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 /* 37 * xdr_mem.h, XDR implementation using memory buffers. 38 * 39 * If you have some data to be interpreted as external data representation 40 * or to be converted to external data representation in a memory buffer, 41 * then this is the package for you. 42 * 43 */ 44 45 #include "namespace.h" 46 #include <sys/types.h> 47 48 #include <netinet/in.h> 49 50 #include <string.h> 51 52 #include <rpc/types.h> 53 #include <rpc/xdr.h> 54 #include "un-namespace.h" 55 56 static void xdrmem_destroy(XDR *); 57 static bool_t xdrmem_getlong_aligned(XDR *, long *); 58 static bool_t xdrmem_putlong_aligned(XDR *, const long *); 59 static bool_t xdrmem_getlong_unaligned(XDR *, long *); 60 static bool_t xdrmem_putlong_unaligned(XDR *, const long *); 61 static bool_t xdrmem_getbytes(XDR *, char *, u_int); 62 static bool_t xdrmem_putbytes(XDR *, const char *, u_int); 63 /* XXX: w/64-bit pointers, u_int not enough! */ 64 static u_int xdrmem_getpos(XDR *); 65 static bool_t xdrmem_setpos(XDR *, u_int); 66 static int32_t *xdrmem_inline_aligned(XDR *, u_int); 67 static int32_t *xdrmem_inline_unaligned(XDR *, u_int); 68 69 static const struct xdr_ops xdrmem_ops_aligned = { 70 xdrmem_getlong_aligned, 71 xdrmem_putlong_aligned, 72 xdrmem_getbytes, 73 xdrmem_putbytes, 74 xdrmem_getpos, 75 xdrmem_setpos, 76 xdrmem_inline_aligned, 77 xdrmem_destroy 78 }; 79 80 static const struct xdr_ops xdrmem_ops_unaligned = { 81 xdrmem_getlong_unaligned, 82 xdrmem_putlong_unaligned, 83 xdrmem_getbytes, 84 xdrmem_putbytes, 85 xdrmem_getpos, 86 xdrmem_setpos, 87 xdrmem_inline_unaligned, 88 xdrmem_destroy 89 }; 90 91 /* 92 * The procedure xdrmem_create initializes a stream descriptor for a 93 * memory buffer. 94 */ 95 void 96 xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op) 97 { 98 99 xdrs->x_op = op; 100 xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1)) 101 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned; 102 xdrs->x_private = xdrs->x_base = addr; 103 xdrs->x_handy = size; 104 } 105 106 /*ARGSUSED*/ 107 static void 108 xdrmem_destroy(XDR *xdrs) 109 { 110 111 } 112 113 static bool_t 114 xdrmem_getlong_aligned(XDR *xdrs, long *lp) 115 { 116 117 if (xdrs->x_handy < sizeof(int32_t)) 118 return (FALSE); 119 xdrs->x_handy -= sizeof(int32_t); 120 *lp = ntohl(*(u_int32_t *)xdrs->x_private); 121 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 122 return (TRUE); 123 } 124 125 static bool_t 126 xdrmem_putlong_aligned(XDR *xdrs, const long *lp) 127 { 128 129 if (xdrs->x_handy < sizeof(int32_t)) 130 return (FALSE); 131 xdrs->x_handy -= sizeof(int32_t); 132 *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp); 133 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 134 return (TRUE); 135 } 136 137 static bool_t 138 xdrmem_getlong_unaligned(XDR *xdrs, long *lp) 139 { 140 u_int32_t l; 141 142 if (xdrs->x_handy < sizeof(int32_t)) 143 return (FALSE); 144 xdrs->x_handy -= sizeof(int32_t); 145 memmove(&l, xdrs->x_private, sizeof(int32_t)); 146 *lp = ntohl(l); 147 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 148 return (TRUE); 149 } 150 151 static bool_t 152 xdrmem_putlong_unaligned(XDR *xdrs, const long *lp) 153 { 154 u_int32_t l; 155 156 if (xdrs->x_handy < sizeof(int32_t)) 157 return (FALSE); 158 xdrs->x_handy -= sizeof(int32_t); 159 l = htonl((u_int32_t)*lp); 160 memmove(xdrs->x_private, &l, sizeof(int32_t)); 161 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 162 return (TRUE); 163 } 164 165 static bool_t 166 xdrmem_getbytes(XDR *xdrs, char *addr, u_int len) 167 { 168 169 if (xdrs->x_handy < len) 170 return (FALSE); 171 xdrs->x_handy -= len; 172 memmove(addr, xdrs->x_private, len); 173 xdrs->x_private = (char *)xdrs->x_private + len; 174 return (TRUE); 175 } 176 177 static bool_t 178 xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len) 179 { 180 181 if (xdrs->x_handy < len) 182 return (FALSE); 183 xdrs->x_handy -= len; 184 memmove(xdrs->x_private, addr, len); 185 xdrs->x_private = (char *)xdrs->x_private + len; 186 return (TRUE); 187 } 188 189 static u_int 190 xdrmem_getpos(XDR *xdrs) 191 { 192 193 /* XXX w/64-bit pointers, u_int not enough! */ 194 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base); 195 } 196 197 static bool_t 198 xdrmem_setpos(XDR *xdrs, u_int pos) 199 { 200 char *newaddr = xdrs->x_base + pos; 201 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy; 202 203 if (newaddr > lastaddr) 204 return (FALSE); 205 xdrs->x_private = newaddr; 206 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */ 207 return (TRUE); 208 } 209 210 static int32_t * 211 xdrmem_inline_aligned(XDR *xdrs, u_int len) 212 { 213 int32_t *buf = NULL; 214 215 if (xdrs->x_handy >= len) { 216 xdrs->x_handy -= len; 217 buf = (int32_t *)xdrs->x_private; 218 xdrs->x_private = (char *)xdrs->x_private + len; 219 } 220 return (buf); 221 } 222 223 /* ARGSUSED */ 224 static int32_t * 225 xdrmem_inline_unaligned(XDR *xdrs, u_int len) 226 { 227 228 return (0); 229 } 230