585 lines
15 KiB
C
585 lines
15 KiB
C
/*
|
|
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
|
|
* unrestricted use provided that this legend is included on all tape
|
|
* media and as a part of the software program in whole or part. Users
|
|
* may copy or modify Sun RPC without charge, but are not authorized
|
|
* to license or distribute it to anyone else except as part of a product or
|
|
* program developed by the user.
|
|
*
|
|
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
|
|
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
|
|
*
|
|
* Sun RPC is provided with no support and without any obligation on the
|
|
* part of Sun Microsystems, Inc. to assist in its use, correction,
|
|
* modification or enhancement.
|
|
*
|
|
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
|
|
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
|
|
* OR ANY PART THEREOF.
|
|
*
|
|
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
|
|
* or profits or other special, indirect and consequential damages, even if
|
|
* Sun has been advised of the possibility of such damages.
|
|
*
|
|
* Sun Microsystems, Inc.
|
|
* 2550 Garcia Avenue
|
|
* Mountain View, California 94043
|
|
*/
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
/*static char *sccsid = "from: @(#)xdr_rec.c 1.21 87/08/11 Copyr 1984 Sun Micro";*/
|
|
/*static char *sccsid = "from: @(#)xdr_rec.c 2.2 88/08/01 4.0 RPCSRC";*/
|
|
static char *rcsid = "$Id: xdr_rec.c,v 1.3 1994/04/01 03:53:29 cgd Exp $";
|
|
#endif
|
|
|
|
/*
|
|
* xdr_rec.c, Implements TCP/IP based XDR streams with a "record marking"
|
|
* layer above tcp (for rpc's use).
|
|
*
|
|
* Copyright (C) 1984, Sun Microsystems, Inc.
|
|
*
|
|
* These routines interface XDRSTREAMS to a tcp/ip connection.
|
|
* There is a record marking layer between the xdr stream
|
|
* and the tcp transport level. A record is composed on one or more
|
|
* record fragments. A record fragment is a thirty-two bit header followed
|
|
* by n bytes of data, where n is contained in the header. The header
|
|
* is represented as a htonl(u_long). Thegh order bit encodes
|
|
* whether or not the fragment is the last fragment of the record
|
|
* (1 => fragment is last, 0 => more fragments to follow.
|
|
* The other 31 bits encode the byte length of the fragment.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <rpc/types.h>
|
|
#include <rpc/xdr.h>
|
|
#include <netinet/in.h>
|
|
|
|
static u_int fix_buf_size();
|
|
static bool_t flush_out();
|
|
static bool_t get_input_bytes();
|
|
static bool_t set_input_fragment();
|
|
static bool_t skip_input_bytes();
|
|
|
|
static bool_t xdrrec_getlong();
|
|
static bool_t xdrrec_putlong();
|
|
static bool_t xdrrec_getbytes();
|
|
static bool_t xdrrec_putbytes();
|
|
static u_int xdrrec_getpos();
|
|
static bool_t xdrrec_setpos();
|
|
static long * xdrrec_inline();
|
|
static void xdrrec_destroy();
|
|
|
|
static struct xdr_ops xdrrec_ops = {
|
|
xdrrec_getlong,
|
|
xdrrec_putlong,
|
|
xdrrec_getbytes,
|
|
xdrrec_putbytes,
|
|
xdrrec_getpos,
|
|
xdrrec_setpos,
|
|
xdrrec_inline,
|
|
xdrrec_destroy
|
|
};
|
|
|
|
/*
|
|
* A record is composed of one or more record fragments.
|
|
* A record fragment is a two-byte header followed by zero to
|
|
* 2**32-1 bytes. The header is treated as a long unsigned and is
|
|
* encode/decoded to the network via htonl/ntohl. The low order 31 bits
|
|
* are a byte count of the fragment. The highest order bit is a boolean:
|
|
* 1 => this fragment is the last fragment of the record,
|
|
* 0 => this fragment is followed by more fragment(s).
|
|
*
|
|
* The fragment/record machinery is not general; it is constructed to
|
|
* meet the needs of xdr and rpc based on tcp.
