xref: /illumos-gate/usr/src/common/net/dhcp/dhcpinfo.c (revision c40a6cd7)
1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate  * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
24*7c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate  */
26*7c478bd9Sstevel@tonic-gate 
27*7c478bd9Sstevel@tonic-gate #include <sys/types.h>
28*7c478bd9Sstevel@tonic-gate #include <stddef.h>
29*7c478bd9Sstevel@tonic-gate #include <stdlib.h>
30*7c478bd9Sstevel@tonic-gate #include <strings.h>
31*7c478bd9Sstevel@tonic-gate #include <netinet/in.h>
32*7c478bd9Sstevel@tonic-gate #include <netinet/dhcp.h>
33*7c478bd9Sstevel@tonic-gate #include "dhcp_impl.h"
34*7c478bd9Sstevel@tonic-gate 
35*7c478bd9Sstevel@tonic-gate /*
36*7c478bd9Sstevel@tonic-gate  * Fetch a copy of the DHCP-supplied value of the parameter requested
37*7c478bd9Sstevel@tonic-gate  * by code in value, and the parameter value length in *vallenp.
38*7c478bd9Sstevel@tonic-gate  *
39*7c478bd9Sstevel@tonic-gate  * Return values:
40*7c478bd9Sstevel@tonic-gate  *
41*7c478bd9Sstevel@tonic-gate  *      B_FALSE         If invalid code, or no parameter value.
42*7c478bd9Sstevel@tonic-gate  *
43*7c478bd9Sstevel@tonic-gate  *      B_TRUE          Valid code which has a parameter value.
44*7c478bd9Sstevel@tonic-gate  *                      *vallenp is set to the parameter value length.
45*7c478bd9Sstevel@tonic-gate  *                      If the parameter value length is less than or
46*7c478bd9Sstevel@tonic-gate  *                      equal to *vallenp, value is set to the parameter
47*7c478bd9Sstevel@tonic-gate  *                      value.
48*7c478bd9Sstevel@tonic-gate  */
49*7c478bd9Sstevel@tonic-gate 
50*7c478bd9Sstevel@tonic-gate boolean_t
dhcp_getinfo_pl(PKT_LIST * pl,uchar_t optcat,uint16_t code,uint16_t optsize,void * value,size_t * vallenp)51*7c478bd9Sstevel@tonic-gate dhcp_getinfo_pl(PKT_LIST *pl, uchar_t optcat, uint16_t code, uint16_t optsize,
52*7c478bd9Sstevel@tonic-gate     void *value, size_t *vallenp)
53*7c478bd9Sstevel@tonic-gate {
54*7c478bd9Sstevel@tonic-gate 
55*7c478bd9Sstevel@tonic-gate 	if (pl == NULL)
56*7c478bd9Sstevel@tonic-gate 		return (B_FALSE);
57*7c478bd9Sstevel@tonic-gate 
58*7c478bd9Sstevel@tonic-gate 	if (optcat == DSYM_STANDARD) {
59*7c478bd9Sstevel@tonic-gate 		if (code > DHCP_LAST_OPT)
60*7c478bd9Sstevel@tonic-gate 			return (B_FALSE);
61*7c478bd9Sstevel@tonic-gate 
62*7c478bd9Sstevel@tonic-gate 		if (pl->opts[code] == NULL)
63*7c478bd9Sstevel@tonic-gate 			return (B_FALSE);
64*7c478bd9Sstevel@tonic-gate 
65*7c478bd9Sstevel@tonic-gate 		if (*vallenp < pl->opts[code]->len) {
66*7c478bd9Sstevel@tonic-gate 			*vallenp = pl->opts[code]->len;
67*7c478bd9Sstevel@tonic-gate 			return (B_TRUE);
68*7c478bd9Sstevel@tonic-gate 		}
69*7c478bd9Sstevel@tonic-gate 
70*7c478bd9Sstevel@tonic-gate 		bcopy(pl->opts[code]->value, value, pl->opts[code]->len);
71*7c478bd9Sstevel@tonic-gate 		*vallenp = pl->opts[code]->len;
72*7c478bd9Sstevel@tonic-gate 
73*7c478bd9Sstevel@tonic-gate 	} else if (optcat == DSYM_VENDOR) {
74*7c478bd9Sstevel@tonic-gate 		if (code > VS_OPTION_END)
75*7c478bd9Sstevel@tonic-gate 			return (B_FALSE);
76*7c478bd9Sstevel@tonic-gate 
77*7c478bd9Sstevel@tonic-gate 		if (pl->vs[code] == NULL)
78*7c478bd9Sstevel@tonic-gate 			return (B_FALSE);
79*7c478bd9Sstevel@tonic-gate 
80*7c478bd9Sstevel@tonic-gate 		if (*vallenp < pl->vs[code]->len) {
81*7c478bd9Sstevel@tonic-gate 			*vallenp = pl->vs[code]->len;
82*7c478bd9Sstevel@tonic-gate 			return (B_TRUE);
83*7c478bd9Sstevel@tonic-gate 		}
84*7c478bd9Sstevel@tonic-gate 
85*7c478bd9Sstevel@tonic-gate 		bcopy(pl->vs[code]->value, value, pl->vs[code]->len);
86*7c478bd9Sstevel@tonic-gate 		*vallenp = pl->vs[code]->len;
87*7c478bd9Sstevel@tonic-gate 
88*7c478bd9Sstevel@tonic-gate 	} else if (optcat == DSYM_FIELD) {
89*7c478bd9Sstevel@tonic-gate 		if (code + optsize > sizeof (PKT))
90*7c478bd9Sstevel@tonic-gate 			return (B_FALSE);
91*7c478bd9Sstevel@tonic-gate 
92*7c478bd9Sstevel@tonic-gate 		if (*vallenp < optsize) {
93*7c478bd9Sstevel@tonic-gate 			*vallenp = optsize;
94*7c478bd9Sstevel@tonic-gate 			return (B_TRUE);
95*7c478bd9Sstevel@tonic-gate 		}
96*7c478bd9Sstevel@tonic-gate 
97*7c478bd9Sstevel@tonic-gate 		*vallenp = optsize;
98*7c478bd9Sstevel@tonic-gate 		bcopy((caddr_t)pl->pkt + code, value, optsize);
99*7c478bd9Sstevel@tonic-gate 
100*7c478bd9Sstevel@tonic-gate 	} else
101*7c478bd9Sstevel@tonic-gate 		return (B_FALSE);
102*7c478bd9Sstevel@tonic-gate 
103*7c478bd9Sstevel@tonic-gate 	return (B_TRUE);
104*7c478bd9Sstevel@tonic-gate }
105