Remove advertising header from src
[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.
956f4b31 20 * 3. Neither the name of the University nor the names of its contributors
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21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#) Header: arp.c,v 1.5 93/07/15 05:52:26 leres Exp (LBL)
37 */
38#include <sys/param.h>
39#include <sys/socket.h>
40#include <net/if.h>
41#include <netinet/in.h>
42#include <netinet/if_ether.h>
43
44#include <netinet/in_systm.h>
45
46#include <string.h>
47
48#include "stand.h"
49#include "net.h"
50#include "netif.h"
51
52
53static ssize_t rarpsend(struct iodesc *, void *, size_t);
54static ssize_t rarprecv(struct iodesc *, void *, size_t, time_t);
55
56/*
57 * Ethernet (Reverse) Address Resolution Protocol (see RFC 903, and 826).
58 */
59int
ff2aef30 60rarp_getipaddress(int sock)
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61{
62 struct iodesc *d;
660c873b 63 struct ether_arp *ap;
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64 struct {
65 u_char header[ETHER_SIZE];
66 struct {
67 struct ether_arp arp;
68 u_char pad[18]; /* 60 - sizeof(arp) */
69 } data;
70 } wbuf;
71 struct {
72 u_char header[ETHER_SIZE];
73 struct {
74 struct ether_arp arp;
75 u_char pad[24]; /* extra space */
76 } data;
77 } rbuf;
78
79#ifdef RARP_DEBUG
80 if (debug)
81 printf("rarp: socket=%d\n", sock);
82#endif
83 if (!(d = socktodesc(sock))) {
84 printf("rarp: bad socket. %d\n", sock);
85 return (-1);
86 }
87#ifdef RARP_DEBUG
88 if (debug)
89 printf("rarp: d=%x\n", (u_int)d);
90#endif
91
92 bzero((char*)&wbuf.data, sizeof(wbuf.data));
93 ap = &wbuf.data.arp;
94 ap->arp_hrd = htons(ARPHRD_ETHER);
95 ap->arp_pro = htons(ETHERTYPE_IP);
96 ap->arp_hln = sizeof(ap->arp_sha); /* hardware address length */
97 ap->arp_pln = sizeof(ap->arp_spa); /* protocol address length */
98 ap->arp_op = htons(ARPOP_REVREQUEST);
99 bcopy(d->myea, ap->arp_sha, 6);
100 bcopy(d->myea, ap->arp_tha, 6);
101
102 if (sendrecv(d,
103 rarpsend, &wbuf.data, sizeof(wbuf.data),
104 rarprecv, &rbuf.data, sizeof(rbuf.data)) < 0)
105 {
106 printf("No response for RARP request\n");
107 return (-1);
108 }
109
110 ap = &rbuf.data.arp;
111 bcopy(ap->arp_tpa, (char *)&myip, sizeof(myip));
112#if 0
113 /* XXX - Can NOT assume this is our root server! */
114 bcopy(ap->arp_spa, (char *)&rootip, sizeof(rootip));
115#endif
116
117 /* Compute our "natural" netmask. */
118 if (IN_CLASSA(myip.s_addr))
119 netmask = IN_CLASSA_NET;
120 else if (IN_CLASSB(myip.s_addr))
121 netmask = IN_CLASSB_NET;
122 else
123 netmask = IN_CLASSC_NET;
124
125 d->myip = myip;
126 return (0);
127}
128
129/*
130 * Broadcast a RARP request (i.e. who knows who I am)
131 */
132static ssize_t
ff2aef30 133rarpsend(struct iodesc *d, void *pkt, size_t len)
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134{
135
136#ifdef RARP_DEBUG
137 if (debug)
138 printf("rarpsend: called\n");
139#endif
140
141 return (sendether(d, pkt, len, bcea, ETHERTYPE_REVARP));
142}
143
144/*
145 * Returns 0 if this is the packet we're waiting for
146 * else -1 (and errno == 0)
147 */
148static ssize_t
ff2aef30 149rarprecv(struct iodesc *d, void *pkt, size_t len, time_t tleft)
984263bc 150{
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151 ssize_t n;
152 struct ether_arp *ap;
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153 u_int16_t etype; /* host order */
154
155#ifdef RARP_DEBUG
156 if (debug)
157 printf("rarprecv: ");
158#endif
159
160 n = readether(d, pkt, len, tleft, &etype);
161 errno = 0; /* XXX */
162 if (n == -1 || n < sizeof(struct ether_arp)) {
163#ifdef RARP_DEBUG
164 if (debug)
165 printf("bad len=%d\n", n);
166#endif
167 return (-1);
168 }
169
170 if (etype != ETHERTYPE_REVARP) {
171#ifdef RARP_DEBUG
172 if (debug)
173 printf("bad type=0x%x\n", etype);
174#endif
175 return (-1);
176 }
177
178 ap = (struct ether_arp *)pkt;
179 if (ap->arp_hrd != htons(ARPHRD_ETHER) ||
180 ap->arp_pro != htons(ETHERTYPE_IP) ||
181 ap->arp_hln != sizeof(ap->arp_sha) ||
182 ap->arp_pln != sizeof(ap->arp_spa) )
183 {
184#ifdef RARP_DEBUG
185 if (debug)
186 printf("bad hrd/pro/hln/pln\n");
187#endif
188 return (-1);
189 }
190
191 if (ap->arp_op != htons(ARPOP_REVREPLY)) {
192#ifdef RARP_DEBUG
193 if (debug)
194 printf("bad op=0x%x\n", ntohs(ap->arp_op));
195#endif
196 return (-1);
197 }
198
199 /* Is the reply for our Ethernet address? */
200 if (bcmp(ap->arp_tha, d->myea, 6)) {
201#ifdef RARP_DEBUG
202 if (debug)
203 printf("unwanted address\n");
204#endif
205 return (-1);
206 }
207
208 /* We have our answer. */
209#ifdef RARP_DEBUG
210 if (debug)
211 printf("got it\n");
212#endif
213 return (n);
214}