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glibc  2.9
Classes | Defines | Typedefs | Functions | Variables
xdr_rec.c File Reference
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <libintl.h>

Go to the source code of this file.

Classes

struct  rec_strm

Defines

#define LAST_FRAG   (1UL << 31)

Typedefs

typedef struct rec_strm RECSTREAM

Functions

static bool_t xdrrec_getlong (XDR *, long *)
static bool_t xdrrec_putlong (XDR *, const long *)
static bool_t xdrrec_getbytes (XDR *, caddr_t, u_int)
static bool_t xdrrec_putbytes (XDR *, const char *, u_int)
static u_int xdrrec_getpos (const XDR *)
static bool_t xdrrec_setpos (XDR *, u_int)
static int32_txdrrec_inline (XDR *, u_int)
static void xdrrec_destroy (XDR *)
static bool_t xdrrec_getint32 (XDR *, int32_t *)
static bool_t xdrrec_putint32 (XDR *, const int32_t *)
static u_int fix_buf_size (u_int)
bool_t xdrrec_skiprecord (XDR *xdrs)
bool_t xdrrec_eof (XDR *xdrs)
bool_t xdrrec_endofrecord (XDR *xdrs, bool_t sendnow)
static bool_t internal_function flush_out (RECSTREAM *rstrm, bool_t eor)
static bool_t fill_input_buf (RECSTREAM *rstrm)
static bool_t internal_function get_input_bytes (RECSTREAM *rstrm, caddr_t addr, int len)
static bool_t internal_function set_input_fragment (RECSTREAM *rstrm)
static bool_t internal_function skip_input_bytes (RECSTREAM *rstrm, long cnt)

Variables

static struct xdr_ops

Define Documentation

#define LAST_FRAG   (1UL << 31)

Definition at line 95 of file xdr_rec.c.


Typedef Documentation

typedef struct rec_strm RECSTREAM

Function Documentation

static bool_t fill_input_buf ( RECSTREAM rstrm) [static]

Definition at line 561 of file xdr_rec.c.

{
  caddr_t where;
  size_t i;
  int len;

  where = rstrm->in_base;
  i = (size_t) rstrm->in_boundry % BYTES_PER_XDR_UNIT;
  where += i;
  len = rstrm->in_size - i;
  if ((len = (*(rstrm->readit)) (rstrm->tcp_handle, where, len)) == -1)
    return FALSE;
  rstrm->in_finger = where;
  where += len;
  rstrm->in_boundry = where;
  return TRUE;
}

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static u_int internal_function fix_buf_size ( u_int  s) [static]

Definition at line 125 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) mem_alloc (sizeof (RECSTREAM));
  caddr_t tmp;
  char *buf;

  sendsize = fix_buf_size (sendsize);
  recvsize = fix_buf_size (recvsize);
  buf = mem_alloc (sendsize + recvsize + BYTES_PER_XDR_UNIT);

  if (rstrm == NULL || buf == NULL)
    {
      (void) __fxprintf (NULL, "%s: %s", __func__, _("out of memory\n"));
      mem_free (rstrm, sizeof (RECSTREAM));
      mem_free (buf, sendsize + recvsize + BYTES_PER_XDR_UNIT);
      /*
       *  This is bad.  Should rework xdrrec_create to
       *  return a handle, and in this case return NULL
       */
      return;
    }
  /*
   * adjust sizes and allocate buffer quad byte aligned
   */
  rstrm->sendsize = sendsize;
  rstrm->recvsize = recvsize;
  rstrm->the_buffer = buf;
  tmp = rstrm->the_buffer;
  if ((size_t)tmp % BYTES_PER_XDR_UNIT)
    tmp += BYTES_PER_XDR_UNIT - (size_t)tmp % BYTES_PER_XDR_UNIT;
  rstrm->out_base = tmp;
  rstrm->in_base = tmp + sendsize;
  /*
   * now the rest ...
   */
  /* We have to add the cast since the `struct xdr_ops' in `struct XDR'
     is not `const'.  */
  xdrs->x_ops = (struct xdr_ops *) &xdrrec_ops;
  xdrs->x_private = (caddr_t) rstrm;
  rstrm->tcp_handle = tcp_handle;
  rstrm->readit = readit;
  rstrm->writeit = writeit;
  rstrm->out_finger = rstrm->out_boundry = rstrm->out_base;
  rstrm->frag_header = (u_int32_t *) rstrm->out_base;
  rstrm->out_finger += 4;
  rstrm->out_boundry += sendsize;
  rstrm->frag_sent = FALSE;
  rstrm->in_size = recvsize;
  rstrm->in_boundry = rstrm->in_base;
  rstrm->in_finger = (rstrm->in_boundry += recvsize);
  rstrm->fbtbc = 0;
  rstrm->last_frag = TRUE;
}
static bool_t internal_function flush_out ( RECSTREAM rstrm,
bool_t  eor 
) [static]

