Use CSTD and remove local CSTD settings which are no longer needed.
[dragonfly.git] / lib / libstand / rarp.c
CommitLineData
984263bc 1/* $NetBSD: rarp.c,v 1.16 1997/07/07 15:52:52 drochner Exp $ */
ff2aef30 2/* $DragonFly: src/lib/libstand/rarp.c,v 1.3 2005/12/11 02:27:26 swildner Exp $ */
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3
4/*
5 * Copyright (c) 1992 Regents of the University of California.
6 * All rights reserved.
7 *
8 * This software was developed by the Computer Systems Engineering group
9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
10 * contributed to Berkeley.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Lawrence Berkeley Laboratory and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 * @(#) Header: arp.c,v 1.5 93/07/15 05:52:26 leres Exp (LBL)
41 */
42#include <sys/param.h>
43#include <sys/socket.h>
44#include <net/if.h>
45#include <netinet/in.h>
46#include <netinet/if_ether.h>
47
48#include <netinet/in_systm.h>
49
50#include <string.h>
51
52#include "stand.h"
53#include "net.h"
54#include "netif.h"
55
56
57static ssize_t rarpsend(struct iodesc *, void *, size_t);
58static ssize_t rarprecv(struct iodesc *, void *, size_t, time_t);
59
60/*
61 * Ethernet (Reverse) Address Resolution Protocol (see RFC 903, and 826).
62 */
63int
ff2aef30 64rarp_getipaddress(int sock)
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65{
66 struct iodesc *d;
660c873b 67 struct ether_arp *ap;
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68 struct {
69 u_char header[ETHER_SIZE];
70 struct {
71 struct ether_arp arp;
72 u_char pad[18]; /* 60 - sizeof(arp) */
73 } data;
74 } wbuf;
75 struct {
76 u_char header[ETHER_SIZE];
77 struct {
78 struct ether_arp arp;
79 u_char pad[24]; /* extra space */
80 } data;
81 } rbuf;
82
83#ifdef RARP_DEBUG
84 if (debug)
85 printf("rarp: socket=%d\n", sock);
86#endif
87 if (!(d = socktodesc(sock))) {
88 printf("rarp: bad socket. %d\n", sock);
89 return (-1);
90 }
91#ifdef RARP_DEBUG
92 if (debug)
93 printf("rarp: d=%x\n", (u_int)d);
94#endif
95
96 bzero((char*)&wbuf.data, sizeof(wbuf.data));
97 ap = &wbuf.data.arp;
98 ap->arp_hrd = htons(ARPHRD_ETHER);
99 ap->arp_pro = htons(ETHERTYPE_IP);
100 ap->arp_hln = sizeof(ap->arp_sha); /* hardware address length */
101 ap->arp_pln = sizeof(ap->arp_spa); /* protocol address length */
102 ap->arp_op = htons(ARPOP_REVREQUEST);
103 bcopy(d->myea, ap->arp_sha, 6);
104 bcopy(d->myea, ap->arp_tha, 6);
105
106 if (sendrecv(d,
107 rarpsend, &wbuf.data, sizeof(wbuf.data),
108 rarprecv, &rbuf.data, sizeof(rbuf.data)) < 0)
109 {
110 printf("No response for RARP request\n");
111 return (-1);
112 }
113
114 ap = &rbuf.data.arp;
115 bcopy(ap->arp_tpa, (char *)&myip, sizeof(myip));
116#if 0
117 /* XXX - Can NOT assume this is our root server! */
118 bcopy(ap->arp_spa, (char *)&rootip, sizeof(rootip));
119#endif
120
121 /* Compute our "natural" netmask. */
122 if (IN_CLASSA(myip.s_addr))
123 netmask = IN_CLASSA_NET;
124 else if (IN_CLASSB(myip.s_addr))
125 netmask = IN_CLASSB_NET;
126 else
127 netmask = IN_CLASSC_NET;
128
129 d->myip = myip;
130 return (0);
131}
132
133/*
134 * Broadcast a RARP request (i.e. who knows who I am)
135 */
136static ssize_t
ff2aef30 137rarpsend(struct iodesc *d, void *pkt, size_t len)
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138{
139
140#ifdef RARP_DEBUG
141 if (debug)
142 printf("rarpsend: called\n");
143#endif
144
145 return (sendether(d, pkt, len, bcea, ETHERTYPE_REVARP));
146}
147
148/*
149 * Returns 0 if this is the packet we're waiting for
150 * else -1 (and errno == 0)
151 */
152static ssize_t
ff2aef30 153rarprecv(struct iodesc *d, void *pkt, size_t len, time_t tleft)
984263bc 154{
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155 ssize_t n;
156 struct ether_arp *ap;
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157 u_int16_t etype; /* host order */
158
159#ifdef RARP_DEBUG
160 if (debug)
161 printf("rarprecv: ");
162#endif
163
164 n = readether(d, pkt, len, tleft, &etype);
165 errno = 0; /* XXX */
166 if (n == -1 || n < sizeof(struct ether_arp)) {
167#ifdef RARP_DEBUG
168 if (debug)
169 printf("bad len=%d\n", n);
170#endif
171 return (-1);
172 }
173
174 if (etype != ETHERTYPE_REVARP) {
175#ifdef RARP_DEBUG
176 if (debug)
177 printf("bad type=0x%x\n", etype);
178#endif
179 return (-1);
180 }
181
182 ap = (struct ether_arp *)pkt;
183 if (ap->arp_hrd != htons(ARPHRD_ETHER) ||
184 ap->arp_pro != htons(ETHERTYPE_IP) ||
185 ap->arp_hln != sizeof(ap->arp_sha) ||
186 ap->arp_pln != sizeof(ap->arp_spa) )
187 {
188#ifdef RARP_DEBUG
189 if (debug)
190 printf("bad hrd/pro/hln/pln\n");
191#endif
192 return (-1);
193 }
194
195 if (ap->arp_op != htons(ARPOP_REVREPLY)) {
196#ifdef RARP_DEBUG
197 if (debug)
198 printf("bad op=0x%x\n", ntohs(ap->arp_op));
199#endif
200 return (-1);
201 }
202
203 /* Is the reply for our Ethernet address? */
204 if (bcmp(ap->arp_tha, d->myea, 6)) {
205#ifdef RARP_DEBUG
206 if (debug)
207 printf("unwanted address\n");
208#endif
209 return (-1);
210 }
211
212 /* We have our answer. */
213#ifdef RARP_DEBUG
214 if (debug)
215 printf("got it\n");
216#endif
217 return (n);
218}