587 lines
15 KiB
C
587 lines
15 KiB
C
/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)xdr_rec.c 1.21 87/08/11 Copyr 1984 Sun Micro";*/
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/*static char *sccsid = "from: @(#)xdr_rec.c 2.2 88/08/01 4.0 RPCSRC";*/
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static char *rcsid = "$Id: xdr_rec.c,v 1.4 1993/08/26 00:53:51 jtc Exp $";
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#endif
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/*
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* xdr_rec.c, Implements TCP/IP based XDR streams with a "record marking"
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* layer above tcp (for rpc's use).
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*
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* These routines interface XDRSTREAMS to a tcp/ip connection.
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* There is a record marking layer between the xdr stream
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* and the tcp transport level. A record is composed on one or more
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* record fragments. A record fragment is a thirty-two bit header followed
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* by n bytes of data, where n is contained in the header. The header
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* is represented as a htonl(u_long). Thegh order bit encodes
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* whether or not the fragment is the last fragment of the record
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* (1 => fragment is last, 0 => more fragments to follow.
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* The other 31 bits encode the byte length of the fragment.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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#include <netinet/in.h>
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extern long lseek();
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static u_int fix_buf_size();
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static bool_t flush_out();
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static bool_t get_input_bytes();
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static bool_t set_input_fragment();
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static bool_t skip_input_bytes();
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static bool_t xdrrec_getlong();
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static bool_t xdrrec_putlong();
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static bool_t xdrrec_getbytes();
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static bool_t xdrrec_putbytes();
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static u_int xdrrec_getpos();
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static bool_t xdrrec_setpos();
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static long * xdrrec_inline();
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static void xdrrec_destroy();
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static struct xdr_ops xdrrec_ops = {
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xdrrec_getlong,
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xdrrec_putlong,
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xdrrec_getbytes,
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xdrrec_putbytes,
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xdrrec_getpos,
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xdrrec_setpos,
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xdrrec_inline,
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xdrrec_destroy
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};
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/*
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* A record is composed of one or more record fragments.
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* A record fragment is a two-byte header followed by zero to
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* 2**32-1 bytes. The header is treated as a long unsigned and is
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* encode/decoded to the network via htonl/ntohl. The low order 31 bits
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* are a byte count of the fragment. The highest order bit is a boolean:
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* 1 => this fragment is the last fragment of the record,
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* 0 => this fragment is followed by more fragment(s).
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*
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* The fragment/record machinery is not general; it is constructed to
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* meet the needs of xdr and rpc based on tcp.
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*/
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#define LAST_FRAG ((u_long)(1 << 31))
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typedef struct rec_strm {
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caddr_t tcp_handle;
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caddr_t the_buffer;
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/*
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* out-goung bits
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*/
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int (*writeit)();
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caddr_t out_base; /* output buffer (points to frag header) */
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caddr_t out_finger; /* next output position */
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caddr_t out_boundry; /* data cannot up to this address */
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u_long *frag_header; /* beginning of curren fragment */
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bool_t frag_sent; /* true if buffer sent in middle of record */
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/*
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* in-coming bits
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*/
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int (*readit)();
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u_long in_size; /* fixed size of the input buffer */
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caddr_t in_base;
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caddr_t in_finger; /* location of next byte to be had */
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caddr_t in_boundry; /* can read up to this location */
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long fbtbc; /* fragment bytes to be consumed */
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bool_t last_frag;
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u_int sendsize;
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u_int recvsize;
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} RECSTREAM;
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/*
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* Create an xdr handle for xdrrec
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* xdrrec_create fills in xdrs. Sendsize and recvsize are
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* send and recv buffer sizes (0 => use default).
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* tcp_handle is an opaque handle that is passed as the first parameter to
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* the procedures readit and writeit. Readit and writeit are read and
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* write respectively. They are like the system
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* calls expect that they take an opaque handle rather than an fd.
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*/
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void
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xdrrec_create(xdrs, sendsize, recvsize, tcp_handle, readit, writeit)
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register XDR *xdrs;
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register u_int sendsize;
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register u_int recvsize;
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caddr_t tcp_handle;
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int (*readit)(); /* like read, but pass it a tcp_handle, not sock */
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int (*writeit)(); /* like write, but pass it a tcp_handle, not sock */
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{
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register RECSTREAM *rstrm =
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(RECSTREAM *)mem_alloc(sizeof(RECSTREAM));
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if (rstrm == NULL) {
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(void)fprintf(stderr, "xdrrec_create: out of memory\n");
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/*
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* This is bad. Should rework xdrrec_create to
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* return a handle, and in this case return NULL
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*/
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return;
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}
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/*
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* adjust sizes and allocate buffer quad byte aligned
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*/
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rstrm->sendsize = sendsize = fix_buf_size(sendsize);
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rstrm->recvsize = recvsize = fix_buf_size(recvsize);
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rstrm->the_buffer = mem_alloc(sendsize + recvsize + BYTES_PER_XDR_UNIT);
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if (rstrm->the_buffer == NULL) {
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(void)fprintf(stderr, "xdrrec_create: out of memory\n");
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return;
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}
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for (rstrm->out_base = rstrm->the_buffer;
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(u_int)rstrm->out_base % BYTES_PER_XDR_UNIT != 0;
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rstrm->out_base++);
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rstrm->in_base = rstrm->out_base + sendsize;
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/*
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* now the rest ...