|
|
*/
|
|
|
|
#define LAST_FRAG ((u_long)(1 << 31))
|
|
|
|
typedef struct rec_strm {
|
|
caddr_t tcp_handle;
|
|
caddr_t the_buffer;
|
|
/*
|
|
* out-goung bits
|
|
*/
|
|
int (*writeit)();
|
|
caddr_t out_base; /* output buffer (points to frag header) */
|
|
caddr_t out_finger; /* next output position */
|
|
caddr_t out_boundry; /* data cannot up to this address */
|
|
u_long *frag_header; /* beginning of curren fragment */
|
|
bool_t frag_sent; /* true if buffer sent in middle of record */
|
|
/*
|
|
* in-coming bits
|
|
*/
|
|
int (*readit)();
|
|
u_long in_size; /* fixed size of the input buffer */
|
|
caddr_t in_base;
|
|
caddr_t in_finger; /* location of next byte to be had */
|
|
caddr_t in_boundry; /* can read up to this location */
|
|
long fbtbc; /* fragment bytes to be consumed */
|
|
bool_t last_frag;
|
|
u_int sendsize;
|
|
u_int recvsize;
|
|
} RECSTREAM;
|
|
|
|
|
|
/*
|
|
* Create an xdr handle for xdrrec
|
|
* xdrrec_create fills in xdrs. Sendsize and recvsize are
|
|
* send and recv buffer sizes (0 => use default).
|
|
* tcp_handle is an opaque handle that is passed as the first parameter to
|
|
* the procedures readit and writeit. Readit and writeit are read and
|
|
* write respectively. They are like the system
|
|
* calls expect that they take an opaque handle rather than an fd.
|
|
*/
|
|
void
|
|
xdrrec_create(xdrs, sendsize, recvsize, tcp_handle, readit, writeit)
|
|
register XDR *xdrs;
|
|
register u_int sendsize;
|
|
register u_int recvsize;
|
|
caddr_t tcp_handle;
|
|
int (*readit)(); /* like read, but pass it a tcp_handle, not sock */
|
|
int (*writeit)(); /* like write, but pass it a tcp_handle, not sock */
|
|
{
|
|
register RECSTREAM *rstrm =
|
|
(RECSTREAM *)mem_alloc(sizeof(RECSTREAM));
|
|
|
|
if (rstrm == NULL) {
|
|
(void)fprintf(stderr, "xdrrec_create: out of memory\n");
|
|
/*
|
|
* 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 = fix_buf_size(sendsize);
|
|
rstrm->recvsize = recvsize = fix_buf_size(recvsize);
|
|
rstrm->the_buffer = mem_alloc(sendsize + recvsize + BYTES_PER_XDR_UNIT);
|
|
if (rstrm->the_buffer == NULL) {
|
|
(void)fprintf(stderr, "xdrrec_create: out of memory\n");
|
|
return;
|
|
}
|
|
for (rstrm->out_base = rstrm->the_buffer;
|
|
(u_int)rstrm->out_base % BYTES_PER_XDR_UNIT != 0;
|
|
rstrm->out_base++);
|
|
rstrm->in_base = rstrm->out_base + sendsize;
|
|
/*
|
|
* now the rest ...
|
|
*/
|
|
xdrs->x_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_long *)rstrm->out_base;
|
|
rstrm->out_finger += sizeof(u_long);
|
|
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;
|
|
}
|
|
|
|
|
|
/*
|
|
* The reoutines defined below are the xdr ops which will go into the
|
|
* xdr handle filled in by xdrrec_create.
