1 /* $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 2010, Oracle America, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are 10 * met: 11 * 12 * * Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * * Redistributions in binary form must reproduce the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer in the documentation and/or other materials 17 * provided with the distribution. 18 * * Neither the name of the "Oracle America, Inc." nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 29 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 static char *sccsid2 = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro"; 38 static char *sccsid = "@(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC"; 39 #endif 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 /* 44 * xdr_mem.h, XDR implementation using memory buffers. 45 * 46 * If you have some data to be interpreted as external data representation 47 * or to be converted to external data representation in a memory buffer, 48 * then this is the package for you. 49 * 50 */ 51 52 #include "namespace.h" 53 #include <sys/types.h> 54 55 #include <netinet/in.h> 56 57 #include <string.h> 58 59 #include <rpc/types.h> 60 #include <rpc/xdr.h> 61 #include "un-namespace.h" 62 63 static void xdrmem_destroy(XDR *); 64 static bool_t xdrmem_getlong_aligned(XDR *, long *); 65 static bool_t xdrmem_putlong_aligned(XDR *, const long *); 66 static bool_t xdrmem_getlong_unaligned(XDR *, long *); 67 static bool_t xdrmem_putlong_unaligned(XDR *, const long *); 68 static bool_t xdrmem_getbytes(XDR *, char *, u_int); 69 static bool_t xdrmem_putbytes(XDR *, const char *, u_int); 70 /* XXX: w/64-bit pointers, u_int not enough! */ 71 static u_int xdrmem_getpos(XDR *); 72 static bool_t xdrmem_setpos(XDR *, u_int); 73 static int32_t *xdrmem_inline_aligned(XDR *, u_int); 74 static int32_t *xdrmem_inline_unaligned(XDR *, u_int); 75 76 static const struct xdr_ops xdrmem_ops_aligned = { 77 xdrmem_getlong_aligned, 78 xdrmem_putlong_aligned, 79 xdrmem_getbytes, 80 xdrmem_putbytes, 81 xdrmem_getpos, 82 xdrmem_setpos, 83 xdrmem_inline_aligned, 84 xdrmem_destroy 85 }; 86 87 static const struct xdr_ops xdrmem_ops_unaligned = { 88 xdrmem_getlong_unaligned, 89 xdrmem_putlong_unaligned, 90 xdrmem_getbytes, 91 xdrmem_putbytes, 92 xdrmem_getpos, 93 xdrmem_setpos, 94 xdrmem_inline_unaligned, 95 xdrmem_destroy 96 }; 97 98 /* 99 * The procedure xdrmem_create initializes a stream descriptor for a 100 * memory buffer. 101 */ 102 void 103 xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op) 104 { 105 106 xdrs->x_op = op; 107 xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1)) 108 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned; 109 xdrs->x_private = xdrs->x_base = addr; 110 xdrs->x_handy = size; 111 } 112 113 /*ARGSUSED*/ 114 static void 115 xdrmem_destroy(XDR *xdrs) 116 { 117 118 } 119 120 static bool_t 121 xdrmem_getlong_aligned(XDR *xdrs, long *lp) 122 { 123 124 if (xdrs->x_handy < sizeof(int32_t)) 125 return (FALSE); 126 xdrs->x_handy -= sizeof(int32_t); 127 *lp = ntohl(*(u_int32_t *)xdrs->x_private); 128 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 129 return (TRUE); 130 } 131 132 static bool_t 133 xdrmem_putlong_aligned(XDR *xdrs, const long *lp) 134 { 135 136 if (xdrs->x_handy < sizeof(int32_t)) 137 return (FALSE); 138 xdrs->x_handy -= sizeof(int32_t); 139 *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp); 140 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 141 return (TRUE); 142 } 143 144 static bool_t 145 xdrmem_getlong_unaligned(XDR *xdrs, long *lp) 146 { 147 u_int32_t l; 148 149 if (xdrs->x_handy < sizeof(int32_t)) 150 return (FALSE); 151 xdrs->x_handy -= sizeof(int32_t); 152 memmove(&l, xdrs->x_private, sizeof(int32_t)); 153 *lp = ntohl(l); 154 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 155 return (TRUE); 156 } 157 158 static bool_t 159 xdrmem_putlong_unaligned(XDR *xdrs, const long *lp) 160 { 161 u_int32_t l; 162 163 if (xdrs->x_handy < sizeof(int32_t)) 164 return (FALSE); 165 xdrs->x_handy -= sizeof(int32_t); 166 l = htonl((u_int32_t)*lp); 167 memmove(xdrs->x_private, &l, sizeof(int32_t)); 168 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 169 return (TRUE); 170 } 171 172 static bool_t 173 xdrmem_getbytes(XDR *xdrs, char *addr, u_int len) 174 { 175 176 if (xdrs->x_handy < len) 177 return (FALSE); 178 xdrs->x_handy -= len; 179 memmove(addr, xdrs->x_private, len); 180 xdrs->x_private = (char *)xdrs->x_private + len; 181 return (TRUE); 182 } 183 184 static bool_t 185 xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len) 186 { 187 188 if (xdrs->x_handy < len) 189 return (FALSE); 190 xdrs->x_handy -= len; 191 memmove(xdrs->x_private, addr, len); 192 xdrs->x_private = (char *)xdrs->x_private + len; 193 return (TRUE); 194 } 195 196 static u_int 197 xdrmem_getpos(XDR *xdrs) 198 { 199 200 /* XXX w/64-bit pointers, u_int not enough! */ 201 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base); 202 } 203 204 static bool_t 205 xdrmem_setpos(XDR *xdrs, u_int pos) 206 { 207 char *newaddr = xdrs->x_base + pos; 208 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy; 209 210 if (newaddr > lastaddr) 211 return (FALSE); 212 xdrs->x_private = newaddr; 213 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */ 214 return (TRUE); 215 } 216 217 static int32_t * 218 xdrmem_inline_aligned(XDR *xdrs, u_int len) 219 { 220 int32_t *buf = NULL; 221 222 if (xdrs->x_handy >= len) { 223 xdrs->x_handy -= len; 224 buf = (int32_t *)xdrs->x_private; 225 xdrs->x_private = (char *)xdrs->x_private + len; 226 } 227 return (buf); 228 } 229 230 /* ARGSUSED */ 231 static int32_t * 232 xdrmem_inline_unaligned(XDR *xdrs, u_int len) 233 { 234 235 return (0); 236 } 237