1/*	$NetBSD: hwaddr.c,v 1.9 2007/05/27 16:31:42 tls Exp $	*/
2
3#include <sys/cdefs.h>
4#ifndef lint
5__RCSID("$NetBSD: hwaddr.c,v 1.9 2007/05/27 16:31:42 tls Exp $");
6#endif
7
8/*
9 * hwaddr.c - routines that deal with hardware addresses.
10 * (i.e. Ethernet)
11 */
12
13#include <sys/types.h>
14#include <sys/param.h>
15#include <sys/socket.h>
16#include <sys/ioctl.h>
17
18#if defined(SUNOS) || defined(SVR4)
19#include <sys/sockio.h>
20#endif
21#ifdef	SVR4
22#include <sys/stream.h>
23#include <stropts.h>
24#include <fcntl.h>
25#endif
26
27#include <net/if_arp.h>
28#include <netinet/in.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <strings.h>
32#ifndef	NO_UNISTD
33#include <unistd.h>
34#endif
35#include <syslog.h>
36#include <arpa/inet.h>
37
38#include "bptypes.h"
39#include "hwaddr.h"
40#include "report.h"
41
42extern int debug;
43
44/*
45 * Hardware address lengths (in bytes) and network name based on hardware
46 * type code.  List in order specified by Assigned Numbers RFC; Array index
47 * is hardware type code.  Entries marked as zero are unknown to the author
48 * at this time.  .  .  .
49 */
50
51struct hwinfo hwinfolist[] =
52{
53	{0, "Reserved"},			/* Type 0:  Reserved (don't use this)   */
54	{6, "Ethernet"},			/* Type 1:  10Mb Ethernet (48 bits)	*/
55	{1, "3Mb Ethernet"},		/* Type 2:   3Mb Ethernet (8 bits)	*/
56	{0, "AX.25"},				/* Type 3:  Amateur Radio AX.25		*/
57	{1, "ProNET"},				/* Type 4:  Proteon ProNET Token Ring   */
58	{0, "Chaos"},				/* Type 5:  Chaos			*/
59	{6, "IEEE 802"},			/* Type 6:  IEEE 802 Networks		*/
60	{0, "ARCNET"}				/* Type 7:  ARCNET			*/
61};
62size_t hwinfocnt = sizeof(hwinfolist) / sizeof(hwinfolist[0]);
63
64
65/*
66 * Setup the arp cache so that IP address 'ia' will be temporarily
67 * bound to hardware address 'ha' of length 'len'.
68 * s is the socket fd.
69 */
70void
71setarp(int s, struct in_addr *ia, u_char *ha, int len)
72{
73#ifdef	SIOCSARP
74	struct arpreq arpreq;		/* Arp request ioctl block */
75	struct sockaddr_in *si;
76#ifdef	SVR4
77	int fd;
78	struct strioctl iocb;
79#endif	/* SVR4 */
80
81	bzero((caddr_t) & arpreq, sizeof(arpreq));
82	arpreq.arp_flags = ATF_INUSE | ATF_COM;
83
84	/* Set up the protocol address. */
85	arpreq.arp_pa.sa_family = AF_INET;
86	si = (struct sockaddr_in *) &arpreq.arp_pa;
87	si->sin_addr = *ia;
88
89	/* Set up the hardware address. */
90	bcopy(ha, arpreq.arp_ha.sa_data, len);
91
92#ifdef	SVR4
93	/*
94	 * And now the stuff for System V Rel 4.x which does not
95	 * appear to allow SIOCxxx ioctls on a socket descriptor.
96	 * Thanks to several people: (all sent the same fix)
97	 *   Barney Wolff <barney@databus.com>,
98	 *   bear@upsys.se (Bj|rn Sj|holm),
99	 *   Michael Kuschke <Michael.Kuschke@Materna.DE>,
100	 */
101	if ((fd=open("/dev/arp", O_RDWR)) < 0) {
102	    report(LOG_ERR, "open /dev/arp: %s\n", get_errmsg());
103	}
104	iocb.ic_cmd = SIOCSARP;
105	iocb.ic_timout = 0;
106	iocb.ic_dp = (char *)&arpreq;
107	iocb.ic_len = sizeof(arpreq);
108	if (ioctl(fd, I_STR, (caddr_t)&iocb) < 0) {
109	    report(LOG_ERR, "ioctl I_STR: %s\n", get_errmsg());
110	}
111	close (fd);
112
113#else	/* SVR4 */
114	/*
115	 * On SunOS, the ioctl sometimes returns ENXIO, and it
116	 * appears to happen when the ARP cache entry you tried
117	 * to add is already in the cache.  (Sigh...)
