1 /* $NetBSD: xdr_mem.c,v 1.19 2013/03/11 20:19:30 tron 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 #include <sys/cdefs.h> 35 #if defined(LIBC_SCCS) && !defined(lint) 36 #if 0 37 static char *sccsid = "@(#)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 #else 40 __RCSID("$NetBSD: xdr_mem.c,v 1.19 2013/03/11 20:19:30 tron Exp $"); 41 #endif 42 #endif 43 44 /* 45 * xdr_mem.h, XDR implementation using memory buffers. 46 * 47 * Copyright (C) 1984, Sun Microsystems, Inc. 48 * 49 * If you have some data to be interpreted as external data representation 50 * or to be converted to external data representation in a memory buffer, 51 * then this is the package for you. 52 * 53 */ 54 55 #include "namespace.h" 56 57 #include <sys/types.h> 58 59 #include <netinet/in.h> 60 61 #include <string.h> 62 63 #include <rpc/types.h> 64 #include <rpc/xdr.h> 65 66 #ifdef __weak_alias 67 __weak_alias(xdrmem_create,_xdrmem_create) 68 #endif 69 70 static void xdrmem_destroy(XDR *); 71 static bool_t xdrmem_getlong_aligned(XDR *, long *); 72 static bool_t xdrmem_putlong_aligned(XDR *, const long *); 73 static bool_t xdrmem_getlong_unaligned(XDR *, long *); 74 static bool_t xdrmem_putlong_unaligned(XDR *, const long *); 75 static bool_t xdrmem_getbytes(XDR *, char *, u_int); 76 static bool_t xdrmem_putbytes(XDR *, const char *, u_int); 77 /* XXX: w/64-bit pointers, u_int not enough! */ 78 static u_int xdrmem_getpos(XDR *); 79 static bool_t xdrmem_setpos(XDR *, u_int); 80 static int32_t *xdrmem_inline_aligned(XDR *, u_int); 81 static int32_t *xdrmem_inline_unaligned(XDR *, u_int); 82 83 static const struct xdr_ops xdrmem_ops_aligned = { 84 xdrmem_getlong_aligned, 85 xdrmem_putlong_aligned, 86 xdrmem_getbytes, 87 xdrmem_putbytes, 88 xdrmem_getpos, 89 xdrmem_setpos, 90 xdrmem_inline_aligned, 91 xdrmem_destroy, 92 NULL, /* xdrmem_control */ 93 }; 94 95 static const struct xdr_ops xdrmem_ops_unaligned = { 96 xdrmem_getlong_unaligned, 97 xdrmem_putlong_unaligned, 98 xdrmem_getbytes, 99 xdrmem_putbytes, 100 xdrmem_getpos, 101 xdrmem_setpos, 102 xdrmem_inline_unaligned, 103 xdrmem_destroy, 104 NULL, /* xdrmem_control */ 105 }; 106 107 /* 108 * The procedure xdrmem_create initializes a stream descriptor for a 109 * memory buffer. 110 */ 111 void 112 xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op) 113 { 114 115 xdrs->x_op = op; 116 xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1)) 117 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned; 118 xdrs->x_private = xdrs->x_base = addr; 119 xdrs->x_handy = size; 120 } 121 122 /*ARGSUSED*/ 123 static void 124 xdrmem_destroy(XDR *xdrs) 125 { 126 127 } 128 129 static bool_t 130 xdrmem_getlong_aligned(XDR *xdrs, long *lp) 131 { 132 133 if (xdrs->x_handy < sizeof(int32_t)) 134 return (FALSE); 135 xdrs->x_handy -= sizeof(int32_t); 136 *lp = ntohl(*(u_int32_t *)xdrs->x_private); 137 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 138 return (TRUE); 139 } 140 141 static bool_t 142 xdrmem_putlong_aligned(XDR *xdrs, const long *lp) 143 { 144 145 if (xdrs->x_handy < sizeof(int32_t)) 146 return (FALSE); 147 xdrs->x_handy -= sizeof(int32_t); 148 *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp); 149 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 150 return (TRUE); 151 } 152 153 static bool_t 154 xdrmem_getlong_unaligned(XDR *xdrs, 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(XDR *xdrs, const long *lp) 169 { 170 u_int32_t l; 171 172 if (xdrs->x_handy < sizeof(int32_t)) 173 return (FALSE); 174 xdrs->x_handy -= sizeof(int32_t); 175 l = htonl((u_int32_t)*lp); 176 memmove(xdrs->x_private, &l, sizeof(int32_t)); 177 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 178 return (TRUE); 179 } 180 181 static bool_t 182 xdrmem_getbytes(XDR *xdrs, char *addr, u_int len) 183 { 184 185 if (xdrs->x_handy < len) 186 return (FALSE); 187 xdrs->x_handy -= len; 188 memmove(addr, xdrs->x_private, len); 189 xdrs->x_private = (char *)xdrs->x_private + len; 190 return (TRUE); 191 } 192 193 static bool_t 194 xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len) 195 { 196 197 if (xdrs->x_handy < len) 198 return (FALSE); 199 xdrs->x_handy -= len; 200 memmove(xdrs->x_private, addr, len); 201 xdrs->x_private = (char *)xdrs->x_private + len; 202 return (TRUE); 203 } 204 205 static u_int 206 xdrmem_getpos(XDR *xdrs) 207 { 208 209 /* XXX w/64-bit pointers, u_int not enough! */ 210 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base); 211 } 212 213 static bool_t 214 xdrmem_setpos(XDR *xdrs, u_int pos) 215 { 216 char *newaddr = xdrs->x_base + pos; 217 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy; 218 219 if ((long)newaddr > (long)lastaddr) 220 return (FALSE); 221 xdrs->x_private = newaddr; 222 xdrs->x_handy = (int)((long)lastaddr - (long)newaddr); 223 return (TRUE); 224 } 225 226 static int32_t * 227 xdrmem_inline_aligned(XDR *xdrs, u_int len) 228 { 229 int32_t *buf = 0; 230 231 if (xdrs->x_handy >= len) { 232 xdrs->x_handy -= len; 233 buf = (int32_t *)xdrs->x_private; 234 xdrs->x_private = (char *)xdrs->x_private + len; 235 } 236 return (buf); 237 } 238 239 /* ARGSUSED */ 240 static int32_t * 241 xdrmem_inline_unaligned(XDR *xdrs, u_int len) 242 { 243 244 return (0); 245 } 246