|
|
*/
|
|
|
|
static bool_t
|
|
xdrrec_getlong(xdrs, lp)
|
|
XDR *xdrs;
|
|
long *lp;
|
|
{
|
|
register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
|
|
register long *buflp = (long *)(rstrm->in_finger);
|
|
long mylong;
|
|
|
|
/* first try the inline, fast case */
|
|
if ((rstrm->fbtbc >= sizeof(long)) &&
|
|
(((int)rstrm->in_boundry - (int)buflp) >= sizeof(long))) {
|
|
*lp = (long)ntohl((u_long)(*buflp));
|
|
rstrm->fbtbc -= sizeof(long);
|
|
rstrm->in_finger += sizeof(long);
|
|
} else {
|
|
if (! xdrrec_getbytes(xdrs, (caddr_t)&mylong, sizeof(long)))
|
|
return (FALSE);
|
|
*lp = (long)ntohl((u_long)mylong);
|
|
}
|
|
return (TRUE);
|
|
}
|
|
|
|
static bool_t
|
|
xdrrec_putlong(xdrs, lp)
|
|
XDR *xdrs;
|
|
long *lp;
|
|
{
|
|
register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
|
|
register long *dest_lp = ((long *)(rstrm->out_finger));
|
|
|
|
if ((rstrm->out_finger += sizeof(long)) > rstrm->out_boundry) {
|
|
/*
|
|
* this case should almost never happen so the code is
|
|
* inefficient
|
|
*/
|
|
rstrm->out_finger -= sizeof(long);
|
|
rstrm->frag_sent = TRUE;
|
|
if (! flush_out(rstrm, FALSE))
|
|
return (FALSE);
|
|
dest_lp = ((long *)(rstrm->out_finger));
|
|
rstrm->out_finger += sizeof(long);
|
|
}
|
|
*dest_lp = (long)htonl((u_long)(*lp));
|
|
return (TRUE);
|
|
}
|
|
|
|
static bool_t /* must manage buffers, fragments, and records */
|
|
xdrrec_getbytes(xdrs, addr, len)
|
|
XDR *xdrs;
|
|
register caddr_t addr;
|
|
register u_int len;
|
|
{
|
|
register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
|
|
register 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
|
|
xdrrec_putbytes(xdrs, addr, len)
|
|
XDR *xdrs;
|
|
register caddr_t addr;
|
|
register u_int len;
|
|
{
|
|
register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
|
|
register int current;
|
|
|
|
while (len > 0) {
|
|
current = (u_int)rstrm->out_boundry - (u_int)rstrm->out_finger;
|
|
current = (len < current) ? len : current;
|
|
bcopy(addr, rstrm->out_finger, current);
|
|
rstrm->out_finger += current;
|
|
addr += current;
|
|
len -= current;
|
|
if (rstrm->out_finger == rstrm->out_boundry) {
|
|
rstrm->frag_sent = TRUE;
|
|
if (! flush_out(rstrm, FALSE))
|
|
return (FALSE);
|
|
}
|
|
}
|
|
return (TRUE);
|
|
}
|
|
|
|
static u_int
|
|
xdrrec_getpos(xdrs)
|
|
register XDR *xdrs;
|
|
{
|
|
register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
|
|
register long pos;
|
|
|
|
pos = lseek((int)rstrm->tcp_handle, 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);
|
|
}
|
|
|
|
static bool_t
|
|
xdrrec_setpos(xdrs, pos)
|
|
register XDR *xdrs;
|
|
u_int pos;
|
|
{
|
|
register 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;
|
|
}
|
|
return (FALSE);
|
|
}
|
|
|
|
static long *
|
|
xdrrec_inline(xdrs, len)
|
|
register XDR *xdrs;
|
|
int len;
|
|
{
|
|
register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
|
|
long * buf = NULL;
|
|
|
|
switch (xdrs->x_op) {
|
|
|
|
case XDR_ENCODE:
|
|
if ((rstrm->out_finger + len) <= rstrm->out_boundry) {
|
|
buf = (long *) rstrm->out_finger;
|
|
rstrm->out_finger += len;
|
|
}
|
|
break;
|
|
|
|
case XDR_DECODE:
|
|
if ((len <= rstrm->fbtbc) &&
|
|
((rstrm->in_finger + len) <= rstrm->in_boundry)) {
|
|
buf = (long *) rstrm->in_finger;
|
|
rstrm->fbtbc -= len;
|
|
rstrm->in_finger += len;
|
|
}
|
|
break;
|
|
}
|
|
return (buf);
|
|
}
|
|
|
|
static void
|
|
xdrrec_destroy(xdrs)
|
|
register XDR *xdrs;
|
|
{
|
|
register 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));
|
|
}
|
|
|
|
|
|
/*
|
|
* Exported routines to manage xdr records
|
|
*/
|
|
|
|
/*
|
|
* Before reading (deserializing from the stream, one should always call
|
|
* this procedure to guarantee proper record alignment.
|
|
*/
|
|
bool_t
|
|
xdrrec_skiprecord(xdrs)
|
|
XDR *xdrs;
|
|
{
|
|
register 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);
|
|
}
|
|
|
|
/*
|
|
* Look ahead fuction.
|
|
* Returns TRUE iff there is no more input in the buffer
|
|
* after consuming the rest of the current record.
|
|
*/
|
|
bool_t
|
|
xdrrec_eof(xdrs)
|
|
XDR *xdrs;
|
|
{
|
|
register 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);
|
|
}
|
|
|
|
/*
|
|
* The client must tell the package when an end-of-record has occurred.
|
|
* The second paraemters tells whether the record should be flushed to the
|
|
* (output) tcp stream. (This let's the package support batched or
|
|
* pipelined procedure calls.) TRUE => immmediate flush to tcp connection.
