicode string, length/buffer specified separately,
 in uint16 chars. The unicode string is already in little-endian format.
 ********************************************************************/

BOOL prs_unistr2(BOOL charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
{
      char *p;
      char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
      if (q == NULL)
            return False;

      /* If the string is empty, we don't have anything to stream */
      if (str->uni_str_len==0)
            return True;

      if (UNMARSHALLING(ps)) {
            str->buffer = (uint16 *)prs_alloc_mem(ps,str->uni_max_len * sizeof(uint16));
            if (str->buffer == NULL)
                  return False;
      }

      p = (char *)str->buffer;

      dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
      
      ps->data_offset += (str->uni_str_len * sizeof(uint16));

      return True;
}

/******************************************************************
 Stream a unicode string, length/buffer specified separately,
 in uint16 chars. The unicode string is already in little-endian format.
 ********************************************************************/

BOOL prs_unistr3(BOOL charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
{
      char *p;
      char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
      if (q == NULL)
            return False;

      if (UNMARSHALLING(ps)) {
            str->str.buffer = (uint16 *)prs_alloc_mem(ps,str->uni_str_len * sizeof(uint16));
            if (str->str.buffer == NULL)
                  return False;
      }

      p = (char *)str->str.buffer;

      dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
      ps->data_offset += (str->uni_str_len * sizeof(uint16));

      return True;
}

/*******************************************************************
 Stream a unicode  null-terminated string. As the string is already
 in little-endian format then do it as a stream of bytes.
 ********************************************************************/

BOOL prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
{
      int len = 0;
      unsigned char *p = (unsigned char *)str->buffer;
      uint8 *start;
      char *q;
      uint32 max_len;
      uint16* ptr;

      if (MARSHALLING(ps)) {

            for(len = 0; str->buffer[len] != 0; len++)
                  ;

            q = prs_mem_get(ps, (len+1)*2);
            if (q == NULL)
                  return False;

            start = (uint8*)q;

            for(len = 0; str->buffer[len] != 0; len++) 
            {
                  if(ps->bigendian_data) 
                  {
                        /* swap bytes - p is little endian, q is big endian. */
                        q[0] = (char)p[1];
                        q[1] = (char)p[0];
                        p += 2;
                        q += 2;
                  } 
                  else 
                  {
                        q[0] = (char)p[0];
                        q[1] = (char)p[1];
                        p += 2;
                        q += 2;
                  }
            }

            /*
             * even if the string is 'empty' (only an \0 char)
             * at this point the leading \0 hasn't been parsed.
             * so parse it now
             */

            q[0] = 0;
            q[1] = 0;
            q += 2;

            len++;

            dump_data(5+depth, (char *)start, len * 2);
      }
      else { /* unmarshalling */
      
            uint32 alloc_len = 0;
            q = prs_data_p(ps) + prs_offset(ps);

            /*
             * Work out how much space we need and talloc it.
             */
            max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);

            /* the test of the value of *ptr helps to catch the circumstance
               where we have an emtpty (non-existent) string in the buffer */
            for ( ptr = (uint16 *)q; *ptr && (alloc_len <= max_len); alloc_len++)
                  /* do nothing */ 
                  ;

            /* should we allocate anything at all? */
            str->buffer = (uint16 *)prs_alloc_mem(ps,alloc_len * sizeof(uint16));
            if ((str->buffer == NULL) && (alloc_len > 0))
                  return False;

            p = (unsigned char *)str->buffer;

            len = 0;
            /* the (len < alloc_len) test is to prevent us from overwriting
               memory that is not ours...if we get that far, we have a non-null
               terminated string in the buffer and have messed up somewhere */
            while ((len < alloc_len) && (*(uint16 *)q != 0))
            {
                  if(ps->bigendian_data) 
                  {
                        /* swap bytes - q is big endian, p is little endian. */
                        p[0] = (unsigned char)q[1];
                        p[1] = (unsigned char)q[0];
                        p += 2;
                        q += 2;
                  } else {

                        p[0] = (unsigned char)q[0];
                        p[1] = (unsigned char)q[1];
                        p += 2;
                        q += 2;
                  }

                  len++;
            } 
            if (len < alloc_len)
            {
                  /* NULL terminate the UNISTR */
                  str->buffer[len++] = '\0';
            }
      }

      /* set the offset in the prs_struct; 'len' points to the
         terminiating NULL in the UNISTR so we need to go one more
         uint16 */
      ps->data_offset += (len)*2;
      
      return True;
}


/*******************************************************************
 Stream a null-terminated string.  len is strlen, and therefore does
 not include the null-termination character.
 ********************************************************************/

