static bool /* must manage buffers, fragments, and records */
xdr_inrec_getbytes(XDR *xdrs, char *addr, u_int len)
{
RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
int current;
while (len > 0) {
current = (int)rstrm->fbtbc;
if (current == 0) {
if (rstrm->last_frag)
return (FALSE);
if (! set_input_fragment(rstrm, INT_MAX))
return (FALSE);
continue;
}
current = (len < current) ? len : current;
if (! get_input_bytes(rstrm, addr, current, INT_MAX))
return (FALSE);
addr += current;
rstrm->fbtbc -= current;
len -= current;
/* handle checksumming if requested */
if (xdrs->x_flags & XDR_FLAG_CKSUM) {
if (rstrm->cklen) {
if (! (rstrm->cksum)) {
if (rstrm->offset >= rstrm->cklen) {
compute_buffer_cksum(rstrm);
}
}
}
}
}
return (TRUE);
}
static bool_t /* must manage buffers, fragments, and records */
xdrrec_getbytes(
XDR *xdrs,
void *baddr,
uint_t len)
{
char *addr = baddr;
RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
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);
}
static bool_t /* next two bytes of the input stream are treated as a header */
set_input_fragment(RECSTREAM *rstrm)
{
uint32_t header;
if (rstrm->nonblock)
return FALSE;
if (! get_input_bytes(rstrm, (char *)(void *)&header,
(u_int)sizeof(header)))
return (FALSE);
header = ntohl(header);
rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE;
/*
* Sanity check. Try not to accept wildly incorrect
* record sizes. Unfortunately, the only record size
* we can positively identify as being 'wildly incorrect'
* is zero. Ridiculously large record 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.
*/
if (header == 0)
return(FALSE);
rstrm->fbtbc = header & (~LAST_FRAG);
return (TRUE);
}
/*
* This is just like the ops vector x_getbytes(), except that
* instead of returning success or failure on getting a certain number
* of bytes, it behaves much more like the read() system call against a
* pipe -- it returns up to the number of bytes requested and a return of
* zero indicates end-of-record. A -1 means something very bad happened.
*/
XDR_API u_int /* must manage buffers, fragments, and records */
xdrrec_readbytes(XDR *xdrs, caddr_t addr, u_int l)
{
/* LINTED pointer cast */
RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
int current, len;
len = l;
while (len > 0) {
current = rstrm->fbtbc;
if (current == 0) {
if (rstrm->last_frag)
return (l - len);
if (!set_input_fragment(rstrm))
return ((u_int)-1);
continue;
}
current = (len < current) ? len : current;
if (!get_input_bytes(rstrm, addr, current, FALSE))
return ((u_int)-1);
addr += current;
rstrm->fbtbc -= current;
len -= current;
}
return (l - len);
}
static bool_t /* must manage buffers, fragments, and records */
xdrrec_getbytes(
XDR *xdrs,
register char* addr,
register unsigned len)
{
register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
register int current;
while (len != 0) {
current = (int)rstrm->fbtbc;
if (current == 0) {
if (rstrm->last_frag)
return (FALSE);
if (! set_input_fragment(rstrm))
return (FALSE);
continue;
}
current = (len < current) ? (int)len : current;
if (! get_input_bytes(rstrm, addr, current))
return (FALSE);
addr += current;
rstrm->fbtbc -= current;
len -= current;
}
return (TRUE);
}
static bool_t /* next two bytes of the input stream are treated as a header */
set_input_fragment(
RECSTREAM *rstrm)
{
uint32_t header;
if (! get_input_bytes(rstrm, (void *)&header, sizeof(header)))
return (FALSE);
header = (int32_t)ntohl(header);
rstrm->last_frag = ((header & (uint32_t)LAST_FRAG) == 0) ? FALSE : TRUE;
rstrm->fbtbc = header & (~LAST_FRAG);
return (TRUE);
}
static bool_t /* next 32-bits of the input stream are treated as a header */
set_input_fragment(
register RECSTREAM *rstrm)
{
uint32_t header;
if (! get_input_bytes(rstrm, (char*)&header, sizeof(header)))
return (FALSE);
header = ntohl(header);
rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE;
rstrm->fbtbc = header & (~LAST_FRAG);
return (TRUE);
}
static bool_t /* next four bytes of the input stream are treated as a header */
set_input_fragment(RECSTREAM *rstrm)
{
uint32_t header;
if (! get_input_bytes(rstrm, (caddr_t)&header, 0, sizeof (header)))
return (FALSE);
header = (uint32_t)ntohl(header);
rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE;
rstrm->fbtbc = header & (~LAST_FRAG);
#ifdef DEBUG
printf("set_input_fragment: frag_len = %d, last frag = %s\n",
rstrm->fbtbc, rstrm->last_frag ? "TRUE" : "FALSE");
#endif
return (TRUE);
}
/* next four bytes of the input stream are treated as a header */
static bool_t
set_input_fragment(RECSTREAM *rstrm)
{
uint32_t header;
if (rstrm->in_nonblock) {
/*
* In the non-blocking case, the fragment headers should
* already have been consumed, so we should never get
* here. Might as well return failure right away.
*/
return (FALSE);
}
if (!get_input_bytes(rstrm, (caddr_t)&header, (int)sizeof (header),
rstrm->last_frag))
return (FALSE);
header = (uint32_t)xdr_ntoh32(header);
rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE;
rstrm->fbtbc = header & (~LAST_FRAG);
return (TRUE);
}
static bool /* must manage buffers, fragments, and records */
xdrrec_getbytes(XDR *xdrs, char *addr, u_int len)
{
RECSTREAM *rstrm = (RECSTREAM *) (xdrs->x_private);
int current;
while (len > 0) {
current = (int)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);
}