|
|
*/
|
|
bool_t
|
|
xdrrec_endofrecord(xdrs, sendnow)
|
|
XDR *xdrs;
|
|
bool_t sendnow;
|
|
{
|
|
register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
|
|
register u_long len; /* fragment length */
|
|
|
|
if (sendnow || rstrm->frag_sent ||
|
|
((u_long)rstrm->out_finger + sizeof(u_long) >=
|
|
(u_long)rstrm->out_boundry)) {
|
|
rstrm->frag_sent = FALSE;
|
|
return (flush_out(rstrm, TRUE));
|
|
}
|
|
len = (u_long)(rstrm->out_finger) - (u_long)(rstrm->frag_header) -
|
|
sizeof(u_long);
|
|
*(rstrm->frag_header) = htonl((u_long)len | LAST_FRAG);
|
|
rstrm->frag_header = (u_long *)rstrm->out_finger;
|
|
rstrm->out_finger += sizeof(u_long);
|
|
return (TRUE);
|
|
}
|
|
|
|
|
|
/*
|
|
* Internal useful routines
|
|
*/
|
|
static bool_t
|
|
flush_out(rstrm, eor)
|
|
register RECSTREAM *rstrm;
|
|
bool_t eor;
|
|
{
|
|
register u_long eormask = (eor == TRUE) ? LAST_FRAG : 0;
|
|
register u_long len = (u_long)(rstrm->out_finger) -
|
|
(u_long)(rstrm->frag_header) - sizeof(u_long);
|
|
|
|
*(rstrm->frag_header) = htonl(len | eormask);
|
|
len = (u_long)(rstrm->out_finger) - (u_long)(rstrm->out_base);
|
|
if ((*(rstrm->writeit))(rstrm->tcp_handle, rstrm->out_base, (int)len)
|
|
!= (int)len)
|
|
return (FALSE);
|
|
rstrm->frag_header = (u_long *)rstrm->out_base;
|
|
rstrm->out_finger = (caddr_t)rstrm->out_base + sizeof(u_long);
|
|
return (TRUE);
|
|
}
|
|
|
|
static bool_t /* knows nothing about records! Only about input buffers */
|
|
fill_input_buf(rstrm)
|
|
register RECSTREAM *rstrm;
|
|
{
|
|
register caddr_t where;
|
|
u_int i;
|
|
register int len;
|
|
|
|
where = rstrm->in_base;
|
|
i = (u_int)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);
|
|
}
|
|
|
|
static bool_t /* knows nothing about records! Only about input buffers */
|
|
get_input_bytes(rstrm, addr, len)
|
|
register RECSTREAM *rstrm;
|
|
register caddr_t addr;
|
|
register int len;
|
|
{
|
|
register int current;
|
|
|
|
while (len > 0) {
|
|
current = (int)rstrm->in_boundry - (int)rstrm->in_finger;
|
|
if (current == 0) {
|
|
if (! fill_input_buf(rstrm))
|
|
return (FALSE);
|
|
continue;
|
|
}
|
|
current = (len < current) ? len : current;
|
|
bcopy(rstrm->in_finger, addr, current);
|
|
rstrm->in_finger += current;
|
|
addr += current;
|
|
len -= current;
|
|
}
|
|
return (TRUE);
|
|
}
|
|
|
|
static bool_t /* next two bytes of the input stream are treated as a header */
|
|
set_input_fragment(rstrm)
|
|
register RECSTREAM *rstrm;
|
|
{
|
|
u_long header;
|
|
|
|
if (! get_input_bytes(rstrm, (caddr_t)&header, sizeof(header)))
|
|
return (FALSE);
|
|
header = (long)ntohl(header);
|
|
rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE;
|
|
rstrm->fbtbc = header & (~LAST_FRAG);
|
|
return (TRUE);
|
|
}
|
|
|
|
static bool_t /* consumes input bytes; knows nothing about records! */
|
|
skip_input_bytes(rstrm, cnt)
|
|
register RECSTREAM *rstrm;
|
|
long cnt;
|
|
{
|
|
register int current;
|
|
|
|
while (cnt > 0) {
|
|
current = (int)rstrm->in_boundry - (int)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);
|
|
}
|
|
|
|
static u_int
|
|
fix_buf_size(s)
|
|
register u_int s;
|
|
{
|
|
|
|
if (s < 100)
|
|
s = 4000;
|
|
return (RNDUP(s));
|
|
}
|