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*/
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xdrs->x_ops = &xdrrec_ops;
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xdrs->x_private = (caddr_t)rstrm;
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rstrm->tcp_handle = tcp_handle;
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rstrm->readit = readit;
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rstrm->writeit = writeit;
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rstrm->out_finger = rstrm->out_boundry = rstrm->out_base;
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rstrm->frag_header = (u_long *)rstrm->out_base;
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rstrm->out_finger += sizeof(u_long);
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rstrm->out_boundry += sendsize;
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rstrm->frag_sent = FALSE;
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rstrm->in_size = recvsize;
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rstrm->in_boundry = rstrm->in_base;
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rstrm->in_finger = (rstrm->in_boundry += recvsize);
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rstrm->fbtbc = 0;
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rstrm->last_frag = TRUE;
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}
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/*
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* The reoutines defined below are the xdr ops which will go into the
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* xdr handle filled in by xdrrec_create.
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*/
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static bool_t
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xdrrec_getlong(xdrs, lp)
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XDR *xdrs;
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long *lp;
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{
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register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
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register long *buflp = (long *)(rstrm->in_finger);
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long mylong;
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/* first try the inline, fast case */
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if ((rstrm->fbtbc >= sizeof(long)) &&
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(((int)rstrm->in_boundry - (int)buflp) >= sizeof(long))) {
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*lp = (long)ntohl((u_long)(*buflp));
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rstrm->fbtbc -= sizeof(long);
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rstrm->in_finger += sizeof(long);
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} else {
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if (! xdrrec_getbytes(xdrs, (caddr_t)&mylong, sizeof(long)))
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return (FALSE);
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*lp = (long)ntohl((u_long)mylong);
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}
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return (TRUE);
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}
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static bool_t
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xdrrec_putlong(xdrs, lp)
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XDR *xdrs;
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long *lp;
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{
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register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
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register long *dest_lp = ((long *)(rstrm->out_finger));
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if ((rstrm->out_finger += sizeof(long)) > rstrm->out_boundry) {
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/*
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* this case should almost never happen so the code is
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* inefficient
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*/
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rstrm->out_finger -= sizeof(long);
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rstrm->frag_sent = TRUE;
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if (! flush_out(rstrm, FALSE))
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return (FALSE);
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dest_lp = ((long *)(rstrm->out_finger));
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rstrm->out_finger += sizeof(long);
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}
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*dest_lp = (long)htonl((u_long)(*lp));
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return (TRUE);
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}
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static bool_t /* must manage buffers, fragments, and records */
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xdrrec_getbytes(xdrs, addr, len)
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XDR *xdrs;
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register caddr_t addr;
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register u_int len;
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{
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register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
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register int current;
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while (len > 0) {
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current = rstrm->fbtbc;
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if (current == 0) {
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if (rstrm->last_frag)
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return (FALSE);
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if (! set_input_fragment(rstrm))
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return (FALSE);
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continue;
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}
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current = (len < current) ? len : current;
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if (! get_input_bytes(rstrm, addr, current))
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return (FALSE);
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addr += current;
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rstrm->fbtbc -= current;
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len -= current;
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}
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return (TRUE);
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}
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static bool_t
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xdrrec_putbytes(xdrs, addr, len)
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XDR *xdrs;
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register caddr_t addr;
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register u_int len;
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{
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register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
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register int current;
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while (len > 0) {
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current = (u_int)rstrm->out_boundry - (u_int)rstrm->out_finger;
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current = (len < current) ? len : current;
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bcopy(addr, rstrm->out_finger, current);
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rstrm->out_finger += current;
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addr += current;
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len -= current;
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if (rstrm->out_finger == rstrm->out_boundry) {
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rstrm->frag_sent = TRUE;
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if (! flush_out(rstrm, FALSE))
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return (FALSE);
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}
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}
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return (TRUE);
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}
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static u_int
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xdrrec_getpos(xdrs)
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register XDR *xdrs;
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{
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register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
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register long pos;
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pos = lseek((int)rstrm->tcp_handle, (long) 0, 1);
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if (pos != -1)
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switch (xdrs->x_op) {
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case XDR_ENCODE:
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pos += rstrm->out_finger - rstrm->out_base;
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break;
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case XDR_DECODE:
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pos -= rstrm->in_boundry - rstrm->in_finger;
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break;
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default:
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pos = (u_int) -1;
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break;
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}
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return ((u_int) pos);
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}
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static bool_t
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xdrrec_setpos(xdrs, pos)
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register XDR *xdrs;
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u_int pos;
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{
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register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
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u_int currpos = xdrrec_getpos(xdrs);
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int delta = currpos - pos;
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caddr_t newpos;
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if ((int)currpos != -1)
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switch (xdrs->x_op) {
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case XDR_ENCODE:
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newpos = rstrm->out_finger - delta;
