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655 lines
18 KiB
C
655 lines
18 KiB
C
/*
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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) 2010, Oracle America, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the "Oracle America, Inc." nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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). The high 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 <string.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <rpc/rpc.h>
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#include <libintl.h>
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#include <wchar.h>
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#include <libio/iolibio.h>
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static bool_t xdrrec_getlong (XDR *, long *);
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static bool_t xdrrec_putlong (XDR *, const long *);
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static bool_t xdrrec_getbytes (XDR *, caddr_t, u_int);
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static bool_t xdrrec_putbytes (XDR *, const char *, u_int);
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static u_int xdrrec_getpos (const XDR *);
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static bool_t xdrrec_setpos (XDR *, u_int);
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static int32_t *xdrrec_inline (XDR *, u_int);
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static void xdrrec_destroy (XDR *);
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static bool_t xdrrec_getint32 (XDR *, int32_t *);
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static bool_t xdrrec_putint32 (XDR *, const int32_t *);
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static const 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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xdrrec_getint32,
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xdrrec_putint32
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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 (1UL << 31)
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typedef struct rec_strm
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{
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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-going bits
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*/
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int (*writeit) (char *, char *, int);
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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_int32_t *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) (char *, char *, int);
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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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}
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RECSTREAM;
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static u_int fix_buf_size (u_int) internal_function;
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static bool_t skip_input_bytes (RECSTREAM *, long) internal_function;
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static bool_t flush_out (RECSTREAM *, bool_t) internal_function;
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static bool_t set_input_fragment (RECSTREAM *) internal_function;
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static bool_t get_input_bytes (RECSTREAM *, caddr_t, int) internal_function;
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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 (XDR *xdrs, u_int sendsize,
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u_int recvsize, caddr_t tcp_handle,
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int (*readit) (char *, char *, int),
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int (*writeit) (char *, char *, int))
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{
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RECSTREAM *rstrm = (RECSTREAM *) mem_alloc (sizeof (RECSTREAM));
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caddr_t tmp;
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char *buf;
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sendsize = fix_buf_size (sendsize);
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recvsize = fix_buf_size (recvsize);
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buf = mem_alloc (sendsize + recvsize + BYTES_PER_XDR_UNIT);
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if (rstrm == NULL || buf == NULL)
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{
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(void) __fxprintf (NULL, "%s: %s", __func__, _("out of memory\n"));
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mem_free (rstrm, sizeof (RECSTREAM));
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mem_free (buf, sendsize + recvsize + BYTES_PER_XDR_UNIT);
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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;
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rstrm->recvsize = recvsize;
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rstrm->the_buffer = buf;
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tmp = rstrm->the_buffer;
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if ((size_t)tmp % BYTES_PER_XDR_UNIT)
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tmp += BYTES_PER_XDR_UNIT - (size_t)tmp % BYTES_PER_XDR_UNIT;
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rstrm->out_base = tmp;
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rstrm->in_base = tmp + sendsize;
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/*
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* now the rest ...
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*/
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/* We have to add the cast since the `struct xdr_ops' in `struct XDR'
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is not `const'. */
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xdrs->x_ops = (struct xdr_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_int32_t *) rstrm->out_base;
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rstrm->out_finger += 4;
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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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libc_hidden_nolink_sunrpc (xdrrec_create, GLIBC_2_0)
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/*
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* The routines 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 (XDR *xdrs, long *lp)
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{
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RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
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int32_t *buflp = (int32_t *) rstrm->in_finger;
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int32_t mylong;
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/* first try the inline, fast case */
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if (rstrm->fbtbc >= BYTES_PER_XDR_UNIT &&
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rstrm->in_boundry - (char *) buflp >= BYTES_PER_XDR_UNIT)
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{
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*lp = (int32_t) ntohl (*buflp);
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rstrm->fbtbc -= BYTES_PER_XDR_UNIT;
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rstrm->in_finger += BYTES_PER_XDR_UNIT;
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}
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else
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{
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if (!xdrrec_getbytes (xdrs, (caddr_t) & mylong,
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BYTES_PER_XDR_UNIT))
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return FALSE;
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*lp = (int32_t) ntohl (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 (XDR *xdrs, const long *lp)
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{
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RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
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int32_t *dest_lp = (int32_t *) rstrm->out_finger;
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if ((rstrm->out_finger += BYTES_PER_XDR_UNIT) > rstrm->out_boundry)
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{
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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 -= BYTES_PER_XDR_UNIT;
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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 = (int32_t *) rstrm->out_finger;
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rstrm->out_finger += BYTES_PER_XDR_UNIT;
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}
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*dest_lp = htonl (*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 (XDR *xdrs, caddr_t addr, u_int len)
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{
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RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
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u_int current;
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while (len > 0)
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{