Definition at line 544 of file xdr_rec.c.

{
  u_long eormask = (eor == TRUE) ? LAST_FRAG : 0;
  u_long len = (rstrm->out_finger - (char *) rstrm->frag_header
              - BYTES_PER_XDR_UNIT);

  *rstrm->frag_header = htonl (len | eormask);
  len = rstrm->out_finger - rstrm->out_base;
  if ((*(rstrm->writeit)) (rstrm->tcp_handle, rstrm->out_base, (int) len)
      != (int) len)
    return FALSE;
  rstrm->frag_header = (u_int32_t *) rstrm->out_base;
  rstrm->out_finger = (caddr_t) rstrm->out_base + BYTES_PER_XDR_UNIT;
  return TRUE;
}

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static bool_t internal_function get_input_bytes ( RECSTREAM rstrm,
caddr_t  addr,
int  len 
) [static]

Definition at line 581 of file xdr_rec.c.

{
  int current;

  while (len > 0)
    {
      current = rstrm->in_boundry - rstrm->in_finger;
      if (current == 0)
       {
         if (!fill_input_buf (rstrm))
           return FALSE;
         continue;
       }
      current = (len < current) ? len : current;
      memcpy (addr, rstrm->in_finger, current);
      rstrm->in_finger += current;
      addr += current;
      len -= current;
    }
  return TRUE;
}

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static bool_t internal_function set_input_fragment ( RECSTREAM rstrm) [static]

Definition at line 605 of file xdr_rec.c.

{
  uint32_t header;

  if (! get_input_bytes (rstrm, (caddr_t)&header, BYTES_PER_XDR_UNIT))
    return FALSE;
  header = ntohl (header);
  rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE;
  /*
   * Sanity check. Try not to accept wildly incorrect fragment
   * sizes. Unfortunately, only a size of zero can be identified as
   * 'wildely incorrect', and this only, if it is not the last
   * fragment of a message. Ridiculously large fragment sizes may look
   * wrong, but we don't have any way to be certain that they aren't
   * what the client actually intended to send us. Many existing RPC
   * implementations may sent a fragment of size zero as the last
   * fragment of a message.
   */
  if (header == 0)
    return FALSE;
  rstrm->fbtbc = header & ~LAST_FRAG;
  return TRUE;
}

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static bool_t internal_function skip_input_bytes ( RECSTREAM rstrm,
long  cnt 
) [static]

Definition at line 631 of file xdr_rec.c.

{
  int current;

  while (cnt > 0)
    {
      current = rstrm->in_boundry - rstrm->in_finger;
      if (current == 0)
       {
         if (!fill_input_buf (rstrm))
           return FALSE;
         continue;
       }
      current = (cnt < current) ? cnt : current;
      rstrm->in_finger += current;
      cnt -= current;
    }
  return TRUE;
}

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static void xdrrec_destroy ( XDR xdrs) [static]

Definition at line 404 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;

  mem_free (rstrm->the_buffer,
           rstrm->sendsize + rstrm->recvsize + BYTES_PER_XDR_UNIT);
  mem_free ((caddr_t) rstrm, sizeof (RECSTREAM));
}
bool_t xdrrec_endofrecord ( XDR xdrs,
bool_t  sendnow 
)

