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-rw-r--r--lib/libc/rpc/xdr_rec.c587
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diff --git a/lib/libc/rpc/xdr_rec.c b/lib/libc/rpc/xdr_rec.c
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+/* $NetBSD: xdr_rec.c,v 1.5 1995/02/25 03:02:08 cgd Exp $ */
+
+/*
+ * 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 = "$NetBSD: xdr_rec.c,v 1.5 1995/02/25 03:02:08 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 int32_t *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_int32_t)(1 << 31))
+
+typedef struct rec_strm {
+ caddr_t tcp_handle;
+ caddr_t the_buffer;
+ /*
+ * out-goung bits
+ */
+ int (*writeit) __P((caddr_t, caddr_t, int));
+ 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_int32_t *frag_header; /* beginning of curren fragment */
+ bool_t frag_sent; /* true if buffer sent in middle of record */
+ /*
+ * in-coming bits
+ */
+ int (*readit) __P((caddr_t, caddr_t, int));
+ 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_long)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_int32_t *)rstrm->out_base;
+ rstrm->out_finger += sizeof(u_int32_t);
+ 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 int32_t *buflp = (int32_t *)(rstrm->in_finger);
+ int32_t mylong;
+
+ /* first try the inline, fast case */
+ if ((rstrm->fbtbc >= sizeof(int32_t)) &&
+ (((long)rstrm->in_boundry - (long)buflp) >= sizeof(int32_t))) {
+ *lp = (long)ntohl((u_int32_t)(*buflp));
+ rstrm->fbtbc -= sizeof(int32_t);
+ rstrm->in_finger += sizeof(int32_t);
+ } else {
+ if (! xdrrec_getbytes(xdrs, (caddr_t)&mylong, sizeof(int32_t)))
+ return (FALSE);
+ *lp = (long)ntohl((u_int32_t)mylong);
+ }
+ return (TRUE);
+}
+
+static bool_t
+xdrrec_putlong(xdrs, lp)
+ XDR *xdrs;
+ long *lp;
+{
+ register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
+ register int32_t *dest_lp = ((int32_t *)(rstrm->out_finger));
+
+ if ((rstrm->out_finger += sizeof(int32_t)) > rstrm->out_boundry) {
+ /*
+ * this case should almost never happen so the code is
+ * inefficient
+ */
+ rstrm->out_finger -= sizeof(int32_t);
+ rstrm->frag_sent = TRUE;
+ if (! flush_out(rstrm, FALSE))
+ return (FALSE);
+ dest_lp = ((int32_t *)(rstrm->out_finger));
+ rstrm->out_finger += sizeof(int32_t);
+ }
+ *dest_lp = (int32_t)htonl((u_int32_t)(*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 long current;
+
+ while (len > 0) {
+ current = (u_long)rstrm->out_boundry -
+ (u_long)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((off_t)(long)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 int32_t *
+xdrrec_inline(xdrs, len)
+ register XDR *xdrs;
+ int len;
+{
+ register 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;
+ }
+ 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_int32_t) >=
+ (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_int32_t);
+ *(rstrm->frag_header) = htonl((u_long)len | LAST_FRAG);
+ rstrm->frag_header = (u_int32_t *)rstrm->out_finger;
+ rstrm->out_finger += sizeof(u_int32_t);
+ 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_int32_t len = (u_long)(rstrm->out_finger) -
+ (u_long)(rstrm->frag_header) - sizeof(u_int32_t);
+
+ *(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_int32_t *)rstrm->out_base;
+ rstrm->out_finger = (caddr_t)rstrm->out_base + sizeof(u_int32_t);
+ 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_long i;
+ register long len;
+
+ where = rstrm->in_base;
+ i = (u_long)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 long current;
+
+ while (len > 0) {
+ current = (long)rstrm->in_boundry - (long)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_int32_t 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 long current;
+
+ while (cnt > 0) {
+ current = (long)rstrm->in_boundry - (long)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));
+}
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