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current = rstrm->fbtbc;
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if (current == 0)
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{
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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 (XDR *xdrs, const char *addr, u_int len)
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{
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RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
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u_int current;
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while (len > 0)
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{
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current = rstrm->out_boundry - rstrm->out_finger;
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current = (len < current) ? len : current;
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memcpy (rstrm->out_finger, addr, 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 && len > 0)
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{
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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 (const XDR *xdrs)
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{
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RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
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long pos;
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pos = __lseek ((int) (long) 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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{
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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 (XDR *xdrs, u_int pos)
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{
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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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{
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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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{
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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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{
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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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default:
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break;
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}
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return FALSE;
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}
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static int32_t *
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xdrrec_inline (XDR *xdrs, u_int len)
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{
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RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
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int32_t *buf = NULL;
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switch (xdrs->x_op)
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{
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case XDR_ENCODE:
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if ((rstrm->out_finger + len) <= rstrm->out_boundry)
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{
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buf = (int32_t *) 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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{
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buf = (int32_t *) 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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default:
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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 (XDR *xdrs)
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{
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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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static bool_t
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xdrrec_getint32 (XDR *xdrs, int32_t *ip)
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{
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RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
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int32_t *bufip = (int32_t *) rstrm->in_finger;
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int32_t mylong;
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/* first try the inline, fast case */
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if (rstrm->fbtbc >= BYTES_PER_XDR_UNIT &&
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rstrm->in_boundry - (char *) bufip >= BYTES_PER_XDR_UNIT)
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{
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*ip = ntohl (*bufip);
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rstrm->fbtbc -= BYTES_PER_XDR_UNIT;
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rstrm->in_finger += BYTES_PER_XDR_UNIT;
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}
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else
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{
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if (!xdrrec_getbytes (xdrs, (caddr_t) &mylong,
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BYTES_PER_XDR_UNIT))
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return FALSE;
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*ip = ntohl (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_putint32 (XDR *xdrs, const int32_t *ip)
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{
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RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
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int32_t *dest_ip = (int32_t *) rstrm->out_finger;
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if ((rstrm->out_finger += BYTES_PER_XDR_UNIT) > rstrm->out_boundry)
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{
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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 -= BYTES_PER_XDR_UNIT;
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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_ip = (int32_t *) rstrm->out_finger;
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rstrm->out_finger += BYTES_PER_XDR_UNIT;
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}
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*dest_ip = htonl (*ip);
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return TRUE;
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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 (XDR *xdrs)
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{
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RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
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while (rstrm->fbtbc > 0 || (!rstrm->last_frag))
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{
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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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libc_hidden_nolink_sunrpc (xdrrec_skiprecord, GLIBC_2_0)
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/*
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* Lookahead function.
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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 (XDR *xdrs)
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{
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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))
|
|
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;
|
|
}
|
|
libc_hidden_nolink_sunrpc (xdrrec_eof, GLIBC_2_0)
|
|
|
|
/*
|
|
* The client must tell the package when an end-of-record has occurred.
|
|
* The second parameter tells whether the record should be flushed to the
|
|
* (output) tcp stream. (This lets the package support batched or
|
|
* pipelined procedure calls.) TRUE => immediate flush to tcp connection.
|
|
*/
|
|
bool_t
|
|
xdrrec_endofrecord (XDR *xdrs, bool_t sendnow)
|
|
{
|
|
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;
|
|
}
|
|
libc_hidden_nolink_sunrpc (xdrrec_endofrecord, GLIBC_2_0)
|
|
|
|
|
|
/*
|
|
* Internal useful routines
|
|
*/
|
|
static bool_t
|
|
internal_function
|
|
flush_out (RECSTREAM *rstrm, bool_t eor)
|
|
{
|
|
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;
|
|
}
|
|
|
|
static bool_t /* knows nothing about records! Only about input buffers */
|
|
fill_input_buf (RECSTREAM *rstrm)
|
|
{
|
|
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;
|
|
}
|
|
|
|
static bool_t /* knows nothing about records! Only about input buffers */
|
|
internal_function
|
|
get_input_bytes (RECSTREAM *rstrm, caddr_t addr, int len)
|
|
{
|
|
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;
|
|
}
|
|
|
|
static bool_t /* next two bytes of the input stream are treated as a header */
|
|
internal_function
|
|
set_input_fragment (RECSTREAM *rstrm)
|
|
{
|
|
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;
|
|
}
|
|
|
|
static bool_t /* consumes input bytes; knows nothing about records! */
|
|
internal_function
|
|
skip_input_bytes (RECSTREAM *rstrm, long cnt)
|
|
{
|
|
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;
|
|
}
|
|
|
|
static u_int
|
|
internal_function
|
|
fix_buf_size (u_int s)
|
|
{
|
|
if (s < 100)
|
|
s = 4000;
|
|
return RNDUP (s);
|
|
}
|