Definition at line 518 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
  u_long len;        /* fragment length */

  if (sendnow || rstrm->frag_sent
      || rstrm->out_finger + BYTES_PER_XDR_UNIT >= rstrm->out_boundry)
    {
      rstrm->frag_sent = FALSE;
      return flush_out (rstrm, TRUE);
    }
  len = (rstrm->out_finger - (char *) rstrm->frag_header
        - BYTES_PER_XDR_UNIT);
  *rstrm->frag_header = htonl ((u_long) len | LAST_FRAG);
  rstrm->frag_header = (u_int32_t *) rstrm->out_finger;
  rstrm->out_finger += BYTES_PER_XDR_UNIT;
  return TRUE;
}

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bool_t xdrrec_eof ( XDR xdrs)

Definition at line 493 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;

  while (rstrm->fbtbc > 0 || (!rstrm->last_frag))
    {
      if (!skip_input_bytes (rstrm, rstrm->fbtbc))
       return TRUE;
      rstrm->fbtbc = 0;
      if ((!rstrm->last_frag) && (!set_input_fragment (rstrm)))
       return TRUE;
    }
  if (rstrm->in_finger == rstrm->in_boundry)
    return TRUE;
  return FALSE;
}

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static bool_t xdrrec_getbytes ( XDR xdrs,
caddr_t  addr,
u_int  len 
) [static]

Definition at line 254 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
  u_int current;

  while (len > 0)
    {
      current = rstrm->fbtbc;
      if (current == 0)
       {
         if (rstrm->last_frag)
           return FALSE;
         if (!set_input_fragment (rstrm))
           return FALSE;
         continue;
       }
      current = (len < current) ? len : current;
      if (!get_input_bytes (rstrm, addr, current))
       return FALSE;
      addr += current;
      rstrm->fbtbc -= current;
      len -= current;
    }
  return TRUE;
}

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static bool_t xdrrec_getint32 ( XDR xdrs,
int32_t ip 
) [static]

Definition at line 414 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
  int32_t *bufip = (int32_t *) rstrm->in_finger;
  int32_t mylong;

  /* first try the inline, fast case */
  if (rstrm->fbtbc >= BYTES_PER_XDR_UNIT &&
      rstrm->in_boundry - (char *) bufip >= BYTES_PER_XDR_UNIT)
    {
      *ip = ntohl (*bufip);
      rstrm->fbtbc -= BYTES_PER_XDR_UNIT;
      rstrm->in_finger += BYTES_PER_XDR_UNIT;
    }
  else
    {
      if (!xdrrec_getbytes (xdrs, (caddr_t) &mylong,
                         BYTES_PER_XDR_UNIT))
       return FALSE;
      *ip = ntohl (mylong);
    }
  return TRUE;
}

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static bool_t xdrrec_getlong ( XDR xdrs,
long *  lp 
) [static]

Definition at line 206 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
  int32_t *buflp = (int32_t *) rstrm->in_finger;
  int32_t mylong;

  /* first try the inline, fast case */
  if (rstrm->fbtbc >= BYTES_PER_XDR_UNIT &&
      rstrm->in_boundry - (char *) buflp >= BYTES_PER_XDR_UNIT)
    {
      *lp = (int32_t) ntohl (*buflp);
      rstrm->fbtbc -= BYTES_PER_XDR_UNIT;
      rstrm->in_finger += BYTES_PER_XDR_UNIT;
    }
  else
    {
      if (!xdrrec_getbytes (xdrs, (caddr_t) & mylong,
                         BYTES_PER_XDR_UNIT))
       return FALSE;
      *lp = (int32_t) ntohl (mylong);
    }
  return TRUE;
}

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static u_int xdrrec_getpos ( const XDR xdrs) [static]

Definition at line 305 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
  long pos;

  pos = __lseek ((int) (long) rstrm->tcp_handle, (long) 0, 1);
  if (pos != -1)
    switch (xdrs->x_op)
      {

      case XDR_ENCODE:
       pos += rstrm->out_finger - rstrm->out_base;
       break;

      case XDR_DECODE:
       pos -= rstrm->in_boundry - rstrm->in_finger;
       break;

      default:
       pos = (u_int) - 1;
       break;
      }
  return (u_int) pos;
}

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static int32_t * xdrrec_inline ( XDR xdrs,
u_int  len 
) [static]

