1/*
2 * hwaddr.c - routines that deal with hardware addresses.
3 * (i.e. Ethernet)
4 */
5
6#include <sys/types.h>
7#include <sys/param.h>
8#include <sys/socket.h>
9#include <sys/ioctl.h>
10
11#if defined(SUNOS) || defined(SVR4)
12#include <sys/sockio.h>
13#endif
14#ifdef	SVR4
15#include <sys/stream.h>
16#include <stropts.h>
17#include <fcntl.h>
18#endif
19
20#ifdef _AIX32
21#include <sys/time.h>	/* for struct timeval in net/if.h */
22#include <net/if.h> 	/* for struct ifnet in net/if_arp.h */
23#endif
24
25#include <net/if_arp.h>
26#include <netinet/in.h>
27
28#ifdef WIN_TCP
29#include <netinet/if_ether.h>
30#include <sys/dlpi.h>
31#endif
32
33#include <stdio.h>
34#ifndef	NO_UNISTD
35#include <unistd.h>
36#endif
37#include <syslog.h>
38
39#ifndef	ATF_INUSE	/* Not defined on some systems (i.e. Linux) */
40#define	ATF_INUSE 0
41#endif
42
43/* For BSD 4.4, set arp entry by writing to routing socket */
44#if defined(BSD)
45#if BSD >= 199306
46extern int bsd_arp_set(struct in_addr *, char *, int);
47#endif
48#endif
49
50#include "bptypes.h"
51#include "hwaddr.h"
52#include "report.h"
53
54extern int debug;
55
56/*
57 * Hardware address lengths (in bytes) and network name based on hardware
58 * type code.  List in order specified by Assigned Numbers RFC; Array index
59 * is hardware type code.  Entries marked as zero are unknown to the author
60 * at this time.  .  .  .
61 */
62
63struct hwinfo hwinfolist[] =
64{
65	{0, "Reserved"},			/* Type 0:  Reserved (don't use this)   */
66	{6, "Ethernet"},			/* Type 1:  10Mb Ethernet (48 bits)	*/
67	{1, "3Mb Ethernet"},		/* Type 2:   3Mb Ethernet (8 bits)	*/
68	{0, "AX.25"},				/* Type 3:  Amateur Radio AX.25		*/
69	{1, "ProNET"},				/* Type 4:  Proteon ProNET Token Ring   */
70	{0, "Chaos"},				/* Type 5:  Chaos			*/
71	{6, "IEEE 802"},			/* Type 6:  IEEE 802 Networks		*/
72	{0, "ARCNET"}				/* Type 7:  ARCNET			*/
73};
74int hwinfocnt = sizeof(hwinfolist) / sizeof(hwinfolist[0]);
75
76
77/*
78 * Setup the arp cache so that IP address 'ia' will be temporarily
79 * bound to hardware address 'ha' of length 'len'.
80 */
81void
82setarp(int s, struct in_addr *ia, int hafamily, u_char *haddr, int halen)
83{
84#ifdef	SIOCSARP
85#ifdef	WIN_TCP
86	/* This is an SVR4 with different networking code from
87	 * Wollongong WIN-TCP.  Not quite like the Lachman code.
88	 * Code from: drew@drewsun.FEITH.COM (Andrew B. Sudell)
89	 */
90#undef	SIOCSARP
91#define	SIOCSARP ARP_ADD
92	struct arptab arpreq;		/* Arp table entry */
93
94	bzero((caddr_t) &arpreq, sizeof(arpreq));
95	arpreq.at_flags = ATF_COM;
96
97	/* Set up IP address */
98	arpreq.at_in = ia->s_addr;
99
100	/* Set up Hardware Address */
101	bcopy(haddr, arpreq.at_enaddr, halen);
102
103	/* Set the Date Link type. */
104	/* XXX - Translate (hafamily) to dltype somehow? */
105	arpreq.at_dltype = DL_ETHER;
106
107#else	/* WIN_TCP */
108	/* Good old Berkeley way. */
109	struct arpreq arpreq;		/* Arp request ioctl block */
110	struct sockaddr_in *si;
111	char *p;
112
113	bzero((caddr_t) &arpreq, sizeof(arpreq));
114	arpreq.arp_flags = ATF_INUSE | ATF_COM;
115
116	/* Set up the protocol address. */
117	arpreq.arp_pa.sa_family = AF_INET;
118	si = (struct sockaddr_in *) &arpreq.arp_pa;
119	si->sin_addr = *ia;
120
121	/* Set up the hardware address. */
122#ifdef	__linux__	/* XXX - Do others need this? -gwr */
123	/*
124	 * Linux requires the sa_family field set.
125	 * longyear@netcom.com (Al Longyear)
126	 */
127	arpreq.arp_ha.sa_family = hafamily;
128#endif	/* linux */
129
130	/* This variable is just to help catch type mismatches. */
131	p = arpreq.arp_ha.sa_data;
132	bcopy(haddr, p, halen);
133#endif	/* WIN_TCP */
134
135#ifdef	SVR4
136	/*
137	 * And now the stuff for System V Rel 4.x which does not
138	 * appear to allow SIOCxxx ioctls on a socket descriptor.
