1 /* $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft 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 #if defined(LIBC_SCCS) && !defined(lint) 35 static char *sccsid2 = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro"; 36 static char *sccsid = "@(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC"; 37 #endif 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 /* 42 * xdr_mem.h, XDR implementation using memory buffers. 43 * 44 * If you have some data to be interpreted as external data representation 45 * or to be converted to external data representation in a memory buffer, 46 * then this is the package for you. 47 * 48 */ 49 50 #include "namespace.h" 51 #include <sys/types.h> 52 53 #include <netinet/in.h> 54 55 #include <string.h> 56 57 #include <rpc/types.h> 58 #include <rpc/xdr.h> 59 #include "un-namespace.h" 60 61 static void xdrmem_destroy(XDR *); 62 static bool_t xdrmem_getlong_aligned(XDR *, long *); 63 static bool_t xdrmem_putlong_aligned(XDR *, const long *); 64 static bool_t xdrmem_getlong_unaligned(XDR *, long *); 65 static bool_t xdrmem_putlong_unaligned(XDR *, const long *); 66 static bool_t xdrmem_getbytes(XDR *, char *, u_int); 67 static bool_t xdrmem_putbytes(XDR *, const char *, u_int); 68 /* XXX: w/64-bit pointers, u_int not enough! */ 69 static u_int xdrmem_getpos(XDR *); 70 static bool_t xdrmem_setpos(XDR *, u_int); 71 static int32_t *xdrmem_inline_aligned(XDR *, u_int); 72 static int32_t *xdrmem_inline_unaligned(XDR *, u_int); 73 74 static const struct xdr_ops xdrmem_ops_aligned = { 75 xdrmem_getlong_aligned, 76 xdrmem_putlong_aligned, 77 xdrmem_getbytes, 78 xdrmem_putbytes, 79 xdrmem_getpos, 80 xdrmem_setpos, 81 xdrmem_inline_aligned, 82 xdrmem_destroy 83 }; 84 85 static const struct xdr_ops xdrmem_ops_unaligned = { 86 xdrmem_getlong_unaligned, 87 xdrmem_putlong_unaligned, 88 xdrmem_getbytes, 89 xdrmem_putbytes, 90 xdrmem_getpos, 91 xdrmem_setpos, 92 xdrmem_inline_unaligned, 93 xdrmem_destroy 94 }; 95 96 /* 97 * The procedure xdrmem_create initializes a stream descriptor for a 98 * memory buffer. 99 */ 100 void 101 xdrmem_create(xdrs, addr, size, op) 102 XDR *xdrs; 103 char *addr; 104 u_int size; 105 enum xdr_op op; 106 { 107 108 xdrs->x_op = op; 109 xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1)) 110 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned; 111 xdrs->x_private = xdrs->x_base = addr; 112 xdrs->x_handy = size; 113 } 114 115 /*ARGSUSED*/ 116 static void 117 xdrmem_destroy(xdrs) 118 XDR *xdrs; 119 { 120 121 } 122 123 static bool_t 124 xdrmem_getlong_aligned(xdrs, lp) 125 XDR *xdrs; 126 long *lp; 127 { 128 129 if (xdrs->x_handy < sizeof(int32_t)) 130 return (FALSE); 131 xdrs->x_handy -= sizeof(int32_t); 132 *lp = ntohl(*(u_int32_t *)xdrs->x_private); 133 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 134 return (TRUE); 135 } 136 137 static bool_t 138 xdrmem_putlong_aligned(xdrs, lp) 139 XDR *xdrs; 140 const long *lp; 141 { 142 143 if (xdrs->x_handy < sizeof(int32_t)) 144 return (FALSE); 145 xdrs->x_handy -= sizeof(int32_t); 146 *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp); 147 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 148 return (TRUE); 149 } 150 151 static bool_t 152 xdrmem_getlong_unaligned(xdrs, lp) 153 XDR *xdrs; 154 long *lp; 155 { 156 u_int32_t l; 157 158 if (xdrs->x_handy < sizeof(int32_t)) 159 return (FALSE); 160 xdrs->x_handy -= sizeof(int32_t); 161 memmove(&l, xdrs->x_private, sizeof(int32_t)); 162 *lp = ntohl(l); 163 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 164 return (TRUE); 165 } 166 167 static bool_t 168 xdrmem_putlong_unaligned(xdrs, lp) 169 XDR *xdrs; 170 const long *lp; 171 { 172 u_int32_t l; 173 174 if (xdrs->x_handy < sizeof(int32_t)) 175 return (FALSE); 176 xdrs->x_handy -= sizeof(int32_t); 177 l = htonl((u_int32_t)*lp); 178 memmove(xdrs->x_private, &l, sizeof(int32_t)); 179 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 180 return (TRUE); 181 } 182 183 static bool_t 184 xdrmem_getbytes(xdrs, addr, len) 185 XDR *xdrs; 186 char *addr; 187 u_int len; 188 { 189 190 if (xdrs->x_handy < len) 191 return (FALSE); 192 xdrs->x_handy -= len; 193 memmove(addr, xdrs->x_private, len); 194 xdrs->x_private = (char *)xdrs->x_private + len; 195 return (TRUE); 196 } 197 198 static bool_t 199 xdrmem_putbytes(xdrs, addr, len) 200 XDR *xdrs; 201 const char *addr; 202 u_int len; 203 { 204 205 if (xdrs->x_handy < len) 206 return (FALSE); 207 xdrs->x_handy -= len; 208 memmove(xdrs->x_private, addr, len); 209 xdrs->x_private = (char *)xdrs->x_private + len; 210 return (TRUE); 211 } 212 213 static u_int 214 xdrmem_getpos(xdrs) 215 XDR *xdrs; 216 { 217 218 /* XXX w/64-bit pointers, u_int not enough! */ 219 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base); 220 } 221 222 static bool_t 223 xdrmem_setpos(xdrs, pos) 224 XDR *xdrs; 225 u_int pos; 226 { 227 char *newaddr = xdrs->x_base + pos; 228 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy; 229 230 if (newaddr > lastaddr) 231 return (FALSE); 232 xdrs->x_private = newaddr; 233 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */ 234 return (TRUE); 235 } 236 237 static int32_t * 238 xdrmem_inline_aligned(xdrs, len) 239 XDR *xdrs; 240 u_int len; 241 { 242 int32_t *buf = 0; 243 244 if (xdrs->x_handy >= len) { 245 xdrs->x_handy -= len; 246 buf = (int32_t *)xdrs->x_private; 247 xdrs->x_private = (char *)xdrs->x_private + len; 248 } 249 return (buf); 250 } 251 252 /* ARGSUSED */ 253 static int32_t * 254 xdrmem_inline_unaligned(xdrs, len) 255 XDR *xdrs; 256 u_int len; 257 { 258 259 return (0); 260 } 261