Definition at line 371 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
  int32_t *buf = NULL;

  switch (xdrs->x_op)
    {

    case XDR_ENCODE:
      if ((rstrm->out_finger + len) <= rstrm->out_boundry)
       {
         buf = (int32_t *) rstrm->out_finger;
         rstrm->out_finger += len;
       }
      break;

    case XDR_DECODE:
      if ((len <= rstrm->fbtbc) &&
         ((rstrm->in_finger + len) <= rstrm->in_boundry))
       {
         buf = (int32_t *) rstrm->in_finger;
         rstrm->fbtbc -= len;
         rstrm->in_finger += len;
       }
      break;

    default:
      break;
    }
  return buf;
}
static bool_t xdrrec_putbytes ( XDR xdrs,
const char *  addr,
u_int  len 
) [static]

Definition at line 281 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
  u_int current;

  while (len > 0)
    {
      current = rstrm->out_boundry - rstrm->out_finger;
      current = (len < current) ? len : current;
      memcpy (rstrm->out_finger, addr, current);
      rstrm->out_finger += current;
      addr += current;
      len -= current;
      if (rstrm->out_finger == rstrm->out_boundry && len > 0)
       {
         rstrm->frag_sent = TRUE;
         if (!flush_out (rstrm, FALSE))
           return FALSE;
       }
    }
  return TRUE;
}

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static bool_t xdrrec_putint32 ( XDR xdrs,
const int32_t ip 
) [static]

Definition at line 439 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
  int32_t *dest_ip = (int32_t *) rstrm->out_finger;

  if ((rstrm->out_finger += BYTES_PER_XDR_UNIT) > rstrm->out_boundry)
    {
      /*
       * this case should almost never happen so the code is
       * inefficient
       */
      rstrm->out_finger -= BYTES_PER_XDR_UNIT;
      rstrm->frag_sent = TRUE;
      if (!flush_out (rstrm, FALSE))
       return FALSE;
      dest_ip = (int32_t *) rstrm->out_finger;
      rstrm->out_finger += BYTES_PER_XDR_UNIT;
    }
  *dest_ip = htonl (*ip);
  return TRUE;
}

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static bool_t xdrrec_putlong ( XDR xdrs,
const long *  lp 
) [static]

Definition at line 231 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
  int32_t *dest_lp = (int32_t *) rstrm->out_finger;

  if ((rstrm->out_finger += BYTES_PER_XDR_UNIT) > rstrm->out_boundry)
    {
      /*
       * this case should almost never happen so the code is
       * inefficient
       */
      rstrm->out_finger -= BYTES_PER_XDR_UNIT;
      rstrm->frag_sent = TRUE;
      if (!flush_out (rstrm, FALSE))
       return FALSE;
      dest_lp = (int32_t *) rstrm->out_finger;
      rstrm->out_finger += BYTES_PER_XDR_UNIT;
    }
  *dest_lp = htonl (*lp);
  return TRUE;
}

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static bool_t xdrrec_setpos ( XDR xdrs,
u_int  pos 
) [static]

Definition at line 331 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
  u_int currpos = xdrrec_getpos (xdrs);
  int delta = currpos - pos;
  caddr_t newpos;

  if ((int) currpos != -1)
    switch (xdrs->x_op)
      {

      case XDR_ENCODE:
       newpos = rstrm->out_finger - delta;
       if (newpos > (caddr_t) rstrm->frag_header &&
           newpos < rstrm->out_boundry)
         {
           rstrm->out_finger = newpos;
           return TRUE;
         }
       break;

      case XDR_DECODE:
       newpos = rstrm->in_finger - delta;
       if ((delta < (int) (rstrm->fbtbc)) &&
           (newpos <= rstrm->in_boundry) &&
           (newpos >= rstrm->in_base))
         {
           rstrm->in_finger = newpos;
           rstrm->fbtbc -= delta;
           return TRUE;
         }
       break;

      default:
       break;
      }
  return FALSE;
}

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Definition at line 470 of file xdr_rec.c.

{
  RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;

  while (rstrm->fbtbc > 0 || (!rstrm->last_frag))
    {
      if (!skip_input_bytes (rstrm, rstrm->fbtbc))
       return FALSE;
      rstrm->fbtbc = 0;
      if ((!rstrm->last_frag) && (!set_input_fragment (rstrm)))
       return FALSE;
    }
  rstrm->last_frag = FALSE;
  return TRUE;
}

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Variable Documentation

struct xdr_ops [static]