release/src/router/nfs-utils/utils/gssd/write_bytes.h

   1 /*
   2   Copyright (c) 2004 The Regents of the University of Michigan.
   3   All rights reserved.
   4
   5   Redistribution and use in source and binary forms, with or without
   6   modification, are permitted provided that the following conditions
   7   are met:
   8
   9   1. Redistributions of source code must retain the above copyright
  10      notice, this list of conditions and the following disclaimer.
  11   2. Redistributions in binary form must reproduce the above copyright
  12      notice, this list of conditions and the following disclaimer in the
  13      documentation and/or other materials provided with the distribution.
  14   3. Neither the name of the University nor the names of its
  15      contributors may be used to endorse or promote products derived
  16      from this software without specific prior written permission.
  17
  18   THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  19   WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  20   MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21   DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  25   BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  26   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  27   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29 */
  30
  31 #ifndef _WRITE_BYTES_H_
  32 #define _WRITE_BYTES_H_
  33
  34 #include <stdlib.h>
  35 #include <sys/types.h>
  36 #include <netinet/in.h>         /* for ntohl */
  37
  38 inline static int
  39 write_bytes(char **ptr, const char *end, const void *arg, int arg_len)
  40 {
  41         char *p = *ptr, *arg_end;
  42
  43         arg_end = p + arg_len;
  44         if (arg_end > end || arg_end < p)
  45                 return -1;
  46         memcpy(p, arg, arg_len);
  47         *ptr = arg_end;
  48         return 0;
  49 }
  50
  51 #define WRITE_BYTES(p, end, arg) write_bytes(p, end, &arg, sizeof(arg))
  52
  53 inline static int
  54 write_buffer(char **p, char *end, gss_buffer_desc *arg)
  55 {
  56         int len = (int)arg->length;             /* make an int out of size_t */
  57         if (WRITE_BYTES(p, end, len))
  58                 return -1;
  59         if (*p + len > end)
  60                 return -1;
  61         memcpy(*p, arg->value, len);
  62         *p += len;
  63         return 0;
  64 }
  65
  66 inline static int
  67 write_oid(char **p, char *end, gss_OID_desc *arg)
  68 {
  69         int len = (int)arg->length;             /* make an int out of size_t */
  70         if (WRITE_BYTES(p, end, len))
  71                 return -1;
  72         if (*p + arg->length > end)
  73                 return -1;
  74         memcpy(*p, arg->elements, len);
  75         *p += len;
  76         return 0;
  77 }
  78
  79 static inline int
  80 get_bytes(char **ptr, const char *end, void *res, int len)
  81 {
  82         char *p, *q;
  83         p = *ptr;
  84         q = p + len;
  85         if (q > end || q < p)
  86                 return -1;
  87         memcpy(res, p, len);
  88         *ptr = q;
  89         return 0;
  90 }
  91
  92 static inline int
  93 get_buffer(char **ptr, const char *end, gss_buffer_desc *res)
  94 {
  95         char *p, *q;
  96         p = *ptr;
  97         int len;
  98         if (get_bytes(&p, end, &len, sizeof(len)))
  99                 return -1;
 100         res->length = len;              /* promote to size_t if necessary */
 101         q = p + res->length;
 102         if (q > end || q < p)
 103                 return -1;
 104         if (!(res->value = malloc(res->length)))
 105                 return -1;
 106         memcpy(res->value, p, res->length);
 107         *ptr = q;
 108         return 0;
 109 }
 110
 111 static inline int
 112 xdr_get_u32(u_int32_t **ptr, const u_int32_t *end, u_int32_t *res)
 113 {
 114         if (get_bytes((char **)ptr, (char *)end, res, sizeof(res)))
 115                 return -1;
 116         *res = ntohl(*res);
 117         return 0;
 118 }
 119
 120 static inline int
 121 xdr_get_buffer(u_int32_t **ptr, const u_int32_t *end, gss_buffer_desc *res)
 122 {
 123         u_int32_t *p, *q;
 124         u_int32_t len;
 125         p = *ptr;
 126         if (xdr_get_u32(&p, end, &len))
 127                 return -1;
 128         res->length = len;
 129         q = p + ((res->length + 3) >> 2);
 130         if (q > end || q < p)
 131                 return -1;
 132         if (!(res->value = malloc(res->length)))
 133                 return -1;
 134         memcpy(res->value, p, res->length);
 135         *ptr = q;
 136         return 0;
 137 }
 138
 139 static inline int
 140 xdr_write_u32(u_int32_t **ptr, const u_int32_t *end, u_int32_t arg)
 141 {
 142         u_int32_t tmp;
 143
 144         tmp = htonl(arg);
 145         return WRITE_BYTES((char **)ptr, (char *)end, tmp);
 146 }
 147
 148 static inline int
 149 xdr_write_buffer(u_int32_t **ptr, const u_int32_t *end, gss_buffer_desc *arg)
 150 {
 151         int len = arg->length;
 152         if (xdr_write_u32(ptr, end, len))
 153                 return -1;
 154         return write_bytes((char **)ptr, (char *)end, arg->value,
 155                            (arg->length + 3) & ~3);
 156 }
 157
 158 #endif /* _WRITE_BYTES_H_ */