118	 * XXX - Should this error simply be ignored? -gwr
119	 */
120	if (ioctl(s, SIOCSARP, (caddr_t) & arpreq) < 0) {
121		report(LOG_ERR, "ioctl SIOCSARP: %s", get_errmsg());
122	}
123#endif	/* SVR4 */
124#else	/* SIOCSARP */
125	/*
126	 * Oh well, SIOCSARP is not defined.  Just run arp(8).
127	 * XXX - Gag!
128	 */
129	int status;
130	char buf[256];
131	char *a;
132
133	a = inet_ntoa(*ia);
134	snprintf(buf, sizeof(buf), "arp -d %s; arp -s %s %s temp",
135	    a, a, haddrtoa(ha, len));
136	if (debug > 2)
137		report(LOG_INFO, "%s", buf);
138	status = system(buf);
139	if (status)
140		report(LOG_ERR, "arp failed, exit code=0x%x", status);
141	return;
142#endif	/* SIOCSARP */
143}
144
145
146/*
147 * Convert a hardware address to an ASCII string.
148 */
149char *
150haddrtoa(u_char *haddr, int hlen)
151{
152	static char haddrbuf[3 * MAXHADDRLEN + 1];
153	char *bufptr;
154
155	if (hlen > MAXHADDRLEN)
156		hlen = MAXHADDRLEN;
157
158	bufptr = haddrbuf;
159	while (hlen > 0) {
160		snprintf(bufptr, sizeof(haddrbuf) - (bufptr - haddrbuf),
161		    "%02X:", (unsigned) (*haddr++ & 0xFF));
162		bufptr += 3;
163		hlen--;
164	}
165	bufptr[-1] = 0;
166	return (haddrbuf);
167}
168
169
170/*
171 * haddr_conv802()
172 * --------------
173 *
174 * Converts a backwards address to a canonical address and a canonical address
175 * to a backwards address.
176 *
177 * INPUTS:
178 *  adr_in - pointer to six byte string to convert (unsigned char *)
179 *  addr_len - how many bytes to convert
180 *
181 * OUTPUTS:
182 *  addr_out - The string is updated to contain the converted address.
183 *
184 * CALLER:
185 *  many
186 *
187 * DATA:
188 *  Uses conv802table to bit-reverse the address bytes.
189 */
190
191static u_char conv802table[256] =
192{
193	/* 0x00 */ 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
194	/* 0x08 */ 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
195	/* 0x10 */ 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
196	/* 0x18 */ 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
197	/* 0x20 */ 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
198	/* 0x28 */ 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
199	/* 0x30 */ 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
200	/* 0x38 */ 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
201	/* 0x40 */ 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
202	/* 0x48 */ 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
203	/* 0x50 */ 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
204	/* 0x58 */ 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
205	/* 0x60 */ 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
206	/* 0x68 */ 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
207	/* 0x70 */ 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
208	/* 0x78 */ 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
209	/* 0x80 */ 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
210	/* 0x88 */ 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
211	/* 0x90 */ 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
212	/* 0x98 */ 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
213	/* 0xA0 */ 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
214	/* 0xA8 */ 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
215	/* 0xB0 */ 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
216	/* 0xB8 */ 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
217	/* 0xC0 */ 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
218	/* 0xC8 */ 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
219	/* 0xD0 */ 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
220	/* 0xD8 */ 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
221	/* 0xE0 */ 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
222	/* 0xE8 */ 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
223	/* 0xF0 */ 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
224	/* 0xF8 */ 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF,
225};
226
227void
228haddr_conv802(u_char *addr_in, u_char *addr_out, int len)
229{
230	u_char *lim;
231
232	lim = addr_out + len;
233	while (addr_out < lim)
234		*addr_out++ = conv802table[*addr_in++];
235}
236
237#if 0
238/*
239 * For the record, here is a program to generate the
240 * bit-reverse table above.
241 */
242static int
243bitrev(int n)
244{
245	int i, r;
246
247	r = 0;
248	for (i = 0; i < 8; i++) {
249		r <<= 1;
250		r |= (n & 1);
251		n >>= 1;
252	}
253	return r;
254}
255
256main(void)
257{
258	int i;
259	for (i = 0; i <= 0xFF; i++) {
260		if ((i & 7) == 0)
261			printf("/* 0x%02X */", i);
262		printf(" 0x%02X,", bitrev(i));
263		if ((i & 7) == 7)
264			printf("\n");
265	}
266}
267
268#endif
269
270/*
271 * Local Variables:
272 * tab-width: 4
273 * c-indent-level: 4
274 * c-argdecl-indent: 4
275 * c-continued-statement-offset: 4
276 * c-continued-brace-offset: -4
277 * c-label-offset: -4
278 * c-brace-offset: 0
279 * End:
280 */
281