1 /* $OpenBSD: xdr_mem.c,v 1.18 2022/02/14 03:38:59 guenther 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_mem.h, XDR implementation using memory buffers.
36 *
37 * If you have some data to be interpreted as external data representation
38 * or to be converted to external data representation in a memory buffer,
39 * then this is the package for you.
40 *
41 */
42
43 #include <sys/types.h>
44 #include <netinet/in.h>
45 #include <string.h>
46
47 #include <rpc/types.h>
48 #include <rpc/xdr.h>
49
50 static bool_t xdrmem_getlong_aligned(XDR *, long *);
51 static bool_t xdrmem_putlong_aligned(XDR *, long *);
52 static bool_t xdrmem_getlong_unaligned(XDR *, long *);
53 static bool_t xdrmem_putlong_unaligned(XDR *, long *);
54 static bool_t xdrmem_getbytes(XDR *, caddr_t, u_int);
55 static bool_t xdrmem_putbytes(XDR *, caddr_t, u_int);
56 static u_int xdrmem_getpos(XDR *); /* XXX w/64-bit pointers, u_int not enough! */
57 static bool_t xdrmem_setpos(XDR *, u_int);
58 static int32_t *xdrmem_inline_aligned(XDR *, u_int);
59 static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
60 static void xdrmem_destroy(XDR *);
61
62 static const struct xdr_ops xdrmem_ops_aligned = {
63 xdrmem_getlong_aligned,
64 xdrmem_putlong_aligned,
65 xdrmem_getbytes,
66 xdrmem_putbytes,
67 xdrmem_getpos,
68 xdrmem_setpos,
69 xdrmem_inline_aligned,
70 xdrmem_destroy,
71 NULL, /* xdrmem_control */
72 };
73
74 static const struct xdr_ops xdrmem_ops_unaligned = {
75 xdrmem_getlong_unaligned,
76 xdrmem_putlong_unaligned,
77 xdrmem_getbytes,
78 xdrmem_putbytes,
79 xdrmem_getpos,
80 xdrmem_setpos,
81 xdrmem_inline_unaligned,
82 xdrmem_destroy,
83 NULL, /* xdrmem_control */
84 };
85
86 /*
87 * The procedure xdrmem_create initializes a stream descriptor for a
88 * memory buffer.
89 */
90 void
xdrmem_create(XDR * xdrs,caddr_t addr,u_int size,enum xdr_op op)91 xdrmem_create(XDR *xdrs, caddr_t addr, u_int size, enum xdr_op op)
92 {
93
94 xdrs->x_op = op;
95 xdrs->x_ops = ((size_t)addr & (sizeof(int32_t) - 1))
96 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
97 xdrs->x_private = xdrs->x_base = addr;
98 xdrs->x_handy = size;
99 }
100 DEF_WEAK(xdrmem_create);
101
102 static void
xdrmem_destroy(XDR * xdrs)103 xdrmem_destroy(XDR *xdrs)
104 {
105 }
106
107 static bool_t
xdrmem_getlong_aligned(XDR * xdrs,long int * lp)108 xdrmem_getlong_aligned(XDR *xdrs, long int *lp)
109 {
110
111 if (xdrs->x_handy < sizeof(int32_t))
112 return (FALSE);
113 xdrs->x_handy -= sizeof(int32_t);
114 *lp = ntohl(*(int32_t *)xdrs->x_private);
115 xdrs->x_private += sizeof(int32_t);
116 return (TRUE);
117 }
118
119 static bool_t
xdrmem_putlong_aligned(XDR * xdrs,long int * lp)120 xdrmem_putlong_aligned(XDR *xdrs, long int *lp)
121 {
122
123 if (xdrs->x_handy < sizeof(int32_t))
124 return (FALSE);
125 xdrs->x_handy -= sizeof(int32_t);
126 *(int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
127 xdrs->x_private += sizeof(int32_t);
128 return (TRUE);
129 }
130
131 static bool_t
xdrmem_getlong_unaligned(XDR * xdrs,long int * lp)132 xdrmem_getlong_unaligned(XDR *xdrs, long int *lp)
133 {
134 int32_t l;
135
136 if (xdrs->x_handy < sizeof(int32_t))
137 return (FALSE);
138 xdrs->x_handy -= sizeof(int32_t);
139 memcpy(&l, xdrs->x_private, sizeof(int32_t));
140 *lp = ntohl(l);
141 xdrs->x_private += sizeof(int32_t);
142 return (TRUE);
143 }
144
145 static bool_t
xdrmem_putlong_unaligned(XDR * xdrs,long int * lp)146 xdrmem_putlong_unaligned(XDR *xdrs, long int *lp)
147 {
148 int32_t l;
149
150 if (xdrs->x_handy < sizeof(int32_t))
151 return (FALSE);
152 xdrs->x_handy -= sizeof(int32_t);
153 l = htonl((u_int32_t)*lp);
154 memcpy(xdrs->x_private, &l, sizeof(int32_t));
155 xdrs->x_private += sizeof(int32_t);
156 return (TRUE);
157 }
158
159 static bool_t
xdrmem_getbytes(XDR * xdrs,caddr_t addr,u_int len)160 xdrmem_getbytes(XDR *xdrs, caddr_t addr, u_int len)
161 {
162
163 if (xdrs->x_handy < len)
164 return (FALSE);
165 xdrs->x_handy -= len;
166 memcpy(addr, xdrs->x_private, len);
167 xdrs->x_private += len;
168 return (TRUE);
169 }
170
171 static bool_t
xdrmem_putbytes(XDR * xdrs,caddr_t addr,u_int len)172 xdrmem_putbytes(XDR *xdrs, caddr_t addr, u_int len)
173 {
174
175 if (xdrs->x_handy < len)
176 return (FALSE);
177 xdrs->x_handy -= len;
178 memcpy(xdrs->x_private, addr, len);
179 xdrs->x_private += len;
180 return (TRUE);
181 }
182
183 static u_int
xdrmem_getpos(XDR * xdrs)184 xdrmem_getpos(XDR *xdrs)
185 {
186
187 /* XXX w/64-bit pointers, u_int not enough! */
188 return ((u_long)xdrs->x_private - (u_long)xdrs->x_base);
189 }
190
191 static bool_t
xdrmem_setpos(XDR * xdrs,u_int pos)192 xdrmem_setpos(XDR *xdrs, u_int pos)
193 {
194 caddr_t newaddr = xdrs->x_base + pos;
195 caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
196
197 if (newaddr > lastaddr)
198 return (FALSE);
199 xdrs->x_private = newaddr;
200 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX w/64-bit pointers, u_int not enough! */
201 return (TRUE);
202 }
203
204 static int32_t *
xdrmem_inline_aligned(XDR * xdrs,u_int len)205 xdrmem_inline_aligned(XDR *xdrs, u_int len)
206 {
207 int32_t *buf = 0;
208
209 if (xdrs->x_handy >= len) {
210 xdrs->x_handy -= len;
211 buf = (int32_t *)xdrs->x_private;
212 xdrs->x_private += len;
213 }
214 return (buf);
215 }
216
217 static int32_t *
xdrmem_inline_unaligned(XDR * xdrs,u_int len)218 xdrmem_inline_unaligned(XDR *xdrs, u_int len)
219 {
220
221 return (0);
222 }
223