usr/src/common/net/dhcp/dhcpinfo.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/types.h>
  30 #include <stddef.h>
  31 #include <stdlib.h>
  32 #include <strings.h>
  33 #include <netinet/in.h>
  34 #include <netinet/dhcp.h>
  35 #include "dhcp_impl.h"
  36
  37 /*
  38  * Fetch a copy of the DHCP-supplied value of the parameter requested
  39  * by code in value, and the parameter value length in *vallenp.
  40  *
  41  * Return values:
  42  *
  43  *      B_FALSE         If invalid code, or no parameter value.
  44  *
  45  *      B_TRUE          Valid code which has a parameter value.
  46  *                      *vallenp is set to the parameter value length.
  47  *                      If the parameter value length is less than or
  48  *                      equal to *vallenp, value is set to the parameter
  49  *                      value.
  50  */
  51
  52 boolean_t
  53 dhcp_getinfo_pl(PKT_LIST *pl, uchar_t optcat, uint16_t code, uint16_t optsize,
  54     void *value, size_t *vallenp)
  55 {
  56
  57         if (pl == NULL)
  58                 return (B_FALSE);
  59
  60         if (optcat == DSYM_STANDARD) {
  61                 if (code > DHCP_LAST_OPT)
  62                         return (B_FALSE);
  63
  64                 if (pl->opts[code] == NULL)
  65                         return (B_FALSE);
  66
  67                 if (*vallenp < pl->opts[code]->len) {
  68                         *vallenp = pl->opts[code]->len;
  69                         return (B_TRUE);
  70                 }
  71
  72                 bcopy(pl->opts[code]->value, value, pl->opts[code]->len);
  73                 *vallenp = pl->opts[code]->len;
  74
  75         } else if (optcat == DSYM_VENDOR) {
  76                 if (code > VS_OPTION_END)
  77                         return (B_FALSE);
  78
  79                 if (pl->vs[code] == NULL)
  80                         return (B_FALSE);
  81
  82                 if (*vallenp < pl->vs[code]->len) {
  83                         *vallenp = pl->vs[code]->len;
  84                         return (B_TRUE);
  85                 }
  86
  87                 bcopy(pl->vs[code]->value, value, pl->vs[code]->len);
  88                 *vallenp = pl->vs[code]->len;
  89
  90         } else if (optcat == DSYM_FIELD) {
  91                 if (code + optsize > sizeof (PKT))
  92                         return (B_FALSE);
  93
  94                 if (*vallenp < optsize) {
  95                         *vallenp = optsize;
  96                         return (B_TRUE);
  97                 }
  98
  99                 *vallenp = optsize;
 100                 bcopy((caddr_t)pl->pkt + code, value, optsize);
 101
 102         } else
 103                 return (B_FALSE);
 104
 105         return (B_TRUE);
 106 }