4851695cf7
recently in BUGTRAQ. The set_input_fragment() routine in the XDR record marking code blindly trusts that the first two bytes it sees will in fact be an actual record header and that the specified size will be sane. In fact, if you just telnet to a listening port of an RPC service and send a few carriage returns, set_input_fragment() will obtain a ridiculously large record size and sit there for a long time trying to read from the network. A sanity test is required: if the record size is larger than the receive buffer, punt.
593 lines
16 KiB
C
593 lines
16 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 1.8 1997/05/28 04:57:38 wpaul 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 <string.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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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 int32_t *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_int32_t)(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) __P((caddr_t, caddr_t, 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 current 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) __P((caddr_t, caddr_t, 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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} 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_long)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_int32_t *)rstrm->out_base;
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rstrm->out_finger += sizeof(u_int32_t);
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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 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 >= sizeof(int32_t)) &&
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(((long)rstrm->in_boundry - (long)buflp) >= sizeof(int32_t))) {
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*lp = (long)ntohl((u_int32_t)(*buflp));
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rstrm->fbtbc -= sizeof(int32_t);
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rstrm->in_finger += sizeof(int32_t);
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} else {
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if (! xdrrec_getbytes(xdrs, (caddr_t)&mylong, sizeof(int32_t)))
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return (FALSE);
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*lp = (long)ntohl((u_int32_t)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 int32_t *dest_lp = ((int32_t *)(rstrm->out_finger));
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if ((rstrm->out_finger += sizeof(int32_t)) > 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(int32_t);
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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 += sizeof(int32_t);
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}
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*dest_lp = (int32_t)htonl((u_int32_t)(*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 long current;
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while (len > 0) {
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current = (u_long)rstrm->out_boundry -
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(u_long)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) {
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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)(long)rstrm->tcp_handle, (off_t) 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 = -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 int32_t *
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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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int32_t * 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 = (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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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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}
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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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/*
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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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/*
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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_int32_t) >=
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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_int32_t);
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*(rstrm->frag_header) = htonl((u_long)len | LAST_FRAG);
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rstrm->frag_header = (u_int32_t *)rstrm->out_finger;
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rstrm->out_finger += sizeof(u_int32_t);
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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_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;
|
|
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 */
|
|
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;
|
|
/*
|
|
* Sanity check. Try not to accept wildly incorrect
|
|
* record sizes.
|
|
*/
|
|
if ((header & (~LAST_FRAG)) > rstrm->recvsize)
|
|
return(FALSE);
|
|
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));
|
|
}
|