1 /* $OpenBSD: xdr_stdio.c,v 1.15 2019/06/28 13:32:42 deraadt 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 /* 35 * xdr_stdio.c, XDR implementation on standard i/o file. 36 * 37 * This set of routines implements a XDR on a stdio stream. 38 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes 39 * from the stream. 40 */ 41 42 #include <stdio.h> 43 #include <rpc/types.h> 44 #include <rpc/xdr.h> 45 46 static bool_t xdrstdio_getlong(XDR *, long *); 47 static bool_t xdrstdio_putlong(XDR *, long *); 48 static bool_t xdrstdio_getbytes(XDR *, caddr_t, u_int); 49 static bool_t xdrstdio_putbytes(XDR *, caddr_t, u_int); 50 static u_int xdrstdio_getpos(XDR *); 51 static bool_t xdrstdio_setpos(XDR *, u_int); 52 static int32_t *xdrstdio_inline(XDR *, u_int); 53 static void xdrstdio_destroy(XDR *); 54 55 /* 56 * Ops vector for stdio type XDR 57 */ 58 static struct xdr_ops xdrstdio_ops = { 59 xdrstdio_getlong, /* deserialize a long int */ 60 xdrstdio_putlong, /* serialize a long int */ 61 xdrstdio_getbytes, /* deserialize counted bytes */ 62 xdrstdio_putbytes, /* serialize counted bytes */ 63 xdrstdio_getpos, /* get offset in the stream */ 64 xdrstdio_setpos, /* set offset in the stream */ 65 xdrstdio_inline, /* prime stream for inline macros */ 66 xdrstdio_destroy, /* destroy stream */ 67 NULL, /* xdrstdio_control */ 68 }; 69 70 /* 71 * Initialize a stdio xdr stream. 72 * Sets the xdr stream handle xdrs for use on the stream file. 73 * Operation flag is set to op. 74 */ 75 void 76 xdrstdio_create(XDR *xdrs, FILE *file, enum xdr_op op) 77 { 78 79 xdrs->x_op = op; 80 xdrs->x_ops = &xdrstdio_ops; 81 xdrs->x_private = (caddr_t)file; 82 xdrs->x_handy = 0; 83 xdrs->x_base = 0; 84 } 85 86 /* 87 * Destroy a stdio xdr stream. 88 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create. 89 */ 90 static void 91 xdrstdio_destroy(XDR *xdrs) 92 { 93 (void)fflush((FILE *)xdrs->x_private); 94 /* xx should we close the file ?? */ 95 } 96 97 static bool_t 98 xdrstdio_getlong(XDR *xdrs, long int *lp) 99 { 100 u_int32_t temp; 101 102 if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1) 103 return (FALSE); 104 *lp = (long)ntohl(temp); 105 return (TRUE); 106 } 107 108 static bool_t 109 xdrstdio_putlong(XDR *xdrs, long int *lp) 110 { 111 int32_t mycopy = htonl((u_int32_t)*lp); 112 113 if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1) 114 return (FALSE); 115 return (TRUE); 116 } 117 118 static bool_t 119 xdrstdio_getbytes(XDR *xdrs, caddr_t addr, u_int len) 120 { 121 122 if ((len != 0) && (fread(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1)) 123 return (FALSE); 124 return (TRUE); 125 } 126 127 static bool_t 128 xdrstdio_putbytes(XDR *xdrs, caddr_t addr, u_int len) 129 { 130 131 if ((len != 0) && (fwrite(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1)) 132 return (FALSE); 133 return (TRUE); 134 } 135 136 static u_int 137 xdrstdio_getpos(XDR *xdrs) 138 { 139 140 return ((u_int) ftell((FILE *)xdrs->x_private)); 141 } 142 143 static bool_t 144 xdrstdio_setpos(XDR *xdrs, u_int pos) 145 { 146 147 return ((fseek((FILE *)xdrs->x_private, (long)pos, SEEK_SET) == -1) ? 148 FALSE : TRUE); 149 } 150 151 static int32_t * 152 xdrstdio_inline(XDR *xdrs, u_int len) 153 { 154 155 /* 156 * Must do some work to implement this: must ensure 157 * enough data in the underlying stdio buffer, 158 * that the buffer is aligned so that we can indirect through a 159 * long *, and stuff this pointer in xdrs->x_buf. Doing 160 * a fread or fwrite to a scratch buffer would defeat 161 * most of the gains to be had here and require storage 162 * management on this buffer, so we don't do this. 163 */ 164 return (NULL); 165 } 166