1 /* $NetBSD: xdr_stdio.c,v 1.14 2000/01/22 22:19:19 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_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro"; 38 static char *sccsid = "@(#)xdr_stdio.c 2.1 88/07/29 4.0 RPCSRC"; 39 #endif 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 /* 44 * xdr_stdio.c, XDR implementation on standard i/o file. 45 * 46 * This set of routines implements a XDR on a stdio stream. 47 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes 48 * from the stream. 49 */ 50 51 #include "namespace.h" 52 #include <stdio.h> 53 54 #include <arpa/inet.h> 55 #include <rpc/types.h> 56 #include <rpc/xdr.h> 57 #include "un-namespace.h" 58 59 static void xdrstdio_destroy(XDR *); 60 static bool_t xdrstdio_getlong(XDR *, long *); 61 static bool_t xdrstdio_putlong(XDR *, const long *); 62 static bool_t xdrstdio_getbytes(XDR *, char *, u_int); 63 static bool_t xdrstdio_putbytes(XDR *, const char *, u_int); 64 static u_int xdrstdio_getpos(XDR *); 65 static bool_t xdrstdio_setpos(XDR *, u_int); 66 static int32_t *xdrstdio_inline(XDR *, u_int); 67 68 /* 69 * Ops vector for stdio type XDR 70 */ 71 static const struct xdr_ops xdrstdio_ops = { 72 xdrstdio_getlong, /* deseraialize a long int */ 73 xdrstdio_putlong, /* seraialize a long int */ 74 xdrstdio_getbytes, /* deserialize counted bytes */ 75 xdrstdio_putbytes, /* serialize counted bytes */ 76 xdrstdio_getpos, /* get offset in the stream */ 77 xdrstdio_setpos, /* set offset in the stream */ 78 xdrstdio_inline, /* prime stream for inline macros */ 79 xdrstdio_destroy /* destroy stream */ 80 }; 81 82 /* 83 * Initialize a stdio xdr stream. 84 * Sets the xdr stream handle xdrs for use on the stream file. 85 * Operation flag is set to op. 86 */ 87 void 88 xdrstdio_create(XDR *xdrs, FILE *file, enum xdr_op op) 89 { 90 91 xdrs->x_op = op; 92 xdrs->x_ops = &xdrstdio_ops; 93 xdrs->x_private = file; 94 xdrs->x_handy = 0; 95 xdrs->x_base = 0; 96 } 97 98 /* 99 * Destroy a stdio xdr stream. 100 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create. 101 */ 102 static void 103 xdrstdio_destroy(XDR *xdrs) 104 { 105 (void)fflush((FILE *)xdrs->x_private); 106 /* XXX: should we close the file ?? */ 107 } 108 109 static bool_t 110 xdrstdio_getlong(XDR *xdrs, long *lp) 111 { 112 u_int32_t temp; 113 114 if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1) 115 return (FALSE); 116 *lp = (long)ntohl(temp); 117 return (TRUE); 118 } 119 120 static bool_t 121 xdrstdio_putlong(XDR *xdrs, const long *lp) 122 { 123 int32_t mycopy = htonl((u_int32_t)*lp); 124 125 if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1) 126 return (FALSE); 127 return (TRUE); 128 } 129 130 static bool_t 131 xdrstdio_getbytes(XDR *xdrs, char *addr, u_int len) 132 { 133 134 if ((len != 0) && (fread(addr, (size_t)len, 1, (FILE *)xdrs->x_private) != 1)) 135 return (FALSE); 136 return (TRUE); 137 } 138 139 static bool_t 140 xdrstdio_putbytes(XDR *xdrs, const char *addr, u_int len) 141 { 142 143 if ((len != 0) && (fwrite(addr, (size_t)len, 1, 144 (FILE *)xdrs->x_private) != 1)) 145 return (FALSE); 146 return (TRUE); 147 } 148 149 static u_int 150 xdrstdio_getpos(XDR *xdrs) 151 { 152 153 return ((u_int) ftell((FILE *)xdrs->x_private)); 154 } 155 156 static bool_t 157 xdrstdio_setpos(XDR *xdrs, u_int pos) 158 { 159 160 return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ? 161 FALSE : TRUE); 162 } 163 164 /* ARGSUSED */ 165 static int32_t * 166 xdrstdio_inline(XDR *xdrs, u_int len) 167 { 168 169 /* 170 * Must do some work to implement this: must insure 171 * enough data in the underlying stdio buffer, 172 * that the buffer is aligned so that we can indirect through a 173 * long *, and stuff this pointer in xdrs->x_buf. Doing 174 * a fread or fwrite to a scratch buffer would defeat 175 * most of the gains to be had here and require storage 176 * management on this buffer, so we don't do this. 177 */ 178 return (NULL); 179 } 180