139	 * Thanks to several people: (all sent the same fix)
140	 *   Barney Wolff <barney@databus.com>,
141	 *   bear@upsys.se (Bj|rn Sj|holm),
142	 *   Michael Kuschke <Michael.Kuschke@Materna.DE>,
143	 */
144	{
145		int fd;
146		struct strioctl iocb;
147
148		if ((fd=open("/dev/arp", O_RDWR)) < 0) {
149			report(LOG_ERR, "open /dev/arp: %s\n", get_errmsg());
150		}
151		iocb.ic_cmd = SIOCSARP;
152		iocb.ic_timout = 0;
153		iocb.ic_dp = (char *)&arpreq;
154		iocb.ic_len = sizeof(arpreq);
155		if (ioctl(fd, I_STR, (caddr_t)&iocb) < 0) {
156			report(LOG_ERR, "ioctl I_STR: %s\n", get_errmsg());
157		}
158		close (fd);
159	}
160#else	/* SVR4 */
161	/*
162	 * On SunOS, the ioctl sometimes returns ENXIO, and it
163	 * appears to happen when the ARP cache entry you tried
164	 * to add is already in the cache.  (Sigh...)
165	 * XXX - Should this error simply be ignored? -gwr
166	 */
167	if (ioctl(s, SIOCSARP, (caddr_t) &arpreq) < 0) {
168		report(LOG_ERR, "ioctl SIOCSARP: %s", get_errmsg());
169	}
170#endif	/* SVR4 */
171#else	/* SIOCSARP */
172#if defined(BSD) && (BSD >= 199306)
173	bsd_arp_set(ia, haddr, halen);
174#else
175	/*
176	 * Oh well, SIOCSARP is not defined.  Just run arp(8).
177	 * Need to delete partial entry first on some systems.
178	 * XXX - Gag!
179	 */
180	int status;
181	char buf[256];
182	char *a;
183	extern char *inet_ntoa();
184
185	a = inet_ntoa(*ia);
186	snprintf(buf, sizeof(buf), "arp -d %s; arp -s %s %s temp",
187			a, a, haddrtoa(haddr, halen));
188	if (debug > 2)
189		report(LOG_INFO, "%s", buf);
190	status = system(buf);
191	if (status)
192		report(LOG_ERR, "arp failed, exit code=0x%x", status);
193	return;
194#endif	/* ! 4.4 BSD */
195#endif	/* SIOCSARP */
196}
197
198
199/*
200 * Convert a hardware address to an ASCII string.
201 */
202char *
203haddrtoa(u_char *haddr, int hlen)
204{
205	static char haddrbuf[3 * MAXHADDRLEN + 1];
206	char *bufptr;
207
208	if (hlen > MAXHADDRLEN)
209		hlen = MAXHADDRLEN;
210
211	bufptr = haddrbuf;
212	while (hlen > 0) {
213		sprintf(bufptr, "%02X:", (unsigned) (*haddr++ & 0xFF));
214		bufptr += 3;
215		hlen--;
216	}
217	bufptr[-1] = 0;
218	return (haddrbuf);
219}
220
221
222/*
223 * haddr_conv802()
224 * --------------
225 *
226 * Converts a backwards address to a canonical address and a canonical address
227 * to a backwards address.
228 *
229 * INPUTS:
230 *  adr_in - pointer to six byte string to convert (unsigned char *)
231 *  addr_len - how many bytes to convert
232 *
233 * OUTPUTS:
234 *  addr_out - The string is updated to contain the converted address.
235 *
236 * CALLER:
237 *  many
238 *
239 * DATA:
240 *  Uses conv802table to bit-reverse the address bytes.
241 */
242
243static u_char conv802table[256] =
244{
245	/* 0x00 */ 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
246	/* 0x08 */ 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
247	/* 0x10 */ 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
248	/* 0x18 */ 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
249	/* 0x20 */ 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
250	/* 0x28 */ 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
251	/* 0x30 */ 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
252	/* 0x38 */ 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
253	/* 0x40 */ 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
254	/* 0x48 */ 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
255	/* 0x50 */ 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
256	/* 0x58 */ 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
257	/* 0x60 */ 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
258	/* 0x68 */ 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
259	/* 0x70 */ 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
260	/* 0x78 */ 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
261	/* 0x80 */ 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
262	/* 0x88 */ 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
263	/* 0x90 */ 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
264	/* 0x98 */ 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
265	/* 0xA0 */ 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
266	/* 0xA8 */ 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
267	/* 0xB0 */ 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
268	/* 0xB8 */ 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
269	/* 0xC0 */ 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
270	/* 0xC8 */ 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
271	/* 0xD0 */ 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
272	/* 0xD8 */ 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
273	/* 0xE0 */ 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
274	/* 0xE8 */ 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
275	/* 0xF0 */ 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
276	/* 0xF8 */ 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF,
277};
278
279void
280haddr_conv802(u_char *addr_in, u_char *addr_out, int len)
281{
282	u_char *lim;
283
284	lim = addr_out + len;
285	while (addr_out < lim)
286		*addr_out++ = conv802table[*addr_in++];
287}
288
289#if 0
290/*
291 * For the record, here is a program to generate the
292 * bit-reverse table above.
293 */
294static int
295bitrev(int n)
296{
297	int i, r;
298
299	r = 0;
300	for (i = 0; i < 8; i++) {
301		r <<= 1;
302		r |= (n & 1);
303		n >>= 1;
304	}
305	return r;
306}
307
308void
309main(void)
310{
311	int i;
312	for (i = 0; i <= 0xFF; i++) {
313		if ((i & 7) == 0)
314			printf("/* 0x%02X */", i);
315		printf(" 0x%02X,", bitrev(i));
316		if ((i & 7) == 7)
317			printf("\n");
318	}
319}
320
321#endif
322
323/*
324 * Local Variables:
325 * tab-width: 4
326 * c-indent-level: 4
327 * c-argdecl-indent: 4
328 * c-continued-statement-offset: 4
329 * c-continued-brace-offset: -4
330 * c-label-offset: -4
331 * c-brace-offset: 0
332 * End:
333 */
334