1/* $OpenBSD: xdr_mem.c,v 1.18 2022/02/14 03:38:59 guenther Exp $ */ 2 3/* 4 * Copyright (c) 2010, Oracle America, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * * Redistributions in binary form must reproduce the above 13 * copyright notice, this list of conditions and the following 14 * disclaimer in the documentation and/or other materials 15 * provided with the distribution. 16 * * Neither the name of the "Oracle America, Inc." nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34/* 35 * xdr_mem.h, XDR implementation using memory buffers. 36 * 37 * If you have some data to be interpreted as external data representation 38 * or to be converted to external data representation in a memory buffer, 39 * then this is the package for you. 40 * 41 */ 42 43#include <sys/types.h> 44#include <netinet/in.h> 45#include <string.h> 46 47#include <rpc/types.h> 48#include <rpc/xdr.h> 49 50static bool_t xdrmem_getlong_aligned(XDR *, long *); 51static bool_t xdrmem_putlong_aligned(XDR *, long *); 52static bool_t xdrmem_getlong_unaligned(XDR *, long *); 53static bool_t xdrmem_putlong_unaligned(XDR *, long *); 54static bool_t xdrmem_getbytes(XDR *, caddr_t, u_int); 55static bool_t xdrmem_putbytes(XDR *, caddr_t, u_int); 56static u_int xdrmem_getpos(XDR *); /* XXX w/64-bit pointers, u_int not enough! */ 57static bool_t xdrmem_setpos(XDR *, u_int); 58static int32_t *xdrmem_inline_aligned(XDR *, u_int); 59static int32_t *xdrmem_inline_unaligned(XDR *, u_int); 60static void xdrmem_destroy(XDR *); 61 62static const struct xdr_ops xdrmem_ops_aligned = { 63 xdrmem_getlong_aligned, 64 xdrmem_putlong_aligned, 65 xdrmem_getbytes, 66 xdrmem_putbytes, 67 xdrmem_getpos, 68 xdrmem_setpos, 69 xdrmem_inline_aligned, 70 xdrmem_destroy, 71 NULL, /* xdrmem_control */ 72}; 73 74static const struct xdr_ops xdrmem_ops_unaligned = { 75 xdrmem_getlong_unaligned, 76 xdrmem_putlong_unaligned, 77 xdrmem_getbytes, 78 xdrmem_putbytes, 79 xdrmem_getpos, 80 xdrmem_setpos, 81 xdrmem_inline_unaligned, 82 xdrmem_destroy, 83 NULL, /* xdrmem_control */ 84}; 85 86/* 87 * The procedure xdrmem_create initializes a stream descriptor for a 88 * memory buffer. 89 */ 90void 91xdrmem_create(XDR *xdrs, caddr_t addr, u_int size, enum xdr_op op) 92{ 93 94 xdrs->x_op = op; 95 xdrs->x_ops = ((size_t)addr & (sizeof(int32_t) - 1)) 96 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned; 97 xdrs->x_private = xdrs->x_base = addr; 98 xdrs->x_handy = size; 99} 100DEF_WEAK(xdrmem_create); 101 102static void 103xdrmem_destroy(XDR *xdrs) 104{ 105} 106 107static bool_t 108xdrmem_getlong_aligned(XDR *xdrs, long int *lp) 109{ 110 111 if (xdrs->x_handy < sizeof(int32_t)) 112 return (FALSE); 113 xdrs->x_handy -= sizeof(int32_t); 114 *lp = ntohl(*(int32_t *)xdrs->x_private); 115 xdrs->x_private += sizeof(int32_t); 116 return (TRUE); 117} 118 119static bool_t 120xdrmem_putlong_aligned(XDR *xdrs, long int *lp) 121{ 122 123 if (xdrs->x_handy < sizeof(int32_t)) 124 return (FALSE); 125 xdrs->x_handy -= sizeof(int32_t); 126 *(int32_t *)xdrs->x_private = htonl((u_int32_t)*lp); 127 xdrs->x_private += sizeof(int32_t); 128 return (TRUE); 129} 130 131static bool_t 132xdrmem_getlong_unaligned(XDR *xdrs, long int *lp) 133{ 134 int32_t l; 135 136 if (xdrs->x_handy < sizeof(int32_t)) 137 return (FALSE); 138 xdrs->x_handy -= sizeof(int32_t); 139 memcpy(&l, xdrs->x_private, sizeof(int32_t)); 140 *lp = ntohl(l); 141 xdrs->x_private += sizeof(int32_t); 142 return (TRUE); 143} 144 145static bool_t 146xdrmem_putlong_unaligned(XDR *xdrs, long int *lp) 147{ 148 int32_t l; 149 150 if (xdrs->x_handy < sizeof(int32_t)) 151 return (FALSE); 152 xdrs->x_handy -= sizeof(int32_t); 153 l = htonl((u_int32_t)*lp); 154 memcpy(xdrs->x_private, &l, sizeof(int32_t)); 155 xdrs->x_private += sizeof(int32_t); 156 return (TRUE); 157} 158 159static bool_t 160xdrmem_getbytes(XDR *xdrs, caddr_t addr, u_int len) 161{ 162 163 if (xdrs->x_handy < len) 164 return (FALSE); 165 xdrs->x_handy -= len; 166 memcpy(addr, xdrs->x_private, len); 167 xdrs->x_private += len; 168 return (TRUE); 169} 170 171static bool_t 172xdrmem_putbytes(XDR *xdrs, caddr_t addr, u_int len) 173{ 174 175 if (xdrs->x_handy < len) 176 return (FALSE); 177 xdrs->x_handy -= len; 178 memcpy(xdrs->x_private, addr, len); 179 xdrs->x_private += len; 180 return (TRUE); 181} 182 183static u_int 184xdrmem_getpos(XDR *xdrs) 185{ 186 187 /* XXX w/64-bit pointers, u_int not enough! */ 188 return ((u_long)xdrs->x_private - (u_long)xdrs->x_base); 189} 190 191static bool_t 192xdrmem_setpos(XDR *xdrs, u_int pos) 193{ 194 caddr_t newaddr = xdrs->x_base + pos; 195 caddr_t lastaddr = xdrs->x_private + xdrs->x_handy; 196 197 if (newaddr > lastaddr) 198 return (FALSE); 199 xdrs->x_private = newaddr; 200 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX w/64-bit pointers, u_int not enough! */ 201 return (TRUE); 202} 203 204static int32_t * 205xdrmem_inline_aligned(XDR *xdrs, u_int len) 206{ 207 int32_t *buf = 0; 208 209 if (xdrs->x_handy >= len) { 210 xdrs->x_handy -= len; 211 buf = (int32_t *)xdrs->x_private; 212 xdrs->x_private += len; 213 } 214 return (buf); 215} 216 217static int32_t * 218xdrmem_inline_unaligned(XDR *xdrs, u_int len) 219{ 220 221 return (0); 222} 223