1 /* @(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC */
2 /*
3 * Copyright (c) 2010, Oracle America, Inc.
4 *
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * * Neither the name of the "Oracle America, Inc." nor the names of
19 * its contributors may be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
23 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
25 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
28 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34 #if !defined(lint) && defined(SCCSIDS)
35 static char sccsid[] = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
36 #endif
37
38 /*
39 * xdr_mem.h, XDR implementation using memory buffers.
40 *
41 * If you have some data to be interpreted as external data representation
42 * or to be converted to external data representation in a memory buffer,
43 * then this is the package for you.
44 *
45 */
46
47
48 #include <gssrpc/types.h>
49 #include <gssrpc/xdr.h>
50 #include <netinet/in.h>
51 #include <stdio.h>
52 #include <string.h>
53 #include <limits.h>
54
55 static bool_t xdrmem_getlong(XDR *, long *);
56 static bool_t xdrmem_putlong(XDR *, long *);
57 static bool_t xdrmem_getbytes(XDR *, caddr_t, u_int);
58 static bool_t xdrmem_putbytes(XDR *, caddr_t, u_int);
59 static u_int xdrmem_getpos(XDR *);
60 static bool_t xdrmem_setpos(XDR *, u_int);
61 static rpc_inline_t * xdrmem_inline(XDR *, int);
62 static void xdrmem_destroy(XDR *);
63
64 static struct xdr_ops xdrmem_ops = {
65 xdrmem_getlong,
66 xdrmem_putlong,
67 xdrmem_getbytes,
68 xdrmem_putbytes,
69 xdrmem_getpos,
70 xdrmem_setpos,
71 xdrmem_inline,
72 xdrmem_destroy
73 };
74
75 /*
76 * The procedure xdrmem_create initializes a stream descriptor for a
77 * memory buffer.
78 */
79 void
xdrmem_create(XDR * xdrs,caddr_t addr,u_int size,enum xdr_op op)80 xdrmem_create(
81 XDR *xdrs,
82 caddr_t addr,
83 u_int size,
84 enum xdr_op op)
85 {
86
87 xdrs->x_op = op;
88 xdrs->x_ops = &xdrmem_ops;
89 xdrs->x_private = xdrs->x_base = addr;
90 xdrs->x_handy = (size > INT_MAX) ? INT_MAX : size; /* XXX */
91 }
92
93 static void
xdrmem_destroy(XDR * xdrs)94 xdrmem_destroy(XDR *xdrs)
95 {
96 }
97
98 static bool_t
xdrmem_getlong(XDR * xdrs,long * lp)99 xdrmem_getlong(XDR *xdrs, long *lp)
100 {
101
102 if (xdrs->x_handy < BYTES_PER_XDR_UNIT)
103 return (FALSE);
104 else
105 xdrs->x_handy -= BYTES_PER_XDR_UNIT;
106 *lp = (long)(int32_t)ntohl(*((uint32_t *)(xdrs->x_private)));
107 xdrs->x_private = (char *)xdrs->x_private + BYTES_PER_XDR_UNIT;
108 return (TRUE);
109 }
110
111 static bool_t
xdrmem_putlong(XDR * xdrs,long * lp)112 xdrmem_putlong(XDR *xdrs, long *lp)
113 {
114
115 if (xdrs->x_handy < BYTES_PER_XDR_UNIT)
116 return (FALSE);
117 else
118 xdrs->x_handy -= BYTES_PER_XDR_UNIT;
119 *(int32_t *)xdrs->x_private = (int32_t)htonl((uint32_t)(*lp));
120 xdrs->x_private = (char *)xdrs->x_private + BYTES_PER_XDR_UNIT;
121 return (TRUE);
122 }
123
124 static bool_t
xdrmem_getbytes(XDR * xdrs,caddr_t addr,u_int len)125 xdrmem_getbytes(XDR *xdrs, caddr_t addr, u_int len)
126 {
127
128 if ((u_int)xdrs->x_handy < len)
129 return (FALSE);
130 else
131 xdrs->x_handy -= len;
132 memmove(addr, xdrs->x_private, len);
133 xdrs->x_private = (char *)xdrs->x_private + len;
134 return (TRUE);
135 }
136
137 static bool_t
xdrmem_putbytes(XDR * xdrs,caddr_t addr,u_int len)138 xdrmem_putbytes(XDR *xdrs, caddr_t addr, u_int len)
139 {
140
141 if ((u_int)xdrs->x_handy < len)
142 return (FALSE);
143 else
144 xdrs->x_handy -= len;
145 memmove(xdrs->x_private, addr, len);
146 xdrs->x_private = (char *)xdrs->x_private + len;
147 return (TRUE);
148 }
149
150 static u_int
xdrmem_getpos(XDR * xdrs)151 xdrmem_getpos(XDR *xdrs)
152 {
153 /*
154 * 11/3/95 - JRG - Rather than recast everything for 64 bit, just convert
155 * pointers to longs, then cast to int.
156 */
157 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
158 }
159
160 static bool_t
xdrmem_setpos(XDR * xdrs,u_int pos)161 xdrmem_setpos(XDR *xdrs, u_int pos)
162 {
163 caddr_t newaddr = xdrs->x_base + pos;
164 caddr_t lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
165
166 if ((long)newaddr > (long)lastaddr)
167 return (FALSE);
168 xdrs->x_private = newaddr;
169 xdrs->x_handy = (int)((long)lastaddr - (long)newaddr);
170 return (TRUE);
171 }
172
173 static rpc_inline_t *
xdrmem_inline(XDR * xdrs,int len)174 xdrmem_inline(XDR *xdrs, int len)
175 {
176 rpc_inline_t *buf = 0;
177
178 if (len >= 0 && xdrs->x_handy >= len) {
179 xdrs->x_handy -= len;
180 buf = (rpc_inline_t *) xdrs->x_private;
181 xdrs->x_private = (char *)xdrs->x_private + len;
182 }
183 return (buf);
184 }
185