BOOL prs_string(const char *name, prs_struct *ps, int depth, char *str, int len, int max_buf_size)
{
      char *q;
      int i;

      len = MIN(len, (max_buf_size-1));

      q = prs_mem_get(ps, len+1);
      if (q == NULL)
            return False;

      for(i = 0; i < len; i++) {
            if (UNMARSHALLING(ps))
                  str[i] = q[i];
            else
                  q[i] = str[i];
      }

      /* The terminating null. */
      str[i] = '\0';

      if (MARSHALLING(ps)) {
            q[i] = '\0';
      }

      ps->data_offset += len+1;

      dump_data(5+depth, q, len);

      return True;
}

/*******************************************************************
 prs_uint16 wrapper. Call this and it sets up a pointer to where the
 uint16 should be stored, or gets the size if reading.
 ********************************************************************/

BOOL prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
{
      *offset = ps->data_offset;
      if (UNMARSHALLING(ps)) {
            /* reading. */
            return prs_uint16(name, ps, depth, data16);
      } else {
            char *q = prs_mem_get(ps, sizeof(uint16));
            if(q ==NULL)
                  return False;
            ps->data_offset += sizeof(uint16);
      }
      return True;
}

/*******************************************************************
 prs_uint16 wrapper.  call this and it retrospectively stores the size.
 does nothing on reading, as that is already handled by ...._pre()
 ********************************************************************/

BOOL prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
                        uint32 ptr_uint16, uint32 start_offset)
{
      if (MARSHALLING(ps)) {
            /* 
             * Writing - temporarily move the offset pointer.
             */
            uint16 data_size = ps->data_offset - start_offset;
            uint32 old_offset = ps->data_offset;

            ps->data_offset = ptr_uint16;
            if(!prs_uint16(name, ps, depth, &data_size)) {
                  ps->data_offset = old_offset;
                  return False;
            }
            ps->data_offset = old_offset;
      } else {
            ps->data_offset = start_offset + (uint32)(*data16);
      }
      return True;
}

/*******************************************************************
 prs_uint32 wrapper. Call this and it sets up a pointer to where the
 uint32 should be stored, or gets the size if reading.
 ********************************************************************/

BOOL prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
{
      *offset = ps->data_offset;
      if (UNMARSHALLING(ps) && (data32 != NULL)) {
            /* reading. */
            return prs_uint32(name, ps, depth, data32);
      } else {
            ps->data_offset += sizeof(uint32);
      }
      return True;
}

/*******************************************************************
 prs_uint32 wrapper.  call this and it retrospectively stores the size.
 does nothing on reading, as that is already handled by ...._pre()
 ********************************************************************/

BOOL prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
                        uint32 ptr_uint32, uint32 data_size)
{
      if (MARSHALLING(ps)) {
            /* 
             * Writing - temporarily move the offset pointer.
             */
            uint32 old_offset = ps->data_offset;
            ps->data_offset = ptr_uint32;
            if(!prs_uint32(name, ps, depth, &data_size)) {
                  ps->data_offset = old_offset;
                  return False;
            }
            ps->data_offset = old_offset;
      }
      return True;
}

/* useful function to store a structure in rpc wire format */
int tdb_prs_store(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps)
{
    TDB_KEY kbuf;
    TDB_DATA dbuf;
    kbuf.dptr = keystr;
    kbuf.dsize = strlen(keystr)+1;
    dbuf.dptr = prs_data_p(ps);
    dbuf.dsize = prs_offset(ps);
    return tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
}

/* useful function to fetch a structure into rpc wire format */
int tdb_prs_fetch(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps, TALLOC_CTX *mem_ctx)
{
    TDB_KEY kbuf;
    TDB_DATA dbuf;
    kbuf.dptr = keystr;
    kbuf.dsize = strlen(keystr)+1;

    dbuf = tdb_fetch(tdb, kbuf);
    if (!dbuf.dptr) return -1;

    ZERO_STRUCTP(ps);
    prs_init(ps, 0, mem_ctx, UNMARSHALL);
    prs_give_memory(ps, dbuf.dptr, dbuf.dsize, True);

    return 0;
} 

/*******************************************************************
 hash a stream.
 ********************************************************************/
BOOL prs_hash1(prs_struct *ps, uint32 offset, uint8 *sess_key)
{
      char *q;

      q = prs_data_p(ps);
        q = &q[offset];

#ifdef DEBUG_PASSWORD
      DEBUG(100, ("prs_hash1\n"));
      dump_data(100, sess_key, 16);
      dump_data(100, q, 68);
#endif
      SamOEMhash((uchar *) q, sess_key, 68);

#ifdef DEBUG_PASSWORD
      dump_data(100, q, 68);
#endif

      return True;
}

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