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if ((newpos > (caddr_t)(rstrm->frag_header)) &&
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(newpos < rstrm->out_boundry)) {
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rstrm->out_finger = newpos;
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return (TRUE);
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}
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break;
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case XDR_DECODE:
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newpos = rstrm->in_finger - delta;
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if ((delta < (int)(rstrm->fbtbc)) &&
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(newpos <= rstrm->in_boundry) &&
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(newpos >= rstrm->in_base)) {
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rstrm->in_finger = newpos;
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rstrm->fbtbc -= delta;
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return (TRUE);
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}
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break;
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}
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return (FALSE);
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}
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static long *
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xdrrec_inline(xdrs, len)
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register XDR *xdrs;
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int len;
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{
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register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
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long * buf = NULL;
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switch (xdrs->x_op) {
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case XDR_ENCODE:
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if ((rstrm->out_finger + len) <= rstrm->out_boundry) {
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buf = (long *) rstrm->out_finger;
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rstrm->out_finger += len;
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}
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break;
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case XDR_DECODE:
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if ((len <= rstrm->fbtbc) &&
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((rstrm->in_finger + len) <= rstrm->in_boundry)) {
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buf = (long *) rstrm->in_finger;
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rstrm->fbtbc -= len;
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rstrm->in_finger += len;
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}
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break;
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}
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return (buf);
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}
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static void
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xdrrec_destroy(xdrs)
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register XDR *xdrs;
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{
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register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
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mem_free(rstrm->the_buffer,
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rstrm->sendsize + rstrm->recvsize + BYTES_PER_XDR_UNIT);
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mem_free((caddr_t)rstrm, sizeof(RECSTREAM));
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}
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/*
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* Exported routines to manage xdr records
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*/
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/*
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* Before reading (deserializing from the stream, one should always call
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* this procedure to guarantee proper record alignment.
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*/
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bool_t
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xdrrec_skiprecord(xdrs)
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XDR *xdrs;
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{
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register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
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while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) {
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if (! skip_input_bytes(rstrm, rstrm->fbtbc))
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return (FALSE);
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rstrm->fbtbc = 0;
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if ((! rstrm->last_frag) && (! set_input_fragment(rstrm)))
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return (FALSE);
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}
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rstrm->last_frag = FALSE;
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return (TRUE);
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}
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/*
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* Look ahead fuction.
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* Returns TRUE iff there is no more input in the buffer
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* after consuming the rest of the current record.
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*/
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bool_t
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xdrrec_eof(xdrs)
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XDR *xdrs;
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{
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register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
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while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) {
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if (! skip_input_bytes(rstrm, rstrm->fbtbc))
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return (TRUE);
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rstrm->fbtbc = 0;
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if ((! rstrm->last_frag) && (! set_input_fragment(rstrm)))
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return (TRUE);
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}
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if (rstrm->in_finger == rstrm->in_boundry)
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return (TRUE);
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return (FALSE);
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}
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/*
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* The client must tell the package when an end-of-record has occurred.
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* The second paraemters tells whether the record should be flushed to the
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* (output) tcp stream. (This let's the package support batched or
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* pipelined procedure calls.) TRUE => immmediate flush to tcp connection.
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*/
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bool_t
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xdrrec_endofrecord(xdrs, sendnow)
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XDR *xdrs;
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bool_t sendnow;
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{
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register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
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register u_long len; /* fragment length */
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if (sendnow || rstrm->frag_sent ||
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((u_long)rstrm->out_finger + sizeof(u_long) >=
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(u_long)rstrm->out_boundry)) {
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rstrm->frag_sent = FALSE;
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return (flush_out(rstrm, TRUE));
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}
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len = (u_long)(rstrm->out_finger) - (u_long)(rstrm->frag_header) -
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sizeof(u_long);
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*(rstrm->frag_header) = htonl((u_long)len | LAST_FRAG);
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rstrm->frag_header = (u_long *)rstrm->out_finger;
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rstrm->out_finger += sizeof(u_long);
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return (TRUE);
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}
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/*
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* Internal useful routines
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*/
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static bool_t
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flush_out(rstrm, eor)
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register RECSTREAM *rstrm;
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bool_t eor;
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{
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register u_long eormask = (eor == TRUE) ? LAST_FRAG : 0;
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register u_long len = (u_long)(rstrm->out_finger) -
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(u_long)(rstrm->frag_header) - sizeof(u_long);
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*(rstrm->frag_header) = htonl(len | eormask);
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len = (u_long)(rstrm->out_finger) - (u_long)(rstrm->out_base);
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if ((*(rstrm->writeit))(rstrm->tcp_handle, rstrm->out_base, (int)len)
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!= (int)len)
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return (FALSE);
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rstrm->frag_header = (u_long *)rstrm->out_base;
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rstrm->out_finger = (caddr_t)rstrm->out_base + sizeof(u_long);
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return (TRUE);
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}
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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));
|
|
}
|